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         kunmap(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         while (1) {
 174                 struct fsync_inode_entry *entry;
 175
 176                 if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
 177                         return 0;
 178
 179                 page = get_meta_page_ra(sbi, blkaddr);
 180
 181                 if (cp_ver != cpver_of_node(page))
 182                         break;
 183
 184                 if (!is_fsync_dnode(page))
 185                         goto next;
 186
 187                 entry = get_fsync_inode(head, ino_of_node(page));
 188                 if (entry) {
 189                         if (IS_INODE(page) && is_dent_dnode(page))
 190                                 set_inode_flag(F2FS_I(entry->inode),
 191                                                         FI_INC_LINK);
 192                 } else {
 193                         if (IS_INODE(page) && is_dent_dnode(page)) {
 194                                 err = recover_inode_page(sbi, page);
 195                                 if (err)
 196                                         break;
 197                         }
 198
 199                         /* add this fsync inode to the list */
 200                         entry = kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
 201                         if (!entry) {
 202                                 err = -ENOMEM;
 203                                 break;
 204                         }
 205                         /*
 206                          * CP | dnode(F) | inode(DF)
 207                          * For this case, we should not give up now.
 208                          */
 209                         entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
 210                         if (IS_ERR(entry->inode)) {
 211                                 err = PTR_ERR(entry->inode);
 212                                 kmem_cache_free(fsync_entry_slab, entry);
 213                                 if (err == -ENOENT)
 214                                         goto next;
 215                                 break;
 216                         }
 217                         list_add_tail(&entry->list, head);
 218                 }
 219                 entry->blkaddr = blkaddr;
 220
 221                 if (IS_INODE(page)) {
 222                         entry->last_inode = blkaddr;
 223                         if (is_dent_dnode(page))
 224                                 entry->last_dentry = blkaddr;
 225                 }
 226 next:
 227                 /* check next segment */
 228                 blkaddr = next_blkaddr_of_node(page);
 229                 f2fs_put_page(page, 1);
 230         }
 231         f2fs_put_page(page, 1);
 232         return err;
 233 }
 234
 235 static void destroy_fsync_dnodes(struct list_head *head)
 236 {
 237         struct fsync_inode_entry *entry, *tmp;
 238
 239         list_for_each_entry_safe(entry, tmp, head, list) {
 240                 iput(entry->inode);
 241                 list_del(&entry->list);
 242                 kmem_cache_free(fsync_entry_slab, entry);
 243         }
 244 }
 245
 246 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 247                         block_t blkaddr, struct dnode_of_data *dn)
 248 {
 249         struct seg_entry *sentry;
 250         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 251         unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 252         struct f2fs_summary_block *sum_node;
 253         struct f2fs_summary sum;
 254         struct page *sum_page, *node_page;
 255         nid_t ino, nid;
 256         struct inode *inode;
 257         unsigned int offset;
 258         block_t bidx;
 259         int i;
 260
 261         sentry = get_seg_entry(sbi, segno);
 262         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 263                 return 0;
 264
 265         /* Get the previous summary */
 266         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
 267                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 268                 if (curseg->segno == segno) {
 269                         sum = curseg->sum_blk->entries[blkoff];
 270                         goto got_it;
 271                 }
 272         }
 273
 274         sum_page = get_sum_page(sbi, segno);
 275         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
 276         sum = sum_node->entries[blkoff];
 277         f2fs_put_page(sum_page, 1);
 278 got_it:
 279         /* Use the locked dnode page and inode */
 280         nid = le32_to_cpu(sum.nid);
 281         if (dn->inode->i_ino == nid) {
 282                 struct dnode_of_data tdn = *dn;
 283                 tdn.nid = nid;
 284                 tdn.node_page = dn->inode_page;
 285                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 286                 truncate_data_blocks_range(&tdn, 1);
 287                 return 0;
 288         } else if (dn->nid == nid) {
 289                 struct dnode_of_data tdn = *dn;
 290                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 291                 truncate_data_blocks_range(&tdn, 1);
 292                 return 0;
 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         if (ino != dn->inode->i_ino) {
 317                 truncate_hole(inode, bidx, bidx + 1);
 318                 iput(inode);
 319         } else {
 320                 struct dnode_of_data tdn;
 321                 set_new_dnode(&tdn, inode, dn->inode_page, NULL, 0);
 322                 if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
 323                         return 0;
 324                 if (tdn.data_blkaddr != NULL_ADDR)
 325                         truncate_data_blocks_range(&tdn, 1);
 326                 f2fs_put_page(tdn.node_page, 1);
 327         }
 328         return 0;
 329 }
 330
 331 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 332                                         struct page *page, block_t blkaddr)
 333 {
 334         struct f2fs_inode_info *fi = F2FS_I(inode);
 335         unsigned int start, end;
 336         struct dnode_of_data dn;
 337         struct f2fs_summary sum;
 338         struct node_info ni;
 339         int err = 0, recovered = 0;
 340
 341         /* step 1: recover xattr */
 342         if (IS_INODE(page)) {
 343                 recover_inline_xattr(inode, page);
 344         } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
 345                 recover_xattr_data(inode, page, blkaddr);
 346                 goto out;
 347         }
 348
 349         /* step 2: recover inline data */
 350         if (recover_inline_data(inode, page))
 351                 goto out;
 352
 353         /* step 3: recover data indices */
 354         start = start_bidx_of_node(ofs_of_node(page), fi);
 355         end = start + ADDRS_PER_PAGE(page, fi);
 356
 357         f2fs_lock_op(sbi);
 358
 359         set_new_dnode(&dn, inode, NULL, NULL, 0);
 360
 361         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
 362         if (err) {
 363                 f2fs_unlock_op(sbi);
 364                 goto out;
 365         }
 366
 367         f2fs_wait_on_page_writeback(dn.node_page, NODE);
 368
 369         get_node_info(sbi, dn.nid, &ni);
 370         f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
 371         f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
 372
 373         for (; start < end; start++) {
 374                 block_t src, dest;
 375
 376                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
 377                 dest = datablock_addr(page, dn.ofs_in_node);
 378
 379                 if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
 380                         if (src == NULL_ADDR) {
 381                                 err = reserve_new_block(&dn);
 382                                 /* We should not get -ENOSPC */
 383                                 f2fs_bug_on(sbi, err);
 384                         }
 385
 386                         /* Check the previous node page having this index */
 387                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 388                         if (err)
 389                                 goto err;
 390
 391                         set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
 392
 393                         /* write dummy data page */
 394                         recover_data_page(sbi, NULL, &sum, src, dest);
 395                         update_extent_cache(dest, &dn);
 396                         recovered++;
 397                 }
 398                 dn.ofs_in_node++;
 399         }
 400
 401         /* write node page in place */
 402         set_summary(&sum, dn.nid, 0, 0);
 403         if (IS_INODE(dn.node_page))
 404                 sync_inode_page(&dn);
 405
 406         copy_node_footer(dn.node_page, page);
 407         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 408                                         ofs_of_node(page), false);
 409         set_page_dirty(dn.node_page);
 410 err:
 411         f2fs_put_dnode(&dn);
 412         f2fs_unlock_op(sbi);
 413 out:
 414         f2fs_msg(sbi->sb, KERN_NOTICE,
 415                 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
 416                 inode->i_ino, recovered, err);
 417         return err;
 418 }
 419
 420 static int recover_data(struct f2fs_sb_info *sbi,
 421                                 struct list_head *head, int type)
 422 {
 423         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
 424         struct curseg_info *curseg;
 425         struct page *page = NULL;
 426         int err = 0;
 427         block_t blkaddr;
 428
 429         /* get node pages in the current segment */
 430         curseg = CURSEG_I(sbi, type);
 431         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 432
 433         while (1) {
 434                 struct fsync_inode_entry *entry;
 435
 436                 if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
 437                         break;
 438
 439                 page = get_meta_page_ra(sbi, blkaddr);
 440
 441                 if (cp_ver != cpver_of_node(page)) {
 442                         f2fs_put_page(page, 1);
 443                         break;
 444                 }
 445
 446                 entry = get_fsync_inode(head, ino_of_node(page));
 447                 if (!entry)
 448                         goto next;
 449                 /*
 450                  * inode(x) | CP | inode(x) | dnode(F)
 451                  * In this case, we can lose the latest inode(x).
 452                  * So, call recover_inode for the inode update.
 453                  */
 454                 if (entry->last_inode == blkaddr)
 455                         recover_inode(entry->inode, page);
 456                 if (entry->last_dentry == blkaddr) {
 457                         err = recover_dentry(entry->inode, page);
 458                         if (err) {
 459                                 f2fs_put_page(page, 1);
 460                                 break;
 461                         }
 462                 }
 463                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
 464                 if (err) {
 465                         f2fs_put_page(page, 1);
 466                         break;
 467                 }
 468
 469                 if (entry->blkaddr == blkaddr) {
 470                         iput(entry->inode);
 471                         list_del(&entry->list);
 472                         kmem_cache_free(fsync_entry_slab, entry);
 473                 }
 474 next:
 475                 /* check next segment */
 476                 blkaddr = next_blkaddr_of_node(page);
 477                 f2fs_put_page(page, 1);
 478         }
 479         if (!err)
 480                 allocate_new_segments(sbi);
 481         return err;
 482 }
 483
 484 int recover_fsync_data(struct f2fs_sb_info *sbi)
 485 {
 486         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 487         struct list_head inode_list;
 488         block_t blkaddr;
 489         int err;
 490         bool need_writecp = false;
 491
 492         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 493                         sizeof(struct fsync_inode_entry));
 494         if (!fsync_entry_slab)
 495                 return -ENOMEM;
 496
 497         INIT_LIST_HEAD(&inode_list);
 498
 499         /* step #1: find fsynced inode numbers */
 500         sbi->por_doing = true;
 501
 502         /* prevent checkpoint */
 503         mutex_lock(&sbi->cp_mutex);
 504
 505         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 506
 507         err = find_fsync_dnodes(sbi, &inode_list);
 508         if (err)
 509                 goto out;
 510
 511         if (list_empty(&inode_list))
 512                 goto out;
 513
 514         need_writecp = true;
 515
 516         /* step #2: recover data */
 517         err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
 518         if (!err)
 519                 f2fs_bug_on(sbi, !list_empty(&inode_list));
 520 out:
 521         destroy_fsync_dnodes(&inode_list);
 522         kmem_cache_destroy(fsync_entry_slab);
 523
 524         /* truncate meta pages to be used by the recovery */
 525         truncate_inode_pages_range(META_MAPPING(sbi),
 526                         MAIN_BLKADDR(sbi) << PAGE_CACHE_SHIFT, -1);
 527
 528         if (err) {
 529                 truncate_inode_pages_final(NODE_MAPPING(sbi));
 530                 truncate_inode_pages_final(META_MAPPING(sbi));
 531         }
 532
 533         sbi->por_doing = false;
 534         if (err) {
 535                 discard_next_dnode(sbi, blkaddr);
 536
 537                 /* Flush all the NAT/SIT pages */
 538                 while (get_pages(sbi, F2FS_DIRTY_META))
 539                         sync_meta_pages(sbi, META, LONG_MAX);
 540                 set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
 541                 mutex_unlock(&sbi->cp_mutex);
 542         } else if (need_writecp) {
 543                 struct cp_control cpc = {
 544                         .reason = CP_SYNC,
 545                 };
 546                 mutex_unlock(&sbi->cp_mutex);
 547                 write_checkpoint(sbi, &cpc);
 548         } else {
 549                 mutex_unlock(&sbi->cp_mutex);
 550         }
 551         return err;
 552 }