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(dentry, inode);
 298         unlock_new_inode(inode);
 299
 300         if (IS_DIRSYNC(dir))
 301                 f2fs_sync_fs(sbi->sb, 1);
 302
 303         f2fs_balance_fs(sbi, true);
 304         return 0;
 305 out:
 306         handle_failed_inode(inode);
 307         return err;
 308 }
 309
 310 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 311                 struct dentry *dentry)
 312 {
 313         struct inode *inode = d_inode(old_dentry);
 314         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 315         int err;
 316
 317         if (unlikely(f2fs_cp_error(sbi)))
 318                 return -EIO;
 319
 320         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 321         if (err)
 322                 return err;
 323
 324         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 325                         (!projid_eq(F2FS_I(dir)->i_projid,
 326                         F2FS_I(old_dentry->d_inode)->i_projid)))
 327                 return -EXDEV;
 328
 329         err = dquot_initialize(dir);
 330         if (err)
 331                 return err;
 332
 333         f2fs_balance_fs(sbi, true);
 334
 335         inode->i_ctime = current_time(inode);
 336         ihold(inode);
 337
 338         set_inode_flag(inode, FI_INC_LINK);
 339         f2fs_lock_op(sbi);
 340         err = f2fs_add_link(dentry, inode);
 341         if (err)
 342                 goto out;
 343         f2fs_unlock_op(sbi);
 344
 345         d_instantiate(dentry, inode);
 346
 347         if (IS_DIRSYNC(dir))
 348                 f2fs_sync_fs(sbi->sb, 1);
 349         return 0;
 350 out:
 351         clear_inode_flag(inode, FI_INC_LINK);
 352         iput(inode);
 353         f2fs_unlock_op(sbi);
 354         return err;
 355 }
 356
 357 struct dentry *f2fs_get_parent(struct dentry *child)
 358 {
 359         struct qstr dotdot = QSTR_INIT("..", 2);
 360         struct page *page;
 361         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 362         if (!ino) {
 363                 if (IS_ERR(page))
 364                         return ERR_CAST(page);
 365                 return ERR_PTR(-ENOENT);
 366         }
 367         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 368 }
 369
 370 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 371 {
 372         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 373         struct qstr dot = QSTR_INIT(".", 1);
 374         struct qstr dotdot = QSTR_INIT("..", 2);
 375         struct f2fs_dir_entry *de;
 376         struct page *page;
 377         int err = 0;
 378
 379         if (f2fs_readonly(sbi->sb)) {
 380                 f2fs_msg(sbi->sb, KERN_INFO,
 381                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 382                         "in readonly mountpoint", dir->i_ino, pino);
 383                 return 0;
 384         }
 385
 386         err = dquot_initialize(dir);
 387         if (err)
 388                 return err;
 389
 390         f2fs_balance_fs(sbi, true);
 391
 392         f2fs_lock_op(sbi);
 393
 394         de = f2fs_find_entry(dir, &dot, &page);
 395         if (de) {
 396                 f2fs_put_page(page, 0);
 397         } else if (IS_ERR(page)) {
 398                 err = PTR_ERR(page);
 399                 goto out;
 400         } else {
 401                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 402                 if (err)
 403                         goto out;
 404         }
 405
 406         de = f2fs_find_entry(dir, &dotdot, &page);
 407         if (de)
 408                 f2fs_put_page(page, 0);
 409         else if (IS_ERR(page))
 410                 err = PTR_ERR(page);
 411         else
 412                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 413 out:
 414         if (!err)
 415                 clear_inode_flag(dir, FI_INLINE_DOTS);
 416
 417         f2fs_unlock_op(sbi);
 418         return err;
 419 }
 420
 421 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 422                 unsigned int flags)
 423 {
 424         struct inode *inode = NULL;
 425         struct f2fs_dir_entry *de;
 426         struct page *page;
 427         struct dentry *new;
 428         nid_t ino = -1;
 429         int err = 0;
 430         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 431
 432         trace_f2fs_lookup_start(dir, dentry, flags);
 433
 434         err = fscrypt_prepare_lookup(dir, dentry, flags);
 435         if (err)
 436                 goto out;
 437
 438         if (dentry->d_name.len > F2FS_NAME_LEN) {
 439                 err = -ENAMETOOLONG;
 440                 goto out;
 441         }
 442
 443         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 444         if (!de) {
 445                 if (IS_ERR(page)) {
 446                         err = PTR_ERR(page);
 447                         goto out;
 448                 }
 449                 goto out_splice;
 450         }
 451
 452         ino = le32_to_cpu(de->ino);
 453         f2fs_put_page(page, 0);
 454
 455         inode = f2fs_iget(dir->i_sb, ino);
 456         if (IS_ERR(inode)) {
 457                 err = PTR_ERR(inode);
 458                 goto out;
 459         }
 460
 461         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 462                 err = __recover_dot_dentries(dir, root_ino);
 463                 if (err)
 464                         goto out_iput;
 465         }
 466
 467         if (f2fs_has_inline_dots(inode)) {
 468                 err = __recover_dot_dentries(inode, dir->i_ino);
 469                 if (err)
 470                         goto out_iput;
 471         }
 472         if (f2fs_encrypted_inode(dir) &&
 473             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 474             !fscrypt_has_permitted_context(dir, inode)) {
 475                 f2fs_msg(inode->i_sb, KERN_WARNING,
 476                          "Inconsistent encryption contexts: %lu/%lu",
 477                          dir->i_ino, inode->i_ino);
 478                 err = -EPERM;
 479                 goto out_iput;
 480         }
 481 out_splice:
 482         new = d_splice_alias(inode, dentry);
 483         if (IS_ERR(new))
 484                 err = PTR_ERR(new);
 485         trace_f2fs_lookup_end(dir, dentry, ino, err);
 486         return new;
 487 out_iput:
 488         iput(inode);
 489 out:
 490         trace_f2fs_lookup_end(dir, dentry, ino, err);
 491         return ERR_PTR(err);
 492 }
 493
 494 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 495 {
 496         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 497         struct inode *inode = d_inode(dentry);
 498         struct f2fs_dir_entry *de;
 499         struct page *page;
 500         int err = -ENOENT;
 501
 502         trace_f2fs_unlink_enter(dir, dentry);
 503
 504         if (unlikely(f2fs_cp_error(sbi)))
 505                 return -EIO;
 506
 507         err = dquot_initialize(dir);
 508         if (err)
 509                 return err;
 510         err = dquot_initialize(inode);
 511         if (err)
 512                 return err;
 513
 514         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 515         if (!de) {
 516                 if (IS_ERR(page))
 517                         err = PTR_ERR(page);
 518                 goto fail;
 519         }
 520
 521         f2fs_balance_fs(sbi, true);
 522
 523         f2fs_lock_op(sbi);
 524         err = acquire_orphan_inode(sbi);
 525         if (err) {
 526                 f2fs_unlock_op(sbi);
 527                 f2fs_put_page(page, 0);
 528                 goto fail;
 529         }
 530         f2fs_delete_entry(de, page, dir, inode);
 531         f2fs_unlock_op(sbi);
 532
 533         if (IS_DIRSYNC(dir))
 534                 f2fs_sync_fs(sbi->sb, 1);
 535 fail:
 536         trace_f2fs_unlink_exit(inode, err);
 537         return err;
 538 }
 539
 540 static const char *f2fs_get_link(struct dentry *dentry,
 541                                  struct inode *inode,
 542                                  struct delayed_call *done)
 543 {
 544         const char *link = page_get_link(dentry, inode, done);
 545         if (!IS_ERR(link) && !*link) {
 546                 /* this is broken symlink case */
 547                 do_delayed_call(done);
 548                 clear_delayed_call(done);
 549                 link = ERR_PTR(-ENOENT);
 550         }
 551         return link;
 552 }
 553
 554 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 555                                         const char *symname)
 556 {
 557         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 558         struct inode *inode;
 559         size_t len = strlen(symname);
 560         struct fscrypt_str disk_link;
 561         int err;
 562
 563         if (unlikely(f2fs_cp_error(sbi)))
 564                 return -EIO;
 565
 566         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 567                                       &disk_link);
 568         if (err)
 569                 return err;
 570
 571         err = dquot_initialize(dir);
 572         if (err)
 573                 return err;
 574
 575         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 576         if (IS_ERR(inode))
 577                 return PTR_ERR(inode);
 578
 579         if (IS_ENCRYPTED(inode))
 580                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 581         else
 582                 inode->i_op = &f2fs_symlink_inode_operations;
 583         inode_nohighmem(inode);
 584         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 585
 586         f2fs_lock_op(sbi);
 587         err = f2fs_add_link(dentry, inode);
 588         if (err)
 589                 goto out_handle_failed_inode;
 590         f2fs_unlock_op(sbi);
 591         alloc_nid_done(sbi, inode->i_ino);
 592
 593         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 594         if (err)
 595                 goto err_out;
 596
 597         err = page_symlink(inode, disk_link.name, disk_link.len);
 598
 599 err_out:
 600         d_instantiate(dentry, inode);
 601         unlock_new_inode(inode);
 602
 603         /*
 604          * Let's flush symlink data in order to avoid broken symlink as much as
 605          * possible. Nevertheless, fsyncing is the best way, but there is no
 606          * way to get a file descriptor in order to flush that.
 607          *
 608          * Note that, it needs to do dir->fsync to make this recoverable.
 609          * If the symlink path is stored into inline_data, there is no
 610          * performance regression.
 611          */
 612         if (!err) {
 613                 filemap_write_and_wait_range(inode->i_mapping, 0,
 614                                                         disk_link.len - 1);
 615
 616                 if (IS_DIRSYNC(dir))
 617                         f2fs_sync_fs(sbi->sb, 1);
 618         } else {
 619                 f2fs_unlink(dir, dentry);
 620         }
 621
 622         f2fs_balance_fs(sbi, true);
 623         goto out_free_encrypted_link;
 624
 625 out_handle_failed_inode:
 626         handle_failed_inode(inode);
 627 out_free_encrypted_link:
 628         if (disk_link.name != (unsigned char *)symname)
 629                 kfree(disk_link.name);
 630         return err;
 631 }
 632
 633 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 634 {
 635         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 636         struct inode *inode;
 637         int err;
 638
 639         if (unlikely(f2fs_cp_error(sbi)))
 640                 return -EIO;
 641
 642         err = dquot_initialize(dir);
 643         if (err)
 644                 return err;
 645
 646         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 647         if (IS_ERR(inode))
 648                 return PTR_ERR(inode);
 649
 650         inode->i_op = &f2fs_dir_inode_operations;
 651         inode->i_fop = &f2fs_dir_operations;
 652         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 653         inode_nohighmem(inode);
 654
 655         set_inode_flag(inode, FI_INC_LINK);
 656         f2fs_lock_op(sbi);
 657         err = f2fs_add_link(dentry, inode);
 658         if (err)
 659                 goto out_fail;
 660         f2fs_unlock_op(sbi);
 661
 662         alloc_nid_done(sbi, inode->i_ino);
 663
 664         d_instantiate(dentry, inode);
 665         unlock_new_inode(inode);
 666
 667         if (IS_DIRSYNC(dir))
 668                 f2fs_sync_fs(sbi->sb, 1);
 669
 670         f2fs_balance_fs(sbi, true);
 671         return 0;
 672
 673 out_fail:
 674         clear_inode_flag(inode, FI_INC_LINK);
 675         handle_failed_inode(inode);
 676         return err;
 677 }
 678
 679 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 680 {
 681         struct inode *inode = d_inode(dentry);
 682         if (f2fs_empty_dir(inode))
 683                 return f2fs_unlink(dir, dentry);
 684         return -ENOTEMPTY;
 685 }
 686
 687 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 688                                 umode_t mode, dev_t rdev)
 689 {
 690         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 691         struct inode *inode;
 692         int err = 0;
 693
 694         if (unlikely(f2fs_cp_error(sbi)))
 695                 return -EIO;
 696
 697         err = dquot_initialize(dir);
 698         if (err)
 699                 return err;
 700
 701         inode = f2fs_new_inode(dir, mode);
 702         if (IS_ERR(inode))
 703                 return PTR_ERR(inode);
 704
 705         init_special_inode(inode, inode->i_mode, rdev);
 706         inode->i_op = &f2fs_special_inode_operations;
 707
 708         f2fs_lock_op(sbi);
 709         err = f2fs_add_link(dentry, inode);
 710         if (err)
 711                 goto out;
 712         f2fs_unlock_op(sbi);
 713
 714         alloc_nid_done(sbi, inode->i_ino);
 715
 716         d_instantiate(dentry, inode);
 717         unlock_new_inode(inode);
 718
 719         if (IS_DIRSYNC(dir))
 720                 f2fs_sync_fs(sbi->sb, 1);
 721
 722         f2fs_balance_fs(sbi, true);
 723         return 0;
 724 out:
 725         handle_failed_inode(inode);
 726         return err;
 727 }
 728
 729 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 730                                         umode_t mode, struct inode **whiteout)
 731 {
 732         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 733         struct inode *inode;
 734         int err;
 735
 736         err = dquot_initialize(dir);
 737         if (err)
 738                 return err;
 739
 740         inode = f2fs_new_inode(dir, mode);
 741         if (IS_ERR(inode))
 742                 return PTR_ERR(inode);
 743
 744         if (whiteout) {
 745                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 746                 inode->i_op = &f2fs_special_inode_operations;
 747         } else {
 748                 inode->i_op = &f2fs_file_inode_operations;
 749                 inode->i_fop = &f2fs_file_operations;
 750                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 751         }
 752
 753         f2fs_lock_op(sbi);
 754         err = acquire_orphan_inode(sbi);
 755         if (err)
 756                 goto out;
 757
 758         err = f2fs_do_tmpfile(inode, dir);
 759         if (err)
 760                 goto release_out;
 761
 762         /*
 763          * add this non-linked tmpfile to orphan list, in this way we could
 764          * remove all unused data of tmpfile after abnormal power-off.
 765          */
 766         add_orphan_inode(inode);
 767         alloc_nid_done(sbi, inode->i_ino);
 768
 769         if (whiteout) {
 770                 f2fs_i_links_write(inode, false);
 771                 *whiteout = inode;
 772         } else {
 773                 d_tmpfile(dentry, inode);
 774         }
 775         /* link_count was changed by d_tmpfile as well. */
 776         f2fs_unlock_op(sbi);
 777         unlock_new_inode(inode);
 778
 779         f2fs_balance_fs(sbi, true);
 780         return 0;
 781
 782 release_out:
 783         release_orphan_inode(sbi);
 784 out:
 785         handle_failed_inode(inode);
 786         return err;
 787 }
 788
 789 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 790 {
 791         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 792
 793         if (unlikely(f2fs_cp_error(sbi)))
 794                 return -EIO;
 795
 796         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 797                 int err = fscrypt_get_encryption_info(dir);
 798                 if (err)
 799                         return err;
 800         }
 801
 802         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 803 }
 804
 805 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 806 {
 807         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 808                 return -EIO;
 809
 810         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 811 }
 812
 813 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 814                         struct inode *new_dir, struct dentry *new_dentry,
 815                         unsigned int flags)
 816 {
 817         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 818         struct inode *old_inode = d_inode(old_dentry);
 819         struct inode *new_inode = d_inode(new_dentry);
 820         struct inode *whiteout = NULL;
 821         struct page *old_dir_page;
 822         struct page *old_page, *new_page = NULL;
 823         struct f2fs_dir_entry *old_dir_entry = NULL;
 824         struct f2fs_dir_entry *old_entry;
 825         struct f2fs_dir_entry *new_entry;
 826         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 827         int err = -ENOENT;
 828
 829         if (unlikely(f2fs_cp_error(sbi)))
 830                 return -EIO;
 831
 832         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 833                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 834                         F2FS_I(old_dentry->d_inode)->i_projid)))
 835                 return -EXDEV;
 836
 837         err = dquot_initialize(old_dir);
 838         if (err)
 839                 goto out;
 840
 841         err = dquot_initialize(new_dir);
 842         if (err)
 843                 goto out;
 844
 845         if (new_inode) {
 846                 err = dquot_initialize(new_inode);
 847                 if (err)
 848                         goto out;
 849         }
 850
 851         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 852         if (!old_entry) {
 853                 if (IS_ERR(old_page))
 854                         err = PTR_ERR(old_page);
 855                 goto out;
 856         }
 857
 858         if (S_ISDIR(old_inode->i_mode)) {
 859                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 860                 if (!old_dir_entry) {
 861                         if (IS_ERR(old_dir_page))
 862                                 err = PTR_ERR(old_dir_page);
 863                         goto out_old;
 864                 }
 865         }
 866
 867         if (flags & RENAME_WHITEOUT) {
 868                 err = f2fs_create_whiteout(old_dir, &whiteout);
 869                 if (err)
 870                         goto out_dir;
 871         }
 872
 873         if (new_inode) {
 874
 875                 err = -ENOTEMPTY;
 876                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 877                         goto out_whiteout;
 878
 879                 err = -ENOENT;
 880                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 881                                                 &new_page);
 882                 if (!new_entry) {
 883                         if (IS_ERR(new_page))
 884                                 err = PTR_ERR(new_page);
 885                         goto out_whiteout;
 886                 }
 887
 888                 f2fs_balance_fs(sbi, true);
 889
 890                 f2fs_lock_op(sbi);
 891
 892                 err = acquire_orphan_inode(sbi);
 893                 if (err)
 894                         goto put_out_dir;
 895
 896                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 897
 898                 new_inode->i_ctime = current_time(new_inode);
 899                 down_write(&F2FS_I(new_inode)->i_sem);
 900                 if (old_dir_entry)
 901                         f2fs_i_links_write(new_inode, false);
 902                 f2fs_i_links_write(new_inode, false);
 903                 up_write(&F2FS_I(new_inode)->i_sem);
 904
 905                 if (!new_inode->i_nlink)
 906                         add_orphan_inode(new_inode);
 907                 else
 908                         release_orphan_inode(sbi);
 909         } else {
 910                 f2fs_balance_fs(sbi, true);
 911
 912                 f2fs_lock_op(sbi);
 913
 914                 err = f2fs_add_link(new_dentry, old_inode);
 915                 if (err) {
 916                         f2fs_unlock_op(sbi);
 917                         goto out_whiteout;
 918                 }
 919
 920                 if (old_dir_entry)
 921                         f2fs_i_links_write(new_dir, true);
 922
 923                 /*
 924                  * old entry and new entry can locate in the same inline
 925                  * dentry in inode, when attaching new entry in inline dentry,
 926                  * it could force inline dentry conversion, after that,
 927                  * old_entry and old_page will point to wrong address, in
 928                  * order to avoid this, let's do the check and update here.
 929                  */
 930                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 931                         f2fs_put_page(old_page, 0);
 932                         old_page = NULL;
 933
 934                         old_entry = f2fs_find_entry(old_dir,
 935                                                 &old_dentry->d_name, &old_page);
 936                         if (!old_entry) {
 937                                 err = -ENOENT;
 938                                 if (IS_ERR(old_page))
 939                                         err = PTR_ERR(old_page);
 940                                 f2fs_unlock_op(sbi);
 941                                 goto out_whiteout;
 942                         }
 943                 }
 944         }
 945
 946         down_write(&F2FS_I(old_inode)->i_sem);
 947         if (!old_dir_entry || whiteout)
 948                 file_lost_pino(old_inode);
 949         else
 950                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 951         up_write(&F2FS_I(old_inode)->i_sem);
 952
 953         old_inode->i_ctime = current_time(old_inode);
 954         f2fs_mark_inode_dirty_sync(old_inode, false);
 955
 956         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 957
 958         if (whiteout) {
 959                 whiteout->i_state |= I_LINKABLE;
 960                 set_inode_flag(whiteout, FI_INC_LINK);
 961                 err = f2fs_add_link(old_dentry, whiteout);
 962                 if (err)
 963                         goto put_out_dir;
 964                 whiteout->i_state &= ~I_LINKABLE;
 965                 iput(whiteout);
 966         }
 967
 968         if (old_dir_entry) {
 969                 if (old_dir != new_dir && !whiteout)
 970                         f2fs_set_link(old_inode, old_dir_entry,
 971                                                 old_dir_page, new_dir);
 972                 else
 973                         f2fs_put_page(old_dir_page, 0);
 974                 f2fs_i_links_write(old_dir, false);
 975         }
 976         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
 977                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 978
 979         f2fs_unlock_op(sbi);
 980
 981         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 982                 f2fs_sync_fs(sbi->sb, 1);
 983         return 0;
 984
 985 put_out_dir:
 986         f2fs_unlock_op(sbi);
 987         if (new_page)
 988                 f2fs_put_page(new_page, 0);
 989 out_whiteout:
 990         if (whiteout)
 991                 iput(whiteout);
 992 out_dir:
 993         if (old_dir_entry)
 994                 f2fs_put_page(old_dir_page, 0);
 995 out_old:
 996         f2fs_put_page(old_page, 0);
 997 out:
 998         return err;
 999 }
1000
1001 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1002                              struct inode *new_dir, struct dentry *new_dentry)
1003 {
1004         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1005         struct inode *old_inode = d_inode(old_dentry);
1006         struct inode *new_inode = d_inode(new_dentry);
1007         struct page *old_dir_page, *new_dir_page;
1008         struct page *old_page, *new_page;
1009         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1010         struct f2fs_dir_entry *old_entry, *new_entry;
1011         int old_nlink = 0, new_nlink = 0;
1012         int err = -ENOENT;
1013
1014         if (unlikely(f2fs_cp_error(sbi)))
1015                 return -EIO;
1016
1017         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1018                         !projid_eq(F2FS_I(new_dir)->i_projid,
1019                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1020             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1021                         !projid_eq(F2FS_I(old_dir)->i_projid,
1022                         F2FS_I(new_dentry->d_inode)->i_projid)))
1023                 return -EXDEV;
1024
1025         err = dquot_initialize(old_dir);
1026         if (err)
1027                 goto out;
1028
1029         err = dquot_initialize(new_dir);
1030         if (err)
1031                 goto out;
1032
1033         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1034         if (!old_entry) {
1035                 if (IS_ERR(old_page))
1036                         err = PTR_ERR(old_page);
1037                 goto out;
1038         }
1039
1040         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1041         if (!new_entry) {
1042                 if (IS_ERR(new_page))
1043                         err = PTR_ERR(new_page);
1044                 goto out_old;
1045         }
1046
1047         /* prepare for updating ".." directory entry info later */
1048         if (old_dir != new_dir) {
1049                 if (S_ISDIR(old_inode->i_mode)) {
1050                         old_dir_entry = f2fs_parent_dir(old_inode,
1051                                                         &old_dir_page);
1052                         if (!old_dir_entry) {
1053                                 if (IS_ERR(old_dir_page))
1054                                         err = PTR_ERR(old_dir_page);
1055                                 goto out_new;
1056                         }
1057                 }
1058
1059                 if (S_ISDIR(new_inode->i_mode)) {
1060                         new_dir_entry = f2fs_parent_dir(new_inode,
1061                                                         &new_dir_page);
1062                         if (!new_dir_entry) {
1063                                 if (IS_ERR(new_dir_page))
1064                                         err = PTR_ERR(new_dir_page);
1065                                 goto out_old_dir;
1066                         }
1067                 }
1068         }
1069
1070         /*
1071          * If cross rename between file and directory those are not
1072          * in the same directory, we will inc nlink of file's parent
1073          * later, so we should check upper boundary of its nlink.
1074          */
1075         if ((!old_dir_entry || !new_dir_entry) &&
1076                                 old_dir_entry != new_dir_entry) {
1077                 old_nlink = old_dir_entry ? -1 : 1;
1078                 new_nlink = -old_nlink;
1079                 err = -EMLINK;
1080                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1081                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1082                         goto out_new_dir;
1083         }
1084
1085         f2fs_balance_fs(sbi, true);
1086
1087         f2fs_lock_op(sbi);
1088
1089         /* update ".." directory entry info of old dentry */
1090         if (old_dir_entry)
1091                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1092
1093         /* update ".." directory entry info of new dentry */
1094         if (new_dir_entry)
1095                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1096
1097         /* update directory entry info of old dir inode */
1098         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1099
1100         down_write(&F2FS_I(old_inode)->i_sem);
1101         file_lost_pino(old_inode);
1102         up_write(&F2FS_I(old_inode)->i_sem);
1103
1104         old_dir->i_ctime = current_time(old_dir);
1105         if (old_nlink) {
1106                 down_write(&F2FS_I(old_dir)->i_sem);
1107                 f2fs_i_links_write(old_dir, old_nlink > 0);
1108                 up_write(&F2FS_I(old_dir)->i_sem);
1109         }
1110         f2fs_mark_inode_dirty_sync(old_dir, false);
1111
1112         /* update directory entry info of new dir inode */
1113         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1114
1115         down_write(&F2FS_I(new_inode)->i_sem);
1116         file_lost_pino(new_inode);
1117         up_write(&F2FS_I(new_inode)->i_sem);
1118
1119         new_dir->i_ctime = current_time(new_dir);
1120         if (new_nlink) {
1121                 down_write(&F2FS_I(new_dir)->i_sem);
1122                 f2fs_i_links_write(new_dir, new_nlink > 0);
1123                 up_write(&F2FS_I(new_dir)->i_sem);
1124         }
1125         f2fs_mark_inode_dirty_sync(new_dir, false);
1126
1127         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1128                 add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1129                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1130         }
1131
1132         f2fs_unlock_op(sbi);
1133
1134         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1135                 f2fs_sync_fs(sbi->sb, 1);
1136         return 0;
1137 out_new_dir:
1138         if (new_dir_entry) {
1139                 f2fs_put_page(new_dir_page, 0);
1140         }
1141 out_old_dir:
1142         if (old_dir_entry) {
1143                 f2fs_put_page(old_dir_page, 0);
1144         }
1145 out_new:
1146         f2fs_put_page(new_page, 0);
1147 out_old:
1148         f2fs_put_page(old_page, 0);
1149 out:
1150         return err;
1151 }
1152
1153 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1154                         struct inode *new_dir, struct dentry *new_dentry,
1155                         unsigned int flags)
1156 {
1157         int err;
1158
1159         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1160                 return -EINVAL;
1161
1162         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1163                                      flags);
1164         if (err)
1165                 return err;
1166
1167         if (flags & RENAME_EXCHANGE) {
1168                 return f2fs_cross_rename(old_dir, old_dentry,
1169                                          new_dir, new_dentry);
1170         }
1171         /*
1172          * VFS has already handled the new dentry existence case,
1173          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1174          */
1175         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1176 }
1177
1178 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1179                                            struct inode *inode,
1180                                            struct delayed_call *done)
1181 {
1182         struct page *page;
1183         const char *target;
1184
1185         if (!dentry)
1186                 return ERR_PTR(-ECHILD);
1187
1188         page = read_mapping_page(inode->i_mapping, 0, NULL);
1189         if (IS_ERR(page))
1190                 return ERR_CAST(page);
1191
1192         target = fscrypt_get_symlink(inode, page_address(page),
1193                                      inode->i_sb->s_blocksize, done);
1194         put_page(page);
1195         return target;
1196 }
1197
1198 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1199         .get_link       = f2fs_encrypted_get_link,
1200         .getattr        = f2fs_getattr,
1201         .setattr        = f2fs_setattr,
1202 #ifdef CONFIG_F2FS_FS_XATTR
1203         .listxattr      = f2fs_listxattr,
1204 #endif
1205 };
1206
1207 const struct inode_operations f2fs_dir_inode_operations = {
1208         .create         = f2fs_create,
1209         .lookup         = f2fs_lookup,
1210         .link           = f2fs_link,
1211         .unlink         = f2fs_unlink,
1212         .symlink        = f2fs_symlink,
1213         .mkdir          = f2fs_mkdir,
1214         .rmdir          = f2fs_rmdir,
1215         .mknod          = f2fs_mknod,
1216         .rename         = f2fs_rename2,
1217         .tmpfile        = f2fs_tmpfile,
1218         .getattr        = f2fs_getattr,
1219         .setattr        = f2fs_setattr,
1220         .get_acl        = f2fs_get_acl,
1221         .set_acl        = f2fs_set_acl,
1222 #ifdef CONFIG_F2FS_FS_XATTR
1223         .listxattr      = f2fs_listxattr,
1224 #endif
1225 };
1226
1227 const struct inode_operations f2fs_symlink_inode_operations = {
1228         .get_link       = f2fs_get_link,
1229         .getattr        = f2fs_getattr,
1230         .setattr        = f2fs_setattr,
1231 #ifdef CONFIG_F2FS_FS_XATTR
1232         .listxattr      = f2fs_listxattr,
1233 #endif
1234 };
1235
1236 const struct inode_operations f2fs_special_inode_operations = {
1237         .getattr        = f2fs_getattr,
1238         .setattr        = f2fs_setattr,
1239         .get_acl        = f2fs_get_acl,
1240         .set_acl        = f2fs_set_acl,
1241 #ifdef CONFIG_F2FS_FS_XATTR
1242         .listxattr      = f2fs_listxattr,
1243 #endif
1244 };