fs/f2fs/namei.c

   1 /*
   2  * fs/f2fs/namei.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13 #include <linux/pagemap.h>
  14 #include <linux/sched.h>
  15 #include <linux/ctype.h>
  16 #include <linux/dcache.h>
  17 #include <linux/namei.h>
  18 #include <linux/quotaops.h>
  19
  20 #include "f2fs.h"
  21 #include "node.h"
  22 #include "xattr.h"
  23 #include "acl.h"
  24 #include <trace/events/f2fs.h>
  25
  26 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  27 {
  28         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  29         nid_t ino;
  30         struct inode *inode;
  31         bool nid_free = false;
  32         int xattr_size = 0;
  33         int err;
  34
  35         inode = new_inode(dir->i_sb);
  36         if (!inode)
  37                 return ERR_PTR(-ENOMEM);
  38
  39         f2fs_lock_op(sbi);
  40         if (!f2fs_alloc_nid(sbi, &ino)) {
  41                 f2fs_unlock_op(sbi);
  42                 err = -ENOSPC;
  43                 goto fail;
  44         }
  45         f2fs_unlock_op(sbi);
  46
  47         nid_free = true;
  48
  49         inode_init_owner(inode, dir, mode);
  50
  51         inode->i_ino = ino;
  52         inode->i_blocks = 0;
  53         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
  54         F2FS_I(inode)->i_crtime = inode->i_mtime;
  55         inode->i_generation = sbi->s_next_generation++;
  56
  57         if (S_ISDIR(inode->i_mode))
  58                 F2FS_I(inode)->i_current_depth = 1;
  59
  60         err = insert_inode_locked(inode);
  61         if (err) {
  62                 err = -EINVAL;
  63                 goto fail;
  64         }
  65
  66         if (f2fs_sb_has_project_quota(sbi->sb) &&
  67                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
  68                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  69         else
  70                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  71                                                         F2FS_DEF_PROJID);
  72
  73         err = dquot_initialize(inode);
  74         if (err)
  75                 goto fail_drop;
  76
  77         err = dquot_alloc_inode(inode);
  78         if (err)
  79                 goto fail_drop;
  80
  81         set_inode_flag(inode, FI_NEW_INODE);
  82
  83         /* If the directory encrypted, then we should encrypt the inode. */
  84         if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
  85                                 f2fs_may_encrypt(inode))
  86                 f2fs_set_encrypted_inode(inode);
  87
  88         if (f2fs_sb_has_extra_attr(sbi->sb)) {
  89                 set_inode_flag(inode, FI_EXTRA_ATTR);
  90                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  91         }
  92
  93         if (test_opt(sbi, INLINE_XATTR))
  94                 set_inode_flag(inode, FI_INLINE_XATTR);
  95
  96         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  97                 set_inode_flag(inode, FI_INLINE_DATA);
  98         if (f2fs_may_inline_dentry(inode))
  99                 set_inode_flag(inode, FI_INLINE_DENTRY);
 100
 101         if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
 102                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
 103                 if (f2fs_has_inline_xattr(inode))
 104                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
 105                 /* Otherwise, will be 0 */
 106         } else if (f2fs_has_inline_xattr(inode) ||
 107                                 f2fs_has_inline_dentry(inode)) {
 108                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 109         }
 110         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 111
 112         f2fs_init_extent_tree(inode, NULL);
 113
 114         stat_inc_inline_xattr(inode);
 115         stat_inc_inline_inode(inode);
 116         stat_inc_inline_dir(inode);
 117
 118         F2FS_I(inode)->i_flags =
 119                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 120
 121         if (S_ISDIR(inode->i_mode))
 122                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
 123
 124         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
 125                 set_inode_flag(inode, FI_PROJ_INHERIT);
 126
 127         trace_f2fs_new_inode(inode, 0);
 128         return inode;
 129
 130 fail:
 131         trace_f2fs_new_inode(inode, err);
 132         make_bad_inode(inode);
 133         if (nid_free)
 134                 set_inode_flag(inode, FI_FREE_NID);
 135         iput(inode);
 136         return ERR_PTR(err);
 137 fail_drop:
 138         trace_f2fs_new_inode(inode, err);
 139         dquot_drop(inode);
 140         inode->i_flags |= S_NOQUOTA;
 141         if (nid_free)
 142                 set_inode_flag(inode, FI_FREE_NID);
 143         clear_nlink(inode);
 144         unlock_new_inode(inode);
 145         iput(inode);
 146         return ERR_PTR(err);
 147 }
 148
 149 static int is_extension_exist(const unsigned char *s, const char *sub)
 150 {
 151         size_t slen = strlen(s);
 152         size_t sublen = strlen(sub);
 153         int i;
 154
 155         /*
 156          * filename format of multimedia file should be defined as:
 157          * "filename + '.' + extension + (optional: '.' + temp extension)".
 158          */
 159         if (slen < sublen + 2)
 160                 return 0;
 161
 162         for (i = 1; i < slen - sublen; i++) {
 163                 if (s[i] != '.')
 164                         continue;
 165                 if (!strncasecmp(s + i + 1, sub, sublen))
 166                         return 1;
 167         }
 168
 169         return 0;
 170 }
 171
 172 /*
 173  * Set multimedia files as cold files for hot/cold data separation
 174  */
 175 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 176                 const unsigned char *name)
 177 {
 178         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 179         int i, cold_count, hot_count;
 180
 181         down_read(&sbi->sb_lock);
 182
 183         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 184         hot_count = sbi->raw_super->hot_ext_count;
 185
 186         for (i = 0; i < cold_count + hot_count; i++) {
 187                 if (!is_extension_exist(name, extlist[i]))
 188                         continue;
 189                 if (i < cold_count)
 190                         file_set_cold(inode);
 191                 else
 192                         file_set_hot(inode);
 193                 break;
 194         }
 195
 196         up_read(&sbi->sb_lock);
 197 }
 198
 199 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 200                                                         bool hot, bool set)
 201 {
 202         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 203         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 204         int hot_count = sbi->raw_super->hot_ext_count;
 205         int total_count = cold_count + hot_count;
 206         int start, count;
 207         int i;
 208
 209         if (set) {
 210                 if (total_count == F2FS_MAX_EXTENSION)
 211                         return -EINVAL;
 212         } else {
 213                 if (!hot && !cold_count)
 214                         return -EINVAL;
 215                 if (hot && !hot_count)
 216                         return -EINVAL;
 217         }
 218
 219         if (hot) {
 220                 start = cold_count;
 221                 count = total_count;
 222         } else {
 223                 start = 0;
 224                 count = cold_count;
 225         }
 226
 227         for (i = start; i < count; i++) {
 228                 if (strcmp(name, extlist[i]))
 229                         continue;
 230
 231                 if (set)
 232                         return -EINVAL;
 233
 234                 memcpy(extlist[i], extlist[i + 1],
 235                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 236                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 237                 if (hot)
 238                         sbi->raw_super->hot_ext_count = hot_count - 1;
 239                 else
 240                         sbi->raw_super->extension_count =
 241                                                 cpu_to_le32(cold_count - 1);
 242                 return 0;
 243         }
 244
 245         if (!set)
 246                 return -EINVAL;
 247
 248         if (hot) {
 249                 memcpy(extlist[count], name, strlen(name));
 250                 sbi->raw_super->hot_ext_count = hot_count + 1;
 251         } else {
 252                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 253
 254                 memcpy(buf, &extlist[cold_count],
 255                                 F2FS_EXTENSION_LEN * hot_count);
 256                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 257                 memcpy(extlist[cold_count], name, strlen(name));
 258                 memcpy(&extlist[cold_count + 1], buf,
 259                                 F2FS_EXTENSION_LEN * hot_count);
 260                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 261         }
 262         return 0;
 263 }
 264
 265 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 266                                                 bool excl)
 267 {
 268         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 269         struct inode *inode;
 270         nid_t ino = 0;
 271         int err;
 272
 273         if (unlikely(f2fs_cp_error(sbi)))
 274                 return -EIO;
 275
 276         err = dquot_initialize(dir);
 277         if (err)
 278                 return err;
 279
 280         inode = f2fs_new_inode(dir, mode);
 281         if (IS_ERR(inode))
 282                 return PTR_ERR(inode);
 283
 284         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 285                 set_file_temperature(sbi, inode, dentry->d_name.name);
 286
 287         inode->i_op = &f2fs_file_inode_operations;
 288         inode->i_fop = &f2fs_file_operations;
 289         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 290         ino = inode->i_ino;
 291
 292         f2fs_lock_op(sbi);
 293         err = f2fs_add_link(dentry, inode);
 294         if (err)
 295                 goto out;
 296         f2fs_unlock_op(sbi);
 297
 298         f2fs_alloc_nid_done(sbi, ino);
 299
 300         d_instantiate_new(dentry, inode);
 301
 302         if (IS_DIRSYNC(dir))
 303                 f2fs_sync_fs(sbi->sb, 1);
 304
 305         f2fs_balance_fs(sbi, true);
 306         return 0;
 307 out:
 308         f2fs_handle_failed_inode(inode);
 309         return err;
 310 }
 311
 312 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 313                 struct dentry *dentry)
 314 {
 315         struct inode *inode = d_inode(old_dentry);
 316         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 317         int err;
 318
 319         if (unlikely(f2fs_cp_error(sbi)))
 320                 return -EIO;
 321
 322         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 323         if (err)
 324                 return err;
 325
 326         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 327                         (!projid_eq(F2FS_I(dir)->i_projid,
 328                         F2FS_I(old_dentry->d_inode)->i_projid)))
 329                 return -EXDEV;
 330
 331         err = dquot_initialize(dir);
 332         if (err)
 333                 return err;
 334
 335         f2fs_balance_fs(sbi, true);
 336
 337         inode->i_ctime = current_time(inode);
 338         ihold(inode);
 339
 340         set_inode_flag(inode, FI_INC_LINK);
 341         f2fs_lock_op(sbi);
 342         err = f2fs_add_link(dentry, inode);
 343         if (err)
 344                 goto out;
 345         f2fs_unlock_op(sbi);
 346
 347         d_instantiate(dentry, inode);
 348
 349         if (IS_DIRSYNC(dir))
 350                 f2fs_sync_fs(sbi->sb, 1);
 351         return 0;
 352 out:
 353         clear_inode_flag(inode, FI_INC_LINK);
 354         iput(inode);
 355         f2fs_unlock_op(sbi);
 356         return err;
 357 }
 358
 359 struct dentry *f2fs_get_parent(struct dentry *child)
 360 {
 361         struct qstr dotdot = QSTR_INIT("..", 2);
 362         struct page *page;
 363         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 364         if (!ino) {
 365                 if (IS_ERR(page))
 366                         return ERR_CAST(page);
 367                 return ERR_PTR(-ENOENT);
 368         }
 369         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 370 }
 371
 372 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 373 {
 374         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 375         struct qstr dot = QSTR_INIT(".", 1);
 376         struct qstr dotdot = QSTR_INIT("..", 2);
 377         struct f2fs_dir_entry *de;
 378         struct page *page;
 379         int err = 0;
 380
 381         if (f2fs_readonly(sbi->sb)) {
 382                 f2fs_msg(sbi->sb, KERN_INFO,
 383                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 384                         "in readonly mountpoint", dir->i_ino, pino);
 385                 return 0;
 386         }
 387
 388         err = dquot_initialize(dir);
 389         if (err)
 390                 return err;
 391
 392         f2fs_balance_fs(sbi, true);
 393
 394         f2fs_lock_op(sbi);
 395
 396         de = f2fs_find_entry(dir, &dot, &page);
 397         if (de) {
 398                 f2fs_put_page(page, 0);
 399         } else if (IS_ERR(page)) {
 400                 err = PTR_ERR(page);
 401                 goto out;
 402         } else {
 403                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 404                 if (err)
 405                         goto out;
 406         }
 407
 408         de = f2fs_find_entry(dir, &dotdot, &page);
 409         if (de)
 410                 f2fs_put_page(page, 0);
 411         else if (IS_ERR(page))
 412                 err = PTR_ERR(page);
 413         else
 414                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 415 out:
 416         if (!err)
 417                 clear_inode_flag(dir, FI_INLINE_DOTS);
 418
 419         f2fs_unlock_op(sbi);
 420         return err;
 421 }
 422
 423 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 424                 unsigned int flags)
 425 {
 426         struct inode *inode = NULL;
 427         struct f2fs_dir_entry *de;
 428         struct page *page;
 429         struct dentry *new;
 430         nid_t ino = -1;
 431         int err = 0;
 432         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 433
 434         trace_f2fs_lookup_start(dir, dentry, flags);
 435
 436         err = fscrypt_prepare_lookup(dir, dentry, flags);
 437         if (err)
 438                 goto out;
 439
 440         if (dentry->d_name.len > F2FS_NAME_LEN) {
 441                 err = -ENAMETOOLONG;
 442                 goto out;
 443         }
 444
 445         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 446         if (!de) {
 447                 if (IS_ERR(page)) {
 448                         err = PTR_ERR(page);
 449                         goto out;
 450                 }
 451                 goto out_splice;
 452         }
 453
 454         ino = le32_to_cpu(de->ino);
 455         f2fs_put_page(page, 0);
 456
 457         inode = f2fs_iget(dir->i_sb, ino);
 458         if (IS_ERR(inode)) {
 459                 err = PTR_ERR(inode);
 460                 goto out;
 461         }
 462
 463         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 464                 err = __recover_dot_dentries(dir, root_ino);
 465                 if (err)
 466                         goto out_iput;
 467         }
 468
 469         if (f2fs_has_inline_dots(inode)) {
 470                 err = __recover_dot_dentries(inode, dir->i_ino);
 471                 if (err)
 472                         goto out_iput;
 473         }
 474         if (f2fs_encrypted_inode(dir) &&
 475             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 476             !fscrypt_has_permitted_context(dir, inode)) {
 477                 f2fs_msg(inode->i_sb, KERN_WARNING,
 478                          "Inconsistent encryption contexts: %lu/%lu",
 479                          dir->i_ino, inode->i_ino);
 480                 err = -EPERM;
 481                 goto out_iput;
 482         }
 483 out_splice:
 484         new = d_splice_alias(inode, dentry);
 485         if (IS_ERR(new))
 486                 err = PTR_ERR(new);
 487         trace_f2fs_lookup_end(dir, dentry, ino, err);
 488         return new;
 489 out_iput:
 490         iput(inode);
 491 out:
 492         trace_f2fs_lookup_end(dir, dentry, ino, err);
 493         return ERR_PTR(err);
 494 }
 495
 496 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 497 {
 498         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 499         struct inode *inode = d_inode(dentry);
 500         struct f2fs_dir_entry *de;
 501         struct page *page;
 502         int err = -ENOENT;
 503
 504         trace_f2fs_unlink_enter(dir, dentry);
 505
 506         if (unlikely(f2fs_cp_error(sbi)))
 507                 return -EIO;
 508
 509         err = dquot_initialize(dir);
 510         if (err)
 511                 return err;
 512         err = dquot_initialize(inode);
 513         if (err)
 514                 return err;
 515
 516         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 517         if (!de) {
 518                 if (IS_ERR(page))
 519                         err = PTR_ERR(page);
 520                 goto fail;
 521         }
 522
 523         f2fs_balance_fs(sbi, true);
 524
 525         f2fs_lock_op(sbi);
 526         err = f2fs_acquire_orphan_inode(sbi);
 527         if (err) {
 528                 f2fs_unlock_op(sbi);
 529                 f2fs_put_page(page, 0);
 530                 goto fail;
 531         }
 532         f2fs_delete_entry(de, page, dir, inode);
 533         f2fs_unlock_op(sbi);
 534
 535         if (IS_DIRSYNC(dir))
 536                 f2fs_sync_fs(sbi->sb, 1);
 537 fail:
 538         trace_f2fs_unlink_exit(inode, err);
 539         return err;
 540 }
 541
 542 static const char *f2fs_get_link(struct dentry *dentry,
 543                                  struct inode *inode,
 544                                  struct delayed_call *done)
 545 {
 546         const char *link = page_get_link(dentry, inode, done);
 547         if (!IS_ERR(link) && !*link) {
 548                 /* this is broken symlink case */
 549                 do_delayed_call(done);
 550                 clear_delayed_call(done);
 551                 link = ERR_PTR(-ENOENT);
 552         }
 553         return link;
 554 }
 555
 556 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 557                                         const char *symname)
 558 {
 559         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 560         struct inode *inode;
 561         size_t len = strlen(symname);
 562         struct fscrypt_str disk_link;
 563         int err;
 564
 565         if (unlikely(f2fs_cp_error(sbi)))
 566                 return -EIO;
 567
 568         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 569                                       &disk_link);
 570         if (err)
 571                 return err;
 572
 573         err = dquot_initialize(dir);
 574         if (err)
 575                 return err;
 576
 577         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 578         if (IS_ERR(inode))
 579                 return PTR_ERR(inode);
 580
 581         if (IS_ENCRYPTED(inode))
 582                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 583         else
 584                 inode->i_op = &f2fs_symlink_inode_operations;
 585         inode_nohighmem(inode);
 586         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 587
 588         f2fs_lock_op(sbi);
 589         err = f2fs_add_link(dentry, inode);
 590         if (err)
 591                 goto out_f2fs_handle_failed_inode;
 592         f2fs_unlock_op(sbi);
 593         f2fs_alloc_nid_done(sbi, inode->i_ino);
 594
 595         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 596         if (err)
 597                 goto err_out;
 598
 599         err = page_symlink(inode, disk_link.name, disk_link.len);
 600
 601 err_out:
 602         d_instantiate_new(dentry, inode);
 603
 604         /*
 605          * Let's flush symlink data in order to avoid broken symlink as much as
 606          * possible. Nevertheless, fsyncing is the best way, but there is no
 607          * way to get a file descriptor in order to flush that.
 608          *
 609          * Note that, it needs to do dir->fsync to make this recoverable.
 610          * If the symlink path is stored into inline_data, there is no
 611          * performance regression.
 612          */
 613         if (!err) {
 614                 filemap_write_and_wait_range(inode->i_mapping, 0,
 615                                                         disk_link.len - 1);
 616
 617                 if (IS_DIRSYNC(dir))
 618                         f2fs_sync_fs(sbi->sb, 1);
 619         } else {
 620                 f2fs_unlink(dir, dentry);
 621         }
 622
 623         f2fs_balance_fs(sbi, true);
 624         goto out_free_encrypted_link;
 625
 626 out_f2fs_handle_failed_inode:
 627         f2fs_handle_failed_inode(inode);
 628 out_free_encrypted_link:
 629         if (disk_link.name != (unsigned char *)symname)
 630                 kfree(disk_link.name);
 631         return err;
 632 }
 633
 634 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 635 {
 636         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 637         struct inode *inode;
 638         int err;
 639
 640         if (unlikely(f2fs_cp_error(sbi)))
 641                 return -EIO;
 642
 643         err = dquot_initialize(dir);
 644         if (err)
 645                 return err;
 646
 647         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 648         if (IS_ERR(inode))
 649                 return PTR_ERR(inode);
 650
 651         inode->i_op = &f2fs_dir_inode_operations;
 652         inode->i_fop = &f2fs_dir_operations;
 653         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 654         inode_nohighmem(inode);
 655
 656         set_inode_flag(inode, FI_INC_LINK);
 657         f2fs_lock_op(sbi);
 658         err = f2fs_add_link(dentry, inode);
 659         if (err)
 660                 goto out_fail;
 661         f2fs_unlock_op(sbi);
 662
 663         f2fs_alloc_nid_done(sbi, inode->i_ino);
 664
 665         d_instantiate_new(dentry, inode);
 666
 667         if (IS_DIRSYNC(dir))
 668                 f2fs_sync_fs(sbi->sb, 1);
 669
 670         f2fs_balance_fs(sbi, true);
 671         return 0;
 672
 673 out_fail:
 674         clear_inode_flag(inode, FI_INC_LINK);
 675         f2fs_handle_failed_inode(inode);
 676         return err;
 677 }
 678
 679 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 680 {
 681         struct inode *inode = d_inode(dentry);
 682         if (f2fs_empty_dir(inode))
 683                 return f2fs_unlink(dir, dentry);
 684         return -ENOTEMPTY;
 685 }
 686
 687 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 688                                 umode_t mode, dev_t rdev)
 689 {
 690         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 691         struct inode *inode;
 692         int err = 0;
 693
 694         if (unlikely(f2fs_cp_error(sbi)))
 695                 return -EIO;
 696
 697         err = dquot_initialize(dir);
 698         if (err)
 699                 return err;
 700
 701         inode = f2fs_new_inode(dir, mode);
 702         if (IS_ERR(inode))
 703                 return PTR_ERR(inode);
 704
 705         init_special_inode(inode, inode->i_mode, rdev);
 706         inode->i_op = &f2fs_special_inode_operations;
 707
 708         f2fs_lock_op(sbi);
 709         err = f2fs_add_link(dentry, inode);
 710         if (err)
 711                 goto out;
 712         f2fs_unlock_op(sbi);
 713
 714         f2fs_alloc_nid_done(sbi, inode->i_ino);
 715
 716         d_instantiate_new(dentry, inode);
 717
 718         if (IS_DIRSYNC(dir))
 719                 f2fs_sync_fs(sbi->sb, 1);
 720
 721         f2fs_balance_fs(sbi, true);
 722         return 0;
 723 out:
 724         f2fs_handle_failed_inode(inode);
 725         return err;
 726 }
 727
 728 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 729                                         umode_t mode, struct inode **whiteout)
 730 {
 731         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 732         struct inode *inode;
 733         int err;
 734
 735         err = dquot_initialize(dir);
 736         if (err)
 737                 return err;
 738
 739         inode = f2fs_new_inode(dir, mode);
 740         if (IS_ERR(inode))
 741                 return PTR_ERR(inode);
 742
 743         if (whiteout) {
 744                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 745                 inode->i_op = &f2fs_special_inode_operations;
 746         } else {
 747                 inode->i_op = &f2fs_file_inode_operations;
 748                 inode->i_fop = &f2fs_file_operations;
 749                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 750         }
 751
 752         f2fs_lock_op(sbi);
 753         err = f2fs_acquire_orphan_inode(sbi);
 754         if (err)
 755                 goto out;
 756
 757         err = f2fs_do_tmpfile(inode, dir);
 758         if (err)
 759                 goto release_out;
 760
 761         /*
 762          * add this non-linked tmpfile to orphan list, in this way we could
 763          * remove all unused data of tmpfile after abnormal power-off.
 764          */
 765         f2fs_add_orphan_inode(inode);
 766         f2fs_alloc_nid_done(sbi, inode->i_ino);
 767
 768         if (whiteout) {
 769                 f2fs_i_links_write(inode, false);
 770                 *whiteout = inode;
 771         } else {
 772                 d_tmpfile(dentry, inode);
 773         }
 774         /* link_count was changed by d_tmpfile as well. */
 775         f2fs_unlock_op(sbi);
 776         unlock_new_inode(inode);
 777
 778         f2fs_balance_fs(sbi, true);
 779         return 0;
 780
 781 release_out:
 782         f2fs_release_orphan_inode(sbi);
 783 out:
 784         f2fs_handle_failed_inode(inode);
 785         return err;
 786 }
 787
 788 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 789 {
 790         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 791
 792         if (unlikely(f2fs_cp_error(sbi)))
 793                 return -EIO;
 794
 795         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 796                 int err = fscrypt_get_encryption_info(dir);
 797                 if (err)
 798                         return err;
 799         }
 800
 801         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 802 }
 803
 804 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 805 {
 806         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 807                 return -EIO;
 808
 809         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 810 }
 811
 812 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 813                         struct inode *new_dir, struct dentry *new_dentry,
 814                         unsigned int flags)
 815 {
 816         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 817         struct inode *old_inode = d_inode(old_dentry);
 818         struct inode *new_inode = d_inode(new_dentry);
 819         struct inode *whiteout = NULL;
 820         struct page *old_dir_page;
 821         struct page *old_page, *new_page = NULL;
 822         struct f2fs_dir_entry *old_dir_entry = NULL;
 823         struct f2fs_dir_entry *old_entry;
 824         struct f2fs_dir_entry *new_entry;
 825         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 826         int err = -ENOENT;
 827
 828         if (unlikely(f2fs_cp_error(sbi)))
 829                 return -EIO;
 830
 831         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 832                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 833                         F2FS_I(old_dentry->d_inode)->i_projid)))
 834                 return -EXDEV;
 835
 836         err = dquot_initialize(old_dir);
 837         if (err)
 838                 goto out;
 839
 840         err = dquot_initialize(new_dir);
 841         if (err)
 842                 goto out;
 843
 844         if (new_inode) {
 845                 err = dquot_initialize(new_inode);
 846                 if (err)
 847                         goto out;
 848         }
 849
 850         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 851         if (!old_entry) {
 852                 if (IS_ERR(old_page))
 853                         err = PTR_ERR(old_page);
 854                 goto out;
 855         }
 856
 857         if (S_ISDIR(old_inode->i_mode)) {
 858                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 859                 if (!old_dir_entry) {
 860                         if (IS_ERR(old_dir_page))
 861                                 err = PTR_ERR(old_dir_page);
 862                         goto out_old;
 863                 }
 864         }
 865
 866         if (flags & RENAME_WHITEOUT) {
 867                 err = f2fs_create_whiteout(old_dir, &whiteout);
 868                 if (err)
 869                         goto out_dir;
 870         }
 871
 872         if (new_inode) {
 873
 874                 err = -ENOTEMPTY;
 875                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 876                         goto out_whiteout;
 877
 878                 err = -ENOENT;
 879                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 880                                                 &new_page);
 881                 if (!new_entry) {
 882                         if (IS_ERR(new_page))
 883                                 err = PTR_ERR(new_page);
 884                         goto out_whiteout;
 885                 }
 886
 887                 f2fs_balance_fs(sbi, true);
 888
 889                 f2fs_lock_op(sbi);
 890
 891                 err = f2fs_acquire_orphan_inode(sbi);
 892                 if (err)
 893                         goto put_out_dir;
 894
 895                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 896
 897                 new_inode->i_ctime = current_time(new_inode);
 898                 down_write(&F2FS_I(new_inode)->i_sem);
 899                 if (old_dir_entry)
 900                         f2fs_i_links_write(new_inode, false);
 901                 f2fs_i_links_write(new_inode, false);
 902                 up_write(&F2FS_I(new_inode)->i_sem);
 903
 904                 if (!new_inode->i_nlink)
 905                         f2fs_add_orphan_inode(new_inode);
 906                 else
 907                         f2fs_release_orphan_inode(sbi);
 908         } else {
 909                 f2fs_balance_fs(sbi, true);
 910
 911                 f2fs_lock_op(sbi);
 912
 913                 err = f2fs_add_link(new_dentry, old_inode);
 914                 if (err) {
 915                         f2fs_unlock_op(sbi);
 916                         goto out_whiteout;
 917                 }
 918
 919                 if (old_dir_entry)
 920                         f2fs_i_links_write(new_dir, true);
 921
 922                 /*
 923                  * old entry and new entry can locate in the same inline
 924                  * dentry in inode, when attaching new entry in inline dentry,
 925                  * it could force inline dentry conversion, after that,
 926                  * old_entry and old_page will point to wrong address, in
 927                  * order to avoid this, let's do the check and update here.
 928                  */
 929                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 930                         f2fs_put_page(old_page, 0);
 931                         old_page = NULL;
 932
 933                         old_entry = f2fs_find_entry(old_dir,
 934                                                 &old_dentry->d_name, &old_page);
 935                         if (!old_entry) {
 936                                 err = -ENOENT;
 937                                 if (IS_ERR(old_page))
 938                                         err = PTR_ERR(old_page);
 939                                 f2fs_unlock_op(sbi);
 940                                 goto out_whiteout;
 941                         }
 942                 }
 943         }
 944
 945         down_write(&F2FS_I(old_inode)->i_sem);
 946         if (!old_dir_entry || whiteout)
 947                 file_lost_pino(old_inode);
 948         else
 949                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 950         up_write(&F2FS_I(old_inode)->i_sem);
 951
 952         old_inode->i_ctime = current_time(old_inode);
 953         f2fs_mark_inode_dirty_sync(old_inode, false);
 954
 955         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 956
 957         if (whiteout) {
 958                 whiteout->i_state |= I_LINKABLE;
 959                 set_inode_flag(whiteout, FI_INC_LINK);
 960                 err = f2fs_add_link(old_dentry, whiteout);
 961                 if (err)
 962                         goto put_out_dir;
 963                 whiteout->i_state &= ~I_LINKABLE;
 964                 iput(whiteout);
 965         }
 966
 967         if (old_dir_entry) {
 968                 if (old_dir != new_dir && !whiteout)
 969                         f2fs_set_link(old_inode, old_dir_entry,
 970                                                 old_dir_page, new_dir);
 971                 else
 972                         f2fs_put_page(old_dir_page, 0);
 973                 f2fs_i_links_write(old_dir, false);
 974         }
 975         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 976                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 977                 if (S_ISDIR(old_inode->i_mode))
 978                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
 979                                                         TRANS_DIR_INO);
 980         }
 981
 982         f2fs_unlock_op(sbi);
 983
 984         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 985                 f2fs_sync_fs(sbi->sb, 1);
 986         return 0;
 987
 988 put_out_dir:
 989         f2fs_unlock_op(sbi);
 990         if (new_page)
 991                 f2fs_put_page(new_page, 0);
 992 out_whiteout:
 993         if (whiteout)
 994                 iput(whiteout);
 995 out_dir:
 996         if (old_dir_entry)
 997                 f2fs_put_page(old_dir_page, 0);
 998 out_old:
 999         f2fs_put_page(old_page, 0);
1000 out:
1001         return err;
1002 }
1003
1004 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1005                              struct inode *new_dir, struct dentry *new_dentry)
1006 {
1007         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1008         struct inode *old_inode = d_inode(old_dentry);
1009         struct inode *new_inode = d_inode(new_dentry);
1010         struct page *old_dir_page, *new_dir_page;
1011         struct page *old_page, *new_page;
1012         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1013         struct f2fs_dir_entry *old_entry, *new_entry;
1014         int old_nlink = 0, new_nlink = 0;
1015         int err = -ENOENT;
1016
1017         if (unlikely(f2fs_cp_error(sbi)))
1018                 return -EIO;
1019
1020         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1021                         !projid_eq(F2FS_I(new_dir)->i_projid,
1022                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1023             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1024                         !projid_eq(F2FS_I(old_dir)->i_projid,
1025                         F2FS_I(new_dentry->d_inode)->i_projid)))
1026                 return -EXDEV;
1027
1028         err = dquot_initialize(old_dir);
1029         if (err)
1030                 goto out;
1031
1032         err = dquot_initialize(new_dir);
1033         if (err)
1034                 goto out;
1035
1036         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1037         if (!old_entry) {
1038                 if (IS_ERR(old_page))
1039                         err = PTR_ERR(old_page);
1040                 goto out;
1041         }
1042
1043         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1044         if (!new_entry) {
1045                 if (IS_ERR(new_page))
1046                         err = PTR_ERR(new_page);
1047                 goto out_old;
1048         }
1049
1050         /* prepare for updating ".." directory entry info later */
1051         if (old_dir != new_dir) {
1052                 if (S_ISDIR(old_inode->i_mode)) {
1053                         old_dir_entry = f2fs_parent_dir(old_inode,
1054                                                         &old_dir_page);
1055                         if (!old_dir_entry) {
1056                                 if (IS_ERR(old_dir_page))
1057                                         err = PTR_ERR(old_dir_page);
1058                                 goto out_new;
1059                         }
1060                 }
1061
1062                 if (S_ISDIR(new_inode->i_mode)) {
1063                         new_dir_entry = f2fs_parent_dir(new_inode,
1064                                                         &new_dir_page);
1065                         if (!new_dir_entry) {
1066                                 if (IS_ERR(new_dir_page))
1067                                         err = PTR_ERR(new_dir_page);
1068                                 goto out_old_dir;
1069                         }
1070                 }
1071         }
1072
1073         /*
1074          * If cross rename between file and directory those are not
1075          * in the same directory, we will inc nlink of file's parent
1076          * later, so we should check upper boundary of its nlink.
1077          */
1078         if ((!old_dir_entry || !new_dir_entry) &&
1079                                 old_dir_entry != new_dir_entry) {
1080                 old_nlink = old_dir_entry ? -1 : 1;
1081                 new_nlink = -old_nlink;
1082                 err = -EMLINK;
1083                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1084                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1085                         goto out_new_dir;
1086         }
1087
1088         f2fs_balance_fs(sbi, true);
1089
1090         f2fs_lock_op(sbi);
1091
1092         /* update ".." directory entry info of old dentry */
1093         if (old_dir_entry)
1094                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1095
1096         /* update ".." directory entry info of new dentry */
1097         if (new_dir_entry)
1098                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1099
1100         /* update directory entry info of old dir inode */
1101         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1102
1103         down_write(&F2FS_I(old_inode)->i_sem);
1104         file_lost_pino(old_inode);
1105         up_write(&F2FS_I(old_inode)->i_sem);
1106
1107         old_dir->i_ctime = current_time(old_dir);
1108         if (old_nlink) {
1109                 down_write(&F2FS_I(old_dir)->i_sem);
1110                 f2fs_i_links_write(old_dir, old_nlink > 0);
1111                 up_write(&F2FS_I(old_dir)->i_sem);
1112         }
1113         f2fs_mark_inode_dirty_sync(old_dir, false);
1114
1115         /* update directory entry info of new dir inode */
1116         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1117
1118         down_write(&F2FS_I(new_inode)->i_sem);
1119         file_lost_pino(new_inode);
1120         up_write(&F2FS_I(new_inode)->i_sem);
1121
1122         new_dir->i_ctime = current_time(new_dir);
1123         if (new_nlink) {
1124                 down_write(&F2FS_I(new_dir)->i_sem);
1125                 f2fs_i_links_write(new_dir, new_nlink > 0);
1126                 up_write(&F2FS_I(new_dir)->i_sem);
1127         }
1128         f2fs_mark_inode_dirty_sync(new_dir, false);
1129
1130         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1131                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1132                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1133         }
1134
1135         f2fs_unlock_op(sbi);
1136
1137         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1138                 f2fs_sync_fs(sbi->sb, 1);
1139         return 0;
1140 out_new_dir:
1141         if (new_dir_entry) {
1142                 f2fs_put_page(new_dir_page, 0);
1143         }
1144 out_old_dir:
1145         if (old_dir_entry) {
1146                 f2fs_put_page(old_dir_page, 0);
1147         }
1148 out_new:
1149         f2fs_put_page(new_page, 0);
1150 out_old:
1151         f2fs_put_page(old_page, 0);
1152 out:
1153         return err;
1154 }
1155
1156 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1157                         struct inode *new_dir, struct dentry *new_dentry,
1158                         unsigned int flags)
1159 {
1160         int err;
1161
1162         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1163                 return -EINVAL;
1164
1165         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1166                                      flags);
1167         if (err)
1168                 return err;
1169
1170         if (flags & RENAME_EXCHANGE) {
1171                 return f2fs_cross_rename(old_dir, old_dentry,
1172                                          new_dir, new_dentry);
1173         }
1174         /*
1175          * VFS has already handled the new dentry existence case,
1176          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1177          */
1178         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1179 }
1180
1181 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1182                                            struct inode *inode,
1183                                            struct delayed_call *done)
1184 {
1185         struct page *page;
1186         const char *target;
1187
1188         if (!dentry)
1189                 return ERR_PTR(-ECHILD);
1190
1191         page = read_mapping_page(inode->i_mapping, 0, NULL);
1192         if (IS_ERR(page))
1193                 return ERR_CAST(page);
1194
1195         target = fscrypt_get_symlink(inode, page_address(page),
1196                                      inode->i_sb->s_blocksize, done);
1197         put_page(page);
1198         return target;
1199 }
1200
1201 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1202         .get_link       = f2fs_encrypted_get_link,
1203         .getattr        = f2fs_getattr,
1204         .setattr        = f2fs_setattr,
1205 #ifdef CONFIG_F2FS_FS_XATTR
1206         .listxattr      = f2fs_listxattr,
1207 #endif
1208 };
1209
1210 const struct inode_operations f2fs_dir_inode_operations = {
1211         .create         = f2fs_create,
1212         .lookup         = f2fs_lookup,
1213         .link           = f2fs_link,
1214         .unlink         = f2fs_unlink,
1215         .symlink        = f2fs_symlink,
1216         .mkdir          = f2fs_mkdir,
1217         .rmdir          = f2fs_rmdir,
1218         .mknod          = f2fs_mknod,
1219         .rename         = f2fs_rename2,
1220         .tmpfile        = f2fs_tmpfile,
1221         .getattr        = f2fs_getattr,
1222         .setattr        = f2fs_setattr,
1223         .get_acl        = f2fs_get_acl,
1224         .set_acl        = f2fs_set_acl,
1225 #ifdef CONFIG_F2FS_FS_XATTR
1226         .listxattr      = f2fs_listxattr,
1227 #endif
1228 };
1229
1230 const struct inode_operations f2fs_symlink_inode_operations = {
1231         .get_link       = f2fs_get_link,
1232         .getattr        = f2fs_getattr,
1233         .setattr        = f2fs_setattr,
1234 #ifdef CONFIG_F2FS_FS_XATTR
1235         .listxattr      = f2fs_listxattr,
1236 #endif
1237 };
1238
1239 const struct inode_operations f2fs_special_inode_operations = {
1240         .getattr        = f2fs_getattr,
1241         .setattr        = f2fs_setattr,
1242         .get_acl        = f2fs_get_acl,
1243         .set_acl        = f2fs_set_acl,
1244 #ifdef CONFIG_F2FS_FS_XATTR
1245         .listxattr      = f2fs_listxattr,
1246 #endif
1247 };