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 (!f2fs_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 if (S_ISDIR(inode->i_mode)) 58 F2FS_I(inode)->i_current_depth = 1; 59 60 err = insert_inode_locked(inode); 61 if (err) { 62 err = -EINVAL; 63 goto fail; 64 } 65 66 if (f2fs_sb_has_project_quota(sbi->sb) && 67 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL)) 68 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid; 69 else 70 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns, 71 F2FS_DEF_PROJID); 72 73 err = dquot_initialize(inode); 74 if (err) 75 goto fail_drop; 76 77 err = dquot_alloc_inode(inode); 78 if (err) 79 goto fail_drop; 80 81 set_inode_flag(inode, FI_NEW_INODE); 82 83 /* If the directory encrypted, then we should encrypt the inode. */ 84 if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) && 85 f2fs_may_encrypt(inode)) 86 f2fs_set_encrypted_inode(inode); 87 88 if (f2fs_sb_has_extra_attr(sbi->sb)) { 89 set_inode_flag(inode, FI_EXTRA_ATTR); 90 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE; 91 } 92 93 if (test_opt(sbi, INLINE_XATTR)) 94 set_inode_flag(inode, FI_INLINE_XATTR); 95 96 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode)) 97 set_inode_flag(inode, FI_INLINE_DATA); 98 if (f2fs_may_inline_dentry(inode)) 99 set_inode_flag(inode, FI_INLINE_DENTRY); 100 101 if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) { 102 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode)); 103 if (f2fs_has_inline_xattr(inode)) 104 xattr_size = F2FS_OPTION(sbi).inline_xattr_size; 105 /* Otherwise, will be 0 */ 106 } else if (f2fs_has_inline_xattr(inode) || 107 f2fs_has_inline_dentry(inode)) { 108 xattr_size = DEFAULT_INLINE_XATTR_ADDRS; 109 } 110 F2FS_I(inode)->i_inline_xattr_size = xattr_size; 111 112 f2fs_init_extent_tree(inode, NULL); 113 114 stat_inc_inline_xattr(inode); 115 stat_inc_inline_inode(inode); 116 stat_inc_inline_dir(inode); 117 118 F2FS_I(inode)->i_flags = 119 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED); 120 121 if (S_ISDIR(inode->i_mode)) 122 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL; 123 124 if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL) 125 set_inode_flag(inode, FI_PROJ_INHERIT); 126 127 trace_f2fs_new_inode(inode, 0); 128 return inode; 129 130 fail: 131 trace_f2fs_new_inode(inode, err); 132 make_bad_inode(inode); 133 if (nid_free) 134 set_inode_flag(inode, FI_FREE_NID); 135 iput(inode); 136 return ERR_PTR(err); 137 fail_drop: 138 trace_f2fs_new_inode(inode, err); 139 dquot_drop(inode); 140 inode->i_flags |= S_NOQUOTA; 141 if (nid_free) 142 set_inode_flag(inode, FI_FREE_NID); 143 clear_nlink(inode); 144 unlock_new_inode(inode); 145 iput(inode); 146 return ERR_PTR(err); 147 } 148 149 static int is_extension_exist(const unsigned char *s, const char *sub) 150 { 151 size_t slen = strlen(s); 152 size_t sublen = strlen(sub); 153 int i; 154 155 /* 156 * filename format of multimedia file should be defined as: 157 * "filename + '.' + extension + (optional: '.' + temp extension)". 158 */ 159 if (slen < sublen + 2) 160 return 0; 161 162 for (i = 1; i < slen - sublen; i++) { 163 if (s[i] != '.') 164 continue; 165 if (!strncasecmp(s + i + 1, sub, sublen)) 166 return 1; 167 } 168 169 return 0; 170 } 171 172 /* 173 * Set multimedia files as cold files for hot/cold data separation 174 */ 175 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode, 176 const unsigned char *name) 177 { 178 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list; 179 int i, cold_count, hot_count; 180 181 down_read(&sbi->sb_lock); 182 183 cold_count = le32_to_cpu(sbi->raw_super->extension_count); 184 hot_count = sbi->raw_super->hot_ext_count; 185 186 for (i = 0; i < cold_count + hot_count; i++) { 187 if (!is_extension_exist(name, extlist[i])) 188 continue; 189 if (i < cold_count) 190 file_set_cold(inode); 191 else 192 file_set_hot(inode); 193 break; 194 } 195 196 up_read(&sbi->sb_lock); 197 } 198 199 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name, 200 bool hot, bool set) 201 { 202 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list; 203 int cold_count = le32_to_cpu(sbi->raw_super->extension_count); 204 int hot_count = sbi->raw_super->hot_ext_count; 205 int total_count = cold_count + hot_count; 206 int start, count; 207 int i; 208 209 if (set) { 210 if (total_count == F2FS_MAX_EXTENSION) 211 return -EINVAL; 212 } else { 213 if (!hot && !cold_count) 214 return -EINVAL; 215 if (hot && !hot_count) 216 return -EINVAL; 217 } 218 219 if (hot) { 220 start = cold_count; 221 count = total_count; 222 } else { 223 start = 0; 224 count = cold_count; 225 } 226 227 for (i = start; i < count; i++) { 228 if (strcmp(name, extlist[i])) 229 continue; 230 231 if (set) 232 return -EINVAL; 233 234 memcpy(extlist[i], extlist[i + 1], 235 F2FS_EXTENSION_LEN * (total_count - i - 1)); 236 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN); 237 if (hot) 238 sbi->raw_super->hot_ext_count = hot_count - 1; 239 else 240 sbi->raw_super->extension_count = 241 cpu_to_le32(cold_count - 1); 242 return 0; 243 } 244 245 if (!set) 246 return -EINVAL; 247 248 if (hot) { 249 strncpy(extlist[count], name, strlen(name)); 250 sbi->raw_super->hot_ext_count = hot_count + 1; 251 } else { 252 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN]; 253 254 memcpy(buf, &extlist[cold_count], 255 F2FS_EXTENSION_LEN * hot_count); 256 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN); 257 strncpy(extlist[cold_count], name, strlen(name)); 258 memcpy(&extlist[cold_count + 1], buf, 259 F2FS_EXTENSION_LEN * hot_count); 260 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1); 261 } 262 return 0; 263 } 264 265 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 266 bool excl) 267 { 268 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 269 struct inode *inode; 270 nid_t ino = 0; 271 int err; 272 273 if (unlikely(f2fs_cp_error(sbi))) 274 return -EIO; 275 276 err = dquot_initialize(dir); 277 if (err) 278 return err; 279 280 inode = f2fs_new_inode(dir, mode); 281 if (IS_ERR(inode)) 282 return PTR_ERR(inode); 283 284 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) 285 set_file_temperature(sbi, inode, dentry->d_name.name); 286 287 inode->i_op = &f2fs_file_inode_operations; 288 inode->i_fop = &f2fs_file_operations; 289 inode->i_mapping->a_ops = &f2fs_dblock_aops; 290 ino = inode->i_ino; 291 292 f2fs_lock_op(sbi); 293 err = f2fs_add_link(dentry, inode); 294 if (err) 295 goto out; 296 f2fs_unlock_op(sbi); 297 298 f2fs_alloc_nid_done(sbi, ino); 299 300 d_instantiate_new(dentry, inode); 301 302 if (IS_DIRSYNC(dir)) 303 f2fs_sync_fs(sbi->sb, 1); 304 305 f2fs_balance_fs(sbi, true); 306 return 0; 307 out: 308 f2fs_handle_failed_inode(inode); 309 return err; 310 } 311 312 static int f2fs_link(struct dentry *old_dentry, struct inode *dir, 313 struct dentry *dentry) 314 { 315 struct inode *inode = d_inode(old_dentry); 316 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 317 int err; 318 319 if (unlikely(f2fs_cp_error(sbi))) 320 return -EIO; 321 322 err = fscrypt_prepare_link(old_dentry, dir, dentry); 323 if (err) 324 return err; 325 326 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) && 327 (!projid_eq(F2FS_I(dir)->i_projid, 328 F2FS_I(old_dentry->d_inode)->i_projid))) 329 return -EXDEV; 330 331 err = dquot_initialize(dir); 332 if (err) 333 return err; 334 335 f2fs_balance_fs(sbi, true); 336 337 inode->i_ctime = current_time(inode); 338 ihold(inode); 339 340 set_inode_flag(inode, FI_INC_LINK); 341 f2fs_lock_op(sbi); 342 err = f2fs_add_link(dentry, inode); 343 if (err) 344 goto out; 345 f2fs_unlock_op(sbi); 346 347 d_instantiate(dentry, inode); 348 349 if (IS_DIRSYNC(dir)) 350 f2fs_sync_fs(sbi->sb, 1); 351 return 0; 352 out: 353 clear_inode_flag(inode, FI_INC_LINK); 354 iput(inode); 355 f2fs_unlock_op(sbi); 356 return err; 357 } 358 359 struct dentry *f2fs_get_parent(struct dentry *child) 360 { 361 struct qstr dotdot = QSTR_INIT("..", 2); 362 struct page *page; 363 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page); 364 if (!ino) { 365 if (IS_ERR(page)) 366 return ERR_CAST(page); 367 return ERR_PTR(-ENOENT); 368 } 369 return d_obtain_alias(f2fs_iget(child->d_sb, ino)); 370 } 371 372 static int __recover_dot_dentries(struct inode *dir, nid_t pino) 373 { 374 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 375 struct qstr dot = QSTR_INIT(".", 1); 376 struct qstr dotdot = QSTR_INIT("..", 2); 377 struct f2fs_dir_entry *de; 378 struct page *page; 379 int err = 0; 380 381 if (f2fs_readonly(sbi->sb)) { 382 f2fs_msg(sbi->sb, KERN_INFO, 383 "skip recovering inline_dots inode (ino:%lu, pino:%u) " 384 "in readonly mountpoint", dir->i_ino, pino); 385 return 0; 386 } 387 388 err = dquot_initialize(dir); 389 if (err) 390 return err; 391 392 f2fs_balance_fs(sbi, true); 393 394 f2fs_lock_op(sbi); 395 396 de = f2fs_find_entry(dir, &dot, &page); 397 if (de) { 398 f2fs_put_page(page, 0); 399 } else if (IS_ERR(page)) { 400 err = PTR_ERR(page); 401 goto out; 402 } else { 403 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR); 404 if (err) 405 goto out; 406 } 407 408 de = f2fs_find_entry(dir, &dotdot, &page); 409 if (de) 410 f2fs_put_page(page, 0); 411 else if (IS_ERR(page)) 412 err = PTR_ERR(page); 413 else 414 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR); 415 out: 416 if (!err) 417 clear_inode_flag(dir, FI_INLINE_DOTS); 418 419 f2fs_unlock_op(sbi); 420 return err; 421 } 422 423 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, 424 unsigned int flags) 425 { 426 struct inode *inode = NULL; 427 struct f2fs_dir_entry *de; 428 struct page *page; 429 struct dentry *new; 430 nid_t ino = -1; 431 int err = 0; 432 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir)); 433 434 trace_f2fs_lookup_start(dir, dentry, flags); 435 436 err = fscrypt_prepare_lookup(dir, dentry, flags); 437 if (err) 438 goto out; 439 440 if (dentry->d_name.len > F2FS_NAME_LEN) { 441 err = -ENAMETOOLONG; 442 goto out; 443 } 444 445 de = f2fs_find_entry(dir, &dentry->d_name, &page); 446 if (!de) { 447 if (IS_ERR(page)) { 448 err = PTR_ERR(page); 449 goto out; 450 } 451 goto out_splice; 452 } 453 454 ino = le32_to_cpu(de->ino); 455 f2fs_put_page(page, 0); 456 457 inode = f2fs_iget(dir->i_sb, ino); 458 if (IS_ERR(inode)) { 459 err = PTR_ERR(inode); 460 goto out; 461 } 462 463 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) { 464 err = __recover_dot_dentries(dir, root_ino); 465 if (err) 466 goto out_iput; 467 } 468 469 if (f2fs_has_inline_dots(inode)) { 470 err = __recover_dot_dentries(inode, dir->i_ino); 471 if (err) 472 goto out_iput; 473 } 474 if (f2fs_encrypted_inode(dir) && 475 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && 476 !fscrypt_has_permitted_context(dir, inode)) { 477 f2fs_msg(inode->i_sb, KERN_WARNING, 478 "Inconsistent encryption contexts: %lu/%lu", 479 dir->i_ino, inode->i_ino); 480 err = -EPERM; 481 goto out_iput; 482 } 483 out_splice: 484 new = d_splice_alias(inode, dentry); 485 if (IS_ERR(new)) 486 err = PTR_ERR(new); 487 trace_f2fs_lookup_end(dir, dentry, ino, err); 488 return new; 489 out_iput: 490 iput(inode); 491 out: 492 trace_f2fs_lookup_end(dir, dentry, ino, err); 493 return ERR_PTR(err); 494 } 495 496 static int f2fs_unlink(struct inode *dir, struct dentry *dentry) 497 { 498 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 499 struct inode *inode = d_inode(dentry); 500 struct f2fs_dir_entry *de; 501 struct page *page; 502 int err = -ENOENT; 503 504 trace_f2fs_unlink_enter(dir, dentry); 505 506 if (unlikely(f2fs_cp_error(sbi))) 507 return -EIO; 508 509 err = dquot_initialize(dir); 510 if (err) 511 return err; 512 err = dquot_initialize(inode); 513 if (err) 514 return err; 515 516 de = f2fs_find_entry(dir, &dentry->d_name, &page); 517 if (!de) { 518 if (IS_ERR(page)) 519 err = PTR_ERR(page); 520 goto fail; 521 } 522 523 f2fs_balance_fs(sbi, true); 524 525 f2fs_lock_op(sbi); 526 err = f2fs_acquire_orphan_inode(sbi); 527 if (err) { 528 f2fs_unlock_op(sbi); 529 f2fs_put_page(page, 0); 530 goto fail; 531 } 532 f2fs_delete_entry(de, page, dir, inode); 533 f2fs_unlock_op(sbi); 534 535 if (IS_DIRSYNC(dir)) 536 f2fs_sync_fs(sbi->sb, 1); 537 fail: 538 trace_f2fs_unlink_exit(inode, err); 539 return err; 540 } 541 542 static const char *f2fs_get_link(struct dentry *dentry, 543 struct inode *inode, 544 struct delayed_call *done) 545 { 546 const char *link = page_get_link(dentry, inode, done); 547 if (!IS_ERR(link) && !*link) { 548 /* this is broken symlink case */ 549 do_delayed_call(done); 550 clear_delayed_call(done); 551 link = ERR_PTR(-ENOENT); 552 } 553 return link; 554 } 555 556 static int f2fs_symlink(struct inode *dir, struct dentry *dentry, 557 const char *symname) 558 { 559 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 560 struct inode *inode; 561 size_t len = strlen(symname); 562 struct fscrypt_str disk_link; 563 int err; 564 565 if (unlikely(f2fs_cp_error(sbi))) 566 return -EIO; 567 568 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize, 569 &disk_link); 570 if (err) 571 return err; 572 573 err = dquot_initialize(dir); 574 if (err) 575 return err; 576 577 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); 578 if (IS_ERR(inode)) 579 return PTR_ERR(inode); 580 581 if (IS_ENCRYPTED(inode)) 582 inode->i_op = &f2fs_encrypted_symlink_inode_operations; 583 else 584 inode->i_op = &f2fs_symlink_inode_operations; 585 inode_nohighmem(inode); 586 inode->i_mapping->a_ops = &f2fs_dblock_aops; 587 588 f2fs_lock_op(sbi); 589 err = f2fs_add_link(dentry, inode); 590 if (err) 591 goto out_f2fs_handle_failed_inode; 592 f2fs_unlock_op(sbi); 593 f2fs_alloc_nid_done(sbi, inode->i_ino); 594 595 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); 596 if (err) 597 goto err_out; 598 599 err = page_symlink(inode, disk_link.name, disk_link.len); 600 601 err_out: 602 d_instantiate_new(dentry, inode); 603 604 /* 605 * Let's flush symlink data in order to avoid broken symlink as much as 606 * possible. Nevertheless, fsyncing is the best way, but there is no 607 * way to get a file descriptor in order to flush that. 608 * 609 * Note that, it needs to do dir->fsync to make this recoverable. 610 * If the symlink path is stored into inline_data, there is no 611 * performance regression. 612 */ 613 if (!err) { 614 filemap_write_and_wait_range(inode->i_mapping, 0, 615 disk_link.len - 1); 616 617 if (IS_DIRSYNC(dir)) 618 f2fs_sync_fs(sbi->sb, 1); 619 } else { 620 f2fs_unlink(dir, dentry); 621 } 622 623 f2fs_balance_fs(sbi, true); 624 goto out_free_encrypted_link; 625 626 out_f2fs_handle_failed_inode: 627 f2fs_handle_failed_inode(inode); 628 out_free_encrypted_link: 629 if (disk_link.name != (unsigned char *)symname) 630 kfree(disk_link.name); 631 return err; 632 } 633 634 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 635 { 636 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 637 struct inode *inode; 638 int err; 639 640 if (unlikely(f2fs_cp_error(sbi))) 641 return -EIO; 642 643 err = dquot_initialize(dir); 644 if (err) 645 return err; 646 647 inode = f2fs_new_inode(dir, S_IFDIR | mode); 648 if (IS_ERR(inode)) 649 return PTR_ERR(inode); 650 651 inode->i_op = &f2fs_dir_inode_operations; 652 inode->i_fop = &f2fs_dir_operations; 653 inode->i_mapping->a_ops = &f2fs_dblock_aops; 654 inode_nohighmem(inode); 655 656 set_inode_flag(inode, FI_INC_LINK); 657 f2fs_lock_op(sbi); 658 err = f2fs_add_link(dentry, inode); 659 if (err) 660 goto out_fail; 661 f2fs_unlock_op(sbi); 662 663 f2fs_alloc_nid_done(sbi, inode->i_ino); 664 665 d_instantiate_new(dentry, inode); 666 667 if (IS_DIRSYNC(dir)) 668 f2fs_sync_fs(sbi->sb, 1); 669 670 f2fs_balance_fs(sbi, true); 671 return 0; 672 673 out_fail: 674 clear_inode_flag(inode, FI_INC_LINK); 675 f2fs_handle_failed_inode(inode); 676 return err; 677 } 678 679 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) 680 { 681 struct inode *inode = d_inode(dentry); 682 if (f2fs_empty_dir(inode)) 683 return f2fs_unlink(dir, dentry); 684 return -ENOTEMPTY; 685 } 686 687 static int f2fs_mknod(struct inode *dir, struct dentry *dentry, 688 umode_t mode, dev_t rdev) 689 { 690 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 691 struct inode *inode; 692 int err = 0; 693 694 if (unlikely(f2fs_cp_error(sbi))) 695 return -EIO; 696 697 err = dquot_initialize(dir); 698 if (err) 699 return err; 700 701 inode = f2fs_new_inode(dir, mode); 702 if (IS_ERR(inode)) 703 return PTR_ERR(inode); 704 705 init_special_inode(inode, inode->i_mode, rdev); 706 inode->i_op = &f2fs_special_inode_operations; 707 708 f2fs_lock_op(sbi); 709 err = f2fs_add_link(dentry, inode); 710 if (err) 711 goto out; 712 f2fs_unlock_op(sbi); 713 714 f2fs_alloc_nid_done(sbi, inode->i_ino); 715 716 d_instantiate_new(dentry, inode); 717 718 if (IS_DIRSYNC(dir)) 719 f2fs_sync_fs(sbi->sb, 1); 720 721 f2fs_balance_fs(sbi, true); 722 return 0; 723 out: 724 f2fs_handle_failed_inode(inode); 725 return err; 726 } 727 728 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry, 729 umode_t mode, struct inode **whiteout) 730 { 731 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 732 struct inode *inode; 733 int err; 734 735 err = dquot_initialize(dir); 736 if (err) 737 return err; 738 739 inode = f2fs_new_inode(dir, mode); 740 if (IS_ERR(inode)) 741 return PTR_ERR(inode); 742 743 if (whiteout) { 744 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); 745 inode->i_op = &f2fs_special_inode_operations; 746 } else { 747 inode->i_op = &f2fs_file_inode_operations; 748 inode->i_fop = &f2fs_file_operations; 749 inode->i_mapping->a_ops = &f2fs_dblock_aops; 750 } 751 752 f2fs_lock_op(sbi); 753 err = f2fs_acquire_orphan_inode(sbi); 754 if (err) 755 goto out; 756 757 err = f2fs_do_tmpfile(inode, dir); 758 if (err) 759 goto release_out; 760 761 /* 762 * add this non-linked tmpfile to orphan list, in this way we could 763 * remove all unused data of tmpfile after abnormal power-off. 764 */ 765 f2fs_add_orphan_inode(inode); 766 f2fs_alloc_nid_done(sbi, inode->i_ino); 767 768 if (whiteout) { 769 f2fs_i_links_write(inode, false); 770 *whiteout = inode; 771 } else { 772 d_tmpfile(dentry, inode); 773 } 774 /* link_count was changed by d_tmpfile as well. */ 775 f2fs_unlock_op(sbi); 776 unlock_new_inode(inode); 777 778 f2fs_balance_fs(sbi, true); 779 return 0; 780 781 release_out: 782 f2fs_release_orphan_inode(sbi); 783 out: 784 f2fs_handle_failed_inode(inode); 785 return err; 786 } 787 788 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) 789 { 790 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 791 792 if (unlikely(f2fs_cp_error(sbi))) 793 return -EIO; 794 795 if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) { 796 int err = fscrypt_get_encryption_info(dir); 797 if (err) 798 return err; 799 } 800 801 return __f2fs_tmpfile(dir, dentry, mode, NULL); 802 } 803 804 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout) 805 { 806 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir)))) 807 return -EIO; 808 809 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout); 810 } 811 812 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, 813 struct inode *new_dir, struct dentry *new_dentry, 814 unsigned int flags) 815 { 816 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); 817 struct inode *old_inode = d_inode(old_dentry); 818 struct inode *new_inode = d_inode(new_dentry); 819 struct inode *whiteout = NULL; 820 struct page *old_dir_page; 821 struct page *old_page, *new_page = NULL; 822 struct f2fs_dir_entry *old_dir_entry = NULL; 823 struct f2fs_dir_entry *old_entry; 824 struct f2fs_dir_entry *new_entry; 825 bool is_old_inline = f2fs_has_inline_dentry(old_dir); 826 int err = -ENOENT; 827 828 if (unlikely(f2fs_cp_error(sbi))) 829 return -EIO; 830 831 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && 832 (!projid_eq(F2FS_I(new_dir)->i_projid, 833 F2FS_I(old_dentry->d_inode)->i_projid))) 834 return -EXDEV; 835 836 err = dquot_initialize(old_dir); 837 if (err) 838 goto out; 839 840 err = dquot_initialize(new_dir); 841 if (err) 842 goto out; 843 844 if (new_inode) { 845 err = dquot_initialize(new_inode); 846 if (err) 847 goto out; 848 } 849 850 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); 851 if (!old_entry) { 852 if (IS_ERR(old_page)) 853 err = PTR_ERR(old_page); 854 goto out; 855 } 856 857 if (S_ISDIR(old_inode->i_mode)) { 858 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); 859 if (!old_dir_entry) { 860 if (IS_ERR(old_dir_page)) 861 err = PTR_ERR(old_dir_page); 862 goto out_old; 863 } 864 } 865 866 if (flags & RENAME_WHITEOUT) { 867 err = f2fs_create_whiteout(old_dir, &whiteout); 868 if (err) 869 goto out_dir; 870 } 871 872 if (new_inode) { 873 874 err = -ENOTEMPTY; 875 if (old_dir_entry && !f2fs_empty_dir(new_inode)) 876 goto out_whiteout; 877 878 err = -ENOENT; 879 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, 880 &new_page); 881 if (!new_entry) { 882 if (IS_ERR(new_page)) 883 err = PTR_ERR(new_page); 884 goto out_whiteout; 885 } 886 887 f2fs_balance_fs(sbi, true); 888 889 f2fs_lock_op(sbi); 890 891 err = f2fs_acquire_orphan_inode(sbi); 892 if (err) 893 goto put_out_dir; 894 895 f2fs_set_link(new_dir, new_entry, new_page, old_inode); 896 897 new_inode->i_ctime = current_time(new_inode); 898 down_write(&F2FS_I(new_inode)->i_sem); 899 if (old_dir_entry) 900 f2fs_i_links_write(new_inode, false); 901 f2fs_i_links_write(new_inode, false); 902 up_write(&F2FS_I(new_inode)->i_sem); 903 904 if (!new_inode->i_nlink) 905 f2fs_add_orphan_inode(new_inode); 906 else 907 f2fs_release_orphan_inode(sbi); 908 } else { 909 f2fs_balance_fs(sbi, true); 910 911 f2fs_lock_op(sbi); 912 913 err = f2fs_add_link(new_dentry, old_inode); 914 if (err) { 915 f2fs_unlock_op(sbi); 916 goto out_whiteout; 917 } 918 919 if (old_dir_entry) 920 f2fs_i_links_write(new_dir, true); 921 922 /* 923 * old entry and new entry can locate in the same inline 924 * dentry in inode, when attaching new entry in inline dentry, 925 * it could force inline dentry conversion, after that, 926 * old_entry and old_page will point to wrong address, in 927 * order to avoid this, let's do the check and update here. 928 */ 929 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) { 930 f2fs_put_page(old_page, 0); 931 old_page = NULL; 932 933 old_entry = f2fs_find_entry(old_dir, 934 &old_dentry->d_name, &old_page); 935 if (!old_entry) { 936 err = -ENOENT; 937 if (IS_ERR(old_page)) 938 err = PTR_ERR(old_page); 939 f2fs_unlock_op(sbi); 940 goto out_whiteout; 941 } 942 } 943 } 944 945 down_write(&F2FS_I(old_inode)->i_sem); 946 if (!old_dir_entry || whiteout) 947 file_lost_pino(old_inode); 948 else 949 F2FS_I(old_inode)->i_pino = new_dir->i_ino; 950 up_write(&F2FS_I(old_inode)->i_sem); 951 952 old_inode->i_ctime = current_time(old_inode); 953 f2fs_mark_inode_dirty_sync(old_inode, false); 954 955 f2fs_delete_entry(old_entry, old_page, old_dir, NULL); 956 957 if (whiteout) { 958 whiteout->i_state |= I_LINKABLE; 959 set_inode_flag(whiteout, FI_INC_LINK); 960 err = f2fs_add_link(old_dentry, whiteout); 961 if (err) 962 goto put_out_dir; 963 whiteout->i_state &= ~I_LINKABLE; 964 iput(whiteout); 965 } 966 967 if (old_dir_entry) { 968 if (old_dir != new_dir && !whiteout) 969 f2fs_set_link(old_inode, old_dir_entry, 970 old_dir_page, new_dir); 971 else 972 f2fs_put_page(old_dir_page, 0); 973 f2fs_i_links_write(old_dir, false); 974 } 975 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) { 976 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO); 977 if (S_ISDIR(old_inode->i_mode)) 978 f2fs_add_ino_entry(sbi, old_inode->i_ino, 979 TRANS_DIR_INO); 980 } 981 982 f2fs_unlock_op(sbi); 983 984 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) 985 f2fs_sync_fs(sbi->sb, 1); 986 return 0; 987 988 put_out_dir: 989 f2fs_unlock_op(sbi); 990 if (new_page) 991 f2fs_put_page(new_page, 0); 992 out_whiteout: 993 if (whiteout) 994 iput(whiteout); 995 out_dir: 996 if (old_dir_entry) 997 f2fs_put_page(old_dir_page, 0); 998 out_old: 999 f2fs_put_page(old_page, 0); 1000 out: 1001 return err; 1002 } 1003 1004 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry, 1005 struct inode *new_dir, struct dentry *new_dentry) 1006 { 1007 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); 1008 struct inode *old_inode = d_inode(old_dentry); 1009 struct inode *new_inode = d_inode(new_dentry); 1010 struct page *old_dir_page, *new_dir_page; 1011 struct page *old_page, *new_page; 1012 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL; 1013 struct f2fs_dir_entry *old_entry, *new_entry; 1014 int old_nlink = 0, new_nlink = 0; 1015 int err = -ENOENT; 1016 1017 if (unlikely(f2fs_cp_error(sbi))) 1018 return -EIO; 1019 1020 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && 1021 !projid_eq(F2FS_I(new_dir)->i_projid, 1022 F2FS_I(old_dentry->d_inode)->i_projid)) || 1023 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && 1024 !projid_eq(F2FS_I(old_dir)->i_projid, 1025 F2FS_I(new_dentry->d_inode)->i_projid))) 1026 return -EXDEV; 1027 1028 err = dquot_initialize(old_dir); 1029 if (err) 1030 goto out; 1031 1032 err = dquot_initialize(new_dir); 1033 if (err) 1034 goto out; 1035 1036 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); 1037 if (!old_entry) { 1038 if (IS_ERR(old_page)) 1039 err = PTR_ERR(old_page); 1040 goto out; 1041 } 1042 1043 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page); 1044 if (!new_entry) { 1045 if (IS_ERR(new_page)) 1046 err = PTR_ERR(new_page); 1047 goto out_old; 1048 } 1049 1050 /* prepare for updating ".." directory entry info later */ 1051 if (old_dir != new_dir) { 1052 if (S_ISDIR(old_inode->i_mode)) { 1053 old_dir_entry = f2fs_parent_dir(old_inode, 1054 &old_dir_page); 1055 if (!old_dir_entry) { 1056 if (IS_ERR(old_dir_page)) 1057 err = PTR_ERR(old_dir_page); 1058 goto out_new; 1059 } 1060 } 1061 1062 if (S_ISDIR(new_inode->i_mode)) { 1063 new_dir_entry = f2fs_parent_dir(new_inode, 1064 &new_dir_page); 1065 if (!new_dir_entry) { 1066 if (IS_ERR(new_dir_page)) 1067 err = PTR_ERR(new_dir_page); 1068 goto out_old_dir; 1069 } 1070 } 1071 } 1072 1073 /* 1074 * If cross rename between file and directory those are not 1075 * in the same directory, we will inc nlink of file's parent 1076 * later, so we should check upper boundary of its nlink. 1077 */ 1078 if ((!old_dir_entry || !new_dir_entry) && 1079 old_dir_entry != new_dir_entry) { 1080 old_nlink = old_dir_entry ? -1 : 1; 1081 new_nlink = -old_nlink; 1082 err = -EMLINK; 1083 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) || 1084 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX)) 1085 goto out_new_dir; 1086 } 1087 1088 f2fs_balance_fs(sbi, true); 1089 1090 f2fs_lock_op(sbi); 1091 1092 /* update ".." directory entry info of old dentry */ 1093 if (old_dir_entry) 1094 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); 1095 1096 /* update ".." directory entry info of new dentry */ 1097 if (new_dir_entry) 1098 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir); 1099 1100 /* update directory entry info of old dir inode */ 1101 f2fs_set_link(old_dir, old_entry, old_page, new_inode); 1102 1103 down_write(&F2FS_I(old_inode)->i_sem); 1104 file_lost_pino(old_inode); 1105 up_write(&F2FS_I(old_inode)->i_sem); 1106 1107 old_dir->i_ctime = current_time(old_dir); 1108 if (old_nlink) { 1109 down_write(&F2FS_I(old_dir)->i_sem); 1110 f2fs_i_links_write(old_dir, old_nlink > 0); 1111 up_write(&F2FS_I(old_dir)->i_sem); 1112 } 1113 f2fs_mark_inode_dirty_sync(old_dir, false); 1114 1115 /* update directory entry info of new dir inode */ 1116 f2fs_set_link(new_dir, new_entry, new_page, old_inode); 1117 1118 down_write(&F2FS_I(new_inode)->i_sem); 1119 file_lost_pino(new_inode); 1120 up_write(&F2FS_I(new_inode)->i_sem); 1121 1122 new_dir->i_ctime = current_time(new_dir); 1123 if (new_nlink) { 1124 down_write(&F2FS_I(new_dir)->i_sem); 1125 f2fs_i_links_write(new_dir, new_nlink > 0); 1126 up_write(&F2FS_I(new_dir)->i_sem); 1127 } 1128 f2fs_mark_inode_dirty_sync(new_dir, false); 1129 1130 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) { 1131 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO); 1132 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO); 1133 } 1134 1135 f2fs_unlock_op(sbi); 1136 1137 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) 1138 f2fs_sync_fs(sbi->sb, 1); 1139 return 0; 1140 out_new_dir: 1141 if (new_dir_entry) { 1142 f2fs_put_page(new_dir_page, 0); 1143 } 1144 out_old_dir: 1145 if (old_dir_entry) { 1146 f2fs_put_page(old_dir_page, 0); 1147 } 1148 out_new: 1149 f2fs_put_page(new_page, 0); 1150 out_old: 1151 f2fs_put_page(old_page, 0); 1152 out: 1153 return err; 1154 } 1155 1156 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry, 1157 struct inode *new_dir, struct dentry *new_dentry, 1158 unsigned int flags) 1159 { 1160 int err; 1161 1162 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) 1163 return -EINVAL; 1164 1165 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, 1166 flags); 1167 if (err) 1168 return err; 1169 1170 if (flags & RENAME_EXCHANGE) { 1171 return f2fs_cross_rename(old_dir, old_dentry, 1172 new_dir, new_dentry); 1173 } 1174 /* 1175 * VFS has already handled the new dentry existence case, 1176 * here, we just deal with "RENAME_NOREPLACE" as regular rename. 1177 */ 1178 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags); 1179 } 1180 1181 static const char *f2fs_encrypted_get_link(struct dentry *dentry, 1182 struct inode *inode, 1183 struct delayed_call *done) 1184 { 1185 struct page *page; 1186 const char *target; 1187 1188 if (!dentry) 1189 return ERR_PTR(-ECHILD); 1190 1191 page = read_mapping_page(inode->i_mapping, 0, NULL); 1192 if (IS_ERR(page)) 1193 return ERR_CAST(page); 1194 1195 target = fscrypt_get_symlink(inode, page_address(page), 1196 inode->i_sb->s_blocksize, done); 1197 put_page(page); 1198 return target; 1199 } 1200 1201 const struct inode_operations f2fs_encrypted_symlink_inode_operations = { 1202 .get_link = f2fs_encrypted_get_link, 1203 .getattr = f2fs_getattr, 1204 .setattr = f2fs_setattr, 1205 #ifdef CONFIG_F2FS_FS_XATTR 1206 .listxattr = f2fs_listxattr, 1207 #endif 1208 }; 1209 1210 const struct inode_operations f2fs_dir_inode_operations = { 1211 .create = f2fs_create, 1212 .lookup = f2fs_lookup, 1213 .link = f2fs_link, 1214 .unlink = f2fs_unlink, 1215 .symlink = f2fs_symlink, 1216 .mkdir = f2fs_mkdir, 1217 .rmdir = f2fs_rmdir, 1218 .mknod = f2fs_mknod, 1219 .rename = f2fs_rename2, 1220 .tmpfile = f2fs_tmpfile, 1221 .getattr = f2fs_getattr, 1222 .setattr = f2fs_setattr, 1223 .get_acl = f2fs_get_acl, 1224 .set_acl = f2fs_set_acl, 1225 #ifdef CONFIG_F2FS_FS_XATTR 1226 .listxattr = f2fs_listxattr, 1227 #endif 1228 }; 1229 1230 const struct inode_operations f2fs_symlink_inode_operations = { 1231 .get_link = f2fs_get_link, 1232 .getattr = f2fs_getattr, 1233 .setattr = f2fs_setattr, 1234 #ifdef CONFIG_F2FS_FS_XATTR 1235 .listxattr = f2fs_listxattr, 1236 #endif 1237 }; 1238 1239 const struct inode_operations f2fs_special_inode_operations = { 1240 .getattr = f2fs_getattr, 1241 .setattr = f2fs_setattr, 1242 .get_acl = f2fs_get_acl, 1243 .set_acl = f2fs_set_acl, 1244 #ifdef CONFIG_F2FS_FS_XATTR 1245 .listxattr = f2fs_listxattr, 1246 #endif 1247 }; 1248