1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/f2fs/namei.c 4 * 5 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 6 * http://www.samsung.com/ 7 */ 8 #include <linux/fs.h> 9 #include <linux/f2fs_fs.h> 10 #include <linux/pagemap.h> 11 #include <linux/sched.h> 12 #include <linux/ctype.h> 13 #include <linux/random.h> 14 #include <linux/dcache.h> 15 #include <linux/namei.h> 16 #include <linux/quotaops.h> 17 18 #include "f2fs.h" 19 #include "node.h" 20 #include "segment.h" 21 #include "xattr.h" 22 #include "acl.h" 23 #include <trace/events/f2fs.h> 24 25 static inline bool is_extension_exist(const unsigned char *s, const char *sub, 26 bool tmp_ext, bool tmp_dot) 27 { 28 size_t slen = strlen(s); 29 size_t sublen = strlen(sub); 30 int i; 31 32 if (sublen == 1 && *sub == '*') 33 return true; 34 35 /* 36 * filename format of multimedia file should be defined as: 37 * "filename + '.' + extension + (optional: '.' + temp extension)". 38 */ 39 if (slen < sublen + 2) 40 return false; 41 42 if (!tmp_ext) { 43 /* file has no temp extension */ 44 if (s[slen - sublen - 1] != '.') 45 return false; 46 return !strncasecmp(s + slen - sublen, sub, sublen); 47 } 48 49 for (i = 1; i < slen - sublen; i++) { 50 if (s[i] != '.') 51 continue; 52 if (!strncasecmp(s + i + 1, sub, sublen)) { 53 if (!tmp_dot) 54 return true; 55 if (i == slen - sublen - 1 || s[i + 1 + sublen] == '.') 56 return true; 57 } 58 } 59 60 return false; 61 } 62 63 static inline bool is_temperature_extension(const unsigned char *s, const char *sub) 64 { 65 return is_extension_exist(s, sub, true, false); 66 } 67 68 static inline bool is_compress_extension(const unsigned char *s, const char *sub) 69 { 70 return is_extension_exist(s, sub, true, true); 71 } 72 73 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name, 74 bool hot, bool set) 75 { 76 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list; 77 int cold_count = le32_to_cpu(sbi->raw_super->extension_count); 78 int hot_count = sbi->raw_super->hot_ext_count; 79 int total_count = cold_count + hot_count; 80 int start, count; 81 int i; 82 83 if (set) { 84 if (total_count == F2FS_MAX_EXTENSION) 85 return -EINVAL; 86 } else { 87 if (!hot && !cold_count) 88 return -EINVAL; 89 if (hot && !hot_count) 90 return -EINVAL; 91 } 92 93 if (hot) { 94 start = cold_count; 95 count = total_count; 96 } else { 97 start = 0; 98 count = cold_count; 99 } 100 101 for (i = start; i < count; i++) { 102 if (strcmp(name, extlist[i])) 103 continue; 104 105 if (set) 106 return -EINVAL; 107 108 memcpy(extlist[i], extlist[i + 1], 109 F2FS_EXTENSION_LEN * (total_count - i - 1)); 110 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN); 111 if (hot) 112 sbi->raw_super->hot_ext_count = hot_count - 1; 113 else 114 sbi->raw_super->extension_count = 115 cpu_to_le32(cold_count - 1); 116 return 0; 117 } 118 119 if (!set) 120 return -EINVAL; 121 122 if (hot) { 123 memcpy(extlist[count], name, strlen(name)); 124 sbi->raw_super->hot_ext_count = hot_count + 1; 125 } else { 126 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN]; 127 128 memcpy(buf, &extlist[cold_count], 129 F2FS_EXTENSION_LEN * hot_count); 130 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN); 131 memcpy(extlist[cold_count], name, strlen(name)); 132 memcpy(&extlist[cold_count + 1], buf, 133 F2FS_EXTENSION_LEN * hot_count); 134 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1); 135 } 136 return 0; 137 } 138 139 static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir, 140 struct inode *inode, const unsigned char *name) 141 { 142 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list; 143 unsigned char (*noext)[F2FS_EXTENSION_LEN] = 144 F2FS_OPTION(sbi).noextensions; 145 unsigned char (*ext)[F2FS_EXTENSION_LEN] = F2FS_OPTION(sbi).extensions; 146 unsigned char ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt; 147 unsigned char noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt; 148 int i, cold_count, hot_count; 149 150 if (!f2fs_sb_has_compression(sbi)) 151 return; 152 153 if (S_ISDIR(inode->i_mode)) 154 goto inherit_comp; 155 156 /* This name comes only from normal files. */ 157 if (!name) 158 return; 159 160 /* Don't compress hot files. */ 161 f2fs_down_read(&sbi->sb_lock); 162 cold_count = le32_to_cpu(sbi->raw_super->extension_count); 163 hot_count = sbi->raw_super->hot_ext_count; 164 for (i = cold_count; i < cold_count + hot_count; i++) 165 if (is_temperature_extension(name, extlist[i])) 166 break; 167 f2fs_up_read(&sbi->sb_lock); 168 if (i < (cold_count + hot_count)) 169 return; 170 171 /* Don't compress unallowed extension. */ 172 for (i = 0; i < noext_cnt; i++) 173 if (is_compress_extension(name, noext[i])) 174 return; 175 176 /* Compress wanting extension. */ 177 for (i = 0; i < ext_cnt; i++) { 178 if (is_compress_extension(name, ext[i])) { 179 set_compress_context(inode); 180 return; 181 } 182 } 183 inherit_comp: 184 /* Inherit the {no-}compression flag in directory */ 185 if (F2FS_I(dir)->i_flags & F2FS_NOCOMP_FL) { 186 F2FS_I(inode)->i_flags |= F2FS_NOCOMP_FL; 187 f2fs_mark_inode_dirty_sync(inode, true); 188 } else if (F2FS_I(dir)->i_flags & F2FS_COMPR_FL) { 189 set_compress_context(inode); 190 } 191 } 192 193 /* 194 * Set file's temperature for hot/cold data separation 195 */ 196 static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode, 197 const unsigned char *name) 198 { 199 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list; 200 int i, cold_count, hot_count; 201 202 f2fs_down_read(&sbi->sb_lock); 203 cold_count = le32_to_cpu(sbi->raw_super->extension_count); 204 hot_count = sbi->raw_super->hot_ext_count; 205 for (i = 0; i < cold_count + hot_count; i++) 206 if (is_temperature_extension(name, extlist[i])) 207 break; 208 f2fs_up_read(&sbi->sb_lock); 209 210 if (i == cold_count + hot_count) 211 return; 212 213 if (i < cold_count) 214 file_set_cold(inode); 215 else 216 file_set_hot(inode); 217 } 218 219 static struct inode *f2fs_new_inode(struct mnt_idmap *idmap, 220 struct inode *dir, umode_t mode, 221 const char *name) 222 { 223 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 224 struct f2fs_inode_info *fi; 225 nid_t ino; 226 struct inode *inode; 227 bool nid_free = false; 228 bool encrypt = false; 229 int xattr_size = 0; 230 int err; 231 232 inode = new_inode(dir->i_sb); 233 if (!inode) 234 return ERR_PTR(-ENOMEM); 235 236 if (!f2fs_alloc_nid(sbi, &ino)) { 237 err = -ENOSPC; 238 goto fail; 239 } 240 241 nid_free = true; 242 243 inode_init_owner(idmap, inode, dir, mode); 244 245 fi = F2FS_I(inode); 246 inode->i_ino = ino; 247 inode->i_blocks = 0; 248 simple_inode_init_ts(inode); 249 fi->i_crtime = inode_get_mtime(inode); 250 inode->i_generation = get_random_u32(); 251 252 if (S_ISDIR(inode->i_mode)) 253 fi->i_current_depth = 1; 254 255 err = insert_inode_locked(inode); 256 if (err) { 257 err = -EINVAL; 258 goto fail; 259 } 260 261 if (f2fs_sb_has_project_quota(sbi) && 262 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL)) 263 fi->i_projid = F2FS_I(dir)->i_projid; 264 else 265 fi->i_projid = make_kprojid(&init_user_ns, 266 F2FS_DEF_PROJID); 267 268 err = fscrypt_prepare_new_inode(dir, inode, &encrypt); 269 if (err) 270 goto fail_drop; 271 272 err = f2fs_dquot_initialize(inode); 273 if (err) 274 goto fail_drop; 275 276 set_inode_flag(inode, FI_NEW_INODE); 277 278 if (encrypt) 279 f2fs_set_encrypted_inode(inode); 280 281 if (f2fs_sb_has_extra_attr(sbi)) { 282 set_inode_flag(inode, FI_EXTRA_ATTR); 283 fi->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE; 284 } 285 286 if (test_opt(sbi, INLINE_XATTR)) 287 set_inode_flag(inode, FI_INLINE_XATTR); 288 289 if (f2fs_may_inline_dentry(inode)) 290 set_inode_flag(inode, FI_INLINE_DENTRY); 291 292 if (f2fs_sb_has_flexible_inline_xattr(sbi)) { 293 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode)); 294 if (f2fs_has_inline_xattr(inode)) 295 xattr_size = F2FS_OPTION(sbi).inline_xattr_size; 296 /* Otherwise, will be 0 */ 297 } else if (f2fs_has_inline_xattr(inode) || 298 f2fs_has_inline_dentry(inode)) { 299 xattr_size = DEFAULT_INLINE_XATTR_ADDRS; 300 } 301 fi->i_inline_xattr_size = xattr_size; 302 303 fi->i_flags = 304 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED); 305 306 if (S_ISDIR(inode->i_mode)) 307 fi->i_flags |= F2FS_INDEX_FL; 308 309 if (fi->i_flags & F2FS_PROJINHERIT_FL) 310 set_inode_flag(inode, FI_PROJ_INHERIT); 311 312 /* Check compression first. */ 313 set_compress_new_inode(sbi, dir, inode, name); 314 315 /* Should enable inline_data after compression set */ 316 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode)) 317 set_inode_flag(inode, FI_INLINE_DATA); 318 319 if (name && !test_opt(sbi, DISABLE_EXT_IDENTIFY)) 320 set_file_temperature(sbi, inode, name); 321 322 stat_inc_inline_xattr(inode); 323 stat_inc_inline_inode(inode); 324 stat_inc_inline_dir(inode); 325 326 f2fs_set_inode_flags(inode); 327 328 f2fs_init_extent_tree(inode); 329 330 trace_f2fs_new_inode(inode, 0); 331 return inode; 332 333 fail: 334 trace_f2fs_new_inode(inode, err); 335 make_bad_inode(inode); 336 if (nid_free) 337 set_inode_flag(inode, FI_FREE_NID); 338 iput(inode); 339 return ERR_PTR(err); 340 fail_drop: 341 trace_f2fs_new_inode(inode, err); 342 dquot_drop(inode); 343 inode->i_flags |= S_NOQUOTA; 344 make_bad_inode(inode); 345 if (nid_free) 346 set_inode_flag(inode, FI_FREE_NID); 347 clear_nlink(inode); 348 unlock_new_inode(inode); 349 iput(inode); 350 return ERR_PTR(err); 351 } 352 353 static int f2fs_create(struct mnt_idmap *idmap, struct inode *dir, 354 struct dentry *dentry, umode_t mode, bool excl) 355 { 356 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 357 struct inode *inode; 358 nid_t ino = 0; 359 int err; 360 361 if (unlikely(f2fs_cp_error(sbi))) 362 return -EIO; 363 if (!f2fs_is_checkpoint_ready(sbi)) 364 return -ENOSPC; 365 366 err = f2fs_dquot_initialize(dir); 367 if (err) 368 return err; 369 370 inode = f2fs_new_inode(idmap, dir, mode, dentry->d_name.name); 371 if (IS_ERR(inode)) 372 return PTR_ERR(inode); 373 374 inode->i_op = &f2fs_file_inode_operations; 375 inode->i_fop = &f2fs_file_operations; 376 inode->i_mapping->a_ops = &f2fs_dblock_aops; 377 ino = inode->i_ino; 378 379 f2fs_lock_op(sbi); 380 err = f2fs_add_link(dentry, inode); 381 if (err) 382 goto out; 383 f2fs_unlock_op(sbi); 384 385 f2fs_alloc_nid_done(sbi, ino); 386 387 d_instantiate_new(dentry, inode); 388 389 if (IS_DIRSYNC(dir)) 390 f2fs_sync_fs(sbi->sb, 1); 391 392 f2fs_balance_fs(sbi, true); 393 return 0; 394 out: 395 f2fs_handle_failed_inode(inode); 396 return err; 397 } 398 399 static int f2fs_link(struct dentry *old_dentry, struct inode *dir, 400 struct dentry *dentry) 401 { 402 struct inode *inode = d_inode(old_dentry); 403 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 404 int err; 405 406 if (unlikely(f2fs_cp_error(sbi))) 407 return -EIO; 408 if (!f2fs_is_checkpoint_ready(sbi)) 409 return -ENOSPC; 410 411 err = fscrypt_prepare_link(old_dentry, dir, dentry); 412 if (err) 413 return err; 414 415 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) && 416 (!projid_eq(F2FS_I(dir)->i_projid, 417 F2FS_I(old_dentry->d_inode)->i_projid))) 418 return -EXDEV; 419 420 err = f2fs_dquot_initialize(dir); 421 if (err) 422 return err; 423 424 f2fs_balance_fs(sbi, true); 425 426 inode_set_ctime_current(inode); 427 ihold(inode); 428 429 set_inode_flag(inode, FI_INC_LINK); 430 f2fs_lock_op(sbi); 431 err = f2fs_add_link(dentry, inode); 432 if (err) 433 goto out; 434 f2fs_unlock_op(sbi); 435 436 d_instantiate(dentry, inode); 437 438 if (IS_DIRSYNC(dir)) 439 f2fs_sync_fs(sbi->sb, 1); 440 return 0; 441 out: 442 clear_inode_flag(inode, FI_INC_LINK); 443 iput(inode); 444 f2fs_unlock_op(sbi); 445 return err; 446 } 447 448 struct dentry *f2fs_get_parent(struct dentry *child) 449 { 450 struct page *page; 451 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot_name, &page); 452 453 if (!ino) { 454 if (IS_ERR(page)) 455 return ERR_CAST(page); 456 return ERR_PTR(-ENOENT); 457 } 458 return d_obtain_alias(f2fs_iget(child->d_sb, ino)); 459 } 460 461 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, 462 unsigned int flags) 463 { 464 struct inode *inode = NULL; 465 struct f2fs_dir_entry *de; 466 struct page *page; 467 struct dentry *new; 468 nid_t ino = -1; 469 int err = 0; 470 struct f2fs_filename fname; 471 472 trace_f2fs_lookup_start(dir, dentry, flags); 473 474 if (dentry->d_name.len > F2FS_NAME_LEN) { 475 err = -ENAMETOOLONG; 476 goto out; 477 } 478 479 err = f2fs_prepare_lookup(dir, dentry, &fname); 480 if (err == -ENOENT) 481 goto out_splice; 482 if (err) 483 goto out; 484 de = __f2fs_find_entry(dir, &fname, &page); 485 f2fs_free_filename(&fname); 486 487 if (!de) { 488 if (IS_ERR(page)) { 489 err = PTR_ERR(page); 490 goto out; 491 } 492 err = -ENOENT; 493 goto out_splice; 494 } 495 496 ino = le32_to_cpu(de->ino); 497 f2fs_put_page(page, 0); 498 499 inode = f2fs_iget(dir->i_sb, ino); 500 if (IS_ERR(inode)) { 501 err = PTR_ERR(inode); 502 goto out; 503 } 504 505 if (IS_ENCRYPTED(dir) && 506 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && 507 !fscrypt_has_permitted_context(dir, inode)) { 508 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu", 509 dir->i_ino, inode->i_ino); 510 err = -EPERM; 511 goto out_iput; 512 } 513 out_splice: 514 if (IS_ENABLED(CONFIG_UNICODE) && !inode && IS_CASEFOLDED(dir)) { 515 /* Eventually we want to call d_add_ci(dentry, NULL) 516 * for negative dentries in the encoding case as 517 * well. For now, prevent the negative dentry 518 * from being cached. 519 */ 520 trace_f2fs_lookup_end(dir, dentry, ino, err); 521 return NULL; 522 } 523 524 new = d_splice_alias(inode, dentry); 525 trace_f2fs_lookup_end(dir, !IS_ERR_OR_NULL(new) ? new : dentry, 526 ino, IS_ERR(new) ? PTR_ERR(new) : err); 527 return new; 528 out_iput: 529 iput(inode); 530 out: 531 trace_f2fs_lookup_end(dir, dentry, ino, err); 532 return ERR_PTR(err); 533 } 534 535 static int f2fs_unlink(struct inode *dir, struct dentry *dentry) 536 { 537 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 538 struct inode *inode = d_inode(dentry); 539 struct f2fs_dir_entry *de; 540 struct page *page; 541 int err; 542 543 trace_f2fs_unlink_enter(dir, dentry); 544 545 if (unlikely(f2fs_cp_error(sbi))) { 546 err = -EIO; 547 goto fail; 548 } 549 550 err = f2fs_dquot_initialize(dir); 551 if (err) 552 goto fail; 553 err = f2fs_dquot_initialize(inode); 554 if (err) 555 goto fail; 556 557 de = f2fs_find_entry(dir, &dentry->d_name, &page); 558 if (!de) { 559 if (IS_ERR(page)) 560 err = PTR_ERR(page); 561 goto fail; 562 } 563 564 f2fs_balance_fs(sbi, true); 565 566 f2fs_lock_op(sbi); 567 err = f2fs_acquire_orphan_inode(sbi); 568 if (err) { 569 f2fs_unlock_op(sbi); 570 f2fs_put_page(page, 0); 571 goto fail; 572 } 573 f2fs_delete_entry(de, page, dir, inode); 574 f2fs_unlock_op(sbi); 575 576 /* VFS negative dentries are incompatible with Encoding and 577 * Case-insensitiveness. Eventually we'll want avoid 578 * invalidating the dentries here, alongside with returning the 579 * negative dentries at f2fs_lookup(), when it is better 580 * supported by the VFS for the CI case. 581 */ 582 if (IS_ENABLED(CONFIG_UNICODE) && IS_CASEFOLDED(dir)) 583 d_invalidate(dentry); 584 585 if (IS_DIRSYNC(dir)) 586 f2fs_sync_fs(sbi->sb, 1); 587 fail: 588 trace_f2fs_unlink_exit(inode, err); 589 return err; 590 } 591 592 static const char *f2fs_get_link(struct dentry *dentry, 593 struct inode *inode, 594 struct delayed_call *done) 595 { 596 const char *link = page_get_link(dentry, inode, done); 597 598 if (!IS_ERR(link) && !*link) { 599 /* this is broken symlink case */ 600 do_delayed_call(done); 601 clear_delayed_call(done); 602 link = ERR_PTR(-ENOENT); 603 } 604 return link; 605 } 606 607 static int f2fs_symlink(struct mnt_idmap *idmap, struct inode *dir, 608 struct dentry *dentry, const char *symname) 609 { 610 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 611 struct inode *inode; 612 size_t len = strlen(symname); 613 struct fscrypt_str disk_link; 614 int err; 615 616 if (unlikely(f2fs_cp_error(sbi))) 617 return -EIO; 618 if (!f2fs_is_checkpoint_ready(sbi)) 619 return -ENOSPC; 620 621 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize, 622 &disk_link); 623 if (err) 624 return err; 625 626 err = f2fs_dquot_initialize(dir); 627 if (err) 628 return err; 629 630 inode = f2fs_new_inode(idmap, dir, S_IFLNK | S_IRWXUGO, NULL); 631 if (IS_ERR(inode)) 632 return PTR_ERR(inode); 633 634 if (IS_ENCRYPTED(inode)) 635 inode->i_op = &f2fs_encrypted_symlink_inode_operations; 636 else 637 inode->i_op = &f2fs_symlink_inode_operations; 638 inode_nohighmem(inode); 639 inode->i_mapping->a_ops = &f2fs_dblock_aops; 640 641 f2fs_lock_op(sbi); 642 err = f2fs_add_link(dentry, inode); 643 if (err) 644 goto out_f2fs_handle_failed_inode; 645 f2fs_unlock_op(sbi); 646 f2fs_alloc_nid_done(sbi, inode->i_ino); 647 648 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); 649 if (err) 650 goto err_out; 651 652 err = page_symlink(inode, disk_link.name, disk_link.len); 653 654 err_out: 655 d_instantiate_new(dentry, inode); 656 657 /* 658 * Let's flush symlink data in order to avoid broken symlink as much as 659 * possible. Nevertheless, fsyncing is the best way, but there is no 660 * way to get a file descriptor in order to flush that. 661 * 662 * Note that, it needs to do dir->fsync to make this recoverable. 663 * If the symlink path is stored into inline_data, there is no 664 * performance regression. 665 */ 666 if (!err) { 667 filemap_write_and_wait_range(inode->i_mapping, 0, 668 disk_link.len - 1); 669 670 if (IS_DIRSYNC(dir)) 671 f2fs_sync_fs(sbi->sb, 1); 672 } else { 673 f2fs_unlink(dir, dentry); 674 } 675 676 f2fs_balance_fs(sbi, true); 677 goto out_free_encrypted_link; 678 679 out_f2fs_handle_failed_inode: 680 f2fs_handle_failed_inode(inode); 681 out_free_encrypted_link: 682 if (disk_link.name != (unsigned char *)symname) 683 kfree(disk_link.name); 684 return err; 685 } 686 687 static int f2fs_mkdir(struct mnt_idmap *idmap, struct inode *dir, 688 struct dentry *dentry, umode_t mode) 689 { 690 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 691 struct inode *inode; 692 int err; 693 694 if (unlikely(f2fs_cp_error(sbi))) 695 return -EIO; 696 697 err = f2fs_dquot_initialize(dir); 698 if (err) 699 return err; 700 701 inode = f2fs_new_inode(idmap, dir, S_IFDIR | mode, NULL); 702 if (IS_ERR(inode)) 703 return PTR_ERR(inode); 704 705 inode->i_op = &f2fs_dir_inode_operations; 706 inode->i_fop = &f2fs_dir_operations; 707 inode->i_mapping->a_ops = &f2fs_dblock_aops; 708 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 709 710 set_inode_flag(inode, FI_INC_LINK); 711 f2fs_lock_op(sbi); 712 err = f2fs_add_link(dentry, inode); 713 if (err) 714 goto out_fail; 715 f2fs_unlock_op(sbi); 716 717 f2fs_alloc_nid_done(sbi, inode->i_ino); 718 719 d_instantiate_new(dentry, inode); 720 721 if (IS_DIRSYNC(dir)) 722 f2fs_sync_fs(sbi->sb, 1); 723 724 f2fs_balance_fs(sbi, true); 725 return 0; 726 727 out_fail: 728 clear_inode_flag(inode, FI_INC_LINK); 729 f2fs_handle_failed_inode(inode); 730 return err; 731 } 732 733 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) 734 { 735 struct inode *inode = d_inode(dentry); 736 737 if (f2fs_empty_dir(inode)) 738 return f2fs_unlink(dir, dentry); 739 return -ENOTEMPTY; 740 } 741 742 static int f2fs_mknod(struct mnt_idmap *idmap, struct inode *dir, 743 struct dentry *dentry, umode_t mode, dev_t rdev) 744 { 745 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 746 struct inode *inode; 747 int err = 0; 748 749 if (unlikely(f2fs_cp_error(sbi))) 750 return -EIO; 751 if (!f2fs_is_checkpoint_ready(sbi)) 752 return -ENOSPC; 753 754 err = f2fs_dquot_initialize(dir); 755 if (err) 756 return err; 757 758 inode = f2fs_new_inode(idmap, dir, mode, NULL); 759 if (IS_ERR(inode)) 760 return PTR_ERR(inode); 761 762 init_special_inode(inode, inode->i_mode, rdev); 763 inode->i_op = &f2fs_special_inode_operations; 764 765 f2fs_lock_op(sbi); 766 err = f2fs_add_link(dentry, inode); 767 if (err) 768 goto out; 769 f2fs_unlock_op(sbi); 770 771 f2fs_alloc_nid_done(sbi, inode->i_ino); 772 773 d_instantiate_new(dentry, inode); 774 775 if (IS_DIRSYNC(dir)) 776 f2fs_sync_fs(sbi->sb, 1); 777 778 f2fs_balance_fs(sbi, true); 779 return 0; 780 out: 781 f2fs_handle_failed_inode(inode); 782 return err; 783 } 784 785 static int __f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir, 786 struct file *file, umode_t mode, bool is_whiteout, 787 struct inode **new_inode, struct f2fs_filename *fname) 788 { 789 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 790 struct inode *inode; 791 int err; 792 793 err = f2fs_dquot_initialize(dir); 794 if (err) 795 return err; 796 797 inode = f2fs_new_inode(idmap, dir, mode, NULL); 798 if (IS_ERR(inode)) 799 return PTR_ERR(inode); 800 801 if (is_whiteout) { 802 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); 803 inode->i_op = &f2fs_special_inode_operations; 804 } else { 805 inode->i_op = &f2fs_file_inode_operations; 806 inode->i_fop = &f2fs_file_operations; 807 inode->i_mapping->a_ops = &f2fs_dblock_aops; 808 } 809 810 f2fs_lock_op(sbi); 811 err = f2fs_acquire_orphan_inode(sbi); 812 if (err) 813 goto out; 814 815 err = f2fs_do_tmpfile(inode, dir, fname); 816 if (err) 817 goto release_out; 818 819 /* 820 * add this non-linked tmpfile to orphan list, in this way we could 821 * remove all unused data of tmpfile after abnormal power-off. 822 */ 823 f2fs_add_orphan_inode(inode); 824 f2fs_alloc_nid_done(sbi, inode->i_ino); 825 826 if (is_whiteout) { 827 f2fs_i_links_write(inode, false); 828 829 spin_lock(&inode->i_lock); 830 inode->i_state |= I_LINKABLE; 831 spin_unlock(&inode->i_lock); 832 } else { 833 if (file) 834 d_tmpfile(file, inode); 835 else 836 f2fs_i_links_write(inode, false); 837 } 838 /* link_count was changed by d_tmpfile as well. */ 839 f2fs_unlock_op(sbi); 840 unlock_new_inode(inode); 841 842 if (new_inode) 843 *new_inode = inode; 844 845 f2fs_balance_fs(sbi, true); 846 return 0; 847 848 release_out: 849 f2fs_release_orphan_inode(sbi); 850 out: 851 f2fs_handle_failed_inode(inode); 852 return err; 853 } 854 855 static int f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir, 856 struct file *file, umode_t mode) 857 { 858 struct f2fs_sb_info *sbi = F2FS_I_SB(dir); 859 int err; 860 861 if (unlikely(f2fs_cp_error(sbi))) 862 return -EIO; 863 if (!f2fs_is_checkpoint_ready(sbi)) 864 return -ENOSPC; 865 866 err = __f2fs_tmpfile(idmap, dir, file, mode, false, NULL, NULL); 867 868 return finish_open_simple(file, err); 869 } 870 871 static int f2fs_create_whiteout(struct mnt_idmap *idmap, 872 struct inode *dir, struct inode **whiteout, 873 struct f2fs_filename *fname) 874 { 875 return __f2fs_tmpfile(idmap, dir, NULL, S_IFCHR | WHITEOUT_MODE, 876 true, whiteout, fname); 877 } 878 879 int f2fs_get_tmpfile(struct mnt_idmap *idmap, struct inode *dir, 880 struct inode **new_inode) 881 { 882 return __f2fs_tmpfile(idmap, dir, NULL, S_IFREG, 883 false, new_inode, NULL); 884 } 885 886 static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir, 887 struct dentry *old_dentry, struct inode *new_dir, 888 struct dentry *new_dentry, unsigned int flags) 889 { 890 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); 891 struct inode *old_inode = d_inode(old_dentry); 892 struct inode *new_inode = d_inode(new_dentry); 893 struct inode *whiteout = NULL; 894 struct page *old_dir_page = NULL; 895 struct page *old_page, *new_page = NULL; 896 struct f2fs_dir_entry *old_dir_entry = NULL; 897 struct f2fs_dir_entry *old_entry; 898 struct f2fs_dir_entry *new_entry; 899 bool old_is_dir = S_ISDIR(old_inode->i_mode); 900 int err; 901 902 if (unlikely(f2fs_cp_error(sbi))) 903 return -EIO; 904 if (!f2fs_is_checkpoint_ready(sbi)) 905 return -ENOSPC; 906 907 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && 908 (!projid_eq(F2FS_I(new_dir)->i_projid, 909 F2FS_I(old_dentry->d_inode)->i_projid))) 910 return -EXDEV; 911 912 /* 913 * If new_inode is null, the below renaming flow will 914 * add a link in old_dir which can convert inline_dir. 915 * After then, if we failed to get the entry due to other 916 * reasons like ENOMEM, we had to remove the new entry. 917 * Instead of adding such the error handling routine, let's 918 * simply convert first here. 919 */ 920 if (old_dir == new_dir && !new_inode) { 921 err = f2fs_try_convert_inline_dir(old_dir, new_dentry); 922 if (err) 923 return err; 924 } 925 926 if (flags & RENAME_WHITEOUT) { 927 struct f2fs_filename fname; 928 929 err = f2fs_setup_filename(old_dir, &old_dentry->d_name, 930 0, &fname); 931 if (err) 932 return err; 933 934 err = f2fs_create_whiteout(idmap, old_dir, &whiteout, &fname); 935 if (err) 936 return err; 937 } 938 939 err = f2fs_dquot_initialize(old_dir); 940 if (err) 941 goto out; 942 943 err = f2fs_dquot_initialize(new_dir); 944 if (err) 945 goto out; 946 947 if (new_inode) { 948 err = f2fs_dquot_initialize(new_inode); 949 if (err) 950 goto out; 951 } 952 953 err = -ENOENT; 954 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); 955 if (!old_entry) { 956 if (IS_ERR(old_page)) 957 err = PTR_ERR(old_page); 958 goto out; 959 } 960 961 if (old_is_dir && old_dir != new_dir) { 962 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); 963 if (!old_dir_entry) { 964 if (IS_ERR(old_dir_page)) 965 err = PTR_ERR(old_dir_page); 966 goto out_old; 967 } 968 } 969 970 if (new_inode) { 971 972 err = -ENOTEMPTY; 973 if (old_is_dir && !f2fs_empty_dir(new_inode)) 974 goto out_dir; 975 976 err = -ENOENT; 977 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, 978 &new_page); 979 if (!new_entry) { 980 if (IS_ERR(new_page)) 981 err = PTR_ERR(new_page); 982 goto out_dir; 983 } 984 985 f2fs_balance_fs(sbi, true); 986 987 f2fs_lock_op(sbi); 988 989 err = f2fs_acquire_orphan_inode(sbi); 990 if (err) 991 goto put_out_dir; 992 993 f2fs_set_link(new_dir, new_entry, new_page, old_inode); 994 new_page = NULL; 995 996 inode_set_ctime_current(new_inode); 997 f2fs_down_write(&F2FS_I(new_inode)->i_sem); 998 if (old_is_dir) 999 f2fs_i_links_write(new_inode, false); 1000 f2fs_i_links_write(new_inode, false); 1001 f2fs_up_write(&F2FS_I(new_inode)->i_sem); 1002 1003 if (!new_inode->i_nlink) 1004 f2fs_add_orphan_inode(new_inode); 1005 else 1006 f2fs_release_orphan_inode(sbi); 1007 } else { 1008 f2fs_balance_fs(sbi, true); 1009 1010 f2fs_lock_op(sbi); 1011 1012 err = f2fs_add_link(new_dentry, old_inode); 1013 if (err) { 1014 f2fs_unlock_op(sbi); 1015 goto out_dir; 1016 } 1017 1018 if (old_is_dir) 1019 f2fs_i_links_write(new_dir, true); 1020 } 1021 1022 f2fs_down_write(&F2FS_I(old_inode)->i_sem); 1023 if (!old_is_dir || whiteout) 1024 file_lost_pino(old_inode); 1025 else 1026 /* adjust dir's i_pino to pass fsck check */ 1027 f2fs_i_pino_write(old_inode, new_dir->i_ino); 1028 f2fs_up_write(&F2FS_I(old_inode)->i_sem); 1029 1030 inode_set_ctime_current(old_inode); 1031 f2fs_mark_inode_dirty_sync(old_inode, false); 1032 1033 f2fs_delete_entry(old_entry, old_page, old_dir, NULL); 1034 old_page = NULL; 1035 1036 if (whiteout) { 1037 set_inode_flag(whiteout, FI_INC_LINK); 1038 err = f2fs_add_link(old_dentry, whiteout); 1039 if (err) 1040 goto put_out_dir; 1041 1042 spin_lock(&whiteout->i_lock); 1043 whiteout->i_state &= ~I_LINKABLE; 1044 spin_unlock(&whiteout->i_lock); 1045 1046 iput(whiteout); 1047 } 1048 1049 if (old_dir_entry) 1050 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); 1051 if (old_is_dir) 1052 f2fs_i_links_write(old_dir, false); 1053 1054 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) { 1055 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO); 1056 if (S_ISDIR(old_inode->i_mode)) 1057 f2fs_add_ino_entry(sbi, old_inode->i_ino, 1058 TRANS_DIR_INO); 1059 } 1060 1061 f2fs_unlock_op(sbi); 1062 1063 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) 1064 f2fs_sync_fs(sbi->sb, 1); 1065 1066 f2fs_update_time(sbi, REQ_TIME); 1067 return 0; 1068 1069 put_out_dir: 1070 f2fs_unlock_op(sbi); 1071 f2fs_put_page(new_page, 0); 1072 out_dir: 1073 if (old_dir_entry) 1074 f2fs_put_page(old_dir_page, 0); 1075 out_old: 1076 f2fs_put_page(old_page, 0); 1077 out: 1078 iput(whiteout); 1079 return err; 1080 } 1081 1082 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry, 1083 struct inode *new_dir, struct dentry *new_dentry) 1084 { 1085 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); 1086 struct inode *old_inode = d_inode(old_dentry); 1087 struct inode *new_inode = d_inode(new_dentry); 1088 struct page *old_dir_page, *new_dir_page; 1089 struct page *old_page, *new_page; 1090 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL; 1091 struct f2fs_dir_entry *old_entry, *new_entry; 1092 int old_nlink = 0, new_nlink = 0; 1093 int err; 1094 1095 if (unlikely(f2fs_cp_error(sbi))) 1096 return -EIO; 1097 if (!f2fs_is_checkpoint_ready(sbi)) 1098 return -ENOSPC; 1099 1100 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && 1101 !projid_eq(F2FS_I(new_dir)->i_projid, 1102 F2FS_I(old_dentry->d_inode)->i_projid)) || 1103 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && 1104 !projid_eq(F2FS_I(old_dir)->i_projid, 1105 F2FS_I(new_dentry->d_inode)->i_projid))) 1106 return -EXDEV; 1107 1108 err = f2fs_dquot_initialize(old_dir); 1109 if (err) 1110 goto out; 1111 1112 err = f2fs_dquot_initialize(new_dir); 1113 if (err) 1114 goto out; 1115 1116 err = -ENOENT; 1117 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); 1118 if (!old_entry) { 1119 if (IS_ERR(old_page)) 1120 err = PTR_ERR(old_page); 1121 goto out; 1122 } 1123 1124 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page); 1125 if (!new_entry) { 1126 if (IS_ERR(new_page)) 1127 err = PTR_ERR(new_page); 1128 goto out_old; 1129 } 1130 1131 /* prepare for updating ".." directory entry info later */ 1132 if (old_dir != new_dir) { 1133 if (S_ISDIR(old_inode->i_mode)) { 1134 old_dir_entry = f2fs_parent_dir(old_inode, 1135 &old_dir_page); 1136 if (!old_dir_entry) { 1137 if (IS_ERR(old_dir_page)) 1138 err = PTR_ERR(old_dir_page); 1139 goto out_new; 1140 } 1141 } 1142 1143 if (S_ISDIR(new_inode->i_mode)) { 1144 new_dir_entry = f2fs_parent_dir(new_inode, 1145 &new_dir_page); 1146 if (!new_dir_entry) { 1147 if (IS_ERR(new_dir_page)) 1148 err = PTR_ERR(new_dir_page); 1149 goto out_old_dir; 1150 } 1151 } 1152 } 1153 1154 /* 1155 * If cross rename between file and directory those are not 1156 * in the same directory, we will inc nlink of file's parent 1157 * later, so we should check upper boundary of its nlink. 1158 */ 1159 if ((!old_dir_entry || !new_dir_entry) && 1160 old_dir_entry != new_dir_entry) { 1161 old_nlink = old_dir_entry ? -1 : 1; 1162 new_nlink = -old_nlink; 1163 err = -EMLINK; 1164 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) || 1165 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX)) 1166 goto out_new_dir; 1167 } 1168 1169 f2fs_balance_fs(sbi, true); 1170 1171 f2fs_lock_op(sbi); 1172 1173 /* update ".." directory entry info of old dentry */ 1174 if (old_dir_entry) 1175 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); 1176 1177 /* update ".." directory entry info of new dentry */ 1178 if (new_dir_entry) 1179 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir); 1180 1181 /* update directory entry info of old dir inode */ 1182 f2fs_set_link(old_dir, old_entry, old_page, new_inode); 1183 1184 f2fs_down_write(&F2FS_I(old_inode)->i_sem); 1185 if (!old_dir_entry) 1186 file_lost_pino(old_inode); 1187 else 1188 /* adjust dir's i_pino to pass fsck check */ 1189 f2fs_i_pino_write(old_inode, new_dir->i_ino); 1190 f2fs_up_write(&F2FS_I(old_inode)->i_sem); 1191 1192 inode_set_ctime_current(old_dir); 1193 if (old_nlink) { 1194 f2fs_down_write(&F2FS_I(old_dir)->i_sem); 1195 f2fs_i_links_write(old_dir, old_nlink > 0); 1196 f2fs_up_write(&F2FS_I(old_dir)->i_sem); 1197 } 1198 f2fs_mark_inode_dirty_sync(old_dir, false); 1199 1200 /* update directory entry info of new dir inode */ 1201 f2fs_set_link(new_dir, new_entry, new_page, old_inode); 1202 1203 f2fs_down_write(&F2FS_I(new_inode)->i_sem); 1204 if (!new_dir_entry) 1205 file_lost_pino(new_inode); 1206 else 1207 /* adjust dir's i_pino to pass fsck check */ 1208 f2fs_i_pino_write(new_inode, old_dir->i_ino); 1209 f2fs_up_write(&F2FS_I(new_inode)->i_sem); 1210 1211 inode_set_ctime_current(new_dir); 1212 if (new_nlink) { 1213 f2fs_down_write(&F2FS_I(new_dir)->i_sem); 1214 f2fs_i_links_write(new_dir, new_nlink > 0); 1215 f2fs_up_write(&F2FS_I(new_dir)->i_sem); 1216 } 1217 f2fs_mark_inode_dirty_sync(new_dir, false); 1218 1219 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) { 1220 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO); 1221 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO); 1222 } 1223 1224 f2fs_unlock_op(sbi); 1225 1226 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) 1227 f2fs_sync_fs(sbi->sb, 1); 1228 1229 f2fs_update_time(sbi, REQ_TIME); 1230 return 0; 1231 out_new_dir: 1232 if (new_dir_entry) { 1233 f2fs_put_page(new_dir_page, 0); 1234 } 1235 out_old_dir: 1236 if (old_dir_entry) { 1237 f2fs_put_page(old_dir_page, 0); 1238 } 1239 out_new: 1240 f2fs_put_page(new_page, 0); 1241 out_old: 1242 f2fs_put_page(old_page, 0); 1243 out: 1244 return err; 1245 } 1246 1247 static int f2fs_rename2(struct mnt_idmap *idmap, 1248 struct inode *old_dir, struct dentry *old_dentry, 1249 struct inode *new_dir, struct dentry *new_dentry, 1250 unsigned int flags) 1251 { 1252 int err; 1253 1254 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) 1255 return -EINVAL; 1256 1257 trace_f2fs_rename_start(old_dir, old_dentry, new_dir, new_dentry, 1258 flags); 1259 1260 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, 1261 flags); 1262 if (err) 1263 return err; 1264 1265 if (flags & RENAME_EXCHANGE) 1266 err = f2fs_cross_rename(old_dir, old_dentry, 1267 new_dir, new_dentry); 1268 else 1269 /* 1270 * VFS has already handled the new dentry existence case, 1271 * here, we just deal with "RENAME_NOREPLACE" as regular rename. 1272 */ 1273 err = f2fs_rename(idmap, old_dir, old_dentry, 1274 new_dir, new_dentry, flags); 1275 1276 trace_f2fs_rename_end(old_dentry, new_dentry, flags, err); 1277 return err; 1278 } 1279 1280 static const char *f2fs_encrypted_get_link(struct dentry *dentry, 1281 struct inode *inode, 1282 struct delayed_call *done) 1283 { 1284 struct page *page; 1285 const char *target; 1286 1287 if (!dentry) 1288 return ERR_PTR(-ECHILD); 1289 1290 page = read_mapping_page(inode->i_mapping, 0, NULL); 1291 if (IS_ERR(page)) 1292 return ERR_CAST(page); 1293 1294 target = fscrypt_get_symlink(inode, page_address(page), 1295 inode->i_sb->s_blocksize, done); 1296 put_page(page); 1297 return target; 1298 } 1299 1300 static int f2fs_encrypted_symlink_getattr(struct mnt_idmap *idmap, 1301 const struct path *path, 1302 struct kstat *stat, u32 request_mask, 1303 unsigned int query_flags) 1304 { 1305 f2fs_getattr(idmap, path, stat, request_mask, query_flags); 1306 1307 return fscrypt_symlink_getattr(path, stat); 1308 } 1309 1310 const struct inode_operations f2fs_encrypted_symlink_inode_operations = { 1311 .get_link = f2fs_encrypted_get_link, 1312 .getattr = f2fs_encrypted_symlink_getattr, 1313 .setattr = f2fs_setattr, 1314 .listxattr = f2fs_listxattr, 1315 }; 1316 1317 const struct inode_operations f2fs_dir_inode_operations = { 1318 .create = f2fs_create, 1319 .lookup = f2fs_lookup, 1320 .link = f2fs_link, 1321 .unlink = f2fs_unlink, 1322 .symlink = f2fs_symlink, 1323 .mkdir = f2fs_mkdir, 1324 .rmdir = f2fs_rmdir, 1325 .mknod = f2fs_mknod, 1326 .rename = f2fs_rename2, 1327 .tmpfile = f2fs_tmpfile, 1328 .getattr = f2fs_getattr, 1329 .setattr = f2fs_setattr, 1330 .get_inode_acl = f2fs_get_acl, 1331 .set_acl = f2fs_set_acl, 1332 .listxattr = f2fs_listxattr, 1333 .fiemap = f2fs_fiemap, 1334 .fileattr_get = f2fs_fileattr_get, 1335 .fileattr_set = f2fs_fileattr_set, 1336 }; 1337 1338 const struct inode_operations f2fs_symlink_inode_operations = { 1339 .get_link = f2fs_get_link, 1340 .getattr = f2fs_getattr, 1341 .setattr = f2fs_setattr, 1342 .listxattr = f2fs_listxattr, 1343 }; 1344 1345 const struct inode_operations f2fs_special_inode_operations = { 1346 .getattr = f2fs_getattr, 1347 .setattr = f2fs_setattr, 1348 .get_inode_acl = f2fs_get_acl, 1349 .set_acl = f2fs_set_acl, 1350 .listxattr = f2fs_listxattr, 1351 }; 1352