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                                 bool check_only)
 203 {
 204         struct curseg_info *curseg;
 205         struct page *page = NULL;
 206         block_t blkaddr;
 207         int err = 0;
 208
 209         /* get node pages in the current segment */
 210         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 211         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 212
 213         while (1) {
 214                 struct fsync_inode_entry *entry;
 215
 216                 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
 217                         return 0;
 218
 219                 page = get_tmp_page(sbi, blkaddr);
 220
 221                 if (!is_recoverable_dnode(page))
 222                         break;
 223
 224                 if (!is_fsync_dnode(page))
 225                         goto next;
 226
 227                 entry = get_fsync_inode(head, ino_of_node(page));
 228                 if (!entry) {
 229                         if (!check_only &&
 230                                         IS_INODE(page) && is_dent_dnode(page)) {
 231                                 err = recover_inode_page(sbi, page);
 232                                 if (err)
 233                                         break;
 234                         }
 235
 236                         /*
 237                          * CP | dnode(F) | inode(DF)
 238                          * For this case, we should not give up now.
 239                          */
 240                         entry = add_fsync_inode(sbi, head, ino_of_node(page));
 241                         if (IS_ERR(entry)) {
 242                                 err = PTR_ERR(entry);
 243                                 if (err == -ENOENT) {
 244                                         err = 0;
 245                                         goto next;
 246                                 }
 247                                 break;
 248                         }
 249                 }
 250                 entry->blkaddr = blkaddr;
 251
 252                 if (IS_INODE(page) && is_dent_dnode(page))
 253                         entry->last_dentry = blkaddr;
 254 next:
 255                 /* check next segment */
 256                 blkaddr = next_blkaddr_of_node(page);
 257                 f2fs_put_page(page, 1);
 258
 259                 ra_meta_pages_cond(sbi, blkaddr);
 260         }
 261         f2fs_put_page(page, 1);
 262         return err;
 263 }
 264
 265 static void destroy_fsync_dnodes(struct list_head *head)
 266 {
 267         struct fsync_inode_entry *entry, *tmp;
 268
 269         list_for_each_entry_safe(entry, tmp, head, list)
 270                 del_fsync_inode(entry);
 271 }
 272
 273 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 274                         block_t blkaddr, struct dnode_of_data *dn)
 275 {
 276         struct seg_entry *sentry;
 277         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 278         unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 279         struct f2fs_summary_block *sum_node;
 280         struct f2fs_summary sum;
 281         struct page *sum_page, *node_page;
 282         struct dnode_of_data tdn = *dn;
 283         nid_t ino, nid;
 284         struct inode *inode;
 285         unsigned int offset;
 286         block_t bidx;
 287         int i;
 288
 289         sentry = get_seg_entry(sbi, segno);
 290         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 291                 return 0;
 292
 293         /* Get the previous summary */
 294         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
 295                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 296                 if (curseg->segno == segno) {
 297                         sum = curseg->sum_blk->entries[blkoff];
 298                         goto got_it;
 299                 }
 300         }
 301
 302         sum_page = get_sum_page(sbi, segno);
 303         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
 304         sum = sum_node->entries[blkoff];
 305         f2fs_put_page(sum_page, 1);
 306 got_it:
 307         /* Use the locked dnode page and inode */
 308         nid = le32_to_cpu(sum.nid);
 309         if (dn->inode->i_ino == nid) {
 310                 tdn.nid = nid;
 311                 if (!dn->inode_page_locked)
 312                         lock_page(dn->inode_page);
 313                 tdn.node_page = dn->inode_page;
 314                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 315                 goto truncate_out;
 316         } else if (dn->nid == nid) {
 317                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 318                 goto truncate_out;
 319         }
 320
 321         /* Get the node page */
 322         node_page = get_node_page(sbi, nid);
 323         if (IS_ERR(node_page))
 324                 return PTR_ERR(node_page);
 325
 326         offset = ofs_of_node(node_page);
 327         ino = ino_of_node(node_page);
 328         f2fs_put_page(node_page, 1);
 329
 330         if (ino != dn->inode->i_ino) {
 331                 /* Deallocate previous index in the node page */
 332                 inode = f2fs_iget_retry(sbi->sb, ino);
 333                 if (IS_ERR(inode))
 334                         return PTR_ERR(inode);
 335         } else {
 336                 inode = dn->inode;
 337         }
 338
 339         bidx = start_bidx_of_node(offset, inode) + le16_to_cpu(sum.ofs_in_node);
 340
 341         /*
 342          * if inode page is locked, unlock temporarily, but its reference
 343          * count keeps alive.
 344          */
 345         if (ino == dn->inode->i_ino && dn->inode_page_locked)
 346                 unlock_page(dn->inode_page);
 347
 348         set_new_dnode(&tdn, inode, NULL, NULL, 0);
 349         if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
 350                 goto out;
 351
 352         if (tdn.data_blkaddr == blkaddr)
 353                 truncate_data_blocks_range(&tdn, 1);
 354
 355         f2fs_put_dnode(&tdn);
 356 out:
 357         if (ino != dn->inode->i_ino)
 358                 iput(inode);
 359         else if (dn->inode_page_locked)
 360                 lock_page(dn->inode_page);
 361         return 0;
 362
 363 truncate_out:
 364         if (datablock_addr(tdn.node_page, tdn.ofs_in_node) == blkaddr)
 365                 truncate_data_blocks_range(&tdn, 1);
 366         if (dn->inode->i_ino == nid && !dn->inode_page_locked)
 367                 unlock_page(dn->inode_page);
 368         return 0;
 369 }
 370
 371 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 372                                         struct page *page, block_t blkaddr)
 373 {
 374         struct dnode_of_data dn;
 375         struct node_info ni;
 376         unsigned int start, end;
 377         int err = 0, recovered = 0;
 378
 379         /* step 1: recover xattr */
 380         if (IS_INODE(page)) {
 381                 recover_inline_xattr(inode, page);
 382         } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
 383                 err = recover_xattr_data(inode, page, blkaddr);
 384                 if (!err)
 385                         recovered++;
 386                 goto out;
 387         }
 388
 389         /* step 2: recover inline data */
 390         if (recover_inline_data(inode, page))
 391                 goto out;
 392
 393         /* step 3: recover data indices */
 394         start = start_bidx_of_node(ofs_of_node(page), inode);
 395         end = start + ADDRS_PER_PAGE(page, inode);
 396
 397         set_new_dnode(&dn, inode, NULL, NULL, 0);
 398 retry_dn:
 399         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
 400         if (err) {
 401                 if (err == -ENOMEM) {
 402                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 403                         goto retry_dn;
 404                 }
 405                 goto out;
 406         }
 407
 408         f2fs_wait_on_page_writeback(dn.node_page, NODE, true);
 409
 410         get_node_info(sbi, dn.nid, &ni);
 411         f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
 412         f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
 413
 414         for (; start < end; start++, dn.ofs_in_node++) {
 415                 block_t src, dest;
 416
 417                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
 418                 dest = datablock_addr(page, dn.ofs_in_node);
 419
 420                 /* skip recovering if dest is the same as src */
 421                 if (src == dest)
 422                         continue;
 423
 424                 /* dest is invalid, just invalidate src block */
 425                 if (dest == NULL_ADDR) {
 426                         truncate_data_blocks_range(&dn, 1);
 427                         continue;
 428                 }
 429
 430                 if (!file_keep_isize(inode) &&
 431                         (i_size_read(inode) <= ((loff_t)start << PAGE_SHIFT)))
 432                         f2fs_i_size_write(inode,
 433                                 (loff_t)(start + 1) << PAGE_SHIFT);
 434
 435                 /*
 436                  * dest is reserved block, invalidate src block
 437                  * and then reserve one new block in dnode page.
 438                  */
 439                 if (dest == NEW_ADDR) {
 440                         truncate_data_blocks_range(&dn, 1);
 441                         reserve_new_block(&dn);
 442                         continue;
 443                 }
 444
 445                 /* dest is valid block, try to recover from src to dest */
 446                 if (is_valid_blkaddr(sbi, dest, META_POR)) {
 447
 448                         if (src == NULL_ADDR) {
 449                                 err = reserve_new_block(&dn);
 450 #ifdef CONFIG_F2FS_FAULT_INJECTION
 451                                 while (err)
 452                                         err = reserve_new_block(&dn);
 453 #endif
 454                                 /* We should not get -ENOSPC */
 455                                 f2fs_bug_on(sbi, err);
 456                                 if (err)
 457                                         goto err;
 458                         }
 459 retry_prev:
 460                         /* Check the previous node page having this index */
 461                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 462                         if (err) {
 463                                 if (err == -ENOMEM) {
 464                                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 465                                         goto retry_prev;
 466                                 }
 467                                 goto err;
 468                         }
 469
 470                         /* write dummy data page */
 471                         f2fs_replace_block(sbi, &dn, src, dest,
 472                                                 ni.version, false, false);
 473                         recovered++;
 474                 }
 475         }
 476
 477         copy_node_footer(dn.node_page, page);
 478         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 479                                         ofs_of_node(page), false);
 480         set_page_dirty(dn.node_page);
 481 err:
 482         f2fs_put_dnode(&dn);
 483 out:
 484         f2fs_msg(sbi->sb, KERN_NOTICE,
 485                 "recover_data: ino = %lx (i_size: %s) recovered = %d, err = %d",
 486                 inode->i_ino,
 487                 file_keep_isize(inode) ? "keep" : "recover",
 488                 recovered, err);
 489         return err;
 490 }
 491
 492 static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
 493                                                 struct list_head *dir_list)
 494 {
 495         struct curseg_info *curseg;
 496         struct page *page = NULL;
 497         int err = 0;
 498         block_t blkaddr;
 499
 500         /* get node pages in the current segment */
 501         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 502         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 503
 504         while (1) {
 505                 struct fsync_inode_entry *entry;
 506
 507                 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
 508                         break;
 509
 510                 ra_meta_pages_cond(sbi, blkaddr);
 511
 512                 page = get_tmp_page(sbi, blkaddr);
 513
 514                 if (!is_recoverable_dnode(page)) {
 515                         f2fs_put_page(page, 1);
 516                         break;
 517                 }
 518
 519                 entry = get_fsync_inode(inode_list, ino_of_node(page));
 520                 if (!entry)
 521                         goto next;
 522                 /*
 523                  * inode(x) | CP | inode(x) | dnode(F)
 524                  * In this case, we can lose the latest inode(x).
 525                  * So, call recover_inode for the inode update.
 526                  */
 527                 if (IS_INODE(page))
 528                         recover_inode(entry->inode, page);
 529                 if (entry->last_dentry == blkaddr) {
 530                         err = recover_dentry(entry->inode, page, dir_list);
 531                         if (err) {
 532                                 f2fs_put_page(page, 1);
 533                                 break;
 534                         }
 535                 }
 536                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
 537                 if (err) {
 538                         f2fs_put_page(page, 1);
 539                         break;
 540                 }
 541
 542                 if (entry->blkaddr == blkaddr)
 543                         del_fsync_inode(entry);
 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, bool check_only)
 555 {
 556         struct list_head inode_list;
 557         struct list_head dir_list;
 558         int err;
 559         int ret = 0;
 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         INIT_LIST_HEAD(&dir_list);
 569
 570         /* prevent checkpoint */
 571         mutex_lock(&sbi->cp_mutex);
 572
 573         /* step #1: find fsynced inode numbers */
 574         err = find_fsync_dnodes(sbi, &inode_list, check_only);
 575         if (err || list_empty(&inode_list))
 576                 goto out;
 577
 578         if (check_only) {
 579                 ret = 1;
 580                 goto out;
 581         }
 582
 583         need_writecp = true;
 584
 585         /* step #2: recover data */
 586         err = recover_data(sbi, &inode_list, &dir_list);
 587         if (!err)
 588                 f2fs_bug_on(sbi, !list_empty(&inode_list));
 589 out:
 590         destroy_fsync_dnodes(&inode_list);
 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                 set_ckpt_flags(sbi, CP_ERROR_FLAG);
 604         mutex_unlock(&sbi->cp_mutex);
 605
 606         /* let's drop all the directory inodes for clean checkpoint */
 607         destroy_fsync_dnodes(&dir_list);
 608
 609         if (!err && need_writecp) {
 610                 struct cp_control cpc = {
 611                         .reason = CP_RECOVERY,
 612                 };
 613                 err = write_checkpoint(sbi, &cpc);
 614         }
 615
 616         kmem_cache_destroy(fsync_entry_slab);
 617         return ret ? ret: err;
 618 }