fs/f2fs/checkpoint.c

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