fs/f2fs/checkpoint.c

   1 /*
   2  * fs/f2fs/checkpoint.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/bio.h>
  13 #include <linux/mpage.h>
  14 #include <linux/writeback.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/f2fs_fs.h>
  17 #include <linux/pagevec.h>
  18 #include <linux/swap.h>
  19
  20 #include "f2fs.h"
  21 #include "node.h"
  22 #include "segment.h"
  23 #include "trace.h"
  24 #include <trace/events/f2fs.h>
  25
  26 static struct kmem_cache *ino_entry_slab;
  27 struct kmem_cache *inode_entry_slab;
  28
  29 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
  30 {
  31         set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
  32         sbi->sb->s_flags |= MS_RDONLY;
  33         if (!end_io)
  34                 f2fs_flush_merged_bios(sbi);
  35 }
  36
  37 /*
  38  * We guarantee no failure on the returned page.
  39  */
  40 struct page *grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  41 {
  42         struct address_space *mapping = META_MAPPING(sbi);
  43         struct page *page = NULL;
  44 repeat:
  45         page = f2fs_grab_cache_page(mapping, index, false);
  46         if (!page) {
  47                 cond_resched();
  48                 goto repeat;
  49         }
  50         f2fs_wait_on_page_writeback(page, META, true);
  51         SetPageUptodate(page);
  52         return page;
  53 }
  54
  55 /*
  56  * We guarantee no failure on the returned page.
  57  */
  58 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
  59                                                         bool is_meta)
  60 {
  61         struct address_space *mapping = META_MAPPING(sbi);
  62         struct page *page;
  63         struct f2fs_io_info fio = {
  64                 .sbi = sbi,
  65                 .type = META,
  66                 .rw = READ_SYNC | REQ_META | REQ_PRIO,
  67                 .old_blkaddr = index,
  68                 .new_blkaddr = index,
  69                 .encrypted_page = NULL,
  70         };
  71
  72         if (unlikely(!is_meta))
  73                 fio.rw &= ~REQ_META;
  74 repeat:
  75         page = f2fs_grab_cache_page(mapping, index, false);
  76         if (!page) {
  77                 cond_resched();
  78                 goto repeat;
  79         }
  80         if (PageUptodate(page))
  81                 goto out;
  82
  83         fio.page = page;
  84
  85         if (f2fs_submit_page_bio(&fio)) {
  86                 f2fs_put_page(page, 1);
  87                 goto repeat;
  88         }
  89
  90         lock_page(page);
  91         if (unlikely(page->mapping != mapping)) {
  92                 f2fs_put_page(page, 1);
  93                 goto repeat;
  94         }
  95
  96         /*
  97          * if there is any IO error when accessing device, make our filesystem
  98          * readonly and make sure do not write checkpoint with non-uptodate
  99          * meta page.
 100          */
 101         if (unlikely(!PageUptodate(page)))
 102                 f2fs_stop_checkpoint(sbi, false);
 103 out:
 104         return page;
 105 }
 106
 107 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 108 {
 109         return __get_meta_page(sbi, index, true);
 110 }
 111
 112 /* for POR only */
 113 struct page *get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 114 {
 115         return __get_meta_page(sbi, index, false);
 116 }
 117
 118 bool is_valid_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type)
 119 {
 120         switch (type) {
 121         case META_NAT:
 122                 break;
 123         case META_SIT:
 124                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 125                         return false;
 126                 break;
 127         case META_SSA:
 128                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 129                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 130                         return false;
 131                 break;
 132         case META_CP:
 133                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 134                         blkaddr < __start_cp_addr(sbi)))
 135                         return false;
 136                 break;
 137         case META_POR:
 138                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 139                         blkaddr < MAIN_BLKADDR(sbi)))
 140                         return false;
 141                 break;
 142         default:
 143                 BUG();
 144         }
 145
 146         return true;
 147 }
 148
 149 /*
 150  * Readahead CP/NAT/SIT/SSA pages
 151  */
 152 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 153                                                         int type, bool sync)
 154 {
 155         struct page *page;
 156         block_t blkno = start;
 157         struct f2fs_io_info fio = {
 158                 .sbi = sbi,
 159                 .type = META,
 160                 .rw = sync ? (READ_SYNC | REQ_META | REQ_PRIO) : READA,
 161                 .encrypted_page = NULL,
 162         };
 163         struct blk_plug plug;
 164
 165         if (unlikely(type == META_POR))
 166                 fio.rw &= ~REQ_META;
 167
 168         blk_start_plug(&plug);
 169         for (; nrpages-- > 0; blkno++) {
 170
 171                 if (!is_valid_blkaddr(sbi, blkno, type))
 172                         goto out;
 173
 174                 switch (type) {
 175                 case META_NAT:
 176                         if (unlikely(blkno >=
 177                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 178                                 blkno = 0;
 179                         /* get nat block addr */
 180                         fio.new_blkaddr = current_nat_addr(sbi,
 181                                         blkno * NAT_ENTRY_PER_BLOCK);
 182                         break;
 183                 case META_SIT:
 184                         /* get sit block addr */
 185                         fio.new_blkaddr = current_sit_addr(sbi,
 186                                         blkno * SIT_ENTRY_PER_BLOCK);
 187                         break;
 188                 case META_SSA:
 189                 case META_CP:
 190                 case META_POR:
 191                         fio.new_blkaddr = blkno;
 192                         break;
 193                 default:
 194                         BUG();
 195                 }
 196
 197                 page = f2fs_grab_cache_page(META_MAPPING(sbi),
 198                                                 fio.new_blkaddr, false);
 199                 if (!page)
 200                         continue;
 201                 if (PageUptodate(page)) {
 202                         f2fs_put_page(page, 1);
 203                         continue;
 204                 }
 205
 206                 fio.page = page;
 207                 fio.old_blkaddr = fio.new_blkaddr;
 208                 f2fs_submit_page_mbio(&fio);
 209                 f2fs_put_page(page, 0);
 210         }
 211 out:
 212         f2fs_submit_merged_bio(sbi, META, READ);
 213         blk_finish_plug(&plug);
 214         return blkno - start;
 215 }
 216
 217 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 218 {
 219         struct page *page;
 220         bool readahead = false;
 221
 222         page = find_get_page(META_MAPPING(sbi), index);
 223         if (!page || !PageUptodate(page))
 224                 readahead = true;
 225         f2fs_put_page(page, 0);
 226
 227         if (readahead)
 228                 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR, true);
 229 }
 230
 231 static int f2fs_write_meta_page(struct page *page,
 232                                 struct writeback_control *wbc)
 233 {
 234         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 235
 236         trace_f2fs_writepage(page, META);
 237
 238         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 239                 goto redirty_out;
 240         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 241                 goto redirty_out;
 242         if (unlikely(f2fs_cp_error(sbi)))
 243                 goto redirty_out;
 244
 245         write_meta_page(sbi, page);
 246         dec_page_count(sbi, F2FS_DIRTY_META);
 247
 248         if (wbc->for_reclaim)
 249                 f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, META, WRITE);
 250
 251         unlock_page(page);
 252
 253         if (unlikely(f2fs_cp_error(sbi)))
 254                 f2fs_submit_merged_bio(sbi, META, WRITE);
 255
 256         return 0;
 257
 258 redirty_out:
 259         redirty_page_for_writepage(wbc, page);
 260         return AOP_WRITEPAGE_ACTIVATE;
 261 }
 262
 263 static int f2fs_write_meta_pages(struct address_space *mapping,
 264                                 struct writeback_control *wbc)
 265 {
 266         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 267         long diff, written;
 268
 269         /* collect a number of dirty meta pages and write together */
 270         if (wbc->for_kupdate ||
 271                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 272                 goto skip_write;
 273
 274         trace_f2fs_writepages(mapping->host, wbc, META);
 275
 276         /* if mounting is failed, skip writing node pages */
 277         mutex_lock(&sbi->cp_mutex);
 278         diff = nr_pages_to_write(sbi, META, wbc);
 279         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 280         mutex_unlock(&sbi->cp_mutex);
 281         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 282         return 0;
 283
 284 skip_write:
 285         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 286         trace_f2fs_writepages(mapping->host, wbc, META);
 287         return 0;
 288 }
 289
 290 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 291                                                 long nr_to_write)
 292 {
 293         struct address_space *mapping = META_MAPPING(sbi);
 294         pgoff_t index = 0, end = ULONG_MAX, prev = ULONG_MAX;
 295         struct pagevec pvec;
 296         long nwritten = 0;
 297         struct writeback_control wbc = {
 298                 .for_reclaim = 0,
 299         };
 300         struct blk_plug plug;
 301
 302         pagevec_init(&pvec, 0);
 303
 304         blk_start_plug(&plug);
 305
 306         while (index <= end) {
 307                 int i, nr_pages;
 308                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 309                                 PAGECACHE_TAG_DIRTY,
 310                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 311                 if (unlikely(nr_pages == 0))
 312                         break;
 313
 314                 for (i = 0; i < nr_pages; i++) {
 315                         struct page *page = pvec.pages[i];
 316
 317                         if (prev == ULONG_MAX)
 318                                 prev = page->index - 1;
 319                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 320                                 pagevec_release(&pvec);
 321                                 goto stop;
 322                         }
 323
 324                         lock_page(page);
 325
 326                         if (unlikely(page->mapping != mapping)) {
 327 continue_unlock:
 328                                 unlock_page(page);
 329                                 continue;
 330                         }
 331                         if (!PageDirty(page)) {
 332                                 /* someone wrote it for us */
 333                                 goto continue_unlock;
 334                         }
 335
 336                         f2fs_wait_on_page_writeback(page, META, true);
 337
 338                         BUG_ON(PageWriteback(page));
 339                         if (!clear_page_dirty_for_io(page))
 340                                 goto continue_unlock;
 341
 342                         if (mapping->a_ops->writepage(page, &wbc)) {
 343                                 unlock_page(page);
 344                                 break;
 345                         }
 346                         nwritten++;
 347                         prev = page->index;
 348                         if (unlikely(nwritten >= nr_to_write))
 349                                 break;
 350                 }
 351                 pagevec_release(&pvec);
 352                 cond_resched();
 353         }
 354 stop:
 355         if (nwritten)
 356                 f2fs_submit_merged_bio(sbi, type, WRITE);
 357
 358         blk_finish_plug(&plug);
 359
 360         return nwritten;
 361 }
 362
 363 static int f2fs_set_meta_page_dirty(struct page *page)
 364 {
 365         trace_f2fs_set_page_dirty(page, META);
 366
 367         SetPageUptodate(page);
 368         if (!PageDirty(page)) {
 369                 __set_page_dirty_nobuffers(page);
 370                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 371                 SetPagePrivate(page);
 372                 f2fs_trace_pid(page);
 373                 return 1;
 374         }
 375         return 0;
 376 }
 377
 378 const struct address_space_operations f2fs_meta_aops = {
 379         .writepage      = f2fs_write_meta_page,
 380         .writepages     = f2fs_write_meta_pages,
 381         .set_page_dirty = f2fs_set_meta_page_dirty,
 382         .invalidatepage = f2fs_invalidate_page,
 383         .releasepage    = f2fs_release_page,
 384 };
 385
 386 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 387 {
 388         struct inode_management *im = &sbi->im[type];
 389         struct ino_entry *e, *tmp;
 390
 391         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 392 retry:
 393         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 394
 395         spin_lock(&im->ino_lock);
 396         e = radix_tree_lookup(&im->ino_root, ino);
 397         if (!e) {
 398                 e = tmp;
 399                 if (radix_tree_insert(&im->ino_root, ino, e)) {
 400                         spin_unlock(&im->ino_lock);
 401                         radix_tree_preload_end();
 402                         goto retry;
 403                 }
 404                 memset(e, 0, sizeof(struct ino_entry));
 405                 e->ino = ino;
 406
 407                 list_add_tail(&e->list, &im->ino_list);
 408                 if (type != ORPHAN_INO)
 409                         im->ino_num++;
 410         }
 411         spin_unlock(&im->ino_lock);
 412         radix_tree_preload_end();
 413
 414         if (e != tmp)
 415                 kmem_cache_free(ino_entry_slab, tmp);
 416 }
 417
 418 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 419 {
 420         struct inode_management *im = &sbi->im[type];
 421         struct ino_entry *e;
 422
 423         spin_lock(&im->ino_lock);
 424         e = radix_tree_lookup(&im->ino_root, ino);
 425         if (e) {
 426                 list_del(&e->list);
 427                 radix_tree_delete(&im->ino_root, ino);
 428                 im->ino_num--;
 429                 spin_unlock(&im->ino_lock);
 430                 kmem_cache_free(ino_entry_slab, e);
 431                 return;
 432         }
 433         spin_unlock(&im->ino_lock);
 434 }
 435
 436 void add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 437 {
 438         /* add new dirty ino entry into list */
 439         __add_ino_entry(sbi, ino, type);
 440 }
 441
 442 void remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 443 {
 444         /* remove dirty ino entry from list */
 445         __remove_ino_entry(sbi, ino, type);
 446 }
 447
 448 /* mode should be APPEND_INO or UPDATE_INO */
 449 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 450 {
 451         struct inode_management *im = &sbi->im[mode];
 452         struct ino_entry *e;
 453
 454         spin_lock(&im->ino_lock);
 455         e = radix_tree_lookup(&im->ino_root, ino);
 456         spin_unlock(&im->ino_lock);
 457         return e ? true : false;
 458 }
 459
 460 void release_ino_entry(struct f2fs_sb_info *sbi, bool all)
 461 {
 462         struct ino_entry *e, *tmp;
 463         int i;
 464
 465         for (i = all ? ORPHAN_INO: APPEND_INO; i <= UPDATE_INO; i++) {
 466                 struct inode_management *im = &sbi->im[i];
 467
 468                 spin_lock(&im->ino_lock);
 469                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 470                         list_del(&e->list);
 471                         radix_tree_delete(&im->ino_root, e->ino);
 472                         kmem_cache_free(ino_entry_slab, e);
 473                         im->ino_num--;
 474                 }
 475                 spin_unlock(&im->ino_lock);
 476         }
 477 }
 478
 479 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 480 {
 481         struct inode_management *im = &sbi->im[ORPHAN_INO];
 482         int err = 0;
 483
 484         spin_lock(&im->ino_lock);
 485
 486 #ifdef CONFIG_F2FS_FAULT_INJECTION
 487         if (time_to_inject(FAULT_ORPHAN)) {
 488                 spin_unlock(&im->ino_lock);
 489                 return -ENOSPC;
 490         }
 491 #endif
 492         if (unlikely(im->ino_num >= sbi->max_orphans))
 493                 err = -ENOSPC;
 494         else
 495                 im->ino_num++;
 496         spin_unlock(&im->ino_lock);
 497
 498         return err;
 499 }
 500
 501 void release_orphan_inode(struct f2fs_sb_info *sbi)
 502 {
 503         struct inode_management *im = &sbi->im[ORPHAN_INO];
 504
 505         spin_lock(&im->ino_lock);
 506         f2fs_bug_on(sbi, im->ino_num == 0);
 507         im->ino_num--;
 508         spin_unlock(&im->ino_lock);
 509 }
 510
 511 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 512 {
 513         /* add new orphan ino entry into list */
 514         __add_ino_entry(sbi, ino, ORPHAN_INO);
 515 }
 516
 517 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 518 {
 519         /* remove orphan entry from orphan list */
 520         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 521 }
 522
 523 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 524 {
 525         struct inode *inode;
 526
 527         inode = f2fs_iget(sbi->sb, ino);
 528         if (IS_ERR(inode)) {
 529                 /*
 530                  * there should be a bug that we can't find the entry
 531                  * to orphan inode.
 532                  */
 533                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 534                 return PTR_ERR(inode);
 535         }
 536
 537         clear_nlink(inode);
 538         mark_inode_dirty_sync(inode);
 539
 540         /* truncate all the data during iput */
 541         iput(inode);
 542         return 0;
 543 }
 544
 545 int recover_orphan_inodes(struct f2fs_sb_info *sbi)
 546 {
 547         block_t start_blk, orphan_blocks, i, j;
 548         int err;
 549
 550         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
 551                 return 0;
 552
 553         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 554         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 555
 556         ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 557
 558         for (i = 0; i < orphan_blocks; i++) {
 559                 struct page *page = get_meta_page(sbi, start_blk + i);
 560                 struct f2fs_orphan_block *orphan_blk;
 561
 562                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 563                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 564                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 565                         err = recover_orphan_inode(sbi, ino);
 566                         if (err) {
 567                                 f2fs_put_page(page, 1);
 568                                 return err;
 569                         }
 570                 }
 571                 f2fs_put_page(page, 1);
 572         }
 573         /* clear Orphan Flag */
 574         clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
 575         return 0;
 576 }
 577
 578 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 579 {
 580         struct list_head *head;
 581         struct f2fs_orphan_block *orphan_blk = NULL;
 582         unsigned int nentries = 0;
 583         unsigned short index = 1;
 584         unsigned short orphan_blocks;
 585         struct page *page = NULL;
 586         struct ino_entry *orphan = NULL;
 587         struct inode_management *im = &sbi->im[ORPHAN_INO];
 588
 589         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 590
 591         /*
 592          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 593          * orphan inode operations are covered under f2fs_lock_op().
 594          * And, spin_lock should be avoided due to page operations below.
 595          */
 596         head = &im->ino_list;
 597
 598         /* loop for each orphan inode entry and write them in Jornal block */
 599         list_for_each_entry(orphan, head, list) {
 600                 if (!page) {
 601                         page = grab_meta_page(sbi, start_blk++);
 602                         orphan_blk =
 603                                 (struct f2fs_orphan_block *)page_address(page);
 604                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 605                 }
 606
 607                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 608
 609                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 610                         /*
 611                          * an orphan block is full of 1020 entries,
 612                          * then we need to flush current orphan blocks
 613                          * and bring another one in memory
 614                          */
 615                         orphan_blk->blk_addr = cpu_to_le16(index);
 616                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 617                         orphan_blk->entry_count = cpu_to_le32(nentries);
 618                         set_page_dirty(page);
 619                         f2fs_put_page(page, 1);
 620                         index++;
 621                         nentries = 0;
 622                         page = NULL;
 623                 }
 624         }
 625
 626         if (page) {
 627                 orphan_blk->blk_addr = cpu_to_le16(index);
 628                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 629                 orphan_blk->entry_count = cpu_to_le32(nentries);
 630                 set_page_dirty(page);
 631                 f2fs_put_page(page, 1);
 632         }
 633 }
 634
 635 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 636                                 block_t cp_addr, unsigned long long *version)
 637 {
 638         struct page *cp_page_1, *cp_page_2 = NULL;
 639         unsigned long blk_size = sbi->blocksize;
 640         struct f2fs_checkpoint *cp_block;
 641         unsigned long long cur_version = 0, pre_version = 0;
 642         size_t crc_offset;
 643         __u32 crc = 0;
 644
 645         /* Read the 1st cp block in this CP pack */
 646         cp_page_1 = get_meta_page(sbi, cp_addr);
 647
 648         /* get the version number */
 649         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
 650         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 651         if (crc_offset >= blk_size)
 652                 goto invalid_cp1;
 653
 654         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 655         if (!f2fs_crc_valid(sbi, crc, cp_block, crc_offset))
 656                 goto invalid_cp1;
 657
 658         pre_version = cur_cp_version(cp_block);
 659
 660         /* Read the 2nd cp block in this CP pack */
 661         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 662         cp_page_2 = get_meta_page(sbi, cp_addr);
 663
 664         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
 665         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 666         if (crc_offset >= blk_size)
 667                 goto invalid_cp2;
 668
 669         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 670         if (!f2fs_crc_valid(sbi, crc, cp_block, crc_offset))
 671                 goto invalid_cp2;
 672
 673         cur_version = cur_cp_version(cp_block);
 674
 675         if (cur_version == pre_version) {
 676                 *version = cur_version;
 677                 f2fs_put_page(cp_page_2, 1);
 678                 return cp_page_1;
 679         }
 680 invalid_cp2:
 681         f2fs_put_page(cp_page_2, 1);
 682 invalid_cp1:
 683         f2fs_put_page(cp_page_1, 1);
 684         return NULL;
 685 }
 686
 687 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 688 {
 689         struct f2fs_checkpoint *cp_block;
 690         struct f2fs_super_block *fsb = sbi->raw_super;
 691         struct page *cp1, *cp2, *cur_page;
 692         unsigned long blk_size = sbi->blocksize;
 693         unsigned long long cp1_version = 0, cp2_version = 0;
 694         unsigned long long cp_start_blk_no;
 695         unsigned int cp_blks = 1 + __cp_payload(sbi);
 696         block_t cp_blk_no;
 697         int i;
 698
 699         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 700         if (!sbi->ckpt)
 701                 return -ENOMEM;
 702         /*
 703          * Finding out valid cp block involves read both
 704          * sets( cp pack1 and cp pack 2)
 705          */
 706         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 707         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 708
 709         /* The second checkpoint pack should start at the next segment */
 710         cp_start_blk_no += ((unsigned long long)1) <<
 711                                 le32_to_cpu(fsb->log_blocks_per_seg);
 712         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 713
 714         if (cp1 && cp2) {
 715                 if (ver_after(cp2_version, cp1_version))
 716                         cur_page = cp2;
 717                 else
 718                         cur_page = cp1;
 719         } else if (cp1) {
 720                 cur_page = cp1;
 721         } else if (cp2) {
 722                 cur_page = cp2;
 723         } else {
 724                 goto fail_no_cp;
 725         }
 726
 727         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 728         memcpy(sbi->ckpt, cp_block, blk_size);
 729
 730         /* Sanity checking of checkpoint */
 731         if (sanity_check_ckpt(sbi))
 732                 goto fail_no_cp;
 733
 734         if (cp_blks <= 1)
 735                 goto done;
 736
 737         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 738         if (cur_page == cp2)
 739                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 740
 741         for (i = 1; i < cp_blks; i++) {
 742                 void *sit_bitmap_ptr;
 743                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 744
 745                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 746                 sit_bitmap_ptr = page_address(cur_page);
 747                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 748                 f2fs_put_page(cur_page, 1);
 749         }
 750 done:
 751         f2fs_put_page(cp1, 1);
 752         f2fs_put_page(cp2, 1);
 753         return 0;
 754
 755 fail_no_cp:
 756         kfree(sbi->ckpt);
 757         return -EINVAL;
 758 }
 759
 760 static void __add_dirty_inode(struct inode *inode, enum inode_type type)
 761 {
 762         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 763         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 764
 765         if (is_inode_flag_set(inode, flag))
 766                 return;
 767
 768         set_inode_flag(inode, flag);
 769         list_add_tail(&F2FS_I(inode)->dirty_list, &sbi->inode_list[type]);
 770         stat_inc_dirty_inode(sbi, type);
 771 }
 772
 773 static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
 774 {
 775         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 776
 777         if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
 778                 return;
 779
 780         list_del_init(&F2FS_I(inode)->dirty_list);
 781         clear_inode_flag(inode, flag);
 782         stat_dec_dirty_inode(F2FS_I_SB(inode), type);
 783 }
 784
 785 void update_dirty_page(struct inode *inode, struct page *page)
 786 {
 787         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 788         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 789
 790         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 791                         !S_ISLNK(inode->i_mode))
 792                 return;
 793
 794         spin_lock(&sbi->inode_lock[type]);
 795         if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
 796                 __add_dirty_inode(inode, type);
 797         inode_inc_dirty_pages(inode);
 798         spin_unlock(&sbi->inode_lock[type]);
 799
 800         SetPagePrivate(page);
 801         f2fs_trace_pid(page);
 802 }
 803
 804 void remove_dirty_inode(struct inode *inode)
 805 {
 806         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 807         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 808
 809         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 810                         !S_ISLNK(inode->i_mode))
 811                 return;
 812
 813         if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
 814                 return;
 815
 816         spin_lock(&sbi->inode_lock[type]);
 817         __remove_dirty_inode(inode, type);
 818         spin_unlock(&sbi->inode_lock[type]);
 819 }
 820
 821 int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
 822 {
 823         struct list_head *head;
 824         struct inode *inode;
 825         struct f2fs_inode_info *fi;
 826         bool is_dir = (type == DIR_INODE);
 827
 828         trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
 829                                 get_pages(sbi, is_dir ?
 830                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 831 retry:
 832         if (unlikely(f2fs_cp_error(sbi)))
 833                 return -EIO;
 834
 835         spin_lock(&sbi->inode_lock[type]);
 836
 837         head = &sbi->inode_list[type];
 838         if (list_empty(head)) {
 839                 spin_unlock(&sbi->inode_lock[type]);
 840                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
 841                                 get_pages(sbi, is_dir ?
 842                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 843                 return 0;
 844         }
 845         fi = list_entry(head->next, struct f2fs_inode_info, dirty_list);
 846         inode = igrab(&fi->vfs_inode);
 847         spin_unlock(&sbi->inode_lock[type]);
 848         if (inode) {
 849                 filemap_fdatawrite(inode->i_mapping);
 850                 iput(inode);
 851         } else {
 852                 /*
 853                  * We should submit bio, since it exists several
 854                  * wribacking dentry pages in the freeing inode.
 855                  */
 856                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 857                 cond_resched();
 858         }
 859         goto retry;
 860 }
 861
 862 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
 863 {
 864         struct list_head *head = &sbi->inode_list[DIRTY_META];
 865         struct inode *inode;
 866         struct f2fs_inode_info *fi;
 867         s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
 868
 869         while (total--) {
 870                 if (unlikely(f2fs_cp_error(sbi)))
 871                         return -EIO;
 872
 873                 spin_lock(&sbi->inode_lock[DIRTY_META]);
 874                 if (list_empty(head)) {
 875                         spin_unlock(&sbi->inode_lock[DIRTY_META]);
 876                         return 0;
 877                 }
 878                 fi = list_entry(head->next, struct f2fs_inode_info,
 879                                                         gdirty_list);
 880                 inode = igrab(&fi->vfs_inode);
 881                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
 882                 if (inode) {
 883                         update_inode_page(inode);
 884                         iput(inode);
 885                 }
 886         };
 887         return 0;
 888 }
 889
 890 /*
 891  * Freeze all the FS-operations for checkpoint.
 892  */
 893 static int block_operations(struct f2fs_sb_info *sbi)
 894 {
 895         struct writeback_control wbc = {
 896                 .sync_mode = WB_SYNC_ALL,
 897                 .nr_to_write = LONG_MAX,
 898                 .for_reclaim = 0,
 899         };
 900         int err = 0;
 901
 902 retry_flush_dents:
 903         f2fs_lock_all(sbi);
 904         /* write all the dirty dentry pages */
 905         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 906                 f2fs_unlock_all(sbi);
 907                 err = sync_dirty_inodes(sbi, DIR_INODE);
 908                 if (err)
 909                         goto out;
 910                 goto retry_flush_dents;
 911         }
 912
 913         if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
 914                 f2fs_unlock_all(sbi);
 915                 err = f2fs_sync_inode_meta(sbi);
 916                 if (err)
 917                         goto out;
 918                 goto retry_flush_dents;
 919         }
 920
 921         /*
 922          * POR: we should ensure that there are no dirty node pages
 923          * until finishing nat/sit flush.
 924          */
 925 retry_flush_nodes:
 926         down_write(&sbi->node_write);
 927
 928         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
 929                 up_write(&sbi->node_write);
 930                 err = sync_node_pages(sbi, &wbc);
 931                 if (err) {
 932                         f2fs_unlock_all(sbi);
 933                         goto out;
 934                 }
 935                 goto retry_flush_nodes;
 936         }
 937 out:
 938         return err;
 939 }
 940
 941 static void unblock_operations(struct f2fs_sb_info *sbi)
 942 {
 943         up_write(&sbi->node_write);
 944         f2fs_unlock_all(sbi);
 945 }
 946
 947 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
 948 {
 949         DEFINE_WAIT(wait);
 950
 951         for (;;) {
 952                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
 953
 954                 if (!atomic_read(&sbi->nr_wb_bios))
 955                         break;
 956
 957                 io_schedule_timeout(5*HZ);
 958         }
 959         finish_wait(&sbi->cp_wait, &wait);
 960 }
 961
 962 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 963 {
 964         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 965         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 966         struct f2fs_nm_info *nm_i = NM_I(sbi);
 967         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
 968         nid_t last_nid = nm_i->next_scan_nid;
 969         block_t start_blk;
 970         unsigned int data_sum_blocks, orphan_blocks;
 971         __u32 crc32 = 0;
 972         int i;
 973         int cp_payload_blks = __cp_payload(sbi);
 974         block_t discard_blk = NEXT_FREE_BLKADDR(sbi, curseg);
 975         bool invalidate = false;
 976         struct super_block *sb = sbi->sb;
 977         struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
 978         u64 kbytes_written;
 979
 980         /*
 981          * This avoids to conduct wrong roll-forward operations and uses
 982          * metapages, so should be called prior to sync_meta_pages below.
 983          */
 984         if (!test_opt(sbi, LFS) && discard_next_dnode(sbi, discard_blk))
 985                 invalidate = true;
 986
 987         /* Flush all the NAT/SIT pages */
 988         while (get_pages(sbi, F2FS_DIRTY_META)) {
 989                 sync_meta_pages(sbi, META, LONG_MAX);
 990                 if (unlikely(f2fs_cp_error(sbi)))
 991                         return -EIO;
 992         }
 993
 994         next_free_nid(sbi, &last_nid);
 995
 996         /*
 997          * modify checkpoint
 998          * version number is already updated
 999          */
1000         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
1001         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
1002         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
1003         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
1004                 ckpt->cur_node_segno[i] =
1005                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
1006                 ckpt->cur_node_blkoff[i] =
1007                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
1008                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
1009                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
1010         }
1011         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
1012                 ckpt->cur_data_segno[i] =
1013                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
1014                 ckpt->cur_data_blkoff[i] =
1015                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
1016                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
1017                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
1018         }
1019
1020         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
1021         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
1022         ckpt->next_free_nid = cpu_to_le32(last_nid);
1023
1024         /* 2 cp  + n data seg summary + orphan inode blocks */
1025         data_sum_blocks = npages_for_summary_flush(sbi, false);
1026         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
1027                 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1028         else
1029                 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1030
1031         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
1032         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
1033                         orphan_blocks);
1034
1035         if (__remain_node_summaries(cpc->reason))
1036                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
1037                                 cp_payload_blks + data_sum_blocks +
1038                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
1039         else
1040                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1041                                 cp_payload_blks + data_sum_blocks +
1042                                 orphan_blocks);
1043
1044         if (cpc->reason == CP_UMOUNT)
1045                 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1046         else
1047                 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1048
1049         if (cpc->reason == CP_FASTBOOT)
1050                 set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1051         else
1052                 clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1053
1054         if (orphan_num)
1055                 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1056         else
1057                 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1058
1059         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1060                 set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1061
1062         /* update SIT/NAT bitmap */
1063         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1064         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1065
1066         crc32 = f2fs_crc32(sbi, ckpt, le32_to_cpu(ckpt->checksum_offset));
1067         *((__le32 *)((unsigned char *)ckpt +
1068                                 le32_to_cpu(ckpt->checksum_offset)))
1069                                 = cpu_to_le32(crc32);
1070
1071         start_blk = __start_cp_addr(sbi);
1072
1073         /* need to wait for end_io results */
1074         wait_on_all_pages_writeback(sbi);
1075         if (unlikely(f2fs_cp_error(sbi)))
1076                 return -EIO;
1077
1078         /* write out checkpoint buffer at block 0 */
1079         update_meta_page(sbi, ckpt, start_blk++);
1080
1081         for (i = 1; i < 1 + cp_payload_blks; i++)
1082                 update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1083                                                         start_blk++);
1084
1085         if (orphan_num) {
1086                 write_orphan_inodes(sbi, start_blk);
1087                 start_blk += orphan_blocks;
1088         }
1089
1090         write_data_summaries(sbi, start_blk);
1091         start_blk += data_sum_blocks;
1092
1093         /* Record write statistics in the hot node summary */
1094         kbytes_written = sbi->kbytes_written;
1095         if (sb->s_bdev->bd_part)
1096                 kbytes_written += BD_PART_WRITTEN(sbi);
1097
1098         seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
1099
1100         if (__remain_node_summaries(cpc->reason)) {
1101                 write_node_summaries(sbi, start_blk);
1102                 start_blk += NR_CURSEG_NODE_TYPE;
1103         }
1104
1105         /* writeout checkpoint block */
1106         update_meta_page(sbi, ckpt, start_blk);
1107
1108         /* wait for previous submitted node/meta pages writeback */
1109         wait_on_all_pages_writeback(sbi);
1110
1111         if (unlikely(f2fs_cp_error(sbi)))
1112                 return -EIO;
1113
1114         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LLONG_MAX);
1115         filemap_fdatawait_range(META_MAPPING(sbi), 0, LLONG_MAX);
1116
1117         /* update user_block_counts */
1118         sbi->last_valid_block_count = sbi->total_valid_block_count;
1119         percpu_counter_set(&sbi->alloc_valid_block_count, 0);
1120
1121         /* Here, we only have one bio having CP pack */
1122         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
1123
1124         /* wait for previous submitted meta pages writeback */
1125         wait_on_all_pages_writeback(sbi);
1126
1127         /*
1128          * invalidate meta page which is used temporarily for zeroing out
1129          * block at the end of warm node chain.
1130          */
1131         if (invalidate)
1132                 invalidate_mapping_pages(META_MAPPING(sbi), discard_blk,
1133                                                                 discard_blk);
1134
1135         release_ino_entry(sbi, false);
1136
1137         if (unlikely(f2fs_cp_error(sbi)))
1138                 return -EIO;
1139
1140         clear_prefree_segments(sbi, cpc);
1141         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1142
1143         return 0;
1144 }
1145
1146 /*
1147  * We guarantee that this checkpoint procedure will not fail.
1148  */
1149 int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1150 {
1151         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1152         unsigned long long ckpt_ver;
1153         int err = 0;
1154
1155         mutex_lock(&sbi->cp_mutex);
1156
1157         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1158                 (cpc->reason == CP_FASTBOOT || cpc->reason == CP_SYNC ||
1159                 (cpc->reason == CP_DISCARD && !sbi->discard_blks)))
1160                 goto out;
1161         if (unlikely(f2fs_cp_error(sbi))) {
1162                 err = -EIO;
1163                 goto out;
1164         }
1165         if (f2fs_readonly(sbi->sb)) {
1166                 err = -EROFS;
1167                 goto out;
1168         }
1169
1170         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1171
1172         err = block_operations(sbi);
1173         if (err)
1174                 goto out;
1175
1176         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1177
1178         f2fs_flush_merged_bios(sbi);
1179
1180         /*
1181          * update checkpoint pack index
1182          * Increase the version number so that
1183          * SIT entries and seg summaries are written at correct place
1184          */
1185         ckpt_ver = cur_cp_version(ckpt);
1186         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1187
1188         /* write cached NAT/SIT entries to NAT/SIT area */
1189         flush_nat_entries(sbi);
1190         flush_sit_entries(sbi, cpc);
1191
1192         /* unlock all the fs_lock[] in do_checkpoint() */
1193         err = do_checkpoint(sbi, cpc);
1194
1195         unblock_operations(sbi);
1196         stat_inc_cp_count(sbi->stat_info);
1197
1198         if (cpc->reason == CP_RECOVERY)
1199                 f2fs_msg(sbi->sb, KERN_NOTICE,
1200                         "checkpoint: version = %llx", ckpt_ver);
1201
1202         /* do checkpoint periodically */
1203         f2fs_update_time(sbi, CP_TIME);
1204         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1205 out:
1206         mutex_unlock(&sbi->cp_mutex);
1207         return err;
1208 }
1209
1210 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1211 {
1212         int i;
1213
1214         for (i = 0; i < MAX_INO_ENTRY; i++) {
1215                 struct inode_management *im = &sbi->im[i];
1216
1217                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1218                 spin_lock_init(&im->ino_lock);
1219                 INIT_LIST_HEAD(&im->ino_list);
1220                 im->ino_num = 0;
1221         }
1222
1223         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1224                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1225                                 F2FS_ORPHANS_PER_BLOCK;
1226 }
1227
1228 int __init create_checkpoint_caches(void)
1229 {
1230         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1231                         sizeof(struct ino_entry));
1232         if (!ino_entry_slab)
1233                 return -ENOMEM;
1234         inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1235                         sizeof(struct inode_entry));
1236         if (!inode_entry_slab) {
1237                 kmem_cache_destroy(ino_entry_slab);
1238                 return -ENOMEM;
1239         }
1240         return 0;
1241 }
1242
1243 void destroy_checkpoint_caches(void)
1244 {
1245         kmem_cache_destroy(ino_entry_slab);
1246         kmem_cache_destroy(inode_entry_slab);
1247 }