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         name.len = le32_to_cpu(raw_inode->i_namelen);
  87         name.name = raw_inode->i_name;
  88
  89         if (unlikely(name.len > F2FS_NAME_LEN)) {
  90                 WARN_ON(1);
  91                 err = -ENAMETOOLONG;
  92                 goto out_err;
  93         }
  94 retry:
  95         de = f2fs_find_entry(dir, &name, &page);
  96         if (de && inode->i_ino == le32_to_cpu(de->ino))
  97                 goto out_unmap_put;
  98
  99         if (de) {
 100                 einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
 101                 if (IS_ERR(einode)) {
 102                         WARN_ON(1);
 103                         err = PTR_ERR(einode);
 104                         if (err == -ENOENT)
 105                                 err = -EEXIST;
 106                         goto out_unmap_put;
 107                 }
 108                 err = acquire_orphan_inode(F2FS_I_SB(inode));
 109                 if (err) {
 110                         iput(einode);
 111                         goto out_unmap_put;
 112                 }
 113                 f2fs_delete_entry(de, page, dir, einode);
 114                 iput(einode);
 115                 goto retry;
 116         }
 117         err = __f2fs_add_link(dir, &name, inode, inode->i_ino, inode->i_mode);
 118         if (err)
 119                 goto out_err;
 120
 121         if (is_inode_flag_set(F2FS_I(dir), FI_DELAY_IPUT)) {
 122                 iput(dir);
 123         } else {
 124                 add_dirty_dir_inode(dir);
 125                 set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
 126         }
 127
 128         goto out;
 129
 130 out_unmap_put:
 131         f2fs_dentry_kunmap(dir, page);
 132         f2fs_put_page(page, 0);
 133 out_err:
 134         iput(dir);
 135 out:
 136         f2fs_msg(inode->i_sb, KERN_NOTICE,
 137                         "%s: ino = %x, name = %s, dir = %lx, err = %d",
 138                         __func__, ino_of_node(ipage), raw_inode->i_name,
 139                         IS_ERR(dir) ? 0 : dir->i_ino, err);
 140         return err;
 141 }
 142
 143 static void recover_inode(struct inode *inode, struct page *page)
 144 {
 145         struct f2fs_inode *raw = F2FS_INODE(page);
 146
 147         inode->i_mode = le16_to_cpu(raw->i_mode);
 148         i_size_write(inode, le64_to_cpu(raw->i_size));
 149         inode->i_atime.tv_sec = le64_to_cpu(raw->i_mtime);
 150         inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
 151         inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
 152         inode->i_atime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
 153         inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
 154         inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
 155
 156         f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
 157                         ino_of_node(page), F2FS_INODE(page)->i_name);
 158 }
 159
 160 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
 161 {
 162         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 163         struct curseg_info *curseg;
 164         struct page *page = NULL;
 165         block_t blkaddr;
 166         int err = 0;
 167
 168         /* get node pages in the current segment */
 169         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 170         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 171
 172         ra_meta_pages(sbi, blkaddr, 1, META_POR);
 173
 174         while (1) {
 175                 struct fsync_inode_entry *entry;
 176
 177                 if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
 178                         return 0;
 179
 180                 page = get_meta_page(sbi, blkaddr);
 181
 182                 if (cp_ver != cpver_of_node(page))
 183                         break;
 184
 185                 if (!is_fsync_dnode(page))
 186                         goto next;
 187
 188                 entry = get_fsync_inode(head, ino_of_node(page));
 189                 if (!entry) {
 190                         if (IS_INODE(page) && is_dent_dnode(page)) {
 191                                 err = recover_inode_page(sbi, page);
 192                                 if (err)
 193                                         break;
 194                         }
 195
 196                         /* add this fsync inode to the list */
 197                         entry = kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
 198                         if (!entry) {
 199                                 err = -ENOMEM;
 200                                 break;
 201                         }
 202                         /*
 203                          * CP | dnode(F) | inode(DF)
 204                          * For this case, we should not give up now.
 205                          */
 206                         entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
 207                         if (IS_ERR(entry->inode)) {
 208                                 err = PTR_ERR(entry->inode);
 209                                 kmem_cache_free(fsync_entry_slab, entry);
 210                                 if (err == -ENOENT) {
 211                                         err = 0;
 212                                         goto next;
 213                                 }
 214                                 break;
 215                         }
 216                         list_add_tail(&entry->list, head);
 217                 }
 218                 entry->blkaddr = blkaddr;
 219
 220                 if (IS_INODE(page)) {
 221                         entry->last_inode = blkaddr;
 222                         if (is_dent_dnode(page))
 223                                 entry->last_dentry = blkaddr;
 224                 }
 225 next:
 226                 /* check next segment */
 227                 blkaddr = next_blkaddr_of_node(page);
 228                 f2fs_put_page(page, 1);
 229
 230                 ra_meta_pages_cond(sbi, blkaddr);
 231         }
 232         f2fs_put_page(page, 1);
 233         return err;
 234 }
 235
 236 static void destroy_fsync_dnodes(struct list_head *head)
 237 {
 238         struct fsync_inode_entry *entry, *tmp;
 239
 240         list_for_each_entry_safe(entry, tmp, head, list) {
 241                 iput(entry->inode);
 242                 list_del(&entry->list);
 243                 kmem_cache_free(fsync_entry_slab, entry);
 244         }
 245 }
 246
 247 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 248                         block_t blkaddr, struct dnode_of_data *dn)
 249 {
 250         struct seg_entry *sentry;
 251         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 252         unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 253         struct f2fs_summary_block *sum_node;
 254         struct f2fs_summary sum;
 255         struct page *sum_page, *node_page;
 256         struct dnode_of_data tdn = *dn;
 257         nid_t ino, nid;
 258         struct inode *inode;
 259         unsigned int offset;
 260         block_t bidx;
 261         int i;
 262
 263         sentry = get_seg_entry(sbi, segno);
 264         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 265                 return 0;
 266
 267         /* Get the previous summary */
 268         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
 269                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 270                 if (curseg->segno == segno) {
 271                         sum = curseg->sum_blk->entries[blkoff];
 272                         goto got_it;
 273                 }
 274         }
 275
 276         sum_page = get_sum_page(sbi, segno);
 277         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
 278         sum = sum_node->entries[blkoff];
 279         f2fs_put_page(sum_page, 1);
 280 got_it:
 281         /* Use the locked dnode page and inode */
 282         nid = le32_to_cpu(sum.nid);
 283         if (dn->inode->i_ino == nid) {
 284                 tdn.nid = nid;
 285                 if (!dn->inode_page_locked)
 286                         lock_page(dn->inode_page);
 287                 tdn.node_page = dn->inode_page;
 288                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 289                 goto truncate_out;
 290         } else if (dn->nid == nid) {
 291                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 292                 goto truncate_out;
 293         }
 294
 295         /* Get the node page */
 296         node_page = get_node_page(sbi, nid);
 297         if (IS_ERR(node_page))
 298                 return PTR_ERR(node_page);
 299
 300         offset = ofs_of_node(node_page);
 301         ino = ino_of_node(node_page);
 302         f2fs_put_page(node_page, 1);
 303
 304         if (ino != dn->inode->i_ino) {
 305                 /* Deallocate previous index in the node page */
 306                 inode = f2fs_iget(sbi->sb, ino);
 307                 if (IS_ERR(inode))
 308                         return PTR_ERR(inode);
 309         } else {
 310                 inode = dn->inode;
 311         }
 312
 313         bidx = start_bidx_of_node(offset, F2FS_I(inode)) +
 314                         le16_to_cpu(sum.ofs_in_node);
 315
 316         /*
 317          * if inode page is locked, unlock temporarily, but its reference
 318          * count keeps alive.
 319          */
 320         if (ino == dn->inode->i_ino && dn->inode_page_locked)
 321                 unlock_page(dn->inode_page);
 322
 323         set_new_dnode(&tdn, inode, NULL, NULL, 0);
 324         if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
 325                 goto out;
 326
 327         if (tdn.data_blkaddr == blkaddr)
 328                 truncate_data_blocks_range(&tdn, 1);
 329
 330         f2fs_put_dnode(&tdn);
 331 out:
 332         if (ino != dn->inode->i_ino)
 333                 iput(inode);
 334         else if (dn->inode_page_locked)
 335                 lock_page(dn->inode_page);
 336         return 0;
 337
 338 truncate_out:
 339         if (datablock_addr(tdn.node_page, tdn.ofs_in_node) == blkaddr)
 340                 truncate_data_blocks_range(&tdn, 1);
 341         if (dn->inode->i_ino == nid && !dn->inode_page_locked)
 342                 unlock_page(dn->inode_page);
 343         return 0;
 344 }
 345
 346 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 347                                         struct page *page, block_t blkaddr)
 348 {
 349         struct f2fs_inode_info *fi = F2FS_I(inode);
 350         unsigned int start, end;
 351         struct dnode_of_data dn;
 352         struct f2fs_summary sum;
 353         struct node_info ni;
 354         int err = 0, recovered = 0;
 355
 356         /* step 1: recover xattr */
 357         if (IS_INODE(page)) {
 358                 recover_inline_xattr(inode, page);
 359         } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
 360                 /*
 361                  * Deprecated; xattr blocks should be found from cold log.
 362                  * But, we should remain this for backward compatibility.
 363                  */
 364                 recover_xattr_data(inode, page, blkaddr);
 365                 goto out;
 366         }
 367
 368         /* step 2: recover inline data */
 369         if (recover_inline_data(inode, page))
 370                 goto out;
 371
 372         /* step 3: recover data indices */
 373         start = start_bidx_of_node(ofs_of_node(page), fi);
 374         end = start + ADDRS_PER_PAGE(page, fi);
 375
 376         f2fs_lock_op(sbi);
 377
 378         set_new_dnode(&dn, inode, NULL, NULL, 0);
 379
 380         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
 381         if (err) {
 382                 f2fs_unlock_op(sbi);
 383                 goto out;
 384         }
 385
 386         f2fs_wait_on_page_writeback(dn.node_page, NODE);
 387
 388         get_node_info(sbi, dn.nid, &ni);
 389         f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
 390         f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
 391
 392         for (; start < end; start++) {
 393                 block_t src, dest;
 394
 395                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
 396                 dest = datablock_addr(page, dn.ofs_in_node);
 397
 398                 if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR &&
 399                         dest >= MAIN_BLKADDR(sbi) && dest < MAX_BLKADDR(sbi)) {
 400
 401                         if (src == NULL_ADDR) {
 402                                 err = reserve_new_block(&dn);
 403                                 /* We should not get -ENOSPC */
 404                                 f2fs_bug_on(sbi, err);
 405                         }
 406
 407                         /* Check the previous node page having this index */
 408                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 409                         if (err)
 410                                 goto err;
 411
 412                         set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
 413
 414                         /* write dummy data page */
 415                         recover_data_page(sbi, NULL, &sum, src, dest);
 416                         dn.data_blkaddr = dest;
 417                         set_data_blkaddr(&dn);
 418                         f2fs_update_extent_cache(&dn);
 419                         recovered++;
 420                 }
 421                 dn.ofs_in_node++;
 422         }
 423
 424         if (IS_INODE(dn.node_page))
 425                 sync_inode_page(&dn);
 426
 427         copy_node_footer(dn.node_page, page);
 428         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 429                                         ofs_of_node(page), false);
 430         set_page_dirty(dn.node_page);
 431 err:
 432         f2fs_put_dnode(&dn);
 433         f2fs_unlock_op(sbi);
 434 out:
 435         f2fs_msg(sbi->sb, KERN_NOTICE,
 436                 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
 437                 inode->i_ino, recovered, err);
 438         return err;
 439 }
 440
 441 static int recover_data(struct f2fs_sb_info *sbi,
 442                                 struct list_head *head, int type)
 443 {
 444         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 445         struct curseg_info *curseg;
 446         struct page *page = NULL;
 447         int err = 0;
 448         block_t blkaddr;
 449
 450         /* get node pages in the current segment */
 451         curseg = CURSEG_I(sbi, type);
 452         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 453
 454         while (1) {
 455                 struct fsync_inode_entry *entry;
 456
 457                 if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
 458                         break;
 459
 460                 ra_meta_pages_cond(sbi, blkaddr);
 461
 462                 page = get_meta_page(sbi, blkaddr);
 463
 464                 if (cp_ver != cpver_of_node(page)) {
 465                         f2fs_put_page(page, 1);
 466                         break;
 467                 }
 468
 469                 entry = get_fsync_inode(head, ino_of_node(page));
 470                 if (!entry)
 471                         goto next;
 472                 /*
 473                  * inode(x) | CP | inode(x) | dnode(F)
 474                  * In this case, we can lose the latest inode(x).
 475                  * So, call recover_inode for the inode update.
 476                  */
 477                 if (entry->last_inode == blkaddr)
 478                         recover_inode(entry->inode, page);
 479                 if (entry->last_dentry == blkaddr) {
 480                         err = recover_dentry(entry->inode, page);
 481                         if (err) {
 482                                 f2fs_put_page(page, 1);
 483                                 break;
 484                         }
 485                 }
 486                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
 487                 if (err) {
 488                         f2fs_put_page(page, 1);
 489                         break;
 490                 }
 491
 492                 if (entry->blkaddr == blkaddr) {
 493                         iput(entry->inode);
 494                         list_del(&entry->list);
 495                         kmem_cache_free(fsync_entry_slab, entry);
 496                 }
 497 next:
 498                 /* check next segment */
 499                 blkaddr = next_blkaddr_of_node(page);
 500                 f2fs_put_page(page, 1);
 501         }
 502         if (!err)
 503                 allocate_new_segments(sbi);
 504         return err;
 505 }
 506
 507 int recover_fsync_data(struct f2fs_sb_info *sbi)
 508 {
 509         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 510         struct list_head inode_list;
 511         block_t blkaddr;
 512         int err;
 513         bool need_writecp = false;
 514
 515         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 516                         sizeof(struct fsync_inode_entry));
 517         if (!fsync_entry_slab)
 518                 return -ENOMEM;
 519
 520         INIT_LIST_HEAD(&inode_list);
 521
 522         /* step #1: find fsynced inode numbers */
 523         set_sbi_flag(sbi, SBI_POR_DOING);
 524
 525         /* prevent checkpoint */
 526         mutex_lock(&sbi->cp_mutex);
 527
 528         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 529
 530         err = find_fsync_dnodes(sbi, &inode_list);
 531         if (err)
 532                 goto out;
 533
 534         if (list_empty(&inode_list))
 535                 goto out;
 536
 537         need_writecp = true;
 538
 539         /* step #2: recover data */
 540         err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
 541         if (!err)
 542                 f2fs_bug_on(sbi, !list_empty(&inode_list));
 543 out:
 544         destroy_fsync_dnodes(&inode_list);
 545         kmem_cache_destroy(fsync_entry_slab);
 546
 547         /* truncate meta pages to be used by the recovery */
 548         truncate_inode_pages_range(META_MAPPING(sbi),
 549                         MAIN_BLKADDR(sbi) << PAGE_CACHE_SHIFT, -1);
 550
 551         if (err) {
 552                 truncate_inode_pages_final(NODE_MAPPING(sbi));
 553                 truncate_inode_pages_final(META_MAPPING(sbi));
 554         }
 555
 556         clear_sbi_flag(sbi, SBI_POR_DOING);
 557         if (err) {
 558                 discard_next_dnode(sbi, blkaddr);
 559
 560                 /* Flush all the NAT/SIT pages */
 561                 while (get_pages(sbi, F2FS_DIRTY_META))
 562                         sync_meta_pages(sbi, META, LONG_MAX);
 563                 set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
 564                 mutex_unlock(&sbi->cp_mutex);
 565         } else if (need_writecp) {
 566                 struct cp_control cpc = {
 567                         .reason = CP_RECOVERY,
 568                 };
 569                 mutex_unlock(&sbi->cp_mutex);
 570                 write_checkpoint(sbi, &cpc);
 571         } else {
 572                 mutex_unlock(&sbi->cp_mutex);
 573         }
 574         return err;
 575 }