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 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(dentry, inode);
 304         unlock_new_inode(inode);
 305
 306         if (IS_DIRSYNC(dir))
 307                 f2fs_sync_fs(sbi->sb, 1);
 308
 309         f2fs_balance_fs(sbi, true);
 310         return 0;
 311 out:
 312         f2fs_handle_failed_inode(inode);
 313         return err;
 314 }
 315
 316 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 317                 struct dentry *dentry)
 318 {
 319         struct inode *inode = d_inode(old_dentry);
 320         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 321         int err;
 322
 323         if (unlikely(f2fs_cp_error(sbi)))
 324                 return -EIO;
 325         err = f2fs_is_checkpoint_ready(sbi);
 326         if (err)
 327                 return err;
 328
 329         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 330         if (err)
 331                 return err;
 332
 333         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 334                         (!projid_eq(F2FS_I(dir)->i_projid,
 335                         F2FS_I(old_dentry->d_inode)->i_projid)))
 336                 return -EXDEV;
 337
 338         err = dquot_initialize(dir);
 339         if (err)
 340                 return err;
 341
 342         f2fs_balance_fs(sbi, true);
 343
 344         inode->i_ctime = current_time(inode);
 345         ihold(inode);
 346
 347         set_inode_flag(inode, FI_INC_LINK);
 348         f2fs_lock_op(sbi);
 349         err = f2fs_add_link(dentry, inode);
 350         if (err)
 351                 goto out;
 352         f2fs_unlock_op(sbi);
 353
 354         d_instantiate(dentry, inode);
 355
 356         if (IS_DIRSYNC(dir))
 357                 f2fs_sync_fs(sbi->sb, 1);
 358         return 0;
 359 out:
 360         clear_inode_flag(inode, FI_INC_LINK);
 361         iput(inode);
 362         f2fs_unlock_op(sbi);
 363         return err;
 364 }
 365
 366 struct dentry *f2fs_get_parent(struct dentry *child)
 367 {
 368         struct qstr dotdot = QSTR_INIT("..", 2);
 369         struct page *page;
 370         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 371         if (!ino) {
 372                 if (IS_ERR(page))
 373                         return ERR_CAST(page);
 374                 return ERR_PTR(-ENOENT);
 375         }
 376         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 377 }
 378
 379 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 380 {
 381         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 382         struct qstr dot = QSTR_INIT(".", 1);
 383         struct qstr dotdot = QSTR_INIT("..", 2);
 384         struct f2fs_dir_entry *de;
 385         struct page *page;
 386         int err = 0;
 387
 388         if (f2fs_readonly(sbi->sb)) {
 389                 f2fs_msg(sbi->sb, KERN_INFO,
 390                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 391                         "in readonly mountpoint", dir->i_ino, pino);
 392                 return 0;
 393         }
 394
 395         err = dquot_initialize(dir);
 396         if (err)
 397                 return err;
 398
 399         f2fs_balance_fs(sbi, true);
 400
 401         f2fs_lock_op(sbi);
 402
 403         de = f2fs_find_entry(dir, &dot, &page);
 404         if (de) {
 405                 f2fs_put_page(page, 0);
 406         } else if (IS_ERR(page)) {
 407                 err = PTR_ERR(page);
 408                 goto out;
 409         } else {
 410                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 411                 if (err)
 412                         goto out;
 413         }
 414
 415         de = f2fs_find_entry(dir, &dotdot, &page);
 416         if (de)
 417                 f2fs_put_page(page, 0);
 418         else if (IS_ERR(page))
 419                 err = PTR_ERR(page);
 420         else
 421                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 422 out:
 423         if (!err)
 424                 clear_inode_flag(dir, FI_INLINE_DOTS);
 425
 426         f2fs_unlock_op(sbi);
 427         return err;
 428 }
 429
 430 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 431                 unsigned int flags)
 432 {
 433         struct inode *inode = NULL;
 434         struct f2fs_dir_entry *de;
 435         struct page *page;
 436         struct dentry *new;
 437         nid_t ino = -1;
 438         int err = 0;
 439         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 440
 441         trace_f2fs_lookup_start(dir, dentry, flags);
 442
 443         err = fscrypt_prepare_lookup(dir, dentry, flags);
 444         if (err)
 445                 goto out;
 446
 447         if (dentry->d_name.len > F2FS_NAME_LEN) {
 448                 err = -ENAMETOOLONG;
 449                 goto out;
 450         }
 451
 452         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 453         if (!de) {
 454                 if (IS_ERR(page)) {
 455                         err = PTR_ERR(page);
 456                         goto out;
 457                 }
 458                 goto out_splice;
 459         }
 460
 461         ino = le32_to_cpu(de->ino);
 462         f2fs_put_page(page, 0);
 463
 464         inode = f2fs_iget(dir->i_sb, ino);
 465         if (IS_ERR(inode)) {
 466                 err = PTR_ERR(inode);
 467                 goto out;
 468         }
 469
 470         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 471                 err = __recover_dot_dentries(dir, root_ino);
 472                 if (err)
 473                         goto out_iput;
 474         }
 475
 476         if (f2fs_has_inline_dots(inode)) {
 477                 err = __recover_dot_dentries(inode, dir->i_ino);
 478                 if (err)
 479                         goto out_iput;
 480         }
 481         if (f2fs_encrypted_inode(dir) &&
 482             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 483             !fscrypt_has_permitted_context(dir, inode)) {
 484                 f2fs_msg(inode->i_sb, KERN_WARNING,
 485                          "Inconsistent encryption contexts: %lu/%lu",
 486                          dir->i_ino, inode->i_ino);
 487                 err = -EPERM;
 488                 goto out_iput;
 489         }
 490 out_splice:
 491         new = d_splice_alias(inode, dentry);
 492         if (IS_ERR(new))
 493                 err = PTR_ERR(new);
 494         trace_f2fs_lookup_end(dir, dentry, ino, err);
 495         return new;
 496 out_iput:
 497         iput(inode);
 498 out:
 499         trace_f2fs_lookup_end(dir, dentry, ino, err);
 500         return ERR_PTR(err);
 501 }
 502
 503 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 504 {
 505         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 506         struct inode *inode = d_inode(dentry);
 507         struct f2fs_dir_entry *de;
 508         struct page *page;
 509         int err = -ENOENT;
 510
 511         trace_f2fs_unlink_enter(dir, dentry);
 512
 513         if (unlikely(f2fs_cp_error(sbi)))
 514                 return -EIO;
 515
 516         err = dquot_initialize(dir);
 517         if (err)
 518                 return err;
 519         err = dquot_initialize(inode);
 520         if (err)
 521                 return err;
 522
 523         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 524         if (!de) {
 525                 if (IS_ERR(page))
 526                         err = PTR_ERR(page);
 527                 goto fail;
 528         }
 529
 530         f2fs_balance_fs(sbi, true);
 531
 532         f2fs_lock_op(sbi);
 533         err = f2fs_acquire_orphan_inode(sbi);
 534         if (err) {
 535                 f2fs_unlock_op(sbi);
 536                 f2fs_put_page(page, 0);
 537                 goto fail;
 538         }
 539         f2fs_delete_entry(de, page, dir, inode);
 540         f2fs_unlock_op(sbi);
 541
 542         if (IS_DIRSYNC(dir))
 543                 f2fs_sync_fs(sbi->sb, 1);
 544 fail:
 545         trace_f2fs_unlink_exit(inode, err);
 546         return err;
 547 }
 548
 549 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
 550 {
 551         const char *link = page_follow_link_light(dentry, cookie);
 552         if (!IS_ERR(link) && !*link) {
 553                 /* this is broken symlink case */
 554                 page_put_link(NULL, *cookie);
 555                 link = ERR_PTR(-ENOENT);
 556         }
 557         return link;
 558 }
 559
 560 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 561                                         const char *symname)
 562 {
 563         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 564         struct inode *inode;
 565         size_t len = strlen(symname);
 566         struct fscrypt_str disk_link;
 567         int err;
 568
 569         if (unlikely(f2fs_cp_error(sbi)))
 570                 return -EIO;
 571         err = f2fs_is_checkpoint_ready(sbi);
 572         if (err)
 573                 return err;
 574
 575         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 576                                       &disk_link);
 577         if (err)
 578                 return err;
 579
 580         err = dquot_initialize(dir);
 581         if (err)
 582                 return err;
 583
 584         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 585         if (IS_ERR(inode))
 586                 return PTR_ERR(inode);
 587
 588         if (IS_ENCRYPTED(inode))
 589                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 590         else
 591                 inode->i_op = &f2fs_symlink_inode_operations;
 592         inode_nohighmem(inode);
 593         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 594
 595         f2fs_lock_op(sbi);
 596         err = f2fs_add_link(dentry, inode);
 597         if (err)
 598                 goto out_f2fs_handle_failed_inode;
 599         f2fs_unlock_op(sbi);
 600         f2fs_alloc_nid_done(sbi, inode->i_ino);
 601
 602         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 603         if (err)
 604                 goto err_out;
 605
 606         err = page_symlink(inode, disk_link.name, disk_link.len);
 607
 608 err_out:
 609         d_instantiate(dentry, inode);
 610         unlock_new_inode(inode);
 611
 612         /*
 613          * Let's flush symlink data in order to avoid broken symlink as much as
 614          * possible. Nevertheless, fsyncing is the best way, but there is no
 615          * way to get a file descriptor in order to flush that.
 616          *
 617          * Note that, it needs to do dir->fsync to make this recoverable.
 618          * If the symlink path is stored into inline_data, there is no
 619          * performance regression.
 620          */
 621         if (!err) {
 622                 filemap_write_and_wait_range(inode->i_mapping, 0,
 623                                                         disk_link.len - 1);
 624
 625                 if (IS_DIRSYNC(dir))
 626                         f2fs_sync_fs(sbi->sb, 1);
 627         } else {
 628                 f2fs_unlink(dir, dentry);
 629         }
 630
 631         f2fs_balance_fs(sbi, true);
 632         goto out_free_encrypted_link;
 633
 634 out_f2fs_handle_failed_inode:
 635         f2fs_handle_failed_inode(inode);
 636 out_free_encrypted_link:
 637         if (disk_link.name != (unsigned char *)symname)
 638                 kvfree(disk_link.name);
 639         return err;
 640 }
 641
 642 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 643 {
 644         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 645         struct inode *inode;
 646         int err;
 647
 648         if (unlikely(f2fs_cp_error(sbi)))
 649                 return -EIO;
 650
 651         err = dquot_initialize(dir);
 652         if (err)
 653                 return err;
 654
 655         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 656         if (IS_ERR(inode))
 657                 return PTR_ERR(inode);
 658
 659         inode->i_op = &f2fs_dir_inode_operations;
 660         inode->i_fop = &f2fs_dir_operations;
 661         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 662         inode_nohighmem(inode);
 663
 664         set_inode_flag(inode, FI_INC_LINK);
 665         f2fs_lock_op(sbi);
 666         err = f2fs_add_link(dentry, inode);
 667         if (err)
 668                 goto out_fail;
 669         f2fs_unlock_op(sbi);
 670
 671         f2fs_alloc_nid_done(sbi, inode->i_ino);
 672
 673         d_instantiate(dentry, inode);
 674         unlock_new_inode(inode);
 675
 676         if (IS_DIRSYNC(dir))
 677                 f2fs_sync_fs(sbi->sb, 1);
 678
 679         f2fs_balance_fs(sbi, true);
 680         return 0;
 681
 682 out_fail:
 683         clear_inode_flag(inode, FI_INC_LINK);
 684         f2fs_handle_failed_inode(inode);
 685         return err;
 686 }
 687
 688 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 689 {
 690         struct inode *inode = d_inode(dentry);
 691         if (f2fs_empty_dir(inode))
 692                 return f2fs_unlink(dir, dentry);
 693         return -ENOTEMPTY;
 694 }
 695
 696 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 697                                 umode_t mode, dev_t rdev)
 698 {
 699         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 700         struct inode *inode;
 701         int err = 0;
 702
 703         if (unlikely(f2fs_cp_error(sbi)))
 704                 return -EIO;
 705         err = f2fs_is_checkpoint_ready(sbi);
 706         if (err)
 707                 return err;
 708
 709         err = dquot_initialize(dir);
 710         if (err)
 711                 return err;
 712
 713         inode = f2fs_new_inode(dir, mode);
 714         if (IS_ERR(inode))
 715                 return PTR_ERR(inode);
 716
 717         init_special_inode(inode, inode->i_mode, rdev);
 718         inode->i_op = &f2fs_special_inode_operations;
 719
 720         f2fs_lock_op(sbi);
 721         err = f2fs_add_link(dentry, inode);
 722         if (err)
 723                 goto out;
 724         f2fs_unlock_op(sbi);
 725
 726         f2fs_alloc_nid_done(sbi, inode->i_ino);
 727
 728         d_instantiate(dentry, inode);
 729         unlock_new_inode(inode);
 730
 731         if (IS_DIRSYNC(dir))
 732                 f2fs_sync_fs(sbi->sb, 1);
 733
 734         f2fs_balance_fs(sbi, true);
 735         return 0;
 736 out:
 737         f2fs_handle_failed_inode(inode);
 738         return err;
 739 }
 740
 741 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 742                                         umode_t mode, struct inode **whiteout)
 743 {
 744         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 745         struct inode *inode;
 746         int err;
 747
 748         err = dquot_initialize(dir);
 749         if (err)
 750                 return err;
 751
 752         inode = f2fs_new_inode(dir, mode);
 753         if (IS_ERR(inode))
 754                 return PTR_ERR(inode);
 755
 756         if (whiteout) {
 757                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 758                 inode->i_op = &f2fs_special_inode_operations;
 759         } else {
 760                 inode->i_op = &f2fs_file_inode_operations;
 761                 inode->i_fop = &f2fs_file_operations;
 762                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 763         }
 764
 765         f2fs_lock_op(sbi);
 766         err = f2fs_acquire_orphan_inode(sbi);
 767         if (err)
 768                 goto out;
 769
 770         err = f2fs_do_tmpfile(inode, dir);
 771         if (err)
 772                 goto release_out;
 773
 774         /*
 775          * add this non-linked tmpfile to orphan list, in this way we could
 776          * remove all unused data of tmpfile after abnormal power-off.
 777          */
 778         f2fs_add_orphan_inode(inode);
 779         f2fs_alloc_nid_done(sbi, inode->i_ino);
 780
 781         if (whiteout) {
 782                 f2fs_i_links_write(inode, false);
 783                 *whiteout = inode;
 784         } else {
 785                 d_tmpfile(dentry, inode);
 786         }
 787         /* link_count was changed by d_tmpfile as well. */
 788         f2fs_unlock_op(sbi);
 789         unlock_new_inode(inode);
 790
 791         f2fs_balance_fs(sbi, true);
 792         return 0;
 793
 794 release_out:
 795         f2fs_release_orphan_inode(sbi);
 796 out:
 797         f2fs_handle_failed_inode(inode);
 798         return err;
 799 }
 800
 801 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 802 {
 803         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 804
 805         if (unlikely(f2fs_cp_error(sbi)))
 806                 return -EIO;
 807
 808         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 809                 int err = fscrypt_get_encryption_info(dir);
 810                 if (err)
 811                         return err;
 812         }
 813
 814         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 815 }
 816
 817 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 818 {
 819         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 820                 return -EIO;
 821
 822         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 823 }
 824
 825 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 826                         struct inode *new_dir, struct dentry *new_dentry,
 827                         unsigned int flags)
 828 {
 829         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 830         struct inode *old_inode = d_inode(old_dentry);
 831         struct inode *new_inode = d_inode(new_dentry);
 832         struct inode *whiteout = NULL;
 833         struct page *old_dir_page;
 834         struct page *old_page, *new_page = NULL;
 835         struct f2fs_dir_entry *old_dir_entry = NULL;
 836         struct f2fs_dir_entry *old_entry;
 837         struct f2fs_dir_entry *new_entry;
 838         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 839         int err;
 840
 841         if (unlikely(f2fs_cp_error(sbi)))
 842                 return -EIO;
 843         err = f2fs_is_checkpoint_ready(sbi);
 844         if (err)
 845                 return err;
 846
 847         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 848                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 849                         F2FS_I(old_dentry->d_inode)->i_projid)))
 850                 return -EXDEV;
 851
 852         err = dquot_initialize(old_dir);
 853         if (err)
 854                 goto out;
 855
 856         err = dquot_initialize(new_dir);
 857         if (err)
 858                 goto out;
 859
 860         if (new_inode) {
 861                 err = dquot_initialize(new_inode);
 862                 if (err)
 863                         goto out;
 864         }
 865
 866         err = -ENOENT;
 867         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 868         if (!old_entry) {
 869                 if (IS_ERR(old_page))
 870                         err = PTR_ERR(old_page);
 871                 goto out;
 872         }
 873
 874         if (S_ISDIR(old_inode->i_mode)) {
 875                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 876                 if (!old_dir_entry) {
 877                         if (IS_ERR(old_dir_page))
 878                                 err = PTR_ERR(old_dir_page);
 879                         goto out_old;
 880                 }
 881         }
 882
 883         if (flags & RENAME_WHITEOUT) {
 884                 err = f2fs_create_whiteout(old_dir, &whiteout);
 885                 if (err)
 886                         goto out_dir;
 887         }
 888
 889         if (new_inode) {
 890
 891                 err = -ENOTEMPTY;
 892                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 893                         goto out_whiteout;
 894
 895                 err = -ENOENT;
 896                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 897                                                 &new_page);
 898                 if (!new_entry) {
 899                         if (IS_ERR(new_page))
 900                                 err = PTR_ERR(new_page);
 901                         goto out_whiteout;
 902                 }
 903
 904                 f2fs_balance_fs(sbi, true);
 905
 906                 f2fs_lock_op(sbi);
 907
 908                 err = f2fs_acquire_orphan_inode(sbi);
 909                 if (err)
 910                         goto put_out_dir;
 911
 912                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 913
 914                 new_inode->i_ctime = current_time(new_inode);
 915                 down_write(&F2FS_I(new_inode)->i_sem);
 916                 if (old_dir_entry)
 917                         f2fs_i_links_write(new_inode, false);
 918                 f2fs_i_links_write(new_inode, false);
 919                 up_write(&F2FS_I(new_inode)->i_sem);
 920
 921                 if (!new_inode->i_nlink)
 922                         f2fs_add_orphan_inode(new_inode);
 923                 else
 924                         f2fs_release_orphan_inode(sbi);
 925         } else {
 926                 f2fs_balance_fs(sbi, true);
 927
 928                 f2fs_lock_op(sbi);
 929
 930                 err = f2fs_add_link(new_dentry, old_inode);
 931                 if (err) {
 932                         f2fs_unlock_op(sbi);
 933                         goto out_whiteout;
 934                 }
 935
 936                 if (old_dir_entry)
 937                         f2fs_i_links_write(new_dir, true);
 938
 939                 /*
 940                  * old entry and new entry can locate in the same inline
 941                  * dentry in inode, when attaching new entry in inline dentry,
 942                  * it could force inline dentry conversion, after that,
 943                  * old_entry and old_page will point to wrong address, in
 944                  * order to avoid this, let's do the check and update here.
 945                  */
 946                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 947                         f2fs_put_page(old_page, 0);
 948                         old_page = NULL;
 949
 950                         old_entry = f2fs_find_entry(old_dir,
 951                                                 &old_dentry->d_name, &old_page);
 952                         if (!old_entry) {
 953                                 err = -ENOENT;
 954                                 if (IS_ERR(old_page))
 955                                         err = PTR_ERR(old_page);
 956                                 f2fs_unlock_op(sbi);
 957                                 goto out_whiteout;
 958                         }
 959                 }
 960         }
 961
 962         down_write(&F2FS_I(old_inode)->i_sem);
 963         if (!old_dir_entry || whiteout)
 964                 file_lost_pino(old_inode);
 965         else
 966                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 967         up_write(&F2FS_I(old_inode)->i_sem);
 968
 969         old_inode->i_ctime = current_time(old_inode);
 970         f2fs_mark_inode_dirty_sync(old_inode, false);
 971
 972         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 973
 974         if (whiteout) {
 975                 whiteout->i_state |= I_LINKABLE;
 976                 set_inode_flag(whiteout, FI_INC_LINK);
 977                 err = f2fs_add_link(old_dentry, whiteout);
 978                 if (err)
 979                         goto put_out_dir;
 980                 whiteout->i_state &= ~I_LINKABLE;
 981                 iput(whiteout);
 982         }
 983
 984         if (old_dir_entry) {
 985                 if (old_dir != new_dir && !whiteout)
 986                         f2fs_set_link(old_inode, old_dir_entry,
 987                                                 old_dir_page, new_dir);
 988                 else
 989                         f2fs_put_page(old_dir_page, 0);
 990                 f2fs_i_links_write(old_dir, false);
 991         }
 992         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 993                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 994                 if (S_ISDIR(old_inode->i_mode))
 995                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
 996                                                         TRANS_DIR_INO);
 997         }
 998
 999         f2fs_unlock_op(sbi);
1000
1001         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1002                 f2fs_sync_fs(sbi->sb, 1);
1003
1004         f2fs_update_time(sbi, REQ_TIME);
1005         return 0;
1006
1007 put_out_dir:
1008         f2fs_unlock_op(sbi);
1009         if (new_page)
1010                 f2fs_put_page(new_page, 0);
1011 out_whiteout:
1012         if (whiteout)
1013                 iput(whiteout);
1014 out_dir:
1015         if (old_dir_entry)
1016                 f2fs_put_page(old_dir_page, 0);
1017 out_old:
1018         f2fs_put_page(old_page, 0);
1019 out:
1020         return err;
1021 }
1022
1023 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1024                              struct inode *new_dir, struct dentry *new_dentry)
1025 {
1026         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1027         struct inode *old_inode = d_inode(old_dentry);
1028         struct inode *new_inode = d_inode(new_dentry);
1029         struct page *old_dir_page, *new_dir_page;
1030         struct page *old_page, *new_page;
1031         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1032         struct f2fs_dir_entry *old_entry, *new_entry;
1033         int old_nlink = 0, new_nlink = 0;
1034         int err;
1035
1036         if (unlikely(f2fs_cp_error(sbi)))
1037                 return -EIO;
1038         err = f2fs_is_checkpoint_ready(sbi);
1039         if (err)
1040                 return err;
1041
1042         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1043                         !projid_eq(F2FS_I(new_dir)->i_projid,
1044                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1045             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1046                         !projid_eq(F2FS_I(old_dir)->i_projid,
1047                         F2FS_I(new_dentry->d_inode)->i_projid)))
1048                 return -EXDEV;
1049
1050         err = dquot_initialize(old_dir);
1051         if (err)
1052                 goto out;
1053
1054         err = dquot_initialize(new_dir);
1055         if (err)
1056                 goto out;
1057
1058         err = -ENOENT;
1059         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1060         if (!old_entry) {
1061                 if (IS_ERR(old_page))
1062                         err = PTR_ERR(old_page);
1063                 goto out;
1064         }
1065
1066         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1067         if (!new_entry) {
1068                 if (IS_ERR(new_page))
1069                         err = PTR_ERR(new_page);
1070                 goto out_old;
1071         }
1072
1073         /* prepare for updating ".." directory entry info later */
1074         if (old_dir != new_dir) {
1075                 if (S_ISDIR(old_inode->i_mode)) {
1076                         old_dir_entry = f2fs_parent_dir(old_inode,
1077                                                         &old_dir_page);
1078                         if (!old_dir_entry) {
1079                                 if (IS_ERR(old_dir_page))
1080                                         err = PTR_ERR(old_dir_page);
1081                                 goto out_new;
1082                         }
1083                 }
1084
1085                 if (S_ISDIR(new_inode->i_mode)) {
1086                         new_dir_entry = f2fs_parent_dir(new_inode,
1087                                                         &new_dir_page);
1088                         if (!new_dir_entry) {
1089                                 if (IS_ERR(new_dir_page))
1090                                         err = PTR_ERR(new_dir_page);
1091                                 goto out_old_dir;
1092                         }
1093                 }
1094         }
1095
1096         /*
1097          * If cross rename between file and directory those are not
1098          * in the same directory, we will inc nlink of file's parent
1099          * later, so we should check upper boundary of its nlink.
1100          */
1101         if ((!old_dir_entry || !new_dir_entry) &&
1102                                 old_dir_entry != new_dir_entry) {
1103                 old_nlink = old_dir_entry ? -1 : 1;
1104                 new_nlink = -old_nlink;
1105                 err = -EMLINK;
1106                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1107                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1108                         goto out_new_dir;
1109         }
1110
1111         f2fs_balance_fs(sbi, true);
1112
1113         f2fs_lock_op(sbi);
1114
1115         /* update ".." directory entry info of old dentry */
1116         if (old_dir_entry)
1117                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1118
1119         /* update ".." directory entry info of new dentry */
1120         if (new_dir_entry)
1121                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1122
1123         /* update directory entry info of old dir inode */
1124         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1125
1126         down_write(&F2FS_I(old_inode)->i_sem);
1127         file_lost_pino(old_inode);
1128         up_write(&F2FS_I(old_inode)->i_sem);
1129
1130         old_dir->i_ctime = current_time(old_dir);
1131         if (old_nlink) {
1132                 down_write(&F2FS_I(old_dir)->i_sem);
1133                 f2fs_i_links_write(old_dir, old_nlink > 0);
1134                 up_write(&F2FS_I(old_dir)->i_sem);
1135         }
1136         f2fs_mark_inode_dirty_sync(old_dir, false);
1137
1138         /* update directory entry info of new dir inode */
1139         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1140
1141         down_write(&F2FS_I(new_inode)->i_sem);
1142         file_lost_pino(new_inode);
1143         up_write(&F2FS_I(new_inode)->i_sem);
1144
1145         new_dir->i_ctime = current_time(new_dir);
1146         if (new_nlink) {
1147                 down_write(&F2FS_I(new_dir)->i_sem);
1148                 f2fs_i_links_write(new_dir, new_nlink > 0);
1149                 up_write(&F2FS_I(new_dir)->i_sem);
1150         }
1151         f2fs_mark_inode_dirty_sync(new_dir, false);
1152
1153         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1154                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1155                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1156         }
1157
1158         f2fs_unlock_op(sbi);
1159
1160         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1161                 f2fs_sync_fs(sbi->sb, 1);
1162
1163         f2fs_update_time(sbi, REQ_TIME);
1164         return 0;
1165 out_new_dir:
1166         if (new_dir_entry) {
1167                 f2fs_put_page(new_dir_page, 0);
1168         }
1169 out_old_dir:
1170         if (old_dir_entry) {
1171                 f2fs_put_page(old_dir_page, 0);
1172         }
1173 out_new:
1174         f2fs_put_page(new_page, 0);
1175 out_old:
1176         f2fs_put_page(old_page, 0);
1177 out:
1178         return err;
1179 }
1180
1181 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1182                         struct inode *new_dir, struct dentry *new_dentry,
1183                         unsigned int flags)
1184 {
1185         int err;
1186
1187         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1188                 return -EINVAL;
1189
1190         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1191                                      flags);
1192         if (err)
1193                 return err;
1194
1195         if (flags & RENAME_EXCHANGE) {
1196                 return f2fs_cross_rename(old_dir, old_dentry,
1197                                          new_dir, new_dentry);
1198         }
1199         /*
1200          * VFS has already handled the new dentry existence case,
1201          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1202          */
1203         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1204 }
1205
1206 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1207 {
1208         struct inode *inode = d_inode(dentry);
1209         struct page *page;
1210         void *target;
1211
1212         if (!dentry)
1213                 return ERR_PTR(-ECHILD);
1214
1215         page = read_mapping_page(inode->i_mapping, 0, NULL);
1216         if (IS_ERR(page))
1217                 return ERR_CAST(page);
1218
1219         target = fscrypt_get_symlink(inode, page_address(page),
1220                                      inode->i_sb->s_blocksize);
1221         put_page(page);
1222         return *cookie = target;
1223 }
1224
1225 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1226         .readlink       = generic_readlink,
1227         .follow_link    = f2fs_encrypted_follow_link,
1228         .put_link       = kfree_put_link,
1229         .getattr        = f2fs_getattr,
1230         .setattr        = f2fs_setattr,
1231 #ifdef CONFIG_F2FS_FS_XATTR
1232         .setxattr       = generic_setxattr,
1233         .getxattr       = generic_getxattr,
1234         .listxattr      = f2fs_listxattr,
1235         .removexattr    = generic_removexattr,
1236 #endif
1237 };
1238
1239 const struct inode_operations f2fs_dir_inode_operations = {
1240         .create         = f2fs_create,
1241         .lookup         = f2fs_lookup,
1242         .link           = f2fs_link,
1243         .unlink         = f2fs_unlink,
1244         .symlink        = f2fs_symlink,
1245         .mkdir          = f2fs_mkdir,
1246         .rmdir          = f2fs_rmdir,
1247         .mknod          = f2fs_mknod,
1248         .rename2        = f2fs_rename2,
1249         .tmpfile        = f2fs_tmpfile,
1250         .getattr        = f2fs_getattr,
1251         .setattr        = f2fs_setattr,
1252         .get_acl        = f2fs_get_acl,
1253         .set_acl        = f2fs_set_acl,
1254 #ifdef CONFIG_F2FS_FS_XATTR
1255         .setxattr       = generic_setxattr,
1256         .getxattr       = generic_getxattr,
1257         .listxattr      = f2fs_listxattr,
1258         .removexattr    = generic_removexattr,
1259 #endif
1260 };
1261
1262 const struct inode_operations f2fs_symlink_inode_operations = {
1263         .readlink       = generic_readlink,
1264         .follow_link    = f2fs_follow_link,
1265         .put_link       = page_put_link,
1266         .getattr        = f2fs_getattr,
1267         .setattr        = f2fs_setattr,
1268 #ifdef CONFIG_F2FS_FS_XATTR
1269         .setxattr       = generic_setxattr,
1270         .getxattr       = generic_getxattr,
1271         .listxattr      = f2fs_listxattr,
1272         .removexattr    = generic_removexattr,
1273 #endif
1274 };
1275
1276 const struct inode_operations f2fs_special_inode_operations = {
1277         .getattr        = f2fs_getattr,
1278         .setattr        = f2fs_setattr,
1279         .get_acl        = f2fs_get_acl,
1280         .set_acl        = f2fs_set_acl,
1281 #ifdef CONFIG_F2FS_FS_XATTR
1282         .setxattr       = generic_setxattr,
1283         .getxattr       = generic_getxattr,
1284         .listxattr      = f2fs_listxattr,
1285         .removexattr    = generic_removexattr,
1286 #endif
1287 };