fs/f2fs/namei.c

   1 /*
   2  * fs/f2fs/namei.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13 #include <linux/pagemap.h>
  14 #include <linux/sched.h>
  15 #include <linux/ctype.h>
  16 #include <linux/dcache.h>
  17 #include <linux/namei.h>
  18 #include <linux/quotaops.h>
  19
  20 #include "f2fs.h"
  21 #include "node.h"
  22 #include "xattr.h"
  23 #include "acl.h"
  24 #include <trace/events/f2fs.h>
  25
  26 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  27 {
  28         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  29         nid_t ino;
  30         struct inode *inode;
  31         bool nid_free = false;
  32         int xattr_size = 0;
  33         int err;
  34
  35         inode = new_inode(dir->i_sb);
  36         if (!inode)
  37                 return ERR_PTR(-ENOMEM);
  38
  39         f2fs_lock_op(sbi);
  40         if (!alloc_nid(sbi, &ino)) {
  41                 f2fs_unlock_op(sbi);
  42                 err = -ENOSPC;
  43                 goto fail;
  44         }
  45         f2fs_unlock_op(sbi);
  46
  47         nid_free = true;
  48
  49         inode_init_owner(inode, dir, mode);
  50
  51         inode->i_ino = ino;
  52         inode->i_blocks = 0;
  53         inode->i_mtime = inode->i_atime = inode->i_ctime =
  54                         F2FS_I(inode)->i_crtime = current_time(inode);
  55         inode->i_generation = sbi->s_next_generation++;
  56
  57         err = insert_inode_locked(inode);
  58         if (err) {
  59                 err = -EINVAL;
  60                 goto fail;
  61         }
  62
  63         if (f2fs_sb_has_project_quota(sbi->sb) &&
  64                 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
  65                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  66         else
  67                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  68                                                         F2FS_DEF_PROJID);
  69
  70         err = dquot_initialize(inode);
  71         if (err)
  72                 goto fail_drop;
  73
  74         err = dquot_alloc_inode(inode);
  75         if (err)
  76                 goto fail_drop;
  77
  78         set_inode_flag(inode, FI_NEW_INODE);
  79
  80         /* If the directory encrypted, then we should encrypt the inode. */
  81         if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
  82                                 f2fs_may_encrypt(inode))
  83                 f2fs_set_encrypted_inode(inode);
  84
  85         if (f2fs_sb_has_extra_attr(sbi->sb)) {
  86                 set_inode_flag(inode, FI_EXTRA_ATTR);
  87                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  88         }
  89
  90         if (test_opt(sbi, INLINE_XATTR))
  91                 set_inode_flag(inode, FI_INLINE_XATTR);
  92
  93         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  94                 set_inode_flag(inode, FI_INLINE_DATA);
  95         if (f2fs_may_inline_dentry(inode))
  96                 set_inode_flag(inode, FI_INLINE_DENTRY);
  97
  98         if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
  99                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
 100                 if (f2fs_has_inline_xattr(inode))
 101                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
 102                 /* Otherwise, will be 0 */
 103         } else if (f2fs_has_inline_xattr(inode) ||
 104                                 f2fs_has_inline_dentry(inode)) {
 105                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 106         }
 107         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 108
 109         f2fs_init_extent_tree(inode, NULL);
 110
 111         stat_inc_inline_xattr(inode);
 112         stat_inc_inline_inode(inode);
 113         stat_inc_inline_dir(inode);
 114
 115         F2FS_I(inode)->i_flags =
 116                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 117
 118         if (S_ISDIR(inode->i_mode))
 119                 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
 120
 121         if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
 122                 set_inode_flag(inode, FI_PROJ_INHERIT);
 123
 124         trace_f2fs_new_inode(inode, 0);
 125         return inode;
 126
 127 fail:
 128         trace_f2fs_new_inode(inode, err);
 129         make_bad_inode(inode);
 130         if (nid_free)
 131                 set_inode_flag(inode, FI_FREE_NID);
 132         iput(inode);
 133         return ERR_PTR(err);
 134 fail_drop:
 135         trace_f2fs_new_inode(inode, err);
 136         dquot_drop(inode);
 137         inode->i_flags |= S_NOQUOTA;
 138         if (nid_free)
 139                 set_inode_flag(inode, FI_FREE_NID);
 140         clear_nlink(inode);
 141         unlock_new_inode(inode);
 142         iput(inode);
 143         return ERR_PTR(err);
 144 }
 145
 146 static int is_extension_exist(const unsigned char *s, const char *sub)
 147 {
 148         size_t slen = strlen(s);
 149         size_t sublen = strlen(sub);
 150         int i;
 151
 152         /*
 153          * filename format of multimedia file should be defined as:
 154          * "filename + '.' + extension + (optional: '.' + temp extension)".
 155          */
 156         if (slen < sublen + 2)
 157                 return 0;
 158
 159         for (i = 1; i < slen - sublen; i++) {
 160                 if (s[i] != '.')
 161                         continue;
 162                 if (!strncasecmp(s + i + 1, sub, sublen))
 163                         return 1;
 164         }
 165
 166         return 0;
 167 }
 168
 169 /*
 170  * Set multimedia files as cold files for hot/cold data separation
 171  */
 172 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 173                 const unsigned char *name)
 174 {
 175         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 176         int i, cold_count, hot_count;
 177
 178         down_read(&sbi->sb_lock);
 179
 180         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 181         hot_count = sbi->raw_super->hot_ext_count;
 182
 183         for (i = 0; i < cold_count + hot_count; i++) {
 184                 if (!is_extension_exist(name, extlist[i]))
 185                         continue;
 186                 if (i < cold_count)
 187                         file_set_cold(inode);
 188                 else
 189                         file_set_hot(inode);
 190                 break;
 191         }
 192
 193         up_read(&sbi->sb_lock);
 194 }
 195
 196 int update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 197                                                         bool hot, bool set)
 198 {
 199         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 200         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 201         int hot_count = sbi->raw_super->hot_ext_count;
 202         int total_count = cold_count + hot_count;
 203         int start, count;
 204         int i;
 205
 206         if (set) {
 207                 if (total_count == F2FS_MAX_EXTENSION)
 208                         return -EINVAL;
 209         } else {
 210                 if (!hot && !cold_count)
 211                         return -EINVAL;
 212                 if (hot && !hot_count)
 213                         return -EINVAL;
 214         }
 215
 216         if (hot) {
 217                 start = cold_count;
 218                 count = total_count;
 219         } else {
 220                 start = 0;
 221                 count = cold_count;
 222         }
 223
 224         for (i = start; i < count; i++) {
 225                 if (strcmp(name, extlist[i]))
 226                         continue;
 227
 228                 if (set)
 229                         return -EINVAL;
 230
 231                 memcpy(extlist[i], extlist[i + 1],
 232                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 233                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 234                 if (hot)
 235                         sbi->raw_super->hot_ext_count = hot_count - 1;
 236                 else
 237                         sbi->raw_super->extension_count =
 238                                                 cpu_to_le32(cold_count - 1);
 239                 return 0;
 240         }
 241
 242         if (!set)
 243                 return -EINVAL;
 244
 245         if (hot) {
 246                 strncpy(extlist[count], name, strlen(name));
 247                 sbi->raw_super->hot_ext_count = hot_count + 1;
 248         } else {
 249                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 250
 251                 memcpy(buf, &extlist[cold_count],
 252                                 F2FS_EXTENSION_LEN * hot_count);
 253                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 254                 strncpy(extlist[cold_count], name, strlen(name));
 255                 memcpy(&extlist[cold_count + 1], buf,
 256                                 F2FS_EXTENSION_LEN * hot_count);
 257                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 258         }
 259         return 0;
 260 }
 261
 262 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 263                                                 bool excl)
 264 {
 265         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 266         struct inode *inode;
 267         nid_t ino = 0;
 268         int err;
 269
 270         if (unlikely(f2fs_cp_error(sbi)))
 271                 return -EIO;
 272
 273         err = dquot_initialize(dir);
 274         if (err)
 275                 return err;
 276
 277         inode = f2fs_new_inode(dir, mode);
 278         if (IS_ERR(inode))
 279                 return PTR_ERR(inode);
 280
 281         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 282                 set_file_temperature(sbi, inode, dentry->d_name.name);
 283
 284         inode->i_op = &f2fs_file_inode_operations;
 285         inode->i_fop = &f2fs_file_operations;
 286         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 287         ino = inode->i_ino;
 288
 289         f2fs_lock_op(sbi);
 290         err = f2fs_add_link(dentry, inode);
 291         if (err)
 292                 goto out;
 293         f2fs_unlock_op(sbi);
 294
 295         alloc_nid_done(sbi, ino);
 296
 297         d_instantiate_new(dentry, inode);
 298
 299         if (IS_DIRSYNC(dir))
 300                 f2fs_sync_fs(sbi->sb, 1);
 301
 302         f2fs_balance_fs(sbi, true);
 303         return 0;
 304 out:
 305         handle_failed_inode(inode);
 306         return err;
 307 }
 308
 309 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 310                 struct dentry *dentry)
 311 {
 312         struct inode *inode = d_inode(old_dentry);
 313         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 314         int err;
 315
 316         if (unlikely(f2fs_cp_error(sbi)))
 317                 return -EIO;
 318
 319         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 320         if (err)
 321                 return err;
 322
 323         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 324                         (!projid_eq(F2FS_I(dir)->i_projid,
 325                         F2FS_I(old_dentry->d_inode)->i_projid)))
 326                 return -EXDEV;
 327
 328         err = dquot_initialize(dir);
 329         if (err)
 330                 return err;
 331
 332         f2fs_balance_fs(sbi, true);
 333
 334         inode->i_ctime = current_time(inode);
 335         ihold(inode);
 336
 337         set_inode_flag(inode, FI_INC_LINK);
 338         f2fs_lock_op(sbi);
 339         err = f2fs_add_link(dentry, inode);
 340         if (err)
 341                 goto out;
 342         f2fs_unlock_op(sbi);
 343
 344         d_instantiate(dentry, inode);
 345
 346         if (IS_DIRSYNC(dir))
 347                 f2fs_sync_fs(sbi->sb, 1);
 348         return 0;
 349 out:
 350         clear_inode_flag(inode, FI_INC_LINK);
 351         iput(inode);
 352         f2fs_unlock_op(sbi);
 353         return err;
 354 }
 355
 356 struct dentry *f2fs_get_parent(struct dentry *child)
 357 {
 358         struct qstr dotdot = QSTR_INIT("..", 2);
 359         struct page *page;
 360         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 361         if (!ino) {
 362                 if (IS_ERR(page))
 363                         return ERR_CAST(page);
 364                 return ERR_PTR(-ENOENT);
 365         }
 366         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 367 }
 368
 369 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 370 {
 371         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 372         struct qstr dot = QSTR_INIT(".", 1);
 373         struct qstr dotdot = QSTR_INIT("..", 2);
 374         struct f2fs_dir_entry *de;
 375         struct page *page;
 376         int err = 0;
 377
 378         if (f2fs_readonly(sbi->sb)) {
 379                 f2fs_msg(sbi->sb, KERN_INFO,
 380                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 381                         "in readonly mountpoint", dir->i_ino, pino);
 382                 return 0;
 383         }
 384
 385         err = dquot_initialize(dir);
 386         if (err)
 387                 return err;
 388
 389         f2fs_balance_fs(sbi, true);
 390
 391         f2fs_lock_op(sbi);
 392
 393         de = f2fs_find_entry(dir, &dot, &page);
 394         if (de) {
 395                 f2fs_put_page(page, 0);
 396         } else if (IS_ERR(page)) {
 397                 err = PTR_ERR(page);
 398                 goto out;
 399         } else {
 400                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 401                 if (err)
 402                         goto out;
 403         }
 404
 405         de = f2fs_find_entry(dir, &dotdot, &page);
 406         if (de)
 407                 f2fs_put_page(page, 0);
 408         else if (IS_ERR(page))
 409                 err = PTR_ERR(page);
 410         else
 411                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 412 out:
 413         if (!err)
 414                 clear_inode_flag(dir, FI_INLINE_DOTS);
 415
 416         f2fs_unlock_op(sbi);
 417         return err;
 418 }
 419
 420 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 421                 unsigned int flags)
 422 {
 423         struct inode *inode = NULL;
 424         struct f2fs_dir_entry *de;
 425         struct page *page;
 426         struct dentry *new;
 427         nid_t ino = -1;
 428         int err = 0;
 429         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 430
 431         trace_f2fs_lookup_start(dir, dentry, flags);
 432
 433         err = fscrypt_prepare_lookup(dir, dentry, flags);
 434         if (err)
 435                 goto out;
 436
 437         if (dentry->d_name.len > F2FS_NAME_LEN) {
 438                 err = -ENAMETOOLONG;
 439                 goto out;
 440         }
 441
 442         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 443         if (!de) {
 444                 if (IS_ERR(page)) {
 445                         err = PTR_ERR(page);
 446                         goto out;
 447                 }
 448                 goto out_splice;
 449         }
 450
 451         ino = le32_to_cpu(de->ino);
 452         f2fs_put_page(page, 0);
 453
 454         inode = f2fs_iget(dir->i_sb, ino);
 455         if (IS_ERR(inode)) {
 456                 err = PTR_ERR(inode);
 457                 goto out;
 458         }
 459
 460         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 461                 err = __recover_dot_dentries(dir, root_ino);
 462                 if (err)
 463                         goto out_iput;
 464         }
 465
 466         if (f2fs_has_inline_dots(inode)) {
 467                 err = __recover_dot_dentries(inode, dir->i_ino);
 468                 if (err)
 469                         goto out_iput;
 470         }
 471         if (f2fs_encrypted_inode(dir) &&
 472             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 473             !fscrypt_has_permitted_context(dir, inode)) {
 474                 f2fs_msg(inode->i_sb, KERN_WARNING,
 475                          "Inconsistent encryption contexts: %lu/%lu",
 476                          dir->i_ino, inode->i_ino);
 477                 err = -EPERM;
 478                 goto out_iput;
 479         }
 480 out_splice:
 481         new = d_splice_alias(inode, dentry);
 482         if (IS_ERR(new))
 483                 err = PTR_ERR(new);
 484         trace_f2fs_lookup_end(dir, dentry, ino, err);
 485         return new;
 486 out_iput:
 487         iput(inode);
 488 out:
 489         trace_f2fs_lookup_end(dir, dentry, ino, err);
 490         return ERR_PTR(err);
 491 }
 492
 493 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 494 {
 495         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 496         struct inode *inode = d_inode(dentry);
 497         struct f2fs_dir_entry *de;
 498         struct page *page;
 499         int err = -ENOENT;
 500
 501         trace_f2fs_unlink_enter(dir, dentry);
 502
 503         if (unlikely(f2fs_cp_error(sbi)))
 504                 return -EIO;
 505
 506         err = dquot_initialize(dir);
 507         if (err)
 508                 return err;
 509         err = dquot_initialize(inode);
 510         if (err)
 511                 return err;
 512
 513         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 514         if (!de) {
 515                 if (IS_ERR(page))
 516                         err = PTR_ERR(page);
 517                 goto fail;
 518         }
 519
 520         f2fs_balance_fs(sbi, true);
 521
 522         f2fs_lock_op(sbi);
 523         err = acquire_orphan_inode(sbi);
 524         if (err) {
 525                 f2fs_unlock_op(sbi);
 526                 f2fs_put_page(page, 0);
 527                 goto fail;
 528         }
 529         f2fs_delete_entry(de, page, dir, inode);
 530         f2fs_unlock_op(sbi);
 531
 532         if (IS_DIRSYNC(dir))
 533                 f2fs_sync_fs(sbi->sb, 1);
 534 fail:
 535         trace_f2fs_unlink_exit(inode, err);
 536         return err;
 537 }
 538
 539 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
 540 {
 541         const char *link = page_follow_link_light(dentry, cookie);
 542         if (!IS_ERR(link) && !*link) {
 543                 /* this is broken symlink case */
 544                 page_put_link(NULL, *cookie);
 545                 link = ERR_PTR(-ENOENT);
 546         }
 547         return link;
 548 }
 549
 550 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 551                                         const char *symname)
 552 {
 553         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 554         struct inode *inode;
 555         size_t len = strlen(symname);
 556         struct fscrypt_str disk_link;
 557         int err;
 558
 559         if (unlikely(f2fs_cp_error(sbi)))
 560                 return -EIO;
 561
 562         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 563                                       &disk_link);
 564         if (err)
 565                 return err;
 566
 567         err = dquot_initialize(dir);
 568         if (err)
 569                 return err;
 570
 571         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 572         if (IS_ERR(inode))
 573                 return PTR_ERR(inode);
 574
 575         if (IS_ENCRYPTED(inode))
 576                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 577         else
 578                 inode->i_op = &f2fs_symlink_inode_operations;
 579         inode_nohighmem(inode);
 580         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 581
 582         f2fs_lock_op(sbi);
 583         err = f2fs_add_link(dentry, inode);
 584         if (err)
 585                 goto out_handle_failed_inode;
 586         f2fs_unlock_op(sbi);
 587         alloc_nid_done(sbi, inode->i_ino);
 588
 589         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 590         if (err)
 591                 goto err_out;
 592
 593         err = page_symlink(inode, disk_link.name, disk_link.len);
 594
 595 err_out:
 596         d_instantiate_new(dentry, inode);
 597
 598         /*
 599          * Let's flush symlink data in order to avoid broken symlink as much as
 600          * possible. Nevertheless, fsyncing is the best way, but there is no
 601          * way to get a file descriptor in order to flush that.
 602          *
 603          * Note that, it needs to do dir->fsync to make this recoverable.
 604          * If the symlink path is stored into inline_data, there is no
 605          * performance regression.
 606          */
 607         if (!err) {
 608                 filemap_write_and_wait_range(inode->i_mapping, 0,
 609                                                         disk_link.len - 1);
 610
 611                 if (IS_DIRSYNC(dir))
 612                         f2fs_sync_fs(sbi->sb, 1);
 613         } else {
 614                 f2fs_unlink(dir, dentry);
 615         }
 616
 617         f2fs_balance_fs(sbi, true);
 618         goto out_free_encrypted_link;
 619
 620 out_handle_failed_inode:
 621         handle_failed_inode(inode);
 622 out_free_encrypted_link:
 623         if (disk_link.name != (unsigned char *)symname)
 624                 kfree(disk_link.name);
 625         return err;
 626 }
 627
 628 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 629 {
 630         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 631         struct inode *inode;
 632         int err;
 633
 634         if (unlikely(f2fs_cp_error(sbi)))
 635                 return -EIO;
 636
 637         err = dquot_initialize(dir);
 638         if (err)
 639                 return err;
 640
 641         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 642         if (IS_ERR(inode))
 643                 return PTR_ERR(inode);
 644
 645         inode->i_op = &f2fs_dir_inode_operations;
 646         inode->i_fop = &f2fs_dir_operations;
 647         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 648         inode_nohighmem(inode);
 649
 650         set_inode_flag(inode, FI_INC_LINK);
 651         f2fs_lock_op(sbi);
 652         err = f2fs_add_link(dentry, inode);
 653         if (err)
 654                 goto out_fail;
 655         f2fs_unlock_op(sbi);
 656
 657         alloc_nid_done(sbi, inode->i_ino);
 658
 659         d_instantiate_new(dentry, inode);
 660
 661         if (IS_DIRSYNC(dir))
 662                 f2fs_sync_fs(sbi->sb, 1);
 663
 664         f2fs_balance_fs(sbi, true);
 665         return 0;
 666
 667 out_fail:
 668         clear_inode_flag(inode, FI_INC_LINK);
 669         handle_failed_inode(inode);
 670         return err;
 671 }
 672
 673 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 674 {
 675         struct inode *inode = d_inode(dentry);
 676         if (f2fs_empty_dir(inode))
 677                 return f2fs_unlink(dir, dentry);
 678         return -ENOTEMPTY;
 679 }
 680
 681 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 682                                 umode_t mode, dev_t rdev)
 683 {
 684         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 685         struct inode *inode;
 686         int err = 0;
 687
 688         if (unlikely(f2fs_cp_error(sbi)))
 689                 return -EIO;
 690
 691         err = dquot_initialize(dir);
 692         if (err)
 693                 return err;
 694
 695         inode = f2fs_new_inode(dir, mode);
 696         if (IS_ERR(inode))
 697                 return PTR_ERR(inode);
 698
 699         init_special_inode(inode, inode->i_mode, rdev);
 700         inode->i_op = &f2fs_special_inode_operations;
 701
 702         f2fs_lock_op(sbi);
 703         err = f2fs_add_link(dentry, inode);
 704         if (err)
 705                 goto out;
 706         f2fs_unlock_op(sbi);
 707
 708         alloc_nid_done(sbi, inode->i_ino);
 709
 710         d_instantiate_new(dentry, inode);
 711
 712         if (IS_DIRSYNC(dir))
 713                 f2fs_sync_fs(sbi->sb, 1);
 714
 715         f2fs_balance_fs(sbi, true);
 716         return 0;
 717 out:
 718         handle_failed_inode(inode);
 719         return err;
 720 }
 721
 722 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 723                                         umode_t mode, struct inode **whiteout)
 724 {
 725         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 726         struct inode *inode;
 727         int err;
 728
 729         err = dquot_initialize(dir);
 730         if (err)
 731                 return err;
 732
 733         inode = f2fs_new_inode(dir, mode);
 734         if (IS_ERR(inode))
 735                 return PTR_ERR(inode);
 736
 737         if (whiteout) {
 738                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 739                 inode->i_op = &f2fs_special_inode_operations;
 740         } else {
 741                 inode->i_op = &f2fs_file_inode_operations;
 742                 inode->i_fop = &f2fs_file_operations;
 743                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 744         }
 745
 746         f2fs_lock_op(sbi);
 747         err = acquire_orphan_inode(sbi);
 748         if (err)
 749                 goto out;
 750
 751         err = f2fs_do_tmpfile(inode, dir);
 752         if (err)
 753                 goto release_out;
 754
 755         /*
 756          * add this non-linked tmpfile to orphan list, in this way we could
 757          * remove all unused data of tmpfile after abnormal power-off.
 758          */
 759         add_orphan_inode(inode);
 760         alloc_nid_done(sbi, inode->i_ino);
 761
 762         if (whiteout) {
 763                 f2fs_i_links_write(inode, false);
 764                 *whiteout = inode;
 765         } else {
 766                 d_tmpfile(dentry, inode);
 767         }
 768         /* link_count was changed by d_tmpfile as well. */
 769         f2fs_unlock_op(sbi);
 770         unlock_new_inode(inode);
 771
 772         f2fs_balance_fs(sbi, true);
 773         return 0;
 774
 775 release_out:
 776         release_orphan_inode(sbi);
 777 out:
 778         handle_failed_inode(inode);
 779         return err;
 780 }
 781
 782 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 783 {
 784         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 785
 786         if (unlikely(f2fs_cp_error(sbi)))
 787                 return -EIO;
 788
 789         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 790                 int err = fscrypt_get_encryption_info(dir);
 791                 if (err)
 792                         return err;
 793         }
 794
 795         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 796 }
 797
 798 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 799 {
 800         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 801                 return -EIO;
 802
 803         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 804 }
 805
 806 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 807                         struct inode *new_dir, struct dentry *new_dentry,
 808                         unsigned int flags)
 809 {
 810         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 811         struct inode *old_inode = d_inode(old_dentry);
 812         struct inode *new_inode = d_inode(new_dentry);
 813         struct inode *whiteout = NULL;
 814         struct page *old_dir_page;
 815         struct page *old_page, *new_page = NULL;
 816         struct f2fs_dir_entry *old_dir_entry = NULL;
 817         struct f2fs_dir_entry *old_entry;
 818         struct f2fs_dir_entry *new_entry;
 819         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 820         int err = -ENOENT;
 821
 822         if (unlikely(f2fs_cp_error(sbi)))
 823                 return -EIO;
 824
 825         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 826                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 827                         F2FS_I(old_dentry->d_inode)->i_projid)))
 828                 return -EXDEV;
 829
 830         err = dquot_initialize(old_dir);
 831         if (err)
 832                 goto out;
 833
 834         err = dquot_initialize(new_dir);
 835         if (err)
 836                 goto out;
 837
 838         if (new_inode) {
 839                 err = dquot_initialize(new_inode);
 840                 if (err)
 841                         goto out;
 842         }
 843
 844         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 845         if (!old_entry) {
 846                 if (IS_ERR(old_page))
 847                         err = PTR_ERR(old_page);
 848                 goto out;
 849         }
 850
 851         if (S_ISDIR(old_inode->i_mode)) {
 852                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 853                 if (!old_dir_entry) {
 854                         if (IS_ERR(old_dir_page))
 855                                 err = PTR_ERR(old_dir_page);
 856                         goto out_old;
 857                 }
 858         }
 859
 860         if (flags & RENAME_WHITEOUT) {
 861                 err = f2fs_create_whiteout(old_dir, &whiteout);
 862                 if (err)
 863                         goto out_dir;
 864         }
 865
 866         if (new_inode) {
 867
 868                 err = -ENOTEMPTY;
 869                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 870                         goto out_whiteout;
 871
 872                 err = -ENOENT;
 873                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 874                                                 &new_page);
 875                 if (!new_entry) {
 876                         if (IS_ERR(new_page))
 877                                 err = PTR_ERR(new_page);
 878                         goto out_whiteout;
 879                 }
 880
 881                 f2fs_balance_fs(sbi, true);
 882
 883                 f2fs_lock_op(sbi);
 884
 885                 err = acquire_orphan_inode(sbi);
 886                 if (err)
 887                         goto put_out_dir;
 888
 889                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 890
 891                 new_inode->i_ctime = current_time(new_inode);
 892                 down_write(&F2FS_I(new_inode)->i_sem);
 893                 if (old_dir_entry)
 894                         f2fs_i_links_write(new_inode, false);
 895                 f2fs_i_links_write(new_inode, false);
 896                 up_write(&F2FS_I(new_inode)->i_sem);
 897
 898                 if (!new_inode->i_nlink)
 899                         add_orphan_inode(new_inode);
 900                 else
 901                         release_orphan_inode(sbi);
 902         } else {
 903                 f2fs_balance_fs(sbi, true);
 904
 905                 f2fs_lock_op(sbi);
 906
 907                 err = f2fs_add_link(new_dentry, old_inode);
 908                 if (err) {
 909                         f2fs_unlock_op(sbi);
 910                         goto out_whiteout;
 911                 }
 912
 913                 if (old_dir_entry)
 914                         f2fs_i_links_write(new_dir, true);
 915
 916                 /*
 917                  * old entry and new entry can locate in the same inline
 918                  * dentry in inode, when attaching new entry in inline dentry,
 919                  * it could force inline dentry conversion, after that,
 920                  * old_entry and old_page will point to wrong address, in
 921                  * order to avoid this, let's do the check and update here.
 922                  */
 923                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 924                         f2fs_put_page(old_page, 0);
 925                         old_page = NULL;
 926
 927                         old_entry = f2fs_find_entry(old_dir,
 928                                                 &old_dentry->d_name, &old_page);
 929                         if (!old_entry) {
 930                                 err = -ENOENT;
 931                                 if (IS_ERR(old_page))
 932                                         err = PTR_ERR(old_page);
 933                                 f2fs_unlock_op(sbi);
 934                                 goto out_whiteout;
 935                         }
 936                 }
 937         }
 938
 939         down_write(&F2FS_I(old_inode)->i_sem);
 940         if (!old_dir_entry || whiteout)
 941                 file_lost_pino(old_inode);
 942         else
 943                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 944         up_write(&F2FS_I(old_inode)->i_sem);
 945
 946         old_inode->i_ctime = current_time(old_inode);
 947         f2fs_mark_inode_dirty_sync(old_inode, false);
 948
 949         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 950
 951         if (whiteout) {
 952                 whiteout->i_state |= I_LINKABLE;
 953                 set_inode_flag(whiteout, FI_INC_LINK);
 954                 err = f2fs_add_link(old_dentry, whiteout);
 955                 if (err)
 956                         goto put_out_dir;
 957                 whiteout->i_state &= ~I_LINKABLE;
 958                 iput(whiteout);
 959         }
 960
 961         if (old_dir_entry) {
 962                 if (old_dir != new_dir && !whiteout)
 963                         f2fs_set_link(old_inode, old_dir_entry,
 964                                                 old_dir_page, new_dir);
 965                 else
 966                         f2fs_put_page(old_dir_page, 0);
 967                 f2fs_i_links_write(old_dir, false);
 968         }
 969         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
 970                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 971
 972         f2fs_unlock_op(sbi);
 973
 974         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 975                 f2fs_sync_fs(sbi->sb, 1);
 976         return 0;
 977
 978 put_out_dir:
 979         f2fs_unlock_op(sbi);
 980         if (new_page)
 981                 f2fs_put_page(new_page, 0);
 982 out_whiteout:
 983         if (whiteout)
 984                 iput(whiteout);
 985 out_dir:
 986         if (old_dir_entry)
 987                 f2fs_put_page(old_dir_page, 0);
 988 out_old:
 989         f2fs_put_page(old_page, 0);
 990 out:
 991         return err;
 992 }
 993
 994 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 995                              struct inode *new_dir, struct dentry *new_dentry)
 996 {
 997         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 998         struct inode *old_inode = d_inode(old_dentry);
 999         struct inode *new_inode = d_inode(new_dentry);
1000         struct page *old_dir_page, *new_dir_page;
1001         struct page *old_page, *new_page;
1002         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1003         struct f2fs_dir_entry *old_entry, *new_entry;
1004         int old_nlink = 0, new_nlink = 0;
1005         int err = -ENOENT;
1006
1007         if (unlikely(f2fs_cp_error(sbi)))
1008                 return -EIO;
1009
1010         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1011                         !projid_eq(F2FS_I(new_dir)->i_projid,
1012                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1013             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1014                         !projid_eq(F2FS_I(old_dir)->i_projid,
1015                         F2FS_I(new_dentry->d_inode)->i_projid)))
1016                 return -EXDEV;
1017
1018         err = dquot_initialize(old_dir);
1019         if (err)
1020                 goto out;
1021
1022         err = dquot_initialize(new_dir);
1023         if (err)
1024                 goto out;
1025
1026         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1027         if (!old_entry) {
1028                 if (IS_ERR(old_page))
1029                         err = PTR_ERR(old_page);
1030                 goto out;
1031         }
1032
1033         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1034         if (!new_entry) {
1035                 if (IS_ERR(new_page))
1036                         err = PTR_ERR(new_page);
1037                 goto out_old;
1038         }
1039
1040         /* prepare for updating ".." directory entry info later */
1041         if (old_dir != new_dir) {
1042                 if (S_ISDIR(old_inode->i_mode)) {
1043                         old_dir_entry = f2fs_parent_dir(old_inode,
1044                                                         &old_dir_page);
1045                         if (!old_dir_entry) {
1046                                 if (IS_ERR(old_dir_page))
1047                                         err = PTR_ERR(old_dir_page);
1048                                 goto out_new;
1049                         }
1050                 }
1051
1052                 if (S_ISDIR(new_inode->i_mode)) {
1053                         new_dir_entry = f2fs_parent_dir(new_inode,
1054                                                         &new_dir_page);
1055                         if (!new_dir_entry) {
1056                                 if (IS_ERR(new_dir_page))
1057                                         err = PTR_ERR(new_dir_page);
1058                                 goto out_old_dir;
1059                         }
1060                 }
1061         }
1062
1063         /*
1064          * If cross rename between file and directory those are not
1065          * in the same directory, we will inc nlink of file's parent
1066          * later, so we should check upper boundary of its nlink.
1067          */
1068         if ((!old_dir_entry || !new_dir_entry) &&
1069                                 old_dir_entry != new_dir_entry) {
1070                 old_nlink = old_dir_entry ? -1 : 1;
1071                 new_nlink = -old_nlink;
1072                 err = -EMLINK;
1073                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1074                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1075                         goto out_new_dir;
1076         }
1077
1078         f2fs_balance_fs(sbi, true);
1079
1080         f2fs_lock_op(sbi);
1081
1082         /* update ".." directory entry info of old dentry */
1083         if (old_dir_entry)
1084                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1085
1086         /* update ".." directory entry info of new dentry */
1087         if (new_dir_entry)
1088                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1089
1090         /* update directory entry info of old dir inode */
1091         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1092
1093         down_write(&F2FS_I(old_inode)->i_sem);
1094         file_lost_pino(old_inode);
1095         up_write(&F2FS_I(old_inode)->i_sem);
1096
1097         old_dir->i_ctime = current_time(old_dir);
1098         if (old_nlink) {
1099                 down_write(&F2FS_I(old_dir)->i_sem);
1100                 f2fs_i_links_write(old_dir, old_nlink > 0);
1101                 up_write(&F2FS_I(old_dir)->i_sem);
1102         }
1103         f2fs_mark_inode_dirty_sync(old_dir, false);
1104
1105         /* update directory entry info of new dir inode */
1106         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1107
1108         down_write(&F2FS_I(new_inode)->i_sem);
1109         file_lost_pino(new_inode);
1110         up_write(&F2FS_I(new_inode)->i_sem);
1111
1112         new_dir->i_ctime = current_time(new_dir);
1113         if (new_nlink) {
1114                 down_write(&F2FS_I(new_dir)->i_sem);
1115                 f2fs_i_links_write(new_dir, new_nlink > 0);
1116                 up_write(&F2FS_I(new_dir)->i_sem);
1117         }
1118         f2fs_mark_inode_dirty_sync(new_dir, false);
1119
1120         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1121                 add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1122                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1123         }
1124
1125         f2fs_unlock_op(sbi);
1126
1127         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1128                 f2fs_sync_fs(sbi->sb, 1);
1129         return 0;
1130 out_new_dir:
1131         if (new_dir_entry) {
1132                 f2fs_put_page(new_dir_page, 0);
1133         }
1134 out_old_dir:
1135         if (old_dir_entry) {
1136                 f2fs_put_page(old_dir_page, 0);
1137         }
1138 out_new:
1139         f2fs_put_page(new_page, 0);
1140 out_old:
1141         f2fs_put_page(old_page, 0);
1142 out:
1143         return err;
1144 }
1145
1146 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1147                         struct inode *new_dir, struct dentry *new_dentry,
1148                         unsigned int flags)
1149 {
1150         int err;
1151
1152         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1153                 return -EINVAL;
1154
1155         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1156                                      flags);
1157         if (err)
1158                 return err;
1159
1160         if (flags & RENAME_EXCHANGE) {
1161                 return f2fs_cross_rename(old_dir, old_dentry,
1162                                          new_dir, new_dentry);
1163         }
1164         /*
1165          * VFS has already handled the new dentry existence case,
1166          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1167          */
1168         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1169 }
1170
1171 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1172 {
1173         struct inode *inode = d_inode(dentry);
1174         struct page *page;
1175         void *target;
1176
1177         if (!dentry)
1178                 return ERR_PTR(-ECHILD);
1179
1180         page = read_mapping_page(inode->i_mapping, 0, NULL);
1181         if (IS_ERR(page))
1182                 return ERR_CAST(page);
1183
1184         target = fscrypt_get_symlink(inode, page_address(page),
1185                                      inode->i_sb->s_blocksize);
1186         put_page(page);
1187         return *cookie = target;
1188 }
1189
1190 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1191         .readlink       = generic_readlink,
1192         .follow_link    = f2fs_encrypted_follow_link,
1193         .put_link       = kfree_put_link,
1194         .getattr        = f2fs_getattr,
1195         .setattr        = f2fs_setattr,
1196 #ifdef CONFIG_F2FS_FS_XATTR
1197         .setxattr       = generic_setxattr,
1198         .getxattr       = generic_getxattr,
1199         .listxattr      = f2fs_listxattr,
1200         .removexattr    = generic_removexattr,
1201 #endif
1202 };
1203
1204 const struct inode_operations f2fs_dir_inode_operations = {
1205         .create         = f2fs_create,
1206         .lookup         = f2fs_lookup,
1207         .link           = f2fs_link,
1208         .unlink         = f2fs_unlink,
1209         .symlink        = f2fs_symlink,
1210         .mkdir          = f2fs_mkdir,
1211         .rmdir          = f2fs_rmdir,
1212         .mknod          = f2fs_mknod,
1213         .rename2        = f2fs_rename2,
1214         .tmpfile        = f2fs_tmpfile,
1215         .getattr        = f2fs_getattr,
1216         .setattr        = f2fs_setattr,
1217         .get_acl        = f2fs_get_acl,
1218         .set_acl        = f2fs_set_acl,
1219 #ifdef CONFIG_F2FS_FS_XATTR
1220         .setxattr       = generic_setxattr,
1221         .getxattr       = generic_getxattr,
1222         .listxattr      = f2fs_listxattr,
1223         .removexattr    = generic_removexattr,
1224 #endif
1225 };
1226
1227 const struct inode_operations f2fs_symlink_inode_operations = {
1228         .readlink       = generic_readlink,
1229         .follow_link    = f2fs_follow_link,
1230         .put_link       = page_put_link,
1231         .getattr        = f2fs_getattr,
1232         .setattr        = f2fs_setattr,
1233 #ifdef CONFIG_F2FS_FS_XATTR
1234         .setxattr       = generic_setxattr,
1235         .getxattr       = generic_getxattr,
1236         .listxattr      = f2fs_listxattr,
1237         .removexattr    = generic_removexattr,
1238 #endif
1239 };
1240
1241 const struct inode_operations f2fs_special_inode_operations = {
1242         .getattr        = f2fs_getattr,
1243         .setattr        = f2fs_setattr,
1244         .get_acl        = f2fs_get_acl,
1245         .set_acl        = f2fs_set_acl,
1246 #ifdef CONFIG_F2FS_FS_XATTR
1247         .setxattr       = generic_setxattr,
1248         .getxattr       = generic_getxattr,
1249         .listxattr      = f2fs_listxattr,
1250         .removexattr    = generic_removexattr,
1251 #endif
1252 };