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