fs/ext4/super.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/ext4/super.c
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/fs/minix/inode.c
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  *
  16  *  Big-endian to little-endian byte-swapping/bitmaps by
  17  *        David S. Miller (davem@caip.rutgers.edu), 1995
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/string.h>
  22 #include <linux/fs.h>
  23 #include <linux/time.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/slab.h>
  26 #include <linux/init.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/backing-dev.h>
  29 #include <linux/parser.h>
  30 #include <linux/buffer_head.h>
  31 #include <linux/exportfs.h>
  32 #include <linux/vfs.h>
  33 #include <linux/random.h>
  34 #include <linux/mount.h>
  35 #include <linux/namei.h>
  36 #include <linux/quotaops.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/ctype.h>
  39 #include <linux/log2.h>
  40 #include <linux/crc16.h>
  41 #include <linux/dax.h>
  42 #include <linux/uaccess.h>
  43 #include <linux/iversion.h>
  44 #include <linux/unicode.h>
  45 #include <linux/part_stat.h>
  46 #include <linux/kthread.h>
  47 #include <linux/freezer.h>
  48 #include <linux/fsnotify.h>
  49 #include <linux/fs_context.h>
  50 #include <linux/fs_parser.h>
  51
  52 #include "ext4.h"
  53 #include "ext4_extents.h"       /* Needed for trace points definition */
  54 #include "ext4_jbd2.h"
  55 #include "xattr.h"
  56 #include "acl.h"
  57 #include "mballoc.h"
  58 #include "fsmap.h"
  59
  60 #define CREATE_TRACE_POINTS
  61 #include <trace/events/ext4.h>
  62
  63 static struct ext4_lazy_init *ext4_li_info;
  64 static DEFINE_MUTEX(ext4_li_mtx);
  65 static struct ratelimit_state ext4_mount_msg_ratelimit;
  66
  67 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
  68                              unsigned long journal_devnum);
  69 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
  70 static void ext4_update_super(struct super_block *sb);
  71 static int ext4_commit_super(struct super_block *sb);
  72 static int ext4_mark_recovery_complete(struct super_block *sb,
  73                                         struct ext4_super_block *es);
  74 static int ext4_clear_journal_err(struct super_block *sb,
  75                                   struct ext4_super_block *es);
  76 static int ext4_sync_fs(struct super_block *sb, int wait);
  77 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
  78 static int ext4_unfreeze(struct super_block *sb);
  79 static int ext4_freeze(struct super_block *sb);
  80 static inline int ext2_feature_set_ok(struct super_block *sb);
  81 static inline int ext3_feature_set_ok(struct super_block *sb);
  82 static void ext4_destroy_lazyinit_thread(void);
  83 static void ext4_unregister_li_request(struct super_block *sb);
  84 static void ext4_clear_request_list(void);
  85 static struct inode *ext4_get_journal_inode(struct super_block *sb,
  86                                             unsigned int journal_inum);
  87 static int ext4_validate_options(struct fs_context *fc);
  88 static int ext4_check_opt_consistency(struct fs_context *fc,
  89                                       struct super_block *sb);
  90 static void ext4_apply_options(struct fs_context *fc, struct super_block *sb);
  91 static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param);
  92 static int ext4_get_tree(struct fs_context *fc);
  93 static int ext4_reconfigure(struct fs_context *fc);
  94 static void ext4_fc_free(struct fs_context *fc);
  95 static int ext4_init_fs_context(struct fs_context *fc);
  96 static const struct fs_parameter_spec ext4_param_specs[];
  97
  98 /*
  99  * Lock ordering
 100  *
 101  * page fault path:
 102  * mmap_lock -> sb_start_pagefault -> invalidate_lock (r) -> transaction start
 103  *   -> page lock -> i_data_sem (rw)
 104  *
 105  * buffered write path:
 106  * sb_start_write -> i_mutex -> mmap_lock
 107  * sb_start_write -> i_mutex -> transaction start -> page lock ->
 108  *   i_data_sem (rw)
 109  *
 110  * truncate:
 111  * sb_start_write -> i_mutex -> invalidate_lock (w) -> i_mmap_rwsem (w) ->
 112  *   page lock
 113  * sb_start_write -> i_mutex -> invalidate_lock (w) -> transaction start ->
 114  *   i_data_sem (rw)
 115  *
 116  * direct IO:
 117  * sb_start_write -> i_mutex -> mmap_lock
 118  * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
 119  *
 120  * writepages:
 121  * transaction start -> page lock(s) -> i_data_sem (rw)
 122  */
 123
 124 static const struct fs_context_operations ext4_context_ops = {
 125         .parse_param    = ext4_parse_param,
 126         .get_tree       = ext4_get_tree,
 127         .reconfigure    = ext4_reconfigure,
 128         .free           = ext4_fc_free,
 129 };
 130
 131
 132 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
 133 static struct file_system_type ext2_fs_type = {
 134         .owner                  = THIS_MODULE,
 135         .name                   = "ext2",
 136         .init_fs_context        = ext4_init_fs_context,
 137         .parameters             = ext4_param_specs,
 138         .kill_sb                = kill_block_super,
 139         .fs_flags               = FS_REQUIRES_DEV,
 140 };
 141 MODULE_ALIAS_FS("ext2");
 142 MODULE_ALIAS("ext2");
 143 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
 144 #else
 145 #define IS_EXT2_SB(sb) (0)
 146 #endif
 147
 148
 149 static struct file_system_type ext3_fs_type = {
 150         .owner                  = THIS_MODULE,
 151         .name                   = "ext3",
 152         .init_fs_context        = ext4_init_fs_context,
 153         .parameters             = ext4_param_specs,
 154         .kill_sb                = kill_block_super,
 155         .fs_flags               = FS_REQUIRES_DEV,
 156 };
 157 MODULE_ALIAS_FS("ext3");
 158 MODULE_ALIAS("ext3");
 159 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
 160
 161
 162 static inline void __ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
 163                                   bh_end_io_t *end_io)
 164 {
 165         /*
 166          * buffer's verified bit is no longer valid after reading from
 167          * disk again due to write out error, clear it to make sure we
 168          * recheck the buffer contents.
 169          */
 170         clear_buffer_verified(bh);
 171
 172         bh->b_end_io = end_io ? end_io : end_buffer_read_sync;
 173         get_bh(bh);
 174         submit_bh(REQ_OP_READ | op_flags, bh);
 175 }
 176
 177 void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
 178                          bh_end_io_t *end_io)
 179 {
 180         BUG_ON(!buffer_locked(bh));
 181
 182         if (ext4_buffer_uptodate(bh)) {
 183                 unlock_buffer(bh);
 184                 return;
 185         }
 186         __ext4_read_bh(bh, op_flags, end_io);
 187 }
 188
 189 int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, bh_end_io_t *end_io)
 190 {
 191         BUG_ON(!buffer_locked(bh));
 192
 193         if (ext4_buffer_uptodate(bh)) {
 194                 unlock_buffer(bh);
 195                 return 0;
 196         }
 197
 198         __ext4_read_bh(bh, op_flags, end_io);
 199
 200         wait_on_buffer(bh);
 201         if (buffer_uptodate(bh))
 202                 return 0;
 203         return -EIO;
 204 }
 205
 206 int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait)
 207 {
 208         lock_buffer(bh);
 209         if (!wait) {
 210                 ext4_read_bh_nowait(bh, op_flags, NULL);
 211                 return 0;
 212         }
 213         return ext4_read_bh(bh, op_flags, NULL);
 214 }
 215
 216 /*
 217  * This works like __bread_gfp() except it uses ERR_PTR for error
 218  * returns.  Currently with sb_bread it's impossible to distinguish
 219  * between ENOMEM and EIO situations (since both result in a NULL
 220  * return.
 221  */
 222 static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
 223                                                sector_t block,
 224                                                blk_opf_t op_flags, gfp_t gfp)
 225 {
 226         struct buffer_head *bh;
 227         int ret;
 228
 229         bh = sb_getblk_gfp(sb, block, gfp);
 230         if (bh == NULL)
 231                 return ERR_PTR(-ENOMEM);
 232         if (ext4_buffer_uptodate(bh))
 233                 return bh;
 234
 235         ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);
 236         if (ret) {
 237                 put_bh(bh);
 238                 return ERR_PTR(ret);
 239         }
 240         return bh;
 241 }
 242
 243 struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
 244                                    blk_opf_t op_flags)
 245 {
 246         return __ext4_sb_bread_gfp(sb, block, op_flags, __GFP_MOVABLE);
 247 }
 248
 249 struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
 250                                             sector_t block)
 251 {
 252         return __ext4_sb_bread_gfp(sb, block, 0, 0);
 253 }
 254
 255 void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
 256 {
 257         struct buffer_head *bh = sb_getblk_gfp(sb, block, 0);
 258
 259         if (likely(bh)) {
 260                 if (trylock_buffer(bh))
 261                         ext4_read_bh_nowait(bh, REQ_RAHEAD, NULL);
 262                 brelse(bh);
 263         }
 264 }
 265
 266 static int ext4_verify_csum_type(struct super_block *sb,
 267                                  struct ext4_super_block *es)
 268 {
 269         if (!ext4_has_feature_metadata_csum(sb))
 270                 return 1;
 271
 272         return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
 273 }
 274
 275 __le32 ext4_superblock_csum(struct super_block *sb,
 276                             struct ext4_super_block *es)
 277 {
 278         struct ext4_sb_info *sbi = EXT4_SB(sb);
 279         int offset = offsetof(struct ext4_super_block, s_checksum);
 280         __u32 csum;
 281
 282         csum = ext4_chksum(sbi, ~0, (char *)es, offset);
 283
 284         return cpu_to_le32(csum);
 285 }
 286
 287 static int ext4_superblock_csum_verify(struct super_block *sb,
 288                                        struct ext4_super_block *es)
 289 {
 290         if (!ext4_has_metadata_csum(sb))
 291                 return 1;
 292
 293         return es->s_checksum == ext4_superblock_csum(sb, es);
 294 }
 295
 296 void ext4_superblock_csum_set(struct super_block *sb)
 297 {
 298         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 299
 300         if (!ext4_has_metadata_csum(sb))
 301                 return;
 302
 303         es->s_checksum = ext4_superblock_csum(sb, es);
 304 }
 305
 306 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
 307                                struct ext4_group_desc *bg)
 308 {
 309         return le32_to_cpu(bg->bg_block_bitmap_lo) |
 310                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 311                  (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
 312 }
 313
 314 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 315                                struct ext4_group_desc *bg)
 316 {
 317         return le32_to_cpu(bg->bg_inode_bitmap_lo) |
 318                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 319                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
 320 }
 321
 322 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
 323                               struct ext4_group_desc *bg)
 324 {
 325         return le32_to_cpu(bg->bg_inode_table_lo) |
 326                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 327                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
 328 }
 329
 330 __u32 ext4_free_group_clusters(struct super_block *sb,
 331                                struct ext4_group_desc *bg)
 332 {
 333         return le16_to_cpu(bg->bg_free_blocks_count_lo) |
 334                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 335                  (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
 336 }
 337
 338 __u32 ext4_free_inodes_count(struct super_block *sb,
 339                               struct ext4_group_desc *bg)
 340 {
 341         return le16_to_cpu(bg->bg_free_inodes_count_lo) |
 342                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 343                  (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
 344 }
 345
 346 __u32 ext4_used_dirs_count(struct super_block *sb,
 347                               struct ext4_group_desc *bg)
 348 {
 349         return le16_to_cpu(bg->bg_used_dirs_count_lo) |
 350                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 351                  (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
 352 }
 353
 354 __u32 ext4_itable_unused_count(struct super_block *sb,
 355                               struct ext4_group_desc *bg)
 356 {
 357         return le16_to_cpu(bg->bg_itable_unused_lo) |
 358                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 359                  (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
 360 }
 361
 362 void ext4_block_bitmap_set(struct super_block *sb,
 363                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 364 {
 365         bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
 366         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 367                 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
 368 }
 369
 370 void ext4_inode_bitmap_set(struct super_block *sb,
 371                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 372 {
 373         bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
 374         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 375                 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
 376 }
 377
 378 void ext4_inode_table_set(struct super_block *sb,
 379                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
 380 {
 381         bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
 382         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 383                 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
 384 }
 385
 386 void ext4_free_group_clusters_set(struct super_block *sb,
 387                                   struct ext4_group_desc *bg, __u32 count)
 388 {
 389         bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
 390         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 391                 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
 392 }
 393
 394 void ext4_free_inodes_set(struct super_block *sb,
 395                           struct ext4_group_desc *bg, __u32 count)
 396 {
 397         bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
 398         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 399                 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
 400 }
 401
 402 void ext4_used_dirs_set(struct super_block *sb,
 403                           struct ext4_group_desc *bg, __u32 count)
 404 {
 405         bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
 406         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 407                 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
 408 }
 409
 410 void ext4_itable_unused_set(struct super_block *sb,
 411                           struct ext4_group_desc *bg, __u32 count)
 412 {
 413         bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
 414         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 415                 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
 416 }
 417
 418 static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now)
 419 {
 420         now = clamp_val(now, 0, (1ull << 40) - 1);
 421
 422         *lo = cpu_to_le32(lower_32_bits(now));
 423         *hi = upper_32_bits(now);
 424 }
 425
 426 static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
 427 {
 428         return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
 429 }
 430 #define ext4_update_tstamp(es, tstamp) \
 431         __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \
 432                              ktime_get_real_seconds())
 433 #define ext4_get_tstamp(es, tstamp) \
 434         __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
 435
 436 /*
 437  * The del_gendisk() function uninitializes the disk-specific data
 438  * structures, including the bdi structure, without telling anyone
 439  * else.  Once this happens, any attempt to call mark_buffer_dirty()
 440  * (for example, by ext4_commit_super), will cause a kernel OOPS.
 441  * This is a kludge to prevent these oops until we can put in a proper
 442  * hook in del_gendisk() to inform the VFS and file system layers.
 443  */
 444 static int block_device_ejected(struct super_block *sb)
 445 {
 446         struct inode *bd_inode = sb->s_bdev->bd_inode;
 447         struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
 448
 449         return bdi->dev == NULL;
 450 }
 451
 452 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
 453 {
 454         struct super_block              *sb = journal->j_private;
 455         struct ext4_sb_info             *sbi = EXT4_SB(sb);
 456         int                             error = is_journal_aborted(journal);
 457         struct ext4_journal_cb_entry    *jce;
 458
 459         BUG_ON(txn->t_state == T_FINISHED);
 460
 461         ext4_process_freed_data(sb, txn->t_tid);
 462
 463         spin_lock(&sbi->s_md_lock);
 464         while (!list_empty(&txn->t_private_list)) {
 465                 jce = list_entry(txn->t_private_list.next,
 466                                  struct ext4_journal_cb_entry, jce_list);
 467                 list_del_init(&jce->jce_list);
 468                 spin_unlock(&sbi->s_md_lock);
 469                 jce->jce_func(sb, jce, error);
 470                 spin_lock(&sbi->s_md_lock);
 471         }
 472         spin_unlock(&sbi->s_md_lock);
 473 }
 474
 475 /*
 476  * This writepage callback for write_cache_pages()
 477  * takes care of a few cases after page cleaning.
 478  *
 479  * write_cache_pages() already checks for dirty pages
 480  * and calls clear_page_dirty_for_io(), which we want,
 481  * to write protect the pages.
 482  *
 483  * However, we may have to redirty a page (see below.)
 484  */
 485 static int ext4_journalled_writepage_callback(struct folio *folio,
 486                                               struct writeback_control *wbc,
 487                                               void *data)
 488 {
 489         transaction_t *transaction = (transaction_t *) data;
 490         struct buffer_head *bh, *head;
 491         struct journal_head *jh;
 492
 493         bh = head = folio_buffers(folio);
 494         do {
 495                 /*
 496                  * We have to redirty a page in these cases:
 497                  * 1) If buffer is dirty, it means the page was dirty because it
 498                  * contains a buffer that needs checkpointing. So the dirty bit
 499                  * needs to be preserved so that checkpointing writes the buffer
 500                  * properly.
 501                  * 2) If buffer is not part of the committing transaction
 502                  * (we may have just accidentally come across this buffer because
 503                  * inode range tracking is not exact) or if the currently running
 504                  * transaction already contains this buffer as well, dirty bit
 505                  * needs to be preserved so that the buffer gets writeprotected
 506                  * properly on running transaction's commit.
 507                  */
 508                 jh = bh2jh(bh);
 509                 if (buffer_dirty(bh) ||
 510                     (jh && (jh->b_transaction != transaction ||
 511                             jh->b_next_transaction))) {
 512                         folio_redirty_for_writepage(wbc, folio);
 513                         goto out;
 514                 }
 515         } while ((bh = bh->b_this_page) != head);
 516
 517 out:
 518         return AOP_WRITEPAGE_ACTIVATE;
 519 }
 520
 521 static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)
 522 {
 523         struct address_space *mapping = jinode->i_vfs_inode->i_mapping;
 524         struct writeback_control wbc = {
 525                 .sync_mode =  WB_SYNC_ALL,
 526                 .nr_to_write = LONG_MAX,
 527                 .range_start = jinode->i_dirty_start,
 528                 .range_end = jinode->i_dirty_end,
 529         };
 530
 531         return write_cache_pages(mapping, &wbc,
 532                                  ext4_journalled_writepage_callback,
 533                                  jinode->i_transaction);
 534 }
 535
 536 static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
 537 {
 538         int ret;
 539
 540         if (ext4_should_journal_data(jinode->i_vfs_inode))
 541                 ret = ext4_journalled_submit_inode_data_buffers(jinode);
 542         else
 543                 ret = ext4_normal_submit_inode_data_buffers(jinode);
 544         return ret;
 545 }
 546
 547 static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode)
 548 {
 549         int ret = 0;
 550
 551         if (!ext4_should_journal_data(jinode->i_vfs_inode))
 552                 ret = jbd2_journal_finish_inode_data_buffers(jinode);
 553
 554         return ret;
 555 }
 556
 557 static bool system_going_down(void)
 558 {
 559         return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
 560                 || system_state == SYSTEM_RESTART;
 561 }
 562
 563 struct ext4_err_translation {
 564         int code;
 565         int errno;
 566 };
 567
 568 #define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err }
 569
 570 static struct ext4_err_translation err_translation[] = {
 571         EXT4_ERR_TRANSLATE(EIO),
 572         EXT4_ERR_TRANSLATE(ENOMEM),
 573         EXT4_ERR_TRANSLATE(EFSBADCRC),
 574         EXT4_ERR_TRANSLATE(EFSCORRUPTED),
 575         EXT4_ERR_TRANSLATE(ENOSPC),
 576         EXT4_ERR_TRANSLATE(ENOKEY),
 577         EXT4_ERR_TRANSLATE(EROFS),
 578         EXT4_ERR_TRANSLATE(EFBIG),
 579         EXT4_ERR_TRANSLATE(EEXIST),
 580         EXT4_ERR_TRANSLATE(ERANGE),
 581         EXT4_ERR_TRANSLATE(EOVERFLOW),
 582         EXT4_ERR_TRANSLATE(EBUSY),
 583         EXT4_ERR_TRANSLATE(ENOTDIR),
 584         EXT4_ERR_TRANSLATE(ENOTEMPTY),
 585         EXT4_ERR_TRANSLATE(ESHUTDOWN),
 586         EXT4_ERR_TRANSLATE(EFAULT),
 587 };
 588
 589 static int ext4_errno_to_code(int errno)
 590 {
 591         int i;
 592
 593         for (i = 0; i < ARRAY_SIZE(err_translation); i++)
 594                 if (err_translation[i].errno == errno)
 595                         return err_translation[i].code;
 596         return EXT4_ERR_UNKNOWN;
 597 }
 598
 599 static void save_error_info(struct super_block *sb, int error,
 600                             __u32 ino, __u64 block,
 601                             const char *func, unsigned int line)
 602 {
 603         struct ext4_sb_info *sbi = EXT4_SB(sb);
 604
 605         /* We default to EFSCORRUPTED error... */
 606         if (error == 0)
 607                 error = EFSCORRUPTED;
 608
 609         spin_lock(&sbi->s_error_lock);
 610         sbi->s_add_error_count++;
 611         sbi->s_last_error_code = error;
 612         sbi->s_last_error_line = line;
 613         sbi->s_last_error_ino = ino;
 614         sbi->s_last_error_block = block;
 615         sbi->s_last_error_func = func;
 616         sbi->s_last_error_time = ktime_get_real_seconds();
 617         if (!sbi->s_first_error_time) {
 618                 sbi->s_first_error_code = error;
 619                 sbi->s_first_error_line = line;
 620                 sbi->s_first_error_ino = ino;
 621                 sbi->s_first_error_block = block;
 622                 sbi->s_first_error_func = func;
 623                 sbi->s_first_error_time = sbi->s_last_error_time;
 624         }
 625         spin_unlock(&sbi->s_error_lock);
 626 }
 627
 628 /* Deal with the reporting of failure conditions on a filesystem such as
 629  * inconsistencies detected or read IO failures.
 630  *
 631  * On ext2, we can store the error state of the filesystem in the
 632  * superblock.  That is not possible on ext4, because we may have other
 633  * write ordering constraints on the superblock which prevent us from
 634  * writing it out straight away; and given that the journal is about to
 635  * be aborted, we can't rely on the current, or future, transactions to
 636  * write out the superblock safely.
 637  *
 638  * We'll just use the jbd2_journal_abort() error code to record an error in
 639  * the journal instead.  On recovery, the journal will complain about
 640  * that error until we've noted it down and cleared it.
 641  *
 642  * If force_ro is set, we unconditionally force the filesystem into an
 643  * ABORT|READONLY state, unless the error response on the fs has been set to
 644  * panic in which case we take the easy way out and panic immediately. This is
 645  * used to deal with unrecoverable failures such as journal IO errors or ENOMEM
 646  * at a critical moment in log management.
 647  */
 648 static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,
 649                               __u32 ino, __u64 block,
 650                               const char *func, unsigned int line)
 651 {
 652         journal_t *journal = EXT4_SB(sb)->s_journal;
 653         bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT);
 654
 655         EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
 656         if (test_opt(sb, WARN_ON_ERROR))
 657                 WARN_ON_ONCE(1);
 658
 659         if (!continue_fs && !sb_rdonly(sb)) {
 660                 ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
 661                 if (journal)
 662                         jbd2_journal_abort(journal, -EIO);
 663         }
 664
 665         if (!bdev_read_only(sb->s_bdev)) {
 666                 save_error_info(sb, error, ino, block, func, line);
 667                 /*
 668                  * In case the fs should keep running, we need to writeout
 669                  * superblock through the journal. Due to lock ordering
 670                  * constraints, it may not be safe to do it right here so we
 671                  * defer superblock flushing to a workqueue.
 672                  */
 673                 if (continue_fs && journal)
 674                         schedule_work(&EXT4_SB(sb)->s_error_work);
 675                 else
 676                         ext4_commit_super(sb);
 677         }
 678
 679         /*
 680          * We force ERRORS_RO behavior when system is rebooting. Otherwise we
 681          * could panic during 'reboot -f' as the underlying device got already
 682          * disabled.
 683          */
 684         if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
 685                 panic("EXT4-fs (device %s): panic forced after error\n",
 686                         sb->s_id);
 687         }
 688
 689         if (sb_rdonly(sb) || continue_fs)
 690                 return;
 691
 692         ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
 693         /*
 694          * Make sure updated value of ->s_mount_flags will be visible before
 695          * ->s_flags update
 696          */
 697         smp_wmb();
 698         sb->s_flags |= SB_RDONLY;
 699 }
 700
 701 static void flush_stashed_error_work(struct work_struct *work)
 702 {
 703         struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info,
 704                                                 s_error_work);
 705         journal_t *journal = sbi->s_journal;
 706         handle_t *handle;
 707
 708         /*
 709          * If the journal is still running, we have to write out superblock
 710          * through the journal to avoid collisions of other journalled sb
 711          * updates.
 712          *
 713          * We use directly jbd2 functions here to avoid recursing back into
 714          * ext4 error handling code during handling of previous errors.
 715          */
 716         if (!sb_rdonly(sbi->s_sb) && journal) {
 717                 struct buffer_head *sbh = sbi->s_sbh;
 718                 handle = jbd2_journal_start(journal, 1);
 719                 if (IS_ERR(handle))
 720                         goto write_directly;
 721                 if (jbd2_journal_get_write_access(handle, sbh)) {
 722                         jbd2_journal_stop(handle);
 723                         goto write_directly;
 724                 }
 725                 ext4_update_super(sbi->s_sb);
 726                 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
 727                         ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
 728                                  "superblock detected");
 729                         clear_buffer_write_io_error(sbh);
 730                         set_buffer_uptodate(sbh);
 731                 }
 732
 733                 if (jbd2_journal_dirty_metadata(handle, sbh)) {
 734                         jbd2_journal_stop(handle);
 735                         goto write_directly;
 736                 }
 737                 jbd2_journal_stop(handle);
 738                 ext4_notify_error_sysfs(sbi);
 739                 return;
 740         }
 741 write_directly:
 742         /*
 743          * Write through journal failed. Write sb directly to get error info
 744          * out and hope for the best.
 745          */
 746         ext4_commit_super(sbi->s_sb);
 747         ext4_notify_error_sysfs(sbi);
 748 }
 749
 750 #define ext4_error_ratelimit(sb)                                        \
 751                 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),     \
 752                              "EXT4-fs error")
 753
 754 void __ext4_error(struct super_block *sb, const char *function,
 755                   unsigned int line, bool force_ro, int error, __u64 block,
 756                   const char *fmt, ...)
 757 {
 758         struct va_format vaf;
 759         va_list args;
 760
 761         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 762                 return;
 763
 764         trace_ext4_error(sb, function, line);
 765         if (ext4_error_ratelimit(sb)) {
 766                 va_start(args, fmt);
 767                 vaf.fmt = fmt;
 768                 vaf.va = &args;
 769                 printk(KERN_CRIT
 770                        "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
 771                        sb->s_id, function, line, current->comm, &vaf);
 772                 va_end(args);
 773         }
 774         fsnotify_sb_error(sb, NULL, error ? error : EFSCORRUPTED);
 775
 776         ext4_handle_error(sb, force_ro, error, 0, block, function, line);
 777 }
 778
 779 void __ext4_error_inode(struct inode *inode, const char *function,
 780                         unsigned int line, ext4_fsblk_t block, int error,
 781                         const char *fmt, ...)
 782 {
 783         va_list args;
 784         struct va_format vaf;
 785
 786         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 787                 return;
 788
 789         trace_ext4_error(inode->i_sb, function, line);
 790         if (ext4_error_ratelimit(inode->i_sb)) {
 791                 va_start(args, fmt);
 792                 vaf.fmt = fmt;
 793                 vaf.va = &args;
 794                 if (block)
 795                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 796                                "inode #%lu: block %llu: comm %s: %pV\n",
 797                                inode->i_sb->s_id, function, line, inode->i_ino,
 798                                block, current->comm, &vaf);
 799                 else
 800                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 801                                "inode #%lu: comm %s: %pV\n",
 802                                inode->i_sb->s_id, function, line, inode->i_ino,
 803                                current->comm, &vaf);
 804                 va_end(args);
 805         }
 806         fsnotify_sb_error(inode->i_sb, inode, error ? error : EFSCORRUPTED);
 807
 808         ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block,
 809                           function, line);
 810 }
 811
 812 void __ext4_error_file(struct file *file, const char *function,
 813                        unsigned int line, ext4_fsblk_t block,
 814                        const char *fmt, ...)
 815 {
 816         va_list args;
 817         struct va_format vaf;
 818         struct inode *inode = file_inode(file);
 819         char pathname[80], *path;
 820
 821         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 822                 return;
 823
 824         trace_ext4_error(inode->i_sb, function, line);
 825         if (ext4_error_ratelimit(inode->i_sb)) {
 826                 path = file_path(file, pathname, sizeof(pathname));
 827                 if (IS_ERR(path))
 828                         path = "(unknown)";
 829                 va_start(args, fmt);
 830                 vaf.fmt = fmt;
 831                 vaf.va = &args;
 832                 if (block)
 833                         printk(KERN_CRIT
 834                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 835                                "block %llu: comm %s: path %s: %pV\n",
 836                                inode->i_sb->s_id, function, line, inode->i_ino,
 837                                block, current->comm, path, &vaf);
 838                 else
 839                         printk(KERN_CRIT
 840                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 841                                "comm %s: path %s: %pV\n",
 842                                inode->i_sb->s_id, function, line, inode->i_ino,
 843                                current->comm, path, &vaf);
 844                 va_end(args);
 845         }
 846         fsnotify_sb_error(inode->i_sb, inode, EFSCORRUPTED);
 847
 848         ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block,
 849                           function, line);
 850 }
 851
 852 const char *ext4_decode_error(struct super_block *sb, int errno,
 853                               char nbuf[16])
 854 {
 855         char *errstr = NULL;
 856
 857         switch (errno) {
 858         case -EFSCORRUPTED:
 859                 errstr = "Corrupt filesystem";
 860                 break;
 861         case -EFSBADCRC:
 862                 errstr = "Filesystem failed CRC";
 863                 break;
 864         case -EIO:
 865                 errstr = "IO failure";
 866                 break;
 867         case -ENOMEM:
 868                 errstr = "Out of memory";
 869                 break;
 870         case -EROFS:
 871                 if (!sb || (EXT4_SB(sb)->s_journal &&
 872                             EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
 873                         errstr = "Journal has aborted";
 874                 else
 875                         errstr = "Readonly filesystem";
 876                 break;
 877         default:
 878                 /* If the caller passed in an extra buffer for unknown
 879                  * errors, textualise them now.  Else we just return
 880                  * NULL. */
 881                 if (nbuf) {
 882                         /* Check for truncated error codes... */
 883                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 884                                 errstr = nbuf;
 885                 }
 886                 break;
 887         }
 888
 889         return errstr;
 890 }
 891
 892 /* __ext4_std_error decodes expected errors from journaling functions
 893  * automatically and invokes the appropriate error response.  */
 894
 895 void __ext4_std_error(struct super_block *sb, const char *function,
 896                       unsigned int line, int errno)
 897 {
 898         char nbuf[16];
 899         const char *errstr;
 900
 901         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 902                 return;
 903
 904         /* Special case: if the error is EROFS, and we're not already
 905          * inside a transaction, then there's really no point in logging
 906          * an error. */
 907         if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
 908                 return;
 909
 910         if (ext4_error_ratelimit(sb)) {
 911                 errstr = ext4_decode_error(sb, errno, nbuf);
 912                 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
 913                        sb->s_id, function, line, errstr);
 914         }
 915         fsnotify_sb_error(sb, NULL, errno ? errno : EFSCORRUPTED);
 916
 917         ext4_handle_error(sb, false, -errno, 0, 0, function, line);
 918 }
 919
 920 void __ext4_msg(struct super_block *sb,
 921                 const char *prefix, const char *fmt, ...)
 922 {
 923         struct va_format vaf;
 924         va_list args;
 925
 926         if (sb) {
 927                 atomic_inc(&EXT4_SB(sb)->s_msg_count);
 928                 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state),
 929                                   "EXT4-fs"))
 930                         return;
 931         }
 932
 933         va_start(args, fmt);
 934         vaf.fmt = fmt;
 935         vaf.va = &args;
 936         if (sb)
 937                 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
 938         else
 939                 printk("%sEXT4-fs: %pV\n", prefix, &vaf);
 940         va_end(args);
 941 }
 942
 943 static int ext4_warning_ratelimit(struct super_block *sb)
 944 {
 945         atomic_inc(&EXT4_SB(sb)->s_warning_count);
 946         return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
 947                             "EXT4-fs warning");
 948 }
 949
 950 void __ext4_warning(struct super_block *sb, const char *function,
 951                     unsigned int line, const char *fmt, ...)
 952 {
 953         struct va_format vaf;
 954         va_list args;
 955
 956         if (!ext4_warning_ratelimit(sb))
 957                 return;
 958
 959         va_start(args, fmt);
 960         vaf.fmt = fmt;
 961         vaf.va = &args;
 962         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
 963                sb->s_id, function, line, &vaf);
 964         va_end(args);
 965 }
 966
 967 void __ext4_warning_inode(const struct inode *inode, const char *function,
 968                           unsigned int line, const char *fmt, ...)
 969 {
 970         struct va_format vaf;
 971         va_list args;
 972
 973         if (!ext4_warning_ratelimit(inode->i_sb))
 974                 return;
 975
 976         va_start(args, fmt);
 977         vaf.fmt = fmt;
 978         vaf.va = &args;
 979         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
 980                "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
 981                function, line, inode->i_ino, current->comm, &vaf);
 982         va_end(args);
 983 }
 984
 985 void __ext4_grp_locked_error(const char *function, unsigned int line,
 986                              struct super_block *sb, ext4_group_t grp,
 987                              unsigned long ino, ext4_fsblk_t block,
 988                              const char *fmt, ...)
 989 __releases(bitlock)
 990 __acquires(bitlock)
 991 {
 992         struct va_format vaf;
 993         va_list args;
 994
 995         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 996                 return;
 997
 998         trace_ext4_error(sb, function, line);
 999         if (ext4_error_ratelimit(sb)) {
1000                 va_start(args, fmt);
1001                 vaf.fmt = fmt;
1002                 vaf.va = &args;
1003                 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
1004                        sb->s_id, function, line, grp);
1005                 if (ino)
1006                         printk(KERN_CONT "inode %lu: ", ino);
1007                 if (block)
1008                         printk(KERN_CONT "block %llu:",
1009                                (unsigned long long) block);
1010                 printk(KERN_CONT "%pV\n", &vaf);
1011                 va_end(args);
1012         }
1013
1014         if (test_opt(sb, ERRORS_CONT)) {
1015                 if (test_opt(sb, WARN_ON_ERROR))
1016                         WARN_ON_ONCE(1);
1017                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1018                 if (!bdev_read_only(sb->s_bdev)) {
1019                         save_error_info(sb, EFSCORRUPTED, ino, block, function,
1020                                         line);
1021                         schedule_work(&EXT4_SB(sb)->s_error_work);
1022                 }
1023                 return;
1024         }
1025         ext4_unlock_group(sb, grp);
1026         ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line);
1027         /*
1028          * We only get here in the ERRORS_RO case; relocking the group
1029          * may be dangerous, but nothing bad will happen since the
1030          * filesystem will have already been marked read/only and the
1031          * journal has been aborted.  We return 1 as a hint to callers
1032          * who might what to use the return value from
1033          * ext4_grp_locked_error() to distinguish between the
1034          * ERRORS_CONT and ERRORS_RO case, and perhaps return more
1035          * aggressively from the ext4 function in question, with a
1036          * more appropriate error code.
1037          */
1038         ext4_lock_group(sb, grp);
1039         return;
1040 }
1041
1042 void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
1043                                      ext4_group_t group,
1044                                      unsigned int flags)
1045 {
1046         struct ext4_sb_info *sbi = EXT4_SB(sb);
1047         struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1048         struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
1049         int ret;
1050
1051         if (!grp || !gdp)
1052                 return;
1053         if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
1054                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
1055                                             &grp->bb_state);
1056                 if (!ret)
1057                         percpu_counter_sub(&sbi->s_freeclusters_counter,
1058                                            grp->bb_free);
1059         }
1060
1061         if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
1062                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
1063                                             &grp->bb_state);
1064                 if (!ret && gdp) {
1065                         int count;
1066
1067                         count = ext4_free_inodes_count(sb, gdp);
1068                         percpu_counter_sub(&sbi->s_freeinodes_counter,
1069                                            count);
1070                 }
1071         }
1072 }
1073
1074 void ext4_update_dynamic_rev(struct super_block *sb)
1075 {
1076         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1077
1078         if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
1079                 return;
1080
1081         ext4_warning(sb,
1082                      "updating to rev %d because of new feature flag, "
1083                      "running e2fsck is recommended",
1084                      EXT4_DYNAMIC_REV);
1085
1086         es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
1087         es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
1088         es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
1089         /* leave es->s_feature_*compat flags alone */
1090         /* es->s_uuid will be set by e2fsck if empty */
1091
1092         /*
1093          * The rest of the superblock fields should be zero, and if not it
1094          * means they are likely already in use, so leave them alone.  We
1095          * can leave it up to e2fsck to clean up any inconsistencies there.
1096          */
1097 }
1098
1099 static void ext4_bdev_mark_dead(struct block_device *bdev)
1100 {
1101         ext4_force_shutdown(bdev->bd_holder, EXT4_GOING_FLAGS_NOLOGFLUSH);
1102 }
1103
1104 static const struct blk_holder_ops ext4_holder_ops = {
1105         .mark_dead              = ext4_bdev_mark_dead,
1106 };
1107
1108 /*
1109  * Open the external journal device
1110  */
1111 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
1112 {
1113         struct block_device *bdev;
1114
1115         bdev = blkdev_get_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_WRITE, sb,
1116                                  &ext4_holder_ops);
1117         if (IS_ERR(bdev))
1118                 goto fail;
1119         return bdev;
1120
1121 fail:
1122         ext4_msg(sb, KERN_ERR,
1123                  "failed to open journal device unknown-block(%u,%u) %ld",
1124                  MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
1125         return NULL;
1126 }
1127
1128 /*
1129  * Release the journal device
1130  */
1131 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
1132 {
1133         struct block_device *bdev;
1134         bdev = sbi->s_journal_bdev;
1135         if (bdev) {
1136                 /*
1137                  * Invalidate the journal device's buffers.  We don't want them
1138                  * floating about in memory - the physical journal device may
1139                  * hotswapped, and it breaks the `ro-after' testing code.
1140                  */
1141                 invalidate_bdev(bdev);
1142                 blkdev_put(bdev, sbi->s_sb);
1143                 sbi->s_journal_bdev = NULL;
1144         }
1145 }
1146
1147 static inline struct inode *orphan_list_entry(struct list_head *l)
1148 {
1149         return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
1150 }
1151
1152 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
1153 {
1154         struct list_head *l;
1155
1156         ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
1157                  le32_to_cpu(sbi->s_es->s_last_orphan));
1158
1159         printk(KERN_ERR "sb_info orphan list:\n");
1160         list_for_each(l, &sbi->s_orphan) {
1161                 struct inode *inode = orphan_list_entry(l);
1162                 printk(KERN_ERR "  "
1163                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1164                        inode->i_sb->s_id, inode->i_ino, inode,
1165                        inode->i_mode, inode->i_nlink,
1166                        NEXT_ORPHAN(inode));
1167         }
1168 }
1169
1170 #ifdef CONFIG_QUOTA
1171 static int ext4_quota_off(struct super_block *sb, int type);
1172
1173 static inline void ext4_quotas_off(struct super_block *sb, int type)
1174 {
1175         BUG_ON(type > EXT4_MAXQUOTAS);
1176
1177         /* Use our quota_off function to clear inode flags etc. */
1178         for (type--; type >= 0; type--)
1179                 ext4_quota_off(sb, type);
1180 }
1181
1182 /*
1183  * This is a helper function which is used in the mount/remount
1184  * codepaths (which holds s_umount) to fetch the quota file name.
1185  */
1186 static inline char *get_qf_name(struct super_block *sb,
1187                                 struct ext4_sb_info *sbi,
1188                                 int type)
1189 {
1190         return rcu_dereference_protected(sbi->s_qf_names[type],
1191                                          lockdep_is_held(&sb->s_umount));
1192 }
1193 #else
1194 static inline void ext4_quotas_off(struct super_block *sb, int type)
1195 {
1196 }
1197 #endif
1198
1199 static int ext4_percpu_param_init(struct ext4_sb_info *sbi)
1200 {
1201         ext4_fsblk_t block;
1202         int err;
1203
1204         block = ext4_count_free_clusters(sbi->s_sb);
1205         ext4_free_blocks_count_set(sbi->s_es, EXT4_C2B(sbi, block));
1206         err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
1207                                   GFP_KERNEL);
1208         if (!err) {
1209                 unsigned long freei = ext4_count_free_inodes(sbi->s_sb);
1210                 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
1211                 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
1212                                           GFP_KERNEL);
1213         }
1214         if (!err)
1215                 err = percpu_counter_init(&sbi->s_dirs_counter,
1216                                           ext4_count_dirs(sbi->s_sb), GFP_KERNEL);
1217         if (!err)
1218                 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
1219                                           GFP_KERNEL);
1220         if (!err)
1221                 err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0,
1222                                           GFP_KERNEL);
1223         if (!err)
1224                 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
1225
1226         if (err)
1227                 ext4_msg(sbi->s_sb, KERN_ERR, "insufficient memory");
1228
1229         return err;
1230 }
1231
1232 static void ext4_percpu_param_destroy(struct ext4_sb_info *sbi)
1233 {
1234         percpu_counter_destroy(&sbi->s_freeclusters_counter);
1235         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1236         percpu_counter_destroy(&sbi->s_dirs_counter);
1237         percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1238         percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
1239         percpu_free_rwsem(&sbi->s_writepages_rwsem);
1240 }
1241
1242 static void ext4_group_desc_free(struct ext4_sb_info *sbi)
1243 {
1244         struct buffer_head **group_desc;
1245         int i;
1246
1247         rcu_read_lock();
1248         group_desc = rcu_dereference(sbi->s_group_desc);
1249         for (i = 0; i < sbi->s_gdb_count; i++)
1250                 brelse(group_desc[i]);
1251         kvfree(group_desc);
1252         rcu_read_unlock();
1253 }
1254
1255 static void ext4_flex_groups_free(struct ext4_sb_info *sbi)
1256 {
1257         struct flex_groups **flex_groups;
1258         int i;
1259
1260         rcu_read_lock();
1261         flex_groups = rcu_dereference(sbi->s_flex_groups);
1262         if (flex_groups) {
1263                 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1264                         kvfree(flex_groups[i]);
1265                 kvfree(flex_groups);
1266         }
1267         rcu_read_unlock();
1268 }
1269
1270 static void ext4_put_super(struct super_block *sb)
1271 {
1272         struct ext4_sb_info *sbi = EXT4_SB(sb);
1273         struct ext4_super_block *es = sbi->s_es;
1274         int aborted = 0;
1275         int err;
1276
1277         /*
1278          * Unregister sysfs before destroying jbd2 journal.
1279          * Since we could still access attr_journal_task attribute via sysfs
1280          * path which could have sbi->s_journal->j_task as NULL
1281          * Unregister sysfs before flush sbi->s_error_work.
1282          * Since user may read /proc/fs/ext4/xx/mb_groups during umount, If
1283          * read metadata verify failed then will queue error work.
1284          * flush_stashed_error_work will call start_this_handle may trigger
1285          * BUG_ON.
1286          */
1287         ext4_unregister_sysfs(sb);
1288
1289         if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs unmount"))
1290                 ext4_msg(sb, KERN_INFO, "unmounting filesystem %pU.",
1291                          &sb->s_uuid);
1292
1293         ext4_unregister_li_request(sb);
1294         ext4_quotas_off(sb, EXT4_MAXQUOTAS);
1295
1296         flush_work(&sbi->s_error_work);
1297         destroy_workqueue(sbi->rsv_conversion_wq);
1298         ext4_release_orphan_info(sb);
1299
1300         if (sbi->s_journal) {
1301                 aborted = is_journal_aborted(sbi->s_journal);
1302                 err = jbd2_journal_destroy(sbi->s_journal);
1303                 sbi->s_journal = NULL;
1304                 if ((err < 0) && !aborted) {
1305                         ext4_abort(sb, -err, "Couldn't clean up the journal");
1306                 }
1307         }
1308
1309         ext4_es_unregister_shrinker(sbi);
1310         timer_shutdown_sync(&sbi->s_err_report);
1311         ext4_release_system_zone(sb);
1312         ext4_mb_release(sb);
1313         ext4_ext_release(sb);
1314
1315         if (!sb_rdonly(sb) && !aborted) {
1316                 ext4_clear_feature_journal_needs_recovery(sb);
1317                 ext4_clear_feature_orphan_present(sb);
1318                 es->s_state = cpu_to_le16(sbi->s_mount_state);
1319         }
1320         if (!sb_rdonly(sb))
1321                 ext4_commit_super(sb);
1322
1323         ext4_group_desc_free(sbi);
1324         ext4_flex_groups_free(sbi);
1325         ext4_percpu_param_destroy(sbi);
1326 #ifdef CONFIG_QUOTA
1327         for (int i = 0; i < EXT4_MAXQUOTAS; i++)
1328                 kfree(get_qf_name(sb, sbi, i));
1329 #endif
1330
1331         /* Debugging code just in case the in-memory inode orphan list
1332          * isn't empty.  The on-disk one can be non-empty if we've
1333          * detected an error and taken the fs readonly, but the
1334          * in-memory list had better be clean by this point. */
1335         if (!list_empty(&sbi->s_orphan))
1336                 dump_orphan_list(sb, sbi);
1337         ASSERT(list_empty(&sbi->s_orphan));
1338
1339         sync_blockdev(sb->s_bdev);
1340         invalidate_bdev(sb->s_bdev);
1341         if (sbi->s_journal_bdev) {
1342                 sync_blockdev(sbi->s_journal_bdev);
1343                 ext4_blkdev_remove(sbi);
1344         }
1345
1346         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1347         sbi->s_ea_inode_cache = NULL;
1348
1349         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1350         sbi->s_ea_block_cache = NULL;
1351
1352         ext4_stop_mmpd(sbi);
1353
1354         brelse(sbi->s_sbh);
1355         sb->s_fs_info = NULL;
1356         /*
1357          * Now that we are completely done shutting down the
1358          * superblock, we need to actually destroy the kobject.
1359          */
1360         kobject_put(&sbi->s_kobj);
1361         wait_for_completion(&sbi->s_kobj_unregister);
1362         if (sbi->s_chksum_driver)
1363                 crypto_free_shash(sbi->s_chksum_driver);
1364         kfree(sbi->s_blockgroup_lock);
1365         fs_put_dax(sbi->s_daxdev, NULL);
1366         fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
1367 #if IS_ENABLED(CONFIG_UNICODE)
1368         utf8_unload(sb->s_encoding);
1369 #endif
1370         kfree(sbi);
1371 }
1372
1373 static struct kmem_cache *ext4_inode_cachep;
1374
1375 /*
1376  * Called inside transaction, so use GFP_NOFS
1377  */
1378 static struct inode *ext4_alloc_inode(struct super_block *sb)
1379 {
1380         struct ext4_inode_info *ei;
1381
1382         ei = alloc_inode_sb(sb, ext4_inode_cachep, GFP_NOFS);
1383         if (!ei)
1384                 return NULL;
1385
1386         inode_set_iversion(&ei->vfs_inode, 1);
1387         ei->i_flags = 0;
1388         spin_lock_init(&ei->i_raw_lock);
1389         ei->i_prealloc_node = RB_ROOT;
1390         atomic_set(&ei->i_prealloc_active, 0);
1391         rwlock_init(&ei->i_prealloc_lock);
1392         ext4_es_init_tree(&ei->i_es_tree);
1393         rwlock_init(&ei->i_es_lock);
1394         INIT_LIST_HEAD(&ei->i_es_list);
1395         ei->i_es_all_nr = 0;
1396         ei->i_es_shk_nr = 0;
1397         ei->i_es_shrink_lblk = 0;
1398         ei->i_reserved_data_blocks = 0;
1399         spin_lock_init(&(ei->i_block_reservation_lock));
1400         ext4_init_pending_tree(&ei->i_pending_tree);
1401 #ifdef CONFIG_QUOTA
1402         ei->i_reserved_quota = 0;
1403         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1404 #endif
1405         ei->jinode = NULL;
1406         INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1407         spin_lock_init(&ei->i_completed_io_lock);
1408         ei->i_sync_tid = 0;
1409         ei->i_datasync_tid = 0;
1410         atomic_set(&ei->i_unwritten, 0);
1411         INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1412         ext4_fc_init_inode(&ei->vfs_inode);
1413         mutex_init(&ei->i_fc_lock);
1414         return &ei->vfs_inode;
1415 }
1416
1417 static int ext4_drop_inode(struct inode *inode)
1418 {
1419         int drop = generic_drop_inode(inode);
1420
1421         if (!drop)
1422                 drop = fscrypt_drop_inode(inode);
1423
1424         trace_ext4_drop_inode(inode, drop);
1425         return drop;
1426 }
1427
1428 static void ext4_free_in_core_inode(struct inode *inode)
1429 {
1430         fscrypt_free_inode(inode);
1431         if (!list_empty(&(EXT4_I(inode)->i_fc_list))) {
1432                 pr_warn("%s: inode %ld still in fc list",
1433                         __func__, inode->i_ino);
1434         }
1435         kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1436 }
1437
1438 static void ext4_destroy_inode(struct inode *inode)
1439 {
1440         if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1441                 ext4_msg(inode->i_sb, KERN_ERR,
1442                          "Inode %lu (%p): orphan list check failed!",
1443                          inode->i_ino, EXT4_I(inode));
1444                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1445                                 EXT4_I(inode), sizeof(struct ext4_inode_info),
1446                                 true);
1447                 dump_stack();
1448         }
1449
1450         if (EXT4_I(inode)->i_reserved_data_blocks)
1451                 ext4_msg(inode->i_sb, KERN_ERR,
1452                          "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",
1453                          inode->i_ino, EXT4_I(inode),
1454                          EXT4_I(inode)->i_reserved_data_blocks);
1455 }
1456
1457 static void ext4_shutdown(struct super_block *sb)
1458 {
1459        ext4_force_shutdown(sb, EXT4_GOING_FLAGS_NOLOGFLUSH);
1460 }
1461
1462 static void init_once(void *foo)
1463 {
1464         struct ext4_inode_info *ei = foo;
1465
1466         INIT_LIST_HEAD(&ei->i_orphan);
1467         init_rwsem(&ei->xattr_sem);
1468         init_rwsem(&ei->i_data_sem);
1469         inode_init_once(&ei->vfs_inode);
1470         ext4_fc_init_inode(&ei->vfs_inode);
1471 }
1472
1473 static int __init init_inodecache(void)
1474 {
1475         ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1476                                 sizeof(struct ext4_inode_info), 0,
1477                                 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1478                                         SLAB_ACCOUNT),
1479                                 offsetof(struct ext4_inode_info, i_data),
1480                                 sizeof_field(struct ext4_inode_info, i_data),
1481                                 init_once);
1482         if (ext4_inode_cachep == NULL)
1483                 return -ENOMEM;
1484         return 0;
1485 }
1486
1487 static void destroy_inodecache(void)
1488 {
1489         /*
1490          * Make sure all delayed rcu free inodes are flushed before we
1491          * destroy cache.
1492          */
1493         rcu_barrier();
1494         kmem_cache_destroy(ext4_inode_cachep);
1495 }
1496
1497 void ext4_clear_inode(struct inode *inode)
1498 {
1499         ext4_fc_del(inode);
1500         invalidate_inode_buffers(inode);
1501         clear_inode(inode);
1502         ext4_discard_preallocations(inode, 0);
1503         ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1504         dquot_drop(inode);
1505         if (EXT4_I(inode)->jinode) {
1506                 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1507                                                EXT4_I(inode)->jinode);
1508                 jbd2_free_inode(EXT4_I(inode)->jinode);
1509                 EXT4_I(inode)->jinode = NULL;
1510         }
1511         fscrypt_put_encryption_info(inode);
1512         fsverity_cleanup_inode(inode);
1513 }
1514
1515 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1516                                         u64 ino, u32 generation)
1517 {
1518         struct inode *inode;
1519
1520         /*
1521          * Currently we don't know the generation for parent directory, so
1522          * a generation of 0 means "accept any"
1523          */
1524         inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1525         if (IS_ERR(inode))
1526                 return ERR_CAST(inode);
1527         if (generation && inode->i_generation != generation) {
1528                 iput(inode);
1529                 return ERR_PTR(-ESTALE);
1530         }
1531
1532         return inode;
1533 }
1534
1535 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1536                                         int fh_len, int fh_type)
1537 {
1538         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1539                                     ext4_nfs_get_inode);
1540 }
1541
1542 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1543                                         int fh_len, int fh_type)
1544 {
1545         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1546                                     ext4_nfs_get_inode);
1547 }
1548
1549 static int ext4_nfs_commit_metadata(struct inode *inode)
1550 {
1551         struct writeback_control wbc = {
1552                 .sync_mode = WB_SYNC_ALL
1553         };
1554
1555         trace_ext4_nfs_commit_metadata(inode);
1556         return ext4_write_inode(inode, &wbc);
1557 }
1558
1559 #ifdef CONFIG_QUOTA
1560 static const char * const quotatypes[] = INITQFNAMES;
1561 #define QTYPE2NAME(t) (quotatypes[t])
1562
1563 static int ext4_write_dquot(struct dquot *dquot);
1564 static int ext4_acquire_dquot(struct dquot *dquot);
1565 static int ext4_release_dquot(struct dquot *dquot);
1566 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1567 static int ext4_write_info(struct super_block *sb, int type);
1568 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1569                          const struct path *path);
1570 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1571                                size_t len, loff_t off);
1572 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1573                                 const char *data, size_t len, loff_t off);
1574 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1575                              unsigned int flags);
1576
1577 static struct dquot **ext4_get_dquots(struct inode *inode)
1578 {
1579         return EXT4_I(inode)->i_dquot;
1580 }
1581
1582 static const struct dquot_operations ext4_quota_operations = {
1583         .get_reserved_space     = ext4_get_reserved_space,
1584         .write_dquot            = ext4_write_dquot,
1585         .acquire_dquot          = ext4_acquire_dquot,
1586         .release_dquot          = ext4_release_dquot,
1587         .mark_dirty             = ext4_mark_dquot_dirty,
1588         .write_info             = ext4_write_info,
1589         .alloc_dquot            = dquot_alloc,
1590         .destroy_dquot          = dquot_destroy,
1591         .get_projid             = ext4_get_projid,
1592         .get_inode_usage        = ext4_get_inode_usage,
1593         .get_next_id            = dquot_get_next_id,
1594 };
1595
1596 static const struct quotactl_ops ext4_qctl_operations = {
1597         .quota_on       = ext4_quota_on,
1598         .quota_off      = ext4_quota_off,
1599         .quota_sync     = dquot_quota_sync,
1600         .get_state      = dquot_get_state,
1601         .set_info       = dquot_set_dqinfo,
1602         .get_dqblk      = dquot_get_dqblk,
1603         .set_dqblk      = dquot_set_dqblk,
1604         .get_nextdqblk  = dquot_get_next_dqblk,
1605 };
1606 #endif
1607
1608 static const struct super_operations ext4_sops = {
1609         .alloc_inode    = ext4_alloc_inode,
1610         .free_inode     = ext4_free_in_core_inode,
1611         .destroy_inode  = ext4_destroy_inode,
1612         .write_inode    = ext4_write_inode,
1613         .dirty_inode    = ext4_dirty_inode,
1614         .drop_inode     = ext4_drop_inode,
1615         .evict_inode    = ext4_evict_inode,
1616         .put_super      = ext4_put_super,
1617         .sync_fs        = ext4_sync_fs,
1618         .freeze_fs      = ext4_freeze,
1619         .unfreeze_fs    = ext4_unfreeze,
1620         .statfs         = ext4_statfs,
1621         .show_options   = ext4_show_options,
1622         .shutdown       = ext4_shutdown,
1623 #ifdef CONFIG_QUOTA
1624         .quota_read     = ext4_quota_read,
1625         .quota_write    = ext4_quota_write,
1626         .get_dquots     = ext4_get_dquots,
1627 #endif
1628 };
1629
1630 static const struct export_operations ext4_export_ops = {
1631         .fh_to_dentry = ext4_fh_to_dentry,
1632         .fh_to_parent = ext4_fh_to_parent,
1633         .get_parent = ext4_get_parent,
1634         .commit_metadata = ext4_nfs_commit_metadata,
1635 };
1636
1637 enum {
1638         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1639         Opt_resgid, Opt_resuid, Opt_sb,
1640         Opt_nouid32, Opt_debug, Opt_removed,
1641         Opt_user_xattr, Opt_acl,
1642         Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1643         Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1644         Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1645         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1646         Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1647         Opt_inlinecrypt,
1648         Opt_usrjquota, Opt_grpjquota, Opt_quota,
1649         Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1650         Opt_usrquota, Opt_grpquota, Opt_prjquota,
1651         Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
1652         Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1653         Opt_nowarn_on_error, Opt_mblk_io_submit, Opt_debug_want_extra_isize,
1654         Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1655         Opt_inode_readahead_blks, Opt_journal_ioprio,
1656         Opt_dioread_nolock, Opt_dioread_lock,
1657         Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1658         Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1659         Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,
1660         Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type,
1661 #ifdef CONFIG_EXT4_DEBUG
1662         Opt_fc_debug_max_replay, Opt_fc_debug_force
1663 #endif
1664 };
1665
1666 static const struct constant_table ext4_param_errors[] = {
1667         {"continue",    EXT4_MOUNT_ERRORS_CONT},
1668         {"panic",       EXT4_MOUNT_ERRORS_PANIC},
1669         {"remount-ro",  EXT4_MOUNT_ERRORS_RO},
1670         {}
1671 };
1672
1673 static const struct constant_table ext4_param_data[] = {
1674         {"journal",     EXT4_MOUNT_JOURNAL_DATA},
1675         {"ordered",     EXT4_MOUNT_ORDERED_DATA},
1676         {"writeback",   EXT4_MOUNT_WRITEBACK_DATA},
1677         {}
1678 };
1679
1680 static const struct constant_table ext4_param_data_err[] = {
1681         {"abort",       Opt_data_err_abort},
1682         {"ignore",      Opt_data_err_ignore},
1683         {}
1684 };
1685
1686 static const struct constant_table ext4_param_jqfmt[] = {
1687         {"vfsold",      QFMT_VFS_OLD},
1688         {"vfsv0",       QFMT_VFS_V0},
1689         {"vfsv1",       QFMT_VFS_V1},
1690         {}
1691 };
1692
1693 static const struct constant_table ext4_param_dax[] = {
1694         {"always",      Opt_dax_always},
1695         {"inode",       Opt_dax_inode},
1696         {"never",       Opt_dax_never},
1697         {}
1698 };
1699
1700 /* String parameter that allows empty argument */
1701 #define fsparam_string_empty(NAME, OPT) \
1702         __fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL)
1703
1704 /*
1705  * Mount option specification
1706  * We don't use fsparam_flag_no because of the way we set the
1707  * options and the way we show them in _ext4_show_options(). To
1708  * keep the changes to a minimum, let's keep the negative options
1709  * separate for now.
1710  */
1711 static const struct fs_parameter_spec ext4_param_specs[] = {
1712         fsparam_flag    ("bsddf",               Opt_bsd_df),
1713         fsparam_flag    ("minixdf",             Opt_minix_df),
1714         fsparam_flag    ("grpid",               Opt_grpid),
1715         fsparam_flag    ("bsdgroups",           Opt_grpid),
1716         fsparam_flag    ("nogrpid",             Opt_nogrpid),
1717         fsparam_flag    ("sysvgroups",          Opt_nogrpid),
1718         fsparam_u32     ("resgid",              Opt_resgid),
1719         fsparam_u32     ("resuid",              Opt_resuid),
1720         fsparam_u32     ("sb",                  Opt_sb),
1721         fsparam_enum    ("errors",              Opt_errors, ext4_param_errors),
1722         fsparam_flag    ("nouid32",             Opt_nouid32),
1723         fsparam_flag    ("debug",               Opt_debug),
1724         fsparam_flag    ("oldalloc",            Opt_removed),
1725         fsparam_flag    ("orlov",               Opt_removed),
1726         fsparam_flag    ("user_xattr",          Opt_user_xattr),
1727         fsparam_flag    ("acl",                 Opt_acl),
1728         fsparam_flag    ("norecovery",          Opt_noload),
1729         fsparam_flag    ("noload",              Opt_noload),
1730         fsparam_flag    ("bh",                  Opt_removed),
1731         fsparam_flag    ("nobh",                Opt_removed),
1732         fsparam_u32     ("commit",              Opt_commit),
1733         fsparam_u32     ("min_batch_time",      Opt_min_batch_time),
1734         fsparam_u32     ("max_batch_time",      Opt_max_batch_time),
1735         fsparam_u32     ("journal_dev",         Opt_journal_dev),
1736         fsparam_bdev    ("journal_path",        Opt_journal_path),
1737         fsparam_flag    ("journal_checksum",    Opt_journal_checksum),
1738         fsparam_flag    ("nojournal_checksum",  Opt_nojournal_checksum),
1739         fsparam_flag    ("journal_async_commit",Opt_journal_async_commit),
1740         fsparam_flag    ("abort",               Opt_abort),
1741         fsparam_enum    ("data",                Opt_data, ext4_param_data),
1742         fsparam_enum    ("data_err",            Opt_data_err,
1743                                                 ext4_param_data_err),
1744         fsparam_string_empty
1745                         ("usrjquota",           Opt_usrjquota),
1746         fsparam_string_empty
1747                         ("grpjquota",           Opt_grpjquota),
1748         fsparam_enum    ("jqfmt",               Opt_jqfmt, ext4_param_jqfmt),
1749         fsparam_flag    ("grpquota",            Opt_grpquota),
1750         fsparam_flag    ("quota",               Opt_quota),
1751         fsparam_flag    ("noquota",             Opt_noquota),
1752         fsparam_flag    ("usrquota",            Opt_usrquota),
1753         fsparam_flag    ("prjquota",            Opt_prjquota),
1754         fsparam_flag    ("barrier",             Opt_barrier),
1755         fsparam_u32     ("barrier",             Opt_barrier),
1756         fsparam_flag    ("nobarrier",           Opt_nobarrier),
1757         fsparam_flag    ("i_version",           Opt_removed),
1758         fsparam_flag    ("dax",                 Opt_dax),
1759         fsparam_enum    ("dax",                 Opt_dax_type, ext4_param_dax),
1760         fsparam_u32     ("stripe",              Opt_stripe),
1761         fsparam_flag    ("delalloc",            Opt_delalloc),
1762         fsparam_flag    ("nodelalloc",          Opt_nodelalloc),
1763         fsparam_flag    ("warn_on_error",       Opt_warn_on_error),
1764         fsparam_flag    ("nowarn_on_error",     Opt_nowarn_on_error),
1765         fsparam_u32     ("debug_want_extra_isize",
1766                                                 Opt_debug_want_extra_isize),
1767         fsparam_flag    ("mblk_io_submit",      Opt_removed),
1768         fsparam_flag    ("nomblk_io_submit",    Opt_removed),
1769         fsparam_flag    ("block_validity",      Opt_block_validity),
1770         fsparam_flag    ("noblock_validity",    Opt_noblock_validity),
1771         fsparam_u32     ("inode_readahead_blks",
1772                                                 Opt_inode_readahead_blks),
1773         fsparam_u32     ("journal_ioprio",      Opt_journal_ioprio),
1774         fsparam_u32     ("auto_da_alloc",       Opt_auto_da_alloc),
1775         fsparam_flag    ("auto_da_alloc",       Opt_auto_da_alloc),
1776         fsparam_flag    ("noauto_da_alloc",     Opt_noauto_da_alloc),
1777         fsparam_flag    ("dioread_nolock",      Opt_dioread_nolock),
1778         fsparam_flag    ("nodioread_nolock",    Opt_dioread_lock),
1779         fsparam_flag    ("dioread_lock",        Opt_dioread_lock),
1780         fsparam_flag    ("discard",             Opt_discard),
1781         fsparam_flag    ("nodiscard",           Opt_nodiscard),
1782         fsparam_u32     ("init_itable",         Opt_init_itable),
1783         fsparam_flag    ("init_itable",         Opt_init_itable),
1784         fsparam_flag    ("noinit_itable",       Opt_noinit_itable),
1785 #ifdef CONFIG_EXT4_DEBUG
1786         fsparam_flag    ("fc_debug_force",      Opt_fc_debug_force),
1787         fsparam_u32     ("fc_debug_max_replay", Opt_fc_debug_max_replay),
1788 #endif
1789         fsparam_u32     ("max_dir_size_kb",     Opt_max_dir_size_kb),
1790         fsparam_flag    ("test_dummy_encryption",
1791                                                 Opt_test_dummy_encryption),
1792         fsparam_string  ("test_dummy_encryption",
1793                                                 Opt_test_dummy_encryption),
1794         fsparam_flag    ("inlinecrypt",         Opt_inlinecrypt),
1795         fsparam_flag    ("nombcache",           Opt_nombcache),
1796         fsparam_flag    ("no_mbcache",          Opt_nombcache), /* for backward compatibility */
1797         fsparam_flag    ("prefetch_block_bitmaps",
1798                                                 Opt_removed),
1799         fsparam_flag    ("no_prefetch_block_bitmaps",
1800                                                 Opt_no_prefetch_block_bitmaps),
1801         fsparam_s32     ("mb_optimize_scan",    Opt_mb_optimize_scan),
1802         fsparam_string  ("check",               Opt_removed),   /* mount option from ext2/3 */
1803         fsparam_flag    ("nocheck",             Opt_removed),   /* mount option from ext2/3 */
1804         fsparam_flag    ("reservation",         Opt_removed),   /* mount option from ext2/3 */
1805         fsparam_flag    ("noreservation",       Opt_removed),   /* mount option from ext2/3 */
1806         fsparam_u32     ("journal",             Opt_removed),   /* mount option from ext2/3 */
1807         {}
1808 };
1809
1810 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1811
1812 #define MOPT_SET        0x0001
1813 #define MOPT_CLEAR      0x0002
1814 #define MOPT_NOSUPPORT  0x0004
1815 #define MOPT_EXPLICIT   0x0008
1816 #ifdef CONFIG_QUOTA
1817 #define MOPT_Q          0
1818 #define MOPT_QFMT       0x0010
1819 #else
1820 #define MOPT_Q          MOPT_NOSUPPORT
1821 #define MOPT_QFMT       MOPT_NOSUPPORT
1822 #endif
1823 #define MOPT_NO_EXT2    0x0020
1824 #define MOPT_NO_EXT3    0x0040
1825 #define MOPT_EXT4_ONLY  (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1826 #define MOPT_SKIP       0x0080
1827 #define MOPT_2          0x0100
1828
1829 static const struct mount_opts {
1830         int     token;
1831         int     mount_opt;
1832         int     flags;
1833 } ext4_mount_opts[] = {
1834         {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1835         {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1836         {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1837         {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1838         {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1839         {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1840         {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1841          MOPT_EXT4_ONLY | MOPT_SET},
1842         {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1843          MOPT_EXT4_ONLY | MOPT_CLEAR},
1844         {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1845         {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1846         {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1847          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1848         {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1849          MOPT_EXT4_ONLY | MOPT_CLEAR},
1850         {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1851         {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1852         {Opt_commit, 0, MOPT_NO_EXT2},
1853         {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1854          MOPT_EXT4_ONLY | MOPT_CLEAR},
1855         {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1856          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1857         {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1858                                     EXT4_MOUNT_JOURNAL_CHECKSUM),
1859          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1860         {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1861         {Opt_data_err, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_NO_EXT2},
1862         {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1863         {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1864         {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1865         {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1866         {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1867         {Opt_dax_type, 0, MOPT_EXT4_ONLY},
1868         {Opt_journal_dev, 0, MOPT_NO_EXT2},
1869         {Opt_journal_path, 0, MOPT_NO_EXT2},
1870         {Opt_journal_ioprio, 0, MOPT_NO_EXT2},
1871         {Opt_data, 0, MOPT_NO_EXT2},
1872         {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1873 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1874         {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1875 #else
1876         {Opt_acl, 0, MOPT_NOSUPPORT},
1877 #endif
1878         {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1879         {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1880         {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1881         {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1882                                                         MOPT_SET | MOPT_Q},
1883         {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1884                                                         MOPT_SET | MOPT_Q},
1885         {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1886                                                         MOPT_SET | MOPT_Q},
1887         {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1888                        EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1889                                                         MOPT_CLEAR | MOPT_Q},
1890         {Opt_usrjquota, 0, MOPT_Q},
1891         {Opt_grpjquota, 0, MOPT_Q},
1892         {Opt_jqfmt, 0, MOPT_QFMT},
1893         {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1894         {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,
1895          MOPT_SET},
1896 #ifdef CONFIG_EXT4_DEBUG
1897         {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,
1898          MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},
1899 #endif
1900         {Opt_err, 0, 0}
1901 };
1902
1903 #if IS_ENABLED(CONFIG_UNICODE)
1904 static const struct ext4_sb_encodings {
1905         __u16 magic;
1906         char *name;
1907         unsigned int version;
1908 } ext4_sb_encoding_map[] = {
1909         {EXT4_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)},
1910 };
1911
1912 static const struct ext4_sb_encodings *
1913 ext4_sb_read_encoding(const struct ext4_super_block *es)
1914 {
1915         __u16 magic = le16_to_cpu(es->s_encoding);
1916         int i;
1917
1918         for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1919                 if (magic == ext4_sb_encoding_map[i].magic)
1920                         return &ext4_sb_encoding_map[i];
1921
1922         return NULL;
1923 }
1924 #endif
1925
1926 #define EXT4_SPEC_JQUOTA                        (1 <<  0)
1927 #define EXT4_SPEC_JQFMT                         (1 <<  1)
1928 #define EXT4_SPEC_DATAJ                         (1 <<  2)
1929 #define EXT4_SPEC_SB_BLOCK                      (1 <<  3)
1930 #define EXT4_SPEC_JOURNAL_DEV                   (1 <<  4)
1931 #define EXT4_SPEC_JOURNAL_IOPRIO                (1 <<  5)
1932 #define EXT4_SPEC_s_want_extra_isize            (1 <<  7)
1933 #define EXT4_SPEC_s_max_batch_time              (1 <<  8)
1934 #define EXT4_SPEC_s_min_batch_time              (1 <<  9)
1935 #define EXT4_SPEC_s_inode_readahead_blks        (1 << 10)
1936 #define EXT4_SPEC_s_li_wait_mult                (1 << 11)
1937 #define EXT4_SPEC_s_max_dir_size_kb             (1 << 12)
1938 #define EXT4_SPEC_s_stripe                      (1 << 13)
1939 #define EXT4_SPEC_s_resuid                      (1 << 14)
1940 #define EXT4_SPEC_s_resgid                      (1 << 15)
1941 #define EXT4_SPEC_s_commit_interval             (1 << 16)
1942 #define EXT4_SPEC_s_fc_debug_max_replay         (1 << 17)
1943 #define EXT4_SPEC_s_sb_block                    (1 << 18)
1944 #define EXT4_SPEC_mb_optimize_scan              (1 << 19)
1945
1946 struct ext4_fs_context {
1947         char            *s_qf_names[EXT4_MAXQUOTAS];
1948         struct fscrypt_dummy_policy dummy_enc_policy;
1949         int             s_jquota_fmt;   /* Format of quota to use */
1950 #ifdef CONFIG_EXT4_DEBUG
1951         int s_fc_debug_max_replay;
1952 #endif
1953         unsigned short  qname_spec;
1954         unsigned long   vals_s_flags;   /* Bits to set in s_flags */
1955         unsigned long   mask_s_flags;   /* Bits changed in s_flags */
1956         unsigned long   journal_devnum;
1957         unsigned long   s_commit_interval;
1958         unsigned long   s_stripe;
1959         unsigned int    s_inode_readahead_blks;
1960         unsigned int    s_want_extra_isize;
1961         unsigned int    s_li_wait_mult;
1962         unsigned int    s_max_dir_size_kb;
1963         unsigned int    journal_ioprio;
1964         unsigned int    vals_s_mount_opt;
1965         unsigned int    mask_s_mount_opt;
1966         unsigned int    vals_s_mount_opt2;
1967         unsigned int    mask_s_mount_opt2;
1968         unsigned long   vals_s_mount_flags;
1969         unsigned long   mask_s_mount_flags;
1970         unsigned int    opt_flags;      /* MOPT flags */
1971         unsigned int    spec;
1972         u32             s_max_batch_time;
1973         u32             s_min_batch_time;
1974         kuid_t          s_resuid;
1975         kgid_t          s_resgid;
1976         ext4_fsblk_t    s_sb_block;
1977 };
1978
1979 static void ext4_fc_free(struct fs_context *fc)
1980 {
1981         struct ext4_fs_context *ctx = fc->fs_private;
1982         int i;
1983
1984         if (!ctx)
1985                 return;
1986
1987         for (i = 0; i < EXT4_MAXQUOTAS; i++)
1988                 kfree(ctx->s_qf_names[i]);
1989
1990         fscrypt_free_dummy_policy(&ctx->dummy_enc_policy);
1991         kfree(ctx);
1992 }
1993
1994 int ext4_init_fs_context(struct fs_context *fc)
1995 {
1996         struct ext4_fs_context *ctx;
1997
1998         ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
1999         if (!ctx)
2000                 return -ENOMEM;
2001
2002         fc->fs_private = ctx;
2003         fc->ops = &ext4_context_ops;
2004
2005         return 0;
2006 }
2007
2008 #ifdef CONFIG_QUOTA
2009 /*
2010  * Note the name of the specified quota file.
2011  */
2012 static int note_qf_name(struct fs_context *fc, int qtype,
2013                        struct fs_parameter *param)
2014 {
2015         struct ext4_fs_context *ctx = fc->fs_private;
2016         char *qname;
2017
2018         if (param->size < 1) {
2019                 ext4_msg(NULL, KERN_ERR, "Missing quota name");
2020                 return -EINVAL;
2021         }
2022         if (strchr(param->string, '/')) {
2023                 ext4_msg(NULL, KERN_ERR,
2024                          "quotafile must be on filesystem root");
2025                 return -EINVAL;
2026         }
2027         if (ctx->s_qf_names[qtype]) {
2028                 if (strcmp(ctx->s_qf_names[qtype], param->string) != 0) {
2029                         ext4_msg(NULL, KERN_ERR,
2030                                  "%s quota file already specified",
2031                                  QTYPE2NAME(qtype));
2032                         return -EINVAL;
2033                 }
2034                 return 0;
2035         }
2036
2037         qname = kmemdup_nul(param->string, param->size, GFP_KERNEL);
2038         if (!qname) {
2039                 ext4_msg(NULL, KERN_ERR,
2040                          "Not enough memory for storing quotafile name");
2041                 return -ENOMEM;
2042         }
2043         ctx->s_qf_names[qtype] = qname;
2044         ctx->qname_spec |= 1 << qtype;
2045         ctx->spec |= EXT4_SPEC_JQUOTA;
2046         return 0;
2047 }
2048
2049 /*
2050  * Clear the name of the specified quota file.
2051  */
2052 static int unnote_qf_name(struct fs_context *fc, int qtype)
2053 {
2054         struct ext4_fs_context *ctx = fc->fs_private;
2055
2056         if (ctx->s_qf_names[qtype])
2057                 kfree(ctx->s_qf_names[qtype]);
2058
2059         ctx->s_qf_names[qtype] = NULL;
2060         ctx->qname_spec |= 1 << qtype;
2061         ctx->spec |= EXT4_SPEC_JQUOTA;
2062         return 0;
2063 }
2064 #endif
2065
2066 static int ext4_parse_test_dummy_encryption(const struct fs_parameter *param,
2067                                             struct ext4_fs_context *ctx)
2068 {
2069         int err;
2070
2071         if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) {
2072                 ext4_msg(NULL, KERN_WARNING,
2073                          "test_dummy_encryption option not supported");
2074                 return -EINVAL;
2075         }
2076         err = fscrypt_parse_test_dummy_encryption(param,
2077                                                   &ctx->dummy_enc_policy);
2078         if (err == -EINVAL) {
2079                 ext4_msg(NULL, KERN_WARNING,
2080                          "Value of option \"%s\" is unrecognized", param->key);
2081         } else if (err == -EEXIST) {
2082                 ext4_msg(NULL, KERN_WARNING,
2083                          "Conflicting test_dummy_encryption options");
2084                 return -EINVAL;
2085         }
2086         return err;
2087 }
2088
2089 #define EXT4_SET_CTX(name)                                              \
2090 static inline void ctx_set_##name(struct ext4_fs_context *ctx,          \
2091                                   unsigned long flag)                   \
2092 {                                                                       \
2093         ctx->mask_s_##name |= flag;                                     \
2094         ctx->vals_s_##name |= flag;                                     \
2095 }
2096
2097 #define EXT4_CLEAR_CTX(name)                                            \
2098 static inline void ctx_clear_##name(struct ext4_fs_context *ctx,        \
2099                                     unsigned long flag)                 \
2100 {                                                                       \
2101         ctx->mask_s_##name |= flag;                                     \
2102         ctx->vals_s_##name &= ~flag;                                    \
2103 }
2104
2105 #define EXT4_TEST_CTX(name)                                             \
2106 static inline unsigned long                                             \
2107 ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag)        \
2108 {                                                                       \
2109         return (ctx->vals_s_##name & flag);                             \
2110 }
2111
2112 EXT4_SET_CTX(flags); /* set only */
2113 EXT4_SET_CTX(mount_opt);
2114 EXT4_CLEAR_CTX(mount_opt);
2115 EXT4_TEST_CTX(mount_opt);
2116 EXT4_SET_CTX(mount_opt2);
2117 EXT4_CLEAR_CTX(mount_opt2);
2118 EXT4_TEST_CTX(mount_opt2);
2119
2120 static inline void ctx_set_mount_flag(struct ext4_fs_context *ctx, int bit)
2121 {
2122         set_bit(bit, &ctx->mask_s_mount_flags);
2123         set_bit(bit, &ctx->vals_s_mount_flags);
2124 }
2125
2126 static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
2127 {
2128         struct ext4_fs_context *ctx = fc->fs_private;
2129         struct fs_parse_result result;
2130         const struct mount_opts *m;
2131         int is_remount;
2132         kuid_t uid;
2133         kgid_t gid;
2134         int token;
2135
2136         token = fs_parse(fc, ext4_param_specs, param, &result);
2137         if (token < 0)
2138                 return token;
2139         is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
2140
2141         for (m = ext4_mount_opts; m->token != Opt_err; m++)
2142                 if (token == m->token)
2143                         break;
2144
2145         ctx->opt_flags |= m->flags;
2146
2147         if (m->flags & MOPT_EXPLICIT) {
2148                 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
2149                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_EXPLICIT_DELALLOC);
2150                 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
2151                         ctx_set_mount_opt2(ctx,
2152                                        EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM);
2153                 } else
2154                         return -EINVAL;
2155         }
2156
2157         if (m->flags & MOPT_NOSUPPORT) {
2158                 ext4_msg(NULL, KERN_ERR, "%s option not supported",
2159                          param->key);
2160                 return 0;
2161         }
2162
2163         switch (token) {
2164 #ifdef CONFIG_QUOTA
2165         case Opt_usrjquota:
2166                 if (!*param->string)
2167                         return unnote_qf_name(fc, USRQUOTA);
2168                 else
2169                         return note_qf_name(fc, USRQUOTA, param);
2170         case Opt_grpjquota:
2171                 if (!*param->string)
2172                         return unnote_qf_name(fc, GRPQUOTA);
2173                 else
2174                         return note_qf_name(fc, GRPQUOTA, param);
2175 #endif
2176         case Opt_sb:
2177                 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
2178                         ext4_msg(NULL, KERN_WARNING,
2179                                  "Ignoring %s option on remount", param->key);
2180                 } else {
2181                         ctx->s_sb_block = result.uint_32;
2182                         ctx->spec |= EXT4_SPEC_s_sb_block;
2183                 }
2184                 return 0;
2185         case Opt_removed:
2186                 ext4_msg(NULL, KERN_WARNING, "Ignoring removed %s option",
2187                          param->key);
2188                 return 0;
2189         case Opt_abort:
2190                 ctx_set_mount_flag(ctx, EXT4_MF_FS_ABORTED);
2191                 return 0;
2192         case Opt_inlinecrypt:
2193 #ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
2194                 ctx_set_flags(ctx, SB_INLINECRYPT);
2195 #else
2196                 ext4_msg(NULL, KERN_ERR, "inline encryption not supported");
2197 #endif
2198                 return 0;
2199         case Opt_errors:
2200                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_ERRORS_MASK);
2201                 ctx_set_mount_opt(ctx, result.uint_32);
2202                 return 0;
2203 #ifdef CONFIG_QUOTA
2204         case Opt_jqfmt:
2205                 ctx->s_jquota_fmt = result.uint_32;
2206                 ctx->spec |= EXT4_SPEC_JQFMT;
2207                 return 0;
2208 #endif
2209         case Opt_data:
2210                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
2211                 ctx_set_mount_opt(ctx, result.uint_32);
2212                 ctx->spec |= EXT4_SPEC_DATAJ;
2213                 return 0;
2214         case Opt_commit:
2215                 if (result.uint_32 == 0)
2216                         result.uint_32 = JBD2_DEFAULT_MAX_COMMIT_AGE;
2217                 else if (result.uint_32 > INT_MAX / HZ) {
2218                         ext4_msg(NULL, KERN_ERR,
2219                                  "Invalid commit interval %d, "
2220                                  "must be smaller than %d",
2221                                  result.uint_32, INT_MAX / HZ);
2222                         return -EINVAL;
2223                 }
2224                 ctx->s_commit_interval = HZ * result.uint_32;
2225                 ctx->spec |= EXT4_SPEC_s_commit_interval;
2226                 return 0;
2227         case Opt_debug_want_extra_isize:
2228                 if ((result.uint_32 & 1) || (result.uint_32 < 4)) {
2229                         ext4_msg(NULL, KERN_ERR,
2230                                  "Invalid want_extra_isize %d", result.uint_32);
2231                         return -EINVAL;
2232                 }
2233                 ctx->s_want_extra_isize = result.uint_32;
2234                 ctx->spec |= EXT4_SPEC_s_want_extra_isize;
2235                 return 0;
2236         case Opt_max_batch_time:
2237                 ctx->s_max_batch_time = result.uint_32;
2238                 ctx->spec |= EXT4_SPEC_s_max_batch_time;
2239                 return 0;
2240         case Opt_min_batch_time:
2241                 ctx->s_min_batch_time = result.uint_32;
2242                 ctx->spec |= EXT4_SPEC_s_min_batch_time;
2243                 return 0;
2244         case Opt_inode_readahead_blks:
2245                 if (result.uint_32 &&
2246                     (result.uint_32 > (1 << 30) ||
2247                      !is_power_of_2(result.uint_32))) {
2248                         ext4_msg(NULL, KERN_ERR,
2249                                  "EXT4-fs: inode_readahead_blks must be "
2250                                  "0 or a power of 2 smaller than 2^31");
2251                         return -EINVAL;
2252                 }
2253                 ctx->s_inode_readahead_blks = result.uint_32;
2254                 ctx->spec |= EXT4_SPEC_s_inode_readahead_blks;
2255                 return 0;
2256         case Opt_init_itable:
2257                 ctx_set_mount_opt(ctx, EXT4_MOUNT_INIT_INODE_TABLE);
2258                 ctx->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
2259                 if (param->type == fs_value_is_string)
2260                         ctx->s_li_wait_mult = result.uint_32;
2261                 ctx->spec |= EXT4_SPEC_s_li_wait_mult;
2262                 return 0;
2263         case Opt_max_dir_size_kb:
2264                 ctx->s_max_dir_size_kb = result.uint_32;
2265                 ctx->spec |= EXT4_SPEC_s_max_dir_size_kb;
2266                 return 0;
2267 #ifdef CONFIG_EXT4_DEBUG
2268         case Opt_fc_debug_max_replay:
2269                 ctx->s_fc_debug_max_replay = result.uint_32;
2270                 ctx->spec |= EXT4_SPEC_s_fc_debug_max_replay;
2271                 return 0;
2272 #endif
2273         case Opt_stripe:
2274                 ctx->s_stripe = result.uint_32;
2275                 ctx->spec |= EXT4_SPEC_s_stripe;
2276                 return 0;
2277         case Opt_resuid:
2278                 uid = make_kuid(current_user_ns(), result.uint_32);
2279                 if (!uid_valid(uid)) {
2280                         ext4_msg(NULL, KERN_ERR, "Invalid uid value %d",
2281                                  result.uint_32);
2282                         return -EINVAL;
2283                 }
2284                 ctx->s_resuid = uid;
2285                 ctx->spec |= EXT4_SPEC_s_resuid;
2286                 return 0;
2287         case Opt_resgid:
2288                 gid = make_kgid(current_user_ns(), result.uint_32);
2289                 if (!gid_valid(gid)) {
2290                         ext4_msg(NULL, KERN_ERR, "Invalid gid value %d",
2291                                  result.uint_32);
2292                         return -EINVAL;
2293                 }
2294                 ctx->s_resgid = gid;
2295                 ctx->spec |= EXT4_SPEC_s_resgid;
2296                 return 0;
2297         case Opt_journal_dev:
2298                 if (is_remount) {
2299                         ext4_msg(NULL, KERN_ERR,
2300                                  "Cannot specify journal on remount");
2301                         return -EINVAL;
2302                 }
2303                 ctx->journal_devnum = result.uint_32;
2304                 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
2305                 return 0;
2306         case Opt_journal_path:
2307         {
2308                 struct inode *journal_inode;
2309                 struct path path;
2310                 int error;
2311
2312                 if (is_remount) {
2313                         ext4_msg(NULL, KERN_ERR,
2314                                  "Cannot specify journal on remount");
2315                         return -EINVAL;
2316                 }
2317
2318                 error = fs_lookup_param(fc, param, 1, LOOKUP_FOLLOW, &path);
2319                 if (error) {
2320                         ext4_msg(NULL, KERN_ERR, "error: could not find "
2321                                  "journal device path");
2322                         return -EINVAL;
2323                 }
2324
2325                 journal_inode = d_inode(path.dentry);
2326                 ctx->journal_devnum = new_encode_dev(journal_inode->i_rdev);
2327                 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
2328                 path_put(&path);
2329                 return 0;
2330         }
2331         case Opt_journal_ioprio:
2332                 if (result.uint_32 > 7) {
2333                         ext4_msg(NULL, KERN_ERR, "Invalid journal IO priority"
2334                                  " (must be 0-7)");
2335                         return -EINVAL;
2336                 }
2337                 ctx->journal_ioprio =
2338                         IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, result.uint_32);
2339                 ctx->spec |= EXT4_SPEC_JOURNAL_IOPRIO;
2340                 return 0;
2341         case Opt_test_dummy_encryption:
2342                 return ext4_parse_test_dummy_encryption(param, ctx);
2343         case Opt_dax:
2344         case Opt_dax_type:
2345 #ifdef CONFIG_FS_DAX
2346         {
2347                 int type = (token == Opt_dax) ?
2348                            Opt_dax : result.uint_32;
2349
2350                 switch (type) {
2351                 case Opt_dax:
2352                 case Opt_dax_always:
2353                         ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2354                         ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2355                         break;
2356                 case Opt_dax_never:
2357                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2358                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2359                         break;
2360                 case Opt_dax_inode:
2361                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2362                         ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2363                         /* Strictly for printing options */
2364                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE);
2365                         break;
2366                 }
2367                 return 0;
2368         }
2369 #else
2370                 ext4_msg(NULL, KERN_INFO, "dax option not supported");
2371                 return -EINVAL;
2372 #endif
2373         case Opt_data_err:
2374                 if (result.uint_32 == Opt_data_err_abort)
2375                         ctx_set_mount_opt(ctx, m->mount_opt);
2376                 else if (result.uint_32 == Opt_data_err_ignore)
2377                         ctx_clear_mount_opt(ctx, m->mount_opt);
2378                 return 0;
2379         case Opt_mb_optimize_scan:
2380                 if (result.int_32 == 1) {
2381                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);
2382                         ctx->spec |= EXT4_SPEC_mb_optimize_scan;
2383                 } else if (result.int_32 == 0) {
2384                         ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);
2385                         ctx->spec |= EXT4_SPEC_mb_optimize_scan;
2386                 } else {
2387                         ext4_msg(NULL, KERN_WARNING,
2388                                  "mb_optimize_scan should be set to 0 or 1.");
2389                         return -EINVAL;
2390                 }
2391                 return 0;
2392         }
2393
2394         /*
2395          * At this point we should only be getting options requiring MOPT_SET,
2396          * or MOPT_CLEAR. Anything else is a bug
2397          */
2398         if (m->token == Opt_err) {
2399                 ext4_msg(NULL, KERN_WARNING, "buggy handling of option %s",
2400                          param->key);
2401                 WARN_ON(1);
2402                 return -EINVAL;
2403         }
2404
2405         else {
2406                 unsigned int set = 0;
2407
2408                 if ((param->type == fs_value_is_flag) ||
2409                     result.uint_32 > 0)
2410                         set = 1;
2411
2412                 if (m->flags & MOPT_CLEAR)
2413                         set = !set;
2414                 else if (unlikely(!(m->flags & MOPT_SET))) {
2415                         ext4_msg(NULL, KERN_WARNING,
2416                                  "buggy handling of option %s",
2417                                  param->key);
2418                         WARN_ON(1);
2419                         return -EINVAL;
2420                 }
2421                 if (m->flags & MOPT_2) {
2422                         if (set != 0)
2423                                 ctx_set_mount_opt2(ctx, m->mount_opt);
2424                         else
2425                                 ctx_clear_mount_opt2(ctx, m->mount_opt);
2426                 } else {
2427                         if (set != 0)
2428                                 ctx_set_mount_opt(ctx, m->mount_opt);
2429                         else
2430                                 ctx_clear_mount_opt(ctx, m->mount_opt);
2431                 }
2432         }
2433
2434         return 0;
2435 }
2436
2437 static int parse_options(struct fs_context *fc, char *options)
2438 {
2439         struct fs_parameter param;
2440         int ret;
2441         char *key;
2442
2443         if (!options)
2444                 return 0;
2445
2446         while ((key = strsep(&options, ",")) != NULL) {
2447                 if (*key) {
2448                         size_t v_len = 0;
2449                         char *value = strchr(key, '=');
2450
2451                         param.type = fs_value_is_flag;
2452                         param.string = NULL;
2453
2454                         if (value) {
2455                                 if (value == key)
2456                                         continue;
2457
2458                                 *value++ = 0;
2459                                 v_len = strlen(value);
2460                                 param.string = kmemdup_nul(value, v_len,
2461                                                            GFP_KERNEL);
2462                                 if (!param.string)
2463                                         return -ENOMEM;
2464                                 param.type = fs_value_is_string;
2465                         }
2466
2467                         param.key = key;
2468                         param.size = v_len;
2469
2470                         ret = ext4_parse_param(fc, &param);
2471                         if (param.string)
2472                                 kfree(param.string);
2473                         if (ret < 0)
2474                                 return ret;
2475                 }
2476         }
2477
2478         ret = ext4_validate_options(fc);
2479         if (ret < 0)
2480                 return ret;
2481
2482         return 0;
2483 }
2484
2485 static int parse_apply_sb_mount_options(struct super_block *sb,
2486                                         struct ext4_fs_context *m_ctx)
2487 {
2488         struct ext4_sb_info *sbi = EXT4_SB(sb);
2489         char *s_mount_opts = NULL;
2490         struct ext4_fs_context *s_ctx = NULL;
2491         struct fs_context *fc = NULL;
2492         int ret = -ENOMEM;
2493
2494         if (!sbi->s_es->s_mount_opts[0])
2495                 return 0;
2496
2497         s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
2498                                 sizeof(sbi->s_es->s_mount_opts),
2499                                 GFP_KERNEL);
2500         if (!s_mount_opts)
2501                 return ret;
2502
2503         fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL);
2504         if (!fc)
2505                 goto out_free;
2506
2507         s_ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
2508         if (!s_ctx)
2509                 goto out_free;
2510
2511         fc->fs_private = s_ctx;
2512         fc->s_fs_info = sbi;
2513
2514         ret = parse_options(fc, s_mount_opts);
2515         if (ret < 0)
2516                 goto parse_failed;
2517
2518         ret = ext4_check_opt_consistency(fc, sb);
2519         if (ret < 0) {
2520 parse_failed:
2521                 ext4_msg(sb, KERN_WARNING,
2522                          "failed to parse options in superblock: %s",
2523                          s_mount_opts);
2524                 ret = 0;
2525                 goto out_free;
2526         }
2527
2528         if (s_ctx->spec & EXT4_SPEC_JOURNAL_DEV)
2529                 m_ctx->journal_devnum = s_ctx->journal_devnum;
2530         if (s_ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)
2531                 m_ctx->journal_ioprio = s_ctx->journal_ioprio;
2532
2533         ext4_apply_options(fc, sb);
2534         ret = 0;
2535
2536 out_free:
2537         if (fc) {
2538                 ext4_fc_free(fc);
2539                 kfree(fc);
2540         }
2541         kfree(s_mount_opts);
2542         return ret;
2543 }
2544
2545 static void ext4_apply_quota_options(struct fs_context *fc,
2546                                      struct super_block *sb)
2547 {
2548 #ifdef CONFIG_QUOTA
2549         bool quota_feature = ext4_has_feature_quota(sb);
2550         struct ext4_fs_context *ctx = fc->fs_private;
2551         struct ext4_sb_info *sbi = EXT4_SB(sb);
2552         char *qname;
2553         int i;
2554
2555         if (quota_feature)
2556                 return;
2557
2558         if (ctx->spec & EXT4_SPEC_JQUOTA) {
2559                 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2560                         if (!(ctx->qname_spec & (1 << i)))
2561                                 continue;
2562
2563                         qname = ctx->s_qf_names[i]; /* May be NULL */
2564                         if (qname)
2565                                 set_opt(sb, QUOTA);
2566                         ctx->s_qf_names[i] = NULL;
2567                         qname = rcu_replace_pointer(sbi->s_qf_names[i], qname,
2568                                                 lockdep_is_held(&sb->s_umount));
2569                         if (qname)
2570                                 kfree_rcu_mightsleep(qname);
2571                 }
2572         }
2573
2574         if (ctx->spec & EXT4_SPEC_JQFMT)
2575                 sbi->s_jquota_fmt = ctx->s_jquota_fmt;
2576 #endif
2577 }
2578
2579 /*
2580  * Check quota settings consistency.
2581  */
2582 static int ext4_check_quota_consistency(struct fs_context *fc,
2583                                         struct super_block *sb)
2584 {
2585 #ifdef CONFIG_QUOTA
2586         struct ext4_fs_context *ctx = fc->fs_private;
2587         struct ext4_sb_info *sbi = EXT4_SB(sb);
2588         bool quota_feature = ext4_has_feature_quota(sb);
2589         bool quota_loaded = sb_any_quota_loaded(sb);
2590         bool usr_qf_name, grp_qf_name, usrquota, grpquota;
2591         int quota_flags, i;
2592
2593         /*
2594          * We do the test below only for project quotas. 'usrquota' and
2595          * 'grpquota' mount options are allowed even without quota feature
2596          * to support legacy quotas in quota files.
2597          */
2598         if (ctx_test_mount_opt(ctx, EXT4_MOUNT_PRJQUOTA) &&
2599             !ext4_has_feature_project(sb)) {
2600                 ext4_msg(NULL, KERN_ERR, "Project quota feature not enabled. "
2601                          "Cannot enable project quota enforcement.");
2602                 return -EINVAL;
2603         }
2604
2605         quota_flags = EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
2606                       EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA;
2607         if (quota_loaded &&
2608             ctx->mask_s_mount_opt & quota_flags &&
2609             !ctx_test_mount_opt(ctx, quota_flags))
2610                 goto err_quota_change;
2611
2612         if (ctx->spec & EXT4_SPEC_JQUOTA) {
2613
2614                 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2615                         if (!(ctx->qname_spec & (1 << i)))
2616                                 continue;
2617
2618                         if (quota_loaded &&
2619                             !!sbi->s_qf_names[i] != !!ctx->s_qf_names[i])
2620                                 goto err_jquota_change;
2621
2622                         if (sbi->s_qf_names[i] && ctx->s_qf_names[i] &&
2623                             strcmp(get_qf_name(sb, sbi, i),
2624                                    ctx->s_qf_names[i]) != 0)
2625                                 goto err_jquota_specified;
2626                 }
2627
2628                 if (quota_feature) {
2629                         ext4_msg(NULL, KERN_INFO,
2630                                  "Journaled quota options ignored when "
2631                                  "QUOTA feature is enabled");
2632                         return 0;
2633                 }
2634         }
2635
2636         if (ctx->spec & EXT4_SPEC_JQFMT) {
2637                 if (sbi->s_jquota_fmt != ctx->s_jquota_fmt && quota_loaded)
2638                         goto err_jquota_change;
2639                 if (quota_feature) {
2640                         ext4_msg(NULL, KERN_INFO, "Quota format mount options "
2641                                  "ignored when QUOTA feature is enabled");
2642                         return 0;
2643                 }
2644         }
2645
2646         /* Make sure we don't mix old and new quota format */
2647         usr_qf_name = (get_qf_name(sb, sbi, USRQUOTA) ||
2648                        ctx->s_qf_names[USRQUOTA]);
2649         grp_qf_name = (get_qf_name(sb, sbi, GRPQUOTA) ||
2650                        ctx->s_qf_names[GRPQUOTA]);
2651
2652         usrquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2653                     test_opt(sb, USRQUOTA));
2654
2655         grpquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) ||
2656                     test_opt(sb, GRPQUOTA));
2657
2658         if (usr_qf_name) {
2659                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
2660                 usrquota = false;
2661         }
2662         if (grp_qf_name) {
2663                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
2664                 grpquota = false;
2665         }
2666
2667         if (usr_qf_name || grp_qf_name) {
2668                 if (usrquota || grpquota) {
2669                         ext4_msg(NULL, KERN_ERR, "old and new quota "
2670                                  "format mixing");
2671                         return -EINVAL;
2672                 }
2673
2674                 if (!(ctx->spec & EXT4_SPEC_JQFMT || sbi->s_jquota_fmt)) {
2675                         ext4_msg(NULL, KERN_ERR, "journaled quota format "
2676                                  "not specified");
2677                         return -EINVAL;
2678                 }
2679         }
2680
2681         return 0;
2682
2683 err_quota_change:
2684         ext4_msg(NULL, KERN_ERR,
2685                  "Cannot change quota options when quota turned on");
2686         return -EINVAL;
2687 err_jquota_change:
2688         ext4_msg(NULL, KERN_ERR, "Cannot change journaled quota "
2689                  "options when quota turned on");
2690         return -EINVAL;
2691 err_jquota_specified:
2692         ext4_msg(NULL, KERN_ERR, "%s quota file already specified",
2693                  QTYPE2NAME(i));
2694         return -EINVAL;
2695 #else
2696         return 0;
2697 #endif
2698 }
2699
2700 static int ext4_check_test_dummy_encryption(const struct fs_context *fc,
2701                                             struct super_block *sb)
2702 {
2703         const struct ext4_fs_context *ctx = fc->fs_private;
2704         const struct ext4_sb_info *sbi = EXT4_SB(sb);
2705
2706         if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy))
2707                 return 0;
2708
2709         if (!ext4_has_feature_encrypt(sb)) {
2710                 ext4_msg(NULL, KERN_WARNING,
2711                          "test_dummy_encryption requires encrypt feature");
2712                 return -EINVAL;
2713         }
2714         /*
2715          * This mount option is just for testing, and it's not worthwhile to
2716          * implement the extra complexity (e.g. RCU protection) that would be
2717          * needed to allow it to be set or changed during remount.  We do allow
2718          * it to be specified during remount, but only if there is no change.
2719          */
2720         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
2721                 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,
2722                                                  &ctx->dummy_enc_policy))
2723                         return 0;
2724                 ext4_msg(NULL, KERN_WARNING,
2725                          "Can't set or change test_dummy_encryption on remount");
2726                 return -EINVAL;
2727         }
2728         /* Also make sure s_mount_opts didn't contain a conflicting value. */
2729         if (fscrypt_is_dummy_policy_set(&sbi->s_dummy_enc_policy)) {
2730                 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,
2731                                                  &ctx->dummy_enc_policy))
2732                         return 0;
2733                 ext4_msg(NULL, KERN_WARNING,
2734                          "Conflicting test_dummy_encryption options");
2735                 return -EINVAL;
2736         }
2737         return 0;
2738 }
2739
2740 static void ext4_apply_test_dummy_encryption(struct ext4_fs_context *ctx,
2741                                              struct super_block *sb)
2742 {
2743         if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy) ||
2744             /* if already set, it was already verified to be the same */
2745             fscrypt_is_dummy_policy_set(&EXT4_SB(sb)->s_dummy_enc_policy))
2746                 return;
2747         EXT4_SB(sb)->s_dummy_enc_policy = ctx->dummy_enc_policy;
2748         memset(&ctx->dummy_enc_policy, 0, sizeof(ctx->dummy_enc_policy));
2749         ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
2750 }
2751
2752 static int ext4_check_opt_consistency(struct fs_context *fc,
2753                                       struct super_block *sb)
2754 {
2755         struct ext4_fs_context *ctx = fc->fs_private;
2756         struct ext4_sb_info *sbi = fc->s_fs_info;
2757         int is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
2758         int err;
2759
2760         if ((ctx->opt_flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
2761                 ext4_msg(NULL, KERN_ERR,
2762                          "Mount option(s) incompatible with ext2");
2763                 return -EINVAL;
2764         }
2765         if ((ctx->opt_flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
2766                 ext4_msg(NULL, KERN_ERR,
2767                          "Mount option(s) incompatible with ext3");
2768                 return -EINVAL;
2769         }
2770
2771         if (ctx->s_want_extra_isize >
2772             (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE)) {
2773                 ext4_msg(NULL, KERN_ERR,
2774                          "Invalid want_extra_isize %d",
2775                          ctx->s_want_extra_isize);
2776                 return -EINVAL;
2777         }
2778
2779         if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DIOREAD_NOLOCK)) {
2780                 int blocksize =
2781                         BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2782                 if (blocksize < PAGE_SIZE)
2783                         ext4_msg(NULL, KERN_WARNING, "Warning: mounting with an "
2784                                  "experimental mount option 'dioread_nolock' "
2785                                  "for blocksize < PAGE_SIZE");
2786         }
2787
2788         err = ext4_check_test_dummy_encryption(fc, sb);
2789         if (err)
2790                 return err;
2791
2792         if ((ctx->spec & EXT4_SPEC_DATAJ) && is_remount) {
2793                 if (!sbi->s_journal) {
2794                         ext4_msg(NULL, KERN_WARNING,
2795                                  "Remounting file system with no journal "
2796                                  "so ignoring journalled data option");
2797                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
2798                 } else if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS) !=
2799                            test_opt(sb, DATA_FLAGS)) {
2800                         ext4_msg(NULL, KERN_ERR, "Cannot change data mode "
2801                                  "on remount");
2802                         return -EINVAL;
2803                 }
2804         }
2805
2806         if (is_remount) {
2807                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2808                     (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
2809                         ext4_msg(NULL, KERN_ERR, "can't mount with "
2810                                  "both data=journal and dax");
2811                         return -EINVAL;
2812                 }
2813
2814                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2815                     (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2816                      (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) {
2817 fail_dax_change_remount:
2818                         ext4_msg(NULL, KERN_ERR, "can't change "
2819                                  "dax mount option while remounting");
2820                         return -EINVAL;
2821                 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER) &&
2822                          (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2823                           (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS))) {
2824                         goto fail_dax_change_remount;
2825                 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE) &&
2826                            ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2827                             (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2828                             !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE))) {
2829                         goto fail_dax_change_remount;
2830                 }
2831         }
2832
2833         return ext4_check_quota_consistency(fc, sb);
2834 }
2835
2836 static void ext4_apply_options(struct fs_context *fc, struct super_block *sb)
2837 {
2838         struct ext4_fs_context *ctx = fc->fs_private;
2839         struct ext4_sb_info *sbi = fc->s_fs_info;
2840
2841         sbi->s_mount_opt &= ~ctx->mask_s_mount_opt;
2842         sbi->s_mount_opt |= ctx->vals_s_mount_opt;
2843         sbi->s_mount_opt2 &= ~ctx->mask_s_mount_opt2;
2844         sbi->s_mount_opt2 |= ctx->vals_s_mount_opt2;
2845         sbi->s_mount_flags &= ~ctx->mask_s_mount_flags;
2846         sbi->s_mount_flags |= ctx->vals_s_mount_flags;
2847         sb->s_flags &= ~ctx->mask_s_flags;
2848         sb->s_flags |= ctx->vals_s_flags;
2849
2850 #define APPLY(X) ({ if (ctx->spec & EXT4_SPEC_##X) sbi->X = ctx->X; })
2851         APPLY(s_commit_interval);
2852         APPLY(s_stripe);
2853         APPLY(s_max_batch_time);
2854         APPLY(s_min_batch_time);
2855         APPLY(s_want_extra_isize);
2856         APPLY(s_inode_readahead_blks);
2857         APPLY(s_max_dir_size_kb);
2858         APPLY(s_li_wait_mult);
2859         APPLY(s_resgid);
2860         APPLY(s_resuid);
2861
2862 #ifdef CONFIG_EXT4_DEBUG
2863         APPLY(s_fc_debug_max_replay);
2864 #endif
2865
2866         ext4_apply_quota_options(fc, sb);
2867         ext4_apply_test_dummy_encryption(ctx, sb);
2868 }
2869
2870
2871 static int ext4_validate_options(struct fs_context *fc)
2872 {
2873 #ifdef CONFIG_QUOTA
2874         struct ext4_fs_context *ctx = fc->fs_private;
2875         char *usr_qf_name, *grp_qf_name;
2876
2877         usr_qf_name = ctx->s_qf_names[USRQUOTA];
2878         grp_qf_name = ctx->s_qf_names[GRPQUOTA];
2879
2880         if (usr_qf_name || grp_qf_name) {
2881                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) && usr_qf_name)
2882                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
2883
2884                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) && grp_qf_name)
2885                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
2886
2887                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2888                     ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA)) {
2889                         ext4_msg(NULL, KERN_ERR, "old and new quota "
2890                                  "format mixing");
2891                         return -EINVAL;
2892                 }
2893         }
2894 #endif
2895         return 1;
2896 }
2897
2898 static inline void ext4_show_quota_options(struct seq_file *seq,
2899                                            struct super_block *sb)
2900 {
2901 #if defined(CONFIG_QUOTA)
2902         struct ext4_sb_info *sbi = EXT4_SB(sb);
2903         char *usr_qf_name, *grp_qf_name;
2904
2905         if (sbi->s_jquota_fmt) {
2906                 char *fmtname = "";
2907
2908                 switch (sbi->s_jquota_fmt) {
2909                 case QFMT_VFS_OLD:
2910                         fmtname = "vfsold";
2911                         break;
2912                 case QFMT_VFS_V0:
2913                         fmtname = "vfsv0";
2914                         break;
2915                 case QFMT_VFS_V1:
2916                         fmtname = "vfsv1";
2917                         break;
2918                 }
2919                 seq_printf(seq, ",jqfmt=%s", fmtname);
2920         }
2921
2922         rcu_read_lock();
2923         usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2924         grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2925         if (usr_qf_name)
2926                 seq_show_option(seq, "usrjquota", usr_qf_name);
2927         if (grp_qf_name)
2928                 seq_show_option(seq, "grpjquota", grp_qf_name);
2929         rcu_read_unlock();
2930 #endif
2931 }
2932
2933 static const char *token2str(int token)
2934 {
2935         const struct fs_parameter_spec *spec;
2936
2937         for (spec = ext4_param_specs; spec->name != NULL; spec++)
2938                 if (spec->opt == token && !spec->type)
2939                         break;
2940         return spec->name;
2941 }
2942
2943 /*
2944  * Show an option if
2945  *  - it's set to a non-default value OR
2946  *  - if the per-sb default is different from the global default
2947  */
2948 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2949                               int nodefs)
2950 {
2951         struct ext4_sb_info *sbi = EXT4_SB(sb);
2952         struct ext4_super_block *es = sbi->s_es;
2953         int def_errors;
2954         const struct mount_opts *m;
2955         char sep = nodefs ? '\n' : ',';
2956
2957 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2958 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2959
2960         if (sbi->s_sb_block != 1)
2961                 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2962
2963         for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2964                 int want_set = m->flags & MOPT_SET;
2965                 int opt_2 = m->flags & MOPT_2;
2966                 unsigned int mount_opt, def_mount_opt;
2967
2968                 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2969                     m->flags & MOPT_SKIP)
2970                         continue;
2971
2972                 if (opt_2) {
2973                         mount_opt = sbi->s_mount_opt2;
2974                         def_mount_opt = sbi->s_def_mount_opt2;
2975                 } else {
2976                         mount_opt = sbi->s_mount_opt;
2977                         def_mount_opt = sbi->s_def_mount_opt;
2978                 }
2979                 /* skip if same as the default */
2980                 if (!nodefs && !(m->mount_opt & (mount_opt ^ def_mount_opt)))
2981                         continue;
2982                 /* select Opt_noFoo vs Opt_Foo */
2983                 if ((want_set &&
2984                      (mount_opt & m->mount_opt) != m->mount_opt) ||
2985                     (!want_set && (mount_opt & m->mount_opt)))
2986                         continue;
2987                 SEQ_OPTS_PRINT("%s", token2str(m->token));
2988         }
2989
2990         if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2991             le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2992                 SEQ_OPTS_PRINT("resuid=%u",
2993                                 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2994         if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
2995             le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2996                 SEQ_OPTS_PRINT("resgid=%u",
2997                                 from_kgid_munged(&init_user_ns, sbi->s_resgid));
2998         def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2999         if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
3000                 SEQ_OPTS_PUTS("errors=remount-ro");
3001         if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
3002                 SEQ_OPTS_PUTS("errors=continue");
3003         if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
3004                 SEQ_OPTS_PUTS("errors=panic");
3005         if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
3006                 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
3007         if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
3008                 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
3009         if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
3010                 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
3011         if (nodefs || sbi->s_stripe)
3012                 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
3013         if (nodefs || EXT4_MOUNT_DATA_FLAGS &
3014                         (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3015                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3016                         SEQ_OPTS_PUTS("data=journal");
3017                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3018                         SEQ_OPTS_PUTS("data=ordered");
3019                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
3020                         SEQ_OPTS_PUTS("data=writeback");
3021         }
3022         if (nodefs ||
3023             sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
3024                 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
3025                                sbi->s_inode_readahead_blks);
3026
3027         if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
3028                        (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
3029                 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
3030         if (nodefs || sbi->s_max_dir_size_kb)
3031                 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
3032         if (test_opt(sb, DATA_ERR_ABORT))
3033                 SEQ_OPTS_PUTS("data_err=abort");
3034
3035         fscrypt_show_test_dummy_encryption(seq, sep, sb);
3036
3037         if (sb->s_flags & SB_INLINECRYPT)
3038                 SEQ_OPTS_PUTS("inlinecrypt");
3039
3040         if (test_opt(sb, DAX_ALWAYS)) {
3041                 if (IS_EXT2_SB(sb))
3042                         SEQ_OPTS_PUTS("dax");
3043                 else
3044                         SEQ_OPTS_PUTS("dax=always");
3045         } else if (test_opt2(sb, DAX_NEVER)) {
3046                 SEQ_OPTS_PUTS("dax=never");
3047         } else if (test_opt2(sb, DAX_INODE)) {
3048                 SEQ_OPTS_PUTS("dax=inode");
3049         }
3050
3051         if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
3052                         !test_opt2(sb, MB_OPTIMIZE_SCAN)) {
3053                 SEQ_OPTS_PUTS("mb_optimize_scan=0");
3054         } else if (sbi->s_groups_count < MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
3055                         test_opt2(sb, MB_OPTIMIZE_SCAN)) {
3056                 SEQ_OPTS_PUTS("mb_optimize_scan=1");
3057         }
3058
3059         ext4_show_quota_options(seq, sb);
3060         return 0;
3061 }
3062
3063 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
3064 {
3065         return _ext4_show_options(seq, root->d_sb, 0);
3066 }
3067
3068 int ext4_seq_options_show(struct seq_file *seq, void *offset)
3069 {
3070         struct super_block *sb = seq->private;
3071         int rc;
3072
3073         seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
3074         rc = _ext4_show_options(seq, sb, 1);
3075         seq_puts(seq, "\n");
3076         return rc;
3077 }
3078
3079 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
3080                             int read_only)
3081 {
3082         struct ext4_sb_info *sbi = EXT4_SB(sb);
3083         int err = 0;
3084
3085         if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
3086                 ext4_msg(sb, KERN_ERR, "revision level too high, "
3087                          "forcing read-only mode");
3088                 err = -EROFS;
3089                 goto done;
3090         }
3091         if (read_only)
3092                 goto done;
3093         if (!(sbi->s_mount_state & EXT4_VALID_FS))
3094                 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
3095                          "running e2fsck is recommended");
3096         else if (sbi->s_mount_state & EXT4_ERROR_FS)
3097                 ext4_msg(sb, KERN_WARNING,
3098                          "warning: mounting fs with errors, "
3099                          "running e2fsck is recommended");
3100         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
3101                  le16_to_cpu(es->s_mnt_count) >=
3102                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
3103                 ext4_msg(sb, KERN_WARNING,
3104                          "warning: maximal mount count reached, "
3105                          "running e2fsck is recommended");
3106         else if (le32_to_cpu(es->s_checkinterval) &&
3107                  (ext4_get_tstamp(es, s_lastcheck) +
3108                   le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
3109                 ext4_msg(sb, KERN_WARNING,
3110                          "warning: checktime reached, "
3111                          "running e2fsck is recommended");
3112         if (!sbi->s_journal)
3113                 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
3114         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
3115                 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
3116         le16_add_cpu(&es->s_mnt_count, 1);
3117         ext4_update_tstamp(es, s_mtime);
3118         if (sbi->s_journal) {
3119                 ext4_set_feature_journal_needs_recovery(sb);
3120                 if (ext4_has_feature_orphan_file(sb))
3121                         ext4_set_feature_orphan_present(sb);
3122         }
3123
3124         err = ext4_commit_super(sb);
3125 done:
3126         if (test_opt(sb, DEBUG))
3127                 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
3128                                 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
3129                         sb->s_blocksize,
3130                         sbi->s_groups_count,
3131                         EXT4_BLOCKS_PER_GROUP(sb),
3132                         EXT4_INODES_PER_GROUP(sb),
3133                         sbi->s_mount_opt, sbi->s_mount_opt2);
3134         return err;
3135 }
3136
3137 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
3138 {
3139         struct ext4_sb_info *sbi = EXT4_SB(sb);
3140         struct flex_groups **old_groups, **new_groups;
3141         int size, i, j;
3142
3143         if (!sbi->s_log_groups_per_flex)
3144                 return 0;
3145
3146         size = ext4_flex_group(sbi, ngroup - 1) + 1;
3147         if (size <= sbi->s_flex_groups_allocated)
3148                 return 0;
3149
3150         new_groups = kvzalloc(roundup_pow_of_two(size *
3151                               sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
3152         if (!new_groups) {
3153                 ext4_msg(sb, KERN_ERR,
3154                          "not enough memory for %d flex group pointers", size);
3155                 return -ENOMEM;
3156         }
3157         for (i = sbi->s_flex_groups_allocated; i < size; i++) {
3158                 new_groups[i] = kvzalloc(roundup_pow_of_two(
3159                                          sizeof(struct flex_groups)),
3160                                          GFP_KERNEL);
3161                 if (!new_groups[i]) {
3162                         for (j = sbi->s_flex_groups_allocated; j < i; j++)
3163                                 kvfree(new_groups[j]);
3164                         kvfree(new_groups);
3165                         ext4_msg(sb, KERN_ERR,
3166                                  "not enough memory for %d flex groups", size);
3167                         return -ENOMEM;
3168                 }
3169         }
3170         rcu_read_lock();
3171         old_groups = rcu_dereference(sbi->s_flex_groups);
3172         if (old_groups)
3173                 memcpy(new_groups, old_groups,
3174                        (sbi->s_flex_groups_allocated *
3175                         sizeof(struct flex_groups *)));
3176         rcu_read_unlock();
3177         rcu_assign_pointer(sbi->s_flex_groups, new_groups);
3178         sbi->s_flex_groups_allocated = size;
3179         if (old_groups)
3180                 ext4_kvfree_array_rcu(old_groups);
3181         return 0;
3182 }
3183
3184 static int ext4_fill_flex_info(struct super_block *sb)
3185 {
3186         struct ext4_sb_info *sbi = EXT4_SB(sb);
3187         struct ext4_group_desc *gdp = NULL;
3188         struct flex_groups *fg;
3189         ext4_group_t flex_group;
3190         int i, err;
3191
3192         sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
3193         if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
3194                 sbi->s_log_groups_per_flex = 0;
3195                 return 1;
3196         }
3197
3198         err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
3199         if (err)
3200                 goto failed;
3201
3202         for (i = 0; i < sbi->s_groups_count; i++) {
3203                 gdp = ext4_get_group_desc(sb, i, NULL);
3204
3205                 flex_group = ext4_flex_group(sbi, i);
3206                 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
3207                 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
3208                 atomic64_add(ext4_free_group_clusters(sb, gdp),
3209                              &fg->free_clusters);
3210                 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
3211         }
3212
3213         return 1;
3214 failed:
3215         return 0;
3216 }
3217
3218 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
3219                                    struct ext4_group_desc *gdp)
3220 {
3221         int offset = offsetof(struct ext4_group_desc, bg_checksum);
3222         __u16 crc = 0;
3223         __le32 le_group = cpu_to_le32(block_group);
3224         struct ext4_sb_info *sbi = EXT4_SB(sb);
3225
3226         if (ext4_has_metadata_csum(sbi->s_sb)) {
3227                 /* Use new metadata_csum algorithm */
3228                 __u32 csum32;
3229                 __u16 dummy_csum = 0;
3230
3231                 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
3232                                      sizeof(le_group));
3233                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
3234                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
3235                                      sizeof(dummy_csum));
3236                 offset += sizeof(dummy_csum);
3237                 if (offset < sbi->s_desc_size)
3238                         csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
3239                                              sbi->s_desc_size - offset);
3240
3241                 crc = csum32 & 0xFFFF;
3242                 goto out;
3243         }
3244
3245         /* old crc16 code */
3246         if (!ext4_has_feature_gdt_csum(sb))
3247                 return 0;
3248
3249         crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
3250         crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
3251         crc = crc16(crc, (__u8 *)gdp, offset);
3252         offset += sizeof(gdp->bg_checksum); /* skip checksum */
3253         /* for checksum of struct ext4_group_desc do the rest...*/
3254         if (ext4_has_feature_64bit(sb) && offset < sbi->s_desc_size)
3255                 crc = crc16(crc, (__u8 *)gdp + offset,
3256                             sbi->s_desc_size - offset);
3257
3258 out:
3259         return cpu_to_le16(crc);
3260 }
3261
3262 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
3263                                 struct ext4_group_desc *gdp)
3264 {
3265         if (ext4_has_group_desc_csum(sb) &&
3266             (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
3267                 return 0;
3268
3269         return 1;
3270 }
3271
3272 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
3273                               struct ext4_group_desc *gdp)
3274 {
3275         if (!ext4_has_group_desc_csum(sb))
3276                 return;
3277         gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
3278 }
3279
3280 /* Called at mount-time, super-block is locked */
3281 static int ext4_check_descriptors(struct super_block *sb,
3282                                   ext4_fsblk_t sb_block,
3283                                   ext4_group_t *first_not_zeroed)
3284 {
3285         struct ext4_sb_info *sbi = EXT4_SB(sb);
3286         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
3287         ext4_fsblk_t last_block;
3288         ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
3289         ext4_fsblk_t block_bitmap;
3290         ext4_fsblk_t inode_bitmap;
3291         ext4_fsblk_t inode_table;
3292         int flexbg_flag = 0;
3293         ext4_group_t i, grp = sbi->s_groups_count;
3294
3295         if (ext4_has_feature_flex_bg(sb))
3296                 flexbg_flag = 1;
3297
3298         ext4_debug("Checking group descriptors");
3299
3300         for (i = 0; i < sbi->s_groups_count; i++) {
3301                 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
3302
3303                 if (i == sbi->s_groups_count - 1 || flexbg_flag)
3304                         last_block = ext4_blocks_count(sbi->s_es) - 1;
3305                 else
3306                         last_block = first_block +
3307                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
3308
3309                 if ((grp == sbi->s_groups_count) &&
3310                    !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3311                         grp = i;
3312
3313                 block_bitmap = ext4_block_bitmap(sb, gdp);
3314                 if (block_bitmap == sb_block) {
3315                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3316                                  "Block bitmap for group %u overlaps "
3317                                  "superblock", i);
3318                         if (!sb_rdonly(sb))
3319                                 return 0;
3320                 }
3321                 if (block_bitmap >= sb_block + 1 &&
3322                     block_bitmap <= last_bg_block) {
3323                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3324                                  "Block bitmap for group %u overlaps "
3325                                  "block group descriptors", i);
3326                         if (!sb_rdonly(sb))
3327                                 return 0;
3328                 }
3329                 if (block_bitmap < first_block || block_bitmap > last_block) {
3330                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3331                                "Block bitmap for group %u not in group "
3332                                "(block %llu)!", i, block_bitmap);
3333                         return 0;
3334                 }
3335                 inode_bitmap = ext4_inode_bitmap(sb, gdp);
3336                 if (inode_bitmap == sb_block) {
3337                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3338                                  "Inode bitmap for group %u overlaps "
3339                                  "superblock", i);
3340                         if (!sb_rdonly(sb))
3341                                 return 0;
3342                 }
3343                 if (inode_bitmap >= sb_block + 1 &&
3344                     inode_bitmap <= last_bg_block) {
3345                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3346                                  "Inode bitmap for group %u overlaps "
3347                                  "block group descriptors", i);
3348                         if (!sb_rdonly(sb))
3349                                 return 0;
3350                 }
3351                 if (inode_bitmap < first_block || inode_bitmap > last_block) {
3352                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3353                                "Inode bitmap for group %u not in group "
3354                                "(block %llu)!", i, inode_bitmap);
3355                         return 0;
3356                 }
3357                 inode_table = ext4_inode_table(sb, gdp);
3358                 if (inode_table == sb_block) {
3359                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3360                                  "Inode table for group %u overlaps "
3361                                  "superblock", i);
3362                         if (!sb_rdonly(sb))
3363                                 return 0;
3364                 }
3365                 if (inode_table >= sb_block + 1 &&
3366                     inode_table <= last_bg_block) {
3367                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3368                                  "Inode table for group %u overlaps "
3369                                  "block group descriptors", i);
3370                         if (!sb_rdonly(sb))
3371                                 return 0;
3372                 }
3373                 if (inode_table < first_block ||
3374                     inode_table + sbi->s_itb_per_group - 1 > last_block) {
3375                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3376                                "Inode table for group %u not in group "
3377                                "(block %llu)!", i, inode_table);
3378                         return 0;
3379                 }
3380                 ext4_lock_group(sb, i);
3381                 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
3382                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3383                                  "Checksum for group %u failed (%u!=%u)",
3384                                  i, le16_to_cpu(ext4_group_desc_csum(sb, i,
3385                                      gdp)), le16_to_cpu(gdp->bg_checksum));
3386                         if (!sb_rdonly(sb)) {
3387                                 ext4_unlock_group(sb, i);
3388                                 return 0;
3389                         }
3390                 }
3391                 ext4_unlock_group(sb, i);
3392                 if (!flexbg_flag)
3393                         first_block += EXT4_BLOCKS_PER_GROUP(sb);
3394         }
3395         if (NULL != first_not_zeroed)
3396                 *first_not_zeroed = grp;
3397         return 1;
3398 }
3399
3400 /*
3401  * Maximal extent format file size.
3402  * Resulting logical blkno at s_maxbytes must fit in our on-disk
3403  * extent format containers, within a sector_t, and within i_blocks
3404  * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
3405  * so that won't be a limiting factor.
3406  *
3407  * However there is other limiting factor. We do store extents in the form
3408  * of starting block and length, hence the resulting length of the extent
3409  * covering maximum file size must fit into on-disk format containers as
3410  * well. Given that length is always by 1 unit bigger than max unit (because
3411  * we count 0 as well) we have to lower the s_maxbytes by one fs block.
3412  *
3413  * Note, this does *not* consider any metadata overhead for vfs i_blocks.
3414  */
3415 static loff_t ext4_max_size(int blkbits, int has_huge_files)
3416 {
3417         loff_t res;
3418         loff_t upper_limit = MAX_LFS_FILESIZE;
3419
3420         BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
3421
3422         if (!has_huge_files) {
3423                 upper_limit = (1LL << 32) - 1;
3424
3425                 /* total blocks in file system block size */
3426                 upper_limit >>= (blkbits - 9);
3427                 upper_limit <<= blkbits;
3428         }
3429
3430         /*
3431          * 32-bit extent-start container, ee_block. We lower the maxbytes
3432          * by one fs block, so ee_len can cover the extent of maximum file
3433          * size
3434          */
3435         res = (1LL << 32) - 1;
3436         res <<= blkbits;
3437
3438         /* Sanity check against vm- & vfs- imposed limits */
3439         if (res > upper_limit)
3440                 res = upper_limit;
3441
3442         return res;
3443 }
3444
3445 /*
3446  * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
3447  * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
3448  * We need to be 1 filesystem block less than the 2^48 sector limit.
3449  */
3450 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
3451 {
3452         loff_t upper_limit, res = EXT4_NDIR_BLOCKS;
3453         int meta_blocks;
3454         unsigned int ppb = 1 << (bits - 2);
3455
3456         /*
3457          * This is calculated to be the largest file size for a dense, block
3458          * mapped file such that the file's total number of 512-byte sectors,
3459          * including data and all indirect blocks, does not exceed (2^48 - 1).
3460          *
3461          * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
3462          * number of 512-byte sectors of the file.
3463          */
3464         if (!has_huge_files) {
3465                 /*
3466                  * !has_huge_files or implies that the inode i_block field
3467                  * represents total file blocks in 2^32 512-byte sectors ==
3468                  * size of vfs inode i_blocks * 8
3469                  */
3470                 upper_limit = (1LL << 32) - 1;
3471
3472                 /* total blocks in file system block size */
3473                 upper_limit >>= (bits - 9);
3474
3475         } else {
3476                 /*
3477                  * We use 48 bit ext4_inode i_blocks
3478                  * With EXT4_HUGE_FILE_FL set the i_blocks
3479                  * represent total number of blocks in
3480                  * file system block size
3481                  */
3482                 upper_limit = (1LL << 48) - 1;
3483
3484         }
3485
3486         /* Compute how many blocks we can address by block tree */
3487         res += ppb;
3488         res += ppb * ppb;
3489         res += ((loff_t)ppb) * ppb * ppb;
3490         /* Compute how many metadata blocks are needed */
3491         meta_blocks = 1;
3492         meta_blocks += 1 + ppb;
3493         meta_blocks += 1 + ppb + ppb * ppb;
3494         /* Does block tree limit file size? */
3495         if (res + meta_blocks <= upper_limit)
3496                 goto check_lfs;
3497
3498         res = upper_limit;
3499         /* How many metadata blocks are needed for addressing upper_limit? */
3500         upper_limit -= EXT4_NDIR_BLOCKS;
3501         /* indirect blocks */
3502         meta_blocks = 1;
3503         upper_limit -= ppb;
3504         /* double indirect blocks */
3505         if (upper_limit < ppb * ppb) {
3506                 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb);
3507                 res -= meta_blocks;
3508                 goto check_lfs;
3509         }
3510         meta_blocks += 1 + ppb;
3511         upper_limit -= ppb * ppb;
3512         /* tripple indirect blocks for the rest */
3513         meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb) +
3514                 DIV_ROUND_UP_ULL(upper_limit, ppb*ppb);
3515         res -= meta_blocks;
3516 check_lfs:
3517         res <<= bits;
3518         if (res > MAX_LFS_FILESIZE)
3519                 res = MAX_LFS_FILESIZE;
3520
3521         return res;
3522 }
3523
3524 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
3525                                    ext4_fsblk_t logical_sb_block, int nr)
3526 {
3527         struct ext4_sb_info *sbi = EXT4_SB(sb);
3528         ext4_group_t bg, first_meta_bg;
3529         int has_super = 0;
3530
3531         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
3532
3533         if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
3534                 return logical_sb_block + nr + 1;
3535         bg = sbi->s_desc_per_block * nr;
3536         if (ext4_bg_has_super(sb, bg))
3537                 has_super = 1;
3538
3539         /*
3540          * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
3541          * block 2, not 1.  If s_first_data_block == 0 (bigalloc is enabled
3542          * on modern mke2fs or blksize > 1k on older mke2fs) then we must
3543          * compensate.
3544          */
3545         if (sb->s_blocksize == 1024 && nr == 0 &&
3546             le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
3547                 has_super++;
3548
3549         return (has_super + ext4_group_first_block_no(sb, bg));
3550 }
3551
3552 /**
3553  * ext4_get_stripe_size: Get the stripe size.
3554  * @sbi: In memory super block info
3555  *
3556  * If we have specified it via mount option, then
3557  * use the mount option value. If the value specified at mount time is
3558  * greater than the blocks per group use the super block value.
3559  * If the super block value is greater than blocks per group return 0.
3560  * Allocator needs it be less than blocks per group.
3561  *
3562  */
3563 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
3564 {
3565         unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
3566         unsigned long stripe_width =
3567                         le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3568         int ret;
3569
3570         if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3571                 ret = sbi->s_stripe;
3572         else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3573                 ret = stripe_width;
3574         else if (stride && stride <= sbi->s_blocks_per_group)
3575                 ret = stride;
3576         else
3577                 ret = 0;
3578
3579         /*
3580          * If the stripe width is 1, this makes no sense and
3581          * we set it to 0 to turn off stripe handling code.
3582          */
3583         if (ret <= 1)
3584                 ret = 0;
3585
3586         return ret;
3587 }
3588
3589 /*
3590  * Check whether this filesystem can be mounted based on
3591  * the features present and the RDONLY/RDWR mount requested.
3592  * Returns 1 if this filesystem can be mounted as requested,
3593  * 0 if it cannot be.
3594  */
3595 int ext4_feature_set_ok(struct super_block *sb, int readonly)
3596 {
3597         if (ext4_has_unknown_ext4_incompat_features(sb)) {
3598                 ext4_msg(sb, KERN_ERR,
3599                         "Couldn't mount because of "
3600                         "unsupported optional features (%x)",
3601                         (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
3602                         ~EXT4_FEATURE_INCOMPAT_SUPP));
3603                 return 0;
3604         }
3605
3606 #if !IS_ENABLED(CONFIG_UNICODE)
3607         if (ext4_has_feature_casefold(sb)) {
3608                 ext4_msg(sb, KERN_ERR,
3609                          "Filesystem with casefold feature cannot be "
3610                          "mounted without CONFIG_UNICODE");
3611                 return 0;
3612         }
3613 #endif
3614
3615         if (readonly)
3616                 return 1;
3617
3618         if (ext4_has_feature_readonly(sb)) {
3619                 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
3620                 sb->s_flags |= SB_RDONLY;
3621                 return 1;
3622         }
3623
3624         /* Check that feature set is OK for a read-write mount */
3625         if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
3626                 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3627                          "unsupported optional features (%x)",
3628                          (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3629                                 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3630                 return 0;
3631         }
3632         if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
3633                 ext4_msg(sb, KERN_ERR,
3634                          "Can't support bigalloc feature without "
3635                          "extents feature\n");
3636                 return 0;
3637         }
3638
3639 #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
3640         if (!readonly && (ext4_has_feature_quota(sb) ||
3641                           ext4_has_feature_project(sb))) {
3642                 ext4_msg(sb, KERN_ERR,
3643                          "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
3644                 return 0;
3645         }
3646 #endif  /* CONFIG_QUOTA */
3647         return 1;
3648 }
3649
3650 /*
3651  * This function is called once a day if we have errors logged
3652  * on the file system
3653  */
3654 static void print_daily_error_info(struct timer_list *t)
3655 {
3656         struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3657         struct super_block *sb = sbi->s_sb;
3658         struct ext4_super_block *es = sbi->s_es;
3659
3660         if (es->s_error_count)
3661                 /* fsck newer than v1.41.13 is needed to clean this condition. */
3662                 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
3663                          le32_to_cpu(es->s_error_count));
3664         if (es->s_first_error_time) {
3665                 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3666                        sb->s_id,
3667                        ext4_get_tstamp(es, s_first_error_time),
3668                        (int) sizeof(es->s_first_error_func),
3669                        es->s_first_error_func,
3670                        le32_to_cpu(es->s_first_error_line));
3671                 if (es->s_first_error_ino)
3672                         printk(KERN_CONT ": inode %u",
3673                                le32_to_cpu(es->s_first_error_ino));
3674                 if (es->s_first_error_block)
3675                         printk(KERN_CONT ": block %llu", (unsigned long long)
3676                                le64_to_cpu(es->s_first_error_block));
3677                 printk(KERN_CONT "\n");
3678         }
3679         if (es->s_last_error_time) {
3680                 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3681                        sb->s_id,
3682                        ext4_get_tstamp(es, s_last_error_time),
3683                        (int) sizeof(es->s_last_error_func),
3684                        es->s_last_error_func,
3685                        le32_to_cpu(es->s_last_error_line));
3686                 if (es->s_last_error_ino)
3687                         printk(KERN_CONT ": inode %u",
3688                                le32_to_cpu(es->s_last_error_ino));
3689                 if (es->s_last_error_block)
3690                         printk(KERN_CONT ": block %llu", (unsigned long long)
3691                                le64_to_cpu(es->s_last_error_block));
3692                 printk(KERN_CONT "\n");
3693         }
3694         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
3695 }
3696
3697 /* Find next suitable group and run ext4_init_inode_table */
3698 static int ext4_run_li_request(struct ext4_li_request *elr)
3699 {
3700         struct ext4_group_desc *gdp = NULL;
3701         struct super_block *sb = elr->lr_super;
3702         ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3703         ext4_group_t group = elr->lr_next_group;
3704         unsigned int prefetch_ios = 0;
3705         int ret = 0;
3706         int nr = EXT4_SB(sb)->s_mb_prefetch;
3707         u64 start_time;
3708
3709         if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) {
3710                 elr->lr_next_group = ext4_mb_prefetch(sb, group, nr, &prefetch_ios);
3711                 ext4_mb_prefetch_fini(sb, elr->lr_next_group, nr);
3712                 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group, nr);
3713                 if (group >= elr->lr_next_group) {
3714                         ret = 1;
3715                         if (elr->lr_first_not_zeroed != ngroups &&
3716                             !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) {
3717                                 elr->lr_next_group = elr->lr_first_not_zeroed;
3718                                 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3719                                 ret = 0;
3720                         }
3721                 }
3722                 return ret;
3723         }
3724
3725         for (; group < ngroups; group++) {
3726                 gdp = ext4_get_group_desc(sb, group, NULL);
3727                 if (!gdp) {
3728                         ret = 1;
3729                         break;
3730                 }
3731
3732                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3733                         break;
3734         }
3735
3736         if (group >= ngroups)
3737                 ret = 1;
3738
3739         if (!ret) {
3740                 start_time = ktime_get_real_ns();
3741                 ret = ext4_init_inode_table(sb, group,
3742                                             elr->lr_timeout ? 0 : 1);
3743                 trace_ext4_lazy_itable_init(sb, group);
3744                 if (elr->lr_timeout == 0) {
3745                         elr->lr_timeout = nsecs_to_jiffies((ktime_get_real_ns() - start_time) *
3746                                 EXT4_SB(elr->lr_super)->s_li_wait_mult);
3747                 }
3748                 elr->lr_next_sched = jiffies + elr->lr_timeout;
3749                 elr->lr_next_group = group + 1;
3750         }
3751         return ret;
3752 }
3753
3754 /*
3755  * Remove lr_request from the list_request and free the
3756  * request structure. Should be called with li_list_mtx held
3757  */
3758 static void ext4_remove_li_request(struct ext4_li_request *elr)
3759 {
3760         if (!elr)
3761                 return;
3762
3763         list_del(&elr->lr_request);
3764         EXT4_SB(elr->lr_super)->s_li_request = NULL;
3765         kfree(elr);
3766 }
3767
3768 static void ext4_unregister_li_request(struct super_block *sb)
3769 {
3770         mutex_lock(&ext4_li_mtx);
3771         if (!ext4_li_info) {
3772                 mutex_unlock(&ext4_li_mtx);
3773                 return;
3774         }
3775
3776         mutex_lock(&ext4_li_info->li_list_mtx);
3777         ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
3778         mutex_unlock(&ext4_li_info->li_list_mtx);
3779         mutex_unlock(&ext4_li_mtx);
3780 }
3781
3782 static struct task_struct *ext4_lazyinit_task;
3783
3784 /*
3785  * This is the function where ext4lazyinit thread lives. It walks
3786  * through the request list searching for next scheduled filesystem.
3787  * When such a fs is found, run the lazy initialization request
3788  * (ext4_rn_li_request) and keep track of the time spend in this
3789  * function. Based on that time we compute next schedule time of
3790  * the request. When walking through the list is complete, compute
3791  * next waking time and put itself into sleep.
3792  */
3793 static int ext4_lazyinit_thread(void *arg)
3794 {
3795         struct ext4_lazy_init *eli = arg;
3796         struct list_head *pos, *n;
3797         struct ext4_li_request *elr;
3798         unsigned long next_wakeup, cur;
3799
3800         BUG_ON(NULL == eli);
3801         set_freezable();
3802
3803 cont_thread:
3804         while (true) {
3805                 next_wakeup = MAX_JIFFY_OFFSET;
3806
3807                 mutex_lock(&eli->li_list_mtx);
3808                 if (list_empty(&eli->li_request_list)) {
3809                         mutex_unlock(&eli->li_list_mtx);
3810                         goto exit_thread;
3811                 }
3812                 list_for_each_safe(pos, n, &eli->li_request_list) {
3813                         int err = 0;
3814                         int progress = 0;
3815                         elr = list_entry(pos, struct ext4_li_request,
3816                                          lr_request);
3817
3818                         if (time_before(jiffies, elr->lr_next_sched)) {
3819                                 if (time_before(elr->lr_next_sched, next_wakeup))
3820                                         next_wakeup = elr->lr_next_sched;
3821                                 continue;
3822                         }
3823                         if (down_read_trylock(&elr->lr_super->s_umount)) {
3824                                 if (sb_start_write_trylock(elr->lr_super)) {
3825                                         progress = 1;
3826                                         /*
3827                                          * We hold sb->s_umount, sb can not
3828                                          * be removed from the list, it is
3829                                          * now safe to drop li_list_mtx
3830                                          */
3831                                         mutex_unlock(&eli->li_list_mtx);
3832                                         err = ext4_run_li_request(elr);
3833                                         sb_end_write(elr->lr_super);
3834                                         mutex_lock(&eli->li_list_mtx);
3835                                         n = pos->next;
3836                                 }
3837                                 up_read((&elr->lr_super->s_umount));
3838                         }
3839                         /* error, remove the lazy_init job */
3840                         if (err) {
3841                                 ext4_remove_li_request(elr);
3842                                 continue;
3843                         }
3844                         if (!progress) {
3845                                 elr->lr_next_sched = jiffies +
3846                                         get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);
3847                         }
3848                         if (time_before(elr->lr_next_sched, next_wakeup))
3849                                 next_wakeup = elr->lr_next_sched;
3850                 }
3851                 mutex_unlock(&eli->li_list_mtx);
3852
3853                 try_to_freeze();
3854
3855                 cur = jiffies;
3856                 if ((time_after_eq(cur, next_wakeup)) ||
3857                     (MAX_JIFFY_OFFSET == next_wakeup)) {
3858                         cond_resched();
3859                         continue;
3860                 }
3861
3862                 schedule_timeout_interruptible(next_wakeup - cur);
3863
3864                 if (kthread_should_stop()) {
3865                         ext4_clear_request_list();
3866                         goto exit_thread;
3867                 }
3868         }
3869
3870 exit_thread:
3871         /*
3872          * It looks like the request list is empty, but we need
3873          * to check it under the li_list_mtx lock, to prevent any
3874          * additions into it, and of course we should lock ext4_li_mtx
3875          * to atomically free the list and ext4_li_info, because at
3876          * this point another ext4 filesystem could be registering
3877          * new one.
3878          */
3879         mutex_lock(&ext4_li_mtx);
3880         mutex_lock(&eli->li_list_mtx);
3881         if (!list_empty(&eli->li_request_list)) {
3882                 mutex_unlock(&eli->li_list_mtx);
3883                 mutex_unlock(&ext4_li_mtx);
3884                 goto cont_thread;
3885         }
3886         mutex_unlock(&eli->li_list_mtx);
3887         kfree(ext4_li_info);
3888         ext4_li_info = NULL;
3889         mutex_unlock(&ext4_li_mtx);
3890
3891         return 0;
3892 }
3893
3894 static void ext4_clear_request_list(void)
3895 {
3896         struct list_head *pos, *n;
3897         struct ext4_li_request *elr;
3898
3899         mutex_lock(&ext4_li_info->li_list_mtx);
3900         list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3901                 elr = list_entry(pos, struct ext4_li_request,
3902                                  lr_request);
3903                 ext4_remove_li_request(elr);
3904         }
3905         mutex_unlock(&ext4_li_info->li_list_mtx);
3906 }
3907
3908 static int ext4_run_lazyinit_thread(void)
3909 {
3910         ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3911                                          ext4_li_info, "ext4lazyinit");
3912         if (IS_ERR(ext4_lazyinit_task)) {
3913                 int err = PTR_ERR(ext4_lazyinit_task);
3914                 ext4_clear_request_list();
3915                 kfree(ext4_li_info);
3916                 ext4_li_info = NULL;
3917                 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3918                                  "initialization thread\n",
3919                                  err);
3920                 return err;
3921         }
3922         ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3923         return 0;
3924 }
3925
3926 /*
3927  * Check whether it make sense to run itable init. thread or not.
3928  * If there is at least one uninitialized inode table, return
3929  * corresponding group number, else the loop goes through all
3930  * groups and return total number of groups.
3931  */
3932 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3933 {
3934         ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3935         struct ext4_group_desc *gdp = NULL;
3936
3937         if (!ext4_has_group_desc_csum(sb))
3938                 return ngroups;
3939
3940         for (group = 0; group < ngroups; group++) {
3941                 gdp = ext4_get_group_desc(sb, group, NULL);
3942                 if (!gdp)
3943                         continue;
3944
3945                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3946                         break;
3947         }
3948
3949         return group;
3950 }
3951
3952 static int ext4_li_info_new(void)
3953 {
3954         struct ext4_lazy_init *eli = NULL;
3955
3956         eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3957         if (!eli)
3958                 return -ENOMEM;
3959
3960         INIT_LIST_HEAD(&eli->li_request_list);
3961         mutex_init(&eli->li_list_mtx);
3962
3963         eli->li_state |= EXT4_LAZYINIT_QUIT;
3964
3965         ext4_li_info = eli;
3966
3967         return 0;
3968 }
3969
3970 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3971                                             ext4_group_t start)
3972 {
3973         struct ext4_li_request *elr;
3974
3975         elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3976         if (!elr)
3977                 return NULL;
3978
3979         elr->lr_super = sb;
3980         elr->lr_first_not_zeroed = start;
3981         if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) {
3982                 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3983                 elr->lr_next_group = start;
3984         } else {
3985                 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
3986         }
3987
3988         /*
3989          * Randomize first schedule time of the request to
3990          * spread the inode table initialization requests
3991          * better.
3992          */
3993         elr->lr_next_sched = jiffies + get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);
3994         return elr;
3995 }
3996
3997 int ext4_register_li_request(struct super_block *sb,
3998                              ext4_group_t first_not_zeroed)
3999 {
4000         struct ext4_sb_info *sbi = EXT4_SB(sb);
4001         struct ext4_li_request *elr = NULL;
4002         ext4_group_t ngroups = sbi->s_groups_count;
4003         int ret = 0;
4004
4005         mutex_lock(&ext4_li_mtx);
4006         if (sbi->s_li_request != NULL) {
4007                 /*
4008                  * Reset timeout so it can be computed again, because
4009                  * s_li_wait_mult might have changed.
4010                  */
4011                 sbi->s_li_request->lr_timeout = 0;
4012                 goto out;
4013         }
4014
4015         if (sb_rdonly(sb) ||
4016             (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
4017              (first_not_zeroed == ngroups || !test_opt(sb, INIT_INODE_TABLE))))
4018                 goto out;
4019
4020         elr = ext4_li_request_new(sb, first_not_zeroed);
4021         if (!elr) {
4022                 ret = -ENOMEM;
4023                 goto out;
4024         }
4025
4026         if (NULL == ext4_li_info) {
4027                 ret = ext4_li_info_new();
4028                 if (ret)
4029                         goto out;
4030         }
4031
4032         mutex_lock(&ext4_li_info->li_list_mtx);
4033         list_add(&elr->lr_request, &ext4_li_info->li_request_list);
4034         mutex_unlock(&ext4_li_info->li_list_mtx);
4035
4036         sbi->s_li_request = elr;
4037         /*
4038          * set elr to NULL here since it has been inserted to
4039          * the request_list and the removal and free of it is
4040          * handled by ext4_clear_request_list from now on.
4041          */
4042         elr = NULL;
4043
4044         if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
4045                 ret = ext4_run_lazyinit_thread();
4046                 if (ret)
4047                         goto out;
4048         }
4049 out:
4050         mutex_unlock(&ext4_li_mtx);
4051         if (ret)
4052                 kfree(elr);
4053         return ret;
4054 }
4055
4056 /*
4057  * We do not need to lock anything since this is called on
4058  * module unload.
4059  */
4060 static void ext4_destroy_lazyinit_thread(void)
4061 {
4062         /*
4063          * If thread exited earlier
4064          * there's nothing to be done.
4065          */
4066         if (!ext4_li_info || !ext4_lazyinit_task)
4067                 return;
4068
4069         kthread_stop(ext4_lazyinit_task);
4070 }
4071
4072 static int set_journal_csum_feature_set(struct super_block *sb)
4073 {
4074         int ret = 1;
4075         int compat, incompat;
4076         struct ext4_sb_info *sbi = EXT4_SB(sb);
4077
4078         if (ext4_has_metadata_csum(sb)) {
4079                 /* journal checksum v3 */
4080                 compat = 0;
4081                 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
4082         } else {
4083                 /* journal checksum v1 */
4084                 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
4085                 incompat = 0;
4086         }
4087
4088         jbd2_journal_clear_features(sbi->s_journal,
4089                         JBD2_FEATURE_COMPAT_CHECKSUM, 0,
4090                         JBD2_FEATURE_INCOMPAT_CSUM_V3 |
4091                         JBD2_FEATURE_INCOMPAT_CSUM_V2);
4092         if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4093                 ret = jbd2_journal_set_features(sbi->s_journal,
4094                                 compat, 0,
4095                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
4096                                 incompat);
4097         } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
4098                 ret = jbd2_journal_set_features(sbi->s_journal,
4099                                 compat, 0,
4100                                 incompat);
4101                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4102                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
4103         } else {
4104                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4105                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
4106         }
4107
4108         return ret;
4109 }
4110
4111 /*
4112  * Note: calculating the overhead so we can be compatible with
4113  * historical BSD practice is quite difficult in the face of
4114  * clusters/bigalloc.  This is because multiple metadata blocks from
4115  * different block group can end up in the same allocation cluster.
4116  * Calculating the exact overhead in the face of clustered allocation
4117  * requires either O(all block bitmaps) in memory or O(number of block
4118  * groups**2) in time.  We will still calculate the superblock for
4119  * older file systems --- and if we come across with a bigalloc file
4120  * system with zero in s_overhead_clusters the estimate will be close to
4121  * correct especially for very large cluster sizes --- but for newer
4122  * file systems, it's better to calculate this figure once at mkfs
4123  * time, and store it in the superblock.  If the superblock value is
4124  * present (even for non-bigalloc file systems), we will use it.
4125  */
4126 static int count_overhead(struct super_block *sb, ext4_group_t grp,
4127                           char *buf)
4128 {
4129         struct ext4_sb_info     *sbi = EXT4_SB(sb);
4130         struct ext4_group_desc  *gdp;
4131         ext4_fsblk_t            first_block, last_block, b;
4132         ext4_group_t            i, ngroups = ext4_get_groups_count(sb);
4133         int                     s, j, count = 0;
4134         int                     has_super = ext4_bg_has_super(sb, grp);
4135
4136         if (!ext4_has_feature_bigalloc(sb))
4137                 return (has_super + ext4_bg_num_gdb(sb, grp) +
4138                         (has_super ? le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0) +
4139                         sbi->s_itb_per_group + 2);
4140
4141         first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
4142                 (grp * EXT4_BLOCKS_PER_GROUP(sb));
4143         last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
4144         for (i = 0; i < ngroups; i++) {
4145                 gdp = ext4_get_group_desc(sb, i, NULL);
4146                 b = ext4_block_bitmap(sb, gdp);
4147                 if (b >= first_block && b <= last_block) {
4148                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4149                         count++;
4150                 }
4151                 b = ext4_inode_bitmap(sb, gdp);
4152                 if (b >= first_block && b <= last_block) {
4153                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4154                         count++;
4155                 }
4156                 b = ext4_inode_table(sb, gdp);
4157                 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
4158                         for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
4159                                 int c = EXT4_B2C(sbi, b - first_block);
4160                                 ext4_set_bit(c, buf);
4161                                 count++;
4162                         }
4163                 if (i != grp)
4164                         continue;
4165                 s = 0;
4166                 if (ext4_bg_has_super(sb, grp)) {
4167                         ext4_set_bit(s++, buf);
4168                         count++;
4169                 }
4170                 j = ext4_bg_num_gdb(sb, grp);
4171                 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
4172                         ext4_error(sb, "Invalid number of block group "
4173                                    "descriptor blocks: %d", j);
4174                         j = EXT4_BLOCKS_PER_GROUP(sb) - s;
4175                 }
4176                 count += j;
4177                 for (; j > 0; j--)
4178                         ext4_set_bit(EXT4_B2C(sbi, s++), buf);
4179         }
4180         if (!count)
4181                 return 0;
4182         return EXT4_CLUSTERS_PER_GROUP(sb) -
4183                 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
4184 }
4185
4186 /*
4187  * Compute the overhead and stash it in sbi->s_overhead
4188  */
4189 int ext4_calculate_overhead(struct super_block *sb)
4190 {
4191         struct ext4_sb_info *sbi = EXT4_SB(sb);
4192         struct ext4_super_block *es = sbi->s_es;
4193         struct inode *j_inode;
4194         unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
4195         ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4196         ext4_fsblk_t overhead = 0;
4197         char *buf = (char *) get_zeroed_page(GFP_NOFS);
4198
4199         if (!buf)
4200                 return -ENOMEM;
4201
4202         /*
4203          * Compute the overhead (FS structures).  This is constant
4204          * for a given filesystem unless the number of block groups
4205          * changes so we cache the previous value until it does.
4206          */
4207
4208         /*
4209          * All of the blocks before first_data_block are overhead
4210          */
4211         overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
4212
4213         /*
4214          * Add the overhead found in each block group
4215          */
4216         for (i = 0; i < ngroups; i++) {
4217                 int blks;
4218
4219                 blks = count_overhead(sb, i, buf);
4220                 overhead += blks;
4221                 if (blks)
4222                         memset(buf, 0, PAGE_SIZE);
4223                 cond_resched();
4224         }
4225
4226         /*
4227          * Add the internal journal blocks whether the journal has been
4228          * loaded or not
4229          */
4230         if (sbi->s_journal && !sbi->s_journal_bdev)
4231                 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len);
4232         else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
4233                 /* j_inum for internal journal is non-zero */
4234                 j_inode = ext4_get_journal_inode(sb, j_inum);
4235                 if (j_inode) {
4236                         j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
4237                         overhead += EXT4_NUM_B2C(sbi, j_blocks);
4238                         iput(j_inode);
4239                 } else {
4240                         ext4_msg(sb, KERN_ERR, "can't get journal size");
4241                 }
4242         }
4243         sbi->s_overhead = overhead;
4244         smp_wmb();
4245         free_page((unsigned long) buf);
4246         return 0;
4247 }
4248
4249 static void ext4_set_resv_clusters(struct super_block *sb)
4250 {
4251         ext4_fsblk_t resv_clusters;
4252         struct ext4_sb_info *sbi = EXT4_SB(sb);
4253
4254         /*
4255          * There's no need to reserve anything when we aren't using extents.
4256          * The space estimates are exact, there are no unwritten extents,
4257          * hole punching doesn't need new metadata... This is needed especially
4258          * to keep ext2/3 backward compatibility.
4259          */
4260         if (!ext4_has_feature_extents(sb))
4261                 return;
4262         /*
4263          * By default we reserve 2% or 4096 clusters, whichever is smaller.
4264          * This should cover the situations where we can not afford to run
4265          * out of space like for example punch hole, or converting
4266          * unwritten extents in delalloc path. In most cases such
4267          * allocation would require 1, or 2 blocks, higher numbers are
4268          * very rare.
4269          */
4270         resv_clusters = (ext4_blocks_count(sbi->s_es) >>
4271                          sbi->s_cluster_bits);
4272
4273         do_div(resv_clusters, 50);
4274         resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
4275
4276         atomic64_set(&sbi->s_resv_clusters, resv_clusters);
4277 }
4278
4279 static const char *ext4_quota_mode(struct super_block *sb)
4280 {
4281 #ifdef CONFIG_QUOTA
4282         if (!ext4_quota_capable(sb))
4283                 return "none";
4284
4285         if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb))
4286                 return "journalled";
4287         else
4288                 return "writeback";
4289 #else
4290         return "disabled";
4291 #endif
4292 }
4293
4294 static void ext4_setup_csum_trigger(struct super_block *sb,
4295                                     enum ext4_journal_trigger_type type,
4296                                     void (*trigger)(
4297                                         struct jbd2_buffer_trigger_type *type,
4298                                         struct buffer_head *bh,
4299                                         void *mapped_data,
4300                                         size_t size))
4301 {
4302         struct ext4_sb_info *sbi = EXT4_SB(sb);
4303
4304         sbi->s_journal_triggers[type].sb = sb;
4305         sbi->s_journal_triggers[type].tr_triggers.t_frozen = trigger;
4306 }
4307
4308 static void ext4_free_sbi(struct ext4_sb_info *sbi)
4309 {
4310         if (!sbi)
4311                 return;
4312
4313         kfree(sbi->s_blockgroup_lock);
4314         fs_put_dax(sbi->s_daxdev, NULL);
4315         kfree(sbi);
4316 }
4317
4318 static struct ext4_sb_info *ext4_alloc_sbi(struct super_block *sb)
4319 {
4320         struct ext4_sb_info *sbi;
4321
4322         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
4323         if (!sbi)
4324                 return NULL;
4325
4326         sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off,
4327                                            NULL, NULL);
4328
4329         sbi->s_blockgroup_lock =
4330                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
4331
4332         if (!sbi->s_blockgroup_lock)
4333                 goto err_out;
4334
4335         sb->s_fs_info = sbi;
4336         sbi->s_sb = sb;
4337         return sbi;
4338 err_out:
4339         fs_put_dax(sbi->s_daxdev, NULL);
4340         kfree(sbi);
4341         return NULL;
4342 }
4343
4344 static void ext4_set_def_opts(struct super_block *sb,
4345                               struct ext4_super_block *es)
4346 {
4347         unsigned long def_mount_opts;
4348
4349         /* Set defaults before we parse the mount options */
4350         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
4351         set_opt(sb, INIT_INODE_TABLE);
4352         if (def_mount_opts & EXT4_DEFM_DEBUG)
4353                 set_opt(sb, DEBUG);
4354         if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
4355                 set_opt(sb, GRPID);
4356         if (def_mount_opts & EXT4_DEFM_UID16)
4357                 set_opt(sb, NO_UID32);
4358         /* xattr user namespace & acls are now defaulted on */
4359         set_opt(sb, XATTR_USER);
4360 #ifdef CONFIG_EXT4_FS_POSIX_ACL
4361         set_opt(sb, POSIX_ACL);
4362 #endif
4363         if (ext4_has_feature_fast_commit(sb))
4364                 set_opt2(sb, JOURNAL_FAST_COMMIT);
4365         /* don't forget to enable journal_csum when metadata_csum is enabled. */
4366         if (ext4_has_metadata_csum(sb))
4367                 set_opt(sb, JOURNAL_CHECKSUM);
4368
4369         if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
4370                 set_opt(sb, JOURNAL_DATA);
4371         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
4372                 set_opt(sb, ORDERED_DATA);
4373         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
4374                 set_opt(sb, WRITEBACK_DATA);
4375
4376         if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_PANIC)
4377                 set_opt(sb, ERRORS_PANIC);
4378         else if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_CONTINUE)
4379                 set_opt(sb, ERRORS_CONT);
4380         else
4381                 set_opt(sb, ERRORS_RO);
4382         /* block_validity enabled by default; disable with noblock_validity */
4383         set_opt(sb, BLOCK_VALIDITY);
4384         if (def_mount_opts & EXT4_DEFM_DISCARD)
4385                 set_opt(sb, DISCARD);
4386
4387         if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
4388                 set_opt(sb, BARRIER);
4389
4390         /*
4391          * enable delayed allocation by default
4392          * Use -o nodelalloc to turn it off
4393          */
4394         if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
4395             ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
4396                 set_opt(sb, DELALLOC);
4397
4398         if (sb->s_blocksize == PAGE_SIZE)
4399                 set_opt(sb, DIOREAD_NOLOCK);
4400 }
4401
4402 static int ext4_handle_clustersize(struct super_block *sb)
4403 {
4404         struct ext4_sb_info *sbi = EXT4_SB(sb);
4405         struct ext4_super_block *es = sbi->s_es;
4406         int clustersize;
4407
4408         /* Handle clustersize */
4409         clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4410         if (ext4_has_feature_bigalloc(sb)) {
4411                 if (clustersize < sb->s_blocksize) {
4412                         ext4_msg(sb, KERN_ERR,
4413                                  "cluster size (%d) smaller than "
4414                                  "block size (%lu)", clustersize, sb->s_blocksize);
4415                         return -EINVAL;
4416                 }
4417                 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4418                         le32_to_cpu(es->s_log_block_size);
4419                 sbi->s_clusters_per_group =
4420                         le32_to_cpu(es->s_clusters_per_group);
4421                 if (sbi->s_clusters_per_group > sb->s_blocksize * 8) {
4422                         ext4_msg(sb, KERN_ERR,
4423                                  "#clusters per group too big: %lu",
4424                                  sbi->s_clusters_per_group);
4425                         return -EINVAL;
4426                 }
4427                 if (sbi->s_blocks_per_group !=
4428                     (sbi->s_clusters_per_group * (clustersize / sb->s_blocksize))) {
4429                         ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4430                                  "clusters per group (%lu) inconsistent",
4431                                  sbi->s_blocks_per_group,
4432                                  sbi->s_clusters_per_group);
4433                         return -EINVAL;
4434                 }
4435         } else {
4436                 if (clustersize != sb->s_blocksize) {
4437                         ext4_msg(sb, KERN_ERR,
4438                                  "fragment/cluster size (%d) != "
4439                                  "block size (%lu)", clustersize, sb->s_blocksize);
4440                         return -EINVAL;
4441                 }
4442                 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
4443                         ext4_msg(sb, KERN_ERR,
4444                                  "#blocks per group too big: %lu",
4445                                  sbi->s_blocks_per_group);
4446                         return -EINVAL;
4447                 }
4448                 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4449                 sbi->s_cluster_bits = 0;
4450         }
4451         sbi->s_cluster_ratio = clustersize / sb->s_blocksize;
4452
4453         /* Do we have standard group size of clustersize * 8 blocks ? */
4454         if (sbi->s_blocks_per_group == clustersize << 3)
4455                 set_opt2(sb, STD_GROUP_SIZE);
4456
4457         return 0;
4458 }
4459
4460 static void ext4_fast_commit_init(struct super_block *sb)
4461 {
4462         struct ext4_sb_info *sbi = EXT4_SB(sb);
4463
4464         /* Initialize fast commit stuff */
4465         atomic_set(&sbi->s_fc_subtid, 0);
4466         INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]);
4467         INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]);
4468         INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);
4469         INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);
4470         sbi->s_fc_bytes = 0;
4471         ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
4472         sbi->s_fc_ineligible_tid = 0;
4473         spin_lock_init(&sbi->s_fc_lock);
4474         memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));
4475         sbi->s_fc_replay_state.fc_regions = NULL;
4476         sbi->s_fc_replay_state.fc_regions_size = 0;
4477         sbi->s_fc_replay_state.fc_regions_used = 0;
4478         sbi->s_fc_replay_state.fc_regions_valid = 0;
4479         sbi->s_fc_replay_state.fc_modified_inodes = NULL;
4480         sbi->s_fc_replay_state.fc_modified_inodes_size = 0;
4481         sbi->s_fc_replay_state.fc_modified_inodes_used = 0;
4482 }
4483
4484 static int ext4_inode_info_init(struct super_block *sb,
4485                                 struct ext4_super_block *es)
4486 {
4487         struct ext4_sb_info *sbi = EXT4_SB(sb);
4488
4489         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4490                 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4491                 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
4492         } else {
4493                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4494                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
4495                 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4496                         ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4497                                  sbi->s_first_ino);
4498                         return -EINVAL;
4499                 }
4500                 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
4501                     (!is_power_of_2(sbi->s_inode_size)) ||
4502                     (sbi->s_inode_size > sb->s_blocksize)) {
4503                         ext4_msg(sb, KERN_ERR,
4504                                "unsupported inode size: %d",
4505                                sbi->s_inode_size);
4506                         ext4_msg(sb, KERN_ERR, "blocksize: %lu", sb->s_blocksize);
4507                         return -EINVAL;
4508                 }
4509                 /*
4510                  * i_atime_extra is the last extra field available for
4511                  * [acm]times in struct ext4_inode. Checking for that
4512                  * field should suffice to ensure we have extra space
4513                  * for all three.
4514                  */
4515                 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4516                         sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4517                         sb->s_time_gran = 1;
4518                         sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4519                 } else {
4520                         sb->s_time_gran = NSEC_PER_SEC;
4521                         sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4522                 }
4523                 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4524         }
4525
4526         if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4527                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4528                         EXT4_GOOD_OLD_INODE_SIZE;
4529                 if (ext4_has_feature_extra_isize(sb)) {
4530                         unsigned v, max = (sbi->s_inode_size -
4531                                            EXT4_GOOD_OLD_INODE_SIZE);
4532
4533                         v = le16_to_cpu(es->s_want_extra_isize);
4534                         if (v > max) {
4535                                 ext4_msg(sb, KERN_ERR,
4536                                          "bad s_want_extra_isize: %d", v);
4537                                 return -EINVAL;
4538                         }
4539                         if (sbi->s_want_extra_isize < v)
4540                                 sbi->s_want_extra_isize = v;
4541
4542                         v = le16_to_cpu(es->s_min_extra_isize);
4543                         if (v > max) {
4544                                 ext4_msg(sb, KERN_ERR,
4545                                          "bad s_min_extra_isize: %d", v);
4546                                 return -EINVAL;
4547                         }
4548                         if (sbi->s_want_extra_isize < v)
4549                                 sbi->s_want_extra_isize = v;
4550                 }
4551         }
4552
4553         return 0;
4554 }
4555
4556 #if IS_ENABLED(CONFIG_UNICODE)
4557 static int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)
4558 {
4559         const struct ext4_sb_encodings *encoding_info;
4560         struct unicode_map *encoding;
4561         __u16 encoding_flags = le16_to_cpu(es->s_encoding_flags);
4562
4563         if (!ext4_has_feature_casefold(sb) || sb->s_encoding)
4564                 return 0;
4565
4566         encoding_info = ext4_sb_read_encoding(es);
4567         if (!encoding_info) {
4568                 ext4_msg(sb, KERN_ERR,
4569                         "Encoding requested by superblock is unknown");
4570                 return -EINVAL;
4571         }
4572
4573         encoding = utf8_load(encoding_info->version);
4574         if (IS_ERR(encoding)) {
4575                 ext4_msg(sb, KERN_ERR,
4576                         "can't mount with superblock charset: %s-%u.%u.%u "
4577                         "not supported by the kernel. flags: 0x%x.",
4578                         encoding_info->name,
4579                         unicode_major(encoding_info->version),
4580                         unicode_minor(encoding_info->version),
4581                         unicode_rev(encoding_info->version),
4582                         encoding_flags);
4583                 return -EINVAL;
4584         }
4585         ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
4586                 "%s-%u.%u.%u with flags 0x%hx", encoding_info->name,
4587                 unicode_major(encoding_info->version),
4588                 unicode_minor(encoding_info->version),
4589                 unicode_rev(encoding_info->version),
4590                 encoding_flags);
4591
4592         sb->s_encoding = encoding;
4593         sb->s_encoding_flags = encoding_flags;
4594
4595         return 0;
4596 }
4597 #else
4598 static inline int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)
4599 {
4600         return 0;
4601 }
4602 #endif
4603
4604 static int ext4_init_metadata_csum(struct super_block *sb, struct ext4_super_block *es)
4605 {
4606         struct ext4_sb_info *sbi = EXT4_SB(sb);
4607
4608         /* Warn if metadata_csum and gdt_csum are both set. */
4609         if (ext4_has_feature_metadata_csum(sb) &&
4610             ext4_has_feature_gdt_csum(sb))
4611                 ext4_warning(sb, "metadata_csum and uninit_bg are "
4612                              "redundant flags; please run fsck.");
4613
4614         /* Check for a known checksum algorithm */
4615         if (!ext4_verify_csum_type(sb, es)) {
4616                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4617                          "unknown checksum algorithm.");
4618                 return -EINVAL;
4619         }
4620         ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
4621                                 ext4_orphan_file_block_trigger);
4622
4623         /* Load the checksum driver */
4624         sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
4625         if (IS_ERR(sbi->s_chksum_driver)) {
4626                 int ret = PTR_ERR(sbi->s_chksum_driver);
4627                 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
4628                 sbi->s_chksum_driver = NULL;
4629                 return ret;
4630         }
4631
4632         /* Check superblock checksum */
4633         if (!ext4_superblock_csum_verify(sb, es)) {
4634                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4635                          "invalid superblock checksum.  Run e2fsck?");
4636                 return -EFSBADCRC;
4637         }
4638
4639         /* Precompute checksum seed for all metadata */
4640         if (ext4_has_feature_csum_seed(sb))
4641                 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
4642         else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
4643                 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
4644                                                sizeof(es->s_uuid));
4645         return 0;
4646 }
4647
4648 static int ext4_check_feature_compatibility(struct super_block *sb,
4649                                             struct ext4_super_block *es,
4650                                             int silent)
4651 {
4652         struct ext4_sb_info *sbi = EXT4_SB(sb);
4653
4654         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
4655             (ext4_has_compat_features(sb) ||
4656              ext4_has_ro_compat_features(sb) ||
4657              ext4_has_incompat_features(sb)))
4658                 ext4_msg(sb, KERN_WARNING,
4659                        "feature flags set on rev 0 fs, "
4660                        "running e2fsck is recommended");
4661
4662         if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
4663                 set_opt2(sb, HURD_COMPAT);
4664                 if (ext4_has_feature_64bit(sb)) {
4665                         ext4_msg(sb, KERN_ERR,
4666                                  "The Hurd can't support 64-bit file systems");
4667                         return -EINVAL;
4668                 }
4669
4670                 /*
4671                  * ea_inode feature uses l_i_version field which is not
4672                  * available in HURD_COMPAT mode.
4673                  */
4674                 if (ext4_has_feature_ea_inode(sb)) {
4675                         ext4_msg(sb, KERN_ERR,
4676                                  "ea_inode feature is not supported for Hurd");
4677                         return -EINVAL;
4678                 }
4679         }
4680
4681         if (IS_EXT2_SB(sb)) {
4682                 if (ext2_feature_set_ok(sb))
4683                         ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4684                                  "using the ext4 subsystem");
4685                 else {
4686                         /*
4687                          * If we're probing be silent, if this looks like
4688                          * it's actually an ext[34] filesystem.
4689                          */
4690                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4691                                 return -EINVAL;
4692                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4693                                  "to feature incompatibilities");
4694                         return -EINVAL;
4695                 }
4696         }
4697
4698         if (IS_EXT3_SB(sb)) {
4699                 if (ext3_feature_set_ok(sb))
4700                         ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4701                                  "using the ext4 subsystem");
4702                 else {
4703                         /*
4704                          * If we're probing be silent, if this looks like
4705                          * it's actually an ext4 filesystem.
4706                          */
4707                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4708                                 return -EINVAL;
4709                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4710                                  "to feature incompatibilities");
4711                         return -EINVAL;
4712                 }
4713         }
4714
4715         /*
4716          * Check feature flags regardless of the revision level, since we
4717          * previously didn't change the revision level when setting the flags,
4718          * so there is a chance incompat flags are set on a rev 0 filesystem.
4719          */
4720         if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
4721                 return -EINVAL;
4722
4723         if (sbi->s_daxdev) {
4724                 if (sb->s_blocksize == PAGE_SIZE)
4725                         set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
4726                 else
4727                         ext4_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n");
4728         }
4729
4730         if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
4731                 if (ext4_has_feature_inline_data(sb)) {
4732                         ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4733                                         " that may contain inline data");
4734                         return -EINVAL;
4735                 }
4736                 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {
4737                         ext4_msg(sb, KERN_ERR,
4738                                 "DAX unsupported by block device.");
4739                         return -EINVAL;
4740                 }
4741         }
4742
4743         if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
4744                 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4745                          es->s_encryption_level);
4746                 return -EINVAL;
4747         }
4748
4749         return 0;
4750 }
4751
4752 static int ext4_check_geometry(struct super_block *sb,
4753                                struct ext4_super_block *es)
4754 {
4755         struct ext4_sb_info *sbi = EXT4_SB(sb);
4756         __u64 blocks_count;
4757         int err;
4758
4759         if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (sb->s_blocksize / 4)) {
4760                 ext4_msg(sb, KERN_ERR,
4761                          "Number of reserved GDT blocks insanely large: %d",
4762                          le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4763                 return -EINVAL;
4764         }
4765         /*
4766          * Test whether we have more sectors than will fit in sector_t,
4767          * and whether the max offset is addressable by the page cache.
4768          */
4769         err = generic_check_addressable(sb->s_blocksize_bits,
4770                                         ext4_blocks_count(es));
4771         if (err) {
4772                 ext4_msg(sb, KERN_ERR, "filesystem"
4773                          " too large to mount safely on this system");
4774                 return err;
4775         }
4776
4777         /* check blocks count against device size */
4778         blocks_count = sb_bdev_nr_blocks(sb);
4779         if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4780                 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4781                        "exceeds size of device (%llu blocks)",
4782                        ext4_blocks_count(es), blocks_count);
4783                 return -EINVAL;
4784         }
4785
4786         /*
4787          * It makes no sense for the first data block to be beyond the end
4788          * of the filesystem.
4789          */
4790         if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4791                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4792                          "block %u is beyond end of filesystem (%llu)",
4793                          le32_to_cpu(es->s_first_data_block),
4794                          ext4_blocks_count(es));
4795                 return -EINVAL;
4796         }
4797         if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4798             (sbi->s_cluster_ratio == 1)) {
4799                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4800                          "block is 0 with a 1k block and cluster size");
4801                 return -EINVAL;
4802         }
4803
4804         blocks_count = (ext4_blocks_count(es) -
4805                         le32_to_cpu(es->s_first_data_block) +
4806                         EXT4_BLOCKS_PER_GROUP(sb) - 1);
4807         do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4808         if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4809                 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4810                        "(block count %llu, first data block %u, "
4811                        "blocks per group %lu)", blocks_count,
4812                        ext4_blocks_count(es),
4813                        le32_to_cpu(es->s_first_data_block),
4814                        EXT4_BLOCKS_PER_GROUP(sb));
4815                 return -EINVAL;
4816         }
4817         sbi->s_groups_count = blocks_count;
4818         sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4819                         (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4820         if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4821             le32_to_cpu(es->s_inodes_count)) {
4822                 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4823                          le32_to_cpu(es->s_inodes_count),
4824                          ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4825                 return -EINVAL;
4826         }
4827
4828         return 0;
4829 }
4830
4831 static int ext4_group_desc_init(struct super_block *sb,
4832                                 struct ext4_super_block *es,
4833                                 ext4_fsblk_t logical_sb_block,
4834                                 ext4_group_t *first_not_zeroed)
4835 {
4836         struct ext4_sb_info *sbi = EXT4_SB(sb);
4837         unsigned int db_count;
4838         ext4_fsblk_t block;
4839         int i;
4840
4841         db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4842                    EXT4_DESC_PER_BLOCK(sb);
4843         if (ext4_has_feature_meta_bg(sb)) {
4844                 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4845                         ext4_msg(sb, KERN_WARNING,
4846                                  "first meta block group too large: %u "
4847                                  "(group descriptor block count %u)",
4848                                  le32_to_cpu(es->s_first_meta_bg), db_count);
4849                         return -EINVAL;
4850                 }
4851         }
4852         rcu_assign_pointer(sbi->s_group_desc,
4853                            kvmalloc_array(db_count,
4854                                           sizeof(struct buffer_head *),
4855                                           GFP_KERNEL));
4856         if (sbi->s_group_desc == NULL) {
4857                 ext4_msg(sb, KERN_ERR, "not enough memory");
4858                 return -ENOMEM;
4859         }
4860
4861         bgl_lock_init(sbi->s_blockgroup_lock);
4862
4863         /* Pre-read the descriptors into the buffer cache */
4864         for (i = 0; i < db_count; i++) {
4865                 block = descriptor_loc(sb, logical_sb_block, i);
4866                 ext4_sb_breadahead_unmovable(sb, block);
4867         }
4868
4869         for (i = 0; i < db_count; i++) {
4870                 struct buffer_head *bh;
4871
4872                 block = descriptor_loc(sb, logical_sb_block, i);
4873                 bh = ext4_sb_bread_unmovable(sb, block);
4874                 if (IS_ERR(bh)) {
4875                         ext4_msg(sb, KERN_ERR,
4876                                "can't read group descriptor %d", i);
4877                         sbi->s_gdb_count = i;
4878                         return PTR_ERR(bh);
4879                 }
4880                 rcu_read_lock();
4881                 rcu_dereference(sbi->s_group_desc)[i] = bh;
4882                 rcu_read_unlock();
4883         }
4884         sbi->s_gdb_count = db_count;
4885         if (!ext4_check_descriptors(sb, logical_sb_block, first_not_zeroed)) {
4886                 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4887                 return -EFSCORRUPTED;
4888         }
4889
4890         return 0;
4891 }
4892
4893 static int ext4_load_and_init_journal(struct super_block *sb,
4894                                       struct ext4_super_block *es,
4895                                       struct ext4_fs_context *ctx)
4896 {
4897         struct ext4_sb_info *sbi = EXT4_SB(sb);
4898         int err;
4899
4900         err = ext4_load_journal(sb, es, ctx->journal_devnum);
4901         if (err)
4902                 return err;
4903
4904         if (ext4_has_feature_64bit(sb) &&
4905             !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4906                                        JBD2_FEATURE_INCOMPAT_64BIT)) {
4907                 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4908                 goto out;
4909         }
4910
4911         if (!set_journal_csum_feature_set(sb)) {
4912                 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4913                          "feature set");
4914                 goto out;
4915         }
4916
4917         if (test_opt2(sb, JOURNAL_FAST_COMMIT) &&
4918                 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4919                                           JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) {
4920                 ext4_msg(sb, KERN_ERR,
4921                         "Failed to set fast commit journal feature");
4922                 goto out;
4923         }
4924
4925         /* We have now updated the journal if required, so we can
4926          * validate the data journaling mode. */
4927         switch (test_opt(sb, DATA_FLAGS)) {
4928         case 0:
4929                 /* No mode set, assume a default based on the journal
4930                  * capabilities: ORDERED_DATA if the journal can
4931                  * cope, else JOURNAL_DATA
4932                  */
4933                 if (jbd2_journal_check_available_features
4934                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4935                         set_opt(sb, ORDERED_DATA);
4936                         sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4937                 } else {
4938                         set_opt(sb, JOURNAL_DATA);
4939                         sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4940                 }
4941                 break;
4942
4943         case EXT4_MOUNT_ORDERED_DATA:
4944         case EXT4_MOUNT_WRITEBACK_DATA:
4945                 if (!jbd2_journal_check_available_features
4946                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4947                         ext4_msg(sb, KERN_ERR, "Journal does not support "
4948                                "requested data journaling mode");
4949                         goto out;
4950                 }
4951                 break;
4952         default:
4953                 break;
4954         }
4955
4956         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4957             test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4958                 ext4_msg(sb, KERN_ERR, "can't mount with "
4959                         "journal_async_commit in data=ordered mode");
4960                 goto out;
4961         }
4962
4963         set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
4964
4965         sbi->s_journal->j_submit_inode_data_buffers =
4966                 ext4_journal_submit_inode_data_buffers;
4967         sbi->s_journal->j_finish_inode_data_buffers =
4968                 ext4_journal_finish_inode_data_buffers;
4969
4970         return 0;
4971
4972 out:
4973         /* flush s_error_work before journal destroy. */
4974         flush_work(&sbi->s_error_work);
4975         jbd2_journal_destroy(sbi->s_journal);
4976         sbi->s_journal = NULL;
4977         return -EINVAL;
4978 }
4979
4980 static int ext4_check_journal_data_mode(struct super_block *sb)
4981 {
4982         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4983                 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with "
4984                             "data=journal disables delayed allocation, "
4985                             "dioread_nolock, O_DIRECT and fast_commit support!\n");
4986                 /* can't mount with both data=journal and dioread_nolock. */
4987                 clear_opt(sb, DIOREAD_NOLOCK);
4988                 clear_opt2(sb, JOURNAL_FAST_COMMIT);
4989                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4990                         ext4_msg(sb, KERN_ERR, "can't mount with "
4991                                  "both data=journal and delalloc");
4992                         return -EINVAL;
4993                 }
4994                 if (test_opt(sb, DAX_ALWAYS)) {
4995                         ext4_msg(sb, KERN_ERR, "can't mount with "
4996                                  "both data=journal and dax");
4997                         return -EINVAL;
4998                 }
4999                 if (ext4_has_feature_encrypt(sb)) {
5000                         ext4_msg(sb, KERN_WARNING,
5001                                  "encrypted files will use data=ordered "
5002                                  "instead of data journaling mode");
5003                 }
5004                 if (test_opt(sb, DELALLOC))
5005                         clear_opt(sb, DELALLOC);
5006         } else {
5007                 sb->s_iflags |= SB_I_CGROUPWB;
5008         }
5009
5010         return 0;
5011 }
5012
5013 static int ext4_load_super(struct super_block *sb, ext4_fsblk_t *lsb,
5014                            int silent)
5015 {
5016         struct ext4_sb_info *sbi = EXT4_SB(sb);
5017         struct ext4_super_block *es;
5018         ext4_fsblk_t logical_sb_block;
5019         unsigned long offset = 0;
5020         struct buffer_head *bh;
5021         int ret = -EINVAL;
5022         int blocksize;
5023
5024         blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
5025         if (!blocksize) {
5026                 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
5027                 return -EINVAL;
5028         }
5029
5030         /*
5031          * The ext4 superblock will not be buffer aligned for other than 1kB
5032          * block sizes.  We need to calculate the offset from buffer start.
5033          */
5034         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
5035                 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
5036                 offset = do_div(logical_sb_block, blocksize);
5037         } else {
5038                 logical_sb_block = sbi->s_sb_block;
5039         }
5040
5041         bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
5042         if (IS_ERR(bh)) {
5043                 ext4_msg(sb, KERN_ERR, "unable to read superblock");
5044                 return PTR_ERR(bh);
5045         }
5046         /*
5047          * Note: s_es must be initialized as soon as possible because
5048          *       some ext4 macro-instructions depend on its value
5049          */
5050         es = (struct ext4_super_block *) (bh->b_data + offset);
5051         sbi->s_es = es;
5052         sb->s_magic = le16_to_cpu(es->s_magic);
5053         if (sb->s_magic != EXT4_SUPER_MAGIC) {
5054                 if (!silent)
5055                         ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
5056                 goto out;
5057         }
5058
5059         if (le32_to_cpu(es->s_log_block_size) >
5060             (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
5061                 ext4_msg(sb, KERN_ERR,
5062                          "Invalid log block size: %u",
5063                          le32_to_cpu(es->s_log_block_size));
5064                 goto out;
5065         }
5066         if (le32_to_cpu(es->s_log_cluster_size) >
5067             (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
5068                 ext4_msg(sb, KERN_ERR,
5069                          "Invalid log cluster size: %u",
5070                          le32_to_cpu(es->s_log_cluster_size));
5071                 goto out;
5072         }
5073
5074         blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
5075
5076         /*
5077          * If the default block size is not the same as the real block size,
5078          * we need to reload it.
5079          */
5080         if (sb->s_blocksize == blocksize) {
5081                 *lsb = logical_sb_block;
5082                 sbi->s_sbh = bh;
5083                 return 0;
5084         }
5085
5086         /*
5087          * bh must be released before kill_bdev(), otherwise
5088          * it won't be freed and its page also. kill_bdev()
5089          * is called by sb_set_blocksize().
5090          */
5091         brelse(bh);
5092         /* Validate the filesystem blocksize */
5093         if (!sb_set_blocksize(sb, blocksize)) {
5094                 ext4_msg(sb, KERN_ERR, "bad block size %d",
5095                                 blocksize);
5096                 bh = NULL;
5097                 goto out;
5098         }
5099
5100         logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
5101         offset = do_div(logical_sb_block, blocksize);
5102         bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
5103         if (IS_ERR(bh)) {
5104                 ext4_msg(sb, KERN_ERR, "Can't read superblock on 2nd try");
5105                 ret = PTR_ERR(bh);
5106                 bh = NULL;
5107                 goto out;
5108         }
5109         es = (struct ext4_super_block *)(bh->b_data + offset);
5110         sbi->s_es = es;
5111         if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
5112                 ext4_msg(sb, KERN_ERR, "Magic mismatch, very weird!");
5113                 goto out;
5114         }
5115         *lsb = logical_sb_block;
5116         sbi->s_sbh = bh;
5117         return 0;
5118 out:
5119         brelse(bh);
5120         return ret;
5121 }
5122
5123 static void ext4_hash_info_init(struct super_block *sb)
5124 {
5125         struct ext4_sb_info *sbi = EXT4_SB(sb);
5126         struct ext4_super_block *es = sbi->s_es;
5127         unsigned int i;
5128
5129         for (i = 0; i < 4; i++)
5130                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
5131
5132         sbi->s_def_hash_version = es->s_def_hash_version;
5133         if (ext4_has_feature_dir_index(sb)) {
5134                 i = le32_to_cpu(es->s_flags);
5135                 if (i & EXT2_FLAGS_UNSIGNED_HASH)
5136                         sbi->s_hash_unsigned = 3;
5137                 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
5138 #ifdef __CHAR_UNSIGNED__
5139                         if (!sb_rdonly(sb))
5140                                 es->s_flags |=
5141                                         cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
5142                         sbi->s_hash_unsigned = 3;
5143 #else
5144                         if (!sb_rdonly(sb))
5145                                 es->s_flags |=
5146                                         cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
5147 #endif
5148                 }
5149         }
5150 }
5151
5152 static int ext4_block_group_meta_init(struct super_block *sb, int silent)
5153 {
5154         struct ext4_sb_info *sbi = EXT4_SB(sb);
5155         struct ext4_super_block *es = sbi->s_es;
5156         int has_huge_files;
5157
5158         has_huge_files = ext4_has_feature_huge_file(sb);
5159         sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
5160                                                       has_huge_files);
5161         sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
5162
5163         sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
5164         if (ext4_has_feature_64bit(sb)) {
5165                 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
5166                     sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
5167                     !is_power_of_2(sbi->s_desc_size)) {
5168                         ext4_msg(sb, KERN_ERR,
5169                                "unsupported descriptor size %lu",
5170                                sbi->s_desc_size);
5171                         return -EINVAL;
5172                 }
5173         } else
5174                 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
5175
5176         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
5177         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
5178
5179         sbi->s_inodes_per_block = sb->s_blocksize / EXT4_INODE_SIZE(sb);
5180         if (sbi->s_inodes_per_block == 0 || sbi->s_blocks_per_group == 0) {
5181                 if (!silent)
5182                         ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
5183                 return -EINVAL;
5184         }
5185         if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
5186             sbi->s_inodes_per_group > sb->s_blocksize * 8) {
5187                 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
5188                          sbi->s_inodes_per_group);
5189                 return -EINVAL;
5190         }
5191         sbi->s_itb_per_group = sbi->s_inodes_per_group /
5192                                         sbi->s_inodes_per_block;
5193         sbi->s_desc_per_block = sb->s_blocksize / EXT4_DESC_SIZE(sb);
5194         sbi->s_mount_state = le16_to_cpu(es->s_state) & ~EXT4_FC_REPLAY;
5195         sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
5196         sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
5197
5198         return 0;
5199 }
5200
5201 static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
5202 {
5203         struct ext4_super_block *es = NULL;
5204         struct ext4_sb_info *sbi = EXT4_SB(sb);
5205         ext4_fsblk_t logical_sb_block;
5206         struct inode *root;
5207         int needs_recovery;
5208         int err;
5209         ext4_group_t first_not_zeroed;
5210         struct ext4_fs_context *ctx = fc->fs_private;
5211         int silent = fc->sb_flags & SB_SILENT;
5212
5213         /* Set defaults for the variables that will be set during parsing */
5214         if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO))
5215                 ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5216
5217         sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
5218         sbi->s_sectors_written_start =
5219                 part_stat_read(sb->s_bdev, sectors[STAT_WRITE]);
5220
5221         err = ext4_load_super(sb, &logical_sb_block, silent);
5222         if (err)
5223                 goto out_fail;
5224
5225         es = sbi->s_es;
5226         sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
5227
5228         err = ext4_init_metadata_csum(sb, es);
5229         if (err)
5230                 goto failed_mount;
5231
5232         ext4_set_def_opts(sb, es);
5233
5234         sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
5235         sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
5236         sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
5237         sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
5238         sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
5239
5240         /*
5241          * set default s_li_wait_mult for lazyinit, for the case there is
5242          * no mount option specified.
5243          */
5244         sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
5245
5246         err = ext4_inode_info_init(sb, es);
5247         if (err)
5248                 goto failed_mount;
5249
5250         err = parse_apply_sb_mount_options(sb, ctx);
5251         if (err < 0)
5252                 goto failed_mount;
5253
5254         sbi->s_def_mount_opt = sbi->s_mount_opt;
5255         sbi->s_def_mount_opt2 = sbi->s_mount_opt2;
5256
5257         err = ext4_check_opt_consistency(fc, sb);
5258         if (err < 0)
5259                 goto failed_mount;
5260
5261         ext4_apply_options(fc, sb);
5262
5263         err = ext4_encoding_init(sb, es);
5264         if (err)
5265                 goto failed_mount;
5266
5267         err = ext4_check_journal_data_mode(sb);
5268         if (err)
5269                 goto failed_mount;
5270
5271         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5272                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5273
5274         /* i_version is always enabled now */
5275         sb->s_flags |= SB_I_VERSION;
5276
5277         err = ext4_check_feature_compatibility(sb, es, silent);
5278         if (err)
5279                 goto failed_mount;
5280
5281         err = ext4_block_group_meta_init(sb, silent);
5282         if (err)
5283                 goto failed_mount;
5284
5285         ext4_hash_info_init(sb);
5286
5287         err = ext4_handle_clustersize(sb);
5288         if (err)
5289                 goto failed_mount;
5290
5291         err = ext4_check_geometry(sb, es);
5292         if (err)
5293                 goto failed_mount;
5294
5295         timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
5296         spin_lock_init(&sbi->s_error_lock);
5297         INIT_WORK(&sbi->s_error_work, flush_stashed_error_work);
5298
5299         err = ext4_group_desc_init(sb, es, logical_sb_block, &first_not_zeroed);
5300         if (err)
5301                 goto failed_mount3;
5302
5303         err = ext4_es_register_shrinker(sbi);
5304         if (err)
5305                 goto failed_mount3;
5306
5307         sbi->s_stripe = ext4_get_stripe_size(sbi);
5308         /*
5309          * It's hard to get stripe aligned blocks if stripe is not aligned with
5310          * cluster, just disable stripe and alert user to simpfy code and avoid
5311          * stripe aligned allocation which will rarely successes.
5312          */
5313         if (sbi->s_stripe > 0 && sbi->s_cluster_ratio > 1 &&
5314             sbi->s_stripe % sbi->s_cluster_ratio != 0) {
5315                 ext4_msg(sb, KERN_WARNING,
5316                          "stripe (%lu) is not aligned with cluster size (%u), "
5317                          "stripe is disabled",
5318                          sbi->s_stripe, sbi->s_cluster_ratio);
5319                 sbi->s_stripe = 0;
5320         }
5321         sbi->s_extent_max_zeroout_kb = 32;
5322
5323         /*
5324          * set up enough so that it can read an inode
5325          */
5326         sb->s_op = &ext4_sops;
5327         sb->s_export_op = &ext4_export_ops;
5328         sb->s_xattr = ext4_xattr_handlers;
5329 #ifdef CONFIG_FS_ENCRYPTION
5330         sb->s_cop = &ext4_cryptops;
5331 #endif
5332 #ifdef CONFIG_FS_VERITY
5333         sb->s_vop = &ext4_verityops;
5334 #endif
5335 #ifdef CONFIG_QUOTA
5336         sb->dq_op = &ext4_quota_operations;
5337         if (ext4_has_feature_quota(sb))
5338                 sb->s_qcop = &dquot_quotactl_sysfile_ops;
5339         else
5340                 sb->s_qcop = &ext4_qctl_operations;
5341         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
5342 #endif
5343         memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
5344
5345         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
5346         mutex_init(&sbi->s_orphan_lock);
5347
5348         ext4_fast_commit_init(sb);
5349
5350         sb->s_root = NULL;
5351
5352         needs_recovery = (es->s_last_orphan != 0 ||
5353                           ext4_has_feature_orphan_present(sb) ||
5354                           ext4_has_feature_journal_needs_recovery(sb));
5355
5356         if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb)) {
5357                 err = ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block));
5358                 if (err)
5359                         goto failed_mount3a;
5360         }
5361
5362         err = -EINVAL;
5363         /*
5364          * The first inode we look at is the journal inode.  Don't try
5365          * root first: it may be modified in the journal!
5366          */
5367         if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
5368                 err = ext4_load_and_init_journal(sb, es, ctx);
5369                 if (err)
5370                         goto failed_mount3a;
5371         } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
5372                    ext4_has_feature_journal_needs_recovery(sb)) {
5373                 ext4_msg(sb, KERN_ERR, "required journal recovery "
5374                        "suppressed and not mounted read-only");
5375                 goto failed_mount3a;
5376         } else {
5377                 /* Nojournal mode, all journal mount options are illegal */
5378                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5379                         ext4_msg(sb, KERN_ERR, "can't mount with "
5380                                  "journal_async_commit, fs mounted w/o journal");
5381                         goto failed_mount3a;
5382                 }
5383
5384                 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
5385                         ext4_msg(sb, KERN_ERR, "can't mount with "
5386                                  "journal_checksum, fs mounted w/o journal");
5387                         goto failed_mount3a;
5388                 }
5389                 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
5390                         ext4_msg(sb, KERN_ERR, "can't mount with "
5391                                  "commit=%lu, fs mounted w/o journal",
5392                                  sbi->s_commit_interval / HZ);
5393                         goto failed_mount3a;
5394                 }
5395                 if (EXT4_MOUNT_DATA_FLAGS &
5396                     (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
5397                         ext4_msg(sb, KERN_ERR, "can't mount with "
5398                                  "data=, fs mounted w/o journal");
5399                         goto failed_mount3a;
5400                 }
5401                 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
5402                 clear_opt(sb, JOURNAL_CHECKSUM);
5403                 clear_opt(sb, DATA_FLAGS);
5404                 clear_opt2(sb, JOURNAL_FAST_COMMIT);
5405                 sbi->s_journal = NULL;
5406                 needs_recovery = 0;
5407         }
5408
5409         if (!test_opt(sb, NO_MBCACHE)) {
5410                 sbi->s_ea_block_cache = ext4_xattr_create_cache();
5411                 if (!sbi->s_ea_block_cache) {
5412                         ext4_msg(sb, KERN_ERR,
5413                                  "Failed to create ea_block_cache");
5414                         err = -EINVAL;
5415                         goto failed_mount_wq;
5416                 }
5417
5418                 if (ext4_has_feature_ea_inode(sb)) {
5419                         sbi->s_ea_inode_cache = ext4_xattr_create_cache();
5420                         if (!sbi->s_ea_inode_cache) {
5421                                 ext4_msg(sb, KERN_ERR,
5422                                          "Failed to create ea_inode_cache");
5423                                 err = -EINVAL;
5424                                 goto failed_mount_wq;
5425                         }
5426                 }
5427         }
5428
5429         /*
5430          * Get the # of file system overhead blocks from the
5431          * superblock if present.
5432          */
5433         sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
5434         /* ignore the precalculated value if it is ridiculous */
5435         if (sbi->s_overhead > ext4_blocks_count(es))
5436                 sbi->s_overhead = 0;
5437         /*
5438          * If the bigalloc feature is not enabled recalculating the
5439          * overhead doesn't take long, so we might as well just redo
5440          * it to make sure we are using the correct value.
5441          */
5442         if (!ext4_has_feature_bigalloc(sb))
5443                 sbi->s_overhead = 0;
5444         if (sbi->s_overhead == 0) {
5445                 err = ext4_calculate_overhead(sb);
5446                 if (err)
5447                         goto failed_mount_wq;
5448         }
5449
5450         /*
5451          * The maximum number of concurrent works can be high and
5452          * concurrency isn't really necessary.  Limit it to 1.
5453          */
5454         EXT4_SB(sb)->rsv_conversion_wq =
5455                 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
5456         if (!EXT4_SB(sb)->rsv_conversion_wq) {
5457                 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
5458                 err = -ENOMEM;
5459                 goto failed_mount4;
5460         }
5461
5462         /*
5463          * The jbd2_journal_load will have done any necessary log recovery,
5464          * so we can safely mount the rest of the filesystem now.
5465          */
5466
5467         root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
5468         if (IS_ERR(root)) {
5469                 ext4_msg(sb, KERN_ERR, "get root inode failed");
5470                 err = PTR_ERR(root);
5471                 root = NULL;
5472                 goto failed_mount4;
5473         }
5474         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
5475                 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
5476                 iput(root);
5477                 err = -EFSCORRUPTED;
5478                 goto failed_mount4;
5479         }
5480
5481         sb->s_root = d_make_root(root);
5482         if (!sb->s_root) {
5483                 ext4_msg(sb, KERN_ERR, "get root dentry failed");
5484                 err = -ENOMEM;
5485                 goto failed_mount4;
5486         }
5487
5488         err = ext4_setup_super(sb, es, sb_rdonly(sb));
5489         if (err == -EROFS) {
5490                 sb->s_flags |= SB_RDONLY;
5491         } else if (err)
5492                 goto failed_mount4a;
5493
5494         ext4_set_resv_clusters(sb);
5495
5496         if (test_opt(sb, BLOCK_VALIDITY)) {
5497                 err = ext4_setup_system_zone(sb);
5498                 if (err) {
5499                         ext4_msg(sb, KERN_ERR, "failed to initialize system "
5500                                  "zone (%d)", err);
5501                         goto failed_mount4a;
5502                 }
5503         }
5504         ext4_fc_replay_cleanup(sb);
5505
5506         ext4_ext_init(sb);
5507
5508         /*
5509          * Enable optimize_scan if number of groups is > threshold. This can be
5510          * turned off by passing "mb_optimize_scan=0". This can also be
5511          * turned on forcefully by passing "mb_optimize_scan=1".
5512          */
5513         if (!(ctx->spec & EXT4_SPEC_mb_optimize_scan)) {
5514                 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD)
5515                         set_opt2(sb, MB_OPTIMIZE_SCAN);
5516                 else
5517                         clear_opt2(sb, MB_OPTIMIZE_SCAN);
5518         }
5519
5520         err = ext4_mb_init(sb);
5521         if (err) {
5522                 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
5523                          err);
5524                 goto failed_mount5;
5525         }
5526
5527         /*
5528          * We can only set up the journal commit callback once
5529          * mballoc is initialized
5530          */
5531         if (sbi->s_journal)
5532                 sbi->s_journal->j_commit_callback =
5533                         ext4_journal_commit_callback;
5534
5535         err = ext4_percpu_param_init(sbi);
5536         if (err)
5537                 goto failed_mount6;
5538
5539         if (ext4_has_feature_flex_bg(sb))
5540                 if (!ext4_fill_flex_info(sb)) {
5541                         ext4_msg(sb, KERN_ERR,
5542                                "unable to initialize "
5543                                "flex_bg meta info!");
5544                         err = -ENOMEM;
5545                         goto failed_mount6;
5546                 }
5547
5548         err = ext4_register_li_request(sb, first_not_zeroed);
5549         if (err)
5550                 goto failed_mount6;
5551
5552         err = ext4_register_sysfs(sb);
5553         if (err)
5554                 goto failed_mount7;
5555
5556         err = ext4_init_orphan_info(sb);
5557         if (err)
5558                 goto failed_mount8;
5559 #ifdef CONFIG_QUOTA
5560         /* Enable quota usage during mount. */
5561         if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
5562                 err = ext4_enable_quotas(sb);
5563                 if (err)
5564                         goto failed_mount9;
5565         }
5566 #endif  /* CONFIG_QUOTA */
5567
5568         /*
5569          * Save the original bdev mapping's wb_err value which could be
5570          * used to detect the metadata async write error.
5571          */
5572         spin_lock_init(&sbi->s_bdev_wb_lock);
5573         errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
5574                                  &sbi->s_bdev_wb_err);
5575         sb->s_bdev->bd_super = sb;
5576         EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
5577         ext4_orphan_cleanup(sb, es);
5578         EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
5579         /*
5580          * Update the checksum after updating free space/inode counters and
5581          * ext4_orphan_cleanup. Otherwise the superblock can have an incorrect
5582          * checksum in the buffer cache until it is written out and
5583          * e2fsprogs programs trying to open a file system immediately
5584          * after it is mounted can fail.
5585          */
5586         ext4_superblock_csum_set(sb);
5587         if (needs_recovery) {
5588                 ext4_msg(sb, KERN_INFO, "recovery complete");
5589                 err = ext4_mark_recovery_complete(sb, es);
5590                 if (err)
5591                         goto failed_mount10;
5592         }
5593
5594         if (test_opt(sb, DISCARD) && !bdev_max_discard_sectors(sb->s_bdev))
5595                 ext4_msg(sb, KERN_WARNING,
5596                          "mounting with \"discard\" option, but the device does not support discard");
5597
5598         if (es->s_error_count)
5599                 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
5600
5601         /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
5602         ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
5603         ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
5604         ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
5605         atomic_set(&sbi->s_warning_count, 0);
5606         atomic_set(&sbi->s_msg_count, 0);
5607
5608         return 0;
5609
5610 failed_mount10:
5611         ext4_quotas_off(sb, EXT4_MAXQUOTAS);
5612 failed_mount9: __maybe_unused
5613         ext4_release_orphan_info(sb);
5614 failed_mount8:
5615         ext4_unregister_sysfs(sb);
5616         kobject_put(&sbi->s_kobj);
5617 failed_mount7:
5618         ext4_unregister_li_request(sb);
5619 failed_mount6:
5620         ext4_mb_release(sb);
5621         ext4_flex_groups_free(sbi);
5622         ext4_percpu_param_destroy(sbi);
5623 failed_mount5:
5624         ext4_ext_release(sb);
5625         ext4_release_system_zone(sb);
5626 failed_mount4a:
5627         dput(sb->s_root);
5628         sb->s_root = NULL;
5629 failed_mount4:
5630         ext4_msg(sb, KERN_ERR, "mount failed");
5631         if (EXT4_SB(sb)->rsv_conversion_wq)
5632                 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
5633 failed_mount_wq:
5634         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
5635         sbi->s_ea_inode_cache = NULL;
5636
5637         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
5638         sbi->s_ea_block_cache = NULL;
5639
5640         if (sbi->s_journal) {
5641                 /* flush s_error_work before journal destroy. */
5642                 flush_work(&sbi->s_error_work);
5643                 jbd2_journal_destroy(sbi->s_journal);
5644                 sbi->s_journal = NULL;
5645         }
5646 failed_mount3a:
5647         ext4_es_unregister_shrinker(sbi);
5648 failed_mount3:
5649         /* flush s_error_work before sbi destroy */
5650         flush_work(&sbi->s_error_work);
5651         del_timer_sync(&sbi->s_err_report);
5652         ext4_stop_mmpd(sbi);
5653         ext4_group_desc_free(sbi);
5654 failed_mount:
5655         if (sbi->s_chksum_driver)
5656                 crypto_free_shash(sbi->s_chksum_driver);
5657
5658 #if IS_ENABLED(CONFIG_UNICODE)
5659         utf8_unload(sb->s_encoding);
5660 #endif
5661
5662 #ifdef CONFIG_QUOTA
5663         for (unsigned int i = 0; i < EXT4_MAXQUOTAS; i++)
5664                 kfree(get_qf_name(sb, sbi, i));
5665 #endif
5666         fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
5667         /* ext4_blkdev_remove() calls kill_bdev(), release bh before it. */
5668         brelse(sbi->s_sbh);
5669         ext4_blkdev_remove(sbi);
5670 out_fail:
5671         invalidate_bdev(sb->s_bdev);
5672         sb->s_fs_info = NULL;
5673         return err;
5674 }
5675
5676 static int ext4_fill_super(struct super_block *sb, struct fs_context *fc)
5677 {
5678         struct ext4_fs_context *ctx = fc->fs_private;
5679         struct ext4_sb_info *sbi;
5680         const char *descr;
5681         int ret;
5682
5683         sbi = ext4_alloc_sbi(sb);
5684         if (!sbi)
5685                 return -ENOMEM;
5686
5687         fc->s_fs_info = sbi;
5688
5689         /* Cleanup superblock name */
5690         strreplace(sb->s_id, '/', '!');
5691
5692         sbi->s_sb_block = 1;    /* Default super block location */
5693         if (ctx->spec & EXT4_SPEC_s_sb_block)
5694                 sbi->s_sb_block = ctx->s_sb_block;
5695
5696         ret = __ext4_fill_super(fc, sb);
5697         if (ret < 0)
5698                 goto free_sbi;
5699
5700         if (sbi->s_journal) {
5701                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
5702                         descr = " journalled data mode";
5703                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
5704                         descr = " ordered data mode";
5705                 else
5706                         descr = " writeback data mode";
5707         } else
5708                 descr = "out journal";
5709
5710         if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
5711                 ext4_msg(sb, KERN_INFO, "mounted filesystem %pU %s with%s. "
5712                          "Quota mode: %s.", &sb->s_uuid,
5713                          sb_rdonly(sb) ? "ro" : "r/w", descr,
5714                          ext4_quota_mode(sb));
5715
5716         /* Update the s_overhead_clusters if necessary */
5717         ext4_update_overhead(sb, false);
5718         return 0;
5719
5720 free_sbi:
5721         ext4_free_sbi(sbi);
5722         fc->s_fs_info = NULL;
5723         return ret;
5724 }
5725
5726 static int ext4_get_tree(struct fs_context *fc)
5727 {
5728         return get_tree_bdev(fc, ext4_fill_super);
5729 }
5730
5731 /*
5732  * Setup any per-fs journal parameters now.  We'll do this both on
5733  * initial mount, once the journal has been initialised but before we've
5734  * done any recovery; and again on any subsequent remount.
5735  */
5736 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
5737 {
5738         struct ext4_sb_info *sbi = EXT4_SB(sb);
5739
5740         journal->j_commit_interval = sbi->s_commit_interval;
5741         journal->j_min_batch_time = sbi->s_min_batch_time;
5742         journal->j_max_batch_time = sbi->s_max_batch_time;
5743         ext4_fc_init(sb, journal);
5744
5745         write_lock(&journal->j_state_lock);
5746         if (test_opt(sb, BARRIER))
5747                 journal->j_flags |= JBD2_BARRIER;
5748         else
5749                 journal->j_flags &= ~JBD2_BARRIER;
5750         if (test_opt(sb, DATA_ERR_ABORT))
5751                 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
5752         else
5753                 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
5754         /*
5755          * Always enable journal cycle record option, letting the journal
5756          * records log transactions continuously between each mount.
5757          */
5758         journal->j_flags |= JBD2_CYCLE_RECORD;
5759         write_unlock(&journal->j_state_lock);
5760 }
5761
5762 static struct inode *ext4_get_journal_inode(struct super_block *sb,
5763                                              unsigned int journal_inum)
5764 {
5765         struct inode *journal_inode;
5766
5767         /*
5768          * Test for the existence of a valid inode on disk.  Bad things
5769          * happen if we iget() an unused inode, as the subsequent iput()
5770          * will try to delete it.
5771          */
5772         journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
5773         if (IS_ERR(journal_inode)) {
5774                 ext4_msg(sb, KERN_ERR, "no journal found");
5775                 return NULL;
5776         }
5777         if (!journal_inode->i_nlink) {
5778                 make_bad_inode(journal_inode);
5779                 iput(journal_inode);
5780                 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
5781                 return NULL;
5782         }
5783
5784         ext4_debug("Journal inode found at %p: %lld bytes\n",
5785                   journal_inode, journal_inode->i_size);
5786         if (!S_ISREG(journal_inode->i_mode) || IS_ENCRYPTED(journal_inode)) {
5787                 ext4_msg(sb, KERN_ERR, "invalid journal inode");
5788                 iput(journal_inode);
5789                 return NULL;
5790         }
5791         return journal_inode;
5792 }
5793
5794 static int ext4_journal_bmap(journal_t *journal, sector_t *block)
5795 {
5796         struct ext4_map_blocks map;
5797         int ret;
5798
5799         if (journal->j_inode == NULL)
5800                 return 0;
5801
5802         map.m_lblk = *block;
5803         map.m_len = 1;
5804         ret = ext4_map_blocks(NULL, journal->j_inode, &map, 0);
5805         if (ret <= 0) {
5806                 ext4_msg(journal->j_inode->i_sb, KERN_CRIT,
5807                          "journal bmap failed: block %llu ret %d\n",
5808                          *block, ret);
5809                 jbd2_journal_abort(journal, ret ? ret : -EIO);
5810                 return ret;
5811         }
5812         *block = map.m_pblk;
5813         return 0;
5814 }
5815
5816 static journal_t *ext4_get_journal(struct super_block *sb,
5817                                    unsigned int journal_inum)
5818 {
5819         struct inode *journal_inode;
5820         journal_t *journal;
5821
5822         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5823                 return NULL;
5824
5825         journal_inode = ext4_get_journal_inode(sb, journal_inum);
5826         if (!journal_inode)
5827                 return NULL;
5828
5829         journal = jbd2_journal_init_inode(journal_inode);
5830         if (!journal) {
5831                 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
5832                 iput(journal_inode);
5833                 return NULL;
5834         }
5835         journal->j_private = sb;
5836         journal->j_bmap = ext4_journal_bmap;
5837         ext4_init_journal_params(sb, journal);
5838         return journal;
5839 }
5840
5841 static journal_t *ext4_get_dev_journal(struct super_block *sb,
5842                                        dev_t j_dev)
5843 {
5844         struct buffer_head *bh;
5845         journal_t *journal;
5846         ext4_fsblk_t start;
5847         ext4_fsblk_t len;
5848         int hblock, blocksize;
5849         ext4_fsblk_t sb_block;
5850         unsigned long offset;
5851         struct ext4_super_block *es;
5852         struct block_device *bdev;
5853
5854         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5855                 return NULL;
5856
5857         bdev = ext4_blkdev_get(j_dev, sb);
5858         if (bdev == NULL)
5859                 return NULL;
5860
5861         blocksize = sb->s_blocksize;
5862         hblock = bdev_logical_block_size(bdev);
5863         if (blocksize < hblock) {
5864                 ext4_msg(sb, KERN_ERR,
5865                         "blocksize too small for journal device");
5866                 goto out_bdev;
5867         }
5868
5869         sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
5870         offset = EXT4_MIN_BLOCK_SIZE % blocksize;
5871         set_blocksize(bdev, blocksize);
5872         if (!(bh = __bread(bdev, sb_block, blocksize))) {
5873                 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
5874                        "external journal");
5875                 goto out_bdev;
5876         }
5877
5878         es = (struct ext4_super_block *) (bh->b_data + offset);
5879         if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
5880             !(le32_to_cpu(es->s_feature_incompat) &
5881               EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
5882                 ext4_msg(sb, KERN_ERR, "external journal has "
5883                                         "bad superblock");
5884                 brelse(bh);
5885                 goto out_bdev;
5886         }
5887
5888         if ((le32_to_cpu(es->s_feature_ro_compat) &
5889              EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
5890             es->s_checksum != ext4_superblock_csum(sb, es)) {
5891                 ext4_msg(sb, KERN_ERR, "external journal has "
5892                                        "corrupt superblock");
5893                 brelse(bh);
5894                 goto out_bdev;
5895         }
5896
5897         if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
5898                 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
5899                 brelse(bh);
5900                 goto out_bdev;
5901         }
5902
5903         len = ext4_blocks_count(es);
5904         start = sb_block + 1;
5905         brelse(bh);     /* we're done with the superblock */
5906
5907         journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
5908                                         start, len, blocksize);
5909         if (!journal) {
5910                 ext4_msg(sb, KERN_ERR, "failed to create device journal");
5911                 goto out_bdev;
5912         }
5913         journal->j_private = sb;
5914         if (ext4_read_bh_lock(journal->j_sb_buffer, REQ_META | REQ_PRIO, true)) {
5915                 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
5916                 goto out_journal;
5917         }
5918         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
5919                 ext4_msg(sb, KERN_ERR, "External journal has more than one "
5920                                         "user (unsupported) - %d",
5921                         be32_to_cpu(journal->j_superblock->s_nr_users));
5922                 goto out_journal;
5923         }
5924         EXT4_SB(sb)->s_journal_bdev = bdev;
5925         ext4_init_journal_params(sb, journal);
5926         return journal;
5927
5928 out_journal:
5929         jbd2_journal_destroy(journal);
5930 out_bdev:
5931         blkdev_put(bdev, sb);
5932         return NULL;
5933 }
5934
5935 static int ext4_load_journal(struct super_block *sb,
5936                              struct ext4_super_block *es,
5937                              unsigned long journal_devnum)
5938 {
5939         journal_t *journal;
5940         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
5941         dev_t journal_dev;
5942         int err = 0;
5943         int really_read_only;
5944         int journal_dev_ro;
5945
5946         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5947                 return -EFSCORRUPTED;
5948
5949         if (journal_devnum &&
5950             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5951                 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
5952                         "numbers have changed");
5953                 journal_dev = new_decode_dev(journal_devnum);
5954         } else
5955                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
5956
5957         if (journal_inum && journal_dev) {
5958                 ext4_msg(sb, KERN_ERR,
5959                          "filesystem has both journal inode and journal device!");
5960                 return -EINVAL;
5961         }
5962
5963         if (journal_inum) {
5964                 journal = ext4_get_journal(sb, journal_inum);
5965                 if (!journal)
5966                         return -EINVAL;
5967         } else {
5968                 journal = ext4_get_dev_journal(sb, journal_dev);
5969                 if (!journal)
5970                         return -EINVAL;
5971         }
5972
5973         journal_dev_ro = bdev_read_only(journal->j_dev);
5974         really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro;
5975
5976         if (journal_dev_ro && !sb_rdonly(sb)) {
5977                 ext4_msg(sb, KERN_ERR,
5978                          "journal device read-only, try mounting with '-o ro'");
5979                 err = -EROFS;
5980                 goto err_out;
5981         }
5982
5983         /*
5984          * Are we loading a blank journal or performing recovery after a
5985          * crash?  For recovery, we need to check in advance whether we
5986          * can get read-write access to the device.
5987          */
5988         if (ext4_has_feature_journal_needs_recovery(sb)) {
5989                 if (sb_rdonly(sb)) {
5990                         ext4_msg(sb, KERN_INFO, "INFO: recovery "
5991                                         "required on readonly filesystem");
5992                         if (really_read_only) {
5993                                 ext4_msg(sb, KERN_ERR, "write access "
5994                                         "unavailable, cannot proceed "
5995                                         "(try mounting with noload)");
5996                                 err = -EROFS;
5997                                 goto err_out;
5998                         }
5999                         ext4_msg(sb, KERN_INFO, "write access will "
6000                                "be enabled during recovery");
6001                 }
6002         }
6003
6004         if (!(journal->j_flags & JBD2_BARRIER))
6005                 ext4_msg(sb, KERN_INFO, "barriers disabled");
6006
6007         if (!ext4_has_feature_journal_needs_recovery(sb))
6008                 err = jbd2_journal_wipe(journal, !really_read_only);
6009         if (!err) {
6010                 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
6011                 __le16 orig_state;
6012                 bool changed = false;
6013
6014                 if (save)
6015                         memcpy(save, ((char *) es) +
6016                                EXT4_S_ERR_START, EXT4_S_ERR_LEN);
6017                 err = jbd2_journal_load(journal);
6018                 if (save && memcmp(((char *) es) + EXT4_S_ERR_START,
6019                                    save, EXT4_S_ERR_LEN)) {
6020                         memcpy(((char *) es) + EXT4_S_ERR_START,
6021                                save, EXT4_S_ERR_LEN);
6022                         changed = true;
6023                 }
6024                 kfree(save);
6025                 orig_state = es->s_state;
6026                 es->s_state |= cpu_to_le16(EXT4_SB(sb)->s_mount_state &
6027                                            EXT4_ERROR_FS);
6028                 if (orig_state != es->s_state)
6029                         changed = true;
6030                 /* Write out restored error information to the superblock */
6031                 if (changed && !really_read_only) {
6032                         int err2;
6033                         err2 = ext4_commit_super(sb);
6034                         err = err ? : err2;
6035                 }
6036         }
6037
6038         if (err) {
6039                 ext4_msg(sb, KERN_ERR, "error loading journal");
6040                 goto err_out;
6041         }
6042
6043         EXT4_SB(sb)->s_journal = journal;
6044         err = ext4_clear_journal_err(sb, es);
6045         if (err) {
6046                 EXT4_SB(sb)->s_journal = NULL;
6047                 jbd2_journal_destroy(journal);
6048                 return err;
6049         }
6050
6051         if (!really_read_only && journal_devnum &&
6052             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
6053                 es->s_journal_dev = cpu_to_le32(journal_devnum);
6054                 ext4_commit_super(sb);
6055         }
6056         if (!really_read_only && journal_inum &&
6057             journal_inum != le32_to_cpu(es->s_journal_inum)) {
6058                 es->s_journal_inum = cpu_to_le32(journal_inum);
6059                 ext4_commit_super(sb);
6060         }
6061
6062         return 0;
6063
6064 err_out:
6065         jbd2_journal_destroy(journal);
6066         return err;
6067 }
6068
6069 /* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */
6070 static void ext4_update_super(struct super_block *sb)
6071 {
6072         struct ext4_sb_info *sbi = EXT4_SB(sb);
6073         struct ext4_super_block *es = sbi->s_es;
6074         struct buffer_head *sbh = sbi->s_sbh;
6075
6076         lock_buffer(sbh);
6077         /*
6078          * If the file system is mounted read-only, don't update the
6079          * superblock write time.  This avoids updating the superblock
6080          * write time when we are mounting the root file system
6081          * read/only but we need to replay the journal; at that point,
6082          * for people who are east of GMT and who make their clock
6083          * tick in localtime for Windows bug-for-bug compatibility,
6084          * the clock is set in the future, and this will cause e2fsck
6085          * to complain and force a full file system check.
6086          */
6087         if (!(sb->s_flags & SB_RDONLY))
6088                 ext4_update_tstamp(es, s_wtime);
6089         es->s_kbytes_written =
6090                 cpu_to_le64(sbi->s_kbytes_written +
6091                     ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
6092                       sbi->s_sectors_written_start) >> 1));
6093         if (percpu_counter_initialized(&sbi->s_freeclusters_counter))
6094                 ext4_free_blocks_count_set(es,
6095                         EXT4_C2B(sbi, percpu_counter_sum_positive(
6096                                 &sbi->s_freeclusters_counter)));
6097         if (percpu_counter_initialized(&sbi->s_freeinodes_counter))
6098                 es->s_free_inodes_count =
6099                         cpu_to_le32(percpu_counter_sum_positive(
6100                                 &sbi->s_freeinodes_counter));
6101         /* Copy error information to the on-disk superblock */
6102         spin_lock(&sbi->s_error_lock);
6103         if (sbi->s_add_error_count > 0) {
6104                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6105                 if (!es->s_first_error_time && !es->s_first_error_time_hi) {
6106                         __ext4_update_tstamp(&es->s_first_error_time,
6107                                              &es->s_first_error_time_hi,
6108                                              sbi->s_first_error_time);
6109                         strncpy(es->s_first_error_func, sbi->s_first_error_func,
6110                                 sizeof(es->s_first_error_func));
6111                         es->s_first_error_line =
6112                                 cpu_to_le32(sbi->s_first_error_line);
6113                         es->s_first_error_ino =
6114                                 cpu_to_le32(sbi->s_first_error_ino);
6115                         es->s_first_error_block =
6116                                 cpu_to_le64(sbi->s_first_error_block);
6117                         es->s_first_error_errcode =
6118                                 ext4_errno_to_code(sbi->s_first_error_code);
6119                 }
6120                 __ext4_update_tstamp(&es->s_last_error_time,
6121                                      &es->s_last_error_time_hi,
6122                                      sbi->s_last_error_time);
6123                 strncpy(es->s_last_error_func, sbi->s_last_error_func,
6124                         sizeof(es->s_last_error_func));
6125                 es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line);
6126                 es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino);
6127                 es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block);
6128                 es->s_last_error_errcode =
6129                                 ext4_errno_to_code(sbi->s_last_error_code);
6130                 /*
6131                  * Start the daily error reporting function if it hasn't been
6132                  * started already
6133                  */
6134                 if (!es->s_error_count)
6135                         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);
6136                 le32_add_cpu(&es->s_error_count, sbi->s_add_error_count);
6137                 sbi->s_add_error_count = 0;
6138         }
6139         spin_unlock(&sbi->s_error_lock);
6140
6141         ext4_superblock_csum_set(sb);
6142         unlock_buffer(sbh);
6143 }
6144
6145 static int ext4_commit_super(struct super_block *sb)
6146 {
6147         struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
6148
6149         if (!sbh)
6150                 return -EINVAL;
6151         if (block_device_ejected(sb))
6152                 return -ENODEV;
6153
6154         ext4_update_super(sb);
6155
6156         lock_buffer(sbh);
6157         /* Buffer got discarded which means block device got invalidated */
6158         if (!buffer_mapped(sbh)) {
6159                 unlock_buffer(sbh);
6160                 return -EIO;
6161         }
6162
6163         if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
6164                 /*
6165                  * Oh, dear.  A previous attempt to write the
6166                  * superblock failed.  This could happen because the
6167                  * USB device was yanked out.  Or it could happen to
6168                  * be a transient write error and maybe the block will
6169                  * be remapped.  Nothing we can do but to retry the
6170                  * write and hope for the best.
6171                  */
6172                 ext4_msg(sb, KERN_ERR, "previous I/O error to "
6173                        "superblock detected");
6174                 clear_buffer_write_io_error(sbh);
6175                 set_buffer_uptodate(sbh);
6176         }
6177         get_bh(sbh);
6178         /* Clear potential dirty bit if it was journalled update */
6179         clear_buffer_dirty(sbh);
6180         sbh->b_end_io = end_buffer_write_sync;
6181         submit_bh(REQ_OP_WRITE | REQ_SYNC |
6182                   (test_opt(sb, BARRIER) ? REQ_FUA : 0), sbh);
6183         wait_on_buffer(sbh);
6184         if (buffer_write_io_error(sbh)) {
6185                 ext4_msg(sb, KERN_ERR, "I/O error while writing "
6186                        "superblock");
6187                 clear_buffer_write_io_error(sbh);
6188                 set_buffer_uptodate(sbh);
6189                 return -EIO;
6190         }
6191         return 0;
6192 }
6193
6194 /*
6195  * Have we just finished recovery?  If so, and if we are mounting (or
6196  * remounting) the filesystem readonly, then we will end up with a
6197  * consistent fs on disk.  Record that fact.
6198  */
6199 static int ext4_mark_recovery_complete(struct super_block *sb,
6200                                        struct ext4_super_block *es)
6201 {
6202         int err;
6203         journal_t *journal = EXT4_SB(sb)->s_journal;
6204
6205         if (!ext4_has_feature_journal(sb)) {
6206                 if (journal != NULL) {
6207                         ext4_error(sb, "Journal got removed while the fs was "
6208                                    "mounted!");
6209                         return -EFSCORRUPTED;
6210                 }
6211                 return 0;
6212         }
6213         jbd2_journal_lock_updates(journal);
6214         err = jbd2_journal_flush(journal, 0);
6215         if (err < 0)
6216                 goto out;
6217
6218         if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) ||
6219             ext4_has_feature_orphan_present(sb))) {
6220                 if (!ext4_orphan_file_empty(sb)) {
6221                         ext4_error(sb, "Orphan file not empty on read-only fs.");
6222                         err = -EFSCORRUPTED;
6223                         goto out;
6224                 }
6225                 ext4_clear_feature_journal_needs_recovery(sb);
6226                 ext4_clear_feature_orphan_present(sb);
6227                 ext4_commit_super(sb);
6228         }
6229 out:
6230         jbd2_journal_unlock_updates(journal);
6231         return err;
6232 }
6233
6234 /*
6235  * If we are mounting (or read-write remounting) a filesystem whose journal
6236  * has recorded an error from a previous lifetime, move that error to the
6237  * main filesystem now.
6238  */
6239 static int ext4_clear_journal_err(struct super_block *sb,
6240                                    struct ext4_super_block *es)
6241 {
6242         journal_t *journal;
6243         int j_errno;
6244         const char *errstr;
6245
6246         if (!ext4_has_feature_journal(sb)) {
6247                 ext4_error(sb, "Journal got removed while the fs was mounted!");
6248                 return -EFSCORRUPTED;
6249         }
6250
6251         journal = EXT4_SB(sb)->s_journal;
6252
6253         /*
6254          * Now check for any error status which may have been recorded in the
6255          * journal by a prior ext4_error() or ext4_abort()
6256          */
6257
6258         j_errno = jbd2_journal_errno(journal);
6259         if (j_errno) {
6260                 char nbuf[16];
6261
6262                 errstr = ext4_decode_error(sb, j_errno, nbuf);
6263                 ext4_warning(sb, "Filesystem error recorded "
6264                              "from previous mount: %s", errstr);
6265
6266                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
6267                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6268                 j_errno = ext4_commit_super(sb);
6269                 if (j_errno)
6270                         return j_errno;
6271                 ext4_warning(sb, "Marked fs in need of filesystem check.");
6272
6273                 jbd2_journal_clear_err(journal);
6274                 jbd2_journal_update_sb_errno(journal);
6275         }
6276         return 0;
6277 }
6278
6279 /*
6280  * Force the running and committing transactions to commit,
6281  * and wait on the commit.
6282  */
6283 int ext4_force_commit(struct super_block *sb)
6284 {
6285         journal_t *journal;
6286
6287         if (sb_rdonly(sb))
6288                 return 0;
6289
6290         journal = EXT4_SB(sb)->s_journal;
6291         return ext4_journal_force_commit(journal);
6292 }
6293
6294 static int ext4_sync_fs(struct super_block *sb, int wait)
6295 {
6296         int ret = 0;
6297         tid_t target;
6298         bool needs_barrier = false;
6299         struct ext4_sb_info *sbi = EXT4_SB(sb);
6300
6301         if (unlikely(ext4_forced_shutdown(sbi)))
6302                 return 0;
6303
6304         trace_ext4_sync_fs(sb, wait);
6305         flush_workqueue(sbi->rsv_conversion_wq);
6306         /*
6307          * Writeback quota in non-journalled quota case - journalled quota has
6308          * no dirty dquots
6309          */
6310         dquot_writeback_dquots(sb, -1);
6311         /*
6312          * Data writeback is possible w/o journal transaction, so barrier must
6313          * being sent at the end of the function. But we can skip it if
6314          * transaction_commit will do it for us.
6315          */
6316         if (sbi->s_journal) {
6317                 target = jbd2_get_latest_transaction(sbi->s_journal);
6318                 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
6319                     !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
6320                         needs_barrier = true;
6321
6322                 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
6323                         if (wait)
6324                                 ret = jbd2_log_wait_commit(sbi->s_journal,
6325                                                            target);
6326                 }
6327         } else if (wait && test_opt(sb, BARRIER))
6328                 needs_barrier = true;
6329         if (needs_barrier) {
6330                 int err;
6331                 err = blkdev_issue_flush(sb->s_bdev);
6332                 if (!ret)
6333                         ret = err;
6334         }
6335
6336         return ret;
6337 }
6338
6339 /*
6340  * LVM calls this function before a (read-only) snapshot is created.  This
6341  * gives us a chance to flush the journal completely and mark the fs clean.
6342  *
6343  * Note that only this function cannot bring a filesystem to be in a clean
6344  * state independently. It relies on upper layer to stop all data & metadata
6345  * modifications.
6346  */
6347 static int ext4_freeze(struct super_block *sb)
6348 {
6349         int error = 0;
6350         journal_t *journal;
6351
6352         if (sb_rdonly(sb))
6353                 return 0;
6354
6355         journal = EXT4_SB(sb)->s_journal;
6356
6357         if (journal) {
6358                 /* Now we set up the journal barrier. */
6359                 jbd2_journal_lock_updates(journal);
6360
6361                 /*
6362                  * Don't clear the needs_recovery flag if we failed to
6363                  * flush the journal.
6364                  */
6365                 error = jbd2_journal_flush(journal, 0);
6366                 if (error < 0)
6367                         goto out;
6368
6369                 /* Journal blocked and flushed, clear needs_recovery flag. */
6370                 ext4_clear_feature_journal_needs_recovery(sb);
6371                 if (ext4_orphan_file_empty(sb))
6372                         ext4_clear_feature_orphan_present(sb);
6373         }
6374
6375         error = ext4_commit_super(sb);
6376 out:
6377         if (journal)
6378                 /* we rely on upper layer to stop further updates */
6379                 jbd2_journal_unlock_updates(journal);
6380         return error;
6381 }
6382
6383 /*
6384  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
6385  * flag here, even though the filesystem is not technically dirty yet.
6386  */
6387 static int ext4_unfreeze(struct super_block *sb)
6388 {
6389         if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
6390                 return 0;
6391
6392         if (EXT4_SB(sb)->s_journal) {
6393                 /* Reset the needs_recovery flag before the fs is unlocked. */
6394                 ext4_set_feature_journal_needs_recovery(sb);
6395                 if (ext4_has_feature_orphan_file(sb))
6396                         ext4_set_feature_orphan_present(sb);
6397         }
6398
6399         ext4_commit_super(sb);
6400         return 0;
6401 }
6402
6403 /*
6404  * Structure to save mount options for ext4_remount's benefit
6405  */
6406 struct ext4_mount_options {
6407         unsigned long s_mount_opt;
6408         unsigned long s_mount_opt2;
6409         kuid_t s_resuid;
6410         kgid_t s_resgid;
6411         unsigned long s_commit_interval;
6412         u32 s_min_batch_time, s_max_batch_time;
6413 #ifdef CONFIG_QUOTA
6414         int s_jquota_fmt;
6415         char *s_qf_names[EXT4_MAXQUOTAS];
6416 #endif
6417 };
6418
6419 static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
6420 {
6421         struct ext4_fs_context *ctx = fc->fs_private;
6422         struct ext4_super_block *es;
6423         struct ext4_sb_info *sbi = EXT4_SB(sb);
6424         unsigned long old_sb_flags;
6425         struct ext4_mount_options old_opts;
6426         ext4_group_t g;
6427         int err = 0;
6428 #ifdef CONFIG_QUOTA
6429         int enable_quota = 0;
6430         int i, j;
6431         char *to_free[EXT4_MAXQUOTAS];
6432 #endif
6433
6434
6435         /* Store the original options */
6436         old_sb_flags = sb->s_flags;
6437         old_opts.s_mount_opt = sbi->s_mount_opt;
6438         old_opts.s_mount_opt2 = sbi->s_mount_opt2;
6439         old_opts.s_resuid = sbi->s_resuid;
6440         old_opts.s_resgid = sbi->s_resgid;
6441         old_opts.s_commit_interval = sbi->s_commit_interval;
6442         old_opts.s_min_batch_time = sbi->s_min_batch_time;
6443         old_opts.s_max_batch_time = sbi->s_max_batch_time;
6444 #ifdef CONFIG_QUOTA
6445         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
6446         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6447                 if (sbi->s_qf_names[i]) {
6448                         char *qf_name = get_qf_name(sb, sbi, i);
6449
6450                         old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
6451                         if (!old_opts.s_qf_names[i]) {
6452                                 for (j = 0; j < i; j++)
6453                                         kfree(old_opts.s_qf_names[j]);
6454                                 return -ENOMEM;
6455                         }
6456                 } else
6457                         old_opts.s_qf_names[i] = NULL;
6458 #endif
6459         if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) {
6460                 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
6461                         ctx->journal_ioprio =
6462                                 sbi->s_journal->j_task->io_context->ioprio;
6463                 else
6464                         ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
6465
6466         }
6467
6468         ext4_apply_options(fc, sb);
6469
6470         if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
6471             test_opt(sb, JOURNAL_CHECKSUM)) {
6472                 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
6473                          "during remount not supported; ignoring");
6474                 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6475         }
6476
6477         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
6478                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
6479                         ext4_msg(sb, KERN_ERR, "can't mount with "
6480                                  "both data=journal and delalloc");
6481                         err = -EINVAL;
6482                         goto restore_opts;
6483                 }
6484                 if (test_opt(sb, DIOREAD_NOLOCK)) {
6485                         ext4_msg(sb, KERN_ERR, "can't mount with "
6486                                  "both data=journal and dioread_nolock");
6487                         err = -EINVAL;
6488                         goto restore_opts;
6489                 }
6490         } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
6491                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
6492                         ext4_msg(sb, KERN_ERR, "can't mount with "
6493                                 "journal_async_commit in data=ordered mode");
6494                         err = -EINVAL;
6495                         goto restore_opts;
6496                 }
6497         }
6498
6499         if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
6500                 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
6501                 err = -EINVAL;
6502                 goto restore_opts;
6503         }
6504
6505         if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED))
6506                 ext4_abort(sb, ESHUTDOWN, "Abort forced by user");
6507
6508         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
6509                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
6510
6511         es = sbi->s_es;
6512
6513         if (sbi->s_journal) {
6514                 ext4_init_journal_params(sb, sbi->s_journal);
6515                 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
6516         }
6517
6518         /* Flush outstanding errors before changing fs state */
6519         flush_work(&sbi->s_error_work);
6520
6521         if ((bool)(fc->sb_flags & SB_RDONLY) != sb_rdonly(sb)) {
6522                 if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED)) {
6523                         err = -EROFS;
6524                         goto restore_opts;
6525                 }
6526
6527                 if (fc->sb_flags & SB_RDONLY) {
6528                         err = sync_filesystem(sb);
6529                         if (err < 0)
6530                                 goto restore_opts;
6531                         err = dquot_suspend(sb, -1);
6532                         if (err < 0)
6533                                 goto restore_opts;
6534
6535                         /*
6536                          * First of all, the unconditional stuff we have to do
6537                          * to disable replay of the journal when we next remount
6538                          */
6539                         sb->s_flags |= SB_RDONLY;
6540
6541                         /*
6542                          * OK, test if we are remounting a valid rw partition
6543                          * readonly, and if so set the rdonly flag and then
6544                          * mark the partition as valid again.
6545                          */
6546                         if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
6547                             (sbi->s_mount_state & EXT4_VALID_FS))
6548                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
6549
6550                         if (sbi->s_journal) {
6551                                 /*
6552                                  * We let remount-ro finish even if marking fs
6553                                  * as clean failed...
6554                                  */
6555                                 ext4_mark_recovery_complete(sb, es);
6556                         }
6557                 } else {
6558                         /* Make sure we can mount this feature set readwrite */
6559                         if (ext4_has_feature_readonly(sb) ||
6560                             !ext4_feature_set_ok(sb, 0)) {
6561                                 err = -EROFS;
6562                                 goto restore_opts;
6563                         }
6564                         /*
6565                          * Make sure the group descriptor checksums
6566                          * are sane.  If they aren't, refuse to remount r/w.
6567                          */
6568                         for (g = 0; g < sbi->s_groups_count; g++) {
6569                                 struct ext4_group_desc *gdp =
6570                                         ext4_get_group_desc(sb, g, NULL);
6571
6572                                 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
6573                                         ext4_msg(sb, KERN_ERR,
6574                "ext4_remount: Checksum for group %u failed (%u!=%u)",
6575                 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
6576                                                le16_to_cpu(gdp->bg_checksum));
6577                                         err = -EFSBADCRC;
6578                                         goto restore_opts;
6579                                 }
6580                         }
6581
6582                         /*
6583                          * If we have an unprocessed orphan list hanging
6584                          * around from a previously readonly bdev mount,
6585                          * require a full umount/remount for now.
6586                          */
6587                         if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) {
6588                                 ext4_msg(sb, KERN_WARNING, "Couldn't "
6589                                        "remount RDWR because of unprocessed "
6590                                        "orphan inode list.  Please "
6591                                        "umount/remount instead");
6592                                 err = -EINVAL;
6593                                 goto restore_opts;
6594                         }
6595
6596                         /*
6597                          * Mounting a RDONLY partition read-write, so reread
6598                          * and store the current valid flag.  (It may have
6599                          * been changed by e2fsck since we originally mounted
6600                          * the partition.)
6601                          */
6602                         if (sbi->s_journal) {
6603                                 err = ext4_clear_journal_err(sb, es);
6604                                 if (err)
6605                                         goto restore_opts;
6606                         }
6607                         sbi->s_mount_state = (le16_to_cpu(es->s_state) &
6608                                               ~EXT4_FC_REPLAY);
6609
6610                         err = ext4_setup_super(sb, es, 0);
6611                         if (err)
6612                                 goto restore_opts;
6613
6614                         sb->s_flags &= ~SB_RDONLY;
6615                         if (ext4_has_feature_mmp(sb)) {
6616                                 err = ext4_multi_mount_protect(sb,
6617                                                 le64_to_cpu(es->s_mmp_block));
6618                                 if (err)
6619                                         goto restore_opts;
6620                         }
6621 #ifdef CONFIG_QUOTA
6622                         enable_quota = 1;
6623 #endif
6624                 }
6625         }
6626
6627         /*
6628          * Handle creation of system zone data early because it can fail.
6629          * Releasing of existing data is done when we are sure remount will
6630          * succeed.
6631          */
6632         if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) {
6633                 err = ext4_setup_system_zone(sb);
6634                 if (err)
6635                         goto restore_opts;
6636         }
6637
6638         if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
6639                 err = ext4_commit_super(sb);
6640                 if (err)
6641                         goto restore_opts;
6642         }
6643
6644 #ifdef CONFIG_QUOTA
6645         if (enable_quota) {
6646                 if (sb_any_quota_suspended(sb))
6647                         dquot_resume(sb, -1);
6648                 else if (ext4_has_feature_quota(sb)) {
6649                         err = ext4_enable_quotas(sb);
6650                         if (err)
6651                                 goto restore_opts;
6652                 }
6653         }
6654         /* Release old quota file names */
6655         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6656                 kfree(old_opts.s_qf_names[i]);
6657 #endif
6658         if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
6659                 ext4_release_system_zone(sb);
6660
6661         /*
6662          * Reinitialize lazy itable initialization thread based on
6663          * current settings
6664          */
6665         if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
6666                 ext4_unregister_li_request(sb);
6667         else {
6668                 ext4_group_t first_not_zeroed;
6669                 first_not_zeroed = ext4_has_uninit_itable(sb);
6670                 ext4_register_li_request(sb, first_not_zeroed);
6671         }
6672
6673         if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6674                 ext4_stop_mmpd(sbi);
6675
6676         return 0;
6677
6678 restore_opts:
6679         /*
6680          * If there was a failing r/w to ro transition, we may need to
6681          * re-enable quota
6682          */
6683         if ((sb->s_flags & SB_RDONLY) && !(old_sb_flags & SB_RDONLY) &&
6684             sb_any_quota_suspended(sb))
6685                 dquot_resume(sb, -1);
6686         sb->s_flags = old_sb_flags;
6687         sbi->s_mount_opt = old_opts.s_mount_opt;
6688         sbi->s_mount_opt2 = old_opts.s_mount_opt2;
6689         sbi->s_resuid = old_opts.s_resuid;
6690         sbi->s_resgid = old_opts.s_resgid;
6691         sbi->s_commit_interval = old_opts.s_commit_interval;
6692         sbi->s_min_batch_time = old_opts.s_min_batch_time;
6693         sbi->s_max_batch_time = old_opts.s_max_batch_time;
6694         if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
6695                 ext4_release_system_zone(sb);
6696 #ifdef CONFIG_QUOTA
6697         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
6698         for (i = 0; i < EXT4_MAXQUOTAS; i++) {
6699                 to_free[i] = get_qf_name(sb, sbi, i);
6700                 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
6701         }
6702         synchronize_rcu();
6703         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6704                 kfree(to_free[i]);
6705 #endif
6706         if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6707                 ext4_stop_mmpd(sbi);
6708         return err;
6709 }
6710
6711 static int ext4_reconfigure(struct fs_context *fc)
6712 {
6713         struct super_block *sb = fc->root->d_sb;
6714         int ret;
6715
6716         fc->s_fs_info = EXT4_SB(sb);
6717
6718         ret = ext4_check_opt_consistency(fc, sb);
6719         if (ret < 0)
6720                 return ret;
6721
6722         ret = __ext4_remount(fc, sb);
6723         if (ret < 0)
6724                 return ret;
6725
6726         ext4_msg(sb, KERN_INFO, "re-mounted %pU %s. Quota mode: %s.",
6727                  &sb->s_uuid, sb_rdonly(sb) ? "ro" : "r/w",
6728                  ext4_quota_mode(sb));
6729
6730         return 0;
6731 }
6732
6733 #ifdef CONFIG_QUOTA
6734 static int ext4_statfs_project(struct super_block *sb,
6735                                kprojid_t projid, struct kstatfs *buf)
6736 {
6737         struct kqid qid;
6738         struct dquot *dquot;
6739         u64 limit;
6740         u64 curblock;
6741
6742         qid = make_kqid_projid(projid);
6743         dquot = dqget(sb, qid);
6744         if (IS_ERR(dquot))
6745                 return PTR_ERR(dquot);
6746         spin_lock(&dquot->dq_dqb_lock);
6747
6748         limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
6749                              dquot->dq_dqb.dqb_bhardlimit);
6750         limit >>= sb->s_blocksize_bits;
6751
6752         if (limit && buf->f_blocks > limit) {
6753                 curblock = (dquot->dq_dqb.dqb_curspace +
6754                             dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
6755                 buf->f_blocks = limit;
6756                 buf->f_bfree = buf->f_bavail =
6757                         (buf->f_blocks > curblock) ?
6758                          (buf->f_blocks - curblock) : 0;
6759         }
6760
6761         limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,
6762                              dquot->dq_dqb.dqb_ihardlimit);
6763         if (limit && buf->f_files > limit) {
6764                 buf->f_files = limit;
6765                 buf->f_ffree =
6766                         (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
6767                          (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
6768         }
6769
6770         spin_unlock(&dquot->dq_dqb_lock);
6771         dqput(dquot);
6772         return 0;
6773 }
6774 #endif
6775
6776 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
6777 {
6778         struct super_block *sb = dentry->d_sb;
6779         struct ext4_sb_info *sbi = EXT4_SB(sb);
6780         struct ext4_super_block *es = sbi->s_es;
6781         ext4_fsblk_t overhead = 0, resv_blocks;
6782         s64 bfree;
6783         resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
6784
6785         if (!test_opt(sb, MINIX_DF))
6786                 overhead = sbi->s_overhead;
6787
6788         buf->f_type = EXT4_SUPER_MAGIC;
6789         buf->f_bsize = sb->s_blocksize;
6790         buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
6791         bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
6792                 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
6793         /* prevent underflow in case that few free space is available */
6794         buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
6795         buf->f_bavail = buf->f_bfree -
6796                         (ext4_r_blocks_count(es) + resv_blocks);
6797         if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
6798                 buf->f_bavail = 0;
6799         buf->f_files = le32_to_cpu(es->s_inodes_count);
6800         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
6801         buf->f_namelen = EXT4_NAME_LEN;
6802         buf->f_fsid = uuid_to_fsid(es->s_uuid);
6803
6804 #ifdef CONFIG_QUOTA
6805         if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
6806             sb_has_quota_limits_enabled(sb, PRJQUOTA))
6807                 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
6808 #endif
6809         return 0;
6810 }
6811
6812
6813 #ifdef CONFIG_QUOTA
6814
6815 /*
6816  * Helper functions so that transaction is started before we acquire dqio_sem
6817  * to keep correct lock ordering of transaction > dqio_sem
6818  */
6819 static inline struct inode *dquot_to_inode(struct dquot *dquot)
6820 {
6821         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
6822 }
6823
6824 static int ext4_write_dquot(struct dquot *dquot)
6825 {
6826         int ret, err;
6827         handle_t *handle;
6828         struct inode *inode;
6829
6830         inode = dquot_to_inode(dquot);
6831         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
6832                                     EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
6833         if (IS_ERR(handle))
6834                 return PTR_ERR(handle);
6835         ret = dquot_commit(dquot);
6836         err = ext4_journal_stop(handle);
6837         if (!ret)
6838                 ret = err;
6839         return ret;
6840 }
6841
6842 static int ext4_acquire_dquot(struct dquot *dquot)
6843 {
6844         int ret, err;
6845         handle_t *handle;
6846
6847         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6848                                     EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
6849         if (IS_ERR(handle))
6850                 return PTR_ERR(handle);
6851         ret = dquot_acquire(dquot);
6852         err = ext4_journal_stop(handle);
6853         if (!ret)
6854                 ret = err;
6855         return ret;
6856 }
6857
6858 static int ext4_release_dquot(struct dquot *dquot)
6859 {
6860         int ret, err;
6861         handle_t *handle;
6862
6863         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6864                                     EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
6865         if (IS_ERR(handle)) {
6866                 /* Release dquot anyway to avoid endless cycle in dqput() */
6867                 dquot_release(dquot);
6868                 return PTR_ERR(handle);
6869         }
6870         ret = dquot_release(dquot);
6871         err = ext4_journal_stop(handle);
6872         if (!ret)
6873                 ret = err;
6874         return ret;
6875 }
6876
6877 static int ext4_mark_dquot_dirty(struct dquot *dquot)
6878 {
6879         struct super_block *sb = dquot->dq_sb;
6880
6881         if (ext4_is_quota_journalled(sb)) {
6882                 dquot_mark_dquot_dirty(dquot);
6883                 return ext4_write_dquot(dquot);
6884         } else {
6885                 return dquot_mark_dquot_dirty(dquot);
6886         }
6887 }
6888
6889 static int ext4_write_info(struct super_block *sb, int type)
6890 {
6891         int ret, err;
6892         handle_t *handle;
6893
6894         /* Data block + inode block */
6895         handle = ext4_journal_start_sb(sb, EXT4_HT_QUOTA, 2);
6896         if (IS_ERR(handle))
6897                 return PTR_ERR(handle);
6898         ret = dquot_commit_info(sb, type);
6899         err = ext4_journal_stop(handle);
6900         if (!ret)
6901                 ret = err;
6902         return ret;
6903 }
6904
6905 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
6906 {
6907         struct ext4_inode_info *ei = EXT4_I(inode);
6908
6909         /* The first argument of lockdep_set_subclass has to be
6910          * *exactly* the same as the argument to init_rwsem() --- in
6911          * this case, in init_once() --- or lockdep gets unhappy
6912          * because the name of the lock is set using the
6913          * stringification of the argument to init_rwsem().
6914          */
6915         (void) ei;      /* shut up clang warning if !CONFIG_LOCKDEP */
6916         lockdep_set_subclass(&ei->i_data_sem, subclass);
6917 }
6918
6919 /*
6920  * Standard function to be called on quota_on
6921  */
6922 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
6923                          const struct path *path)
6924 {
6925         int err;
6926
6927         if (!test_opt(sb, QUOTA))
6928                 return -EINVAL;
6929
6930         /* Quotafile not on the same filesystem? */
6931         if (path->dentry->d_sb != sb)
6932                 return -EXDEV;
6933
6934         /* Quota already enabled for this file? */
6935         if (IS_NOQUOTA(d_inode(path->dentry)))
6936                 return -EBUSY;
6937
6938         /* Journaling quota? */
6939         if (EXT4_SB(sb)->s_qf_names[type]) {
6940                 /* Quotafile not in fs root? */
6941                 if (path->dentry->d_parent != sb->s_root)
6942                         ext4_msg(sb, KERN_WARNING,
6943                                 "Quota file not on filesystem root. "
6944                                 "Journaled quota will not work");
6945                 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
6946         } else {
6947                 /*
6948                  * Clear the flag just in case mount options changed since
6949                  * last time.
6950                  */
6951                 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
6952         }
6953
6954         lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
6955         err = dquot_quota_on(sb, type, format_id, path);
6956         if (!err) {
6957                 struct inode *inode = d_inode(path->dentry);
6958                 handle_t *handle;
6959
6960                 /*
6961                  * Set inode flags to prevent userspace from messing with quota
6962                  * files. If this fails, we return success anyway since quotas
6963                  * are already enabled and this is not a hard failure.
6964                  */
6965                 inode_lock(inode);
6966                 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
6967                 if (IS_ERR(handle))
6968                         goto unlock_inode;
6969                 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
6970                 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
6971                                 S_NOATIME | S_IMMUTABLE);
6972                 err = ext4_mark_inode_dirty(handle, inode);
6973                 ext4_journal_stop(handle);
6974         unlock_inode:
6975                 inode_unlock(inode);
6976                 if (err)
6977                         dquot_quota_off(sb, type);
6978         }
6979         if (err)
6980                 lockdep_set_quota_inode(path->dentry->d_inode,
6981                                              I_DATA_SEM_NORMAL);
6982         return err;
6983 }
6984
6985 static inline bool ext4_check_quota_inum(int type, unsigned long qf_inum)
6986 {
6987         switch (type) {
6988         case USRQUOTA:
6989                 return qf_inum == EXT4_USR_QUOTA_INO;
6990         case GRPQUOTA:
6991                 return qf_inum == EXT4_GRP_QUOTA_INO;
6992         case PRJQUOTA:
6993                 return qf_inum >= EXT4_GOOD_OLD_FIRST_INO;
6994         default:
6995                 BUG();
6996         }
6997 }
6998
6999 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
7000                              unsigned int flags)
7001 {
7002         int err;
7003         struct inode *qf_inode;
7004         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7005                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
7006                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
7007                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7008         };
7009
7010         BUG_ON(!ext4_has_feature_quota(sb));
7011
7012         if (!qf_inums[type])
7013                 return -EPERM;
7014
7015         if (!ext4_check_quota_inum(type, qf_inums[type])) {
7016                 ext4_error(sb, "Bad quota inum: %lu, type: %d",
7017                                 qf_inums[type], type);
7018                 return -EUCLEAN;
7019         }
7020
7021         qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7022         if (IS_ERR(qf_inode)) {
7023                 ext4_error(sb, "Bad quota inode: %lu, type: %d",
7024                                 qf_inums[type], type);
7025                 return PTR_ERR(qf_inode);
7026         }
7027
7028         /* Don't account quota for quota files to avoid recursion */
7029         qf_inode->i_flags |= S_NOQUOTA;
7030         lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7031         err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
7032         if (err)
7033                 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7034         iput(qf_inode);
7035
7036         return err;
7037 }
7038
7039 /* Enable usage tracking for all quota types. */
7040 int ext4_enable_quotas(struct super_block *sb)
7041 {
7042         int type, err = 0;
7043         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7044                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
7045                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
7046                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7047         };
7048         bool quota_mopt[EXT4_MAXQUOTAS] = {
7049                 test_opt(sb, USRQUOTA),
7050                 test_opt(sb, GRPQUOTA),
7051                 test_opt(sb, PRJQUOTA),
7052         };
7053
7054         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
7055         for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7056                 if (qf_inums[type]) {
7057                         err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
7058                                 DQUOT_USAGE_ENABLED |
7059                                 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7060                         if (err) {
7061                                 ext4_warning(sb,
7062                                         "Failed to enable quota tracking "
7063                                         "(type=%d, err=%d, ino=%lu). "
7064                                         "Please run e2fsck to fix.", type,
7065                                         err, qf_inums[type]);
7066
7067                                 ext4_quotas_off(sb, type);
7068                                 return err;
7069                         }
7070                 }
7071         }
7072         return 0;
7073 }
7074
7075 static int ext4_quota_off(struct super_block *sb, int type)
7076 {
7077         struct inode *inode = sb_dqopt(sb)->files[type];
7078         handle_t *handle;
7079         int err;
7080
7081         /* Force all delayed allocation blocks to be allocated.
7082          * Caller already holds s_umount sem */
7083         if (test_opt(sb, DELALLOC))
7084                 sync_filesystem(sb);
7085
7086         if (!inode || !igrab(inode))
7087                 goto out;
7088
7089         err = dquot_quota_off(sb, type);
7090         if (err || ext4_has_feature_quota(sb))
7091                 goto out_put;
7092
7093         inode_lock(inode);
7094         /*
7095          * Update modification times of quota files when userspace can
7096          * start looking at them. If we fail, we return success anyway since
7097          * this is not a hard failure and quotas are already disabled.
7098          */
7099         handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
7100         if (IS_ERR(handle)) {
7101                 err = PTR_ERR(handle);
7102                 goto out_unlock;
7103         }
7104         EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
7105         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
7106         inode->i_mtime = inode_set_ctime_current(inode);
7107         err = ext4_mark_inode_dirty(handle, inode);
7108         ext4_journal_stop(handle);
7109 out_unlock:
7110         inode_unlock(inode);
7111 out_put:
7112         lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
7113         iput(inode);
7114         return err;
7115 out:
7116         return dquot_quota_off(sb, type);
7117 }
7118
7119 /* Read data from quotafile - avoid pagecache and such because we cannot afford
7120  * acquiring the locks... As quota files are never truncated and quota code
7121  * itself serializes the operations (and no one else should touch the files)
7122  * we don't have to be afraid of races */
7123 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
7124                                size_t len, loff_t off)
7125 {
7126         struct inode *inode = sb_dqopt(sb)->files[type];
7127         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
7128         int offset = off & (sb->s_blocksize - 1);
7129         int tocopy;
7130         size_t toread;
7131         struct buffer_head *bh;
7132         loff_t i_size = i_size_read(inode);
7133
7134         if (off > i_size)
7135                 return 0;
7136         if (off+len > i_size)
7137                 len = i_size-off;
7138         toread = len;
7139         while (toread > 0) {
7140                 tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
7141                 bh = ext4_bread(NULL, inode, blk, 0);
7142                 if (IS_ERR(bh))
7143                         return PTR_ERR(bh);
7144                 if (!bh)        /* A hole? */
7145                         memset(data, 0, tocopy);
7146                 else
7147                         memcpy(data, bh->b_data+offset, tocopy);
7148                 brelse(bh);
7149                 offset = 0;
7150                 toread -= tocopy;
7151                 data += tocopy;
7152                 blk++;
7153         }
7154         return len;
7155 }
7156
7157 /* Write to quotafile (we know the transaction is already started and has
7158  * enough credits) */
7159 static ssize_t ext4_quota_write(struct super_block *sb, int type,
7160                                 const char *data, size_t len, loff_t off)
7161 {
7162         struct inode *inode = sb_dqopt(sb)->files[type];
7163         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
7164         int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);
7165         int retries = 0;
7166         struct buffer_head *bh;
7167         handle_t *handle = journal_current_handle();
7168
7169         if (!handle) {
7170                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
7171                         " cancelled because transaction is not started",
7172                         (unsigned long long)off, (unsigned long long)len);
7173                 return -EIO;
7174         }
7175         /*
7176          * Since we account only one data block in transaction credits,
7177          * then it is impossible to cross a block boundary.
7178          */
7179         if (sb->s_blocksize - offset < len) {
7180                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
7181                         " cancelled because not block aligned",
7182                         (unsigned long long)off, (unsigned long long)len);
7183                 return -EIO;
7184         }
7185
7186         do {
7187                 bh = ext4_bread(handle, inode, blk,
7188                                 EXT4_GET_BLOCKS_CREATE |
7189                                 EXT4_GET_BLOCKS_METADATA_NOFAIL);
7190         } while (PTR_ERR(bh) == -ENOSPC &&
7191                  ext4_should_retry_alloc(inode->i_sb, &retries));
7192         if (IS_ERR(bh))
7193                 return PTR_ERR(bh);
7194         if (!bh)
7195                 goto out;
7196         BUFFER_TRACE(bh, "get write access");
7197         err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE);
7198         if (err) {
7199                 brelse(bh);
7200                 return err;
7201         }
7202         lock_buffer(bh);
7203         memcpy(bh->b_data+offset, data, len);
7204         flush_dcache_page(bh->b_page);
7205         unlock_buffer(bh);
7206         err = ext4_handle_dirty_metadata(handle, NULL, bh);
7207         brelse(bh);
7208 out:
7209         if (inode->i_size < off + len) {
7210                 i_size_write(inode, off + len);
7211                 EXT4_I(inode)->i_disksize = inode->i_size;
7212                 err2 = ext4_mark_inode_dirty(handle, inode);
7213                 if (unlikely(err2 && !err))
7214                         err = err2;
7215         }
7216         return err ? err : len;
7217 }
7218 #endif
7219
7220 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
7221 static inline void register_as_ext2(void)
7222 {
7223         int err = register_filesystem(&ext2_fs_type);
7224         if (err)
7225                 printk(KERN_WARNING
7226                        "EXT4-fs: Unable to register as ext2 (%d)\n", err);
7227 }
7228
7229 static inline void unregister_as_ext2(void)
7230 {
7231         unregister_filesystem(&ext2_fs_type);
7232 }
7233
7234 static inline int ext2_feature_set_ok(struct super_block *sb)
7235 {
7236         if (ext4_has_unknown_ext2_incompat_features(sb))
7237                 return 0;
7238         if (sb_rdonly(sb))
7239                 return 1;
7240         if (ext4_has_unknown_ext2_ro_compat_features(sb))
7241                 return 0;
7242         return 1;
7243 }
7244 #else
7245 static inline void register_as_ext2(void) { }
7246 static inline void unregister_as_ext2(void) { }
7247 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
7248 #endif
7249
7250 static inline void register_as_ext3(void)
7251 {
7252         int err = register_filesystem(&ext3_fs_type);
7253         if (err)
7254                 printk(KERN_WARNING
7255                        "EXT4-fs: Unable to register as ext3 (%d)\n", err);
7256 }
7257
7258 static inline void unregister_as_ext3(void)
7259 {
7260         unregister_filesystem(&ext3_fs_type);
7261 }
7262
7263 static inline int ext3_feature_set_ok(struct super_block *sb)
7264 {
7265         if (ext4_has_unknown_ext3_incompat_features(sb))
7266                 return 0;
7267         if (!ext4_has_feature_journal(sb))
7268                 return 0;
7269         if (sb_rdonly(sb))
7270                 return 1;
7271         if (ext4_has_unknown_ext3_ro_compat_features(sb))
7272                 return 0;
7273         return 1;
7274 }
7275
7276 static struct file_system_type ext4_fs_type = {
7277         .owner                  = THIS_MODULE,
7278         .name                   = "ext4",
7279         .init_fs_context        = ext4_init_fs_context,
7280         .parameters             = ext4_param_specs,
7281         .kill_sb                = kill_block_super,
7282         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
7283 };
7284 MODULE_ALIAS_FS("ext4");
7285
7286 /* Shared across all ext4 file systems */
7287 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
7288
7289 static int __init ext4_init_fs(void)
7290 {
7291         int i, err;
7292
7293         ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
7294         ext4_li_info = NULL;
7295
7296         /* Build-time check for flags consistency */
7297         ext4_check_flag_values();
7298
7299         for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
7300                 init_waitqueue_head(&ext4__ioend_wq[i]);
7301
7302         err = ext4_init_es();
7303         if (err)
7304                 return err;
7305
7306         err = ext4_init_pending();
7307         if (err)
7308                 goto out7;
7309
7310         err = ext4_init_post_read_processing();
7311         if (err)
7312                 goto out6;
7313
7314         err = ext4_init_pageio();
7315         if (err)
7316                 goto out5;
7317
7318         err = ext4_init_system_zone();
7319         if (err)
7320                 goto out4;
7321
7322         err = ext4_init_sysfs();
7323         if (err)
7324                 goto out3;
7325
7326         err = ext4_init_mballoc();
7327         if (err)
7328                 goto out2;
7329         err = init_inodecache();
7330         if (err)
7331                 goto out1;
7332
7333         err = ext4_fc_init_dentry_cache();
7334         if (err)
7335                 goto out05;
7336
7337         register_as_ext3();
7338         register_as_ext2();
7339         err = register_filesystem(&ext4_fs_type);
7340         if (err)
7341                 goto out;
7342
7343         return 0;
7344 out:
7345         unregister_as_ext2();
7346         unregister_as_ext3();
7347         ext4_fc_destroy_dentry_cache();
7348 out05:
7349         destroy_inodecache();
7350 out1:
7351         ext4_exit_mballoc();
7352 out2:
7353         ext4_exit_sysfs();
7354 out3:
7355         ext4_exit_system_zone();
7356 out4:
7357         ext4_exit_pageio();
7358 out5:
7359         ext4_exit_post_read_processing();
7360 out6:
7361         ext4_exit_pending();
7362 out7:
7363         ext4_exit_es();
7364
7365         return err;
7366 }
7367
7368 static void __exit ext4_exit_fs(void)
7369 {
7370         ext4_destroy_lazyinit_thread();
7371         unregister_as_ext2();
7372         unregister_as_ext3();
7373         unregister_filesystem(&ext4_fs_type);
7374         ext4_fc_destroy_dentry_cache();
7375         destroy_inodecache();
7376         ext4_exit_mballoc();
7377         ext4_exit_sysfs();
7378         ext4_exit_system_zone();
7379         ext4_exit_pageio();
7380         ext4_exit_post_read_processing();
7381         ext4_exit_es();
7382         ext4_exit_pending();
7383 }
7384
7385 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
7386 MODULE_DESCRIPTION("Fourth Extended Filesystem");
7387 MODULE_LICENSE("GPL");
7388 MODULE_SOFTDEP("pre: crc32c");
7389 module_init(ext4_init_fs)
7390 module_exit(ext4_exit_fs)