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 = current_time(inode);
  54         inode->i_generation = sbi->s_next_generation++;
  55
  56         err = insert_inode_locked(inode);
  57         if (err) {
  58                 err = -EINVAL;
  59                 goto fail;
  60         }
  61
  62         if (f2fs_sb_has_project_quota(sbi->sb) &&
  63                 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
  64                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  65         else
  66                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  67                                                         F2FS_DEF_PROJID);
  68
  69         err = dquot_initialize(inode);
  70         if (err)
  71                 goto fail_drop;
  72
  73         err = dquot_alloc_inode(inode);
  74         if (err)
  75                 goto fail_drop;
  76
  77         /* If the directory encrypted, then we should encrypt the inode. */
  78         if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
  79                 f2fs_set_encrypted_inode(inode);
  80
  81         set_inode_flag(inode, FI_NEW_INODE);
  82
  83         if (f2fs_sb_has_extra_attr(sbi->sb)) {
  84                 set_inode_flag(inode, FI_EXTRA_ATTR);
  85                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  86         }
  87
  88         if (test_opt(sbi, INLINE_XATTR))
  89                 set_inode_flag(inode, FI_INLINE_XATTR);
  90
  91         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  92                 set_inode_flag(inode, FI_INLINE_DATA);
  93         if (f2fs_may_inline_dentry(inode))
  94                 set_inode_flag(inode, FI_INLINE_DENTRY);
  95
  96         if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
  97                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
  98                 if (f2fs_has_inline_xattr(inode))
  99                         xattr_size = sbi->inline_xattr_size;
 100                 /* Otherwise, will be 0 */
 101         } else if (f2fs_has_inline_xattr(inode) ||
 102                                 f2fs_has_inline_dentry(inode)) {
 103                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 104         }
 105         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 106
 107         f2fs_init_extent_tree(inode, NULL);
 108
 109         stat_inc_inline_xattr(inode);
 110         stat_inc_inline_inode(inode);
 111         stat_inc_inline_dir(inode);
 112
 113         F2FS_I(inode)->i_flags =
 114                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 115
 116         if (S_ISDIR(inode->i_mode))
 117                 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
 118
 119         if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
 120                 set_inode_flag(inode, FI_PROJ_INHERIT);
 121
 122         trace_f2fs_new_inode(inode, 0);
 123         return inode;
 124
 125 fail:
 126         trace_f2fs_new_inode(inode, err);
 127         make_bad_inode(inode);
 128         if (nid_free)
 129                 set_inode_flag(inode, FI_FREE_NID);
 130         iput(inode);
 131         return ERR_PTR(err);
 132 fail_drop:
 133         trace_f2fs_new_inode(inode, err);
 134         dquot_drop(inode);
 135         inode->i_flags |= S_NOQUOTA;
 136         if (nid_free)
 137                 set_inode_flag(inode, FI_FREE_NID);
 138         clear_nlink(inode);
 139         unlock_new_inode(inode);
 140         iput(inode);
 141         return ERR_PTR(err);
 142 }
 143
 144 static int is_multimedia_file(const unsigned char *s, const char *sub)
 145 {
 146         size_t slen = strlen(s);
 147         size_t sublen = strlen(sub);
 148         int i;
 149
 150         /*
 151          * filename format of multimedia file should be defined as:
 152          * "filename + '.' + extension + (optional: '.' + temp extension)".
 153          */
 154         if (slen < sublen + 2)
 155                 return 0;
 156
 157         for (i = 1; i < slen - sublen; i++) {
 158                 if (s[i] != '.')
 159                         continue;
 160                 if (!strncasecmp(s + i + 1, sub, sublen))
 161                         return 1;
 162         }
 163
 164         return 0;
 165 }
 166
 167 /*
 168  * Set multimedia files as cold files for hot/cold data separation
 169  */
 170 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
 171                 const unsigned char *name)
 172 {
 173         int i;
 174         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 175
 176         int count = le32_to_cpu(sbi->raw_super->extension_count);
 177         for (i = 0; i < count; i++) {
 178                 if (is_multimedia_file(name, extlist[i])) {
 179                         file_set_cold(inode);
 180                         break;
 181                 }
 182         }
 183 }
 184
 185 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 186                                                 bool excl)
 187 {
 188         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 189         struct inode *inode;
 190         nid_t ino = 0;
 191         int err;
 192
 193         if (unlikely(f2fs_cp_error(sbi)))
 194                 return -EIO;
 195
 196         err = dquot_initialize(dir);
 197         if (err)
 198                 return err;
 199
 200         inode = f2fs_new_inode(dir, mode);
 201         if (IS_ERR(inode))
 202                 return PTR_ERR(inode);
 203
 204         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 205                 set_cold_files(sbi, inode, dentry->d_name.name);
 206
 207         inode->i_op = &f2fs_file_inode_operations;
 208         inode->i_fop = &f2fs_file_operations;
 209         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 210         ino = inode->i_ino;
 211
 212         f2fs_lock_op(sbi);
 213         err = f2fs_add_link(dentry, inode);
 214         if (err)
 215                 goto out;
 216         f2fs_unlock_op(sbi);
 217
 218         alloc_nid_done(sbi, ino);
 219
 220         d_instantiate(dentry, inode);
 221         unlock_new_inode(inode);
 222
 223         if (IS_DIRSYNC(dir))
 224                 f2fs_sync_fs(sbi->sb, 1);
 225
 226         f2fs_balance_fs(sbi, true);
 227         return 0;
 228 out:
 229         handle_failed_inode(inode);
 230         return err;
 231 }
 232
 233 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 234                 struct dentry *dentry)
 235 {
 236         struct inode *inode = d_inode(old_dentry);
 237         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 238         int err;
 239
 240         if (unlikely(f2fs_cp_error(sbi)))
 241                 return -EIO;
 242
 243         if (f2fs_encrypted_inode(dir) &&
 244                         !fscrypt_has_permitted_context(dir, inode))
 245                 return -EPERM;
 246
 247         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 248                         (!projid_eq(F2FS_I(dir)->i_projid,
 249                         F2FS_I(old_dentry->d_inode)->i_projid)))
 250                 return -EXDEV;
 251
 252         err = dquot_initialize(dir);
 253         if (err)
 254                 return err;
 255
 256         f2fs_balance_fs(sbi, true);
 257
 258         inode->i_ctime = current_time(inode);
 259         ihold(inode);
 260
 261         set_inode_flag(inode, FI_INC_LINK);
 262         f2fs_lock_op(sbi);
 263         err = f2fs_add_link(dentry, inode);
 264         if (err)
 265                 goto out;
 266         f2fs_unlock_op(sbi);
 267
 268         d_instantiate(dentry, inode);
 269
 270         if (IS_DIRSYNC(dir))
 271                 f2fs_sync_fs(sbi->sb, 1);
 272         return 0;
 273 out:
 274         clear_inode_flag(inode, FI_INC_LINK);
 275         iput(inode);
 276         f2fs_unlock_op(sbi);
 277         return err;
 278 }
 279
 280 struct dentry *f2fs_get_parent(struct dentry *child)
 281 {
 282         struct qstr dotdot = QSTR_INIT("..", 2);
 283         struct page *page;
 284         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 285         if (!ino) {
 286                 if (IS_ERR(page))
 287                         return ERR_CAST(page);
 288                 return ERR_PTR(-ENOENT);
 289         }
 290         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 291 }
 292
 293 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 294 {
 295         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 296         struct qstr dot = QSTR_INIT(".", 1);
 297         struct qstr dotdot = QSTR_INIT("..", 2);
 298         struct f2fs_dir_entry *de;
 299         struct page *page;
 300         int err = 0;
 301
 302         if (f2fs_readonly(sbi->sb)) {
 303                 f2fs_msg(sbi->sb, KERN_INFO,
 304                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 305                         "in readonly mountpoint", dir->i_ino, pino);
 306                 return 0;
 307         }
 308
 309         err = dquot_initialize(dir);
 310         if (err)
 311                 return err;
 312
 313         f2fs_balance_fs(sbi, true);
 314
 315         f2fs_lock_op(sbi);
 316
 317         de = f2fs_find_entry(dir, &dot, &page);
 318         if (de) {
 319                 f2fs_dentry_kunmap(dir, page);
 320                 f2fs_put_page(page, 0);
 321         } else if (IS_ERR(page)) {
 322                 err = PTR_ERR(page);
 323                 goto out;
 324         } else {
 325                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 326                 if (err)
 327                         goto out;
 328         }
 329
 330         de = f2fs_find_entry(dir, &dotdot, &page);
 331         if (de) {
 332                 f2fs_dentry_kunmap(dir, page);
 333                 f2fs_put_page(page, 0);
 334         } else if (IS_ERR(page)) {
 335                 err = PTR_ERR(page);
 336         } else {
 337                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 338         }
 339 out:
 340         if (!err)
 341                 clear_inode_flag(dir, FI_INLINE_DOTS);
 342
 343         f2fs_unlock_op(sbi);
 344         return err;
 345 }
 346
 347 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 348                 unsigned int flags)
 349 {
 350         struct inode *inode = NULL;
 351         struct f2fs_dir_entry *de;
 352         struct page *page;
 353         struct dentry *new;
 354         nid_t ino = -1;
 355         int err = 0;
 356         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 357
 358         trace_f2fs_lookup_start(dir, dentry, flags);
 359
 360         if (f2fs_encrypted_inode(dir)) {
 361                 err = fscrypt_get_encryption_info(dir);
 362
 363                 /*
 364                  * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
 365                  * created while the directory was encrypted and we
 366                  * don't have access to the key.
 367                  */
 368                 if (fscrypt_has_encryption_key(dir))
 369                         fscrypt_set_encrypted_dentry(dentry);
 370                 fscrypt_set_d_op(dentry);
 371                 if (err && err != -ENOKEY)
 372                         goto out;
 373         }
 374
 375         if (dentry->d_name.len > F2FS_NAME_LEN) {
 376                 err = -ENAMETOOLONG;
 377                 goto out;
 378         }
 379
 380         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 381         if (!de) {
 382                 if (IS_ERR(page)) {
 383                         err = PTR_ERR(page);
 384                         goto out;
 385                 }
 386                 goto out_splice;
 387         }
 388
 389         ino = le32_to_cpu(de->ino);
 390         f2fs_dentry_kunmap(dir, page);
 391         f2fs_put_page(page, 0);
 392
 393         inode = f2fs_iget(dir->i_sb, ino);
 394         if (IS_ERR(inode)) {
 395                 err = PTR_ERR(inode);
 396                 goto out;
 397         }
 398
 399         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 400                 err = __recover_dot_dentries(dir, root_ino);
 401                 if (err)
 402                         goto out_iput;
 403         }
 404
 405         if (f2fs_has_inline_dots(inode)) {
 406                 err = __recover_dot_dentries(inode, dir->i_ino);
 407                 if (err)
 408                         goto out_iput;
 409         }
 410         if (f2fs_encrypted_inode(dir) &&
 411             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 412             !fscrypt_has_permitted_context(dir, inode)) {
 413                 f2fs_msg(inode->i_sb, KERN_WARNING,
 414                          "Inconsistent encryption contexts: %lu/%lu",
 415                          dir->i_ino, inode->i_ino);
 416                 err = -EPERM;
 417                 goto out_iput;
 418         }
 419 out_splice:
 420         new = d_splice_alias(inode, dentry);
 421         if (IS_ERR(new))
 422                 err = PTR_ERR(new);
 423         trace_f2fs_lookup_end(dir, dentry, ino, err);
 424         return new;
 425 out_iput:
 426         iput(inode);
 427 out:
 428         trace_f2fs_lookup_end(dir, dentry, ino, err);
 429         return ERR_PTR(err);
 430 }
 431
 432 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 433 {
 434         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 435         struct inode *inode = d_inode(dentry);
 436         struct f2fs_dir_entry *de;
 437         struct page *page;
 438         int err = -ENOENT;
 439
 440         trace_f2fs_unlink_enter(dir, dentry);
 441
 442         if (unlikely(f2fs_cp_error(sbi)))
 443                 return -EIO;
 444
 445         err = dquot_initialize(dir);
 446         if (err)
 447                 return err;
 448         err = dquot_initialize(inode);
 449         if (err)
 450                 return err;
 451
 452         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 453         if (!de) {
 454                 if (IS_ERR(page))
 455                         err = PTR_ERR(page);
 456                 goto fail;
 457         }
 458
 459         f2fs_balance_fs(sbi, true);
 460
 461         f2fs_lock_op(sbi);
 462         err = acquire_orphan_inode(sbi);
 463         if (err) {
 464                 f2fs_unlock_op(sbi);
 465                 f2fs_dentry_kunmap(dir, page);
 466                 f2fs_put_page(page, 0);
 467                 goto fail;
 468         }
 469         f2fs_delete_entry(de, page, dir, inode);
 470         f2fs_unlock_op(sbi);
 471
 472         if (IS_DIRSYNC(dir))
 473                 f2fs_sync_fs(sbi->sb, 1);
 474 fail:
 475         trace_f2fs_unlink_exit(inode, err);
 476         return err;
 477 }
 478
 479 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
 480 {
 481         const char *link = page_follow_link_light(dentry, cookie);
 482         if (!IS_ERR(link) && !*link) {
 483                 /* this is broken symlink case */
 484                 page_put_link(NULL, *cookie);
 485                 link = ERR_PTR(-ENOENT);
 486         }
 487         return link;
 488 }
 489
 490 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 491                                         const char *symname)
 492 {
 493         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 494         struct inode *inode;
 495         size_t len = strlen(symname);
 496         struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
 497         struct fscrypt_symlink_data *sd = NULL;
 498         int err;
 499
 500         if (unlikely(f2fs_cp_error(sbi)))
 501                 return -EIO;
 502
 503         if (f2fs_encrypted_inode(dir)) {
 504                 err = fscrypt_get_encryption_info(dir);
 505                 if (err)
 506                         return err;
 507
 508                 if (!fscrypt_has_encryption_key(dir))
 509                         return -ENOKEY;
 510
 511                 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
 512                                 sizeof(struct fscrypt_symlink_data));
 513         }
 514
 515         if (disk_link.len > dir->i_sb->s_blocksize)
 516                 return -ENAMETOOLONG;
 517
 518         err = dquot_initialize(dir);
 519         if (err)
 520                 return err;
 521
 522         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 523         if (IS_ERR(inode))
 524                 return PTR_ERR(inode);
 525
 526         if (f2fs_encrypted_inode(inode))
 527                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 528         else
 529                 inode->i_op = &f2fs_symlink_inode_operations;
 530         inode_nohighmem(inode);
 531         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 532
 533         f2fs_lock_op(sbi);
 534         err = f2fs_add_link(dentry, inode);
 535         if (err)
 536                 goto out;
 537         f2fs_unlock_op(sbi);
 538         alloc_nid_done(sbi, inode->i_ino);
 539
 540         if (f2fs_encrypted_inode(inode)) {
 541                 struct qstr istr = QSTR_INIT(symname, len);
 542                 struct fscrypt_str ostr;
 543
 544                 sd = kzalloc(disk_link.len, GFP_NOFS);
 545                 if (!sd) {
 546                         err = -ENOMEM;
 547                         goto err_out;
 548                 }
 549
 550                 err = fscrypt_get_encryption_info(inode);
 551                 if (err)
 552                         goto err_out;
 553
 554                 if (!fscrypt_has_encryption_key(inode)) {
 555                         err = -ENOKEY;
 556                         goto err_out;
 557                 }
 558
 559                 ostr.name = sd->encrypted_path;
 560                 ostr.len = disk_link.len;
 561                 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
 562                 if (err)
 563                         goto err_out;
 564
 565                 sd->len = cpu_to_le16(ostr.len);
 566                 disk_link.name = (char *)sd;
 567         }
 568
 569         err = page_symlink(inode, disk_link.name, disk_link.len);
 570
 571 err_out:
 572         d_instantiate(dentry, inode);
 573         unlock_new_inode(inode);
 574
 575         /*
 576          * Let's flush symlink data in order to avoid broken symlink as much as
 577          * possible. Nevertheless, fsyncing is the best way, but there is no
 578          * way to get a file descriptor in order to flush that.
 579          *
 580          * Note that, it needs to do dir->fsync to make this recoverable.
 581          * If the symlink path is stored into inline_data, there is no
 582          * performance regression.
 583          */
 584         if (!err) {
 585                 filemap_write_and_wait_range(inode->i_mapping, 0,
 586                                                         disk_link.len - 1);
 587
 588                 if (IS_DIRSYNC(dir))
 589                         f2fs_sync_fs(sbi->sb, 1);
 590         } else {
 591                 f2fs_unlink(dir, dentry);
 592         }
 593
 594         kfree(sd);
 595
 596         f2fs_balance_fs(sbi, true);
 597         return err;
 598 out:
 599         handle_failed_inode(inode);
 600         return err;
 601 }
 602
 603 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 604 {
 605         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 606         struct inode *inode;
 607         int err;
 608
 609         if (unlikely(f2fs_cp_error(sbi)))
 610                 return -EIO;
 611
 612         err = dquot_initialize(dir);
 613         if (err)
 614                 return err;
 615
 616         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 617         if (IS_ERR(inode))
 618                 return PTR_ERR(inode);
 619
 620         inode->i_op = &f2fs_dir_inode_operations;
 621         inode->i_fop = &f2fs_dir_operations;
 622         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 623         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 624
 625         set_inode_flag(inode, FI_INC_LINK);
 626         f2fs_lock_op(sbi);
 627         err = f2fs_add_link(dentry, inode);
 628         if (err)
 629                 goto out_fail;
 630         f2fs_unlock_op(sbi);
 631
 632         alloc_nid_done(sbi, inode->i_ino);
 633
 634         d_instantiate(dentry, inode);
 635         unlock_new_inode(inode);
 636
 637         if (IS_DIRSYNC(dir))
 638                 f2fs_sync_fs(sbi->sb, 1);
 639
 640         f2fs_balance_fs(sbi, true);
 641         return 0;
 642
 643 out_fail:
 644         clear_inode_flag(inode, FI_INC_LINK);
 645         handle_failed_inode(inode);
 646         return err;
 647 }
 648
 649 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 650 {
 651         struct inode *inode = d_inode(dentry);
 652         if (f2fs_empty_dir(inode))
 653                 return f2fs_unlink(dir, dentry);
 654         return -ENOTEMPTY;
 655 }
 656
 657 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 658                                 umode_t mode, dev_t rdev)
 659 {
 660         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 661         struct inode *inode;
 662         int err = 0;
 663
 664         if (unlikely(f2fs_cp_error(sbi)))
 665                 return -EIO;
 666
 667         err = dquot_initialize(dir);
 668         if (err)
 669                 return err;
 670
 671         inode = f2fs_new_inode(dir, mode);
 672         if (IS_ERR(inode))
 673                 return PTR_ERR(inode);
 674
 675         init_special_inode(inode, inode->i_mode, rdev);
 676         inode->i_op = &f2fs_special_inode_operations;
 677
 678         f2fs_lock_op(sbi);
 679         err = f2fs_add_link(dentry, inode);
 680         if (err)
 681                 goto out;
 682         f2fs_unlock_op(sbi);
 683
 684         alloc_nid_done(sbi, inode->i_ino);
 685
 686         d_instantiate(dentry, inode);
 687         unlock_new_inode(inode);
 688
 689         if (IS_DIRSYNC(dir))
 690                 f2fs_sync_fs(sbi->sb, 1);
 691
 692         f2fs_balance_fs(sbi, true);
 693         return 0;
 694 out:
 695         handle_failed_inode(inode);
 696         return err;
 697 }
 698
 699 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 700                                         umode_t mode, struct inode **whiteout)
 701 {
 702         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 703         struct inode *inode;
 704         int err;
 705
 706         err = dquot_initialize(dir);
 707         if (err)
 708                 return err;
 709
 710         inode = f2fs_new_inode(dir, mode);
 711         if (IS_ERR(inode))
 712                 return PTR_ERR(inode);
 713
 714         if (whiteout) {
 715                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 716                 inode->i_op = &f2fs_special_inode_operations;
 717         } else {
 718                 inode->i_op = &f2fs_file_inode_operations;
 719                 inode->i_fop = &f2fs_file_operations;
 720                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 721         }
 722
 723         f2fs_lock_op(sbi);
 724         err = acquire_orphan_inode(sbi);
 725         if (err)
 726                 goto out;
 727
 728         err = f2fs_do_tmpfile(inode, dir);
 729         if (err)
 730                 goto release_out;
 731
 732         /*
 733          * add this non-linked tmpfile to orphan list, in this way we could
 734          * remove all unused data of tmpfile after abnormal power-off.
 735          */
 736         add_orphan_inode(inode);
 737         alloc_nid_done(sbi, inode->i_ino);
 738
 739         if (whiteout) {
 740                 f2fs_i_links_write(inode, false);
 741                 *whiteout = inode;
 742         } else {
 743                 d_tmpfile(dentry, inode);
 744         }
 745         /* link_count was changed by d_tmpfile as well. */
 746         f2fs_unlock_op(sbi);
 747         unlock_new_inode(inode);
 748
 749         f2fs_balance_fs(sbi, true);
 750         return 0;
 751
 752 release_out:
 753         release_orphan_inode(sbi);
 754 out:
 755         handle_failed_inode(inode);
 756         return err;
 757 }
 758
 759 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 760 {
 761         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 762                 return -EIO;
 763
 764         if (f2fs_encrypted_inode(dir)) {
 765                 int err = fscrypt_get_encryption_info(dir);
 766                 if (err)
 767                         return err;
 768         }
 769
 770         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 771 }
 772
 773 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 774 {
 775         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 776                 return -EIO;
 777
 778         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 779 }
 780
 781 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 782                         struct inode *new_dir, struct dentry *new_dentry,
 783                         unsigned int flags)
 784 {
 785         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 786         struct inode *old_inode = d_inode(old_dentry);
 787         struct inode *new_inode = d_inode(new_dentry);
 788         struct inode *whiteout = NULL;
 789         struct page *old_dir_page;
 790         struct page *old_page, *new_page = NULL;
 791         struct f2fs_dir_entry *old_dir_entry = NULL;
 792         struct f2fs_dir_entry *old_entry;
 793         struct f2fs_dir_entry *new_entry;
 794         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 795         int err = -ENOENT;
 796
 797         if (unlikely(f2fs_cp_error(sbi)))
 798                 return -EIO;
 799
 800         if ((f2fs_encrypted_inode(old_dir) &&
 801                         !fscrypt_has_encryption_key(old_dir)) ||
 802                         (f2fs_encrypted_inode(new_dir) &&
 803                         !fscrypt_has_encryption_key(new_dir)))
 804                 return -ENOKEY;
 805
 806         if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
 807                         !fscrypt_has_permitted_context(new_dir, old_inode)) {
 808                 err = -EPERM;
 809                 goto out;
 810         }
 811
 812         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 813                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 814                         F2FS_I(old_dentry->d_inode)->i_projid)))
 815                 return -EXDEV;
 816
 817         err = dquot_initialize(old_dir);
 818         if (err)
 819                 goto out;
 820
 821         err = dquot_initialize(new_dir);
 822         if (err)
 823                 goto out;
 824
 825         if (new_inode) {
 826                 err = dquot_initialize(new_inode);
 827                 if (err)
 828                         goto out;
 829         }
 830
 831         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 832         if (!old_entry) {
 833                 if (IS_ERR(old_page))
 834                         err = PTR_ERR(old_page);
 835                 goto out;
 836         }
 837
 838         if (S_ISDIR(old_inode->i_mode)) {
 839                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 840                 if (!old_dir_entry) {
 841                         if (IS_ERR(old_dir_page))
 842                                 err = PTR_ERR(old_dir_page);
 843                         goto out_old;
 844                 }
 845         }
 846
 847         if (flags & RENAME_WHITEOUT) {
 848                 err = f2fs_create_whiteout(old_dir, &whiteout);
 849                 if (err)
 850                         goto out_dir;
 851         }
 852
 853         if (new_inode) {
 854
 855                 err = -ENOTEMPTY;
 856                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 857                         goto out_whiteout;
 858
 859                 err = -ENOENT;
 860                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 861                                                 &new_page);
 862                 if (!new_entry) {
 863                         if (IS_ERR(new_page))
 864                                 err = PTR_ERR(new_page);
 865                         goto out_whiteout;
 866                 }
 867
 868                 f2fs_balance_fs(sbi, true);
 869
 870                 f2fs_lock_op(sbi);
 871
 872                 err = acquire_orphan_inode(sbi);
 873                 if (err)
 874                         goto put_out_dir;
 875
 876                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 877
 878                 new_inode->i_ctime = current_time(new_inode);
 879                 down_write(&F2FS_I(new_inode)->i_sem);
 880                 if (old_dir_entry)
 881                         f2fs_i_links_write(new_inode, false);
 882                 f2fs_i_links_write(new_inode, false);
 883                 up_write(&F2FS_I(new_inode)->i_sem);
 884
 885                 if (!new_inode->i_nlink)
 886                         add_orphan_inode(new_inode);
 887                 else
 888                         release_orphan_inode(sbi);
 889         } else {
 890                 f2fs_balance_fs(sbi, true);
 891
 892                 f2fs_lock_op(sbi);
 893
 894                 err = f2fs_add_link(new_dentry, old_inode);
 895                 if (err) {
 896                         f2fs_unlock_op(sbi);
 897                         goto out_whiteout;
 898                 }
 899
 900                 if (old_dir_entry)
 901                         f2fs_i_links_write(new_dir, true);
 902
 903                 /*
 904                  * old entry and new entry can locate in the same inline
 905                  * dentry in inode, when attaching new entry in inline dentry,
 906                  * it could force inline dentry conversion, after that,
 907                  * old_entry and old_page will point to wrong address, in
 908                  * order to avoid this, let's do the check and update here.
 909                  */
 910                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 911                         f2fs_put_page(old_page, 0);
 912                         old_page = NULL;
 913
 914                         old_entry = f2fs_find_entry(old_dir,
 915                                                 &old_dentry->d_name, &old_page);
 916                         if (!old_entry) {
 917                                 err = -ENOENT;
 918                                 if (IS_ERR(old_page))
 919                                         err = PTR_ERR(old_page);
 920                                 f2fs_unlock_op(sbi);
 921                                 goto out_whiteout;
 922                         }
 923                 }
 924         }
 925
 926         down_write(&F2FS_I(old_inode)->i_sem);
 927         if (!old_dir_entry || whiteout)
 928                 file_lost_pino(old_inode);
 929         else
 930                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 931         up_write(&F2FS_I(old_inode)->i_sem);
 932
 933         old_inode->i_ctime = current_time(old_inode);
 934         f2fs_mark_inode_dirty_sync(old_inode, false);
 935
 936         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 937
 938         if (whiteout) {
 939                 whiteout->i_state |= I_LINKABLE;
 940                 set_inode_flag(whiteout, FI_INC_LINK);
 941                 err = f2fs_add_link(old_dentry, whiteout);
 942                 if (err)
 943                         goto put_out_dir;
 944                 whiteout->i_state &= ~I_LINKABLE;
 945                 iput(whiteout);
 946         }
 947
 948         if (old_dir_entry) {
 949                 if (old_dir != new_dir && !whiteout) {
 950                         f2fs_set_link(old_inode, old_dir_entry,
 951                                                 old_dir_page, new_dir);
 952                 } else {
 953                         f2fs_dentry_kunmap(old_inode, old_dir_page);
 954                         f2fs_put_page(old_dir_page, 0);
 955                 }
 956                 f2fs_i_links_write(old_dir, false);
 957         }
 958
 959         f2fs_unlock_op(sbi);
 960
 961         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 962                 f2fs_sync_fs(sbi->sb, 1);
 963         return 0;
 964
 965 put_out_dir:
 966         f2fs_unlock_op(sbi);
 967         if (new_page) {
 968                 f2fs_dentry_kunmap(new_dir, new_page);
 969                 f2fs_put_page(new_page, 0);
 970         }
 971 out_whiteout:
 972         if (whiteout)
 973                 iput(whiteout);
 974 out_dir:
 975         if (old_dir_entry) {
 976                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 977                 f2fs_put_page(old_dir_page, 0);
 978         }
 979 out_old:
 980         f2fs_dentry_kunmap(old_dir, old_page);
 981         f2fs_put_page(old_page, 0);
 982 out:
 983         return err;
 984 }
 985
 986 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 987                              struct inode *new_dir, struct dentry *new_dentry)
 988 {
 989         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 990         struct inode *old_inode = d_inode(old_dentry);
 991         struct inode *new_inode = d_inode(new_dentry);
 992         struct page *old_dir_page, *new_dir_page;
 993         struct page *old_page, *new_page;
 994         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
 995         struct f2fs_dir_entry *old_entry, *new_entry;
 996         int old_nlink = 0, new_nlink = 0;
 997         int err = -ENOENT;
 998
 999         if (unlikely(f2fs_cp_error(sbi)))
1000                 return -EIO;
1001
1002         if ((f2fs_encrypted_inode(old_dir) &&
1003                         !fscrypt_has_encryption_key(old_dir)) ||
1004                         (f2fs_encrypted_inode(new_dir) &&
1005                         !fscrypt_has_encryption_key(new_dir)))
1006                 return -ENOKEY;
1007
1008         if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
1009                         (old_dir != new_dir) &&
1010                         (!fscrypt_has_permitted_context(new_dir, old_inode) ||
1011                          !fscrypt_has_permitted_context(old_dir, new_inode)))
1012                 return -EPERM;
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         f2fs_unlock_op(sbi);
1125
1126         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1127                 f2fs_sync_fs(sbi->sb, 1);
1128         return 0;
1129 out_new_dir:
1130         if (new_dir_entry) {
1131                 f2fs_dentry_kunmap(new_inode, new_dir_page);
1132                 f2fs_put_page(new_dir_page, 0);
1133         }
1134 out_old_dir:
1135         if (old_dir_entry) {
1136                 f2fs_dentry_kunmap(old_inode, old_dir_page);
1137                 f2fs_put_page(old_dir_page, 0);
1138         }
1139 out_new:
1140         f2fs_dentry_kunmap(new_dir, new_page);
1141         f2fs_put_page(new_page, 0);
1142 out_old:
1143         f2fs_dentry_kunmap(old_dir, old_page);
1144         f2fs_put_page(old_page, 0);
1145 out:
1146         return err;
1147 }
1148
1149 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1150                         struct inode *new_dir, struct dentry *new_dentry,
1151                         unsigned int flags)
1152 {
1153         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1154                 return -EINVAL;
1155
1156         if (flags & RENAME_EXCHANGE) {
1157                 return f2fs_cross_rename(old_dir, old_dentry,
1158                                          new_dir, new_dentry);
1159         }
1160         /*
1161          * VFS has already handled the new dentry existence case,
1162          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1163          */
1164         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1165 }
1166
1167 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1168 {
1169         struct page *cpage = NULL;
1170         char *caddr, *paddr = NULL;
1171         struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1172         struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1173         struct fscrypt_symlink_data *sd;
1174         struct inode *inode = d_inode(dentry);
1175         u32 max_size = inode->i_sb->s_blocksize;
1176         int res;
1177
1178         res = fscrypt_get_encryption_info(inode);
1179         if (res)
1180                 return ERR_PTR(res);
1181
1182         cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1183         if (IS_ERR(cpage))
1184                 return ERR_CAST(cpage);
1185         caddr = page_address(cpage);
1186
1187         /* Symlink is encrypted */
1188         sd = (struct fscrypt_symlink_data *)caddr;
1189         cstr.name = sd->encrypted_path;
1190         cstr.len = le16_to_cpu(sd->len);
1191
1192         /* this is broken symlink case */
1193         if (unlikely(cstr.len == 0)) {
1194                 res = -ENOENT;
1195                 goto errout;
1196         }
1197
1198         if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1199                 /* Symlink data on the disk is corrupted */
1200                 res = -EIO;
1201                 goto errout;
1202         }
1203         res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1204         if (res)
1205                 goto errout;
1206
1207         res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1208         if (res)
1209                 goto errout;
1210
1211         /* this is broken symlink case */
1212         if (unlikely(pstr.name[0] == 0)) {
1213                 res = -ENOENT;
1214                 goto errout;
1215         }
1216
1217         paddr = pstr.name;
1218
1219         /* Null-terminate the name */
1220         paddr[pstr.len] = '\0';
1221
1222         put_page(cpage);
1223         return *cookie = paddr;
1224 errout:
1225         fscrypt_fname_free_buffer(&pstr);
1226         put_page(cpage);
1227         return ERR_PTR(res);
1228 }
1229
1230 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1231         .readlink       = generic_readlink,
1232         .follow_link    = f2fs_encrypted_follow_link,
1233         .put_link       = kfree_put_link,
1234         .getattr        = f2fs_getattr,
1235         .setattr        = f2fs_setattr,
1236 #ifdef CONFIG_F2FS_FS_XATTR
1237         .setxattr       = generic_setxattr,
1238         .getxattr       = generic_getxattr,
1239         .listxattr      = f2fs_listxattr,
1240         .removexattr    = generic_removexattr,
1241 #endif
1242 };
1243
1244 const struct inode_operations f2fs_dir_inode_operations = {
1245         .create         = f2fs_create,
1246         .lookup         = f2fs_lookup,
1247         .link           = f2fs_link,
1248         .unlink         = f2fs_unlink,
1249         .symlink        = f2fs_symlink,
1250         .mkdir          = f2fs_mkdir,
1251         .rmdir          = f2fs_rmdir,
1252         .mknod          = f2fs_mknod,
1253         .rename2        = f2fs_rename2,
1254         .tmpfile        = f2fs_tmpfile,
1255         .getattr        = f2fs_getattr,
1256         .setattr        = f2fs_setattr,
1257         .get_acl        = f2fs_get_acl,
1258         .set_acl        = f2fs_set_acl,
1259 #ifdef CONFIG_F2FS_FS_XATTR
1260         .setxattr       = generic_setxattr,
1261         .getxattr       = generic_getxattr,
1262         .listxattr      = f2fs_listxattr,
1263         .removexattr    = generic_removexattr,
1264 #endif
1265 };
1266
1267 const struct inode_operations f2fs_symlink_inode_operations = {
1268         .readlink       = generic_readlink,
1269         .follow_link    = f2fs_follow_link,
1270         .put_link       = page_put_link,
1271         .getattr        = f2fs_getattr,
1272         .setattr        = f2fs_setattr,
1273 #ifdef CONFIG_F2FS_FS_XATTR
1274         .setxattr       = generic_setxattr,
1275         .getxattr       = generic_getxattr,
1276         .listxattr      = f2fs_listxattr,
1277         .removexattr    = generic_removexattr,
1278 #endif
1279 };
1280
1281 const struct inode_operations f2fs_special_inode_operations = {
1282         .getattr        = f2fs_getattr,
1283         .setattr        = f2fs_setattr,
1284         .get_acl        = f2fs_get_acl,
1285         .set_acl        = f2fs_set_acl,
1286 #ifdef CONFIG_F2FS_FS_XATTR
1287         .setxattr       = generic_setxattr,
1288         .getxattr       = generic_getxattr,
1289         .listxattr      = f2fs_listxattr,
1290         .removexattr    = generic_removexattr,
1291 #endif
1292 };