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_balance_fs(sbi, true);
 152
 153         f2fs_lock_op(sbi);
 154         err = f2fs_add_link(dentry, inode);
 155         if (err)
 156                 goto out;
 157         f2fs_unlock_op(sbi);
 158
 159         alloc_nid_done(sbi, ino);
 160
 161         d_instantiate(dentry, inode);
 162         unlock_new_inode(inode);
 163
 164         if (IS_DIRSYNC(dir))
 165                 f2fs_sync_fs(sbi->sb, 1);
 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 (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
 325                         (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 326                         !fscrypt_has_permitted_context(dir, inode)) {
 327                 bool nokey = f2fs_encrypted_inode(inode) &&
 328                         !fscrypt_has_encryption_key(inode);
 329                 err = nokey ? -ENOKEY : -EPERM;
 330                 goto err_out;
 331         }
 332         return d_splice_alias(inode, dentry);
 333
 334 err_out:
 335         iput(inode);
 336         return ERR_PTR(err);
 337 }
 338
 339 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 340 {
 341         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 342         struct inode *inode = d_inode(dentry);
 343         struct f2fs_dir_entry *de;
 344         struct page *page;
 345         int err = -ENOENT;
 346
 347         trace_f2fs_unlink_enter(dir, dentry);
 348
 349         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 350         if (!de) {
 351                 if (IS_ERR(page))
 352                         err = PTR_ERR(page);
 353                 goto fail;
 354         }
 355
 356         f2fs_balance_fs(sbi, true);
 357
 358         f2fs_lock_op(sbi);
 359         err = acquire_orphan_inode(sbi);
 360         if (err) {
 361                 f2fs_unlock_op(sbi);
 362                 f2fs_dentry_kunmap(dir, page);
 363                 f2fs_put_page(page, 0);
 364                 goto fail;
 365         }
 366         f2fs_delete_entry(de, page, dir, inode);
 367         f2fs_unlock_op(sbi);
 368
 369         if (IS_DIRSYNC(dir))
 370                 f2fs_sync_fs(sbi->sb, 1);
 371 fail:
 372         trace_f2fs_unlink_exit(inode, err);
 373         return err;
 374 }
 375
 376 static const char *f2fs_get_link(struct dentry *dentry,
 377                                  struct inode *inode,
 378                                  struct delayed_call *done)
 379 {
 380         const char *link = page_get_link(dentry, inode, done);
 381         if (!IS_ERR(link) && !*link) {
 382                 /* this is broken symlink case */
 383                 do_delayed_call(done);
 384                 clear_delayed_call(done);
 385                 link = ERR_PTR(-ENOENT);
 386         }
 387         return link;
 388 }
 389
 390 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 391                                         const char *symname)
 392 {
 393         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 394         struct inode *inode;
 395         size_t len = strlen(symname);
 396         struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
 397         struct fscrypt_symlink_data *sd = NULL;
 398         int err;
 399
 400         if (f2fs_encrypted_inode(dir)) {
 401                 err = fscrypt_get_encryption_info(dir);
 402                 if (err)
 403                         return err;
 404
 405                 if (!fscrypt_has_encryption_key(dir))
 406                         return -EPERM;
 407
 408                 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
 409                                 sizeof(struct fscrypt_symlink_data));
 410         }
 411
 412         if (disk_link.len > dir->i_sb->s_blocksize)
 413                 return -ENAMETOOLONG;
 414
 415         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 416         if (IS_ERR(inode))
 417                 return PTR_ERR(inode);
 418
 419         if (f2fs_encrypted_inode(inode))
 420                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 421         else
 422                 inode->i_op = &f2fs_symlink_inode_operations;
 423         inode_nohighmem(inode);
 424         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 425
 426         f2fs_balance_fs(sbi, true);
 427
 428         f2fs_lock_op(sbi);
 429         err = f2fs_add_link(dentry, inode);
 430         if (err)
 431                 goto out;
 432         f2fs_unlock_op(sbi);
 433         alloc_nid_done(sbi, inode->i_ino);
 434
 435         if (f2fs_encrypted_inode(inode)) {
 436                 struct qstr istr = QSTR_INIT(symname, len);
 437                 struct fscrypt_str ostr;
 438
 439                 sd = kzalloc(disk_link.len, GFP_NOFS);
 440                 if (!sd) {
 441                         err = -ENOMEM;
 442                         goto err_out;
 443                 }
 444
 445                 err = fscrypt_get_encryption_info(inode);
 446                 if (err)
 447                         goto err_out;
 448
 449                 if (!fscrypt_has_encryption_key(inode)) {
 450                         err = -EPERM;
 451                         goto err_out;
 452                 }
 453
 454                 ostr.name = sd->encrypted_path;
 455                 ostr.len = disk_link.len;
 456                 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
 457                 if (err)
 458                         goto err_out;
 459
 460                 sd->len = cpu_to_le16(ostr.len);
 461                 disk_link.name = (char *)sd;
 462         }
 463
 464         err = page_symlink(inode, disk_link.name, disk_link.len);
 465
 466 err_out:
 467         d_instantiate(dentry, inode);
 468         unlock_new_inode(inode);
 469
 470         /*
 471          * Let's flush symlink data in order to avoid broken symlink as much as
 472          * possible. Nevertheless, fsyncing is the best way, but there is no
 473          * way to get a file descriptor in order to flush that.
 474          *
 475          * Note that, it needs to do dir->fsync to make this recoverable.
 476          * If the symlink path is stored into inline_data, there is no
 477          * performance regression.
 478          */
 479         if (!err) {
 480                 filemap_write_and_wait_range(inode->i_mapping, 0,
 481                                                         disk_link.len - 1);
 482
 483                 if (IS_DIRSYNC(dir))
 484                         f2fs_sync_fs(sbi->sb, 1);
 485         } else {
 486                 f2fs_unlink(dir, dentry);
 487         }
 488
 489         kfree(sd);
 490         return err;
 491 out:
 492         handle_failed_inode(inode);
 493         return err;
 494 }
 495
 496 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 497 {
 498         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 499         struct inode *inode;
 500         int err;
 501
 502         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 503         if (IS_ERR(inode))
 504                 return PTR_ERR(inode);
 505
 506         inode->i_op = &f2fs_dir_inode_operations;
 507         inode->i_fop = &f2fs_dir_operations;
 508         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 509         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 510
 511         f2fs_balance_fs(sbi, true);
 512
 513         set_inode_flag(inode, FI_INC_LINK);
 514         f2fs_lock_op(sbi);
 515         err = f2fs_add_link(dentry, inode);
 516         if (err)
 517                 goto out_fail;
 518         f2fs_unlock_op(sbi);
 519
 520         alloc_nid_done(sbi, inode->i_ino);
 521
 522         d_instantiate(dentry, inode);
 523         unlock_new_inode(inode);
 524
 525         if (IS_DIRSYNC(dir))
 526                 f2fs_sync_fs(sbi->sb, 1);
 527         return 0;
 528
 529 out_fail:
 530         clear_inode_flag(inode, FI_INC_LINK);
 531         handle_failed_inode(inode);
 532         return err;
 533 }
 534
 535 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 536 {
 537         struct inode *inode = d_inode(dentry);
 538         if (f2fs_empty_dir(inode))
 539                 return f2fs_unlink(dir, dentry);
 540         return -ENOTEMPTY;
 541 }
 542
 543 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 544                                 umode_t mode, dev_t rdev)
 545 {
 546         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 547         struct inode *inode;
 548         int err = 0;
 549
 550         inode = f2fs_new_inode(dir, mode);
 551         if (IS_ERR(inode))
 552                 return PTR_ERR(inode);
 553
 554         init_special_inode(inode, inode->i_mode, rdev);
 555         inode->i_op = &f2fs_special_inode_operations;
 556
 557         f2fs_balance_fs(sbi, true);
 558
 559         f2fs_lock_op(sbi);
 560         err = f2fs_add_link(dentry, inode);
 561         if (err)
 562                 goto out;
 563         f2fs_unlock_op(sbi);
 564
 565         alloc_nid_done(sbi, inode->i_ino);
 566
 567         d_instantiate(dentry, inode);
 568         unlock_new_inode(inode);
 569
 570         if (IS_DIRSYNC(dir))
 571                 f2fs_sync_fs(sbi->sb, 1);
 572         return 0;
 573 out:
 574         handle_failed_inode(inode);
 575         return err;
 576 }
 577
 578 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 579                                         umode_t mode, struct inode **whiteout)
 580 {
 581         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 582         struct inode *inode;
 583         int err;
 584
 585         inode = f2fs_new_inode(dir, mode);
 586         if (IS_ERR(inode))
 587                 return PTR_ERR(inode);
 588
 589         if (whiteout) {
 590                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 591                 inode->i_op = &f2fs_special_inode_operations;
 592         } else {
 593                 inode->i_op = &f2fs_file_inode_operations;
 594                 inode->i_fop = &f2fs_file_operations;
 595                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 596         }
 597
 598         f2fs_balance_fs(sbi, true);
 599
 600         f2fs_lock_op(sbi);
 601         err = acquire_orphan_inode(sbi);
 602         if (err)
 603                 goto out;
 604
 605         err = f2fs_do_tmpfile(inode, dir);
 606         if (err)
 607                 goto release_out;
 608
 609         /*
 610          * add this non-linked tmpfile to orphan list, in this way we could
 611          * remove all unused data of tmpfile after abnormal power-off.
 612          */
 613         add_orphan_inode(inode);
 614         alloc_nid_done(sbi, inode->i_ino);
 615
 616         if (whiteout) {
 617                 f2fs_i_links_write(inode, false);
 618                 *whiteout = inode;
 619         } else {
 620                 d_tmpfile(dentry, inode);
 621         }
 622         /* link_count was changed by d_tmpfile as well. */
 623         f2fs_unlock_op(sbi);
 624         unlock_new_inode(inode);
 625         return 0;
 626
 627 release_out:
 628         release_orphan_inode(sbi);
 629 out:
 630         handle_failed_inode(inode);
 631         return err;
 632 }
 633
 634 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 635 {
 636         if (f2fs_encrypted_inode(dir)) {
 637                 int err = fscrypt_get_encryption_info(dir);
 638                 if (err)
 639                         return err;
 640         }
 641
 642         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 643 }
 644
 645 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 646 {
 647         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 648 }
 649
 650 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 651                         struct inode *new_dir, struct dentry *new_dentry,
 652                         unsigned int flags)
 653 {
 654         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 655         struct inode *old_inode = d_inode(old_dentry);
 656         struct inode *new_inode = d_inode(new_dentry);
 657         struct inode *whiteout = NULL;
 658         struct page *old_dir_page;
 659         struct page *old_page, *new_page = NULL;
 660         struct f2fs_dir_entry *old_dir_entry = NULL;
 661         struct f2fs_dir_entry *old_entry;
 662         struct f2fs_dir_entry *new_entry;
 663         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 664         int err = -ENOENT;
 665
 666         if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
 667                         !fscrypt_has_permitted_context(new_dir, old_inode)) {
 668                 err = -EPERM;
 669                 goto out;
 670         }
 671
 672         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 673         if (!old_entry) {
 674                 if (IS_ERR(old_page))
 675                         err = PTR_ERR(old_page);
 676                 goto out;
 677         }
 678
 679         if (S_ISDIR(old_inode->i_mode)) {
 680                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 681                 if (!old_dir_entry) {
 682                         if (IS_ERR(old_dir_page))
 683                                 err = PTR_ERR(old_dir_page);
 684                         goto out_old;
 685                 }
 686         }
 687
 688         if (flags & RENAME_WHITEOUT) {
 689                 err = f2fs_create_whiteout(old_dir, &whiteout);
 690                 if (err)
 691                         goto out_dir;
 692         }
 693
 694         if (new_inode) {
 695
 696                 err = -ENOTEMPTY;
 697                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 698                         goto out_whiteout;
 699
 700                 err = -ENOENT;
 701                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 702                                                 &new_page);
 703                 if (!new_entry) {
 704                         if (IS_ERR(new_page))
 705                                 err = PTR_ERR(new_page);
 706                         goto out_whiteout;
 707                 }
 708
 709                 f2fs_balance_fs(sbi, true);
 710
 711                 f2fs_lock_op(sbi);
 712
 713                 err = acquire_orphan_inode(sbi);
 714                 if (err)
 715                         goto put_out_dir;
 716
 717                 err = update_dent_inode(old_inode, new_inode,
 718                                                 &new_dentry->d_name);
 719                 if (err) {
 720                         release_orphan_inode(sbi);
 721                         goto put_out_dir;
 722                 }
 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         if (new_inode && file_enc_name(new_inode))
 777                 file_set_enc_name(old_inode);
 778         up_write(&F2FS_I(old_inode)->i_sem);
 779
 780         old_inode->i_ctime = current_time(old_inode);
 781         f2fs_mark_inode_dirty_sync(old_inode, false);
 782
 783         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 784
 785         if (whiteout) {
 786                 whiteout->i_state |= I_LINKABLE;
 787                 set_inode_flag(whiteout, FI_INC_LINK);
 788                 err = f2fs_add_link(old_dentry, whiteout);
 789                 if (err)
 790                         goto put_out_dir;
 791                 whiteout->i_state &= ~I_LINKABLE;
 792                 iput(whiteout);
 793         }
 794
 795         if (old_dir_entry) {
 796                 if (old_dir != new_dir && !whiteout) {
 797                         f2fs_set_link(old_inode, old_dir_entry,
 798                                                 old_dir_page, new_dir);
 799                 } else {
 800                         f2fs_dentry_kunmap(old_inode, old_dir_page);
 801                         f2fs_put_page(old_dir_page, 0);
 802                 }
 803                 f2fs_i_links_write(old_dir, false);
 804         }
 805
 806         f2fs_unlock_op(sbi);
 807
 808         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 809                 f2fs_sync_fs(sbi->sb, 1);
 810         return 0;
 811
 812 put_out_dir:
 813         f2fs_unlock_op(sbi);
 814         if (new_page) {
 815                 f2fs_dentry_kunmap(new_dir, new_page);
 816                 f2fs_put_page(new_page, 0);
 817         }
 818 out_whiteout:
 819         if (whiteout)
 820                 iput(whiteout);
 821 out_dir:
 822         if (old_dir_entry) {
 823                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 824                 f2fs_put_page(old_dir_page, 0);
 825         }
 826 out_old:
 827         f2fs_dentry_kunmap(old_dir, old_page);
 828         f2fs_put_page(old_page, 0);
 829 out:
 830         return err;
 831 }
 832
 833 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 834                              struct inode *new_dir, struct dentry *new_dentry)
 835 {
 836         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 837         struct inode *old_inode = d_inode(old_dentry);
 838         struct inode *new_inode = d_inode(new_dentry);
 839         struct page *old_dir_page, *new_dir_page;
 840         struct page *old_page, *new_page;
 841         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
 842         struct f2fs_dir_entry *old_entry, *new_entry;
 843         int old_nlink = 0, new_nlink = 0;
 844         int err = -ENOENT;
 845
 846         if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
 847                         (old_dir != new_dir) &&
 848                         (!fscrypt_has_permitted_context(new_dir, old_inode) ||
 849                          !fscrypt_has_permitted_context(old_dir, new_inode)))
 850                 return -EPERM;
 851
 852         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 853         if (!old_entry) {
 854                 if (IS_ERR(old_page))
 855                         err = PTR_ERR(old_page);
 856                 goto out;
 857         }
 858
 859         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
 860         if (!new_entry) {
 861                 if (IS_ERR(new_page))
 862                         err = PTR_ERR(new_page);
 863                 goto out_old;
 864         }
 865
 866         /* prepare for updating ".." directory entry info later */
 867         if (old_dir != new_dir) {
 868                 if (S_ISDIR(old_inode->i_mode)) {
 869                         old_dir_entry = f2fs_parent_dir(old_inode,
 870                                                         &old_dir_page);
 871                         if (!old_dir_entry) {
 872                                 if (IS_ERR(old_dir_page))
 873                                         err = PTR_ERR(old_dir_page);
 874                                 goto out_new;
 875                         }
 876                 }
 877
 878                 if (S_ISDIR(new_inode->i_mode)) {
 879                         new_dir_entry = f2fs_parent_dir(new_inode,
 880                                                         &new_dir_page);
 881                         if (!new_dir_entry) {
 882                                 if (IS_ERR(new_dir_page))
 883                                         err = PTR_ERR(new_dir_page);
 884                                 goto out_old_dir;
 885                         }
 886                 }
 887         }
 888
 889         /*
 890          * If cross rename between file and directory those are not
 891          * in the same directory, we will inc nlink of file's parent
 892          * later, so we should check upper boundary of its nlink.
 893          */
 894         if ((!old_dir_entry || !new_dir_entry) &&
 895                                 old_dir_entry != new_dir_entry) {
 896                 old_nlink = old_dir_entry ? -1 : 1;
 897                 new_nlink = -old_nlink;
 898                 err = -EMLINK;
 899                 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
 900                         (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
 901                         goto out_new_dir;
 902         }
 903
 904         f2fs_balance_fs(sbi, true);
 905
 906         f2fs_lock_op(sbi);
 907
 908         err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
 909         if (err)
 910                 goto out_unlock;
 911         if (file_enc_name(new_inode))
 912                 file_set_enc_name(old_inode);
 913
 914         err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
 915         if (err)
 916                 goto out_undo;
 917         if (file_enc_name(old_inode))
 918                 file_set_enc_name(new_inode);
 919
 920         /* update ".." directory entry info of old dentry */
 921         if (old_dir_entry)
 922                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
 923
 924         /* update ".." directory entry info of new dentry */
 925         if (new_dir_entry)
 926                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
 927
 928         /* update directory entry info of old dir inode */
 929         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
 930
 931         down_write(&F2FS_I(old_inode)->i_sem);
 932         file_lost_pino(old_inode);
 933         up_write(&F2FS_I(old_inode)->i_sem);
 934
 935         old_dir->i_ctime = current_time(old_dir);
 936         if (old_nlink) {
 937                 down_write(&F2FS_I(old_dir)->i_sem);
 938                 f2fs_i_links_write(old_dir, old_nlink > 0);
 939                 up_write(&F2FS_I(old_dir)->i_sem);
 940         }
 941         f2fs_mark_inode_dirty_sync(old_dir, false);
 942
 943         /* update directory entry info of new dir inode */
 944         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 945
 946         down_write(&F2FS_I(new_inode)->i_sem);
 947         file_lost_pino(new_inode);
 948         up_write(&F2FS_I(new_inode)->i_sem);
 949
 950         new_dir->i_ctime = current_time(new_dir);
 951         if (new_nlink) {
 952                 down_write(&F2FS_I(new_dir)->i_sem);
 953                 f2fs_i_links_write(new_dir, new_nlink > 0);
 954                 up_write(&F2FS_I(new_dir)->i_sem);
 955         }
 956         f2fs_mark_inode_dirty_sync(new_dir, false);
 957
 958         f2fs_unlock_op(sbi);
 959
 960         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 961                 f2fs_sync_fs(sbi->sb, 1);
 962         return 0;
 963 out_undo:
 964         /*
 965          * Still we may fail to recover name info of f2fs_inode here
 966          * Drop it, once its name is set as encrypted
 967          */
 968         update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
 969 out_unlock:
 970         f2fs_unlock_op(sbi);
 971 out_new_dir:
 972         if (new_dir_entry) {
 973                 f2fs_dentry_kunmap(new_inode, new_dir_page);
 974                 f2fs_put_page(new_dir_page, 0);
 975         }
 976 out_old_dir:
 977         if (old_dir_entry) {
 978                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 979                 f2fs_put_page(old_dir_page, 0);
 980         }
 981 out_new:
 982         f2fs_dentry_kunmap(new_dir, new_page);
 983         f2fs_put_page(new_page, 0);
 984 out_old:
 985         f2fs_dentry_kunmap(old_dir, old_page);
 986         f2fs_put_page(old_page, 0);
 987 out:
 988         return err;
 989 }
 990
 991 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
 992                         struct inode *new_dir, struct dentry *new_dentry,
 993                         unsigned int flags)
 994 {
 995         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 996                 return -EINVAL;
 997
 998         if (flags & RENAME_EXCHANGE) {
 999                 return f2fs_cross_rename(old_dir, old_dentry,
1000                                          new_dir, new_dentry);
1001         }
1002         /*
1003          * VFS has already handled the new dentry existence case,
1004          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1005          */
1006         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1007 }
1008
1009 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1010                                            struct inode *inode,
1011                                            struct delayed_call *done)
1012 {
1013         struct page *cpage = NULL;
1014         char *caddr, *paddr = NULL;
1015         struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1016         struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1017         struct fscrypt_symlink_data *sd;
1018         u32 max_size = inode->i_sb->s_blocksize;
1019         int res;
1020
1021         if (!dentry)
1022                 return ERR_PTR(-ECHILD);
1023
1024         res = fscrypt_get_encryption_info(inode);
1025         if (res)
1026                 return ERR_PTR(res);
1027
1028         cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1029         if (IS_ERR(cpage))
1030                 return ERR_CAST(cpage);
1031         caddr = page_address(cpage);
1032
1033         /* Symlink is encrypted */
1034         sd = (struct fscrypt_symlink_data *)caddr;
1035         cstr.name = sd->encrypted_path;
1036         cstr.len = le16_to_cpu(sd->len);
1037
1038         /* this is broken symlink case */
1039         if (unlikely(cstr.len == 0)) {
1040                 res = -ENOENT;
1041                 goto errout;
1042         }
1043
1044         if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1045                 /* Symlink data on the disk is corrupted */
1046                 res = -EIO;
1047                 goto errout;
1048         }
1049         res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1050         if (res)
1051                 goto errout;
1052
1053         res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1054         if (res)
1055                 goto errout;
1056
1057         /* this is broken symlink case */
1058         if (unlikely(pstr.name[0] == 0)) {
1059                 res = -ENOENT;
1060                 goto errout;
1061         }
1062
1063         paddr = pstr.name;
1064
1065         /* Null-terminate the name */
1066         paddr[pstr.len] = '\0';
1067
1068         put_page(cpage);
1069         set_delayed_call(done, kfree_link, paddr);
1070         return paddr;
1071 errout:
1072         fscrypt_fname_free_buffer(&pstr);
1073         put_page(cpage);
1074         return ERR_PTR(res);
1075 }
1076
1077 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1078         .readlink       = generic_readlink,
1079         .get_link       = f2fs_encrypted_get_link,
1080         .getattr        = f2fs_getattr,
1081         .setattr        = f2fs_setattr,
1082 #ifdef CONFIG_F2FS_FS_XATTR
1083         .listxattr      = f2fs_listxattr,
1084 #endif
1085 };
1086
1087 const struct inode_operations f2fs_dir_inode_operations = {
1088         .create         = f2fs_create,
1089         .lookup         = f2fs_lookup,
1090         .link           = f2fs_link,
1091         .unlink         = f2fs_unlink,
1092         .symlink        = f2fs_symlink,
1093         .mkdir          = f2fs_mkdir,
1094         .rmdir          = f2fs_rmdir,
1095         .mknod          = f2fs_mknod,
1096         .rename         = f2fs_rename2,
1097         .tmpfile        = f2fs_tmpfile,
1098         .getattr        = f2fs_getattr,
1099         .setattr        = f2fs_setattr,
1100         .get_acl        = f2fs_get_acl,
1101         .set_acl        = f2fs_set_acl,
1102 #ifdef CONFIG_F2FS_FS_XATTR
1103         .listxattr      = f2fs_listxattr,
1104 #endif
1105 };
1106
1107 const struct inode_operations f2fs_symlink_inode_operations = {
1108         .readlink       = generic_readlink,
1109         .get_link       = f2fs_get_link,
1110         .getattr        = f2fs_getattr,
1111         .setattr        = f2fs_setattr,
1112 #ifdef CONFIG_F2FS_FS_XATTR
1113         .listxattr      = f2fs_listxattr,
1114 #endif
1115 };
1116
1117 const struct inode_operations f2fs_special_inode_operations = {
1118         .getattr        = f2fs_getattr,
1119         .setattr        = f2fs_setattr,
1120         .get_acl        = f2fs_get_acl,
1121         .set_acl        = f2fs_set_acl,
1122 #ifdef CONFIG_F2FS_FS_XATTR
1123         .listxattr      = f2fs_listxattr,
1124 #endif
1125 };