fs/f2fs/checkpoint.c

   1 /*
   2  * fs/f2fs/checkpoint.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/bio.h>
  13 #include <linux/mpage.h>
  14 #include <linux/writeback.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/f2fs_fs.h>
  17 #include <linux/pagevec.h>
  18 #include <linux/swap.h>
  19
  20 #include "f2fs.h"
  21 #include "node.h"
  22 #include "segment.h"
  23 #include "trace.h"
  24 #include <trace/events/f2fs.h>
  25
  26 static struct kmem_cache *ino_entry_slab;
  27 struct kmem_cache *inode_entry_slab;
  28
  29 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
  30 {
  31         set_ckpt_flags(sbi, CP_ERROR_FLAG);
  32         if (!end_io)
  33                 f2fs_flush_merged_writes(sbi);
  34 }
  35
  36 /*
  37  * We guarantee no failure on the returned page.
  38  */
  39 struct page *grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  40 {
  41         struct address_space *mapping = META_MAPPING(sbi);
  42         struct page *page = NULL;
  43 repeat:
  44         page = f2fs_grab_cache_page(mapping, index, false);
  45         if (!page) {
  46                 cond_resched();
  47                 goto repeat;
  48         }
  49         f2fs_wait_on_page_writeback(page, META, true);
  50         if (!PageUptodate(page))
  51                 SetPageUptodate(page);
  52         return page;
  53 }
  54
  55 /*
  56  * We guarantee no failure on the returned page.
  57  */
  58 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
  59                                                         bool is_meta)
  60 {
  61         struct address_space *mapping = META_MAPPING(sbi);
  62         struct page *page;
  63         struct f2fs_io_info fio = {
  64                 .sbi = sbi,
  65                 .type = META,
  66                 .op = REQ_OP_READ,
  67                 .op_flags = REQ_META | REQ_PRIO,
  68                 .old_blkaddr = index,
  69                 .new_blkaddr = index,
  70                 .encrypted_page = NULL,
  71         };
  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         if (f2fs_submit_page_bio(&fio)) {
  87                 f2fs_put_page(page, 1);
  88                 goto repeat;
  89         }
  90
  91         lock_page(page);
  92         if (unlikely(page->mapping != mapping)) {
  93                 f2fs_put_page(page, 1);
  94                 goto repeat;
  95         }
  96
  97         /*
  98          * if there is any IO error when accessing device, make our filesystem
  99          * readonly and make sure do not write checkpoint with non-uptodate
 100          * meta page.
 101          */
 102         if (unlikely(!PageUptodate(page)))
 103                 f2fs_stop_checkpoint(sbi, false);
 104 out:
 105         return page;
 106 }
 107
 108 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 109 {
 110         return __get_meta_page(sbi, index, true);
 111 }
 112
 113 /* for POR only */
 114 struct page *get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 115 {
 116         return __get_meta_page(sbi, index, false);
 117 }
 118
 119 bool is_valid_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type)
 120 {
 121         switch (type) {
 122         case META_NAT:
 123                 break;
 124         case META_SIT:
 125                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 126                         return false;
 127                 break;
 128         case META_SSA:
 129                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 130                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 131                         return false;
 132                 break;
 133         case META_CP:
 134                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 135                         blkaddr < __start_cp_addr(sbi)))
 136                         return false;
 137                 break;
 138         case META_POR:
 139                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 140                         blkaddr < MAIN_BLKADDR(sbi)))
 141                         return false;
 142                 break;
 143         default:
 144                 BUG();
 145         }
 146
 147         return true;
 148 }
 149
 150 /*
 151  * Readahead CP/NAT/SIT/SSA pages
 152  */
 153 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 154                                                         int type, bool sync)
 155 {
 156         struct page *page;
 157         block_t blkno = start;
 158         struct f2fs_io_info fio = {
 159                 .sbi = sbi,
 160                 .type = META,
 161                 .op = REQ_OP_READ,
 162                 .op_flags = sync ? (REQ_META | REQ_PRIO) : REQ_RAHEAD,
 163                 .encrypted_page = NULL,
 164                 .in_list = false,
 165         };
 166         struct blk_plug plug;
 167
 168         if (unlikely(type == META_POR))
 169                 fio.op_flags &= ~REQ_META;
 170
 171         blk_start_plug(&plug);
 172         for (; nrpages-- > 0; blkno++) {
 173
 174                 if (!is_valid_blkaddr(sbi, blkno, type))
 175                         goto out;
 176
 177                 switch (type) {
 178                 case META_NAT:
 179                         if (unlikely(blkno >=
 180                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 181                                 blkno = 0;
 182                         /* get nat block addr */
 183                         fio.new_blkaddr = current_nat_addr(sbi,
 184                                         blkno * NAT_ENTRY_PER_BLOCK);
 185                         break;
 186                 case META_SIT:
 187                         /* get sit block addr */
 188                         fio.new_blkaddr = current_sit_addr(sbi,
 189                                         blkno * SIT_ENTRY_PER_BLOCK);
 190                         break;
 191                 case META_SSA:
 192                 case META_CP:
 193                 case META_POR:
 194                         fio.new_blkaddr = blkno;
 195                         break;
 196                 default:
 197                         BUG();
 198                 }
 199
 200                 page = f2fs_grab_cache_page(META_MAPPING(sbi),
 201                                                 fio.new_blkaddr, false);
 202                 if (!page)
 203                         continue;
 204                 if (PageUptodate(page)) {
 205                         f2fs_put_page(page, 1);
 206                         continue;
 207                 }
 208
 209                 fio.page = page;
 210                 f2fs_submit_page_bio(&fio);
 211                 f2fs_put_page(page, 0);
 212         }
 213 out:
 214         blk_finish_plug(&plug);
 215         return blkno - start;
 216 }
 217
 218 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 219 {
 220         struct page *page;
 221         bool readahead = false;
 222
 223         page = find_get_page(META_MAPPING(sbi), index);
 224         if (!page || !PageUptodate(page))
 225                 readahead = true;
 226         f2fs_put_page(page, 0);
 227
 228         if (readahead)
 229                 ra_meta_pages(sbi, index, BIO_MAX_PAGES, META_POR, true);
 230 }
 231
 232 static int __f2fs_write_meta_page(struct page *page,
 233                                 struct writeback_control *wbc,
 234                                 enum iostat_type io_type)
 235 {
 236         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 237
 238         trace_f2fs_writepage(page, META);
 239
 240         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 241                 goto redirty_out;
 242         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 243                 goto redirty_out;
 244         if (unlikely(f2fs_cp_error(sbi)))
 245                 goto redirty_out;
 246
 247         write_meta_page(sbi, page, io_type);
 248         dec_page_count(sbi, F2FS_DIRTY_META);
 249
 250         if (wbc->for_reclaim)
 251                 f2fs_submit_merged_write_cond(sbi, page->mapping->host,
 252                                                 0, page->index, META);
 253
 254         unlock_page(page);
 255
 256         if (unlikely(f2fs_cp_error(sbi)))
 257                 f2fs_submit_merged_write(sbi, META);
 258
 259         return 0;
 260
 261 redirty_out:
 262         redirty_page_for_writepage(wbc, page);
 263         return AOP_WRITEPAGE_ACTIVATE;
 264 }
 265
 266 static int f2fs_write_meta_page(struct page *page,
 267                                 struct writeback_control *wbc)
 268 {
 269         return __f2fs_write_meta_page(page, wbc, FS_META_IO);
 270 }
 271
 272 static int f2fs_write_meta_pages(struct address_space *mapping,
 273                                 struct writeback_control *wbc)
 274 {
 275         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 276         long diff, written;
 277
 278         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 279                 goto skip_write;
 280
 281         /* collect a number of dirty meta pages and write together */
 282         if (wbc->for_kupdate ||
 283                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 284                 goto skip_write;
 285
 286         /* if locked failed, cp will flush dirty pages instead */
 287         if (!mutex_trylock(&sbi->cp_mutex))
 288                 goto skip_write;
 289
 290         trace_f2fs_writepages(mapping->host, wbc, META);
 291         diff = nr_pages_to_write(sbi, META, wbc);
 292         written = sync_meta_pages(sbi, META, wbc->nr_to_write, FS_META_IO);
 293         mutex_unlock(&sbi->cp_mutex);
 294         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 295         return 0;
 296
 297 skip_write:
 298         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 299         trace_f2fs_writepages(mapping->host, wbc, META);
 300         return 0;
 301 }
 302
 303 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 304                                 long nr_to_write, enum iostat_type io_type)
 305 {
 306         struct address_space *mapping = META_MAPPING(sbi);
 307         pgoff_t index = 0, prev = ULONG_MAX;
 308         struct pagevec pvec;
 309         long nwritten = 0;
 310         int nr_pages;
 311         struct writeback_control wbc = {
 312                 .for_reclaim = 0,
 313         };
 314         struct blk_plug plug;
 315
 316         pagevec_init(&pvec);
 317
 318         blk_start_plug(&plug);
 319
 320         while ((nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 321                                 PAGECACHE_TAG_DIRTY))) {
 322                 int i;
 323
 324                 for (i = 0; i < nr_pages; i++) {
 325                         struct page *page = pvec.pages[i];
 326
 327                         if (prev == ULONG_MAX)
 328                                 prev = page->index - 1;
 329                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 330                                 pagevec_release(&pvec);
 331                                 goto stop;
 332                         }
 333
 334                         lock_page(page);
 335
 336                         if (unlikely(page->mapping != mapping)) {
 337 continue_unlock:
 338                                 unlock_page(page);
 339                                 continue;
 340                         }
 341                         if (!PageDirty(page)) {
 342                                 /* someone wrote it for us */
 343                                 goto continue_unlock;
 344                         }
 345
 346                         f2fs_wait_on_page_writeback(page, META, true);
 347
 348                         BUG_ON(PageWriteback(page));
 349                         if (!clear_page_dirty_for_io(page))
 350                                 goto continue_unlock;
 351
 352                         if (__f2fs_write_meta_page(page, &wbc, io_type)) {
 353                                 unlock_page(page);
 354                                 break;
 355                         }
 356                         nwritten++;
 357                         prev = page->index;
 358                         if (unlikely(nwritten >= nr_to_write))
 359                                 break;
 360                 }
 361                 pagevec_release(&pvec);
 362                 cond_resched();
 363         }
 364 stop:
 365         if (nwritten)
 366                 f2fs_submit_merged_write(sbi, type);
 367
 368         blk_finish_plug(&plug);
 369
 370         return nwritten;
 371 }
 372
 373 static int f2fs_set_meta_page_dirty(struct page *page)
 374 {
 375         trace_f2fs_set_page_dirty(page, META);
 376
 377         if (!PageUptodate(page))
 378                 SetPageUptodate(page);
 379         if (!PageDirty(page)) {
 380                 f2fs_set_page_dirty_nobuffers(page);
 381                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 382                 SetPagePrivate(page);
 383                 f2fs_trace_pid(page);
 384                 return 1;
 385         }
 386         return 0;
 387 }
 388
 389 const struct address_space_operations f2fs_meta_aops = {
 390         .writepage      = f2fs_write_meta_page,
 391         .writepages     = f2fs_write_meta_pages,
 392         .set_page_dirty = f2fs_set_meta_page_dirty,
 393         .invalidatepage = f2fs_invalidate_page,
 394         .releasepage    = f2fs_release_page,
 395 #ifdef CONFIG_MIGRATION
 396         .migratepage    = f2fs_migrate_page,
 397 #endif
 398 };
 399
 400 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino,
 401                                                 unsigned int devidx, int type)
 402 {
 403         struct inode_management *im = &sbi->im[type];
 404         struct ino_entry *e, *tmp;
 405
 406         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 407
 408         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 409
 410         spin_lock(&im->ino_lock);
 411         e = radix_tree_lookup(&im->ino_root, ino);
 412         if (!e) {
 413                 e = tmp;
 414                 if (unlikely(radix_tree_insert(&im->ino_root, ino, e)))
 415                         f2fs_bug_on(sbi, 1);
 416
 417                 memset(e, 0, sizeof(struct ino_entry));
 418                 e->ino = ino;
 419
 420                 list_add_tail(&e->list, &im->ino_list);
 421                 if (type != ORPHAN_INO)
 422                         im->ino_num++;
 423         }
 424
 425         if (type == FLUSH_INO)
 426                 f2fs_set_bit(devidx, (char *)&e->dirty_device);
 427
 428         spin_unlock(&im->ino_lock);
 429         radix_tree_preload_end();
 430
 431         if (e != tmp)
 432                 kmem_cache_free(ino_entry_slab, tmp);
 433 }
 434
 435 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 436 {
 437         struct inode_management *im = &sbi->im[type];
 438         struct ino_entry *e;
 439
 440         spin_lock(&im->ino_lock);
 441         e = radix_tree_lookup(&im->ino_root, ino);
 442         if (e) {
 443                 list_del(&e->list);
 444                 radix_tree_delete(&im->ino_root, ino);
 445                 im->ino_num--;
 446                 spin_unlock(&im->ino_lock);
 447                 kmem_cache_free(ino_entry_slab, e);
 448                 return;
 449         }
 450         spin_unlock(&im->ino_lock);
 451 }
 452
 453 void add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 454 {
 455         /* add new dirty ino entry into list */
 456         __add_ino_entry(sbi, ino, 0, type);
 457 }
 458
 459 void remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 460 {
 461         /* remove dirty ino entry from list */
 462         __remove_ino_entry(sbi, ino, type);
 463 }
 464
 465 /* mode should be APPEND_INO or UPDATE_INO */
 466 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 467 {
 468         struct inode_management *im = &sbi->im[mode];
 469         struct ino_entry *e;
 470
 471         spin_lock(&im->ino_lock);
 472         e = radix_tree_lookup(&im->ino_root, ino);
 473         spin_unlock(&im->ino_lock);
 474         return e ? true : false;
 475 }
 476
 477 void release_ino_entry(struct f2fs_sb_info *sbi, bool all)
 478 {
 479         struct ino_entry *e, *tmp;
 480         int i;
 481
 482         for (i = all ? ORPHAN_INO : APPEND_INO; i < MAX_INO_ENTRY; i++) {
 483                 struct inode_management *im = &sbi->im[i];
 484
 485                 spin_lock(&im->ino_lock);
 486                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 487                         list_del(&e->list);
 488                         radix_tree_delete(&im->ino_root, e->ino);
 489                         kmem_cache_free(ino_entry_slab, e);
 490                         im->ino_num--;
 491                 }
 492                 spin_unlock(&im->ino_lock);
 493         }
 494 }
 495
 496 void set_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 497                                         unsigned int devidx, int type)
 498 {
 499         __add_ino_entry(sbi, ino, devidx, type);
 500 }
 501
 502 bool is_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 503                                         unsigned int devidx, int type)
 504 {
 505         struct inode_management *im = &sbi->im[type];
 506         struct ino_entry *e;
 507         bool is_dirty = false;
 508
 509         spin_lock(&im->ino_lock);
 510         e = radix_tree_lookup(&im->ino_root, ino);
 511         if (e && f2fs_test_bit(devidx, (char *)&e->dirty_device))
 512                 is_dirty = true;
 513         spin_unlock(&im->ino_lock);
 514         return is_dirty;
 515 }
 516
 517 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 518 {
 519         struct inode_management *im = &sbi->im[ORPHAN_INO];
 520         int err = 0;
 521
 522         spin_lock(&im->ino_lock);
 523
 524 #ifdef CONFIG_F2FS_FAULT_INJECTION
 525         if (time_to_inject(sbi, FAULT_ORPHAN)) {
 526                 spin_unlock(&im->ino_lock);
 527                 f2fs_show_injection_info(FAULT_ORPHAN);
 528                 return -ENOSPC;
 529         }
 530 #endif
 531         if (unlikely(im->ino_num >= sbi->max_orphans))
 532                 err = -ENOSPC;
 533         else
 534                 im->ino_num++;
 535         spin_unlock(&im->ino_lock);
 536
 537         return err;
 538 }
 539
 540 void release_orphan_inode(struct f2fs_sb_info *sbi)
 541 {
 542         struct inode_management *im = &sbi->im[ORPHAN_INO];
 543
 544         spin_lock(&im->ino_lock);
 545         f2fs_bug_on(sbi, im->ino_num == 0);
 546         im->ino_num--;
 547         spin_unlock(&im->ino_lock);
 548 }
 549
 550 void add_orphan_inode(struct inode *inode)
 551 {
 552         /* add new orphan ino entry into list */
 553         __add_ino_entry(F2FS_I_SB(inode), inode->i_ino, 0, ORPHAN_INO);
 554         update_inode_page(inode);
 555 }
 556
 557 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 558 {
 559         /* remove orphan entry from orphan list */
 560         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 561 }
 562
 563 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 564 {
 565         struct inode *inode;
 566         struct node_info ni;
 567         int err = acquire_orphan_inode(sbi);
 568
 569         if (err) {
 570                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 571                 f2fs_msg(sbi->sb, KERN_WARNING,
 572                                 "%s: orphan failed (ino=%x), run fsck to fix.",
 573                                 __func__, ino);
 574                 return err;
 575         }
 576
 577         __add_ino_entry(sbi, ino, 0, ORPHAN_INO);
 578
 579         inode = f2fs_iget_retry(sbi->sb, ino);
 580         if (IS_ERR(inode)) {
 581                 /*
 582                  * there should be a bug that we can't find the entry
 583                  * to orphan inode.
 584                  */
 585                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 586                 return PTR_ERR(inode);
 587         }
 588
 589         clear_nlink(inode);
 590
 591         /* truncate all the data during iput */
 592         iput(inode);
 593
 594         get_node_info(sbi, ino, &ni);
 595
 596         /* ENOMEM was fully retried in f2fs_evict_inode. */
 597         if (ni.blk_addr != NULL_ADDR) {
 598                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 599                 f2fs_msg(sbi->sb, KERN_WARNING,
 600                         "%s: orphan failed (ino=%x) by kernel, retry mount.",
 601                                 __func__, ino);
 602                 return -EIO;
 603         }
 604         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 605         return 0;
 606 }
 607
 608 int recover_orphan_inodes(struct f2fs_sb_info *sbi)
 609 {
 610         block_t start_blk, orphan_blocks, i, j;
 611         unsigned int s_flags = sbi->sb->s_flags;
 612         int err = 0;
 613 #ifdef CONFIG_QUOTA
 614         int quota_enabled;
 615 #endif
 616
 617         if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG))
 618                 return 0;
 619
 620         if (s_flags & MS_RDONLY) {
 621                 f2fs_msg(sbi->sb, KERN_INFO, "orphan cleanup on readonly fs");
 622                 sbi->sb->s_flags &= ~MS_RDONLY;
 623         }
 624
 625 #ifdef CONFIG_QUOTA
 626         /* Needed for iput() to work correctly and not trash data */
 627         sbi->sb->s_flags |= MS_ACTIVE;
 628
 629         /* Turn on quotas so that they are updated correctly */
 630         quota_enabled = f2fs_enable_quota_files(sbi, s_flags & MS_RDONLY);
 631 #endif
 632
 633         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 634         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 635
 636         ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 637
 638         for (i = 0; i < orphan_blocks; i++) {
 639                 struct page *page = get_meta_page(sbi, start_blk + i);
 640                 struct f2fs_orphan_block *orphan_blk;
 641
 642                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 643                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 644                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 645                         err = recover_orphan_inode(sbi, ino);
 646                         if (err) {
 647                                 f2fs_put_page(page, 1);
 648                                 goto out;
 649                         }
 650                 }
 651                 f2fs_put_page(page, 1);
 652         }
 653         /* clear Orphan Flag */
 654         clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG);
 655 out:
 656 #ifdef CONFIG_QUOTA
 657         /* Turn quotas off */
 658         if (quota_enabled)
 659                 f2fs_quota_off_umount(sbi->sb);
 660 #endif
 661         sbi->sb->s_flags = s_flags; /* Restore MS_RDONLY status */
 662
 663         return err;
 664 }
 665
 666 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 667 {
 668         struct list_head *head;
 669         struct f2fs_orphan_block *orphan_blk = NULL;
 670         unsigned int nentries = 0;
 671         unsigned short index = 1;
 672         unsigned short orphan_blocks;
 673         struct page *page = NULL;
 674         struct ino_entry *orphan = NULL;
 675         struct inode_management *im = &sbi->im[ORPHAN_INO];
 676
 677         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 678
 679         /*
 680          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 681          * orphan inode operations are covered under f2fs_lock_op().
 682          * And, spin_lock should be avoided due to page operations below.
 683          */
 684         head = &im->ino_list;
 685
 686         /* loop for each orphan inode entry and write them in Jornal block */
 687         list_for_each_entry(orphan, head, list) {
 688                 if (!page) {
 689                         page = grab_meta_page(sbi, start_blk++);
 690                         orphan_blk =
 691                                 (struct f2fs_orphan_block *)page_address(page);
 692                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 693                 }
 694
 695                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 696
 697                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 698                         /*
 699                          * an orphan block is full of 1020 entries,
 700                          * then we need to flush current orphan blocks
 701                          * and bring another one in memory
 702                          */
 703                         orphan_blk->blk_addr = cpu_to_le16(index);
 704                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 705                         orphan_blk->entry_count = cpu_to_le32(nentries);
 706                         set_page_dirty(page);
 707                         f2fs_put_page(page, 1);
 708                         index++;
 709                         nentries = 0;
 710                         page = NULL;
 711                 }
 712         }
 713
 714         if (page) {
 715                 orphan_blk->blk_addr = cpu_to_le16(index);
 716                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 717                 orphan_blk->entry_count = cpu_to_le32(nentries);
 718                 set_page_dirty(page);
 719                 f2fs_put_page(page, 1);
 720         }
 721 }
 722
 723 static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
 724                 struct f2fs_checkpoint **cp_block, struct page **cp_page,
 725                 unsigned long long *version)
 726 {
 727         unsigned long blk_size = sbi->blocksize;
 728         size_t crc_offset = 0;
 729         __u32 crc = 0;
 730
 731         *cp_page = get_meta_page(sbi, cp_addr);
 732         *cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
 733
 734         crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
 735         if (crc_offset > (blk_size - sizeof(__le32))) {
 736                 f2fs_msg(sbi->sb, KERN_WARNING,
 737                         "invalid crc_offset: %zu", crc_offset);
 738                 return -EINVAL;
 739         }
 740
 741         crc = cur_cp_crc(*cp_block);
 742         if (!f2fs_crc_valid(sbi, crc, *cp_block, crc_offset)) {
 743                 f2fs_msg(sbi->sb, KERN_WARNING, "invalid crc value");
 744                 return -EINVAL;
 745         }
 746
 747         *version = cur_cp_version(*cp_block);
 748         return 0;
 749 }
 750
 751 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 752                                 block_t cp_addr, unsigned long long *version)
 753 {
 754         struct page *cp_page_1 = NULL, *cp_page_2 = NULL;
 755         struct f2fs_checkpoint *cp_block = NULL;
 756         unsigned long long cur_version = 0, pre_version = 0;
 757         int err;
 758
 759         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 760                                         &cp_page_1, version);
 761         if (err)
 762                 goto invalid_cp1;
 763         pre_version = *version;
 764
 765         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 766         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 767                                         &cp_page_2, version);
 768         if (err)
 769                 goto invalid_cp2;
 770         cur_version = *version;
 771
 772         if (cur_version == pre_version) {
 773                 *version = cur_version;
 774                 f2fs_put_page(cp_page_2, 1);
 775                 return cp_page_1;
 776         }
 777 invalid_cp2:
 778         f2fs_put_page(cp_page_2, 1);
 779 invalid_cp1:
 780         f2fs_put_page(cp_page_1, 1);
 781         return NULL;
 782 }
 783
 784 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 785 {
 786         struct f2fs_checkpoint *cp_block;
 787         struct f2fs_super_block *fsb = sbi->raw_super;
 788         struct page *cp1, *cp2, *cur_page;
 789         unsigned long blk_size = sbi->blocksize;
 790         unsigned long long cp1_version = 0, cp2_version = 0;
 791         unsigned long long cp_start_blk_no;
 792         unsigned int cp_blks = 1 + __cp_payload(sbi);
 793         block_t cp_blk_no;
 794         int i;
 795
 796         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 797         if (!sbi->ckpt)
 798                 return -ENOMEM;
 799         /*
 800          * Finding out valid cp block involves read both
 801          * sets( cp pack1 and cp pack 2)
 802          */
 803         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 804         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 805
 806         /* The second checkpoint pack should start at the next segment */
 807         cp_start_blk_no += ((unsigned long long)1) <<
 808                                 le32_to_cpu(fsb->log_blocks_per_seg);
 809         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 810
 811         if (cp1 && cp2) {
 812                 if (ver_after(cp2_version, cp1_version))
 813                         cur_page = cp2;
 814                 else
 815                         cur_page = cp1;
 816         } else if (cp1) {
 817                 cur_page = cp1;
 818         } else if (cp2) {
 819                 cur_page = cp2;
 820         } else {
 821                 goto fail_no_cp;
 822         }
 823
 824         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 825         memcpy(sbi->ckpt, cp_block, blk_size);
 826
 827         /* Sanity checking of checkpoint */
 828         if (sanity_check_ckpt(sbi))
 829                 goto free_fail_no_cp;
 830
 831         if (cur_page == cp1)
 832                 sbi->cur_cp_pack = 1;
 833         else
 834                 sbi->cur_cp_pack = 2;
 835
 836         if (cp_blks <= 1)
 837                 goto done;
 838
 839         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 840         if (cur_page == cp2)
 841                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 842
 843         for (i = 1; i < cp_blks; i++) {
 844                 void *sit_bitmap_ptr;
 845                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 846
 847                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 848                 sit_bitmap_ptr = page_address(cur_page);
 849                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 850                 f2fs_put_page(cur_page, 1);
 851         }
 852 done:
 853         f2fs_put_page(cp1, 1);
 854         f2fs_put_page(cp2, 1);
 855         return 0;
 856
 857 free_fail_no_cp:
 858         f2fs_put_page(cp1, 1);
 859         f2fs_put_page(cp2, 1);
 860 fail_no_cp:
 861         kfree(sbi->ckpt);
 862         return -EINVAL;
 863 }
 864
 865 static void __add_dirty_inode(struct inode *inode, enum inode_type type)
 866 {
 867         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 868         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 869
 870         if (is_inode_flag_set(inode, flag))
 871                 return;
 872
 873         set_inode_flag(inode, flag);
 874         if (!f2fs_is_volatile_file(inode))
 875                 list_add_tail(&F2FS_I(inode)->dirty_list,
 876                                                 &sbi->inode_list[type]);
 877         stat_inc_dirty_inode(sbi, type);
 878 }
 879
 880 static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
 881 {
 882         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 883
 884         if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
 885                 return;
 886
 887         list_del_init(&F2FS_I(inode)->dirty_list);
 888         clear_inode_flag(inode, flag);
 889         stat_dec_dirty_inode(F2FS_I_SB(inode), type);
 890 }
 891
 892 void update_dirty_page(struct inode *inode, struct page *page)
 893 {
 894         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 895         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 896
 897         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 898                         !S_ISLNK(inode->i_mode))
 899                 return;
 900
 901         spin_lock(&sbi->inode_lock[type]);
 902         if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
 903                 __add_dirty_inode(inode, type);
 904         inode_inc_dirty_pages(inode);
 905         spin_unlock(&sbi->inode_lock[type]);
 906
 907         SetPagePrivate(page);
 908         f2fs_trace_pid(page);
 909 }
 910
 911 void remove_dirty_inode(struct inode *inode)
 912 {
 913         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 914         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 915
 916         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 917                         !S_ISLNK(inode->i_mode))
 918                 return;
 919
 920         if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
 921                 return;
 922
 923         spin_lock(&sbi->inode_lock[type]);
 924         __remove_dirty_inode(inode, type);
 925         spin_unlock(&sbi->inode_lock[type]);
 926 }
 927
 928 int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
 929 {
 930         struct list_head *head;
 931         struct inode *inode;
 932         struct f2fs_inode_info *fi;
 933         bool is_dir = (type == DIR_INODE);
 934         unsigned long ino = 0;
 935
 936         trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
 937                                 get_pages(sbi, is_dir ?
 938                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 939 retry:
 940         if (unlikely(f2fs_cp_error(sbi)))
 941                 return -EIO;
 942
 943         spin_lock(&sbi->inode_lock[type]);
 944
 945         head = &sbi->inode_list[type];
 946         if (list_empty(head)) {
 947                 spin_unlock(&sbi->inode_lock[type]);
 948                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
 949                                 get_pages(sbi, is_dir ?
 950                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 951                 return 0;
 952         }
 953         fi = list_first_entry(head, struct f2fs_inode_info, dirty_list);
 954         inode = igrab(&fi->vfs_inode);
 955         spin_unlock(&sbi->inode_lock[type]);
 956         if (inode) {
 957                 unsigned long cur_ino = inode->i_ino;
 958
 959                 if (is_dir)
 960                         F2FS_I(inode)->cp_task = current;
 961
 962                 filemap_fdatawrite(inode->i_mapping);
 963
 964                 if (is_dir)
 965                         F2FS_I(inode)->cp_task = NULL;
 966
 967                 iput(inode);
 968                 /* We need to give cpu to another writers. */
 969                 if (ino == cur_ino) {
 970                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 971                         cond_resched();
 972                 } else {
 973                         ino = cur_ino;
 974                 }
 975         } else {
 976                 /*
 977                  * We should submit bio, since it exists several
 978                  * wribacking dentry pages in the freeing inode.
 979                  */
 980                 f2fs_submit_merged_write(sbi, DATA);
 981                 cond_resched();
 982         }
 983         goto retry;
 984 }
 985
 986 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
 987 {
 988         struct list_head *head = &sbi->inode_list[DIRTY_META];
 989         struct inode *inode;
 990         struct f2fs_inode_info *fi;
 991         s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
 992
 993         while (total--) {
 994                 if (unlikely(f2fs_cp_error(sbi)))
 995                         return -EIO;
 996
 997                 spin_lock(&sbi->inode_lock[DIRTY_META]);
 998                 if (list_empty(head)) {
 999                         spin_unlock(&sbi->inode_lock[DIRTY_META]);
1000                         return 0;
1001                 }
1002                 fi = list_first_entry(head, struct f2fs_inode_info,
1003                                                         gdirty_list);
1004                 inode = igrab(&fi->vfs_inode);
1005                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
1006                 if (inode) {
1007                         sync_inode_metadata(inode, 0);
1008
1009                         /* it's on eviction */
1010                         if (is_inode_flag_set(inode, FI_DIRTY_INODE))
1011                                 update_inode_page(inode);
1012                         iput(inode);
1013                 }
1014         }
1015         return 0;
1016 }
1017
1018 static void __prepare_cp_block(struct f2fs_sb_info *sbi)
1019 {
1020         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1021         struct f2fs_nm_info *nm_i = NM_I(sbi);
1022         nid_t last_nid = nm_i->next_scan_nid;
1023
1024         next_free_nid(sbi, &last_nid);
1025         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
1026         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
1027         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
1028         ckpt->next_free_nid = cpu_to_le32(last_nid);
1029 }
1030
1031 /*
1032  * Freeze all the FS-operations for checkpoint.
1033  */
1034 static int block_operations(struct f2fs_sb_info *sbi)
1035 {
1036         struct writeback_control wbc = {
1037                 .sync_mode = WB_SYNC_ALL,
1038                 .nr_to_write = LONG_MAX,
1039                 .for_reclaim = 0,
1040         };
1041         struct blk_plug plug;
1042         int err = 0;
1043
1044         blk_start_plug(&plug);
1045
1046 retry_flush_dents:
1047         f2fs_lock_all(sbi);
1048         /* write all the dirty dentry pages */
1049         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
1050                 f2fs_unlock_all(sbi);
1051                 err = sync_dirty_inodes(sbi, DIR_INODE);
1052                 if (err)
1053                         goto out;
1054                 cond_resched();
1055                 goto retry_flush_dents;
1056         }
1057
1058         /*
1059          * POR: we should ensure that there are no dirty node pages
1060          * until finishing nat/sit flush. inode->i_blocks can be updated.
1061          */
1062         down_write(&sbi->node_change);
1063
1064         if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
1065                 up_write(&sbi->node_change);
1066                 f2fs_unlock_all(sbi);
1067                 err = f2fs_sync_inode_meta(sbi);
1068                 if (err)
1069                         goto out;
1070                 cond_resched();
1071                 goto retry_flush_dents;
1072         }
1073
1074 retry_flush_nodes:
1075         down_write(&sbi->node_write);
1076
1077         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
1078                 up_write(&sbi->node_write);
1079                 err = sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO);
1080                 if (err) {
1081                         up_write(&sbi->node_change);
1082                         f2fs_unlock_all(sbi);
1083                         goto out;
1084                 }
1085                 cond_resched();
1086                 goto retry_flush_nodes;
1087         }
1088
1089         /*
1090          * sbi->node_change is used only for AIO write_begin path which produces
1091          * dirty node blocks and some checkpoint values by block allocation.
1092          */
1093         __prepare_cp_block(sbi);
1094         up_write(&sbi->node_change);
1095 out:
1096         blk_finish_plug(&plug);
1097         return err;
1098 }
1099
1100 static void unblock_operations(struct f2fs_sb_info *sbi)
1101 {
1102         up_write(&sbi->node_write);
1103         f2fs_unlock_all(sbi);
1104 }
1105
1106 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
1107 {
1108         DEFINE_WAIT(wait);
1109
1110         for (;;) {
1111                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
1112
1113                 if (!get_pages(sbi, F2FS_WB_CP_DATA))
1114                         break;
1115
1116                 io_schedule_timeout(5*HZ);
1117         }
1118         finish_wait(&sbi->cp_wait, &wait);
1119 }
1120
1121 static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1122 {
1123         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
1124         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1125         unsigned long flags;
1126
1127         spin_lock_irqsave(&sbi->cp_lock, flags);
1128
1129         if ((cpc->reason & CP_UMOUNT) &&
1130                         le32_to_cpu(ckpt->cp_pack_total_block_count) >
1131                         sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks)
1132                 disable_nat_bits(sbi, false);
1133
1134         if (cpc->reason & CP_TRIMMED)
1135                 __set_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1136
1137         if (cpc->reason & CP_UMOUNT)
1138                 __set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1139         else
1140                 __clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1141
1142         if (cpc->reason & CP_FASTBOOT)
1143                 __set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1144         else
1145                 __clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1146
1147         if (orphan_num)
1148                 __set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1149         else
1150                 __clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1151
1152         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1153                 __set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1154
1155         /* set this flag to activate crc|cp_ver for recovery */
1156         __set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
1157
1158         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1159 }
1160
1161 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1162 {
1163         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1164         struct f2fs_nm_info *nm_i = NM_I(sbi);
1165         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num, flags;
1166         block_t start_blk;
1167         unsigned int data_sum_blocks, orphan_blocks;
1168         __u32 crc32 = 0;
1169         int i;
1170         int cp_payload_blks = __cp_payload(sbi);
1171         struct super_block *sb = sbi->sb;
1172         struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
1173         u64 kbytes_written;
1174         int err;
1175
1176         /* Flush all the NAT/SIT pages */
1177         while (get_pages(sbi, F2FS_DIRTY_META)) {
1178                 sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1179                 if (unlikely(f2fs_cp_error(sbi)))
1180                         return -EIO;
1181         }
1182
1183         /*
1184          * modify checkpoint
1185          * version number is already updated
1186          */
1187         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
1188         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
1189         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
1190                 ckpt->cur_node_segno[i] =
1191                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
1192                 ckpt->cur_node_blkoff[i] =
1193                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
1194                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
1195                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
1196         }
1197         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
1198                 ckpt->cur_data_segno[i] =
1199                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
1200                 ckpt->cur_data_blkoff[i] =
1201                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
1202                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
1203                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
1204         }
1205
1206         /* 2 cp  + n data seg summary + orphan inode blocks */
1207         data_sum_blocks = npages_for_summary_flush(sbi, false);
1208         spin_lock_irqsave(&sbi->cp_lock, flags);
1209         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
1210                 __set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1211         else
1212                 __clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1213         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1214
1215         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
1216         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
1217                         orphan_blocks);
1218
1219         if (__remain_node_summaries(cpc->reason))
1220                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
1221                                 cp_payload_blks + data_sum_blocks +
1222                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
1223         else
1224                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1225                                 cp_payload_blks + data_sum_blocks +
1226                                 orphan_blocks);
1227
1228         /* update ckpt flag for checkpoint */
1229         update_ckpt_flags(sbi, cpc);
1230
1231         /* update SIT/NAT bitmap */
1232         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1233         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1234
1235         crc32 = f2fs_crc32(sbi, ckpt, le32_to_cpu(ckpt->checksum_offset));
1236         *((__le32 *)((unsigned char *)ckpt +
1237                                 le32_to_cpu(ckpt->checksum_offset)))
1238                                 = cpu_to_le32(crc32);
1239
1240         start_blk = __start_cp_next_addr(sbi);
1241
1242         /* write nat bits */
1243         if (enabled_nat_bits(sbi, cpc)) {
1244                 __u64 cp_ver = cur_cp_version(ckpt);
1245                 block_t blk;
1246
1247                 cp_ver |= ((__u64)crc32 << 32);
1248                 *(__le64 *)nm_i->nat_bits = cpu_to_le64(cp_ver);
1249
1250                 blk = start_blk + sbi->blocks_per_seg - nm_i->nat_bits_blocks;
1251                 for (i = 0; i < nm_i->nat_bits_blocks; i++)
1252                         update_meta_page(sbi, nm_i->nat_bits +
1253                                         (i << F2FS_BLKSIZE_BITS), blk + i);
1254
1255                 /* Flush all the NAT BITS pages */
1256                 while (get_pages(sbi, F2FS_DIRTY_META)) {
1257                         sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1258                         if (unlikely(f2fs_cp_error(sbi)))
1259                                 return -EIO;
1260                 }
1261         }
1262
1263         /* need to wait for end_io results */
1264         wait_on_all_pages_writeback(sbi);
1265         if (unlikely(f2fs_cp_error(sbi)))
1266                 return -EIO;
1267
1268         /* flush all device cache */
1269         err = f2fs_flush_device_cache(sbi);
1270         if (err)
1271                 return err;
1272
1273         /* write out checkpoint buffer at block 0 */
1274         update_meta_page(sbi, ckpt, start_blk++);
1275
1276         for (i = 1; i < 1 + cp_payload_blks; i++)
1277                 update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1278                                                         start_blk++);
1279
1280         if (orphan_num) {
1281                 write_orphan_inodes(sbi, start_blk);
1282                 start_blk += orphan_blocks;
1283         }
1284
1285         write_data_summaries(sbi, start_blk);
1286         start_blk += data_sum_blocks;
1287
1288         /* Record write statistics in the hot node summary */
1289         kbytes_written = sbi->kbytes_written;
1290         if (sb->s_bdev->bd_part)
1291                 kbytes_written += BD_PART_WRITTEN(sbi);
1292
1293         seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
1294
1295         if (__remain_node_summaries(cpc->reason)) {
1296                 write_node_summaries(sbi, start_blk);
1297                 start_blk += NR_CURSEG_NODE_TYPE;
1298         }
1299
1300         /* writeout checkpoint block */
1301         update_meta_page(sbi, ckpt, start_blk);
1302
1303         /* wait for previous submitted node/meta pages writeback */
1304         wait_on_all_pages_writeback(sbi);
1305
1306         if (unlikely(f2fs_cp_error(sbi)))
1307                 return -EIO;
1308
1309         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LLONG_MAX);
1310         filemap_fdatawait_range(META_MAPPING(sbi), 0, LLONG_MAX);
1311
1312         /* update user_block_counts */
1313         sbi->last_valid_block_count = sbi->total_valid_block_count;
1314         percpu_counter_set(&sbi->alloc_valid_block_count, 0);
1315
1316         /* Here, we only have one bio having CP pack */
1317         sync_meta_pages(sbi, META_FLUSH, LONG_MAX, FS_CP_META_IO);
1318
1319         /* wait for previous submitted meta pages writeback */
1320         wait_on_all_pages_writeback(sbi);
1321
1322         release_ino_entry(sbi, false);
1323
1324         if (unlikely(f2fs_cp_error(sbi)))
1325                 return -EIO;
1326
1327         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1328         clear_sbi_flag(sbi, SBI_NEED_CP);
1329         __set_cp_next_pack(sbi);
1330
1331         /*
1332          * redirty superblock if metadata like node page or inode cache is
1333          * updated during writing checkpoint.
1334          */
1335         if (get_pages(sbi, F2FS_DIRTY_NODES) ||
1336                         get_pages(sbi, F2FS_DIRTY_IMETA))
1337                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1338
1339         f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS));
1340
1341         return 0;
1342 }
1343
1344 /*
1345  * We guarantee that this checkpoint procedure will not fail.
1346  */
1347 int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1348 {
1349         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1350         unsigned long long ckpt_ver;
1351         int err = 0;
1352
1353         mutex_lock(&sbi->cp_mutex);
1354
1355         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1356                 ((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) ||
1357                 ((cpc->reason & CP_DISCARD) && !sbi->discard_blks)))
1358                 goto out;
1359         if (unlikely(f2fs_cp_error(sbi))) {
1360                 err = -EIO;
1361                 goto out;
1362         }
1363         if (f2fs_readonly(sbi->sb)) {
1364                 err = -EROFS;
1365                 goto out;
1366         }
1367
1368         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1369
1370         err = block_operations(sbi);
1371         if (err)
1372                 goto out;
1373
1374         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1375
1376         f2fs_flush_merged_writes(sbi);
1377
1378         /* this is the case of multiple fstrims without any changes */
1379         if (cpc->reason & CP_DISCARD) {
1380                 if (!exist_trim_candidates(sbi, cpc)) {
1381                         unblock_operations(sbi);
1382                         goto out;
1383                 }
1384
1385                 if (NM_I(sbi)->dirty_nat_cnt == 0 &&
1386                                 SIT_I(sbi)->dirty_sentries == 0 &&
1387                                 prefree_segments(sbi) == 0) {
1388                         flush_sit_entries(sbi, cpc);
1389                         clear_prefree_segments(sbi, cpc);
1390                         unblock_operations(sbi);
1391                         goto out;
1392                 }
1393         }
1394
1395         /*
1396          * update checkpoint pack index
1397          * Increase the version number so that
1398          * SIT entries and seg summaries are written at correct place
1399          */
1400         ckpt_ver = cur_cp_version(ckpt);
1401         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1402
1403         /* write cached NAT/SIT entries to NAT/SIT area */
1404         flush_nat_entries(sbi, cpc);
1405         flush_sit_entries(sbi, cpc);
1406
1407         /* unlock all the fs_lock[] in do_checkpoint() */
1408         err = do_checkpoint(sbi, cpc);
1409         if (err)
1410                 release_discard_addrs(sbi);
1411         else
1412                 clear_prefree_segments(sbi, cpc);
1413
1414         unblock_operations(sbi);
1415         stat_inc_cp_count(sbi->stat_info);
1416
1417         if (cpc->reason & CP_RECOVERY)
1418                 f2fs_msg(sbi->sb, KERN_NOTICE,
1419                         "checkpoint: version = %llx", ckpt_ver);
1420
1421         /* do checkpoint periodically */
1422         f2fs_update_time(sbi, CP_TIME);
1423         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1424 out:
1425         mutex_unlock(&sbi->cp_mutex);
1426         return err;
1427 }
1428
1429 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1430 {
1431         int i;
1432
1433         for (i = 0; i < MAX_INO_ENTRY; i++) {
1434                 struct inode_management *im = &sbi->im[i];
1435
1436                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1437                 spin_lock_init(&im->ino_lock);
1438                 INIT_LIST_HEAD(&im->ino_list);
1439                 im->ino_num = 0;
1440         }
1441
1442         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1443                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1444                                 F2FS_ORPHANS_PER_BLOCK;
1445 }
1446
1447 int __init create_checkpoint_caches(void)
1448 {
1449         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1450                         sizeof(struct ino_entry));
1451         if (!ino_entry_slab)
1452                 return -ENOMEM;
1453         inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1454                         sizeof(struct inode_entry));
1455         if (!inode_entry_slab) {
1456                 kmem_cache_destroy(ino_entry_slab);
1457                 return -ENOMEM;
1458         }
1459         return 0;
1460 }
1461
1462 void destroy_checkpoint_caches(void)
1463 {
1464         kmem_cache_destroy(ino_entry_slab);
1465         kmem_cache_destroy(inode_entry_slab);
1466 }