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