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_follow_link(struct dentry *dentry, void **cookie)
 440 {
 441         const char *link = page_follow_link_light(dentry, cookie);
 442         if (!IS_ERR(link) && !*link) {
 443                 /* this is broken symlink case */
 444                 page_put_link(NULL, *cookie);
 445                 link = ERR_PTR(-ENOENT);
 446         }
 447         return link;
 448 }
 449
 450 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 451                                         const char *symname)
 452 {
 453         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 454         struct inode *inode;
 455         size_t len = strlen(symname);
 456         struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
 457         struct fscrypt_symlink_data *sd = NULL;
 458         int err;
 459
 460         if (f2fs_encrypted_inode(dir)) {
 461                 err = fscrypt_get_encryption_info(dir);
 462                 if (err)
 463                         return err;
 464
 465                 if (!fscrypt_has_encryption_key(dir))
 466                         return -ENOKEY;
 467
 468                 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
 469                                 sizeof(struct fscrypt_symlink_data));
 470         }
 471
 472         if (disk_link.len > dir->i_sb->s_blocksize)
 473                 return -ENAMETOOLONG;
 474
 475         err = dquot_initialize(dir);
 476         if (err)
 477                 return err;
 478
 479         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 480         if (IS_ERR(inode))
 481                 return PTR_ERR(inode);
 482
 483         if (f2fs_encrypted_inode(inode))
 484                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 485         else
 486                 inode->i_op = &f2fs_symlink_inode_operations;
 487         inode_nohighmem(inode);
 488         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 489
 490         f2fs_lock_op(sbi);
 491         err = f2fs_add_link(dentry, inode);
 492         if (err)
 493                 goto out;
 494         f2fs_unlock_op(sbi);
 495         alloc_nid_done(sbi, inode->i_ino);
 496
 497         if (f2fs_encrypted_inode(inode)) {
 498                 struct qstr istr = QSTR_INIT(symname, len);
 499                 struct fscrypt_str ostr;
 500
 501                 sd = kzalloc(disk_link.len, GFP_NOFS);
 502                 if (!sd) {
 503                         err = -ENOMEM;
 504                         goto err_out;
 505                 }
 506
 507                 err = fscrypt_get_encryption_info(inode);
 508                 if (err)
 509                         goto err_out;
 510
 511                 if (!fscrypt_has_encryption_key(inode)) {
 512                         err = -ENOKEY;
 513                         goto err_out;
 514                 }
 515
 516                 ostr.name = sd->encrypted_path;
 517                 ostr.len = disk_link.len;
 518                 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
 519                 if (err)
 520                         goto err_out;
 521
 522                 sd->len = cpu_to_le16(ostr.len);
 523                 disk_link.name = (char *)sd;
 524         }
 525
 526         err = page_symlink(inode, disk_link.name, disk_link.len);
 527
 528 err_out:
 529         d_instantiate(dentry, inode);
 530         unlock_new_inode(inode);
 531
 532         /*
 533          * Let's flush symlink data in order to avoid broken symlink as much as
 534          * possible. Nevertheless, fsyncing is the best way, but there is no
 535          * way to get a file descriptor in order to flush that.
 536          *
 537          * Note that, it needs to do dir->fsync to make this recoverable.
 538          * If the symlink path is stored into inline_data, there is no
 539          * performance regression.
 540          */
 541         if (!err) {
 542                 filemap_write_and_wait_range(inode->i_mapping, 0,
 543                                                         disk_link.len - 1);
 544
 545                 if (IS_DIRSYNC(dir))
 546                         f2fs_sync_fs(sbi->sb, 1);
 547         } else {
 548                 f2fs_unlink(dir, dentry);
 549         }
 550
 551         kfree(sd);
 552
 553         f2fs_balance_fs(sbi, true);
 554         return err;
 555 out:
 556         handle_failed_inode(inode);
 557         return err;
 558 }
 559
 560 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 561 {
 562         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 563         struct inode *inode;
 564         int err;
 565
 566         err = dquot_initialize(dir);
 567         if (err)
 568                 return err;
 569
 570         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 571         if (IS_ERR(inode))
 572                 return PTR_ERR(inode);
 573
 574         inode->i_op = &f2fs_dir_inode_operations;
 575         inode->i_fop = &f2fs_dir_operations;
 576         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 577         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 578
 579         set_inode_flag(inode, FI_INC_LINK);
 580         f2fs_lock_op(sbi);
 581         err = f2fs_add_link(dentry, inode);
 582         if (err)
 583                 goto out_fail;
 584         f2fs_unlock_op(sbi);
 585
 586         alloc_nid_done(sbi, inode->i_ino);
 587
 588         d_instantiate(dentry, inode);
 589         unlock_new_inode(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(dentry, inode);
 638         unlock_new_inode(inode);
 639
 640         if (IS_DIRSYNC(dir))
 641                 f2fs_sync_fs(sbi->sb, 1);
 642
 643         f2fs_balance_fs(sbi, true);
 644         return 0;
 645 out:
 646         handle_failed_inode(inode);
 647         return err;
 648 }
 649
 650 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 651                                         umode_t mode, struct inode **whiteout)
 652 {
 653         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 654         struct inode *inode;
 655         int err;
 656
 657         err = dquot_initialize(dir);
 658         if (err)
 659                 return err;
 660
 661         inode = f2fs_new_inode(dir, mode);
 662         if (IS_ERR(inode))
 663                 return PTR_ERR(inode);
 664
 665         if (whiteout) {
 666                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 667                 inode->i_op = &f2fs_special_inode_operations;
 668         } else {
 669                 inode->i_op = &f2fs_file_inode_operations;
 670                 inode->i_fop = &f2fs_file_operations;
 671                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 672         }
 673
 674         f2fs_lock_op(sbi);
 675         err = acquire_orphan_inode(sbi);
 676         if (err)
 677                 goto out;
 678
 679         err = f2fs_do_tmpfile(inode, dir);
 680         if (err)
 681                 goto release_out;
 682
 683         /*
 684          * add this non-linked tmpfile to orphan list, in this way we could
 685          * remove all unused data of tmpfile after abnormal power-off.
 686          */
 687         add_orphan_inode(inode);
 688         alloc_nid_done(sbi, inode->i_ino);
 689
 690         if (whiteout) {
 691                 f2fs_i_links_write(inode, false);
 692                 *whiteout = inode;
 693         } else {
 694                 d_tmpfile(dentry, inode);
 695         }
 696         /* link_count was changed by d_tmpfile as well. */
 697         f2fs_unlock_op(sbi);
 698         unlock_new_inode(inode);
 699
 700         f2fs_balance_fs(sbi, true);
 701         return 0;
 702
 703 release_out:
 704         release_orphan_inode(sbi);
 705 out:
 706         handle_failed_inode(inode);
 707         return err;
 708 }
 709
 710 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 711 {
 712         if (f2fs_encrypted_inode(dir)) {
 713                 int err = fscrypt_get_encryption_info(dir);
 714                 if (err)
 715                         return err;
 716         }
 717
 718         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 719 }
 720
 721 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 722 {
 723         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 724 }
 725
 726 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 727                         struct inode *new_dir, struct dentry *new_dentry,
 728                         unsigned int flags)
 729 {
 730         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 731         struct inode *old_inode = d_inode(old_dentry);
 732         struct inode *new_inode = d_inode(new_dentry);
 733         struct inode *whiteout = NULL;
 734         struct page *old_dir_page;
 735         struct page *old_page, *new_page = NULL;
 736         struct f2fs_dir_entry *old_dir_entry = NULL;
 737         struct f2fs_dir_entry *old_entry;
 738         struct f2fs_dir_entry *new_entry;
 739         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 740         int err = -ENOENT;
 741
 742         if ((f2fs_encrypted_inode(old_dir) &&
 743                         !fscrypt_has_encryption_key(old_dir)) ||
 744                         (f2fs_encrypted_inode(new_dir) &&
 745                         !fscrypt_has_encryption_key(new_dir)))
 746                 return -ENOKEY;
 747
 748         if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
 749                         !fscrypt_has_permitted_context(new_dir, old_inode)) {
 750                 err = -EPERM;
 751                 goto out;
 752         }
 753
 754         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 755                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 756                         F2FS_I(old_dentry->d_inode)->i_projid)))
 757                 return -EXDEV;
 758
 759         err = dquot_initialize(old_dir);
 760         if (err)
 761                 goto out;
 762
 763         err = dquot_initialize(new_dir);
 764         if (err)
 765                 goto out;
 766
 767         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 768         if (!old_entry) {
 769                 if (IS_ERR(old_page))
 770                         err = PTR_ERR(old_page);
 771                 goto out;
 772         }
 773
 774         if (S_ISDIR(old_inode->i_mode)) {
 775                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 776                 if (!old_dir_entry) {
 777                         if (IS_ERR(old_dir_page))
 778                                 err = PTR_ERR(old_dir_page);
 779                         goto out_old;
 780                 }
 781         }
 782
 783         if (flags & RENAME_WHITEOUT) {
 784                 err = f2fs_create_whiteout(old_dir, &whiteout);
 785                 if (err)
 786                         goto out_dir;
 787         }
 788
 789         if (new_inode) {
 790
 791                 err = -ENOTEMPTY;
 792                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 793                         goto out_whiteout;
 794
 795                 err = -ENOENT;
 796                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 797                                                 &new_page);
 798                 if (!new_entry) {
 799                         if (IS_ERR(new_page))
 800                                 err = PTR_ERR(new_page);
 801                         goto out_whiteout;
 802                 }
 803
 804                 f2fs_balance_fs(sbi, true);
 805
 806                 f2fs_lock_op(sbi);
 807
 808                 err = acquire_orphan_inode(sbi);
 809                 if (err)
 810                         goto put_out_dir;
 811
 812                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 813
 814                 new_inode->i_ctime = current_time(new_inode);
 815                 down_write(&F2FS_I(new_inode)->i_sem);
 816                 if (old_dir_entry)
 817                         f2fs_i_links_write(new_inode, false);
 818                 f2fs_i_links_write(new_inode, false);
 819                 up_write(&F2FS_I(new_inode)->i_sem);
 820
 821                 if (!new_inode->i_nlink)
 822                         add_orphan_inode(new_inode);
 823                 else
 824                         release_orphan_inode(sbi);
 825         } else {
 826                 f2fs_balance_fs(sbi, true);
 827
 828                 f2fs_lock_op(sbi);
 829
 830                 err = f2fs_add_link(new_dentry, old_inode);
 831                 if (err) {
 832                         f2fs_unlock_op(sbi);
 833                         goto out_whiteout;
 834                 }
 835
 836                 if (old_dir_entry)
 837                         f2fs_i_links_write(new_dir, true);
 838
 839                 /*
 840                  * old entry and new entry can locate in the same inline
 841                  * dentry in inode, when attaching new entry in inline dentry,
 842                  * it could force inline dentry conversion, after that,
 843                  * old_entry and old_page will point to wrong address, in
 844                  * order to avoid this, let's do the check and update here.
 845                  */
 846                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 847                         f2fs_put_page(old_page, 0);
 848                         old_page = NULL;
 849
 850                         old_entry = f2fs_find_entry(old_dir,
 851                                                 &old_dentry->d_name, &old_page);
 852                         if (!old_entry) {
 853                                 err = -ENOENT;
 854                                 if (IS_ERR(old_page))
 855                                         err = PTR_ERR(old_page);
 856                                 f2fs_unlock_op(sbi);
 857                                 goto out_whiteout;
 858                         }
 859                 }
 860         }
 861
 862         down_write(&F2FS_I(old_inode)->i_sem);
 863         if (!old_dir_entry || whiteout)
 864                 file_lost_pino(old_inode);
 865         else
 866                 F2FS_I(old_inode)->i_pino = 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 -EPERM;
 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         file_lost_pino(old_inode);
1032         up_write(&F2FS_I(old_inode)->i_sem);
1033
1034         old_dir->i_ctime = current_time(old_dir);
1035         if (old_nlink) {
1036                 down_write(&F2FS_I(old_dir)->i_sem);
1037                 f2fs_i_links_write(old_dir, old_nlink > 0);
1038                 up_write(&F2FS_I(old_dir)->i_sem);
1039         }
1040         f2fs_mark_inode_dirty_sync(old_dir, false);
1041
1042         /* update directory entry info of new dir inode */
1043         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1044
1045         down_write(&F2FS_I(new_inode)->i_sem);
1046         file_lost_pino(new_inode);
1047         up_write(&F2FS_I(new_inode)->i_sem);
1048
1049         new_dir->i_ctime = current_time(new_dir);
1050         if (new_nlink) {
1051                 down_write(&F2FS_I(new_dir)->i_sem);
1052                 f2fs_i_links_write(new_dir, new_nlink > 0);
1053                 up_write(&F2FS_I(new_dir)->i_sem);
1054         }
1055         f2fs_mark_inode_dirty_sync(new_dir, false);
1056
1057         f2fs_unlock_op(sbi);
1058
1059         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1060                 f2fs_sync_fs(sbi->sb, 1);
1061         return 0;
1062 out_new_dir:
1063         if (new_dir_entry) {
1064                 f2fs_dentry_kunmap(new_inode, new_dir_page);
1065                 f2fs_put_page(new_dir_page, 0);
1066         }
1067 out_old_dir:
1068         if (old_dir_entry) {
1069                 f2fs_dentry_kunmap(old_inode, old_dir_page);
1070                 f2fs_put_page(old_dir_page, 0);
1071         }
1072 out_new:
1073         f2fs_dentry_kunmap(new_dir, new_page);
1074         f2fs_put_page(new_page, 0);
1075 out_old:
1076         f2fs_dentry_kunmap(old_dir, old_page);
1077         f2fs_put_page(old_page, 0);
1078 out:
1079         return err;
1080 }
1081
1082 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1083                         struct inode *new_dir, struct dentry *new_dentry,
1084                         unsigned int flags)
1085 {
1086         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1087                 return -EINVAL;
1088
1089         if (flags & RENAME_EXCHANGE) {
1090                 return f2fs_cross_rename(old_dir, old_dentry,
1091                                          new_dir, new_dentry);
1092         }
1093         /*
1094          * VFS has already handled the new dentry existence case,
1095          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1096          */
1097         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1098 }
1099
1100 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1101 {
1102         struct page *cpage = NULL;
1103         char *caddr, *paddr = NULL;
1104         struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1105         struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1106         struct fscrypt_symlink_data *sd;
1107         struct inode *inode = d_inode(dentry);
1108         u32 max_size = inode->i_sb->s_blocksize;
1109         int res;
1110
1111         res = fscrypt_get_encryption_info(inode);
1112         if (res)
1113                 return ERR_PTR(res);
1114
1115         cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1116         if (IS_ERR(cpage))
1117                 return ERR_CAST(cpage);
1118         caddr = page_address(cpage);
1119
1120         /* Symlink is encrypted */
1121         sd = (struct fscrypt_symlink_data *)caddr;
1122         cstr.name = sd->encrypted_path;
1123         cstr.len = le16_to_cpu(sd->len);
1124
1125         /* this is broken symlink case */
1126         if (unlikely(cstr.len == 0)) {
1127                 res = -ENOENT;
1128                 goto errout;
1129         }
1130
1131         if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1132                 /* Symlink data on the disk is corrupted */
1133                 res = -EIO;
1134                 goto errout;
1135         }
1136         res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1137         if (res)
1138                 goto errout;
1139
1140         res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1141         if (res)
1142                 goto errout;
1143
1144         /* this is broken symlink case */
1145         if (unlikely(pstr.name[0] == 0)) {
1146                 res = -ENOENT;
1147                 goto errout;
1148         }
1149
1150         paddr = pstr.name;
1151
1152         /* Null-terminate the name */
1153         paddr[pstr.len] = '\0';
1154
1155         put_page(cpage);
1156         return *cookie = paddr;
1157 errout:
1158         fscrypt_fname_free_buffer(&pstr);
1159         put_page(cpage);
1160         return ERR_PTR(res);
1161 }
1162
1163 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1164         .readlink       = generic_readlink,
1165         .follow_link    = f2fs_encrypted_follow_link,
1166         .put_link       = kfree_put_link,
1167         .getattr        = f2fs_getattr,
1168         .setattr        = f2fs_setattr,
1169 #ifdef CONFIG_F2FS_FS_XATTR
1170         .setxattr       = generic_setxattr,
1171         .getxattr       = generic_getxattr,
1172         .listxattr      = f2fs_listxattr,
1173         .removexattr    = generic_removexattr,
1174 #endif
1175 };
1176
1177 const struct inode_operations f2fs_dir_inode_operations = {
1178         .create         = f2fs_create,
1179         .lookup         = f2fs_lookup,
1180         .link           = f2fs_link,
1181         .unlink         = f2fs_unlink,
1182         .symlink        = f2fs_symlink,
1183         .mkdir          = f2fs_mkdir,
1184         .rmdir          = f2fs_rmdir,
1185         .mknod          = f2fs_mknod,
1186         .rename2        = f2fs_rename2,
1187         .tmpfile        = f2fs_tmpfile,
1188         .getattr        = f2fs_getattr,
1189         .setattr        = f2fs_setattr,
1190         .get_acl        = f2fs_get_acl,
1191         .set_acl        = f2fs_set_acl,
1192 #ifdef CONFIG_F2FS_FS_XATTR
1193         .setxattr       = generic_setxattr,
1194         .getxattr       = generic_getxattr,
1195         .listxattr      = f2fs_listxattr,
1196         .removexattr    = generic_removexattr,
1197 #endif
1198 };
1199
1200 const struct inode_operations f2fs_symlink_inode_operations = {
1201         .readlink       = generic_readlink,
1202         .follow_link    = f2fs_follow_link,
1203         .put_link       = page_put_link,
1204         .getattr        = f2fs_getattr,
1205         .setattr        = f2fs_setattr,
1206 #ifdef CONFIG_F2FS_FS_XATTR
1207         .setxattr       = generic_setxattr,
1208         .getxattr       = generic_getxattr,
1209         .listxattr      = f2fs_listxattr,
1210         .removexattr    = generic_removexattr,
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         .setxattr       = generic_setxattr,
1221         .getxattr       = generic_getxattr,
1222         .listxattr      = f2fs_listxattr,
1223         .removexattr    = generic_removexattr,
1224 #endif
1225 };