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_get_link(struct dentry *dentry,
 540                                  struct inode *inode,
 541                                  struct delayed_call *done)
 542 {
 543         const char *link = page_get_link(dentry, inode, done);
 544         if (!IS_ERR(link) && !*link) {
 545                 /* this is broken symlink case */
 546                 do_delayed_call(done);
 547                 clear_delayed_call(done);
 548                 link = ERR_PTR(-ENOENT);
 549         }
 550         return link;
 551 }
 552
 553 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 554                                         const char *symname)
 555 {
 556         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 557         struct inode *inode;
 558         size_t len = strlen(symname);
 559         struct fscrypt_str disk_link;
 560         int err;
 561
 562         if (unlikely(f2fs_cp_error(sbi)))
 563                 return -EIO;
 564
 565         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 566                                       &disk_link);
 567         if (err)
 568                 return err;
 569
 570         err = dquot_initialize(dir);
 571         if (err)
 572                 return err;
 573
 574         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 575         if (IS_ERR(inode))
 576                 return PTR_ERR(inode);
 577
 578         if (IS_ENCRYPTED(inode))
 579                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 580         else
 581                 inode->i_op = &f2fs_symlink_inode_operations;
 582         inode_nohighmem(inode);
 583         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 584
 585         f2fs_lock_op(sbi);
 586         err = f2fs_add_link(dentry, inode);
 587         if (err)
 588                 goto out_handle_failed_inode;
 589         f2fs_unlock_op(sbi);
 590         alloc_nid_done(sbi, inode->i_ino);
 591
 592         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 593         if (err)
 594                 goto err_out;
 595
 596         err = page_symlink(inode, disk_link.name, disk_link.len);
 597
 598 err_out:
 599         d_instantiate_new(dentry, inode);
 600
 601         /*
 602          * Let's flush symlink data in order to avoid broken symlink as much as
 603          * possible. Nevertheless, fsyncing is the best way, but there is no
 604          * way to get a file descriptor in order to flush that.
 605          *
 606          * Note that, it needs to do dir->fsync to make this recoverable.
 607          * If the symlink path is stored into inline_data, there is no
 608          * performance regression.
 609          */
 610         if (!err) {
 611                 filemap_write_and_wait_range(inode->i_mapping, 0,
 612                                                         disk_link.len - 1);
 613
 614                 if (IS_DIRSYNC(dir))
 615                         f2fs_sync_fs(sbi->sb, 1);
 616         } else {
 617                 f2fs_unlink(dir, dentry);
 618         }
 619
 620         f2fs_balance_fs(sbi, true);
 621         goto out_free_encrypted_link;
 622
 623 out_handle_failed_inode:
 624         handle_failed_inode(inode);
 625 out_free_encrypted_link:
 626         if (disk_link.name != (unsigned char *)symname)
 627                 kfree(disk_link.name);
 628         return err;
 629 }
 630
 631 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 632 {
 633         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 634         struct inode *inode;
 635         int err;
 636
 637         if (unlikely(f2fs_cp_error(sbi)))
 638                 return -EIO;
 639
 640         err = dquot_initialize(dir);
 641         if (err)
 642                 return err;
 643
 644         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 645         if (IS_ERR(inode))
 646                 return PTR_ERR(inode);
 647
 648         inode->i_op = &f2fs_dir_inode_operations;
 649         inode->i_fop = &f2fs_dir_operations;
 650         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 651         inode_nohighmem(inode);
 652
 653         set_inode_flag(inode, FI_INC_LINK);
 654         f2fs_lock_op(sbi);
 655         err = f2fs_add_link(dentry, inode);
 656         if (err)
 657                 goto out_fail;
 658         f2fs_unlock_op(sbi);
 659
 660         alloc_nid_done(sbi, inode->i_ino);
 661
 662         d_instantiate_new(dentry, inode);
 663
 664         if (IS_DIRSYNC(dir))
 665                 f2fs_sync_fs(sbi->sb, 1);
 666
 667         f2fs_balance_fs(sbi, true);
 668         return 0;
 669
 670 out_fail:
 671         clear_inode_flag(inode, FI_INC_LINK);
 672         handle_failed_inode(inode);
 673         return err;
 674 }
 675
 676 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 677 {
 678         struct inode *inode = d_inode(dentry);
 679         if (f2fs_empty_dir(inode))
 680                 return f2fs_unlink(dir, dentry);
 681         return -ENOTEMPTY;
 682 }
 683
 684 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 685                                 umode_t mode, dev_t rdev)
 686 {
 687         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 688         struct inode *inode;
 689         int err = 0;
 690
 691         if (unlikely(f2fs_cp_error(sbi)))
 692                 return -EIO;
 693
 694         err = dquot_initialize(dir);
 695         if (err)
 696                 return err;
 697
 698         inode = f2fs_new_inode(dir, mode);
 699         if (IS_ERR(inode))
 700                 return PTR_ERR(inode);
 701
 702         init_special_inode(inode, inode->i_mode, rdev);
 703         inode->i_op = &f2fs_special_inode_operations;
 704
 705         f2fs_lock_op(sbi);
 706         err = f2fs_add_link(dentry, inode);
 707         if (err)
 708                 goto out;
 709         f2fs_unlock_op(sbi);
 710
 711         alloc_nid_done(sbi, inode->i_ino);
 712
 713         d_instantiate_new(dentry, inode);
 714
 715         if (IS_DIRSYNC(dir))
 716                 f2fs_sync_fs(sbi->sb, 1);
 717
 718         f2fs_balance_fs(sbi, true);
 719         return 0;
 720 out:
 721         handle_failed_inode(inode);
 722         return err;
 723 }
 724
 725 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 726                                         umode_t mode, struct inode **whiteout)
 727 {
 728         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 729         struct inode *inode;
 730         int err;
 731
 732         err = dquot_initialize(dir);
 733         if (err)
 734                 return err;
 735
 736         inode = f2fs_new_inode(dir, mode);
 737         if (IS_ERR(inode))
 738                 return PTR_ERR(inode);
 739
 740         if (whiteout) {
 741                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 742                 inode->i_op = &f2fs_special_inode_operations;
 743         } else {
 744                 inode->i_op = &f2fs_file_inode_operations;
 745                 inode->i_fop = &f2fs_file_operations;
 746                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 747         }
 748
 749         f2fs_lock_op(sbi);
 750         err = acquire_orphan_inode(sbi);
 751         if (err)
 752                 goto out;
 753
 754         err = f2fs_do_tmpfile(inode, dir);
 755         if (err)
 756                 goto release_out;
 757
 758         /*
 759          * add this non-linked tmpfile to orphan list, in this way we could
 760          * remove all unused data of tmpfile after abnormal power-off.
 761          */
 762         add_orphan_inode(inode);
 763         alloc_nid_done(sbi, inode->i_ino);
 764
 765         if (whiteout) {
 766                 f2fs_i_links_write(inode, false);
 767                 *whiteout = inode;
 768         } else {
 769                 d_tmpfile(dentry, inode);
 770         }
 771         /* link_count was changed by d_tmpfile as well. */
 772         f2fs_unlock_op(sbi);
 773         unlock_new_inode(inode);
 774
 775         f2fs_balance_fs(sbi, true);
 776         return 0;
 777
 778 release_out:
 779         release_orphan_inode(sbi);
 780 out:
 781         handle_failed_inode(inode);
 782         return err;
 783 }
 784
 785 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 786 {
 787         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 788
 789         if (unlikely(f2fs_cp_error(sbi)))
 790                 return -EIO;
 791
 792         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 793                 int err = fscrypt_get_encryption_info(dir);
 794                 if (err)
 795                         return err;
 796         }
 797
 798         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 799 }
 800
 801 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 802 {
 803         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 804                 return -EIO;
 805
 806         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 807 }
 808
 809 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 810                         struct inode *new_dir, struct dentry *new_dentry,
 811                         unsigned int flags)
 812 {
 813         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 814         struct inode *old_inode = d_inode(old_dentry);
 815         struct inode *new_inode = d_inode(new_dentry);
 816         struct inode *whiteout = NULL;
 817         struct page *old_dir_page;
 818         struct page *old_page, *new_page = NULL;
 819         struct f2fs_dir_entry *old_dir_entry = NULL;
 820         struct f2fs_dir_entry *old_entry;
 821         struct f2fs_dir_entry *new_entry;
 822         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 823         int err = -ENOENT;
 824
 825         if (unlikely(f2fs_cp_error(sbi)))
 826                 return -EIO;
 827
 828         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 829                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 830                         F2FS_I(old_dentry->d_inode)->i_projid)))
 831                 return -EXDEV;
 832
 833         err = dquot_initialize(old_dir);
 834         if (err)
 835                 goto out;
 836
 837         err = dquot_initialize(new_dir);
 838         if (err)
 839                 goto out;
 840
 841         if (new_inode) {
 842                 err = dquot_initialize(new_inode);
 843                 if (err)
 844                         goto out;
 845         }
 846
 847         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 848         if (!old_entry) {
 849                 if (IS_ERR(old_page))
 850                         err = PTR_ERR(old_page);
 851                 goto out;
 852         }
 853
 854         if (S_ISDIR(old_inode->i_mode)) {
 855                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 856                 if (!old_dir_entry) {
 857                         if (IS_ERR(old_dir_page))
 858                                 err = PTR_ERR(old_dir_page);
 859                         goto out_old;
 860                 }
 861         }
 862
 863         if (flags & RENAME_WHITEOUT) {
 864                 err = f2fs_create_whiteout(old_dir, &whiteout);
 865                 if (err)
 866                         goto out_dir;
 867         }
 868
 869         if (new_inode) {
 870
 871                 err = -ENOTEMPTY;
 872                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 873                         goto out_whiteout;
 874
 875                 err = -ENOENT;
 876                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 877                                                 &new_page);
 878                 if (!new_entry) {
 879                         if (IS_ERR(new_page))
 880                                 err = PTR_ERR(new_page);
 881                         goto out_whiteout;
 882                 }
 883
 884                 f2fs_balance_fs(sbi, true);
 885
 886                 f2fs_lock_op(sbi);
 887
 888                 err = acquire_orphan_inode(sbi);
 889                 if (err)
 890                         goto put_out_dir;
 891
 892                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 893
 894                 new_inode->i_ctime = current_time(new_inode);
 895                 down_write(&F2FS_I(new_inode)->i_sem);
 896                 if (old_dir_entry)
 897                         f2fs_i_links_write(new_inode, false);
 898                 f2fs_i_links_write(new_inode, false);
 899                 up_write(&F2FS_I(new_inode)->i_sem);
 900
 901                 if (!new_inode->i_nlink)
 902                         add_orphan_inode(new_inode);
 903                 else
 904                         release_orphan_inode(sbi);
 905         } else {
 906                 f2fs_balance_fs(sbi, true);
 907
 908                 f2fs_lock_op(sbi);
 909
 910                 err = f2fs_add_link(new_dentry, old_inode);
 911                 if (err) {
 912                         f2fs_unlock_op(sbi);
 913                         goto out_whiteout;
 914                 }
 915
 916                 if (old_dir_entry)
 917                         f2fs_i_links_write(new_dir, true);
 918
 919                 /*
 920                  * old entry and new entry can locate in the same inline
 921                  * dentry in inode, when attaching new entry in inline dentry,
 922                  * it could force inline dentry conversion, after that,
 923                  * old_entry and old_page will point to wrong address, in
 924                  * order to avoid this, let's do the check and update here.
 925                  */
 926                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 927                         f2fs_put_page(old_page, 0);
 928                         old_page = NULL;
 929
 930                         old_entry = f2fs_find_entry(old_dir,
 931                                                 &old_dentry->d_name, &old_page);
 932                         if (!old_entry) {
 933                                 err = -ENOENT;
 934                                 if (IS_ERR(old_page))
 935                                         err = PTR_ERR(old_page);
 936                                 f2fs_unlock_op(sbi);
 937                                 goto out_whiteout;
 938                         }
 939                 }
 940         }
 941
 942         down_write(&F2FS_I(old_inode)->i_sem);
 943         if (!old_dir_entry || whiteout)
 944                 file_lost_pino(old_inode);
 945         else
 946                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 947         up_write(&F2FS_I(old_inode)->i_sem);
 948
 949         old_inode->i_ctime = current_time(old_inode);
 950         f2fs_mark_inode_dirty_sync(old_inode, false);
 951
 952         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 953
 954         if (whiteout) {
 955                 whiteout->i_state |= I_LINKABLE;
 956                 set_inode_flag(whiteout, FI_INC_LINK);
 957                 err = f2fs_add_link(old_dentry, whiteout);
 958                 if (err)
 959                         goto put_out_dir;
 960                 whiteout->i_state &= ~I_LINKABLE;
 961                 iput(whiteout);
 962         }
 963
 964         if (old_dir_entry) {
 965                 if (old_dir != new_dir && !whiteout)
 966                         f2fs_set_link(old_inode, old_dir_entry,
 967                                                 old_dir_page, new_dir);
 968                 else
 969                         f2fs_put_page(old_dir_page, 0);
 970                 f2fs_i_links_write(old_dir, false);
 971         }
 972         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
 973                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 974
 975         f2fs_unlock_op(sbi);
 976
 977         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 978                 f2fs_sync_fs(sbi->sb, 1);
 979         return 0;
 980
 981 put_out_dir:
 982         f2fs_unlock_op(sbi);
 983         if (new_page)
 984                 f2fs_put_page(new_page, 0);
 985 out_whiteout:
 986         if (whiteout)
 987                 iput(whiteout);
 988 out_dir:
 989         if (old_dir_entry)
 990                 f2fs_put_page(old_dir_page, 0);
 991 out_old:
 992         f2fs_put_page(old_page, 0);
 993 out:
 994         return err;
 995 }
 996
 997 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 998                              struct inode *new_dir, struct dentry *new_dentry)
 999 {
1000         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1001         struct inode *old_inode = d_inode(old_dentry);
1002         struct inode *new_inode = d_inode(new_dentry);
1003         struct page *old_dir_page, *new_dir_page;
1004         struct page *old_page, *new_page;
1005         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1006         struct f2fs_dir_entry *old_entry, *new_entry;
1007         int old_nlink = 0, new_nlink = 0;
1008         int err = -ENOENT;
1009
1010         if (unlikely(f2fs_cp_error(sbi)))
1011                 return -EIO;
1012
1013         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1014                         !projid_eq(F2FS_I(new_dir)->i_projid,
1015                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1016             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1017                         !projid_eq(F2FS_I(old_dir)->i_projid,
1018                         F2FS_I(new_dentry->d_inode)->i_projid)))
1019                 return -EXDEV;
1020
1021         err = dquot_initialize(old_dir);
1022         if (err)
1023                 goto out;
1024
1025         err = dquot_initialize(new_dir);
1026         if (err)
1027                 goto out;
1028
1029         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1030         if (!old_entry) {
1031                 if (IS_ERR(old_page))
1032                         err = PTR_ERR(old_page);
1033                 goto out;
1034         }
1035
1036         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1037         if (!new_entry) {
1038                 if (IS_ERR(new_page))
1039                         err = PTR_ERR(new_page);
1040                 goto out_old;
1041         }
1042
1043         /* prepare for updating ".." directory entry info later */
1044         if (old_dir != new_dir) {
1045                 if (S_ISDIR(old_inode->i_mode)) {
1046                         old_dir_entry = f2fs_parent_dir(old_inode,
1047                                                         &old_dir_page);
1048                         if (!old_dir_entry) {
1049                                 if (IS_ERR(old_dir_page))
1050                                         err = PTR_ERR(old_dir_page);
1051                                 goto out_new;
1052                         }
1053                 }
1054
1055                 if (S_ISDIR(new_inode->i_mode)) {
1056                         new_dir_entry = f2fs_parent_dir(new_inode,
1057                                                         &new_dir_page);
1058                         if (!new_dir_entry) {
1059                                 if (IS_ERR(new_dir_page))
1060                                         err = PTR_ERR(new_dir_page);
1061                                 goto out_old_dir;
1062                         }
1063                 }
1064         }
1065
1066         /*
1067          * If cross rename between file and directory those are not
1068          * in the same directory, we will inc nlink of file's parent
1069          * later, so we should check upper boundary of its nlink.
1070          */
1071         if ((!old_dir_entry || !new_dir_entry) &&
1072                                 old_dir_entry != new_dir_entry) {
1073                 old_nlink = old_dir_entry ? -1 : 1;
1074                 new_nlink = -old_nlink;
1075                 err = -EMLINK;
1076                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1077                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1078                         goto out_new_dir;
1079         }
1080
1081         f2fs_balance_fs(sbi, true);
1082
1083         f2fs_lock_op(sbi);
1084
1085         /* update ".." directory entry info of old dentry */
1086         if (old_dir_entry)
1087                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1088
1089         /* update ".." directory entry info of new dentry */
1090         if (new_dir_entry)
1091                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1092
1093         /* update directory entry info of old dir inode */
1094         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1095
1096         down_write(&F2FS_I(old_inode)->i_sem);
1097         file_lost_pino(old_inode);
1098         up_write(&F2FS_I(old_inode)->i_sem);
1099
1100         old_dir->i_ctime = current_time(old_dir);
1101         if (old_nlink) {
1102                 down_write(&F2FS_I(old_dir)->i_sem);
1103                 f2fs_i_links_write(old_dir, old_nlink > 0);
1104                 up_write(&F2FS_I(old_dir)->i_sem);
1105         }
1106         f2fs_mark_inode_dirty_sync(old_dir, false);
1107
1108         /* update directory entry info of new dir inode */
1109         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1110
1111         down_write(&F2FS_I(new_inode)->i_sem);
1112         file_lost_pino(new_inode);
1113         up_write(&F2FS_I(new_inode)->i_sem);
1114
1115         new_dir->i_ctime = current_time(new_dir);
1116         if (new_nlink) {
1117                 down_write(&F2FS_I(new_dir)->i_sem);
1118                 f2fs_i_links_write(new_dir, new_nlink > 0);
1119                 up_write(&F2FS_I(new_dir)->i_sem);
1120         }
1121         f2fs_mark_inode_dirty_sync(new_dir, false);
1122
1123         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1124                 add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1125                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1126         }
1127
1128         f2fs_unlock_op(sbi);
1129
1130         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1131                 f2fs_sync_fs(sbi->sb, 1);
1132         return 0;
1133 out_new_dir:
1134         if (new_dir_entry) {
1135                 f2fs_put_page(new_dir_page, 0);
1136         }
1137 out_old_dir:
1138         if (old_dir_entry) {
1139                 f2fs_put_page(old_dir_page, 0);
1140         }
1141 out_new:
1142         f2fs_put_page(new_page, 0);
1143 out_old:
1144         f2fs_put_page(old_page, 0);
1145 out:
1146         return err;
1147 }
1148
1149 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1150                         struct inode *new_dir, struct dentry *new_dentry,
1151                         unsigned int flags)
1152 {
1153         int err;
1154
1155         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1156                 return -EINVAL;
1157
1158         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1159                                      flags);
1160         if (err)
1161                 return err;
1162
1163         if (flags & RENAME_EXCHANGE) {
1164                 return f2fs_cross_rename(old_dir, old_dentry,
1165                                          new_dir, new_dentry);
1166         }
1167         /*
1168          * VFS has already handled the new dentry existence case,
1169          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1170          */
1171         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1172 }
1173
1174 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1175                                            struct inode *inode,
1176                                            struct delayed_call *done)
1177 {
1178         struct page *page;
1179         const char *target;
1180
1181         if (!dentry)
1182                 return ERR_PTR(-ECHILD);
1183
1184         page = read_mapping_page(inode->i_mapping, 0, NULL);
1185         if (IS_ERR(page))
1186                 return ERR_CAST(page);
1187
1188         target = fscrypt_get_symlink(inode, page_address(page),
1189                                      inode->i_sb->s_blocksize, done);
1190         put_page(page);
1191         return target;
1192 }
1193
1194 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1195         .get_link       = f2fs_encrypted_get_link,
1196         .getattr        = f2fs_getattr,
1197         .setattr        = f2fs_setattr,
1198 #ifdef CONFIG_F2FS_FS_XATTR
1199         .listxattr      = f2fs_listxattr,
1200 #endif
1201 };
1202
1203 const struct inode_operations f2fs_dir_inode_operations = {
1204         .create         = f2fs_create,
1205         .lookup         = f2fs_lookup,
1206         .link           = f2fs_link,
1207         .unlink         = f2fs_unlink,
1208         .symlink        = f2fs_symlink,
1209         .mkdir          = f2fs_mkdir,
1210         .rmdir          = f2fs_rmdir,
1211         .mknod          = f2fs_mknod,
1212         .rename         = f2fs_rename2,
1213         .tmpfile        = f2fs_tmpfile,
1214         .getattr        = f2fs_getattr,
1215         .setattr        = f2fs_setattr,
1216         .get_acl        = f2fs_get_acl,
1217         .set_acl        = f2fs_set_acl,
1218 #ifdef CONFIG_F2FS_FS_XATTR
1219         .listxattr      = f2fs_listxattr,
1220 #endif
1221 };
1222
1223 const struct inode_operations f2fs_symlink_inode_operations = {
1224         .get_link       = f2fs_get_link,
1225         .getattr        = f2fs_getattr,
1226         .setattr        = f2fs_setattr,
1227 #ifdef CONFIG_F2FS_FS_XATTR
1228         .listxattr      = f2fs_listxattr,
1229 #endif
1230 };
1231
1232 const struct inode_operations f2fs_special_inode_operations = {
1233         .getattr        = f2fs_getattr,
1234         .setattr        = f2fs_setattr,
1235         .get_acl        = f2fs_get_acl,
1236         .set_acl        = f2fs_set_acl,
1237 #ifdef CONFIG_F2FS_FS_XATTR
1238         .listxattr      = f2fs_listxattr,
1239 #endif
1240 };