fs/f2fs/recovery.c

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