linux/fs/f2fs/checkpoint.c
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   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
  25static struct kmem_cache *ino_entry_slab;
  26struct kmem_cache *f2fs_inode_entry_slab;
  27
  28void 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 */
  39struct 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;
  43repeat:
  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
  55static 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;
  74repeat:
  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        }
 103out:
 104        return page;
 105}
 106
 107struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 108{
 109        return __get_meta_page(sbi, index, true);
 110}
 111
 112struct page *f2fs_get_meta_page_retry(struct f2fs_sb_info *sbi, pgoff_t index)
 113{
 114        struct page *page;
 115        int count = 0;
 116
 117retry:
 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 */
 129struct page *f2fs_get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 130{
 131        return __get_meta_page(sbi, index, false);
 132}
 133
 134static 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
 158bool 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 */
 212int 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        }
 279out:
 280        blk_finish_plug(&plug);
 281        return blkno - start;
 282}
 283
 284void 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
 298static 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
 326redirty_out:
 327        redirty_page_for_writepage(wbc, page);
 328        return AOP_WRITEPAGE_ACTIVATE;
 329}
 330
 331static 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
 337static 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
 363skip_write:
 364        wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 365        trace_f2fs_writepages(mapping->host, wbc, META);
 366        return 0;
 367}
 368
 369long 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)) {
 403continue_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        }
 429stop:
 430        if (nwritten)
 431                f2fs_submit_merged_write(sbi, type);
 432
 433        blk_finish_plug(&plug);
 434
 435        return nwritten;
 436}
 437
 438static 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                set_page_private_reference(page);
 448                return 1;
 449        }
 450        return 0;
 451}
 452
 453const 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
 464static 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
 499static 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
 517void 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
 523void 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 */
 530bool 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
 541void 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
 560void 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
 566bool 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
 581int 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
 603void 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
 613void 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
 620void 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
 626static 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
 664err_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
 671int 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);
 733out:
 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
 746static 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
 803static __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
 818static 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
 850static 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);
 884invalid_cp:
 885        f2fs_put_page(cp_page_1, 1);
 886        return NULL;
 887}
 888
 889int 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        }
 966done:
 967        f2fs_put_page(cp1, 1);
 968        f2fs_put_page(cp2, 1);
 969        return 0;
 970
 971free_fail_no_cp:
 972        f2fs_put_page(cp1, 1);
 973        f2fs_put_page(cp2, 1);
 974fail_no_cp:
 975        kvfree(sbi->ckpt);
 976        return err;
 977}
 978
 979static 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
 994static 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
1006void 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        set_page_private_reference(page);
1022}
1023
1024void 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
1041int 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));
1052retry:
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
1099int 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
1131static 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
1144static 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 */
1169static 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
1183retry_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
1204retry_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
1231retry_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
1257static void unblock_operations(struct f2fs_sb_info *sbi)
1258{
1259        up_write(&sbi->node_write);
1260        f2fs_unlock_all(sbi);
1261}
1262
1263void 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
1286static 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
1352static 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
1389static inline u64 get_sectors_written(struct block_device *bdev)
1390{
1391        return (u64)part_stat_read(bdev, sectors[STAT_WRITE]);
1392}
1393
1394u64 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
1409static 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
1579int 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);
1657stop:
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");
1667out:
1668        if (cpc->reason != CP_RESIZE)
1669                up_write(&sbi->cp_global_sem);
1670        return err;
1671}
1672
1673void 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
1691int __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
1706void f2fs_destroy_checkpoint_caches(void)
1707{
1708        kmem_cache_destroy(ino_entry_slab);
1709        kmem_cache_destroy(f2fs_inode_entry_slab);
1710}
1711
1712static 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
1724static 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
1758static 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;
1763repeat:
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
1775static 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
1789static 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
1797int 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
1840int 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
1860void 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
1874void 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}
1886
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