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 #include <linux/kthread.h>
  17
  18 #include "f2fs.h"
  19 #include "node.h"
  20 #include "segment.h"
  21 #include <trace/events/f2fs.h>
  22
  23 #define DEFAULT_CHECKPOINT_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
  24
  25 static struct kmem_cache *ino_entry_slab;
  26 struct kmem_cache *f2fs_inode_entry_slab;
  27
  28 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
  29 {
  30         f2fs_build_fault_attr(sbi, 0, 0);
  31         set_ckpt_flags(sbi, CP_ERROR_FLAG);
  32         if (!end_io)
  33                 f2fs_flush_merged_writes(sbi);
  34 }
  35
  36 /*
  37  * We guarantee no failure on the returned page.
  38  */
  39 struct page *f2fs_grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  40 {
  41         struct address_space *mapping = META_MAPPING(sbi);
  42         struct page *page;
  43 repeat:
  44         page = f2fs_grab_cache_page(mapping, index, false);
  45         if (!page) {
  46                 cond_resched();
  47                 goto repeat;
  48         }
  49         f2fs_wait_on_page_writeback(page, META, true, true);
  50         if (!PageUptodate(page))
  51                 SetPageUptodate(page);
  52         return page;
  53 }
  54
  55 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
  56                                                         bool is_meta)
  57 {
  58         struct address_space *mapping = META_MAPPING(sbi);
  59         struct page *page;
  60         struct f2fs_io_info fio = {
  61                 .sbi = sbi,
  62                 .type = META,
  63                 .op = REQ_OP_READ,
  64                 .op_flags = REQ_META | REQ_PRIO,
  65                 .old_blkaddr = index,
  66                 .new_blkaddr = index,
  67                 .encrypted_page = NULL,
  68                 .is_por = !is_meta,
  69         };
  70         int err;
  71
  72         if (unlikely(!is_meta))
  73                 fio.op_flags &= ~REQ_META;
  74 repeat:
  75         page = f2fs_grab_cache_page(mapping, index, false);
  76         if (!page) {
  77                 cond_resched();
  78                 goto repeat;
  79         }
  80         if (PageUptodate(page))
  81                 goto out;
  82
  83         fio.page = page;
  84
  85         err = f2fs_submit_page_bio(&fio);
  86         if (err) {
  87                 f2fs_put_page(page, 1);
  88                 return ERR_PTR(err);
  89         }
  90
  91         f2fs_update_iostat(sbi, FS_META_READ_IO, F2FS_BLKSIZE);
  92
  93         lock_page(page);
  94         if (unlikely(page->mapping != mapping)) {
  95                 f2fs_put_page(page, 1);
  96                 goto repeat;
  97         }
  98
  99         if (unlikely(!PageUptodate(page))) {
 100                 f2fs_put_page(page, 1);
 101                 return ERR_PTR(-EIO);
 102         }
 103 out:
 104         return page;
 105 }
 106
 107 struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 108 {
 109         return __get_meta_page(sbi, index, true);
 110 }
 111
 112 struct page *f2fs_get_meta_page_retry(struct f2fs_sb_info *sbi, pgoff_t index)
 113 {
 114         struct page *page;
 115         int count = 0;
 116
 117 retry:
 118         page = __get_meta_page(sbi, index, true);
 119         if (IS_ERR(page)) {
 120                 if (PTR_ERR(page) == -EIO &&
 121                                 ++count <= DEFAULT_RETRY_IO_COUNT)
 122                         goto retry;
 123                 f2fs_stop_checkpoint(sbi, false);
 124         }
 125         return page;
 126 }
 127
 128 /* for POR only */
 129 struct page *f2fs_get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 130 {
 131         return __get_meta_page(sbi, index, false);
 132 }
 133
 134 static bool __is_bitmap_valid(struct f2fs_sb_info *sbi, block_t blkaddr,
 135                                                         int type)
 136 {
 137         struct seg_entry *se;
 138         unsigned int segno, offset;
 139         bool exist;
 140
 141         if (type != DATA_GENERIC_ENHANCE && type != DATA_GENERIC_ENHANCE_READ)
 142                 return true;
 143
 144         segno = GET_SEGNO(sbi, blkaddr);
 145         offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 146         se = get_seg_entry(sbi, segno);
 147
 148         exist = f2fs_test_bit(offset, se->cur_valid_map);
 149         if (!exist && type == DATA_GENERIC_ENHANCE) {
 150                 f2fs_err(sbi, "Inconsistent error blkaddr:%u, sit bitmap:%d",
 151                          blkaddr, exist);
 152                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 153                 WARN_ON(1);
 154         }
 155         return exist;
 156 }
 157
 158 bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
 159                                         block_t blkaddr, int type)
 160 {
 161         switch (type) {
 162         case META_NAT:
 163                 break;
 164         case META_SIT:
 165                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 166                         return false;
 167                 break;
 168         case META_SSA:
 169                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 170                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 171                         return false;
 172                 break;
 173         case META_CP:
 174                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 175                         blkaddr < __start_cp_addr(sbi)))
 176                         return false;
 177                 break;
 178         case META_POR:
 179                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 180                         blkaddr < MAIN_BLKADDR(sbi)))
 181                         return false;
 182                 break;
 183         case DATA_GENERIC:
 184         case DATA_GENERIC_ENHANCE:
 185         case DATA_GENERIC_ENHANCE_READ:
 186                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 187                                 blkaddr < MAIN_BLKADDR(sbi))) {
 188                         f2fs_warn(sbi, "access invalid blkaddr:%u",
 189                                   blkaddr);
 190                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 191                         WARN_ON(1);
 192                         return false;
 193                 } else {
 194                         return __is_bitmap_valid(sbi, blkaddr, type);
 195                 }
 196                 break;
 197         case META_GENERIC:
 198                 if (unlikely(blkaddr < SEG0_BLKADDR(sbi) ||
 199                         blkaddr >= MAIN_BLKADDR(sbi)))
 200                         return false;
 201                 break;
 202         default:
 203                 BUG();
 204         }
 205
 206         return true;
 207 }
 208
 209 /*
 210  * Readahead CP/NAT/SIT/SSA/POR pages
 211  */
 212 int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 213                                                         int type, bool sync)
 214 {
 215         struct page *page;
 216         block_t blkno = start;
 217         struct f2fs_io_info fio = {
 218                 .sbi = sbi,
 219                 .type = META,
 220                 .op = REQ_OP_READ,
 221                 .op_flags = sync ? (REQ_META | REQ_PRIO) : REQ_RAHEAD,
 222                 .encrypted_page = NULL,
 223                 .in_list = false,
 224                 .is_por = (type == META_POR),
 225         };
 226         struct blk_plug plug;
 227         int err;
 228
 229         if (unlikely(type == META_POR))
 230                 fio.op_flags &= ~REQ_META;
 231
 232         blk_start_plug(&plug);
 233         for (; nrpages-- > 0; blkno++) {
 234
 235                 if (!f2fs_is_valid_blkaddr(sbi, blkno, type))
 236                         goto out;
 237
 238                 switch (type) {
 239                 case META_NAT:
 240                         if (unlikely(blkno >=
 241                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 242                                 blkno = 0;
 243                         /* get nat block addr */
 244                         fio.new_blkaddr = current_nat_addr(sbi,
 245                                         blkno * NAT_ENTRY_PER_BLOCK);
 246                         break;
 247                 case META_SIT:
 248                         if (unlikely(blkno >= TOTAL_SEGS(sbi)))
 249                                 goto out;
 250                         /* get sit block addr */
 251                         fio.new_blkaddr = current_sit_addr(sbi,
 252                                         blkno * SIT_ENTRY_PER_BLOCK);
 253                         break;
 254                 case META_SSA:
 255                 case META_CP:
 256                 case META_POR:
 257                         fio.new_blkaddr = blkno;
 258                         break;
 259                 default:
 260                         BUG();
 261                 }
 262
 263                 page = f2fs_grab_cache_page(META_MAPPING(sbi),
 264                                                 fio.new_blkaddr, false);
 265                 if (!page)
 266                         continue;
 267                 if (PageUptodate(page)) {
 268                         f2fs_put_page(page, 1);
 269                         continue;
 270                 }
 271
 272                 fio.page = page;
 273                 err = f2fs_submit_page_bio(&fio);
 274                 f2fs_put_page(page, err ? 1 : 0);
 275
 276                 if (!err)
 277                         f2fs_update_iostat(sbi, FS_META_READ_IO, F2FS_BLKSIZE);
 278         }
 279 out:
 280         blk_finish_plug(&plug);
 281         return blkno - start;
 282 }
 283
 284 void f2fs_ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 285 {
 286         struct page *page;
 287         bool readahead = false;
 288
 289         page = find_get_page(META_MAPPING(sbi), index);
 290         if (!page || !PageUptodate(page))
 291                 readahead = true;
 292         f2fs_put_page(page, 0);
 293
 294         if (readahead)
 295                 f2fs_ra_meta_pages(sbi, index, BIO_MAX_VECS, META_POR, true);
 296 }
 297
 298 static int __f2fs_write_meta_page(struct page *page,
 299                                 struct writeback_control *wbc,
 300                                 enum iostat_type io_type)
 301 {
 302         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 303
 304         trace_f2fs_writepage(page, META);
 305
 306         if (unlikely(f2fs_cp_error(sbi)))
 307                 goto redirty_out;
 308         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 309                 goto redirty_out;
 310         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 311                 goto redirty_out;
 312
 313         f2fs_do_write_meta_page(sbi, page, io_type);
 314         dec_page_count(sbi, F2FS_DIRTY_META);
 315
 316         if (wbc->for_reclaim)
 317                 f2fs_submit_merged_write_cond(sbi, NULL, page, 0, META);
 318
 319         unlock_page(page);
 320
 321         if (unlikely(f2fs_cp_error(sbi)))
 322                 f2fs_submit_merged_write(sbi, META);
 323
 324         return 0;
 325
 326 redirty_out:
 327         redirty_page_for_writepage(wbc, page);
 328         return AOP_WRITEPAGE_ACTIVATE;
 329 }
 330
 331 static int f2fs_write_meta_page(struct page *page,
 332                                 struct writeback_control *wbc)
 333 {
 334         return __f2fs_write_meta_page(page, wbc, FS_META_IO);
 335 }
 336
 337 static int f2fs_write_meta_pages(struct address_space *mapping,
 338                                 struct writeback_control *wbc)
 339 {
 340         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 341         long diff, written;
 342
 343         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 344                 goto skip_write;
 345
 346         /* collect a number of dirty meta pages and write together */
 347         if (wbc->sync_mode != WB_SYNC_ALL &&
 348                         get_pages(sbi, F2FS_DIRTY_META) <
 349                                         nr_pages_to_skip(sbi, META))
 350                 goto skip_write;
 351
 352         /* if locked failed, cp will flush dirty pages instead */
 353         if (!down_write_trylock(&sbi->cp_global_sem))
 354                 goto skip_write;
 355
 356         trace_f2fs_writepages(mapping->host, wbc, META);
 357         diff = nr_pages_to_write(sbi, META, wbc);
 358         written = f2fs_sync_meta_pages(sbi, META, wbc->nr_to_write, FS_META_IO);
 359         up_write(&sbi->cp_global_sem);
 360         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 361         return 0;
 362
 363 skip_write:
 364         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 365         trace_f2fs_writepages(mapping->host, wbc, META);
 366         return 0;
 367 }
 368
 369 long f2fs_sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 370                                 long nr_to_write, enum iostat_type io_type)
 371 {
 372         struct address_space *mapping = META_MAPPING(sbi);
 373         pgoff_t index = 0, prev = ULONG_MAX;
 374         struct pagevec pvec;
 375         long nwritten = 0;
 376         int nr_pages;
 377         struct writeback_control wbc = {
 378                 .for_reclaim = 0,
 379         };
 380         struct blk_plug plug;
 381
 382         pagevec_init(&pvec);
 383
 384         blk_start_plug(&plug);
 385
 386         while ((nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 387                                 PAGECACHE_TAG_DIRTY))) {
 388                 int i;
 389
 390                 for (i = 0; i < nr_pages; i++) {
 391                         struct page *page = pvec.pages[i];
 392
 393                         if (prev == ULONG_MAX)
 394                                 prev = page->index - 1;
 395                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 396                                 pagevec_release(&pvec);
 397                                 goto stop;
 398                         }
 399
 400                         lock_page(page);
 401
 402                         if (unlikely(page->mapping != mapping)) {
 403 continue_unlock:
 404                                 unlock_page(page);
 405                                 continue;
 406                         }
 407                         if (!PageDirty(page)) {
 408                                 /* someone wrote it for us */
 409                                 goto continue_unlock;
 410                         }
 411
 412                         f2fs_wait_on_page_writeback(page, META, true, true);
 413
 414                         if (!clear_page_dirty_for_io(page))
 415                                 goto continue_unlock;
 416
 417                         if (__f2fs_write_meta_page(page, &wbc, io_type)) {
 418                                 unlock_page(page);
 419                                 break;
 420                         }
 421                         nwritten++;
 422                         prev = page->index;
 423                         if (unlikely(nwritten >= nr_to_write))
 424                                 break;
 425                 }
 426                 pagevec_release(&pvec);
 427                 cond_resched();
 428         }
 429 stop:
 430         if (nwritten)
 431                 f2fs_submit_merged_write(sbi, type);
 432
 433         blk_finish_plug(&plug);
 434
 435         return nwritten;
 436 }
 437
 438 static int f2fs_set_meta_page_dirty(struct page *page)
 439 {
 440         trace_f2fs_set_page_dirty(page, META);
 441
 442         if (!PageUptodate(page))
 443                 SetPageUptodate(page);
 444         if (!PageDirty(page)) {
 445                 __set_page_dirty_nobuffers(page);
 446                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 447                 f2fs_set_page_private(page, 0);
 448                 return 1;
 449         }
 450         return 0;
 451 }
 452
 453 const struct address_space_operations f2fs_meta_aops = {
 454         .writepage      = f2fs_write_meta_page,
 455         .writepages     = f2fs_write_meta_pages,
 456         .set_page_dirty = f2fs_set_meta_page_dirty,
 457         .invalidatepage = f2fs_invalidate_page,
 458         .releasepage    = f2fs_release_page,
 459 #ifdef CONFIG_MIGRATION
 460         .migratepage    = f2fs_migrate_page,
 461 #endif
 462 };
 463
 464 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino,
 465                                                 unsigned int devidx, int type)
 466 {
 467         struct inode_management *im = &sbi->im[type];
 468         struct ino_entry *e, *tmp;
 469
 470         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 471
 472         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 473
 474         spin_lock(&im->ino_lock);
 475         e = radix_tree_lookup(&im->ino_root, ino);
 476         if (!e) {
 477                 e = tmp;
 478                 if (unlikely(radix_tree_insert(&im->ino_root, ino, e)))
 479                         f2fs_bug_on(sbi, 1);
 480
 481                 memset(e, 0, sizeof(struct ino_entry));
 482                 e->ino = ino;
 483
 484                 list_add_tail(&e->list, &im->ino_list);
 485                 if (type != ORPHAN_INO)
 486                         im->ino_num++;
 487         }
 488
 489         if (type == FLUSH_INO)
 490                 f2fs_set_bit(devidx, (char *)&e->dirty_device);
 491
 492         spin_unlock(&im->ino_lock);
 493         radix_tree_preload_end();
 494
 495         if (e != tmp)
 496                 kmem_cache_free(ino_entry_slab, tmp);
 497 }
 498
 499 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 500 {
 501         struct inode_management *im = &sbi->im[type];
 502         struct ino_entry *e;
 503
 504         spin_lock(&im->ino_lock);
 505         e = radix_tree_lookup(&im->ino_root, ino);
 506         if (e) {
 507                 list_del(&e->list);
 508                 radix_tree_delete(&im->ino_root, ino);
 509                 im->ino_num--;
 510                 spin_unlock(&im->ino_lock);
 511                 kmem_cache_free(ino_entry_slab, e);
 512                 return;
 513         }
 514         spin_unlock(&im->ino_lock);
 515 }
 516
 517 void f2fs_add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 518 {
 519         /* add new dirty ino entry into list */
 520         __add_ino_entry(sbi, ino, 0, type);
 521 }
 522
 523 void f2fs_remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 524 {
 525         /* remove dirty ino entry from list */
 526         __remove_ino_entry(sbi, ino, type);
 527 }
 528
 529 /* mode should be APPEND_INO, UPDATE_INO or TRANS_DIR_INO */
 530 bool f2fs_exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 531 {
 532         struct inode_management *im = &sbi->im[mode];
 533         struct ino_entry *e;
 534
 535         spin_lock(&im->ino_lock);
 536         e = radix_tree_lookup(&im->ino_root, ino);
 537         spin_unlock(&im->ino_lock);
 538         return e ? true : false;
 539 }
 540
 541 void f2fs_release_ino_entry(struct f2fs_sb_info *sbi, bool all)
 542 {
 543         struct ino_entry *e, *tmp;
 544         int i;
 545
 546         for (i = all ? ORPHAN_INO : APPEND_INO; i < MAX_INO_ENTRY; i++) {
 547                 struct inode_management *im = &sbi->im[i];
 548
 549                 spin_lock(&im->ino_lock);
 550                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 551                         list_del(&e->list);
 552                         radix_tree_delete(&im->ino_root, e->ino);
 553                         kmem_cache_free(ino_entry_slab, e);
 554                         im->ino_num--;
 555                 }
 556                 spin_unlock(&im->ino_lock);
 557         }
 558 }
 559
 560 void f2fs_set_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 561                                         unsigned int devidx, int type)
 562 {
 563         __add_ino_entry(sbi, ino, devidx, type);
 564 }
 565
 566 bool f2fs_is_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 567                                         unsigned int devidx, int type)
 568 {
 569         struct inode_management *im = &sbi->im[type];
 570         struct ino_entry *e;
 571         bool is_dirty = false;
 572
 573         spin_lock(&im->ino_lock);
 574         e = radix_tree_lookup(&im->ino_root, ino);
 575         if (e && f2fs_test_bit(devidx, (char *)&e->dirty_device))
 576                 is_dirty = true;
 577         spin_unlock(&im->ino_lock);
 578         return is_dirty;
 579 }
 580
 581 int f2fs_acquire_orphan_inode(struct f2fs_sb_info *sbi)
 582 {
 583         struct inode_management *im = &sbi->im[ORPHAN_INO];
 584         int err = 0;
 585
 586         spin_lock(&im->ino_lock);
 587
 588         if (time_to_inject(sbi, FAULT_ORPHAN)) {
 589                 spin_unlock(&im->ino_lock);
 590                 f2fs_show_injection_info(sbi, FAULT_ORPHAN);
 591                 return -ENOSPC;
 592         }
 593
 594         if (unlikely(im->ino_num >= sbi->max_orphans))
 595                 err = -ENOSPC;
 596         else
 597                 im->ino_num++;
 598         spin_unlock(&im->ino_lock);
 599
 600         return err;
 601 }
 602
 603 void f2fs_release_orphan_inode(struct f2fs_sb_info *sbi)
 604 {
 605         struct inode_management *im = &sbi->im[ORPHAN_INO];
 606
 607         spin_lock(&im->ino_lock);
 608         f2fs_bug_on(sbi, im->ino_num == 0);
 609         im->ino_num--;
 610         spin_unlock(&im->ino_lock);
 611 }
 612
 613 void f2fs_add_orphan_inode(struct inode *inode)
 614 {
 615         /* add new orphan ino entry into list */
 616         __add_ino_entry(F2FS_I_SB(inode), inode->i_ino, 0, ORPHAN_INO);
 617         f2fs_update_inode_page(inode);
 618 }
 619
 620 void f2fs_remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 621 {
 622         /* remove orphan entry from orphan list */
 623         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 624 }
 625
 626 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 627 {
 628         struct inode *inode;
 629         struct node_info ni;
 630         int err;
 631
 632         inode = f2fs_iget_retry(sbi->sb, ino);
 633         if (IS_ERR(inode)) {
 634                 /*
 635                  * there should be a bug that we can't find the entry
 636                  * to orphan inode.
 637                  */
 638                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 639                 return PTR_ERR(inode);
 640         }
 641
 642         err = dquot_initialize(inode);
 643         if (err) {
 644                 iput(inode);
 645                 goto err_out;
 646         }
 647
 648         clear_nlink(inode);
 649
 650         /* truncate all the data during iput */
 651         iput(inode);
 652
 653         err = f2fs_get_node_info(sbi, ino, &ni);
 654         if (err)
 655                 goto err_out;
 656
 657         /* ENOMEM was fully retried in f2fs_evict_inode. */
 658         if (ni.blk_addr != NULL_ADDR) {
 659                 err = -EIO;
 660                 goto err_out;
 661         }
 662         return 0;
 663
 664 err_out:
 665         set_sbi_flag(sbi, SBI_NEED_FSCK);
 666         f2fs_warn(sbi, "%s: orphan failed (ino=%x), run fsck to fix.",
 667                   __func__, ino);
 668         return err;
 669 }
 670
 671 int f2fs_recover_orphan_inodes(struct f2fs_sb_info *sbi)
 672 {
 673         block_t start_blk, orphan_blocks, i, j;
 674         unsigned int s_flags = sbi->sb->s_flags;
 675         int err = 0;
 676 #ifdef CONFIG_QUOTA
 677         int quota_enabled;
 678 #endif
 679
 680         if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG))
 681                 return 0;
 682
 683         if (bdev_read_only(sbi->sb->s_bdev)) {
 684                 f2fs_info(sbi, "write access unavailable, skipping orphan cleanup");
 685                 return 0;
 686         }
 687
 688         if (s_flags & SB_RDONLY) {
 689                 f2fs_info(sbi, "orphan cleanup on readonly fs");
 690                 sbi->sb->s_flags &= ~SB_RDONLY;
 691         }
 692
 693 #ifdef CONFIG_QUOTA
 694         /* Needed for iput() to work correctly and not trash data */
 695         sbi->sb->s_flags |= SB_ACTIVE;
 696
 697         /*
 698          * Turn on quotas which were not enabled for read-only mounts if
 699          * filesystem has quota feature, so that they are updated correctly.
 700          */
 701         quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
 702 #endif
 703
 704         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 705         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 706
 707         f2fs_ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 708
 709         for (i = 0; i < orphan_blocks; i++) {
 710                 struct page *page;
 711                 struct f2fs_orphan_block *orphan_blk;
 712
 713                 page = f2fs_get_meta_page(sbi, start_blk + i);
 714                 if (IS_ERR(page)) {
 715                         err = PTR_ERR(page);
 716                         goto out;
 717                 }
 718
 719                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 720                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 721                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 722
 723                         err = recover_orphan_inode(sbi, ino);
 724                         if (err) {
 725                                 f2fs_put_page(page, 1);
 726                                 goto out;
 727                         }
 728                 }
 729                 f2fs_put_page(page, 1);
 730         }
 731         /* clear Orphan Flag */
 732         clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG);
 733 out:
 734         set_sbi_flag(sbi, SBI_IS_RECOVERED);
 735
 736 #ifdef CONFIG_QUOTA
 737         /* Turn quotas off */
 738         if (quota_enabled)
 739                 f2fs_quota_off_umount(sbi->sb);
 740 #endif
 741         sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
 742
 743         return err;
 744 }
 745
 746 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 747 {
 748         struct list_head *head;
 749         struct f2fs_orphan_block *orphan_blk = NULL;
 750         unsigned int nentries = 0;
 751         unsigned short index = 1;
 752         unsigned short orphan_blocks;
 753         struct page *page = NULL;
 754         struct ino_entry *orphan = NULL;
 755         struct inode_management *im = &sbi->im[ORPHAN_INO];
 756
 757         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 758
 759         /*
 760          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 761          * orphan inode operations are covered under f2fs_lock_op().
 762          * And, spin_lock should be avoided due to page operations below.
 763          */
 764         head = &im->ino_list;
 765
 766         /* loop for each orphan inode entry and write them in Jornal block */
 767         list_for_each_entry(orphan, head, list) {
 768                 if (!page) {
 769                         page = f2fs_grab_meta_page(sbi, start_blk++);
 770                         orphan_blk =
 771                                 (struct f2fs_orphan_block *)page_address(page);
 772                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 773                 }
 774
 775                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 776
 777                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 778                         /*
 779                          * an orphan block is full of 1020 entries,
 780                          * then we need to flush current orphan blocks
 781                          * and bring another one in memory
 782                          */
 783                         orphan_blk->blk_addr = cpu_to_le16(index);
 784                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 785                         orphan_blk->entry_count = cpu_to_le32(nentries);
 786                         set_page_dirty(page);
 787                         f2fs_put_page(page, 1);
 788                         index++;
 789                         nentries = 0;
 790                         page = NULL;
 791                 }
 792         }
 793
 794         if (page) {
 795                 orphan_blk->blk_addr = cpu_to_le16(index);
 796                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 797                 orphan_blk->entry_count = cpu_to_le32(nentries);
 798                 set_page_dirty(page);
 799                 f2fs_put_page(page, 1);
 800         }
 801 }
 802
 803 static __u32 f2fs_checkpoint_chksum(struct f2fs_sb_info *sbi,
 804                                                 struct f2fs_checkpoint *ckpt)
 805 {
 806         unsigned int chksum_ofs = le32_to_cpu(ckpt->checksum_offset);
 807         __u32 chksum;
 808
 809         chksum = f2fs_crc32(sbi, ckpt, chksum_ofs);
 810         if (chksum_ofs < CP_CHKSUM_OFFSET) {
 811                 chksum_ofs += sizeof(chksum);
 812                 chksum = f2fs_chksum(sbi, chksum, (__u8 *)ckpt + chksum_ofs,
 813                                                 F2FS_BLKSIZE - chksum_ofs);
 814         }
 815         return chksum;
 816 }
 817
 818 static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
 819                 struct f2fs_checkpoint **cp_block, struct page **cp_page,
 820                 unsigned long long *version)
 821 {
 822         size_t crc_offset = 0;
 823         __u32 crc;
 824
 825         *cp_page = f2fs_get_meta_page(sbi, cp_addr);
 826         if (IS_ERR(*cp_page))
 827                 return PTR_ERR(*cp_page);
 828
 829         *cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
 830
 831         crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
 832         if (crc_offset < CP_MIN_CHKSUM_OFFSET ||
 833                         crc_offset > CP_CHKSUM_OFFSET) {
 834                 f2fs_put_page(*cp_page, 1);
 835                 f2fs_warn(sbi, "invalid crc_offset: %zu", crc_offset);
 836                 return -EINVAL;
 837         }
 838
 839         crc = f2fs_checkpoint_chksum(sbi, *cp_block);
 840         if (crc != cur_cp_crc(*cp_block)) {
 841                 f2fs_put_page(*cp_page, 1);
 842                 f2fs_warn(sbi, "invalid crc value");
 843                 return -EINVAL;
 844         }
 845
 846         *version = cur_cp_version(*cp_block);
 847         return 0;
 848 }
 849
 850 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 851                                 block_t cp_addr, unsigned long long *version)
 852 {
 853         struct page *cp_page_1 = NULL, *cp_page_2 = NULL;
 854         struct f2fs_checkpoint *cp_block = NULL;
 855         unsigned long long cur_version = 0, pre_version = 0;
 856         int err;
 857
 858         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 859                                         &cp_page_1, version);
 860         if (err)
 861                 return NULL;
 862
 863         if (le32_to_cpu(cp_block->cp_pack_total_block_count) >
 864                                         sbi->blocks_per_seg) {
 865                 f2fs_warn(sbi, "invalid cp_pack_total_block_count:%u",
 866                           le32_to_cpu(cp_block->cp_pack_total_block_count));
 867                 goto invalid_cp;
 868         }
 869         pre_version = *version;
 870
 871         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 872         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 873                                         &cp_page_2, version);
 874         if (err)
 875                 goto invalid_cp;
 876         cur_version = *version;
 877
 878         if (cur_version == pre_version) {
 879                 *version = cur_version;
 880                 f2fs_put_page(cp_page_2, 1);
 881                 return cp_page_1;
 882         }
 883         f2fs_put_page(cp_page_2, 1);
 884 invalid_cp:
 885         f2fs_put_page(cp_page_1, 1);
 886         return NULL;
 887 }
 888
 889 int f2fs_get_valid_checkpoint(struct f2fs_sb_info *sbi)
 890 {
 891         struct f2fs_checkpoint *cp_block;
 892         struct f2fs_super_block *fsb = sbi->raw_super;
 893         struct page *cp1, *cp2, *cur_page;
 894         unsigned long blk_size = sbi->blocksize;
 895         unsigned long long cp1_version = 0, cp2_version = 0;
 896         unsigned long long cp_start_blk_no;
 897         unsigned int cp_blks = 1 + __cp_payload(sbi);
 898         block_t cp_blk_no;
 899         int i;
 900         int err;
 901
 902         sbi->ckpt = f2fs_kvzalloc(sbi, array_size(blk_size, cp_blks),
 903                                   GFP_KERNEL);
 904         if (!sbi->ckpt)
 905                 return -ENOMEM;
 906         /*
 907          * Finding out valid cp block involves read both
 908          * sets( cp pack 1 and cp pack 2)
 909          */
 910         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 911         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 912
 913         /* The second checkpoint pack should start at the next segment */
 914         cp_start_blk_no += ((unsigned long long)1) <<
 915                                 le32_to_cpu(fsb->log_blocks_per_seg);
 916         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 917
 918         if (cp1 && cp2) {
 919                 if (ver_after(cp2_version, cp1_version))
 920                         cur_page = cp2;
 921                 else
 922                         cur_page = cp1;
 923         } else if (cp1) {
 924                 cur_page = cp1;
 925         } else if (cp2) {
 926                 cur_page = cp2;
 927         } else {
 928                 err = -EFSCORRUPTED;
 929                 goto fail_no_cp;
 930         }
 931
 932         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 933         memcpy(sbi->ckpt, cp_block, blk_size);
 934
 935         if (cur_page == cp1)
 936                 sbi->cur_cp_pack = 1;
 937         else
 938                 sbi->cur_cp_pack = 2;
 939
 940         /* Sanity checking of checkpoint */
 941         if (f2fs_sanity_check_ckpt(sbi)) {
 942                 err = -EFSCORRUPTED;
 943                 goto free_fail_no_cp;
 944         }
 945
 946         if (cp_blks <= 1)
 947                 goto done;
 948
 949         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 950         if (cur_page == cp2)
 951                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 952
 953         for (i = 1; i < cp_blks; i++) {
 954                 void *sit_bitmap_ptr;
 955                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 956
 957                 cur_page = f2fs_get_meta_page(sbi, cp_blk_no + i);
 958                 if (IS_ERR(cur_page)) {
 959                         err = PTR_ERR(cur_page);
 960                         goto free_fail_no_cp;
 961                 }
 962                 sit_bitmap_ptr = page_address(cur_page);
 963                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 964                 f2fs_put_page(cur_page, 1);
 965         }
 966 done:
 967         f2fs_put_page(cp1, 1);
 968         f2fs_put_page(cp2, 1);
 969         return 0;
 970
 971 free_fail_no_cp:
 972         f2fs_put_page(cp1, 1);
 973         f2fs_put_page(cp2, 1);
 974 fail_no_cp:
 975         kvfree(sbi->ckpt);
 976         return err;
 977 }
 978
 979 static void __add_dirty_inode(struct inode *inode, enum inode_type type)
 980 {
 981         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 982         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 983
 984         if (is_inode_flag_set(inode, flag))
 985                 return;
 986
 987         set_inode_flag(inode, flag);
 988         if (!f2fs_is_volatile_file(inode))
 989                 list_add_tail(&F2FS_I(inode)->dirty_list,
 990                                                 &sbi->inode_list[type]);
 991         stat_inc_dirty_inode(sbi, type);
 992 }
 993
 994 static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
 995 {
 996         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 997
 998         if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
 999                 return;
1000
1001         list_del_init(&F2FS_I(inode)->dirty_list);
1002         clear_inode_flag(inode, flag);
1003         stat_dec_dirty_inode(F2FS_I_SB(inode), type);
1004 }
1005
1006 void f2fs_update_dirty_page(struct inode *inode, struct page *page)
1007 {
1008         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1009         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
1010
1011         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
1012                         !S_ISLNK(inode->i_mode))
1013                 return;
1014
1015         spin_lock(&sbi->inode_lock[type]);
1016         if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
1017                 __add_dirty_inode(inode, type);
1018         inode_inc_dirty_pages(inode);
1019         spin_unlock(&sbi->inode_lock[type]);
1020
1021         f2fs_set_page_private(page, 0);
1022 }
1023
1024 void f2fs_remove_dirty_inode(struct inode *inode)
1025 {
1026         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1027         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
1028
1029         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
1030                         !S_ISLNK(inode->i_mode))
1031                 return;
1032
1033         if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
1034                 return;
1035
1036         spin_lock(&sbi->inode_lock[type]);
1037         __remove_dirty_inode(inode, type);
1038         spin_unlock(&sbi->inode_lock[type]);
1039 }
1040
1041 int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
1042 {
1043         struct list_head *head;
1044         struct inode *inode;
1045         struct f2fs_inode_info *fi;
1046         bool is_dir = (type == DIR_INODE);
1047         unsigned long ino = 0;
1048
1049         trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
1050                                 get_pages(sbi, is_dir ?
1051                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1052 retry:
1053         if (unlikely(f2fs_cp_error(sbi))) {
1054                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
1055                                 get_pages(sbi, is_dir ?
1056                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1057                 return -EIO;
1058         }
1059
1060         spin_lock(&sbi->inode_lock[type]);
1061
1062         head = &sbi->inode_list[type];
1063         if (list_empty(head)) {
1064                 spin_unlock(&sbi->inode_lock[type]);
1065                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
1066                                 get_pages(sbi, is_dir ?
1067                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1068                 return 0;
1069         }
1070         fi = list_first_entry(head, struct f2fs_inode_info, dirty_list);
1071         inode = igrab(&fi->vfs_inode);
1072         spin_unlock(&sbi->inode_lock[type]);
1073         if (inode) {
1074                 unsigned long cur_ino = inode->i_ino;
1075
1076                 F2FS_I(inode)->cp_task = current;
1077
1078                 filemap_fdatawrite(inode->i_mapping);
1079
1080                 F2FS_I(inode)->cp_task = NULL;
1081
1082                 iput(inode);
1083                 /* We need to give cpu to another writers. */
1084                 if (ino == cur_ino)
1085                         cond_resched();
1086                 else
1087                         ino = cur_ino;
1088         } else {
1089                 /*
1090                  * We should submit bio, since it exists several
1091                  * wribacking dentry pages in the freeing inode.
1092                  */
1093                 f2fs_submit_merged_write(sbi, DATA);
1094                 cond_resched();
1095         }
1096         goto retry;
1097 }
1098
1099 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
1100 {
1101         struct list_head *head = &sbi->inode_list[DIRTY_META];
1102         struct inode *inode;
1103         struct f2fs_inode_info *fi;
1104         s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
1105
1106         while (total--) {
1107                 if (unlikely(f2fs_cp_error(sbi)))
1108                         return -EIO;
1109
1110                 spin_lock(&sbi->inode_lock[DIRTY_META]);
1111                 if (list_empty(head)) {
1112                         spin_unlock(&sbi->inode_lock[DIRTY_META]);
1113                         return 0;
1114                 }
1115                 fi = list_first_entry(head, struct f2fs_inode_info,
1116                                                         gdirty_list);
1117                 inode = igrab(&fi->vfs_inode);
1118                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
1119                 if (inode) {
1120                         sync_inode_metadata(inode, 0);
1121
1122                         /* it's on eviction */
1123                         if (is_inode_flag_set(inode, FI_DIRTY_INODE))
1124                                 f2fs_update_inode_page(inode);
1125                         iput(inode);
1126                 }
1127         }
1128         return 0;
1129 }
1130
1131 static void __prepare_cp_block(struct f2fs_sb_info *sbi)
1132 {
1133         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1134         struct f2fs_nm_info *nm_i = NM_I(sbi);
1135         nid_t last_nid = nm_i->next_scan_nid;
1136
1137         next_free_nid(sbi, &last_nid);
1138         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
1139         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
1140         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
1141         ckpt->next_free_nid = cpu_to_le32(last_nid);
1142 }
1143
1144 static bool __need_flush_quota(struct f2fs_sb_info *sbi)
1145 {
1146         bool ret = false;
1147
1148         if (!is_journalled_quota(sbi))
1149                 return false;
1150
1151         down_write(&sbi->quota_sem);
1152         if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH)) {
1153                 ret = false;
1154         } else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR)) {
1155                 ret = false;
1156         } else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_FLUSH)) {
1157                 clear_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
1158                 ret = true;
1159         } else if (get_pages(sbi, F2FS_DIRTY_QDATA)) {
1160                 ret = true;
1161         }
1162         up_write(&sbi->quota_sem);
1163         return ret;
1164 }
1165
1166 /*
1167  * Freeze all the FS-operations for checkpoint.
1168  */
1169 static int block_operations(struct f2fs_sb_info *sbi)
1170 {
1171         struct writeback_control wbc = {
1172                 .sync_mode = WB_SYNC_ALL,
1173                 .nr_to_write = LONG_MAX,
1174                 .for_reclaim = 0,
1175         };
1176         int err = 0, cnt = 0;
1177
1178         /*
1179          * Let's flush inline_data in dirty node pages.
1180          */
1181         f2fs_flush_inline_data(sbi);
1182
1183 retry_flush_quotas:
1184         f2fs_lock_all(sbi);
1185         if (__need_flush_quota(sbi)) {
1186                 int locked;
1187
1188                 if (++cnt > DEFAULT_RETRY_QUOTA_FLUSH_COUNT) {
1189                         set_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
1190                         set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
1191                         goto retry_flush_dents;
1192                 }
1193                 f2fs_unlock_all(sbi);
1194
1195                 /* only failed during mount/umount/freeze/quotactl */
1196                 locked = down_read_trylock(&sbi->sb->s_umount);
1197                 f2fs_quota_sync(sbi->sb, -1);
1198                 if (locked)
1199                         up_read(&sbi->sb->s_umount);
1200                 cond_resched();
1201                 goto retry_flush_quotas;
1202         }
1203
1204 retry_flush_dents:
1205         /* write all the dirty dentry pages */
1206         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
1207                 f2fs_unlock_all(sbi);
1208                 err = f2fs_sync_dirty_inodes(sbi, DIR_INODE);
1209                 if (err)
1210                         return err;
1211                 cond_resched();
1212                 goto retry_flush_quotas;
1213         }
1214
1215         /*
1216          * POR: we should ensure that there are no dirty node pages
1217          * until finishing nat/sit flush. inode->i_blocks can be updated.
1218          */
1219         down_write(&sbi->node_change);
1220
1221         if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
1222                 up_write(&sbi->node_change);
1223                 f2fs_unlock_all(sbi);
1224                 err = f2fs_sync_inode_meta(sbi);
1225                 if (err)
1226                         return err;
1227                 cond_resched();
1228                 goto retry_flush_quotas;
1229         }
1230
1231 retry_flush_nodes:
1232         down_write(&sbi->node_write);
1233
1234         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
1235                 up_write(&sbi->node_write);
1236                 atomic_inc(&sbi->wb_sync_req[NODE]);
1237                 err = f2fs_sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO);
1238                 atomic_dec(&sbi->wb_sync_req[NODE]);
1239                 if (err) {
1240                         up_write(&sbi->node_change);
1241                         f2fs_unlock_all(sbi);
1242                         return err;
1243                 }
1244                 cond_resched();
1245                 goto retry_flush_nodes;
1246         }
1247
1248         /*
1249          * sbi->node_change is used only for AIO write_begin path which produces
1250          * dirty node blocks and some checkpoint values by block allocation.
1251          */
1252         __prepare_cp_block(sbi);
1253         up_write(&sbi->node_change);
1254         return err;
1255 }
1256
1257 static void unblock_operations(struct f2fs_sb_info *sbi)
1258 {
1259         up_write(&sbi->node_write);
1260         f2fs_unlock_all(sbi);
1261 }
1262
1263 void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type)
1264 {
1265         DEFINE_WAIT(wait);
1266
1267         for (;;) {
1268                 if (!get_pages(sbi, type))
1269                         break;
1270
1271                 if (unlikely(f2fs_cp_error(sbi)))
1272                         break;
1273
1274                 if (type == F2FS_DIRTY_META)
1275                         f2fs_sync_meta_pages(sbi, META, LONG_MAX,
1276                                                         FS_CP_META_IO);
1277                 else if (type == F2FS_WB_CP_DATA)
1278                         f2fs_submit_merged_write(sbi, DATA);
1279
1280                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
1281                 io_schedule_timeout(DEFAULT_IO_TIMEOUT);
1282         }
1283         finish_wait(&sbi->cp_wait, &wait);
1284 }
1285
1286 static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1287 {
1288         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
1289         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1290         unsigned long flags;
1291
1292         spin_lock_irqsave(&sbi->cp_lock, flags);
1293
1294         if ((cpc->reason & CP_UMOUNT) &&
1295                         le32_to_cpu(ckpt->cp_pack_total_block_count) >
1296                         sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks)
1297                 disable_nat_bits(sbi, false);
1298
1299         if (cpc->reason & CP_TRIMMED)
1300                 __set_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1301         else
1302                 __clear_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1303
1304         if (cpc->reason & CP_UMOUNT)
1305                 __set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1306         else
1307                 __clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1308
1309         if (cpc->reason & CP_FASTBOOT)
1310                 __set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1311         else
1312                 __clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1313
1314         if (orphan_num)
1315                 __set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1316         else
1317                 __clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1318
1319         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1320                 __set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1321
1322         if (is_sbi_flag_set(sbi, SBI_IS_RESIZEFS))
1323                 __set_ckpt_flags(ckpt, CP_RESIZEFS_FLAG);
1324         else
1325                 __clear_ckpt_flags(ckpt, CP_RESIZEFS_FLAG);
1326
1327         if (is_sbi_flag_set(sbi, SBI_CP_DISABLED))
1328                 __set_ckpt_flags(ckpt, CP_DISABLED_FLAG);
1329         else
1330                 __clear_ckpt_flags(ckpt, CP_DISABLED_FLAG);
1331
1332         if (is_sbi_flag_set(sbi, SBI_CP_DISABLED_QUICK))
1333                 __set_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
1334         else
1335                 __clear_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
1336
1337         if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH))
1338                 __set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
1339         else
1340                 __clear_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
1341
1342         if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR))
1343                 __set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
1344
1345         /* set this flag to activate crc|cp_ver for recovery */
1346         __set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
1347         __clear_ckpt_flags(ckpt, CP_NOCRC_RECOVERY_FLAG);
1348
1349         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1350 }
1351
1352 static void commit_checkpoint(struct f2fs_sb_info *sbi,
1353         void *src, block_t blk_addr)
1354 {
1355         struct writeback_control wbc = {
1356                 .for_reclaim = 0,
1357         };
1358
1359         /*
1360          * pagevec_lookup_tag and lock_page again will take
1361          * some extra time. Therefore, f2fs_update_meta_pages and
1362          * f2fs_sync_meta_pages are combined in this function.
1363          */
1364         struct page *page = f2fs_grab_meta_page(sbi, blk_addr);
1365         int err;
1366
1367         f2fs_wait_on_page_writeback(page, META, true, true);
1368
1369         memcpy(page_address(page), src, PAGE_SIZE);
1370
1371         set_page_dirty(page);
1372         if (unlikely(!clear_page_dirty_for_io(page)))
1373                 f2fs_bug_on(sbi, 1);
1374
1375         /* writeout cp pack 2 page */
1376         err = __f2fs_write_meta_page(page, &wbc, FS_CP_META_IO);
1377         if (unlikely(err && f2fs_cp_error(sbi))) {
1378                 f2fs_put_page(page, 1);
1379                 return;
1380         }
1381
1382         f2fs_bug_on(sbi, err);
1383         f2fs_put_page(page, 0);
1384
1385         /* submit checkpoint (with barrier if NOBARRIER is not set) */
1386         f2fs_submit_merged_write(sbi, META_FLUSH);
1387 }
1388
1389 static inline u64 get_sectors_written(struct block_device *bdev)
1390 {
1391         return (u64)part_stat_read(bdev, sectors[STAT_WRITE]);
1392 }
1393
1394 u64 f2fs_get_sectors_written(struct f2fs_sb_info *sbi)
1395 {
1396         if (f2fs_is_multi_device(sbi)) {
1397                 u64 sectors = 0;
1398                 int i;
1399
1400                 for (i = 0; i < sbi->s_ndevs; i++)
1401                         sectors += get_sectors_written(FDEV(i).bdev);
1402
1403                 return sectors;
1404         }
1405
1406         return get_sectors_written(sbi->sb->s_bdev);
1407 }
1408
1409 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1410 {
1411         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1412         struct f2fs_nm_info *nm_i = NM_I(sbi);
1413         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num, flags;
1414         block_t start_blk;
1415         unsigned int data_sum_blocks, orphan_blocks;
1416         __u32 crc32 = 0;
1417         int i;
1418         int cp_payload_blks = __cp_payload(sbi);
1419         struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
1420         u64 kbytes_written;
1421         int err;
1422
1423         /* Flush all the NAT/SIT pages */
1424         f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1425
1426         /* start to update checkpoint, cp ver is already updated previously */
1427         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi, true));
1428         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
1429         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
1430                 ckpt->cur_node_segno[i] =
1431                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
1432                 ckpt->cur_node_blkoff[i] =
1433                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
1434                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
1435                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
1436         }
1437         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
1438                 ckpt->cur_data_segno[i] =
1439                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
1440                 ckpt->cur_data_blkoff[i] =
1441                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
1442                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
1443                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
1444         }
1445
1446         /* 2 cp + n data seg summary + orphan inode blocks */
1447         data_sum_blocks = f2fs_npages_for_summary_flush(sbi, false);
1448         spin_lock_irqsave(&sbi->cp_lock, flags);
1449         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
1450                 __set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1451         else
1452                 __clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1453         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1454
1455         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
1456         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
1457                         orphan_blocks);
1458
1459         if (__remain_node_summaries(cpc->reason))
1460                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1461                                 cp_payload_blks + data_sum_blocks +
1462                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
1463         else
1464                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1465                                 cp_payload_blks + data_sum_blocks +
1466                                 orphan_blocks);
1467
1468         /* update ckpt flag for checkpoint */
1469         update_ckpt_flags(sbi, cpc);
1470
1471         /* update SIT/NAT bitmap */
1472         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1473         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1474
1475         crc32 = f2fs_checkpoint_chksum(sbi, ckpt);
1476         *((__le32 *)((unsigned char *)ckpt +
1477                                 le32_to_cpu(ckpt->checksum_offset)))
1478                                 = cpu_to_le32(crc32);
1479
1480         start_blk = __start_cp_next_addr(sbi);
1481
1482         /* write nat bits */
1483         if (enabled_nat_bits(sbi, cpc)) {
1484                 __u64 cp_ver = cur_cp_version(ckpt);
1485                 block_t blk;
1486
1487                 cp_ver |= ((__u64)crc32 << 32);
1488                 *(__le64 *)nm_i->nat_bits = cpu_to_le64(cp_ver);
1489
1490                 blk = start_blk + sbi->blocks_per_seg - nm_i->nat_bits_blocks;
1491                 for (i = 0; i < nm_i->nat_bits_blocks; i++)
1492                         f2fs_update_meta_page(sbi, nm_i->nat_bits +
1493                                         (i << F2FS_BLKSIZE_BITS), blk + i);
1494         }
1495
1496         /* write out checkpoint buffer at block 0 */
1497         f2fs_update_meta_page(sbi, ckpt, start_blk++);
1498
1499         for (i = 1; i < 1 + cp_payload_blks; i++)
1500                 f2fs_update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1501                                                         start_blk++);
1502
1503         if (orphan_num) {
1504                 write_orphan_inodes(sbi, start_blk);
1505                 start_blk += orphan_blocks;
1506         }
1507
1508         f2fs_write_data_summaries(sbi, start_blk);
1509         start_blk += data_sum_blocks;
1510
1511         /* Record write statistics in the hot node summary */
1512         kbytes_written = sbi->kbytes_written;
1513         kbytes_written += (f2fs_get_sectors_written(sbi) -
1514                                 sbi->sectors_written_start) >> 1;
1515         seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
1516
1517         if (__remain_node_summaries(cpc->reason)) {
1518                 f2fs_write_node_summaries(sbi, start_blk);
1519                 start_blk += NR_CURSEG_NODE_TYPE;
1520         }
1521
1522         /* update user_block_counts */
1523         sbi->last_valid_block_count = sbi->total_valid_block_count;
1524         percpu_counter_set(&sbi->alloc_valid_block_count, 0);
1525
1526         /* Here, we have one bio having CP pack except cp pack 2 page */
1527         f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1528         /* Wait for all dirty meta pages to be submitted for IO */
1529         f2fs_wait_on_all_pages(sbi, F2FS_DIRTY_META);
1530
1531         /* wait for previous submitted meta pages writeback */
1532         f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA);
1533
1534         /* flush all device cache */
1535         err = f2fs_flush_device_cache(sbi);
1536         if (err)
1537                 return err;
1538
1539         /* barrier and flush checkpoint cp pack 2 page if it can */
1540         commit_checkpoint(sbi, ckpt, start_blk);
1541         f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA);
1542
1543         /*
1544          * invalidate intermediate page cache borrowed from meta inode which are
1545          * used for migration of encrypted, verity or compressed inode's blocks.
1546          */
1547         if (f2fs_sb_has_encrypt(sbi) || f2fs_sb_has_verity(sbi) ||
1548                 f2fs_sb_has_compression(sbi))
1549                 invalidate_mapping_pages(META_MAPPING(sbi),
1550                                 MAIN_BLKADDR(sbi), MAX_BLKADDR(sbi) - 1);
1551
1552         f2fs_release_ino_entry(sbi, false);
1553
1554         f2fs_reset_fsync_node_info(sbi);
1555
1556         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1557         clear_sbi_flag(sbi, SBI_NEED_CP);
1558         clear_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
1559
1560         spin_lock(&sbi->stat_lock);
1561         sbi->unusable_block_count = 0;
1562         spin_unlock(&sbi->stat_lock);
1563
1564         __set_cp_next_pack(sbi);
1565
1566         /*
1567          * redirty superblock if metadata like node page or inode cache is
1568          * updated during writing checkpoint.
1569          */
1570         if (get_pages(sbi, F2FS_DIRTY_NODES) ||
1571                         get_pages(sbi, F2FS_DIRTY_IMETA))
1572                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1573
1574         f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS));
1575
1576         return unlikely(f2fs_cp_error(sbi)) ? -EIO : 0;
1577 }
1578
1579 int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1580 {
1581         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1582         unsigned long long ckpt_ver;
1583         int err = 0;
1584
1585         if (f2fs_readonly(sbi->sb) || f2fs_hw_is_readonly(sbi))
1586                 return -EROFS;
1587
1588         if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
1589                 if (cpc->reason != CP_PAUSE)
1590                         return 0;
1591                 f2fs_warn(sbi, "Start checkpoint disabled!");
1592         }
1593         if (cpc->reason != CP_RESIZE)
1594                 down_write(&sbi->cp_global_sem);
1595
1596         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1597                 ((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) ||
1598                 ((cpc->reason & CP_DISCARD) && !sbi->discard_blks)))
1599                 goto out;
1600         if (unlikely(f2fs_cp_error(sbi))) {
1601                 err = -EIO;
1602                 goto out;
1603         }
1604
1605         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1606
1607         err = block_operations(sbi);
1608         if (err)
1609                 goto out;
1610
1611         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1612
1613         f2fs_flush_merged_writes(sbi);
1614
1615         /* this is the case of multiple fstrims without any changes */
1616         if (cpc->reason & CP_DISCARD) {
1617                 if (!f2fs_exist_trim_candidates(sbi, cpc)) {
1618                         unblock_operations(sbi);
1619                         goto out;
1620                 }
1621
1622                 if (NM_I(sbi)->nat_cnt[DIRTY_NAT] == 0 &&
1623                                 SIT_I(sbi)->dirty_sentries == 0 &&
1624                                 prefree_segments(sbi) == 0) {
1625                         f2fs_flush_sit_entries(sbi, cpc);
1626                         f2fs_clear_prefree_segments(sbi, cpc);
1627                         unblock_operations(sbi);
1628                         goto out;
1629                 }
1630         }
1631
1632         /*
1633          * update checkpoint pack index
1634          * Increase the version number so that
1635          * SIT entries and seg summaries are written at correct place
1636          */
1637         ckpt_ver = cur_cp_version(ckpt);
1638         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1639
1640         /* write cached NAT/SIT entries to NAT/SIT area */
1641         err = f2fs_flush_nat_entries(sbi, cpc);
1642         if (err)
1643                 goto stop;
1644
1645         f2fs_flush_sit_entries(sbi, cpc);
1646
1647         /* save inmem log status */
1648         f2fs_save_inmem_curseg(sbi);
1649
1650         err = do_checkpoint(sbi, cpc);
1651         if (err)
1652                 f2fs_release_discard_addrs(sbi);
1653         else
1654                 f2fs_clear_prefree_segments(sbi, cpc);
1655
1656         f2fs_restore_inmem_curseg(sbi);
1657 stop:
1658         unblock_operations(sbi);
1659         stat_inc_cp_count(sbi->stat_info);
1660
1661         if (cpc->reason & CP_RECOVERY)
1662                 f2fs_notice(sbi, "checkpoint: version = %llx", ckpt_ver);
1663
1664         /* update CP_TIME to trigger checkpoint periodically */
1665         f2fs_update_time(sbi, CP_TIME);
1666         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1667 out:
1668         if (cpc->reason != CP_RESIZE)
1669                 up_write(&sbi->cp_global_sem);
1670         return err;
1671 }
1672
1673 void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi)
1674 {
1675         int i;
1676
1677         for (i = 0; i < MAX_INO_ENTRY; i++) {
1678                 struct inode_management *im = &sbi->im[i];
1679
1680                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1681                 spin_lock_init(&im->ino_lock);
1682                 INIT_LIST_HEAD(&im->ino_list);
1683                 im->ino_num = 0;
1684         }
1685
1686         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1687                         NR_CURSEG_PERSIST_TYPE - __cp_payload(sbi)) *
1688                                 F2FS_ORPHANS_PER_BLOCK;
1689 }
1690
1691 int __init f2fs_create_checkpoint_caches(void)
1692 {
1693         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1694                         sizeof(struct ino_entry));
1695         if (!ino_entry_slab)
1696                 return -ENOMEM;
1697         f2fs_inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1698                         sizeof(struct inode_entry));
1699         if (!f2fs_inode_entry_slab) {
1700                 kmem_cache_destroy(ino_entry_slab);
1701                 return -ENOMEM;
1702         }
1703         return 0;
1704 }
1705
1706 void f2fs_destroy_checkpoint_caches(void)
1707 {
1708         kmem_cache_destroy(ino_entry_slab);
1709         kmem_cache_destroy(f2fs_inode_entry_slab);
1710 }
1711
1712 static int __write_checkpoint_sync(struct f2fs_sb_info *sbi)
1713 {
1714         struct cp_control cpc = { .reason = CP_SYNC, };
1715         int err;
1716
1717         down_write(&sbi->gc_lock);
1718         err = f2fs_write_checkpoint(sbi, &cpc);
1719         up_write(&sbi->gc_lock);
1720
1721         return err;
1722 }
1723
1724 static void __checkpoint_and_complete_reqs(struct f2fs_sb_info *sbi)
1725 {
1726         struct ckpt_req_control *cprc = &sbi->cprc_info;
1727         struct ckpt_req *req, *next;
1728         struct llist_node *dispatch_list;
1729         u64 sum_diff = 0, diff, count = 0;
1730         int ret;
1731
1732         dispatch_list = llist_del_all(&cprc->issue_list);
1733         if (!dispatch_list)
1734                 return;
1735         dispatch_list = llist_reverse_order(dispatch_list);
1736
1737         ret = __write_checkpoint_sync(sbi);
1738         atomic_inc(&cprc->issued_ckpt);
1739
1740         llist_for_each_entry_safe(req, next, dispatch_list, llnode) {
1741                 diff = (u64)ktime_ms_delta(ktime_get(), req->queue_time);
1742                 req->ret = ret;
1743                 complete(&req->wait);
1744
1745                 sum_diff += diff;
1746                 count++;
1747         }
1748         atomic_sub(count, &cprc->queued_ckpt);
1749         atomic_add(count, &cprc->total_ckpt);
1750
1751         spin_lock(&cprc->stat_lock);
1752         cprc->cur_time = (unsigned int)div64_u64(sum_diff, count);
1753         if (cprc->peak_time < cprc->cur_time)
1754                 cprc->peak_time = cprc->cur_time;
1755         spin_unlock(&cprc->stat_lock);
1756 }
1757
1758 static int issue_checkpoint_thread(void *data)
1759 {
1760         struct f2fs_sb_info *sbi = data;
1761         struct ckpt_req_control *cprc = &sbi->cprc_info;
1762         wait_queue_head_t *q = &cprc->ckpt_wait_queue;
1763 repeat:
1764         if (kthread_should_stop())
1765                 return 0;
1766
1767         if (!llist_empty(&cprc->issue_list))
1768                 __checkpoint_and_complete_reqs(sbi);
1769
1770         wait_event_interruptible(*q,
1771                 kthread_should_stop() || !llist_empty(&cprc->issue_list));
1772         goto repeat;
1773 }
1774
1775 static void flush_remained_ckpt_reqs(struct f2fs_sb_info *sbi,
1776                 struct ckpt_req *wait_req)
1777 {
1778         struct ckpt_req_control *cprc = &sbi->cprc_info;
1779
1780         if (!llist_empty(&cprc->issue_list)) {
1781                 __checkpoint_and_complete_reqs(sbi);
1782         } else {
1783                 /* already dispatched by issue_checkpoint_thread */
1784                 if (wait_req)
1785                         wait_for_completion(&wait_req->wait);
1786         }
1787 }
1788
1789 static void init_ckpt_req(struct ckpt_req *req)
1790 {
1791         memset(req, 0, sizeof(struct ckpt_req));
1792
1793         init_completion(&req->wait);
1794         req->queue_time = ktime_get();
1795 }
1796
1797 int f2fs_issue_checkpoint(struct f2fs_sb_info *sbi)
1798 {
1799         struct ckpt_req_control *cprc = &sbi->cprc_info;
1800         struct ckpt_req req;
1801         struct cp_control cpc;
1802
1803         cpc.reason = __get_cp_reason(sbi);
1804         if (!test_opt(sbi, MERGE_CHECKPOINT) || cpc.reason != CP_SYNC) {
1805                 int ret;
1806
1807                 down_write(&sbi->gc_lock);
1808                 ret = f2fs_write_checkpoint(sbi, &cpc);
1809                 up_write(&sbi->gc_lock);
1810
1811                 return ret;
1812         }
1813
1814         if (!cprc->f2fs_issue_ckpt)
1815                 return __write_checkpoint_sync(sbi);
1816
1817         init_ckpt_req(&req);
1818
1819         llist_add(&req.llnode, &cprc->issue_list);
1820         atomic_inc(&cprc->queued_ckpt);
1821
1822         /*
1823          * update issue_list before we wake up issue_checkpoint thread,
1824          * this smp_mb() pairs with another barrier in ___wait_event(),
1825          * see more details in comments of waitqueue_active().
1826          */
1827         smp_mb();
1828
1829         if (waitqueue_active(&cprc->ckpt_wait_queue))
1830                 wake_up(&cprc->ckpt_wait_queue);
1831
1832         if (cprc->f2fs_issue_ckpt)
1833                 wait_for_completion(&req.wait);
1834         else
1835                 flush_remained_ckpt_reqs(sbi, &req);
1836
1837         return req.ret;
1838 }
1839
1840 int f2fs_start_ckpt_thread(struct f2fs_sb_info *sbi)
1841 {
1842         dev_t dev = sbi->sb->s_bdev->bd_dev;
1843         struct ckpt_req_control *cprc = &sbi->cprc_info;
1844
1845         if (cprc->f2fs_issue_ckpt)
1846                 return 0;
1847
1848         cprc->f2fs_issue_ckpt = kthread_run(issue_checkpoint_thread, sbi,
1849                         "f2fs_ckpt-%u:%u", MAJOR(dev), MINOR(dev));
1850         if (IS_ERR(cprc->f2fs_issue_ckpt)) {
1851                 cprc->f2fs_issue_ckpt = NULL;
1852                 return -ENOMEM;
1853         }
1854
1855         set_task_ioprio(cprc->f2fs_issue_ckpt, cprc->ckpt_thread_ioprio);
1856
1857         return 0;
1858 }
1859
1860 void f2fs_stop_ckpt_thread(struct f2fs_sb_info *sbi)
1861 {
1862         struct ckpt_req_control *cprc = &sbi->cprc_info;
1863
1864         if (cprc->f2fs_issue_ckpt) {
1865                 struct task_struct *ckpt_task = cprc->f2fs_issue_ckpt;
1866
1867                 cprc->f2fs_issue_ckpt = NULL;
1868                 kthread_stop(ckpt_task);
1869
1870                 flush_remained_ckpt_reqs(sbi, NULL);
1871         }
1872 }
1873
1874 void f2fs_init_ckpt_req_control(struct f2fs_sb_info *sbi)
1875 {
1876         struct ckpt_req_control *cprc = &sbi->cprc_info;
1877
1878         atomic_set(&cprc->issued_ckpt, 0);
1879         atomic_set(&cprc->total_ckpt, 0);
1880         atomic_set(&cprc->queued_ckpt, 0);
1881         cprc->ckpt_thread_ioprio = DEFAULT_CHECKPOINT_IOPRIO;
1882         init_waitqueue_head(&cprc->ckpt_wait_queue);
1883         init_llist_head(&cprc->issue_list);
1884         spin_lock_init(&cprc->stat_lock);
1885 }