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         sbi->sb->s_flags |= MS_RDONLY;
  33         if (!end_io)
  34                 f2fs_flush_merged_bios(sbi);
  35 }
  36
  37 /*
  38  * We guarantee no failure on the returned page.
  39  */
  40 struct page *grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  41 {
  42         struct address_space *mapping = META_MAPPING(sbi);
  43         struct page *page = NULL;
  44 repeat:
  45         page = f2fs_grab_cache_page(mapping, index, false);
  46         if (!page) {
  47                 cond_resched();
  48                 goto repeat;
  49         }
  50         f2fs_wait_on_page_writeback(page, META, true);
  51         if (!PageUptodate(page))
  52                 SetPageUptodate(page);
  53         return page;
  54 }
  55
  56 /*
  57  * We guarantee no failure on the returned page.
  58  */
  59 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
  60                                                         bool is_meta)
  61 {
  62         struct address_space *mapping = META_MAPPING(sbi);
  63         struct page *page;
  64         struct f2fs_io_info fio = {
  65                 .sbi = sbi,
  66                 .type = META,
  67                 .op = REQ_OP_READ,
  68                 .op_flags = REQ_META | REQ_PRIO,
  69                 .old_blkaddr = index,
  70                 .new_blkaddr = index,
  71                 .encrypted_page = NULL,
  72         };
  73
  74         if (unlikely(!is_meta))
  75                 fio.op_flags &= ~REQ_META;
  76 repeat:
  77         page = f2fs_grab_cache_page(mapping, index, false);
  78         if (!page) {
  79                 cond_resched();
  80                 goto repeat;
  81         }
  82         if (PageUptodate(page))
  83                 goto out;
  84
  85         fio.page = page;
  86
  87         if (f2fs_submit_page_bio(&fio)) {
  88                 f2fs_put_page(page, 1);
  89                 goto repeat;
  90         }
  91
  92         lock_page(page);
  93         if (unlikely(page->mapping != mapping)) {
  94                 f2fs_put_page(page, 1);
  95                 goto repeat;
  96         }
  97
  98         /*
  99          * if there is any IO error when accessing device, make our filesystem
 100          * readonly and make sure do not write checkpoint with non-uptodate
 101          * meta page.
 102          */
 103         if (unlikely(!PageUptodate(page)))
 104                 f2fs_stop_checkpoint(sbi, false);
 105 out:
 106         return page;
 107 }
 108
 109 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 110 {
 111         return __get_meta_page(sbi, index, true);
 112 }
 113
 114 /* for POR only */
 115 struct page *get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 116 {
 117         return __get_meta_page(sbi, index, false);
 118 }
 119
 120 bool is_valid_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type)
 121 {
 122         switch (type) {
 123         case META_NAT:
 124                 break;
 125         case META_SIT:
 126                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 127                         return false;
 128                 break;
 129         case META_SSA:
 130                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 131                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 132                         return false;
 133                 break;
 134         case META_CP:
 135                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 136                         blkaddr < __start_cp_addr(sbi)))
 137                         return false;
 138                 break;
 139         case META_POR:
 140                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 141                         blkaddr < MAIN_BLKADDR(sbi)))
 142                         return false;
 143                 break;
 144         default:
 145                 BUG();
 146         }
 147
 148         return true;
 149 }
 150
 151 /*
 152  * Readahead CP/NAT/SIT/SSA pages
 153  */
 154 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 155                                                         int type, bool sync)
 156 {
 157         struct page *page;
 158         block_t blkno = start;
 159         struct f2fs_io_info fio = {
 160                 .sbi = sbi,
 161                 .type = META,
 162                 .op = REQ_OP_READ,
 163                 .op_flags = sync ? (REQ_META | REQ_PRIO) : REQ_RAHEAD,
 164                 .encrypted_page = NULL,
 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                 fio.old_blkaddr = fio.new_blkaddr;
 211                 f2fs_submit_page_mbio(&fio);
 212                 f2fs_put_page(page, 0);
 213         }
 214 out:
 215         f2fs_submit_merged_bio(sbi, META, READ);
 216         blk_finish_plug(&plug);
 217         return blkno - start;
 218 }
 219
 220 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 221 {
 222         struct page *page;
 223         bool readahead = false;
 224
 225         page = find_get_page(META_MAPPING(sbi), index);
 226         if (!page || !PageUptodate(page))
 227                 readahead = true;
 228         f2fs_put_page(page, 0);
 229
 230         if (readahead)
 231                 ra_meta_pages(sbi, index, BIO_MAX_PAGES, META_POR, true);
 232 }
 233
 234 static int f2fs_write_meta_page(struct page *page,
 235                                 struct writeback_control *wbc)
 236 {
 237         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 238
 239         trace_f2fs_writepage(page, META);
 240
 241         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 242                 goto redirty_out;
 243         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 244                 goto redirty_out;
 245         if (unlikely(f2fs_cp_error(sbi)))
 246                 goto redirty_out;
 247
 248         write_meta_page(sbi, page);
 249         dec_page_count(sbi, F2FS_DIRTY_META);
 250
 251         if (wbc->for_reclaim)
 252                 f2fs_submit_merged_bio_cond(sbi, page->mapping->host,
 253                                                 0, page->index, META, WRITE);
 254
 255         unlock_page(page);
 256
 257         if (unlikely(f2fs_cp_error(sbi)))
 258                 f2fs_submit_merged_bio(sbi, META, WRITE);
 259
 260         return 0;
 261
 262 redirty_out:
 263         redirty_page_for_writepage(wbc, page);
 264         return AOP_WRITEPAGE_ACTIVATE;
 265 }
 266
 267 static int f2fs_write_meta_pages(struct address_space *mapping,
 268                                 struct writeback_control *wbc)
 269 {
 270         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 271         long diff, written;
 272
 273         /* collect a number of dirty meta pages and write together */
 274         if (wbc->for_kupdate ||
 275                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 276                 goto skip_write;
 277
 278         /* if locked failed, cp will flush dirty pages instead */
 279         if (!mutex_trylock(&sbi->cp_mutex))
 280                 goto skip_write;
 281
 282         trace_f2fs_writepages(mapping->host, wbc, META);
 283         diff = nr_pages_to_write(sbi, META, wbc);
 284         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 285         mutex_unlock(&sbi->cp_mutex);
 286         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 287         return 0;
 288
 289 skip_write:
 290         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 291         trace_f2fs_writepages(mapping->host, wbc, META);
 292         return 0;
 293 }
 294
 295 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 296                                                 long nr_to_write)
 297 {
 298         struct address_space *mapping = META_MAPPING(sbi);
 299         pgoff_t index = 0, end = ULONG_MAX, prev = ULONG_MAX;
 300         struct pagevec pvec;
 301         long nwritten = 0;
 302         struct writeback_control wbc = {
 303                 .for_reclaim = 0,
 304         };
 305         struct blk_plug plug;
 306
 307         pagevec_init(&pvec, 0);
 308
 309         blk_start_plug(&plug);
 310
 311         while (index <= end) {
 312                 int i, nr_pages;
 313                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 314                                 PAGECACHE_TAG_DIRTY,
 315                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 316                 if (unlikely(nr_pages == 0))
 317                         break;
 318
 319                 for (i = 0; i < nr_pages; i++) {
 320                         struct page *page = pvec.pages[i];
 321
 322                         if (prev == ULONG_MAX)
 323                                 prev = page->index - 1;
 324                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 325                                 pagevec_release(&pvec);
 326                                 goto stop;
 327                         }
 328
 329                         lock_page(page);
 330
 331                         if (unlikely(page->mapping != mapping)) {
 332 continue_unlock:
 333                                 unlock_page(page);
 334                                 continue;
 335                         }
 336                         if (!PageDirty(page)) {
 337                                 /* someone wrote it for us */
 338                                 goto continue_unlock;
 339                         }
 340
 341                         f2fs_wait_on_page_writeback(page, META, true);
 342
 343                         BUG_ON(PageWriteback(page));
 344                         if (!clear_page_dirty_for_io(page))
 345                                 goto continue_unlock;
 346
 347                         if (mapping->a_ops->writepage(page, &wbc)) {
 348                                 unlock_page(page);
 349                                 break;
 350                         }
 351                         nwritten++;
 352                         prev = page->index;
 353                         if (unlikely(nwritten >= nr_to_write))
 354                                 break;
 355                 }
 356                 pagevec_release(&pvec);
 357                 cond_resched();
 358         }
 359 stop:
 360         if (nwritten)
 361                 f2fs_submit_merged_bio(sbi, type, WRITE);
 362
 363         blk_finish_plug(&plug);
 364
 365         return nwritten;
 366 }
 367
 368 static int f2fs_set_meta_page_dirty(struct page *page)
 369 {
 370         trace_f2fs_set_page_dirty(page, META);
 371
 372         if (!PageUptodate(page))
 373                 SetPageUptodate(page);
 374         if (!PageDirty(page)) {
 375                 f2fs_set_page_dirty_nobuffers(page);
 376                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 377                 SetPagePrivate(page);
 378                 f2fs_trace_pid(page);
 379                 return 1;
 380         }
 381         return 0;
 382 }
 383
 384 const struct address_space_operations f2fs_meta_aops = {
 385         .writepage      = f2fs_write_meta_page,
 386         .writepages     = f2fs_write_meta_pages,
 387         .set_page_dirty = f2fs_set_meta_page_dirty,
 388         .invalidatepage = f2fs_invalidate_page,
 389         .releasepage    = f2fs_release_page,
 390 #ifdef CONFIG_MIGRATION
 391         .migratepage    = f2fs_migrate_page,
 392 #endif
 393 };
 394
 395 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 396 {
 397         struct inode_management *im = &sbi->im[type];
 398         struct ino_entry *e, *tmp;
 399
 400         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 401 retry:
 402         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 403
 404         spin_lock(&im->ino_lock);
 405         e = radix_tree_lookup(&im->ino_root, ino);
 406         if (!e) {
 407                 e = tmp;
 408                 if (radix_tree_insert(&im->ino_root, ino, e)) {
 409                         spin_unlock(&im->ino_lock);
 410                         radix_tree_preload_end();
 411                         goto retry;
 412                 }
 413                 memset(e, 0, sizeof(struct ino_entry));
 414                 e->ino = ino;
 415
 416                 list_add_tail(&e->list, &im->ino_list);
 417                 if (type != ORPHAN_INO)
 418                         im->ino_num++;
 419         }
 420         spin_unlock(&im->ino_lock);
 421         radix_tree_preload_end();
 422
 423         if (e != tmp)
 424                 kmem_cache_free(ino_entry_slab, tmp);
 425 }
 426
 427 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 428 {
 429         struct inode_management *im = &sbi->im[type];
 430         struct ino_entry *e;
 431
 432         spin_lock(&im->ino_lock);
 433         e = radix_tree_lookup(&im->ino_root, ino);
 434         if (e) {
 435                 list_del(&e->list);
 436                 radix_tree_delete(&im->ino_root, ino);
 437                 im->ino_num--;
 438                 spin_unlock(&im->ino_lock);
 439                 kmem_cache_free(ino_entry_slab, e);
 440                 return;
 441         }
 442         spin_unlock(&im->ino_lock);
 443 }
 444
 445 void add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 446 {
 447         /* add new dirty ino entry into list */
 448         __add_ino_entry(sbi, ino, type);
 449 }
 450
 451 void remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 452 {
 453         /* remove dirty ino entry from list */
 454         __remove_ino_entry(sbi, ino, type);
 455 }
 456
 457 /* mode should be APPEND_INO or UPDATE_INO */
 458 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 459 {
 460         struct inode_management *im = &sbi->im[mode];
 461         struct ino_entry *e;
 462
 463         spin_lock(&im->ino_lock);
 464         e = radix_tree_lookup(&im->ino_root, ino);
 465         spin_unlock(&im->ino_lock);
 466         return e ? true : false;
 467 }
 468
 469 void release_ino_entry(struct f2fs_sb_info *sbi, bool all)
 470 {
 471         struct ino_entry *e, *tmp;
 472         int i;
 473
 474         for (i = all ? ORPHAN_INO: APPEND_INO; i <= UPDATE_INO; i++) {
 475                 struct inode_management *im = &sbi->im[i];
 476
 477                 spin_lock(&im->ino_lock);
 478                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 479                         list_del(&e->list);
 480                         radix_tree_delete(&im->ino_root, e->ino);
 481                         kmem_cache_free(ino_entry_slab, e);
 482                         im->ino_num--;
 483                 }
 484                 spin_unlock(&im->ino_lock);
 485         }
 486 }
 487
 488 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 489 {
 490         struct inode_management *im = &sbi->im[ORPHAN_INO];
 491         int err = 0;
 492
 493         spin_lock(&im->ino_lock);
 494
 495 #ifdef CONFIG_F2FS_FAULT_INJECTION
 496         if (time_to_inject(sbi, FAULT_ORPHAN)) {
 497                 spin_unlock(&im->ino_lock);
 498                 f2fs_show_injection_info(FAULT_ORPHAN);
 499                 return -ENOSPC;
 500         }
 501 #endif
 502         if (unlikely(im->ino_num >= sbi->max_orphans))
 503                 err = -ENOSPC;
 504         else
 505                 im->ino_num++;
 506         spin_unlock(&im->ino_lock);
 507
 508         return err;
 509 }
 510
 511 void release_orphan_inode(struct f2fs_sb_info *sbi)
 512 {
 513         struct inode_management *im = &sbi->im[ORPHAN_INO];
 514
 515         spin_lock(&im->ino_lock);
 516         f2fs_bug_on(sbi, im->ino_num == 0);
 517         im->ino_num--;
 518         spin_unlock(&im->ino_lock);
 519 }
 520
 521 void add_orphan_inode(struct inode *inode)
 522 {
 523         /* add new orphan ino entry into list */
 524         __add_ino_entry(F2FS_I_SB(inode), inode->i_ino, ORPHAN_INO);
 525         update_inode_page(inode);
 526 }
 527
 528 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 529 {
 530         /* remove orphan entry from orphan list */
 531         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 532 }
 533
 534 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 535 {
 536         struct inode *inode;
 537         struct node_info ni;
 538         int err = acquire_orphan_inode(sbi);
 539
 540         if (err) {
 541                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 542                 f2fs_msg(sbi->sb, KERN_WARNING,
 543                                 "%s: orphan failed (ino=%x), run fsck to fix.",
 544                                 __func__, ino);
 545                 return err;
 546         }
 547
 548         __add_ino_entry(sbi, ino, ORPHAN_INO);
 549
 550         inode = f2fs_iget_retry(sbi->sb, ino);
 551         if (IS_ERR(inode)) {
 552                 /*
 553                  * there should be a bug that we can't find the entry
 554                  * to orphan inode.
 555                  */
 556                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 557                 return PTR_ERR(inode);
 558         }
 559
 560         clear_nlink(inode);
 561
 562         /* truncate all the data during iput */
 563         iput(inode);
 564
 565         get_node_info(sbi, ino, &ni);
 566
 567         /* ENOMEM was fully retried in f2fs_evict_inode. */
 568         if (ni.blk_addr != NULL_ADDR) {
 569                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 570                 f2fs_msg(sbi->sb, KERN_WARNING,
 571                         "%s: orphan failed (ino=%x) by kernel, retry mount.",
 572                                 __func__, ino);
 573                 return -EIO;
 574         }
 575         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 576         return 0;
 577 }
 578
 579 int recover_orphan_inodes(struct f2fs_sb_info *sbi)
 580 {
 581         block_t start_blk, orphan_blocks, i, j;
 582         int err;
 583
 584         if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG))
 585                 return 0;
 586
 587         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 588         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 589
 590         ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 591
 592         for (i = 0; i < orphan_blocks; i++) {
 593                 struct page *page = get_meta_page(sbi, start_blk + i);
 594                 struct f2fs_orphan_block *orphan_blk;
 595
 596                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 597                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 598                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 599                         err = recover_orphan_inode(sbi, ino);
 600                         if (err) {
 601                                 f2fs_put_page(page, 1);
 602                                 return err;
 603                         }
 604                 }
 605                 f2fs_put_page(page, 1);
 606         }
 607         /* clear Orphan Flag */
 608         clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG);
 609         return 0;
 610 }
 611
 612 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 613 {
 614         struct list_head *head;
 615         struct f2fs_orphan_block *orphan_blk = NULL;
 616         unsigned int nentries = 0;
 617         unsigned short index = 1;
 618         unsigned short orphan_blocks;
 619         struct page *page = NULL;
 620         struct ino_entry *orphan = NULL;
 621         struct inode_management *im = &sbi->im[ORPHAN_INO];
 622
 623         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 624
 625         /*
 626          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 627          * orphan inode operations are covered under f2fs_lock_op().
 628          * And, spin_lock should be avoided due to page operations below.
 629          */
 630         head = &im->ino_list;
 631
 632         /* loop for each orphan inode entry and write them in Jornal block */
 633         list_for_each_entry(orphan, head, list) {
 634                 if (!page) {
 635                         page = grab_meta_page(sbi, start_blk++);
 636                         orphan_blk =
 637                                 (struct f2fs_orphan_block *)page_address(page);
 638                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 639                 }
 640
 641                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 642
 643                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 644                         /*
 645                          * an orphan block is full of 1020 entries,
 646                          * then we need to flush current orphan blocks
 647                          * and bring another one in memory
 648                          */
 649                         orphan_blk->blk_addr = cpu_to_le16(index);
 650                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 651                         orphan_blk->entry_count = cpu_to_le32(nentries);
 652                         set_page_dirty(page);
 653                         f2fs_put_page(page, 1);
 654                         index++;
 655                         nentries = 0;
 656                         page = NULL;
 657                 }
 658         }
 659
 660         if (page) {
 661                 orphan_blk->blk_addr = cpu_to_le16(index);
 662                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 663                 orphan_blk->entry_count = cpu_to_le32(nentries);
 664                 set_page_dirty(page);
 665                 f2fs_put_page(page, 1);
 666         }
 667 }
 668
 669 static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
 670                 struct f2fs_checkpoint **cp_block, struct page **cp_page,
 671                 unsigned long long *version)
 672 {
 673         unsigned long blk_size = sbi->blocksize;
 674         size_t crc_offset = 0;
 675         __u32 crc = 0;
 676
 677         *cp_page = get_meta_page(sbi, cp_addr);
 678         *cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
 679
 680         crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
 681         if (crc_offset > (blk_size - sizeof(__le32))) {
 682                 f2fs_msg(sbi->sb, KERN_WARNING,
 683                         "invalid crc_offset: %zu", crc_offset);
 684                 return -EINVAL;
 685         }
 686
 687         crc = cur_cp_crc(*cp_block);
 688         if (!f2fs_crc_valid(sbi, crc, *cp_block, crc_offset)) {
 689                 f2fs_msg(sbi->sb, KERN_WARNING, "invalid crc value");
 690                 return -EINVAL;
 691         }
 692
 693         *version = cur_cp_version(*cp_block);
 694         return 0;
 695 }
 696
 697 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 698                                 block_t cp_addr, unsigned long long *version)
 699 {
 700         struct page *cp_page_1 = NULL, *cp_page_2 = NULL;
 701         struct f2fs_checkpoint *cp_block = NULL;
 702         unsigned long long cur_version = 0, pre_version = 0;
 703         int err;
 704
 705         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 706                                         &cp_page_1, version);
 707         if (err)
 708                 goto invalid_cp1;
 709         pre_version = *version;
 710
 711         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 712         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 713                                         &cp_page_2, version);
 714         if (err)
 715                 goto invalid_cp2;
 716         cur_version = *version;
 717
 718         if (cur_version == pre_version) {
 719                 *version = cur_version;
 720                 f2fs_put_page(cp_page_2, 1);
 721                 return cp_page_1;
 722         }
 723 invalid_cp2:
 724         f2fs_put_page(cp_page_2, 1);
 725 invalid_cp1:
 726         f2fs_put_page(cp_page_1, 1);
 727         return NULL;
 728 }
 729
 730 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 731 {
 732         struct f2fs_checkpoint *cp_block;
 733         struct f2fs_super_block *fsb = sbi->raw_super;
 734         struct page *cp1, *cp2, *cur_page;
 735         unsigned long blk_size = sbi->blocksize;
 736         unsigned long long cp1_version = 0, cp2_version = 0;
 737         unsigned long long cp_start_blk_no;
 738         unsigned int cp_blks = 1 + __cp_payload(sbi);
 739         block_t cp_blk_no;
 740         int i;
 741
 742         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 743         if (!sbi->ckpt)
 744                 return -ENOMEM;
 745         /*
 746          * Finding out valid cp block involves read both
 747          * sets( cp pack1 and cp pack 2)
 748          */
 749         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 750         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 751
 752         /* The second checkpoint pack should start at the next segment */
 753         cp_start_blk_no += ((unsigned long long)1) <<
 754                                 le32_to_cpu(fsb->log_blocks_per_seg);
 755         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 756
 757         if (cp1 && cp2) {
 758                 if (ver_after(cp2_version, cp1_version))
 759                         cur_page = cp2;
 760                 else
 761                         cur_page = cp1;
 762         } else if (cp1) {
 763                 cur_page = cp1;
 764         } else if (cp2) {
 765                 cur_page = cp2;
 766         } else {
 767                 goto fail_no_cp;
 768         }
 769
 770         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 771         memcpy(sbi->ckpt, cp_block, blk_size);
 772
 773         /* Sanity checking of checkpoint */
 774         if (sanity_check_ckpt(sbi))
 775                 goto free_fail_no_cp;
 776
 777         if (cur_page == cp1)
 778                 sbi->cur_cp_pack = 1;
 779         else
 780                 sbi->cur_cp_pack = 2;
 781
 782         if (cp_blks <= 1)
 783                 goto done;
 784
 785         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 786         if (cur_page == cp2)
 787                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 788
 789         for (i = 1; i < cp_blks; i++) {
 790                 void *sit_bitmap_ptr;
 791                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 792
 793                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 794                 sit_bitmap_ptr = page_address(cur_page);
 795                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 796                 f2fs_put_page(cur_page, 1);
 797         }
 798 done:
 799         f2fs_put_page(cp1, 1);
 800         f2fs_put_page(cp2, 1);
 801         return 0;
 802
 803 free_fail_no_cp:
 804         f2fs_put_page(cp1, 1);
 805         f2fs_put_page(cp2, 1);
 806 fail_no_cp:
 807         kfree(sbi->ckpt);
 808         return -EINVAL;
 809 }
 810
 811 static void __add_dirty_inode(struct inode *inode, enum inode_type type)
 812 {
 813         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 814         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 815
 816         if (is_inode_flag_set(inode, flag))
 817                 return;
 818
 819         set_inode_flag(inode, flag);
 820         if (!f2fs_is_volatile_file(inode))
 821                 list_add_tail(&F2FS_I(inode)->dirty_list,
 822                                                 &sbi->inode_list[type]);
 823         stat_inc_dirty_inode(sbi, type);
 824 }
 825
 826 static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
 827 {
 828         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 829
 830         if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
 831                 return;
 832
 833         list_del_init(&F2FS_I(inode)->dirty_list);
 834         clear_inode_flag(inode, flag);
 835         stat_dec_dirty_inode(F2FS_I_SB(inode), type);
 836 }
 837
 838 void update_dirty_page(struct inode *inode, struct page *page)
 839 {
 840         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 841         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 842
 843         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 844                         !S_ISLNK(inode->i_mode))
 845                 return;
 846
 847         spin_lock(&sbi->inode_lock[type]);
 848         if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
 849                 __add_dirty_inode(inode, type);
 850         inode_inc_dirty_pages(inode);
 851         spin_unlock(&sbi->inode_lock[type]);
 852
 853         SetPagePrivate(page);
 854         f2fs_trace_pid(page);
 855 }
 856
 857 void remove_dirty_inode(struct inode *inode)
 858 {
 859         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 860         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 861
 862         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 863                         !S_ISLNK(inode->i_mode))
 864                 return;
 865
 866         if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
 867                 return;
 868
 869         spin_lock(&sbi->inode_lock[type]);
 870         __remove_dirty_inode(inode, type);
 871         spin_unlock(&sbi->inode_lock[type]);
 872 }
 873
 874 int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
 875 {
 876         struct list_head *head;
 877         struct inode *inode;
 878         struct f2fs_inode_info *fi;
 879         bool is_dir = (type == DIR_INODE);
 880
 881         trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
 882                                 get_pages(sbi, is_dir ?
 883                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 884 retry:
 885         if (unlikely(f2fs_cp_error(sbi)))
 886                 return -EIO;
 887
 888         spin_lock(&sbi->inode_lock[type]);
 889
 890         head = &sbi->inode_list[type];
 891         if (list_empty(head)) {
 892                 spin_unlock(&sbi->inode_lock[type]);
 893                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
 894                                 get_pages(sbi, is_dir ?
 895                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 896                 return 0;
 897         }
 898         fi = list_first_entry(head, struct f2fs_inode_info, dirty_list);
 899         inode = igrab(&fi->vfs_inode);
 900         spin_unlock(&sbi->inode_lock[type]);
 901         if (inode) {
 902                 filemap_fdatawrite(inode->i_mapping);
 903                 iput(inode);
 904         } else {
 905                 /*
 906                  * We should submit bio, since it exists several
 907                  * wribacking dentry pages in the freeing inode.
 908                  */
 909                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 910                 cond_resched();
 911         }
 912         goto retry;
 913 }
 914
 915 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
 916 {
 917         struct list_head *head = &sbi->inode_list[DIRTY_META];
 918         struct inode *inode;
 919         struct f2fs_inode_info *fi;
 920         s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
 921
 922         while (total--) {
 923                 if (unlikely(f2fs_cp_error(sbi)))
 924                         return -EIO;
 925
 926                 spin_lock(&sbi->inode_lock[DIRTY_META]);
 927                 if (list_empty(head)) {
 928                         spin_unlock(&sbi->inode_lock[DIRTY_META]);
 929                         return 0;
 930                 }
 931                 fi = list_first_entry(head, struct f2fs_inode_info,
 932                                                         gdirty_list);
 933                 inode = igrab(&fi->vfs_inode);
 934                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
 935                 if (inode) {
 936                         sync_inode_metadata(inode, 0);
 937
 938                         /* it's on eviction */
 939                         if (is_inode_flag_set(inode, FI_DIRTY_INODE))
 940                                 update_inode_page(inode);
 941                         iput(inode);
 942                 }
 943         };
 944         return 0;
 945 }
 946
 947 static void __prepare_cp_block(struct f2fs_sb_info *sbi)
 948 {
 949         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 950         struct f2fs_nm_info *nm_i = NM_I(sbi);
 951         nid_t last_nid = nm_i->next_scan_nid;
 952
 953         next_free_nid(sbi, &last_nid);
 954         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
 955         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
 956         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
 957         ckpt->next_free_nid = cpu_to_le32(last_nid);
 958 }
 959
 960 /*
 961  * Freeze all the FS-operations for checkpoint.
 962  */
 963 static int block_operations(struct f2fs_sb_info *sbi)
 964 {
 965         struct writeback_control wbc = {
 966                 .sync_mode = WB_SYNC_ALL,
 967                 .nr_to_write = LONG_MAX,
 968                 .for_reclaim = 0,
 969         };
 970         struct blk_plug plug;
 971         int err = 0;
 972
 973         blk_start_plug(&plug);
 974
 975 retry_flush_dents:
 976         f2fs_lock_all(sbi);
 977         /* write all the dirty dentry pages */
 978         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 979                 f2fs_unlock_all(sbi);
 980                 err = sync_dirty_inodes(sbi, DIR_INODE);
 981                 if (err)
 982                         goto out;
 983                 cond_resched();
 984                 goto retry_flush_dents;
 985         }
 986
 987         /*
 988          * POR: we should ensure that there are no dirty node pages
 989          * until finishing nat/sit flush. inode->i_blocks can be updated.
 990          */
 991         down_write(&sbi->node_change);
 992
 993         if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
 994                 up_write(&sbi->node_change);
 995                 f2fs_unlock_all(sbi);
 996                 err = f2fs_sync_inode_meta(sbi);
 997                 if (err)
 998                         goto out;
 999                 cond_resched();
1000                 goto retry_flush_dents;
1001         }
1002
1003 retry_flush_nodes:
1004         down_write(&sbi->node_write);
1005
1006         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
1007                 up_write(&sbi->node_write);
1008                 err = sync_node_pages(sbi, &wbc);
1009                 if (err) {
1010                         up_write(&sbi->node_change);
1011                         f2fs_unlock_all(sbi);
1012                         goto out;
1013                 }
1014                 cond_resched();
1015                 goto retry_flush_nodes;
1016         }
1017
1018         /*
1019          * sbi->node_change is used only for AIO write_begin path which produces
1020          * dirty node blocks and some checkpoint values by block allocation.
1021          */
1022         __prepare_cp_block(sbi);
1023         up_write(&sbi->node_change);
1024 out:
1025         blk_finish_plug(&plug);
1026         return err;
1027 }
1028
1029 static void unblock_operations(struct f2fs_sb_info *sbi)
1030 {
1031         up_write(&sbi->node_write);
1032         f2fs_unlock_all(sbi);
1033 }
1034
1035 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
1036 {
1037         DEFINE_WAIT(wait);
1038
1039         for (;;) {
1040                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
1041
1042                 if (!get_pages(sbi, F2FS_WB_CP_DATA))
1043                         break;
1044
1045                 io_schedule_timeout(5*HZ);
1046         }
1047         finish_wait(&sbi->cp_wait, &wait);
1048 }
1049
1050 static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1051 {
1052         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
1053         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1054
1055         spin_lock(&sbi->cp_lock);
1056
1057         if ((cpc->reason & CP_UMOUNT) &&
1058                         le32_to_cpu(ckpt->cp_pack_total_block_count) >
1059                         sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks)
1060                 disable_nat_bits(sbi, false);
1061
1062         if (cpc->reason & CP_TRIMMED)
1063                 __set_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1064
1065         if (cpc->reason & CP_UMOUNT)
1066                 __set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1067         else
1068                 __clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1069
1070         if (cpc->reason & CP_FASTBOOT)
1071                 __set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1072         else
1073                 __clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1074
1075         if (orphan_num)
1076                 __set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1077         else
1078                 __clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1079
1080         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1081                 __set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1082
1083         /* set this flag to activate crc|cp_ver for recovery */
1084         __set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
1085
1086         spin_unlock(&sbi->cp_lock);
1087 }
1088
1089 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1090 {
1091         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1092         struct f2fs_nm_info *nm_i = NM_I(sbi);
1093         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
1094         block_t start_blk;
1095         unsigned int data_sum_blocks, orphan_blocks;
1096         __u32 crc32 = 0;
1097         int i;
1098         int cp_payload_blks = __cp_payload(sbi);
1099         struct super_block *sb = sbi->sb;
1100         struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
1101         u64 kbytes_written;
1102
1103         /* Flush all the NAT/SIT pages */
1104         while (get_pages(sbi, F2FS_DIRTY_META)) {
1105                 sync_meta_pages(sbi, META, LONG_MAX);
1106                 if (unlikely(f2fs_cp_error(sbi)))
1107                         return -EIO;
1108         }
1109
1110         /*
1111          * modify checkpoint
1112          * version number is already updated
1113          */
1114         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
1115         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
1116         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
1117                 ckpt->cur_node_segno[i] =
1118                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
1119                 ckpt->cur_node_blkoff[i] =
1120                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
1121                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
1122                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
1123         }
1124         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
1125                 ckpt->cur_data_segno[i] =
1126                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
1127                 ckpt->cur_data_blkoff[i] =
1128                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
1129                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
1130                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
1131         }
1132
1133         /* 2 cp  + n data seg summary + orphan inode blocks */
1134         data_sum_blocks = npages_for_summary_flush(sbi, false);
1135         spin_lock(&sbi->cp_lock);
1136         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
1137                 __set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1138         else
1139                 __clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1140         spin_unlock(&sbi->cp_lock);
1141
1142         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
1143         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
1144                         orphan_blocks);
1145
1146         if (__remain_node_summaries(cpc->reason))
1147                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
1148                                 cp_payload_blks + data_sum_blocks +
1149                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
1150         else
1151                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1152                                 cp_payload_blks + data_sum_blocks +
1153                                 orphan_blocks);
1154
1155         /* update ckpt flag for checkpoint */
1156         update_ckpt_flags(sbi, cpc);
1157
1158         /* update SIT/NAT bitmap */
1159         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1160         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1161
1162         crc32 = f2fs_crc32(sbi, ckpt, le32_to_cpu(ckpt->checksum_offset));
1163         *((__le32 *)((unsigned char *)ckpt +
1164                                 le32_to_cpu(ckpt->checksum_offset)))
1165                                 = cpu_to_le32(crc32);
1166
1167         start_blk = __start_cp_next_addr(sbi);
1168
1169         /* write nat bits */
1170         if (enabled_nat_bits(sbi, cpc)) {
1171                 __u64 cp_ver = cur_cp_version(ckpt);
1172                 block_t blk;
1173
1174                 cp_ver |= ((__u64)crc32 << 32);
1175                 *(__le64 *)nm_i->nat_bits = cpu_to_le64(cp_ver);
1176
1177                 blk = start_blk + sbi->blocks_per_seg - nm_i->nat_bits_blocks;
1178                 for (i = 0; i < nm_i->nat_bits_blocks; i++)
1179                         update_meta_page(sbi, nm_i->nat_bits +
1180                                         (i << F2FS_BLKSIZE_BITS), blk + i);
1181
1182                 /* Flush all the NAT BITS pages */
1183                 while (get_pages(sbi, F2FS_DIRTY_META)) {
1184                         sync_meta_pages(sbi, META, LONG_MAX);
1185                         if (unlikely(f2fs_cp_error(sbi)))
1186                                 return -EIO;
1187                 }
1188         }
1189
1190         /* need to wait for end_io results */
1191         wait_on_all_pages_writeback(sbi);
1192         if (unlikely(f2fs_cp_error(sbi)))
1193                 return -EIO;
1194
1195         /* write out checkpoint buffer at block 0 */
1196         update_meta_page(sbi, ckpt, start_blk++);
1197
1198         for (i = 1; i < 1 + cp_payload_blks; i++)
1199                 update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1200                                                         start_blk++);
1201
1202         if (orphan_num) {
1203                 write_orphan_inodes(sbi, start_blk);
1204                 start_blk += orphan_blocks;
1205         }
1206
1207         write_data_summaries(sbi, start_blk);
1208         start_blk += data_sum_blocks;
1209
1210         /* Record write statistics in the hot node summary */
1211         kbytes_written = sbi->kbytes_written;
1212         if (sb->s_bdev->bd_part)
1213                 kbytes_written += BD_PART_WRITTEN(sbi);
1214
1215         seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
1216
1217         if (__remain_node_summaries(cpc->reason)) {
1218                 write_node_summaries(sbi, start_blk);
1219                 start_blk += NR_CURSEG_NODE_TYPE;
1220         }
1221
1222         /* writeout checkpoint block */
1223         update_meta_page(sbi, ckpt, start_blk);
1224
1225         /* wait for previous submitted node/meta pages writeback */
1226         wait_on_all_pages_writeback(sbi);
1227
1228         if (unlikely(f2fs_cp_error(sbi)))
1229                 return -EIO;
1230
1231         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LLONG_MAX);
1232         filemap_fdatawait_range(META_MAPPING(sbi), 0, LLONG_MAX);
1233
1234         /* update user_block_counts */
1235         sbi->last_valid_block_count = sbi->total_valid_block_count;
1236         percpu_counter_set(&sbi->alloc_valid_block_count, 0);
1237
1238         /* Here, we only have one bio having CP pack */
1239         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
1240
1241         /* wait for previous submitted meta pages writeback */
1242         wait_on_all_pages_writeback(sbi);
1243
1244         release_ino_entry(sbi, false);
1245
1246         if (unlikely(f2fs_cp_error(sbi)))
1247                 return -EIO;
1248
1249         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1250         clear_sbi_flag(sbi, SBI_NEED_CP);
1251         __set_cp_next_pack(sbi);
1252
1253         /*
1254          * redirty superblock if metadata like node page or inode cache is
1255          * updated during writing checkpoint.
1256          */
1257         if (get_pages(sbi, F2FS_DIRTY_NODES) ||
1258                         get_pages(sbi, F2FS_DIRTY_IMETA))
1259                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1260
1261         f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS));
1262
1263         return 0;
1264 }
1265
1266 /*
1267  * We guarantee that this checkpoint procedure will not fail.
1268  */
1269 int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1270 {
1271         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1272         unsigned long long ckpt_ver;
1273         int err = 0;
1274
1275         mutex_lock(&sbi->cp_mutex);
1276
1277         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1278                 ((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) ||
1279                 ((cpc->reason & CP_DISCARD) && !sbi->discard_blks)))
1280                 goto out;
1281         if (unlikely(f2fs_cp_error(sbi))) {
1282                 err = -EIO;
1283                 goto out;
1284         }
1285         if (f2fs_readonly(sbi->sb)) {
1286                 err = -EROFS;
1287                 goto out;
1288         }
1289
1290         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1291
1292         err = block_operations(sbi);
1293         if (err)
1294                 goto out;
1295
1296         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1297
1298         f2fs_flush_merged_bios(sbi);
1299
1300         /* this is the case of multiple fstrims without any changes */
1301         if (cpc->reason & CP_DISCARD) {
1302                 if (!exist_trim_candidates(sbi, cpc)) {
1303                         unblock_operations(sbi);
1304                         goto out;
1305                 }
1306
1307                 if (NM_I(sbi)->dirty_nat_cnt == 0 &&
1308                                 SIT_I(sbi)->dirty_sentries == 0 &&
1309                                 prefree_segments(sbi) == 0) {
1310                         flush_sit_entries(sbi, cpc);
1311                         clear_prefree_segments(sbi, cpc);
1312                         unblock_operations(sbi);
1313                         goto out;
1314                 }
1315         }
1316
1317         /*
1318          * update checkpoint pack index
1319          * Increase the version number so that
1320          * SIT entries and seg summaries are written at correct place
1321          */
1322         ckpt_ver = cur_cp_version(ckpt);
1323         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1324
1325         /* write cached NAT/SIT entries to NAT/SIT area */
1326         flush_nat_entries(sbi, cpc);
1327         flush_sit_entries(sbi, cpc);
1328
1329         /* unlock all the fs_lock[] in do_checkpoint() */
1330         err = do_checkpoint(sbi, cpc);
1331         if (err)
1332                 release_discard_addrs(sbi);
1333         else
1334                 clear_prefree_segments(sbi, cpc);
1335
1336         unblock_operations(sbi);
1337         stat_inc_cp_count(sbi->stat_info);
1338
1339         if (cpc->reason & CP_RECOVERY)
1340                 f2fs_msg(sbi->sb, KERN_NOTICE,
1341                         "checkpoint: version = %llx", ckpt_ver);
1342
1343         /* do checkpoint periodically */
1344         f2fs_update_time(sbi, CP_TIME);
1345         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1346 out:
1347         mutex_unlock(&sbi->cp_mutex);
1348         return err;
1349 }
1350
1351 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1352 {
1353         int i;
1354
1355         for (i = 0; i < MAX_INO_ENTRY; i++) {
1356                 struct inode_management *im = &sbi->im[i];
1357
1358                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1359                 spin_lock_init(&im->ino_lock);
1360                 INIT_LIST_HEAD(&im->ino_list);
1361                 im->ino_num = 0;
1362         }
1363
1364         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1365                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1366                                 F2FS_ORPHANS_PER_BLOCK;
1367 }
1368
1369 int __init create_checkpoint_caches(void)
1370 {
1371         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1372                         sizeof(struct ino_entry));
1373         if (!ino_entry_slab)
1374                 return -ENOMEM;
1375         inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1376                         sizeof(struct inode_entry));
1377         if (!inode_entry_slab) {
1378                 kmem_cache_destroy(ino_entry_slab);
1379                 return -ENOMEM;
1380         }
1381         return 0;
1382 }
1383
1384 void destroy_checkpoint_caches(void)
1385 {
1386         kmem_cache_destroy(ino_entry_slab);
1387         kmem_cache_destroy(inode_entry_slab);
1388 }