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 = current_time(inode);
  54         F2FS_I(inode)->i_crtime = inode->i_mtime;
  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         f2fs_set_inode_flags(inode);
 128
 129         trace_f2fs_new_inode(inode, 0);
 130         return inode;
 131
 132 fail:
 133         trace_f2fs_new_inode(inode, err);
 134         make_bad_inode(inode);
 135         if (nid_free)
 136                 set_inode_flag(inode, FI_FREE_NID);
 137         iput(inode);
 138         return ERR_PTR(err);
 139 fail_drop:
 140         trace_f2fs_new_inode(inode, err);
 141         dquot_drop(inode);
 142         inode->i_flags |= S_NOQUOTA;
 143         if (nid_free)
 144                 set_inode_flag(inode, FI_FREE_NID);
 145         clear_nlink(inode);
 146         unlock_new_inode(inode);
 147         iput(inode);
 148         return ERR_PTR(err);
 149 }
 150
 151 static int is_extension_exist(const unsigned char *s, const char *sub)
 152 {
 153         size_t slen = strlen(s);
 154         size_t sublen = strlen(sub);
 155         int i;
 156
 157         /*
 158          * filename format of multimedia file should be defined as:
 159          * "filename + '.' + extension + (optional: '.' + temp extension)".
 160          */
 161         if (slen < sublen + 2)
 162                 return 0;
 163
 164         for (i = 1; i < slen - sublen; i++) {
 165                 if (s[i] != '.')
 166                         continue;
 167                 if (!strncasecmp(s + i + 1, sub, sublen))
 168                         return 1;
 169         }
 170
 171         return 0;
 172 }
 173
 174 /*
 175  * Set multimedia files as cold files for hot/cold data separation
 176  */
 177 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 178                 const unsigned char *name)
 179 {
 180         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 181         int i, cold_count, hot_count;
 182
 183         down_read(&sbi->sb_lock);
 184
 185         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 186         hot_count = sbi->raw_super->hot_ext_count;
 187
 188         for (i = 0; i < cold_count + hot_count; i++) {
 189                 if (!is_extension_exist(name, extlist[i]))
 190                         continue;
 191                 if (i < cold_count)
 192                         file_set_cold(inode);
 193                 else
 194                         file_set_hot(inode);
 195                 break;
 196         }
 197
 198         up_read(&sbi->sb_lock);
 199 }
 200
 201 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 202                                                         bool hot, bool set)
 203 {
 204         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 205         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 206         int hot_count = sbi->raw_super->hot_ext_count;
 207         int total_count = cold_count + hot_count;
 208         int start, count;
 209         int i;
 210
 211         if (set) {
 212                 if (total_count == F2FS_MAX_EXTENSION)
 213                         return -EINVAL;
 214         } else {
 215                 if (!hot && !cold_count)
 216                         return -EINVAL;
 217                 if (hot && !hot_count)
 218                         return -EINVAL;
 219         }
 220
 221         if (hot) {
 222                 start = cold_count;
 223                 count = total_count;
 224         } else {
 225                 start = 0;
 226                 count = cold_count;
 227         }
 228
 229         for (i = start; i < count; i++) {
 230                 if (strcmp(name, extlist[i]))
 231                         continue;
 232
 233                 if (set)
 234                         return -EINVAL;
 235
 236                 memcpy(extlist[i], extlist[i + 1],
 237                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 238                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 239                 if (hot)
 240                         sbi->raw_super->hot_ext_count = hot_count - 1;
 241                 else
 242                         sbi->raw_super->extension_count =
 243                                                 cpu_to_le32(cold_count - 1);
 244                 return 0;
 245         }
 246
 247         if (!set)
 248                 return -EINVAL;
 249
 250         if (hot) {
 251                 memcpy(extlist[count], name, strlen(name));
 252                 sbi->raw_super->hot_ext_count = hot_count + 1;
 253         } else {
 254                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 255
 256                 memcpy(buf, &extlist[cold_count],
 257                                 F2FS_EXTENSION_LEN * hot_count);
 258                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 259                 memcpy(extlist[cold_count], name, strlen(name));
 260                 memcpy(&extlist[cold_count + 1], buf,
 261                                 F2FS_EXTENSION_LEN * hot_count);
 262                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 263         }
 264         return 0;
 265 }
 266
 267 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 268                                                 bool excl)
 269 {
 270         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 271         struct inode *inode;
 272         nid_t ino = 0;
 273         int err;
 274
 275         if (unlikely(f2fs_cp_error(sbi)))
 276                 return -EIO;
 277
 278         err = dquot_initialize(dir);
 279         if (err)
 280                 return err;
 281
 282         inode = f2fs_new_inode(dir, mode);
 283         if (IS_ERR(inode))
 284                 return PTR_ERR(inode);
 285
 286         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 287                 set_file_temperature(sbi, inode, dentry->d_name.name);
 288
 289         inode->i_op = &f2fs_file_inode_operations;
 290         inode->i_fop = &f2fs_file_operations;
 291         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 292         ino = inode->i_ino;
 293
 294         f2fs_lock_op(sbi);
 295         err = f2fs_add_link(dentry, inode);
 296         if (err)
 297                 goto out;
 298         f2fs_unlock_op(sbi);
 299
 300         f2fs_alloc_nid_done(sbi, ino);
 301
 302         d_instantiate_new(dentry, inode);
 303
 304         if (IS_DIRSYNC(dir))
 305                 f2fs_sync_fs(sbi->sb, 1);
 306
 307         f2fs_balance_fs(sbi, true);
 308         return 0;
 309 out:
 310         f2fs_handle_failed_inode(inode);
 311         return err;
 312 }
 313
 314 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 315                 struct dentry *dentry)
 316 {
 317         struct inode *inode = d_inode(old_dentry);
 318         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 319         int err;
 320
 321         if (unlikely(f2fs_cp_error(sbi)))
 322                 return -EIO;
 323
 324         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 325         if (err)
 326                 return err;
 327
 328         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 329                         (!projid_eq(F2FS_I(dir)->i_projid,
 330                         F2FS_I(old_dentry->d_inode)->i_projid)))
 331                 return -EXDEV;
 332
 333         err = dquot_initialize(dir);
 334         if (err)
 335                 return err;
 336
 337         f2fs_balance_fs(sbi, true);
 338
 339         inode->i_ctime = current_time(inode);
 340         ihold(inode);
 341
 342         set_inode_flag(inode, FI_INC_LINK);
 343         f2fs_lock_op(sbi);
 344         err = f2fs_add_link(dentry, inode);
 345         if (err)
 346                 goto out;
 347         f2fs_unlock_op(sbi);
 348
 349         d_instantiate(dentry, inode);
 350
 351         if (IS_DIRSYNC(dir))
 352                 f2fs_sync_fs(sbi->sb, 1);
 353         return 0;
 354 out:
 355         clear_inode_flag(inode, FI_INC_LINK);
 356         iput(inode);
 357         f2fs_unlock_op(sbi);
 358         return err;
 359 }
 360
 361 struct dentry *f2fs_get_parent(struct dentry *child)
 362 {
 363         struct qstr dotdot = QSTR_INIT("..", 2);
 364         struct page *page;
 365         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 366         if (!ino) {
 367                 if (IS_ERR(page))
 368                         return ERR_CAST(page);
 369                 return ERR_PTR(-ENOENT);
 370         }
 371         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 372 }
 373
 374 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 375 {
 376         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 377         struct qstr dot = QSTR_INIT(".", 1);
 378         struct qstr dotdot = QSTR_INIT("..", 2);
 379         struct f2fs_dir_entry *de;
 380         struct page *page;
 381         int err = 0;
 382
 383         if (f2fs_readonly(sbi->sb)) {
 384                 f2fs_msg(sbi->sb, KERN_INFO,
 385                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 386                         "in readonly mountpoint", dir->i_ino, pino);
 387                 return 0;
 388         }
 389
 390         err = dquot_initialize(dir);
 391         if (err)
 392                 return err;
 393
 394         f2fs_balance_fs(sbi, true);
 395
 396         f2fs_lock_op(sbi);
 397
 398         de = f2fs_find_entry(dir, &dot, &page);
 399         if (de) {
 400                 f2fs_put_page(page, 0);
 401         } else if (IS_ERR(page)) {
 402                 err = PTR_ERR(page);
 403                 goto out;
 404         } else {
 405                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 406                 if (err)
 407                         goto out;
 408         }
 409
 410         de = f2fs_find_entry(dir, &dotdot, &page);
 411         if (de)
 412                 f2fs_put_page(page, 0);
 413         else if (IS_ERR(page))
 414                 err = PTR_ERR(page);
 415         else
 416                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 417 out:
 418         if (!err)
 419                 clear_inode_flag(dir, FI_INLINE_DOTS);
 420
 421         f2fs_unlock_op(sbi);
 422         return err;
 423 }
 424
 425 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 426                 unsigned int flags)
 427 {
 428         struct inode *inode = NULL;
 429         struct f2fs_dir_entry *de;
 430         struct page *page;
 431         struct dentry *new;
 432         nid_t ino = -1;
 433         int err = 0;
 434         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 435         struct fscrypt_name fname;
 436
 437         trace_f2fs_lookup_start(dir, dentry, flags);
 438
 439         if (dentry->d_name.len > F2FS_NAME_LEN) {
 440                 err = -ENAMETOOLONG;
 441                 goto out;
 442         }
 443
 444         err = fscrypt_prepare_lookup(dir, dentry, &fname);
 445         if (err == -ENOENT)
 446                 goto out_splice;
 447         if (err)
 448                 goto out;
 449         de = __f2fs_find_entry(dir, &fname, &page);
 450         fscrypt_free_filename(&fname);
 451
 452         if (!de) {
 453                 if (IS_ERR(page)) {
 454                         err = PTR_ERR(page);
 455                         goto out;
 456                 }
 457                 goto out_splice;
 458         }
 459
 460         ino = le32_to_cpu(de->ino);
 461         f2fs_put_page(page, 0);
 462
 463         inode = f2fs_iget(dir->i_sb, ino);
 464         if (IS_ERR(inode)) {
 465                 err = PTR_ERR(inode);
 466                 goto out;
 467         }
 468
 469         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 470                 err = __recover_dot_dentries(dir, root_ino);
 471                 if (err)
 472                         goto out_iput;
 473         }
 474
 475         if (f2fs_has_inline_dots(inode)) {
 476                 err = __recover_dot_dentries(inode, dir->i_ino);
 477                 if (err)
 478                         goto out_iput;
 479         }
 480         if (f2fs_encrypted_inode(dir) &&
 481             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 482             !fscrypt_has_permitted_context(dir, inode)) {
 483                 f2fs_msg(inode->i_sb, KERN_WARNING,
 484                          "Inconsistent encryption contexts: %lu/%lu",
 485                          dir->i_ino, inode->i_ino);
 486                 err = -EPERM;
 487                 goto out_iput;
 488         }
 489 out_splice:
 490         new = d_splice_alias(inode, dentry);
 491         err = PTR_ERR_OR_ZERO(new);
 492         trace_f2fs_lookup_end(dir, dentry, ino, err);
 493         return new;
 494 out_iput:
 495         iput(inode);
 496 out:
 497         trace_f2fs_lookup_end(dir, dentry, ino, err);
 498         return ERR_PTR(err);
 499 }
 500
 501 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 502 {
 503         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 504         struct inode *inode = d_inode(dentry);
 505         struct f2fs_dir_entry *de;
 506         struct page *page;
 507         int err = -ENOENT;
 508
 509         trace_f2fs_unlink_enter(dir, dentry);
 510
 511         if (unlikely(f2fs_cp_error(sbi)))
 512                 return -EIO;
 513
 514         err = dquot_initialize(dir);
 515         if (err)
 516                 return err;
 517         err = dquot_initialize(inode);
 518         if (err)
 519                 return err;
 520
 521         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 522         if (!de) {
 523                 if (IS_ERR(page))
 524                         err = PTR_ERR(page);
 525                 goto fail;
 526         }
 527
 528         f2fs_balance_fs(sbi, true);
 529
 530         f2fs_lock_op(sbi);
 531         err = f2fs_acquire_orphan_inode(sbi);
 532         if (err) {
 533                 f2fs_unlock_op(sbi);
 534                 f2fs_put_page(page, 0);
 535                 goto fail;
 536         }
 537         f2fs_delete_entry(de, page, dir, inode);
 538         f2fs_unlock_op(sbi);
 539
 540         if (IS_DIRSYNC(dir))
 541                 f2fs_sync_fs(sbi->sb, 1);
 542 fail:
 543         trace_f2fs_unlink_exit(inode, err);
 544         return err;
 545 }
 546
 547 static const char *f2fs_get_link(struct dentry *dentry,
 548                                  struct inode *inode,
 549                                  struct delayed_call *done)
 550 {
 551         const char *link = page_get_link(dentry, inode, done);
 552         if (!IS_ERR(link) && !*link) {
 553                 /* this is broken symlink case */
 554                 do_delayed_call(done);
 555                 clear_delayed_call(done);
 556                 link = ERR_PTR(-ENOENT);
 557         }
 558         return link;
 559 }
 560
 561 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 562                                         const char *symname)
 563 {
 564         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 565         struct inode *inode;
 566         size_t len = strlen(symname);
 567         struct fscrypt_str disk_link;
 568         int err;
 569
 570         if (unlikely(f2fs_cp_error(sbi)))
 571                 return -EIO;
 572
 573         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 574                                       &disk_link);
 575         if (err)
 576                 return err;
 577
 578         err = dquot_initialize(dir);
 579         if (err)
 580                 return err;
 581
 582         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 583         if (IS_ERR(inode))
 584                 return PTR_ERR(inode);
 585
 586         if (IS_ENCRYPTED(inode))
 587                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 588         else
 589                 inode->i_op = &f2fs_symlink_inode_operations;
 590         inode_nohighmem(inode);
 591         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 592
 593         f2fs_lock_op(sbi);
 594         err = f2fs_add_link(dentry, inode);
 595         if (err)
 596                 goto out_f2fs_handle_failed_inode;
 597         f2fs_unlock_op(sbi);
 598         f2fs_alloc_nid_done(sbi, inode->i_ino);
 599
 600         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 601         if (err)
 602                 goto err_out;
 603
 604         err = page_symlink(inode, disk_link.name, disk_link.len);
 605
 606 err_out:
 607         d_instantiate_new(dentry, inode);
 608
 609         /*
 610          * Let's flush symlink data in order to avoid broken symlink as much as
 611          * possible. Nevertheless, fsyncing is the best way, but there is no
 612          * way to get a file descriptor in order to flush that.
 613          *
 614          * Note that, it needs to do dir->fsync to make this recoverable.
 615          * If the symlink path is stored into inline_data, there is no
 616          * performance regression.
 617          */
 618         if (!err) {
 619                 filemap_write_and_wait_range(inode->i_mapping, 0,
 620                                                         disk_link.len - 1);
 621
 622                 if (IS_DIRSYNC(dir))
 623                         f2fs_sync_fs(sbi->sb, 1);
 624         } else {
 625                 f2fs_unlink(dir, dentry);
 626         }
 627
 628         f2fs_balance_fs(sbi, true);
 629         goto out_free_encrypted_link;
 630
 631 out_f2fs_handle_failed_inode:
 632         f2fs_handle_failed_inode(inode);
 633 out_free_encrypted_link:
 634         if (disk_link.name != (unsigned char *)symname)
 635                 kfree(disk_link.name);
 636         return err;
 637 }
 638
 639 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 640 {
 641         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 642         struct inode *inode;
 643         int err;
 644
 645         if (unlikely(f2fs_cp_error(sbi)))
 646                 return -EIO;
 647
 648         err = dquot_initialize(dir);
 649         if (err)
 650                 return err;
 651
 652         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 653         if (IS_ERR(inode))
 654                 return PTR_ERR(inode);
 655
 656         inode->i_op = &f2fs_dir_inode_operations;
 657         inode->i_fop = &f2fs_dir_operations;
 658         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 659         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 660
 661         set_inode_flag(inode, FI_INC_LINK);
 662         f2fs_lock_op(sbi);
 663         err = f2fs_add_link(dentry, inode);
 664         if (err)
 665                 goto out_fail;
 666         f2fs_unlock_op(sbi);
 667
 668         f2fs_alloc_nid_done(sbi, inode->i_ino);
 669
 670         d_instantiate_new(dentry, inode);
 671
 672         if (IS_DIRSYNC(dir))
 673                 f2fs_sync_fs(sbi->sb, 1);
 674
 675         f2fs_balance_fs(sbi, true);
 676         return 0;
 677
 678 out_fail:
 679         clear_inode_flag(inode, FI_INC_LINK);
 680         f2fs_handle_failed_inode(inode);
 681         return err;
 682 }
 683
 684 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 685 {
 686         struct inode *inode = d_inode(dentry);
 687         if (f2fs_empty_dir(inode))
 688                 return f2fs_unlink(dir, dentry);
 689         return -ENOTEMPTY;
 690 }
 691
 692 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 693                                 umode_t mode, dev_t rdev)
 694 {
 695         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 696         struct inode *inode;
 697         int err = 0;
 698
 699         if (unlikely(f2fs_cp_error(sbi)))
 700                 return -EIO;
 701
 702         err = dquot_initialize(dir);
 703         if (err)
 704                 return err;
 705
 706         inode = f2fs_new_inode(dir, mode);
 707         if (IS_ERR(inode))
 708                 return PTR_ERR(inode);
 709
 710         init_special_inode(inode, inode->i_mode, rdev);
 711         inode->i_op = &f2fs_special_inode_operations;
 712
 713         f2fs_lock_op(sbi);
 714         err = f2fs_add_link(dentry, inode);
 715         if (err)
 716                 goto out;
 717         f2fs_unlock_op(sbi);
 718
 719         f2fs_alloc_nid_done(sbi, inode->i_ino);
 720
 721         d_instantiate_new(dentry, inode);
 722
 723         if (IS_DIRSYNC(dir))
 724                 f2fs_sync_fs(sbi->sb, 1);
 725
 726         f2fs_balance_fs(sbi, true);
 727         return 0;
 728 out:
 729         f2fs_handle_failed_inode(inode);
 730         return err;
 731 }
 732
 733 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 734                                         umode_t mode, struct inode **whiteout)
 735 {
 736         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 737         struct inode *inode;
 738         int err;
 739
 740         err = dquot_initialize(dir);
 741         if (err)
 742                 return err;
 743
 744         inode = f2fs_new_inode(dir, mode);
 745         if (IS_ERR(inode))
 746                 return PTR_ERR(inode);
 747
 748         if (whiteout) {
 749                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 750                 inode->i_op = &f2fs_special_inode_operations;
 751         } else {
 752                 inode->i_op = &f2fs_file_inode_operations;
 753                 inode->i_fop = &f2fs_file_operations;
 754                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 755         }
 756
 757         f2fs_lock_op(sbi);
 758         err = f2fs_acquire_orphan_inode(sbi);
 759         if (err)
 760                 goto out;
 761
 762         err = f2fs_do_tmpfile(inode, dir);
 763         if (err)
 764                 goto release_out;
 765
 766         /*
 767          * add this non-linked tmpfile to orphan list, in this way we could
 768          * remove all unused data of tmpfile after abnormal power-off.
 769          */
 770         f2fs_add_orphan_inode(inode);
 771         f2fs_alloc_nid_done(sbi, inode->i_ino);
 772
 773         if (whiteout) {
 774                 f2fs_i_links_write(inode, false);
 775
 776                 spin_lock(&inode->i_lock);
 777                 inode->i_state |= I_LINKABLE;
 778                 spin_unlock(&inode->i_lock);
 779
 780                 *whiteout = inode;
 781         } else {
 782                 d_tmpfile(dentry, inode);
 783         }
 784         /* link_count was changed by d_tmpfile as well. */
 785         f2fs_unlock_op(sbi);
 786         unlock_new_inode(inode);
 787
 788         f2fs_balance_fs(sbi, true);
 789         return 0;
 790
 791 release_out:
 792         f2fs_release_orphan_inode(sbi);
 793 out:
 794         f2fs_handle_failed_inode(inode);
 795         return err;
 796 }
 797
 798 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 799 {
 800         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 801
 802         if (unlikely(f2fs_cp_error(sbi)))
 803                 return -EIO;
 804
 805         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 806                 int err = fscrypt_get_encryption_info(dir);
 807                 if (err)
 808                         return err;
 809         }
 810
 811         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 812 }
 813
 814 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 815 {
 816         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 817                 return -EIO;
 818
 819         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 820 }
 821
 822 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 823                         struct inode *new_dir, struct dentry *new_dentry,
 824                         unsigned int flags)
 825 {
 826         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 827         struct inode *old_inode = d_inode(old_dentry);
 828         struct inode *new_inode = d_inode(new_dentry);
 829         struct inode *whiteout = NULL;
 830         struct page *old_dir_page;
 831         struct page *old_page, *new_page = NULL;
 832         struct f2fs_dir_entry *old_dir_entry = NULL;
 833         struct f2fs_dir_entry *old_entry;
 834         struct f2fs_dir_entry *new_entry;
 835         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 836         int err = -ENOENT;
 837
 838         if (unlikely(f2fs_cp_error(sbi)))
 839                 return -EIO;
 840
 841         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 842                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 843                         F2FS_I(old_dentry->d_inode)->i_projid)))
 844                 return -EXDEV;
 845
 846         if (flags & RENAME_WHITEOUT) {
 847                 err = f2fs_create_whiteout(old_dir, &whiteout);
 848                 if (err)
 849                         return err;
 850         }
 851
 852         err = dquot_initialize(old_dir);
 853         if (err)
 854                 goto out;
 855
 856         err = dquot_initialize(new_dir);
 857         if (err)
 858                 goto out;
 859
 860         if (new_inode) {
 861                 err = dquot_initialize(new_inode);
 862                 if (err)
 863                         goto out;
 864         }
 865
 866         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 867         if (!old_entry) {
 868                 if (IS_ERR(old_page))
 869                         err = PTR_ERR(old_page);
 870                 goto out;
 871         }
 872
 873         if (S_ISDIR(old_inode->i_mode)) {
 874                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 875                 if (!old_dir_entry) {
 876                         if (IS_ERR(old_dir_page))
 877                                 err = PTR_ERR(old_dir_page);
 878                         goto out_old;
 879                 }
 880         }
 881
 882         if (new_inode) {
 883
 884                 err = -ENOTEMPTY;
 885                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 886                         goto out_dir;
 887
 888                 err = -ENOENT;
 889                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 890                                                 &new_page);
 891                 if (!new_entry) {
 892                         if (IS_ERR(new_page))
 893                                 err = PTR_ERR(new_page);
 894                         goto out_dir;
 895                 }
 896
 897                 f2fs_balance_fs(sbi, true);
 898
 899                 f2fs_lock_op(sbi);
 900
 901                 err = f2fs_acquire_orphan_inode(sbi);
 902                 if (err)
 903                         goto put_out_dir;
 904
 905                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 906
 907                 new_inode->i_ctime = current_time(new_inode);
 908                 down_write(&F2FS_I(new_inode)->i_sem);
 909                 if (old_dir_entry)
 910                         f2fs_i_links_write(new_inode, false);
 911                 f2fs_i_links_write(new_inode, false);
 912                 up_write(&F2FS_I(new_inode)->i_sem);
 913
 914                 if (!new_inode->i_nlink)
 915                         f2fs_add_orphan_inode(new_inode);
 916                 else
 917                         f2fs_release_orphan_inode(sbi);
 918         } else {
 919                 f2fs_balance_fs(sbi, true);
 920
 921                 f2fs_lock_op(sbi);
 922
 923                 err = f2fs_add_link(new_dentry, old_inode);
 924                 if (err) {
 925                         f2fs_unlock_op(sbi);
 926                         goto out_dir;
 927                 }
 928
 929                 if (old_dir_entry)
 930                         f2fs_i_links_write(new_dir, true);
 931
 932                 /*
 933                  * old entry and new entry can locate in the same inline
 934                  * dentry in inode, when attaching new entry in inline dentry,
 935                  * it could force inline dentry conversion, after that,
 936                  * old_entry and old_page will point to wrong address, in
 937                  * order to avoid this, let's do the check and update here.
 938                  */
 939                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 940                         f2fs_put_page(old_page, 0);
 941                         old_page = NULL;
 942
 943                         old_entry = f2fs_find_entry(old_dir,
 944                                                 &old_dentry->d_name, &old_page);
 945                         if (!old_entry) {
 946                                 err = -ENOENT;
 947                                 if (IS_ERR(old_page))
 948                                         err = PTR_ERR(old_page);
 949                                 f2fs_unlock_op(sbi);
 950                                 goto out_dir;
 951                         }
 952                 }
 953         }
 954
 955         down_write(&F2FS_I(old_inode)->i_sem);
 956         if (!old_dir_entry || whiteout)
 957                 file_lost_pino(old_inode);
 958         else
 959                 /* adjust dir's i_pino to pass fsck check */
 960                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
 961         up_write(&F2FS_I(old_inode)->i_sem);
 962
 963         old_inode->i_ctime = current_time(old_inode);
 964         f2fs_mark_inode_dirty_sync(old_inode, false);
 965
 966         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 967
 968         if (whiteout) {
 969                 set_inode_flag(whiteout, FI_INC_LINK);
 970                 err = f2fs_add_link(old_dentry, whiteout);
 971                 if (err)
 972                         goto put_out_dir;
 973
 974                 spin_lock(&whiteout->i_lock);
 975                 whiteout->i_state &= ~I_LINKABLE;
 976                 spin_unlock(&whiteout->i_lock);
 977
 978                 iput(whiteout);
 979         }
 980
 981         if (old_dir_entry) {
 982                 if (old_dir != new_dir && !whiteout)
 983                         f2fs_set_link(old_inode, old_dir_entry,
 984                                                 old_dir_page, new_dir);
 985                 else
 986                         f2fs_put_page(old_dir_page, 0);
 987                 f2fs_i_links_write(old_dir, false);
 988         }
 989         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 990                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 991                 if (S_ISDIR(old_inode->i_mode))
 992                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
 993                                                         TRANS_DIR_INO);
 994         }
 995
 996         f2fs_unlock_op(sbi);
 997
 998         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 999                 f2fs_sync_fs(sbi->sb, 1);
1000         return 0;
1001
1002 put_out_dir:
1003         f2fs_unlock_op(sbi);
1004         if (new_page)
1005                 f2fs_put_page(new_page, 0);
1006 out_dir:
1007         if (old_dir_entry)
1008                 f2fs_put_page(old_dir_page, 0);
1009 out_old:
1010         f2fs_put_page(old_page, 0);
1011 out:
1012         if (whiteout)
1013                 iput(whiteout);
1014         return err;
1015 }
1016
1017 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1018                              struct inode *new_dir, struct dentry *new_dentry)
1019 {
1020         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1021         struct inode *old_inode = d_inode(old_dentry);
1022         struct inode *new_inode = d_inode(new_dentry);
1023         struct page *old_dir_page, *new_dir_page;
1024         struct page *old_page, *new_page;
1025         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1026         struct f2fs_dir_entry *old_entry, *new_entry;
1027         int old_nlink = 0, new_nlink = 0;
1028         int err = -ENOENT;
1029
1030         if (unlikely(f2fs_cp_error(sbi)))
1031                 return -EIO;
1032
1033         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1034                         !projid_eq(F2FS_I(new_dir)->i_projid,
1035                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1036             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1037                         !projid_eq(F2FS_I(old_dir)->i_projid,
1038                         F2FS_I(new_dentry->d_inode)->i_projid)))
1039                 return -EXDEV;
1040
1041         err = dquot_initialize(old_dir);
1042         if (err)
1043                 goto out;
1044
1045         err = dquot_initialize(new_dir);
1046         if (err)
1047                 goto out;
1048
1049         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1050         if (!old_entry) {
1051                 if (IS_ERR(old_page))
1052                         err = PTR_ERR(old_page);
1053                 goto out;
1054         }
1055
1056         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1057         if (!new_entry) {
1058                 if (IS_ERR(new_page))
1059                         err = PTR_ERR(new_page);
1060                 goto out_old;
1061         }
1062
1063         /* prepare for updating ".." directory entry info later */
1064         if (old_dir != new_dir) {
1065                 if (S_ISDIR(old_inode->i_mode)) {
1066                         old_dir_entry = f2fs_parent_dir(old_inode,
1067                                                         &old_dir_page);
1068                         if (!old_dir_entry) {
1069                                 if (IS_ERR(old_dir_page))
1070                                         err = PTR_ERR(old_dir_page);
1071                                 goto out_new;
1072                         }
1073                 }
1074
1075                 if (S_ISDIR(new_inode->i_mode)) {
1076                         new_dir_entry = f2fs_parent_dir(new_inode,
1077                                                         &new_dir_page);
1078                         if (!new_dir_entry) {
1079                                 if (IS_ERR(new_dir_page))
1080                                         err = PTR_ERR(new_dir_page);
1081                                 goto out_old_dir;
1082                         }
1083                 }
1084         }
1085
1086         /*
1087          * If cross rename between file and directory those are not
1088          * in the same directory, we will inc nlink of file's parent
1089          * later, so we should check upper boundary of its nlink.
1090          */
1091         if ((!old_dir_entry || !new_dir_entry) &&
1092                                 old_dir_entry != new_dir_entry) {
1093                 old_nlink = old_dir_entry ? -1 : 1;
1094                 new_nlink = -old_nlink;
1095                 err = -EMLINK;
1096                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1097                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1098                         goto out_new_dir;
1099         }
1100
1101         f2fs_balance_fs(sbi, true);
1102
1103         f2fs_lock_op(sbi);
1104
1105         /* update ".." directory entry info of old dentry */
1106         if (old_dir_entry)
1107                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1108
1109         /* update ".." directory entry info of new dentry */
1110         if (new_dir_entry)
1111                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1112
1113         /* update directory entry info of old dir inode */
1114         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1115
1116         down_write(&F2FS_I(old_inode)->i_sem);
1117         if (!old_dir_entry)
1118                 file_lost_pino(old_inode);
1119         else
1120                 /* adjust dir's i_pino to pass fsck check */
1121                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1122         up_write(&F2FS_I(old_inode)->i_sem);
1123
1124         old_dir->i_ctime = current_time(old_dir);
1125         if (old_nlink) {
1126                 down_write(&F2FS_I(old_dir)->i_sem);
1127                 f2fs_i_links_write(old_dir, old_nlink > 0);
1128                 up_write(&F2FS_I(old_dir)->i_sem);
1129         }
1130         f2fs_mark_inode_dirty_sync(old_dir, false);
1131
1132         /* update directory entry info of new dir inode */
1133         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1134
1135         down_write(&F2FS_I(new_inode)->i_sem);
1136         if (!new_dir_entry)
1137                 file_lost_pino(new_inode);
1138         else
1139                 /* adjust dir's i_pino to pass fsck check */
1140                 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1141         up_write(&F2FS_I(new_inode)->i_sem);
1142
1143         new_dir->i_ctime = current_time(new_dir);
1144         if (new_nlink) {
1145                 down_write(&F2FS_I(new_dir)->i_sem);
1146                 f2fs_i_links_write(new_dir, new_nlink > 0);
1147                 up_write(&F2FS_I(new_dir)->i_sem);
1148         }
1149         f2fs_mark_inode_dirty_sync(new_dir, false);
1150
1151         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1152                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1153                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1154         }
1155
1156         f2fs_unlock_op(sbi);
1157
1158         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1159                 f2fs_sync_fs(sbi->sb, 1);
1160         return 0;
1161 out_new_dir:
1162         if (new_dir_entry) {
1163                 f2fs_put_page(new_dir_page, 0);
1164         }
1165 out_old_dir:
1166         if (old_dir_entry) {
1167                 f2fs_put_page(old_dir_page, 0);
1168         }
1169 out_new:
1170         f2fs_put_page(new_page, 0);
1171 out_old:
1172         f2fs_put_page(old_page, 0);
1173 out:
1174         return err;
1175 }
1176
1177 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1178                         struct inode *new_dir, struct dentry *new_dentry,
1179                         unsigned int flags)
1180 {
1181         int err;
1182
1183         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1184                 return -EINVAL;
1185
1186         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1187                                      flags);
1188         if (err)
1189                 return err;
1190
1191         if (flags & RENAME_EXCHANGE) {
1192                 return f2fs_cross_rename(old_dir, old_dentry,
1193                                          new_dir, new_dentry);
1194         }
1195         /*
1196          * VFS has already handled the new dentry existence case,
1197          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1198          */
1199         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1200 }
1201
1202 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1203                                            struct inode *inode,
1204                                            struct delayed_call *done)
1205 {
1206         struct page *page;
1207         const char *target;
1208
1209         if (!dentry)
1210                 return ERR_PTR(-ECHILD);
1211
1212         page = read_mapping_page(inode->i_mapping, 0, NULL);
1213         if (IS_ERR(page))
1214                 return ERR_CAST(page);
1215
1216         target = fscrypt_get_symlink(inode, page_address(page),
1217                                      inode->i_sb->s_blocksize, done);
1218         put_page(page);
1219         return target;
1220 }
1221
1222 static int f2fs_encrypted_symlink_getattr(const struct path *path,
1223                                           struct kstat *stat, u32 request_mask,
1224                                           unsigned int query_flags)
1225 {
1226         f2fs_getattr(path, stat, request_mask, query_flags);
1227
1228         return fscrypt_symlink_getattr(path, stat);
1229 }
1230
1231 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1232         .get_link       = f2fs_encrypted_get_link,
1233         .getattr        = f2fs_encrypted_symlink_getattr,
1234         .setattr        = f2fs_setattr,
1235 #ifdef CONFIG_F2FS_FS_XATTR
1236         .listxattr      = f2fs_listxattr,
1237 #endif
1238 };
1239
1240 const struct inode_operations f2fs_dir_inode_operations = {
1241         .create         = f2fs_create,
1242         .lookup         = f2fs_lookup,
1243         .link           = f2fs_link,
1244         .unlink         = f2fs_unlink,
1245         .symlink        = f2fs_symlink,
1246         .mkdir          = f2fs_mkdir,
1247         .rmdir          = f2fs_rmdir,
1248         .mknod          = f2fs_mknod,
1249         .rename         = f2fs_rename2,
1250         .tmpfile        = f2fs_tmpfile,
1251         .getattr        = f2fs_getattr,
1252         .setattr        = f2fs_setattr,
1253         .get_acl        = f2fs_get_acl,
1254         .set_acl        = f2fs_set_acl,
1255 #ifdef CONFIG_F2FS_FS_XATTR
1256         .listxattr      = f2fs_listxattr,
1257 #endif
1258 };
1259
1260 const struct inode_operations f2fs_symlink_inode_operations = {
1261         .get_link       = f2fs_get_link,
1262         .getattr        = f2fs_getattr,
1263         .setattr        = f2fs_setattr,
1264 #ifdef CONFIG_F2FS_FS_XATTR
1265         .listxattr      = f2fs_listxattr,
1266 #endif
1267 };
1268
1269 const struct inode_operations f2fs_special_inode_operations = {
1270         .getattr        = f2fs_getattr,
1271         .setattr        = f2fs_setattr,
1272         .get_acl        = f2fs_get_acl,
1273         .set_acl        = f2fs_set_acl,
1274 #ifdef CONFIG_F2FS_FS_XATTR
1275         .listxattr      = f2fs_listxattr,
1276 #endif
1277 };