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 xattr_size = 0;
  33         int err;
  34
  35         inode = new_inode(dir->i_sb);
  36         if (!inode)
  37                 return ERR_PTR(-ENOMEM);
  38
  39         f2fs_lock_op(sbi);
  40         if (!f2fs_alloc_nid(sbi, &ino)) {
  41                 f2fs_unlock_op(sbi);
  42                 err = -ENOSPC;
  43                 goto fail;
  44         }
  45         f2fs_unlock_op(sbi);
  46
  47         nid_free = true;
  48
  49         inode_init_owner(inode, dir, mode);
  50
  51         inode->i_ino = ino;
  52         inode->i_blocks = 0;
  53         inode->i_mtime = inode->i_atime = inode->i_ctime =
  54                         F2FS_I(inode)->i_crtime = current_time(inode);
  55         inode->i_generation = sbi->s_next_generation++;
  56
  57         if (S_ISDIR(inode->i_mode))
  58                 F2FS_I(inode)->i_current_depth = 1;
  59
  60         err = insert_inode_locked(inode);
  61         if (err) {
  62                 err = -EINVAL;
  63                 goto fail;
  64         }
  65
  66         if (f2fs_sb_has_project_quota(sbi->sb) &&
  67                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
  68                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  69         else
  70                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  71                                                         F2FS_DEF_PROJID);
  72
  73         err = dquot_initialize(inode);
  74         if (err)
  75                 goto fail_drop;
  76
  77         err = dquot_alloc_inode(inode);
  78         if (err)
  79                 goto fail_drop;
  80
  81         set_inode_flag(inode, FI_NEW_INODE);
  82
  83         /* If the directory encrypted, then we should encrypt the inode. */
  84         if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
  85                                 f2fs_may_encrypt(inode))
  86                 f2fs_set_encrypted_inode(inode);
  87
  88         if (f2fs_sb_has_extra_attr(sbi->sb)) {
  89                 set_inode_flag(inode, FI_EXTRA_ATTR);
  90                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  91         }
  92
  93         if (test_opt(sbi, INLINE_XATTR))
  94                 set_inode_flag(inode, FI_INLINE_XATTR);
  95
  96         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  97                 set_inode_flag(inode, FI_INLINE_DATA);
  98         if (f2fs_may_inline_dentry(inode))
  99                 set_inode_flag(inode, FI_INLINE_DENTRY);
 100
 101         if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
 102                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
 103                 if (f2fs_has_inline_xattr(inode))
 104                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
 105                 /* Otherwise, will be 0 */
 106         } else if (f2fs_has_inline_xattr(inode) ||
 107                                 f2fs_has_inline_dentry(inode)) {
 108                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 109         }
 110         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 111
 112         f2fs_init_extent_tree(inode, NULL);
 113
 114         stat_inc_inline_xattr(inode);
 115         stat_inc_inline_inode(inode);
 116         stat_inc_inline_dir(inode);
 117
 118         F2FS_I(inode)->i_flags =
 119                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 120
 121         if (S_ISDIR(inode->i_mode))
 122                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
 123
 124         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
 125                 set_inode_flag(inode, FI_PROJ_INHERIT);
 126
 127         trace_f2fs_new_inode(inode, 0);
 128         return inode;
 129
 130 fail:
 131         trace_f2fs_new_inode(inode, err);
 132         make_bad_inode(inode);
 133         if (nid_free)
 134                 set_inode_flag(inode, FI_FREE_NID);
 135         iput(inode);
 136         return ERR_PTR(err);
 137 fail_drop:
 138         trace_f2fs_new_inode(inode, err);
 139         dquot_drop(inode);
 140         inode->i_flags |= S_NOQUOTA;
 141         if (nid_free)
 142                 set_inode_flag(inode, FI_FREE_NID);
 143         clear_nlink(inode);
 144         unlock_new_inode(inode);
 145         iput(inode);
 146         return ERR_PTR(err);
 147 }
 148
 149 static int is_extension_exist(const unsigned char *s, const char *sub)
 150 {
 151         size_t slen = strlen(s);
 152         size_t sublen = strlen(sub);
 153         int i;
 154
 155         /*
 156          * filename format of multimedia file should be defined as:
 157          * "filename + '.' + extension + (optional: '.' + temp extension)".
 158          */
 159         if (slen < sublen + 2)
 160                 return 0;
 161
 162         for (i = 1; i < slen - sublen; i++) {
 163                 if (s[i] != '.')
 164                         continue;
 165                 if (!strncasecmp(s + i + 1, sub, sublen))
 166                         return 1;
 167         }
 168
 169         return 0;
 170 }
 171
 172 /*
 173  * Set multimedia files as cold files for hot/cold data separation
 174  */
 175 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 176                 const unsigned char *name)
 177 {
 178         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 179         int i, cold_count, hot_count;
 180
 181         down_read(&sbi->sb_lock);
 182
 183         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 184         hot_count = sbi->raw_super->hot_ext_count;
 185
 186         for (i = 0; i < cold_count + hot_count; i++) {
 187                 if (!is_extension_exist(name, extlist[i]))
 188                         continue;
 189                 if (i < cold_count)
 190                         file_set_cold(inode);
 191                 else
 192                         file_set_hot(inode);
 193                 break;
 194         }
 195
 196         up_read(&sbi->sb_lock);
 197 }
 198
 199 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 200                                                         bool hot, bool set)
 201 {
 202         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 203         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 204         int hot_count = sbi->raw_super->hot_ext_count;
 205         int total_count = cold_count + hot_count;
 206         int start, count;
 207         int i;
 208
 209         if (set) {
 210                 if (total_count == F2FS_MAX_EXTENSION)
 211                         return -EINVAL;
 212         } else {
 213                 if (!hot && !cold_count)
 214                         return -EINVAL;
 215                 if (hot && !hot_count)
 216                         return -EINVAL;
 217         }
 218
 219         if (hot) {
 220                 start = cold_count;
 221                 count = total_count;
 222         } else {
 223                 start = 0;
 224                 count = cold_count;
 225         }
 226
 227         for (i = start; i < count; i++) {
 228                 if (strcmp(name, extlist[i]))
 229                         continue;
 230
 231                 if (set)
 232                         return -EINVAL;
 233
 234                 memcpy(extlist[i], extlist[i + 1],
 235                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 236                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 237                 if (hot)
 238                         sbi->raw_super->hot_ext_count = hot_count - 1;
 239                 else
 240                         sbi->raw_super->extension_count =
 241                                                 cpu_to_le32(cold_count - 1);
 242                 return 0;
 243         }
 244
 245         if (!set)
 246                 return -EINVAL;
 247
 248         if (hot) {
 249                 strncpy(extlist[count], name, strlen(name));
 250                 sbi->raw_super->hot_ext_count = hot_count + 1;
 251         } else {
 252                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 253
 254                 memcpy(buf, &extlist[cold_count],
 255                                 F2FS_EXTENSION_LEN * hot_count);
 256                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 257                 strncpy(extlist[cold_count], name, strlen(name));
 258                 memcpy(&extlist[cold_count + 1], buf,
 259                                 F2FS_EXTENSION_LEN * hot_count);
 260                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 261         }
 262         return 0;
 263 }
 264
 265 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 266                                                 bool excl)
 267 {
 268         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 269         struct inode *inode;
 270         nid_t ino = 0;
 271         int err;
 272
 273         if (unlikely(f2fs_cp_error(sbi)))
 274                 return -EIO;
 275
 276         err = dquot_initialize(dir);
 277         if (err)
 278                 return err;
 279
 280         inode = f2fs_new_inode(dir, mode);
 281         if (IS_ERR(inode))
 282                 return PTR_ERR(inode);
 283
 284         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 285                 set_file_temperature(sbi, inode, dentry->d_name.name);
 286
 287         inode->i_op = &f2fs_file_inode_operations;
 288         inode->i_fop = &f2fs_file_operations;
 289         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 290         ino = inode->i_ino;
 291
 292         f2fs_lock_op(sbi);
 293         err = f2fs_add_link(dentry, inode);
 294         if (err)
 295                 goto out;
 296         f2fs_unlock_op(sbi);
 297
 298         f2fs_alloc_nid_done(sbi, ino);
 299
 300         d_instantiate_new(dentry, inode);
 301
 302         if (IS_DIRSYNC(dir))
 303                 f2fs_sync_fs(sbi->sb, 1);
 304
 305         f2fs_balance_fs(sbi, true);
 306         return 0;
 307 out:
 308         f2fs_handle_failed_inode(inode);
 309         return err;
 310 }
 311
 312 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 313                 struct dentry *dentry)
 314 {
 315         struct inode *inode = d_inode(old_dentry);
 316         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 317         int err;
 318
 319         if (unlikely(f2fs_cp_error(sbi)))
 320                 return -EIO;
 321
 322         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 323         if (err)
 324                 return err;
 325
 326         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 327                         (!projid_eq(F2FS_I(dir)->i_projid,
 328                         F2FS_I(old_dentry->d_inode)->i_projid)))
 329                 return -EXDEV;
 330
 331         err = dquot_initialize(dir);
 332         if (err)
 333                 return err;
 334
 335         f2fs_balance_fs(sbi, true);
 336
 337         inode->i_ctime = current_time(inode);
 338         ihold(inode);
 339
 340         set_inode_flag(inode, FI_INC_LINK);
 341         f2fs_lock_op(sbi);
 342         err = f2fs_add_link(dentry, inode);
 343         if (err)
 344                 goto out;
 345         f2fs_unlock_op(sbi);
 346
 347         d_instantiate(dentry, inode);
 348
 349         if (IS_DIRSYNC(dir))
 350                 f2fs_sync_fs(sbi->sb, 1);
 351         return 0;
 352 out:
 353         clear_inode_flag(inode, FI_INC_LINK);
 354         iput(inode);
 355         f2fs_unlock_op(sbi);
 356         return err;
 357 }
 358
 359 struct dentry *f2fs_get_parent(struct dentry *child)
 360 {
 361         struct qstr dotdot = QSTR_INIT("..", 2);
 362         struct page *page;
 363         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 364         if (!ino) {
 365                 if (IS_ERR(page))
 366                         return ERR_CAST(page);
 367                 return ERR_PTR(-ENOENT);
 368         }
 369         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 370 }
 371
 372 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 373 {
 374         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 375         struct qstr dot = QSTR_INIT(".", 1);
 376         struct qstr dotdot = QSTR_INIT("..", 2);
 377         struct f2fs_dir_entry *de;
 378         struct page *page;
 379         int err = 0;
 380
 381         if (f2fs_readonly(sbi->sb)) {
 382                 f2fs_msg(sbi->sb, KERN_INFO,
 383                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 384                         "in readonly mountpoint", dir->i_ino, pino);
 385                 return 0;
 386         }
 387
 388         err = dquot_initialize(dir);
 389         if (err)
 390                 return err;
 391
 392         f2fs_balance_fs(sbi, true);
 393
 394         f2fs_lock_op(sbi);
 395
 396         de = f2fs_find_entry(dir, &dot, &page);
 397         if (de) {
 398                 f2fs_put_page(page, 0);
 399         } else if (IS_ERR(page)) {
 400                 err = PTR_ERR(page);
 401                 goto out;
 402         } else {
 403                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 404                 if (err)
 405                         goto out;
 406         }
 407
 408         de = f2fs_find_entry(dir, &dotdot, &page);
 409         if (de)
 410                 f2fs_put_page(page, 0);
 411         else if (IS_ERR(page))
 412                 err = PTR_ERR(page);
 413         else
 414                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 415 out:
 416         if (!err)
 417                 clear_inode_flag(dir, FI_INLINE_DOTS);
 418
 419         f2fs_unlock_op(sbi);
 420         return err;
 421 }
 422
 423 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 424                 unsigned int flags)
 425 {
 426         struct inode *inode = NULL;
 427         struct f2fs_dir_entry *de;
 428         struct page *page;
 429         struct dentry *new;
 430         nid_t ino = -1;
 431         int err = 0;
 432         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 433
 434         trace_f2fs_lookup_start(dir, dentry, flags);
 435
 436         err = fscrypt_prepare_lookup(dir, dentry, flags);
 437         if (err)
 438                 goto out;
 439
 440         if (dentry->d_name.len > F2FS_NAME_LEN) {
 441                 err = -ENAMETOOLONG;
 442                 goto out;
 443         }
 444
 445         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 446         if (!de) {
 447                 if (IS_ERR(page)) {
 448                         err = PTR_ERR(page);
 449                         goto out;
 450                 }
 451                 goto out_splice;
 452         }
 453
 454         ino = le32_to_cpu(de->ino);
 455         f2fs_put_page(page, 0);
 456
 457         inode = f2fs_iget(dir->i_sb, ino);
 458         if (IS_ERR(inode)) {
 459                 err = PTR_ERR(inode);
 460                 goto out;
 461         }
 462
 463         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 464                 err = __recover_dot_dentries(dir, root_ino);
 465                 if (err)
 466                         goto out_iput;
 467         }
 468
 469         if (f2fs_has_inline_dots(inode)) {
 470                 err = __recover_dot_dentries(inode, dir->i_ino);
 471                 if (err)
 472                         goto out_iput;
 473         }
 474         if (f2fs_encrypted_inode(dir) &&
 475             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 476             !fscrypt_has_permitted_context(dir, inode)) {
 477                 f2fs_msg(inode->i_sb, KERN_WARNING,
 478                          "Inconsistent encryption contexts: %lu/%lu",
 479                          dir->i_ino, inode->i_ino);
 480                 err = -EPERM;
 481                 goto out_iput;
 482         }
 483 out_splice:
 484         new = d_splice_alias(inode, dentry);
 485         if (IS_ERR(new))
 486                 err = PTR_ERR(new);
 487         trace_f2fs_lookup_end(dir, dentry, ino, err);
 488         return new;
 489 out_iput:
 490         iput(inode);
 491 out:
 492         trace_f2fs_lookup_end(dir, dentry, ino, err);
 493         return ERR_PTR(err);
 494 }
 495
 496 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 497 {
 498         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 499         struct inode *inode = d_inode(dentry);
 500         struct f2fs_dir_entry *de;
 501         struct page *page;
 502         int err = -ENOENT;
 503
 504         trace_f2fs_unlink_enter(dir, dentry);
 505
 506         if (unlikely(f2fs_cp_error(sbi)))
 507                 return -EIO;
 508
 509         err = dquot_initialize(dir);
 510         if (err)
 511                 return err;
 512         err = dquot_initialize(inode);
 513         if (err)
 514                 return err;
 515
 516         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 517         if (!de) {
 518                 if (IS_ERR(page))
 519                         err = PTR_ERR(page);
 520                 goto fail;
 521         }
 522
 523         f2fs_balance_fs(sbi, true);
 524
 525         f2fs_lock_op(sbi);
 526         err = f2fs_acquire_orphan_inode(sbi);
 527         if (err) {
 528                 f2fs_unlock_op(sbi);
 529                 f2fs_put_page(page, 0);
 530                 goto fail;
 531         }
 532         f2fs_delete_entry(de, page, dir, inode);
 533         f2fs_unlock_op(sbi);
 534
 535         if (IS_DIRSYNC(dir))
 536                 f2fs_sync_fs(sbi->sb, 1);
 537 fail:
 538         trace_f2fs_unlink_exit(inode, err);
 539         return err;
 540 }
 541
 542 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
 543 {
 544         const char *link = page_follow_link_light(dentry, cookie);
 545         if (!IS_ERR(link) && !*link) {
 546                 /* this is broken symlink case */
 547                 page_put_link(NULL, *cookie);
 548                 link = ERR_PTR(-ENOENT);
 549         }
 550         return link;
 551 }
 552
 553 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 554                                         const char *symname)
 555 {
 556         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 557         struct inode *inode;
 558         size_t len = strlen(symname);
 559         struct fscrypt_str disk_link;
 560         int err;
 561
 562         if (unlikely(f2fs_cp_error(sbi)))
 563                 return -EIO;
 564
 565         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 566                                       &disk_link);
 567         if (err)
 568                 return err;
 569
 570         err = dquot_initialize(dir);
 571         if (err)
 572                 return err;
 573
 574         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 575         if (IS_ERR(inode))
 576                 return PTR_ERR(inode);
 577
 578         if (IS_ENCRYPTED(inode))
 579                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 580         else
 581                 inode->i_op = &f2fs_symlink_inode_operations;
 582         inode_nohighmem(inode);
 583         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 584
 585         f2fs_lock_op(sbi);
 586         err = f2fs_add_link(dentry, inode);
 587         if (err)
 588                 goto out_f2fs_handle_failed_inode;
 589         f2fs_unlock_op(sbi);
 590         f2fs_alloc_nid_done(sbi, inode->i_ino);
 591
 592         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 593         if (err)
 594                 goto err_out;
 595
 596         err = page_symlink(inode, disk_link.name, disk_link.len);
 597
 598 err_out:
 599         d_instantiate_new(dentry, inode);
 600
 601         /*
 602          * Let's flush symlink data in order to avoid broken symlink as much as
 603          * possible. Nevertheless, fsyncing is the best way, but there is no
 604          * way to get a file descriptor in order to flush that.
 605          *
 606          * Note that, it needs to do dir->fsync to make this recoverable.
 607          * If the symlink path is stored into inline_data, there is no
 608          * performance regression.
 609          */
 610         if (!err) {
 611                 filemap_write_and_wait_range(inode->i_mapping, 0,
 612                                                         disk_link.len - 1);
 613
 614                 if (IS_DIRSYNC(dir))
 615                         f2fs_sync_fs(sbi->sb, 1);
 616         } else {
 617                 f2fs_unlink(dir, dentry);
 618         }
 619
 620         f2fs_balance_fs(sbi, true);
 621         goto out_free_encrypted_link;
 622
 623 out_f2fs_handle_failed_inode:
 624         f2fs_handle_failed_inode(inode);
 625 out_free_encrypted_link:
 626         if (disk_link.name != (unsigned char *)symname)
 627                 kfree(disk_link.name);
 628         return err;
 629 }
 630
 631 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 632 {
 633         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 634         struct inode *inode;
 635         int err;
 636
 637         if (unlikely(f2fs_cp_error(sbi)))
 638                 return -EIO;
 639
 640         err = dquot_initialize(dir);
 641         if (err)
 642                 return err;
 643
 644         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 645         if (IS_ERR(inode))
 646                 return PTR_ERR(inode);
 647
 648         inode->i_op = &f2fs_dir_inode_operations;
 649         inode->i_fop = &f2fs_dir_operations;
 650         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 651         inode_nohighmem(inode);
 652
 653         set_inode_flag(inode, FI_INC_LINK);
 654         f2fs_lock_op(sbi);
 655         err = f2fs_add_link(dentry, inode);
 656         if (err)
 657                 goto out_fail;
 658         f2fs_unlock_op(sbi);
 659
 660         f2fs_alloc_nid_done(sbi, inode->i_ino);
 661
 662         d_instantiate_new(dentry, inode);
 663
 664         if (IS_DIRSYNC(dir))
 665                 f2fs_sync_fs(sbi->sb, 1);
 666
 667         f2fs_balance_fs(sbi, true);
 668         return 0;
 669
 670 out_fail:
 671         clear_inode_flag(inode, FI_INC_LINK);
 672         f2fs_handle_failed_inode(inode);
 673         return err;
 674 }
 675
 676 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 677 {
 678         struct inode *inode = d_inode(dentry);
 679         if (f2fs_empty_dir(inode))
 680                 return f2fs_unlink(dir, dentry);
 681         return -ENOTEMPTY;
 682 }
 683
 684 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 685                                 umode_t mode, dev_t rdev)
 686 {
 687         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 688         struct inode *inode;
 689         int err = 0;
 690
 691         if (unlikely(f2fs_cp_error(sbi)))
 692                 return -EIO;
 693
 694         err = dquot_initialize(dir);
 695         if (err)
 696                 return err;
 697
 698         inode = f2fs_new_inode(dir, mode);
 699         if (IS_ERR(inode))
 700                 return PTR_ERR(inode);
 701
 702         init_special_inode(inode, inode->i_mode, rdev);
 703         inode->i_op = &f2fs_special_inode_operations;
 704
 705         f2fs_lock_op(sbi);
 706         err = f2fs_add_link(dentry, inode);
 707         if (err)
 708                 goto out;
 709         f2fs_unlock_op(sbi);
 710
 711         f2fs_alloc_nid_done(sbi, inode->i_ino);
 712
 713         d_instantiate_new(dentry, inode);
 714
 715         if (IS_DIRSYNC(dir))
 716                 f2fs_sync_fs(sbi->sb, 1);
 717
 718         f2fs_balance_fs(sbi, true);
 719         return 0;
 720 out:
 721         f2fs_handle_failed_inode(inode);
 722         return err;
 723 }
 724
 725 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 726                                         umode_t mode, struct inode **whiteout)
 727 {
 728         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 729         struct inode *inode;
 730         int err;
 731
 732         err = dquot_initialize(dir);
 733         if (err)
 734                 return err;
 735
 736         inode = f2fs_new_inode(dir, mode);
 737         if (IS_ERR(inode))
 738                 return PTR_ERR(inode);
 739
 740         if (whiteout) {
 741                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 742                 inode->i_op = &f2fs_special_inode_operations;
 743         } else {
 744                 inode->i_op = &f2fs_file_inode_operations;
 745                 inode->i_fop = &f2fs_file_operations;
 746                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 747         }
 748
 749         f2fs_lock_op(sbi);
 750         err = f2fs_acquire_orphan_inode(sbi);
 751         if (err)
 752                 goto out;
 753
 754         err = f2fs_do_tmpfile(inode, dir);
 755         if (err)
 756                 goto release_out;
 757
 758         /*
 759          * add this non-linked tmpfile to orphan list, in this way we could
 760          * remove all unused data of tmpfile after abnormal power-off.
 761          */
 762         f2fs_add_orphan_inode(inode);
 763         f2fs_alloc_nid_done(sbi, inode->i_ino);
 764
 765         if (whiteout) {
 766                 f2fs_i_links_write(inode, false);
 767                 *whiteout = inode;
 768         } else {
 769                 d_tmpfile(dentry, inode);
 770         }
 771         /* link_count was changed by d_tmpfile as well. */
 772         f2fs_unlock_op(sbi);
 773         unlock_new_inode(inode);
 774
 775         f2fs_balance_fs(sbi, true);
 776         return 0;
 777
 778 release_out:
 779         f2fs_release_orphan_inode(sbi);
 780 out:
 781         f2fs_handle_failed_inode(inode);
 782         return err;
 783 }
 784
 785 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 786 {
 787         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 788
 789         if (unlikely(f2fs_cp_error(sbi)))
 790                 return -EIO;
 791
 792         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 793                 int err = fscrypt_get_encryption_info(dir);
 794                 if (err)
 795                         return err;
 796         }
 797
 798         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 799 }
 800
 801 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 802 {
 803         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 804                 return -EIO;
 805
 806         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 807 }
 808
 809 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 810                         struct inode *new_dir, struct dentry *new_dentry,
 811                         unsigned int flags)
 812 {
 813         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 814         struct inode *old_inode = d_inode(old_dentry);
 815         struct inode *new_inode = d_inode(new_dentry);
 816         struct inode *whiteout = NULL;
 817         struct page *old_dir_page;
 818         struct page *old_page, *new_page = NULL;
 819         struct f2fs_dir_entry *old_dir_entry = NULL;
 820         struct f2fs_dir_entry *old_entry;
 821         struct f2fs_dir_entry *new_entry;
 822         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 823         int err = -ENOENT;
 824
 825         if (unlikely(f2fs_cp_error(sbi)))
 826                 return -EIO;
 827
 828         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 829                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 830                         F2FS_I(old_dentry->d_inode)->i_projid)))
 831                 return -EXDEV;
 832
 833         err = dquot_initialize(old_dir);
 834         if (err)
 835                 goto out;
 836
 837         err = dquot_initialize(new_dir);
 838         if (err)
 839                 goto out;
 840
 841         if (new_inode) {
 842                 err = dquot_initialize(new_inode);
 843                 if (err)
 844                         goto out;
 845         }
 846
 847         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 848         if (!old_entry) {
 849                 if (IS_ERR(old_page))
 850                         err = PTR_ERR(old_page);
 851                 goto out;
 852         }
 853
 854         if (S_ISDIR(old_inode->i_mode)) {
 855                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 856                 if (!old_dir_entry) {
 857                         if (IS_ERR(old_dir_page))
 858                                 err = PTR_ERR(old_dir_page);
 859                         goto out_old;
 860                 }
 861         }
 862
 863         if (flags & RENAME_WHITEOUT) {
 864                 err = f2fs_create_whiteout(old_dir, &whiteout);
 865                 if (err)
 866                         goto out_dir;
 867         }
 868
 869         if (new_inode) {
 870
 871                 err = -ENOTEMPTY;
 872                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 873                         goto out_whiteout;
 874
 875                 err = -ENOENT;
 876                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 877                                                 &new_page);
 878                 if (!new_entry) {
 879                         if (IS_ERR(new_page))
 880                                 err = PTR_ERR(new_page);
 881                         goto out_whiteout;
 882                 }
 883
 884                 f2fs_balance_fs(sbi, true);
 885
 886                 f2fs_lock_op(sbi);
 887
 888                 err = f2fs_acquire_orphan_inode(sbi);
 889                 if (err)
 890                         goto put_out_dir;
 891
 892                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 893
 894                 new_inode->i_ctime = current_time(new_inode);
 895                 down_write(&F2FS_I(new_inode)->i_sem);
 896                 if (old_dir_entry)
 897                         f2fs_i_links_write(new_inode, false);
 898                 f2fs_i_links_write(new_inode, false);
 899                 up_write(&F2FS_I(new_inode)->i_sem);
 900
 901                 if (!new_inode->i_nlink)
 902                         f2fs_add_orphan_inode(new_inode);
 903                 else
 904                         f2fs_release_orphan_inode(sbi);
 905         } else {
 906                 f2fs_balance_fs(sbi, true);
 907
 908                 f2fs_lock_op(sbi);
 909
 910                 err = f2fs_add_link(new_dentry, old_inode);
 911                 if (err) {
 912                         f2fs_unlock_op(sbi);
 913                         goto out_whiteout;
 914                 }
 915
 916                 if (old_dir_entry)
 917                         f2fs_i_links_write(new_dir, true);
 918
 919                 /*
 920                  * old entry and new entry can locate in the same inline
 921                  * dentry in inode, when attaching new entry in inline dentry,
 922                  * it could force inline dentry conversion, after that,
 923                  * old_entry and old_page will point to wrong address, in
 924                  * order to avoid this, let's do the check and update here.
 925                  */
 926                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 927                         f2fs_put_page(old_page, 0);
 928                         old_page = NULL;
 929
 930                         old_entry = f2fs_find_entry(old_dir,
 931                                                 &old_dentry->d_name, &old_page);
 932                         if (!old_entry) {
 933                                 err = -ENOENT;
 934                                 if (IS_ERR(old_page))
 935                                         err = PTR_ERR(old_page);
 936                                 f2fs_unlock_op(sbi);
 937                                 goto out_whiteout;
 938                         }
 939                 }
 940         }
 941
 942         down_write(&F2FS_I(old_inode)->i_sem);
 943         if (!old_dir_entry || whiteout)
 944                 file_lost_pino(old_inode);
 945         else
 946                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 947         up_write(&F2FS_I(old_inode)->i_sem);
 948
 949         old_inode->i_ctime = current_time(old_inode);
 950         f2fs_mark_inode_dirty_sync(old_inode, false);
 951
 952         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 953
 954         if (whiteout) {
 955                 whiteout->i_state |= I_LINKABLE;
 956                 set_inode_flag(whiteout, FI_INC_LINK);
 957                 err = f2fs_add_link(old_dentry, whiteout);
 958                 if (err)
 959                         goto put_out_dir;
 960                 whiteout->i_state &= ~I_LINKABLE;
 961                 iput(whiteout);
 962         }
 963
 964         if (old_dir_entry) {
 965                 if (old_dir != new_dir && !whiteout)
 966                         f2fs_set_link(old_inode, old_dir_entry,
 967                                                 old_dir_page, new_dir);
 968                 else
 969                         f2fs_put_page(old_dir_page, 0);
 970                 f2fs_i_links_write(old_dir, false);
 971         }
 972         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 973                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 974                 if (S_ISDIR(old_inode->i_mode))
 975                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
 976                                                         TRANS_DIR_INO);
 977         }
 978
 979         f2fs_unlock_op(sbi);
 980
 981         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 982                 f2fs_sync_fs(sbi->sb, 1);
 983         return 0;
 984
 985 put_out_dir:
 986         f2fs_unlock_op(sbi);
 987         if (new_page)
 988                 f2fs_put_page(new_page, 0);
 989 out_whiteout:
 990         if (whiteout)
 991                 iput(whiteout);
 992 out_dir:
 993         if (old_dir_entry)
 994                 f2fs_put_page(old_dir_page, 0);
 995 out_old:
 996         f2fs_put_page(old_page, 0);
 997 out:
 998         return err;
 999 }
1000
1001 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1002                              struct inode *new_dir, struct dentry *new_dentry)
1003 {
1004         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1005         struct inode *old_inode = d_inode(old_dentry);
1006         struct inode *new_inode = d_inode(new_dentry);
1007         struct page *old_dir_page, *new_dir_page;
1008         struct page *old_page, *new_page;
1009         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1010         struct f2fs_dir_entry *old_entry, *new_entry;
1011         int old_nlink = 0, new_nlink = 0;
1012         int err = -ENOENT;
1013
1014         if (unlikely(f2fs_cp_error(sbi)))
1015                 return -EIO;
1016
1017         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1018                         !projid_eq(F2FS_I(new_dir)->i_projid,
1019                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1020             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1021                         !projid_eq(F2FS_I(old_dir)->i_projid,
1022                         F2FS_I(new_dentry->d_inode)->i_projid)))
1023                 return -EXDEV;
1024
1025         err = dquot_initialize(old_dir);
1026         if (err)
1027                 goto out;
1028
1029         err = dquot_initialize(new_dir);
1030         if (err)
1031                 goto out;
1032
1033         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1034         if (!old_entry) {
1035                 if (IS_ERR(old_page))
1036                         err = PTR_ERR(old_page);
1037                 goto out;
1038         }
1039
1040         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1041         if (!new_entry) {
1042                 if (IS_ERR(new_page))
1043                         err = PTR_ERR(new_page);
1044                 goto out_old;
1045         }
1046
1047         /* prepare for updating ".." directory entry info later */
1048         if (old_dir != new_dir) {
1049                 if (S_ISDIR(old_inode->i_mode)) {
1050                         old_dir_entry = f2fs_parent_dir(old_inode,
1051                                                         &old_dir_page);
1052                         if (!old_dir_entry) {
1053                                 if (IS_ERR(old_dir_page))
1054                                         err = PTR_ERR(old_dir_page);
1055                                 goto out_new;
1056                         }
1057                 }
1058
1059                 if (S_ISDIR(new_inode->i_mode)) {
1060                         new_dir_entry = f2fs_parent_dir(new_inode,
1061                                                         &new_dir_page);
1062                         if (!new_dir_entry) {
1063                                 if (IS_ERR(new_dir_page))
1064                                         err = PTR_ERR(new_dir_page);
1065                                 goto out_old_dir;
1066                         }
1067                 }
1068         }
1069
1070         /*
1071          * If cross rename between file and directory those are not
1072          * in the same directory, we will inc nlink of file's parent
1073          * later, so we should check upper boundary of its nlink.
1074          */
1075         if ((!old_dir_entry || !new_dir_entry) &&
1076                                 old_dir_entry != new_dir_entry) {
1077                 old_nlink = old_dir_entry ? -1 : 1;
1078                 new_nlink = -old_nlink;
1079                 err = -EMLINK;
1080                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1081                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1082                         goto out_new_dir;
1083         }
1084
1085         f2fs_balance_fs(sbi, true);
1086
1087         f2fs_lock_op(sbi);
1088
1089         /* update ".." directory entry info of old dentry */
1090         if (old_dir_entry)
1091                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1092
1093         /* update ".." directory entry info of new dentry */
1094         if (new_dir_entry)
1095                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1096
1097         /* update directory entry info of old dir inode */
1098         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1099
1100         down_write(&F2FS_I(old_inode)->i_sem);
1101         file_lost_pino(old_inode);
1102         up_write(&F2FS_I(old_inode)->i_sem);
1103
1104         old_dir->i_ctime = current_time(old_dir);
1105         if (old_nlink) {
1106                 down_write(&F2FS_I(old_dir)->i_sem);
1107                 f2fs_i_links_write(old_dir, old_nlink > 0);
1108                 up_write(&F2FS_I(old_dir)->i_sem);
1109         }
1110         f2fs_mark_inode_dirty_sync(old_dir, false);
1111
1112         /* update directory entry info of new dir inode */
1113         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1114
1115         down_write(&F2FS_I(new_inode)->i_sem);
1116         file_lost_pino(new_inode);
1117         up_write(&F2FS_I(new_inode)->i_sem);
1118
1119         new_dir->i_ctime = current_time(new_dir);
1120         if (new_nlink) {
1121                 down_write(&F2FS_I(new_dir)->i_sem);
1122                 f2fs_i_links_write(new_dir, new_nlink > 0);
1123                 up_write(&F2FS_I(new_dir)->i_sem);
1124         }
1125         f2fs_mark_inode_dirty_sync(new_dir, false);
1126
1127         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1128                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1129                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1130         }
1131
1132         f2fs_unlock_op(sbi);
1133
1134         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1135                 f2fs_sync_fs(sbi->sb, 1);
1136         return 0;
1137 out_new_dir:
1138         if (new_dir_entry) {
1139                 f2fs_put_page(new_dir_page, 0);
1140         }
1141 out_old_dir:
1142         if (old_dir_entry) {
1143                 f2fs_put_page(old_dir_page, 0);
1144         }
1145 out_new:
1146         f2fs_put_page(new_page, 0);
1147 out_old:
1148         f2fs_put_page(old_page, 0);
1149 out:
1150         return err;
1151 }
1152
1153 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1154                         struct inode *new_dir, struct dentry *new_dentry,
1155                         unsigned int flags)
1156 {
1157         int err;
1158
1159         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1160                 return -EINVAL;
1161
1162         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1163                                      flags);
1164         if (err)
1165                 return err;
1166
1167         if (flags & RENAME_EXCHANGE) {
1168                 return f2fs_cross_rename(old_dir, old_dentry,
1169                                          new_dir, new_dentry);
1170         }
1171         /*
1172          * VFS has already handled the new dentry existence case,
1173          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1174          */
1175         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1176 }
1177
1178 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1179 {
1180         struct inode *inode = d_inode(dentry);
1181         struct page *page;
1182         void *target;
1183
1184         if (!dentry)
1185                 return ERR_PTR(-ECHILD);
1186
1187         page = read_mapping_page(inode->i_mapping, 0, NULL);
1188         if (IS_ERR(page))
1189                 return ERR_CAST(page);
1190
1191         target = fscrypt_get_symlink(inode, page_address(page),
1192                                      inode->i_sb->s_blocksize);
1193         put_page(page);
1194         return *cookie = target;
1195 }
1196
1197 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1198         .readlink       = generic_readlink,
1199         .follow_link    = f2fs_encrypted_follow_link,
1200         .put_link       = kfree_put_link,
1201         .getattr        = f2fs_getattr,
1202         .setattr        = f2fs_setattr,
1203 #ifdef CONFIG_F2FS_FS_XATTR
1204         .setxattr       = generic_setxattr,
1205         .getxattr       = generic_getxattr,
1206         .listxattr      = f2fs_listxattr,
1207         .removexattr    = generic_removexattr,
1208 #endif
1209 };
1210
1211 const struct inode_operations f2fs_dir_inode_operations = {
1212         .create         = f2fs_create,
1213         .lookup         = f2fs_lookup,
1214         .link           = f2fs_link,
1215         .unlink         = f2fs_unlink,
1216         .symlink        = f2fs_symlink,
1217         .mkdir          = f2fs_mkdir,
1218         .rmdir          = f2fs_rmdir,
1219         .mknod          = f2fs_mknod,
1220         .rename2        = f2fs_rename2,
1221         .tmpfile        = f2fs_tmpfile,
1222         .getattr        = f2fs_getattr,
1223         .setattr        = f2fs_setattr,
1224         .get_acl        = f2fs_get_acl,
1225         .set_acl        = f2fs_set_acl,
1226 #ifdef CONFIG_F2FS_FS_XATTR
1227         .setxattr       = generic_setxattr,
1228         .getxattr       = generic_getxattr,
1229         .listxattr      = f2fs_listxattr,
1230         .removexattr    = generic_removexattr,
1231 #endif
1232 };
1233
1234 const struct inode_operations f2fs_symlink_inode_operations = {
1235         .readlink       = generic_readlink,
1236         .follow_link    = f2fs_follow_link,
1237         .put_link       = page_put_link,
1238         .getattr        = f2fs_getattr,
1239         .setattr        = f2fs_setattr,
1240 #ifdef CONFIG_F2FS_FS_XATTR
1241         .setxattr       = generic_setxattr,
1242         .getxattr       = generic_getxattr,
1243         .listxattr      = f2fs_listxattr,
1244         .removexattr    = generic_removexattr,
1245 #endif
1246 };
1247
1248 const struct inode_operations f2fs_special_inode_operations = {
1249         .getattr        = f2fs_getattr,
1250         .setattr        = f2fs_setattr,
1251         .get_acl        = f2fs_get_acl,
1252         .set_acl        = f2fs_set_acl,
1253 #ifdef CONFIG_F2FS_FS_XATTR
1254         .setxattr       = generic_setxattr,
1255         .getxattr       = generic_getxattr,
1256         .listxattr      = f2fs_listxattr,
1257         .removexattr    = generic_removexattr,
1258 #endif
1259 };