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 = current_time(inode);
  53         F2FS_I(inode)->i_crtime = inode->i_mtime;
  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 ((IS_ENCRYPTED(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         if (!f2fs_is_checkpoint_ready(sbi))
 276                 return -ENOSPC;
 277
 278         err = dquot_initialize(dir);
 279         if (err)
 280                 return err;
 281
 282         inode = f2fs_new_inode(dir, mode);
 283         if (IS_ERR(inode))
 284                 return PTR_ERR(inode);
 285
 286         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 287                 set_file_temperature(sbi, inode, dentry->d_name.name);
 288
 289         inode->i_op = &f2fs_file_inode_operations;
 290         inode->i_fop = &f2fs_file_operations;
 291         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 292         ino = inode->i_ino;
 293
 294         f2fs_lock_op(sbi);
 295         err = f2fs_add_link(dentry, inode);
 296         if (err)
 297                 goto out;
 298         f2fs_unlock_op(sbi);
 299
 300         f2fs_alloc_nid_done(sbi, ino);
 301
 302         d_instantiate_new(dentry, inode);
 303
 304         if (IS_DIRSYNC(dir))
 305                 f2fs_sync_fs(sbi->sb, 1);
 306
 307         f2fs_balance_fs(sbi, true);
 308         return 0;
 309 out:
 310         f2fs_handle_failed_inode(inode);
 311         return err;
 312 }
 313
 314 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 315                 struct dentry *dentry)
 316 {
 317         struct inode *inode = d_inode(old_dentry);
 318         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 319         int err;
 320
 321         if (unlikely(f2fs_cp_error(sbi)))
 322                 return -EIO;
 323         if (!f2fs_is_checkpoint_ready(sbi))
 324                 return -ENOSPC;
 325
 326         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 327         if (err)
 328                 return err;
 329
 330         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 331                         (!projid_eq(F2FS_I(dir)->i_projid,
 332                         F2FS_I(old_dentry->d_inode)->i_projid)))
 333                 return -EXDEV;
 334
 335         err = dquot_initialize(dir);
 336         if (err)
 337                 return err;
 338
 339         f2fs_balance_fs(sbi, true);
 340
 341         inode->i_ctime = current_time(inode);
 342         ihold(inode);
 343
 344         set_inode_flag(inode, FI_INC_LINK);
 345         f2fs_lock_op(sbi);
 346         err = f2fs_add_link(dentry, inode);
 347         if (err)
 348                 goto out;
 349         f2fs_unlock_op(sbi);
 350
 351         d_instantiate(dentry, inode);
 352
 353         if (IS_DIRSYNC(dir))
 354                 f2fs_sync_fs(sbi->sb, 1);
 355         return 0;
 356 out:
 357         clear_inode_flag(inode, FI_INC_LINK);
 358         iput(inode);
 359         f2fs_unlock_op(sbi);
 360         return err;
 361 }
 362
 363 struct dentry *f2fs_get_parent(struct dentry *child)
 364 {
 365         struct qstr dotdot = QSTR_INIT("..", 2);
 366         struct page *page;
 367         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 368         if (!ino) {
 369                 if (IS_ERR(page))
 370                         return ERR_CAST(page);
 371                 return ERR_PTR(-ENOENT);
 372         }
 373         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 374 }
 375
 376 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 377 {
 378         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 379         struct qstr dot = QSTR_INIT(".", 1);
 380         struct qstr dotdot = QSTR_INIT("..", 2);
 381         struct f2fs_dir_entry *de;
 382         struct page *page;
 383         int err = 0;
 384
 385         if (f2fs_readonly(sbi->sb)) {
 386                 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
 387                           dir->i_ino, pino);
 388                 return 0;
 389         }
 390
 391         err = dquot_initialize(dir);
 392         if (err)
 393                 return err;
 394
 395         f2fs_balance_fs(sbi, true);
 396
 397         f2fs_lock_op(sbi);
 398
 399         de = f2fs_find_entry(dir, &dot, &page);
 400         if (de) {
 401                 f2fs_put_page(page, 0);
 402         } else if (IS_ERR(page)) {
 403                 err = PTR_ERR(page);
 404                 goto out;
 405         } else {
 406                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 407                 if (err)
 408                         goto out;
 409         }
 410
 411         de = f2fs_find_entry(dir, &dotdot, &page);
 412         if (de)
 413                 f2fs_put_page(page, 0);
 414         else if (IS_ERR(page))
 415                 err = PTR_ERR(page);
 416         else
 417                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 418 out:
 419         if (!err)
 420                 clear_inode_flag(dir, FI_INLINE_DOTS);
 421
 422         f2fs_unlock_op(sbi);
 423         return err;
 424 }
 425
 426 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 427                 unsigned int flags)
 428 {
 429         struct inode *inode = NULL;
 430         struct f2fs_dir_entry *de;
 431         struct page *page;
 432         struct dentry *new;
 433         nid_t ino = -1;
 434         int err = 0;
 435         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 436         struct fscrypt_name fname;
 437
 438         trace_f2fs_lookup_start(dir, dentry, flags);
 439
 440         if (dentry->d_name.len > F2FS_NAME_LEN) {
 441                 err = -ENAMETOOLONG;
 442                 goto out;
 443         }
 444
 445         err = fscrypt_prepare_lookup(dir, dentry, &fname);
 446         if (err == -ENOENT)
 447                 goto out_splice;
 448         if (err)
 449                 goto out;
 450         de = __f2fs_find_entry(dir, &fname, &page);
 451         fscrypt_free_filename(&fname);
 452
 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 (IS_ENCRYPTED(dir) &&
 482             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 483             !fscrypt_has_permitted_context(dir, inode)) {
 484                 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
 485                           dir->i_ino, inode->i_ino);
 486                 err = -EPERM;
 487                 goto out_iput;
 488         }
 489 out_splice:
 490 #ifdef CONFIG_UNICODE
 491         if (!inode && IS_CASEFOLDED(dir)) {
 492                 /* Eventually we want to call d_add_ci(dentry, NULL)
 493                  * for negative dentries in the encoding case as
 494                  * well.  For now, prevent the negative dentry
 495                  * from being cached.
 496                  */
 497                 trace_f2fs_lookup_end(dir, dentry, ino, err);
 498                 return NULL;
 499         }
 500 #endif
 501         new = d_splice_alias(inode, dentry);
 502         err = PTR_ERR_OR_ZERO(new);
 503         trace_f2fs_lookup_end(dir, dentry, ino, err);
 504         return new;
 505 out_iput:
 506         iput(inode);
 507 out:
 508         trace_f2fs_lookup_end(dir, dentry, ino, err);
 509         return ERR_PTR(err);
 510 }
 511
 512 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 513 {
 514         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 515         struct inode *inode = d_inode(dentry);
 516         struct f2fs_dir_entry *de;
 517         struct page *page;
 518         int err = -ENOENT;
 519
 520         trace_f2fs_unlink_enter(dir, dentry);
 521
 522         if (unlikely(f2fs_cp_error(sbi)))
 523                 return -EIO;
 524
 525         err = dquot_initialize(dir);
 526         if (err)
 527                 return err;
 528         err = dquot_initialize(inode);
 529         if (err)
 530                 return err;
 531
 532         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 533         if (!de) {
 534                 if (IS_ERR(page))
 535                         err = PTR_ERR(page);
 536                 goto fail;
 537         }
 538
 539         f2fs_balance_fs(sbi, true);
 540
 541         f2fs_lock_op(sbi);
 542         err = f2fs_acquire_orphan_inode(sbi);
 543         if (err) {
 544                 f2fs_unlock_op(sbi);
 545                 f2fs_put_page(page, 0);
 546                 goto fail;
 547         }
 548         f2fs_delete_entry(de, page, dir, inode);
 549 #ifdef CONFIG_UNICODE
 550         /* VFS negative dentries are incompatible with Encoding and
 551          * Case-insensitiveness. Eventually we'll want avoid
 552          * invalidating the dentries here, alongside with returning the
 553          * negative dentries at f2fs_lookup(), when it is  better
 554          * supported by the VFS for the CI case.
 555          */
 556         if (IS_CASEFOLDED(dir))
 557                 d_invalidate(dentry);
 558 #endif
 559         f2fs_unlock_op(sbi);
 560
 561         if (IS_DIRSYNC(dir))
 562                 f2fs_sync_fs(sbi->sb, 1);
 563 fail:
 564         trace_f2fs_unlink_exit(inode, err);
 565         return err;
 566 }
 567
 568 static const char *f2fs_get_link(struct dentry *dentry,
 569                                  struct inode *inode,
 570                                  struct delayed_call *done)
 571 {
 572         const char *link = page_get_link(dentry, inode, done);
 573         if (!IS_ERR(link) && !*link) {
 574                 /* this is broken symlink case */
 575                 do_delayed_call(done);
 576                 clear_delayed_call(done);
 577                 link = ERR_PTR(-ENOENT);
 578         }
 579         return link;
 580 }
 581
 582 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 583                                         const char *symname)
 584 {
 585         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 586         struct inode *inode;
 587         size_t len = strlen(symname);
 588         struct fscrypt_str disk_link;
 589         int err;
 590
 591         if (unlikely(f2fs_cp_error(sbi)))
 592                 return -EIO;
 593         if (!f2fs_is_checkpoint_ready(sbi))
 594                 return -ENOSPC;
 595
 596         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 597                                       &disk_link);
 598         if (err)
 599                 return err;
 600
 601         err = dquot_initialize(dir);
 602         if (err)
 603                 return err;
 604
 605         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 606         if (IS_ERR(inode))
 607                 return PTR_ERR(inode);
 608
 609         if (IS_ENCRYPTED(inode))
 610                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 611         else
 612                 inode->i_op = &f2fs_symlink_inode_operations;
 613         inode_nohighmem(inode);
 614         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 615
 616         f2fs_lock_op(sbi);
 617         err = f2fs_add_link(dentry, inode);
 618         if (err)
 619                 goto out_f2fs_handle_failed_inode;
 620         f2fs_unlock_op(sbi);
 621         f2fs_alloc_nid_done(sbi, inode->i_ino);
 622
 623         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 624         if (err)
 625                 goto err_out;
 626
 627         err = page_symlink(inode, disk_link.name, disk_link.len);
 628
 629 err_out:
 630         d_instantiate_new(dentry, inode);
 631
 632         /*
 633          * Let's flush symlink data in order to avoid broken symlink as much as
 634          * possible. Nevertheless, fsyncing is the best way, but there is no
 635          * way to get a file descriptor in order to flush that.
 636          *
 637          * Note that, it needs to do dir->fsync to make this recoverable.
 638          * If the symlink path is stored into inline_data, there is no
 639          * performance regression.
 640          */
 641         if (!err) {
 642                 filemap_write_and_wait_range(inode->i_mapping, 0,
 643                                                         disk_link.len - 1);
 644
 645                 if (IS_DIRSYNC(dir))
 646                         f2fs_sync_fs(sbi->sb, 1);
 647         } else {
 648                 f2fs_unlink(dir, dentry);
 649         }
 650
 651         f2fs_balance_fs(sbi, true);
 652         goto out_free_encrypted_link;
 653
 654 out_f2fs_handle_failed_inode:
 655         f2fs_handle_failed_inode(inode);
 656 out_free_encrypted_link:
 657         if (disk_link.name != (unsigned char *)symname)
 658                 kvfree(disk_link.name);
 659         return err;
 660 }
 661
 662 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 663 {
 664         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 665         struct inode *inode;
 666         int err;
 667
 668         if (unlikely(f2fs_cp_error(sbi)))
 669                 return -EIO;
 670
 671         err = dquot_initialize(dir);
 672         if (err)
 673                 return err;
 674
 675         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 676         if (IS_ERR(inode))
 677                 return PTR_ERR(inode);
 678
 679         inode->i_op = &f2fs_dir_inode_operations;
 680         inode->i_fop = &f2fs_dir_operations;
 681         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 682         inode_nohighmem(inode);
 683
 684         set_inode_flag(inode, FI_INC_LINK);
 685         f2fs_lock_op(sbi);
 686         err = f2fs_add_link(dentry, inode);
 687         if (err)
 688                 goto out_fail;
 689         f2fs_unlock_op(sbi);
 690
 691         f2fs_alloc_nid_done(sbi, inode->i_ino);
 692
 693         d_instantiate_new(dentry, inode);
 694
 695         if (IS_DIRSYNC(dir))
 696                 f2fs_sync_fs(sbi->sb, 1);
 697
 698         f2fs_balance_fs(sbi, true);
 699         return 0;
 700
 701 out_fail:
 702         clear_inode_flag(inode, FI_INC_LINK);
 703         f2fs_handle_failed_inode(inode);
 704         return err;
 705 }
 706
 707 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 708 {
 709         struct inode *inode = d_inode(dentry);
 710         if (f2fs_empty_dir(inode))
 711                 return f2fs_unlink(dir, dentry);
 712         return -ENOTEMPTY;
 713 }
 714
 715 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 716                                 umode_t mode, dev_t rdev)
 717 {
 718         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 719         struct inode *inode;
 720         int err = 0;
 721
 722         if (unlikely(f2fs_cp_error(sbi)))
 723                 return -EIO;
 724         if (!f2fs_is_checkpoint_ready(sbi))
 725                 return -ENOSPC;
 726
 727         err = dquot_initialize(dir);
 728         if (err)
 729                 return err;
 730
 731         inode = f2fs_new_inode(dir, mode);
 732         if (IS_ERR(inode))
 733                 return PTR_ERR(inode);
 734
 735         init_special_inode(inode, inode->i_mode, rdev);
 736         inode->i_op = &f2fs_special_inode_operations;
 737
 738         f2fs_lock_op(sbi);
 739         err = f2fs_add_link(dentry, inode);
 740         if (err)
 741                 goto out;
 742         f2fs_unlock_op(sbi);
 743
 744         f2fs_alloc_nid_done(sbi, inode->i_ino);
 745
 746         d_instantiate_new(dentry, inode);
 747
 748         if (IS_DIRSYNC(dir))
 749                 f2fs_sync_fs(sbi->sb, 1);
 750
 751         f2fs_balance_fs(sbi, true);
 752         return 0;
 753 out:
 754         f2fs_handle_failed_inode(inode);
 755         return err;
 756 }
 757
 758 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 759                                         umode_t mode, struct inode **whiteout)
 760 {
 761         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 762         struct inode *inode;
 763         int err;
 764
 765         err = dquot_initialize(dir);
 766         if (err)
 767                 return err;
 768
 769         inode = f2fs_new_inode(dir, mode);
 770         if (IS_ERR(inode))
 771                 return PTR_ERR(inode);
 772
 773         if (whiteout) {
 774                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 775                 inode->i_op = &f2fs_special_inode_operations;
 776         } else {
 777                 inode->i_op = &f2fs_file_inode_operations;
 778                 inode->i_fop = &f2fs_file_operations;
 779                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 780         }
 781
 782         f2fs_lock_op(sbi);
 783         err = f2fs_acquire_orphan_inode(sbi);
 784         if (err)
 785                 goto out;
 786
 787         err = f2fs_do_tmpfile(inode, dir);
 788         if (err)
 789                 goto release_out;
 790
 791         /*
 792          * add this non-linked tmpfile to orphan list, in this way we could
 793          * remove all unused data of tmpfile after abnormal power-off.
 794          */
 795         f2fs_add_orphan_inode(inode);
 796         f2fs_alloc_nid_done(sbi, inode->i_ino);
 797
 798         if (whiteout) {
 799                 f2fs_i_links_write(inode, false);
 800                 *whiteout = inode;
 801         } else {
 802                 d_tmpfile(dentry, inode);
 803         }
 804         /* link_count was changed by d_tmpfile as well. */
 805         f2fs_unlock_op(sbi);
 806         unlock_new_inode(inode);
 807
 808         f2fs_balance_fs(sbi, true);
 809         return 0;
 810
 811 release_out:
 812         f2fs_release_orphan_inode(sbi);
 813 out:
 814         f2fs_handle_failed_inode(inode);
 815         return err;
 816 }
 817
 818 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 819 {
 820         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 821
 822         if (unlikely(f2fs_cp_error(sbi)))
 823                 return -EIO;
 824         if (!f2fs_is_checkpoint_ready(sbi))
 825                 return -ENOSPC;
 826
 827         if (IS_ENCRYPTED(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 828                 int err = fscrypt_get_encryption_info(dir);
 829                 if (err)
 830                         return err;
 831         }
 832
 833         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 834 }
 835
 836 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 837 {
 838         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 839                 return -EIO;
 840
 841         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 842 }
 843
 844 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 845                         struct inode *new_dir, struct dentry *new_dentry,
 846                         unsigned int flags)
 847 {
 848         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 849         struct inode *old_inode = d_inode(old_dentry);
 850         struct inode *new_inode = d_inode(new_dentry);
 851         struct inode *whiteout = NULL;
 852         struct page *old_dir_page;
 853         struct page *old_page, *new_page = NULL;
 854         struct f2fs_dir_entry *old_dir_entry = NULL;
 855         struct f2fs_dir_entry *old_entry;
 856         struct f2fs_dir_entry *new_entry;
 857         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 858         int err;
 859
 860         if (unlikely(f2fs_cp_error(sbi)))
 861                 return -EIO;
 862         if (!f2fs_is_checkpoint_ready(sbi))
 863                 return -ENOSPC;
 864
 865         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 866                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 867                         F2FS_I(old_dentry->d_inode)->i_projid)))
 868                 return -EXDEV;
 869
 870         err = dquot_initialize(old_dir);
 871         if (err)
 872                 goto out;
 873
 874         err = dquot_initialize(new_dir);
 875         if (err)
 876                 goto out;
 877
 878         if (new_inode) {
 879                 err = dquot_initialize(new_inode);
 880                 if (err)
 881                         goto out;
 882         }
 883
 884         err = -ENOENT;
 885         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 886         if (!old_entry) {
 887                 if (IS_ERR(old_page))
 888                         err = PTR_ERR(old_page);
 889                 goto out;
 890         }
 891
 892         if (S_ISDIR(old_inode->i_mode)) {
 893                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 894                 if (!old_dir_entry) {
 895                         if (IS_ERR(old_dir_page))
 896                                 err = PTR_ERR(old_dir_page);
 897                         goto out_old;
 898                 }
 899         }
 900
 901         if (flags & RENAME_WHITEOUT) {
 902                 err = f2fs_create_whiteout(old_dir, &whiteout);
 903                 if (err)
 904                         goto out_dir;
 905         }
 906
 907         if (new_inode) {
 908
 909                 err = -ENOTEMPTY;
 910                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 911                         goto out_whiteout;
 912
 913                 err = -ENOENT;
 914                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 915                                                 &new_page);
 916                 if (!new_entry) {
 917                         if (IS_ERR(new_page))
 918                                 err = PTR_ERR(new_page);
 919                         goto out_whiteout;
 920                 }
 921
 922                 f2fs_balance_fs(sbi, true);
 923
 924                 f2fs_lock_op(sbi);
 925
 926                 err = f2fs_acquire_orphan_inode(sbi);
 927                 if (err)
 928                         goto put_out_dir;
 929
 930                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 931
 932                 new_inode->i_ctime = current_time(new_inode);
 933                 down_write(&F2FS_I(new_inode)->i_sem);
 934                 if (old_dir_entry)
 935                         f2fs_i_links_write(new_inode, false);
 936                 f2fs_i_links_write(new_inode, false);
 937                 up_write(&F2FS_I(new_inode)->i_sem);
 938
 939                 if (!new_inode->i_nlink)
 940                         f2fs_add_orphan_inode(new_inode);
 941                 else
 942                         f2fs_release_orphan_inode(sbi);
 943         } else {
 944                 f2fs_balance_fs(sbi, true);
 945
 946                 f2fs_lock_op(sbi);
 947
 948                 err = f2fs_add_link(new_dentry, old_inode);
 949                 if (err) {
 950                         f2fs_unlock_op(sbi);
 951                         goto out_whiteout;
 952                 }
 953
 954                 if (old_dir_entry)
 955                         f2fs_i_links_write(new_dir, true);
 956
 957                 /*
 958                  * old entry and new entry can locate in the same inline
 959                  * dentry in inode, when attaching new entry in inline dentry,
 960                  * it could force inline dentry conversion, after that,
 961                  * old_entry and old_page will point to wrong address, in
 962                  * order to avoid this, let's do the check and update here.
 963                  */
 964                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 965                         f2fs_put_page(old_page, 0);
 966                         old_page = NULL;
 967
 968                         old_entry = f2fs_find_entry(old_dir,
 969                                                 &old_dentry->d_name, &old_page);
 970                         if (!old_entry) {
 971                                 err = -ENOENT;
 972                                 if (IS_ERR(old_page))
 973                                         err = PTR_ERR(old_page);
 974                                 f2fs_unlock_op(sbi);
 975                                 goto out_whiteout;
 976                         }
 977                 }
 978         }
 979
 980         down_write(&F2FS_I(old_inode)->i_sem);
 981         if (!old_dir_entry || whiteout)
 982                 file_lost_pino(old_inode);
 983         else
 984                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 985         up_write(&F2FS_I(old_inode)->i_sem);
 986
 987         old_inode->i_ctime = current_time(old_inode);
 988         f2fs_mark_inode_dirty_sync(old_inode, false);
 989
 990         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 991
 992         if (whiteout) {
 993                 whiteout->i_state |= I_LINKABLE;
 994                 set_inode_flag(whiteout, FI_INC_LINK);
 995                 err = f2fs_add_link(old_dentry, whiteout);
 996                 if (err)
 997                         goto put_out_dir;
 998                 whiteout->i_state &= ~I_LINKABLE;
 999                 iput(whiteout);
1000         }
1001
1002         if (old_dir_entry) {
1003                 if (old_dir != new_dir && !whiteout)
1004                         f2fs_set_link(old_inode, old_dir_entry,
1005                                                 old_dir_page, new_dir);
1006                 else
1007                         f2fs_put_page(old_dir_page, 0);
1008                 f2fs_i_links_write(old_dir, false);
1009         }
1010         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1011                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1012                 if (S_ISDIR(old_inode->i_mode))
1013                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
1014                                                         TRANS_DIR_INO);
1015         }
1016
1017         f2fs_unlock_op(sbi);
1018
1019         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1020                 f2fs_sync_fs(sbi->sb, 1);
1021
1022         f2fs_update_time(sbi, REQ_TIME);
1023         return 0;
1024
1025 put_out_dir:
1026         f2fs_unlock_op(sbi);
1027         if (new_page)
1028                 f2fs_put_page(new_page, 0);
1029 out_whiteout:
1030         if (whiteout)
1031                 iput(whiteout);
1032 out_dir:
1033         if (old_dir_entry)
1034                 f2fs_put_page(old_dir_page, 0);
1035 out_old:
1036         f2fs_put_page(old_page, 0);
1037 out:
1038         return err;
1039 }
1040
1041 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1042                              struct inode *new_dir, struct dentry *new_dentry)
1043 {
1044         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1045         struct inode *old_inode = d_inode(old_dentry);
1046         struct inode *new_inode = d_inode(new_dentry);
1047         struct page *old_dir_page, *new_dir_page;
1048         struct page *old_page, *new_page;
1049         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1050         struct f2fs_dir_entry *old_entry, *new_entry;
1051         int old_nlink = 0, new_nlink = 0;
1052         int err;
1053
1054         if (unlikely(f2fs_cp_error(sbi)))
1055                 return -EIO;
1056         if (!f2fs_is_checkpoint_ready(sbi))
1057                 return -ENOSPC;
1058
1059         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1060                         !projid_eq(F2FS_I(new_dir)->i_projid,
1061                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1062             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1063                         !projid_eq(F2FS_I(old_dir)->i_projid,
1064                         F2FS_I(new_dentry->d_inode)->i_projid)))
1065                 return -EXDEV;
1066
1067         err = dquot_initialize(old_dir);
1068         if (err)
1069                 goto out;
1070
1071         err = dquot_initialize(new_dir);
1072         if (err)
1073                 goto out;
1074
1075         err = -ENOENT;
1076         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1077         if (!old_entry) {
1078                 if (IS_ERR(old_page))
1079                         err = PTR_ERR(old_page);
1080                 goto out;
1081         }
1082
1083         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1084         if (!new_entry) {
1085                 if (IS_ERR(new_page))
1086                         err = PTR_ERR(new_page);
1087                 goto out_old;
1088         }
1089
1090         /* prepare for updating ".." directory entry info later */
1091         if (old_dir != new_dir) {
1092                 if (S_ISDIR(old_inode->i_mode)) {
1093                         old_dir_entry = f2fs_parent_dir(old_inode,
1094                                                         &old_dir_page);
1095                         if (!old_dir_entry) {
1096                                 if (IS_ERR(old_dir_page))
1097                                         err = PTR_ERR(old_dir_page);
1098                                 goto out_new;
1099                         }
1100                 }
1101
1102                 if (S_ISDIR(new_inode->i_mode)) {
1103                         new_dir_entry = f2fs_parent_dir(new_inode,
1104                                                         &new_dir_page);
1105                         if (!new_dir_entry) {
1106                                 if (IS_ERR(new_dir_page))
1107                                         err = PTR_ERR(new_dir_page);
1108                                 goto out_old_dir;
1109                         }
1110                 }
1111         }
1112
1113         /*
1114          * If cross rename between file and directory those are not
1115          * in the same directory, we will inc nlink of file's parent
1116          * later, so we should check upper boundary of its nlink.
1117          */
1118         if ((!old_dir_entry || !new_dir_entry) &&
1119                                 old_dir_entry != new_dir_entry) {
1120                 old_nlink = old_dir_entry ? -1 : 1;
1121                 new_nlink = -old_nlink;
1122                 err = -EMLINK;
1123                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1124                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1125                         goto out_new_dir;
1126         }
1127
1128         f2fs_balance_fs(sbi, true);
1129
1130         f2fs_lock_op(sbi);
1131
1132         /* update ".." directory entry info of old dentry */
1133         if (old_dir_entry)
1134                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1135
1136         /* update ".." directory entry info of new dentry */
1137         if (new_dir_entry)
1138                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1139
1140         /* update directory entry info of old dir inode */
1141         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1142
1143         down_write(&F2FS_I(old_inode)->i_sem);
1144         file_lost_pino(old_inode);
1145         up_write(&F2FS_I(old_inode)->i_sem);
1146
1147         old_dir->i_ctime = current_time(old_dir);
1148         if (old_nlink) {
1149                 down_write(&F2FS_I(old_dir)->i_sem);
1150                 f2fs_i_links_write(old_dir, old_nlink > 0);
1151                 up_write(&F2FS_I(old_dir)->i_sem);
1152         }
1153         f2fs_mark_inode_dirty_sync(old_dir, false);
1154
1155         /* update directory entry info of new dir inode */
1156         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1157
1158         down_write(&F2FS_I(new_inode)->i_sem);
1159         file_lost_pino(new_inode);
1160         up_write(&F2FS_I(new_inode)->i_sem);
1161
1162         new_dir->i_ctime = current_time(new_dir);
1163         if (new_nlink) {
1164                 down_write(&F2FS_I(new_dir)->i_sem);
1165                 f2fs_i_links_write(new_dir, new_nlink > 0);
1166                 up_write(&F2FS_I(new_dir)->i_sem);
1167         }
1168         f2fs_mark_inode_dirty_sync(new_dir, false);
1169
1170         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1171                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1172                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1173         }
1174
1175         f2fs_unlock_op(sbi);
1176
1177         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1178                 f2fs_sync_fs(sbi->sb, 1);
1179
1180         f2fs_update_time(sbi, REQ_TIME);
1181         return 0;
1182 out_new_dir:
1183         if (new_dir_entry) {
1184                 f2fs_put_page(new_dir_page, 0);
1185         }
1186 out_old_dir:
1187         if (old_dir_entry) {
1188                 f2fs_put_page(old_dir_page, 0);
1189         }
1190 out_new:
1191         f2fs_put_page(new_page, 0);
1192 out_old:
1193         f2fs_put_page(old_page, 0);
1194 out:
1195         return err;
1196 }
1197
1198 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1199                         struct inode *new_dir, struct dentry *new_dentry,
1200                         unsigned int flags)
1201 {
1202         int err;
1203
1204         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1205                 return -EINVAL;
1206
1207         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1208                                      flags);
1209         if (err)
1210                 return err;
1211
1212         if (flags & RENAME_EXCHANGE) {
1213                 return f2fs_cross_rename(old_dir, old_dentry,
1214                                          new_dir, new_dentry);
1215         }
1216         /*
1217          * VFS has already handled the new dentry existence case,
1218          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1219          */
1220         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1221 }
1222
1223 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1224                                            struct inode *inode,
1225                                            struct delayed_call *done)
1226 {
1227         struct page *page;
1228         const char *target;
1229
1230         if (!dentry)
1231                 return ERR_PTR(-ECHILD);
1232
1233         page = read_mapping_page(inode->i_mapping, 0, NULL);
1234         if (IS_ERR(page))
1235                 return ERR_CAST(page);
1236
1237         target = fscrypt_get_symlink(inode, page_address(page),
1238                                      inode->i_sb->s_blocksize, done);
1239         put_page(page);
1240         return target;
1241 }
1242
1243 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1244         .get_link       = f2fs_encrypted_get_link,
1245         .getattr        = f2fs_getattr,
1246         .setattr        = f2fs_setattr,
1247 #ifdef CONFIG_F2FS_FS_XATTR
1248         .listxattr      = f2fs_listxattr,
1249 #endif
1250 };
1251
1252 const struct inode_operations f2fs_dir_inode_operations = {
1253         .create         = f2fs_create,
1254         .lookup         = f2fs_lookup,
1255         .link           = f2fs_link,
1256         .unlink         = f2fs_unlink,
1257         .symlink        = f2fs_symlink,
1258         .mkdir          = f2fs_mkdir,
1259         .rmdir          = f2fs_rmdir,
1260         .mknod          = f2fs_mknod,
1261         .rename         = f2fs_rename2,
1262         .tmpfile        = f2fs_tmpfile,
1263         .getattr        = f2fs_getattr,
1264         .setattr        = f2fs_setattr,
1265         .get_acl        = f2fs_get_acl,
1266         .set_acl        = f2fs_set_acl,
1267 #ifdef CONFIG_F2FS_FS_XATTR
1268         .listxattr      = f2fs_listxattr,
1269 #endif
1270         .fiemap         = f2fs_fiemap,
1271 };
1272
1273 const struct inode_operations f2fs_symlink_inode_operations = {
1274         .get_link       = f2fs_get_link,
1275         .getattr        = f2fs_getattr,
1276         .setattr        = f2fs_setattr,
1277 #ifdef CONFIG_F2FS_FS_XATTR
1278         .listxattr      = f2fs_listxattr,
1279 #endif
1280 };
1281
1282 const struct inode_operations f2fs_special_inode_operations = {
1283         .getattr        = f2fs_getattr,
1284         .setattr        = f2fs_setattr,
1285         .get_acl        = f2fs_get_acl,
1286         .set_acl        = f2fs_set_acl,
1287 #ifdef CONFIG_F2FS_FS_XATTR
1288         .listxattr      = f2fs_listxattr,
1289 #endif
1290 };