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/dcache.h>
  14 #include <linux/namei.h>
  15 #include <linux/quotaops.h>
  16
  17 #include "f2fs.h"
  18 #include "node.h"
  19 #include "segment.h"
  20 #include "xattr.h"
  21 #include "acl.h"
  22 #include <trace/events/f2fs.h>
  23
  24 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  25 {
  26         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  27         nid_t ino;
  28         struct inode *inode;
  29         bool nid_free = false;
  30         int xattr_size = 0;
  31         int err;
  32
  33         inode = new_inode(dir->i_sb);
  34         if (!inode)
  35                 return ERR_PTR(-ENOMEM);
  36
  37         f2fs_lock_op(sbi);
  38         if (!f2fs_alloc_nid(sbi, &ino)) {
  39                 f2fs_unlock_op(sbi);
  40                 err = -ENOSPC;
  41                 goto fail;
  42         }
  43         f2fs_unlock_op(sbi);
  44
  45         nid_free = true;
  46
  47         inode_init_owner(inode, dir, mode);
  48
  49         inode->i_ino = ino;
  50         inode->i_blocks = 0;
  51         inode->i_mtime = inode->i_atime = inode->i_ctime =
  52                         F2FS_I(inode)->i_crtime = current_time(inode);
  53         inode->i_generation = sbi->s_next_generation++;
  54
  55         if (S_ISDIR(inode->i_mode))
  56                 F2FS_I(inode)->i_current_depth = 1;
  57
  58         err = insert_inode_locked(inode);
  59         if (err) {
  60                 err = -EINVAL;
  61                 goto fail;
  62         }
  63
  64         if (f2fs_sb_has_project_quota(sbi->sb) &&
  65                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
  66                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  67         else
  68                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  69                                                         F2FS_DEF_PROJID);
  70
  71         err = dquot_initialize(inode);
  72         if (err)
  73                 goto fail_drop;
  74
  75         set_inode_flag(inode, FI_NEW_INODE);
  76
  77         /* If the directory encrypted, then we should encrypt the inode. */
  78         if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
  79                                 f2fs_may_encrypt(inode))
  80                 f2fs_set_encrypted_inode(inode);
  81
  82         if (f2fs_sb_has_extra_attr(sbi->sb)) {
  83                 set_inode_flag(inode, FI_EXTRA_ATTR);
  84                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  85         }
  86
  87         if (test_opt(sbi, INLINE_XATTR))
  88                 set_inode_flag(inode, FI_INLINE_XATTR);
  89
  90         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  91                 set_inode_flag(inode, FI_INLINE_DATA);
  92         if (f2fs_may_inline_dentry(inode))
  93                 set_inode_flag(inode, FI_INLINE_DENTRY);
  94
  95         if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
  96                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
  97                 if (f2fs_has_inline_xattr(inode))
  98                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
  99                 /* Otherwise, will be 0 */
 100         } else if (f2fs_has_inline_xattr(inode) ||
 101                                 f2fs_has_inline_dentry(inode)) {
 102                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 103         }
 104         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 105
 106         f2fs_init_extent_tree(inode, NULL);
 107
 108         stat_inc_inline_xattr(inode);
 109         stat_inc_inline_inode(inode);
 110         stat_inc_inline_dir(inode);
 111
 112         F2FS_I(inode)->i_flags =
 113                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 114
 115         if (S_ISDIR(inode->i_mode))
 116                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
 117
 118         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
 119                 set_inode_flag(inode, FI_PROJ_INHERIT);
 120
 121         f2fs_set_inode_flags(inode);
 122
 123         trace_f2fs_new_inode(inode, 0);
 124         return inode;
 125
 126 fail:
 127         trace_f2fs_new_inode(inode, err);
 128         make_bad_inode(inode);
 129         if (nid_free)
 130                 set_inode_flag(inode, FI_FREE_NID);
 131         iput(inode);
 132         return ERR_PTR(err);
 133 fail_drop:
 134         trace_f2fs_new_inode(inode, err);
 135         dquot_drop(inode);
 136         inode->i_flags |= S_NOQUOTA;
 137         if (nid_free)
 138                 set_inode_flag(inode, FI_FREE_NID);
 139         clear_nlink(inode);
 140         unlock_new_inode(inode);
 141         iput(inode);
 142         return ERR_PTR(err);
 143 }
 144
 145 static int is_extension_exist(const unsigned char *s, const char *sub)
 146 {
 147         size_t slen = strlen(s);
 148         size_t sublen = strlen(sub);
 149         int i;
 150
 151         /*
 152          * filename format of multimedia file should be defined as:
 153          * "filename + '.' + extension + (optional: '.' + temp extension)".
 154          */
 155         if (slen < sublen + 2)
 156                 return 0;
 157
 158         for (i = 1; i < slen - sublen; i++) {
 159                 if (s[i] != '.')
 160                         continue;
 161                 if (!strncasecmp(s + i + 1, sub, sublen))
 162                         return 1;
 163         }
 164
 165         return 0;
 166 }
 167
 168 /*
 169  * Set multimedia files as cold files for hot/cold data separation
 170  */
 171 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 172                 const unsigned char *name)
 173 {
 174         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 175         int i, cold_count, hot_count;
 176
 177         down_read(&sbi->sb_lock);
 178
 179         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 180         hot_count = sbi->raw_super->hot_ext_count;
 181
 182         for (i = 0; i < cold_count + hot_count; i++) {
 183                 if (is_extension_exist(name, extlist[i]))
 184                         break;
 185         }
 186
 187         up_read(&sbi->sb_lock);
 188
 189         if (i == cold_count + hot_count)
 190                 return;
 191
 192         if (i < cold_count)
 193                 file_set_cold(inode);
 194         else
 195                 file_set_hot(inode);
 196 }
 197
 198 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 199                                                         bool hot, bool set)
 200 {
 201         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 202         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 203         int hot_count = sbi->raw_super->hot_ext_count;
 204         int total_count = cold_count + hot_count;
 205         int start, count;
 206         int i;
 207
 208         if (set) {
 209                 if (total_count == F2FS_MAX_EXTENSION)
 210                         return -EINVAL;
 211         } else {
 212                 if (!hot && !cold_count)
 213                         return -EINVAL;
 214                 if (hot && !hot_count)
 215                         return -EINVAL;
 216         }
 217
 218         if (hot) {
 219                 start = cold_count;
 220                 count = total_count;
 221         } else {
 222                 start = 0;
 223                 count = cold_count;
 224         }
 225
 226         for (i = start; i < count; i++) {
 227                 if (strcmp(name, extlist[i]))
 228                         continue;
 229
 230                 if (set)
 231                         return -EINVAL;
 232
 233                 memcpy(extlist[i], extlist[i + 1],
 234                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 235                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 236                 if (hot)
 237                         sbi->raw_super->hot_ext_count = hot_count - 1;
 238                 else
 239                         sbi->raw_super->extension_count =
 240                                                 cpu_to_le32(cold_count - 1);
 241                 return 0;
 242         }
 243
 244         if (!set)
 245                 return -EINVAL;
 246
 247         if (hot) {
 248                 memcpy(extlist[count], name, strlen(name));
 249                 sbi->raw_super->hot_ext_count = hot_count + 1;
 250         } else {
 251                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 252
 253                 memcpy(buf, &extlist[cold_count],
 254                                 F2FS_EXTENSION_LEN * hot_count);
 255                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 256                 memcpy(extlist[cold_count], name, strlen(name));
 257                 memcpy(&extlist[cold_count + 1], buf,
 258                                 F2FS_EXTENSION_LEN * hot_count);
 259                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 260         }
 261         return 0;
 262 }
 263
 264 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 265                                                 bool excl)
 266 {
 267         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 268         struct inode *inode;
 269         nid_t ino = 0;
 270         int err;
 271
 272         if (unlikely(f2fs_cp_error(sbi)))
 273                 return -EIO;
 274         err = f2fs_is_checkpoint_ready(sbi);
 275         if (err)
 276                 return err;
 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         err = f2fs_is_checkpoint_ready(sbi);
 324         if (err)
 325                 return err;
 326
 327         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 328         if (err)
 329                 return err;
 330
 331         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 332                         (!projid_eq(F2FS_I(dir)->i_projid,
 333                         F2FS_I(old_dentry->d_inode)->i_projid)))
 334                 return -EXDEV;
 335
 336         err = dquot_initialize(dir);
 337         if (err)
 338                 return err;
 339
 340         f2fs_balance_fs(sbi, true);
 341
 342         inode->i_ctime = current_time(inode);
 343         ihold(inode);
 344
 345         set_inode_flag(inode, FI_INC_LINK);
 346         f2fs_lock_op(sbi);
 347         err = f2fs_add_link(dentry, inode);
 348         if (err)
 349                 goto out;
 350         f2fs_unlock_op(sbi);
 351
 352         d_instantiate(dentry, inode);
 353
 354         if (IS_DIRSYNC(dir))
 355                 f2fs_sync_fs(sbi->sb, 1);
 356         return 0;
 357 out:
 358         clear_inode_flag(inode, FI_INC_LINK);
 359         iput(inode);
 360         f2fs_unlock_op(sbi);
 361         return err;
 362 }
 363
 364 struct dentry *f2fs_get_parent(struct dentry *child)
 365 {
 366         struct qstr dotdot = QSTR_INIT("..", 2);
 367         struct page *page;
 368         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 369         if (!ino) {
 370                 if (IS_ERR(page))
 371                         return ERR_CAST(page);
 372                 return ERR_PTR(-ENOENT);
 373         }
 374         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 375 }
 376
 377 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 378 {
 379         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 380         struct qstr dot = QSTR_INIT(".", 1);
 381         struct qstr dotdot = QSTR_INIT("..", 2);
 382         struct f2fs_dir_entry *de;
 383         struct page *page;
 384         int err = 0;
 385
 386         if (f2fs_readonly(sbi->sb)) {
 387                 f2fs_msg(sbi->sb, KERN_INFO,
 388                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 389                         "in readonly mountpoint", dir->i_ino, pino);
 390                 return 0;
 391         }
 392
 393         err = dquot_initialize(dir);
 394         if (err)
 395                 return err;
 396
 397         f2fs_balance_fs(sbi, true);
 398
 399         f2fs_lock_op(sbi);
 400
 401         de = f2fs_find_entry(dir, &dot, &page);
 402         if (de) {
 403                 f2fs_put_page(page, 0);
 404         } else if (IS_ERR(page)) {
 405                 err = PTR_ERR(page);
 406                 goto out;
 407         } else {
 408                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 409                 if (err)
 410                         goto out;
 411         }
 412
 413         de = f2fs_find_entry(dir, &dotdot, &page);
 414         if (de)
 415                 f2fs_put_page(page, 0);
 416         else if (IS_ERR(page))
 417                 err = PTR_ERR(page);
 418         else
 419                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 420 out:
 421         if (!err)
 422                 clear_inode_flag(dir, FI_INLINE_DOTS);
 423
 424         f2fs_unlock_op(sbi);
 425         return err;
 426 }
 427
 428 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 429                 unsigned int flags)
 430 {
 431         struct inode *inode = NULL;
 432         struct f2fs_dir_entry *de;
 433         struct page *page;
 434         struct dentry *new;
 435         nid_t ino = -1;
 436         int err = 0;
 437         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 438
 439         trace_f2fs_lookup_start(dir, dentry, flags);
 440
 441         err = fscrypt_prepare_lookup(dir, dentry, flags);
 442         if (err)
 443                 goto out;
 444
 445         if (dentry->d_name.len > F2FS_NAME_LEN) {
 446                 err = -ENAMETOOLONG;
 447                 goto out;
 448         }
 449
 450         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 451         if (!de) {
 452                 if (IS_ERR(page)) {
 453                         err = PTR_ERR(page);
 454                         goto out;
 455                 }
 456                 goto out_splice;
 457         }
 458
 459         ino = le32_to_cpu(de->ino);
 460         f2fs_put_page(page, 0);
 461
 462         inode = f2fs_iget(dir->i_sb, ino);
 463         if (IS_ERR(inode)) {
 464                 err = PTR_ERR(inode);
 465                 goto out;
 466         }
 467
 468         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 469                 err = __recover_dot_dentries(dir, root_ino);
 470                 if (err)
 471                         goto out_iput;
 472         }
 473
 474         if (f2fs_has_inline_dots(inode)) {
 475                 err = __recover_dot_dentries(inode, dir->i_ino);
 476                 if (err)
 477                         goto out_iput;
 478         }
 479         if (f2fs_encrypted_inode(dir) &&
 480             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 481             !fscrypt_has_permitted_context(dir, inode)) {
 482                 f2fs_msg(inode->i_sb, KERN_WARNING,
 483                          "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_new(dentry, inode);
 608
 609         /*
 610          * Let's flush symlink data in order to avoid broken symlink as much as
 611          * possible. Nevertheless, fsyncing is the best way, but there is no
 612          * way to get a file descriptor in order to flush that.
 613          *
 614          * Note that, it needs to do dir->fsync to make this recoverable.
 615          * If the symlink path is stored into inline_data, there is no
 616          * performance regression.
 617          */
 618         if (!err) {
 619                 filemap_write_and_wait_range(inode->i_mapping, 0,
 620                                                         disk_link.len - 1);
 621
 622                 if (IS_DIRSYNC(dir))
 623                         f2fs_sync_fs(sbi->sb, 1);
 624         } else {
 625                 f2fs_unlink(dir, dentry);
 626         }
 627
 628         f2fs_balance_fs(sbi, true);
 629         goto out_free_encrypted_link;
 630
 631 out_f2fs_handle_failed_inode:
 632         f2fs_handle_failed_inode(inode);
 633 out_free_encrypted_link:
 634         if (disk_link.name != (unsigned char *)symname)
 635                 kfree(disk_link.name);
 636         return err;
 637 }
 638
 639 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 640 {
 641         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 642         struct inode *inode;
 643         int err;
 644
 645         if (unlikely(f2fs_cp_error(sbi)))
 646                 return -EIO;
 647
 648         err = dquot_initialize(dir);
 649         if (err)
 650                 return err;
 651
 652         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 653         if (IS_ERR(inode))
 654                 return PTR_ERR(inode);
 655
 656         inode->i_op = &f2fs_dir_inode_operations;
 657         inode->i_fop = &f2fs_dir_operations;
 658         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 659         inode_nohighmem(inode);
 660
 661         set_inode_flag(inode, FI_INC_LINK);
 662         f2fs_lock_op(sbi);
 663         err = f2fs_add_link(dentry, inode);
 664         if (err)
 665                 goto out_fail;
 666         f2fs_unlock_op(sbi);
 667
 668         f2fs_alloc_nid_done(sbi, inode->i_ino);
 669
 670         d_instantiate_new(dentry, inode);
 671
 672         if (IS_DIRSYNC(dir))
 673                 f2fs_sync_fs(sbi->sb, 1);
 674
 675         f2fs_balance_fs(sbi, true);
 676         return 0;
 677
 678 out_fail:
 679         clear_inode_flag(inode, FI_INC_LINK);
 680         f2fs_handle_failed_inode(inode);
 681         return err;
 682 }
 683
 684 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 685 {
 686         struct inode *inode = d_inode(dentry);
 687         if (f2fs_empty_dir(inode))
 688                 return f2fs_unlink(dir, dentry);
 689         return -ENOTEMPTY;
 690 }
 691
 692 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 693                                 umode_t mode, dev_t rdev)
 694 {
 695         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 696         struct inode *inode;
 697         int err = 0;
 698
 699         if (unlikely(f2fs_cp_error(sbi)))
 700                 return -EIO;
 701         err = f2fs_is_checkpoint_ready(sbi);
 702         if (err)
 703                 return err;
 704
 705         err = dquot_initialize(dir);
 706         if (err)
 707                 return err;
 708
 709         inode = f2fs_new_inode(dir, mode);
 710         if (IS_ERR(inode))
 711                 return PTR_ERR(inode);
 712
 713         init_special_inode(inode, inode->i_mode, rdev);
 714         inode->i_op = &f2fs_special_inode_operations;
 715
 716         f2fs_lock_op(sbi);
 717         err = f2fs_add_link(dentry, inode);
 718         if (err)
 719                 goto out;
 720         f2fs_unlock_op(sbi);
 721
 722         f2fs_alloc_nid_done(sbi, inode->i_ino);
 723
 724         d_instantiate_new(dentry, inode);
 725
 726         if (IS_DIRSYNC(dir))
 727                 f2fs_sync_fs(sbi->sb, 1);
 728
 729         f2fs_balance_fs(sbi, true);
 730         return 0;
 731 out:
 732         f2fs_handle_failed_inode(inode);
 733         return err;
 734 }
 735
 736 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 737                                         umode_t mode, struct inode **whiteout)
 738 {
 739         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 740         struct inode *inode;
 741         int err;
 742
 743         err = dquot_initialize(dir);
 744         if (err)
 745                 return err;
 746
 747         inode = f2fs_new_inode(dir, mode);
 748         if (IS_ERR(inode))
 749                 return PTR_ERR(inode);
 750
 751         if (whiteout) {
 752                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 753                 inode->i_op = &f2fs_special_inode_operations;
 754         } else {
 755                 inode->i_op = &f2fs_file_inode_operations;
 756                 inode->i_fop = &f2fs_file_operations;
 757                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 758         }
 759
 760         f2fs_lock_op(sbi);
 761         err = f2fs_acquire_orphan_inode(sbi);
 762         if (err)
 763                 goto out;
 764
 765         err = f2fs_do_tmpfile(inode, dir);
 766         if (err)
 767                 goto release_out;
 768
 769         /*
 770          * add this non-linked tmpfile to orphan list, in this way we could
 771          * remove all unused data of tmpfile after abnormal power-off.
 772          */
 773         f2fs_add_orphan_inode(inode);
 774         f2fs_alloc_nid_done(sbi, inode->i_ino);
 775
 776         if (whiteout) {
 777                 f2fs_i_links_write(inode, false);
 778                 *whiteout = inode;
 779         } else {
 780                 d_tmpfile(dentry, inode);
 781         }
 782         /* link_count was changed by d_tmpfile as well. */
 783         f2fs_unlock_op(sbi);
 784         unlock_new_inode(inode);
 785
 786         f2fs_balance_fs(sbi, true);
 787         return 0;
 788
 789 release_out:
 790         f2fs_release_orphan_inode(sbi);
 791 out:
 792         f2fs_handle_failed_inode(inode);
 793         return err;
 794 }
 795
 796 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 797 {
 798         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 799
 800         if (unlikely(f2fs_cp_error(sbi)))
 801                 return -EIO;
 802
 803         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 804                 int err = fscrypt_get_encryption_info(dir);
 805                 if (err)
 806                         return err;
 807         }
 808
 809         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 810 }
 811
 812 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 813 {
 814         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 815                 return -EIO;
 816
 817         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 818 }
 819
 820 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 821                         struct inode *new_dir, struct dentry *new_dentry,
 822                         unsigned int flags)
 823 {
 824         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 825         struct inode *old_inode = d_inode(old_dentry);
 826         struct inode *new_inode = d_inode(new_dentry);
 827         struct inode *whiteout = NULL;
 828         struct page *old_dir_page;
 829         struct page *old_page, *new_page = NULL;
 830         struct f2fs_dir_entry *old_dir_entry = NULL;
 831         struct f2fs_dir_entry *old_entry;
 832         struct f2fs_dir_entry *new_entry;
 833         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 834         int err;
 835
 836         if (unlikely(f2fs_cp_error(sbi)))
 837                 return -EIO;
 838         err = f2fs_is_checkpoint_ready(sbi);
 839         if (err)
 840                 return err;
 841
 842         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 843                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 844                         F2FS_I(old_dentry->d_inode)->i_projid)))
 845                 return -EXDEV;
 846
 847         err = dquot_initialize(old_dir);
 848         if (err)
 849                 goto out;
 850
 851         err = dquot_initialize(new_dir);
 852         if (err)
 853                 goto out;
 854
 855         if (new_inode) {
 856                 err = dquot_initialize(new_inode);
 857                 if (err)
 858                         goto out;
 859         }
 860
 861         err = -ENOENT;
 862         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 863         if (!old_entry) {
 864                 if (IS_ERR(old_page))
 865                         err = PTR_ERR(old_page);
 866                 goto out;
 867         }
 868
 869         if (S_ISDIR(old_inode->i_mode)) {
 870                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 871                 if (!old_dir_entry) {
 872                         if (IS_ERR(old_dir_page))
 873                                 err = PTR_ERR(old_dir_page);
 874                         goto out_old;
 875                 }
 876         }
 877
 878         if (flags & RENAME_WHITEOUT) {
 879                 err = f2fs_create_whiteout(old_dir, &whiteout);
 880                 if (err)
 881                         goto out_dir;
 882         }
 883
 884         if (new_inode) {
 885
 886                 err = -ENOTEMPTY;
 887                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 888                         goto out_whiteout;
 889
 890                 err = -ENOENT;
 891                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 892                                                 &new_page);
 893                 if (!new_entry) {
 894                         if (IS_ERR(new_page))
 895                                 err = PTR_ERR(new_page);
 896                         goto out_whiteout;
 897                 }
 898
 899                 f2fs_balance_fs(sbi, true);
 900
 901                 f2fs_lock_op(sbi);
 902
 903                 err = f2fs_acquire_orphan_inode(sbi);
 904                 if (err)
 905                         goto put_out_dir;
 906
 907                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 908
 909                 new_inode->i_ctime = current_time(new_inode);
 910                 down_write(&F2FS_I(new_inode)->i_sem);
 911                 if (old_dir_entry)
 912                         f2fs_i_links_write(new_inode, false);
 913                 f2fs_i_links_write(new_inode, false);
 914                 up_write(&F2FS_I(new_inode)->i_sem);
 915
 916                 if (!new_inode->i_nlink)
 917                         f2fs_add_orphan_inode(new_inode);
 918                 else
 919                         f2fs_release_orphan_inode(sbi);
 920         } else {
 921                 f2fs_balance_fs(sbi, true);
 922
 923                 f2fs_lock_op(sbi);
 924
 925                 err = f2fs_add_link(new_dentry, old_inode);
 926                 if (err) {
 927                         f2fs_unlock_op(sbi);
 928                         goto out_whiteout;
 929                 }
 930
 931                 if (old_dir_entry)
 932                         f2fs_i_links_write(new_dir, true);
 933
 934                 /*
 935                  * old entry and new entry can locate in the same inline
 936                  * dentry in inode, when attaching new entry in inline dentry,
 937                  * it could force inline dentry conversion, after that,
 938                  * old_entry and old_page will point to wrong address, in
 939                  * order to avoid this, let's do the check and update here.
 940                  */
 941                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 942                         f2fs_put_page(old_page, 0);
 943                         old_page = NULL;
 944
 945                         old_entry = f2fs_find_entry(old_dir,
 946                                                 &old_dentry->d_name, &old_page);
 947                         if (!old_entry) {
 948                                 err = -ENOENT;
 949                                 if (IS_ERR(old_page))
 950                                         err = PTR_ERR(old_page);
 951                                 f2fs_unlock_op(sbi);
 952                                 goto out_whiteout;
 953                         }
 954                 }
 955         }
 956
 957         down_write(&F2FS_I(old_inode)->i_sem);
 958         if (!old_dir_entry || whiteout)
 959                 file_lost_pino(old_inode);
 960         else
 961                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 962         up_write(&F2FS_I(old_inode)->i_sem);
 963
 964         old_inode->i_ctime = current_time(old_inode);
 965         f2fs_mark_inode_dirty_sync(old_inode, false);
 966
 967         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 968
 969         if (whiteout) {
 970                 whiteout->i_state |= I_LINKABLE;
 971                 set_inode_flag(whiteout, FI_INC_LINK);
 972                 err = f2fs_add_link(old_dentry, whiteout);
 973                 if (err)
 974                         goto put_out_dir;
 975                 whiteout->i_state &= ~I_LINKABLE;
 976                 iput(whiteout);
 977         }
 978
 979         if (old_dir_entry) {
 980                 if (old_dir != new_dir && !whiteout)
 981                         f2fs_set_link(old_inode, old_dir_entry,
 982                                                 old_dir_page, new_dir);
 983                 else
 984                         f2fs_put_page(old_dir_page, 0);
 985                 f2fs_i_links_write(old_dir, false);
 986         }
 987         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 988                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 989                 if (S_ISDIR(old_inode->i_mode))
 990                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
 991                                                         TRANS_DIR_INO);
 992         }
 993
 994         f2fs_unlock_op(sbi);
 995
 996         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 997                 f2fs_sync_fs(sbi->sb, 1);
 998
 999         f2fs_update_time(sbi, REQ_TIME);
1000         return 0;
1001
1002 put_out_dir:
1003         f2fs_unlock_op(sbi);
1004         if (new_page)
1005                 f2fs_put_page(new_page, 0);
1006 out_whiteout:
1007         if (whiteout)
1008                 iput(whiteout);
1009 out_dir:
1010         if (old_dir_entry)
1011                 f2fs_put_page(old_dir_page, 0);
1012 out_old:
1013         f2fs_put_page(old_page, 0);
1014 out:
1015         return err;
1016 }
1017
1018 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1019                              struct inode *new_dir, struct dentry *new_dentry)
1020 {
1021         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1022         struct inode *old_inode = d_inode(old_dentry);
1023         struct inode *new_inode = d_inode(new_dentry);
1024         struct page *old_dir_page, *new_dir_page;
1025         struct page *old_page, *new_page;
1026         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1027         struct f2fs_dir_entry *old_entry, *new_entry;
1028         int old_nlink = 0, new_nlink = 0;
1029         int err;
1030
1031         if (unlikely(f2fs_cp_error(sbi)))
1032                 return -EIO;
1033         err = f2fs_is_checkpoint_ready(sbi);
1034         if (err)
1035                 return err;
1036
1037         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1038                         !projid_eq(F2FS_I(new_dir)->i_projid,
1039                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1040             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1041                         !projid_eq(F2FS_I(old_dir)->i_projid,
1042                         F2FS_I(new_dentry->d_inode)->i_projid)))
1043                 return -EXDEV;
1044
1045         err = dquot_initialize(old_dir);
1046         if (err)
1047                 goto out;
1048
1049         err = dquot_initialize(new_dir);
1050         if (err)
1051                 goto out;
1052
1053         err = -ENOENT;
1054         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1055         if (!old_entry) {
1056                 if (IS_ERR(old_page))
1057                         err = PTR_ERR(old_page);
1058                 goto out;
1059         }
1060
1061         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1062         if (!new_entry) {
1063                 if (IS_ERR(new_page))
1064                         err = PTR_ERR(new_page);
1065                 goto out_old;
1066         }
1067
1068         /* prepare for updating ".." directory entry info later */
1069         if (old_dir != new_dir) {
1070                 if (S_ISDIR(old_inode->i_mode)) {
1071                         old_dir_entry = f2fs_parent_dir(old_inode,
1072                                                         &old_dir_page);
1073                         if (!old_dir_entry) {
1074                                 if (IS_ERR(old_dir_page))
1075                                         err = PTR_ERR(old_dir_page);
1076                                 goto out_new;
1077                         }
1078                 }
1079
1080                 if (S_ISDIR(new_inode->i_mode)) {
1081                         new_dir_entry = f2fs_parent_dir(new_inode,
1082                                                         &new_dir_page);
1083                         if (!new_dir_entry) {
1084                                 if (IS_ERR(new_dir_page))
1085                                         err = PTR_ERR(new_dir_page);
1086                                 goto out_old_dir;
1087                         }
1088                 }
1089         }
1090
1091         /*
1092          * If cross rename between file and directory those are not
1093          * in the same directory, we will inc nlink of file's parent
1094          * later, so we should check upper boundary of its nlink.
1095          */
1096         if ((!old_dir_entry || !new_dir_entry) &&
1097                                 old_dir_entry != new_dir_entry) {
1098                 old_nlink = old_dir_entry ? -1 : 1;
1099                 new_nlink = -old_nlink;
1100                 err = -EMLINK;
1101                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1102                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1103                         goto out_new_dir;
1104         }
1105
1106         f2fs_balance_fs(sbi, true);
1107
1108         f2fs_lock_op(sbi);
1109
1110         /* update ".." directory entry info of old dentry */
1111         if (old_dir_entry)
1112                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1113
1114         /* update ".." directory entry info of new dentry */
1115         if (new_dir_entry)
1116                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1117
1118         /* update directory entry info of old dir inode */
1119         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1120
1121         down_write(&F2FS_I(old_inode)->i_sem);
1122         file_lost_pino(old_inode);
1123         up_write(&F2FS_I(old_inode)->i_sem);
1124
1125         old_dir->i_ctime = current_time(old_dir);
1126         if (old_nlink) {
1127                 down_write(&F2FS_I(old_dir)->i_sem);
1128                 f2fs_i_links_write(old_dir, old_nlink > 0);
1129                 up_write(&F2FS_I(old_dir)->i_sem);
1130         }
1131         f2fs_mark_inode_dirty_sync(old_dir, false);
1132
1133         /* update directory entry info of new dir inode */
1134         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1135
1136         down_write(&F2FS_I(new_inode)->i_sem);
1137         file_lost_pino(new_inode);
1138         up_write(&F2FS_I(new_inode)->i_sem);
1139
1140         new_dir->i_ctime = current_time(new_dir);
1141         if (new_nlink) {
1142                 down_write(&F2FS_I(new_dir)->i_sem);
1143                 f2fs_i_links_write(new_dir, new_nlink > 0);
1144                 up_write(&F2FS_I(new_dir)->i_sem);
1145         }
1146         f2fs_mark_inode_dirty_sync(new_dir, false);
1147
1148         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1149                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1150                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1151         }
1152
1153         f2fs_unlock_op(sbi);
1154
1155         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1156                 f2fs_sync_fs(sbi->sb, 1);
1157
1158         f2fs_update_time(sbi, REQ_TIME);
1159         return 0;
1160 out_new_dir:
1161         if (new_dir_entry) {
1162                 f2fs_put_page(new_dir_page, 0);
1163         }
1164 out_old_dir:
1165         if (old_dir_entry) {
1166                 f2fs_put_page(old_dir_page, 0);
1167         }
1168 out_new:
1169         f2fs_put_page(new_page, 0);
1170 out_old:
1171         f2fs_put_page(old_page, 0);
1172 out:
1173         return err;
1174 }
1175
1176 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1177                         struct inode *new_dir, struct dentry *new_dentry,
1178                         unsigned int flags)
1179 {
1180         int err;
1181
1182         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1183                 return -EINVAL;
1184
1185         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1186                                      flags);
1187         if (err)
1188                 return err;
1189
1190         if (flags & RENAME_EXCHANGE) {
1191                 return f2fs_cross_rename(old_dir, old_dentry,
1192                                          new_dir, new_dentry);
1193         }
1194         /*
1195          * VFS has already handled the new dentry existence case,
1196          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1197          */
1198         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1199 }
1200
1201 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1202 {
1203         struct inode *inode = d_inode(dentry);
1204         struct page *page;
1205         void *target;
1206
1207         if (!dentry)
1208                 return ERR_PTR(-ECHILD);
1209
1210         page = read_mapping_page(inode->i_mapping, 0, NULL);
1211         if (IS_ERR(page))
1212                 return ERR_CAST(page);
1213
1214         target = fscrypt_get_symlink(inode, page_address(page),
1215                                      inode->i_sb->s_blocksize);
1216         put_page(page);
1217         return *cookie = target;
1218 }
1219
1220 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1221         .readlink       = generic_readlink,
1222         .follow_link    = f2fs_encrypted_follow_link,
1223         .put_link       = kfree_put_link,
1224         .getattr        = f2fs_getattr,
1225         .setattr        = f2fs_setattr,
1226 #ifdef CONFIG_F2FS_FS_XATTR
1227         .setxattr       = generic_setxattr,
1228         .getxattr       = generic_getxattr,
1229         .listxattr      = f2fs_listxattr,
1230         .removexattr    = generic_removexattr,
1231 #endif
1232 };
1233
1234 const struct inode_operations f2fs_dir_inode_operations = {
1235         .create         = f2fs_create,
1236         .lookup         = f2fs_lookup,
1237         .link           = f2fs_link,
1238         .unlink         = f2fs_unlink,
1239         .symlink        = f2fs_symlink,
1240         .mkdir          = f2fs_mkdir,
1241         .rmdir          = f2fs_rmdir,
1242         .mknod          = f2fs_mknod,
1243         .rename2        = f2fs_rename2,
1244         .tmpfile        = f2fs_tmpfile,
1245         .getattr        = f2fs_getattr,
1246         .setattr        = f2fs_setattr,
1247         .get_acl        = f2fs_get_acl,
1248         .set_acl        = f2fs_set_acl,
1249 #ifdef CONFIG_F2FS_FS_XATTR
1250         .setxattr       = generic_setxattr,
1251         .getxattr       = generic_getxattr,
1252         .listxattr      = f2fs_listxattr,
1253         .removexattr    = generic_removexattr,
1254 #endif
1255 };
1256
1257 const struct inode_operations f2fs_symlink_inode_operations = {
1258         .readlink       = generic_readlink,
1259         .follow_link    = f2fs_follow_link,
1260         .put_link       = page_put_link,
1261         .getattr        = f2fs_getattr,
1262         .setattr        = f2fs_setattr,
1263 #ifdef CONFIG_F2FS_FS_XATTR
1264         .setxattr       = generic_setxattr,
1265         .getxattr       = generic_getxattr,
1266         .listxattr      = f2fs_listxattr,
1267         .removexattr    = generic_removexattr,
1268 #endif
1269 };
1270
1271 const struct inode_operations f2fs_special_inode_operations = {
1272         .getattr        = f2fs_getattr,
1273         .setattr        = f2fs_setattr,
1274         .get_acl        = f2fs_get_acl,
1275         .set_acl        = f2fs_set_acl,
1276 #ifdef CONFIG_F2FS_FS_XATTR
1277         .setxattr       = generic_setxattr,
1278         .getxattr       = generic_getxattr,
1279         .listxattr      = f2fs_listxattr,
1280         .removexattr    = generic_removexattr,
1281 #endif
1282 };