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
  19 #include "f2fs.h"
  20 #include "node.h"
  21 #include "xattr.h"
  22 #include "acl.h"
  23 #include <trace/events/f2fs.h>
  24
  25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  26 {
  27         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  28         nid_t ino;
  29         struct inode *inode;
  30         bool nid_free = false;
  31         int err;
  32
  33         inode = new_inode(dir->i_sb);
  34         if (!inode)
  35                 return ERR_PTR(-ENOMEM);
  36
  37         f2fs_lock_op(sbi);
  38         if (!alloc_nid(sbi, &ino)) {
  39                 f2fs_unlock_op(sbi);
  40                 err = -ENOSPC;
  41                 goto fail;
  42         }
  43         f2fs_unlock_op(sbi);
  44
  45         inode_init_owner(inode, dir, mode);
  46
  47         inode->i_ino = ino;
  48         inode->i_blocks = 0;
  49         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
  50         inode->i_generation = sbi->s_next_generation++;
  51
  52         err = insert_inode_locked(inode);
  53         if (err) {
  54                 err = -EINVAL;
  55                 nid_free = true;
  56                 goto fail;
  57         }
  58
  59         /* If the directory encrypted, then we should encrypt the inode. */
  60         if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
  61                 f2fs_set_encrypted_inode(inode);
  62
  63         set_inode_flag(inode, FI_NEW_INODE);
  64
  65         if (test_opt(sbi, INLINE_XATTR))
  66                 set_inode_flag(inode, FI_INLINE_XATTR);
  67         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  68                 set_inode_flag(inode, FI_INLINE_DATA);
  69         if (f2fs_may_inline_dentry(inode))
  70                 set_inode_flag(inode, FI_INLINE_DENTRY);
  71
  72         f2fs_init_extent_tree(inode, NULL);
  73
  74         stat_inc_inline_xattr(inode);
  75         stat_inc_inline_inode(inode);
  76         stat_inc_inline_dir(inode);
  77
  78         trace_f2fs_new_inode(inode, 0);
  79         return inode;
  80
  81 fail:
  82         trace_f2fs_new_inode(inode, err);
  83         make_bad_inode(inode);
  84         if (nid_free)
  85                 set_inode_flag(inode, FI_FREE_NID);
  86         iput(inode);
  87         return ERR_PTR(err);
  88 }
  89
  90 static int is_multimedia_file(const unsigned char *s, const char *sub)
  91 {
  92         size_t slen = strlen(s);
  93         size_t sublen = strlen(sub);
  94         int i;
  95
  96         /*
  97          * filename format of multimedia file should be defined as:
  98          * "filename + '.' + extension + (optional: '.' + temp extension)".
  99          */
 100         if (slen < sublen + 2)
 101                 return 0;
 102
 103         for (i = 1; i < slen - sublen; i++) {
 104                 if (s[i] != '.')
 105                         continue;
 106                 if (!strncasecmp(s + i + 1, sub, sublen))
 107                         return 1;
 108         }
 109
 110         return 0;
 111 }
 112
 113 /*
 114  * Set multimedia files as cold files for hot/cold data separation
 115  */
 116 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
 117                 const unsigned char *name)
 118 {
 119         int i;
 120         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 121
 122         int count = le32_to_cpu(sbi->raw_super->extension_count);
 123         for (i = 0; i < count; i++) {
 124                 if (is_multimedia_file(name, extlist[i])) {
 125                         file_set_cold(inode);
 126                         break;
 127                 }
 128         }
 129 }
 130
 131 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 132                                                 bool excl)
 133 {
 134         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 135         struct inode *inode;
 136         nid_t ino = 0;
 137         int err;
 138
 139         inode = f2fs_new_inode(dir, mode);
 140         if (IS_ERR(inode))
 141                 return PTR_ERR(inode);
 142
 143         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 144                 set_cold_files(sbi, inode, dentry->d_name.name);
 145
 146         inode->i_op = &f2fs_file_inode_operations;
 147         inode->i_fop = &f2fs_file_operations;
 148         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 149         ino = inode->i_ino;
 150
 151         f2fs_lock_op(sbi);
 152         err = f2fs_add_link(dentry, inode);
 153         if (err)
 154                 goto out;
 155         f2fs_unlock_op(sbi);
 156
 157         alloc_nid_done(sbi, ino);
 158
 159         d_instantiate(dentry, inode);
 160         unlock_new_inode(inode);
 161
 162         if (IS_DIRSYNC(dir))
 163                 f2fs_sync_fs(sbi->sb, 1);
 164
 165         f2fs_balance_fs(sbi, true);
 166         return 0;
 167 out:
 168         handle_failed_inode(inode);
 169         return err;
 170 }
 171
 172 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 173                 struct dentry *dentry)
 174 {
 175         struct inode *inode = d_inode(old_dentry);
 176         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 177         int err;
 178
 179         if (f2fs_encrypted_inode(dir) &&
 180                         !fscrypt_has_permitted_context(dir, inode))
 181                 return -EPERM;
 182
 183         f2fs_balance_fs(sbi, true);
 184
 185         inode->i_ctime = current_time(inode);
 186         ihold(inode);
 187
 188         set_inode_flag(inode, FI_INC_LINK);
 189         f2fs_lock_op(sbi);
 190         err = f2fs_add_link(dentry, inode);
 191         if (err)
 192                 goto out;
 193         f2fs_unlock_op(sbi);
 194
 195         d_instantiate(dentry, inode);
 196
 197         if (IS_DIRSYNC(dir))
 198                 f2fs_sync_fs(sbi->sb, 1);
 199         return 0;
 200 out:
 201         clear_inode_flag(inode, FI_INC_LINK);
 202         iput(inode);
 203         f2fs_unlock_op(sbi);
 204         return err;
 205 }
 206
 207 struct dentry *f2fs_get_parent(struct dentry *child)
 208 {
 209         struct qstr dotdot = QSTR_INIT("..", 2);
 210         struct page *page;
 211         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 212         if (!ino) {
 213                 if (IS_ERR(page))
 214                         return ERR_CAST(page);
 215                 return ERR_PTR(-ENOENT);
 216         }
 217         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 218 }
 219
 220 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 221 {
 222         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 223         struct qstr dot = QSTR_INIT(".", 1);
 224         struct qstr dotdot = QSTR_INIT("..", 2);
 225         struct f2fs_dir_entry *de;
 226         struct page *page;
 227         int err = 0;
 228
 229         if (f2fs_readonly(sbi->sb)) {
 230                 f2fs_msg(sbi->sb, KERN_INFO,
 231                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 232                         "in readonly mountpoint", dir->i_ino, pino);
 233                 return 0;
 234         }
 235
 236         f2fs_balance_fs(sbi, true);
 237
 238         f2fs_lock_op(sbi);
 239
 240         de = f2fs_find_entry(dir, &dot, &page);
 241         if (de) {
 242                 f2fs_dentry_kunmap(dir, page);
 243                 f2fs_put_page(page, 0);
 244         } else if (IS_ERR(page)) {
 245                 err = PTR_ERR(page);
 246                 goto out;
 247         } else {
 248                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 249                 if (err)
 250                         goto out;
 251         }
 252
 253         de = f2fs_find_entry(dir, &dotdot, &page);
 254         if (de) {
 255                 f2fs_dentry_kunmap(dir, page);
 256                 f2fs_put_page(page, 0);
 257         } else if (IS_ERR(page)) {
 258                 err = PTR_ERR(page);
 259         } else {
 260                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 261         }
 262 out:
 263         if (!err)
 264                 clear_inode_flag(dir, FI_INLINE_DOTS);
 265
 266         f2fs_unlock_op(sbi);
 267         return err;
 268 }
 269
 270 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 271                 unsigned int flags)
 272 {
 273         struct inode *inode = NULL;
 274         struct f2fs_dir_entry *de;
 275         struct page *page;
 276         nid_t ino;
 277         int err = 0;
 278         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 279
 280         if (f2fs_encrypted_inode(dir)) {
 281                 int res = fscrypt_get_encryption_info(dir);
 282
 283                 /*
 284                  * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
 285                  * created while the directory was encrypted and we
 286                  * don't have access to the key.
 287                  */
 288                 if (fscrypt_has_encryption_key(dir))
 289                         fscrypt_set_encrypted_dentry(dentry);
 290                 fscrypt_set_d_op(dentry);
 291                 if (res && res != -ENOKEY)
 292                         return ERR_PTR(res);
 293         }
 294
 295         if (dentry->d_name.len > F2FS_NAME_LEN)
 296                 return ERR_PTR(-ENAMETOOLONG);
 297
 298         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 299         if (!de) {
 300                 if (IS_ERR(page))
 301                         return (struct dentry *)page;
 302                 return d_splice_alias(inode, dentry);
 303         }
 304
 305         ino = le32_to_cpu(de->ino);
 306         f2fs_dentry_kunmap(dir, page);
 307         f2fs_put_page(page, 0);
 308
 309         inode = f2fs_iget(dir->i_sb, ino);
 310         if (IS_ERR(inode))
 311                 return ERR_CAST(inode);
 312
 313         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 314                 err = __recover_dot_dentries(dir, root_ino);
 315                 if (err)
 316                         goto err_out;
 317         }
 318
 319         if (f2fs_has_inline_dots(inode)) {
 320                 err = __recover_dot_dentries(inode, dir->i_ino);
 321                 if (err)
 322                         goto err_out;
 323         }
 324         if (f2fs_encrypted_inode(dir) &&
 325             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 326             !fscrypt_has_permitted_context(dir, inode)) {
 327                 f2fs_msg(inode->i_sb, KERN_WARNING,
 328                          "Inconsistent encryption contexts: %lu/%lu",
 329                          dir->i_ino, inode->i_ino);
 330                 err = -EPERM;
 331                 goto err_out;
 332         }
 333         return d_splice_alias(inode, dentry);
 334
 335 err_out:
 336         iput(inode);
 337         return ERR_PTR(err);
 338 }
 339
 340 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 341 {
 342         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 343         struct inode *inode = d_inode(dentry);
 344         struct f2fs_dir_entry *de;
 345         struct page *page;
 346         int err = -ENOENT;
 347
 348         trace_f2fs_unlink_enter(dir, dentry);
 349
 350         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 351         if (!de) {
 352                 if (IS_ERR(page))
 353                         err = PTR_ERR(page);
 354                 goto fail;
 355         }
 356
 357         f2fs_balance_fs(sbi, true);
 358
 359         f2fs_lock_op(sbi);
 360         err = acquire_orphan_inode(sbi);
 361         if (err) {
 362                 f2fs_unlock_op(sbi);
 363                 f2fs_dentry_kunmap(dir, page);
 364                 f2fs_put_page(page, 0);
 365                 goto fail;
 366         }
 367         f2fs_delete_entry(de, page, dir, inode);
 368         f2fs_unlock_op(sbi);
 369
 370         if (IS_DIRSYNC(dir))
 371                 f2fs_sync_fs(sbi->sb, 1);
 372 fail:
 373         trace_f2fs_unlink_exit(inode, err);
 374         return err;
 375 }
 376
 377 static const char *f2fs_get_link(struct dentry *dentry,
 378                                  struct inode *inode,
 379                                  struct delayed_call *done)
 380 {
 381         const char *link = page_get_link(dentry, inode, done);
 382         if (!IS_ERR(link) && !*link) {
 383                 /* this is broken symlink case */
 384                 do_delayed_call(done);
 385                 clear_delayed_call(done);
 386                 link = ERR_PTR(-ENOENT);
 387         }
 388         return link;
 389 }
 390
 391 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 392                                         const char *symname)
 393 {
 394         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 395         struct inode *inode;
 396         size_t len = strlen(symname);
 397         struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
 398         struct fscrypt_symlink_data *sd = NULL;
 399         int err;
 400
 401         if (f2fs_encrypted_inode(dir)) {
 402                 err = fscrypt_get_encryption_info(dir);
 403                 if (err)
 404                         return err;
 405
 406                 if (!fscrypt_has_encryption_key(dir))
 407                         return -ENOKEY;
 408
 409                 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
 410                                 sizeof(struct fscrypt_symlink_data));
 411         }
 412
 413         if (disk_link.len > dir->i_sb->s_blocksize)
 414                 return -ENAMETOOLONG;
 415
 416         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 417         if (IS_ERR(inode))
 418                 return PTR_ERR(inode);
 419
 420         if (f2fs_encrypted_inode(inode))
 421                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 422         else
 423                 inode->i_op = &f2fs_symlink_inode_operations;
 424         inode_nohighmem(inode);
 425         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 426
 427         f2fs_lock_op(sbi);
 428         err = f2fs_add_link(dentry, inode);
 429         if (err)
 430                 goto out;
 431         f2fs_unlock_op(sbi);
 432         alloc_nid_done(sbi, inode->i_ino);
 433
 434         if (f2fs_encrypted_inode(inode)) {
 435                 struct qstr istr = QSTR_INIT(symname, len);
 436                 struct fscrypt_str ostr;
 437
 438                 sd = kzalloc(disk_link.len, GFP_NOFS);
 439                 if (!sd) {
 440                         err = -ENOMEM;
 441                         goto err_out;
 442                 }
 443
 444                 err = fscrypt_get_encryption_info(inode);
 445                 if (err)
 446                         goto err_out;
 447
 448                 if (!fscrypt_has_encryption_key(inode)) {
 449                         err = -ENOKEY;
 450                         goto err_out;
 451                 }
 452
 453                 ostr.name = sd->encrypted_path;
 454                 ostr.len = disk_link.len;
 455                 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
 456                 if (err)
 457                         goto err_out;
 458
 459                 sd->len = cpu_to_le16(ostr.len);
 460                 disk_link.name = (char *)sd;
 461         }
 462
 463         err = page_symlink(inode, disk_link.name, disk_link.len);
 464
 465 err_out:
 466         d_instantiate(dentry, inode);
 467         unlock_new_inode(inode);
 468
 469         /*
 470          * Let's flush symlink data in order to avoid broken symlink as much as
 471          * possible. Nevertheless, fsyncing is the best way, but there is no
 472          * way to get a file descriptor in order to flush that.
 473          *
 474          * Note that, it needs to do dir->fsync to make this recoverable.
 475          * If the symlink path is stored into inline_data, there is no
 476          * performance regression.
 477          */
 478         if (!err) {
 479                 filemap_write_and_wait_range(inode->i_mapping, 0,
 480                                                         disk_link.len - 1);
 481
 482                 if (IS_DIRSYNC(dir))
 483                         f2fs_sync_fs(sbi->sb, 1);
 484         } else {
 485                 f2fs_unlink(dir, dentry);
 486         }
 487
 488         kfree(sd);
 489
 490         f2fs_balance_fs(sbi, true);
 491         return err;
 492 out:
 493         handle_failed_inode(inode);
 494         return err;
 495 }
 496
 497 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 498 {
 499         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 500         struct inode *inode;
 501         int err;
 502
 503         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 504         if (IS_ERR(inode))
 505                 return PTR_ERR(inode);
 506
 507         inode->i_op = &f2fs_dir_inode_operations;
 508         inode->i_fop = &f2fs_dir_operations;
 509         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 510         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 511
 512         set_inode_flag(inode, FI_INC_LINK);
 513         f2fs_lock_op(sbi);
 514         err = f2fs_add_link(dentry, inode);
 515         if (err)
 516                 goto out_fail;
 517         f2fs_unlock_op(sbi);
 518
 519         alloc_nid_done(sbi, inode->i_ino);
 520
 521         d_instantiate(dentry, inode);
 522         unlock_new_inode(inode);
 523
 524         if (IS_DIRSYNC(dir))
 525                 f2fs_sync_fs(sbi->sb, 1);
 526
 527         f2fs_balance_fs(sbi, true);
 528         return 0;
 529
 530 out_fail:
 531         clear_inode_flag(inode, FI_INC_LINK);
 532         handle_failed_inode(inode);
 533         return err;
 534 }
 535
 536 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 537 {
 538         struct inode *inode = d_inode(dentry);
 539         if (f2fs_empty_dir(inode))
 540                 return f2fs_unlink(dir, dentry);
 541         return -ENOTEMPTY;
 542 }
 543
 544 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 545                                 umode_t mode, dev_t rdev)
 546 {
 547         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 548         struct inode *inode;
 549         int err = 0;
 550
 551         inode = f2fs_new_inode(dir, mode);
 552         if (IS_ERR(inode))
 553                 return PTR_ERR(inode);
 554
 555         init_special_inode(inode, inode->i_mode, rdev);
 556         inode->i_op = &f2fs_special_inode_operations;
 557
 558         f2fs_lock_op(sbi);
 559         err = f2fs_add_link(dentry, inode);
 560         if (err)
 561                 goto out;
 562         f2fs_unlock_op(sbi);
 563
 564         alloc_nid_done(sbi, inode->i_ino);
 565
 566         d_instantiate(dentry, inode);
 567         unlock_new_inode(inode);
 568
 569         if (IS_DIRSYNC(dir))
 570                 f2fs_sync_fs(sbi->sb, 1);
 571
 572         f2fs_balance_fs(sbi, true);
 573         return 0;
 574 out:
 575         handle_failed_inode(inode);
 576         return err;
 577 }
 578
 579 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 580                                         umode_t mode, struct inode **whiteout)
 581 {
 582         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 583         struct inode *inode;
 584         int err;
 585
 586         inode = f2fs_new_inode(dir, mode);
 587         if (IS_ERR(inode))
 588                 return PTR_ERR(inode);
 589
 590         if (whiteout) {
 591                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 592                 inode->i_op = &f2fs_special_inode_operations;
 593         } else {
 594                 inode->i_op = &f2fs_file_inode_operations;
 595                 inode->i_fop = &f2fs_file_operations;
 596                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 597         }
 598
 599         f2fs_lock_op(sbi);
 600         err = acquire_orphan_inode(sbi);
 601         if (err)
 602                 goto out;
 603
 604         err = f2fs_do_tmpfile(inode, dir);
 605         if (err)
 606                 goto release_out;
 607
 608         /*
 609          * add this non-linked tmpfile to orphan list, in this way we could
 610          * remove all unused data of tmpfile after abnormal power-off.
 611          */
 612         add_orphan_inode(inode);
 613         alloc_nid_done(sbi, inode->i_ino);
 614
 615         if (whiteout) {
 616                 f2fs_i_links_write(inode, false);
 617                 *whiteout = inode;
 618         } else {
 619                 d_tmpfile(dentry, inode);
 620         }
 621         /* link_count was changed by d_tmpfile as well. */
 622         f2fs_unlock_op(sbi);
 623         unlock_new_inode(inode);
 624
 625         f2fs_balance_fs(sbi, true);
 626         return 0;
 627
 628 release_out:
 629         release_orphan_inode(sbi);
 630 out:
 631         handle_failed_inode(inode);
 632         return err;
 633 }
 634
 635 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 636 {
 637         if (f2fs_encrypted_inode(dir)) {
 638                 int err = fscrypt_get_encryption_info(dir);
 639                 if (err)
 640                         return err;
 641         }
 642
 643         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 644 }
 645
 646 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 647 {
 648         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 649 }
 650
 651 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 652                         struct inode *new_dir, struct dentry *new_dentry,
 653                         unsigned int flags)
 654 {
 655         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 656         struct inode *old_inode = d_inode(old_dentry);
 657         struct inode *new_inode = d_inode(new_dentry);
 658         struct inode *whiteout = NULL;
 659         struct page *old_dir_page;
 660         struct page *old_page, *new_page = NULL;
 661         struct f2fs_dir_entry *old_dir_entry = NULL;
 662         struct f2fs_dir_entry *old_entry;
 663         struct f2fs_dir_entry *new_entry;
 664         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 665         int err = -ENOENT;
 666
 667         if ((f2fs_encrypted_inode(old_dir) &&
 668                         !fscrypt_has_encryption_key(old_dir)) ||
 669                         (f2fs_encrypted_inode(new_dir) &&
 670                         !fscrypt_has_encryption_key(new_dir)))
 671                 return -ENOKEY;
 672
 673         if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
 674                         !fscrypt_has_permitted_context(new_dir, old_inode)) {
 675                 err = -EPERM;
 676                 goto out;
 677         }
 678
 679         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 680         if (!old_entry) {
 681                 if (IS_ERR(old_page))
 682                         err = PTR_ERR(old_page);
 683                 goto out;
 684         }
 685
 686         if (S_ISDIR(old_inode->i_mode)) {
 687                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 688                 if (!old_dir_entry) {
 689                         if (IS_ERR(old_dir_page))
 690                                 err = PTR_ERR(old_dir_page);
 691                         goto out_old;
 692                 }
 693         }
 694
 695         if (flags & RENAME_WHITEOUT) {
 696                 err = f2fs_create_whiteout(old_dir, &whiteout);
 697                 if (err)
 698                         goto out_dir;
 699         }
 700
 701         if (new_inode) {
 702
 703                 err = -ENOTEMPTY;
 704                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 705                         goto out_whiteout;
 706
 707                 err = -ENOENT;
 708                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 709                                                 &new_page);
 710                 if (!new_entry) {
 711                         if (IS_ERR(new_page))
 712                                 err = PTR_ERR(new_page);
 713                         goto out_whiteout;
 714                 }
 715
 716                 f2fs_balance_fs(sbi, true);
 717
 718                 f2fs_lock_op(sbi);
 719
 720                 err = acquire_orphan_inode(sbi);
 721                 if (err)
 722                         goto put_out_dir;
 723
 724                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 725
 726                 new_inode->i_ctime = current_time(new_inode);
 727                 down_write(&F2FS_I(new_inode)->i_sem);
 728                 if (old_dir_entry)
 729                         f2fs_i_links_write(new_inode, false);
 730                 f2fs_i_links_write(new_inode, false);
 731                 up_write(&F2FS_I(new_inode)->i_sem);
 732
 733                 if (!new_inode->i_nlink)
 734                         add_orphan_inode(new_inode);
 735                 else
 736                         release_orphan_inode(sbi);
 737         } else {
 738                 f2fs_balance_fs(sbi, true);
 739
 740                 f2fs_lock_op(sbi);
 741
 742                 err = f2fs_add_link(new_dentry, old_inode);
 743                 if (err) {
 744                         f2fs_unlock_op(sbi);
 745                         goto out_whiteout;
 746                 }
 747
 748                 if (old_dir_entry)
 749                         f2fs_i_links_write(new_dir, true);
 750
 751                 /*
 752                  * old entry and new entry can locate in the same inline
 753                  * dentry in inode, when attaching new entry in inline dentry,
 754                  * it could force inline dentry conversion, after that,
 755                  * old_entry and old_page will point to wrong address, in
 756                  * order to avoid this, let's do the check and update here.
 757                  */
 758                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 759                         f2fs_put_page(old_page, 0);
 760                         old_page = NULL;
 761
 762                         old_entry = f2fs_find_entry(old_dir,
 763                                                 &old_dentry->d_name, &old_page);
 764                         if (!old_entry) {
 765                                 err = -ENOENT;
 766                                 if (IS_ERR(old_page))
 767                                         err = PTR_ERR(old_page);
 768                                 f2fs_unlock_op(sbi);
 769                                 goto out_whiteout;
 770                         }
 771                 }
 772         }
 773
 774         down_write(&F2FS_I(old_inode)->i_sem);
 775         file_lost_pino(old_inode);
 776         up_write(&F2FS_I(old_inode)->i_sem);
 777
 778         old_inode->i_ctime = current_time(old_inode);
 779         f2fs_mark_inode_dirty_sync(old_inode, false);
 780
 781         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 782
 783         if (whiteout) {
 784                 whiteout->i_state |= I_LINKABLE;
 785                 set_inode_flag(whiteout, FI_INC_LINK);
 786                 err = f2fs_add_link(old_dentry, whiteout);
 787                 if (err)
 788                         goto put_out_dir;
 789                 whiteout->i_state &= ~I_LINKABLE;
 790                 iput(whiteout);
 791         }
 792
 793         if (old_dir_entry) {
 794                 if (old_dir != new_dir && !whiteout) {
 795                         f2fs_set_link(old_inode, old_dir_entry,
 796                                                 old_dir_page, new_dir);
 797                 } else {
 798                         f2fs_dentry_kunmap(old_inode, old_dir_page);
 799                         f2fs_put_page(old_dir_page, 0);
 800                 }
 801                 f2fs_i_links_write(old_dir, false);
 802         }
 803
 804         f2fs_unlock_op(sbi);
 805
 806         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 807                 f2fs_sync_fs(sbi->sb, 1);
 808         return 0;
 809
 810 put_out_dir:
 811         f2fs_unlock_op(sbi);
 812         if (new_page) {
 813                 f2fs_dentry_kunmap(new_dir, new_page);
 814                 f2fs_put_page(new_page, 0);
 815         }
 816 out_whiteout:
 817         if (whiteout)
 818                 iput(whiteout);
 819 out_dir:
 820         if (old_dir_entry) {
 821                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 822                 f2fs_put_page(old_dir_page, 0);
 823         }
 824 out_old:
 825         f2fs_dentry_kunmap(old_dir, old_page);
 826         f2fs_put_page(old_page, 0);
 827 out:
 828         return err;
 829 }
 830
 831 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 832                              struct inode *new_dir, struct dentry *new_dentry)
 833 {
 834         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 835         struct inode *old_inode = d_inode(old_dentry);
 836         struct inode *new_inode = d_inode(new_dentry);
 837         struct page *old_dir_page, *new_dir_page;
 838         struct page *old_page, *new_page;
 839         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
 840         struct f2fs_dir_entry *old_entry, *new_entry;
 841         int old_nlink = 0, new_nlink = 0;
 842         int err = -ENOENT;
 843
 844         if ((f2fs_encrypted_inode(old_dir) &&
 845                         !fscrypt_has_encryption_key(old_dir)) ||
 846                         (f2fs_encrypted_inode(new_dir) &&
 847                         !fscrypt_has_encryption_key(new_dir)))
 848                 return -ENOKEY;
 849
 850         if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
 851                         (old_dir != new_dir) &&
 852                         (!fscrypt_has_permitted_context(new_dir, old_inode) ||
 853                          !fscrypt_has_permitted_context(old_dir, new_inode)))
 854                 return -EPERM;
 855
 856         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 857         if (!old_entry) {
 858                 if (IS_ERR(old_page))
 859                         err = PTR_ERR(old_page);
 860                 goto out;
 861         }
 862
 863         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
 864         if (!new_entry) {
 865                 if (IS_ERR(new_page))
 866                         err = PTR_ERR(new_page);
 867                 goto out_old;
 868         }
 869
 870         /* prepare for updating ".." directory entry info later */
 871         if (old_dir != new_dir) {
 872                 if (S_ISDIR(old_inode->i_mode)) {
 873                         old_dir_entry = f2fs_parent_dir(old_inode,
 874                                                         &old_dir_page);
 875                         if (!old_dir_entry) {
 876                                 if (IS_ERR(old_dir_page))
 877                                         err = PTR_ERR(old_dir_page);
 878                                 goto out_new;
 879                         }
 880                 }
 881
 882                 if (S_ISDIR(new_inode->i_mode)) {
 883                         new_dir_entry = f2fs_parent_dir(new_inode,
 884                                                         &new_dir_page);
 885                         if (!new_dir_entry) {
 886                                 if (IS_ERR(new_dir_page))
 887                                         err = PTR_ERR(new_dir_page);
 888                                 goto out_old_dir;
 889                         }
 890                 }
 891         }
 892
 893         /*
 894          * If cross rename between file and directory those are not
 895          * in the same directory, we will inc nlink of file's parent
 896          * later, so we should check upper boundary of its nlink.
 897          */
 898         if ((!old_dir_entry || !new_dir_entry) &&
 899                                 old_dir_entry != new_dir_entry) {
 900                 old_nlink = old_dir_entry ? -1 : 1;
 901                 new_nlink = -old_nlink;
 902                 err = -EMLINK;
 903                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
 904                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
 905                         goto out_new_dir;
 906         }
 907
 908         f2fs_balance_fs(sbi, true);
 909
 910         f2fs_lock_op(sbi);
 911
 912         /* update ".." directory entry info of old dentry */
 913         if (old_dir_entry)
 914                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
 915
 916         /* update ".." directory entry info of new dentry */
 917         if (new_dir_entry)
 918                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
 919
 920         /* update directory entry info of old dir inode */
 921         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
 922
 923         down_write(&F2FS_I(old_inode)->i_sem);
 924         file_lost_pino(old_inode);
 925         up_write(&F2FS_I(old_inode)->i_sem);
 926
 927         old_dir->i_ctime = current_time(old_dir);
 928         if (old_nlink) {
 929                 down_write(&F2FS_I(old_dir)->i_sem);
 930                 f2fs_i_links_write(old_dir, old_nlink > 0);
 931                 up_write(&F2FS_I(old_dir)->i_sem);
 932         }
 933         f2fs_mark_inode_dirty_sync(old_dir, false);
 934
 935         /* update directory entry info of new dir inode */
 936         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 937
 938         down_write(&F2FS_I(new_inode)->i_sem);
 939         file_lost_pino(new_inode);
 940         up_write(&F2FS_I(new_inode)->i_sem);
 941
 942         new_dir->i_ctime = current_time(new_dir);
 943         if (new_nlink) {
 944                 down_write(&F2FS_I(new_dir)->i_sem);
 945                 f2fs_i_links_write(new_dir, new_nlink > 0);
 946                 up_write(&F2FS_I(new_dir)->i_sem);
 947         }
 948         f2fs_mark_inode_dirty_sync(new_dir, false);
 949
 950         f2fs_unlock_op(sbi);
 951
 952         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 953                 f2fs_sync_fs(sbi->sb, 1);
 954         return 0;
 955 out_new_dir:
 956         if (new_dir_entry) {
 957                 f2fs_dentry_kunmap(new_inode, new_dir_page);
 958                 f2fs_put_page(new_dir_page, 0);
 959         }
 960 out_old_dir:
 961         if (old_dir_entry) {
 962                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 963                 f2fs_put_page(old_dir_page, 0);
 964         }
 965 out_new:
 966         f2fs_dentry_kunmap(new_dir, new_page);
 967         f2fs_put_page(new_page, 0);
 968 out_old:
 969         f2fs_dentry_kunmap(old_dir, old_page);
 970         f2fs_put_page(old_page, 0);
 971 out:
 972         return err;
 973 }
 974
 975 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
 976                         struct inode *new_dir, struct dentry *new_dentry,
 977                         unsigned int flags)
 978 {
 979         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 980                 return -EINVAL;
 981
 982         if (flags & RENAME_EXCHANGE) {
 983                 return f2fs_cross_rename(old_dir, old_dentry,
 984                                          new_dir, new_dentry);
 985         }
 986         /*
 987          * VFS has already handled the new dentry existence case,
 988          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
 989          */
 990         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
 991 }
 992
 993 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
 994                                            struct inode *inode,
 995                                            struct delayed_call *done)
 996 {
 997         struct page *cpage = NULL;
 998         char *caddr, *paddr = NULL;
 999         struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1000         struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1001         struct fscrypt_symlink_data *sd;
1002         u32 max_size = inode->i_sb->s_blocksize;
1003         int res;
1004
1005         if (!dentry)
1006                 return ERR_PTR(-ECHILD);
1007
1008         res = fscrypt_get_encryption_info(inode);
1009         if (res)
1010                 return ERR_PTR(res);
1011
1012         cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1013         if (IS_ERR(cpage))
1014                 return ERR_CAST(cpage);
1015         caddr = page_address(cpage);
1016
1017         /* Symlink is encrypted */
1018         sd = (struct fscrypt_symlink_data *)caddr;
1019         cstr.name = sd->encrypted_path;
1020         cstr.len = le16_to_cpu(sd->len);
1021
1022         /* this is broken symlink case */
1023         if (unlikely(cstr.len == 0)) {
1024                 res = -ENOENT;
1025                 goto errout;
1026         }
1027
1028         if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1029                 /* Symlink data on the disk is corrupted */
1030                 res = -EIO;
1031                 goto errout;
1032         }
1033         res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1034         if (res)
1035                 goto errout;
1036
1037         res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1038         if (res)
1039                 goto errout;
1040
1041         /* this is broken symlink case */
1042         if (unlikely(pstr.name[0] == 0)) {
1043                 res = -ENOENT;
1044                 goto errout;
1045         }
1046
1047         paddr = pstr.name;
1048
1049         /* Null-terminate the name */
1050         paddr[pstr.len] = '\0';
1051
1052         put_page(cpage);
1053         set_delayed_call(done, kfree_link, paddr);
1054         return paddr;
1055 errout:
1056         fscrypt_fname_free_buffer(&pstr);
1057         put_page(cpage);
1058         return ERR_PTR(res);
1059 }
1060
1061 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1062         .get_link       = f2fs_encrypted_get_link,
1063         .getattr        = f2fs_getattr,
1064         .setattr        = f2fs_setattr,
1065 #ifdef CONFIG_F2FS_FS_XATTR
1066         .listxattr      = f2fs_listxattr,
1067 #endif
1068 };
1069
1070 const struct inode_operations f2fs_dir_inode_operations = {
1071         .create         = f2fs_create,
1072         .lookup         = f2fs_lookup,
1073         .link           = f2fs_link,
1074         .unlink         = f2fs_unlink,
1075         .symlink        = f2fs_symlink,
1076         .mkdir          = f2fs_mkdir,
1077         .rmdir          = f2fs_rmdir,
1078         .mknod          = f2fs_mknod,
1079         .rename         = f2fs_rename2,
1080         .tmpfile        = f2fs_tmpfile,
1081         .getattr        = f2fs_getattr,
1082         .setattr        = f2fs_setattr,
1083         .get_acl        = f2fs_get_acl,
1084         .set_acl        = f2fs_set_acl,
1085 #ifdef CONFIG_F2FS_FS_XATTR
1086         .listxattr      = f2fs_listxattr,
1087 #endif
1088 };
1089
1090 const struct inode_operations f2fs_symlink_inode_operations = {
1091         .get_link       = f2fs_get_link,
1092         .getattr        = f2fs_getattr,
1093         .setattr        = f2fs_setattr,
1094 #ifdef CONFIG_F2FS_FS_XATTR
1095         .listxattr      = f2fs_listxattr,
1096 #endif
1097 };
1098
1099 const struct inode_operations f2fs_special_inode_operations = {
1100         .getattr        = f2fs_getattr,
1101         .setattr        = f2fs_setattr,
1102         .get_acl        = f2fs_get_acl,
1103         .set_acl        = f2fs_set_acl,
1104 #ifdef CONFIG_F2FS_FS_XATTR
1105         .listxattr      = f2fs_listxattr,
1106 #endif
1107 };