1 /* 2 * fs/f2fs/recovery.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 "f2fs.h" 14 #include "node.h" 15 #include "segment.h" 16 17 /* 18 * Roll forward recovery scenarios. 19 * 20 * [Term] F: fsync_mark, D: dentry_mark 21 * 22 * 1. inode(x) | CP | inode(x) | dnode(F) 23 * -> Update the latest inode(x). 24 * 25 * 2. inode(x) | CP | inode(F) | dnode(F) 26 * -> No problem. 27 * 28 * 3. inode(x) | CP | dnode(F) | inode(x) 29 * -> Recover to the latest dnode(F), and drop the last inode(x) 30 * 31 * 4. inode(x) | CP | dnode(F) | inode(F) 32 * -> No problem. 33 * 34 * 5. CP | inode(x) | dnode(F) 35 * -> The inode(DF) was missing. Should drop this dnode(F). 36 * 37 * 6. CP | inode(DF) | dnode(F) 38 * -> No problem. 39 * 40 * 7. CP | dnode(F) | inode(DF) 41 * -> If f2fs_iget fails, then goto next to find inode(DF). 42 * 43 * 8. CP | dnode(F) | inode(x) 44 * -> If f2fs_iget fails, then goto next to find inode(DF). 45 * But it will fail due to no inode(DF). 46 */ 47 48 static struct kmem_cache *fsync_entry_slab; 49 50 bool space_for_roll_forward(struct f2fs_sb_info *sbi) 51 { 52 s64 nalloc = percpu_counter_sum_positive(&sbi->alloc_valid_block_count); 53 54 if (sbi->last_valid_block_count + nalloc > sbi->user_block_count) 55 return false; 56 return true; 57 } 58 59 static struct fsync_inode_entry *get_fsync_inode(struct list_head *head, 60 nid_t ino) 61 { 62 struct fsync_inode_entry *entry; 63 64 list_for_each_entry(entry, head, list) 65 if (entry->inode->i_ino == ino) 66 return entry; 67 68 return NULL; 69 } 70 71 static struct fsync_inode_entry *add_fsync_inode(struct f2fs_sb_info *sbi, 72 struct list_head *head, nid_t ino, bool quota_inode) 73 { 74 struct inode *inode; 75 struct fsync_inode_entry *entry; 76 int err; 77 78 inode = f2fs_iget_retry(sbi->sb, ino); 79 if (IS_ERR(inode)) 80 return ERR_CAST(inode); 81 82 err = dquot_initialize(inode); 83 if (err) 84 goto err_out; 85 86 if (quota_inode) { 87 err = dquot_alloc_inode(inode); 88 if (err) 89 goto err_out; 90 } 91 92 entry = f2fs_kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO); 93 entry->inode = inode; 94 list_add_tail(&entry->list, head); 95 96 return entry; 97 err_out: 98 iput(inode); 99 return ERR_PTR(err); 100 } 101 102 static void del_fsync_inode(struct fsync_inode_entry *entry) 103 { 104 iput(entry->inode); 105 list_del(&entry->list); 106 kmem_cache_free(fsync_entry_slab, entry); 107 } 108 109 static int recover_dentry(struct inode *inode, struct page *ipage, 110 struct list_head *dir_list) 111 { 112 struct f2fs_inode *raw_inode = F2FS_INODE(ipage); 113 nid_t pino = le32_to_cpu(raw_inode->i_pino); 114 struct f2fs_dir_entry *de; 115 struct fscrypt_name fname; 116 struct page *page; 117 struct inode *dir, *einode; 118 struct fsync_inode_entry *entry; 119 int err = 0; 120 char *name; 121 122 entry = get_fsync_inode(dir_list, pino); 123 if (!entry) { 124 entry = add_fsync_inode(F2FS_I_SB(inode), dir_list, 125 pino, false); 126 if (IS_ERR(entry)) { 127 dir = ERR_CAST(entry); 128 err = PTR_ERR(entry); 129 goto out; 130 } 131 } 132 133 dir = entry->inode; 134 135 memset(&fname, 0, sizeof(struct fscrypt_name)); 136 fname.disk_name.len = le32_to_cpu(raw_inode->i_namelen); 137 fname.disk_name.name = raw_inode->i_name; 138 139 if (unlikely(fname.disk_name.len > F2FS_NAME_LEN)) { 140 WARN_ON(1); 141 err = -ENAMETOOLONG; 142 goto out; 143 } 144 retry: 145 de = __f2fs_find_entry(dir, &fname, &page); 146 if (de && inode->i_ino == le32_to_cpu(de->ino)) 147 goto out_unmap_put; 148 149 if (de) { 150 einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino)); 151 if (IS_ERR(einode)) { 152 WARN_ON(1); 153 err = PTR_ERR(einode); 154 if (err == -ENOENT) 155 err = -EEXIST; 156 goto out_unmap_put; 157 } 158 159 err = dquot_initialize(einode); 160 if (err) { 161 iput(einode); 162 goto out_unmap_put; 163 } 164 165 err = acquire_orphan_inode(F2FS_I_SB(inode)); 166 if (err) { 167 iput(einode); 168 goto out_unmap_put; 169 } 170 f2fs_delete_entry(de, page, dir, einode); 171 iput(einode); 172 goto retry; 173 } else if (IS_ERR(page)) { 174 err = PTR_ERR(page); 175 } else { 176 err = __f2fs_do_add_link(dir, &fname, inode, 177 inode->i_ino, inode->i_mode); 178 } 179 if (err == -ENOMEM) 180 goto retry; 181 goto out; 182 183 out_unmap_put: 184 f2fs_dentry_kunmap(dir, page); 185 f2fs_put_page(page, 0); 186 out: 187 if (file_enc_name(inode)) 188 name = "<encrypted>"; 189 else 190 name = raw_inode->i_name; 191 f2fs_msg(inode->i_sb, KERN_NOTICE, 192 "%s: ino = %x, name = %s, dir = %lx, err = %d", 193 __func__, ino_of_node(ipage), name, 194 IS_ERR(dir) ? 0 : dir->i_ino, err); 195 return err; 196 } 197 198 static void recover_inode(struct inode *inode, struct page *page) 199 { 200 struct f2fs_inode *raw = F2FS_INODE(page); 201 char *name; 202 203 inode->i_mode = le16_to_cpu(raw->i_mode); 204 f2fs_i_size_write(inode, le64_to_cpu(raw->i_size)); 205 inode->i_atime.tv_sec = le64_to_cpu(raw->i_atime); 206 inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime); 207 inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime); 208 inode->i_atime.tv_nsec = le32_to_cpu(raw->i_atime_nsec); 209 inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec); 210 inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec); 211 212 F2FS_I(inode)->i_advise = raw->i_advise; 213 214 if (file_enc_name(inode)) 215 name = "<encrypted>"; 216 else 217 name = F2FS_INODE(page)->i_name; 218 219 f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s", 220 ino_of_node(page), name); 221 } 222 223 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head, 224 bool check_only) 225 { 226 struct curseg_info *curseg; 227 struct page *page = NULL; 228 block_t blkaddr; 229 int err = 0; 230 231 /* get node pages in the current segment */ 232 curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); 233 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); 234 235 while (1) { 236 struct fsync_inode_entry *entry; 237 238 if (!is_valid_blkaddr(sbi, blkaddr, META_POR)) 239 return 0; 240 241 page = get_tmp_page(sbi, blkaddr); 242 243 if (!is_recoverable_dnode(page)) 244 break; 245 246 if (!is_fsync_dnode(page)) 247 goto next; 248 249 entry = get_fsync_inode(head, ino_of_node(page)); 250 if (!entry) { 251 bool quota_inode = false; 252 253 if (!check_only && 254 IS_INODE(page) && is_dent_dnode(page)) { 255 err = recover_inode_page(sbi, page); 256 if (err) 257 break; 258 quota_inode = true; 259 } 260 261 /* 262 * CP | dnode(F) | inode(DF) 263 * For this case, we should not give up now. 264 */ 265 entry = add_fsync_inode(sbi, head, ino_of_node(page), 266 quota_inode); 267 if (IS_ERR(entry)) { 268 err = PTR_ERR(entry); 269 if (err == -ENOENT) { 270 err = 0; 271 goto next; 272 } 273 break; 274 } 275 } 276 entry->blkaddr = blkaddr; 277 278 if (IS_INODE(page) && is_dent_dnode(page)) 279 entry->last_dentry = blkaddr; 280 next: 281 /* check next segment */ 282 blkaddr = next_blkaddr_of_node(page); 283 f2fs_put_page(page, 1); 284 285 ra_meta_pages_cond(sbi, blkaddr); 286 } 287 f2fs_put_page(page, 1); 288 return err; 289 } 290 291 static void destroy_fsync_dnodes(struct list_head *head) 292 { 293 struct fsync_inode_entry *entry, *tmp; 294 295 list_for_each_entry_safe(entry, tmp, head, list) 296 del_fsync_inode(entry); 297 } 298 299 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi, 300 block_t blkaddr, struct dnode_of_data *dn) 301 { 302 struct seg_entry *sentry; 303 unsigned int segno = GET_SEGNO(sbi, blkaddr); 304 unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr); 305 struct f2fs_summary_block *sum_node; 306 struct f2fs_summary sum; 307 struct page *sum_page, *node_page; 308 struct dnode_of_data tdn = *dn; 309 nid_t ino, nid; 310 struct inode *inode; 311 unsigned int offset; 312 block_t bidx; 313 int i; 314 315 sentry = get_seg_entry(sbi, segno); 316 if (!f2fs_test_bit(blkoff, sentry->cur_valid_map)) 317 return 0; 318 319 /* Get the previous summary */ 320 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) { 321 struct curseg_info *curseg = CURSEG_I(sbi, i); 322 if (curseg->segno == segno) { 323 sum = curseg->sum_blk->entries[blkoff]; 324 goto got_it; 325 } 326 } 327 328 sum_page = get_sum_page(sbi, segno); 329 sum_node = (struct f2fs_summary_block *)page_address(sum_page); 330 sum = sum_node->entries[blkoff]; 331 f2fs_put_page(sum_page, 1); 332 got_it: 333 /* Use the locked dnode page and inode */ 334 nid = le32_to_cpu(sum.nid); 335 if (dn->inode->i_ino == nid) { 336 tdn.nid = nid; 337 if (!dn->inode_page_locked) 338 lock_page(dn->inode_page); 339 tdn.node_page = dn->inode_page; 340 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node); 341 goto truncate_out; 342 } else if (dn->nid == nid) { 343 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node); 344 goto truncate_out; 345 } 346 347 /* Get the node page */ 348 node_page = get_node_page(sbi, nid); 349 if (IS_ERR(node_page)) 350 return PTR_ERR(node_page); 351 352 offset = ofs_of_node(node_page); 353 ino = ino_of_node(node_page); 354 f2fs_put_page(node_page, 1); 355 356 if (ino != dn->inode->i_ino) { 357 int ret; 358 359 /* Deallocate previous index in the node page */ 360 inode = f2fs_iget_retry(sbi->sb, ino); 361 if (IS_ERR(inode)) 362 return PTR_ERR(inode); 363 364 ret = dquot_initialize(inode); 365 if (ret) { 366 iput(inode); 367 return ret; 368 } 369 } else { 370 inode = dn->inode; 371 } 372 373 bidx = start_bidx_of_node(offset, inode) + le16_to_cpu(sum.ofs_in_node); 374 375 /* 376 * if inode page is locked, unlock temporarily, but its reference 377 * count keeps alive. 378 */ 379 if (ino == dn->inode->i_ino && dn->inode_page_locked) 380 unlock_page(dn->inode_page); 381 382 set_new_dnode(&tdn, inode, NULL, NULL, 0); 383 if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE)) 384 goto out; 385 386 if (tdn.data_blkaddr == blkaddr) 387 truncate_data_blocks_range(&tdn, 1); 388 389 f2fs_put_dnode(&tdn); 390 out: 391 if (ino != dn->inode->i_ino) 392 iput(inode); 393 else if (dn->inode_page_locked) 394 lock_page(dn->inode_page); 395 return 0; 396 397 truncate_out: 398 if (datablock_addr(tdn.inode, tdn.node_page, 399 tdn.ofs_in_node) == blkaddr) 400 truncate_data_blocks_range(&tdn, 1); 401 if (dn->inode->i_ino == nid && !dn->inode_page_locked) 402 unlock_page(dn->inode_page); 403 return 0; 404 } 405 406 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode, 407 struct page *page, block_t blkaddr) 408 { 409 struct dnode_of_data dn; 410 struct node_info ni; 411 unsigned int start, end; 412 int err = 0, recovered = 0; 413 414 /* step 1: recover xattr */ 415 if (IS_INODE(page)) { 416 recover_inline_xattr(inode, page); 417 } else if (f2fs_has_xattr_block(ofs_of_node(page))) { 418 err = recover_xattr_data(inode, page, blkaddr); 419 if (!err) 420 recovered++; 421 goto out; 422 } 423 424 /* step 2: recover inline data */ 425 if (recover_inline_data(inode, page)) 426 goto out; 427 428 /* step 3: recover data indices */ 429 start = start_bidx_of_node(ofs_of_node(page), inode); 430 end = start + ADDRS_PER_PAGE(page, inode); 431 432 set_new_dnode(&dn, inode, NULL, NULL, 0); 433 retry_dn: 434 err = get_dnode_of_data(&dn, start, ALLOC_NODE); 435 if (err) { 436 if (err == -ENOMEM) { 437 congestion_wait(BLK_RW_ASYNC, HZ/50); 438 goto retry_dn; 439 } 440 goto out; 441 } 442 443 f2fs_wait_on_page_writeback(dn.node_page, NODE, true); 444 445 get_node_info(sbi, dn.nid, &ni); 446 f2fs_bug_on(sbi, ni.ino != ino_of_node(page)); 447 f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page)); 448 449 for (; start < end; start++, dn.ofs_in_node++) { 450 block_t src, dest; 451 452 src = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node); 453 dest = datablock_addr(dn.inode, page, dn.ofs_in_node); 454 455 /* skip recovering if dest is the same as src */ 456 if (src == dest) 457 continue; 458 459 /* dest is invalid, just invalidate src block */ 460 if (dest == NULL_ADDR) { 461 truncate_data_blocks_range(&dn, 1); 462 continue; 463 } 464 465 if (!file_keep_isize(inode) && 466 (i_size_read(inode) <= ((loff_t)start << PAGE_SHIFT))) 467 f2fs_i_size_write(inode, 468 (loff_t)(start + 1) << PAGE_SHIFT); 469 470 /* 471 * dest is reserved block, invalidate src block 472 * and then reserve one new block in dnode page. 473 */ 474 if (dest == NEW_ADDR) { 475 truncate_data_blocks_range(&dn, 1); 476 reserve_new_block(&dn); 477 continue; 478 } 479 480 /* dest is valid block, try to recover from src to dest */ 481 if (is_valid_blkaddr(sbi, dest, META_POR)) { 482 483 if (src == NULL_ADDR) { 484 err = reserve_new_block(&dn); 485 #ifdef CONFIG_F2FS_FAULT_INJECTION 486 while (err) 487 err = reserve_new_block(&dn); 488 #endif 489 /* We should not get -ENOSPC */ 490 f2fs_bug_on(sbi, err); 491 if (err) 492 goto err; 493 } 494 retry_prev: 495 /* Check the previous node page having this index */ 496 err = check_index_in_prev_nodes(sbi, dest, &dn); 497 if (err) { 498 if (err == -ENOMEM) { 499 congestion_wait(BLK_RW_ASYNC, HZ/50); 500 goto retry_prev; 501 } 502 goto err; 503 } 504 505 /* write dummy data page */ 506 f2fs_replace_block(sbi, &dn, src, dest, 507 ni.version, false, false); 508 recovered++; 509 } 510 } 511 512 copy_node_footer(dn.node_page, page); 513 fill_node_footer(dn.node_page, dn.nid, ni.ino, 514 ofs_of_node(page), false); 515 set_page_dirty(dn.node_page); 516 err: 517 f2fs_put_dnode(&dn); 518 out: 519 f2fs_msg(sbi->sb, KERN_NOTICE, 520 "recover_data: ino = %lx (i_size: %s) recovered = %d, err = %d", 521 inode->i_ino, 522 file_keep_isize(inode) ? "keep" : "recover", 523 recovered, err); 524 return err; 525 } 526 527 static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list, 528 struct list_head *dir_list) 529 { 530 struct curseg_info *curseg; 531 struct page *page = NULL; 532 int err = 0; 533 block_t blkaddr; 534 535 /* get node pages in the current segment */ 536 curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); 537 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); 538 539 while (1) { 540 struct fsync_inode_entry *entry; 541 542 if (!is_valid_blkaddr(sbi, blkaddr, META_POR)) 543 break; 544 545 ra_meta_pages_cond(sbi, blkaddr); 546 547 page = get_tmp_page(sbi, blkaddr); 548 549 if (!is_recoverable_dnode(page)) { 550 f2fs_put_page(page, 1); 551 break; 552 } 553 554 entry = get_fsync_inode(inode_list, ino_of_node(page)); 555 if (!entry) 556 goto next; 557 /* 558 * inode(x) | CP | inode(x) | dnode(F) 559 * In this case, we can lose the latest inode(x). 560 * So, call recover_inode for the inode update. 561 */ 562 if (IS_INODE(page)) 563 recover_inode(entry->inode, page); 564 if (entry->last_dentry == blkaddr) { 565 err = recover_dentry(entry->inode, page, dir_list); 566 if (err) { 567 f2fs_put_page(page, 1); 568 break; 569 } 570 } 571 err = do_recover_data(sbi, entry->inode, page, blkaddr); 572 if (err) { 573 f2fs_put_page(page, 1); 574 break; 575 } 576 577 if (entry->blkaddr == blkaddr) 578 del_fsync_inode(entry); 579 next: 580 /* check next segment */ 581 blkaddr = next_blkaddr_of_node(page); 582 f2fs_put_page(page, 1); 583 } 584 if (!err) 585 allocate_new_segments(sbi); 586 return err; 587 } 588 589 int recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only) 590 { 591 struct list_head inode_list; 592 struct list_head dir_list; 593 int err; 594 int ret = 0; 595 unsigned long s_flags = sbi->sb->s_flags; 596 bool need_writecp = false; 597 #ifdef CONFIG_QUOTA 598 int quota_enabled; 599 #endif 600 601 if (s_flags & MS_RDONLY) { 602 f2fs_msg(sbi->sb, KERN_INFO, "orphan cleanup on readonly fs"); 603 sbi->sb->s_flags &= ~MS_RDONLY; 604 } 605 606 #ifdef CONFIG_QUOTA 607 /* Needed for iput() to work correctly and not trash data */ 608 sbi->sb->s_flags |= MS_ACTIVE; 609 /* Turn on quotas so that they are updated correctly */ 610 quota_enabled = f2fs_enable_quota_files(sbi, s_flags & MS_RDONLY); 611 #endif 612 613 fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry", 614 sizeof(struct fsync_inode_entry)); 615 if (!fsync_entry_slab) { 616 err = -ENOMEM; 617 goto out; 618 } 619 620 INIT_LIST_HEAD(&inode_list); 621 INIT_LIST_HEAD(&dir_list); 622 623 /* prevent checkpoint */ 624 mutex_lock(&sbi->cp_mutex); 625 626 /* step #1: find fsynced inode numbers */ 627 err = find_fsync_dnodes(sbi, &inode_list, check_only); 628 if (err || list_empty(&inode_list)) 629 goto skip; 630 631 if (check_only) { 632 ret = 1; 633 goto skip; 634 } 635 636 need_writecp = true; 637 638 /* step #2: recover data */ 639 err = recover_data(sbi, &inode_list, &dir_list); 640 if (!err) 641 f2fs_bug_on(sbi, !list_empty(&inode_list)); 642 skip: 643 destroy_fsync_dnodes(&inode_list); 644 645 /* truncate meta pages to be used by the recovery */ 646 truncate_inode_pages_range(META_MAPPING(sbi), 647 (loff_t)MAIN_BLKADDR(sbi) << PAGE_SHIFT, -1); 648 649 if (err) { 650 truncate_inode_pages_final(NODE_MAPPING(sbi)); 651 truncate_inode_pages_final(META_MAPPING(sbi)); 652 } 653 654 clear_sbi_flag(sbi, SBI_POR_DOING); 655 mutex_unlock(&sbi->cp_mutex); 656 657 /* let's drop all the directory inodes for clean checkpoint */ 658 destroy_fsync_dnodes(&dir_list); 659 660 if (!err && need_writecp) { 661 struct cp_control cpc = { 662 .reason = CP_RECOVERY, 663 }; 664 err = write_checkpoint(sbi, &cpc); 665 } 666 667 kmem_cache_destroy(fsync_entry_slab); 668 out: 669 #ifdef CONFIG_QUOTA 670 /* Turn quotas off */ 671 if (quota_enabled) 672 f2fs_quota_off_umount(sbi->sb); 673 #endif 674 sbi->sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 675 676 return ret ? ret: err; 677 } 678