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, 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                 .is_meta = is_meta,
  73         };
  74
  75         if (unlikely(!is_meta))
  76                 fio.op_flags &= ~REQ_META;
  77 repeat:
  78         page = f2fs_grab_cache_page(mapping, index, false);
  79         if (!page) {
  80                 cond_resched();
  81                 goto repeat;
  82         }
  83         if (PageUptodate(page))
  84                 goto out;
  85
  86         fio.page = page;
  87
  88         if (f2fs_submit_page_bio(&fio)) {
  89                 memset(page_address(page), 0, PAGE_SIZE);
  90                 f2fs_stop_checkpoint(sbi, false);
  91                 f2fs_bug_on(sbi, 1);
  92                 return page;
  93         }
  94
  95         lock_page(page);
  96         if (unlikely(page->mapping != mapping)) {
  97                 f2fs_put_page(page, 1);
  98                 goto repeat;
  99         }
 100
 101         /*
 102          * if there is any IO error when accessing device, make our filesystem
 103          * readonly and make sure do not write checkpoint with non-uptodate
 104          * meta page.
 105          */
 106         if (unlikely(!PageUptodate(page)))
 107                 f2fs_stop_checkpoint(sbi, false);
 108 out:
 109         return page;
 110 }
 111
 112 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 113 {
 114         return __get_meta_page(sbi, index, true);
 115 }
 116
 117 /* for POR only */
 118 struct page *get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 119 {
 120         return __get_meta_page(sbi, index, false);
 121 }
 122
 123 bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
 124                                         block_t blkaddr, int type)
 125 {
 126         switch (type) {
 127         case META_NAT:
 128                 break;
 129         case META_SIT:
 130                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 131                         return false;
 132                 break;
 133         case META_SSA:
 134                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 135                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 136                         return false;
 137                 break;
 138         case META_CP:
 139                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 140                         blkaddr < __start_cp_addr(sbi)))
 141                         return false;
 142                 break;
 143         case META_POR:
 144         case DATA_GENERIC:
 145                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 146                         blkaddr < MAIN_BLKADDR(sbi))) {
 147                         if (type == DATA_GENERIC) {
 148                                 f2fs_msg(sbi->sb, KERN_WARNING,
 149                                         "access invalid blkaddr:%u", blkaddr);
 150                                 WARN_ON(1);
 151                         }
 152                         return false;
 153                 }
 154                 break;
 155         case META_GENERIC:
 156                 if (unlikely(blkaddr < SEG0_BLKADDR(sbi) ||
 157                         blkaddr >= MAIN_BLKADDR(sbi)))
 158                         return false;
 159                 break;
 160         default:
 161                 BUG();
 162         }
 163
 164         return true;
 165 }
 166
 167 /*
 168  * Readahead CP/NAT/SIT/SSA pages
 169  */
 170 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 171                                                         int type, bool sync)
 172 {
 173         struct page *page;
 174         block_t blkno = start;
 175         struct f2fs_io_info fio = {
 176                 .sbi = sbi,
 177                 .type = META,
 178                 .op = REQ_OP_READ,
 179                 .op_flags = sync ? (READ_SYNC | REQ_META | REQ_PRIO) : REQ_RAHEAD,
 180                 .encrypted_page = NULL,
 181                 .is_meta = (type != META_POR),
 182         };
 183         struct blk_plug plug;
 184
 185         if (unlikely(type == META_POR))
 186                 fio.op_flags &= ~REQ_META;
 187
 188         blk_start_plug(&plug);
 189         for (; nrpages-- > 0; blkno++) {
 190
 191                 if (!f2fs_is_valid_blkaddr(sbi, blkno, type))
 192                         goto out;
 193
 194                 switch (type) {
 195                 case META_NAT:
 196                         if (unlikely(blkno >=
 197                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 198                                 blkno = 0;
 199                         /* get nat block addr */
 200                         fio.new_blkaddr = current_nat_addr(sbi,
 201                                         blkno * NAT_ENTRY_PER_BLOCK);
 202                         break;
 203                 case META_SIT:
 204                         if (unlikely(blkno >= TOTAL_SEGS(sbi)))
 205                                 goto out;
 206                         /* get sit block addr */
 207                         fio.new_blkaddr = current_sit_addr(sbi,
 208                                         blkno * SIT_ENTRY_PER_BLOCK);
 209                         break;
 210                 case META_SSA:
 211                 case META_CP:
 212                 case META_POR:
 213                         fio.new_blkaddr = blkno;
 214                         break;
 215                 default:
 216                         BUG();
 217                 }
 218
 219                 page = f2fs_grab_cache_page(META_MAPPING(sbi),
 220                                                 fio.new_blkaddr, false);
 221                 if (!page)
 222                         continue;
 223                 if (PageUptodate(page)) {
 224                         f2fs_put_page(page, 1);
 225                         continue;
 226                 }
 227
 228                 fio.page = page;
 229                 fio.old_blkaddr = fio.new_blkaddr;
 230                 f2fs_submit_page_mbio(&fio);
 231                 f2fs_put_page(page, 0);
 232         }
 233 out:
 234         f2fs_submit_merged_bio(sbi, META, READ);
 235         blk_finish_plug(&plug);
 236         return blkno - start;
 237 }
 238
 239 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 240 {
 241         struct page *page;
 242         bool readahead = false;
 243
 244         page = find_get_page(META_MAPPING(sbi), index);
 245         if (!page || !PageUptodate(page))
 246                 readahead = true;
 247         f2fs_put_page(page, 0);
 248
 249         if (readahead)
 250                 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR, true);
 251 }
 252
 253 static int f2fs_write_meta_page(struct page *page,
 254                                 struct writeback_control *wbc)
 255 {
 256         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 257
 258         trace_f2fs_writepage(page, META);
 259
 260         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 261                 goto redirty_out;
 262         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 263                 goto redirty_out;
 264         if (unlikely(f2fs_cp_error(sbi)))
 265                 goto redirty_out;
 266
 267         write_meta_page(sbi, page);
 268         dec_page_count(sbi, F2FS_DIRTY_META);
 269
 270         if (wbc->for_reclaim)
 271                 f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, META, WRITE);
 272
 273         unlock_page(page);
 274
 275         if (unlikely(f2fs_cp_error(sbi)))
 276                 f2fs_submit_merged_bio(sbi, META, WRITE);
 277
 278         return 0;
 279
 280 redirty_out:
 281         redirty_page_for_writepage(wbc, page);
 282         return AOP_WRITEPAGE_ACTIVATE;
 283 }
 284
 285 static int f2fs_write_meta_pages(struct address_space *mapping,
 286                                 struct writeback_control *wbc)
 287 {
 288         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 289         long diff, written;
 290
 291         /* collect a number of dirty meta pages and write together */
 292         if (wbc->for_kupdate ||
 293                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 294                 goto skip_write;
 295
 296         trace_f2fs_writepages(mapping->host, wbc, META);
 297
 298         /* if mounting is failed, skip writing node pages */
 299         mutex_lock(&sbi->cp_mutex);
 300         diff = nr_pages_to_write(sbi, META, wbc);
 301         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 302         mutex_unlock(&sbi->cp_mutex);
 303         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 304         return 0;
 305
 306 skip_write:
 307         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 308         trace_f2fs_writepages(mapping->host, wbc, META);
 309         return 0;
 310 }
 311
 312 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 313                                                 long nr_to_write)
 314 {
 315         struct address_space *mapping = META_MAPPING(sbi);
 316         pgoff_t index = 0, end = ULONG_MAX, prev = ULONG_MAX;
 317         struct pagevec pvec;
 318         long nwritten = 0;
 319         struct writeback_control wbc = {
 320                 .for_reclaim = 0,
 321         };
 322         struct blk_plug plug;
 323
 324         pagevec_init(&pvec, 0);
 325
 326         blk_start_plug(&plug);
 327
 328         while (index <= end) {
 329                 int i, nr_pages;
 330                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 331                                 PAGECACHE_TAG_DIRTY,
 332                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 333                 if (unlikely(nr_pages == 0))
 334                         break;
 335
 336                 for (i = 0; i < nr_pages; i++) {
 337                         struct page *page = pvec.pages[i];
 338
 339                         if (prev == ULONG_MAX)
 340                                 prev = page->index - 1;
 341                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 342                                 pagevec_release(&pvec);
 343                                 goto stop;
 344                         }
 345
 346                         lock_page(page);
 347
 348                         if (unlikely(page->mapping != mapping)) {
 349 continue_unlock:
 350                                 unlock_page(page);
 351                                 continue;
 352                         }
 353                         if (!PageDirty(page)) {
 354                                 /* someone wrote it for us */
 355                                 goto continue_unlock;
 356                         }
 357
 358                         f2fs_wait_on_page_writeback(page, META, true);
 359
 360                         BUG_ON(PageWriteback(page));
 361                         if (!clear_page_dirty_for_io(page))
 362                                 goto continue_unlock;
 363
 364                         if (mapping->a_ops->writepage(page, &wbc)) {
 365                                 unlock_page(page);
 366                                 break;
 367                         }
 368                         nwritten++;
 369                         prev = page->index;
 370                         if (unlikely(nwritten >= nr_to_write))
 371                                 break;
 372                 }
 373                 pagevec_release(&pvec);
 374                 cond_resched();
 375         }
 376 stop:
 377         if (nwritten)
 378                 f2fs_submit_merged_bio(sbi, type, WRITE);
 379
 380         blk_finish_plug(&plug);
 381
 382         return nwritten;
 383 }
 384
 385 static int f2fs_set_meta_page_dirty(struct page *page)
 386 {
 387         trace_f2fs_set_page_dirty(page, META);
 388
 389         if (!PageUptodate(page))
 390                 SetPageUptodate(page);
 391         if (!PageDirty(page)) {
 392                 f2fs_set_page_dirty_nobuffers(page);
 393                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 394                 SetPagePrivate(page);
 395                 f2fs_trace_pid(page);
 396                 return 1;
 397         }
 398         return 0;
 399 }
 400
 401 const struct address_space_operations f2fs_meta_aops = {
 402         .writepage      = f2fs_write_meta_page,
 403         .writepages     = f2fs_write_meta_pages,
 404         .set_page_dirty = f2fs_set_meta_page_dirty,
 405         .invalidatepage = f2fs_invalidate_page,
 406         .releasepage    = f2fs_release_page,
 407 #ifdef CONFIG_MIGRATION
 408         .migratepage    = f2fs_migrate_page,
 409 #endif
 410 };
 411
 412 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 413 {
 414         struct inode_management *im = &sbi->im[type];
 415         struct ino_entry *e, *tmp;
 416
 417         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 418 retry:
 419         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 420
 421         spin_lock(&im->ino_lock);
 422         e = radix_tree_lookup(&im->ino_root, ino);
 423         if (!e) {
 424                 e = tmp;
 425                 if (radix_tree_insert(&im->ino_root, ino, e)) {
 426                         spin_unlock(&im->ino_lock);
 427                         radix_tree_preload_end();
 428                         goto retry;
 429                 }
 430                 memset(e, 0, sizeof(struct ino_entry));
 431                 e->ino = ino;
 432
 433                 list_add_tail(&e->list, &im->ino_list);
 434                 if (type != ORPHAN_INO)
 435                         im->ino_num++;
 436         }
 437         spin_unlock(&im->ino_lock);
 438         radix_tree_preload_end();
 439
 440         if (e != tmp)
 441                 kmem_cache_free(ino_entry_slab, tmp);
 442 }
 443
 444 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 445 {
 446         struct inode_management *im = &sbi->im[type];
 447         struct ino_entry *e;
 448
 449         spin_lock(&im->ino_lock);
 450         e = radix_tree_lookup(&im->ino_root, ino);
 451         if (e) {
 452                 list_del(&e->list);
 453                 radix_tree_delete(&im->ino_root, ino);
 454                 im->ino_num--;
 455                 spin_unlock(&im->ino_lock);
 456                 kmem_cache_free(ino_entry_slab, e);
 457                 return;
 458         }
 459         spin_unlock(&im->ino_lock);
 460 }
 461
 462 void add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 463 {
 464         /* add new dirty ino entry into list */
 465         __add_ino_entry(sbi, ino, type);
 466 }
 467
 468 void remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 469 {
 470         /* remove dirty ino entry from list */
 471         __remove_ino_entry(sbi, ino, type);
 472 }
 473
 474 /* mode should be APPEND_INO or UPDATE_INO */
 475 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 476 {
 477         struct inode_management *im = &sbi->im[mode];
 478         struct ino_entry *e;
 479
 480         spin_lock(&im->ino_lock);
 481         e = radix_tree_lookup(&im->ino_root, ino);
 482         spin_unlock(&im->ino_lock);
 483         return e ? true : false;
 484 }
 485
 486 void release_ino_entry(struct f2fs_sb_info *sbi, bool all)
 487 {
 488         struct ino_entry *e, *tmp;
 489         int i;
 490
 491         for (i = all ? ORPHAN_INO: APPEND_INO; i <= UPDATE_INO; i++) {
 492                 struct inode_management *im = &sbi->im[i];
 493
 494                 spin_lock(&im->ino_lock);
 495                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 496                         list_del(&e->list);
 497                         radix_tree_delete(&im->ino_root, e->ino);
 498                         kmem_cache_free(ino_entry_slab, e);
 499                         im->ino_num--;
 500                 }
 501                 spin_unlock(&im->ino_lock);
 502         }
 503 }
 504
 505 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 506 {
 507         struct inode_management *im = &sbi->im[ORPHAN_INO];
 508         int err = 0;
 509
 510         spin_lock(&im->ino_lock);
 511
 512 #ifdef CONFIG_F2FS_FAULT_INJECTION
 513         if (time_to_inject(sbi, FAULT_ORPHAN)) {
 514                 spin_unlock(&im->ino_lock);
 515                 return -ENOSPC;
 516         }
 517 #endif
 518         if (unlikely(im->ino_num >= sbi->max_orphans))
 519                 err = -ENOSPC;
 520         else
 521                 im->ino_num++;
 522         spin_unlock(&im->ino_lock);
 523
 524         return err;
 525 }
 526
 527 void release_orphan_inode(struct f2fs_sb_info *sbi)
 528 {
 529         struct inode_management *im = &sbi->im[ORPHAN_INO];
 530
 531         spin_lock(&im->ino_lock);
 532         f2fs_bug_on(sbi, im->ino_num == 0);
 533         im->ino_num--;
 534         spin_unlock(&im->ino_lock);
 535 }
 536
 537 void add_orphan_inode(struct inode *inode)
 538 {
 539         /* add new orphan ino entry into list */
 540         __add_ino_entry(F2FS_I_SB(inode), inode->i_ino, ORPHAN_INO);
 541         update_inode_page(inode);
 542 }
 543
 544 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 545 {
 546         /* remove orphan entry from orphan list */
 547         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 548 }
 549
 550 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 551 {
 552         struct inode *inode;
 553         struct node_info ni;
 554         int err = acquire_orphan_inode(sbi);
 555
 556         if (err) {
 557                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 558                 f2fs_msg(sbi->sb, KERN_WARNING,
 559                                 "%s: orphan failed (ino=%x), run fsck to fix.",
 560                                 __func__, ino);
 561                 return err;
 562         }
 563
 564         __add_ino_entry(sbi, ino, ORPHAN_INO);
 565
 566         inode = f2fs_iget_retry(sbi->sb, ino);
 567         if (IS_ERR(inode)) {
 568                 /*
 569                  * there should be a bug that we can't find the entry
 570                  * to orphan inode.
 571                  */
 572                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 573                 return PTR_ERR(inode);
 574         }
 575
 576         clear_nlink(inode);
 577
 578         /* truncate all the data during iput */
 579         iput(inode);
 580
 581         get_node_info(sbi, ino, &ni);
 582
 583         /* ENOMEM was fully retried in f2fs_evict_inode. */
 584         if (ni.blk_addr != NULL_ADDR) {
 585                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 586                 f2fs_msg(sbi->sb, KERN_WARNING,
 587                         "%s: orphan failed (ino=%x), run fsck to fix.",
 588                                 __func__, ino);
 589                 return -EIO;
 590         }
 591         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 592         return 0;
 593 }
 594
 595 int recover_orphan_inodes(struct f2fs_sb_info *sbi)
 596 {
 597         block_t start_blk, orphan_blocks, i, j;
 598         int err;
 599
 600         if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG))
 601                 return 0;
 602
 603         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 604         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 605
 606         ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 607
 608         for (i = 0; i < orphan_blocks; i++) {
 609                 struct page *page = get_meta_page(sbi, start_blk + i);
 610                 struct f2fs_orphan_block *orphan_blk;
 611
 612                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 613                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 614                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 615                         err = recover_orphan_inode(sbi, ino);
 616                         if (err) {
 617                                 f2fs_put_page(page, 1);
 618                                 return err;
 619                         }
 620                 }
 621                 f2fs_put_page(page, 1);
 622         }
 623         /* clear Orphan Flag */
 624         clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG);
 625         return 0;
 626 }
 627
 628 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 629 {
 630         struct list_head *head;
 631         struct f2fs_orphan_block *orphan_blk = NULL;
 632         unsigned int nentries = 0;
 633         unsigned short index = 1;
 634         unsigned short orphan_blocks;
 635         struct page *page = NULL;
 636         struct ino_entry *orphan = NULL;
 637         struct inode_management *im = &sbi->im[ORPHAN_INO];
 638
 639         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 640
 641         /*
 642          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 643          * orphan inode operations are covered under f2fs_lock_op().
 644          * And, spin_lock should be avoided due to page operations below.
 645          */
 646         head = &im->ino_list;
 647
 648         /* loop for each orphan inode entry and write them in Jornal block */
 649         list_for_each_entry(orphan, head, list) {
 650                 if (!page) {
 651                         page = grab_meta_page(sbi, start_blk++);
 652                         orphan_blk =
 653                                 (struct f2fs_orphan_block *)page_address(page);
 654                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 655                 }
 656
 657                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 658
 659                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 660                         /*
 661                          * an orphan block is full of 1020 entries,
 662                          * then we need to flush current orphan blocks
 663                          * and bring another one in memory
 664                          */
 665                         orphan_blk->blk_addr = cpu_to_le16(index);
 666                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 667                         orphan_blk->entry_count = cpu_to_le32(nentries);
 668                         set_page_dirty(page);
 669                         f2fs_put_page(page, 1);
 670                         index++;
 671                         nentries = 0;
 672                         page = NULL;
 673                 }
 674         }
 675
 676         if (page) {
 677                 orphan_blk->blk_addr = cpu_to_le16(index);
 678                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 679                 orphan_blk->entry_count = cpu_to_le32(nentries);
 680                 set_page_dirty(page);
 681                 f2fs_put_page(page, 1);
 682         }
 683 }
 684
 685 static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
 686                 struct f2fs_checkpoint **cp_block, struct page **cp_page,
 687                 unsigned long long *version)
 688 {
 689         unsigned long blk_size = sbi->blocksize;
 690         size_t crc_offset = 0;
 691         __u32 crc = 0;
 692
 693         *cp_page = get_meta_page(sbi, cp_addr);
 694         *cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
 695
 696         crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
 697         if (crc_offset >= blk_size) {
 698                 f2fs_put_page(*cp_page, 1);
 699                 f2fs_msg(sbi->sb, KERN_WARNING,
 700                         "invalid crc_offset: %zu", crc_offset);
 701                 return -EINVAL;
 702         }
 703
 704         crc = le32_to_cpu(*((__le32 *)((unsigned char *)*cp_block
 705                                                         + crc_offset)));
 706         if (!f2fs_crc_valid(sbi, crc, *cp_block, crc_offset)) {
 707                 f2fs_put_page(*cp_page, 1);
 708                 f2fs_msg(sbi->sb, KERN_WARNING, "invalid crc value");
 709                 return -EINVAL;
 710         }
 711
 712         *version = cur_cp_version(*cp_block);
 713         return 0;
 714 }
 715
 716 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 717                                 block_t cp_addr, unsigned long long *version)
 718 {
 719         struct page *cp_page_1 = NULL, *cp_page_2 = NULL;
 720         struct f2fs_checkpoint *cp_block = NULL;
 721         unsigned long long cur_version = 0, pre_version = 0;
 722         int err;
 723
 724         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 725                                         &cp_page_1, version);
 726         if (err)
 727                 return NULL;
 728
 729         if (le32_to_cpu(cp_block->cp_pack_total_block_count) >
 730                                         sbi->blocks_per_seg) {
 731                 f2fs_msg(sbi->sb, KERN_WARNING,
 732                         "invalid cp_pack_total_block_count:%u",
 733                         le32_to_cpu(cp_block->cp_pack_total_block_count));
 734                 goto invalid_cp;
 735         }
 736         pre_version = *version;
 737
 738         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 739         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 740                                         &cp_page_2, version);
 741         if (err)
 742                 goto invalid_cp;
 743         cur_version = *version;
 744
 745         if (cur_version == pre_version) {
 746                 *version = cur_version;
 747                 f2fs_put_page(cp_page_2, 1);
 748                 return cp_page_1;
 749         }
 750         f2fs_put_page(cp_page_2, 1);
 751 invalid_cp:
 752         f2fs_put_page(cp_page_1, 1);
 753         return NULL;
 754 }
 755
 756 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 757 {
 758         struct f2fs_checkpoint *cp_block;
 759         struct f2fs_super_block *fsb = sbi->raw_super;
 760         struct page *cp1, *cp2, *cur_page;
 761         unsigned long blk_size = sbi->blocksize;
 762         unsigned long long cp1_version = 0, cp2_version = 0;
 763         unsigned long long cp_start_blk_no;
 764         unsigned int cp_blks = 1 + __cp_payload(sbi);
 765         block_t cp_blk_no;
 766         int i;
 767
 768         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 769         if (!sbi->ckpt)
 770                 return -ENOMEM;
 771         /*
 772          * Finding out valid cp block involves read both
 773          * sets( cp pack1 and cp pack 2)
 774          */
 775         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 776         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 777
 778         /* The second checkpoint pack should start at the next segment */
 779         cp_start_blk_no += ((unsigned long long)1) <<
 780                                 le32_to_cpu(fsb->log_blocks_per_seg);
 781         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 782
 783         if (cp1 && cp2) {
 784                 if (ver_after(cp2_version, cp1_version))
 785                         cur_page = cp2;
 786                 else
 787                         cur_page = cp1;
 788         } else if (cp1) {
 789                 cur_page = cp1;
 790         } else if (cp2) {
 791                 cur_page = cp2;
 792         } else {
 793                 goto fail_no_cp;
 794         }
 795
 796         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 797         memcpy(sbi->ckpt, cp_block, blk_size);
 798
 799         if (cur_page == cp1)
 800                 sbi->cur_cp_pack = 1;
 801         else
 802                 sbi->cur_cp_pack = 2;
 803
 804         /* Sanity checking of checkpoint */
 805         if (sanity_check_ckpt(sbi))
 806                 goto free_fail_no_cp;
 807
 808         if (cp_blks <= 1)
 809                 goto done;
 810
 811         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 812         if (cur_page == cp2)
 813                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 814
 815         for (i = 1; i < cp_blks; i++) {
 816                 void *sit_bitmap_ptr;
 817                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 818
 819                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 820                 sit_bitmap_ptr = page_address(cur_page);
 821                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 822                 f2fs_put_page(cur_page, 1);
 823         }
 824 done:
 825         f2fs_put_page(cp1, 1);
 826         f2fs_put_page(cp2, 1);
 827         return 0;
 828
 829 free_fail_no_cp:
 830         f2fs_put_page(cp1, 1);
 831         f2fs_put_page(cp2, 1);
 832 fail_no_cp:
 833         kfree(sbi->ckpt);
 834         return -EINVAL;
 835 }
 836
 837 static void __add_dirty_inode(struct inode *inode, enum inode_type type)
 838 {
 839         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 840         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 841
 842         if (is_inode_flag_set(inode, flag))
 843                 return;
 844
 845         set_inode_flag(inode, flag);
 846         list_add_tail(&F2FS_I(inode)->dirty_list, &sbi->inode_list[type]);
 847         stat_inc_dirty_inode(sbi, type);
 848 }
 849
 850 static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
 851 {
 852         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 853
 854         if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
 855                 return;
 856
 857         list_del_init(&F2FS_I(inode)->dirty_list);
 858         clear_inode_flag(inode, flag);
 859         stat_dec_dirty_inode(F2FS_I_SB(inode), type);
 860 }
 861
 862 void update_dirty_page(struct inode *inode, struct page *page)
 863 {
 864         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 865         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 866
 867         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 868                         !S_ISLNK(inode->i_mode))
 869                 return;
 870
 871         spin_lock(&sbi->inode_lock[type]);
 872         if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
 873                 __add_dirty_inode(inode, type);
 874         inode_inc_dirty_pages(inode);
 875         spin_unlock(&sbi->inode_lock[type]);
 876
 877         SetPagePrivate(page);
 878         f2fs_trace_pid(page);
 879 }
 880
 881 void remove_dirty_inode(struct inode *inode)
 882 {
 883         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 884         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 885
 886         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 887                         !S_ISLNK(inode->i_mode))
 888                 return;
 889
 890         if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
 891                 return;
 892
 893         spin_lock(&sbi->inode_lock[type]);
 894         __remove_dirty_inode(inode, type);
 895         spin_unlock(&sbi->inode_lock[type]);
 896 }
 897
 898 int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
 899 {
 900         struct list_head *head;
 901         struct inode *inode;
 902         struct f2fs_inode_info *fi;
 903         bool is_dir = (type == DIR_INODE);
 904
 905         trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
 906                                 get_pages(sbi, is_dir ?
 907                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 908 retry:
 909         if (unlikely(f2fs_cp_error(sbi))) {
 910                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
 911                                 get_pages(sbi, is_dir ?
 912                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 913                 return -EIO;
 914         }
 915
 916         spin_lock(&sbi->inode_lock[type]);
 917
 918         head = &sbi->inode_list[type];
 919         if (list_empty(head)) {
 920                 spin_unlock(&sbi->inode_lock[type]);
 921                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
 922                                 get_pages(sbi, is_dir ?
 923                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 924                 return 0;
 925         }
 926         fi = list_entry(head->next, struct f2fs_inode_info, dirty_list);
 927         inode = igrab(&fi->vfs_inode);
 928         spin_unlock(&sbi->inode_lock[type]);
 929         if (inode) {
 930                 filemap_fdatawrite(inode->i_mapping);
 931                 iput(inode);
 932         } else {
 933                 /*
 934                  * We should submit bio, since it exists several
 935                  * wribacking dentry pages in the freeing inode.
 936                  */
 937                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 938                 cond_resched();
 939         }
 940         goto retry;
 941 }
 942
 943 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
 944 {
 945         struct list_head *head = &sbi->inode_list[DIRTY_META];
 946         struct inode *inode;
 947         struct f2fs_inode_info *fi;
 948         s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
 949
 950         while (total--) {
 951                 if (unlikely(f2fs_cp_error(sbi)))
 952                         return -EIO;
 953
 954                 spin_lock(&sbi->inode_lock[DIRTY_META]);
 955                 if (list_empty(head)) {
 956                         spin_unlock(&sbi->inode_lock[DIRTY_META]);
 957                         return 0;
 958                 }
 959                 fi = list_entry(head->next, struct f2fs_inode_info,
 960                                                         gdirty_list);
 961                 inode = igrab(&fi->vfs_inode);
 962                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
 963                 if (inode) {
 964                         update_inode_page(inode);
 965                         iput(inode);
 966                 }
 967         };
 968         return 0;
 969 }
 970
 971 /*
 972  * Freeze all the FS-operations for checkpoint.
 973  */
 974 static int block_operations(struct f2fs_sb_info *sbi)
 975 {
 976         struct writeback_control wbc = {
 977                 .sync_mode = WB_SYNC_ALL,
 978                 .nr_to_write = LONG_MAX,
 979                 .for_reclaim = 0,
 980         };
 981         struct blk_plug plug;
 982         int err = 0;
 983
 984         blk_start_plug(&plug);
 985
 986 retry_flush_dents:
 987         f2fs_lock_all(sbi);
 988         /* write all the dirty dentry pages */
 989         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 990                 f2fs_unlock_all(sbi);
 991                 err = sync_dirty_inodes(sbi, DIR_INODE);
 992                 if (err)
 993                         goto out;
 994                 goto retry_flush_dents;
 995         }
 996
 997         if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
 998                 f2fs_unlock_all(sbi);
 999                 err = f2fs_sync_inode_meta(sbi);
1000                 if (err)
1001                         goto out;
1002                 goto retry_flush_dents;
1003         }
1004
1005         /*
1006          * POR: we should ensure that there are no dirty node pages
1007          * until finishing nat/sit flush.
1008          */
1009 retry_flush_nodes:
1010         down_write(&sbi->node_write);
1011
1012         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
1013                 up_write(&sbi->node_write);
1014                 err = sync_node_pages(sbi, &wbc);
1015                 if (err) {
1016                         f2fs_unlock_all(sbi);
1017                         goto out;
1018                 }
1019                 goto retry_flush_nodes;
1020         }
1021 out:
1022         blk_finish_plug(&plug);
1023         return err;
1024 }
1025
1026 static void unblock_operations(struct f2fs_sb_info *sbi)
1027 {
1028         up_write(&sbi->node_write);
1029
1030         build_free_nids(sbi);
1031         f2fs_unlock_all(sbi);
1032 }
1033
1034 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
1035 {
1036         DEFINE_WAIT(wait);
1037
1038         for (;;) {
1039                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
1040
1041                 if (!atomic_read(&sbi->nr_wb_bios))
1042                         break;
1043
1044                 io_schedule_timeout(5*HZ);
1045         }
1046         finish_wait(&sbi->cp_wait, &wait);
1047 }
1048
1049 static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1050 {
1051         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
1052         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1053
1054         spin_lock(&sbi->cp_lock);
1055
1056         if (cpc->reason == CP_UMOUNT)
1057                 __set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1058         else
1059                 __clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1060
1061         if (cpc->reason == CP_FASTBOOT)
1062                 __set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1063         else
1064                 __clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1065
1066         if (orphan_num)
1067                 __set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1068         else
1069                 __clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1070
1071         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1072                 __set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1073
1074         /* set this flag to activate crc|cp_ver for recovery */
1075         __set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
1076
1077         spin_unlock(&sbi->cp_lock);
1078 }
1079
1080 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1081 {
1082         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1083         struct f2fs_nm_info *nm_i = NM_I(sbi);
1084         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
1085         nid_t last_nid = nm_i->next_scan_nid;
1086         block_t start_blk;
1087         unsigned int data_sum_blocks, orphan_blocks;
1088         __u32 crc32 = 0;
1089         int i;
1090         int cp_payload_blks = __cp_payload(sbi);
1091         struct super_block *sb = sbi->sb;
1092         struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
1093         u64 kbytes_written;
1094
1095         /* Flush all the NAT/SIT pages */
1096         while (get_pages(sbi, F2FS_DIRTY_META)) {
1097                 sync_meta_pages(sbi, META, LONG_MAX);
1098                 if (unlikely(f2fs_cp_error(sbi)))
1099                         return -EIO;
1100         }
1101
1102         next_free_nid(sbi, &last_nid);
1103
1104         /*
1105          * modify checkpoint
1106          * version number is already updated
1107          */
1108         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
1109         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
1110         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
1111         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
1112                 ckpt->cur_node_segno[i] =
1113                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
1114                 ckpt->cur_node_blkoff[i] =
1115                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
1116                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
1117                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
1118         }
1119         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
1120                 ckpt->cur_data_segno[i] =
1121                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
1122                 ckpt->cur_data_blkoff[i] =
1123                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
1124                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
1125                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
1126         }
1127
1128         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
1129         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
1130         ckpt->next_free_nid = cpu_to_le32(last_nid);
1131
1132         /* 2 cp  + n data seg summary + orphan inode blocks */
1133         data_sum_blocks = npages_for_summary_flush(sbi, false);
1134         spin_lock(&sbi->cp_lock);
1135         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
1136                 __set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1137         else
1138                 __clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1139         spin_unlock(&sbi->cp_lock);
1140
1141         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
1142         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
1143                         orphan_blocks);
1144
1145         if (__remain_node_summaries(cpc->reason))
1146                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
1147                                 cp_payload_blks + data_sum_blocks +
1148                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
1149         else
1150                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1151                                 cp_payload_blks + data_sum_blocks +
1152                                 orphan_blocks);
1153
1154         /* update ckpt flag for checkpoint */
1155         update_ckpt_flags(sbi, cpc);
1156
1157         /* update SIT/NAT bitmap */
1158         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1159         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1160
1161         crc32 = f2fs_crc32(sbi, ckpt, le32_to_cpu(ckpt->checksum_offset));
1162         *((__le32 *)((unsigned char *)ckpt +
1163                                 le32_to_cpu(ckpt->checksum_offset)))
1164                                 = cpu_to_le32(crc32);
1165
1166         start_blk = __start_cp_next_addr(sbi);
1167
1168         /* need to wait for end_io results */
1169         wait_on_all_pages_writeback(sbi);
1170         if (unlikely(f2fs_cp_error(sbi)))
1171                 return -EIO;
1172
1173         /* write out checkpoint buffer at block 0 */
1174         update_meta_page(sbi, ckpt, start_blk++);
1175
1176         for (i = 1; i < 1 + cp_payload_blks; i++)
1177                 update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1178                                                         start_blk++);
1179
1180         if (orphan_num) {
1181                 write_orphan_inodes(sbi, start_blk);
1182                 start_blk += orphan_blocks;
1183         }
1184
1185         write_data_summaries(sbi, start_blk);
1186         start_blk += data_sum_blocks;
1187
1188         /* Record write statistics in the hot node summary */
1189         kbytes_written = sbi->kbytes_written;
1190         if (sb->s_bdev->bd_part)
1191                 kbytes_written += BD_PART_WRITTEN(sbi);
1192
1193         seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
1194
1195         if (__remain_node_summaries(cpc->reason)) {
1196                 write_node_summaries(sbi, start_blk);
1197                 start_blk += NR_CURSEG_NODE_TYPE;
1198         }
1199
1200         /* writeout checkpoint block */
1201         update_meta_page(sbi, ckpt, start_blk);
1202
1203         /* wait for previous submitted node/meta pages writeback */
1204         wait_on_all_pages_writeback(sbi);
1205
1206         if (unlikely(f2fs_cp_error(sbi)))
1207                 return -EIO;
1208
1209         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LLONG_MAX);
1210         filemap_fdatawait_range(META_MAPPING(sbi), 0, LLONG_MAX);
1211
1212         /* update user_block_counts */
1213         sbi->last_valid_block_count = sbi->total_valid_block_count;
1214         percpu_counter_set(&sbi->alloc_valid_block_count, 0);
1215
1216         /* Here, we only have one bio having CP pack */
1217         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
1218
1219         /* wait for previous submitted meta pages writeback */
1220         wait_on_all_pages_writeback(sbi);
1221
1222         release_ino_entry(sbi, false);
1223
1224         if (unlikely(f2fs_cp_error(sbi)))
1225                 return -EIO;
1226
1227         clear_prefree_segments(sbi, cpc);
1228         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1229         clear_sbi_flag(sbi, SBI_NEED_CP);
1230         __set_cp_next_pack(sbi);
1231
1232         /*
1233          * redirty superblock if metadata like node page or inode cache is
1234          * updated during writing checkpoint.
1235          */
1236         if (get_pages(sbi, F2FS_DIRTY_NODES) ||
1237                         get_pages(sbi, F2FS_DIRTY_IMETA))
1238                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1239
1240         f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS));
1241
1242         return 0;
1243 }
1244
1245 /*
1246  * We guarantee that this checkpoint procedure will not fail.
1247  */
1248 int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1249 {
1250         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1251         unsigned long long ckpt_ver;
1252         int err = 0;
1253
1254         mutex_lock(&sbi->cp_mutex);
1255
1256         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1257                 (cpc->reason == CP_FASTBOOT || cpc->reason == CP_SYNC ||
1258                 (cpc->reason == CP_DISCARD && !sbi->discard_blks)))
1259                 goto out;
1260         if (unlikely(f2fs_cp_error(sbi))) {
1261                 err = -EIO;
1262                 goto out;
1263         }
1264         if (f2fs_readonly(sbi->sb)) {
1265                 err = -EROFS;
1266                 goto out;
1267         }
1268
1269         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1270
1271         err = block_operations(sbi);
1272         if (err)
1273                 goto out;
1274
1275         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1276
1277         f2fs_flush_merged_bios(sbi);
1278
1279         /* this is the case of multiple fstrims without any changes */
1280         if (cpc->reason == CP_DISCARD && !is_sbi_flag_set(sbi, SBI_IS_DIRTY)) {
1281                 f2fs_bug_on(sbi, NM_I(sbi)->dirty_nat_cnt);
1282                 f2fs_bug_on(sbi, SIT_I(sbi)->dirty_sentries);
1283                 f2fs_bug_on(sbi, prefree_segments(sbi));
1284                 flush_sit_entries(sbi, cpc);
1285                 clear_prefree_segments(sbi, cpc);
1286                 f2fs_wait_all_discard_bio(sbi);
1287                 unblock_operations(sbi);
1288                 goto out;
1289         }
1290
1291         /*
1292          * update checkpoint pack index
1293          * Increase the version number so that
1294          * SIT entries and seg summaries are written at correct place
1295          */
1296         ckpt_ver = cur_cp_version(ckpt);
1297         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1298
1299         /* write cached NAT/SIT entries to NAT/SIT area */
1300         flush_nat_entries(sbi);
1301         flush_sit_entries(sbi, cpc);
1302
1303         /* unlock all the fs_lock[] in do_checkpoint() */
1304         err = do_checkpoint(sbi, cpc);
1305
1306         f2fs_wait_all_discard_bio(sbi);
1307
1308         unblock_operations(sbi);
1309         stat_inc_cp_count(sbi->stat_info);
1310
1311         if (cpc->reason == CP_RECOVERY)
1312                 f2fs_msg(sbi->sb, KERN_NOTICE,
1313                         "checkpoint: version = %llx", ckpt_ver);
1314
1315         /* do checkpoint periodically */
1316         f2fs_update_time(sbi, CP_TIME);
1317         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1318 out:
1319         mutex_unlock(&sbi->cp_mutex);
1320         return err;
1321 }
1322
1323 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1324 {
1325         int i;
1326
1327         for (i = 0; i < MAX_INO_ENTRY; i++) {
1328                 struct inode_management *im = &sbi->im[i];
1329
1330                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1331                 spin_lock_init(&im->ino_lock);
1332                 INIT_LIST_HEAD(&im->ino_list);
1333                 im->ino_num = 0;
1334         }
1335
1336         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1337                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1338                                 F2FS_ORPHANS_PER_BLOCK;
1339 }
1340
1341 int __init create_checkpoint_caches(void)
1342 {
1343         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1344                         sizeof(struct ino_entry));
1345         if (!ino_entry_slab)
1346                 return -ENOMEM;
1347         inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1348                         sizeof(struct inode_entry));
1349         if (!inode_entry_slab) {
1350                 kmem_cache_destroy(ino_entry_slab);
1351                 return -ENOMEM;
1352         }
1353         return 0;
1354 }
1355
1356 void destroy_checkpoint_caches(void)
1357 {
1358         kmem_cache_destroy(ino_entry_slab);
1359         kmem_cache_destroy(inode_entry_slab);
1360 }