1 /* 2 * fs/f2fs/namei.c 3 * 4 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #include <linux/fs.h> 12 #include <linux/f2fs_fs.h> 13 #include <linux/pagemap.h> 14 #include <linux/sched.h> 15 #include <linux/ctype.h> 16 #include <linux/dcache.h> 17 #include <linux/namei.h> 18 #include <linux/quotaops.h> 19 20 #include "f2fs.h" 21 #include "node.h" 22 #include "xattr.h" 23 #include "acl.h" 24 #include <trace/events/f2fs.h> 25 26 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) 27 { 28 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 29 nid_t ino; 30 struct inode *inode; 31 bool nid_free = false; 32 int xattr_size = 0; 33 int err; 34 35 inode = new_inode(dir->i_sb); 36 if (!inode) 37 return ERR_PTR(-ENOMEM); 38 39 f2fs_lock_op(sbi); 40 if (!alloc_nid(sbi, &ino)) { 41 f2fs_unlock_op(sbi); 42 err = -ENOSPC; 43 goto fail; 44 } 45 f2fs_unlock_op(sbi); 46 47 nid_free = true; 48 49 inode_init_owner(inode, dir, mode); 50 51 inode->i_ino = ino; 52 inode->i_blocks = 0; 53 inode->i_mtime = inode->i_atime = inode->i_ctime = 54 F2FS_I(inode)->i_crtime = current_time(inode); 55 inode->i_generation = sbi->s_next_generation++; 56 57 err = insert_inode_locked(inode); 58 if (err) { 59 err = -EINVAL; 60 goto fail; 61 } 62 63 if (f2fs_sb_has_project_quota(sbi->sb) && 64 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL)) 65 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid; 66 else 67 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns, 68 F2FS_DEF_PROJID); 69 70 err = dquot_initialize(inode); 71 if (err) 72 goto fail_drop; 73 74 err = dquot_alloc_inode(inode); 75 if (err) 76 goto fail_drop; 77 78 set_inode_flag(inode, FI_NEW_INODE); 79 80 /* If the directory encrypted, then we should encrypt the inode. */ 81 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) 82 f2fs_set_encrypted_inode(inode); 83 84 if (f2fs_sb_has_extra_attr(sbi->sb)) { 85 set_inode_flag(inode, FI_EXTRA_ATTR); 86 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE; 87 } 88 89 if (test_opt(sbi, INLINE_XATTR)) 90 set_inode_flag(inode, FI_INLINE_XATTR); 91 92 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode)) 93 set_inode_flag(inode, FI_INLINE_DATA); 94 if (f2fs_may_inline_dentry(inode)) 95 set_inode_flag(inode, FI_INLINE_DENTRY); 96 97 if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) { 98 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode)); 99 if (f2fs_has_inline_xattr(inode)) 100 xattr_size = sbi->inline_xattr_size; 101 /* Otherwise, will be 0 */ 102 } else if (f2fs_has_inline_xattr(inode) || 103 f2fs_has_inline_dentry(inode)) { 104 xattr_size = DEFAULT_INLINE_XATTR_ADDRS; 105 } 106 F2FS_I(inode)->i_inline_xattr_size = xattr_size; 107 108 f2fs_init_extent_tree(inode, NULL); 109 110 stat_inc_inline_xattr(inode); 111 stat_inc_inline_inode(inode); 112 stat_inc_inline_dir(inode); 113 114 F2FS_I(inode)->i_flags = 115 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED); 116 117 if (S_ISDIR(inode->i_mode)) 118 F2FS_I(inode)->i_flags |= FS_INDEX_FL; 119 120 if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL) 121 set_inode_flag(inode, FI_PROJ_INHERIT); 122 123 trace_f2fs_new_inode(inode, 0); 124 return inode; 125 126 fail: 127 trace_f2fs_new_inode(inode, err); 128 make_bad_inode(inode); 129 if (nid_free) 130 set_inode_flag(inode, FI_FREE_NID); 131 iput(inode); 132 return ERR_PTR(err); 133 fail_drop: 134 trace_f2fs_new_inode(inode, err); 135 dquot_drop(inode); 136 inode->i_flags |= S_NOQUOTA; 137 if (nid_free) 138 set_inode_flag(inode, FI_FREE_NID); 139 clear_nlink(inode); 140 unlock_new_inode(inode); 141 iput(inode); 142 return ERR_PTR(err); 143 } 144 145 static int is_multimedia_file(const unsigned char *s, const char *sub) 146 { 147 size_t slen = strlen(s); 148 size_t sublen = strlen(sub); 149 int i; 150 151 /* 152 * filename format of multimedia file should be defined as: 153 * "filename + '.' + extension + (optional: '.' + temp extension)". 154 */ 155 if (slen < sublen + 2) 156 return 0; 157 158 for (i = 1; i < slen - sublen; i++) { 159 if (s[i] != '.') 160 continue; 161 if (!strncasecmp(s + i + 1, sub, sublen)) 162 return 1; 163 } 164 165 return 0; 166 } 167 168 /* 169 * Set multimedia files as cold files for hot/cold data separation 170 */ 171 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode, 172 const unsigned char *name) 173 { 174 int i; 175 __u8 (*extlist)[8] = sbi->raw_super->extension_list; 176 177 int count = le32_to_cpu(sbi->raw_super->extension_count); 178 for (i = 0; i < count; i++) { 179 if (is_multimedia_file(name, extlist[i])) { 180 file_set_cold(inode); 181 break; 182 } 183 } 184 } 185 186 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 187 bool excl) 188 { 189 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 190 struct inode *inode; 191 nid_t ino = 0; 192 int err; 193 194 if (unlikely(f2fs_cp_error(sbi))) 195 return -EIO; 196 197 err = dquot_initialize(dir); 198 if (err) 199 return err; 200 201 inode = f2fs_new_inode(dir, mode); 202 if (IS_ERR(inode)) 203 return PTR_ERR(inode); 204 205 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) 206 set_cold_files(sbi, inode, dentry->d_name.name); 207 208 inode->i_op = &f2fs_file_inode_operations; 209 inode->i_fop = &f2fs_file_operations; 210 inode->i_mapping->a_ops = &f2fs_dblock_aops; 211 ino = inode->i_ino; 212 213 f2fs_lock_op(sbi); 214 err = f2fs_add_link(dentry, inode); 215 if (err) 216 goto out; 217 f2fs_unlock_op(sbi); 218 219 alloc_nid_done(sbi, ino); 220 221 d_instantiate(dentry, inode); 222 unlock_new_inode(inode); 223 224 if (IS_DIRSYNC(dir)) 225 f2fs_sync_fs(sbi->sb, 1); 226 227 f2fs_balance_fs(sbi, true); 228 return 0; 229 out: 230 handle_failed_inode(inode); 231 return err; 232 } 233 234 static int f2fs_link(struct dentry *old_dentry, struct inode *dir, 235 struct dentry *dentry) 236 { 237 struct inode *inode = d_inode(old_dentry); 238 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 239 int err; 240 241 if (unlikely(f2fs_cp_error(sbi))) 242 return -EIO; 243 244 err = fscrypt_prepare_link(old_dentry, dir, dentry); 245 if (err) 246 return err; 247 248 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) && 249 (!projid_eq(F2FS_I(dir)->i_projid, 250 F2FS_I(old_dentry->d_inode)->i_projid))) 251 return -EXDEV; 252 253 err = dquot_initialize(dir); 254 if (err) 255 return err; 256 257 f2fs_balance_fs(sbi, true); 258 259 inode->i_ctime = current_time(inode); 260 ihold(inode); 261 262 set_inode_flag(inode, FI_INC_LINK); 263 f2fs_lock_op(sbi); 264 err = f2fs_add_link(dentry, inode); 265 if (err) 266 goto out; 267 f2fs_unlock_op(sbi); 268 269 d_instantiate(dentry, inode); 270 271 if (IS_DIRSYNC(dir)) 272 f2fs_sync_fs(sbi->sb, 1); 273 return 0; 274 out: 275 clear_inode_flag(inode, FI_INC_LINK); 276 iput(inode); 277 f2fs_unlock_op(sbi); 278 return err; 279 } 280 281 struct dentry *f2fs_get_parent(struct dentry *child) 282 { 283 struct qstr dotdot = QSTR_INIT("..", 2); 284 struct page *page; 285 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page); 286 if (!ino) { 287 if (IS_ERR(page)) 288 return ERR_CAST(page); 289 return ERR_PTR(-ENOENT); 290 } 291 return d_obtain_alias(f2fs_iget(child->d_sb, ino)); 292 } 293 294 static int __recover_dot_dentries(struct inode *dir, nid_t pino) 295 { 296 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 297 struct qstr dot = QSTR_INIT(".", 1); 298 struct qstr dotdot = QSTR_INIT("..", 2); 299 struct f2fs_dir_entry *de; 300 struct page *page; 301 int err = 0; 302 303 if (f2fs_readonly(sbi->sb)) { 304 f2fs_msg(sbi->sb, KERN_INFO, 305 "skip recovering inline_dots inode (ino:%lu, pino:%u) " 306 "in readonly mountpoint", dir->i_ino, pino); 307 return 0; 308 } 309 310 err = dquot_initialize(dir); 311 if (err) 312 return err; 313 314 f2fs_balance_fs(sbi, true); 315 316 f2fs_lock_op(sbi); 317 318 de = f2fs_find_entry(dir, &dot, &page); 319 if (de) { 320 f2fs_dentry_kunmap(dir, page); 321 f2fs_put_page(page, 0); 322 } else if (IS_ERR(page)) { 323 err = PTR_ERR(page); 324 goto out; 325 } else { 326 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR); 327 if (err) 328 goto out; 329 } 330 331 de = f2fs_find_entry(dir, &dotdot, &page); 332 if (de) { 333 f2fs_dentry_kunmap(dir, page); 334 f2fs_put_page(page, 0); 335 } else if (IS_ERR(page)) { 336 err = PTR_ERR(page); 337 } else { 338 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR); 339 } 340 out: 341 if (!err) 342 clear_inode_flag(dir, FI_INLINE_DOTS); 343 344 f2fs_unlock_op(sbi); 345 return err; 346 } 347 348 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, 349 unsigned int flags) 350 { 351 struct inode *inode = NULL; 352 struct f2fs_dir_entry *de; 353 struct page *page; 354 struct dentry *new; 355 nid_t ino = -1; 356 int err = 0; 357 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir)); 358 359 trace_f2fs_lookup_start(dir, dentry, flags); 360 361 err = fscrypt_prepare_lookup(dir, dentry, flags); 362 if (err) 363 goto out; 364 365 if (dentry->d_name.len > F2FS_NAME_LEN) { 366 err = -ENAMETOOLONG; 367 goto out; 368 } 369 370 de = f2fs_find_entry(dir, &dentry->d_name, &page); 371 if (!de) { 372 if (IS_ERR(page)) { 373 err = PTR_ERR(page); 374 goto out; 375 } 376 goto out_splice; 377 } 378 379 ino = le32_to_cpu(de->ino); 380 f2fs_dentry_kunmap(dir, page); 381 f2fs_put_page(page, 0); 382 383 inode = f2fs_iget(dir->i_sb, ino); 384 if (IS_ERR(inode)) { 385 err = PTR_ERR(inode); 386 goto out; 387 } 388 389 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) { 390 err = __recover_dot_dentries(dir, root_ino); 391 if (err) 392 goto out_iput; 393 } 394 395 if (f2fs_has_inline_dots(inode)) { 396 err = __recover_dot_dentries(inode, dir->i_ino); 397 if (err) 398 goto out_iput; 399 } 400 if (f2fs_encrypted_inode(dir) && 401 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && 402 !fscrypt_has_permitted_context(dir, inode)) { 403 f2fs_msg(inode->i_sb, KERN_WARNING, 404 "Inconsistent encryption contexts: %lu/%lu", 405 dir->i_ino, inode->i_ino); 406 err = -EPERM; 407 goto out_iput; 408 } 409 out_splice: 410 new = d_splice_alias(inode, dentry); 411 if (IS_ERR(new)) 412 err = PTR_ERR(new); 413 trace_f2fs_lookup_end(dir, dentry, ino, err); 414 return new; 415 out_iput: 416 iput(inode); 417 out: 418 trace_f2fs_lookup_end(dir, dentry, ino, err); 419 return ERR_PTR(err); 420 } 421 422 static int f2fs_unlink(struct inode *dir, struct dentry *dentry) 423 { 424 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 425 struct inode *inode = d_inode(dentry); 426 struct f2fs_dir_entry *de; 427 struct page *page; 428 int err = -ENOENT; 429 430 trace_f2fs_unlink_enter(dir, dentry); 431 432 if (unlikely(f2fs_cp_error(sbi))) 433 return -EIO; 434 435 err = dquot_initialize(dir); 436 if (err) 437 return err; 438 err = dquot_initialize(inode); 439 if (err) 440 return err; 441 442 de = f2fs_find_entry(dir, &dentry->d_name, &page); 443 if (!de) { 444 if (IS_ERR(page)) 445 err = PTR_ERR(page); 446 goto fail; 447 } 448 449 f2fs_balance_fs(sbi, true); 450 451 f2fs_lock_op(sbi); 452 err = acquire_orphan_inode(sbi); 453 if (err) { 454 f2fs_unlock_op(sbi); 455 f2fs_dentry_kunmap(dir, page); 456 f2fs_put_page(page, 0); 457 goto fail; 458 } 459 f2fs_delete_entry(de, page, dir, inode); 460 f2fs_unlock_op(sbi); 461 462 if (IS_DIRSYNC(dir)) 463 f2fs_sync_fs(sbi->sb, 1); 464 fail: 465 trace_f2fs_unlink_exit(inode, err); 466 return err; 467 } 468 469 static const char *f2fs_get_link(struct dentry *dentry, 470 struct inode *inode, 471 struct delayed_call *done) 472 { 473 const char *link = page_get_link(dentry, inode, done); 474 if (!IS_ERR(link) && !*link) { 475 /* this is broken symlink case */ 476 do_delayed_call(done); 477 clear_delayed_call(done); 478 link = ERR_PTR(-ENOENT); 479 } 480 return link; 481 } 482 483 static int f2fs_symlink(struct inode *dir, struct dentry *dentry, 484 const char *symname) 485 { 486 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 487 struct inode *inode; 488 size_t len = strlen(symname); 489 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1); 490 struct fscrypt_symlink_data *sd = NULL; 491 int err; 492 493 if (unlikely(f2fs_cp_error(sbi))) 494 return -EIO; 495 496 if (f2fs_encrypted_inode(dir)) { 497 err = fscrypt_get_encryption_info(dir); 498 if (err) 499 return err; 500 501 if (!fscrypt_has_encryption_key(dir)) 502 return -ENOKEY; 503 504 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) + 505 sizeof(struct fscrypt_symlink_data)); 506 } 507 508 if (disk_link.len > dir->i_sb->s_blocksize) 509 return -ENAMETOOLONG; 510 511 err = dquot_initialize(dir); 512 if (err) 513 return err; 514 515 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); 516 if (IS_ERR(inode)) 517 return PTR_ERR(inode); 518 519 if (f2fs_encrypted_inode(inode)) 520 inode->i_op = &f2fs_encrypted_symlink_inode_operations; 521 else 522 inode->i_op = &f2fs_symlink_inode_operations; 523 inode_nohighmem(inode); 524 inode->i_mapping->a_ops = &f2fs_dblock_aops; 525 526 f2fs_lock_op(sbi); 527 err = f2fs_add_link(dentry, inode); 528 if (err) 529 goto out; 530 f2fs_unlock_op(sbi); 531 alloc_nid_done(sbi, inode->i_ino); 532 533 if (f2fs_encrypted_inode(inode)) { 534 struct qstr istr = QSTR_INIT(symname, len); 535 struct fscrypt_str ostr; 536 537 sd = f2fs_kzalloc(sbi, disk_link.len, GFP_NOFS); 538 if (!sd) { 539 err = -ENOMEM; 540 goto err_out; 541 } 542 543 err = fscrypt_get_encryption_info(inode); 544 if (err) 545 goto err_out; 546 547 if (!fscrypt_has_encryption_key(inode)) { 548 err = -ENOKEY; 549 goto err_out; 550 } 551 552 ostr.name = sd->encrypted_path; 553 ostr.len = disk_link.len; 554 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr); 555 if (err) 556 goto err_out; 557 558 sd->len = cpu_to_le16(ostr.len); 559 disk_link.name = (char *)sd; 560 } 561 562 err = page_symlink(inode, disk_link.name, disk_link.len); 563 564 err_out: 565 d_instantiate(dentry, inode); 566 unlock_new_inode(inode); 567 568 /* 569 * Let's flush symlink data in order to avoid broken symlink as much as 570 * possible. Nevertheless, fsyncing is the best way, but there is no 571 * way to get a file descriptor in order to flush that. 572 * 573 * Note that, it needs to do dir->fsync to make this recoverable. 574 * If the symlink path is stored into inline_data, there is no 575 * performance regression. 576 */ 577 if (!err) { 578 filemap_write_and_wait_range(inode->i_mapping, 0, 579 disk_link.len - 1); 580 581 if (IS_DIRSYNC(dir)) 582 f2fs_sync_fs(sbi->sb, 1); 583 } else { 584 f2fs_unlink(dir, dentry); 585 } 586 587 kfree(sd); 588 589 f2fs_balance_fs(sbi, true); 590 return err; 591 out: 592 handle_failed_inode(inode); 593 return err; 594 } 595 596 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 597 { 598 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 599 struct inode *inode; 600 int err; 601 602 if (unlikely(f2fs_cp_error(sbi))) 603 return -EIO; 604 605 err = dquot_initialize(dir); 606 if (err) 607 return err; 608 609 inode = f2fs_new_inode(dir, S_IFDIR | mode); 610 if (IS_ERR(inode)) 611 return PTR_ERR(inode); 612 613 inode->i_op = &f2fs_dir_inode_operations; 614 inode->i_fop = &f2fs_dir_operations; 615 inode->i_mapping->a_ops = &f2fs_dblock_aops; 616 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO); 617 618 set_inode_flag(inode, FI_INC_LINK); 619 f2fs_lock_op(sbi); 620 err = f2fs_add_link(dentry, inode); 621 if (err) 622 goto out_fail; 623 f2fs_unlock_op(sbi); 624 625 alloc_nid_done(sbi, inode->i_ino); 626 627 d_instantiate(dentry, inode); 628 unlock_new_inode(inode); 629 630 if (IS_DIRSYNC(dir)) 631 f2fs_sync_fs(sbi->sb, 1); 632 633 f2fs_balance_fs(sbi, true); 634 return 0; 635 636 out_fail: 637 clear_inode_flag(inode, FI_INC_LINK); 638 handle_failed_inode(inode); 639 return err; 640 } 641 642 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) 643 { 644 struct inode *inode = d_inode(dentry); 645 if (f2fs_empty_dir(inode)) 646 return f2fs_unlink(dir, dentry); 647 return -ENOTEMPTY; 648 } 649 650 static int f2fs_mknod(struct inode *dir, struct dentry *dentry, 651 umode_t mode, dev_t rdev) 652 { 653 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 654 struct inode *inode; 655 int err = 0; 656 657 if (unlikely(f2fs_cp_error(sbi))) 658 return -EIO; 659 660 err = dquot_initialize(dir); 661 if (err) 662 return err; 663 664 inode = f2fs_new_inode(dir, mode); 665 if (IS_ERR(inode)) 666 return PTR_ERR(inode); 667 668 init_special_inode(inode, inode->i_mode, rdev); 669 inode->i_op = &f2fs_special_inode_operations; 670 671 f2fs_lock_op(sbi); 672 err = f2fs_add_link(dentry, inode); 673 if (err) 674 goto out; 675 f2fs_unlock_op(sbi); 676 677 alloc_nid_done(sbi, inode->i_ino); 678 679 d_instantiate(dentry, inode); 680 unlock_new_inode(inode); 681 682 if (IS_DIRSYNC(dir)) 683 f2fs_sync_fs(sbi->sb, 1); 684 685 f2fs_balance_fs(sbi, true); 686 return 0; 687 out: 688 handle_failed_inode(inode); 689 return err; 690 } 691 692 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry, 693 umode_t mode, struct inode **whiteout) 694 { 695 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 696 struct inode *inode; 697 int err; 698 699 err = dquot_initialize(dir); 700 if (err) 701 return err; 702 703 inode = f2fs_new_inode(dir, mode); 704 if (IS_ERR(inode)) 705 return PTR_ERR(inode); 706 707 if (whiteout) { 708 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); 709 inode->i_op = &f2fs_special_inode_operations; 710 } else { 711 inode->i_op = &f2fs_file_inode_operations; 712 inode->i_fop = &f2fs_file_operations; 713 inode->i_mapping->a_ops = &f2fs_dblock_aops; 714 } 715 716 f2fs_lock_op(sbi); 717 err = acquire_orphan_inode(sbi); 718 if (err) 719 goto out; 720 721 err = f2fs_do_tmpfile(inode, dir); 722 if (err) 723 goto release_out; 724 725 /* 726 * add this non-linked tmpfile to orphan list, in this way we could 727 * remove all unused data of tmpfile after abnormal power-off. 728 */ 729 add_orphan_inode(inode); 730 alloc_nid_done(sbi, inode->i_ino); 731 732 if (whiteout) { 733 f2fs_i_links_write(inode, false); 734 *whiteout = inode; 735 } else { 736 d_tmpfile(dentry, inode); 737 } 738 /* link_count was changed by d_tmpfile as well. */ 739 f2fs_unlock_op(sbi); 740 unlock_new_inode(inode); 741 742 f2fs_balance_fs(sbi, true); 743 return 0; 744 745 release_out: 746 release_orphan_inode(sbi); 747 out: 748 handle_failed_inode(inode); 749 return err; 750 } 751 752 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) 753 { 754 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir)))) 755 return -EIO; 756 757 if (f2fs_encrypted_inode(dir)) { 758 int err = fscrypt_get_encryption_info(dir); 759 if (err) 760 return err; 761 } 762 763 return __f2fs_tmpfile(dir, dentry, mode, NULL); 764 } 765 766 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout) 767 { 768 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir)))) 769 return -EIO; 770 771 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout); 772 } 773 774 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, 775 struct inode *new_dir, struct dentry *new_dentry, 776 unsigned int flags) 777 { 778 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); 779 struct inode *old_inode = d_inode(old_dentry); 780 struct inode *new_inode = d_inode(new_dentry); 781 struct inode *whiteout = NULL; 782 struct page *old_dir_page; 783 struct page *old_page, *new_page = NULL; 784 struct f2fs_dir_entry *old_dir_entry = NULL; 785 struct f2fs_dir_entry *old_entry; 786 struct f2fs_dir_entry *new_entry; 787 bool is_old_inline = f2fs_has_inline_dentry(old_dir); 788 int err = -ENOENT; 789 790 if (unlikely(f2fs_cp_error(sbi))) 791 return -EIO; 792 793 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && 794 (!projid_eq(F2FS_I(new_dir)->i_projid, 795 F2FS_I(old_dentry->d_inode)->i_projid))) 796 return -EXDEV; 797 798 err = dquot_initialize(old_dir); 799 if (err) 800 goto out; 801 802 err = dquot_initialize(new_dir); 803 if (err) 804 goto out; 805 806 if (new_inode) { 807 err = dquot_initialize(new_inode); 808 if (err) 809 goto out; 810 } 811 812 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); 813 if (!old_entry) { 814 if (IS_ERR(old_page)) 815 err = PTR_ERR(old_page); 816 goto out; 817 } 818 819 if (S_ISDIR(old_inode->i_mode)) { 820 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); 821 if (!old_dir_entry) { 822 if (IS_ERR(old_dir_page)) 823 err = PTR_ERR(old_dir_page); 824 goto out_old; 825 } 826 } 827 828 if (flags & RENAME_WHITEOUT) { 829 err = f2fs_create_whiteout(old_dir, &whiteout); 830 if (err) 831 goto out_dir; 832 } 833 834 if (new_inode) { 835 836 err = -ENOTEMPTY; 837 if (old_dir_entry && !f2fs_empty_dir(new_inode)) 838 goto out_whiteout; 839 840 err = -ENOENT; 841 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, 842 &new_page); 843 if (!new_entry) { 844 if (IS_ERR(new_page)) 845 err = PTR_ERR(new_page); 846 goto out_whiteout; 847 } 848 849 f2fs_balance_fs(sbi, true); 850 851 f2fs_lock_op(sbi); 852 853 err = acquire_orphan_inode(sbi); 854 if (err) 855 goto put_out_dir; 856 857 f2fs_set_link(new_dir, new_entry, new_page, old_inode); 858 859 new_inode->i_ctime = current_time(new_inode); 860 down_write(&F2FS_I(new_inode)->i_sem); 861 if (old_dir_entry) 862 f2fs_i_links_write(new_inode, false); 863 f2fs_i_links_write(new_inode, false); 864 up_write(&F2FS_I(new_inode)->i_sem); 865 866 if (!new_inode->i_nlink) 867 add_orphan_inode(new_inode); 868 else 869 release_orphan_inode(sbi); 870 } else { 871 f2fs_balance_fs(sbi, true); 872 873 f2fs_lock_op(sbi); 874 875 err = f2fs_add_link(new_dentry, old_inode); 876 if (err) { 877 f2fs_unlock_op(sbi); 878 goto out_whiteout; 879 } 880 881 if (old_dir_entry) 882 f2fs_i_links_write(new_dir, true); 883 884 /* 885 * old entry and new entry can locate in the same inline 886 * dentry in inode, when attaching new entry in inline dentry, 887 * it could force inline dentry conversion, after that, 888 * old_entry and old_page will point to wrong address, in 889 * order to avoid this, let's do the check and update here. 890 */ 891 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) { 892 f2fs_put_page(old_page, 0); 893 old_page = NULL; 894 895 old_entry = f2fs_find_entry(old_dir, 896 &old_dentry->d_name, &old_page); 897 if (!old_entry) { 898 err = -ENOENT; 899 if (IS_ERR(old_page)) 900 err = PTR_ERR(old_page); 901 f2fs_unlock_op(sbi); 902 goto out_whiteout; 903 } 904 } 905 } 906 907 down_write(&F2FS_I(old_inode)->i_sem); 908 if (!old_dir_entry || whiteout) 909 file_lost_pino(old_inode); 910 else 911 F2FS_I(old_inode)->i_pino = new_dir->i_ino; 912 up_write(&F2FS_I(old_inode)->i_sem); 913 914 old_inode->i_ctime = current_time(old_inode); 915 f2fs_mark_inode_dirty_sync(old_inode, false); 916 917 f2fs_delete_entry(old_entry, old_page, old_dir, NULL); 918 919 if (whiteout) { 920 whiteout->i_state |= I_LINKABLE; 921 set_inode_flag(whiteout, FI_INC_LINK); 922 err = f2fs_add_link(old_dentry, whiteout); 923 if (err) 924 goto put_out_dir; 925 whiteout->i_state &= ~I_LINKABLE; 926 iput(whiteout); 927 } 928 929 if (old_dir_entry) { 930 if (old_dir != new_dir && !whiteout) { 931 f2fs_set_link(old_inode, old_dir_entry, 932 old_dir_page, new_dir); 933 } else { 934 f2fs_dentry_kunmap(old_inode, old_dir_page); 935 f2fs_put_page(old_dir_page, 0); 936 } 937 f2fs_i_links_write(old_dir, false); 938 } 939 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO); 940 941 f2fs_unlock_op(sbi); 942 943 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) 944 f2fs_sync_fs(sbi->sb, 1); 945 return 0; 946 947 put_out_dir: 948 f2fs_unlock_op(sbi); 949 if (new_page) { 950 f2fs_dentry_kunmap(new_dir, new_page); 951 f2fs_put_page(new_page, 0); 952 } 953 out_whiteout: 954 if (whiteout) 955 iput(whiteout); 956 out_dir: 957 if (old_dir_entry) { 958 f2fs_dentry_kunmap(old_inode, old_dir_page); 959 f2fs_put_page(old_dir_page, 0); 960 } 961 out_old: 962 f2fs_dentry_kunmap(old_dir, old_page); 963 f2fs_put_page(old_page, 0); 964 out: 965 return err; 966 } 967 968 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry, 969 struct inode *new_dir, struct dentry *new_dentry) 970 { 971 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); 972 struct inode *old_inode = d_inode(old_dentry); 973 struct inode *new_inode = d_inode(new_dentry); 974 struct page *old_dir_page, *new_dir_page; 975 struct page *old_page, *new_page; 976 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL; 977 struct f2fs_dir_entry *old_entry, *new_entry; 978 int old_nlink = 0, new_nlink = 0; 979 int err = -ENOENT; 980 981 if (unlikely(f2fs_cp_error(sbi))) 982 return -EIO; 983 984 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && 985 !projid_eq(F2FS_I(new_dir)->i_projid, 986 F2FS_I(old_dentry->d_inode)->i_projid)) || 987 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && 988 !projid_eq(F2FS_I(old_dir)->i_projid, 989 F2FS_I(new_dentry->d_inode)->i_projid))) 990 return -EXDEV; 991 992 err = dquot_initialize(old_dir); 993 if (err) 994 goto out; 995 996 err = dquot_initialize(new_dir); 997 if (err) 998 goto out; 999 1000 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); 1001 if (!old_entry) { 1002 if (IS_ERR(old_page)) 1003 err = PTR_ERR(old_page); 1004 goto out; 1005 } 1006 1007 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page); 1008 if (!new_entry) { 1009 if (IS_ERR(new_page)) 1010 err = PTR_ERR(new_page); 1011 goto out_old; 1012 } 1013 1014 /* prepare for updating ".." directory entry info later */ 1015 if (old_dir != new_dir) { 1016 if (S_ISDIR(old_inode->i_mode)) { 1017 old_dir_entry = f2fs_parent_dir(old_inode, 1018 &old_dir_page); 1019 if (!old_dir_entry) { 1020 if (IS_ERR(old_dir_page)) 1021 err = PTR_ERR(old_dir_page); 1022 goto out_new; 1023 } 1024 } 1025 1026 if (S_ISDIR(new_inode->i_mode)) { 1027 new_dir_entry = f2fs_parent_dir(new_inode, 1028 &new_dir_page); 1029 if (!new_dir_entry) { 1030 if (IS_ERR(new_dir_page)) 1031 err = PTR_ERR(new_dir_page); 1032 goto out_old_dir; 1033 } 1034 } 1035 } 1036 1037 /* 1038 * If cross rename between file and directory those are not 1039 * in the same directory, we will inc nlink of file's parent 1040 * later, so we should check upper boundary of its nlink. 1041 */ 1042 if ((!old_dir_entry || !new_dir_entry) && 1043 old_dir_entry != new_dir_entry) { 1044 old_nlink = old_dir_entry ? -1 : 1; 1045 new_nlink = -old_nlink; 1046 err = -EMLINK; 1047 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) || 1048 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX)) 1049 goto out_new_dir; 1050 } 1051 1052 f2fs_balance_fs(sbi, true); 1053 1054 f2fs_lock_op(sbi); 1055 1056 /* update ".." directory entry info of old dentry */ 1057 if (old_dir_entry) 1058 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); 1059 1060 /* update ".." directory entry info of new dentry */ 1061 if (new_dir_entry) 1062 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir); 1063 1064 /* update directory entry info of old dir inode */ 1065 f2fs_set_link(old_dir, old_entry, old_page, new_inode); 1066 1067 down_write(&F2FS_I(old_inode)->i_sem); 1068 file_lost_pino(old_inode); 1069 up_write(&F2FS_I(old_inode)->i_sem); 1070 1071 old_dir->i_ctime = current_time(old_dir); 1072 if (old_nlink) { 1073 down_write(&F2FS_I(old_dir)->i_sem); 1074 f2fs_i_links_write(old_dir, old_nlink > 0); 1075 up_write(&F2FS_I(old_dir)->i_sem); 1076 } 1077 f2fs_mark_inode_dirty_sync(old_dir, false); 1078 1079 /* update directory entry info of new dir inode */ 1080 f2fs_set_link(new_dir, new_entry, new_page, old_inode); 1081 1082 down_write(&F2FS_I(new_inode)->i_sem); 1083 file_lost_pino(new_inode); 1084 up_write(&F2FS_I(new_inode)->i_sem); 1085 1086 new_dir->i_ctime = current_time(new_dir); 1087 if (new_nlink) { 1088 down_write(&F2FS_I(new_dir)->i_sem); 1089 f2fs_i_links_write(new_dir, new_nlink > 0); 1090 up_write(&F2FS_I(new_dir)->i_sem); 1091 } 1092 f2fs_mark_inode_dirty_sync(new_dir, false); 1093 1094 add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO); 1095 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO); 1096 1097 f2fs_unlock_op(sbi); 1098 1099 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) 1100 f2fs_sync_fs(sbi->sb, 1); 1101 return 0; 1102 out_new_dir: 1103 if (new_dir_entry) { 1104 f2fs_dentry_kunmap(new_inode, new_dir_page); 1105 f2fs_put_page(new_dir_page, 0); 1106 } 1107 out_old_dir: 1108 if (old_dir_entry) { 1109 f2fs_dentry_kunmap(old_inode, old_dir_page); 1110 f2fs_put_page(old_dir_page, 0); 1111 } 1112 out_new: 1113 f2fs_dentry_kunmap(new_dir, new_page); 1114 f2fs_put_page(new_page, 0); 1115 out_old: 1116 f2fs_dentry_kunmap(old_dir, old_page); 1117 f2fs_put_page(old_page, 0); 1118 out: 1119 return err; 1120 } 1121 1122 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry, 1123 struct inode *new_dir, struct dentry *new_dentry, 1124 unsigned int flags) 1125 { 1126 int err; 1127 1128 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) 1129 return -EINVAL; 1130 1131 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, 1132 flags); 1133 if (err) 1134 return err; 1135 1136 if (flags & RENAME_EXCHANGE) { 1137 return f2fs_cross_rename(old_dir, old_dentry, 1138 new_dir, new_dentry); 1139 } 1140 /* 1141 * VFS has already handled the new dentry existence case, 1142 * here, we just deal with "RENAME_NOREPLACE" as regular rename. 1143 */ 1144 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags); 1145 } 1146 1147 static const char *f2fs_encrypted_get_link(struct dentry *dentry, 1148 struct inode *inode, 1149 struct delayed_call *done) 1150 { 1151 struct page *cpage = NULL; 1152 char *caddr, *paddr = NULL; 1153 struct fscrypt_str cstr = FSTR_INIT(NULL, 0); 1154 struct fscrypt_str pstr = FSTR_INIT(NULL, 0); 1155 struct fscrypt_symlink_data *sd; 1156 u32 max_size = inode->i_sb->s_blocksize; 1157 int res; 1158 1159 if (!dentry) 1160 return ERR_PTR(-ECHILD); 1161 1162 res = fscrypt_get_encryption_info(inode); 1163 if (res) 1164 return ERR_PTR(res); 1165 1166 cpage = read_mapping_page(inode->i_mapping, 0, NULL); 1167 if (IS_ERR(cpage)) 1168 return ERR_CAST(cpage); 1169 caddr = page_address(cpage); 1170 1171 /* Symlink is encrypted */ 1172 sd = (struct fscrypt_symlink_data *)caddr; 1173 cstr.name = sd->encrypted_path; 1174 cstr.len = le16_to_cpu(sd->len); 1175 1176 /* this is broken symlink case */ 1177 if (unlikely(cstr.len == 0)) { 1178 res = -ENOENT; 1179 goto errout; 1180 } 1181 1182 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) { 1183 /* Symlink data on the disk is corrupted */ 1184 res = -EIO; 1185 goto errout; 1186 } 1187 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr); 1188 if (res) 1189 goto errout; 1190 1191 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr); 1192 if (res) 1193 goto errout; 1194 1195 /* this is broken symlink case */ 1196 if (unlikely(pstr.name[0] == 0)) { 1197 res = -ENOENT; 1198 goto errout; 1199 } 1200 1201 paddr = pstr.name; 1202 1203 /* Null-terminate the name */ 1204 paddr[pstr.len] = '\0'; 1205 1206 put_page(cpage); 1207 set_delayed_call(done, kfree_link, paddr); 1208 return paddr; 1209 errout: 1210 fscrypt_fname_free_buffer(&pstr); 1211 put_page(cpage); 1212 return ERR_PTR(res); 1213 } 1214 1215 const struct inode_operations f2fs_encrypted_symlink_inode_operations = { 1216 .get_link = f2fs_encrypted_get_link, 1217 .getattr = f2fs_getattr, 1218 .setattr = f2fs_setattr, 1219 #ifdef CONFIG_F2FS_FS_XATTR 1220 .listxattr = f2fs_listxattr, 1221 #endif 1222 }; 1223 1224 const struct inode_operations f2fs_dir_inode_operations = { 1225 .create = f2fs_create, 1226 .lookup = f2fs_lookup, 1227 .link = f2fs_link, 1228 .unlink = f2fs_unlink, 1229 .symlink = f2fs_symlink, 1230 .mkdir = f2fs_mkdir, 1231 .rmdir = f2fs_rmdir, 1232 .mknod = f2fs_mknod, 1233 .rename = f2fs_rename2, 1234 .tmpfile = f2fs_tmpfile, 1235 .getattr = f2fs_getattr, 1236 .setattr = f2fs_setattr, 1237 .get_acl = f2fs_get_acl, 1238 .set_acl = f2fs_set_acl, 1239 #ifdef CONFIG_F2FS_FS_XATTR 1240 .listxattr = f2fs_listxattr, 1241 #endif 1242 }; 1243 1244 const struct inode_operations f2fs_symlink_inode_operations = { 1245 .get_link = f2fs_get_link, 1246 .getattr = f2fs_getattr, 1247 .setattr = f2fs_setattr, 1248 #ifdef CONFIG_F2FS_FS_XATTR 1249 .listxattr = f2fs_listxattr, 1250 #endif 1251 }; 1252 1253 const struct inode_operations f2fs_special_inode_operations = { 1254 .getattr = f2fs_getattr, 1255 .setattr = f2fs_setattr, 1256 .get_acl = f2fs_get_acl, 1257 .set_acl = f2fs_set_acl, 1258 #ifdef CONFIG_F2FS_FS_XATTR 1259 .listxattr = f2fs_listxattr, 1260 #endif 1261 }; 1262