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
  19 #include "f2fs.h"
  20 #include "node.h"
  21 #include "xattr.h"
  22 #include "acl.h"
  23 #include <trace/events/f2fs.h>
  24
  25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  26 {
  27         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  28         nid_t ino;
  29         struct inode *inode;
  30         bool nid_free = false;
  31         int err;
  32
  33         inode = new_inode(dir->i_sb);
  34         if (!inode)
  35                 return ERR_PTR(-ENOMEM);
  36
  37         f2fs_lock_op(sbi);
  38         if (!alloc_nid(sbi, &ino)) {
  39                 f2fs_unlock_op(sbi);
  40                 err = -ENOSPC;
  41                 goto fail;
  42         }
  43         f2fs_unlock_op(sbi);
  44
  45         inode_init_owner(inode, dir, mode);
  46
  47         inode->i_ino = ino;
  48         inode->i_blocks = 0;
  49         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
  50         inode->i_generation = sbi->s_next_generation++;
  51
  52         err = insert_inode_locked(inode);
  53         if (err) {
  54                 err = -EINVAL;
  55                 nid_free = true;
  56                 goto out;
  57         }
  58
  59         /* If the directory encrypted, then we should encrypt the inode. */
  60         if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
  61                 f2fs_set_encrypted_inode(inode);
  62
  63         if (f2fs_may_inline_data(inode))
  64                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
  65         if (f2fs_may_inline_dentry(inode))
  66                 set_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
  67
  68         stat_inc_inline_inode(inode);
  69         stat_inc_inline_dir(inode);
  70
  71         trace_f2fs_new_inode(inode, 0);
  72         mark_inode_dirty(inode);
  73         return inode;
  74
  75 out:
  76         clear_nlink(inode);
  77         unlock_new_inode(inode);
  78 fail:
  79         trace_f2fs_new_inode(inode, err);
  80         make_bad_inode(inode);
  81         iput(inode);
  82         if (nid_free)
  83                 alloc_nid_failed(sbi, ino);
  84         return ERR_PTR(err);
  85 }
  86
  87 static int is_multimedia_file(const unsigned char *s, const char *sub)
  88 {
  89         size_t slen = strlen(s);
  90         size_t sublen = strlen(sub);
  91
  92         if (sublen > slen)
  93                 return 0;
  94
  95         return !strncasecmp(s + slen - sublen, sub, sublen);
  96 }
  97
  98 /*
  99  * Set multimedia files as cold files for hot/cold data separation
 100  */
 101 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
 102                 const unsigned char *name)
 103 {
 104         int i;
 105         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 106
 107         int count = le32_to_cpu(sbi->raw_super->extension_count);
 108         for (i = 0; i < count; i++) {
 109                 if (is_multimedia_file(name, extlist[i])) {
 110                         file_set_cold(inode);
 111                         break;
 112                 }
 113         }
 114 }
 115
 116 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 117                                                 bool excl)
 118 {
 119         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 120         struct inode *inode;
 121         nid_t ino = 0;
 122         int err;
 123
 124         f2fs_balance_fs(sbi);
 125
 126         inode = f2fs_new_inode(dir, mode);
 127         if (IS_ERR(inode))
 128                 return PTR_ERR(inode);
 129
 130         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 131                 set_cold_files(sbi, inode, dentry->d_name.name);
 132
 133         inode->i_op = &f2fs_file_inode_operations;
 134         inode->i_fop = &f2fs_file_operations;
 135         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 136         ino = inode->i_ino;
 137
 138         f2fs_lock_op(sbi);
 139         err = f2fs_add_link(dentry, inode);
 140         if (err)
 141                 goto out;
 142         f2fs_unlock_op(sbi);
 143
 144         alloc_nid_done(sbi, ino);
 145
 146         d_instantiate(dentry, inode);
 147         unlock_new_inode(inode);
 148
 149         if (IS_DIRSYNC(dir))
 150                 f2fs_sync_fs(sbi->sb, 1);
 151         return 0;
 152 out:
 153         handle_failed_inode(inode);
 154         return err;
 155 }
 156
 157 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 158                 struct dentry *dentry)
 159 {
 160         struct inode *inode = d_inode(old_dentry);
 161         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 162         int err;
 163
 164         if (f2fs_encrypted_inode(dir) &&
 165                 !f2fs_is_child_context_consistent_with_parent(dir, inode))
 166                 return -EPERM;
 167
 168         f2fs_balance_fs(sbi);
 169
 170         inode->i_ctime = CURRENT_TIME;
 171         ihold(inode);
 172
 173         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 174         f2fs_lock_op(sbi);
 175         err = f2fs_add_link(dentry, inode);
 176         if (err)
 177                 goto out;
 178         f2fs_unlock_op(sbi);
 179
 180         d_instantiate(dentry, inode);
 181
 182         if (IS_DIRSYNC(dir))
 183                 f2fs_sync_fs(sbi->sb, 1);
 184         return 0;
 185 out:
 186         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 187         iput(inode);
 188         f2fs_unlock_op(sbi);
 189         return err;
 190 }
 191
 192 struct dentry *f2fs_get_parent(struct dentry *child)
 193 {
 194         struct qstr dotdot = QSTR_INIT("..", 2);
 195         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot);
 196         if (!ino)
 197                 return ERR_PTR(-ENOENT);
 198         return d_obtain_alias(f2fs_iget(d_inode(child)->i_sb, ino));
 199 }
 200
 201 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 202 {
 203         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 204         struct qstr dot = QSTR_INIT(".", 1);
 205         struct qstr dotdot = QSTR_INIT("..", 2);
 206         struct f2fs_dir_entry *de;
 207         struct page *page;
 208         int err = 0;
 209
 210         f2fs_lock_op(sbi);
 211
 212         de = f2fs_find_entry(dir, &dot, &page);
 213         if (de) {
 214                 f2fs_dentry_kunmap(dir, page);
 215                 f2fs_put_page(page, 0);
 216         } else {
 217                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 218                 if (err)
 219                         goto out;
 220         }
 221
 222         de = f2fs_find_entry(dir, &dotdot, &page);
 223         if (de) {
 224                 f2fs_dentry_kunmap(dir, page);
 225                 f2fs_put_page(page, 0);
 226         } else {
 227                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 228         }
 229 out:
 230         if (!err) {
 231                 clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS);
 232                 mark_inode_dirty(dir);
 233         }
 234
 235         f2fs_unlock_op(sbi);
 236         return err;
 237 }
 238
 239 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 240                 unsigned int flags)
 241 {
 242         struct inode *inode = NULL;
 243         struct f2fs_dir_entry *de;
 244         struct page *page;
 245         nid_t ino;
 246         int err = 0;
 247
 248         if (dentry->d_name.len > F2FS_NAME_LEN)
 249                 return ERR_PTR(-ENAMETOOLONG);
 250
 251         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 252         if (!de)
 253                 return d_splice_alias(inode, dentry);
 254
 255         ino = le32_to_cpu(de->ino);
 256         f2fs_dentry_kunmap(dir, page);
 257         f2fs_put_page(page, 0);
 258
 259         inode = f2fs_iget(dir->i_sb, ino);
 260         if (IS_ERR(inode))
 261                 return ERR_CAST(inode);
 262
 263         if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode) &&
 264                 !f2fs_is_child_context_consistent_with_parent(dir, inode)) {
 265                 iput(inode);
 266                 f2fs_msg(inode->i_sb, KERN_WARNING,
 267                                 "Inconsistent encryption contexts: %lu/%lu\n",
 268                                 (unsigned long)dir->i_ino,
 269                                 (unsigned long)inode->i_ino);
 270                 return ERR_PTR(-EPERM);
 271         }
 272
 273         if (f2fs_has_inline_dots(inode)) {
 274                 err = __recover_dot_dentries(inode, dir->i_ino);
 275                 if (err)
 276                         goto err_out;
 277         }
 278         return d_splice_alias(inode, dentry);
 279
 280 err_out:
 281         iget_failed(inode);
 282         return ERR_PTR(err);
 283 }
 284
 285 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 286 {
 287         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 288         struct inode *inode = d_inode(dentry);
 289         struct f2fs_dir_entry *de;
 290         struct page *page;
 291         int err = -ENOENT;
 292
 293         trace_f2fs_unlink_enter(dir, dentry);
 294         f2fs_balance_fs(sbi);
 295
 296         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 297         if (!de)
 298                 goto fail;
 299
 300         f2fs_lock_op(sbi);
 301         err = acquire_orphan_inode(sbi);
 302         if (err) {
 303                 f2fs_unlock_op(sbi);
 304                 f2fs_dentry_kunmap(dir, page);
 305                 f2fs_put_page(page, 0);
 306                 goto fail;
 307         }
 308         f2fs_delete_entry(de, page, dir, inode);
 309         f2fs_unlock_op(sbi);
 310
 311         /* In order to evict this inode, we set it dirty */
 312         mark_inode_dirty(inode);
 313
 314         if (IS_DIRSYNC(dir))
 315                 f2fs_sync_fs(sbi->sb, 1);
 316 fail:
 317         trace_f2fs_unlink_exit(inode, err);
 318         return err;
 319 }
 320
 321 static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
 322 {
 323         struct page *page = page_follow_link_light(dentry, nd);
 324
 325         if (IS_ERR_OR_NULL(page))
 326                 return page;
 327
 328         /* this is broken symlink case */
 329         if (*nd_get_link(nd) == 0) {
 330                 page_put_link(dentry, nd, page);
 331                 return ERR_PTR(-ENOENT);
 332         }
 333         return page;
 334 }
 335
 336 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 337                                         const char *symname)
 338 {
 339         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 340         struct inode *inode;
 341         size_t symlen = strlen(symname) + 1;
 342         int err;
 343
 344         f2fs_balance_fs(sbi);
 345
 346         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 347         if (IS_ERR(inode))
 348                 return PTR_ERR(inode);
 349
 350         inode->i_op = &f2fs_symlink_inode_operations;
 351         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 352
 353         f2fs_lock_op(sbi);
 354         err = f2fs_add_link(dentry, inode);
 355         if (err)
 356                 goto out;
 357         f2fs_unlock_op(sbi);
 358
 359         err = page_symlink(inode, symname, symlen);
 360         alloc_nid_done(sbi, inode->i_ino);
 361
 362         d_instantiate(dentry, inode);
 363         unlock_new_inode(inode);
 364
 365         /*
 366          * Let's flush symlink data in order to avoid broken symlink as much as
 367          * possible. Nevertheless, fsyncing is the best way, but there is no
 368          * way to get a file descriptor in order to flush that.
 369          *
 370          * Note that, it needs to do dir->fsync to make this recoverable.
 371          * If the symlink path is stored into inline_data, there is no
 372          * performance regression.
 373          */
 374         filemap_write_and_wait_range(inode->i_mapping, 0, symlen - 1);
 375
 376         if (IS_DIRSYNC(dir))
 377                 f2fs_sync_fs(sbi->sb, 1);
 378         return err;
 379 out:
 380         handle_failed_inode(inode);
 381         return err;
 382 }
 383
 384 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 385 {
 386         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 387         struct inode *inode;
 388         int err;
 389
 390         f2fs_balance_fs(sbi);
 391
 392         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 393         if (IS_ERR(inode))
 394                 return PTR_ERR(inode);
 395
 396         inode->i_op = &f2fs_dir_inode_operations;
 397         inode->i_fop = &f2fs_dir_operations;
 398         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 399         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 400
 401         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 402         f2fs_lock_op(sbi);
 403         err = f2fs_add_link(dentry, inode);
 404         if (err)
 405                 goto out_fail;
 406         f2fs_unlock_op(sbi);
 407
 408         alloc_nid_done(sbi, inode->i_ino);
 409
 410         d_instantiate(dentry, inode);
 411         unlock_new_inode(inode);
 412
 413         if (IS_DIRSYNC(dir))
 414                 f2fs_sync_fs(sbi->sb, 1);
 415         return 0;
 416
 417 out_fail:
 418         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 419         handle_failed_inode(inode);
 420         return err;
 421 }
 422
 423 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 424 {
 425         struct inode *inode = d_inode(dentry);
 426         if (f2fs_empty_dir(inode))
 427                 return f2fs_unlink(dir, dentry);
 428         return -ENOTEMPTY;
 429 }
 430
 431 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 432                                 umode_t mode, dev_t rdev)
 433 {
 434         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 435         struct inode *inode;
 436         int err = 0;
 437
 438         if (!new_valid_dev(rdev))
 439                 return -EINVAL;
 440
 441         f2fs_balance_fs(sbi);
 442
 443         inode = f2fs_new_inode(dir, mode);
 444         if (IS_ERR(inode))
 445                 return PTR_ERR(inode);
 446
 447         init_special_inode(inode, inode->i_mode, rdev);
 448         inode->i_op = &f2fs_special_inode_operations;
 449
 450         f2fs_lock_op(sbi);
 451         err = f2fs_add_link(dentry, inode);
 452         if (err)
 453                 goto out;
 454         f2fs_unlock_op(sbi);
 455
 456         alloc_nid_done(sbi, inode->i_ino);
 457
 458         d_instantiate(dentry, inode);
 459         unlock_new_inode(inode);
 460
 461         if (IS_DIRSYNC(dir))
 462                 f2fs_sync_fs(sbi->sb, 1);
 463         return 0;
 464 out:
 465         handle_failed_inode(inode);
 466         return err;
 467 }
 468
 469 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 470                         struct inode *new_dir, struct dentry *new_dentry)
 471 {
 472         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 473         struct inode *old_inode = d_inode(old_dentry);
 474         struct inode *new_inode = d_inode(new_dentry);
 475         struct page *old_dir_page;
 476         struct page *old_page, *new_page;
 477         struct f2fs_dir_entry *old_dir_entry = NULL;
 478         struct f2fs_dir_entry *old_entry;
 479         struct f2fs_dir_entry *new_entry;
 480         int err = -ENOENT;
 481
 482         if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
 483                 !f2fs_is_child_context_consistent_with_parent(new_dir,
 484                                                         old_inode)) {
 485                 err = -EPERM;
 486                 goto out;
 487         }
 488
 489         f2fs_balance_fs(sbi);
 490
 491         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 492         if (!old_entry)
 493                 goto out;
 494
 495         if (S_ISDIR(old_inode->i_mode)) {
 496                 err = -EIO;
 497                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 498                 if (!old_dir_entry)
 499                         goto out_old;
 500         }
 501
 502         if (new_inode) {
 503
 504                 err = -ENOTEMPTY;
 505                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 506                         goto out_dir;
 507
 508                 err = -ENOENT;
 509                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 510                                                 &new_page);
 511                 if (!new_entry)
 512                         goto out_dir;
 513
 514                 f2fs_lock_op(sbi);
 515
 516                 err = acquire_orphan_inode(sbi);
 517                 if (err)
 518                         goto put_out_dir;
 519
 520                 if (update_dent_inode(old_inode, new_inode,
 521                                                 &new_dentry->d_name)) {
 522                         release_orphan_inode(sbi);
 523                         goto put_out_dir;
 524                 }
 525
 526                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 527
 528                 new_inode->i_ctime = CURRENT_TIME;
 529                 down_write(&F2FS_I(new_inode)->i_sem);
 530                 if (old_dir_entry)
 531                         drop_nlink(new_inode);
 532                 drop_nlink(new_inode);
 533                 up_write(&F2FS_I(new_inode)->i_sem);
 534
 535                 mark_inode_dirty(new_inode);
 536
 537                 if (!new_inode->i_nlink)
 538                         add_orphan_inode(sbi, new_inode->i_ino);
 539                 else
 540                         release_orphan_inode(sbi);
 541
 542                 update_inode_page(old_inode);
 543                 update_inode_page(new_inode);
 544         } else {
 545                 f2fs_lock_op(sbi);
 546
 547                 err = f2fs_add_link(new_dentry, old_inode);
 548                 if (err) {
 549                         f2fs_unlock_op(sbi);
 550                         goto out_dir;
 551                 }
 552
 553                 if (old_dir_entry) {
 554                         inc_nlink(new_dir);
 555                         update_inode_page(new_dir);
 556                 }
 557         }
 558
 559         down_write(&F2FS_I(old_inode)->i_sem);
 560         file_lost_pino(old_inode);
 561         if (new_inode && file_enc_name(new_inode))
 562                 file_set_enc_name(old_inode);
 563         up_write(&F2FS_I(old_inode)->i_sem);
 564
 565         old_inode->i_ctime = CURRENT_TIME;
 566         mark_inode_dirty(old_inode);
 567
 568         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 569
 570         if (old_dir_entry) {
 571                 if (old_dir != new_dir) {
 572                         f2fs_set_link(old_inode, old_dir_entry,
 573                                                 old_dir_page, new_dir);
 574                         update_inode_page(old_inode);
 575                 } else {
 576                         f2fs_dentry_kunmap(old_inode, old_dir_page);
 577                         f2fs_put_page(old_dir_page, 0);
 578                 }
 579                 drop_nlink(old_dir);
 580                 mark_inode_dirty(old_dir);
 581                 update_inode_page(old_dir);
 582         }
 583
 584         f2fs_unlock_op(sbi);
 585
 586         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 587                 f2fs_sync_fs(sbi->sb, 1);
 588         return 0;
 589
 590 put_out_dir:
 591         f2fs_unlock_op(sbi);
 592         f2fs_dentry_kunmap(new_dir, new_page);
 593         f2fs_put_page(new_page, 0);
 594 out_dir:
 595         if (old_dir_entry) {
 596                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 597                 f2fs_put_page(old_dir_page, 0);
 598         }
 599 out_old:
 600         f2fs_dentry_kunmap(old_dir, old_page);
 601         f2fs_put_page(old_page, 0);
 602 out:
 603         return err;
 604 }
 605
 606 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 607                              struct inode *new_dir, struct dentry *new_dentry)
 608 {
 609         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 610         struct inode *old_inode = d_inode(old_dentry);
 611         struct inode *new_inode = d_inode(new_dentry);
 612         struct page *old_dir_page, *new_dir_page;
 613         struct page *old_page, *new_page;
 614         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
 615         struct f2fs_dir_entry *old_entry, *new_entry;
 616         int old_nlink = 0, new_nlink = 0;
 617         int err = -ENOENT;
 618
 619         f2fs_balance_fs(sbi);
 620
 621         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 622         if (!old_entry)
 623                 goto out;
 624
 625         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
 626         if (!new_entry)
 627                 goto out_old;
 628
 629         /* prepare for updating ".." directory entry info later */
 630         if (old_dir != new_dir) {
 631                 if (S_ISDIR(old_inode->i_mode)) {
 632                         err = -EIO;
 633                         old_dir_entry = f2fs_parent_dir(old_inode,
 634                                                         &old_dir_page);
 635                         if (!old_dir_entry)
 636                                 goto out_new;
 637                 }
 638
 639                 if (S_ISDIR(new_inode->i_mode)) {
 640                         err = -EIO;
 641                         new_dir_entry = f2fs_parent_dir(new_inode,
 642                                                         &new_dir_page);
 643                         if (!new_dir_entry)
 644                                 goto out_old_dir;
 645                 }
 646         }
 647
 648         /*
 649          * If cross rename between file and directory those are not
 650          * in the same directory, we will inc nlink of file's parent
 651          * later, so we should check upper boundary of its nlink.
 652          */
 653         if ((!old_dir_entry || !new_dir_entry) &&
 654                                 old_dir_entry != new_dir_entry) {
 655                 old_nlink = old_dir_entry ? -1 : 1;
 656                 new_nlink = -old_nlink;
 657                 err = -EMLINK;
 658                 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
 659                         (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
 660                         goto out_new_dir;
 661         }
 662
 663         f2fs_lock_op(sbi);
 664
 665         err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
 666         if (err)
 667                 goto out_unlock;
 668         if (file_enc_name(new_inode))
 669                 file_set_enc_name(old_inode);
 670
 671         err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
 672         if (err)
 673                 goto out_undo;
 674         if (file_enc_name(old_inode))
 675                 file_set_enc_name(new_inode);
 676
 677         /* update ".." directory entry info of old dentry */
 678         if (old_dir_entry)
 679                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
 680
 681         /* update ".." directory entry info of new dentry */
 682         if (new_dir_entry)
 683                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
 684
 685         /* update directory entry info of old dir inode */
 686         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
 687
 688         down_write(&F2FS_I(old_inode)->i_sem);
 689         file_lost_pino(old_inode);
 690         up_write(&F2FS_I(old_inode)->i_sem);
 691
 692         update_inode_page(old_inode);
 693
 694         old_dir->i_ctime = CURRENT_TIME;
 695         if (old_nlink) {
 696                 down_write(&F2FS_I(old_dir)->i_sem);
 697                 if (old_nlink < 0)
 698                         drop_nlink(old_dir);
 699                 else
 700                         inc_nlink(old_dir);
 701                 up_write(&F2FS_I(old_dir)->i_sem);
 702         }
 703         mark_inode_dirty(old_dir);
 704         update_inode_page(old_dir);
 705
 706         /* update directory entry info of new dir inode */
 707         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 708
 709         down_write(&F2FS_I(new_inode)->i_sem);
 710         file_lost_pino(new_inode);
 711         up_write(&F2FS_I(new_inode)->i_sem);
 712
 713         update_inode_page(new_inode);
 714
 715         new_dir->i_ctime = CURRENT_TIME;
 716         if (new_nlink) {
 717                 down_write(&F2FS_I(new_dir)->i_sem);
 718                 if (new_nlink < 0)
 719                         drop_nlink(new_dir);
 720                 else
 721                         inc_nlink(new_dir);
 722                 up_write(&F2FS_I(new_dir)->i_sem);
 723         }
 724         mark_inode_dirty(new_dir);
 725         update_inode_page(new_dir);
 726
 727         f2fs_unlock_op(sbi);
 728
 729         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 730                 f2fs_sync_fs(sbi->sb, 1);
 731         return 0;
 732 out_undo:
 733         /*
 734          * Still we may fail to recover name info of f2fs_inode here
 735          * Drop it, once its name is set as encrypted
 736          */
 737         update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
 738 out_unlock:
 739         f2fs_unlock_op(sbi);
 740 out_new_dir:
 741         if (new_dir_entry) {
 742                 f2fs_dentry_kunmap(new_inode, new_dir_page);
 743                 f2fs_put_page(new_dir_page, 0);
 744         }
 745 out_old_dir:
 746         if (old_dir_entry) {
 747                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 748                 f2fs_put_page(old_dir_page, 0);
 749         }
 750 out_new:
 751         f2fs_dentry_kunmap(new_dir, new_page);
 752         f2fs_put_page(new_page, 0);
 753 out_old:
 754         f2fs_dentry_kunmap(old_dir, old_page);
 755         f2fs_put_page(old_page, 0);
 756 out:
 757         return err;
 758 }
 759
 760 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
 761                         struct inode *new_dir, struct dentry *new_dentry,
 762                         unsigned int flags)
 763 {
 764         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
 765                 return -EINVAL;
 766
 767         if (flags & RENAME_EXCHANGE) {
 768                 return f2fs_cross_rename(old_dir, old_dentry,
 769                                          new_dir, new_dentry);
 770         }
 771         /*
 772          * VFS has already handled the new dentry existence case,
 773          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
 774          */
 775         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry);
 776 }
 777
 778 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 779 {
 780         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 781         struct inode *inode;
 782         int err;
 783
 784         inode = f2fs_new_inode(dir, mode);
 785         if (IS_ERR(inode))
 786                 return PTR_ERR(inode);
 787
 788         inode->i_op = &f2fs_file_inode_operations;
 789         inode->i_fop = &f2fs_file_operations;
 790         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 791
 792         f2fs_lock_op(sbi);
 793         err = acquire_orphan_inode(sbi);
 794         if (err)
 795                 goto out;
 796
 797         err = f2fs_do_tmpfile(inode, dir);
 798         if (err)
 799                 goto release_out;
 800
 801         /*
 802          * add this non-linked tmpfile to orphan list, in this way we could
 803          * remove all unused data of tmpfile after abnormal power-off.
 804          */
 805         add_orphan_inode(sbi, inode->i_ino);
 806         f2fs_unlock_op(sbi);
 807
 808         alloc_nid_done(sbi, inode->i_ino);
 809
 810         d_tmpfile(dentry, inode);
 811         unlock_new_inode(inode);
 812         return 0;
 813
 814 release_out:
 815         release_orphan_inode(sbi);
 816 out:
 817         handle_failed_inode(inode);
 818         return err;
 819 }
 820
 821 const struct inode_operations f2fs_dir_inode_operations = {
 822         .create         = f2fs_create,
 823         .lookup         = f2fs_lookup,
 824         .link           = f2fs_link,
 825         .unlink         = f2fs_unlink,
 826         .symlink        = f2fs_symlink,
 827         .mkdir          = f2fs_mkdir,
 828         .rmdir          = f2fs_rmdir,
 829         .mknod          = f2fs_mknod,
 830         .rename2        = f2fs_rename2,
 831         .tmpfile        = f2fs_tmpfile,
 832         .getattr        = f2fs_getattr,
 833         .setattr        = f2fs_setattr,
 834         .get_acl        = f2fs_get_acl,
 835         .set_acl        = f2fs_set_acl,
 836 #ifdef CONFIG_F2FS_FS_XATTR
 837         .setxattr       = generic_setxattr,
 838         .getxattr       = generic_getxattr,
 839         .listxattr      = f2fs_listxattr,
 840         .removexattr    = generic_removexattr,
 841 #endif
 842 };
 843
 844 const struct inode_operations f2fs_symlink_inode_operations = {
 845         .readlink       = generic_readlink,
 846         .follow_link    = f2fs_follow_link,
 847         .put_link       = page_put_link,
 848         .getattr        = f2fs_getattr,
 849         .setattr        = f2fs_setattr,
 850 #ifdef CONFIG_F2FS_FS_XATTR
 851         .setxattr       = generic_setxattr,
 852         .getxattr       = generic_getxattr,
 853         .listxattr      = f2fs_listxattr,
 854         .removexattr    = generic_removexattr,
 855 #endif
 856 };
 857
 858 const struct inode_operations f2fs_special_inode_operations = {
 859         .getattr        = f2fs_getattr,
 860         .setattr        = f2fs_setattr,
 861         .get_acl        = f2fs_get_acl,
 862         .set_acl        = f2fs_set_acl,
 863 #ifdef CONFIG_F2FS_FS_XATTR
 864         .setxattr       = generic_setxattr,
 865         .getxattr       = generic_getxattr,
 866         .listxattr      = f2fs_listxattr,
 867         .removexattr    = generic_removexattr,
 868 #endif
 869 };