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         if (!PageUptodate(page))
  52                 SetPageUptodate(page);
  53         return page;
  54 }
  55
  56 /*
  57  * We guarantee no failure on the returned page.
  58  */
  59 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
  60                                                         bool is_meta)
  61 {
  62         struct address_space *mapping = META_MAPPING(sbi);
  63         struct page *page;
  64         struct f2fs_io_info fio = {
  65                 .sbi = sbi,
  66                 .type = META,
  67                 .op = REQ_OP_READ,
  68                 .op_flags = READ_SYNC | REQ_META | REQ_PRIO,
  69                 .old_blkaddr = index,
  70                 .new_blkaddr = index,
  71                 .encrypted_page = NULL,
  72         };
  73
  74         if (unlikely(!is_meta))
  75                 fio.op_flags &= ~REQ_META;
  76 repeat:
  77         page = f2fs_grab_cache_page(mapping, index, false);
  78         if (!page) {
  79                 cond_resched();
  80                 goto repeat;
  81         }
  82         if (PageUptodate(page))
  83                 goto out;
  84
  85         fio.page = page;
  86
  87         if (f2fs_submit_page_bio(&fio)) {
  88                 f2fs_put_page(page, 1);
  89                 goto repeat;
  90         }
  91
  92         lock_page(page);
  93         if (unlikely(page->mapping != mapping)) {
  94                 f2fs_put_page(page, 1);
  95                 goto repeat;
  96         }
  97
  98         /*
  99          * if there is any IO error when accessing device, make our filesystem
 100          * readonly and make sure do not write checkpoint with non-uptodate
 101          * meta page.
 102          */
 103         if (unlikely(!PageUptodate(page)))
 104                 f2fs_stop_checkpoint(sbi, false);
 105 out:
 106         return page;
 107 }
 108
 109 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 110 {
 111         return __get_meta_page(sbi, index, true);
 112 }
 113
 114 /* for POR only */
 115 struct page *get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 116 {
 117         return __get_meta_page(sbi, index, false);
 118 }
 119
 120 bool is_valid_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type)
 121 {
 122         switch (type) {
 123         case META_NAT:
 124                 break;
 125         case META_SIT:
 126                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 127                         return false;
 128                 break;
 129         case META_SSA:
 130                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 131                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 132                         return false;
 133                 break;
 134         case META_CP:
 135                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 136                         blkaddr < __start_cp_addr(sbi)))
 137                         return false;
 138                 break;
 139         case META_POR:
 140                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 141                         blkaddr < MAIN_BLKADDR(sbi)))
 142                         return false;
 143                 break;
 144         default:
 145                 BUG();
 146         }
 147
 148         return true;
 149 }
 150
 151 /*
 152  * Readahead CP/NAT/SIT/SSA pages
 153  */
 154 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 155                                                         int type, bool sync)
 156 {
 157         struct page *page;
 158         block_t blkno = start;
 159         struct f2fs_io_info fio = {
 160                 .sbi = sbi,
 161                 .type = META,
 162                 .op = REQ_OP_READ,
 163                 .op_flags = sync ? (READ_SYNC | REQ_META | REQ_PRIO) : REQ_RAHEAD,
 164                 .encrypted_page = NULL,
 165         };
 166         struct blk_plug plug;
 167
 168         if (unlikely(type == META_POR))
 169                 fio.op_flags &= ~REQ_META;
 170
 171         blk_start_plug(&plug);
 172         for (; nrpages-- > 0; blkno++) {
 173
 174                 if (!is_valid_blkaddr(sbi, blkno, type))
 175                         goto out;
 176
 177                 switch (type) {
 178                 case META_NAT:
 179                         if (unlikely(blkno >=
 180                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 181                                 blkno = 0;
 182                         /* get nat block addr */
 183                         fio.new_blkaddr = current_nat_addr(sbi,
 184                                         blkno * NAT_ENTRY_PER_BLOCK);
 185                         break;
 186                 case META_SIT:
 187                         /* get sit block addr */
 188                         fio.new_blkaddr = current_sit_addr(sbi,
 189                                         blkno * SIT_ENTRY_PER_BLOCK);
 190                         break;
 191                 case META_SSA:
 192                 case META_CP:
 193                 case META_POR:
 194                         fio.new_blkaddr = blkno;
 195                         break;
 196                 default:
 197                         BUG();
 198                 }
 199
 200                 page = f2fs_grab_cache_page(META_MAPPING(sbi),
 201                                                 fio.new_blkaddr, false);
 202                 if (!page)
 203                         continue;
 204                 if (PageUptodate(page)) {
 205                         f2fs_put_page(page, 1);
 206                         continue;
 207                 }
 208
 209                 fio.page = page;
 210                 fio.old_blkaddr = fio.new_blkaddr;
 211                 f2fs_submit_page_mbio(&fio);
 212                 f2fs_put_page(page, 0);
 213         }
 214 out:
 215         f2fs_submit_merged_bio(sbi, META, READ);
 216         blk_finish_plug(&plug);
 217         return blkno - start;
 218 }
 219
 220 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 221 {
 222         struct page *page;
 223         bool readahead = false;
 224
 225         page = find_get_page(META_MAPPING(sbi), index);
 226         if (!page || !PageUptodate(page))
 227                 readahead = true;
 228         f2fs_put_page(page, 0);
 229
 230         if (readahead)
 231                 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR, true);
 232 }
 233
 234 static int f2fs_write_meta_page(struct page *page,
 235                                 struct writeback_control *wbc)
 236 {
 237         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 238
 239         trace_f2fs_writepage(page, META);
 240
 241         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 242                 goto redirty_out;
 243         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 244                 goto redirty_out;
 245         if (unlikely(f2fs_cp_error(sbi)))
 246                 goto redirty_out;
 247
 248         write_meta_page(sbi, page);
 249         dec_page_count(sbi, F2FS_DIRTY_META);
 250
 251         if (wbc->for_reclaim)
 252                 f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, META, WRITE);
 253
 254         unlock_page(page);
 255
 256         if (unlikely(f2fs_cp_error(sbi)))
 257                 f2fs_submit_merged_bio(sbi, META, WRITE);
 258
 259         return 0;
 260
 261 redirty_out:
 262         redirty_page_for_writepage(wbc, page);
 263         return AOP_WRITEPAGE_ACTIVATE;
 264 }
 265
 266 static int f2fs_write_meta_pages(struct address_space *mapping,
 267                                 struct writeback_control *wbc)
 268 {
 269         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 270         struct blk_plug plug;
 271         long diff, written;
 272
 273         /* collect a number of dirty meta pages and write together */
 274         if (wbc->for_kupdate ||
 275                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 276                 goto skip_write;
 277
 278         trace_f2fs_writepages(mapping->host, wbc, META);
 279
 280         /* if mounting is failed, skip writing node pages */
 281         mutex_lock(&sbi->cp_mutex);
 282         diff = nr_pages_to_write(sbi, META, wbc);
 283         blk_start_plug(&plug);
 284         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 285         blk_finish_plug(&plug);
 286         mutex_unlock(&sbi->cp_mutex);
 287         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 288         return 0;
 289
 290 skip_write:
 291         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 292         trace_f2fs_writepages(mapping->host, wbc, META);
 293         return 0;
 294 }
 295
 296 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 297                                                 long nr_to_write)
 298 {
 299         struct address_space *mapping = META_MAPPING(sbi);
 300         pgoff_t index = 0, end = ULONG_MAX, prev = ULONG_MAX;
 301         struct pagevec pvec;
 302         long nwritten = 0;
 303         struct writeback_control wbc = {
 304                 .for_reclaim = 0,
 305         };
 306         struct blk_plug plug;
 307
 308         pagevec_init(&pvec, 0);
 309
 310         blk_start_plug(&plug);
 311
 312         while (index <= end) {
 313                 int i, nr_pages;
 314                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 315                                 PAGECACHE_TAG_DIRTY,
 316                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 317                 if (unlikely(nr_pages == 0))
 318                         break;
 319
 320                 for (i = 0; i < nr_pages; i++) {
 321                         struct page *page = pvec.pages[i];
 322
 323                         if (prev == ULONG_MAX)
 324                                 prev = page->index - 1;
 325                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 326                                 pagevec_release(&pvec);
 327                                 goto stop;
 328                         }
 329
 330                         lock_page(page);
 331
 332                         if (unlikely(page->mapping != mapping)) {
 333 continue_unlock:
 334                                 unlock_page(page);
 335                                 continue;
 336                         }
 337                         if (!PageDirty(page)) {
 338                                 /* someone wrote it for us */
 339                                 goto continue_unlock;
 340                         }
 341
 342                         f2fs_wait_on_page_writeback(page, META, true);
 343
 344                         BUG_ON(PageWriteback(page));
 345                         if (!clear_page_dirty_for_io(page))
 346                                 goto continue_unlock;
 347
 348                         if (mapping->a_ops->writepage(page, &wbc)) {
 349                                 unlock_page(page);
 350                                 break;
 351                         }
 352                         nwritten++;
 353                         prev = page->index;
 354                         if (unlikely(nwritten >= nr_to_write))
 355                                 break;
 356                 }
 357                 pagevec_release(&pvec);
 358                 cond_resched();
 359         }
 360 stop:
 361         if (nwritten)
 362                 f2fs_submit_merged_bio(sbi, type, WRITE);
 363
 364         blk_finish_plug(&plug);
 365
 366         return nwritten;
 367 }
 368
 369 static int f2fs_set_meta_page_dirty(struct page *page)
 370 {
 371         trace_f2fs_set_page_dirty(page, META);
 372
 373         if (!PageUptodate(page))
 374                 SetPageUptodate(page);
 375         if (!PageDirty(page)) {
 376                 f2fs_set_page_dirty_nobuffers(page);
 377                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 378                 SetPagePrivate(page);
 379                 f2fs_trace_pid(page);
 380                 return 1;
 381         }
 382         return 0;
 383 }
 384
 385 const struct address_space_operations f2fs_meta_aops = {
 386         .writepage      = f2fs_write_meta_page,
 387         .writepages     = f2fs_write_meta_pages,
 388         .set_page_dirty = f2fs_set_meta_page_dirty,
 389         .invalidatepage = f2fs_invalidate_page,
 390         .releasepage    = f2fs_release_page,
 391 };
 392
 393 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 394 {
 395         struct inode_management *im = &sbi->im[type];
 396         struct ino_entry *e, *tmp;
 397
 398         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 399 retry:
 400         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 401
 402         spin_lock(&im->ino_lock);
 403         e = radix_tree_lookup(&im->ino_root, ino);
 404         if (!e) {
 405                 e = tmp;
 406                 if (radix_tree_insert(&im->ino_root, ino, e)) {
 407                         spin_unlock(&im->ino_lock);
 408                         radix_tree_preload_end();
 409                         goto retry;
 410                 }
 411                 memset(e, 0, sizeof(struct ino_entry));
 412                 e->ino = ino;
 413
 414                 list_add_tail(&e->list, &im->ino_list);
 415                 if (type != ORPHAN_INO)
 416                         im->ino_num++;
 417         }
 418         spin_unlock(&im->ino_lock);
 419         radix_tree_preload_end();
 420
 421         if (e != tmp)
 422                 kmem_cache_free(ino_entry_slab, tmp);
 423 }
 424
 425 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 426 {
 427         struct inode_management *im = &sbi->im[type];
 428         struct ino_entry *e;
 429
 430         spin_lock(&im->ino_lock);
 431         e = radix_tree_lookup(&im->ino_root, ino);
 432         if (e) {
 433                 list_del(&e->list);
 434                 radix_tree_delete(&im->ino_root, ino);
 435                 im->ino_num--;
 436                 spin_unlock(&im->ino_lock);
 437                 kmem_cache_free(ino_entry_slab, e);
 438                 return;
 439         }
 440         spin_unlock(&im->ino_lock);
 441 }
 442
 443 void add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 444 {
 445         /* add new dirty ino entry into list */
 446         __add_ino_entry(sbi, ino, type);
 447 }
 448
 449 void remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 450 {
 451         /* remove dirty ino entry from list */
 452         __remove_ino_entry(sbi, ino, type);
 453 }
 454
 455 /* mode should be APPEND_INO or UPDATE_INO */
 456 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 457 {
 458         struct inode_management *im = &sbi->im[mode];
 459         struct ino_entry *e;
 460
 461         spin_lock(&im->ino_lock);
 462         e = radix_tree_lookup(&im->ino_root, ino);
 463         spin_unlock(&im->ino_lock);
 464         return e ? true : false;
 465 }
 466
 467 void release_ino_entry(struct f2fs_sb_info *sbi, bool all)
 468 {
 469         struct ino_entry *e, *tmp;
 470         int i;
 471
 472         for (i = all ? ORPHAN_INO: APPEND_INO; i <= UPDATE_INO; i++) {
 473                 struct inode_management *im = &sbi->im[i];
 474
 475                 spin_lock(&im->ino_lock);
 476                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 477                         list_del(&e->list);
 478                         radix_tree_delete(&im->ino_root, e->ino);
 479                         kmem_cache_free(ino_entry_slab, e);
 480                         im->ino_num--;
 481                 }
 482                 spin_unlock(&im->ino_lock);
 483         }
 484 }
 485
 486 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 487 {
 488         struct inode_management *im = &sbi->im[ORPHAN_INO];
 489         int err = 0;
 490
 491         spin_lock(&im->ino_lock);
 492
 493 #ifdef CONFIG_F2FS_FAULT_INJECTION
 494         if (time_to_inject(FAULT_ORPHAN)) {
 495                 spin_unlock(&im->ino_lock);
 496                 return -ENOSPC;
 497         }
 498 #endif
 499         if (unlikely(im->ino_num >= sbi->max_orphans))
 500                 err = -ENOSPC;
 501         else
 502                 im->ino_num++;
 503         spin_unlock(&im->ino_lock);
 504
 505         return err;
 506 }
 507
 508 void release_orphan_inode(struct f2fs_sb_info *sbi)
 509 {
 510         struct inode_management *im = &sbi->im[ORPHAN_INO];
 511
 512         spin_lock(&im->ino_lock);
 513         f2fs_bug_on(sbi, im->ino_num == 0);
 514         im->ino_num--;
 515         spin_unlock(&im->ino_lock);
 516 }
 517
 518 void add_orphan_inode(struct inode *inode)
 519 {
 520         /* add new orphan ino entry into list */
 521         __add_ino_entry(F2FS_I_SB(inode), inode->i_ino, ORPHAN_INO);
 522         update_inode_page(inode);
 523 }
 524
 525 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 526 {
 527         /* remove orphan entry from orphan list */
 528         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 529 }
 530
 531 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 532 {
 533         struct inode *inode;
 534
 535         inode = f2fs_iget(sbi->sb, ino);
 536         if (IS_ERR(inode)) {
 537                 /*
 538                  * there should be a bug that we can't find the entry
 539                  * to orphan inode.
 540                  */
 541                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 542                 return PTR_ERR(inode);
 543         }
 544
 545         clear_nlink(inode);
 546
 547         /* truncate all the data during iput */
 548         iput(inode);
 549         return 0;
 550 }
 551
 552 int recover_orphan_inodes(struct f2fs_sb_info *sbi)
 553 {
 554         block_t start_blk, orphan_blocks, i, j;
 555         int err;
 556
 557         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
 558                 return 0;
 559
 560         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 561         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 562
 563         ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 564
 565         for (i = 0; i < orphan_blocks; i++) {
 566                 struct page *page = get_meta_page(sbi, start_blk + i);
 567                 struct f2fs_orphan_block *orphan_blk;
 568
 569                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 570                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 571                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 572                         err = recover_orphan_inode(sbi, ino);
 573                         if (err) {
 574                                 f2fs_put_page(page, 1);
 575                                 return err;
 576                         }
 577                 }
 578                 f2fs_put_page(page, 1);
 579         }
 580         /* clear Orphan Flag */
 581         clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
 582         return 0;
 583 }
 584
 585 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 586 {
 587         struct list_head *head;
 588         struct f2fs_orphan_block *orphan_blk = NULL;
 589         unsigned int nentries = 0;
 590         unsigned short index = 1;
 591         unsigned short orphan_blocks;
 592         struct page *page = NULL;
 593         struct ino_entry *orphan = NULL;
 594         struct inode_management *im = &sbi->im[ORPHAN_INO];
 595
 596         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 597
 598         /*
 599          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 600          * orphan inode operations are covered under f2fs_lock_op().
 601          * And, spin_lock should be avoided due to page operations below.
 602          */
 603         head = &im->ino_list;
 604
 605         /* loop for each orphan inode entry and write them in Jornal block */
 606         list_for_each_entry(orphan, head, list) {
 607                 if (!page) {
 608                         page = grab_meta_page(sbi, start_blk++);
 609                         orphan_blk =
 610                                 (struct f2fs_orphan_block *)page_address(page);
 611                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 612                 }
 613
 614                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 615
 616                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 617                         /*
 618                          * an orphan block is full of 1020 entries,
 619                          * then we need to flush current orphan blocks
 620                          * and bring another one in memory
 621                          */
 622                         orphan_blk->blk_addr = cpu_to_le16(index);
 623                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 624                         orphan_blk->entry_count = cpu_to_le32(nentries);
 625                         set_page_dirty(page);
 626                         f2fs_put_page(page, 1);
 627                         index++;
 628                         nentries = 0;
 629                         page = NULL;
 630                 }
 631         }
 632
 633         if (page) {
 634                 orphan_blk->blk_addr = cpu_to_le16(index);
 635                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 636                 orphan_blk->entry_count = cpu_to_le32(nentries);
 637                 set_page_dirty(page);
 638                 f2fs_put_page(page, 1);
 639         }
 640 }
 641
 642 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 643                                 block_t cp_addr, unsigned long long *version)
 644 {
 645         struct page *cp_page_1, *cp_page_2 = NULL;
 646         unsigned long blk_size = sbi->blocksize;
 647         struct f2fs_checkpoint *cp_block;
 648         unsigned long long cur_version = 0, pre_version = 0;
 649         size_t crc_offset;
 650         __u32 crc = 0;
 651
 652         /* Read the 1st cp block in this CP pack */
 653         cp_page_1 = get_meta_page(sbi, cp_addr);
 654
 655         /* get the version number */
 656         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
 657         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 658         if (crc_offset >= blk_size)
 659                 goto invalid_cp1;
 660
 661         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 662         if (!f2fs_crc_valid(sbi, crc, cp_block, crc_offset))
 663                 goto invalid_cp1;
 664
 665         pre_version = cur_cp_version(cp_block);
 666
 667         /* Read the 2nd cp block in this CP pack */
 668         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 669         cp_page_2 = get_meta_page(sbi, cp_addr);
 670
 671         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
 672         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 673         if (crc_offset >= blk_size)
 674                 goto invalid_cp2;
 675
 676         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 677         if (!f2fs_crc_valid(sbi, crc, cp_block, crc_offset))
 678                 goto invalid_cp2;
 679
 680         cur_version = cur_cp_version(cp_block);
 681
 682         if (cur_version == pre_version) {
 683                 *version = cur_version;
 684                 f2fs_put_page(cp_page_2, 1);
 685                 return cp_page_1;
 686         }
 687 invalid_cp2:
 688         f2fs_put_page(cp_page_2, 1);
 689 invalid_cp1:
 690         f2fs_put_page(cp_page_1, 1);
 691         return NULL;
 692 }
 693
 694 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 695 {
 696         struct f2fs_checkpoint *cp_block;
 697         struct f2fs_super_block *fsb = sbi->raw_super;
 698         struct page *cp1, *cp2, *cur_page;
 699         unsigned long blk_size = sbi->blocksize;
 700         unsigned long long cp1_version = 0, cp2_version = 0;
 701         unsigned long long cp_start_blk_no;
 702         unsigned int cp_blks = 1 + __cp_payload(sbi);
 703         block_t cp_blk_no;
 704         int i;
 705
 706         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 707         if (!sbi->ckpt)
 708                 return -ENOMEM;
 709         /*
 710          * Finding out valid cp block involves read both
 711          * sets( cp pack1 and cp pack 2)
 712          */
 713         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 714         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 715
 716         /* The second checkpoint pack should start at the next segment */
 717         cp_start_blk_no += ((unsigned long long)1) <<
 718                                 le32_to_cpu(fsb->log_blocks_per_seg);
 719         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 720
 721         if (cp1 && cp2) {
 722                 if (ver_after(cp2_version, cp1_version))
 723                         cur_page = cp2;
 724                 else
 725                         cur_page = cp1;
 726         } else if (cp1) {
 727                 cur_page = cp1;
 728         } else if (cp2) {
 729                 cur_page = cp2;
 730         } else {
 731                 goto fail_no_cp;
 732         }
 733
 734         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 735         memcpy(sbi->ckpt, cp_block, blk_size);
 736
 737         /* Sanity checking of checkpoint */
 738         if (sanity_check_ckpt(sbi))
 739                 goto fail_no_cp;
 740
 741         if (cp_blks <= 1)
 742                 goto done;
 743
 744         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 745         if (cur_page == cp2)
 746                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 747
 748         for (i = 1; i < cp_blks; i++) {
 749                 void *sit_bitmap_ptr;
 750                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 751
 752                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 753                 sit_bitmap_ptr = page_address(cur_page);
 754                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 755                 f2fs_put_page(cur_page, 1);
 756         }
 757 done:
 758         f2fs_put_page(cp1, 1);
 759         f2fs_put_page(cp2, 1);
 760         return 0;
 761
 762 fail_no_cp:
 763         kfree(sbi->ckpt);
 764         return -EINVAL;
 765 }
 766
 767 static void __add_dirty_inode(struct inode *inode, enum inode_type type)
 768 {
 769         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 770         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 771
 772         if (is_inode_flag_set(inode, flag))
 773                 return;
 774
 775         set_inode_flag(inode, flag);
 776         list_add_tail(&F2FS_I(inode)->dirty_list, &sbi->inode_list[type]);
 777         stat_inc_dirty_inode(sbi, type);
 778 }
 779
 780 static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
 781 {
 782         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 783
 784         if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
 785                 return;
 786
 787         list_del_init(&F2FS_I(inode)->dirty_list);
 788         clear_inode_flag(inode, flag);
 789         stat_dec_dirty_inode(F2FS_I_SB(inode), type);
 790 }
 791
 792 void update_dirty_page(struct inode *inode, struct page *page)
 793 {
 794         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 795         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 796
 797         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 798                         !S_ISLNK(inode->i_mode))
 799                 return;
 800
 801         spin_lock(&sbi->inode_lock[type]);
 802         if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
 803                 __add_dirty_inode(inode, type);
 804         inode_inc_dirty_pages(inode);
 805         spin_unlock(&sbi->inode_lock[type]);
 806
 807         SetPagePrivate(page);
 808         f2fs_trace_pid(page);
 809 }
 810
 811 void remove_dirty_inode(struct inode *inode)
 812 {
 813         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 814         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 815
 816         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 817                         !S_ISLNK(inode->i_mode))
 818                 return;
 819
 820         if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
 821                 return;
 822
 823         spin_lock(&sbi->inode_lock[type]);
 824         __remove_dirty_inode(inode, type);
 825         spin_unlock(&sbi->inode_lock[type]);
 826 }
 827
 828 int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
 829 {
 830         struct list_head *head;
 831         struct inode *inode;
 832         struct f2fs_inode_info *fi;
 833         bool is_dir = (type == DIR_INODE);
 834
 835         trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
 836                                 get_pages(sbi, is_dir ?
 837                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 838 retry:
 839         if (unlikely(f2fs_cp_error(sbi)))
 840                 return -EIO;
 841
 842         spin_lock(&sbi->inode_lock[type]);
 843
 844         head = &sbi->inode_list[type];
 845         if (list_empty(head)) {
 846                 spin_unlock(&sbi->inode_lock[type]);
 847                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
 848                                 get_pages(sbi, is_dir ?
 849                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 850                 return 0;
 851         }
 852         fi = list_entry(head->next, struct f2fs_inode_info, dirty_list);
 853         inode = igrab(&fi->vfs_inode);
 854         spin_unlock(&sbi->inode_lock[type]);
 855         if (inode) {
 856                 filemap_fdatawrite(inode->i_mapping);
 857                 iput(inode);
 858         } else {
 859                 /*
 860                  * We should submit bio, since it exists several
 861                  * wribacking dentry pages in the freeing inode.
 862                  */
 863                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 864                 cond_resched();
 865         }
 866         goto retry;
 867 }
 868
 869 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
 870 {
 871         struct list_head *head = &sbi->inode_list[DIRTY_META];
 872         struct inode *inode;
 873         struct f2fs_inode_info *fi;
 874         s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
 875
 876         while (total--) {
 877                 if (unlikely(f2fs_cp_error(sbi)))
 878                         return -EIO;
 879
 880                 spin_lock(&sbi->inode_lock[DIRTY_META]);
 881                 if (list_empty(head)) {
 882                         spin_unlock(&sbi->inode_lock[DIRTY_META]);
 883                         return 0;
 884                 }
 885                 fi = list_entry(head->next, struct f2fs_inode_info,
 886                                                         gdirty_list);
 887                 inode = igrab(&fi->vfs_inode);
 888                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
 889                 if (inode) {
 890                         update_inode_page(inode);
 891                         iput(inode);
 892                 }
 893         };
 894         return 0;
 895 }
 896
 897 /*
 898  * Freeze all the FS-operations for checkpoint.
 899  */
 900 static int block_operations(struct f2fs_sb_info *sbi)
 901 {
 902         struct writeback_control wbc = {
 903                 .sync_mode = WB_SYNC_ALL,
 904                 .nr_to_write = LONG_MAX,
 905                 .for_reclaim = 0,
 906         };
 907         struct blk_plug plug;
 908         int err = 0;
 909
 910         blk_start_plug(&plug);
 911
 912 retry_flush_dents:
 913         f2fs_lock_all(sbi);
 914         /* write all the dirty dentry pages */
 915         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 916                 f2fs_unlock_all(sbi);
 917                 err = sync_dirty_inodes(sbi, DIR_INODE);
 918                 if (err)
 919                         goto out;
 920                 goto retry_flush_dents;
 921         }
 922
 923         if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
 924                 f2fs_unlock_all(sbi);
 925                 err = f2fs_sync_inode_meta(sbi);
 926                 if (err)
 927                         goto out;
 928                 goto retry_flush_dents;
 929         }
 930
 931         /*
 932          * POR: we should ensure that there are no dirty node pages
 933          * until finishing nat/sit flush.
 934          */
 935 retry_flush_nodes:
 936         down_write(&sbi->node_write);
 937
 938         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
 939                 up_write(&sbi->node_write);
 940                 err = sync_node_pages(sbi, &wbc);
 941                 if (err) {
 942                         f2fs_unlock_all(sbi);
 943                         goto out;
 944                 }
 945                 goto retry_flush_nodes;
 946         }
 947 out:
 948         blk_finish_plug(&plug);
 949         return err;
 950 }
 951
 952 static void unblock_operations(struct f2fs_sb_info *sbi)
 953 {
 954         up_write(&sbi->node_write);
 955
 956         build_free_nids(sbi);
 957         f2fs_unlock_all(sbi);
 958 }
 959
 960 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
 961 {
 962         DEFINE_WAIT(wait);
 963
 964         for (;;) {
 965                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
 966
 967                 if (!atomic_read(&sbi->nr_wb_bios))
 968                         break;
 969
 970                 io_schedule_timeout(5*HZ);
 971         }
 972         finish_wait(&sbi->cp_wait, &wait);
 973 }
 974
 975 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 976 {
 977         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 978         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 979         struct f2fs_nm_info *nm_i = NM_I(sbi);
 980         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
 981         nid_t last_nid = nm_i->next_scan_nid;
 982         block_t start_blk;
 983         unsigned int data_sum_blocks, orphan_blocks;
 984         __u32 crc32 = 0;
 985         int i;
 986         int cp_payload_blks = __cp_payload(sbi);
 987         block_t discard_blk = NEXT_FREE_BLKADDR(sbi, curseg);
 988         bool invalidate = false;
 989         struct super_block *sb = sbi->sb;
 990         struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
 991         u64 kbytes_written;
 992
 993         /*
 994          * This avoids to conduct wrong roll-forward operations and uses
 995          * metapages, so should be called prior to sync_meta_pages below.
 996          */
 997         if (!test_opt(sbi, LFS) && discard_next_dnode(sbi, discard_blk))
 998                 invalidate = true;
 999
1000         /* Flush all the NAT/SIT pages */
1001         while (get_pages(sbi, F2FS_DIRTY_META)) {
1002                 sync_meta_pages(sbi, META, LONG_MAX);
1003                 if (unlikely(f2fs_cp_error(sbi)))
1004                         return -EIO;
1005         }
1006
1007         next_free_nid(sbi, &last_nid);
1008
1009         /*
1010          * modify checkpoint
1011          * version number is already updated
1012          */
1013         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
1014         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
1015         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
1016         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
1017                 ckpt->cur_node_segno[i] =
1018                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
1019                 ckpt->cur_node_blkoff[i] =
1020                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
1021                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
1022                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
1023         }
1024         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
1025                 ckpt->cur_data_segno[i] =
1026                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
1027                 ckpt->cur_data_blkoff[i] =
1028                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
1029                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
1030                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
1031         }
1032
1033         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
1034         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
1035         ckpt->next_free_nid = cpu_to_le32(last_nid);
1036
1037         /* 2 cp  + n data seg summary + orphan inode blocks */
1038         data_sum_blocks = npages_for_summary_flush(sbi, false);
1039         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
1040                 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1041         else
1042                 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1043
1044         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
1045         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
1046                         orphan_blocks);
1047
1048         if (__remain_node_summaries(cpc->reason))
1049                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
1050                                 cp_payload_blks + data_sum_blocks +
1051                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
1052         else
1053                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1054                                 cp_payload_blks + data_sum_blocks +
1055                                 orphan_blocks);
1056
1057         if (cpc->reason == CP_UMOUNT)
1058                 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1059         else
1060                 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1061
1062         if (cpc->reason == CP_FASTBOOT)
1063                 set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1064         else
1065                 clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1066
1067         if (orphan_num)
1068                 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1069         else
1070                 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1071
1072         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1073                 set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1074
1075         /* update SIT/NAT bitmap */
1076         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1077         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1078
1079         crc32 = f2fs_crc32(sbi, ckpt, le32_to_cpu(ckpt->checksum_offset));
1080         *((__le32 *)((unsigned char *)ckpt +
1081                                 le32_to_cpu(ckpt->checksum_offset)))
1082                                 = cpu_to_le32(crc32);
1083
1084         start_blk = __start_cp_addr(sbi);
1085
1086         /* need to wait for end_io results */
1087         wait_on_all_pages_writeback(sbi);
1088         if (unlikely(f2fs_cp_error(sbi)))
1089                 return -EIO;
1090
1091         /* write out checkpoint buffer at block 0 */
1092         update_meta_page(sbi, ckpt, start_blk++);
1093
1094         for (i = 1; i < 1 + cp_payload_blks; i++)
1095                 update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1096                                                         start_blk++);
1097
1098         if (orphan_num) {
1099                 write_orphan_inodes(sbi, start_blk);
1100                 start_blk += orphan_blocks;
1101         }
1102
1103         write_data_summaries(sbi, start_blk);
1104         start_blk += data_sum_blocks;
1105
1106         /* Record write statistics in the hot node summary */
1107         kbytes_written = sbi->kbytes_written;
1108         if (sb->s_bdev->bd_part)
1109                 kbytes_written += BD_PART_WRITTEN(sbi);
1110
1111         seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
1112
1113         if (__remain_node_summaries(cpc->reason)) {
1114                 write_node_summaries(sbi, start_blk);
1115                 start_blk += NR_CURSEG_NODE_TYPE;
1116         }
1117
1118         /* writeout checkpoint block */
1119         update_meta_page(sbi, ckpt, start_blk);
1120
1121         /* wait for previous submitted node/meta pages writeback */
1122         wait_on_all_pages_writeback(sbi);
1123
1124         if (unlikely(f2fs_cp_error(sbi)))
1125                 return -EIO;
1126
1127         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LLONG_MAX);
1128         filemap_fdatawait_range(META_MAPPING(sbi), 0, LLONG_MAX);
1129
1130         /* update user_block_counts */
1131         sbi->last_valid_block_count = sbi->total_valid_block_count;
1132         percpu_counter_set(&sbi->alloc_valid_block_count, 0);
1133
1134         /* Here, we only have one bio having CP pack */
1135         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
1136
1137         /* wait for previous submitted meta pages writeback */
1138         wait_on_all_pages_writeback(sbi);
1139
1140         /*
1141          * invalidate meta page which is used temporarily for zeroing out
1142          * block at the end of warm node chain.
1143          */
1144         if (invalidate)
1145                 invalidate_mapping_pages(META_MAPPING(sbi), discard_blk,
1146                                                                 discard_blk);
1147
1148         release_ino_entry(sbi, false);
1149
1150         if (unlikely(f2fs_cp_error(sbi)))
1151                 return -EIO;
1152
1153         clear_prefree_segments(sbi, cpc);
1154         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1155
1156         return 0;
1157 }
1158
1159 /*
1160  * We guarantee that this checkpoint procedure will not fail.
1161  */
1162 int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1163 {
1164         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1165         unsigned long long ckpt_ver;
1166         int err = 0;
1167
1168         mutex_lock(&sbi->cp_mutex);
1169
1170         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1171                 (cpc->reason == CP_FASTBOOT || cpc->reason == CP_SYNC ||
1172                 (cpc->reason == CP_DISCARD && !sbi->discard_blks)))
1173                 goto out;
1174         if (unlikely(f2fs_cp_error(sbi))) {
1175                 err = -EIO;
1176                 goto out;
1177         }
1178         if (f2fs_readonly(sbi->sb)) {
1179                 err = -EROFS;
1180                 goto out;
1181         }
1182
1183         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1184
1185         err = block_operations(sbi);
1186         if (err)
1187                 goto out;
1188
1189         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1190
1191         f2fs_flush_merged_bios(sbi);
1192
1193         /*
1194          * update checkpoint pack index
1195          * Increase the version number so that
1196          * SIT entries and seg summaries are written at correct place
1197          */
1198         ckpt_ver = cur_cp_version(ckpt);
1199         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1200
1201         /* write cached NAT/SIT entries to NAT/SIT area */
1202         flush_nat_entries(sbi);
1203         flush_sit_entries(sbi, cpc);
1204
1205         /* unlock all the fs_lock[] in do_checkpoint() */
1206         err = do_checkpoint(sbi, cpc);
1207
1208         unblock_operations(sbi);
1209         stat_inc_cp_count(sbi->stat_info);
1210
1211         if (cpc->reason == CP_RECOVERY)
1212                 f2fs_msg(sbi->sb, KERN_NOTICE,
1213                         "checkpoint: version = %llx", ckpt_ver);
1214
1215         /* do checkpoint periodically */
1216         f2fs_update_time(sbi, CP_TIME);
1217         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1218 out:
1219         mutex_unlock(&sbi->cp_mutex);
1220         return err;
1221 }
1222
1223 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1224 {
1225         int i;
1226
1227         for (i = 0; i < MAX_INO_ENTRY; i++) {
1228                 struct inode_management *im = &sbi->im[i];
1229
1230                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1231                 spin_lock_init(&im->ino_lock);
1232                 INIT_LIST_HEAD(&im->ino_list);
1233                 im->ino_num = 0;
1234         }
1235
1236         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1237                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1238                                 F2FS_ORPHANS_PER_BLOCK;
1239 }
1240
1241 int __init create_checkpoint_caches(void)
1242 {
1243         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1244                         sizeof(struct ino_entry));
1245         if (!ino_entry_slab)
1246                 return -ENOMEM;
1247         inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1248                         sizeof(struct inode_entry));
1249         if (!inode_entry_slab) {
1250                 kmem_cache_destroy(ino_entry_slab);
1251                 return -ENOMEM;
1252         }
1253         return 0;
1254 }
1255
1256 void destroy_checkpoint_caches(void)
1257 {
1258         kmem_cache_destroy(ino_entry_slab);
1259         kmem_cache_destroy(inode_entry_slab);
1260 }