fs/f2fs/checkpoint.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/checkpoint.c
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  */
   8 #include <linux/fs.h>
   9 #include <linux/bio.h>
  10 #include <linux/mpage.h>
  11 #include <linux/writeback.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/f2fs_fs.h>
  14 #include <linux/pagevec.h>
  15 #include <linux/swap.h>
  16
  17 #include "f2fs.h"
  18 #include "node.h"
  19 #include "segment.h"
  20 #include "trace.h"
  21 #include <trace/events/f2fs.h>
  22
  23 static struct kmem_cache *ino_entry_slab;
  24 struct kmem_cache *f2fs_inode_entry_slab;
  25
  26 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
  27 {
  28         f2fs_build_fault_attr(sbi, 0, 0);
  29         set_ckpt_flags(sbi, CP_ERROR_FLAG);
  30         if (!end_io)
  31                 f2fs_flush_merged_writes(sbi);
  32 }
  33
  34 /*
  35  * We guarantee no failure on the returned page.
  36  */
  37 struct page *f2fs_grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  38 {
  39         struct address_space *mapping = META_MAPPING(sbi);
  40         struct page *page = NULL;
  41 repeat:
  42         page = f2fs_grab_cache_page(mapping, index, false);
  43         if (!page) {
  44                 cond_resched();
  45                 goto repeat;
  46         }
  47         f2fs_wait_on_page_writeback(page, META, true, true);
  48         if (!PageUptodate(page))
  49                 SetPageUptodate(page);
  50         return page;
  51 }
  52
  53 /*
  54  * We guarantee no failure on the returned page.
  55  */
  56 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
  57                                                         bool is_meta)
  58 {
  59         struct address_space *mapping = META_MAPPING(sbi);
  60         struct page *page;
  61         struct f2fs_io_info fio = {
  62                 .sbi = sbi,
  63                 .type = META,
  64                 .op = REQ_OP_READ,
  65                 .op_flags = REQ_META | REQ_PRIO,
  66                 .old_blkaddr = index,
  67                 .new_blkaddr = index,
  68                 .encrypted_page = NULL,
  69                 .is_meta = is_meta,
  70         };
  71         int err;
  72
  73         if (unlikely(!is_meta))
  74                 fio.op_flags &= ~REQ_META;
  75 repeat:
  76         page = f2fs_grab_cache_page(mapping, index, false);
  77         if (!page) {
  78                 cond_resched();
  79                 goto repeat;
  80         }
  81         if (PageUptodate(page))
  82                 goto out;
  83
  84         fio.page = page;
  85
  86         err = f2fs_submit_page_bio(&fio);
  87         if (err) {
  88                 f2fs_put_page(page, 1);
  89                 return ERR_PTR(err);
  90         }
  91
  92         lock_page(page);
  93         if (unlikely(page->mapping != mapping)) {
  94                 f2fs_put_page(page, 1);
  95                 goto repeat;
  96         }
  97
  98         if (unlikely(!PageUptodate(page))) {
  99                 f2fs_put_page(page, 1);
 100                 return ERR_PTR(-EIO);
 101         }
 102 out:
 103         return page;
 104 }
 105
 106 struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 107 {
 108         return __get_meta_page(sbi, index, true);
 109 }
 110
 111 struct page *f2fs_get_meta_page_nofail(struct f2fs_sb_info *sbi, pgoff_t index)
 112 {
 113         struct page *page;
 114         int count = 0;
 115
 116 retry:
 117         page = __get_meta_page(sbi, index, true);
 118         if (IS_ERR(page)) {
 119                 if (PTR_ERR(page) == -EIO &&
 120                                 ++count <= DEFAULT_RETRY_IO_COUNT)
 121                         goto retry;
 122                 f2fs_stop_checkpoint(sbi, false);
 123         }
 124         return page;
 125 }
 126
 127 /* for POR only */
 128 struct page *f2fs_get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 129 {
 130         return __get_meta_page(sbi, index, false);
 131 }
 132
 133 bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
 134                                         block_t blkaddr, int type)
 135 {
 136         switch (type) {
 137         case META_NAT:
 138                 break;
 139         case META_SIT:
 140                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 141                         return false;
 142                 break;
 143         case META_SSA:
 144                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 145                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 146                         return false;
 147                 break;
 148         case META_CP:
 149                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 150                         blkaddr < __start_cp_addr(sbi)))
 151                         return false;
 152                 break;
 153         case META_POR:
 154         case DATA_GENERIC:
 155                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 156                         blkaddr < MAIN_BLKADDR(sbi))) {
 157                         if (type == DATA_GENERIC) {
 158                                 f2fs_msg(sbi->sb, KERN_WARNING,
 159                                         "access invalid blkaddr:%u", blkaddr);
 160                                 WARN_ON(1);
 161                         }
 162                         return false;
 163                 }
 164                 break;
 165         case META_GENERIC:
 166                 if (unlikely(blkaddr < SEG0_BLKADDR(sbi) ||
 167                         blkaddr >= MAIN_BLKADDR(sbi)))
 168                         return false;
 169                 break;
 170         default:
 171                 BUG();
 172         }
 173
 174         return true;
 175 }
 176
 177 /*
 178  * Readahead CP/NAT/SIT/SSA pages
 179  */
 180 int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 181                                                         int type, bool sync)
 182 {
 183         struct page *page;
 184         block_t blkno = start;
 185         struct f2fs_io_info fio = {
 186                 .sbi = sbi,
 187                 .type = META,
 188                 .op = REQ_OP_READ,
 189                 .op_flags = sync ? (REQ_META | REQ_PRIO) : REQ_RAHEAD,
 190                 .encrypted_page = NULL,
 191                 .in_list = false,
 192                 .is_meta = (type != META_POR),
 193         };
 194         struct blk_plug plug;
 195
 196         if (unlikely(type == META_POR))
 197                 fio.op_flags &= ~REQ_META;
 198
 199         blk_start_plug(&plug);
 200         for (; nrpages-- > 0; blkno++) {
 201
 202                 if (!f2fs_is_valid_blkaddr(sbi, blkno, type))
 203                         goto out;
 204
 205                 switch (type) {
 206                 case META_NAT:
 207                         if (unlikely(blkno >=
 208                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 209                                 blkno = 0;
 210                         /* get nat block addr */
 211                         fio.new_blkaddr = current_nat_addr(sbi,
 212                                         blkno * NAT_ENTRY_PER_BLOCK);
 213                         break;
 214                 case META_SIT:
 215                         /* get sit block addr */
 216                         fio.new_blkaddr = current_sit_addr(sbi,
 217                                         blkno * SIT_ENTRY_PER_BLOCK);
 218                         break;
 219                 case META_SSA:
 220                 case META_CP:
 221                 case META_POR:
 222                         fio.new_blkaddr = blkno;
 223                         break;
 224                 default:
 225                         BUG();
 226                 }
 227
 228                 page = f2fs_grab_cache_page(META_MAPPING(sbi),
 229                                                 fio.new_blkaddr, false);
 230                 if (!page)
 231                         continue;
 232                 if (PageUptodate(page)) {
 233                         f2fs_put_page(page, 1);
 234                         continue;
 235                 }
 236
 237                 fio.page = page;
 238                 f2fs_submit_page_bio(&fio);
 239                 f2fs_put_page(page, 0);
 240         }
 241 out:
 242         blk_finish_plug(&plug);
 243         return blkno - start;
 244 }
 245
 246 void f2fs_ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 247 {
 248         struct page *page;
 249         bool readahead = false;
 250
 251         page = find_get_page(META_MAPPING(sbi), index);
 252         if (!page || !PageUptodate(page))
 253                 readahead = true;
 254         f2fs_put_page(page, 0);
 255
 256         if (readahead)
 257                 f2fs_ra_meta_pages(sbi, index, BIO_MAX_PAGES, META_POR, true);
 258 }
 259
 260 static int __f2fs_write_meta_page(struct page *page,
 261                                 struct writeback_control *wbc,
 262                                 enum iostat_type io_type)
 263 {
 264         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 265
 266         trace_f2fs_writepage(page, META);
 267
 268         if (unlikely(f2fs_cp_error(sbi)))
 269                 goto redirty_out;
 270         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 271                 goto redirty_out;
 272         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 273                 goto redirty_out;
 274
 275         f2fs_do_write_meta_page(sbi, page, io_type);
 276         dec_page_count(sbi, F2FS_DIRTY_META);
 277
 278         if (wbc->for_reclaim)
 279                 f2fs_submit_merged_write_cond(sbi, NULL, page, 0, META);
 280
 281         unlock_page(page);
 282
 283         if (unlikely(f2fs_cp_error(sbi)))
 284                 f2fs_submit_merged_write(sbi, META);
 285
 286         return 0;
 287
 288 redirty_out:
 289         redirty_page_for_writepage(wbc, page);
 290         return AOP_WRITEPAGE_ACTIVATE;
 291 }
 292
 293 static int f2fs_write_meta_page(struct page *page,
 294                                 struct writeback_control *wbc)
 295 {
 296         return __f2fs_write_meta_page(page, wbc, FS_META_IO);
 297 }
 298
 299 static int f2fs_write_meta_pages(struct address_space *mapping,
 300                                 struct writeback_control *wbc)
 301 {
 302         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 303         long diff, written;
 304
 305         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 306                 goto skip_write;
 307
 308         /* collect a number of dirty meta pages and write together */
 309         if (wbc->sync_mode != WB_SYNC_ALL &&
 310                         get_pages(sbi, F2FS_DIRTY_META) <
 311                                         nr_pages_to_skip(sbi, META))
 312                 goto skip_write;
 313
 314         /* if locked failed, cp will flush dirty pages instead */
 315         if (!mutex_trylock(&sbi->cp_mutex))
 316                 goto skip_write;
 317
 318         trace_f2fs_writepages(mapping->host, wbc, META);
 319         diff = nr_pages_to_write(sbi, META, wbc);
 320         written = f2fs_sync_meta_pages(sbi, META, wbc->nr_to_write, FS_META_IO);
 321         mutex_unlock(&sbi->cp_mutex);
 322         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 323         return 0;
 324
 325 skip_write:
 326         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 327         trace_f2fs_writepages(mapping->host, wbc, META);
 328         return 0;
 329 }
 330
 331 long f2fs_sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 332                                 long nr_to_write, enum iostat_type io_type)
 333 {
 334         struct address_space *mapping = META_MAPPING(sbi);
 335         pgoff_t index = 0, prev = ULONG_MAX;
 336         struct pagevec pvec;
 337         long nwritten = 0;
 338         int nr_pages;
 339         struct writeback_control wbc = {
 340                 .for_reclaim = 0,
 341         };
 342         struct blk_plug plug;
 343
 344         pagevec_init(&pvec);
 345
 346         blk_start_plug(&plug);
 347
 348         while ((nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 349                                 PAGECACHE_TAG_DIRTY))) {
 350                 int i;
 351
 352                 for (i = 0; i < nr_pages; i++) {
 353                         struct page *page = pvec.pages[i];
 354
 355                         if (prev == ULONG_MAX)
 356                                 prev = page->index - 1;
 357                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 358                                 pagevec_release(&pvec);
 359                                 goto stop;
 360                         }
 361
 362                         lock_page(page);
 363
 364                         if (unlikely(page->mapping != mapping)) {
 365 continue_unlock:
 366                                 unlock_page(page);
 367                                 continue;
 368                         }
 369                         if (!PageDirty(page)) {
 370                                 /* someone wrote it for us */
 371                                 goto continue_unlock;
 372                         }
 373
 374                         f2fs_wait_on_page_writeback(page, META, true, true);
 375
 376                         if (!clear_page_dirty_for_io(page))
 377                                 goto continue_unlock;
 378
 379                         if (__f2fs_write_meta_page(page, &wbc, io_type)) {
 380                                 unlock_page(page);
 381                                 break;
 382                         }
 383                         nwritten++;
 384                         prev = page->index;
 385                         if (unlikely(nwritten >= nr_to_write))
 386                                 break;
 387                 }
 388                 pagevec_release(&pvec);
 389                 cond_resched();
 390         }
 391 stop:
 392         if (nwritten)
 393                 f2fs_submit_merged_write(sbi, type);
 394
 395         blk_finish_plug(&plug);
 396
 397         return nwritten;
 398 }
 399
 400 static int f2fs_set_meta_page_dirty(struct page *page)
 401 {
 402         trace_f2fs_set_page_dirty(page, META);
 403
 404         if (!PageUptodate(page))
 405                 SetPageUptodate(page);
 406         if (!PageDirty(page)) {
 407                 __set_page_dirty_nobuffers(page);
 408                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 409                 f2fs_set_page_private(page, 0);
 410                 f2fs_trace_pid(page);
 411                 return 1;
 412         }
 413         return 0;
 414 }
 415
 416 const struct address_space_operations f2fs_meta_aops = {
 417         .writepage      = f2fs_write_meta_page,
 418         .writepages     = f2fs_write_meta_pages,
 419         .set_page_dirty = f2fs_set_meta_page_dirty,
 420         .invalidatepage = f2fs_invalidate_page,
 421         .releasepage    = f2fs_release_page,
 422 #ifdef CONFIG_MIGRATION
 423         .migratepage    = f2fs_migrate_page,
 424 #endif
 425 };
 426
 427 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino,
 428                                                 unsigned int devidx, int type)
 429 {
 430         struct inode_management *im = &sbi->im[type];
 431         struct ino_entry *e, *tmp;
 432
 433         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 434
 435         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 436
 437         spin_lock(&im->ino_lock);
 438         e = radix_tree_lookup(&im->ino_root, ino);
 439         if (!e) {
 440                 e = tmp;
 441                 if (unlikely(radix_tree_insert(&im->ino_root, ino, e)))
 442                         f2fs_bug_on(sbi, 1);
 443
 444                 memset(e, 0, sizeof(struct ino_entry));
 445                 e->ino = ino;
 446
 447                 list_add_tail(&e->list, &im->ino_list);
 448                 if (type != ORPHAN_INO)
 449                         im->ino_num++;
 450         }
 451
 452         if (type == FLUSH_INO)
 453                 f2fs_set_bit(devidx, (char *)&e->dirty_device);
 454
 455         spin_unlock(&im->ino_lock);
 456         radix_tree_preload_end();
 457
 458         if (e != tmp)
 459                 kmem_cache_free(ino_entry_slab, tmp);
 460 }
 461
 462 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 463 {
 464         struct inode_management *im = &sbi->im[type];
 465         struct ino_entry *e;
 466
 467         spin_lock(&im->ino_lock);
 468         e = radix_tree_lookup(&im->ino_root, ino);
 469         if (e) {
 470                 list_del(&e->list);
 471                 radix_tree_delete(&im->ino_root, ino);
 472                 im->ino_num--;
 473                 spin_unlock(&im->ino_lock);
 474                 kmem_cache_free(ino_entry_slab, e);
 475                 return;
 476         }
 477         spin_unlock(&im->ino_lock);
 478 }
 479
 480 void f2fs_add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 481 {
 482         /* add new dirty ino entry into list */
 483         __add_ino_entry(sbi, ino, 0, type);
 484 }
 485
 486 void f2fs_remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 487 {
 488         /* remove dirty ino entry from list */
 489         __remove_ino_entry(sbi, ino, type);
 490 }
 491
 492 /* mode should be APPEND_INO or UPDATE_INO */
 493 bool f2fs_exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 494 {
 495         struct inode_management *im = &sbi->im[mode];
 496         struct ino_entry *e;
 497
 498         spin_lock(&im->ino_lock);
 499         e = radix_tree_lookup(&im->ino_root, ino);
 500         spin_unlock(&im->ino_lock);
 501         return e ? true : false;
 502 }
 503
 504 void f2fs_release_ino_entry(struct f2fs_sb_info *sbi, bool all)
 505 {
 506         struct ino_entry *e, *tmp;
 507         int i;
 508
 509         for (i = all ? ORPHAN_INO : APPEND_INO; i < MAX_INO_ENTRY; i++) {
 510                 struct inode_management *im = &sbi->im[i];
 511
 512                 spin_lock(&im->ino_lock);
 513                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 514                         list_del(&e->list);
 515                         radix_tree_delete(&im->ino_root, e->ino);
 516                         kmem_cache_free(ino_entry_slab, e);
 517                         im->ino_num--;
 518                 }
 519                 spin_unlock(&im->ino_lock);
 520         }
 521 }
 522
 523 void f2fs_set_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 524                                         unsigned int devidx, int type)
 525 {
 526         __add_ino_entry(sbi, ino, devidx, type);
 527 }
 528
 529 bool f2fs_is_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 530                                         unsigned int devidx, int type)
 531 {
 532         struct inode_management *im = &sbi->im[type];
 533         struct ino_entry *e;
 534         bool is_dirty = false;
 535
 536         spin_lock(&im->ino_lock);
 537         e = radix_tree_lookup(&im->ino_root, ino);
 538         if (e && f2fs_test_bit(devidx, (char *)&e->dirty_device))
 539                 is_dirty = true;
 540         spin_unlock(&im->ino_lock);
 541         return is_dirty;
 542 }
 543
 544 int f2fs_acquire_orphan_inode(struct f2fs_sb_info *sbi)
 545 {
 546         struct inode_management *im = &sbi->im[ORPHAN_INO];
 547         int err = 0;
 548
 549         spin_lock(&im->ino_lock);
 550
 551         if (time_to_inject(sbi, FAULT_ORPHAN)) {
 552                 spin_unlock(&im->ino_lock);
 553                 f2fs_show_injection_info(FAULT_ORPHAN);
 554                 return -ENOSPC;
 555         }
 556
 557         if (unlikely(im->ino_num >= sbi->max_orphans))
 558                 err = -ENOSPC;
 559         else
 560                 im->ino_num++;
 561         spin_unlock(&im->ino_lock);
 562
 563         return err;
 564 }
 565
 566 void f2fs_release_orphan_inode(struct f2fs_sb_info *sbi)
 567 {
 568         struct inode_management *im = &sbi->im[ORPHAN_INO];
 569
 570         spin_lock(&im->ino_lock);
 571         f2fs_bug_on(sbi, im->ino_num == 0);
 572         im->ino_num--;
 573         spin_unlock(&im->ino_lock);
 574 }
 575
 576 void f2fs_add_orphan_inode(struct inode *inode)
 577 {
 578         /* add new orphan ino entry into list */
 579         __add_ino_entry(F2FS_I_SB(inode), inode->i_ino, 0, ORPHAN_INO);
 580         f2fs_update_inode_page(inode);
 581 }
 582
 583 void f2fs_remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 584 {
 585         /* remove orphan entry from orphan list */
 586         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 587 }
 588
 589 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 590 {
 591         struct inode *inode;
 592         struct node_info ni;
 593         int err;
 594
 595         inode = f2fs_iget_retry(sbi->sb, ino);
 596         if (IS_ERR(inode)) {
 597                 /*
 598                  * there should be a bug that we can't find the entry
 599                  * to orphan inode.
 600                  */
 601                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 602                 return PTR_ERR(inode);
 603         }
 604
 605         err = dquot_initialize(inode);
 606         if (err) {
 607                 iput(inode);
 608                 goto err_out;
 609         }
 610
 611         clear_nlink(inode);
 612
 613         /* truncate all the data during iput */
 614         iput(inode);
 615
 616         err = f2fs_get_node_info(sbi, ino, &ni);
 617         if (err)
 618                 goto err_out;
 619
 620         /* ENOMEM was fully retried in f2fs_evict_inode. */
 621         if (ni.blk_addr != NULL_ADDR) {
 622                 err = -EIO;
 623                 goto err_out;
 624         }
 625         return 0;
 626
 627 err_out:
 628         set_sbi_flag(sbi, SBI_NEED_FSCK);
 629         f2fs_msg(sbi->sb, KERN_WARNING,
 630                         "%s: orphan failed (ino=%x), run fsck to fix.",
 631                         __func__, ino);
 632         return err;
 633 }
 634
 635 int f2fs_recover_orphan_inodes(struct f2fs_sb_info *sbi)
 636 {
 637         block_t start_blk, orphan_blocks, i, j;
 638         unsigned int s_flags = sbi->sb->s_flags;
 639         int err = 0;
 640 #ifdef CONFIG_QUOTA
 641         int quota_enabled;
 642 #endif
 643
 644         if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG))
 645                 return 0;
 646
 647         if (s_flags & SB_RDONLY) {
 648                 f2fs_msg(sbi->sb, KERN_INFO, "orphan cleanup on readonly fs");
 649                 sbi->sb->s_flags &= ~SB_RDONLY;
 650         }
 651
 652 #ifdef CONFIG_QUOTA
 653         /* Needed for iput() to work correctly and not trash data */
 654         sbi->sb->s_flags |= SB_ACTIVE;
 655
 656         /*
 657          * Turn on quotas which were not enabled for read-only mounts if
 658          * filesystem has quota feature, so that they are updated correctly.
 659          */
 660         quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
 661 #endif
 662
 663         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 664         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 665
 666         f2fs_ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 667
 668         for (i = 0; i < orphan_blocks; i++) {
 669                 struct page *page;
 670                 struct f2fs_orphan_block *orphan_blk;
 671
 672                 page = f2fs_get_meta_page(sbi, start_blk + i);
 673                 if (IS_ERR(page)) {
 674                         err = PTR_ERR(page);
 675                         goto out;
 676                 }
 677
 678                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 679                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 680                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 681                         err = recover_orphan_inode(sbi, ino);
 682                         if (err) {
 683                                 f2fs_put_page(page, 1);
 684                                 goto out;
 685                         }
 686                 }
 687                 f2fs_put_page(page, 1);
 688         }
 689         /* clear Orphan Flag */
 690         clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG);
 691 out:
 692         set_sbi_flag(sbi, SBI_IS_RECOVERED);
 693
 694 #ifdef CONFIG_QUOTA
 695         /* Turn quotas off */
 696         if (quota_enabled)
 697                 f2fs_quota_off_umount(sbi->sb);
 698 #endif
 699         sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
 700
 701         return err;
 702 }
 703
 704 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 705 {
 706         struct list_head *head;
 707         struct f2fs_orphan_block *orphan_blk = NULL;
 708         unsigned int nentries = 0;
 709         unsigned short index = 1;
 710         unsigned short orphan_blocks;
 711         struct page *page = NULL;
 712         struct ino_entry *orphan = NULL;
 713         struct inode_management *im = &sbi->im[ORPHAN_INO];
 714
 715         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 716
 717         /*
 718          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 719          * orphan inode operations are covered under f2fs_lock_op().
 720          * And, spin_lock should be avoided due to page operations below.
 721          */
 722         head = &im->ino_list;
 723
 724         /* loop for each orphan inode entry and write them in Jornal block */
 725         list_for_each_entry(orphan, head, list) {
 726                 if (!page) {
 727                         page = f2fs_grab_meta_page(sbi, start_blk++);
 728                         orphan_blk =
 729                                 (struct f2fs_orphan_block *)page_address(page);
 730                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 731                 }
 732
 733                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 734
 735                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 736                         /*
 737                          * an orphan block is full of 1020 entries,
 738                          * then we need to flush current orphan blocks
 739                          * and bring another one in memory
 740                          */
 741                         orphan_blk->blk_addr = cpu_to_le16(index);
 742                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 743                         orphan_blk->entry_count = cpu_to_le32(nentries);
 744                         set_page_dirty(page);
 745                         f2fs_put_page(page, 1);
 746                         index++;
 747                         nentries = 0;
 748                         page = NULL;
 749                 }
 750         }
 751
 752         if (page) {
 753                 orphan_blk->blk_addr = cpu_to_le16(index);
 754                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 755                 orphan_blk->entry_count = cpu_to_le32(nentries);
 756                 set_page_dirty(page);
 757                 f2fs_put_page(page, 1);
 758         }
 759 }
 760
 761 static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
 762                 struct f2fs_checkpoint **cp_block, struct page **cp_page,
 763                 unsigned long long *version)
 764 {
 765         unsigned long blk_size = sbi->blocksize;
 766         size_t crc_offset = 0;
 767         __u32 crc = 0;
 768
 769         *cp_page = f2fs_get_meta_page(sbi, cp_addr);
 770         if (IS_ERR(*cp_page))
 771                 return PTR_ERR(*cp_page);
 772
 773         *cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
 774
 775         crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
 776         if (crc_offset > (blk_size - sizeof(__le32))) {
 777                 f2fs_put_page(*cp_page, 1);
 778                 f2fs_msg(sbi->sb, KERN_WARNING,
 779                         "invalid crc_offset: %zu", crc_offset);
 780                 return -EINVAL;
 781         }
 782
 783         crc = cur_cp_crc(*cp_block);
 784         if (!f2fs_crc_valid(sbi, crc, *cp_block, crc_offset)) {
 785                 f2fs_put_page(*cp_page, 1);
 786                 f2fs_msg(sbi->sb, KERN_WARNING, "invalid crc value");
 787                 return -EINVAL;
 788         }
 789
 790         *version = cur_cp_version(*cp_block);
 791         return 0;
 792 }
 793
 794 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 795                                 block_t cp_addr, unsigned long long *version)
 796 {
 797         struct page *cp_page_1 = NULL, *cp_page_2 = NULL;
 798         struct f2fs_checkpoint *cp_block = NULL;
 799         unsigned long long cur_version = 0, pre_version = 0;
 800         int err;
 801
 802         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 803                                         &cp_page_1, version);
 804         if (err)
 805                 return NULL;
 806
 807         if (le32_to_cpu(cp_block->cp_pack_total_block_count) >
 808                                         sbi->blocks_per_seg) {
 809                 f2fs_msg(sbi->sb, KERN_WARNING,
 810                         "invalid cp_pack_total_block_count:%u",
 811                         le32_to_cpu(cp_block->cp_pack_total_block_count));
 812                 goto invalid_cp;
 813         }
 814         pre_version = *version;
 815
 816         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 817         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 818                                         &cp_page_2, version);
 819         if (err)
 820                 goto invalid_cp;
 821         cur_version = *version;
 822
 823         if (cur_version == pre_version) {
 824                 *version = cur_version;
 825                 f2fs_put_page(cp_page_2, 1);
 826                 return cp_page_1;
 827         }
 828         f2fs_put_page(cp_page_2, 1);
 829 invalid_cp:
 830         f2fs_put_page(cp_page_1, 1);
 831         return NULL;
 832 }
 833
 834 int f2fs_get_valid_checkpoint(struct f2fs_sb_info *sbi)
 835 {
 836         struct f2fs_checkpoint *cp_block;
 837         struct f2fs_super_block *fsb = sbi->raw_super;
 838         struct page *cp1, *cp2, *cur_page;
 839         unsigned long blk_size = sbi->blocksize;
 840         unsigned long long cp1_version = 0, cp2_version = 0;
 841         unsigned long long cp_start_blk_no;
 842         unsigned int cp_blks = 1 + __cp_payload(sbi);
 843         block_t cp_blk_no;
 844         int i;
 845
 846         sbi->ckpt = f2fs_kzalloc(sbi, array_size(blk_size, cp_blks),
 847                                  GFP_KERNEL);
 848         if (!sbi->ckpt)
 849                 return -ENOMEM;
 850         /*
 851          * Finding out valid cp block involves read both
 852          * sets( cp pack1 and cp pack 2)
 853          */
 854         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 855         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 856
 857         /* The second checkpoint pack should start at the next segment */
 858         cp_start_blk_no += ((unsigned long long)1) <<
 859                                 le32_to_cpu(fsb->log_blocks_per_seg);
 860         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 861
 862         if (cp1 && cp2) {
 863                 if (ver_after(cp2_version, cp1_version))
 864                         cur_page = cp2;
 865                 else
 866                         cur_page = cp1;
 867         } else if (cp1) {
 868                 cur_page = cp1;
 869         } else if (cp2) {
 870                 cur_page = cp2;
 871         } else {
 872                 goto fail_no_cp;
 873         }
 874
 875         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 876         memcpy(sbi->ckpt, cp_block, blk_size);
 877
 878         if (cur_page == cp1)
 879                 sbi->cur_cp_pack = 1;
 880         else
 881                 sbi->cur_cp_pack = 2;
 882
 883         /* Sanity checking of checkpoint */
 884         if (f2fs_sanity_check_ckpt(sbi))
 885                 goto free_fail_no_cp;
 886
 887         if (cp_blks <= 1)
 888                 goto done;
 889
 890         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 891         if (cur_page == cp2)
 892                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 893
 894         for (i = 1; i < cp_blks; i++) {
 895                 void *sit_bitmap_ptr;
 896                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 897
 898                 cur_page = f2fs_get_meta_page(sbi, cp_blk_no + i);
 899                 if (IS_ERR(cur_page))
 900                         goto free_fail_no_cp;
 901                 sit_bitmap_ptr = page_address(cur_page);
 902                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 903                 f2fs_put_page(cur_page, 1);
 904         }
 905 done:
 906         f2fs_put_page(cp1, 1);
 907         f2fs_put_page(cp2, 1);
 908         return 0;
 909
 910 free_fail_no_cp:
 911         f2fs_put_page(cp1, 1);
 912         f2fs_put_page(cp2, 1);
 913 fail_no_cp:
 914         kvfree(sbi->ckpt);
 915         return -EINVAL;
 916 }
 917
 918 static void __add_dirty_inode(struct inode *inode, enum inode_type type)
 919 {
 920         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 921         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 922
 923         if (is_inode_flag_set(inode, flag))
 924                 return;
 925
 926         set_inode_flag(inode, flag);
 927         if (!f2fs_is_volatile_file(inode))
 928                 list_add_tail(&F2FS_I(inode)->dirty_list,
 929                                                 &sbi->inode_list[type]);
 930         stat_inc_dirty_inode(sbi, type);
 931 }
 932
 933 static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
 934 {
 935         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 936
 937         if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
 938                 return;
 939
 940         list_del_init(&F2FS_I(inode)->dirty_list);
 941         clear_inode_flag(inode, flag);
 942         stat_dec_dirty_inode(F2FS_I_SB(inode), type);
 943 }
 944
 945 void f2fs_update_dirty_page(struct inode *inode, struct page *page)
 946 {
 947         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 948         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 949
 950         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 951                         !S_ISLNK(inode->i_mode))
 952                 return;
 953
 954         spin_lock(&sbi->inode_lock[type]);
 955         if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
 956                 __add_dirty_inode(inode, type);
 957         inode_inc_dirty_pages(inode);
 958         spin_unlock(&sbi->inode_lock[type]);
 959
 960         f2fs_set_page_private(page, 0);
 961         f2fs_trace_pid(page);
 962 }
 963
 964 void f2fs_remove_dirty_inode(struct inode *inode)
 965 {
 966         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 967         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 968
 969         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 970                         !S_ISLNK(inode->i_mode))
 971                 return;
 972
 973         if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
 974                 return;
 975
 976         spin_lock(&sbi->inode_lock[type]);
 977         __remove_dirty_inode(inode, type);
 978         spin_unlock(&sbi->inode_lock[type]);
 979 }
 980
 981 int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
 982 {
 983         struct list_head *head;
 984         struct inode *inode;
 985         struct f2fs_inode_info *fi;
 986         bool is_dir = (type == DIR_INODE);
 987         unsigned long ino = 0;
 988
 989         trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
 990                                 get_pages(sbi, is_dir ?
 991                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 992 retry:
 993         if (unlikely(f2fs_cp_error(sbi)))
 994                 return -EIO;
 995
 996         spin_lock(&sbi->inode_lock[type]);
 997
 998         head = &sbi->inode_list[type];
 999         if (list_empty(head)) {
1000                 spin_unlock(&sbi->inode_lock[type]);
1001                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
1002                                 get_pages(sbi, is_dir ?
1003                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1004                 return 0;
1005         }
1006         fi = list_first_entry(head, struct f2fs_inode_info, dirty_list);
1007         inode = igrab(&fi->vfs_inode);
1008         spin_unlock(&sbi->inode_lock[type]);
1009         if (inode) {
1010                 unsigned long cur_ino = inode->i_ino;
1011
1012                 if (is_dir)
1013                         F2FS_I(inode)->cp_task = current;
1014
1015                 filemap_fdatawrite(inode->i_mapping);
1016
1017                 if (is_dir)
1018                         F2FS_I(inode)->cp_task = NULL;
1019
1020                 iput(inode);
1021                 /* We need to give cpu to another writers. */
1022                 if (ino == cur_ino)
1023                         cond_resched();
1024                 else
1025                         ino = cur_ino;
1026         } else {
1027                 /*
1028                  * We should submit bio, since it exists several
1029                  * wribacking dentry pages in the freeing inode.
1030                  */
1031                 f2fs_submit_merged_write(sbi, DATA);
1032                 cond_resched();
1033         }
1034         goto retry;
1035 }
1036
1037 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
1038 {
1039         struct list_head *head = &sbi->inode_list[DIRTY_META];
1040         struct inode *inode;
1041         struct f2fs_inode_info *fi;
1042         s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
1043
1044         while (total--) {
1045                 if (unlikely(f2fs_cp_error(sbi)))
1046                         return -EIO;
1047
1048                 spin_lock(&sbi->inode_lock[DIRTY_META]);
1049                 if (list_empty(head)) {
1050                         spin_unlock(&sbi->inode_lock[DIRTY_META]);
1051                         return 0;
1052                 }
1053                 fi = list_first_entry(head, struct f2fs_inode_info,
1054                                                         gdirty_list);
1055                 inode = igrab(&fi->vfs_inode);
1056                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
1057                 if (inode) {
1058                         sync_inode_metadata(inode, 0);
1059
1060                         /* it's on eviction */
1061                         if (is_inode_flag_set(inode, FI_DIRTY_INODE))
1062                                 f2fs_update_inode_page(inode);
1063                         iput(inode);
1064                 }
1065         }
1066         return 0;
1067 }
1068
1069 static void __prepare_cp_block(struct f2fs_sb_info *sbi)
1070 {
1071         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1072         struct f2fs_nm_info *nm_i = NM_I(sbi);
1073         nid_t last_nid = nm_i->next_scan_nid;
1074
1075         next_free_nid(sbi, &last_nid);
1076         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
1077         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
1078         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
1079         ckpt->next_free_nid = cpu_to_le32(last_nid);
1080 }
1081
1082 static bool __need_flush_quota(struct f2fs_sb_info *sbi)
1083 {
1084         if (!is_journalled_quota(sbi))
1085                 return false;
1086         if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH))
1087                 return false;
1088         if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR))
1089                 return false;
1090         if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_FLUSH))
1091                 return true;
1092         if (get_pages(sbi, F2FS_DIRTY_QDATA))
1093                 return true;
1094         return false;
1095 }
1096
1097 /*
1098  * Freeze all the FS-operations for checkpoint.
1099  */
1100 static int block_operations(struct f2fs_sb_info *sbi)
1101 {
1102         struct writeback_control wbc = {
1103                 .sync_mode = WB_SYNC_ALL,
1104                 .nr_to_write = LONG_MAX,
1105                 .for_reclaim = 0,
1106         };
1107         struct blk_plug plug;
1108         int err = 0, cnt = 0;
1109
1110         blk_start_plug(&plug);
1111
1112 retry_flush_quotas:
1113         if (__need_flush_quota(sbi)) {
1114                 int locked;
1115
1116                 if (++cnt > DEFAULT_RETRY_QUOTA_FLUSH_COUNT) {
1117                         set_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
1118                         f2fs_lock_all(sbi);
1119                         goto retry_flush_dents;
1120                 }
1121                 clear_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
1122
1123                 /* only failed during mount/umount/freeze/quotactl */
1124                 locked = down_read_trylock(&sbi->sb->s_umount);
1125                 f2fs_quota_sync(sbi->sb, -1);
1126                 if (locked)
1127                         up_read(&sbi->sb->s_umount);
1128         }
1129
1130         f2fs_lock_all(sbi);
1131         if (__need_flush_quota(sbi)) {
1132                 f2fs_unlock_all(sbi);
1133                 cond_resched();
1134                 goto retry_flush_quotas;
1135         }
1136
1137 retry_flush_dents:
1138         /* write all the dirty dentry pages */
1139         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
1140                 f2fs_unlock_all(sbi);
1141                 err = f2fs_sync_dirty_inodes(sbi, DIR_INODE);
1142                 if (err)
1143                         goto out;
1144                 cond_resched();
1145                 goto retry_flush_quotas;
1146         }
1147
1148         /*
1149          * POR: we should ensure that there are no dirty node pages
1150          * until finishing nat/sit flush. inode->i_blocks can be updated.
1151          */
1152         down_write(&sbi->node_change);
1153
1154         if (__need_flush_quota(sbi)) {
1155                 up_write(&sbi->node_change);
1156                 f2fs_unlock_all(sbi);
1157                 goto retry_flush_quotas;
1158         }
1159
1160         if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
1161                 up_write(&sbi->node_change);
1162                 f2fs_unlock_all(sbi);
1163                 err = f2fs_sync_inode_meta(sbi);
1164                 if (err)
1165                         goto out;
1166                 cond_resched();
1167                 goto retry_flush_quotas;
1168         }
1169
1170 retry_flush_nodes:
1171         down_write(&sbi->node_write);
1172
1173         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
1174                 up_write(&sbi->node_write);
1175                 atomic_inc(&sbi->wb_sync_req[NODE]);
1176                 err = f2fs_sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO);
1177                 atomic_dec(&sbi->wb_sync_req[NODE]);
1178                 if (err) {
1179                         up_write(&sbi->node_change);
1180                         f2fs_unlock_all(sbi);
1181                         goto out;
1182                 }
1183                 cond_resched();
1184                 goto retry_flush_nodes;
1185         }
1186
1187         /*
1188          * sbi->node_change is used only for AIO write_begin path which produces
1189          * dirty node blocks and some checkpoint values by block allocation.
1190          */
1191         __prepare_cp_block(sbi);
1192         up_write(&sbi->node_change);
1193 out:
1194         blk_finish_plug(&plug);
1195         return err;
1196 }
1197
1198 static void unblock_operations(struct f2fs_sb_info *sbi)
1199 {
1200         up_write(&sbi->node_write);
1201         f2fs_unlock_all(sbi);
1202 }
1203
1204 void f2fs_wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
1205 {
1206         DEFINE_WAIT(wait);
1207
1208         for (;;) {
1209                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
1210
1211                 if (!get_pages(sbi, F2FS_WB_CP_DATA))
1212                         break;
1213
1214                 if (unlikely(f2fs_cp_error(sbi)))
1215                         break;
1216
1217                 io_schedule_timeout(5*HZ);
1218         }
1219         finish_wait(&sbi->cp_wait, &wait);
1220 }
1221
1222 static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1223 {
1224         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
1225         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1226         unsigned long flags;
1227
1228         spin_lock_irqsave(&sbi->cp_lock, flags);
1229
1230         if ((cpc->reason & CP_UMOUNT) &&
1231                         le32_to_cpu(ckpt->cp_pack_total_block_count) >
1232                         sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks)
1233                 disable_nat_bits(sbi, false);
1234
1235         if (cpc->reason & CP_TRIMMED)
1236                 __set_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1237         else
1238                 __clear_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1239
1240         if (cpc->reason & CP_UMOUNT)
1241                 __set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1242         else
1243                 __clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1244
1245         if (cpc->reason & CP_FASTBOOT)
1246                 __set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1247         else
1248                 __clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1249
1250         if (orphan_num)
1251                 __set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1252         else
1253                 __clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1254
1255         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1256                 __set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1257
1258         if (is_sbi_flag_set(sbi, SBI_CP_DISABLED))
1259                 __set_ckpt_flags(ckpt, CP_DISABLED_FLAG);
1260         else
1261                 __clear_ckpt_flags(ckpt, CP_DISABLED_FLAG);
1262
1263         if (is_sbi_flag_set(sbi, SBI_CP_DISABLED_QUICK))
1264                 __set_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
1265         else
1266                 __clear_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
1267
1268         if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH))
1269                 __set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
1270         /*
1271          * TODO: we count on fsck.f2fs to clear this flag until we figure out
1272          * missing cases which clear it incorrectly.
1273          */
1274
1275         if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR))
1276                 __set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
1277
1278         /* set this flag to activate crc|cp_ver for recovery */
1279         __set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
1280         __clear_ckpt_flags(ckpt, CP_NOCRC_RECOVERY_FLAG);
1281
1282         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1283 }
1284
1285 static void commit_checkpoint(struct f2fs_sb_info *sbi,
1286         void *src, block_t blk_addr)
1287 {
1288         struct writeback_control wbc = {
1289                 .for_reclaim = 0,
1290         };
1291
1292         /*
1293          * pagevec_lookup_tag and lock_page again will take
1294          * some extra time. Therefore, f2fs_update_meta_pages and
1295          * f2fs_sync_meta_pages are combined in this function.
1296          */
1297         struct page *page = f2fs_grab_meta_page(sbi, blk_addr);
1298         int err;
1299
1300         f2fs_wait_on_page_writeback(page, META, true, true);
1301
1302         memcpy(page_address(page), src, PAGE_SIZE);
1303
1304         set_page_dirty(page);
1305         if (unlikely(!clear_page_dirty_for_io(page)))
1306                 f2fs_bug_on(sbi, 1);
1307
1308         /* writeout cp pack 2 page */
1309         err = __f2fs_write_meta_page(page, &wbc, FS_CP_META_IO);
1310         if (unlikely(err && f2fs_cp_error(sbi))) {
1311                 f2fs_put_page(page, 1);
1312                 return;
1313         }
1314
1315         f2fs_bug_on(sbi, err);
1316         f2fs_put_page(page, 0);
1317
1318         /* submit checkpoint (with barrier if NOBARRIER is not set) */
1319         f2fs_submit_merged_write(sbi, META_FLUSH);
1320 }
1321
1322 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1323 {
1324         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1325         struct f2fs_nm_info *nm_i = NM_I(sbi);
1326         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num, flags;
1327         block_t start_blk;
1328         unsigned int data_sum_blocks, orphan_blocks;
1329         __u32 crc32 = 0;
1330         int i;
1331         int cp_payload_blks = __cp_payload(sbi);
1332         struct super_block *sb = sbi->sb;
1333         struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
1334         u64 kbytes_written;
1335         int err;
1336
1337         /* Flush all the NAT/SIT pages */
1338         f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1339         f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_META) &&
1340                                         !f2fs_cp_error(sbi));
1341
1342         /*
1343          * modify checkpoint
1344          * version number is already updated
1345          */
1346         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi, true));
1347         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
1348         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
1349                 ckpt->cur_node_segno[i] =
1350                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
1351                 ckpt->cur_node_blkoff[i] =
1352                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
1353                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
1354                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
1355         }
1356         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
1357                 ckpt->cur_data_segno[i] =
1358                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
1359                 ckpt->cur_data_blkoff[i] =
1360                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
1361                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
1362                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
1363         }
1364
1365         /* 2 cp  + n data seg summary + orphan inode blocks */
1366         data_sum_blocks = f2fs_npages_for_summary_flush(sbi, false);
1367         spin_lock_irqsave(&sbi->cp_lock, flags);
1368         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
1369                 __set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1370         else
1371                 __clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1372         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1373
1374         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
1375         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
1376                         orphan_blocks);
1377
1378         if (__remain_node_summaries(cpc->reason))
1379                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
1380                                 cp_payload_blks + data_sum_blocks +
1381                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
1382         else
1383                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1384                                 cp_payload_blks + data_sum_blocks +
1385                                 orphan_blocks);
1386
1387         /* update ckpt flag for checkpoint */
1388         update_ckpt_flags(sbi, cpc);
1389
1390         /* update SIT/NAT bitmap */
1391         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1392         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1393
1394         crc32 = f2fs_crc32(sbi, ckpt, le32_to_cpu(ckpt->checksum_offset));
1395         *((__le32 *)((unsigned char *)ckpt +
1396                                 le32_to_cpu(ckpt->checksum_offset)))
1397                                 = cpu_to_le32(crc32);
1398
1399         start_blk = __start_cp_next_addr(sbi);
1400
1401         /* write nat bits */
1402         if (enabled_nat_bits(sbi, cpc)) {
1403                 __u64 cp_ver = cur_cp_version(ckpt);
1404                 block_t blk;
1405
1406                 cp_ver |= ((__u64)crc32 << 32);
1407                 *(__le64 *)nm_i->nat_bits = cpu_to_le64(cp_ver);
1408
1409                 blk = start_blk + sbi->blocks_per_seg - nm_i->nat_bits_blocks;
1410                 for (i = 0; i < nm_i->nat_bits_blocks; i++)
1411                         f2fs_update_meta_page(sbi, nm_i->nat_bits +
1412                                         (i << F2FS_BLKSIZE_BITS), blk + i);
1413         }
1414
1415         /* write out checkpoint buffer at block 0 */
1416         f2fs_update_meta_page(sbi, ckpt, start_blk++);
1417
1418         for (i = 1; i < 1 + cp_payload_blks; i++)
1419                 f2fs_update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1420                                                         start_blk++);
1421
1422         if (orphan_num) {
1423                 write_orphan_inodes(sbi, start_blk);
1424                 start_blk += orphan_blocks;
1425         }
1426
1427         f2fs_write_data_summaries(sbi, start_blk);
1428         start_blk += data_sum_blocks;
1429
1430         /* Record write statistics in the hot node summary */
1431         kbytes_written = sbi->kbytes_written;
1432         if (sb->s_bdev->bd_part)
1433                 kbytes_written += BD_PART_WRITTEN(sbi);
1434
1435         seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
1436
1437         if (__remain_node_summaries(cpc->reason)) {
1438                 f2fs_write_node_summaries(sbi, start_blk);
1439                 start_blk += NR_CURSEG_NODE_TYPE;
1440         }
1441
1442         /* update user_block_counts */
1443         sbi->last_valid_block_count = sbi->total_valid_block_count;
1444         percpu_counter_set(&sbi->alloc_valid_block_count, 0);
1445
1446         /* Here, we have one bio having CP pack except cp pack 2 page */
1447         f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1448         f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_META) &&
1449                                         !f2fs_cp_error(sbi));
1450
1451         /* wait for previous submitted meta pages writeback */
1452         f2fs_wait_on_all_pages_writeback(sbi);
1453
1454         /* flush all device cache */
1455         err = f2fs_flush_device_cache(sbi);
1456         if (err)
1457                 return err;
1458
1459         /* barrier and flush checkpoint cp pack 2 page if it can */
1460         commit_checkpoint(sbi, ckpt, start_blk);
1461         f2fs_wait_on_all_pages_writeback(sbi);
1462
1463         /*
1464          * invalidate intermediate page cache borrowed from meta inode
1465          * which are used for migration of encrypted inode's blocks.
1466          */
1467         if (f2fs_sb_has_encrypt(sbi))
1468                 invalidate_mapping_pages(META_MAPPING(sbi),
1469                                 MAIN_BLKADDR(sbi), MAX_BLKADDR(sbi) - 1);
1470
1471         f2fs_release_ino_entry(sbi, false);
1472
1473         f2fs_reset_fsync_node_info(sbi);
1474
1475         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1476         clear_sbi_flag(sbi, SBI_NEED_CP);
1477         clear_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
1478         sbi->unusable_block_count = 0;
1479         __set_cp_next_pack(sbi);
1480
1481         /*
1482          * redirty superblock if metadata like node page or inode cache is
1483          * updated during writing checkpoint.
1484          */
1485         if (get_pages(sbi, F2FS_DIRTY_NODES) ||
1486                         get_pages(sbi, F2FS_DIRTY_IMETA))
1487                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1488
1489         f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS));
1490
1491         return unlikely(f2fs_cp_error(sbi)) ? -EIO : 0;
1492 }
1493
1494 /*
1495  * We guarantee that this checkpoint procedure will not fail.
1496  */
1497 int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1498 {
1499         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1500         unsigned long long ckpt_ver;
1501         int err = 0;
1502
1503         if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
1504                 if (cpc->reason != CP_PAUSE)
1505                         return 0;
1506                 f2fs_msg(sbi->sb, KERN_WARNING,
1507                                 "Start checkpoint disabled!");
1508         }
1509         mutex_lock(&sbi->cp_mutex);
1510
1511         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1512                 ((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) ||
1513                 ((cpc->reason & CP_DISCARD) && !sbi->discard_blks)))
1514                 goto out;
1515         if (unlikely(f2fs_cp_error(sbi))) {
1516                 err = -EIO;
1517                 goto out;
1518         }
1519         if (f2fs_readonly(sbi->sb)) {
1520                 err = -EROFS;
1521                 goto out;
1522         }
1523
1524         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1525
1526         err = block_operations(sbi);
1527         if (err)
1528                 goto out;
1529
1530         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1531
1532         f2fs_flush_merged_writes(sbi);
1533
1534         /* this is the case of multiple fstrims without any changes */
1535         if (cpc->reason & CP_DISCARD) {
1536                 if (!f2fs_exist_trim_candidates(sbi, cpc)) {
1537                         unblock_operations(sbi);
1538                         goto out;
1539                 }
1540
1541                 if (NM_I(sbi)->dirty_nat_cnt == 0 &&
1542                                 SIT_I(sbi)->dirty_sentries == 0 &&
1543                                 prefree_segments(sbi) == 0) {
1544                         f2fs_flush_sit_entries(sbi, cpc);
1545                         f2fs_clear_prefree_segments(sbi, cpc);
1546                         unblock_operations(sbi);
1547                         goto out;
1548                 }
1549         }
1550
1551         /*
1552          * update checkpoint pack index
1553          * Increase the version number so that
1554          * SIT entries and seg summaries are written at correct place
1555          */
1556         ckpt_ver = cur_cp_version(ckpt);
1557         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1558
1559         /* write cached NAT/SIT entries to NAT/SIT area */
1560         err = f2fs_flush_nat_entries(sbi, cpc);
1561         if (err)
1562                 goto stop;
1563
1564         f2fs_flush_sit_entries(sbi, cpc);
1565
1566         /* unlock all the fs_lock[] in do_checkpoint() */
1567         err = do_checkpoint(sbi, cpc);
1568         if (err)
1569                 f2fs_release_discard_addrs(sbi);
1570         else
1571                 f2fs_clear_prefree_segments(sbi, cpc);
1572 stop:
1573         unblock_operations(sbi);
1574         stat_inc_cp_count(sbi->stat_info);
1575
1576         if (cpc->reason & CP_RECOVERY)
1577                 f2fs_msg(sbi->sb, KERN_NOTICE,
1578                         "checkpoint: version = %llx", ckpt_ver);
1579
1580         /* do checkpoint periodically */
1581         f2fs_update_time(sbi, CP_TIME);
1582         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1583 out:
1584         mutex_unlock(&sbi->cp_mutex);
1585         return err;
1586 }
1587
1588 void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi)
1589 {
1590         int i;
1591
1592         for (i = 0; i < MAX_INO_ENTRY; i++) {
1593                 struct inode_management *im = &sbi->im[i];
1594
1595                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1596                 spin_lock_init(&im->ino_lock);
1597                 INIT_LIST_HEAD(&im->ino_list);
1598                 im->ino_num = 0;
1599         }
1600
1601         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1602                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1603                                 F2FS_ORPHANS_PER_BLOCK;
1604 }
1605
1606 int __init f2fs_create_checkpoint_caches(void)
1607 {
1608         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1609                         sizeof(struct ino_entry));
1610         if (!ino_entry_slab)
1611                 return -ENOMEM;
1612         f2fs_inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1613                         sizeof(struct inode_entry));
1614         if (!f2fs_inode_entry_slab) {
1615                 kmem_cache_destroy(ino_entry_slab);
1616                 return -ENOMEM;
1617         }
1618         return 0;
1619 }
1620
1621 void f2fs_destroy_checkpoint_caches(void)
1622 {
1623         kmem_cache_destroy(ino_entry_slab);
1624         kmem_cache_destroy(f2fs_inode_entry_slab);
1625 }