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