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         unlock_new_inode(inode);
 298         d_instantiate(dentry, 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_follow_link(struct dentry *dentry, void **cookie)
 541 {
 542         const char *link = page_follow_link_light(dentry, cookie);
 543         if (!IS_ERR(link) && !*link) {
 544                 /* this is broken symlink case */
 545                 page_put_link(NULL, *cookie);
 546                 link = ERR_PTR(-ENOENT);
 547         }
 548         return link;
 549 }
 550
 551 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 552                                         const char *symname)
 553 {
 554         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 555         struct inode *inode;
 556         size_t len = strlen(symname);
 557         struct fscrypt_str disk_link;
 558         int err;
 559
 560         if (unlikely(f2fs_cp_error(sbi)))
 561                 return -EIO;
 562
 563         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 564                                       &disk_link);
 565         if (err)
 566                 return err;
 567
 568         err = dquot_initialize(dir);
 569         if (err)
 570                 return err;
 571
 572         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 573         if (IS_ERR(inode))
 574                 return PTR_ERR(inode);
 575
 576         if (IS_ENCRYPTED(inode))
 577                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 578         else
 579                 inode->i_op = &f2fs_symlink_inode_operations;
 580         inode_nohighmem(inode);
 581         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 582
 583         f2fs_lock_op(sbi);
 584         err = f2fs_add_link(dentry, inode);
 585         if (err)
 586                 goto out_handle_failed_inode;
 587         f2fs_unlock_op(sbi);
 588         alloc_nid_done(sbi, inode->i_ino);
 589
 590         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 591         if (err)
 592                 goto err_out;
 593
 594         err = page_symlink(inode, disk_link.name, disk_link.len);
 595
 596 err_out:
 597         unlock_new_inode(inode);
 598         d_instantiate(dentry, inode);
 599
 600         /*
 601          * Let's flush symlink data in order to avoid broken symlink as much as
 602          * possible. Nevertheless, fsyncing is the best way, but there is no
 603          * way to get a file descriptor in order to flush that.
 604          *
 605          * Note that, it needs to do dir->fsync to make this recoverable.
 606          * If the symlink path is stored into inline_data, there is no
 607          * performance regression.
 608          */
 609         if (!err) {
 610                 filemap_write_and_wait_range(inode->i_mapping, 0,
 611                                                         disk_link.len - 1);
 612
 613                 if (IS_DIRSYNC(dir))
 614                         f2fs_sync_fs(sbi->sb, 1);
 615         } else {
 616                 f2fs_unlink(dir, dentry);
 617         }
 618
 619         f2fs_balance_fs(sbi, true);
 620         goto out_free_encrypted_link;
 621
 622 out_handle_failed_inode:
 623         handle_failed_inode(inode);
 624 out_free_encrypted_link:
 625         if (disk_link.name != (unsigned char *)symname)
 626                 kfree(disk_link.name);
 627         return err;
 628 }
 629
 630 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 631 {
 632         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 633         struct inode *inode;
 634         int err;
 635
 636         if (unlikely(f2fs_cp_error(sbi)))
 637                 return -EIO;
 638
 639         err = dquot_initialize(dir);
 640         if (err)
 641                 return err;
 642
 643         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 644         if (IS_ERR(inode))
 645                 return PTR_ERR(inode);
 646
 647         inode->i_op = &f2fs_dir_inode_operations;
 648         inode->i_fop = &f2fs_dir_operations;
 649         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 650         inode_nohighmem(inode);
 651
 652         set_inode_flag(inode, FI_INC_LINK);
 653         f2fs_lock_op(sbi);
 654         err = f2fs_add_link(dentry, inode);
 655         if (err)
 656                 goto out_fail;
 657         f2fs_unlock_op(sbi);
 658
 659         alloc_nid_done(sbi, inode->i_ino);
 660
 661         unlock_new_inode(inode);
 662         d_instantiate(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         unlock_new_inode(inode);
 714         d_instantiate(dentry, inode);
 715
 716         if (IS_DIRSYNC(dir))
 717                 f2fs_sync_fs(sbi->sb, 1);
 718
 719         f2fs_balance_fs(sbi, true);
 720         return 0;
 721 out:
 722         handle_failed_inode(inode);
 723         return err;
 724 }
 725
 726 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 727                                         umode_t mode, struct inode **whiteout)
 728 {
 729         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 730         struct inode *inode;
 731         int err;
 732
 733         err = dquot_initialize(dir);
 734         if (err)
 735                 return err;
 736
 737         inode = f2fs_new_inode(dir, mode);
 738         if (IS_ERR(inode))
 739                 return PTR_ERR(inode);
 740
 741         if (whiteout) {
 742                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 743                 inode->i_op = &f2fs_special_inode_operations;
 744         } else {
 745                 inode->i_op = &f2fs_file_inode_operations;
 746                 inode->i_fop = &f2fs_file_operations;
 747                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 748         }
 749
 750         f2fs_lock_op(sbi);
 751         err = acquire_orphan_inode(sbi);
 752         if (err)
 753                 goto out;
 754
 755         err = f2fs_do_tmpfile(inode, dir);
 756         if (err)
 757                 goto release_out;
 758
 759         /*
 760          * add this non-linked tmpfile to orphan list, in this way we could
 761          * remove all unused data of tmpfile after abnormal power-off.
 762          */
 763         add_orphan_inode(inode);
 764         alloc_nid_done(sbi, inode->i_ino);
 765
 766         if (whiteout) {
 767                 f2fs_i_links_write(inode, false);
 768                 *whiteout = inode;
 769         } else {
 770                 d_tmpfile(dentry, inode);
 771         }
 772         /* link_count was changed by d_tmpfile as well. */
 773         f2fs_unlock_op(sbi);
 774         unlock_new_inode(inode);
 775
 776         f2fs_balance_fs(sbi, true);
 777         return 0;
 778
 779 release_out:
 780         release_orphan_inode(sbi);
 781 out:
 782         handle_failed_inode(inode);
 783         return err;
 784 }
 785
 786 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 787 {
 788         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 789
 790         if (unlikely(f2fs_cp_error(sbi)))
 791                 return -EIO;
 792
 793         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 794                 int err = fscrypt_get_encryption_info(dir);
 795                 if (err)
 796                         return err;
 797         }
 798
 799         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 800 }
 801
 802 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 803 {
 804         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 805                 return -EIO;
 806
 807         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 808 }
 809
 810 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 811                         struct inode *new_dir, struct dentry *new_dentry,
 812                         unsigned int flags)
 813 {
 814         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 815         struct inode *old_inode = d_inode(old_dentry);
 816         struct inode *new_inode = d_inode(new_dentry);
 817         struct inode *whiteout = NULL;
 818         struct page *old_dir_page;
 819         struct page *old_page, *new_page = NULL;
 820         struct f2fs_dir_entry *old_dir_entry = NULL;
 821         struct f2fs_dir_entry *old_entry;
 822         struct f2fs_dir_entry *new_entry;
 823         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 824         int err = -ENOENT;
 825
 826         if (unlikely(f2fs_cp_error(sbi)))
 827                 return -EIO;
 828
 829         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 830                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 831                         F2FS_I(old_dentry->d_inode)->i_projid)))
 832                 return -EXDEV;
 833
 834         err = dquot_initialize(old_dir);
 835         if (err)
 836                 goto out;
 837
 838         err = dquot_initialize(new_dir);
 839         if (err)
 840                 goto out;
 841
 842         if (new_inode) {
 843                 err = dquot_initialize(new_inode);
 844                 if (err)
 845                         goto out;
 846         }
 847
 848         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 849         if (!old_entry) {
 850                 if (IS_ERR(old_page))
 851                         err = PTR_ERR(old_page);
 852                 goto out;
 853         }
 854
 855         if (S_ISDIR(old_inode->i_mode)) {
 856                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 857                 if (!old_dir_entry) {
 858                         if (IS_ERR(old_dir_page))
 859                                 err = PTR_ERR(old_dir_page);
 860                         goto out_old;
 861                 }
 862         }
 863
 864         if (flags & RENAME_WHITEOUT) {
 865                 err = f2fs_create_whiteout(old_dir, &whiteout);
 866                 if (err)
 867                         goto out_dir;
 868         }
 869
 870         if (new_inode) {
 871
 872                 err = -ENOTEMPTY;
 873                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 874                         goto out_whiteout;
 875
 876                 err = -ENOENT;
 877                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 878                                                 &new_page);
 879                 if (!new_entry) {
 880                         if (IS_ERR(new_page))
 881                                 err = PTR_ERR(new_page);
 882                         goto out_whiteout;
 883                 }
 884
 885                 f2fs_balance_fs(sbi, true);
 886
 887                 f2fs_lock_op(sbi);
 888
 889                 err = acquire_orphan_inode(sbi);
 890                 if (err)
 891                         goto put_out_dir;
 892
 893                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 894
 895                 new_inode->i_ctime = current_time(new_inode);
 896                 down_write(&F2FS_I(new_inode)->i_sem);
 897                 if (old_dir_entry)
 898                         f2fs_i_links_write(new_inode, false);
 899                 f2fs_i_links_write(new_inode, false);
 900                 up_write(&F2FS_I(new_inode)->i_sem);
 901
 902                 if (!new_inode->i_nlink)
 903                         add_orphan_inode(new_inode);
 904                 else
 905                         release_orphan_inode(sbi);
 906         } else {
 907                 f2fs_balance_fs(sbi, true);
 908
 909                 f2fs_lock_op(sbi);
 910
 911                 err = f2fs_add_link(new_dentry, old_inode);
 912                 if (err) {
 913                         f2fs_unlock_op(sbi);
 914                         goto out_whiteout;
 915                 }
 916
 917                 if (old_dir_entry)
 918                         f2fs_i_links_write(new_dir, true);
 919
 920                 /*
 921                  * old entry and new entry can locate in the same inline
 922                  * dentry in inode, when attaching new entry in inline dentry,
 923                  * it could force inline dentry conversion, after that,
 924                  * old_entry and old_page will point to wrong address, in
 925                  * order to avoid this, let's do the check and update here.
 926                  */
 927                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 928                         f2fs_put_page(old_page, 0);
 929                         old_page = NULL;
 930
 931                         old_entry = f2fs_find_entry(old_dir,
 932                                                 &old_dentry->d_name, &old_page);
 933                         if (!old_entry) {
 934                                 err = -ENOENT;
 935                                 if (IS_ERR(old_page))
 936                                         err = PTR_ERR(old_page);
 937                                 f2fs_unlock_op(sbi);
 938                                 goto out_whiteout;
 939                         }
 940                 }
 941         }
 942
 943         down_write(&F2FS_I(old_inode)->i_sem);
 944         if (!old_dir_entry || whiteout)
 945                 file_lost_pino(old_inode);
 946         else
 947                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 948         up_write(&F2FS_I(old_inode)->i_sem);
 949
 950         old_inode->i_ctime = current_time(old_inode);
 951         f2fs_mark_inode_dirty_sync(old_inode, false);
 952
 953         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 954
 955         if (whiteout) {
 956                 whiteout->i_state |= I_LINKABLE;
 957                 set_inode_flag(whiteout, FI_INC_LINK);
 958                 err = f2fs_add_link(old_dentry, whiteout);
 959                 if (err)
 960                         goto put_out_dir;
 961                 whiteout->i_state &= ~I_LINKABLE;
 962                 iput(whiteout);
 963         }
 964
 965         if (old_dir_entry) {
 966                 if (old_dir != new_dir && !whiteout)
 967                         f2fs_set_link(old_inode, old_dir_entry,
 968                                                 old_dir_page, new_dir);
 969                 else
 970                         f2fs_put_page(old_dir_page, 0);
 971                 f2fs_i_links_write(old_dir, false);
 972         }
 973         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
 974                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 975
 976         f2fs_unlock_op(sbi);
 977
 978         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 979                 f2fs_sync_fs(sbi->sb, 1);
 980         return 0;
 981
 982 put_out_dir:
 983         f2fs_unlock_op(sbi);
 984         if (new_page)
 985                 f2fs_put_page(new_page, 0);
 986 out_whiteout:
 987         if (whiteout)
 988                 iput(whiteout);
 989 out_dir:
 990         if (old_dir_entry)
 991                 f2fs_put_page(old_dir_page, 0);
 992 out_old:
 993         f2fs_put_page(old_page, 0);
 994 out:
 995         return err;
 996 }
 997
 998 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 999                              struct inode *new_dir, struct dentry *new_dentry)
1000 {
1001         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1002         struct inode *old_inode = d_inode(old_dentry);
1003         struct inode *new_inode = d_inode(new_dentry);
1004         struct page *old_dir_page, *new_dir_page;
1005         struct page *old_page, *new_page;
1006         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1007         struct f2fs_dir_entry *old_entry, *new_entry;
1008         int old_nlink = 0, new_nlink = 0;
1009         int err = -ENOENT;
1010
1011         if (unlikely(f2fs_cp_error(sbi)))
1012                 return -EIO;
1013
1014         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1015                         !projid_eq(F2FS_I(new_dir)->i_projid,
1016                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1017             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1018                         !projid_eq(F2FS_I(old_dir)->i_projid,
1019                         F2FS_I(new_dentry->d_inode)->i_projid)))
1020                 return -EXDEV;
1021
1022         err = dquot_initialize(old_dir);
1023         if (err)
1024                 goto out;
1025
1026         err = dquot_initialize(new_dir);
1027         if (err)
1028                 goto out;
1029
1030         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1031         if (!old_entry) {
1032                 if (IS_ERR(old_page))
1033                         err = PTR_ERR(old_page);
1034                 goto out;
1035         }
1036
1037         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1038         if (!new_entry) {
1039                 if (IS_ERR(new_page))
1040                         err = PTR_ERR(new_page);
1041                 goto out_old;
1042         }
1043
1044         /* prepare for updating ".." directory entry info later */
1045         if (old_dir != new_dir) {
1046                 if (S_ISDIR(old_inode->i_mode)) {
1047                         old_dir_entry = f2fs_parent_dir(old_inode,
1048                                                         &old_dir_page);
1049                         if (!old_dir_entry) {
1050                                 if (IS_ERR(old_dir_page))
1051                                         err = PTR_ERR(old_dir_page);
1052                                 goto out_new;
1053                         }
1054                 }
1055
1056                 if (S_ISDIR(new_inode->i_mode)) {
1057                         new_dir_entry = f2fs_parent_dir(new_inode,
1058                                                         &new_dir_page);
1059                         if (!new_dir_entry) {
1060                                 if (IS_ERR(new_dir_page))
1061                                         err = PTR_ERR(new_dir_page);
1062                                 goto out_old_dir;
1063                         }
1064                 }
1065         }
1066
1067         /*
1068          * If cross rename between file and directory those are not
1069          * in the same directory, we will inc nlink of file's parent
1070          * later, so we should check upper boundary of its nlink.
1071          */
1072         if ((!old_dir_entry || !new_dir_entry) &&
1073                                 old_dir_entry != new_dir_entry) {
1074                 old_nlink = old_dir_entry ? -1 : 1;
1075                 new_nlink = -old_nlink;
1076                 err = -EMLINK;
1077                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1078                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1079                         goto out_new_dir;
1080         }
1081
1082         f2fs_balance_fs(sbi, true);
1083
1084         f2fs_lock_op(sbi);
1085
1086         /* update ".." directory entry info of old dentry */
1087         if (old_dir_entry)
1088                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1089
1090         /* update ".." directory entry info of new dentry */
1091         if (new_dir_entry)
1092                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1093
1094         /* update directory entry info of old dir inode */
1095         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1096
1097         down_write(&F2FS_I(old_inode)->i_sem);
1098         file_lost_pino(old_inode);
1099         up_write(&F2FS_I(old_inode)->i_sem);
1100
1101         old_dir->i_ctime = current_time(old_dir);
1102         if (old_nlink) {
1103                 down_write(&F2FS_I(old_dir)->i_sem);
1104                 f2fs_i_links_write(old_dir, old_nlink > 0);
1105                 up_write(&F2FS_I(old_dir)->i_sem);
1106         }
1107         f2fs_mark_inode_dirty_sync(old_dir, false);
1108
1109         /* update directory entry info of new dir inode */
1110         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1111
1112         down_write(&F2FS_I(new_inode)->i_sem);
1113         file_lost_pino(new_inode);
1114         up_write(&F2FS_I(new_inode)->i_sem);
1115
1116         new_dir->i_ctime = current_time(new_dir);
1117         if (new_nlink) {
1118                 down_write(&F2FS_I(new_dir)->i_sem);
1119                 f2fs_i_links_write(new_dir, new_nlink > 0);
1120                 up_write(&F2FS_I(new_dir)->i_sem);
1121         }
1122         f2fs_mark_inode_dirty_sync(new_dir, false);
1123
1124         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1125                 add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1126                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1127         }
1128
1129         f2fs_unlock_op(sbi);
1130
1131         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1132                 f2fs_sync_fs(sbi->sb, 1);
1133         return 0;
1134 out_new_dir:
1135         if (new_dir_entry) {
1136                 f2fs_put_page(new_dir_page, 0);
1137         }
1138 out_old_dir:
1139         if (old_dir_entry) {
1140                 f2fs_put_page(old_dir_page, 0);
1141         }
1142 out_new:
1143         f2fs_put_page(new_page, 0);
1144 out_old:
1145         f2fs_put_page(old_page, 0);
1146 out:
1147         return err;
1148 }
1149
1150 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1151                         struct inode *new_dir, struct dentry *new_dentry,
1152                         unsigned int flags)
1153 {
1154         int err;
1155
1156         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1157                 return -EINVAL;
1158
1159         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1160                                      flags);
1161         if (err)
1162                 return err;
1163
1164         if (flags & RENAME_EXCHANGE) {
1165                 return f2fs_cross_rename(old_dir, old_dentry,
1166                                          new_dir, new_dentry);
1167         }
1168         /*
1169          * VFS has already handled the new dentry existence case,
1170          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1171          */
1172         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1173 }
1174
1175 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1176 {
1177         struct inode *inode = d_inode(dentry);
1178         struct page *page;
1179         void *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);
1190         put_page(page);
1191         return *cookie = target;
1192 }
1193
1194 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1195         .readlink       = generic_readlink,
1196         .follow_link    = f2fs_encrypted_follow_link,
1197         .put_link       = kfree_put_link,
1198         .getattr        = f2fs_getattr,
1199         .setattr        = f2fs_setattr,
1200 #ifdef CONFIG_F2FS_FS_XATTR
1201         .setxattr       = generic_setxattr,
1202         .getxattr       = generic_getxattr,
1203         .listxattr      = f2fs_listxattr,
1204         .removexattr    = generic_removexattr,
1205 #endif
1206 };
1207
1208 const struct inode_operations f2fs_dir_inode_operations = {
1209         .create         = f2fs_create,
1210         .lookup         = f2fs_lookup,
1211         .link           = f2fs_link,
1212         .unlink         = f2fs_unlink,
1213         .symlink        = f2fs_symlink,
1214         .mkdir          = f2fs_mkdir,
1215         .rmdir          = f2fs_rmdir,
1216         .mknod          = f2fs_mknod,
1217         .rename2        = f2fs_rename2,
1218         .tmpfile        = f2fs_tmpfile,
1219         .getattr        = f2fs_getattr,
1220         .setattr        = f2fs_setattr,
1221         .get_acl        = f2fs_get_acl,
1222         .set_acl        = f2fs_set_acl,
1223 #ifdef CONFIG_F2FS_FS_XATTR
1224         .setxattr       = generic_setxattr,
1225         .getxattr       = generic_getxattr,
1226         .listxattr      = f2fs_listxattr,
1227         .removexattr    = generic_removexattr,
1228 #endif
1229 };
1230
1231 const struct inode_operations f2fs_symlink_inode_operations = {
1232         .readlink       = generic_readlink,
1233         .follow_link    = f2fs_follow_link,
1234         .put_link       = page_put_link,
1235         .getattr        = f2fs_getattr,
1236         .setattr        = f2fs_setattr,
1237 #ifdef CONFIG_F2FS_FS_XATTR
1238         .setxattr       = generic_setxattr,
1239         .getxattr       = generic_getxattr,
1240         .listxattr      = f2fs_listxattr,
1241         .removexattr    = generic_removexattr,
1242 #endif
1243 };
1244
1245 const struct inode_operations f2fs_special_inode_operations = {
1246         .getattr        = f2fs_getattr,
1247         .setattr        = f2fs_setattr,
1248         .get_acl        = f2fs_get_acl,
1249         .set_acl        = f2fs_set_acl,
1250 #ifdef CONFIG_F2FS_FS_XATTR
1251         .setxattr       = generic_setxattr,
1252         .getxattr       = generic_getxattr,
1253         .listxattr      = f2fs_listxattr,
1254         .removexattr    = generic_removexattr,
1255 #endif
1256 };