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         if (f2fs_sb_has_project_quota(sbi->sb) &&
  62                 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
  63                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  64         else
  65                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  66                                                         F2FS_DEF_PROJID);
  67
  68         err = dquot_initialize(inode);
  69         if (err)
  70                 goto fail_drop;
  71
  72         err = dquot_alloc_inode(inode);
  73         if (err)
  74                 goto fail_drop;
  75
  76         /* If the directory encrypted, then we should encrypt the inode. */
  77         if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
  78                 f2fs_set_encrypted_inode(inode);
  79
  80         set_inode_flag(inode, FI_NEW_INODE);
  81
  82         if (f2fs_sb_has_extra_attr(sbi->sb)) {
  83                 set_inode_flag(inode, FI_EXTRA_ATTR);
  84                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  85         }
  86
  87         if (test_opt(sbi, INLINE_XATTR))
  88                 set_inode_flag(inode, FI_INLINE_XATTR);
  89         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  90                 set_inode_flag(inode, FI_INLINE_DATA);
  91         if (f2fs_may_inline_dentry(inode))
  92                 set_inode_flag(inode, FI_INLINE_DENTRY);
  93
  94         f2fs_init_extent_tree(inode, NULL);
  95
  96         stat_inc_inline_xattr(inode);
  97         stat_inc_inline_inode(inode);
  98         stat_inc_inline_dir(inode);
  99
 100         F2FS_I(inode)->i_flags =
 101                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 102
 103         if (S_ISDIR(inode->i_mode))
 104                 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
 105
 106         if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
 107                 set_inode_flag(inode, FI_PROJ_INHERIT);
 108
 109         trace_f2fs_new_inode(inode, 0);
 110         return inode;
 111
 112 fail:
 113         trace_f2fs_new_inode(inode, err);
 114         make_bad_inode(inode);
 115         if (nid_free)
 116                 set_inode_flag(inode, FI_FREE_NID);
 117         iput(inode);
 118         return ERR_PTR(err);
 119 fail_drop:
 120         trace_f2fs_new_inode(inode, err);
 121         dquot_drop(inode);
 122         inode->i_flags |= S_NOQUOTA;
 123         if (nid_free)
 124                 set_inode_flag(inode, FI_FREE_NID);
 125         clear_nlink(inode);
 126         unlock_new_inode(inode);
 127         iput(inode);
 128         return ERR_PTR(err);
 129 }
 130
 131 static int is_multimedia_file(const unsigned char *s, const char *sub)
 132 {
 133         size_t slen = strlen(s);
 134         size_t sublen = strlen(sub);
 135         int i;
 136
 137         /*
 138          * filename format of multimedia file should be defined as:
 139          * "filename + '.' + extension + (optional: '.' + temp extension)".
 140          */
 141         if (slen < sublen + 2)
 142                 return 0;
 143
 144         for (i = 1; i < slen - sublen; i++) {
 145                 if (s[i] != '.')
 146                         continue;
 147                 if (!strncasecmp(s + i + 1, sub, sublen))
 148                         return 1;
 149         }
 150
 151         return 0;
 152 }
 153
 154 /*
 155  * Set multimedia files as cold files for hot/cold data separation
 156  */
 157 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
 158                 const unsigned char *name)
 159 {
 160         int i;
 161         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 162
 163         int count = le32_to_cpu(sbi->raw_super->extension_count);
 164         for (i = 0; i < count; i++) {
 165                 if (is_multimedia_file(name, extlist[i])) {
 166                         file_set_cold(inode);
 167                         break;
 168                 }
 169         }
 170 }
 171
 172 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 173                                                 bool excl)
 174 {
 175         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 176         struct inode *inode;
 177         nid_t ino = 0;
 178         int err;
 179
 180         err = dquot_initialize(dir);
 181         if (err)
 182                 return err;
 183
 184         inode = f2fs_new_inode(dir, mode);
 185         if (IS_ERR(inode))
 186                 return PTR_ERR(inode);
 187
 188         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 189                 set_cold_files(sbi, inode, dentry->d_name.name);
 190
 191         inode->i_op = &f2fs_file_inode_operations;
 192         inode->i_fop = &f2fs_file_operations;
 193         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 194         ino = inode->i_ino;
 195
 196         f2fs_lock_op(sbi);
 197         err = f2fs_add_link(dentry, inode);
 198         if (err)
 199                 goto out;
 200         f2fs_unlock_op(sbi);
 201
 202         alloc_nid_done(sbi, ino);
 203
 204         d_instantiate_new(dentry, inode);
 205
 206         if (IS_DIRSYNC(dir))
 207                 f2fs_sync_fs(sbi->sb, 1);
 208
 209         f2fs_balance_fs(sbi, true);
 210         return 0;
 211 out:
 212         handle_failed_inode(inode);
 213         return err;
 214 }
 215
 216 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 217                 struct dentry *dentry)
 218 {
 219         struct inode *inode = d_inode(old_dentry);
 220         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 221         int err;
 222
 223         if (f2fs_encrypted_inode(dir) &&
 224                         !fscrypt_has_permitted_context(dir, inode))
 225                 return -EXDEV;
 226
 227         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 228                         (!projid_eq(F2FS_I(dir)->i_projid,
 229                         F2FS_I(old_dentry->d_inode)->i_projid)))
 230                 return -EXDEV;
 231
 232         err = dquot_initialize(dir);
 233         if (err)
 234                 return err;
 235
 236         f2fs_balance_fs(sbi, true);
 237
 238         inode->i_ctime = current_time(inode);
 239         ihold(inode);
 240
 241         set_inode_flag(inode, FI_INC_LINK);
 242         f2fs_lock_op(sbi);
 243         err = f2fs_add_link(dentry, inode);
 244         if (err)
 245                 goto out;
 246         f2fs_unlock_op(sbi);
 247
 248         d_instantiate(dentry, inode);
 249
 250         if (IS_DIRSYNC(dir))
 251                 f2fs_sync_fs(sbi->sb, 1);
 252         return 0;
 253 out:
 254         clear_inode_flag(inode, FI_INC_LINK);
 255         iput(inode);
 256         f2fs_unlock_op(sbi);
 257         return err;
 258 }
 259
 260 struct dentry *f2fs_get_parent(struct dentry *child)
 261 {
 262         struct qstr dotdot = QSTR_INIT("..", 2);
 263         struct page *page;
 264         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 265         if (!ino) {
 266                 if (IS_ERR(page))
 267                         return ERR_CAST(page);
 268                 return ERR_PTR(-ENOENT);
 269         }
 270         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 271 }
 272
 273 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 274 {
 275         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 276         struct qstr dot = QSTR_INIT(".", 1);
 277         struct qstr dotdot = QSTR_INIT("..", 2);
 278         struct f2fs_dir_entry *de;
 279         struct page *page;
 280         int err = 0;
 281
 282         if (f2fs_readonly(sbi->sb)) {
 283                 f2fs_msg(sbi->sb, KERN_INFO,
 284                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 285                         "in readonly mountpoint", dir->i_ino, pino);
 286                 return 0;
 287         }
 288
 289         err = dquot_initialize(dir);
 290         if (err)
 291                 return err;
 292
 293         f2fs_balance_fs(sbi, true);
 294
 295         f2fs_lock_op(sbi);
 296
 297         de = f2fs_find_entry(dir, &dot, &page);
 298         if (de) {
 299                 f2fs_dentry_kunmap(dir, page);
 300                 f2fs_put_page(page, 0);
 301         } else if (IS_ERR(page)) {
 302                 err = PTR_ERR(page);
 303                 goto out;
 304         } else {
 305                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 306                 if (err)
 307                         goto out;
 308         }
 309
 310         de = f2fs_find_entry(dir, &dotdot, &page);
 311         if (de) {
 312                 f2fs_dentry_kunmap(dir, page);
 313                 f2fs_put_page(page, 0);
 314         } else if (IS_ERR(page)) {
 315                 err = PTR_ERR(page);
 316         } else {
 317                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 318         }
 319 out:
 320         if (!err)
 321                 clear_inode_flag(dir, FI_INLINE_DOTS);
 322
 323         f2fs_unlock_op(sbi);
 324         return err;
 325 }
 326
 327 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 328                 unsigned int flags)
 329 {
 330         struct inode *inode = NULL;
 331         struct f2fs_dir_entry *de;
 332         struct page *page;
 333         nid_t ino;
 334         int err = 0;
 335         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 336
 337         if (f2fs_encrypted_inode(dir)) {
 338                 int res = fscrypt_get_encryption_info(dir);
 339
 340                 /*
 341                  * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
 342                  * created while the directory was encrypted and we
 343                  * don't have access to the key.
 344                  */
 345                 if (fscrypt_has_encryption_key(dir))
 346                         fscrypt_set_encrypted_dentry(dentry);
 347                 fscrypt_set_d_op(dentry);
 348                 if (res && res != -ENOKEY)
 349                         return ERR_PTR(res);
 350         }
 351
 352         if (dentry->d_name.len > F2FS_NAME_LEN)
 353                 return ERR_PTR(-ENAMETOOLONG);
 354
 355         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 356         if (!de) {
 357                 if (IS_ERR(page))
 358                         return (struct dentry *)page;
 359                 return d_splice_alias(inode, dentry);
 360         }
 361
 362         ino = le32_to_cpu(de->ino);
 363         f2fs_dentry_kunmap(dir, page);
 364         f2fs_put_page(page, 0);
 365
 366         inode = f2fs_iget(dir->i_sb, ino);
 367         if (IS_ERR(inode))
 368                 return ERR_CAST(inode);
 369
 370         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 371                 err = __recover_dot_dentries(dir, root_ino);
 372                 if (err)
 373                         goto err_out;
 374         }
 375
 376         if (f2fs_has_inline_dots(inode)) {
 377                 err = __recover_dot_dentries(inode, dir->i_ino);
 378                 if (err)
 379                         goto err_out;
 380         }
 381         if (f2fs_encrypted_inode(dir) &&
 382             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 383             !fscrypt_has_permitted_context(dir, inode)) {
 384                 f2fs_msg(inode->i_sb, KERN_WARNING,
 385                          "Inconsistent encryption contexts: %lu/%lu",
 386                          dir->i_ino, inode->i_ino);
 387                 err = -EPERM;
 388                 goto err_out;
 389         }
 390         return d_splice_alias(inode, dentry);
 391
 392 err_out:
 393         iput(inode);
 394         return ERR_PTR(err);
 395 }
 396
 397 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 398 {
 399         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 400         struct inode *inode = d_inode(dentry);
 401         struct f2fs_dir_entry *de;
 402         struct page *page;
 403         int err = -ENOENT;
 404
 405         trace_f2fs_unlink_enter(dir, dentry);
 406
 407         err = dquot_initialize(dir);
 408         if (err)
 409                 return err;
 410
 411         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 412         if (!de) {
 413                 if (IS_ERR(page))
 414                         err = PTR_ERR(page);
 415                 goto fail;
 416         }
 417
 418         f2fs_balance_fs(sbi, true);
 419
 420         f2fs_lock_op(sbi);
 421         err = acquire_orphan_inode(sbi);
 422         if (err) {
 423                 f2fs_unlock_op(sbi);
 424                 f2fs_dentry_kunmap(dir, page);
 425                 f2fs_put_page(page, 0);
 426                 goto fail;
 427         }
 428         f2fs_delete_entry(de, page, dir, inode);
 429         f2fs_unlock_op(sbi);
 430
 431         if (IS_DIRSYNC(dir))
 432                 f2fs_sync_fs(sbi->sb, 1);
 433 fail:
 434         trace_f2fs_unlink_exit(inode, err);
 435         return err;
 436 }
 437
 438 static const char *f2fs_get_link(struct dentry *dentry,
 439                                  struct inode *inode,
 440                                  struct delayed_call *done)
 441 {
 442         const char *link = page_get_link(dentry, inode, done);
 443         if (!IS_ERR(link) && !*link) {
 444                 /* this is broken symlink case */
 445                 do_delayed_call(done);
 446                 clear_delayed_call(done);
 447                 link = ERR_PTR(-ENOENT);
 448         }
 449         return link;
 450 }
 451
 452 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 453                                         const char *symname)
 454 {
 455         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 456         struct inode *inode;
 457         size_t len = strlen(symname);
 458         struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
 459         struct fscrypt_symlink_data *sd = NULL;
 460         int err;
 461
 462         if (f2fs_encrypted_inode(dir)) {
 463                 err = fscrypt_get_encryption_info(dir);
 464                 if (err)
 465                         return err;
 466
 467                 if (!fscrypt_has_encryption_key(dir))
 468                         return -ENOKEY;
 469
 470                 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
 471                                 sizeof(struct fscrypt_symlink_data));
 472         }
 473
 474         if (disk_link.len > dir->i_sb->s_blocksize)
 475                 return -ENAMETOOLONG;
 476
 477         err = dquot_initialize(dir);
 478         if (err)
 479                 return err;
 480
 481         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 482         if (IS_ERR(inode))
 483                 return PTR_ERR(inode);
 484
 485         if (f2fs_encrypted_inode(inode))
 486                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 487         else
 488                 inode->i_op = &f2fs_symlink_inode_operations;
 489         inode_nohighmem(inode);
 490         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 491
 492         f2fs_lock_op(sbi);
 493         err = f2fs_add_link(dentry, inode);
 494         if (err)
 495                 goto out;
 496         f2fs_unlock_op(sbi);
 497         alloc_nid_done(sbi, inode->i_ino);
 498
 499         if (f2fs_encrypted_inode(inode)) {
 500                 struct qstr istr = QSTR_INIT(symname, len);
 501                 struct fscrypt_str ostr;
 502
 503                 sd = kzalloc(disk_link.len, GFP_NOFS);
 504                 if (!sd) {
 505                         err = -ENOMEM;
 506                         goto err_out;
 507                 }
 508
 509                 err = fscrypt_get_encryption_info(inode);
 510                 if (err)
 511                         goto err_out;
 512
 513                 if (!fscrypt_has_encryption_key(inode)) {
 514                         err = -ENOKEY;
 515                         goto err_out;
 516                 }
 517
 518                 ostr.name = sd->encrypted_path;
 519                 ostr.len = disk_link.len;
 520                 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
 521                 if (err)
 522                         goto err_out;
 523
 524                 sd->len = cpu_to_le16(ostr.len);
 525                 disk_link.name = (char *)sd;
 526         }
 527
 528         err = page_symlink(inode, disk_link.name, disk_link.len);
 529
 530 err_out:
 531         d_instantiate_new(dentry, inode);
 532
 533         /*
 534          * Let's flush symlink data in order to avoid broken symlink as much as
 535          * possible. Nevertheless, fsyncing is the best way, but there is no
 536          * way to get a file descriptor in order to flush that.
 537          *
 538          * Note that, it needs to do dir->fsync to make this recoverable.
 539          * If the symlink path is stored into inline_data, there is no
 540          * performance regression.
 541          */
 542         if (!err) {
 543                 filemap_write_and_wait_range(inode->i_mapping, 0,
 544                                                         disk_link.len - 1);
 545
 546                 if (IS_DIRSYNC(dir))
 547                         f2fs_sync_fs(sbi->sb, 1);
 548         } else {
 549                 f2fs_unlink(dir, dentry);
 550         }
 551
 552         kfree(sd);
 553
 554         f2fs_balance_fs(sbi, true);
 555         return err;
 556 out:
 557         handle_failed_inode(inode);
 558         return err;
 559 }
 560
 561 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 562 {
 563         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 564         struct inode *inode;
 565         int err;
 566
 567         err = dquot_initialize(dir);
 568         if (err)
 569                 return err;
 570
 571         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 572         if (IS_ERR(inode))
 573                 return PTR_ERR(inode);
 574
 575         inode->i_op = &f2fs_dir_inode_operations;
 576         inode->i_fop = &f2fs_dir_operations;
 577         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 578         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 579
 580         set_inode_flag(inode, FI_INC_LINK);
 581         f2fs_lock_op(sbi);
 582         err = f2fs_add_link(dentry, inode);
 583         if (err)
 584                 goto out_fail;
 585         f2fs_unlock_op(sbi);
 586
 587         alloc_nid_done(sbi, inode->i_ino);
 588
 589         d_instantiate_new(dentry, inode);
 590
 591         if (IS_DIRSYNC(dir))
 592                 f2fs_sync_fs(sbi->sb, 1);
 593
 594         f2fs_balance_fs(sbi, true);
 595         return 0;
 596
 597 out_fail:
 598         clear_inode_flag(inode, FI_INC_LINK);
 599         handle_failed_inode(inode);
 600         return err;
 601 }
 602
 603 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 604 {
 605         struct inode *inode = d_inode(dentry);
 606         if (f2fs_empty_dir(inode))
 607                 return f2fs_unlink(dir, dentry);
 608         return -ENOTEMPTY;
 609 }
 610
 611 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 612                                 umode_t mode, dev_t rdev)
 613 {
 614         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 615         struct inode *inode;
 616         int err = 0;
 617
 618         err = dquot_initialize(dir);
 619         if (err)
 620                 return err;
 621
 622         inode = f2fs_new_inode(dir, mode);
 623         if (IS_ERR(inode))
 624                 return PTR_ERR(inode);
 625
 626         init_special_inode(inode, inode->i_mode, rdev);
 627         inode->i_op = &f2fs_special_inode_operations;
 628
 629         f2fs_lock_op(sbi);
 630         err = f2fs_add_link(dentry, inode);
 631         if (err)
 632                 goto out;
 633         f2fs_unlock_op(sbi);
 634
 635         alloc_nid_done(sbi, inode->i_ino);
 636
 637         d_instantiate_new(dentry, inode);
 638
 639         if (IS_DIRSYNC(dir))
 640                 f2fs_sync_fs(sbi->sb, 1);
 641
 642         f2fs_balance_fs(sbi, true);
 643         return 0;
 644 out:
 645         handle_failed_inode(inode);
 646         return err;
 647 }
 648
 649 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 650                                         umode_t mode, struct inode **whiteout)
 651 {
 652         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 653         struct inode *inode;
 654         int err;
 655
 656         err = dquot_initialize(dir);
 657         if (err)
 658                 return err;
 659
 660         inode = f2fs_new_inode(dir, mode);
 661         if (IS_ERR(inode))
 662                 return PTR_ERR(inode);
 663
 664         if (whiteout) {
 665                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 666                 inode->i_op = &f2fs_special_inode_operations;
 667         } else {
 668                 inode->i_op = &f2fs_file_inode_operations;
 669                 inode->i_fop = &f2fs_file_operations;
 670                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 671         }
 672
 673         f2fs_lock_op(sbi);
 674         err = acquire_orphan_inode(sbi);
 675         if (err)
 676                 goto out;
 677
 678         err = f2fs_do_tmpfile(inode, dir);
 679         if (err)
 680                 goto release_out;
 681
 682         /*
 683          * add this non-linked tmpfile to orphan list, in this way we could
 684          * remove all unused data of tmpfile after abnormal power-off.
 685          */
 686         add_orphan_inode(inode);
 687         alloc_nid_done(sbi, inode->i_ino);
 688
 689         if (whiteout) {
 690                 f2fs_i_links_write(inode, false);
 691                 *whiteout = inode;
 692         } else {
 693                 d_tmpfile(dentry, inode);
 694         }
 695         /* link_count was changed by d_tmpfile as well. */
 696         f2fs_unlock_op(sbi);
 697         unlock_new_inode(inode);
 698
 699         f2fs_balance_fs(sbi, true);
 700         return 0;
 701
 702 release_out:
 703         release_orphan_inode(sbi);
 704 out:
 705         handle_failed_inode(inode);
 706         return err;
 707 }
 708
 709 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 710 {
 711         if (f2fs_encrypted_inode(dir)) {
 712                 int err = fscrypt_get_encryption_info(dir);
 713                 if (err)
 714                         return err;
 715         }
 716
 717         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 718 }
 719
 720 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 721 {
 722         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 723 }
 724
 725 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 726                         struct inode *new_dir, struct dentry *new_dentry,
 727                         unsigned int flags)
 728 {
 729         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 730         struct inode *old_inode = d_inode(old_dentry);
 731         struct inode *new_inode = d_inode(new_dentry);
 732         struct inode *whiteout = NULL;
 733         struct page *old_dir_page;
 734         struct page *old_page, *new_page = NULL;
 735         struct f2fs_dir_entry *old_dir_entry = NULL;
 736         struct f2fs_dir_entry *old_entry;
 737         struct f2fs_dir_entry *new_entry;
 738         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 739         int err = -ENOENT;
 740
 741         if ((f2fs_encrypted_inode(old_dir) &&
 742                         !fscrypt_has_encryption_key(old_dir)) ||
 743                         (f2fs_encrypted_inode(new_dir) &&
 744                         !fscrypt_has_encryption_key(new_dir)))
 745                 return -ENOKEY;
 746
 747         if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
 748                         !fscrypt_has_permitted_context(new_dir, old_inode)) {
 749                 err = -EXDEV;
 750                 goto out;
 751         }
 752
 753         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 754                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 755                         F2FS_I(old_dentry->d_inode)->i_projid)))
 756                 return -EXDEV;
 757
 758         err = dquot_initialize(old_dir);
 759         if (err)
 760                 goto out;
 761
 762         err = dquot_initialize(new_dir);
 763         if (err)
 764                 goto out;
 765
 766         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 767         if (!old_entry) {
 768                 if (IS_ERR(old_page))
 769                         err = PTR_ERR(old_page);
 770                 goto out;
 771         }
 772
 773         if (S_ISDIR(old_inode->i_mode)) {
 774                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 775                 if (!old_dir_entry) {
 776                         if (IS_ERR(old_dir_page))
 777                                 err = PTR_ERR(old_dir_page);
 778                         goto out_old;
 779                 }
 780         }
 781
 782         if (flags & RENAME_WHITEOUT) {
 783                 err = f2fs_create_whiteout(old_dir, &whiteout);
 784                 if (err)
 785                         goto out_dir;
 786         }
 787
 788         if (new_inode) {
 789
 790                 err = -ENOTEMPTY;
 791                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 792                         goto out_whiteout;
 793
 794                 err = -ENOENT;
 795                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 796                                                 &new_page);
 797                 if (!new_entry) {
 798                         if (IS_ERR(new_page))
 799                                 err = PTR_ERR(new_page);
 800                         goto out_whiteout;
 801                 }
 802
 803                 f2fs_balance_fs(sbi, true);
 804
 805                 f2fs_lock_op(sbi);
 806
 807                 err = acquire_orphan_inode(sbi);
 808                 if (err)
 809                         goto put_out_dir;
 810
 811                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 812
 813                 new_inode->i_ctime = current_time(new_inode);
 814                 down_write(&F2FS_I(new_inode)->i_sem);
 815                 if (old_dir_entry)
 816                         f2fs_i_links_write(new_inode, false);
 817                 f2fs_i_links_write(new_inode, false);
 818                 up_write(&F2FS_I(new_inode)->i_sem);
 819
 820                 if (!new_inode->i_nlink)
 821                         add_orphan_inode(new_inode);
 822                 else
 823                         release_orphan_inode(sbi);
 824         } else {
 825                 f2fs_balance_fs(sbi, true);
 826
 827                 f2fs_lock_op(sbi);
 828
 829                 err = f2fs_add_link(new_dentry, old_inode);
 830                 if (err) {
 831                         f2fs_unlock_op(sbi);
 832                         goto out_whiteout;
 833                 }
 834
 835                 if (old_dir_entry)
 836                         f2fs_i_links_write(new_dir, true);
 837
 838                 /*
 839                  * old entry and new entry can locate in the same inline
 840                  * dentry in inode, when attaching new entry in inline dentry,
 841                  * it could force inline dentry conversion, after that,
 842                  * old_entry and old_page will point to wrong address, in
 843                  * order to avoid this, let's do the check and update here.
 844                  */
 845                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 846                         f2fs_put_page(old_page, 0);
 847                         old_page = NULL;
 848
 849                         old_entry = f2fs_find_entry(old_dir,
 850                                                 &old_dentry->d_name, &old_page);
 851                         if (!old_entry) {
 852                                 err = -ENOENT;
 853                                 if (IS_ERR(old_page))
 854                                         err = PTR_ERR(old_page);
 855                                 f2fs_unlock_op(sbi);
 856                                 goto out_whiteout;
 857                         }
 858                 }
 859         }
 860
 861         down_write(&F2FS_I(old_inode)->i_sem);
 862         if (!old_dir_entry || whiteout)
 863                 file_lost_pino(old_inode);
 864         else
 865                 /* adjust dir's i_pino to pass fsck check */
 866                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
 867         up_write(&F2FS_I(old_inode)->i_sem);
 868
 869         old_inode->i_ctime = current_time(old_inode);
 870         f2fs_mark_inode_dirty_sync(old_inode, false);
 871
 872         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 873
 874         if (whiteout) {
 875                 whiteout->i_state |= I_LINKABLE;
 876                 set_inode_flag(whiteout, FI_INC_LINK);
 877                 err = f2fs_add_link(old_dentry, whiteout);
 878                 if (err)
 879                         goto put_out_dir;
 880                 whiteout->i_state &= ~I_LINKABLE;
 881                 iput(whiteout);
 882         }
 883
 884         if (old_dir_entry) {
 885                 if (old_dir != new_dir && !whiteout) {
 886                         f2fs_set_link(old_inode, old_dir_entry,
 887                                                 old_dir_page, new_dir);
 888                 } else {
 889                         f2fs_dentry_kunmap(old_inode, old_dir_page);
 890                         f2fs_put_page(old_dir_page, 0);
 891                 }
 892                 f2fs_i_links_write(old_dir, false);
 893         }
 894
 895         f2fs_unlock_op(sbi);
 896
 897         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 898                 f2fs_sync_fs(sbi->sb, 1);
 899         return 0;
 900
 901 put_out_dir:
 902         f2fs_unlock_op(sbi);
 903         if (new_page) {
 904                 f2fs_dentry_kunmap(new_dir, new_page);
 905                 f2fs_put_page(new_page, 0);
 906         }
 907 out_whiteout:
 908         if (whiteout)
 909                 iput(whiteout);
 910 out_dir:
 911         if (old_dir_entry) {
 912                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 913                 f2fs_put_page(old_dir_page, 0);
 914         }
 915 out_old:
 916         f2fs_dentry_kunmap(old_dir, old_page);
 917         f2fs_put_page(old_page, 0);
 918 out:
 919         return err;
 920 }
 921
 922 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 923                              struct inode *new_dir, struct dentry *new_dentry)
 924 {
 925         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 926         struct inode *old_inode = d_inode(old_dentry);
 927         struct inode *new_inode = d_inode(new_dentry);
 928         struct page *old_dir_page, *new_dir_page;
 929         struct page *old_page, *new_page;
 930         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
 931         struct f2fs_dir_entry *old_entry, *new_entry;
 932         int old_nlink = 0, new_nlink = 0;
 933         int err = -ENOENT;
 934
 935         if ((f2fs_encrypted_inode(old_dir) &&
 936                         !fscrypt_has_encryption_key(old_dir)) ||
 937                         (f2fs_encrypted_inode(new_dir) &&
 938                         !fscrypt_has_encryption_key(new_dir)))
 939                 return -ENOKEY;
 940
 941         if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
 942                         (old_dir != new_dir) &&
 943                         (!fscrypt_has_permitted_context(new_dir, old_inode) ||
 944                          !fscrypt_has_permitted_context(old_dir, new_inode)))
 945                 return -EXDEV;
 946
 947         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 948                         !projid_eq(F2FS_I(new_dir)->i_projid,
 949                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
 950             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 951                         !projid_eq(F2FS_I(old_dir)->i_projid,
 952                         F2FS_I(new_dentry->d_inode)->i_projid)))
 953                 return -EXDEV;
 954
 955         err = dquot_initialize(old_dir);
 956         if (err)
 957                 goto out;
 958
 959         err = dquot_initialize(new_dir);
 960         if (err)
 961                 goto out;
 962
 963         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 964         if (!old_entry) {
 965                 if (IS_ERR(old_page))
 966                         err = PTR_ERR(old_page);
 967                 goto out;
 968         }
 969
 970         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
 971         if (!new_entry) {
 972                 if (IS_ERR(new_page))
 973                         err = PTR_ERR(new_page);
 974                 goto out_old;
 975         }
 976
 977         /* prepare for updating ".." directory entry info later */
 978         if (old_dir != new_dir) {
 979                 if (S_ISDIR(old_inode->i_mode)) {
 980                         old_dir_entry = f2fs_parent_dir(old_inode,
 981                                                         &old_dir_page);
 982                         if (!old_dir_entry) {
 983                                 if (IS_ERR(old_dir_page))
 984                                         err = PTR_ERR(old_dir_page);
 985                                 goto out_new;
 986                         }
 987                 }
 988
 989                 if (S_ISDIR(new_inode->i_mode)) {
 990                         new_dir_entry = f2fs_parent_dir(new_inode,
 991                                                         &new_dir_page);
 992                         if (!new_dir_entry) {
 993                                 if (IS_ERR(new_dir_page))
 994                                         err = PTR_ERR(new_dir_page);
 995                                 goto out_old_dir;
 996                         }
 997                 }
 998         }
 999
1000         /*
1001          * If cross rename between file and directory those are not
1002          * in the same directory, we will inc nlink of file's parent
1003          * later, so we should check upper boundary of its nlink.
1004          */
1005         if ((!old_dir_entry || !new_dir_entry) &&
1006                                 old_dir_entry != new_dir_entry) {
1007                 old_nlink = old_dir_entry ? -1 : 1;
1008                 new_nlink = -old_nlink;
1009                 err = -EMLINK;
1010                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1011                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1012                         goto out_new_dir;
1013         }
1014
1015         f2fs_balance_fs(sbi, true);
1016
1017         f2fs_lock_op(sbi);
1018
1019         /* update ".." directory entry info of old dentry */
1020         if (old_dir_entry)
1021                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1022
1023         /* update ".." directory entry info of new dentry */
1024         if (new_dir_entry)
1025                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1026
1027         /* update directory entry info of old dir inode */
1028         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1029
1030         down_write(&F2FS_I(old_inode)->i_sem);
1031         if (!old_dir_entry)
1032                 file_lost_pino(old_inode);
1033         else
1034                 /* adjust dir's i_pino to pass fsck check */
1035                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1036         up_write(&F2FS_I(old_inode)->i_sem);
1037
1038         old_dir->i_ctime = current_time(old_dir);
1039         if (old_nlink) {
1040                 down_write(&F2FS_I(old_dir)->i_sem);
1041                 f2fs_i_links_write(old_dir, old_nlink > 0);
1042                 up_write(&F2FS_I(old_dir)->i_sem);
1043         }
1044         f2fs_mark_inode_dirty_sync(old_dir, false);
1045
1046         /* update directory entry info of new dir inode */
1047         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1048
1049         down_write(&F2FS_I(new_inode)->i_sem);
1050         if (!new_dir_entry)
1051                 file_lost_pino(new_inode);
1052         else
1053                 /* adjust dir's i_pino to pass fsck check */
1054                 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1055         up_write(&F2FS_I(new_inode)->i_sem);
1056
1057         new_dir->i_ctime = current_time(new_dir);
1058         if (new_nlink) {
1059                 down_write(&F2FS_I(new_dir)->i_sem);
1060                 f2fs_i_links_write(new_dir, new_nlink > 0);
1061                 up_write(&F2FS_I(new_dir)->i_sem);
1062         }
1063         f2fs_mark_inode_dirty_sync(new_dir, false);
1064
1065         f2fs_unlock_op(sbi);
1066
1067         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1068                 f2fs_sync_fs(sbi->sb, 1);
1069         return 0;
1070 out_new_dir:
1071         if (new_dir_entry) {
1072                 f2fs_dentry_kunmap(new_inode, new_dir_page);
1073                 f2fs_put_page(new_dir_page, 0);
1074         }
1075 out_old_dir:
1076         if (old_dir_entry) {
1077                 f2fs_dentry_kunmap(old_inode, old_dir_page);
1078                 f2fs_put_page(old_dir_page, 0);
1079         }
1080 out_new:
1081         f2fs_dentry_kunmap(new_dir, new_page);
1082         f2fs_put_page(new_page, 0);
1083 out_old:
1084         f2fs_dentry_kunmap(old_dir, old_page);
1085         f2fs_put_page(old_page, 0);
1086 out:
1087         return err;
1088 }
1089
1090 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1091                         struct inode *new_dir, struct dentry *new_dentry,
1092                         unsigned int flags)
1093 {
1094         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1095                 return -EINVAL;
1096
1097         if (flags & RENAME_EXCHANGE) {
1098                 return f2fs_cross_rename(old_dir, old_dentry,
1099                                          new_dir, new_dentry);
1100         }
1101         /*
1102          * VFS has already handled the new dentry existence case,
1103          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1104          */
1105         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1106 }
1107
1108 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1109                                            struct inode *inode,
1110                                            struct delayed_call *done)
1111 {
1112         struct page *cpage = NULL;
1113         char *caddr, *paddr = NULL;
1114         struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1115         struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1116         struct fscrypt_symlink_data *sd;
1117         u32 max_size = inode->i_sb->s_blocksize;
1118         int res;
1119
1120         if (!dentry)
1121                 return ERR_PTR(-ECHILD);
1122
1123         res = fscrypt_get_encryption_info(inode);
1124         if (res)
1125                 return ERR_PTR(res);
1126
1127         cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1128         if (IS_ERR(cpage))
1129                 return ERR_CAST(cpage);
1130         caddr = page_address(cpage);
1131
1132         /* Symlink is encrypted */
1133         sd = (struct fscrypt_symlink_data *)caddr;
1134         cstr.name = sd->encrypted_path;
1135         cstr.len = le16_to_cpu(sd->len);
1136
1137         /* this is broken symlink case */
1138         if (unlikely(cstr.len == 0)) {
1139                 res = -ENOENT;
1140                 goto errout;
1141         }
1142
1143         if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1144                 /* Symlink data on the disk is corrupted */
1145                 res = -EIO;
1146                 goto errout;
1147         }
1148         res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1149         if (res)
1150                 goto errout;
1151
1152         res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1153         if (res)
1154                 goto errout;
1155
1156         /* this is broken symlink case */
1157         if (unlikely(pstr.name[0] == 0)) {
1158                 res = -ENOENT;
1159                 goto errout;
1160         }
1161
1162         paddr = pstr.name;
1163
1164         /* Null-terminate the name */
1165         paddr[pstr.len] = '\0';
1166
1167         put_page(cpage);
1168         set_delayed_call(done, kfree_link, paddr);
1169         return paddr;
1170 errout:
1171         fscrypt_fname_free_buffer(&pstr);
1172         put_page(cpage);
1173         return ERR_PTR(res);
1174 }
1175
1176 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1177         .get_link       = f2fs_encrypted_get_link,
1178         .getattr        = f2fs_getattr,
1179         .setattr        = f2fs_setattr,
1180 #ifdef CONFIG_F2FS_FS_XATTR
1181         .listxattr      = f2fs_listxattr,
1182 #endif
1183 };
1184
1185 const struct inode_operations f2fs_dir_inode_operations = {
1186         .create         = f2fs_create,
1187         .lookup         = f2fs_lookup,
1188         .link           = f2fs_link,
1189         .unlink         = f2fs_unlink,
1190         .symlink        = f2fs_symlink,
1191         .mkdir          = f2fs_mkdir,
1192         .rmdir          = f2fs_rmdir,
1193         .mknod          = f2fs_mknod,
1194         .rename         = f2fs_rename2,
1195         .tmpfile        = f2fs_tmpfile,
1196         .getattr        = f2fs_getattr,
1197         .setattr        = f2fs_setattr,
1198         .get_acl        = f2fs_get_acl,
1199         .set_acl        = f2fs_set_acl,
1200 #ifdef CONFIG_F2FS_FS_XATTR
1201         .listxattr      = f2fs_listxattr,
1202 #endif
1203 };
1204
1205 const struct inode_operations f2fs_symlink_inode_operations = {
1206         .get_link       = f2fs_get_link,
1207         .getattr        = f2fs_getattr,
1208         .setattr        = f2fs_setattr,
1209 #ifdef CONFIG_F2FS_FS_XATTR
1210         .listxattr      = f2fs_listxattr,
1211 #endif
1212 };
1213
1214 const struct inode_operations f2fs_special_inode_operations = {
1215         .getattr        = f2fs_getattr,
1216         .setattr        = f2fs_setattr,
1217         .get_acl        = f2fs_get_acl,
1218         .set_acl        = f2fs_set_acl,
1219 #ifdef CONFIG_F2FS_FS_XATTR
1220         .listxattr      = f2fs_listxattr,
1221 #endif
1222 };