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, bool quota_inode)
  73 {
  74         struct inode *inode;
  75         struct fsync_inode_entry *entry;
  76         int err;
  77
  78         inode = f2fs_iget_retry(sbi->sb, ino);
  79         if (IS_ERR(inode))
  80                 return ERR_CAST(inode);
  81
  82         err = dquot_initialize(inode);
  83         if (err)
  84                 goto err_out;
  85
  86         if (quota_inode) {
  87                 err = dquot_alloc_inode(inode);
  88                 if (err)
  89                         goto err_out;
  90         }
  91
  92         entry = f2fs_kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
  93         entry->inode = inode;
  94         list_add_tail(&entry->list, head);
  95
  96         return entry;
  97 err_out:
  98         iput(inode);
  99         return ERR_PTR(err);
 100 }
 101
 102 static void del_fsync_inode(struct fsync_inode_entry *entry)
 103 {
 104         iput(entry->inode);
 105         list_del(&entry->list);
 106         kmem_cache_free(fsync_entry_slab, entry);
 107 }
 108
 109 static int recover_dentry(struct inode *inode, struct page *ipage,
 110                                                 struct list_head *dir_list)
 111 {
 112         struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
 113         nid_t pino = le32_to_cpu(raw_inode->i_pino);
 114         struct f2fs_dir_entry *de;
 115         struct fscrypt_name fname;
 116         struct page *page;
 117         struct inode *dir, *einode;
 118         struct fsync_inode_entry *entry;
 119         int err = 0;
 120         char *name;
 121
 122         entry = get_fsync_inode(dir_list, pino);
 123         if (!entry) {
 124                 entry = add_fsync_inode(F2FS_I_SB(inode), dir_list,
 125                                                         pino, false);
 126                 if (IS_ERR(entry)) {
 127                         dir = ERR_CAST(entry);
 128                         err = PTR_ERR(entry);
 129                         goto out;
 130                 }
 131         }
 132
 133         dir = entry->inode;
 134
 135         memset(&fname, 0, sizeof(struct fscrypt_name));
 136         fname.disk_name.len = le32_to_cpu(raw_inode->i_namelen);
 137         fname.disk_name.name = raw_inode->i_name;
 138
 139         if (unlikely(fname.disk_name.len > F2FS_NAME_LEN)) {
 140                 WARN_ON(1);
 141                 err = -ENAMETOOLONG;
 142                 goto out;
 143         }
 144 retry:
 145         de = __f2fs_find_entry(dir, &fname, &page);
 146         if (de && inode->i_ino == le32_to_cpu(de->ino))
 147                 goto out_unmap_put;
 148
 149         if (de) {
 150                 einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino));
 151                 if (IS_ERR(einode)) {
 152                         WARN_ON(1);
 153                         err = PTR_ERR(einode);
 154                         if (err == -ENOENT)
 155                                 err = -EEXIST;
 156                         goto out_unmap_put;
 157                 }
 158
 159                 err = dquot_initialize(einode);
 160                 if (err) {
 161                         iput(einode);
 162                         goto out_unmap_put;
 163                 }
 164
 165                 err = acquire_orphan_inode(F2FS_I_SB(inode));
 166                 if (err) {
 167                         iput(einode);
 168                         goto out_unmap_put;
 169                 }
 170                 f2fs_delete_entry(de, page, dir, einode);
 171                 iput(einode);
 172                 goto retry;
 173         } else if (IS_ERR(page)) {
 174                 err = PTR_ERR(page);
 175         } else {
 176                 err = __f2fs_do_add_link(dir, &fname, inode,
 177                                         inode->i_ino, inode->i_mode);
 178         }
 179         if (err == -ENOMEM)
 180                 goto retry;
 181         goto out;
 182
 183 out_unmap_put:
 184         f2fs_dentry_kunmap(dir, page);
 185         f2fs_put_page(page, 0);
 186 out:
 187         if (file_enc_name(inode))
 188                 name = "<encrypted>";
 189         else
 190                 name = raw_inode->i_name;
 191         f2fs_msg(inode->i_sb, KERN_NOTICE,
 192                         "%s: ino = %x, name = %s, dir = %lx, err = %d",
 193                         __func__, ino_of_node(ipage), name,
 194                         IS_ERR(dir) ? 0 : dir->i_ino, err);
 195         return err;
 196 }
 197
 198 static void recover_inode(struct inode *inode, struct page *page)
 199 {
 200         struct f2fs_inode *raw = F2FS_INODE(page);
 201         char *name;
 202
 203         inode->i_mode = le16_to_cpu(raw->i_mode);
 204         f2fs_i_size_write(inode, le64_to_cpu(raw->i_size));
 205         inode->i_atime.tv_sec = le64_to_cpu(raw->i_atime);
 206         inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
 207         inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
 208         inode->i_atime.tv_nsec = le32_to_cpu(raw->i_atime_nsec);
 209         inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
 210         inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
 211
 212         F2FS_I(inode)->i_advise = raw->i_advise;
 213
 214         if (file_enc_name(inode))
 215                 name = "<encrypted>";
 216         else
 217                 name = F2FS_INODE(page)->i_name;
 218
 219         f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
 220                         ino_of_node(page), name);
 221 }
 222
 223 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
 224                                 bool check_only)
 225 {
 226         struct curseg_info *curseg;
 227         struct page *page = NULL;
 228         block_t blkaddr;
 229         int err = 0;
 230
 231         /* get node pages in the current segment */
 232         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 233         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 234
 235         while (1) {
 236                 struct fsync_inode_entry *entry;
 237
 238                 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
 239                         return 0;
 240
 241                 page = get_tmp_page(sbi, blkaddr);
 242
 243                 if (!is_recoverable_dnode(page))
 244                         break;
 245
 246                 if (!is_fsync_dnode(page))
 247                         goto next;
 248
 249                 entry = get_fsync_inode(head, ino_of_node(page));
 250                 if (!entry) {
 251                         bool quota_inode = false;
 252
 253                         if (!check_only &&
 254                                         IS_INODE(page) && is_dent_dnode(page)) {
 255                                 err = recover_inode_page(sbi, page);
 256                                 if (err)
 257                                         break;
 258                                 quota_inode = true;
 259                         }
 260
 261                         /*
 262                          * CP | dnode(F) | inode(DF)
 263                          * For this case, we should not give up now.
 264                          */
 265                         entry = add_fsync_inode(sbi, head, ino_of_node(page),
 266                                                                 quota_inode);
 267                         if (IS_ERR(entry)) {
 268                                 err = PTR_ERR(entry);
 269                                 if (err == -ENOENT) {
 270                                         err = 0;
 271                                         goto next;
 272                                 }
 273                                 break;
 274                         }
 275                 }
 276                 entry->blkaddr = blkaddr;
 277
 278                 if (IS_INODE(page) && is_dent_dnode(page))
 279                         entry->last_dentry = blkaddr;
 280 next:
 281                 /* check next segment */
 282                 blkaddr = next_blkaddr_of_node(page);
 283                 f2fs_put_page(page, 1);
 284
 285                 ra_meta_pages_cond(sbi, blkaddr);
 286         }
 287         f2fs_put_page(page, 1);
 288         return err;
 289 }
 290
 291 static void destroy_fsync_dnodes(struct list_head *head)
 292 {
 293         struct fsync_inode_entry *entry, *tmp;
 294
 295         list_for_each_entry_safe(entry, tmp, head, list)
 296                 del_fsync_inode(entry);
 297 }
 298
 299 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 300                         block_t blkaddr, struct dnode_of_data *dn)
 301 {
 302         struct seg_entry *sentry;
 303         unsigned int segno = GET_SEGNO(sbi, blkaddr);
 304         unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 305         struct f2fs_summary_block *sum_node;
 306         struct f2fs_summary sum;
 307         struct page *sum_page, *node_page;
 308         struct dnode_of_data tdn = *dn;
 309         nid_t ino, nid;
 310         struct inode *inode;
 311         unsigned int offset;
 312         block_t bidx;
 313         int i;
 314
 315         sentry = get_seg_entry(sbi, segno);
 316         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
 317                 return 0;
 318
 319         /* Get the previous summary */
 320         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
 321                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 322                 if (curseg->segno == segno) {
 323                         sum = curseg->sum_blk->entries[blkoff];
 324                         goto got_it;
 325                 }
 326         }
 327
 328         sum_page = get_sum_page(sbi, segno);
 329         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
 330         sum = sum_node->entries[blkoff];
 331         f2fs_put_page(sum_page, 1);
 332 got_it:
 333         /* Use the locked dnode page and inode */
 334         nid = le32_to_cpu(sum.nid);
 335         if (dn->inode->i_ino == nid) {
 336                 tdn.nid = nid;
 337                 if (!dn->inode_page_locked)
 338                         lock_page(dn->inode_page);
 339                 tdn.node_page = dn->inode_page;
 340                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 341                 goto truncate_out;
 342         } else if (dn->nid == nid) {
 343                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
 344                 goto truncate_out;
 345         }
 346
 347         /* Get the node page */
 348         node_page = get_node_page(sbi, nid);
 349         if (IS_ERR(node_page))
 350                 return PTR_ERR(node_page);
 351
 352         offset = ofs_of_node(node_page);
 353         ino = ino_of_node(node_page);
 354         f2fs_put_page(node_page, 1);
 355
 356         if (ino != dn->inode->i_ino) {
 357                 int ret;
 358
 359                 /* Deallocate previous index in the node page */
 360                 inode = f2fs_iget_retry(sbi->sb, ino);
 361                 if (IS_ERR(inode))
 362                         return PTR_ERR(inode);
 363
 364                 ret = dquot_initialize(inode);
 365                 if (ret) {
 366                         iput(inode);
 367                         return ret;
 368                 }
 369         } else {
 370                 inode = dn->inode;
 371         }
 372
 373         bidx = start_bidx_of_node(offset, inode) + le16_to_cpu(sum.ofs_in_node);
 374
 375         /*
 376          * if inode page is locked, unlock temporarily, but its reference
 377          * count keeps alive.
 378          */
 379         if (ino == dn->inode->i_ino && dn->inode_page_locked)
 380                 unlock_page(dn->inode_page);
 381
 382         set_new_dnode(&tdn, inode, NULL, NULL, 0);
 383         if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
 384                 goto out;
 385
 386         if (tdn.data_blkaddr == blkaddr)
 387                 truncate_data_blocks_range(&tdn, 1);
 388
 389         f2fs_put_dnode(&tdn);
 390 out:
 391         if (ino != dn->inode->i_ino)
 392                 iput(inode);
 393         else if (dn->inode_page_locked)
 394                 lock_page(dn->inode_page);
 395         return 0;
 396
 397 truncate_out:
 398         if (datablock_addr(tdn.inode, tdn.node_page,
 399                                         tdn.ofs_in_node) == blkaddr)
 400                 truncate_data_blocks_range(&tdn, 1);
 401         if (dn->inode->i_ino == nid && !dn->inode_page_locked)
 402                 unlock_page(dn->inode_page);
 403         return 0;
 404 }
 405
 406 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 407                                         struct page *page, block_t blkaddr)
 408 {
 409         struct dnode_of_data dn;
 410         struct node_info ni;
 411         unsigned int start, end;
 412         int err = 0, recovered = 0;
 413
 414         /* step 1: recover xattr */
 415         if (IS_INODE(page)) {
 416                 recover_inline_xattr(inode, page);
 417         } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
 418                 err = recover_xattr_data(inode, page, blkaddr);
 419                 if (!err)
 420                         recovered++;
 421                 goto out;
 422         }
 423
 424         /* step 2: recover inline data */
 425         if (recover_inline_data(inode, page))
 426                 goto out;
 427
 428         /* step 3: recover data indices */
 429         start = start_bidx_of_node(ofs_of_node(page), inode);
 430         end = start + ADDRS_PER_PAGE(page, inode);
 431
 432         set_new_dnode(&dn, inode, NULL, NULL, 0);
 433 retry_dn:
 434         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
 435         if (err) {
 436                 if (err == -ENOMEM) {
 437                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 438                         goto retry_dn;
 439                 }
 440                 goto out;
 441         }
 442
 443         f2fs_wait_on_page_writeback(dn.node_page, NODE, true);
 444
 445         get_node_info(sbi, dn.nid, &ni);
 446         f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
 447         f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
 448
 449         for (; start < end; start++, dn.ofs_in_node++) {
 450                 block_t src, dest;
 451
 452                 src = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node);
 453                 dest = datablock_addr(dn.inode, page, dn.ofs_in_node);
 454
 455                 /* skip recovering if dest is the same as src */
 456                 if (src == dest)
 457                         continue;
 458
 459                 /* dest is invalid, just invalidate src block */
 460                 if (dest == NULL_ADDR) {
 461                         truncate_data_blocks_range(&dn, 1);
 462                         continue;
 463                 }
 464
 465                 if (!file_keep_isize(inode) &&
 466                         (i_size_read(inode) <= ((loff_t)start << PAGE_SHIFT)))
 467                         f2fs_i_size_write(inode,
 468                                 (loff_t)(start + 1) << PAGE_SHIFT);
 469
 470                 /*
 471                  * dest is reserved block, invalidate src block
 472                  * and then reserve one new block in dnode page.
 473                  */
 474                 if (dest == NEW_ADDR) {
 475                         truncate_data_blocks_range(&dn, 1);
 476                         reserve_new_block(&dn);
 477                         continue;
 478                 }
 479
 480                 /* dest is valid block, try to recover from src to dest */
 481                 if (is_valid_blkaddr(sbi, dest, META_POR)) {
 482
 483                         if (src == NULL_ADDR) {
 484                                 err = reserve_new_block(&dn);
 485 #ifdef CONFIG_F2FS_FAULT_INJECTION
 486                                 while (err)
 487                                         err = reserve_new_block(&dn);
 488 #endif
 489                                 /* We should not get -ENOSPC */
 490                                 f2fs_bug_on(sbi, err);
 491                                 if (err)
 492                                         goto err;
 493                         }
 494 retry_prev:
 495                         /* Check the previous node page having this index */
 496                         err = check_index_in_prev_nodes(sbi, dest, &dn);
 497                         if (err) {
 498                                 if (err == -ENOMEM) {
 499                                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 500                                         goto retry_prev;
 501                                 }
 502                                 goto err;
 503                         }
 504
 505                         /* write dummy data page */
 506                         f2fs_replace_block(sbi, &dn, src, dest,
 507                                                 ni.version, false, false);
 508                         recovered++;
 509                 }
 510         }
 511
 512         copy_node_footer(dn.node_page, page);
 513         fill_node_footer(dn.node_page, dn.nid, ni.ino,
 514                                         ofs_of_node(page), false);
 515         set_page_dirty(dn.node_page);
 516 err:
 517         f2fs_put_dnode(&dn);
 518 out:
 519         f2fs_msg(sbi->sb, KERN_NOTICE,
 520                 "recover_data: ino = %lx (i_size: %s) recovered = %d, err = %d",
 521                 inode->i_ino,
 522                 file_keep_isize(inode) ? "keep" : "recover",
 523                 recovered, err);
 524         return err;
 525 }
 526
 527 static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
 528                                                 struct list_head *dir_list)
 529 {
 530         struct curseg_info *curseg;
 531         struct page *page = NULL;
 532         int err = 0;
 533         block_t blkaddr;
 534
 535         /* get node pages in the current segment */
 536         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 537         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 538
 539         while (1) {
 540                 struct fsync_inode_entry *entry;
 541
 542                 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
 543                         break;
 544
 545                 ra_meta_pages_cond(sbi, blkaddr);
 546
 547                 page = get_tmp_page(sbi, blkaddr);
 548
 549                 if (!is_recoverable_dnode(page)) {
 550                         f2fs_put_page(page, 1);
 551                         break;
 552                 }
 553
 554                 entry = get_fsync_inode(inode_list, ino_of_node(page));
 555                 if (!entry)
 556                         goto next;
 557                 /*
 558                  * inode(x) | CP | inode(x) | dnode(F)
 559                  * In this case, we can lose the latest inode(x).
 560                  * So, call recover_inode for the inode update.
 561                  */
 562                 if (IS_INODE(page))
 563                         recover_inode(entry->inode, page);
 564                 if (entry->last_dentry == blkaddr) {
 565                         err = recover_dentry(entry->inode, page, dir_list);
 566                         if (err) {
 567                                 f2fs_put_page(page, 1);
 568                                 break;
 569                         }
 570                 }
 571                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
 572                 if (err) {
 573                         f2fs_put_page(page, 1);
 574                         break;
 575                 }
 576
 577                 if (entry->blkaddr == blkaddr)
 578                         del_fsync_inode(entry);
 579 next:
 580                 /* check next segment */
 581                 blkaddr = next_blkaddr_of_node(page);
 582                 f2fs_put_page(page, 1);
 583         }
 584         if (!err)
 585                 allocate_new_segments(sbi);
 586         return err;
 587 }
 588
 589 int recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
 590 {
 591         struct list_head inode_list;
 592         struct list_head dir_list;
 593         int err;
 594         int ret = 0;
 595         unsigned long s_flags = sbi->sb->s_flags;
 596         bool need_writecp = false;
 597
 598         if (s_flags & MS_RDONLY) {
 599                 f2fs_msg(sbi->sb, KERN_INFO, "orphan cleanup on readonly fs");
 600                 sbi->sb->s_flags &= ~MS_RDONLY;
 601         }
 602
 603 #ifdef CONFIG_QUOTA
 604         /* Needed for iput() to work correctly and not trash data */
 605         sbi->sb->s_flags |= MS_ACTIVE;
 606         /* Turn on quotas so that they are updated correctly */
 607         f2fs_enable_quota_files(sbi);
 608 #endif
 609
 610         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
 611                         sizeof(struct fsync_inode_entry));
 612         if (!fsync_entry_slab) {
 613                 err = -ENOMEM;
 614                 goto out;
 615         }
 616
 617         INIT_LIST_HEAD(&inode_list);
 618         INIT_LIST_HEAD(&dir_list);
 619
 620         /* prevent checkpoint */
 621         mutex_lock(&sbi->cp_mutex);
 622
 623         /* step #1: find fsynced inode numbers */
 624         err = find_fsync_dnodes(sbi, &inode_list, check_only);
 625         if (err || list_empty(&inode_list))
 626                 goto skip;
 627
 628         if (check_only) {
 629                 ret = 1;
 630                 goto skip;
 631         }
 632
 633         need_writecp = true;
 634
 635         /* step #2: recover data */
 636         err = recover_data(sbi, &inode_list, &dir_list);
 637         if (!err)
 638                 f2fs_bug_on(sbi, !list_empty(&inode_list));
 639 skip:
 640         destroy_fsync_dnodes(&inode_list);
 641
 642         /* truncate meta pages to be used by the recovery */
 643         truncate_inode_pages_range(META_MAPPING(sbi),
 644                         (loff_t)MAIN_BLKADDR(sbi) << PAGE_SHIFT, -1);
 645
 646         if (err) {
 647                 truncate_inode_pages_final(NODE_MAPPING(sbi));
 648                 truncate_inode_pages_final(META_MAPPING(sbi));
 649         }
 650
 651         clear_sbi_flag(sbi, SBI_POR_DOING);
 652         if (err)
 653                 set_ckpt_flags(sbi, CP_ERROR_FLAG);
 654         mutex_unlock(&sbi->cp_mutex);
 655
 656         /* let's drop all the directory inodes for clean checkpoint */
 657         destroy_fsync_dnodes(&dir_list);
 658
 659         if (!err && need_writecp) {
 660                 struct cp_control cpc = {
 661                         .reason = CP_RECOVERY,
 662                 };
 663                 err = write_checkpoint(sbi, &cpc);
 664         }
 665
 666         kmem_cache_destroy(fsync_entry_slab);
 667 out:
 668 #ifdef CONFIG_QUOTA
 669         /* Turn quotas off */
 670         f2fs_quota_off_umount(sbi->sb);
 671 #endif
 672         sbi->sb->s_flags = s_flags; /* Restore MS_RDONLY status */
 673
 674         return ret ? ret: err;
 675 }