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                 recover_xattr_data(inode, page, blkaddr);
 350                 goto out;
 351         }
 352
 353         /* step 2: recover inline data */
 354         if (recover_inline_data(inode, page))
 355                 goto out;
 356
 357         /* step 3: recover data indices */
 358         start = start_bidx_of_node(ofs_of_node(page), fi);
 359         end = start + ADDRS_PER_PAGE(page, fi);
 360
 361         f2fs_lock_op(sbi);
 362
 363         set_new_dnode(&dn, inode, NULL, NULL, 0);
 364
 365         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
 366         if (err) {
 367                 f2fs_unlock_op(sbi);
 368                 goto out;
 369         }
 370
 371         f2fs_wait_on_page_writeback(dn.node_page, NODE);
 372
 373         get_node_info(sbi, dn.nid, &ni);
 374         f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
 375         f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
 376
 377         for (; start < end; start++) {
 378                 block_t src, dest;
 379
 380                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
 381                 dest = datablock_addr(page, dn.ofs_in_node);
 382
 383                 if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
 384                         if (src == NULL_ADDR) {
 385                                 err = reserve_new_block(&dn);
 386                                 /* We should not get -ENOSPC */
 387                                 f2fs_bug_on(sbi, err);
 388                         }
 389
 390                         /* Check the previous node page having this index */
 391                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 392                         if (err)
 393                                 goto err;
 394
 395                         set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
 396
 397                         /* write dummy data page */
 398                         recover_data_page(sbi, NULL, &sum, src, dest);
 399                         dn.data_blkaddr = dest;
 400                         update_extent_cache(&dn);
 401                         recovered++;
 402                 }
 403                 dn.ofs_in_node++;
 404         }
 405
 406         /* write node page in place */
 407         set_summary(&sum, dn.nid, 0, 0);
 408         if (IS_INODE(dn.node_page))
 409                 sync_inode_page(&dn);
 410
 411         copy_node_footer(dn.node_page, page);
 412         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 413                                         ofs_of_node(page), false);
 414         set_page_dirty(dn.node_page);
 415 err:
 416         f2fs_put_dnode(&dn);
 417         f2fs_unlock_op(sbi);
 418 out:
 419         f2fs_msg(sbi->sb, KERN_NOTICE,
 420                 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
 421                 inode->i_ino, recovered, err);
 422         return err;
 423 }
 424
 425 static int recover_data(struct f2fs_sb_info *sbi,
 426                                 struct list_head *head, int type)
 427 {
 428         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 429         struct curseg_info *curseg;
 430         struct page *page = NULL;
 431         int err = 0;
 432         block_t blkaddr;
 433
 434         /* get node pages in the current segment */
 435         curseg = CURSEG_I(sbi, type);
 436         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 437
 438         while (1) {
 439                 struct fsync_inode_entry *entry;
 440
 441                 if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
 442                         break;
 443
 444                 ra_meta_pages_cond(sbi, blkaddr);
 445
 446                 page = get_meta_page(sbi, blkaddr);
 447
 448                 if (cp_ver != cpver_of_node(page)) {
 449                         f2fs_put_page(page, 1);
 450                         break;
 451                 }
 452
 453                 entry = get_fsync_inode(head, ino_of_node(page));
 454                 if (!entry)
 455                         goto next;
 456                 /*
 457                  * inode(x) | CP | inode(x) | dnode(F)
 458                  * In this case, we can lose the latest inode(x).
 459                  * So, call recover_inode for the inode update.
 460                  */
 461                 if (entry->last_inode == blkaddr)
 462                         recover_inode(entry->inode, page);
 463                 if (entry->last_dentry == blkaddr) {
 464                         err = recover_dentry(entry->inode, page);
 465                         if (err) {
 466                                 f2fs_put_page(page, 1);
 467                                 break;
 468                         }
 469                 }
 470                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
 471                 if (err) {
 472                         f2fs_put_page(page, 1);
 473                         break;
 474                 }
 475
 476                 if (entry->blkaddr == blkaddr) {
 477                         iput(entry->inode);
 478                         list_del(&entry->list);
 479                         kmem_cache_free(fsync_entry_slab, entry);
 480                 }
 481 next:
 482                 /* check next segment */
 483                 blkaddr = next_blkaddr_of_node(page);
 484                 f2fs_put_page(page, 1);
 485         }
 486         if (!err)
 487                 allocate_new_segments(sbi);
 488         return err;
 489 }
 490
 491 int recover_fsync_data(struct f2fs_sb_info *sbi)
 492 {
 493         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 494         struct list_head inode_list;
 495         block_t blkaddr;
 496         int err;
 497         bool need_writecp = false;
 498
 499         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 500                         sizeof(struct fsync_inode_entry));
 501         if (!fsync_entry_slab)
 502                 return -ENOMEM;
 503
 504         INIT_LIST_HEAD(&inode_list);
 505
 506         /* step #1: find fsynced inode numbers */
 507         sbi->por_doing = true;
 508
 509         /* prevent checkpoint */
 510         mutex_lock(&sbi->cp_mutex);
 511
 512         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 513
 514         err = find_fsync_dnodes(sbi, &inode_list);
 515         if (err)
 516                 goto out;
 517
 518         if (list_empty(&inode_list))
 519                 goto out;
 520
 521         need_writecp = true;
 522
 523         /* step #2: recover data */
 524         err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
 525         if (!err)
 526                 f2fs_bug_on(sbi, !list_empty(&inode_list));
 527 out:
 528         destroy_fsync_dnodes(&inode_list);
 529         kmem_cache_destroy(fsync_entry_slab);
 530
 531         /* truncate meta pages to be used by the recovery */
 532         truncate_inode_pages_range(META_MAPPING(sbi),
 533                         MAIN_BLKADDR(sbi) << PAGE_CACHE_SHIFT, -1);
 534
 535         if (err) {
 536                 truncate_inode_pages_final(NODE_MAPPING(sbi));
 537                 truncate_inode_pages_final(META_MAPPING(sbi));
 538         }
 539
 540         sbi->por_doing = false;
 541         if (err) {
 542                 discard_next_dnode(sbi, blkaddr);
 543
 544                 /* Flush all the NAT/SIT pages */
 545                 while (get_pages(sbi, F2FS_DIRTY_META))
 546                         sync_meta_pages(sbi, META, LONG_MAX);
 547                 set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
 548                 mutex_unlock(&sbi->cp_mutex);
 549         } else if (need_writecp) {
 550                 struct cp_control cpc = {
 551                         .reason = CP_SYNC,
 552                 };
 553                 mutex_unlock(&sbi->cp_mutex);
 554                 write_checkpoint(sbi, &cpc);
 555         } else {
 556                 mutex_unlock(&sbi->cp_mutex);
 557         }
 558         return err;
 559 }