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
  18 #include "f2fs.h"
  19 #include "node.h"
  20 #include "xattr.h"
  21 #include "acl.h"
  22 #include <trace/events/f2fs.h>
  23
  24 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  25 {
  26         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  27         nid_t ino;
  28         struct inode *inode;
  29         bool nid_free = false;
  30         int err;
  31
  32         inode = new_inode(dir->i_sb);
  33         if (!inode)
  34                 return ERR_PTR(-ENOMEM);
  35
  36         f2fs_lock_op(sbi);
  37         if (!alloc_nid(sbi, &ino)) {
  38                 f2fs_unlock_op(sbi);
  39                 err = -ENOSPC;
  40                 goto fail;
  41         }
  42         f2fs_unlock_op(sbi);
  43
  44         inode_init_owner(inode, dir, mode);
  45
  46         inode->i_ino = ino;
  47         inode->i_blocks = 0;
  48         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
  49         inode->i_generation = sbi->s_next_generation++;
  50
  51         err = insert_inode_locked(inode);
  52         if (err) {
  53                 err = -EINVAL;
  54                 nid_free = true;
  55                 goto out;
  56         }
  57
  58         if (f2fs_may_inline(inode))
  59                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
  60         if (test_opt(sbi, INLINE_DENTRY) && S_ISDIR(inode->i_mode))
  61                 set_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
  62
  63         trace_f2fs_new_inode(inode, 0);
  64         mark_inode_dirty(inode);
  65         return inode;
  66
  67 out:
  68         clear_nlink(inode);
  69         unlock_new_inode(inode);
  70 fail:
  71         trace_f2fs_new_inode(inode, err);
  72         make_bad_inode(inode);
  73         iput(inode);
  74         if (nid_free)
  75                 alloc_nid_failed(sbi, ino);
  76         return ERR_PTR(err);
  77 }
  78
  79 static int is_multimedia_file(const unsigned char *s, const char *sub)
  80 {
  81         size_t slen = strlen(s);
  82         size_t sublen = strlen(sub);
  83
  84         if (sublen > slen)
  85                 return 0;
  86
  87         return !strncasecmp(s + slen - sublen, sub, sublen);
  88 }
  89
  90 /*
  91  * Set multimedia files as cold files for hot/cold data separation
  92  */
  93 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
  94                 const unsigned char *name)
  95 {
  96         int i;
  97         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
  98
  99         int count = le32_to_cpu(sbi->raw_super->extension_count);
 100         for (i = 0; i < count; i++) {
 101                 if (is_multimedia_file(name, extlist[i])) {
 102                         file_set_cold(inode);
 103                         break;
 104                 }
 105         }
 106 }
 107
 108 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 109                                                 bool excl)
 110 {
 111         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 112         struct inode *inode;
 113         nid_t ino = 0;
 114         int err;
 115
 116         f2fs_balance_fs(sbi);
 117
 118         inode = f2fs_new_inode(dir, mode);
 119         if (IS_ERR(inode))
 120                 return PTR_ERR(inode);
 121
 122         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 123                 set_cold_files(sbi, inode, dentry->d_name.name);
 124
 125         inode->i_op = &f2fs_file_inode_operations;
 126         inode->i_fop = &f2fs_file_operations;
 127         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 128         ino = inode->i_ino;
 129
 130         f2fs_lock_op(sbi);
 131         err = f2fs_add_link(dentry, inode);
 132         if (err)
 133                 goto out;
 134         f2fs_unlock_op(sbi);
 135
 136         alloc_nid_done(sbi, ino);
 137
 138         stat_inc_inline_inode(inode);
 139         d_instantiate(dentry, inode);
 140         unlock_new_inode(inode);
 141
 142         if (IS_DIRSYNC(dir))
 143                 f2fs_sync_fs(sbi->sb, 1);
 144         return 0;
 145 out:
 146         handle_failed_inode(inode);
 147         return err;
 148 }
 149
 150 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 151                 struct dentry *dentry)
 152 {
 153         struct inode *inode = old_dentry->d_inode;
 154         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 155         int err;
 156
 157         f2fs_balance_fs(sbi);
 158
 159         inode->i_ctime = CURRENT_TIME;
 160         ihold(inode);
 161
 162         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 163         f2fs_lock_op(sbi);
 164         err = f2fs_add_link(dentry, inode);
 165         if (err)
 166                 goto out;
 167         f2fs_unlock_op(sbi);
 168
 169         d_instantiate(dentry, inode);
 170
 171         if (IS_DIRSYNC(dir))
 172                 f2fs_sync_fs(sbi->sb, 1);
 173         return 0;
 174 out:
 175         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 176         iput(inode);
 177         f2fs_unlock_op(sbi);
 178         return err;
 179 }
 180
 181 struct dentry *f2fs_get_parent(struct dentry *child)
 182 {
 183         struct qstr dotdot = QSTR_INIT("..", 2);
 184         unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
 185         if (!ino)
 186                 return ERR_PTR(-ENOENT);
 187         return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
 188 }
 189
 190 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 191 {
 192         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 193         struct qstr dot = QSTR_INIT(".", 1);
 194         struct qstr dotdot = QSTR_INIT("..", 2);
 195         struct f2fs_dir_entry *de;
 196         struct page *page;
 197         int err = 0;
 198
 199         f2fs_lock_op(sbi);
 200
 201         de = f2fs_find_entry(dir, &dot, &page);
 202         if (de) {
 203                 f2fs_dentry_kunmap(dir, page);
 204                 f2fs_put_page(page, 0);
 205         } else {
 206                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 207                 if (err)
 208                         goto out;
 209         }
 210
 211         de = f2fs_find_entry(dir, &dotdot, &page);
 212         if (de) {
 213                 f2fs_dentry_kunmap(dir, page);
 214                 f2fs_put_page(page, 0);
 215         } else {
 216                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 217         }
 218 out:
 219         if (!err) {
 220                 clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS);
 221                 mark_inode_dirty(dir);
 222         }
 223
 224         f2fs_unlock_op(sbi);
 225         return err;
 226 }
 227
 228 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 229                 unsigned int flags)
 230 {
 231         struct inode *inode = NULL;
 232         struct f2fs_dir_entry *de;
 233         struct page *page;
 234
 235         if (dentry->d_name.len > F2FS_NAME_LEN)
 236                 return ERR_PTR(-ENAMETOOLONG);
 237
 238         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 239         if (de) {
 240                 nid_t ino = le32_to_cpu(de->ino);
 241                 f2fs_dentry_kunmap(dir, page);
 242                 f2fs_put_page(page, 0);
 243
 244                 inode = f2fs_iget(dir->i_sb, ino);
 245                 if (IS_ERR(inode))
 246                         return ERR_CAST(inode);
 247
 248                 if (f2fs_has_inline_dots(inode)) {
 249                         int err;
 250
 251                         err = __recover_dot_dentries(inode, dir->i_ino);
 252                         if (err) {
 253                                 iget_failed(inode);
 254                                 return ERR_PTR(err);
 255                         }
 256                 }
 257         }
 258
 259         return d_splice_alias(inode, dentry);
 260 }
 261
 262 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 263 {
 264         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 265         struct inode *inode = dentry->d_inode;
 266         struct f2fs_dir_entry *de;
 267         struct page *page;
 268         int err = -ENOENT;
 269
 270         trace_f2fs_unlink_enter(dir, dentry);
 271         f2fs_balance_fs(sbi);
 272
 273         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 274         if (!de)
 275                 goto fail;
 276
 277         f2fs_lock_op(sbi);
 278         err = acquire_orphan_inode(sbi);
 279         if (err) {
 280                 f2fs_unlock_op(sbi);
 281                 f2fs_dentry_kunmap(dir, page);
 282                 f2fs_put_page(page, 0);
 283                 goto fail;
 284         }
 285         f2fs_delete_entry(de, page, dir, inode);
 286         f2fs_unlock_op(sbi);
 287
 288         /* In order to evict this inode, we set it dirty */
 289         mark_inode_dirty(inode);
 290
 291         if (IS_DIRSYNC(dir))
 292                 f2fs_sync_fs(sbi->sb, 1);
 293 fail:
 294         trace_f2fs_unlink_exit(inode, err);
 295         return err;
 296 }
 297
 298 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 299                                         const char *symname)
 300 {
 301         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 302         struct inode *inode;
 303         size_t symlen = strlen(symname) + 1;
 304         int err;
 305
 306         f2fs_balance_fs(sbi);
 307
 308         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 309         if (IS_ERR(inode))
 310                 return PTR_ERR(inode);
 311
 312         inode->i_op = &f2fs_symlink_inode_operations;
 313         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 314
 315         f2fs_lock_op(sbi);
 316         err = f2fs_add_link(dentry, inode);
 317         if (err)
 318                 goto out;
 319         f2fs_unlock_op(sbi);
 320
 321         err = page_symlink(inode, symname, symlen);
 322         alloc_nid_done(sbi, inode->i_ino);
 323
 324         d_instantiate(dentry, inode);
 325         unlock_new_inode(inode);
 326
 327         /*
 328          * Let's flush symlink data in order to avoid broken symlink as much as
 329          * possible. Nevertheless, fsyncing is the best way, but there is no
 330          * way to get a file descriptor in order to flush that.
 331          *
 332          * Note that, it needs to do dir->fsync to make this recoverable.
 333          * If the symlink path is stored into inline_data, there is no
 334          * performance regression.
 335          */
 336         filemap_write_and_wait_range(inode->i_mapping, 0, symlen - 1);
 337
 338         if (IS_DIRSYNC(dir))
 339                 f2fs_sync_fs(sbi->sb, 1);
 340         return err;
 341 out:
 342         handle_failed_inode(inode);
 343         return err;
 344 }
 345
 346 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 347 {
 348         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 349         struct inode *inode;
 350         int err;
 351
 352         f2fs_balance_fs(sbi);
 353
 354         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 355         if (IS_ERR(inode))
 356                 return PTR_ERR(inode);
 357
 358         inode->i_op = &f2fs_dir_inode_operations;
 359         inode->i_fop = &f2fs_dir_operations;
 360         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 361         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 362
 363         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 364         f2fs_lock_op(sbi);
 365         err = f2fs_add_link(dentry, inode);
 366         if (err)
 367                 goto out_fail;
 368         f2fs_unlock_op(sbi);
 369
 370         stat_inc_inline_dir(inode);
 371         alloc_nid_done(sbi, inode->i_ino);
 372
 373         d_instantiate(dentry, inode);
 374         unlock_new_inode(inode);
 375
 376         if (IS_DIRSYNC(dir))
 377                 f2fs_sync_fs(sbi->sb, 1);
 378         return 0;
 379
 380 out_fail:
 381         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 382         handle_failed_inode(inode);
 383         return err;
 384 }
 385
 386 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 387 {
 388         struct inode *inode = dentry->d_inode;
 389         if (f2fs_empty_dir(inode))
 390                 return f2fs_unlink(dir, dentry);
 391         return -ENOTEMPTY;
 392 }
 393
 394 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 395                                 umode_t mode, dev_t rdev)
 396 {
 397         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 398         struct inode *inode;
 399         int err = 0;
 400
 401         if (!new_valid_dev(rdev))
 402                 return -EINVAL;
 403
 404         f2fs_balance_fs(sbi);
 405
 406         inode = f2fs_new_inode(dir, mode);
 407         if (IS_ERR(inode))
 408                 return PTR_ERR(inode);
 409
 410         init_special_inode(inode, inode->i_mode, rdev);
 411         inode->i_op = &f2fs_special_inode_operations;
 412
 413         f2fs_lock_op(sbi);
 414         err = f2fs_add_link(dentry, inode);
 415         if (err)
 416                 goto out;
 417         f2fs_unlock_op(sbi);
 418
 419         alloc_nid_done(sbi, inode->i_ino);
 420
 421         d_instantiate(dentry, inode);
 422         unlock_new_inode(inode);
 423
 424         if (IS_DIRSYNC(dir))
 425                 f2fs_sync_fs(sbi->sb, 1);
 426         return 0;
 427 out:
 428         handle_failed_inode(inode);
 429         return err;
 430 }
 431
 432 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 433                         struct inode *new_dir, struct dentry *new_dentry)
 434 {
 435         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 436         struct inode *old_inode = old_dentry->d_inode;
 437         struct inode *new_inode = new_dentry->d_inode;
 438         struct page *old_dir_page;
 439         struct page *old_page, *new_page;
 440         struct f2fs_dir_entry *old_dir_entry = NULL;
 441         struct f2fs_dir_entry *old_entry;
 442         struct f2fs_dir_entry *new_entry;
 443         int err = -ENOENT;
 444
 445         f2fs_balance_fs(sbi);
 446
 447         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 448         if (!old_entry)
 449                 goto out;
 450
 451         if (S_ISDIR(old_inode->i_mode)) {
 452                 err = -EIO;
 453                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 454                 if (!old_dir_entry)
 455                         goto out_old;
 456         }
 457
 458         if (new_inode) {
 459
 460                 err = -ENOTEMPTY;
 461                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 462                         goto out_dir;
 463
 464                 err = -ENOENT;
 465                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 466                                                 &new_page);
 467                 if (!new_entry)
 468                         goto out_dir;
 469
 470                 f2fs_lock_op(sbi);
 471
 472                 err = acquire_orphan_inode(sbi);
 473                 if (err)
 474                         goto put_out_dir;
 475
 476                 if (update_dent_inode(old_inode, &new_dentry->d_name)) {
 477                         release_orphan_inode(sbi);
 478                         goto put_out_dir;
 479                 }
 480
 481                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 482
 483                 new_inode->i_ctime = CURRENT_TIME;
 484                 down_write(&F2FS_I(new_inode)->i_sem);
 485                 if (old_dir_entry)
 486                         drop_nlink(new_inode);
 487                 drop_nlink(new_inode);
 488                 up_write(&F2FS_I(new_inode)->i_sem);
 489
 490                 mark_inode_dirty(new_inode);
 491
 492                 if (!new_inode->i_nlink)
 493                         add_orphan_inode(sbi, new_inode->i_ino);
 494                 else
 495                         release_orphan_inode(sbi);
 496
 497                 update_inode_page(old_inode);
 498                 update_inode_page(new_inode);
 499         } else {
 500                 f2fs_lock_op(sbi);
 501
 502                 err = f2fs_add_link(new_dentry, old_inode);
 503                 if (err) {
 504                         f2fs_unlock_op(sbi);
 505                         goto out_dir;
 506                 }
 507
 508                 if (old_dir_entry) {
 509                         inc_nlink(new_dir);
 510                         update_inode_page(new_dir);
 511                 }
 512         }
 513
 514         down_write(&F2FS_I(old_inode)->i_sem);
 515         file_lost_pino(old_inode);
 516         up_write(&F2FS_I(old_inode)->i_sem);
 517
 518         old_inode->i_ctime = CURRENT_TIME;
 519         mark_inode_dirty(old_inode);
 520
 521         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 522
 523         if (old_dir_entry) {
 524                 if (old_dir != new_dir) {
 525                         f2fs_set_link(old_inode, old_dir_entry,
 526                                                 old_dir_page, new_dir);
 527                         update_inode_page(old_inode);
 528                 } else {
 529                         f2fs_dentry_kunmap(old_inode, old_dir_page);
 530                         f2fs_put_page(old_dir_page, 0);
 531                 }
 532                 drop_nlink(old_dir);
 533                 mark_inode_dirty(old_dir);
 534                 update_inode_page(old_dir);
 535         }
 536
 537         f2fs_unlock_op(sbi);
 538
 539         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 540                 f2fs_sync_fs(sbi->sb, 1);
 541         return 0;
 542
 543 put_out_dir:
 544         f2fs_unlock_op(sbi);
 545         f2fs_dentry_kunmap(new_dir, new_page);
 546         f2fs_put_page(new_page, 0);
 547 out_dir:
 548         if (old_dir_entry) {
 549                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 550                 f2fs_put_page(old_dir_page, 0);
 551         }
 552 out_old:
 553         f2fs_dentry_kunmap(old_dir, old_page);
 554         f2fs_put_page(old_page, 0);
 555 out:
 556         return err;
 557 }
 558
 559 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 560                              struct inode *new_dir, struct dentry *new_dentry)
 561 {
 562         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 563         struct inode *old_inode = old_dentry->d_inode;
 564         struct inode *new_inode = new_dentry->d_inode;
 565         struct page *old_dir_page, *new_dir_page;
 566         struct page *old_page, *new_page;
 567         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
 568         struct f2fs_dir_entry *old_entry, *new_entry;
 569         int old_nlink = 0, new_nlink = 0;
 570         int err = -ENOENT;
 571
 572         f2fs_balance_fs(sbi);
 573
 574         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 575         if (!old_entry)
 576                 goto out;
 577
 578         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
 579         if (!new_entry)
 580                 goto out_old;
 581
 582         /* prepare for updating ".." directory entry info later */
 583         if (old_dir != new_dir) {
 584                 if (S_ISDIR(old_inode->i_mode)) {
 585                         err = -EIO;
 586                         old_dir_entry = f2fs_parent_dir(old_inode,
 587                                                         &old_dir_page);
 588                         if (!old_dir_entry)
 589                                 goto out_new;
 590                 }
 591
 592                 if (S_ISDIR(new_inode->i_mode)) {
 593                         err = -EIO;
 594                         new_dir_entry = f2fs_parent_dir(new_inode,
 595                                                         &new_dir_page);
 596                         if (!new_dir_entry)
 597                                 goto out_old_dir;
 598                 }
 599         }
 600
 601         /*
 602          * If cross rename between file and directory those are not
 603          * in the same directory, we will inc nlink of file's parent
 604          * later, so we should check upper boundary of its nlink.
 605          */
 606         if ((!old_dir_entry || !new_dir_entry) &&
 607                                 old_dir_entry != new_dir_entry) {
 608                 old_nlink = old_dir_entry ? -1 : 1;
 609                 new_nlink = -old_nlink;
 610                 err = -EMLINK;
 611                 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
 612                         (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
 613                         goto out_new_dir;
 614         }
 615
 616         f2fs_lock_op(sbi);
 617
 618         err = update_dent_inode(old_inode, &new_dentry->d_name);
 619         if (err)
 620                 goto out_unlock;
 621
 622         err = update_dent_inode(new_inode, &old_dentry->d_name);
 623         if (err)
 624                 goto out_undo;
 625
 626         /* update ".." directory entry info of old dentry */
 627         if (old_dir_entry)
 628                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
 629
 630         /* update ".." directory entry info of new dentry */
 631         if (new_dir_entry)
 632                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
 633
 634         /* update directory entry info of old dir inode */
 635         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
 636
 637         down_write(&F2FS_I(old_inode)->i_sem);
 638         file_lost_pino(old_inode);
 639         up_write(&F2FS_I(old_inode)->i_sem);
 640
 641         update_inode_page(old_inode);
 642
 643         old_dir->i_ctime = CURRENT_TIME;
 644         if (old_nlink) {
 645                 down_write(&F2FS_I(old_dir)->i_sem);
 646                 if (old_nlink < 0)
 647                         drop_nlink(old_dir);
 648                 else
 649                         inc_nlink(old_dir);
 650                 up_write(&F2FS_I(old_dir)->i_sem);
 651         }
 652         mark_inode_dirty(old_dir);
 653         update_inode_page(old_dir);
 654
 655         /* update directory entry info of new dir inode */
 656         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 657
 658         down_write(&F2FS_I(new_inode)->i_sem);
 659         file_lost_pino(new_inode);
 660         up_write(&F2FS_I(new_inode)->i_sem);
 661
 662         update_inode_page(new_inode);
 663
 664         new_dir->i_ctime = CURRENT_TIME;
 665         if (new_nlink) {
 666                 down_write(&F2FS_I(new_dir)->i_sem);
 667                 if (new_nlink < 0)
 668                         drop_nlink(new_dir);
 669                 else
 670                         inc_nlink(new_dir);
 671                 up_write(&F2FS_I(new_dir)->i_sem);
 672         }
 673         mark_inode_dirty(new_dir);
 674         update_inode_page(new_dir);
 675
 676         f2fs_unlock_op(sbi);
 677
 678         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 679                 f2fs_sync_fs(sbi->sb, 1);
 680         return 0;
 681 out_undo:
 682         /* Still we may fail to recover name info of f2fs_inode here */
 683         update_dent_inode(old_inode, &old_dentry->d_name);
 684 out_unlock:
 685         f2fs_unlock_op(sbi);
 686 out_new_dir:
 687         if (new_dir_entry) {
 688                 f2fs_dentry_kunmap(new_inode, new_dir_page);
 689                 f2fs_put_page(new_dir_page, 0);
 690         }
 691 out_old_dir:
 692         if (old_dir_entry) {
 693                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 694                 f2fs_put_page(old_dir_page, 0);
 695         }
 696 out_new:
 697         f2fs_dentry_kunmap(new_dir, new_page);
 698         f2fs_put_page(new_page, 0);
 699 out_old:
 700         f2fs_dentry_kunmap(old_dir, old_page);
 701         f2fs_put_page(old_page, 0);
 702 out:
 703         return err;
 704 }
 705
 706 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
 707                         struct inode *new_dir, struct dentry *new_dentry,
 708                         unsigned int flags)
 709 {
 710         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
 711                 return -EINVAL;
 712
 713         if (flags & RENAME_EXCHANGE) {
 714                 return f2fs_cross_rename(old_dir, old_dentry,
 715                                          new_dir, new_dentry);
 716         }
 717         /*
 718          * VFS has already handled the new dentry existence case,
 719          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
 720          */
 721         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry);
 722 }
 723
 724 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 725 {
 726         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 727         struct inode *inode;
 728         int err;
 729
 730         inode = f2fs_new_inode(dir, mode);
 731         if (IS_ERR(inode))
 732                 return PTR_ERR(inode);
 733
 734         inode->i_op = &f2fs_file_inode_operations;
 735         inode->i_fop = &f2fs_file_operations;
 736         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 737
 738         f2fs_lock_op(sbi);
 739         err = acquire_orphan_inode(sbi);
 740         if (err)
 741                 goto out;
 742
 743         err = f2fs_do_tmpfile(inode, dir);
 744         if (err)
 745                 goto release_out;
 746
 747         /*
 748          * add this non-linked tmpfile to orphan list, in this way we could
 749          * remove all unused data of tmpfile after abnormal power-off.
 750          */
 751         add_orphan_inode(sbi, inode->i_ino);
 752         f2fs_unlock_op(sbi);
 753
 754         alloc_nid_done(sbi, inode->i_ino);
 755
 756         stat_inc_inline_inode(inode);
 757         d_tmpfile(dentry, inode);
 758         unlock_new_inode(inode);
 759         return 0;
 760
 761 release_out:
 762         release_orphan_inode(sbi);
 763 out:
 764         handle_failed_inode(inode);
 765         return err;
 766 }
 767
 768 const struct inode_operations f2fs_dir_inode_operations = {
 769         .create         = f2fs_create,
 770         .lookup         = f2fs_lookup,
 771         .link           = f2fs_link,
 772         .unlink         = f2fs_unlink,
 773         .symlink        = f2fs_symlink,
 774         .mkdir          = f2fs_mkdir,
 775         .rmdir          = f2fs_rmdir,
 776         .mknod          = f2fs_mknod,
 777         .rename2        = f2fs_rename2,
 778         .tmpfile        = f2fs_tmpfile,
 779         .getattr        = f2fs_getattr,
 780         .setattr        = f2fs_setattr,
 781         .get_acl        = f2fs_get_acl,
 782         .set_acl        = f2fs_set_acl,
 783 #ifdef CONFIG_F2FS_FS_XATTR
 784         .setxattr       = generic_setxattr,
 785         .getxattr       = generic_getxattr,
 786         .listxattr      = f2fs_listxattr,
 787         .removexattr    = generic_removexattr,
 788 #endif
 789 };
 790
 791 const struct inode_operations f2fs_symlink_inode_operations = {
 792         .readlink       = generic_readlink,
 793         .follow_link    = page_follow_link_light,
 794         .put_link       = page_put_link,
 795         .getattr        = f2fs_getattr,
 796         .setattr        = f2fs_setattr,
 797 #ifdef CONFIG_F2FS_FS_XATTR
 798         .setxattr       = generic_setxattr,
 799         .getxattr       = generic_getxattr,
 800         .listxattr      = f2fs_listxattr,
 801         .removexattr    = generic_removexattr,
 802 #endif
 803 };
 804
 805 const struct inode_operations f2fs_special_inode_operations = {
 806         .getattr        = f2fs_getattr,
 807         .setattr        = f2fs_setattr,
 808         .get_acl        = f2fs_get_acl,
 809         .set_acl        = f2fs_set_acl,
 810 #ifdef CONFIG_F2FS_FS_XATTR
 811         .setxattr       = generic_setxattr,
 812         .getxattr       = generic_getxattr,
 813         .listxattr      = f2fs_listxattr,
 814         .removexattr    = generic_removexattr,
 815 #endif
 816 };