fs/f2fs/namei.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/namei.c
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  */
   8 #include <linux/fs.h>
   9 #include <linux/f2fs_fs.h>
  10 #include <linux/pagemap.h>
  11 #include <linux/sched.h>
  12 #include <linux/ctype.h>
  13 #include <linux/random.h>
  14 #include <linux/dcache.h>
  15 #include <linux/namei.h>
  16 #include <linux/quotaops.h>
  17
  18 #include "f2fs.h"
  19 #include "node.h"
  20 #include "segment.h"
  21 #include "xattr.h"
  22 #include "acl.h"
  23 #include <trace/events/f2fs.h>
  24
  25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  26 {
  27         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  28         nid_t ino;
  29         struct inode *inode;
  30         bool nid_free = false;
  31         int xattr_size = 0;
  32         int err;
  33
  34         inode = new_inode(dir->i_sb);
  35         if (!inode)
  36                 return ERR_PTR(-ENOMEM);
  37
  38         f2fs_lock_op(sbi);
  39         if (!f2fs_alloc_nid(sbi, &ino)) {
  40                 f2fs_unlock_op(sbi);
  41                 err = -ENOSPC;
  42                 goto fail;
  43         }
  44         f2fs_unlock_op(sbi);
  45
  46         nid_free = true;
  47
  48         inode_init_owner(inode, dir, mode);
  49
  50         inode->i_ino = ino;
  51         inode->i_blocks = 0;
  52         inode->i_mtime = inode->i_atime = inode->i_ctime =
  53                         F2FS_I(inode)->i_crtime = current_time(inode);
  54         inode->i_generation = prandom_u32();
  55
  56         if (S_ISDIR(inode->i_mode))
  57                 F2FS_I(inode)->i_current_depth = 1;
  58
  59         err = insert_inode_locked(inode);
  60         if (err) {
  61                 err = -EINVAL;
  62                 goto fail;
  63         }
  64
  65         if (f2fs_sb_has_project_quota(sbi) &&
  66                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
  67                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  68         else
  69                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  70                                                         F2FS_DEF_PROJID);
  71
  72         err = dquot_initialize(inode);
  73         if (err)
  74                 goto fail_drop;
  75
  76         set_inode_flag(inode, FI_NEW_INODE);
  77
  78         /* If the directory encrypted, then we should encrypt the inode. */
  79         if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
  80                                 f2fs_may_encrypt(inode))
  81                 f2fs_set_encrypted_inode(inode);
  82
  83         if (f2fs_sb_has_extra_attr(sbi)) {
  84                 set_inode_flag(inode, FI_EXTRA_ATTR);
  85                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  86         }
  87
  88         if (test_opt(sbi, INLINE_XATTR))
  89                 set_inode_flag(inode, FI_INLINE_XATTR);
  90
  91         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  92                 set_inode_flag(inode, FI_INLINE_DATA);
  93         if (f2fs_may_inline_dentry(inode))
  94                 set_inode_flag(inode, FI_INLINE_DENTRY);
  95
  96         if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
  97                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
  98                 if (f2fs_has_inline_xattr(inode))
  99                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
 100                 /* Otherwise, will be 0 */
 101         } else if (f2fs_has_inline_xattr(inode) ||
 102                                 f2fs_has_inline_dentry(inode)) {
 103                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 104         }
 105         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 106
 107         f2fs_init_extent_tree(inode, NULL);
 108
 109         stat_inc_inline_xattr(inode);
 110         stat_inc_inline_inode(inode);
 111         stat_inc_inline_dir(inode);
 112
 113         F2FS_I(inode)->i_flags =
 114                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 115
 116         if (S_ISDIR(inode->i_mode))
 117                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
 118
 119         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
 120                 set_inode_flag(inode, FI_PROJ_INHERIT);
 121
 122         f2fs_set_inode_flags(inode);
 123
 124         trace_f2fs_new_inode(inode, 0);
 125         return inode;
 126
 127 fail:
 128         trace_f2fs_new_inode(inode, err);
 129         make_bad_inode(inode);
 130         if (nid_free)
 131                 set_inode_flag(inode, FI_FREE_NID);
 132         iput(inode);
 133         return ERR_PTR(err);
 134 fail_drop:
 135         trace_f2fs_new_inode(inode, err);
 136         dquot_drop(inode);
 137         inode->i_flags |= S_NOQUOTA;
 138         if (nid_free)
 139                 set_inode_flag(inode, FI_FREE_NID);
 140         clear_nlink(inode);
 141         unlock_new_inode(inode);
 142         iput(inode);
 143         return ERR_PTR(err);
 144 }
 145
 146 static inline int is_extension_exist(const unsigned char *s, const char *sub)
 147 {
 148         size_t slen = strlen(s);
 149         size_t sublen = strlen(sub);
 150         int i;
 151
 152         /*
 153          * filename format of multimedia file should be defined as:
 154          * "filename + '.' + extension + (optional: '.' + temp extension)".
 155          */
 156         if (slen < sublen + 2)
 157                 return 0;
 158
 159         for (i = 1; i < slen - sublen; i++) {
 160                 if (s[i] != '.')
 161                         continue;
 162                 if (!strncasecmp(s + i + 1, sub, sublen))
 163                         return 1;
 164         }
 165
 166         return 0;
 167 }
 168
 169 /*
 170  * Set multimedia files as cold files for hot/cold data separation
 171  */
 172 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 173                 const unsigned char *name)
 174 {
 175         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 176         int i, cold_count, hot_count;
 177
 178         down_read(&sbi->sb_lock);
 179
 180         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 181         hot_count = sbi->raw_super->hot_ext_count;
 182
 183         for (i = 0; i < cold_count + hot_count; i++) {
 184                 if (is_extension_exist(name, extlist[i]))
 185                         break;
 186         }
 187
 188         up_read(&sbi->sb_lock);
 189
 190         if (i == cold_count + hot_count)
 191                 return;
 192
 193         if (i < cold_count)
 194                 file_set_cold(inode);
 195         else
 196                 file_set_hot(inode);
 197 }
 198
 199 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 200                                                         bool hot, bool set)
 201 {
 202         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 203         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 204         int hot_count = sbi->raw_super->hot_ext_count;
 205         int total_count = cold_count + hot_count;
 206         int start, count;
 207         int i;
 208
 209         if (set) {
 210                 if (total_count == F2FS_MAX_EXTENSION)
 211                         return -EINVAL;
 212         } else {
 213                 if (!hot && !cold_count)
 214                         return -EINVAL;
 215                 if (hot && !hot_count)
 216                         return -EINVAL;
 217         }
 218
 219         if (hot) {
 220                 start = cold_count;
 221                 count = total_count;
 222         } else {
 223                 start = 0;
 224                 count = cold_count;
 225         }
 226
 227         for (i = start; i < count; i++) {
 228                 if (strcmp(name, extlist[i]))
 229                         continue;
 230
 231                 if (set)
 232                         return -EINVAL;
 233
 234                 memcpy(extlist[i], extlist[i + 1],
 235                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 236                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 237                 if (hot)
 238                         sbi->raw_super->hot_ext_count = hot_count - 1;
 239                 else
 240                         sbi->raw_super->extension_count =
 241                                                 cpu_to_le32(cold_count - 1);
 242                 return 0;
 243         }
 244
 245         if (!set)
 246                 return -EINVAL;
 247
 248         if (hot) {
 249                 memcpy(extlist[count], name, strlen(name));
 250                 sbi->raw_super->hot_ext_count = hot_count + 1;
 251         } else {
 252                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 253
 254                 memcpy(buf, &extlist[cold_count],
 255                                 F2FS_EXTENSION_LEN * hot_count);
 256                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 257                 memcpy(extlist[cold_count], name, strlen(name));
 258                 memcpy(&extlist[cold_count + 1], buf,
 259                                 F2FS_EXTENSION_LEN * hot_count);
 260                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 261         }
 262         return 0;
 263 }
 264
 265 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 266                                                 bool excl)
 267 {
 268         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 269         struct inode *inode;
 270         nid_t ino = 0;
 271         int err;
 272
 273         if (unlikely(f2fs_cp_error(sbi)))
 274                 return -EIO;
 275         err = f2fs_is_checkpoint_ready(sbi);
 276         if (err)
 277                 return err;
 278
 279         err = dquot_initialize(dir);
 280         if (err)
 281                 return err;
 282
 283         inode = f2fs_new_inode(dir, mode);
 284         if (IS_ERR(inode))
 285                 return PTR_ERR(inode);
 286
 287         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 288                 set_file_temperature(sbi, inode, dentry->d_name.name);
 289
 290         inode->i_op = &f2fs_file_inode_operations;
 291         inode->i_fop = &f2fs_file_operations;
 292         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 293         ino = inode->i_ino;
 294
 295         f2fs_lock_op(sbi);
 296         err = f2fs_add_link(dentry, inode);
 297         if (err)
 298                 goto out;
 299         f2fs_unlock_op(sbi);
 300
 301         f2fs_alloc_nid_done(sbi, ino);
 302
 303         d_instantiate(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_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
 390                           dir->i_ino, pino);
 391                 return 0;
 392         }
 393
 394         err = dquot_initialize(dir);
 395         if (err)
 396                 return err;
 397
 398         f2fs_balance_fs(sbi, true);
 399
 400         f2fs_lock_op(sbi);
 401
 402         de = f2fs_find_entry(dir, &dot, &page);
 403         if (de) {
 404                 f2fs_put_page(page, 0);
 405         } else if (IS_ERR(page)) {
 406                 err = PTR_ERR(page);
 407                 goto out;
 408         } else {
 409                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 410                 if (err)
 411                         goto out;
 412         }
 413
 414         de = f2fs_find_entry(dir, &dotdot, &page);
 415         if (de)
 416                 f2fs_put_page(page, 0);
 417         else if (IS_ERR(page))
 418                 err = PTR_ERR(page);
 419         else
 420                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 421 out:
 422         if (!err)
 423                 clear_inode_flag(dir, FI_INLINE_DOTS);
 424
 425         f2fs_unlock_op(sbi);
 426         return err;
 427 }
 428
 429 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 430                 unsigned int flags)
 431 {
 432         struct inode *inode = NULL;
 433         struct f2fs_dir_entry *de;
 434         struct page *page;
 435         struct dentry *new;
 436         nid_t ino = -1;
 437         int err = 0;
 438         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 439
 440         trace_f2fs_lookup_start(dir, dentry, flags);
 441
 442         err = fscrypt_prepare_lookup(dir, dentry, flags);
 443         if (err)
 444                 goto out;
 445
 446         if (dentry->d_name.len > F2FS_NAME_LEN) {
 447                 err = -ENAMETOOLONG;
 448                 goto out;
 449         }
 450
 451         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 452         if (!de) {
 453                 if (IS_ERR(page)) {
 454                         err = PTR_ERR(page);
 455                         goto out;
 456                 }
 457                 goto out_splice;
 458         }
 459
 460         ino = le32_to_cpu(de->ino);
 461         f2fs_put_page(page, 0);
 462
 463         inode = f2fs_iget(dir->i_sb, ino);
 464         if (IS_ERR(inode)) {
 465                 err = PTR_ERR(inode);
 466                 goto out;
 467         }
 468
 469         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 470                 err = __recover_dot_dentries(dir, root_ino);
 471                 if (err)
 472                         goto out_iput;
 473         }
 474
 475         if (f2fs_has_inline_dots(inode)) {
 476                 err = __recover_dot_dentries(inode, dir->i_ino);
 477                 if (err)
 478                         goto out_iput;
 479         }
 480         if (f2fs_encrypted_inode(dir) &&
 481             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 482             !fscrypt_has_permitted_context(dir, inode)) {
 483                 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
 484                           dir->i_ino, inode->i_ino);
 485                 err = -EPERM;
 486                 goto out_iput;
 487         }
 488 out_splice:
 489         new = d_splice_alias(inode, dentry);
 490         if (IS_ERR(new))
 491                 err = PTR_ERR(new);
 492         trace_f2fs_lookup_end(dir, dentry, ino, err);
 493         return new;
 494 out_iput:
 495         iput(inode);
 496 out:
 497         trace_f2fs_lookup_end(dir, dentry, ino, err);
 498         return ERR_PTR(err);
 499 }
 500
 501 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 502 {
 503         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 504         struct inode *inode = d_inode(dentry);
 505         struct f2fs_dir_entry *de;
 506         struct page *page;
 507         int err = -ENOENT;
 508
 509         trace_f2fs_unlink_enter(dir, dentry);
 510
 511         if (unlikely(f2fs_cp_error(sbi)))
 512                 return -EIO;
 513
 514         err = dquot_initialize(dir);
 515         if (err)
 516                 return err;
 517         err = dquot_initialize(inode);
 518         if (err)
 519                 return err;
 520
 521         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 522         if (!de) {
 523                 if (IS_ERR(page))
 524                         err = PTR_ERR(page);
 525                 goto fail;
 526         }
 527
 528         f2fs_balance_fs(sbi, true);
 529
 530         f2fs_lock_op(sbi);
 531         err = f2fs_acquire_orphan_inode(sbi);
 532         if (err) {
 533                 f2fs_unlock_op(sbi);
 534                 f2fs_put_page(page, 0);
 535                 goto fail;
 536         }
 537         f2fs_delete_entry(de, page, dir, inode);
 538         f2fs_unlock_op(sbi);
 539
 540         if (IS_DIRSYNC(dir))
 541                 f2fs_sync_fs(sbi->sb, 1);
 542 fail:
 543         trace_f2fs_unlink_exit(inode, err);
 544         return err;
 545 }
 546
 547 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
 548 {
 549         const char *link = page_follow_link_light(dentry, cookie);
 550         if (!IS_ERR(link) && !*link) {
 551                 /* this is broken symlink case */
 552                 page_put_link(NULL, *cookie);
 553                 link = ERR_PTR(-ENOENT);
 554         }
 555         return link;
 556 }
 557
 558 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 559                                         const char *symname)
 560 {
 561         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 562         struct inode *inode;
 563         size_t len = strlen(symname);
 564         struct fscrypt_str disk_link;
 565         int err;
 566
 567         if (unlikely(f2fs_cp_error(sbi)))
 568                 return -EIO;
 569         err = f2fs_is_checkpoint_ready(sbi);
 570         if (err)
 571                 return err;
 572
 573         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 574                                       &disk_link);
 575         if (err)
 576                 return err;
 577
 578         err = dquot_initialize(dir);
 579         if (err)
 580                 return err;
 581
 582         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 583         if (IS_ERR(inode))
 584                 return PTR_ERR(inode);
 585
 586         if (IS_ENCRYPTED(inode))
 587                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 588         else
 589                 inode->i_op = &f2fs_symlink_inode_operations;
 590         inode_nohighmem(inode);
 591         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 592
 593         f2fs_lock_op(sbi);
 594         err = f2fs_add_link(dentry, inode);
 595         if (err)
 596                 goto out_f2fs_handle_failed_inode;
 597         f2fs_unlock_op(sbi);
 598         f2fs_alloc_nid_done(sbi, inode->i_ino);
 599
 600         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 601         if (err)
 602                 goto err_out;
 603
 604         err = page_symlink(inode, disk_link.name, disk_link.len);
 605
 606 err_out:
 607         d_instantiate(dentry, inode);
 608         unlock_new_inode(inode);
 609
 610         /*
 611          * Let's flush symlink data in order to avoid broken symlink as much as
 612          * possible. Nevertheless, fsyncing is the best way, but there is no
 613          * way to get a file descriptor in order to flush that.
 614          *
 615          * Note that, it needs to do dir->fsync to make this recoverable.
 616          * If the symlink path is stored into inline_data, there is no
 617          * performance regression.
 618          */
 619         if (!err) {
 620                 filemap_write_and_wait_range(inode->i_mapping, 0,
 621                                                         disk_link.len - 1);
 622
 623                 if (IS_DIRSYNC(dir))
 624                         f2fs_sync_fs(sbi->sb, 1);
 625         } else {
 626                 f2fs_unlink(dir, dentry);
 627         }
 628
 629         f2fs_balance_fs(sbi, true);
 630         goto out_free_encrypted_link;
 631
 632 out_f2fs_handle_failed_inode:
 633         f2fs_handle_failed_inode(inode);
 634 out_free_encrypted_link:
 635         if (disk_link.name != (unsigned char *)symname)
 636                 kvfree(disk_link.name);
 637         return err;
 638 }
 639
 640 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 641 {
 642         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 643         struct inode *inode;
 644         int err;
 645
 646         if (unlikely(f2fs_cp_error(sbi)))
 647                 return -EIO;
 648
 649         err = dquot_initialize(dir);
 650         if (err)
 651                 return err;
 652
 653         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 654         if (IS_ERR(inode))
 655                 return PTR_ERR(inode);
 656
 657         inode->i_op = &f2fs_dir_inode_operations;
 658         inode->i_fop = &f2fs_dir_operations;
 659         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 660         inode_nohighmem(inode);
 661
 662         set_inode_flag(inode, FI_INC_LINK);
 663         f2fs_lock_op(sbi);
 664         err = f2fs_add_link(dentry, inode);
 665         if (err)
 666                 goto out_fail;
 667         f2fs_unlock_op(sbi);
 668
 669         f2fs_alloc_nid_done(sbi, inode->i_ino);
 670
 671         d_instantiate(dentry, inode);
 672         unlock_new_inode(inode);
 673
 674         if (IS_DIRSYNC(dir))
 675                 f2fs_sync_fs(sbi->sb, 1);
 676
 677         f2fs_balance_fs(sbi, true);
 678         return 0;
 679
 680 out_fail:
 681         clear_inode_flag(inode, FI_INC_LINK);
 682         f2fs_handle_failed_inode(inode);
 683         return err;
 684 }
 685
 686 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 687 {
 688         struct inode *inode = d_inode(dentry);
 689         if (f2fs_empty_dir(inode))
 690                 return f2fs_unlink(dir, dentry);
 691         return -ENOTEMPTY;
 692 }
 693
 694 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 695                                 umode_t mode, dev_t rdev)
 696 {
 697         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 698         struct inode *inode;
 699         int err = 0;
 700
 701         if (unlikely(f2fs_cp_error(sbi)))
 702                 return -EIO;
 703         err = f2fs_is_checkpoint_ready(sbi);
 704         if (err)
 705                 return err;
 706
 707         err = dquot_initialize(dir);
 708         if (err)
 709                 return err;
 710
 711         inode = f2fs_new_inode(dir, mode);
 712         if (IS_ERR(inode))
 713                 return PTR_ERR(inode);
 714
 715         init_special_inode(inode, inode->i_mode, rdev);
 716         inode->i_op = &f2fs_special_inode_operations;
 717
 718         f2fs_lock_op(sbi);
 719         err = f2fs_add_link(dentry, inode);
 720         if (err)
 721                 goto out;
 722         f2fs_unlock_op(sbi);
 723
 724         f2fs_alloc_nid_done(sbi, inode->i_ino);
 725
 726         d_instantiate(dentry, inode);
 727         unlock_new_inode(inode);
 728
 729         if (IS_DIRSYNC(dir))
 730                 f2fs_sync_fs(sbi->sb, 1);
 731
 732         f2fs_balance_fs(sbi, true);
 733         return 0;
 734 out:
 735         f2fs_handle_failed_inode(inode);
 736         return err;
 737 }
 738
 739 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 740                                         umode_t mode, struct inode **whiteout)
 741 {
 742         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 743         struct inode *inode;
 744         int err;
 745
 746         err = dquot_initialize(dir);
 747         if (err)
 748                 return err;
 749
 750         inode = f2fs_new_inode(dir, mode);
 751         if (IS_ERR(inode))
 752                 return PTR_ERR(inode);
 753
 754         if (whiteout) {
 755                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 756                 inode->i_op = &f2fs_special_inode_operations;
 757         } else {
 758                 inode->i_op = &f2fs_file_inode_operations;
 759                 inode->i_fop = &f2fs_file_operations;
 760                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 761         }
 762
 763         f2fs_lock_op(sbi);
 764         err = f2fs_acquire_orphan_inode(sbi);
 765         if (err)
 766                 goto out;
 767
 768         err = f2fs_do_tmpfile(inode, dir);
 769         if (err)
 770                 goto release_out;
 771
 772         /*
 773          * add this non-linked tmpfile to orphan list, in this way we could
 774          * remove all unused data of tmpfile after abnormal power-off.
 775          */
 776         f2fs_add_orphan_inode(inode);
 777         f2fs_alloc_nid_done(sbi, inode->i_ino);
 778
 779         if (whiteout) {
 780                 f2fs_i_links_write(inode, false);
 781                 *whiteout = inode;
 782         } else {
 783                 d_tmpfile(dentry, inode);
 784         }
 785         /* link_count was changed by d_tmpfile as well. */
 786         f2fs_unlock_op(sbi);
 787         unlock_new_inode(inode);
 788
 789         f2fs_balance_fs(sbi, true);
 790         return 0;
 791
 792 release_out:
 793         f2fs_release_orphan_inode(sbi);
 794 out:
 795         f2fs_handle_failed_inode(inode);
 796         return err;
 797 }
 798
 799 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 800 {
 801         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 802
 803         if (unlikely(f2fs_cp_error(sbi)))
 804                 return -EIO;
 805
 806         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 807                 int err = fscrypt_get_encryption_info(dir);
 808                 if (err)
 809                         return err;
 810         }
 811
 812         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 813 }
 814
 815 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 816 {
 817         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 818                 return -EIO;
 819
 820         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 821 }
 822
 823 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 824                         struct inode *new_dir, struct dentry *new_dentry,
 825                         unsigned int flags)
 826 {
 827         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 828         struct inode *old_inode = d_inode(old_dentry);
 829         struct inode *new_inode = d_inode(new_dentry);
 830         struct inode *whiteout = NULL;
 831         struct page *old_dir_page;
 832         struct page *old_page, *new_page = NULL;
 833         struct f2fs_dir_entry *old_dir_entry = NULL;
 834         struct f2fs_dir_entry *old_entry;
 835         struct f2fs_dir_entry *new_entry;
 836         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 837         int err;
 838
 839         if (unlikely(f2fs_cp_error(sbi)))
 840                 return -EIO;
 841         err = f2fs_is_checkpoint_ready(sbi);
 842         if (err)
 843                 return err;
 844
 845         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 846                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 847                         F2FS_I(old_dentry->d_inode)->i_projid)))
 848                 return -EXDEV;
 849
 850         err = dquot_initialize(old_dir);
 851         if (err)
 852                 goto out;
 853
 854         err = dquot_initialize(new_dir);
 855         if (err)
 856                 goto out;
 857
 858         if (new_inode) {
 859                 err = dquot_initialize(new_inode);
 860                 if (err)
 861                         goto out;
 862         }
 863
 864         err = -ENOENT;
 865         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 866         if (!old_entry) {
 867                 if (IS_ERR(old_page))
 868                         err = PTR_ERR(old_page);
 869                 goto out;
 870         }
 871
 872         if (S_ISDIR(old_inode->i_mode)) {
 873                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 874                 if (!old_dir_entry) {
 875                         if (IS_ERR(old_dir_page))
 876                                 err = PTR_ERR(old_dir_page);
 877                         goto out_old;
 878                 }
 879         }
 880
 881         if (flags & RENAME_WHITEOUT) {
 882                 err = f2fs_create_whiteout(old_dir, &whiteout);
 883                 if (err)
 884                         goto out_dir;
 885         }
 886
 887         if (new_inode) {
 888
 889                 err = -ENOTEMPTY;
 890                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 891                         goto out_whiteout;
 892
 893                 err = -ENOENT;
 894                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 895                                                 &new_page);
 896                 if (!new_entry) {
 897                         if (IS_ERR(new_page))
 898                                 err = PTR_ERR(new_page);
 899                         goto out_whiteout;
 900                 }
 901
 902                 f2fs_balance_fs(sbi, true);
 903
 904                 f2fs_lock_op(sbi);
 905
 906                 err = f2fs_acquire_orphan_inode(sbi);
 907                 if (err)
 908                         goto put_out_dir;
 909
 910                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 911
 912                 new_inode->i_ctime = current_time(new_inode);
 913                 down_write(&F2FS_I(new_inode)->i_sem);
 914                 if (old_dir_entry)
 915                         f2fs_i_links_write(new_inode, false);
 916                 f2fs_i_links_write(new_inode, false);
 917                 up_write(&F2FS_I(new_inode)->i_sem);
 918
 919                 if (!new_inode->i_nlink)
 920                         f2fs_add_orphan_inode(new_inode);
 921                 else
 922                         f2fs_release_orphan_inode(sbi);
 923         } else {
 924                 f2fs_balance_fs(sbi, true);
 925
 926                 f2fs_lock_op(sbi);
 927
 928                 err = f2fs_add_link(new_dentry, old_inode);
 929                 if (err) {
 930                         f2fs_unlock_op(sbi);
 931                         goto out_whiteout;
 932                 }
 933
 934                 if (old_dir_entry)
 935                         f2fs_i_links_write(new_dir, true);
 936
 937                 /*
 938                  * old entry and new entry can locate in the same inline
 939                  * dentry in inode, when attaching new entry in inline dentry,
 940                  * it could force inline dentry conversion, after that,
 941                  * old_entry and old_page will point to wrong address, in
 942                  * order to avoid this, let's do the check and update here.
 943                  */
 944                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 945                         f2fs_put_page(old_page, 0);
 946                         old_page = NULL;
 947
 948                         old_entry = f2fs_find_entry(old_dir,
 949                                                 &old_dentry->d_name, &old_page);
 950                         if (!old_entry) {
 951                                 err = -ENOENT;
 952                                 if (IS_ERR(old_page))
 953                                         err = PTR_ERR(old_page);
 954                                 f2fs_unlock_op(sbi);
 955                                 goto out_whiteout;
 956                         }
 957                 }
 958         }
 959
 960         down_write(&F2FS_I(old_inode)->i_sem);
 961         if (!old_dir_entry || whiteout)
 962                 file_lost_pino(old_inode);
 963         else
 964                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 965         up_write(&F2FS_I(old_inode)->i_sem);
 966
 967         old_inode->i_ctime = current_time(old_inode);
 968         f2fs_mark_inode_dirty_sync(old_inode, false);
 969
 970         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 971
 972         if (whiteout) {
 973                 whiteout->i_state |= I_LINKABLE;
 974                 set_inode_flag(whiteout, FI_INC_LINK);
 975                 err = f2fs_add_link(old_dentry, whiteout);
 976                 if (err)
 977                         goto put_out_dir;
 978                 whiteout->i_state &= ~I_LINKABLE;
 979                 iput(whiteout);
 980         }
 981
 982         if (old_dir_entry) {
 983                 if (old_dir != new_dir && !whiteout)
 984                         f2fs_set_link(old_inode, old_dir_entry,
 985                                                 old_dir_page, new_dir);
 986                 else
 987                         f2fs_put_page(old_dir_page, 0);
 988                 f2fs_i_links_write(old_dir, false);
 989         }
 990         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 991                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 992                 if (S_ISDIR(old_inode->i_mode))
 993                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
 994                                                         TRANS_DIR_INO);
 995         }
 996
 997         f2fs_unlock_op(sbi);
 998
 999         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1000                 f2fs_sync_fs(sbi->sb, 1);
1001
1002         f2fs_update_time(sbi, REQ_TIME);
1003         return 0;
1004
1005 put_out_dir:
1006         f2fs_unlock_op(sbi);
1007         if (new_page)
1008                 f2fs_put_page(new_page, 0);
1009 out_whiteout:
1010         if (whiteout)
1011                 iput(whiteout);
1012 out_dir:
1013         if (old_dir_entry)
1014                 f2fs_put_page(old_dir_page, 0);
1015 out_old:
1016         f2fs_put_page(old_page, 0);
1017 out:
1018         return err;
1019 }
1020
1021 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1022                              struct inode *new_dir, struct dentry *new_dentry)
1023 {
1024         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1025         struct inode *old_inode = d_inode(old_dentry);
1026         struct inode *new_inode = d_inode(new_dentry);
1027         struct page *old_dir_page, *new_dir_page;
1028         struct page *old_page, *new_page;
1029         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1030         struct f2fs_dir_entry *old_entry, *new_entry;
1031         int old_nlink = 0, new_nlink = 0;
1032         int err;
1033
1034         if (unlikely(f2fs_cp_error(sbi)))
1035                 return -EIO;
1036         err = f2fs_is_checkpoint_ready(sbi);
1037         if (err)
1038                 return err;
1039
1040         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1041                         !projid_eq(F2FS_I(new_dir)->i_projid,
1042                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1043             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1044                         !projid_eq(F2FS_I(old_dir)->i_projid,
1045                         F2FS_I(new_dentry->d_inode)->i_projid)))
1046                 return -EXDEV;
1047
1048         err = dquot_initialize(old_dir);
1049         if (err)
1050                 goto out;
1051
1052         err = dquot_initialize(new_dir);
1053         if (err)
1054                 goto out;
1055
1056         err = -ENOENT;
1057         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1058         if (!old_entry) {
1059                 if (IS_ERR(old_page))
1060                         err = PTR_ERR(old_page);
1061                 goto out;
1062         }
1063
1064         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1065         if (!new_entry) {
1066                 if (IS_ERR(new_page))
1067                         err = PTR_ERR(new_page);
1068                 goto out_old;
1069         }
1070
1071         /* prepare for updating ".." directory entry info later */
1072         if (old_dir != new_dir) {
1073                 if (S_ISDIR(old_inode->i_mode)) {
1074                         old_dir_entry = f2fs_parent_dir(old_inode,
1075                                                         &old_dir_page);
1076                         if (!old_dir_entry) {
1077                                 if (IS_ERR(old_dir_page))
1078                                         err = PTR_ERR(old_dir_page);
1079                                 goto out_new;
1080                         }
1081                 }
1082
1083                 if (S_ISDIR(new_inode->i_mode)) {
1084                         new_dir_entry = f2fs_parent_dir(new_inode,
1085                                                         &new_dir_page);
1086                         if (!new_dir_entry) {
1087                                 if (IS_ERR(new_dir_page))
1088                                         err = PTR_ERR(new_dir_page);
1089                                 goto out_old_dir;
1090                         }
1091                 }
1092         }
1093
1094         /*
1095          * If cross rename between file and directory those are not
1096          * in the same directory, we will inc nlink of file's parent
1097          * later, so we should check upper boundary of its nlink.
1098          */
1099         if ((!old_dir_entry || !new_dir_entry) &&
1100                                 old_dir_entry != new_dir_entry) {
1101                 old_nlink = old_dir_entry ? -1 : 1;
1102                 new_nlink = -old_nlink;
1103                 err = -EMLINK;
1104                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1105                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1106                         goto out_new_dir;
1107         }
1108
1109         f2fs_balance_fs(sbi, true);
1110
1111         f2fs_lock_op(sbi);
1112
1113         /* update ".." directory entry info of old dentry */
1114         if (old_dir_entry)
1115                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1116
1117         /* update ".." directory entry info of new dentry */
1118         if (new_dir_entry)
1119                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1120
1121         /* update directory entry info of old dir inode */
1122         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1123
1124         down_write(&F2FS_I(old_inode)->i_sem);
1125         file_lost_pino(old_inode);
1126         up_write(&F2FS_I(old_inode)->i_sem);
1127
1128         old_dir->i_ctime = current_time(old_dir);
1129         if (old_nlink) {
1130                 down_write(&F2FS_I(old_dir)->i_sem);
1131                 f2fs_i_links_write(old_dir, old_nlink > 0);
1132                 up_write(&F2FS_I(old_dir)->i_sem);
1133         }
1134         f2fs_mark_inode_dirty_sync(old_dir, false);
1135
1136         /* update directory entry info of new dir inode */
1137         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1138
1139         down_write(&F2FS_I(new_inode)->i_sem);
1140         file_lost_pino(new_inode);
1141         up_write(&F2FS_I(new_inode)->i_sem);
1142
1143         new_dir->i_ctime = current_time(new_dir);
1144         if (new_nlink) {
1145                 down_write(&F2FS_I(new_dir)->i_sem);
1146                 f2fs_i_links_write(new_dir, new_nlink > 0);
1147                 up_write(&F2FS_I(new_dir)->i_sem);
1148         }
1149         f2fs_mark_inode_dirty_sync(new_dir, false);
1150
1151         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1152                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1153                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1154         }
1155
1156         f2fs_unlock_op(sbi);
1157
1158         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1159                 f2fs_sync_fs(sbi->sb, 1);
1160
1161         f2fs_update_time(sbi, REQ_TIME);
1162         return 0;
1163 out_new_dir:
1164         if (new_dir_entry) {
1165                 f2fs_put_page(new_dir_page, 0);
1166         }
1167 out_old_dir:
1168         if (old_dir_entry) {
1169                 f2fs_put_page(old_dir_page, 0);
1170         }
1171 out_new:
1172         f2fs_put_page(new_page, 0);
1173 out_old:
1174         f2fs_put_page(old_page, 0);
1175 out:
1176         return err;
1177 }
1178
1179 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1180                         struct inode *new_dir, struct dentry *new_dentry,
1181                         unsigned int flags)
1182 {
1183         int err;
1184
1185         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1186                 return -EINVAL;
1187
1188         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1189                                      flags);
1190         if (err)
1191                 return err;
1192
1193         if (flags & RENAME_EXCHANGE) {
1194                 return f2fs_cross_rename(old_dir, old_dentry,
1195                                          new_dir, new_dentry);
1196         }
1197         /*
1198          * VFS has already handled the new dentry existence case,
1199          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1200          */
1201         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1202 }
1203
1204 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1205 {
1206         struct inode *inode = d_inode(dentry);
1207         struct page *page;
1208         void *target;
1209
1210         if (!dentry)
1211                 return ERR_PTR(-ECHILD);
1212
1213         page = read_mapping_page(inode->i_mapping, 0, NULL);
1214         if (IS_ERR(page))
1215                 return ERR_CAST(page);
1216
1217         target = fscrypt_get_symlink(inode, page_address(page),
1218                                      inode->i_sb->s_blocksize);
1219         put_page(page);
1220         return *cookie = target;
1221 }
1222
1223 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1224         .readlink       = generic_readlink,
1225         .follow_link    = f2fs_encrypted_follow_link,
1226         .put_link       = kfree_put_link,
1227         .getattr        = f2fs_getattr,
1228         .setattr        = f2fs_setattr,
1229 #ifdef CONFIG_F2FS_FS_XATTR
1230         .setxattr       = generic_setxattr,
1231         .getxattr       = generic_getxattr,
1232         .listxattr      = f2fs_listxattr,
1233         .removexattr    = generic_removexattr,
1234 #endif
1235 };
1236
1237 const struct inode_operations f2fs_dir_inode_operations = {
1238         .create         = f2fs_create,
1239         .lookup         = f2fs_lookup,
1240         .link           = f2fs_link,
1241         .unlink         = f2fs_unlink,
1242         .symlink        = f2fs_symlink,
1243         .mkdir          = f2fs_mkdir,
1244         .rmdir          = f2fs_rmdir,
1245         .mknod          = f2fs_mknod,
1246         .rename2        = f2fs_rename2,
1247         .tmpfile        = f2fs_tmpfile,
1248         .getattr        = f2fs_getattr,
1249         .setattr        = f2fs_setattr,
1250         .get_acl        = f2fs_get_acl,
1251         .set_acl        = f2fs_set_acl,
1252 #ifdef CONFIG_F2FS_FS_XATTR
1253         .setxattr       = generic_setxattr,
1254         .getxattr       = generic_getxattr,
1255         .listxattr      = f2fs_listxattr,
1256         .removexattr    = generic_removexattr,
1257 #endif
1258 };
1259
1260 const struct inode_operations f2fs_symlink_inode_operations = {
1261         .readlink       = generic_readlink,
1262         .follow_link    = f2fs_follow_link,
1263         .put_link       = page_put_link,
1264         .getattr        = f2fs_getattr,
1265         .setattr        = f2fs_setattr,
1266 #ifdef CONFIG_F2FS_FS_XATTR
1267         .setxattr       = generic_setxattr,
1268         .getxattr       = generic_getxattr,
1269         .listxattr      = f2fs_listxattr,
1270         .removexattr    = generic_removexattr,
1271 #endif
1272 };
1273
1274 const struct inode_operations f2fs_special_inode_operations = {
1275         .getattr        = f2fs_getattr,
1276         .setattr        = f2fs_setattr,
1277         .get_acl        = f2fs_get_acl,
1278         .set_acl        = f2fs_set_acl,
1279 #ifdef CONFIG_F2FS_FS_XATTR
1280         .setxattr       = generic_setxattr,
1281         .getxattr       = generic_getxattr,
1282         .listxattr      = f2fs_listxattr,
1283         .removexattr    = generic_removexattr,
1284 #endif
1285 };