fs/f2fs/namei.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/namei.c
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  */
   8 #include <linux/fs.h>
   9 #include <linux/f2fs_fs.h>
  10 #include <linux/pagemap.h>
  11 #include <linux/sched.h>
  12 #include <linux/ctype.h>
  13 #include <linux/random.h>
  14 #include <linux/dcache.h>
  15 #include <linux/namei.h>
  16 #include <linux/quotaops.h>
  17
  18 #include "f2fs.h"
  19 #include "node.h"
  20 #include "segment.h"
  21 #include "xattr.h"
  22 #include "acl.h"
  23 #include <trace/events/f2fs.h>
  24
  25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  26 {
  27         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  28         nid_t ino;
  29         struct inode *inode;
  30         bool nid_free = false;
  31         int xattr_size = 0;
  32         int err;
  33
  34         inode = new_inode(dir->i_sb);
  35         if (!inode)
  36                 return ERR_PTR(-ENOMEM);
  37
  38         f2fs_lock_op(sbi);
  39         if (!f2fs_alloc_nid(sbi, &ino)) {
  40                 f2fs_unlock_op(sbi);
  41                 err = -ENOSPC;
  42                 goto fail;
  43         }
  44         f2fs_unlock_op(sbi);
  45
  46         nid_free = true;
  47
  48         inode_init_owner(inode, dir, mode);
  49
  50         inode->i_ino = ino;
  51         inode->i_blocks = 0;
  52         inode->i_mtime = inode->i_atime = inode->i_ctime =
  53                         F2FS_I(inode)->i_crtime = current_time(inode);
  54         inode->i_generation = prandom_u32();
  55
  56         if (S_ISDIR(inode->i_mode))
  57                 F2FS_I(inode)->i_current_depth = 1;
  58
  59         err = insert_inode_locked(inode);
  60         if (err) {
  61                 err = -EINVAL;
  62                 goto fail;
  63         }
  64
  65         if (f2fs_sb_has_project_quota(sbi) &&
  66                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
  67                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  68         else
  69                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  70                                                         F2FS_DEF_PROJID);
  71
  72         err = dquot_initialize(inode);
  73         if (err)
  74                 goto fail_drop;
  75
  76         set_inode_flag(inode, FI_NEW_INODE);
  77
  78         /* If the directory encrypted, then we should encrypt the inode. */
  79         if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
  80                                 f2fs_may_encrypt(inode))
  81                 f2fs_set_encrypted_inode(inode);
  82
  83         if (f2fs_sb_has_extra_attr(sbi)) {
  84                 set_inode_flag(inode, FI_EXTRA_ATTR);
  85                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  86         }
  87
  88         if (test_opt(sbi, INLINE_XATTR))
  89                 set_inode_flag(inode, FI_INLINE_XATTR);
  90
  91         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  92                 set_inode_flag(inode, FI_INLINE_DATA);
  93         if (f2fs_may_inline_dentry(inode))
  94                 set_inode_flag(inode, FI_INLINE_DENTRY);
  95
  96         if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
  97                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
  98                 if (f2fs_has_inline_xattr(inode))
  99                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
 100                 /* Otherwise, will be 0 */
 101         } else if (f2fs_has_inline_xattr(inode) ||
 102                                 f2fs_has_inline_dentry(inode)) {
 103                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 104         }
 105         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 106
 107         f2fs_init_extent_tree(inode, NULL);
 108
 109         stat_inc_inline_xattr(inode);
 110         stat_inc_inline_inode(inode);
 111         stat_inc_inline_dir(inode);
 112
 113         F2FS_I(inode)->i_flags =
 114                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 115
 116         if (S_ISDIR(inode->i_mode))
 117                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
 118
 119         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
 120                 set_inode_flag(inode, FI_PROJ_INHERIT);
 121
 122         f2fs_set_inode_flags(inode);
 123
 124         trace_f2fs_new_inode(inode, 0);
 125         return inode;
 126
 127 fail:
 128         trace_f2fs_new_inode(inode, err);
 129         make_bad_inode(inode);
 130         if (nid_free)
 131                 set_inode_flag(inode, FI_FREE_NID);
 132         iput(inode);
 133         return ERR_PTR(err);
 134 fail_drop:
 135         trace_f2fs_new_inode(inode, err);
 136         dquot_drop(inode);
 137         inode->i_flags |= S_NOQUOTA;
 138         if (nid_free)
 139                 set_inode_flag(inode, FI_FREE_NID);
 140         clear_nlink(inode);
 141         unlock_new_inode(inode);
 142         iput(inode);
 143         return ERR_PTR(err);
 144 }
 145
 146 static inline int is_extension_exist(const unsigned char *s, const char *sub)
 147 {
 148         size_t slen = strlen(s);
 149         size_t sublen = strlen(sub);
 150         int i;
 151
 152         /*
 153          * filename format of multimedia file should be defined as:
 154          * "filename + '.' + extension + (optional: '.' + temp extension)".
 155          */
 156         if (slen < sublen + 2)
 157                 return 0;
 158
 159         for (i = 1; i < slen - sublen; i++) {
 160                 if (s[i] != '.')
 161                         continue;
 162                 if (!strncasecmp(s + i + 1, sub, sublen))
 163                         return 1;
 164         }
 165
 166         return 0;
 167 }
 168
 169 /*
 170  * Set multimedia files as cold files for hot/cold data separation
 171  */
 172 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 173                 const unsigned char *name)
 174 {
 175         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 176         int i, cold_count, hot_count;
 177
 178         down_read(&sbi->sb_lock);
 179
 180         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 181         hot_count = sbi->raw_super->hot_ext_count;
 182
 183         for (i = 0; i < cold_count + hot_count; i++) {
 184                 if (is_extension_exist(name, extlist[i]))
 185                         break;
 186         }
 187
 188         up_read(&sbi->sb_lock);
 189
 190         if (i == cold_count + hot_count)
 191                 return;
 192
 193         if (i < cold_count)
 194                 file_set_cold(inode);
 195         else
 196                 file_set_hot(inode);
 197 }
 198
 199 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 200                                                         bool hot, bool set)
 201 {
 202         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 203         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 204         int hot_count = sbi->raw_super->hot_ext_count;
 205         int total_count = cold_count + hot_count;
 206         int start, count;
 207         int i;
 208
 209         if (set) {
 210                 if (total_count == F2FS_MAX_EXTENSION)
 211                         return -EINVAL;
 212         } else {
 213                 if (!hot && !cold_count)
 214                         return -EINVAL;
 215                 if (hot && !hot_count)
 216                         return -EINVAL;
 217         }
 218
 219         if (hot) {
 220                 start = cold_count;
 221                 count = total_count;
 222         } else {
 223                 start = 0;
 224                 count = cold_count;
 225         }
 226
 227         for (i = start; i < count; i++) {
 228                 if (strcmp(name, extlist[i]))
 229                         continue;
 230
 231                 if (set)
 232                         return -EINVAL;
 233
 234                 memcpy(extlist[i], extlist[i + 1],
 235                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 236                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 237                 if (hot)
 238                         sbi->raw_super->hot_ext_count = hot_count - 1;
 239                 else
 240                         sbi->raw_super->extension_count =
 241                                                 cpu_to_le32(cold_count - 1);
 242                 return 0;
 243         }
 244
 245         if (!set)
 246                 return -EINVAL;
 247
 248         if (hot) {
 249                 memcpy(extlist[count], name, strlen(name));
 250                 sbi->raw_super->hot_ext_count = hot_count + 1;
 251         } else {
 252                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 253
 254                 memcpy(buf, &extlist[cold_count],
 255                                 F2FS_EXTENSION_LEN * hot_count);
 256                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 257                 memcpy(extlist[cold_count], name, strlen(name));
 258                 memcpy(&extlist[cold_count + 1], buf,
 259                                 F2FS_EXTENSION_LEN * hot_count);
 260                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 261         }
 262         return 0;
 263 }
 264
 265 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 266                                                 bool excl)
 267 {
 268         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 269         struct inode *inode;
 270         nid_t ino = 0;
 271         int err;
 272
 273         if (unlikely(f2fs_cp_error(sbi)))
 274                 return -EIO;
 275         err = f2fs_is_checkpoint_ready(sbi);
 276         if (err)
 277                 return err;
 278
 279         err = dquot_initialize(dir);
 280         if (err)
 281                 return err;
 282
 283         inode = f2fs_new_inode(dir, mode);
 284         if (IS_ERR(inode))
 285                 return PTR_ERR(inode);
 286
 287         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 288                 set_file_temperature(sbi, inode, dentry->d_name.name);
 289
 290         inode->i_op = &f2fs_file_inode_operations;
 291         inode->i_fop = &f2fs_file_operations;
 292         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 293         ino = inode->i_ino;
 294
 295         f2fs_lock_op(sbi);
 296         err = f2fs_add_link(dentry, inode);
 297         if (err)
 298                 goto out;
 299         f2fs_unlock_op(sbi);
 300
 301         f2fs_alloc_nid_done(sbi, ino);
 302
 303         d_instantiate_new(dentry, inode);
 304
 305         if (IS_DIRSYNC(dir))
 306                 f2fs_sync_fs(sbi->sb, 1);
 307
 308         f2fs_balance_fs(sbi, true);
 309         return 0;
 310 out:
 311         f2fs_handle_failed_inode(inode);
 312         return err;
 313 }
 314
 315 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 316                 struct dentry *dentry)
 317 {
 318         struct inode *inode = d_inode(old_dentry);
 319         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 320         int err;
 321
 322         if (unlikely(f2fs_cp_error(sbi)))
 323                 return -EIO;
 324         err = f2fs_is_checkpoint_ready(sbi);
 325         if (err)
 326                 return err;
 327
 328         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 329         if (err)
 330                 return err;
 331
 332         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 333                         (!projid_eq(F2FS_I(dir)->i_projid,
 334                         F2FS_I(old_dentry->d_inode)->i_projid)))
 335                 return -EXDEV;
 336
 337         err = dquot_initialize(dir);
 338         if (err)
 339                 return err;
 340
 341         f2fs_balance_fs(sbi, true);
 342
 343         inode->i_ctime = current_time(inode);
 344         ihold(inode);
 345
 346         set_inode_flag(inode, FI_INC_LINK);
 347         f2fs_lock_op(sbi);
 348         err = f2fs_add_link(dentry, inode);
 349         if (err)
 350                 goto out;
 351         f2fs_unlock_op(sbi);
 352
 353         d_instantiate(dentry, inode);
 354
 355         if (IS_DIRSYNC(dir))
 356                 f2fs_sync_fs(sbi->sb, 1);
 357         return 0;
 358 out:
 359         clear_inode_flag(inode, FI_INC_LINK);
 360         iput(inode);
 361         f2fs_unlock_op(sbi);
 362         return err;
 363 }
 364
 365 struct dentry *f2fs_get_parent(struct dentry *child)
 366 {
 367         struct qstr dotdot = QSTR_INIT("..", 2);
 368         struct page *page;
 369         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 370         if (!ino) {
 371                 if (IS_ERR(page))
 372                         return ERR_CAST(page);
 373                 return ERR_PTR(-ENOENT);
 374         }
 375         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 376 }
 377
 378 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 379 {
 380         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 381         struct qstr dot = QSTR_INIT(".", 1);
 382         struct qstr dotdot = QSTR_INIT("..", 2);
 383         struct f2fs_dir_entry *de;
 384         struct page *page;
 385         int err = 0;
 386
 387         if (f2fs_readonly(sbi->sb)) {
 388                 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
 389                           dir->i_ino, pino);
 390                 return 0;
 391         }
 392
 393         err = dquot_initialize(dir);
 394         if (err)
 395                 return err;
 396
 397         f2fs_balance_fs(sbi, true);
 398
 399         f2fs_lock_op(sbi);
 400
 401         de = f2fs_find_entry(dir, &dot, &page);
 402         if (de) {
 403                 f2fs_put_page(page, 0);
 404         } else if (IS_ERR(page)) {
 405                 err = PTR_ERR(page);
 406                 goto out;
 407         } else {
 408                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 409                 if (err)
 410                         goto out;
 411         }
 412
 413         de = f2fs_find_entry(dir, &dotdot, &page);
 414         if (de)
 415                 f2fs_put_page(page, 0);
 416         else if (IS_ERR(page))
 417                 err = PTR_ERR(page);
 418         else
 419                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 420 out:
 421         if (!err)
 422                 clear_inode_flag(dir, FI_INLINE_DOTS);
 423
 424         f2fs_unlock_op(sbi);
 425         return err;
 426 }
 427
 428 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 429                 unsigned int flags)
 430 {
 431         struct inode *inode = NULL;
 432         struct f2fs_dir_entry *de;
 433         struct page *page;
 434         struct dentry *new;
 435         nid_t ino = -1;
 436         int err = 0;
 437         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 438
 439         trace_f2fs_lookup_start(dir, dentry, flags);
 440
 441         err = fscrypt_prepare_lookup(dir, dentry, flags);
 442         if (err)
 443                 goto out;
 444
 445         if (dentry->d_name.len > F2FS_NAME_LEN) {
 446                 err = -ENAMETOOLONG;
 447                 goto out;
 448         }
 449
 450         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 451         if (!de) {
 452                 if (IS_ERR(page)) {
 453                         err = PTR_ERR(page);
 454                         goto out;
 455                 }
 456                 goto out_splice;
 457         }
 458
 459         ino = le32_to_cpu(de->ino);
 460         f2fs_put_page(page, 0);
 461
 462         inode = f2fs_iget(dir->i_sb, ino);
 463         if (IS_ERR(inode)) {
 464                 err = PTR_ERR(inode);
 465                 goto out;
 466         }
 467
 468         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 469                 err = __recover_dot_dentries(dir, root_ino);
 470                 if (err)
 471                         goto out_iput;
 472         }
 473
 474         if (f2fs_has_inline_dots(inode)) {
 475                 err = __recover_dot_dentries(inode, dir->i_ino);
 476                 if (err)
 477                         goto out_iput;
 478         }
 479         if (f2fs_encrypted_inode(dir) &&
 480             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 481             !fscrypt_has_permitted_context(dir, inode)) {
 482                 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
 483                           dir->i_ino, inode->i_ino);
 484                 err = -EPERM;
 485                 goto out_iput;
 486         }
 487 out_splice:
 488         new = d_splice_alias(inode, dentry);
 489         if (IS_ERR(new))
 490                 err = PTR_ERR(new);
 491         trace_f2fs_lookup_end(dir, dentry, ino, err);
 492         return new;
 493 out_iput:
 494         iput(inode);
 495 out:
 496         trace_f2fs_lookup_end(dir, dentry, ino, err);
 497         return ERR_PTR(err);
 498 }
 499
 500 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 501 {
 502         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 503         struct inode *inode = d_inode(dentry);
 504         struct f2fs_dir_entry *de;
 505         struct page *page;
 506         int err = -ENOENT;
 507
 508         trace_f2fs_unlink_enter(dir, dentry);
 509
 510         if (unlikely(f2fs_cp_error(sbi)))
 511                 return -EIO;
 512
 513         err = dquot_initialize(dir);
 514         if (err)
 515                 return err;
 516         err = dquot_initialize(inode);
 517         if (err)
 518                 return err;
 519
 520         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 521         if (!de) {
 522                 if (IS_ERR(page))
 523                         err = PTR_ERR(page);
 524                 goto fail;
 525         }
 526
 527         f2fs_balance_fs(sbi, true);
 528
 529         f2fs_lock_op(sbi);
 530         err = f2fs_acquire_orphan_inode(sbi);
 531         if (err) {
 532                 f2fs_unlock_op(sbi);
 533                 f2fs_put_page(page, 0);
 534                 goto fail;
 535         }
 536         f2fs_delete_entry(de, page, dir, inode);
 537         f2fs_unlock_op(sbi);
 538
 539         if (IS_DIRSYNC(dir))
 540                 f2fs_sync_fs(sbi->sb, 1);
 541 fail:
 542         trace_f2fs_unlink_exit(inode, err);
 543         return err;
 544 }
 545
 546 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
 547 {
 548         const char *link = page_follow_link_light(dentry, cookie);
 549         if (!IS_ERR(link) && !*link) {
 550                 /* this is broken symlink case */
 551                 page_put_link(NULL, *cookie);
 552                 link = ERR_PTR(-ENOENT);
 553         }
 554         return link;
 555 }
 556
 557 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 558                                         const char *symname)
 559 {
 560         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 561         struct inode *inode;
 562         size_t len = strlen(symname);
 563         struct fscrypt_str disk_link;
 564         int err;
 565
 566         if (unlikely(f2fs_cp_error(sbi)))
 567                 return -EIO;
 568         err = f2fs_is_checkpoint_ready(sbi);
 569         if (err)
 570                 return err;
 571
 572         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 573                                       &disk_link);
 574         if (err)
 575                 return err;
 576
 577         err = dquot_initialize(dir);
 578         if (err)
 579                 return err;
 580
 581         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 582         if (IS_ERR(inode))
 583                 return PTR_ERR(inode);
 584
 585         if (IS_ENCRYPTED(inode))
 586                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 587         else
 588                 inode->i_op = &f2fs_symlink_inode_operations;
 589         inode_nohighmem(inode);
 590         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 591
 592         f2fs_lock_op(sbi);
 593         err = f2fs_add_link(dentry, inode);
 594         if (err)
 595                 goto out_f2fs_handle_failed_inode;
 596         f2fs_unlock_op(sbi);
 597         f2fs_alloc_nid_done(sbi, inode->i_ino);
 598
 599         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 600         if (err)
 601                 goto err_out;
 602
 603         err = page_symlink(inode, disk_link.name, disk_link.len);
 604
 605 err_out:
 606         d_instantiate_new(dentry, inode);
 607
 608         /*
 609          * Let's flush symlink data in order to avoid broken symlink as much as
 610          * possible. Nevertheless, fsyncing is the best way, but there is no
 611          * way to get a file descriptor in order to flush that.
 612          *
 613          * Note that, it needs to do dir->fsync to make this recoverable.
 614          * If the symlink path is stored into inline_data, there is no
 615          * performance regression.
 616          */
 617         if (!err) {
 618                 filemap_write_and_wait_range(inode->i_mapping, 0,
 619                                                         disk_link.len - 1);
 620
 621                 if (IS_DIRSYNC(dir))
 622                         f2fs_sync_fs(sbi->sb, 1);
 623         } else {
 624                 f2fs_unlink(dir, dentry);
 625         }
 626
 627         f2fs_balance_fs(sbi, true);
 628         goto out_free_encrypted_link;
 629
 630 out_f2fs_handle_failed_inode:
 631         f2fs_handle_failed_inode(inode);
 632 out_free_encrypted_link:
 633         if (disk_link.name != (unsigned char *)symname)
 634                 kvfree(disk_link.name);
 635         return err;
 636 }
 637
 638 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 639 {
 640         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 641         struct inode *inode;
 642         int err;
 643
 644         if (unlikely(f2fs_cp_error(sbi)))
 645                 return -EIO;
 646
 647         err = dquot_initialize(dir);
 648         if (err)
 649                 return err;
 650
 651         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 652         if (IS_ERR(inode))
 653                 return PTR_ERR(inode);
 654
 655         inode->i_op = &f2fs_dir_inode_operations;
 656         inode->i_fop = &f2fs_dir_operations;
 657         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 658         inode_nohighmem(inode);
 659
 660         set_inode_flag(inode, FI_INC_LINK);
 661         f2fs_lock_op(sbi);
 662         err = f2fs_add_link(dentry, inode);
 663         if (err)
 664                 goto out_fail;
 665         f2fs_unlock_op(sbi);
 666
 667         f2fs_alloc_nid_done(sbi, inode->i_ino);
 668
 669         d_instantiate_new(dentry, inode);
 670
 671         if (IS_DIRSYNC(dir))
 672                 f2fs_sync_fs(sbi->sb, 1);
 673
 674         f2fs_balance_fs(sbi, true);
 675         return 0;
 676
 677 out_fail:
 678         clear_inode_flag(inode, FI_INC_LINK);
 679         f2fs_handle_failed_inode(inode);
 680         return err;
 681 }
 682
 683 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 684 {
 685         struct inode *inode = d_inode(dentry);
 686         if (f2fs_empty_dir(inode))
 687                 return f2fs_unlink(dir, dentry);
 688         return -ENOTEMPTY;
 689 }
 690
 691 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 692                                 umode_t mode, dev_t rdev)
 693 {
 694         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 695         struct inode *inode;
 696         int err = 0;
 697
 698         if (unlikely(f2fs_cp_error(sbi)))
 699                 return -EIO;
 700         err = f2fs_is_checkpoint_ready(sbi);
 701         if (err)
 702                 return err;
 703
 704         err = dquot_initialize(dir);
 705         if (err)
 706                 return err;
 707
 708         inode = f2fs_new_inode(dir, mode);
 709         if (IS_ERR(inode))
 710                 return PTR_ERR(inode);
 711
 712         init_special_inode(inode, inode->i_mode, rdev);
 713         inode->i_op = &f2fs_special_inode_operations;
 714
 715         f2fs_lock_op(sbi);
 716         err = f2fs_add_link(dentry, inode);
 717         if (err)
 718                 goto out;
 719         f2fs_unlock_op(sbi);
 720
 721         f2fs_alloc_nid_done(sbi, inode->i_ino);
 722
 723         d_instantiate_new(dentry, inode);
 724
 725         if (IS_DIRSYNC(dir))
 726                 f2fs_sync_fs(sbi->sb, 1);
 727
 728         f2fs_balance_fs(sbi, true);
 729         return 0;
 730 out:
 731         f2fs_handle_failed_inode(inode);
 732         return err;
 733 }
 734
 735 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 736                                         umode_t mode, struct inode **whiteout)
 737 {
 738         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 739         struct inode *inode;
 740         int err;
 741
 742         err = dquot_initialize(dir);
 743         if (err)
 744                 return err;
 745
 746         inode = f2fs_new_inode(dir, mode);
 747         if (IS_ERR(inode))
 748                 return PTR_ERR(inode);
 749
 750         if (whiteout) {
 751                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 752                 inode->i_op = &f2fs_special_inode_operations;
 753         } else {
 754                 inode->i_op = &f2fs_file_inode_operations;
 755                 inode->i_fop = &f2fs_file_operations;
 756                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 757         }
 758
 759         f2fs_lock_op(sbi);
 760         err = f2fs_acquire_orphan_inode(sbi);
 761         if (err)
 762                 goto out;
 763
 764         err = f2fs_do_tmpfile(inode, dir);
 765         if (err)
 766                 goto release_out;
 767
 768         /*
 769          * add this non-linked tmpfile to orphan list, in this way we could
 770          * remove all unused data of tmpfile after abnormal power-off.
 771          */
 772         f2fs_add_orphan_inode(inode);
 773         f2fs_alloc_nid_done(sbi, inode->i_ino);
 774
 775         if (whiteout) {
 776                 f2fs_i_links_write(inode, false);
 777                 *whiteout = inode;
 778         } else {
 779                 d_tmpfile(dentry, inode);
 780         }
 781         /* link_count was changed by d_tmpfile as well. */
 782         f2fs_unlock_op(sbi);
 783         unlock_new_inode(inode);
 784
 785         f2fs_balance_fs(sbi, true);
 786         return 0;
 787
 788 release_out:
 789         f2fs_release_orphan_inode(sbi);
 790 out:
 791         f2fs_handle_failed_inode(inode);
 792         return err;
 793 }
 794
 795 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 796 {
 797         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 798
 799         if (unlikely(f2fs_cp_error(sbi)))
 800                 return -EIO;
 801
 802         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 803                 int err = fscrypt_get_encryption_info(dir);
 804                 if (err)
 805                         return err;
 806         }
 807
 808         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 809 }
 810
 811 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 812 {
 813         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 814                 return -EIO;
 815
 816         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 817 }
 818
 819 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 820                         struct inode *new_dir, struct dentry *new_dentry,
 821                         unsigned int flags)
 822 {
 823         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 824         struct inode *old_inode = d_inode(old_dentry);
 825         struct inode *new_inode = d_inode(new_dentry);
 826         struct inode *whiteout = NULL;
 827         struct page *old_dir_page;
 828         struct page *old_page, *new_page = NULL;
 829         struct f2fs_dir_entry *old_dir_entry = NULL;
 830         struct f2fs_dir_entry *old_entry;
 831         struct f2fs_dir_entry *new_entry;
 832         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 833         int err;
 834
 835         if (unlikely(f2fs_cp_error(sbi)))
 836                 return -EIO;
 837         err = f2fs_is_checkpoint_ready(sbi);
 838         if (err)
 839                 return err;
 840
 841         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 842                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 843                         F2FS_I(old_dentry->d_inode)->i_projid)))
 844                 return -EXDEV;
 845
 846         err = dquot_initialize(old_dir);
 847         if (err)
 848                 goto out;
 849
 850         err = dquot_initialize(new_dir);
 851         if (err)
 852                 goto out;
 853
 854         if (new_inode) {
 855                 err = dquot_initialize(new_inode);
 856                 if (err)
 857                         goto out;
 858         }
 859
 860         err = -ENOENT;
 861         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 862         if (!old_entry) {
 863                 if (IS_ERR(old_page))
 864                         err = PTR_ERR(old_page);
 865                 goto out;
 866         }
 867
 868         if (S_ISDIR(old_inode->i_mode)) {
 869                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 870                 if (!old_dir_entry) {
 871                         if (IS_ERR(old_dir_page))
 872                                 err = PTR_ERR(old_dir_page);
 873                         goto out_old;
 874                 }
 875         }
 876
 877         if (flags & RENAME_WHITEOUT) {
 878                 err = f2fs_create_whiteout(old_dir, &whiteout);
 879                 if (err)
 880                         goto out_dir;
 881         }
 882
 883         if (new_inode) {
 884
 885                 err = -ENOTEMPTY;
 886                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 887                         goto out_whiteout;
 888
 889                 err = -ENOENT;
 890                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 891                                                 &new_page);
 892                 if (!new_entry) {
 893                         if (IS_ERR(new_page))
 894                                 err = PTR_ERR(new_page);
 895                         goto out_whiteout;
 896                 }
 897
 898                 f2fs_balance_fs(sbi, true);
 899
 900                 f2fs_lock_op(sbi);
 901
 902                 err = f2fs_acquire_orphan_inode(sbi);
 903                 if (err)
 904                         goto put_out_dir;
 905
 906                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 907
 908                 new_inode->i_ctime = current_time(new_inode);
 909                 down_write(&F2FS_I(new_inode)->i_sem);
 910                 if (old_dir_entry)
 911                         f2fs_i_links_write(new_inode, false);
 912                 f2fs_i_links_write(new_inode, false);
 913                 up_write(&F2FS_I(new_inode)->i_sem);
 914
 915                 if (!new_inode->i_nlink)
 916                         f2fs_add_orphan_inode(new_inode);
 917                 else
 918                         f2fs_release_orphan_inode(sbi);
 919         } else {
 920                 f2fs_balance_fs(sbi, true);
 921
 922                 f2fs_lock_op(sbi);
 923
 924                 err = f2fs_add_link(new_dentry, old_inode);
 925                 if (err) {
 926                         f2fs_unlock_op(sbi);
 927                         goto out_whiteout;
 928                 }
 929
 930                 if (old_dir_entry)
 931                         f2fs_i_links_write(new_dir, true);
 932
 933                 /*
 934                  * old entry and new entry can locate in the same inline
 935                  * dentry in inode, when attaching new entry in inline dentry,
 936                  * it could force inline dentry conversion, after that,
 937                  * old_entry and old_page will point to wrong address, in
 938                  * order to avoid this, let's do the check and update here.
 939                  */
 940                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 941                         f2fs_put_page(old_page, 0);
 942                         old_page = NULL;
 943
 944                         old_entry = f2fs_find_entry(old_dir,
 945                                                 &old_dentry->d_name, &old_page);
 946                         if (!old_entry) {
 947                                 err = -ENOENT;
 948                                 if (IS_ERR(old_page))
 949                                         err = PTR_ERR(old_page);
 950                                 f2fs_unlock_op(sbi);
 951                                 goto out_whiteout;
 952                         }
 953                 }
 954         }
 955
 956         down_write(&F2FS_I(old_inode)->i_sem);
 957         if (!old_dir_entry || whiteout)
 958                 file_lost_pino(old_inode);
 959         else
 960                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 961         up_write(&F2FS_I(old_inode)->i_sem);
 962
 963         old_inode->i_ctime = current_time(old_inode);
 964         f2fs_mark_inode_dirty_sync(old_inode, false);
 965
 966         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 967
 968         if (whiteout) {
 969                 whiteout->i_state |= I_LINKABLE;
 970                 set_inode_flag(whiteout, FI_INC_LINK);
 971                 err = f2fs_add_link(old_dentry, whiteout);
 972                 if (err)
 973                         goto put_out_dir;
 974                 whiteout->i_state &= ~I_LINKABLE;
 975                 iput(whiteout);
 976         }
 977
 978         if (old_dir_entry) {
 979                 if (old_dir != new_dir && !whiteout)
 980                         f2fs_set_link(old_inode, old_dir_entry,
 981                                                 old_dir_page, new_dir);
 982                 else
 983                         f2fs_put_page(old_dir_page, 0);
 984                 f2fs_i_links_write(old_dir, false);
 985         }
 986         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 987                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 988                 if (S_ISDIR(old_inode->i_mode))
 989                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
 990                                                         TRANS_DIR_INO);
 991         }
 992
 993         f2fs_unlock_op(sbi);
 994
 995         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 996                 f2fs_sync_fs(sbi->sb, 1);
 997
 998         f2fs_update_time(sbi, REQ_TIME);
 999         return 0;
1000
1001 put_out_dir:
1002         f2fs_unlock_op(sbi);
1003         if (new_page)
1004                 f2fs_put_page(new_page, 0);
1005 out_whiteout:
1006         if (whiteout)
1007                 iput(whiteout);
1008 out_dir:
1009         if (old_dir_entry)
1010                 f2fs_put_page(old_dir_page, 0);
1011 out_old:
1012         f2fs_put_page(old_page, 0);
1013 out:
1014         return err;
1015 }
1016
1017 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1018                              struct inode *new_dir, struct dentry *new_dentry)
1019 {
1020         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1021         struct inode *old_inode = d_inode(old_dentry);
1022         struct inode *new_inode = d_inode(new_dentry);
1023         struct page *old_dir_page, *new_dir_page;
1024         struct page *old_page, *new_page;
1025         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1026         struct f2fs_dir_entry *old_entry, *new_entry;
1027         int old_nlink = 0, new_nlink = 0;
1028         int err;
1029
1030         if (unlikely(f2fs_cp_error(sbi)))
1031                 return -EIO;
1032         err = f2fs_is_checkpoint_ready(sbi);
1033         if (err)
1034                 return err;
1035
1036         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1037                         !projid_eq(F2FS_I(new_dir)->i_projid,
1038                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1039             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1040                         !projid_eq(F2FS_I(old_dir)->i_projid,
1041                         F2FS_I(new_dentry->d_inode)->i_projid)))
1042                 return -EXDEV;
1043
1044         err = dquot_initialize(old_dir);
1045         if (err)
1046                 goto out;
1047
1048         err = dquot_initialize(new_dir);
1049         if (err)
1050                 goto out;
1051
1052         err = -ENOENT;
1053         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1054         if (!old_entry) {
1055                 if (IS_ERR(old_page))
1056                         err = PTR_ERR(old_page);
1057                 goto out;
1058         }
1059
1060         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1061         if (!new_entry) {
1062                 if (IS_ERR(new_page))
1063                         err = PTR_ERR(new_page);
1064                 goto out_old;
1065         }
1066
1067         /* prepare for updating ".." directory entry info later */
1068         if (old_dir != new_dir) {
1069                 if (S_ISDIR(old_inode->i_mode)) {
1070                         old_dir_entry = f2fs_parent_dir(old_inode,
1071                                                         &old_dir_page);
1072                         if (!old_dir_entry) {
1073                                 if (IS_ERR(old_dir_page))
1074                                         err = PTR_ERR(old_dir_page);
1075                                 goto out_new;
1076                         }
1077                 }
1078
1079                 if (S_ISDIR(new_inode->i_mode)) {
1080                         new_dir_entry = f2fs_parent_dir(new_inode,
1081                                                         &new_dir_page);
1082                         if (!new_dir_entry) {
1083                                 if (IS_ERR(new_dir_page))
1084                                         err = PTR_ERR(new_dir_page);
1085                                 goto out_old_dir;
1086                         }
1087                 }
1088         }
1089
1090         /*
1091          * If cross rename between file and directory those are not
1092          * in the same directory, we will inc nlink of file's parent
1093          * later, so we should check upper boundary of its nlink.
1094          */
1095         if ((!old_dir_entry || !new_dir_entry) &&
1096                                 old_dir_entry != new_dir_entry) {
1097                 old_nlink = old_dir_entry ? -1 : 1;
1098                 new_nlink = -old_nlink;
1099                 err = -EMLINK;
1100                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1101                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1102                         goto out_new_dir;
1103         }
1104
1105         f2fs_balance_fs(sbi, true);
1106
1107         f2fs_lock_op(sbi);
1108
1109         /* update ".." directory entry info of old dentry */
1110         if (old_dir_entry)
1111                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1112
1113         /* update ".." directory entry info of new dentry */
1114         if (new_dir_entry)
1115                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1116
1117         /* update directory entry info of old dir inode */
1118         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1119
1120         down_write(&F2FS_I(old_inode)->i_sem);
1121         file_lost_pino(old_inode);
1122         up_write(&F2FS_I(old_inode)->i_sem);
1123
1124         old_dir->i_ctime = current_time(old_dir);
1125         if (old_nlink) {
1126                 down_write(&F2FS_I(old_dir)->i_sem);
1127                 f2fs_i_links_write(old_dir, old_nlink > 0);
1128                 up_write(&F2FS_I(old_dir)->i_sem);
1129         }
1130         f2fs_mark_inode_dirty_sync(old_dir, false);
1131
1132         /* update directory entry info of new dir inode */
1133         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1134
1135         down_write(&F2FS_I(new_inode)->i_sem);
1136         file_lost_pino(new_inode);
1137         up_write(&F2FS_I(new_inode)->i_sem);
1138
1139         new_dir->i_ctime = current_time(new_dir);
1140         if (new_nlink) {
1141                 down_write(&F2FS_I(new_dir)->i_sem);
1142                 f2fs_i_links_write(new_dir, new_nlink > 0);
1143                 up_write(&F2FS_I(new_dir)->i_sem);
1144         }
1145         f2fs_mark_inode_dirty_sync(new_dir, false);
1146
1147         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1148                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1149                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1150         }
1151
1152         f2fs_unlock_op(sbi);
1153
1154         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1155                 f2fs_sync_fs(sbi->sb, 1);
1156
1157         f2fs_update_time(sbi, REQ_TIME);
1158         return 0;
1159 out_new_dir:
1160         if (new_dir_entry) {
1161                 f2fs_put_page(new_dir_page, 0);
1162         }
1163 out_old_dir:
1164         if (old_dir_entry) {
1165                 f2fs_put_page(old_dir_page, 0);
1166         }
1167 out_new:
1168         f2fs_put_page(new_page, 0);
1169 out_old:
1170         f2fs_put_page(old_page, 0);
1171 out:
1172         return err;
1173 }
1174
1175 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1176                         struct inode *new_dir, struct dentry *new_dentry,
1177                         unsigned int flags)
1178 {
1179         int err;
1180
1181         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1182                 return -EINVAL;
1183
1184         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1185                                      flags);
1186         if (err)
1187                 return err;
1188
1189         if (flags & RENAME_EXCHANGE) {
1190                 return f2fs_cross_rename(old_dir, old_dentry,
1191                                          new_dir, new_dentry);
1192         }
1193         /*
1194          * VFS has already handled the new dentry existence case,
1195          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1196          */
1197         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1198 }
1199
1200 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1201 {
1202         struct inode *inode = d_inode(dentry);
1203         struct page *page;
1204         void *target;
1205
1206         if (!dentry)
1207                 return ERR_PTR(-ECHILD);
1208
1209         page = read_mapping_page(inode->i_mapping, 0, NULL);
1210         if (IS_ERR(page))
1211                 return ERR_CAST(page);
1212
1213         target = fscrypt_get_symlink(inode, page_address(page),
1214                                      inode->i_sb->s_blocksize);
1215         put_page(page);
1216         return *cookie = target;
1217 }
1218
1219 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1220         .readlink       = generic_readlink,
1221         .follow_link    = f2fs_encrypted_follow_link,
1222         .put_link       = kfree_put_link,
1223         .getattr        = f2fs_getattr,
1224         .setattr        = f2fs_setattr,
1225 #ifdef CONFIG_F2FS_FS_XATTR
1226         .setxattr       = generic_setxattr,
1227         .getxattr       = generic_getxattr,
1228         .listxattr      = f2fs_listxattr,
1229         .removexattr    = generic_removexattr,
1230 #endif
1231 };
1232
1233 const struct inode_operations f2fs_dir_inode_operations = {
1234         .create         = f2fs_create,
1235         .lookup         = f2fs_lookup,
1236         .link           = f2fs_link,
1237         .unlink         = f2fs_unlink,
1238         .symlink        = f2fs_symlink,
1239         .mkdir          = f2fs_mkdir,
1240         .rmdir          = f2fs_rmdir,
1241         .mknod          = f2fs_mknod,
1242         .rename2        = f2fs_rename2,
1243         .tmpfile        = f2fs_tmpfile,
1244         .getattr        = f2fs_getattr,
1245         .setattr        = f2fs_setattr,
1246         .get_acl        = f2fs_get_acl,
1247         .set_acl        = f2fs_set_acl,
1248 #ifdef CONFIG_F2FS_FS_XATTR
1249         .setxattr       = generic_setxattr,
1250         .getxattr       = generic_getxattr,
1251         .listxattr      = f2fs_listxattr,
1252         .removexattr    = generic_removexattr,
1253 #endif
1254 };
1255
1256 const struct inode_operations f2fs_symlink_inode_operations = {
1257         .readlink       = generic_readlink,
1258         .follow_link    = f2fs_follow_link,
1259         .put_link       = page_put_link,
1260         .getattr        = f2fs_getattr,
1261         .setattr        = f2fs_setattr,
1262 #ifdef CONFIG_F2FS_FS_XATTR
1263         .setxattr       = generic_setxattr,
1264         .getxattr       = generic_getxattr,
1265         .listxattr      = f2fs_listxattr,
1266         .removexattr    = generic_removexattr,
1267 #endif
1268 };
1269
1270 const struct inode_operations f2fs_special_inode_operations = {
1271         .getattr        = f2fs_getattr,
1272         .setattr        = f2fs_setattr,
1273         .get_acl        = f2fs_get_acl,
1274         .set_acl        = f2fs_set_acl,
1275 #ifdef CONFIG_F2FS_FS_XATTR
1276         .setxattr       = generic_setxattr,
1277         .getxattr       = generic_getxattr,
1278         .listxattr      = f2fs_listxattr,
1279         .removexattr    = generic_removexattr,
1280 #endif
1281 };