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 19 #include "f2fs.h" 20 #include "node.h" 21 #include "xattr.h" 22 #include "acl.h" 23 #include <trace/events/f2fs.h> 24 25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) 26 { 27 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 28 nid_t ino; 29 struct inode *inode; 30 bool nid_free = false; 31 int err; 32 33 inode = new_inode(dir->i_sb); 34 if (!inode) 35 return ERR_PTR(-ENOMEM); 36 37 f2fs_lock_op(sbi); 38 if (!alloc_nid(sbi, &ino)) { 39 f2fs_unlock_op(sbi); 40 err = -ENOSPC; 41 goto fail; 42 } 43 f2fs_unlock_op(sbi); 44 45 inode_init_owner(inode, dir, mode); 46 47 inode->i_ino = ino; 48 inode->i_blocks = 0; 49 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); 50 inode->i_generation = sbi->s_next_generation++; 51 52 err = insert_inode_locked(inode); 53 if (err) { 54 err = -EINVAL; 55 nid_free = true; 56 goto fail; 57 } 58 59 /* If the directory encrypted, then we should encrypt the inode. */ 60 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) 61 f2fs_set_encrypted_inode(inode); 62 63 set_inode_flag(inode, FI_NEW_INODE); 64 65 if (test_opt(sbi, INLINE_XATTR)) 66 set_inode_flag(inode, FI_INLINE_XATTR); 67 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode)) 68 set_inode_flag(inode, FI_INLINE_DATA); 69 if (f2fs_may_inline_dentry(inode)) 70 set_inode_flag(inode, FI_INLINE_DENTRY); 71 72 f2fs_init_extent_tree(inode, NULL); 73 74 stat_inc_inline_xattr(inode); 75 stat_inc_inline_inode(inode); 76 stat_inc_inline_dir(inode); 77 78 trace_f2fs_new_inode(inode, 0); 79 return inode; 80 81 fail: 82 trace_f2fs_new_inode(inode, err); 83 make_bad_inode(inode); 84 if (nid_free) 85 set_inode_flag(inode, FI_FREE_NID); 86 iput(inode); 87 return ERR_PTR(err); 88 } 89 90 static int is_multimedia_file(const unsigned char *s, const char *sub) 91 { 92 size_t slen = strlen(s); 93 size_t sublen = strlen(sub); 94 int i; 95 96 /* 97 * filename format of multimedia file should be defined as: 98 * "filename + '.' + extension + (optional: '.' + temp extension)". 99 */ 100 if (slen < sublen + 2) 101 return 0; 102 103 for (i = 1; i < slen - sublen; i++) { 104 if (s[i] != '.') 105 continue; 106 if (!strncasecmp(s + i + 1, sub, sublen)) 107 return 1; 108 } 109 110 return 0; 111 } 112 113 /* 114 * Set multimedia files as cold files for hot/cold data separation 115 */ 116 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode, 117 const unsigned char *name) 118 { 119 int i; 120 __u8 (*extlist)[8] = sbi->raw_super->extension_list; 121 122 int count = le32_to_cpu(sbi->raw_super->extension_count); 123 for (i = 0; i < count; i++) { 124 if (is_multimedia_file(name, extlist[i])) { 125 file_set_cold(inode); 126 break; 127 } 128 } 129 } 130 131 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 132 bool excl) 133 { 134 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 135 struct inode *inode; 136 nid_t ino = 0; 137 int err; 138 139 inode = f2fs_new_inode(dir, mode); 140 if (IS_ERR(inode)) 141 return PTR_ERR(inode); 142 143 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) 144 set_cold_files(sbi, inode, dentry->d_name.name); 145 146 inode->i_op = &f2fs_file_inode_operations; 147 inode->i_fop = &f2fs_file_operations; 148 inode->i_mapping->a_ops = &f2fs_dblock_aops; 149 ino = inode->i_ino; 150 151 f2fs_balance_fs(sbi, true); 152 153 f2fs_lock_op(sbi); 154 err = f2fs_add_link(dentry, inode); 155 if (err) 156 goto out; 157 f2fs_unlock_op(sbi); 158 159 alloc_nid_done(sbi, ino); 160 161 d_instantiate(dentry, inode); 162 unlock_new_inode(inode); 163 164 if (IS_DIRSYNC(dir)) 165 f2fs_sync_fs(sbi->sb, 1); 166 return 0; 167 out: 168 handle_failed_inode(inode); 169 return err; 170 } 171 172 static int f2fs_link(struct dentry *old_dentry, struct inode *dir, 173 struct dentry *dentry) 174 { 175 struct inode *inode = d_inode(old_dentry); 176 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 177 int err; 178 179 if (f2fs_encrypted_inode(dir) && 180 !fscrypt_has_permitted_context(dir, inode)) 181 return -EPERM; 182 183 f2fs_balance_fs(sbi, true); 184 185 inode->i_ctime = current_time(inode); 186 ihold(inode); 187 188 set_inode_flag(inode, FI_INC_LINK); 189 f2fs_lock_op(sbi); 190 err = f2fs_add_link(dentry, inode); 191 if (err) 192 goto out; 193 f2fs_unlock_op(sbi); 194 195 d_instantiate(dentry, inode); 196 197 if (IS_DIRSYNC(dir)) 198 f2fs_sync_fs(sbi->sb, 1); 199 return 0; 200 out: 201 clear_inode_flag(inode, FI_INC_LINK); 202 iput(inode); 203 f2fs_unlock_op(sbi); 204 return err; 205 } 206 207 struct dentry *f2fs_get_parent(struct dentry *child) 208 { 209 struct qstr dotdot = QSTR_INIT("..", 2); 210 struct page *page; 211 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page); 212 if (!ino) { 213 if (IS_ERR(page)) 214 return ERR_CAST(page); 215 return ERR_PTR(-ENOENT); 216 } 217 return d_obtain_alias(f2fs_iget(child->d_sb, ino)); 218 } 219 220 static int __recover_dot_dentries(struct inode *dir, nid_t pino) 221 { 222 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 223 struct qstr dot = QSTR_INIT(".", 1); 224 struct qstr dotdot = QSTR_INIT("..", 2); 225 struct f2fs_dir_entry *de; 226 struct page *page; 227 int err = 0; 228 229 if (f2fs_readonly(sbi->sb)) { 230 f2fs_msg(sbi->sb, KERN_INFO, 231 "skip recovering inline_dots inode (ino:%lu, pino:%u) " 232 "in readonly mountpoint", dir->i_ino, pino); 233 return 0; 234 } 235 236 f2fs_balance_fs(sbi, true); 237 238 f2fs_lock_op(sbi); 239 240 de = f2fs_find_entry(dir, &dot, &page); 241 if (de) { 242 f2fs_dentry_kunmap(dir, page); 243 f2fs_put_page(page, 0); 244 } else if (IS_ERR(page)) { 245 err = PTR_ERR(page); 246 goto out; 247 } else { 248 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR); 249 if (err) 250 goto out; 251 } 252 253 de = f2fs_find_entry(dir, &dotdot, &page); 254 if (de) { 255 f2fs_dentry_kunmap(dir, page); 256 f2fs_put_page(page, 0); 257 } else if (IS_ERR(page)) { 258 err = PTR_ERR(page); 259 } else { 260 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR); 261 } 262 out: 263 if (!err) 264 clear_inode_flag(dir, FI_INLINE_DOTS); 265 266 f2fs_unlock_op(sbi); 267 return err; 268 } 269 270 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, 271 unsigned int flags) 272 { 273 struct inode *inode = NULL; 274 struct f2fs_dir_entry *de; 275 struct page *page; 276 nid_t ino; 277 int err = 0; 278 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir)); 279 280 if (f2fs_encrypted_inode(dir)) { 281 int res = fscrypt_get_encryption_info(dir); 282 283 /* 284 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is 285 * created while the directory was encrypted and we 286 * don't have access to the key. 287 */ 288 if (fscrypt_has_encryption_key(dir)) 289 fscrypt_set_encrypted_dentry(dentry); 290 fscrypt_set_d_op(dentry); 291 if (res && res != -ENOKEY) 292 return ERR_PTR(res); 293 } 294 295 if (dentry->d_name.len > F2FS_NAME_LEN) 296 return ERR_PTR(-ENAMETOOLONG); 297 298 de = f2fs_find_entry(dir, &dentry->d_name, &page); 299 if (!de) { 300 if (IS_ERR(page)) 301 return (struct dentry *)page; 302 return d_splice_alias(inode, dentry); 303 } 304 305 ino = le32_to_cpu(de->ino); 306 f2fs_dentry_kunmap(dir, page); 307 f2fs_put_page(page, 0); 308 309 inode = f2fs_iget(dir->i_sb, ino); 310 if (IS_ERR(inode)) 311 return ERR_CAST(inode); 312 313 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) { 314 err = __recover_dot_dentries(dir, root_ino); 315 if (err) 316 goto err_out; 317 } 318 319 if (f2fs_has_inline_dots(inode)) { 320 err = __recover_dot_dentries(inode, dir->i_ino); 321 if (err) 322 goto err_out; 323 } 324 if (f2fs_encrypted_inode(dir) && 325 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && 326 !fscrypt_has_permitted_context(dir, inode)) { 327 bool nokey = f2fs_encrypted_inode(inode) && 328 !fscrypt_has_encryption_key(inode); 329 err = nokey ? -ENOKEY : -EPERM; 330 goto err_out; 331 } 332 return d_splice_alias(inode, dentry); 333 334 err_out: 335 iput(inode); 336 return ERR_PTR(err); 337 } 338 339 static int f2fs_unlink(struct inode *dir, struct dentry *dentry) 340 { 341 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 342 struct inode *inode = d_inode(dentry); 343 struct f2fs_dir_entry *de; 344 struct page *page; 345 int err = -ENOENT; 346 347 trace_f2fs_unlink_enter(dir, dentry); 348 349 de = f2fs_find_entry(dir, &dentry->d_name, &page); 350 if (!de) { 351 if (IS_ERR(page)) 352 err = PTR_ERR(page); 353 goto fail; 354 } 355 356 f2fs_balance_fs(sbi, true); 357 358 f2fs_lock_op(sbi); 359 err = acquire_orphan_inode(sbi); 360 if (err) { 361 f2fs_unlock_op(sbi); 362 f2fs_dentry_kunmap(dir, page); 363 f2fs_put_page(page, 0); 364 goto fail; 365 } 366 f2fs_delete_entry(de, page, dir, inode); 367 f2fs_unlock_op(sbi); 368 369 if (IS_DIRSYNC(dir)) 370 f2fs_sync_fs(sbi->sb, 1); 371 fail: 372 trace_f2fs_unlink_exit(inode, err); 373 return err; 374 } 375 376 static const char *f2fs_get_link(struct dentry *dentry, 377 struct inode *inode, 378 struct delayed_call *done) 379 { 380 const char *link = page_get_link(dentry, inode, done); 381 if (!IS_ERR(link) && !*link) { 382 /* this is broken symlink case */ 383 do_delayed_call(done); 384 clear_delayed_call(done); 385 link = ERR_PTR(-ENOENT); 386 } 387 return link; 388 } 389 390 static int f2fs_symlink(struct inode *dir, struct dentry *dentry, 391 const char *symname) 392 { 393 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 394 struct inode *inode; 395 size_t len = strlen(symname); 396 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1); 397 struct fscrypt_symlink_data *sd = NULL; 398 int err; 399 400 if (f2fs_encrypted_inode(dir)) { 401 err = fscrypt_get_encryption_info(dir); 402 if (err) 403 return err; 404 405 if (!fscrypt_has_encryption_key(dir)) 406 return -ENOKEY; 407 408 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) + 409 sizeof(struct fscrypt_symlink_data)); 410 } 411 412 if (disk_link.len > dir->i_sb->s_blocksize) 413 return -ENAMETOOLONG; 414 415 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); 416 if (IS_ERR(inode)) 417 return PTR_ERR(inode); 418 419 if (f2fs_encrypted_inode(inode)) 420 inode->i_op = &f2fs_encrypted_symlink_inode_operations; 421 else 422 inode->i_op = &f2fs_symlink_inode_operations; 423 inode_nohighmem(inode); 424 inode->i_mapping->a_ops = &f2fs_dblock_aops; 425 426 f2fs_balance_fs(sbi, true); 427 428 f2fs_lock_op(sbi); 429 err = f2fs_add_link(dentry, inode); 430 if (err) 431 goto out; 432 f2fs_unlock_op(sbi); 433 alloc_nid_done(sbi, inode->i_ino); 434 435 if (f2fs_encrypted_inode(inode)) { 436 struct qstr istr = QSTR_INIT(symname, len); 437 struct fscrypt_str ostr; 438 439 sd = kzalloc(disk_link.len, GFP_NOFS); 440 if (!sd) { 441 err = -ENOMEM; 442 goto err_out; 443 } 444 445 err = fscrypt_get_encryption_info(inode); 446 if (err) 447 goto err_out; 448 449 if (!fscrypt_has_encryption_key(inode)) { 450 err = -ENOKEY; 451 goto err_out; 452 } 453 454 ostr.name = sd->encrypted_path; 455 ostr.len = disk_link.len; 456 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr); 457 if (err) 458 goto err_out; 459 460 sd->len = cpu_to_le16(ostr.len); 461 disk_link.name = (char *)sd; 462 } 463 464 err = page_symlink(inode, disk_link.name, disk_link.len); 465 466 err_out: 467 d_instantiate(dentry, inode); 468 unlock_new_inode(inode); 469 470 /* 471 * Let's flush symlink data in order to avoid broken symlink as much as 472 * possible. Nevertheless, fsyncing is the best way, but there is no 473 * way to get a file descriptor in order to flush that. 474 * 475 * Note that, it needs to do dir->fsync to make this recoverable. 476 * If the symlink path is stored into inline_data, there is no 477 * performance regression. 478 */ 479 if (!err) { 480 filemap_write_and_wait_range(inode->i_mapping, 0, 481 disk_link.len - 1); 482 483 if (IS_DIRSYNC(dir)) 484 f2fs_sync_fs(sbi->sb, 1); 485 } else { 486 f2fs_unlink(dir, dentry); 487 } 488 489 kfree(sd); 490 return err; 491 out: 492 handle_failed_inode(inode); 493 return err; 494 } 495 496 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 497 { 498 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 499 struct inode *inode; 500 int err; 501 502 inode = f2fs_new_inode(dir, S_IFDIR | mode); 503 if (IS_ERR(inode)) 504 return PTR_ERR(inode); 505 506 inode->i_op = &f2fs_dir_inode_operations; 507 inode->i_fop = &f2fs_dir_operations; 508 inode->i_mapping->a_ops = &f2fs_dblock_aops; 509 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO); 510 511 f2fs_balance_fs(sbi, true); 512 513 set_inode_flag(inode, FI_INC_LINK); 514 f2fs_lock_op(sbi); 515 err = f2fs_add_link(dentry, inode); 516 if (err) 517 goto out_fail; 518 f2fs_unlock_op(sbi); 519 520 alloc_nid_done(sbi, inode->i_ino); 521 522 d_instantiate(dentry, inode); 523 unlock_new_inode(inode); 524 525 if (IS_DIRSYNC(dir)) 526 f2fs_sync_fs(sbi->sb, 1); 527 return 0; 528 529 out_fail: 530 clear_inode_flag(inode, FI_INC_LINK); 531 handle_failed_inode(inode); 532 return err; 533 } 534 535 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) 536 { 537 struct inode *inode = d_inode(dentry); 538 if (f2fs_empty_dir(inode)) 539 return f2fs_unlink(dir, dentry); 540 return -ENOTEMPTY; 541 } 542 543 static int f2fs_mknod(struct inode *dir, struct dentry *dentry, 544 umode_t mode, dev_t rdev) 545 { 546 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 547 struct inode *inode; 548 int err = 0; 549 550 inode = f2fs_new_inode(dir, mode); 551 if (IS_ERR(inode)) 552 return PTR_ERR(inode); 553 554 init_special_inode(inode, inode->i_mode, rdev); 555 inode->i_op = &f2fs_special_inode_operations; 556 557 f2fs_balance_fs(sbi, true); 558 559 f2fs_lock_op(sbi); 560 err = f2fs_add_link(dentry, inode); 561 if (err) 562 goto out; 563 f2fs_unlock_op(sbi); 564 565 alloc_nid_done(sbi, inode->i_ino); 566 567 d_instantiate(dentry, inode); 568 unlock_new_inode(inode); 569 570 if (IS_DIRSYNC(dir)) 571 f2fs_sync_fs(sbi->sb, 1); 572 return 0; 573 out: 574 handle_failed_inode(inode); 575 return err; 576 } 577 578 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry, 579 umode_t mode, struct inode **whiteout) 580 { 581 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 582 struct inode *inode; 583 int err; 584 585 inode = f2fs_new_inode(dir, mode); 586 if (IS_ERR(inode)) 587 return PTR_ERR(inode); 588 589 if (whiteout) { 590 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); 591 inode->i_op = &f2fs_special_inode_operations; 592 } else { 593 inode->i_op = &f2fs_file_inode_operations; 594 inode->i_fop = &f2fs_file_operations; 595 inode->i_mapping->a_ops = &f2fs_dblock_aops; 596 } 597 598 f2fs_balance_fs(sbi, true); 599 600 f2fs_lock_op(sbi); 601 err = acquire_orphan_inode(sbi); 602 if (err) 603 goto out; 604 605 err = f2fs_do_tmpfile(inode, dir); 606 if (err) 607 goto release_out; 608 609 /* 610 * add this non-linked tmpfile to orphan list, in this way we could 611 * remove all unused data of tmpfile after abnormal power-off. 612 */ 613 add_orphan_inode(inode); 614 alloc_nid_done(sbi, inode->i_ino); 615 616 if (whiteout) { 617 f2fs_i_links_write(inode, false); 618 *whiteout = inode; 619 } else { 620 d_tmpfile(dentry, inode); 621 } 622 /* link_count was changed by d_tmpfile as well. */ 623 f2fs_unlock_op(sbi); 624 unlock_new_inode(inode); 625 return 0; 626 627 release_out: 628 release_orphan_inode(sbi); 629 out: 630 handle_failed_inode(inode); 631 return err; 632 } 633 634 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) 635 { 636 if (f2fs_encrypted_inode(dir)) { 637 int err = fscrypt_get_encryption_info(dir); 638 if (err) 639 return err; 640 } 641 642 return __f2fs_tmpfile(dir, dentry, mode, NULL); 643 } 644 645 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout) 646 { 647 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout); 648 } 649 650 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, 651 struct inode *new_dir, struct dentry *new_dentry, 652 unsigned int flags) 653 { 654 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); 655 struct inode *old_inode = d_inode(old_dentry); 656 struct inode *new_inode = d_inode(new_dentry); 657 struct inode *whiteout = NULL; 658 struct page *old_dir_page; 659 struct page *old_page, *new_page = NULL; 660 struct f2fs_dir_entry *old_dir_entry = NULL; 661 struct f2fs_dir_entry *old_entry; 662 struct f2fs_dir_entry *new_entry; 663 bool is_old_inline = f2fs_has_inline_dentry(old_dir); 664 int err = -ENOENT; 665 666 if ((f2fs_encrypted_inode(old_dir) && 667 !fscrypt_has_encryption_key(old_dir)) || 668 (f2fs_encrypted_inode(new_dir) && 669 !fscrypt_has_encryption_key(new_dir))) 670 return -ENOKEY; 671 672 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) && 673 !fscrypt_has_permitted_context(new_dir, old_inode)) { 674 err = -EPERM; 675 goto out; 676 } 677 678 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); 679 if (!old_entry) { 680 if (IS_ERR(old_page)) 681 err = PTR_ERR(old_page); 682 goto out; 683 } 684 685 if (S_ISDIR(old_inode->i_mode)) { 686 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); 687 if (!old_dir_entry) { 688 if (IS_ERR(old_dir_page)) 689 err = PTR_ERR(old_dir_page); 690 goto out_old; 691 } 692 } 693 694 if (flags & RENAME_WHITEOUT) { 695 err = f2fs_create_whiteout(old_dir, &whiteout); 696 if (err) 697 goto out_dir; 698 } 699 700 if (new_inode) { 701 702 err = -ENOTEMPTY; 703 if (old_dir_entry && !f2fs_empty_dir(new_inode)) 704 goto out_whiteout; 705 706 err = -ENOENT; 707 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, 708 &new_page); 709 if (!new_entry) { 710 if (IS_ERR(new_page)) 711 err = PTR_ERR(new_page); 712 goto out_whiteout; 713 } 714 715 f2fs_balance_fs(sbi, true); 716 717 f2fs_lock_op(sbi); 718 719 err = acquire_orphan_inode(sbi); 720 if (err) 721 goto put_out_dir; 722 723 err = update_dent_inode(old_inode, new_inode, 724 &new_dentry->d_name); 725 if (err) { 726 release_orphan_inode(sbi); 727 goto put_out_dir; 728 } 729 730 f2fs_set_link(new_dir, new_entry, new_page, old_inode); 731 732 new_inode->i_ctime = current_time(new_inode); 733 down_write(&F2FS_I(new_inode)->i_sem); 734 if (old_dir_entry) 735 f2fs_i_links_write(new_inode, false); 736 f2fs_i_links_write(new_inode, false); 737 up_write(&F2FS_I(new_inode)->i_sem); 738 739 if (!new_inode->i_nlink) 740 add_orphan_inode(new_inode); 741 else 742 release_orphan_inode(sbi); 743 } else { 744 f2fs_balance_fs(sbi, true); 745 746 f2fs_lock_op(sbi); 747 748 err = f2fs_add_link(new_dentry, old_inode); 749 if (err) { 750 f2fs_unlock_op(sbi); 751 goto out_whiteout; 752 } 753 754 if (old_dir_entry) 755 f2fs_i_links_write(new_dir, true); 756 757 /* 758 * old entry and new entry can locate in the same inline 759 * dentry in inode, when attaching new entry in inline dentry, 760 * it could force inline dentry conversion, after that, 761 * old_entry and old_page will point to wrong address, in 762 * order to avoid this, let's do the check and update here. 763 */ 764 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) { 765 f2fs_put_page(old_page, 0); 766 old_page = NULL; 767 768 old_entry = f2fs_find_entry(old_dir, 769 &old_dentry->d_name, &old_page); 770 if (!old_entry) { 771 err = -ENOENT; 772 if (IS_ERR(old_page)) 773 err = PTR_ERR(old_page); 774 f2fs_unlock_op(sbi); 775 goto out_whiteout; 776 } 777 } 778 } 779 780 down_write(&F2FS_I(old_inode)->i_sem); 781 file_lost_pino(old_inode); 782 if (new_inode && file_enc_name(new_inode)) 783 file_set_enc_name(old_inode); 784 up_write(&F2FS_I(old_inode)->i_sem); 785 786 old_inode->i_ctime = current_time(old_inode); 787 f2fs_mark_inode_dirty_sync(old_inode, false); 788 789 f2fs_delete_entry(old_entry, old_page, old_dir, NULL); 790 791 if (whiteout) { 792 whiteout->i_state |= I_LINKABLE; 793 set_inode_flag(whiteout, FI_INC_LINK); 794 err = f2fs_add_link(old_dentry, whiteout); 795 if (err) 796 goto put_out_dir; 797 whiteout->i_state &= ~I_LINKABLE; 798 iput(whiteout); 799 } 800 801 if (old_dir_entry) { 802 if (old_dir != new_dir && !whiteout) { 803 f2fs_set_link(old_inode, old_dir_entry, 804 old_dir_page, new_dir); 805 } else { 806 f2fs_dentry_kunmap(old_inode, old_dir_page); 807 f2fs_put_page(old_dir_page, 0); 808 } 809 f2fs_i_links_write(old_dir, false); 810 } 811 812 f2fs_unlock_op(sbi); 813 814 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) 815 f2fs_sync_fs(sbi->sb, 1); 816 return 0; 817 818 put_out_dir: 819 f2fs_unlock_op(sbi); 820 if (new_page) { 821 f2fs_dentry_kunmap(new_dir, new_page); 822 f2fs_put_page(new_page, 0); 823 } 824 out_whiteout: 825 if (whiteout) 826 iput(whiteout); 827 out_dir: 828 if (old_dir_entry) { 829 f2fs_dentry_kunmap(old_inode, old_dir_page); 830 f2fs_put_page(old_dir_page, 0); 831 } 832 out_old: 833 f2fs_dentry_kunmap(old_dir, old_page); 834 f2fs_put_page(old_page, 0); 835 out: 836 return err; 837 } 838 839 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry, 840 struct inode *new_dir, struct dentry *new_dentry) 841 { 842 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); 843 struct inode *old_inode = d_inode(old_dentry); 844 struct inode *new_inode = d_inode(new_dentry); 845 struct page *old_dir_page, *new_dir_page; 846 struct page *old_page, *new_page; 847 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL; 848 struct f2fs_dir_entry *old_entry, *new_entry; 849 int old_nlink = 0, new_nlink = 0; 850 int err = -ENOENT; 851 852 if ((f2fs_encrypted_inode(old_dir) && 853 !fscrypt_has_encryption_key(old_dir)) || 854 (f2fs_encrypted_inode(new_dir) && 855 !fscrypt_has_encryption_key(new_dir))) 856 return -ENOKEY; 857 858 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) && 859 (old_dir != new_dir) && 860 (!fscrypt_has_permitted_context(new_dir, old_inode) || 861 !fscrypt_has_permitted_context(old_dir, new_inode))) 862 return -EPERM; 863 864 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); 865 if (!old_entry) { 866 if (IS_ERR(old_page)) 867 err = PTR_ERR(old_page); 868 goto out; 869 } 870 871 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page); 872 if (!new_entry) { 873 if (IS_ERR(new_page)) 874 err = PTR_ERR(new_page); 875 goto out_old; 876 } 877 878 /* prepare for updating ".." directory entry info later */ 879 if (old_dir != new_dir) { 880 if (S_ISDIR(old_inode->i_mode)) { 881 old_dir_entry = f2fs_parent_dir(old_inode, 882 &old_dir_page); 883 if (!old_dir_entry) { 884 if (IS_ERR(old_dir_page)) 885 err = PTR_ERR(old_dir_page); 886 goto out_new; 887 } 888 } 889 890 if (S_ISDIR(new_inode->i_mode)) { 891 new_dir_entry = f2fs_parent_dir(new_inode, 892 &new_dir_page); 893 if (!new_dir_entry) { 894 if (IS_ERR(new_dir_page)) 895 err = PTR_ERR(new_dir_page); 896 goto out_old_dir; 897 } 898 } 899 } 900 901 /* 902 * If cross rename between file and directory those are not 903 * in the same directory, we will inc nlink of file's parent 904 * later, so we should check upper boundary of its nlink. 905 */ 906 if ((!old_dir_entry || !new_dir_entry) && 907 old_dir_entry != new_dir_entry) { 908 old_nlink = old_dir_entry ? -1 : 1; 909 new_nlink = -old_nlink; 910 err = -EMLINK; 911 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) || 912 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX)) 913 goto out_new_dir; 914 } 915 916 f2fs_balance_fs(sbi, true); 917 918 f2fs_lock_op(sbi); 919 920 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name); 921 if (err) 922 goto out_unlock; 923 if (file_enc_name(new_inode)) 924 file_set_enc_name(old_inode); 925 926 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name); 927 if (err) 928 goto out_undo; 929 if (file_enc_name(old_inode)) 930 file_set_enc_name(new_inode); 931 932 /* update ".." directory entry info of old dentry */ 933 if (old_dir_entry) 934 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); 935 936 /* update ".." directory entry info of new dentry */ 937 if (new_dir_entry) 938 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir); 939 940 /* update directory entry info of old dir inode */ 941 f2fs_set_link(old_dir, old_entry, old_page, new_inode); 942 943 down_write(&F2FS_I(old_inode)->i_sem); 944 file_lost_pino(old_inode); 945 up_write(&F2FS_I(old_inode)->i_sem); 946 947 old_dir->i_ctime = current_time(old_dir); 948 if (old_nlink) { 949 down_write(&F2FS_I(old_dir)->i_sem); 950 f2fs_i_links_write(old_dir, old_nlink > 0); 951 up_write(&F2FS_I(old_dir)->i_sem); 952 } 953 f2fs_mark_inode_dirty_sync(old_dir, false); 954 955 /* update directory entry info of new dir inode */ 956 f2fs_set_link(new_dir, new_entry, new_page, old_inode); 957 958 down_write(&F2FS_I(new_inode)->i_sem); 959 file_lost_pino(new_inode); 960 up_write(&F2FS_I(new_inode)->i_sem); 961 962 new_dir->i_ctime = current_time(new_dir); 963 if (new_nlink) { 964 down_write(&F2FS_I(new_dir)->i_sem); 965 f2fs_i_links_write(new_dir, new_nlink > 0); 966 up_write(&F2FS_I(new_dir)->i_sem); 967 } 968 f2fs_mark_inode_dirty_sync(new_dir, false); 969 970 f2fs_unlock_op(sbi); 971 972 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) 973 f2fs_sync_fs(sbi->sb, 1); 974 return 0; 975 out_undo: 976 /* 977 * Still we may fail to recover name info of f2fs_inode here 978 * Drop it, once its name is set as encrypted 979 */ 980 update_dent_inode(old_inode, old_inode, &old_dentry->d_name); 981 out_unlock: 982 f2fs_unlock_op(sbi); 983 out_new_dir: 984 if (new_dir_entry) { 985 f2fs_dentry_kunmap(new_inode, new_dir_page); 986 f2fs_put_page(new_dir_page, 0); 987 } 988 out_old_dir: 989 if (old_dir_entry) { 990 f2fs_dentry_kunmap(old_inode, old_dir_page); 991 f2fs_put_page(old_dir_page, 0); 992 } 993 out_new: 994 f2fs_dentry_kunmap(new_dir, new_page); 995 f2fs_put_page(new_page, 0); 996 out_old: 997 f2fs_dentry_kunmap(old_dir, old_page); 998 f2fs_put_page(old_page, 0); 999 out: 1000 return err; 1001 } 1002 1003 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry, 1004 struct inode *new_dir, struct dentry *new_dentry, 1005 unsigned int flags) 1006 { 1007 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) 1008 return -EINVAL; 1009 1010 if (flags & RENAME_EXCHANGE) { 1011 return f2fs_cross_rename(old_dir, old_dentry, 1012 new_dir, new_dentry); 1013 } 1014 /* 1015 * VFS has already handled the new dentry existence case, 1016 * here, we just deal with "RENAME_NOREPLACE" as regular rename. 1017 */ 1018 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags); 1019 } 1020 1021 static const char *f2fs_encrypted_get_link(struct dentry *dentry, 1022 struct inode *inode, 1023 struct delayed_call *done) 1024 { 1025 struct page *cpage = NULL; 1026 char *caddr, *paddr = NULL; 1027 struct fscrypt_str cstr = FSTR_INIT(NULL, 0); 1028 struct fscrypt_str pstr = FSTR_INIT(NULL, 0); 1029 struct fscrypt_symlink_data *sd; 1030 u32 max_size = inode->i_sb->s_blocksize; 1031 int res; 1032 1033 if (!dentry) 1034 return ERR_PTR(-ECHILD); 1035 1036 res = fscrypt_get_encryption_info(inode); 1037 if (res) 1038 return ERR_PTR(res); 1039 1040 cpage = read_mapping_page(inode->i_mapping, 0, NULL); 1041 if (IS_ERR(cpage)) 1042 return ERR_CAST(cpage); 1043 caddr = page_address(cpage); 1044 1045 /* Symlink is encrypted */ 1046 sd = (struct fscrypt_symlink_data *)caddr; 1047 cstr.name = sd->encrypted_path; 1048 cstr.len = le16_to_cpu(sd->len); 1049 1050 /* this is broken symlink case */ 1051 if (unlikely(cstr.len == 0)) { 1052 res = -ENOENT; 1053 goto errout; 1054 } 1055 1056 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) { 1057 /* Symlink data on the disk is corrupted */ 1058 res = -EIO; 1059 goto errout; 1060 } 1061 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr); 1062 if (res) 1063 goto errout; 1064 1065 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr); 1066 if (res) 1067 goto errout; 1068 1069 /* this is broken symlink case */ 1070 if (unlikely(pstr.name[0] == 0)) { 1071 res = -ENOENT; 1072 goto errout; 1073 } 1074 1075 paddr = pstr.name; 1076 1077 /* Null-terminate the name */ 1078 paddr[pstr.len] = '\0'; 1079 1080 put_page(cpage); 1081 set_delayed_call(done, kfree_link, paddr); 1082 return paddr; 1083 errout: 1084 fscrypt_fname_free_buffer(&pstr); 1085 put_page(cpage); 1086 return ERR_PTR(res); 1087 } 1088 1089 const struct inode_operations f2fs_encrypted_symlink_inode_operations = { 1090 .get_link = f2fs_encrypted_get_link, 1091 .getattr = f2fs_getattr, 1092 .setattr = f2fs_setattr, 1093 #ifdef CONFIG_F2FS_FS_XATTR 1094 .listxattr = f2fs_listxattr, 1095 #endif 1096 }; 1097 1098 const struct inode_operations f2fs_dir_inode_operations = { 1099 .create = f2fs_create, 1100 .lookup = f2fs_lookup, 1101 .link = f2fs_link, 1102 .unlink = f2fs_unlink, 1103 .symlink = f2fs_symlink, 1104 .mkdir = f2fs_mkdir, 1105 .rmdir = f2fs_rmdir, 1106 .mknod = f2fs_mknod, 1107 .rename = f2fs_rename2, 1108 .tmpfile = f2fs_tmpfile, 1109 .getattr = f2fs_getattr, 1110 .setattr = f2fs_setattr, 1111 .get_acl = f2fs_get_acl, 1112 .set_acl = f2fs_set_acl, 1113 #ifdef CONFIG_F2FS_FS_XATTR 1114 .listxattr = f2fs_listxattr, 1115 #endif 1116 }; 1117 1118 const struct inode_operations f2fs_symlink_inode_operations = { 1119 .get_link = f2fs_get_link, 1120 .getattr = f2fs_getattr, 1121 .setattr = f2fs_setattr, 1122 #ifdef CONFIG_F2FS_FS_XATTR 1123 .listxattr = f2fs_listxattr, 1124 #endif 1125 }; 1126 1127 const struct inode_operations f2fs_special_inode_operations = { 1128 .getattr = f2fs_getattr, 1129 .setattr = f2fs_setattr, 1130 .get_acl = f2fs_get_acl, 1131 .set_acl = f2fs_set_acl, 1132 #ifdef CONFIG_F2FS_FS_XATTR 1133 .listxattr = f2fs_listxattr, 1134 #endif 1135 }; 1136