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 err;
  33
  34         inode = new_inode(dir->i_sb);
  35         if (!inode)
  36                 return ERR_PTR(-ENOMEM);
  37
  38         f2fs_lock_op(sbi);
  39         if (!alloc_nid(sbi, &ino)) {
  40                 f2fs_unlock_op(sbi);
  41                 err = -ENOSPC;
  42                 goto fail;
  43         }
  44         f2fs_unlock_op(sbi);
  45
  46         nid_free = true;
  47
  48         inode_init_owner(inode, dir, mode);
  49
  50         inode->i_ino = ino;
  51         inode->i_blocks = 0;
  52         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
  53         inode->i_generation = sbi->s_next_generation++;
  54
  55         err = insert_inode_locked(inode);
  56         if (err) {
  57                 err = -EINVAL;
  58                 goto fail;
  59         }
  60
  61         err = dquot_initialize(inode);
  62         if (err)
  63                 goto fail_drop;
  64
  65         err = dquot_alloc_inode(inode);
  66         if (err)
  67                 goto fail_drop;
  68
  69         /* If the directory encrypted, then we should encrypt the inode. */
  70         if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
  71                 f2fs_set_encrypted_inode(inode);
  72
  73         set_inode_flag(inode, FI_NEW_INODE);
  74
  75         if (f2fs_sb_has_extra_attr(sbi->sb)) {
  76                 set_inode_flag(inode, FI_EXTRA_ATTR);
  77                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  78         }
  79
  80         if (test_opt(sbi, INLINE_XATTR))
  81                 set_inode_flag(inode, FI_INLINE_XATTR);
  82         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  83                 set_inode_flag(inode, FI_INLINE_DATA);
  84         if (f2fs_may_inline_dentry(inode))
  85                 set_inode_flag(inode, FI_INLINE_DENTRY);
  86
  87         f2fs_init_extent_tree(inode, NULL);
  88
  89         stat_inc_inline_xattr(inode);
  90         stat_inc_inline_inode(inode);
  91         stat_inc_inline_dir(inode);
  92
  93         trace_f2fs_new_inode(inode, 0);
  94         return inode;
  95
  96 fail:
  97         trace_f2fs_new_inode(inode, err);
  98         make_bad_inode(inode);
  99         if (nid_free)
 100                 set_inode_flag(inode, FI_FREE_NID);
 101         iput(inode);
 102         return ERR_PTR(err);
 103 fail_drop:
 104         trace_f2fs_new_inode(inode, err);
 105         dquot_drop(inode);
 106         inode->i_flags |= S_NOQUOTA;
 107         if (nid_free)
 108                 set_inode_flag(inode, FI_FREE_NID);
 109         clear_nlink(inode);
 110         unlock_new_inode(inode);
 111         iput(inode);
 112         return ERR_PTR(err);
 113 }
 114
 115 static int is_multimedia_file(const unsigned char *s, const char *sub)
 116 {
 117         size_t slen = strlen(s);
 118         size_t sublen = strlen(sub);
 119         int i;
 120
 121         /*
 122          * filename format of multimedia file should be defined as:
 123          * "filename + '.' + extension + (optional: '.' + temp extension)".
 124          */
 125         if (slen < sublen + 2)
 126                 return 0;
 127
 128         for (i = 1; i < slen - sublen; i++) {
 129                 if (s[i] != '.')
 130                         continue;
 131                 if (!strncasecmp(s + i + 1, sub, sublen))
 132                         return 1;
 133         }
 134
 135         return 0;
 136 }
 137
 138 /*
 139  * Set multimedia files as cold files for hot/cold data separation
 140  */
 141 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
 142                 const unsigned char *name)
 143 {
 144         int i;
 145         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 146
 147         int count = le32_to_cpu(sbi->raw_super->extension_count);
 148         for (i = 0; i < count; i++) {
 149                 if (is_multimedia_file(name, extlist[i])) {
 150                         file_set_cold(inode);
 151                         break;
 152                 }
 153         }
 154 }
 155
 156 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 157                                                 bool excl)
 158 {
 159         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 160         struct inode *inode;
 161         nid_t ino = 0;
 162         int err;
 163
 164         err = dquot_initialize(dir);
 165         if (err)
 166                 return err;
 167
 168         inode = f2fs_new_inode(dir, mode);
 169         if (IS_ERR(inode))
 170                 return PTR_ERR(inode);
 171
 172         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 173                 set_cold_files(sbi, inode, dentry->d_name.name);
 174
 175         inode->i_op = &f2fs_file_inode_operations;
 176         inode->i_fop = &f2fs_file_operations;
 177         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 178         ino = inode->i_ino;
 179
 180         f2fs_lock_op(sbi);
 181         err = f2fs_add_link(dentry, inode);
 182         if (err)
 183                 goto out;
 184         f2fs_unlock_op(sbi);
 185
 186         alloc_nid_done(sbi, ino);
 187
 188         d_instantiate(dentry, inode);
 189         unlock_new_inode(inode);
 190
 191         if (IS_DIRSYNC(dir))
 192                 f2fs_sync_fs(sbi->sb, 1);
 193
 194         f2fs_balance_fs(sbi, true);
 195         return 0;
 196 out:
 197         handle_failed_inode(inode);
 198         return err;
 199 }
 200
 201 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 202                 struct dentry *dentry)
 203 {
 204         struct inode *inode = d_inode(old_dentry);
 205         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 206         int err;
 207
 208         if (f2fs_encrypted_inode(dir) &&
 209                         !fscrypt_has_permitted_context(dir, inode))
 210                 return -EPERM;
 211
 212         err = dquot_initialize(dir);
 213         if (err)
 214                 return err;
 215
 216         f2fs_balance_fs(sbi, true);
 217
 218         inode->i_ctime = current_time(inode);
 219         ihold(inode);
 220
 221         set_inode_flag(inode, FI_INC_LINK);
 222         f2fs_lock_op(sbi);
 223         err = f2fs_add_link(dentry, inode);
 224         if (err)
 225                 goto out;
 226         f2fs_unlock_op(sbi);
 227
 228         d_instantiate(dentry, inode);
 229
 230         if (IS_DIRSYNC(dir))
 231                 f2fs_sync_fs(sbi->sb, 1);
 232         return 0;
 233 out:
 234         clear_inode_flag(inode, FI_INC_LINK);
 235         iput(inode);
 236         f2fs_unlock_op(sbi);
 237         return err;
 238 }
 239
 240 struct dentry *f2fs_get_parent(struct dentry *child)
 241 {
 242         struct qstr dotdot = QSTR_INIT("..", 2);
 243         struct page *page;
 244         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 245         if (!ino) {
 246                 if (IS_ERR(page))
 247                         return ERR_CAST(page);
 248                 return ERR_PTR(-ENOENT);
 249         }
 250         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 251 }
 252
 253 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 254 {
 255         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 256         struct qstr dot = QSTR_INIT(".", 1);
 257         struct qstr dotdot = QSTR_INIT("..", 2);
 258         struct f2fs_dir_entry *de;
 259         struct page *page;
 260         int err = 0;
 261
 262         if (f2fs_readonly(sbi->sb)) {
 263                 f2fs_msg(sbi->sb, KERN_INFO,
 264                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 265                         "in readonly mountpoint", dir->i_ino, pino);
 266                 return 0;
 267         }
 268
 269         err = dquot_initialize(dir);
 270         if (err)
 271                 return err;
 272
 273         f2fs_balance_fs(sbi, true);
 274
 275         f2fs_lock_op(sbi);
 276
 277         de = f2fs_find_entry(dir, &dot, &page);
 278         if (de) {
 279                 f2fs_dentry_kunmap(dir, page);
 280                 f2fs_put_page(page, 0);
 281         } else if (IS_ERR(page)) {
 282                 err = PTR_ERR(page);
 283                 goto out;
 284         } else {
 285                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 286                 if (err)
 287                         goto out;
 288         }
 289
 290         de = f2fs_find_entry(dir, &dotdot, &page);
 291         if (de) {
 292                 f2fs_dentry_kunmap(dir, page);
 293                 f2fs_put_page(page, 0);
 294         } else if (IS_ERR(page)) {
 295                 err = PTR_ERR(page);
 296         } else {
 297                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 298         }
 299 out:
 300         if (!err)
 301                 clear_inode_flag(dir, FI_INLINE_DOTS);
 302
 303         f2fs_unlock_op(sbi);
 304         return err;
 305 }
 306
 307 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 308                 unsigned int flags)
 309 {
 310         struct inode *inode = NULL;
 311         struct f2fs_dir_entry *de;
 312         struct page *page;
 313         nid_t ino;
 314         int err = 0;
 315         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 316
 317         if (f2fs_encrypted_inode(dir)) {
 318                 int res = fscrypt_get_encryption_info(dir);
 319
 320                 /*
 321                  * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
 322                  * created while the directory was encrypted and we
 323                  * don't have access to the key.
 324                  */
 325                 if (fscrypt_has_encryption_key(dir))
 326                         fscrypt_set_encrypted_dentry(dentry);
 327                 fscrypt_set_d_op(dentry);
 328                 if (res && res != -ENOKEY)
 329                         return ERR_PTR(res);
 330         }
 331
 332         if (dentry->d_name.len > F2FS_NAME_LEN)
 333                 return ERR_PTR(-ENAMETOOLONG);
 334
 335         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 336         if (!de) {
 337                 if (IS_ERR(page))
 338                         return (struct dentry *)page;
 339                 return d_splice_alias(inode, dentry);
 340         }
 341
 342         ino = le32_to_cpu(de->ino);
 343         f2fs_dentry_kunmap(dir, page);
 344         f2fs_put_page(page, 0);
 345
 346         inode = f2fs_iget(dir->i_sb, ino);
 347         if (IS_ERR(inode))
 348                 return ERR_CAST(inode);
 349
 350         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 351                 err = __recover_dot_dentries(dir, root_ino);
 352                 if (err)
 353                         goto err_out;
 354         }
 355
 356         if (f2fs_has_inline_dots(inode)) {
 357                 err = __recover_dot_dentries(inode, dir->i_ino);
 358                 if (err)
 359                         goto err_out;
 360         }
 361         if (f2fs_encrypted_inode(dir) &&
 362             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 363             !fscrypt_has_permitted_context(dir, inode)) {
 364                 f2fs_msg(inode->i_sb, KERN_WARNING,
 365                          "Inconsistent encryption contexts: %lu/%lu",
 366                          dir->i_ino, inode->i_ino);
 367                 err = -EPERM;
 368                 goto err_out;
 369         }
 370         return d_splice_alias(inode, dentry);
 371
 372 err_out:
 373         iput(inode);
 374         return ERR_PTR(err);
 375 }
 376
 377 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 378 {
 379         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 380         struct inode *inode = d_inode(dentry);
 381         struct f2fs_dir_entry *de;
 382         struct page *page;
 383         int err = -ENOENT;
 384
 385         trace_f2fs_unlink_enter(dir, dentry);
 386
 387         err = dquot_initialize(dir);
 388         if (err)
 389                 return err;
 390
 391         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 392         if (!de) {
 393                 if (IS_ERR(page))
 394                         err = PTR_ERR(page);
 395                 goto fail;
 396         }
 397
 398         f2fs_balance_fs(sbi, true);
 399
 400         f2fs_lock_op(sbi);
 401         err = acquire_orphan_inode(sbi);
 402         if (err) {
 403                 f2fs_unlock_op(sbi);
 404                 f2fs_dentry_kunmap(dir, page);
 405                 f2fs_put_page(page, 0);
 406                 goto fail;
 407         }
 408         f2fs_delete_entry(de, page, dir, inode);
 409         f2fs_unlock_op(sbi);
 410
 411         if (IS_DIRSYNC(dir))
 412                 f2fs_sync_fs(sbi->sb, 1);
 413 fail:
 414         trace_f2fs_unlink_exit(inode, err);
 415         return err;
 416 }
 417
 418 static const char *f2fs_get_link(struct dentry *dentry,
 419                                  struct inode *inode,
 420                                  struct delayed_call *done)
 421 {
 422         const char *link = page_get_link(dentry, inode, done);
 423         if (!IS_ERR(link) && !*link) {
 424                 /* this is broken symlink case */
 425                 do_delayed_call(done);
 426                 clear_delayed_call(done);
 427                 link = ERR_PTR(-ENOENT);
 428         }
 429         return link;
 430 }
 431
 432 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 433                                         const char *symname)
 434 {
 435         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 436         struct inode *inode;
 437         size_t len = strlen(symname);
 438         struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
 439         struct fscrypt_symlink_data *sd = NULL;
 440         int err;
 441
 442         if (f2fs_encrypted_inode(dir)) {
 443                 err = fscrypt_get_encryption_info(dir);
 444                 if (err)
 445                         return err;
 446
 447                 if (!fscrypt_has_encryption_key(dir))
 448                         return -ENOKEY;
 449
 450                 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
 451                                 sizeof(struct fscrypt_symlink_data));
 452         }
 453
 454         if (disk_link.len > dir->i_sb->s_blocksize)
 455                 return -ENAMETOOLONG;
 456
 457         err = dquot_initialize(dir);
 458         if (err)
 459                 return err;
 460
 461         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 462         if (IS_ERR(inode))
 463                 return PTR_ERR(inode);
 464
 465         if (f2fs_encrypted_inode(inode))
 466                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 467         else
 468                 inode->i_op = &f2fs_symlink_inode_operations;
 469         inode_nohighmem(inode);
 470         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 471
 472         f2fs_lock_op(sbi);
 473         err = f2fs_add_link(dentry, inode);
 474         if (err)
 475                 goto out;
 476         f2fs_unlock_op(sbi);
 477         alloc_nid_done(sbi, inode->i_ino);
 478
 479         if (f2fs_encrypted_inode(inode)) {
 480                 struct qstr istr = QSTR_INIT(symname, len);
 481                 struct fscrypt_str ostr;
 482
 483                 sd = kzalloc(disk_link.len, GFP_NOFS);
 484                 if (!sd) {
 485                         err = -ENOMEM;
 486                         goto err_out;
 487                 }
 488
 489                 err = fscrypt_get_encryption_info(inode);
 490                 if (err)
 491                         goto err_out;
 492
 493                 if (!fscrypt_has_encryption_key(inode)) {
 494                         err = -ENOKEY;
 495                         goto err_out;
 496                 }
 497
 498                 ostr.name = sd->encrypted_path;
 499                 ostr.len = disk_link.len;
 500                 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
 501                 if (err)
 502                         goto err_out;
 503
 504                 sd->len = cpu_to_le16(ostr.len);
 505                 disk_link.name = (char *)sd;
 506         }
 507
 508         err = page_symlink(inode, disk_link.name, disk_link.len);
 509
 510 err_out:
 511         d_instantiate(dentry, inode);
 512         unlock_new_inode(inode);
 513
 514         /*
 515          * Let's flush symlink data in order to avoid broken symlink as much as
 516          * possible. Nevertheless, fsyncing is the best way, but there is no
 517          * way to get a file descriptor in order to flush that.
 518          *
 519          * Note that, it needs to do dir->fsync to make this recoverable.
 520          * If the symlink path is stored into inline_data, there is no
 521          * performance regression.
 522          */
 523         if (!err) {
 524                 filemap_write_and_wait_range(inode->i_mapping, 0,
 525                                                         disk_link.len - 1);
 526
 527                 if (IS_DIRSYNC(dir))
 528                         f2fs_sync_fs(sbi->sb, 1);
 529         } else {
 530                 f2fs_unlink(dir, dentry);
 531         }
 532
 533         kfree(sd);
 534
 535         f2fs_balance_fs(sbi, true);
 536         return err;
 537 out:
 538         handle_failed_inode(inode);
 539         return err;
 540 }
 541
 542 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 543 {
 544         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 545         struct inode *inode;
 546         int err;
 547
 548         err = dquot_initialize(dir);
 549         if (err)
 550                 return err;
 551
 552         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 553         if (IS_ERR(inode))
 554                 return PTR_ERR(inode);
 555
 556         inode->i_op = &f2fs_dir_inode_operations;
 557         inode->i_fop = &f2fs_dir_operations;
 558         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 559         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 560
 561         set_inode_flag(inode, FI_INC_LINK);
 562         f2fs_lock_op(sbi);
 563         err = f2fs_add_link(dentry, inode);
 564         if (err)
 565                 goto out_fail;
 566         f2fs_unlock_op(sbi);
 567
 568         alloc_nid_done(sbi, inode->i_ino);
 569
 570         d_instantiate(dentry, inode);
 571         unlock_new_inode(inode);
 572
 573         if (IS_DIRSYNC(dir))
 574                 f2fs_sync_fs(sbi->sb, 1);
 575
 576         f2fs_balance_fs(sbi, true);
 577         return 0;
 578
 579 out_fail:
 580         clear_inode_flag(inode, FI_INC_LINK);
 581         handle_failed_inode(inode);
 582         return err;
 583 }
 584
 585 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 586 {
 587         struct inode *inode = d_inode(dentry);
 588         if (f2fs_empty_dir(inode))
 589                 return f2fs_unlink(dir, dentry);
 590         return -ENOTEMPTY;
 591 }
 592
 593 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 594                                 umode_t mode, dev_t rdev)
 595 {
 596         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 597         struct inode *inode;
 598         int err = 0;
 599
 600         err = dquot_initialize(dir);
 601         if (err)
 602                 return err;
 603
 604         inode = f2fs_new_inode(dir, mode);
 605         if (IS_ERR(inode))
 606                 return PTR_ERR(inode);
 607
 608         init_special_inode(inode, inode->i_mode, rdev);
 609         inode->i_op = &f2fs_special_inode_operations;
 610
 611         f2fs_lock_op(sbi);
 612         err = f2fs_add_link(dentry, inode);
 613         if (err)
 614                 goto out;
 615         f2fs_unlock_op(sbi);
 616
 617         alloc_nid_done(sbi, inode->i_ino);
 618
 619         d_instantiate(dentry, inode);
 620         unlock_new_inode(inode);
 621
 622         if (IS_DIRSYNC(dir))
 623                 f2fs_sync_fs(sbi->sb, 1);
 624
 625         f2fs_balance_fs(sbi, true);
 626         return 0;
 627 out:
 628         handle_failed_inode(inode);
 629         return err;
 630 }
 631
 632 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 633                                         umode_t mode, struct inode **whiteout)
 634 {
 635         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 636         struct inode *inode;
 637         int err;
 638
 639         err = dquot_initialize(dir);
 640         if (err)
 641                 return err;
 642
 643         inode = f2fs_new_inode(dir, mode);
 644         if (IS_ERR(inode))
 645                 return PTR_ERR(inode);
 646
 647         if (whiteout) {
 648                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 649                 inode->i_op = &f2fs_special_inode_operations;
 650         } else {
 651                 inode->i_op = &f2fs_file_inode_operations;
 652                 inode->i_fop = &f2fs_file_operations;
 653                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 654         }
 655
 656         f2fs_lock_op(sbi);
 657         err = acquire_orphan_inode(sbi);
 658         if (err)
 659                 goto out;
 660
 661         err = f2fs_do_tmpfile(inode, dir);
 662         if (err)
 663                 goto release_out;
 664
 665         /*
 666          * add this non-linked tmpfile to orphan list, in this way we could
 667          * remove all unused data of tmpfile after abnormal power-off.
 668          */
 669         add_orphan_inode(inode);
 670         alloc_nid_done(sbi, inode->i_ino);
 671
 672         if (whiteout) {
 673                 f2fs_i_links_write(inode, false);
 674                 *whiteout = inode;
 675         } else {
 676                 d_tmpfile(dentry, inode);
 677         }
 678         /* link_count was changed by d_tmpfile as well. */
 679         f2fs_unlock_op(sbi);
 680         unlock_new_inode(inode);
 681
 682         f2fs_balance_fs(sbi, true);
 683         return 0;
 684
 685 release_out:
 686         release_orphan_inode(sbi);
 687 out:
 688         handle_failed_inode(inode);
 689         return err;
 690 }
 691
 692 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 693 {
 694         if (f2fs_encrypted_inode(dir)) {
 695                 int err = fscrypt_get_encryption_info(dir);
 696                 if (err)
 697                         return err;
 698         }
 699
 700         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 701 }
 702
 703 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 704 {
 705         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 706 }
 707
 708 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 709                         struct inode *new_dir, struct dentry *new_dentry,
 710                         unsigned int flags)
 711 {
 712         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 713         struct inode *old_inode = d_inode(old_dentry);
 714         struct inode *new_inode = d_inode(new_dentry);
 715         struct inode *whiteout = NULL;
 716         struct page *old_dir_page;
 717         struct page *old_page, *new_page = NULL;
 718         struct f2fs_dir_entry *old_dir_entry = NULL;
 719         struct f2fs_dir_entry *old_entry;
 720         struct f2fs_dir_entry *new_entry;
 721         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 722         int err = -ENOENT;
 723
 724         if ((f2fs_encrypted_inode(old_dir) &&
 725                         !fscrypt_has_encryption_key(old_dir)) ||
 726                         (f2fs_encrypted_inode(new_dir) &&
 727                         !fscrypt_has_encryption_key(new_dir)))
 728                 return -ENOKEY;
 729
 730         if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
 731                         !fscrypt_has_permitted_context(new_dir, old_inode)) {
 732                 err = -EPERM;
 733                 goto out;
 734         }
 735
 736         err = dquot_initialize(old_dir);
 737         if (err)
 738                 goto out;
 739
 740         err = dquot_initialize(new_dir);
 741         if (err)
 742                 goto out;
 743
 744         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 745         if (!old_entry) {
 746                 if (IS_ERR(old_page))
 747                         err = PTR_ERR(old_page);
 748                 goto out;
 749         }
 750
 751         if (S_ISDIR(old_inode->i_mode)) {
 752                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 753                 if (!old_dir_entry) {
 754                         if (IS_ERR(old_dir_page))
 755                                 err = PTR_ERR(old_dir_page);
 756                         goto out_old;
 757                 }
 758         }
 759
 760         if (flags & RENAME_WHITEOUT) {
 761                 err = f2fs_create_whiteout(old_dir, &whiteout);
 762                 if (err)
 763                         goto out_dir;
 764         }
 765
 766         if (new_inode) {
 767
 768                 err = -ENOTEMPTY;
 769                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 770                         goto out_whiteout;
 771
 772                 err = -ENOENT;
 773                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 774                                                 &new_page);
 775                 if (!new_entry) {
 776                         if (IS_ERR(new_page))
 777                                 err = PTR_ERR(new_page);
 778                         goto out_whiteout;
 779                 }
 780
 781                 f2fs_balance_fs(sbi, true);
 782
 783                 f2fs_lock_op(sbi);
 784
 785                 err = acquire_orphan_inode(sbi);
 786                 if (err)
 787                         goto put_out_dir;
 788
 789                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 790
 791                 new_inode->i_ctime = current_time(new_inode);
 792                 down_write(&F2FS_I(new_inode)->i_sem);
 793                 if (old_dir_entry)
 794                         f2fs_i_links_write(new_inode, false);
 795                 f2fs_i_links_write(new_inode, false);
 796                 up_write(&F2FS_I(new_inode)->i_sem);
 797
 798                 if (!new_inode->i_nlink)
 799                         add_orphan_inode(new_inode);
 800                 else
 801                         release_orphan_inode(sbi);
 802         } else {
 803                 f2fs_balance_fs(sbi, true);
 804
 805                 f2fs_lock_op(sbi);
 806
 807                 err = f2fs_add_link(new_dentry, old_inode);
 808                 if (err) {
 809                         f2fs_unlock_op(sbi);
 810                         goto out_whiteout;
 811                 }
 812
 813                 if (old_dir_entry)
 814                         f2fs_i_links_write(new_dir, true);
 815
 816                 /*
 817                  * old entry and new entry can locate in the same inline
 818                  * dentry in inode, when attaching new entry in inline dentry,
 819                  * it could force inline dentry conversion, after that,
 820                  * old_entry and old_page will point to wrong address, in
 821                  * order to avoid this, let's do the check and update here.
 822                  */
 823                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 824                         f2fs_put_page(old_page, 0);
 825                         old_page = NULL;
 826
 827                         old_entry = f2fs_find_entry(old_dir,
 828                                                 &old_dentry->d_name, &old_page);
 829                         if (!old_entry) {
 830                                 err = -ENOENT;
 831                                 if (IS_ERR(old_page))
 832                                         err = PTR_ERR(old_page);
 833                                 f2fs_unlock_op(sbi);
 834                                 goto out_whiteout;
 835                         }
 836                 }
 837         }
 838
 839         down_write(&F2FS_I(old_inode)->i_sem);
 840         if (!old_dir_entry || whiteout)
 841                 file_lost_pino(old_inode);
 842         else
 843                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 844         up_write(&F2FS_I(old_inode)->i_sem);
 845
 846         old_inode->i_ctime = current_time(old_inode);
 847         f2fs_mark_inode_dirty_sync(old_inode, false);
 848
 849         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 850
 851         if (whiteout) {
 852                 whiteout->i_state |= I_LINKABLE;
 853                 set_inode_flag(whiteout, FI_INC_LINK);
 854                 err = f2fs_add_link(old_dentry, whiteout);
 855                 if (err)
 856                         goto put_out_dir;
 857                 whiteout->i_state &= ~I_LINKABLE;
 858                 iput(whiteout);
 859         }
 860
 861         if (old_dir_entry) {
 862                 if (old_dir != new_dir && !whiteout) {
 863                         f2fs_set_link(old_inode, old_dir_entry,
 864                                                 old_dir_page, new_dir);
 865                 } else {
 866                         f2fs_dentry_kunmap(old_inode, old_dir_page);
 867                         f2fs_put_page(old_dir_page, 0);
 868                 }
 869                 f2fs_i_links_write(old_dir, false);
 870         }
 871
 872         f2fs_unlock_op(sbi);
 873
 874         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 875                 f2fs_sync_fs(sbi->sb, 1);
 876         return 0;
 877
 878 put_out_dir:
 879         f2fs_unlock_op(sbi);
 880         if (new_page) {
 881                 f2fs_dentry_kunmap(new_dir, new_page);
 882                 f2fs_put_page(new_page, 0);
 883         }
 884 out_whiteout:
 885         if (whiteout)
 886                 iput(whiteout);
 887 out_dir:
 888         if (old_dir_entry) {
 889                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 890                 f2fs_put_page(old_dir_page, 0);
 891         }
 892 out_old:
 893         f2fs_dentry_kunmap(old_dir, old_page);
 894         f2fs_put_page(old_page, 0);
 895 out:
 896         return err;
 897 }
 898
 899 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 900                              struct inode *new_dir, struct dentry *new_dentry)
 901 {
 902         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 903         struct inode *old_inode = d_inode(old_dentry);
 904         struct inode *new_inode = d_inode(new_dentry);
 905         struct page *old_dir_page, *new_dir_page;
 906         struct page *old_page, *new_page;
 907         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
 908         struct f2fs_dir_entry *old_entry, *new_entry;
 909         int old_nlink = 0, new_nlink = 0;
 910         int err = -ENOENT;
 911
 912         if ((f2fs_encrypted_inode(old_dir) &&
 913                         !fscrypt_has_encryption_key(old_dir)) ||
 914                         (f2fs_encrypted_inode(new_dir) &&
 915                         !fscrypt_has_encryption_key(new_dir)))
 916                 return -ENOKEY;
 917
 918         if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
 919                         (old_dir != new_dir) &&
 920                         (!fscrypt_has_permitted_context(new_dir, old_inode) ||
 921                          !fscrypt_has_permitted_context(old_dir, new_inode)))
 922                 return -EPERM;
 923
 924         err = dquot_initialize(old_dir);
 925         if (err)
 926                 goto out;
 927
 928         err = dquot_initialize(new_dir);
 929         if (err)
 930                 goto out;
 931
 932         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 933         if (!old_entry) {
 934                 if (IS_ERR(old_page))
 935                         err = PTR_ERR(old_page);
 936                 goto out;
 937         }
 938
 939         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
 940         if (!new_entry) {
 941                 if (IS_ERR(new_page))
 942                         err = PTR_ERR(new_page);
 943                 goto out_old;
 944         }
 945
 946         /* prepare for updating ".." directory entry info later */
 947         if (old_dir != new_dir) {
 948                 if (S_ISDIR(old_inode->i_mode)) {
 949                         old_dir_entry = f2fs_parent_dir(old_inode,
 950                                                         &old_dir_page);
 951                         if (!old_dir_entry) {
 952                                 if (IS_ERR(old_dir_page))
 953                                         err = PTR_ERR(old_dir_page);
 954                                 goto out_new;
 955                         }
 956                 }
 957
 958                 if (S_ISDIR(new_inode->i_mode)) {
 959                         new_dir_entry = f2fs_parent_dir(new_inode,
 960                                                         &new_dir_page);
 961                         if (!new_dir_entry) {
 962                                 if (IS_ERR(new_dir_page))
 963                                         err = PTR_ERR(new_dir_page);
 964                                 goto out_old_dir;
 965                         }
 966                 }
 967         }
 968
 969         /*
 970          * If cross rename between file and directory those are not
 971          * in the same directory, we will inc nlink of file's parent
 972          * later, so we should check upper boundary of its nlink.
 973          */
 974         if ((!old_dir_entry || !new_dir_entry) &&
 975                                 old_dir_entry != new_dir_entry) {
 976                 old_nlink = old_dir_entry ? -1 : 1;
 977                 new_nlink = -old_nlink;
 978                 err = -EMLINK;
 979                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
 980                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
 981                         goto out_new_dir;
 982         }
 983
 984         f2fs_balance_fs(sbi, true);
 985
 986         f2fs_lock_op(sbi);
 987
 988         /* update ".." directory entry info of old dentry */
 989         if (old_dir_entry)
 990                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
 991
 992         /* update ".." directory entry info of new dentry */
 993         if (new_dir_entry)
 994                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
 995
 996         /* update directory entry info of old dir inode */
 997         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
 998
 999         down_write(&F2FS_I(old_inode)->i_sem);
1000         file_lost_pino(old_inode);
1001         up_write(&F2FS_I(old_inode)->i_sem);
1002
1003         old_dir->i_ctime = current_time(old_dir);
1004         if (old_nlink) {
1005                 down_write(&F2FS_I(old_dir)->i_sem);
1006                 f2fs_i_links_write(old_dir, old_nlink > 0);
1007                 up_write(&F2FS_I(old_dir)->i_sem);
1008         }
1009         f2fs_mark_inode_dirty_sync(old_dir, false);
1010
1011         /* update directory entry info of new dir inode */
1012         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1013
1014         down_write(&F2FS_I(new_inode)->i_sem);
1015         file_lost_pino(new_inode);
1016         up_write(&F2FS_I(new_inode)->i_sem);
1017
1018         new_dir->i_ctime = current_time(new_dir);
1019         if (new_nlink) {
1020                 down_write(&F2FS_I(new_dir)->i_sem);
1021                 f2fs_i_links_write(new_dir, new_nlink > 0);
1022                 up_write(&F2FS_I(new_dir)->i_sem);
1023         }
1024         f2fs_mark_inode_dirty_sync(new_dir, false);
1025
1026         f2fs_unlock_op(sbi);
1027
1028         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1029                 f2fs_sync_fs(sbi->sb, 1);
1030         return 0;
1031 out_new_dir:
1032         if (new_dir_entry) {
1033                 f2fs_dentry_kunmap(new_inode, new_dir_page);
1034                 f2fs_put_page(new_dir_page, 0);
1035         }
1036 out_old_dir:
1037         if (old_dir_entry) {
1038                 f2fs_dentry_kunmap(old_inode, old_dir_page);
1039                 f2fs_put_page(old_dir_page, 0);
1040         }
1041 out_new:
1042         f2fs_dentry_kunmap(new_dir, new_page);
1043         f2fs_put_page(new_page, 0);
1044 out_old:
1045         f2fs_dentry_kunmap(old_dir, old_page);
1046         f2fs_put_page(old_page, 0);
1047 out:
1048         return err;
1049 }
1050
1051 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1052                         struct inode *new_dir, struct dentry *new_dentry,
1053                         unsigned int flags)
1054 {
1055         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1056                 return -EINVAL;
1057
1058         if (flags & RENAME_EXCHANGE) {
1059                 return f2fs_cross_rename(old_dir, old_dentry,
1060                                          new_dir, new_dentry);
1061         }
1062         /*
1063          * VFS has already handled the new dentry existence case,
1064          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1065          */
1066         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1067 }
1068
1069 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1070                                            struct inode *inode,
1071                                            struct delayed_call *done)
1072 {
1073         struct page *cpage = NULL;
1074         char *caddr, *paddr = NULL;
1075         struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1076         struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1077         struct fscrypt_symlink_data *sd;
1078         u32 max_size = inode->i_sb->s_blocksize;
1079         int res;
1080
1081         if (!dentry)
1082                 return ERR_PTR(-ECHILD);
1083
1084         res = fscrypt_get_encryption_info(inode);
1085         if (res)
1086                 return ERR_PTR(res);
1087
1088         cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1089         if (IS_ERR(cpage))
1090                 return ERR_CAST(cpage);
1091         caddr = page_address(cpage);
1092
1093         /* Symlink is encrypted */
1094         sd = (struct fscrypt_symlink_data *)caddr;
1095         cstr.name = sd->encrypted_path;
1096         cstr.len = le16_to_cpu(sd->len);
1097
1098         /* this is broken symlink case */
1099         if (unlikely(cstr.len == 0)) {
1100                 res = -ENOENT;
1101                 goto errout;
1102         }
1103
1104         if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1105                 /* Symlink data on the disk is corrupted */
1106                 res = -EIO;
1107                 goto errout;
1108         }
1109         res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1110         if (res)
1111                 goto errout;
1112
1113         res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1114         if (res)
1115                 goto errout;
1116
1117         /* this is broken symlink case */
1118         if (unlikely(pstr.name[0] == 0)) {
1119                 res = -ENOENT;
1120                 goto errout;
1121         }
1122
1123         paddr = pstr.name;
1124
1125         /* Null-terminate the name */
1126         paddr[pstr.len] = '\0';
1127
1128         put_page(cpage);
1129         set_delayed_call(done, kfree_link, paddr);
1130         return paddr;
1131 errout:
1132         fscrypt_fname_free_buffer(&pstr);
1133         put_page(cpage);
1134         return ERR_PTR(res);
1135 }
1136
1137 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1138         .get_link       = f2fs_encrypted_get_link,
1139         .getattr        = f2fs_getattr,
1140         .setattr        = f2fs_setattr,
1141 #ifdef CONFIG_F2FS_FS_XATTR
1142         .listxattr      = f2fs_listxattr,
1143 #endif
1144 };
1145
1146 const struct inode_operations f2fs_dir_inode_operations = {
1147         .create         = f2fs_create,
1148         .lookup         = f2fs_lookup,
1149         .link           = f2fs_link,
1150         .unlink         = f2fs_unlink,
1151         .symlink        = f2fs_symlink,
1152         .mkdir          = f2fs_mkdir,
1153         .rmdir          = f2fs_rmdir,
1154         .mknod          = f2fs_mknod,
1155         .rename         = f2fs_rename2,
1156         .tmpfile        = f2fs_tmpfile,
1157         .getattr        = f2fs_getattr,
1158         .setattr        = f2fs_setattr,
1159         .get_acl        = f2fs_get_acl,
1160         .set_acl        = f2fs_set_acl,
1161 #ifdef CONFIG_F2FS_FS_XATTR
1162         .listxattr      = f2fs_listxattr,
1163 #endif
1164 };
1165
1166 const struct inode_operations f2fs_symlink_inode_operations = {
1167         .get_link       = f2fs_get_link,
1168         .getattr        = f2fs_getattr,
1169         .setattr        = f2fs_setattr,
1170 #ifdef CONFIG_F2FS_FS_XATTR
1171         .listxattr      = f2fs_listxattr,
1172 #endif
1173 };
1174
1175 const struct inode_operations f2fs_special_inode_operations = {
1176         .getattr        = f2fs_getattr,
1177         .setattr        = f2fs_setattr,
1178         .get_acl        = f2fs_get_acl,
1179         .set_acl        = f2fs_set_acl,
1180 #ifdef CONFIG_F2FS_FS_XATTR
1181         .listxattr      = f2fs_listxattr,
1182 #endif
1183 };