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 = F2FS_OPTION(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_extension_exist(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_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 172                 const unsigned char *name)
 173 {
 174         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 175         int i, cold_count, hot_count;
 176
 177         down_read(&sbi->sb_lock);
 178
 179         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 180         hot_count = sbi->raw_super->hot_ext_count;
 181
 182         for (i = 0; i < cold_count + hot_count; i++) {
 183                 if (!is_extension_exist(name, extlist[i]))
 184                         continue;
 185                 if (i < cold_count)
 186                         file_set_cold(inode);
 187                 else
 188                         file_set_hot(inode);
 189                 break;
 190         }
 191
 192         up_read(&sbi->sb_lock);
 193 }
 194
 195 int update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 196                                                         bool hot, bool set)
 197 {
 198         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 199         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 200         int hot_count = sbi->raw_super->hot_ext_count;
 201         int total_count = cold_count + hot_count;
 202         int start, count;
 203         int i;
 204
 205         if (set) {
 206                 if (total_count == F2FS_MAX_EXTENSION)
 207                         return -EINVAL;
 208         } else {
 209                 if (!hot && !cold_count)
 210                         return -EINVAL;
 211                 if (hot && !hot_count)
 212                         return -EINVAL;
 213         }
 214
 215         if (hot) {
 216                 start = cold_count;
 217                 count = total_count;
 218         } else {
 219                 start = 0;
 220                 count = cold_count;
 221         }
 222
 223         for (i = start; i < count; i++) {
 224                 if (strcmp(name, extlist[i]))
 225                         continue;
 226
 227                 if (set)
 228                         return -EINVAL;
 229
 230                 memcpy(extlist[i], extlist[i + 1],
 231                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 232                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 233                 if (hot)
 234                         sbi->raw_super->hot_ext_count = hot_count - 1;
 235                 else
 236                         sbi->raw_super->extension_count =
 237                                                 cpu_to_le32(cold_count - 1);
 238                 return 0;
 239         }
 240
 241         if (!set)
 242                 return -EINVAL;
 243
 244         if (hot) {
 245                 strncpy(extlist[count], name, strlen(name));
 246                 sbi->raw_super->hot_ext_count = hot_count + 1;
 247         } else {
 248                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 249
 250                 memcpy(buf, &extlist[cold_count],
 251                                 F2FS_EXTENSION_LEN * hot_count);
 252                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 253                 strncpy(extlist[cold_count], name, strlen(name));
 254                 memcpy(&extlist[cold_count + 1], buf,
 255                                 F2FS_EXTENSION_LEN * hot_count);
 256                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 257         }
 258         return 0;
 259 }
 260
 261 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 262                                                 bool excl)
 263 {
 264         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 265         struct inode *inode;
 266         nid_t ino = 0;
 267         int err;
 268
 269         if (unlikely(f2fs_cp_error(sbi)))
 270                 return -EIO;
 271
 272         err = dquot_initialize(dir);
 273         if (err)
 274                 return err;
 275
 276         inode = f2fs_new_inode(dir, mode);
 277         if (IS_ERR(inode))
 278                 return PTR_ERR(inode);
 279
 280         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 281                 set_file_temperature(sbi, inode, dentry->d_name.name);
 282
 283         inode->i_op = &f2fs_file_inode_operations;
 284         inode->i_fop = &f2fs_file_operations;
 285         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 286         ino = inode->i_ino;
 287
 288         f2fs_lock_op(sbi);
 289         err = f2fs_add_link(dentry, inode);
 290         if (err)
 291                 goto out;
 292         f2fs_unlock_op(sbi);
 293
 294         alloc_nid_done(sbi, ino);
 295
 296         d_instantiate(dentry, inode);
 297         unlock_new_inode(inode);
 298
 299         if (IS_DIRSYNC(dir))
 300                 f2fs_sync_fs(sbi->sb, 1);
 301
 302         f2fs_balance_fs(sbi, true);
 303         return 0;
 304 out:
 305         handle_failed_inode(inode);
 306         return err;
 307 }
 308
 309 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 310                 struct dentry *dentry)
 311 {
 312         struct inode *inode = d_inode(old_dentry);
 313         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 314         int err;
 315
 316         if (unlikely(f2fs_cp_error(sbi)))
 317                 return -EIO;
 318
 319         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 320         if (err)
 321                 return err;
 322
 323         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 324                         (!projid_eq(F2FS_I(dir)->i_projid,
 325                         F2FS_I(old_dentry->d_inode)->i_projid)))
 326                 return -EXDEV;
 327
 328         err = dquot_initialize(dir);
 329         if (err)
 330                 return err;
 331
 332         f2fs_balance_fs(sbi, true);
 333
 334         inode->i_ctime = current_time(inode);
 335         ihold(inode);
 336
 337         set_inode_flag(inode, FI_INC_LINK);
 338         f2fs_lock_op(sbi);
 339         err = f2fs_add_link(dentry, inode);
 340         if (err)
 341                 goto out;
 342         f2fs_unlock_op(sbi);
 343
 344         d_instantiate(dentry, inode);
 345
 346         if (IS_DIRSYNC(dir))
 347                 f2fs_sync_fs(sbi->sb, 1);
 348         return 0;
 349 out:
 350         clear_inode_flag(inode, FI_INC_LINK);
 351         iput(inode);
 352         f2fs_unlock_op(sbi);
 353         return err;
 354 }
 355
 356 struct dentry *f2fs_get_parent(struct dentry *child)
 357 {
 358         struct qstr dotdot = QSTR_INIT("..", 2);
 359         struct page *page;
 360         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 361         if (!ino) {
 362                 if (IS_ERR(page))
 363                         return ERR_CAST(page);
 364                 return ERR_PTR(-ENOENT);
 365         }
 366         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 367 }
 368
 369 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 370 {
 371         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 372         struct qstr dot = QSTR_INIT(".", 1);
 373         struct qstr dotdot = QSTR_INIT("..", 2);
 374         struct f2fs_dir_entry *de;
 375         struct page *page;
 376         int err = 0;
 377
 378         if (f2fs_readonly(sbi->sb)) {
 379                 f2fs_msg(sbi->sb, KERN_INFO,
 380                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 381                         "in readonly mountpoint", dir->i_ino, pino);
 382                 return 0;
 383         }
 384
 385         err = dquot_initialize(dir);
 386         if (err)
 387                 return err;
 388
 389         f2fs_balance_fs(sbi, true);
 390
 391         f2fs_lock_op(sbi);
 392
 393         de = f2fs_find_entry(dir, &dot, &page);
 394         if (de) {
 395                 f2fs_put_page(page, 0);
 396         } else if (IS_ERR(page)) {
 397                 err = PTR_ERR(page);
 398                 goto out;
 399         } else {
 400                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 401                 if (err)
 402                         goto out;
 403         }
 404
 405         de = f2fs_find_entry(dir, &dotdot, &page);
 406         if (de)
 407                 f2fs_put_page(page, 0);
 408         else if (IS_ERR(page))
 409                 err = PTR_ERR(page);
 410         else
 411                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 412 out:
 413         if (!err)
 414                 clear_inode_flag(dir, FI_INLINE_DOTS);
 415
 416         f2fs_unlock_op(sbi);
 417         return err;
 418 }
 419
 420 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 421                 unsigned int flags)
 422 {
 423         struct inode *inode = NULL;
 424         struct f2fs_dir_entry *de;
 425         struct page *page;
 426         struct dentry *new;
 427         nid_t ino = -1;
 428         int err = 0;
 429         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 430
 431         trace_f2fs_lookup_start(dir, dentry, flags);
 432
 433         err = fscrypt_prepare_lookup(dir, dentry, flags);
 434         if (err)
 435                 goto out;
 436
 437         if (dentry->d_name.len > F2FS_NAME_LEN) {
 438                 err = -ENAMETOOLONG;
 439                 goto out;
 440         }
 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 out;
 447                 }
 448                 goto out_splice;
 449         }
 450
 451         ino = le32_to_cpu(de->ino);
 452         f2fs_put_page(page, 0);
 453
 454         inode = f2fs_iget(dir->i_sb, ino);
 455         if (IS_ERR(inode)) {
 456                 err = PTR_ERR(inode);
 457                 goto out;
 458         }
 459
 460         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 461                 err = __recover_dot_dentries(dir, root_ino);
 462                 if (err)
 463                         goto out_iput;
 464         }
 465
 466         if (f2fs_has_inline_dots(inode)) {
 467                 err = __recover_dot_dentries(inode, dir->i_ino);
 468                 if (err)
 469                         goto out_iput;
 470         }
 471         if (f2fs_encrypted_inode(dir) &&
 472             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 473             !fscrypt_has_permitted_context(dir, inode)) {
 474                 f2fs_msg(inode->i_sb, KERN_WARNING,
 475                          "Inconsistent encryption contexts: %lu/%lu",
 476                          dir->i_ino, inode->i_ino);
 477                 err = -EPERM;
 478                 goto out_iput;
 479         }
 480 out_splice:
 481         new = d_splice_alias(inode, dentry);
 482         if (IS_ERR(new))
 483                 err = PTR_ERR(new);
 484         trace_f2fs_lookup_end(dir, dentry, ino, err);
 485         return new;
 486 out_iput:
 487         iput(inode);
 488 out:
 489         trace_f2fs_lookup_end(dir, dentry, ino, err);
 490         return ERR_PTR(err);
 491 }
 492
 493 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 494 {
 495         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 496         struct inode *inode = d_inode(dentry);
 497         struct f2fs_dir_entry *de;
 498         struct page *page;
 499         int err = -ENOENT;
 500
 501         trace_f2fs_unlink_enter(dir, dentry);
 502
 503         if (unlikely(f2fs_cp_error(sbi)))
 504                 return -EIO;
 505
 506         err = dquot_initialize(dir);
 507         if (err)
 508                 return err;
 509         err = dquot_initialize(inode);
 510         if (err)
 511                 return err;
 512
 513         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 514         if (!de) {
 515                 if (IS_ERR(page))
 516                         err = PTR_ERR(page);
 517                 goto fail;
 518         }
 519
 520         f2fs_balance_fs(sbi, true);
 521
 522         f2fs_lock_op(sbi);
 523         err = acquire_orphan_inode(sbi);
 524         if (err) {
 525                 f2fs_unlock_op(sbi);
 526                 f2fs_put_page(page, 0);
 527                 goto fail;
 528         }
 529         f2fs_delete_entry(de, page, dir, inode);
 530         f2fs_unlock_op(sbi);
 531
 532         if (IS_DIRSYNC(dir))
 533                 f2fs_sync_fs(sbi->sb, 1);
 534 fail:
 535         trace_f2fs_unlink_exit(inode, err);
 536         return err;
 537 }
 538
 539 static const char *f2fs_get_link(struct dentry *dentry,
 540                                  struct inode *inode,
 541                                  struct delayed_call *done)
 542 {
 543         const char *link = page_get_link(dentry, inode, done);
 544         if (!IS_ERR(link) && !*link) {
 545                 /* this is broken symlink case */
 546                 do_delayed_call(done);
 547                 clear_delayed_call(done);
 548                 link = ERR_PTR(-ENOENT);
 549         }
 550         return link;
 551 }
 552
 553 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 554                                         const char *symname)
 555 {
 556         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 557         struct inode *inode;
 558         size_t len = strlen(symname);
 559         struct fscrypt_str disk_link;
 560         int err;
 561
 562         if (unlikely(f2fs_cp_error(sbi)))
 563                 return -EIO;
 564
 565         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 566                                       &disk_link);
 567         if (err)
 568                 return err;
 569
 570         err = dquot_initialize(dir);
 571         if (err)
 572                 return err;
 573
 574         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 575         if (IS_ERR(inode))
 576                 return PTR_ERR(inode);
 577
 578         if (IS_ENCRYPTED(inode))
 579                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 580         else
 581                 inode->i_op = &f2fs_symlink_inode_operations;
 582         inode_nohighmem(inode);
 583         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 584
 585         f2fs_lock_op(sbi);
 586         err = f2fs_add_link(dentry, inode);
 587         if (err)
 588                 goto out_handle_failed_inode;
 589         f2fs_unlock_op(sbi);
 590         alloc_nid_done(sbi, inode->i_ino);
 591
 592         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 593         if (err)
 594                 goto err_out;
 595
 596         err = page_symlink(inode, disk_link.name, disk_link.len);
 597
 598 err_out:
 599         d_instantiate(dentry, inode);
 600         unlock_new_inode(inode);
 601
 602         /*
 603          * Let's flush symlink data in order to avoid broken symlink as much as
 604          * possible. Nevertheless, fsyncing is the best way, but there is no
 605          * way to get a file descriptor in order to flush that.
 606          *
 607          * Note that, it needs to do dir->fsync to make this recoverable.
 608          * If the symlink path is stored into inline_data, there is no
 609          * performance regression.
 610          */
 611         if (!err) {
 612                 filemap_write_and_wait_range(inode->i_mapping, 0,
 613                                                         disk_link.len - 1);
 614
 615                 if (IS_DIRSYNC(dir))
 616                         f2fs_sync_fs(sbi->sb, 1);
 617         } else {
 618                 f2fs_unlink(dir, dentry);
 619         }
 620
 621         f2fs_balance_fs(sbi, true);
 622         goto out_free_encrypted_link;
 623
 624 out_handle_failed_inode:
 625         handle_failed_inode(inode);
 626 out_free_encrypted_link:
 627         if (disk_link.name != (unsigned char *)symname)
 628                 kfree(disk_link.name);
 629         return err;
 630 }
 631
 632 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 633 {
 634         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 635         struct inode *inode;
 636         int err;
 637
 638         if (unlikely(f2fs_cp_error(sbi)))
 639                 return -EIO;
 640
 641         err = dquot_initialize(dir);
 642         if (err)
 643                 return err;
 644
 645         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 646         if (IS_ERR(inode))
 647                 return PTR_ERR(inode);
 648
 649         inode->i_op = &f2fs_dir_inode_operations;
 650         inode->i_fop = &f2fs_dir_operations;
 651         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 652         inode_nohighmem(inode);
 653
 654         set_inode_flag(inode, FI_INC_LINK);
 655         f2fs_lock_op(sbi);
 656         err = f2fs_add_link(dentry, inode);
 657         if (err)
 658                 goto out_fail;
 659         f2fs_unlock_op(sbi);
 660
 661         alloc_nid_done(sbi, inode->i_ino);
 662
 663         d_instantiate(dentry, inode);
 664         unlock_new_inode(inode);
 665
 666         if (IS_DIRSYNC(dir))
 667                 f2fs_sync_fs(sbi->sb, 1);
 668
 669         f2fs_balance_fs(sbi, true);
 670         return 0;
 671
 672 out_fail:
 673         clear_inode_flag(inode, FI_INC_LINK);
 674         handle_failed_inode(inode);
 675         return err;
 676 }
 677
 678 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 679 {
 680         struct inode *inode = d_inode(dentry);
 681         if (f2fs_empty_dir(inode))
 682                 return f2fs_unlink(dir, dentry);
 683         return -ENOTEMPTY;
 684 }
 685
 686 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 687                                 umode_t mode, dev_t rdev)
 688 {
 689         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 690         struct inode *inode;
 691         int err = 0;
 692
 693         if (unlikely(f2fs_cp_error(sbi)))
 694                 return -EIO;
 695
 696         err = dquot_initialize(dir);
 697         if (err)
 698                 return err;
 699
 700         inode = f2fs_new_inode(dir, mode);
 701         if (IS_ERR(inode))
 702                 return PTR_ERR(inode);
 703
 704         init_special_inode(inode, inode->i_mode, rdev);
 705         inode->i_op = &f2fs_special_inode_operations;
 706
 707         f2fs_lock_op(sbi);
 708         err = f2fs_add_link(dentry, inode);
 709         if (err)
 710                 goto out;
 711         f2fs_unlock_op(sbi);
 712
 713         alloc_nid_done(sbi, inode->i_ino);
 714
 715         d_instantiate(dentry, inode);
 716         unlock_new_inode(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         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 = 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         add_orphan_inode(inode);
 766         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         release_orphan_inode(sbi);
 783 out:
 784         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         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 791                 return -EIO;
 792
 793         if (f2fs_encrypted_inode(dir)) {
 794                 int err = fscrypt_get_encryption_info(dir);
 795                 if (err)
 796                         return err;
 797         }
 798
 799         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 800 }
 801
 802 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 803 {
 804         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 805                 return -EIO;
 806
 807         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 808 }
 809
 810 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 811                         struct inode *new_dir, struct dentry *new_dentry,
 812                         unsigned int flags)
 813 {
 814         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 815         struct inode *old_inode = d_inode(old_dentry);
 816         struct inode *new_inode = d_inode(new_dentry);
 817         struct inode *whiteout = NULL;
 818         struct page *old_dir_page;
 819         struct page *old_page, *new_page = NULL;
 820         struct f2fs_dir_entry *old_dir_entry = NULL;
 821         struct f2fs_dir_entry *old_entry;
 822         struct f2fs_dir_entry *new_entry;
 823         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 824         int err = -ENOENT;
 825
 826         if (unlikely(f2fs_cp_error(sbi)))
 827                 return -EIO;
 828
 829         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 830                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 831                         F2FS_I(old_dentry->d_inode)->i_projid)))
 832                 return -EXDEV;
 833
 834         err = dquot_initialize(old_dir);
 835         if (err)
 836                 goto out;
 837
 838         err = dquot_initialize(new_dir);
 839         if (err)
 840                 goto out;
 841
 842         if (new_inode) {
 843                 err = dquot_initialize(new_inode);
 844                 if (err)
 845                         goto out;
 846         }
 847
 848         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 849         if (!old_entry) {
 850                 if (IS_ERR(old_page))
 851                         err = PTR_ERR(old_page);
 852                 goto out;
 853         }
 854
 855         if (S_ISDIR(old_inode->i_mode)) {
 856                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 857                 if (!old_dir_entry) {
 858                         if (IS_ERR(old_dir_page))
 859                                 err = PTR_ERR(old_dir_page);
 860                         goto out_old;
 861                 }
 862         }
 863
 864         if (flags & RENAME_WHITEOUT) {
 865                 err = f2fs_create_whiteout(old_dir, &whiteout);
 866                 if (err)
 867                         goto out_dir;
 868         }
 869
 870         if (new_inode) {
 871
 872                 err = -ENOTEMPTY;
 873                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 874                         goto out_whiteout;
 875
 876                 err = -ENOENT;
 877                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 878                                                 &new_page);
 879                 if (!new_entry) {
 880                         if (IS_ERR(new_page))
 881                                 err = PTR_ERR(new_page);
 882                         goto out_whiteout;
 883                 }
 884
 885                 f2fs_balance_fs(sbi, true);
 886
 887                 f2fs_lock_op(sbi);
 888
 889                 err = acquire_orphan_inode(sbi);
 890                 if (err)
 891                         goto put_out_dir;
 892
 893                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 894
 895                 new_inode->i_ctime = current_time(new_inode);
 896                 down_write(&F2FS_I(new_inode)->i_sem);
 897                 if (old_dir_entry)
 898                         f2fs_i_links_write(new_inode, false);
 899                 f2fs_i_links_write(new_inode, false);
 900                 up_write(&F2FS_I(new_inode)->i_sem);
 901
 902                 if (!new_inode->i_nlink)
 903                         add_orphan_inode(new_inode);
 904                 else
 905                         release_orphan_inode(sbi);
 906         } else {
 907                 f2fs_balance_fs(sbi, true);
 908
 909                 f2fs_lock_op(sbi);
 910
 911                 err = f2fs_add_link(new_dentry, old_inode);
 912                 if (err) {
 913                         f2fs_unlock_op(sbi);
 914                         goto out_whiteout;
 915                 }
 916
 917                 if (old_dir_entry)
 918                         f2fs_i_links_write(new_dir, true);
 919
 920                 /*
 921                  * old entry and new entry can locate in the same inline
 922                  * dentry in inode, when attaching new entry in inline dentry,
 923                  * it could force inline dentry conversion, after that,
 924                  * old_entry and old_page will point to wrong address, in
 925                  * order to avoid this, let's do the check and update here.
 926                  */
 927                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 928                         f2fs_put_page(old_page, 0);
 929                         old_page = NULL;
 930
 931                         old_entry = f2fs_find_entry(old_dir,
 932                                                 &old_dentry->d_name, &old_page);
 933                         if (!old_entry) {
 934                                 err = -ENOENT;
 935                                 if (IS_ERR(old_page))
 936                                         err = PTR_ERR(old_page);
 937                                 f2fs_unlock_op(sbi);
 938                                 goto out_whiteout;
 939                         }
 940                 }
 941         }
 942
 943         down_write(&F2FS_I(old_inode)->i_sem);
 944         if (!old_dir_entry || whiteout)
 945                 file_lost_pino(old_inode);
 946         else
 947                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 948         up_write(&F2FS_I(old_inode)->i_sem);
 949
 950         old_inode->i_ctime = current_time(old_inode);
 951         f2fs_mark_inode_dirty_sync(old_inode, false);
 952
 953         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 954
 955         if (whiteout) {
 956                 whiteout->i_state |= I_LINKABLE;
 957                 set_inode_flag(whiteout, FI_INC_LINK);
 958                 err = f2fs_add_link(old_dentry, whiteout);
 959                 if (err)
 960                         goto put_out_dir;
 961                 whiteout->i_state &= ~I_LINKABLE;
 962                 iput(whiteout);
 963         }
 964
 965         if (old_dir_entry) {
 966                 if (old_dir != new_dir && !whiteout)
 967                         f2fs_set_link(old_inode, old_dir_entry,
 968                                                 old_dir_page, new_dir);
 969                 else
 970                         f2fs_put_page(old_dir_page, 0);
 971                 f2fs_i_links_write(old_dir, false);
 972         }
 973         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
 974                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 975
 976         f2fs_unlock_op(sbi);
 977
 978         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 979                 f2fs_sync_fs(sbi->sb, 1);
 980         return 0;
 981
 982 put_out_dir:
 983         f2fs_unlock_op(sbi);
 984         if (new_page)
 985                 f2fs_put_page(new_page, 0);
 986 out_whiteout:
 987         if (whiteout)
 988                 iput(whiteout);
 989 out_dir:
 990         if (old_dir_entry)
 991                 f2fs_put_page(old_dir_page, 0);
 992 out_old:
 993         f2fs_put_page(old_page, 0);
 994 out:
 995         return err;
 996 }
 997
 998 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 999                              struct inode *new_dir, struct dentry *new_dentry)
1000 {
1001         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1002         struct inode *old_inode = d_inode(old_dentry);
1003         struct inode *new_inode = d_inode(new_dentry);
1004         struct page *old_dir_page, *new_dir_page;
1005         struct page *old_page, *new_page;
1006         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1007         struct f2fs_dir_entry *old_entry, *new_entry;
1008         int old_nlink = 0, new_nlink = 0;
1009         int err = -ENOENT;
1010
1011         if (unlikely(f2fs_cp_error(sbi)))
1012                 return -EIO;
1013
1014         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1015                         !projid_eq(F2FS_I(new_dir)->i_projid,
1016                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1017             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1018                         !projid_eq(F2FS_I(old_dir)->i_projid,
1019                         F2FS_I(new_dentry->d_inode)->i_projid)))
1020                 return -EXDEV;
1021
1022         err = dquot_initialize(old_dir);
1023         if (err)
1024                 goto out;
1025
1026         err = dquot_initialize(new_dir);
1027         if (err)
1028                 goto out;
1029
1030         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1031         if (!old_entry) {
1032                 if (IS_ERR(old_page))
1033                         err = PTR_ERR(old_page);
1034                 goto out;
1035         }
1036
1037         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1038         if (!new_entry) {
1039                 if (IS_ERR(new_page))
1040                         err = PTR_ERR(new_page);
1041                 goto out_old;
1042         }
1043
1044         /* prepare for updating ".." directory entry info later */
1045         if (old_dir != new_dir) {
1046                 if (S_ISDIR(old_inode->i_mode)) {
1047                         old_dir_entry = f2fs_parent_dir(old_inode,
1048                                                         &old_dir_page);
1049                         if (!old_dir_entry) {
1050                                 if (IS_ERR(old_dir_page))
1051                                         err = PTR_ERR(old_dir_page);
1052                                 goto out_new;
1053                         }
1054                 }
1055
1056                 if (S_ISDIR(new_inode->i_mode)) {
1057                         new_dir_entry = f2fs_parent_dir(new_inode,
1058                                                         &new_dir_page);
1059                         if (!new_dir_entry) {
1060                                 if (IS_ERR(new_dir_page))
1061                                         err = PTR_ERR(new_dir_page);
1062                                 goto out_old_dir;
1063                         }
1064                 }
1065         }
1066
1067         /*
1068          * If cross rename between file and directory those are not
1069          * in the same directory, we will inc nlink of file's parent
1070          * later, so we should check upper boundary of its nlink.
1071          */
1072         if ((!old_dir_entry || !new_dir_entry) &&
1073                                 old_dir_entry != new_dir_entry) {
1074                 old_nlink = old_dir_entry ? -1 : 1;
1075                 new_nlink = -old_nlink;
1076                 err = -EMLINK;
1077                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1078                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1079                         goto out_new_dir;
1080         }
1081
1082         f2fs_balance_fs(sbi, true);
1083
1084         f2fs_lock_op(sbi);
1085
1086         /* update ".." directory entry info of old dentry */
1087         if (old_dir_entry)
1088                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1089
1090         /* update ".." directory entry info of new dentry */
1091         if (new_dir_entry)
1092                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1093
1094         /* update directory entry info of old dir inode */
1095         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1096
1097         down_write(&F2FS_I(old_inode)->i_sem);
1098         file_lost_pino(old_inode);
1099         up_write(&F2FS_I(old_inode)->i_sem);
1100
1101         old_dir->i_ctime = current_time(old_dir);
1102         if (old_nlink) {
1103                 down_write(&F2FS_I(old_dir)->i_sem);
1104                 f2fs_i_links_write(old_dir, old_nlink > 0);
1105                 up_write(&F2FS_I(old_dir)->i_sem);
1106         }
1107         f2fs_mark_inode_dirty_sync(old_dir, false);
1108
1109         /* update directory entry info of new dir inode */
1110         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1111
1112         down_write(&F2FS_I(new_inode)->i_sem);
1113         file_lost_pino(new_inode);
1114         up_write(&F2FS_I(new_inode)->i_sem);
1115
1116         new_dir->i_ctime = current_time(new_dir);
1117         if (new_nlink) {
1118                 down_write(&F2FS_I(new_dir)->i_sem);
1119                 f2fs_i_links_write(new_dir, new_nlink > 0);
1120                 up_write(&F2FS_I(new_dir)->i_sem);
1121         }
1122         f2fs_mark_inode_dirty_sync(new_dir, false);
1123
1124         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1125                 add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1126                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1127         }
1128
1129         f2fs_unlock_op(sbi);
1130
1131         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1132                 f2fs_sync_fs(sbi->sb, 1);
1133         return 0;
1134 out_new_dir:
1135         if (new_dir_entry) {
1136                 f2fs_put_page(new_dir_page, 0);
1137         }
1138 out_old_dir:
1139         if (old_dir_entry) {
1140                 f2fs_put_page(old_dir_page, 0);
1141         }
1142 out_new:
1143         f2fs_put_page(new_page, 0);
1144 out_old:
1145         f2fs_put_page(old_page, 0);
1146 out:
1147         return err;
1148 }
1149
1150 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1151                         struct inode *new_dir, struct dentry *new_dentry,
1152                         unsigned int flags)
1153 {
1154         int err;
1155
1156         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1157                 return -EINVAL;
1158
1159         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1160                                      flags);
1161         if (err)
1162                 return err;
1163
1164         if (flags & RENAME_EXCHANGE) {
1165                 return f2fs_cross_rename(old_dir, old_dentry,
1166                                          new_dir, new_dentry);
1167         }
1168         /*
1169          * VFS has already handled the new dentry existence case,
1170          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1171          */
1172         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1173 }
1174
1175 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1176                                            struct inode *inode,
1177                                            struct delayed_call *done)
1178 {
1179         struct page *page;
1180         const char *target;
1181
1182         if (!dentry)
1183                 return ERR_PTR(-ECHILD);
1184
1185         page = read_mapping_page(inode->i_mapping, 0, NULL);
1186         if (IS_ERR(page))
1187                 return ERR_CAST(page);
1188
1189         target = fscrypt_get_symlink(inode, page_address(page),
1190                                      inode->i_sb->s_blocksize, done);
1191         put_page(page);
1192         return target;
1193 }
1194
1195 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1196         .get_link       = f2fs_encrypted_get_link,
1197         .getattr        = f2fs_getattr,
1198         .setattr        = f2fs_setattr,
1199 #ifdef CONFIG_F2FS_FS_XATTR
1200         .listxattr      = f2fs_listxattr,
1201 #endif
1202 };
1203
1204 const struct inode_operations f2fs_dir_inode_operations = {
1205         .create         = f2fs_create,
1206         .lookup         = f2fs_lookup,
1207         .link           = f2fs_link,
1208         .unlink         = f2fs_unlink,
1209         .symlink        = f2fs_symlink,
1210         .mkdir          = f2fs_mkdir,
1211         .rmdir          = f2fs_rmdir,
1212         .mknod          = f2fs_mknod,
1213         .rename         = f2fs_rename2,
1214         .tmpfile        = f2fs_tmpfile,
1215         .getattr        = f2fs_getattr,
1216         .setattr        = f2fs_setattr,
1217         .get_acl        = f2fs_get_acl,
1218         .set_acl        = f2fs_set_acl,
1219 #ifdef CONFIG_F2FS_FS_XATTR
1220         .listxattr      = f2fs_listxattr,
1221 #endif
1222 };
1223
1224 const struct inode_operations f2fs_symlink_inode_operations = {
1225         .get_link       = f2fs_get_link,
1226         .getattr        = f2fs_getattr,
1227         .setattr        = f2fs_setattr,
1228 #ifdef CONFIG_F2FS_FS_XATTR
1229         .listxattr      = f2fs_listxattr,
1230 #endif
1231 };
1232
1233 const struct inode_operations f2fs_special_inode_operations = {
1234         .getattr        = f2fs_getattr,
1235         .setattr        = f2fs_setattr,
1236         .get_acl        = f2fs_get_acl,
1237         .set_acl        = f2fs_set_acl,
1238 #ifdef CONFIG_F2FS_FS_XATTR
1239         .listxattr      = f2fs_listxattr,
1240 #endif
1241 };