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 (!alloc_nid(sbi, &ino)) {
  41                 f2fs_unlock_op(sbi);
  42                 err = -ENOSPC;
  43                 goto fail;
  44         }
  45         f2fs_unlock_op(sbi);
  46
  47         nid_free = true;
  48
  49         inode_init_owner(inode, dir, mode);
  50
  51         inode->i_ino = ino;
  52         inode->i_blocks = 0;
  53         inode->i_mtime = inode->i_atime = inode->i_ctime =
  54                         F2FS_I(inode)->i_crtime = current_time(inode);
  55         inode->i_generation = sbi->s_next_generation++;
  56
  57         err = insert_inode_locked(inode);
  58         if (err) {
  59                 err = -EINVAL;
  60                 goto fail;
  61         }
  62
  63         if (f2fs_sb_has_project_quota(sbi->sb) &&
  64                 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
  65                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  66         else
  67                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  68                                                         F2FS_DEF_PROJID);
  69
  70         err = dquot_initialize(inode);
  71         if (err)
  72                 goto fail_drop;
  73
  74         err = dquot_alloc_inode(inode);
  75         if (err)
  76                 goto fail_drop;
  77
  78         set_inode_flag(inode, FI_NEW_INODE);
  79
  80         /* If the directory encrypted, then we should encrypt the inode. */
  81         if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
  82                 f2fs_set_encrypted_inode(inode);
  83
  84         if (f2fs_sb_has_extra_attr(sbi->sb)) {
  85                 set_inode_flag(inode, FI_EXTRA_ATTR);
  86                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  87         }
  88
  89         if (test_opt(sbi, INLINE_XATTR))
  90                 set_inode_flag(inode, FI_INLINE_XATTR);
  91
  92         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  93                 set_inode_flag(inode, FI_INLINE_DATA);
  94         if (f2fs_may_inline_dentry(inode))
  95                 set_inode_flag(inode, FI_INLINE_DENTRY);
  96
  97         if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
  98                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
  99                 if (f2fs_has_inline_xattr(inode))
 100                         xattr_size = sbi->inline_xattr_size;
 101                 /* Otherwise, will be 0 */
 102         } else if (f2fs_has_inline_xattr(inode) ||
 103                                 f2fs_has_inline_dentry(inode)) {
 104                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 105         }
 106         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 107
 108         f2fs_init_extent_tree(inode, NULL);
 109
 110         stat_inc_inline_xattr(inode);
 111         stat_inc_inline_inode(inode);
 112         stat_inc_inline_dir(inode);
 113
 114         F2FS_I(inode)->i_flags =
 115                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 116
 117         if (S_ISDIR(inode->i_mode))
 118                 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
 119
 120         if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
 121                 set_inode_flag(inode, FI_PROJ_INHERIT);
 122
 123         trace_f2fs_new_inode(inode, 0);
 124         return inode;
 125
 126 fail:
 127         trace_f2fs_new_inode(inode, err);
 128         make_bad_inode(inode);
 129         if (nid_free)
 130                 set_inode_flag(inode, FI_FREE_NID);
 131         iput(inode);
 132         return ERR_PTR(err);
 133 fail_drop:
 134         trace_f2fs_new_inode(inode, err);
 135         dquot_drop(inode);
 136         inode->i_flags |= S_NOQUOTA;
 137         if (nid_free)
 138                 set_inode_flag(inode, FI_FREE_NID);
 139         clear_nlink(inode);
 140         unlock_new_inode(inode);
 141         iput(inode);
 142         return ERR_PTR(err);
 143 }
 144
 145 static int is_multimedia_file(const unsigned char *s, const char *sub)
 146 {
 147         size_t slen = strlen(s);
 148         size_t sublen = strlen(sub);
 149         int i;
 150
 151         /*
 152          * filename format of multimedia file should be defined as:
 153          * "filename + '.' + extension + (optional: '.' + temp extension)".
 154          */
 155         if (slen < sublen + 2)
 156                 return 0;
 157
 158         for (i = 1; i < slen - sublen; i++) {
 159                 if (s[i] != '.')
 160                         continue;
 161                 if (!strncasecmp(s + i + 1, sub, sublen))
 162                         return 1;
 163         }
 164
 165         return 0;
 166 }
 167
 168 /*
 169  * Set multimedia files as cold files for hot/cold data separation
 170  */
 171 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
 172                 const unsigned char *name)
 173 {
 174         int i;
 175         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 176
 177         int count = le32_to_cpu(sbi->raw_super->extension_count);
 178         for (i = 0; i < count; i++) {
 179                 if (is_multimedia_file(name, extlist[i])) {
 180                         file_set_cold(inode);
 181                         break;
 182                 }
 183         }
 184 }
 185
 186 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 187                                                 bool excl)
 188 {
 189         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 190         struct inode *inode;
 191         nid_t ino = 0;
 192         int err;
 193
 194         if (unlikely(f2fs_cp_error(sbi)))
 195                 return -EIO;
 196
 197         err = dquot_initialize(dir);
 198         if (err)
 199                 return err;
 200
 201         inode = f2fs_new_inode(dir, mode);
 202         if (IS_ERR(inode))
 203                 return PTR_ERR(inode);
 204
 205         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 206                 set_cold_files(sbi, inode, dentry->d_name.name);
 207
 208         inode->i_op = &f2fs_file_inode_operations;
 209         inode->i_fop = &f2fs_file_operations;
 210         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 211         ino = inode->i_ino;
 212
 213         f2fs_lock_op(sbi);
 214         err = f2fs_add_link(dentry, inode);
 215         if (err)
 216                 goto out;
 217         f2fs_unlock_op(sbi);
 218
 219         alloc_nid_done(sbi, ino);
 220
 221         d_instantiate(dentry, inode);
 222         unlock_new_inode(inode);
 223
 224         if (IS_DIRSYNC(dir))
 225                 f2fs_sync_fs(sbi->sb, 1);
 226
 227         f2fs_balance_fs(sbi, true);
 228         return 0;
 229 out:
 230         handle_failed_inode(inode);
 231         return err;
 232 }
 233
 234 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 235                 struct dentry *dentry)
 236 {
 237         struct inode *inode = d_inode(old_dentry);
 238         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 239         int err;
 240
 241         if (unlikely(f2fs_cp_error(sbi)))
 242                 return -EIO;
 243
 244         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 245         if (err)
 246                 return err;
 247
 248         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 249                         (!projid_eq(F2FS_I(dir)->i_projid,
 250                         F2FS_I(old_dentry->d_inode)->i_projid)))
 251                 return -EXDEV;
 252
 253         err = dquot_initialize(dir);
 254         if (err)
 255                 return err;
 256
 257         f2fs_balance_fs(sbi, true);
 258
 259         inode->i_ctime = current_time(inode);
 260         ihold(inode);
 261
 262         set_inode_flag(inode, FI_INC_LINK);
 263         f2fs_lock_op(sbi);
 264         err = f2fs_add_link(dentry, inode);
 265         if (err)
 266                 goto out;
 267         f2fs_unlock_op(sbi);
 268
 269         d_instantiate(dentry, inode);
 270
 271         if (IS_DIRSYNC(dir))
 272                 f2fs_sync_fs(sbi->sb, 1);
 273         return 0;
 274 out:
 275         clear_inode_flag(inode, FI_INC_LINK);
 276         iput(inode);
 277         f2fs_unlock_op(sbi);
 278         return err;
 279 }
 280
 281 struct dentry *f2fs_get_parent(struct dentry *child)
 282 {
 283         struct qstr dotdot = QSTR_INIT("..", 2);
 284         struct page *page;
 285         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 286         if (!ino) {
 287                 if (IS_ERR(page))
 288                         return ERR_CAST(page);
 289                 return ERR_PTR(-ENOENT);
 290         }
 291         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 292 }
 293
 294 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 295 {
 296         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 297         struct qstr dot = QSTR_INIT(".", 1);
 298         struct qstr dotdot = QSTR_INIT("..", 2);
 299         struct f2fs_dir_entry *de;
 300         struct page *page;
 301         int err = 0;
 302
 303         if (f2fs_readonly(sbi->sb)) {
 304                 f2fs_msg(sbi->sb, KERN_INFO,
 305                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 306                         "in readonly mountpoint", dir->i_ino, pino);
 307                 return 0;
 308         }
 309
 310         err = dquot_initialize(dir);
 311         if (err)
 312                 return err;
 313
 314         f2fs_balance_fs(sbi, true);
 315
 316         f2fs_lock_op(sbi);
 317
 318         de = f2fs_find_entry(dir, &dot, &page);
 319         if (de) {
 320                 f2fs_dentry_kunmap(dir, page);
 321                 f2fs_put_page(page, 0);
 322         } else if (IS_ERR(page)) {
 323                 err = PTR_ERR(page);
 324                 goto out;
 325         } else {
 326                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 327                 if (err)
 328                         goto out;
 329         }
 330
 331         de = f2fs_find_entry(dir, &dotdot, &page);
 332         if (de) {
 333                 f2fs_dentry_kunmap(dir, page);
 334                 f2fs_put_page(page, 0);
 335         } else if (IS_ERR(page)) {
 336                 err = PTR_ERR(page);
 337         } else {
 338                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 339         }
 340 out:
 341         if (!err)
 342                 clear_inode_flag(dir, FI_INLINE_DOTS);
 343
 344         f2fs_unlock_op(sbi);
 345         return err;
 346 }
 347
 348 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 349                 unsigned int flags)
 350 {
 351         struct inode *inode = NULL;
 352         struct f2fs_dir_entry *de;
 353         struct page *page;
 354         struct dentry *new;
 355         nid_t ino = -1;
 356         int err = 0;
 357         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 358
 359         trace_f2fs_lookup_start(dir, dentry, flags);
 360
 361         err = fscrypt_prepare_lookup(dir, dentry, flags);
 362         if (err)
 363                 goto out;
 364
 365         if (dentry->d_name.len > F2FS_NAME_LEN) {
 366                 err = -ENAMETOOLONG;
 367                 goto out;
 368         }
 369
 370         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 371         if (!de) {
 372                 if (IS_ERR(page)) {
 373                         err = PTR_ERR(page);
 374                         goto out;
 375                 }
 376                 goto out_splice;
 377         }
 378
 379         ino = le32_to_cpu(de->ino);
 380         f2fs_dentry_kunmap(dir, page);
 381         f2fs_put_page(page, 0);
 382
 383         inode = f2fs_iget(dir->i_sb, ino);
 384         if (IS_ERR(inode)) {
 385                 err = PTR_ERR(inode);
 386                 goto out;
 387         }
 388
 389         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 390                 err = __recover_dot_dentries(dir, root_ino);
 391                 if (err)
 392                         goto out_iput;
 393         }
 394
 395         if (f2fs_has_inline_dots(inode)) {
 396                 err = __recover_dot_dentries(inode, dir->i_ino);
 397                 if (err)
 398                         goto out_iput;
 399         }
 400         if (f2fs_encrypted_inode(dir) &&
 401             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 402             !fscrypt_has_permitted_context(dir, inode)) {
 403                 f2fs_msg(inode->i_sb, KERN_WARNING,
 404                          "Inconsistent encryption contexts: %lu/%lu",
 405                          dir->i_ino, inode->i_ino);
 406                 err = -EPERM;
 407                 goto out_iput;
 408         }
 409 out_splice:
 410         new = d_splice_alias(inode, dentry);
 411         if (IS_ERR(new))
 412                 err = PTR_ERR(new);
 413         trace_f2fs_lookup_end(dir, dentry, ino, err);
 414         return new;
 415 out_iput:
 416         iput(inode);
 417 out:
 418         trace_f2fs_lookup_end(dir, dentry, ino, err);
 419         return ERR_PTR(err);
 420 }
 421
 422 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 423 {
 424         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 425         struct inode *inode = d_inode(dentry);
 426         struct f2fs_dir_entry *de;
 427         struct page *page;
 428         int err = -ENOENT;
 429
 430         trace_f2fs_unlink_enter(dir, dentry);
 431
 432         if (unlikely(f2fs_cp_error(sbi)))
 433                 return -EIO;
 434
 435         err = dquot_initialize(dir);
 436         if (err)
 437                 return err;
 438         err = dquot_initialize(inode);
 439         if (err)
 440                 return err;
 441
 442         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 443         if (!de) {
 444                 if (IS_ERR(page))
 445                         err = PTR_ERR(page);
 446                 goto fail;
 447         }
 448
 449         f2fs_balance_fs(sbi, true);
 450
 451         f2fs_lock_op(sbi);
 452         err = acquire_orphan_inode(sbi);
 453         if (err) {
 454                 f2fs_unlock_op(sbi);
 455                 f2fs_dentry_kunmap(dir, page);
 456                 f2fs_put_page(page, 0);
 457                 goto fail;
 458         }
 459         f2fs_delete_entry(de, page, dir, inode);
 460         f2fs_unlock_op(sbi);
 461
 462         if (IS_DIRSYNC(dir))
 463                 f2fs_sync_fs(sbi->sb, 1);
 464 fail:
 465         trace_f2fs_unlink_exit(inode, err);
 466         return err;
 467 }
 468
 469 static const char *f2fs_get_link(struct dentry *dentry,
 470                                  struct inode *inode,
 471                                  struct delayed_call *done)
 472 {
 473         const char *link = page_get_link(dentry, inode, done);
 474         if (!IS_ERR(link) && !*link) {
 475                 /* this is broken symlink case */
 476                 do_delayed_call(done);
 477                 clear_delayed_call(done);
 478                 link = ERR_PTR(-ENOENT);
 479         }
 480         return link;
 481 }
 482
 483 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 484                                         const char *symname)
 485 {
 486         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 487         struct inode *inode;
 488         size_t len = strlen(symname);
 489         struct fscrypt_str disk_link;
 490         int err;
 491
 492         if (unlikely(f2fs_cp_error(sbi)))
 493                 return -EIO;
 494
 495         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 496                                       &disk_link);
 497         if (err)
 498                 return err;
 499
 500         err = dquot_initialize(dir);
 501         if (err)
 502                 return err;
 503
 504         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 505         if (IS_ERR(inode))
 506                 return PTR_ERR(inode);
 507
 508         if (IS_ENCRYPTED(inode))
 509                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 510         else
 511                 inode->i_op = &f2fs_symlink_inode_operations;
 512         inode_nohighmem(inode);
 513         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 514
 515         f2fs_lock_op(sbi);
 516         err = f2fs_add_link(dentry, inode);
 517         if (err)
 518                 goto out_handle_failed_inode;
 519         f2fs_unlock_op(sbi);
 520         alloc_nid_done(sbi, inode->i_ino);
 521
 522         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 523         if (err)
 524                 goto err_out;
 525
 526         err = page_symlink(inode, disk_link.name, disk_link.len);
 527
 528 err_out:
 529         d_instantiate(dentry, inode);
 530         unlock_new_inode(inode);
 531
 532         /*
 533          * Let's flush symlink data in order to avoid broken symlink as much as
 534          * possible. Nevertheless, fsyncing is the best way, but there is no
 535          * way to get a file descriptor in order to flush that.
 536          *
 537          * Note that, it needs to do dir->fsync to make this recoverable.
 538          * If the symlink path is stored into inline_data, there is no
 539          * performance regression.
 540          */
 541         if (!err) {
 542                 filemap_write_and_wait_range(inode->i_mapping, 0,
 543                                                         disk_link.len - 1);
 544
 545                 if (IS_DIRSYNC(dir))
 546                         f2fs_sync_fs(sbi->sb, 1);
 547         } else {
 548                 f2fs_unlink(dir, dentry);
 549         }
 550
 551         f2fs_balance_fs(sbi, true);
 552         goto out_free_encrypted_link;
 553
 554 out_handle_failed_inode:
 555         handle_failed_inode(inode);
 556 out_free_encrypted_link:
 557         if (disk_link.name != (unsigned char *)symname)
 558                 kfree(disk_link.name);
 559         return err;
 560 }
 561
 562 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 563 {
 564         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 565         struct inode *inode;
 566         int err;
 567
 568         if (unlikely(f2fs_cp_error(sbi)))
 569                 return -EIO;
 570
 571         err = dquot_initialize(dir);
 572         if (err)
 573                 return err;
 574
 575         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 576         if (IS_ERR(inode))
 577                 return PTR_ERR(inode);
 578
 579         inode->i_op = &f2fs_dir_inode_operations;
 580         inode->i_fop = &f2fs_dir_operations;
 581         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 582         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 583
 584         set_inode_flag(inode, FI_INC_LINK);
 585         f2fs_lock_op(sbi);
 586         err = f2fs_add_link(dentry, inode);
 587         if (err)
 588                 goto out_fail;
 589         f2fs_unlock_op(sbi);
 590
 591         alloc_nid_done(sbi, inode->i_ino);
 592
 593         d_instantiate(dentry, inode);
 594         unlock_new_inode(inode);
 595
 596         if (IS_DIRSYNC(dir))
 597                 f2fs_sync_fs(sbi->sb, 1);
 598
 599         f2fs_balance_fs(sbi, true);
 600         return 0;
 601
 602 out_fail:
 603         clear_inode_flag(inode, FI_INC_LINK);
 604         handle_failed_inode(inode);
 605         return err;
 606 }
 607
 608 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 609 {
 610         struct inode *inode = d_inode(dentry);
 611         if (f2fs_empty_dir(inode))
 612                 return f2fs_unlink(dir, dentry);
 613         return -ENOTEMPTY;
 614 }
 615
 616 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 617                                 umode_t mode, dev_t rdev)
 618 {
 619         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 620         struct inode *inode;
 621         int err = 0;
 622
 623         if (unlikely(f2fs_cp_error(sbi)))
 624                 return -EIO;
 625
 626         err = dquot_initialize(dir);
 627         if (err)
 628                 return err;
 629
 630         inode = f2fs_new_inode(dir, mode);
 631         if (IS_ERR(inode))
 632                 return PTR_ERR(inode);
 633
 634         init_special_inode(inode, inode->i_mode, rdev);
 635         inode->i_op = &f2fs_special_inode_operations;
 636
 637         f2fs_lock_op(sbi);
 638         err = f2fs_add_link(dentry, inode);
 639         if (err)
 640                 goto out;
 641         f2fs_unlock_op(sbi);
 642
 643         alloc_nid_done(sbi, inode->i_ino);
 644
 645         d_instantiate(dentry, inode);
 646         unlock_new_inode(inode);
 647
 648         if (IS_DIRSYNC(dir))
 649                 f2fs_sync_fs(sbi->sb, 1);
 650
 651         f2fs_balance_fs(sbi, true);
 652         return 0;
 653 out:
 654         handle_failed_inode(inode);
 655         return err;
 656 }
 657
 658 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 659                                         umode_t mode, struct inode **whiteout)
 660 {
 661         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 662         struct inode *inode;
 663         int err;
 664
 665         err = dquot_initialize(dir);
 666         if (err)
 667                 return err;
 668
 669         inode = f2fs_new_inode(dir, mode);
 670         if (IS_ERR(inode))
 671                 return PTR_ERR(inode);
 672
 673         if (whiteout) {
 674                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 675                 inode->i_op = &f2fs_special_inode_operations;
 676         } else {
 677                 inode->i_op = &f2fs_file_inode_operations;
 678                 inode->i_fop = &f2fs_file_operations;
 679                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 680         }
 681
 682         f2fs_lock_op(sbi);
 683         err = acquire_orphan_inode(sbi);
 684         if (err)
 685                 goto out;
 686
 687         err = f2fs_do_tmpfile(inode, dir);
 688         if (err)
 689                 goto release_out;
 690
 691         /*
 692          * add this non-linked tmpfile to orphan list, in this way we could
 693          * remove all unused data of tmpfile after abnormal power-off.
 694          */
 695         add_orphan_inode(inode);
 696         alloc_nid_done(sbi, inode->i_ino);
 697
 698         if (whiteout) {
 699                 f2fs_i_links_write(inode, false);
 700                 *whiteout = inode;
 701         } else {
 702                 d_tmpfile(dentry, inode);
 703         }
 704         /* link_count was changed by d_tmpfile as well. */
 705         f2fs_unlock_op(sbi);
 706         unlock_new_inode(inode);
 707
 708         f2fs_balance_fs(sbi, true);
 709         return 0;
 710
 711 release_out:
 712         release_orphan_inode(sbi);
 713 out:
 714         handle_failed_inode(inode);
 715         return err;
 716 }
 717
 718 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 719 {
 720         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 721                 return -EIO;
 722
 723         if (f2fs_encrypted_inode(dir)) {
 724                 int err = fscrypt_get_encryption_info(dir);
 725                 if (err)
 726                         return err;
 727         }
 728
 729         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 730 }
 731
 732 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 733 {
 734         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 735                 return -EIO;
 736
 737         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 738 }
 739
 740 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 741                         struct inode *new_dir, struct dentry *new_dentry,
 742                         unsigned int flags)
 743 {
 744         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 745         struct inode *old_inode = d_inode(old_dentry);
 746         struct inode *new_inode = d_inode(new_dentry);
 747         struct inode *whiteout = NULL;
 748         struct page *old_dir_page;
 749         struct page *old_page, *new_page = NULL;
 750         struct f2fs_dir_entry *old_dir_entry = NULL;
 751         struct f2fs_dir_entry *old_entry;
 752         struct f2fs_dir_entry *new_entry;
 753         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 754         int err = -ENOENT;
 755
 756         if (unlikely(f2fs_cp_error(sbi)))
 757                 return -EIO;
 758
 759         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 760                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 761                         F2FS_I(old_dentry->d_inode)->i_projid)))
 762                 return -EXDEV;
 763
 764         err = dquot_initialize(old_dir);
 765         if (err)
 766                 goto out;
 767
 768         err = dquot_initialize(new_dir);
 769         if (err)
 770                 goto out;
 771
 772         if (new_inode) {
 773                 err = dquot_initialize(new_inode);
 774                 if (err)
 775                         goto out;
 776         }
 777
 778         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 779         if (!old_entry) {
 780                 if (IS_ERR(old_page))
 781                         err = PTR_ERR(old_page);
 782                 goto out;
 783         }
 784
 785         if (S_ISDIR(old_inode->i_mode)) {
 786                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 787                 if (!old_dir_entry) {
 788                         if (IS_ERR(old_dir_page))
 789                                 err = PTR_ERR(old_dir_page);
 790                         goto out_old;
 791                 }
 792         }
 793
 794         if (flags & RENAME_WHITEOUT) {
 795                 err = f2fs_create_whiteout(old_dir, &whiteout);
 796                 if (err)
 797                         goto out_dir;
 798         }
 799
 800         if (new_inode) {
 801
 802                 err = -ENOTEMPTY;
 803                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 804                         goto out_whiteout;
 805
 806                 err = -ENOENT;
 807                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 808                                                 &new_page);
 809                 if (!new_entry) {
 810                         if (IS_ERR(new_page))
 811                                 err = PTR_ERR(new_page);
 812                         goto out_whiteout;
 813                 }
 814
 815                 f2fs_balance_fs(sbi, true);
 816
 817                 f2fs_lock_op(sbi);
 818
 819                 err = acquire_orphan_inode(sbi);
 820                 if (err)
 821                         goto put_out_dir;
 822
 823                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 824
 825                 new_inode->i_ctime = current_time(new_inode);
 826                 down_write(&F2FS_I(new_inode)->i_sem);
 827                 if (old_dir_entry)
 828                         f2fs_i_links_write(new_inode, false);
 829                 f2fs_i_links_write(new_inode, false);
 830                 up_write(&F2FS_I(new_inode)->i_sem);
 831
 832                 if (!new_inode->i_nlink)
 833                         add_orphan_inode(new_inode);
 834                 else
 835                         release_orphan_inode(sbi);
 836         } else {
 837                 f2fs_balance_fs(sbi, true);
 838
 839                 f2fs_lock_op(sbi);
 840
 841                 err = f2fs_add_link(new_dentry, old_inode);
 842                 if (err) {
 843                         f2fs_unlock_op(sbi);
 844                         goto out_whiteout;
 845                 }
 846
 847                 if (old_dir_entry)
 848                         f2fs_i_links_write(new_dir, true);
 849
 850                 /*
 851                  * old entry and new entry can locate in the same inline
 852                  * dentry in inode, when attaching new entry in inline dentry,
 853                  * it could force inline dentry conversion, after that,
 854                  * old_entry and old_page will point to wrong address, in
 855                  * order to avoid this, let's do the check and update here.
 856                  */
 857                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 858                         f2fs_put_page(old_page, 0);
 859                         old_page = NULL;
 860
 861                         old_entry = f2fs_find_entry(old_dir,
 862                                                 &old_dentry->d_name, &old_page);
 863                         if (!old_entry) {
 864                                 err = -ENOENT;
 865                                 if (IS_ERR(old_page))
 866                                         err = PTR_ERR(old_page);
 867                                 f2fs_unlock_op(sbi);
 868                                 goto out_whiteout;
 869                         }
 870                 }
 871         }
 872
 873         down_write(&F2FS_I(old_inode)->i_sem);
 874         if (!old_dir_entry || whiteout)
 875                 file_lost_pino(old_inode);
 876         else
 877                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 878         up_write(&F2FS_I(old_inode)->i_sem);
 879
 880         old_inode->i_ctime = current_time(old_inode);
 881         f2fs_mark_inode_dirty_sync(old_inode, false);
 882
 883         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 884
 885         if (whiteout) {
 886                 whiteout->i_state |= I_LINKABLE;
 887                 set_inode_flag(whiteout, FI_INC_LINK);
 888                 err = f2fs_add_link(old_dentry, whiteout);
 889                 if (err)
 890                         goto put_out_dir;
 891                 whiteout->i_state &= ~I_LINKABLE;
 892                 iput(whiteout);
 893         }
 894
 895         if (old_dir_entry) {
 896                 if (old_dir != new_dir && !whiteout) {
 897                         f2fs_set_link(old_inode, old_dir_entry,
 898                                                 old_dir_page, new_dir);
 899                 } else {
 900                         f2fs_dentry_kunmap(old_inode, old_dir_page);
 901                         f2fs_put_page(old_dir_page, 0);
 902                 }
 903                 f2fs_i_links_write(old_dir, false);
 904         }
 905         add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 906
 907         f2fs_unlock_op(sbi);
 908
 909         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 910                 f2fs_sync_fs(sbi->sb, 1);
 911         return 0;
 912
 913 put_out_dir:
 914         f2fs_unlock_op(sbi);
 915         if (new_page) {
 916                 f2fs_dentry_kunmap(new_dir, new_page);
 917                 f2fs_put_page(new_page, 0);
 918         }
 919 out_whiteout:
 920         if (whiteout)
 921                 iput(whiteout);
 922 out_dir:
 923         if (old_dir_entry) {
 924                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 925                 f2fs_put_page(old_dir_page, 0);
 926         }
 927 out_old:
 928         f2fs_dentry_kunmap(old_dir, old_page);
 929         f2fs_put_page(old_page, 0);
 930 out:
 931         return err;
 932 }
 933
 934 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 935                              struct inode *new_dir, struct dentry *new_dentry)
 936 {
 937         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 938         struct inode *old_inode = d_inode(old_dentry);
 939         struct inode *new_inode = d_inode(new_dentry);
 940         struct page *old_dir_page, *new_dir_page;
 941         struct page *old_page, *new_page;
 942         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
 943         struct f2fs_dir_entry *old_entry, *new_entry;
 944         int old_nlink = 0, new_nlink = 0;
 945         int err = -ENOENT;
 946
 947         if (unlikely(f2fs_cp_error(sbi)))
 948                 return -EIO;
 949
 950         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 951                         !projid_eq(F2FS_I(new_dir)->i_projid,
 952                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
 953             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 954                         !projid_eq(F2FS_I(old_dir)->i_projid,
 955                         F2FS_I(new_dentry->d_inode)->i_projid)))
 956                 return -EXDEV;
 957
 958         err = dquot_initialize(old_dir);
 959         if (err)
 960                 goto out;
 961
 962         err = dquot_initialize(new_dir);
 963         if (err)
 964                 goto out;
 965
 966         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 967         if (!old_entry) {
 968                 if (IS_ERR(old_page))
 969                         err = PTR_ERR(old_page);
 970                 goto out;
 971         }
 972
 973         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
 974         if (!new_entry) {
 975                 if (IS_ERR(new_page))
 976                         err = PTR_ERR(new_page);
 977                 goto out_old;
 978         }
 979
 980         /* prepare for updating ".." directory entry info later */
 981         if (old_dir != new_dir) {
 982                 if (S_ISDIR(old_inode->i_mode)) {
 983                         old_dir_entry = f2fs_parent_dir(old_inode,
 984                                                         &old_dir_page);
 985                         if (!old_dir_entry) {
 986                                 if (IS_ERR(old_dir_page))
 987                                         err = PTR_ERR(old_dir_page);
 988                                 goto out_new;
 989                         }
 990                 }
 991
 992                 if (S_ISDIR(new_inode->i_mode)) {
 993                         new_dir_entry = f2fs_parent_dir(new_inode,
 994                                                         &new_dir_page);
 995                         if (!new_dir_entry) {
 996                                 if (IS_ERR(new_dir_page))
 997                                         err = PTR_ERR(new_dir_page);
 998                                 goto out_old_dir;
 999                         }
1000                 }
1001         }
1002
1003         /*
1004          * If cross rename between file and directory those are not
1005          * in the same directory, we will inc nlink of file's parent
1006          * later, so we should check upper boundary of its nlink.
1007          */
1008         if ((!old_dir_entry || !new_dir_entry) &&
1009                                 old_dir_entry != new_dir_entry) {
1010                 old_nlink = old_dir_entry ? -1 : 1;
1011                 new_nlink = -old_nlink;
1012                 err = -EMLINK;
1013                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1014                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1015                         goto out_new_dir;
1016         }
1017
1018         f2fs_balance_fs(sbi, true);
1019
1020         f2fs_lock_op(sbi);
1021
1022         /* update ".." directory entry info of old dentry */
1023         if (old_dir_entry)
1024                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1025
1026         /* update ".." directory entry info of new dentry */
1027         if (new_dir_entry)
1028                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1029
1030         /* update directory entry info of old dir inode */
1031         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1032
1033         down_write(&F2FS_I(old_inode)->i_sem);
1034         file_lost_pino(old_inode);
1035         up_write(&F2FS_I(old_inode)->i_sem);
1036
1037         old_dir->i_ctime = current_time(old_dir);
1038         if (old_nlink) {
1039                 down_write(&F2FS_I(old_dir)->i_sem);
1040                 f2fs_i_links_write(old_dir, old_nlink > 0);
1041                 up_write(&F2FS_I(old_dir)->i_sem);
1042         }
1043         f2fs_mark_inode_dirty_sync(old_dir, false);
1044
1045         /* update directory entry info of new dir inode */
1046         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1047
1048         down_write(&F2FS_I(new_inode)->i_sem);
1049         file_lost_pino(new_inode);
1050         up_write(&F2FS_I(new_inode)->i_sem);
1051
1052         new_dir->i_ctime = current_time(new_dir);
1053         if (new_nlink) {
1054                 down_write(&F2FS_I(new_dir)->i_sem);
1055                 f2fs_i_links_write(new_dir, new_nlink > 0);
1056                 up_write(&F2FS_I(new_dir)->i_sem);
1057         }
1058         f2fs_mark_inode_dirty_sync(new_dir, false);
1059
1060         add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1061         add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1062
1063         f2fs_unlock_op(sbi);
1064
1065         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1066                 f2fs_sync_fs(sbi->sb, 1);
1067         return 0;
1068 out_new_dir:
1069         if (new_dir_entry) {
1070                 f2fs_dentry_kunmap(new_inode, new_dir_page);
1071                 f2fs_put_page(new_dir_page, 0);
1072         }
1073 out_old_dir:
1074         if (old_dir_entry) {
1075                 f2fs_dentry_kunmap(old_inode, old_dir_page);
1076                 f2fs_put_page(old_dir_page, 0);
1077         }
1078 out_new:
1079         f2fs_dentry_kunmap(new_dir, new_page);
1080         f2fs_put_page(new_page, 0);
1081 out_old:
1082         f2fs_dentry_kunmap(old_dir, old_page);
1083         f2fs_put_page(old_page, 0);
1084 out:
1085         return err;
1086 }
1087
1088 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1089                         struct inode *new_dir, struct dentry *new_dentry,
1090                         unsigned int flags)
1091 {
1092         int err;
1093
1094         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1095                 return -EINVAL;
1096
1097         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1098                                      flags);
1099         if (err)
1100                 return err;
1101
1102         if (flags & RENAME_EXCHANGE) {
1103                 return f2fs_cross_rename(old_dir, old_dentry,
1104                                          new_dir, new_dentry);
1105         }
1106         /*
1107          * VFS has already handled the new dentry existence case,
1108          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1109          */
1110         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1111 }
1112
1113 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1114                                            struct inode *inode,
1115                                            struct delayed_call *done)
1116 {
1117         struct page *page;
1118         const char *target;
1119
1120         if (!dentry)
1121                 return ERR_PTR(-ECHILD);
1122
1123         page = read_mapping_page(inode->i_mapping, 0, NULL);
1124         if (IS_ERR(page))
1125                 return ERR_CAST(page);
1126
1127         target = fscrypt_get_symlink(inode, page_address(page),
1128                                      inode->i_sb->s_blocksize, done);
1129         put_page(page);
1130         return target;
1131 }
1132
1133 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1134         .get_link       = f2fs_encrypted_get_link,
1135         .getattr        = f2fs_getattr,
1136         .setattr        = f2fs_setattr,
1137 #ifdef CONFIG_F2FS_FS_XATTR
1138         .listxattr      = f2fs_listxattr,
1139 #endif
1140 };
1141
1142 const struct inode_operations f2fs_dir_inode_operations = {
1143         .create         = f2fs_create,
1144         .lookup         = f2fs_lookup,
1145         .link           = f2fs_link,
1146         .unlink         = f2fs_unlink,
1147         .symlink        = f2fs_symlink,
1148         .mkdir          = f2fs_mkdir,
1149         .rmdir          = f2fs_rmdir,
1150         .mknod          = f2fs_mknod,
1151         .rename         = f2fs_rename2,
1152         .tmpfile        = f2fs_tmpfile,
1153         .getattr        = f2fs_getattr,
1154         .setattr        = f2fs_setattr,
1155         .get_acl        = f2fs_get_acl,
1156         .set_acl        = f2fs_set_acl,
1157 #ifdef CONFIG_F2FS_FS_XATTR
1158         .listxattr      = f2fs_listxattr,
1159 #endif
1160 };
1161
1162 const struct inode_operations f2fs_symlink_inode_operations = {
1163         .get_link       = f2fs_get_link,
1164         .getattr        = f2fs_getattr,
1165         .setattr        = f2fs_setattr,
1166 #ifdef CONFIG_F2FS_FS_XATTR
1167         .listxattr      = f2fs_listxattr,
1168 #endif
1169 };
1170
1171 const struct inode_operations f2fs_special_inode_operations = {
1172         .getattr        = f2fs_getattr,
1173         .setattr        = f2fs_setattr,
1174         .get_acl        = f2fs_get_acl,
1175         .set_acl        = f2fs_set_acl,
1176 #ifdef CONFIG_F2FS_FS_XATTR
1177         .listxattr      = f2fs_listxattr,
1178 #endif
1179 };