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