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_msg(sbi->sb, KERN_INFO,
 389                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 390                         "in readonly mountpoint", dir->i_ino, pino);
 391                 return 0;
 392         }
 393
 394         err = dquot_initialize(dir);
 395         if (err)
 396                 return err;
 397
 398         f2fs_balance_fs(sbi, true);
 399
 400         f2fs_lock_op(sbi);
 401
 402         de = f2fs_find_entry(dir, &dot, &page);
 403         if (de) {
 404                 f2fs_put_page(page, 0);
 405         } else if (IS_ERR(page)) {
 406                 err = PTR_ERR(page);
 407                 goto out;
 408         } else {
 409                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 410                 if (err)
 411                         goto out;
 412         }
 413
 414         de = f2fs_find_entry(dir, &dotdot, &page);
 415         if (de)
 416                 f2fs_put_page(page, 0);
 417         else if (IS_ERR(page))
 418                 err = PTR_ERR(page);
 419         else
 420                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 421 out:
 422         if (!err)
 423                 clear_inode_flag(dir, FI_INLINE_DOTS);
 424
 425         f2fs_unlock_op(sbi);
 426         return err;
 427 }
 428
 429 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 430                 unsigned int flags)
 431 {
 432         struct inode *inode = NULL;
 433         struct f2fs_dir_entry *de;
 434         struct page *page;
 435         struct dentry *new;
 436         nid_t ino = -1;
 437         int err = 0;
 438         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 439
 440         trace_f2fs_lookup_start(dir, dentry, flags);
 441
 442         err = fscrypt_prepare_lookup(dir, dentry, flags);
 443         if (err)
 444                 goto out;
 445
 446         if (dentry->d_name.len > F2FS_NAME_LEN) {
 447                 err = -ENAMETOOLONG;
 448                 goto out;
 449         }
 450
 451         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 452         if (!de) {
 453                 if (IS_ERR(page)) {
 454                         err = PTR_ERR(page);
 455                         goto out;
 456                 }
 457                 goto out_splice;
 458         }
 459
 460         ino = le32_to_cpu(de->ino);
 461         f2fs_put_page(page, 0);
 462
 463         inode = f2fs_iget(dir->i_sb, ino);
 464         if (IS_ERR(inode)) {
 465                 err = PTR_ERR(inode);
 466                 goto out;
 467         }
 468
 469         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 470                 err = __recover_dot_dentries(dir, root_ino);
 471                 if (err)
 472                         goto out_iput;
 473         }
 474
 475         if (f2fs_has_inline_dots(inode)) {
 476                 err = __recover_dot_dentries(inode, dir->i_ino);
 477                 if (err)
 478                         goto out_iput;
 479         }
 480         if (f2fs_encrypted_inode(dir) &&
 481             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 482             !fscrypt_has_permitted_context(dir, inode)) {
 483                 f2fs_msg(inode->i_sb, KERN_WARNING,
 484                          "Inconsistent encryption contexts: %lu/%lu",
 485                          dir->i_ino, inode->i_ino);
 486                 err = -EPERM;
 487                 goto out_iput;
 488         }
 489 out_splice:
 490         new = d_splice_alias(inode, dentry);
 491         if (IS_ERR(new))
 492                 err = PTR_ERR(new);
 493         trace_f2fs_lookup_end(dir, dentry, ino, err);
 494         return new;
 495 out_iput:
 496         iput(inode);
 497 out:
 498         trace_f2fs_lookup_end(dir, dentry, ino, err);
 499         return ERR_PTR(err);
 500 }
 501
 502 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 503 {
 504         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 505         struct inode *inode = d_inode(dentry);
 506         struct f2fs_dir_entry *de;
 507         struct page *page;
 508         int err = -ENOENT;
 509
 510         trace_f2fs_unlink_enter(dir, dentry);
 511
 512         if (unlikely(f2fs_cp_error(sbi)))
 513                 return -EIO;
 514
 515         err = dquot_initialize(dir);
 516         if (err)
 517                 return err;
 518         err = dquot_initialize(inode);
 519         if (err)
 520                 return err;
 521
 522         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 523         if (!de) {
 524                 if (IS_ERR(page))
 525                         err = PTR_ERR(page);
 526                 goto fail;
 527         }
 528
 529         f2fs_balance_fs(sbi, true);
 530
 531         f2fs_lock_op(sbi);
 532         err = f2fs_acquire_orphan_inode(sbi);
 533         if (err) {
 534                 f2fs_unlock_op(sbi);
 535                 f2fs_put_page(page, 0);
 536                 goto fail;
 537         }
 538         f2fs_delete_entry(de, page, dir, inode);
 539         f2fs_unlock_op(sbi);
 540
 541         if (IS_DIRSYNC(dir))
 542                 f2fs_sync_fs(sbi->sb, 1);
 543 fail:
 544         trace_f2fs_unlink_exit(inode, err);
 545         return err;
 546 }
 547
 548 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
 549 {
 550         const char *link = page_follow_link_light(dentry, cookie);
 551         if (!IS_ERR(link) && !*link) {
 552                 /* this is broken symlink case */
 553                 page_put_link(NULL, *cookie);
 554                 link = ERR_PTR(-ENOENT);
 555         }
 556         return link;
 557 }
 558
 559 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 560                                         const char *symname)
 561 {
 562         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 563         struct inode *inode;
 564         size_t len = strlen(symname);
 565         struct fscrypt_str disk_link;
 566         int err;
 567
 568         if (unlikely(f2fs_cp_error(sbi)))
 569                 return -EIO;
 570         err = f2fs_is_checkpoint_ready(sbi);
 571         if (err)
 572                 return err;
 573
 574         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 575                                       &disk_link);
 576         if (err)
 577                 return err;
 578
 579         err = dquot_initialize(dir);
 580         if (err)
 581                 return err;
 582
 583         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 584         if (IS_ERR(inode))
 585                 return PTR_ERR(inode);
 586
 587         if (IS_ENCRYPTED(inode))
 588                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 589         else
 590                 inode->i_op = &f2fs_symlink_inode_operations;
 591         inode_nohighmem(inode);
 592         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 593
 594         f2fs_lock_op(sbi);
 595         err = f2fs_add_link(dentry, inode);
 596         if (err)
 597                 goto out_f2fs_handle_failed_inode;
 598         f2fs_unlock_op(sbi);
 599         f2fs_alloc_nid_done(sbi, inode->i_ino);
 600
 601         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 602         if (err)
 603                 goto err_out;
 604
 605         err = page_symlink(inode, disk_link.name, disk_link.len);
 606
 607 err_out:
 608         d_instantiate_new(dentry, inode);
 609
 610         /*
 611          * Let's flush symlink data in order to avoid broken symlink as much as
 612          * possible. Nevertheless, fsyncing is the best way, but there is no
 613          * way to get a file descriptor in order to flush that.
 614          *
 615          * Note that, it needs to do dir->fsync to make this recoverable.
 616          * If the symlink path is stored into inline_data, there is no
 617          * performance regression.
 618          */
 619         if (!err) {
 620                 filemap_write_and_wait_range(inode->i_mapping, 0,
 621                                                         disk_link.len - 1);
 622
 623                 if (IS_DIRSYNC(dir))
 624                         f2fs_sync_fs(sbi->sb, 1);
 625         } else {
 626                 f2fs_unlink(dir, dentry);
 627         }
 628
 629         f2fs_balance_fs(sbi, true);
 630         goto out_free_encrypted_link;
 631
 632 out_f2fs_handle_failed_inode:
 633         f2fs_handle_failed_inode(inode);
 634 out_free_encrypted_link:
 635         if (disk_link.name != (unsigned char *)symname)
 636                 kvfree(disk_link.name);
 637         return err;
 638 }
 639
 640 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 641 {
 642         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 643         struct inode *inode;
 644         int err;
 645
 646         if (unlikely(f2fs_cp_error(sbi)))
 647                 return -EIO;
 648
 649         err = dquot_initialize(dir);
 650         if (err)
 651                 return err;
 652
 653         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 654         if (IS_ERR(inode))
 655                 return PTR_ERR(inode);
 656
 657         inode->i_op = &f2fs_dir_inode_operations;
 658         inode->i_fop = &f2fs_dir_operations;
 659         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 660         inode_nohighmem(inode);
 661
 662         set_inode_flag(inode, FI_INC_LINK);
 663         f2fs_lock_op(sbi);
 664         err = f2fs_add_link(dentry, inode);
 665         if (err)
 666                 goto out_fail;
 667         f2fs_unlock_op(sbi);
 668
 669         f2fs_alloc_nid_done(sbi, inode->i_ino);
 670
 671         d_instantiate_new(dentry, inode);
 672
 673         if (IS_DIRSYNC(dir))
 674                 f2fs_sync_fs(sbi->sb, 1);
 675
 676         f2fs_balance_fs(sbi, true);
 677         return 0;
 678
 679 out_fail:
 680         clear_inode_flag(inode, FI_INC_LINK);
 681         f2fs_handle_failed_inode(inode);
 682         return err;
 683 }
 684
 685 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 686 {
 687         struct inode *inode = d_inode(dentry);
 688         if (f2fs_empty_dir(inode))
 689                 return f2fs_unlink(dir, dentry);
 690         return -ENOTEMPTY;
 691 }
 692
 693 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 694                                 umode_t mode, dev_t rdev)
 695 {
 696         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 697         struct inode *inode;
 698         int err = 0;
 699
 700         if (unlikely(f2fs_cp_error(sbi)))
 701                 return -EIO;
 702         err = f2fs_is_checkpoint_ready(sbi);
 703         if (err)
 704                 return err;
 705
 706         err = dquot_initialize(dir);
 707         if (err)
 708                 return err;
 709
 710         inode = f2fs_new_inode(dir, mode);
 711         if (IS_ERR(inode))
 712                 return PTR_ERR(inode);
 713
 714         init_special_inode(inode, inode->i_mode, rdev);
 715         inode->i_op = &f2fs_special_inode_operations;
 716
 717         f2fs_lock_op(sbi);
 718         err = f2fs_add_link(dentry, inode);
 719         if (err)
 720                 goto out;
 721         f2fs_unlock_op(sbi);
 722
 723         f2fs_alloc_nid_done(sbi, inode->i_ino);
 724
 725         d_instantiate_new(dentry, inode);
 726
 727         if (IS_DIRSYNC(dir))
 728                 f2fs_sync_fs(sbi->sb, 1);
 729
 730         f2fs_balance_fs(sbi, true);
 731         return 0;
 732 out:
 733         f2fs_handle_failed_inode(inode);
 734         return err;
 735 }
 736
 737 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 738                                         umode_t mode, struct inode **whiteout)
 739 {
 740         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 741         struct inode *inode;
 742         int err;
 743
 744         err = dquot_initialize(dir);
 745         if (err)
 746                 return err;
 747
 748         inode = f2fs_new_inode(dir, mode);
 749         if (IS_ERR(inode))
 750                 return PTR_ERR(inode);
 751
 752         if (whiteout) {
 753                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 754                 inode->i_op = &f2fs_special_inode_operations;
 755         } else {
 756                 inode->i_op = &f2fs_file_inode_operations;
 757                 inode->i_fop = &f2fs_file_operations;
 758                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 759         }
 760
 761         f2fs_lock_op(sbi);
 762         err = f2fs_acquire_orphan_inode(sbi);
 763         if (err)
 764                 goto out;
 765
 766         err = f2fs_do_tmpfile(inode, dir);
 767         if (err)
 768                 goto release_out;
 769
 770         /*
 771          * add this non-linked tmpfile to orphan list, in this way we could
 772          * remove all unused data of tmpfile after abnormal power-off.
 773          */
 774         f2fs_add_orphan_inode(inode);
 775         f2fs_alloc_nid_done(sbi, inode->i_ino);
 776
 777         if (whiteout) {
 778                 f2fs_i_links_write(inode, false);
 779                 *whiteout = inode;
 780         } else {
 781                 d_tmpfile(dentry, inode);
 782         }
 783         /* link_count was changed by d_tmpfile as well. */
 784         f2fs_unlock_op(sbi);
 785         unlock_new_inode(inode);
 786
 787         f2fs_balance_fs(sbi, true);
 788         return 0;
 789
 790 release_out:
 791         f2fs_release_orphan_inode(sbi);
 792 out:
 793         f2fs_handle_failed_inode(inode);
 794         return err;
 795 }
 796
 797 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 798 {
 799         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 800
 801         if (unlikely(f2fs_cp_error(sbi)))
 802                 return -EIO;
 803
 804         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 805                 int err = fscrypt_get_encryption_info(dir);
 806                 if (err)
 807                         return err;
 808         }
 809
 810         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 811 }
 812
 813 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 814 {
 815         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 816                 return -EIO;
 817
 818         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 819 }
 820
 821 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 822                         struct inode *new_dir, struct dentry *new_dentry,
 823                         unsigned int flags)
 824 {
 825         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 826         struct inode *old_inode = d_inode(old_dentry);
 827         struct inode *new_inode = d_inode(new_dentry);
 828         struct inode *whiteout = NULL;
 829         struct page *old_dir_page;
 830         struct page *old_page, *new_page = NULL;
 831         struct f2fs_dir_entry *old_dir_entry = NULL;
 832         struct f2fs_dir_entry *old_entry;
 833         struct f2fs_dir_entry *new_entry;
 834         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 835         int err;
 836
 837         if (unlikely(f2fs_cp_error(sbi)))
 838                 return -EIO;
 839         err = f2fs_is_checkpoint_ready(sbi);
 840         if (err)
 841                 return err;
 842
 843         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 844                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 845                         F2FS_I(old_dentry->d_inode)->i_projid)))
 846                 return -EXDEV;
 847
 848         err = dquot_initialize(old_dir);
 849         if (err)
 850                 goto out;
 851
 852         err = dquot_initialize(new_dir);
 853         if (err)
 854                 goto out;
 855
 856         if (new_inode) {
 857                 err = dquot_initialize(new_inode);
 858                 if (err)
 859                         goto out;
 860         }
 861
 862         err = -ENOENT;
 863         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 864         if (!old_entry) {
 865                 if (IS_ERR(old_page))
 866                         err = PTR_ERR(old_page);
 867                 goto out;
 868         }
 869
 870         if (S_ISDIR(old_inode->i_mode)) {
 871                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 872                 if (!old_dir_entry) {
 873                         if (IS_ERR(old_dir_page))
 874                                 err = PTR_ERR(old_dir_page);
 875                         goto out_old;
 876                 }
 877         }
 878
 879         if (flags & RENAME_WHITEOUT) {
 880                 err = f2fs_create_whiteout(old_dir, &whiteout);
 881                 if (err)
 882                         goto out_dir;
 883         }
 884
 885         if (new_inode) {
 886
 887                 err = -ENOTEMPTY;
 888                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 889                         goto out_whiteout;
 890
 891                 err = -ENOENT;
 892                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 893                                                 &new_page);
 894                 if (!new_entry) {
 895                         if (IS_ERR(new_page))
 896                                 err = PTR_ERR(new_page);
 897                         goto out_whiteout;
 898                 }
 899
 900                 f2fs_balance_fs(sbi, true);
 901
 902                 f2fs_lock_op(sbi);
 903
 904                 err = f2fs_acquire_orphan_inode(sbi);
 905                 if (err)
 906                         goto put_out_dir;
 907
 908                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 909
 910                 new_inode->i_ctime = current_time(new_inode);
 911                 down_write(&F2FS_I(new_inode)->i_sem);
 912                 if (old_dir_entry)
 913                         f2fs_i_links_write(new_inode, false);
 914                 f2fs_i_links_write(new_inode, false);
 915                 up_write(&F2FS_I(new_inode)->i_sem);
 916
 917                 if (!new_inode->i_nlink)
 918                         f2fs_add_orphan_inode(new_inode);
 919                 else
 920                         f2fs_release_orphan_inode(sbi);
 921         } else {
 922                 f2fs_balance_fs(sbi, true);
 923
 924                 f2fs_lock_op(sbi);
 925
 926                 err = f2fs_add_link(new_dentry, old_inode);
 927                 if (err) {
 928                         f2fs_unlock_op(sbi);
 929                         goto out_whiteout;
 930                 }
 931
 932                 if (old_dir_entry)
 933                         f2fs_i_links_write(new_dir, true);
 934
 935                 /*
 936                  * old entry and new entry can locate in the same inline
 937                  * dentry in inode, when attaching new entry in inline dentry,
 938                  * it could force inline dentry conversion, after that,
 939                  * old_entry and old_page will point to wrong address, in
 940                  * order to avoid this, let's do the check and update here.
 941                  */
 942                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 943                         f2fs_put_page(old_page, 0);
 944                         old_page = NULL;
 945
 946                         old_entry = f2fs_find_entry(old_dir,
 947                                                 &old_dentry->d_name, &old_page);
 948                         if (!old_entry) {
 949                                 err = -ENOENT;
 950                                 if (IS_ERR(old_page))
 951                                         err = PTR_ERR(old_page);
 952                                 f2fs_unlock_op(sbi);
 953                                 goto out_whiteout;
 954                         }
 955                 }
 956         }
 957
 958         down_write(&F2FS_I(old_inode)->i_sem);
 959         if (!old_dir_entry || whiteout)
 960                 file_lost_pino(old_inode);
 961         else
 962                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 963         up_write(&F2FS_I(old_inode)->i_sem);
 964
 965         old_inode->i_ctime = current_time(old_inode);
 966         f2fs_mark_inode_dirty_sync(old_inode, false);
 967
 968         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 969
 970         if (whiteout) {
 971                 whiteout->i_state |= I_LINKABLE;
 972                 set_inode_flag(whiteout, FI_INC_LINK);
 973                 err = f2fs_add_link(old_dentry, whiteout);
 974                 if (err)
 975                         goto put_out_dir;
 976                 whiteout->i_state &= ~I_LINKABLE;
 977                 iput(whiteout);
 978         }
 979
 980         if (old_dir_entry) {
 981                 if (old_dir != new_dir && !whiteout)
 982                         f2fs_set_link(old_inode, old_dir_entry,
 983                                                 old_dir_page, new_dir);
 984                 else
 985                         f2fs_put_page(old_dir_page, 0);
 986                 f2fs_i_links_write(old_dir, false);
 987         }
 988         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 989                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 990                 if (S_ISDIR(old_inode->i_mode))
 991                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
 992                                                         TRANS_DIR_INO);
 993         }
 994
 995         f2fs_unlock_op(sbi);
 996
 997         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 998                 f2fs_sync_fs(sbi->sb, 1);
 999
1000         f2fs_update_time(sbi, REQ_TIME);
1001         return 0;
1002
1003 put_out_dir:
1004         f2fs_unlock_op(sbi);
1005         if (new_page)
1006                 f2fs_put_page(new_page, 0);
1007 out_whiteout:
1008         if (whiteout)
1009                 iput(whiteout);
1010 out_dir:
1011         if (old_dir_entry)
1012                 f2fs_put_page(old_dir_page, 0);
1013 out_old:
1014         f2fs_put_page(old_page, 0);
1015 out:
1016         return err;
1017 }
1018
1019 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1020                              struct inode *new_dir, struct dentry *new_dentry)
1021 {
1022         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1023         struct inode *old_inode = d_inode(old_dentry);
1024         struct inode *new_inode = d_inode(new_dentry);
1025         struct page *old_dir_page, *new_dir_page;
1026         struct page *old_page, *new_page;
1027         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1028         struct f2fs_dir_entry *old_entry, *new_entry;
1029         int old_nlink = 0, new_nlink = 0;
1030         int err;
1031
1032         if (unlikely(f2fs_cp_error(sbi)))
1033                 return -EIO;
1034         err = f2fs_is_checkpoint_ready(sbi);
1035         if (err)
1036                 return err;
1037
1038         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1039                         !projid_eq(F2FS_I(new_dir)->i_projid,
1040                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1041             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1042                         !projid_eq(F2FS_I(old_dir)->i_projid,
1043                         F2FS_I(new_dentry->d_inode)->i_projid)))
1044                 return -EXDEV;
1045
1046         err = dquot_initialize(old_dir);
1047         if (err)
1048                 goto out;
1049
1050         err = dquot_initialize(new_dir);
1051         if (err)
1052                 goto out;
1053
1054         err = -ENOENT;
1055         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1056         if (!old_entry) {
1057                 if (IS_ERR(old_page))
1058                         err = PTR_ERR(old_page);
1059                 goto out;
1060         }
1061
1062         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1063         if (!new_entry) {
1064                 if (IS_ERR(new_page))
1065                         err = PTR_ERR(new_page);
1066                 goto out_old;
1067         }
1068
1069         /* prepare for updating ".." directory entry info later */
1070         if (old_dir != new_dir) {
1071                 if (S_ISDIR(old_inode->i_mode)) {
1072                         old_dir_entry = f2fs_parent_dir(old_inode,
1073                                                         &old_dir_page);
1074                         if (!old_dir_entry) {
1075                                 if (IS_ERR(old_dir_page))
1076                                         err = PTR_ERR(old_dir_page);
1077                                 goto out_new;
1078                         }
1079                 }
1080
1081                 if (S_ISDIR(new_inode->i_mode)) {
1082                         new_dir_entry = f2fs_parent_dir(new_inode,
1083                                                         &new_dir_page);
1084                         if (!new_dir_entry) {
1085                                 if (IS_ERR(new_dir_page))
1086                                         err = PTR_ERR(new_dir_page);
1087                                 goto out_old_dir;
1088                         }
1089                 }
1090         }
1091
1092         /*
1093          * If cross rename between file and directory those are not
1094          * in the same directory, we will inc nlink of file's parent
1095          * later, so we should check upper boundary of its nlink.
1096          */
1097         if ((!old_dir_entry || !new_dir_entry) &&
1098                                 old_dir_entry != new_dir_entry) {
1099                 old_nlink = old_dir_entry ? -1 : 1;
1100                 new_nlink = -old_nlink;
1101                 err = -EMLINK;
1102                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1103                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1104                         goto out_new_dir;
1105         }
1106
1107         f2fs_balance_fs(sbi, true);
1108
1109         f2fs_lock_op(sbi);
1110
1111         /* update ".." directory entry info of old dentry */
1112         if (old_dir_entry)
1113                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1114
1115         /* update ".." directory entry info of new dentry */
1116         if (new_dir_entry)
1117                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1118
1119         /* update directory entry info of old dir inode */
1120         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1121
1122         down_write(&F2FS_I(old_inode)->i_sem);
1123         file_lost_pino(old_inode);
1124         up_write(&F2FS_I(old_inode)->i_sem);
1125
1126         old_dir->i_ctime = current_time(old_dir);
1127         if (old_nlink) {
1128                 down_write(&F2FS_I(old_dir)->i_sem);
1129                 f2fs_i_links_write(old_dir, old_nlink > 0);
1130                 up_write(&F2FS_I(old_dir)->i_sem);
1131         }
1132         f2fs_mark_inode_dirty_sync(old_dir, false);
1133
1134         /* update directory entry info of new dir inode */
1135         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1136
1137         down_write(&F2FS_I(new_inode)->i_sem);
1138         file_lost_pino(new_inode);
1139         up_write(&F2FS_I(new_inode)->i_sem);
1140
1141         new_dir->i_ctime = current_time(new_dir);
1142         if (new_nlink) {
1143                 down_write(&F2FS_I(new_dir)->i_sem);
1144                 f2fs_i_links_write(new_dir, new_nlink > 0);
1145                 up_write(&F2FS_I(new_dir)->i_sem);
1146         }
1147         f2fs_mark_inode_dirty_sync(new_dir, false);
1148
1149         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1150                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1151                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1152         }
1153
1154         f2fs_unlock_op(sbi);
1155
1156         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1157                 f2fs_sync_fs(sbi->sb, 1);
1158
1159         f2fs_update_time(sbi, REQ_TIME);
1160         return 0;
1161 out_new_dir:
1162         if (new_dir_entry) {
1163                 f2fs_put_page(new_dir_page, 0);
1164         }
1165 out_old_dir:
1166         if (old_dir_entry) {
1167                 f2fs_put_page(old_dir_page, 0);
1168         }
1169 out_new:
1170         f2fs_put_page(new_page, 0);
1171 out_old:
1172         f2fs_put_page(old_page, 0);
1173 out:
1174         return err;
1175 }
1176
1177 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1178                         struct inode *new_dir, struct dentry *new_dentry,
1179                         unsigned int flags)
1180 {
1181         int err;
1182
1183         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1184                 return -EINVAL;
1185
1186         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1187                                      flags);
1188         if (err)
1189                 return err;
1190
1191         if (flags & RENAME_EXCHANGE) {
1192                 return f2fs_cross_rename(old_dir, old_dentry,
1193                                          new_dir, new_dentry);
1194         }
1195         /*
1196          * VFS has already handled the new dentry existence case,
1197          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1198          */
1199         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1200 }
1201
1202 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1203 {
1204         struct inode *inode = d_inode(dentry);
1205         struct page *page;
1206         void *target;
1207
1208         if (!dentry)
1209                 return ERR_PTR(-ECHILD);
1210
1211         page = read_mapping_page(inode->i_mapping, 0, NULL);
1212         if (IS_ERR(page))
1213                 return ERR_CAST(page);
1214
1215         target = fscrypt_get_symlink(inode, page_address(page),
1216                                      inode->i_sb->s_blocksize);
1217         put_page(page);
1218         return *cookie = target;
1219 }
1220
1221 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1222         .readlink       = generic_readlink,
1223         .follow_link    = f2fs_encrypted_follow_link,
1224         .put_link       = kfree_put_link,
1225         .getattr        = f2fs_getattr,
1226         .setattr        = f2fs_setattr,
1227 #ifdef CONFIG_F2FS_FS_XATTR
1228         .setxattr       = generic_setxattr,
1229         .getxattr       = generic_getxattr,
1230         .listxattr      = f2fs_listxattr,
1231         .removexattr    = generic_removexattr,
1232 #endif
1233 };
1234
1235 const struct inode_operations f2fs_dir_inode_operations = {
1236         .create         = f2fs_create,
1237         .lookup         = f2fs_lookup,
1238         .link           = f2fs_link,
1239         .unlink         = f2fs_unlink,
1240         .symlink        = f2fs_symlink,
1241         .mkdir          = f2fs_mkdir,
1242         .rmdir          = f2fs_rmdir,
1243         .mknod          = f2fs_mknod,
1244         .rename2        = f2fs_rename2,
1245         .tmpfile        = f2fs_tmpfile,
1246         .getattr        = f2fs_getattr,
1247         .setattr        = f2fs_setattr,
1248         .get_acl        = f2fs_get_acl,
1249         .set_acl        = f2fs_set_acl,
1250 #ifdef CONFIG_F2FS_FS_XATTR
1251         .setxattr       = generic_setxattr,
1252         .getxattr       = generic_getxattr,
1253         .listxattr      = f2fs_listxattr,
1254         .removexattr    = generic_removexattr,
1255 #endif
1256 };
1257
1258 const struct inode_operations f2fs_symlink_inode_operations = {
1259         .readlink       = generic_readlink,
1260         .follow_link    = f2fs_follow_link,
1261         .put_link       = page_put_link,
1262         .getattr        = f2fs_getattr,
1263         .setattr        = f2fs_setattr,
1264 #ifdef CONFIG_F2FS_FS_XATTR
1265         .setxattr       = generic_setxattr,
1266         .getxattr       = generic_getxattr,
1267         .listxattr      = f2fs_listxattr,
1268         .removexattr    = generic_removexattr,
1269 #endif
1270 };
1271
1272 const struct inode_operations f2fs_special_inode_operations = {
1273         .getattr        = f2fs_getattr,
1274         .setattr        = f2fs_setattr,
1275         .get_acl        = f2fs_get_acl,
1276         .set_acl        = f2fs_set_acl,
1277 #ifdef CONFIG_F2FS_FS_XATTR
1278         .setxattr       = generic_setxattr,
1279         .getxattr       = generic_getxattr,
1280         .listxattr      = f2fs_listxattr,
1281         .removexattr    = generic_removexattr,
1282 #endif
1283 };