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         if (sbi->last_valid_block_count + sbi->alloc_valid_block_count
  53                         > sbi->user_block_count)
  54                 return false;
  55         return true;
  56 }
  57
  58 static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
  59                                                                 nid_t ino)
  60 {
  61         struct fsync_inode_entry *entry;
  62
  63         list_for_each_entry(entry, head, list)
  64                 if (entry->inode->i_ino == ino)
  65                         return entry;
  66
  67         return NULL;
  68 }
  69
  70 static int recover_dentry(struct inode *inode, struct page *ipage)
  71 {
  72         struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
  73         nid_t pino = le32_to_cpu(raw_inode->i_pino);
  74         struct f2fs_dir_entry *de;
  75         struct qstr name;
  76         struct page *page;
  77         struct inode *dir, *einode;
  78         int err = 0;
  79
  80         dir = f2fs_iget(inode->i_sb, pino);
  81         if (IS_ERR(dir)) {
  82                 err = PTR_ERR(dir);
  83                 goto out;
  84         }
  85
  86         if (file_enc_name(inode)) {
  87                 iput(dir);
  88                 return 0;
  89         }
  90
  91         name.len = le32_to_cpu(raw_inode->i_namelen);
  92         name.name = raw_inode->i_name;
  93
  94         if (unlikely(name.len > F2FS_NAME_LEN)) {
  95                 WARN_ON(1);
  96                 err = -ENAMETOOLONG;
  97                 goto out_err;
  98         }
  99 retry:
 100         de = f2fs_find_entry(dir, &name, &page);
 101         if (de && inode->i_ino == le32_to_cpu(de->ino))
 102                 goto out_unmap_put;
 103
 104         if (de) {
 105                 einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
 106                 if (IS_ERR(einode)) {
 107                         WARN_ON(1);
 108                         err = PTR_ERR(einode);
 109                         if (err == -ENOENT)
 110                                 err = -EEXIST;
 111                         goto out_unmap_put;
 112                 }
 113                 err = acquire_orphan_inode(F2FS_I_SB(inode));
 114                 if (err) {
 115                         iput(einode);
 116                         goto out_unmap_put;
 117                 }
 118                 f2fs_delete_entry(de, page, dir, einode);
 119                 iput(einode);
 120                 goto retry;
 121         }
 122         err = __f2fs_add_link(dir, &name, inode, inode->i_ino, inode->i_mode);
 123         if (err)
 124                 goto out_err;
 125
 126         if (is_inode_flag_set(F2FS_I(dir), FI_DELAY_IPUT)) {
 127                 iput(dir);
 128         } else {
 129                 add_dirty_dir_inode(dir);
 130                 set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
 131         }
 132
 133         goto out;
 134
 135 out_unmap_put:
 136         f2fs_dentry_kunmap(dir, page);
 137         f2fs_put_page(page, 0);
 138 out_err:
 139         iput(dir);
 140 out:
 141         f2fs_msg(inode->i_sb, KERN_NOTICE,
 142                         "%s: ino = %x, name = %s, dir = %lx, err = %d",
 143                         __func__, ino_of_node(ipage), raw_inode->i_name,
 144                         IS_ERR(dir) ? 0 : dir->i_ino, err);
 145         return err;
 146 }
 147
 148 static void recover_inode(struct inode *inode, struct page *page)
 149 {
 150         struct f2fs_inode *raw = F2FS_INODE(page);
 151         char *name;
 152
 153         inode->i_mode = le16_to_cpu(raw->i_mode);
 154         i_size_write(inode, le64_to_cpu(raw->i_size));
 155         inode->i_atime.tv_sec = le64_to_cpu(raw->i_mtime);
 156         inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
 157         inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
 158         inode->i_atime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
 159         inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
 160         inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
 161
 162         if (file_enc_name(inode))
 163                 name = "<encrypted>";
 164         else
 165                 name = F2FS_INODE(page)->i_name;
 166
 167         f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
 168                         ino_of_node(page), name);
 169 }
 170
 171 static bool is_same_inode(struct inode *inode, struct page *ipage)
 172 {
 173         struct f2fs_inode *ri = F2FS_INODE(ipage);
 174         struct timespec disk;
 175
 176         if (!IS_INODE(ipage))
 177                 return true;
 178
 179         disk.tv_sec = le64_to_cpu(ri->i_ctime);
 180         disk.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
 181         if (timespec_compare(&inode->i_ctime, &disk) > 0)
 182                 return false;
 183
 184         disk.tv_sec = le64_to_cpu(ri->i_atime);
 185         disk.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
 186         if (timespec_compare(&inode->i_atime, &disk) > 0)
 187                 return false;
 188
 189         disk.tv_sec = le64_to_cpu(ri->i_mtime);
 190         disk.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
 191         if (timespec_compare(&inode->i_mtime, &disk) > 0)
 192                 return false;
 193
 194         return true;
 195 }
 196
 197 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
 198 {
 199         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 200         struct curseg_info *curseg;
 201         struct page *page = NULL;
 202         block_t blkaddr;
 203         int err = 0;
 204
 205         /* get node pages in the current segment */
 206         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 207         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 208
 209         ra_meta_pages(sbi, blkaddr, 1, META_POR, true);
 210
 211         while (1) {
 212                 struct fsync_inode_entry *entry;
 213
 214                 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
 215                         return 0;
 216
 217                 page = get_tmp_page(sbi, blkaddr);
 218
 219                 if (cp_ver != cpver_of_node(page))
 220                         break;
 221
 222                 if (!is_fsync_dnode(page))
 223                         goto next;
 224
 225                 entry = get_fsync_inode(head, ino_of_node(page));
 226                 if (entry) {
 227                         if (!is_same_inode(entry->inode, page))
 228                                 goto next;
 229                 } else {
 230                         if (IS_INODE(page) && is_dent_dnode(page)) {
 231                                 err = recover_inode_page(sbi, page);
 232                                 if (err)
 233                                         break;
 234                         }
 235
 236                         /* add this fsync inode to the list */
 237                         entry = kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
 238                         if (!entry) {
 239                                 err = -ENOMEM;
 240                                 break;
 241                         }
 242                         /*
 243                          * CP | dnode(F) | inode(DF)
 244                          * For this case, we should not give up now.
 245                          */
 246                         entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
 247                         if (IS_ERR(entry->inode)) {
 248                                 err = PTR_ERR(entry->inode);
 249                                 kmem_cache_free(fsync_entry_slab, entry);
 250                                 if (err == -ENOENT) {
 251                                         err = 0;
 252                                         goto next;
 253                                 }
 254                                 break;
 255                         }
 256                         list_add_tail(&entry->list, head);
 257                 }
 258                 entry->blkaddr = blkaddr;
 259
 260                 if (IS_INODE(page)) {
 261                         entry->last_inode = blkaddr;
 262                         if (is_dent_dnode(page))
 263                                 entry->last_dentry = blkaddr;
 264                 }
 265 next:
 266                 /* check next segment */
 267                 blkaddr = next_blkaddr_of_node(page);
 268                 f2fs_put_page(page, 1);
 269
 270                 ra_meta_pages_cond(sbi, blkaddr);
 271         }
 272         f2fs_put_page(page, 1);
 273         return err;
 274 }
 275
 276 static void destroy_fsync_dnodes(struct list_head *head)
 277 {
 278         struct fsync_inode_entry *entry, *tmp;
 279
 280         list_for_each_entry_safe(entry, tmp, head, list) {
 281                 iput(entry->inode);
 282                 list_del(&entry->list);
 283                 kmem_cache_free(fsync_entry_slab, entry);
 284         }
 285 }
 286
 287 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 288                         block_t blkaddr, struct dnode_of_data *dn)
 289 {
 290         struct seg_entry *sentry;
 291         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 292         unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 293         struct f2fs_summary_block *sum_node;
 294         struct f2fs_summary sum;
 295         struct page *sum_page, *node_page;
 296         struct dnode_of_data tdn = *dn;
 297         nid_t ino, nid;
 298         struct inode *inode;
 299         unsigned int offset;
 300         block_t bidx;
 301         int i;
 302
 303         sentry = get_seg_entry(sbi, segno);
 304         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 305                 return 0;
 306
 307         /* Get the previous summary */
 308         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
 309                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 310                 if (curseg->segno == segno) {
 311                         sum = curseg->sum_blk->entries[blkoff];
 312                         goto got_it;
 313                 }
 314         }
 315
 316         sum_page = get_sum_page(sbi, segno);
 317         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
 318         sum = sum_node->entries[blkoff];
 319         f2fs_put_page(sum_page, 1);
 320 got_it:
 321         /* Use the locked dnode page and inode */
 322         nid = le32_to_cpu(sum.nid);
 323         if (dn->inode->i_ino == nid) {
 324                 tdn.nid = nid;
 325                 if (!dn->inode_page_locked)
 326                         lock_page(dn->inode_page);
 327                 tdn.node_page = dn->inode_page;
 328                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 329                 goto truncate_out;
 330         } else if (dn->nid == nid) {
 331                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 332                 goto truncate_out;
 333         }
 334
 335         /* Get the node page */
 336         node_page = get_node_page(sbi, nid);
 337         if (IS_ERR(node_page))
 338                 return PTR_ERR(node_page);
 339
 340         offset = ofs_of_node(node_page);
 341         ino = ino_of_node(node_page);
 342         f2fs_put_page(node_page, 1);
 343
 344         if (ino != dn->inode->i_ino) {
 345                 /* Deallocate previous index in the node page */
 346                 inode = f2fs_iget(sbi->sb, ino);
 347                 if (IS_ERR(inode))
 348                         return PTR_ERR(inode);
 349         } else {
 350                 inode = dn->inode;
 351         }
 352
 353         bidx = start_bidx_of_node(offset, inode) + le16_to_cpu(sum.ofs_in_node);
 354
 355         /*
 356          * if inode page is locked, unlock temporarily, but its reference
 357          * count keeps alive.
 358          */
 359         if (ino == dn->inode->i_ino && dn->inode_page_locked)
 360                 unlock_page(dn->inode_page);
 361
 362         set_new_dnode(&tdn, inode, NULL, NULL, 0);
 363         if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
 364                 goto out;
 365
 366         if (tdn.data_blkaddr == blkaddr)
 367                 truncate_data_blocks_range(&tdn, 1);
 368
 369         f2fs_put_dnode(&tdn);
 370 out:
 371         if (ino != dn->inode->i_ino)
 372                 iput(inode);
 373         else if (dn->inode_page_locked)
 374                 lock_page(dn->inode_page);
 375         return 0;
 376
 377 truncate_out:
 378         if (datablock_addr(tdn.node_page, tdn.ofs_in_node) == blkaddr)
 379                 truncate_data_blocks_range(&tdn, 1);
 380         if (dn->inode->i_ino == nid && !dn->inode_page_locked)
 381                 unlock_page(dn->inode_page);
 382         return 0;
 383 }
 384
 385 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 386                                         struct page *page, block_t blkaddr)
 387 {
 388         struct dnode_of_data dn;
 389         struct node_info ni;
 390         unsigned int start, end;
 391         int err = 0, recovered = 0;
 392
 393         /* step 1: recover xattr */
 394         if (IS_INODE(page)) {
 395                 recover_inline_xattr(inode, page);
 396         } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
 397                 /*
 398                  * Deprecated; xattr blocks should be found from cold log.
 399                  * But, we should remain this for backward compatibility.
 400                  */
 401                 recover_xattr_data(inode, page, blkaddr);
 402                 goto out;
 403         }
 404
 405         /* step 2: recover inline data */
 406         if (recover_inline_data(inode, page))
 407                 goto out;
 408
 409         /* step 3: recover data indices */
 410         start = start_bidx_of_node(ofs_of_node(page), inode);
 411         end = start + ADDRS_PER_PAGE(page, inode);
 412
 413         set_new_dnode(&dn, inode, NULL, NULL, 0);
 414
 415         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
 416         if (err)
 417                 goto out;
 418
 419         f2fs_wait_on_page_writeback(dn.node_page, NODE, true);
 420
 421         get_node_info(sbi, dn.nid, &ni);
 422         f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
 423         f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
 424
 425         for (; start < end; start++, dn.ofs_in_node++) {
 426                 block_t src, dest;
 427
 428                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
 429                 dest = datablock_addr(page, dn.ofs_in_node);
 430
 431                 /* skip recovering if dest is the same as src */
 432                 if (src == dest)
 433                         continue;
 434
 435                 /* dest is invalid, just invalidate src block */
 436                 if (dest == NULL_ADDR) {
 437                         truncate_data_blocks_range(&dn, 1);
 438                         continue;
 439                 }
 440
 441                 /*
 442                  * dest is reserved block, invalidate src block
 443                  * and then reserve one new block in dnode page.
 444                  */
 445                 if (dest == NEW_ADDR) {
 446                         truncate_data_blocks_range(&dn, 1);
 447                         err = reserve_new_block(&dn);
 448                         f2fs_bug_on(sbi, err);
 449                         continue;
 450                 }
 451
 452                 /* dest is valid block, try to recover from src to dest */
 453                 if (is_valid_blkaddr(sbi, dest, META_POR)) {
 454
 455                         if (src == NULL_ADDR) {
 456                                 err = reserve_new_block(&dn);
 457                                 /* We should not get -ENOSPC */
 458                                 f2fs_bug_on(sbi, err);
 459                         }
 460
 461                         /* Check the previous node page having this index */
 462                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 463                         if (err)
 464                                 goto err;
 465
 466                         /* write dummy data page */
 467                         f2fs_replace_block(sbi, &dn, src, dest,
 468                                                 ni.version, false, false);
 469                         recovered++;
 470                 }
 471         }
 472
 473         if (IS_INODE(dn.node_page))
 474                 sync_inode_page(&dn);
 475
 476         copy_node_footer(dn.node_page, page);
 477         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 478                                         ofs_of_node(page), false);
 479         set_page_dirty(dn.node_page);
 480 err:
 481         f2fs_put_dnode(&dn);
 482 out:
 483         f2fs_msg(sbi->sb, KERN_NOTICE,
 484                 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
 485                 inode->i_ino, recovered, err);
 486         return err;
 487 }
 488
 489 static int recover_data(struct f2fs_sb_info *sbi, struct list_head *head)
 490 {
 491         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 492         struct curseg_info *curseg;
 493         struct page *page = NULL;
 494         int err = 0;
 495         block_t blkaddr;
 496
 497         /* get node pages in the current segment */
 498         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 499         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 500
 501         while (1) {
 502                 struct fsync_inode_entry *entry;
 503
 504                 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
 505                         break;
 506
 507                 ra_meta_pages_cond(sbi, blkaddr);
 508
 509                 page = get_tmp_page(sbi, blkaddr);
 510
 511                 if (cp_ver != cpver_of_node(page)) {
 512                         f2fs_put_page(page, 1);
 513                         break;
 514                 }
 515
 516                 entry = get_fsync_inode(head, ino_of_node(page));
 517                 if (!entry)
 518                         goto next;
 519                 /*
 520                  * inode(x) | CP | inode(x) | dnode(F)
 521                  * In this case, we can lose the latest inode(x).
 522                  * So, call recover_inode for the inode update.
 523                  */
 524                 if (entry->last_inode == blkaddr)
 525                         recover_inode(entry->inode, page);
 526                 if (entry->last_dentry == blkaddr) {
 527                         err = recover_dentry(entry->inode, page);
 528                         if (err) {
 529                                 f2fs_put_page(page, 1);
 530                                 break;
 531                         }
 532                 }
 533                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
 534                 if (err) {
 535                         f2fs_put_page(page, 1);
 536                         break;
 537                 }
 538
 539                 if (entry->blkaddr == blkaddr) {
 540                         iput(entry->inode);
 541                         list_del(&entry->list);
 542                         kmem_cache_free(fsync_entry_slab, entry);
 543                 }
 544 next:
 545                 /* check next segment */
 546                 blkaddr = next_blkaddr_of_node(page);
 547                 f2fs_put_page(page, 1);
 548         }
 549         if (!err)
 550                 allocate_new_segments(sbi);
 551         return err;
 552 }
 553
 554 int recover_fsync_data(struct f2fs_sb_info *sbi)
 555 {
 556         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 557         struct list_head inode_list;
 558         block_t blkaddr;
 559         int err;
 560         bool need_writecp = false;
 561
 562         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 563                         sizeof(struct fsync_inode_entry));
 564         if (!fsync_entry_slab)
 565                 return -ENOMEM;
 566
 567         INIT_LIST_HEAD(&inode_list);
 568
 569         /* prevent checkpoint */
 570         mutex_lock(&sbi->cp_mutex);
 571
 572         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 573
 574         /* step #1: find fsynced inode numbers */
 575         err = find_fsync_dnodes(sbi, &inode_list);
 576         if (err)
 577                 goto out;
 578
 579         if (list_empty(&inode_list))
 580                 goto out;
 581
 582         need_writecp = true;
 583
 584         /* step #2: recover data */
 585         err = recover_data(sbi, &inode_list);
 586         if (!err)
 587                 f2fs_bug_on(sbi, !list_empty(&inode_list));
 588 out:
 589         destroy_fsync_dnodes(&inode_list);
 590         kmem_cache_destroy(fsync_entry_slab);
 591
 592         /* truncate meta pages to be used by the recovery */
 593         truncate_inode_pages_range(META_MAPPING(sbi),
 594                         (loff_t)MAIN_BLKADDR(sbi) << PAGE_SHIFT, -1);
 595
 596         if (err) {
 597                 truncate_inode_pages_final(NODE_MAPPING(sbi));
 598                 truncate_inode_pages_final(META_MAPPING(sbi));
 599         }
 600
 601         clear_sbi_flag(sbi, SBI_POR_DOING);
 602         if (err) {
 603                 bool invalidate = false;
 604
 605                 if (discard_next_dnode(sbi, blkaddr))
 606                         invalidate = true;
 607
 608                 /* Flush all the NAT/SIT pages */
 609                 while (get_pages(sbi, F2FS_DIRTY_META))
 610                         sync_meta_pages(sbi, META, LONG_MAX);
 611
 612                 /* invalidate temporary meta page */
 613                 if (invalidate)
 614                         invalidate_mapping_pages(META_MAPPING(sbi),
 615                                                         blkaddr, blkaddr);
 616
 617                 set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
 618                 mutex_unlock(&sbi->cp_mutex);
 619         } else if (need_writecp) {
 620                 struct cp_control cpc = {
 621                         .reason = CP_RECOVERY,
 622                 };
 623                 mutex_unlock(&sbi->cp_mutex);
 624                 err = write_checkpoint(sbi, &cpc);
 625         } else {
 626                 mutex_unlock(&sbi->cp_mutex);
 627         }
 628         return err;
 629 }