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 /*
  30  * We guarantee no failure on the returned page.
  31  */
  32 struct page *grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  33 {
  34         struct address_space *mapping = META_MAPPING(sbi);
  35         struct page *page = NULL;
  36 repeat:
  37         page = grab_cache_page(mapping, index);
  38         if (!page) {
  39                 cond_resched();
  40                 goto repeat;
  41         }
  42         f2fs_wait_on_page_writeback(page, META);
  43         SetPageUptodate(page);
  44         return page;
  45 }
  46
  47 /*
  48  * We guarantee no failure on the returned page.
  49  */
  50 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  51 {
  52         struct address_space *mapping = META_MAPPING(sbi);
  53         struct page *page;
  54         struct f2fs_io_info fio = {
  55                 .sbi = sbi,
  56                 .type = META,
  57                 .rw = READ_SYNC | REQ_META | REQ_PRIO,
  58                 .blk_addr = index,
  59                 .encrypted_page = NULL,
  60         };
  61 repeat:
  62         page = grab_cache_page(mapping, index);
  63         if (!page) {
  64                 cond_resched();
  65                 goto repeat;
  66         }
  67         if (PageUptodate(page))
  68                 goto out;
  69
  70         fio.page = page;
  71
  72         if (f2fs_submit_page_bio(&fio)) {
  73                 f2fs_put_page(page, 1);
  74                 goto repeat;
  75         }
  76
  77         lock_page(page);
  78         if (unlikely(page->mapping != mapping)) {
  79                 f2fs_put_page(page, 1);
  80                 goto repeat;
  81         }
  82
  83         /*
  84          * if there is any IO error when accessing device, make our filesystem
  85          * readonly and make sure do not write checkpoint with non-uptodate
  86          * meta page.
  87          */
  88         if (unlikely(!PageUptodate(page)))
  89                 f2fs_stop_checkpoint(sbi);
  90 out:
  91         return page;
  92 }
  93
  94 bool is_valid_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type)
  95 {
  96         switch (type) {
  97         case META_NAT:
  98                 break;
  99         case META_SIT:
 100                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 101                         return false;
 102                 break;
 103         case META_SSA:
 104                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 105                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 106                         return false;
 107                 break;
 108         case META_CP:
 109                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 110                         blkaddr < __start_cp_addr(sbi)))
 111                         return false;
 112                 break;
 113         case META_POR:
 114                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 115                         blkaddr < MAIN_BLKADDR(sbi)))
 116                         return false;
 117                 break;
 118         default:
 119                 BUG();
 120         }
 121
 122         return true;
 123 }
 124
 125 /*
 126  * Readahead CP/NAT/SIT/SSA pages
 127  */
 128 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, int type)
 129 {
 130         block_t prev_blk_addr = 0;
 131         struct page *page;
 132         block_t blkno = start;
 133         struct f2fs_io_info fio = {
 134                 .sbi = sbi,
 135                 .type = META,
 136                 .rw = READ_SYNC | REQ_META | REQ_PRIO,
 137                 .encrypted_page = NULL,
 138         };
 139
 140         for (; nrpages-- > 0; blkno++) {
 141
 142                 if (!is_valid_blkaddr(sbi, blkno, type))
 143                         goto out;
 144
 145                 switch (type) {
 146                 case META_NAT:
 147                         if (unlikely(blkno >=
 148                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 149                                 blkno = 0;
 150                         /* get nat block addr */
 151                         fio.blk_addr = current_nat_addr(sbi,
 152                                         blkno * NAT_ENTRY_PER_BLOCK);
 153                         break;
 154                 case META_SIT:
 155                         /* get sit block addr */
 156                         fio.blk_addr = current_sit_addr(sbi,
 157                                         blkno * SIT_ENTRY_PER_BLOCK);
 158                         if (blkno != start && prev_blk_addr + 1 != fio.blk_addr)
 159                                 goto out;
 160                         prev_blk_addr = fio.blk_addr;
 161                         break;
 162                 case META_SSA:
 163                 case META_CP:
 164                 case META_POR:
 165                         fio.blk_addr = blkno;
 166                         break;
 167                 default:
 168                         BUG();
 169                 }
 170
 171                 page = grab_cache_page(META_MAPPING(sbi), fio.blk_addr);
 172                 if (!page)
 173                         continue;
 174                 if (PageUptodate(page)) {
 175                         f2fs_put_page(page, 1);
 176                         continue;
 177                 }
 178
 179                 fio.page = page;
 180                 f2fs_submit_page_mbio(&fio);
 181                 f2fs_put_page(page, 0);
 182         }
 183 out:
 184         f2fs_submit_merged_bio(sbi, META, READ);
 185         return blkno - start;
 186 }
 187
 188 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 189 {
 190         struct page *page;
 191         bool readahead = false;
 192
 193         page = find_get_page(META_MAPPING(sbi), index);
 194         if (!page || (page && !PageUptodate(page)))
 195                 readahead = true;
 196         f2fs_put_page(page, 0);
 197
 198         if (readahead)
 199                 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR);
 200 }
 201
 202 static int f2fs_write_meta_page(struct page *page,
 203                                 struct writeback_control *wbc)
 204 {
 205         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 206
 207         trace_f2fs_writepage(page, META);
 208
 209         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 210                 goto redirty_out;
 211         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 212                 goto redirty_out;
 213         if (unlikely(f2fs_cp_error(sbi)))
 214                 goto redirty_out;
 215
 216         f2fs_wait_on_page_writeback(page, META);
 217         write_meta_page(sbi, page);
 218         dec_page_count(sbi, F2FS_DIRTY_META);
 219         unlock_page(page);
 220
 221         if (wbc->for_reclaim)
 222                 f2fs_submit_merged_bio(sbi, META, WRITE);
 223         return 0;
 224
 225 redirty_out:
 226         redirty_page_for_writepage(wbc, page);
 227         return AOP_WRITEPAGE_ACTIVATE;
 228 }
 229
 230 static int f2fs_write_meta_pages(struct address_space *mapping,
 231                                 struct writeback_control *wbc)
 232 {
 233         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 234         long diff, written;
 235
 236         trace_f2fs_writepages(mapping->host, wbc, META);
 237
 238         /* collect a number of dirty meta pages and write together */
 239         if (wbc->for_kupdate ||
 240                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 241                 goto skip_write;
 242
 243         /* if mounting is failed, skip writing node pages */
 244         mutex_lock(&sbi->cp_mutex);
 245         diff = nr_pages_to_write(sbi, META, wbc);
 246         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 247         mutex_unlock(&sbi->cp_mutex);
 248         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 249         return 0;
 250
 251 skip_write:
 252         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 253         return 0;
 254 }
 255
 256 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 257                                                 long nr_to_write)
 258 {
 259         struct address_space *mapping = META_MAPPING(sbi);
 260         pgoff_t index = 0, end = LONG_MAX;
 261         struct pagevec pvec;
 262         long nwritten = 0;
 263         struct writeback_control wbc = {
 264                 .for_reclaim = 0,
 265         };
 266
 267         pagevec_init(&pvec, 0);
 268
 269         while (index <= end) {
 270                 int i, nr_pages;
 271                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 272                                 PAGECACHE_TAG_DIRTY,
 273                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 274                 if (unlikely(nr_pages == 0))
 275                         break;
 276
 277                 for (i = 0; i < nr_pages; i++) {
 278                         struct page *page = pvec.pages[i];
 279
 280                         lock_page(page);
 281
 282                         if (unlikely(page->mapping != mapping)) {
 283 continue_unlock:
 284                                 unlock_page(page);
 285                                 continue;
 286                         }
 287                         if (!PageDirty(page)) {
 288                                 /* someone wrote it for us */
 289                                 goto continue_unlock;
 290                         }
 291
 292                         if (!clear_page_dirty_for_io(page))
 293                                 goto continue_unlock;
 294
 295                         if (mapping->a_ops->writepage(page, &wbc)) {
 296                                 unlock_page(page);
 297                                 break;
 298                         }
 299                         nwritten++;
 300                         if (unlikely(nwritten >= nr_to_write))
 301                                 break;
 302                 }
 303                 pagevec_release(&pvec);
 304                 cond_resched();
 305         }
 306
 307         if (nwritten)
 308                 f2fs_submit_merged_bio(sbi, type, WRITE);
 309
 310         return nwritten;
 311 }
 312
 313 static int f2fs_set_meta_page_dirty(struct page *page)
 314 {
 315         trace_f2fs_set_page_dirty(page, META);
 316
 317         SetPageUptodate(page);
 318         if (!PageDirty(page)) {
 319                 __set_page_dirty_nobuffers(page);
 320                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 321                 SetPagePrivate(page);
 322                 f2fs_trace_pid(page);
 323                 return 1;
 324         }
 325         return 0;
 326 }
 327
 328 const struct address_space_operations f2fs_meta_aops = {
 329         .writepage      = f2fs_write_meta_page,
 330         .writepages     = f2fs_write_meta_pages,
 331         .set_page_dirty = f2fs_set_meta_page_dirty,
 332         .invalidatepage = f2fs_invalidate_page,
 333         .releasepage    = f2fs_release_page,
 334 };
 335
 336 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 337 {
 338         struct inode_management *im = &sbi->im[type];
 339         struct ino_entry *e;
 340 retry:
 341         if (radix_tree_preload(GFP_NOFS)) {
 342                 cond_resched();
 343                 goto retry;
 344         }
 345
 346         spin_lock(&im->ino_lock);
 347
 348         e = radix_tree_lookup(&im->ino_root, ino);
 349         if (!e) {
 350                 e = kmem_cache_alloc(ino_entry_slab, GFP_ATOMIC);
 351                 if (!e) {
 352                         spin_unlock(&im->ino_lock);
 353                         radix_tree_preload_end();
 354                         goto retry;
 355                 }
 356                 if (radix_tree_insert(&im->ino_root, ino, e)) {
 357                         spin_unlock(&im->ino_lock);
 358                         kmem_cache_free(ino_entry_slab, e);
 359                         radix_tree_preload_end();
 360                         goto retry;
 361                 }
 362                 memset(e, 0, sizeof(struct ino_entry));
 363                 e->ino = ino;
 364
 365                 list_add_tail(&e->list, &im->ino_list);
 366                 if (type != ORPHAN_INO)
 367                         im->ino_num++;
 368         }
 369         spin_unlock(&im->ino_lock);
 370         radix_tree_preload_end();
 371 }
 372
 373 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 374 {
 375         struct inode_management *im = &sbi->im[type];
 376         struct ino_entry *e;
 377
 378         spin_lock(&im->ino_lock);
 379         e = radix_tree_lookup(&im->ino_root, ino);
 380         if (e) {
 381                 list_del(&e->list);
 382                 radix_tree_delete(&im->ino_root, ino);
 383                 im->ino_num--;
 384                 spin_unlock(&im->ino_lock);
 385                 kmem_cache_free(ino_entry_slab, e);
 386                 return;
 387         }
 388         spin_unlock(&im->ino_lock);
 389 }
 390
 391 void add_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 392 {
 393         /* add new dirty ino entry into list */
 394         __add_ino_entry(sbi, ino, type);
 395 }
 396
 397 void remove_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 398 {
 399         /* remove dirty ino entry from list */
 400         __remove_ino_entry(sbi, ino, type);
 401 }
 402
 403 /* mode should be APPEND_INO or UPDATE_INO */
 404 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 405 {
 406         struct inode_management *im = &sbi->im[mode];
 407         struct ino_entry *e;
 408
 409         spin_lock(&im->ino_lock);
 410         e = radix_tree_lookup(&im->ino_root, ino);
 411         spin_unlock(&im->ino_lock);
 412         return e ? true : false;
 413 }
 414
 415 void release_dirty_inode(struct f2fs_sb_info *sbi)
 416 {
 417         struct ino_entry *e, *tmp;
 418         int i;
 419
 420         for (i = APPEND_INO; i <= UPDATE_INO; i++) {
 421                 struct inode_management *im = &sbi->im[i];
 422
 423                 spin_lock(&im->ino_lock);
 424                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 425                         list_del(&e->list);
 426                         radix_tree_delete(&im->ino_root, e->ino);
 427                         kmem_cache_free(ino_entry_slab, e);
 428                         im->ino_num--;
 429                 }
 430                 spin_unlock(&im->ino_lock);
 431         }
 432 }
 433
 434 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 435 {
 436         struct inode_management *im = &sbi->im[ORPHAN_INO];
 437         int err = 0;
 438
 439         spin_lock(&im->ino_lock);
 440         if (unlikely(im->ino_num >= sbi->max_orphans))
 441                 err = -ENOSPC;
 442         else
 443                 im->ino_num++;
 444         spin_unlock(&im->ino_lock);
 445
 446         return err;
 447 }
 448
 449 void release_orphan_inode(struct f2fs_sb_info *sbi)
 450 {
 451         struct inode_management *im = &sbi->im[ORPHAN_INO];
 452
 453         spin_lock(&im->ino_lock);
 454         f2fs_bug_on(sbi, im->ino_num == 0);
 455         im->ino_num--;
 456         spin_unlock(&im->ino_lock);
 457 }
 458
 459 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 460 {
 461         /* add new orphan ino entry into list */
 462         __add_ino_entry(sbi, ino, ORPHAN_INO);
 463 }
 464
 465 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 466 {
 467         /* remove orphan entry from orphan list */
 468         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 469 }
 470
 471 static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 472 {
 473         struct inode *inode = f2fs_iget(sbi->sb, ino);
 474         f2fs_bug_on(sbi, IS_ERR(inode));
 475         clear_nlink(inode);
 476
 477         /* truncate all the data during iput */
 478         iput(inode);
 479 }
 480
 481 void recover_orphan_inodes(struct f2fs_sb_info *sbi)
 482 {
 483         block_t start_blk, orphan_blocks, i, j;
 484
 485         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
 486                 return;
 487
 488         set_sbi_flag(sbi, SBI_POR_DOING);
 489
 490         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 491         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 492
 493         ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP);
 494
 495         for (i = 0; i < orphan_blocks; i++) {
 496                 struct page *page = get_meta_page(sbi, start_blk + i);
 497                 struct f2fs_orphan_block *orphan_blk;
 498
 499                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 500                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 501                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 502                         recover_orphan_inode(sbi, ino);
 503                 }
 504                 f2fs_put_page(page, 1);
 505         }
 506         /* clear Orphan Flag */
 507         clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
 508         clear_sbi_flag(sbi, SBI_POR_DOING);
 509         return;
 510 }
 511
 512 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 513 {
 514         struct list_head *head;
 515         struct f2fs_orphan_block *orphan_blk = NULL;
 516         unsigned int nentries = 0;
 517         unsigned short index = 1;
 518         unsigned short orphan_blocks;
 519         struct page *page = NULL;
 520         struct ino_entry *orphan = NULL;
 521         struct inode_management *im = &sbi->im[ORPHAN_INO];
 522
 523         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 524
 525         /*
 526          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 527          * orphan inode operations are covered under f2fs_lock_op().
 528          * And, spin_lock should be avoided due to page operations below.
 529          */
 530         head = &im->ino_list;
 531
 532         /* loop for each orphan inode entry and write them in Jornal block */
 533         list_for_each_entry(orphan, head, list) {
 534                 if (!page) {
 535                         page = grab_meta_page(sbi, start_blk++);
 536                         orphan_blk =
 537                                 (struct f2fs_orphan_block *)page_address(page);
 538                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 539                 }
 540
 541                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 542
 543                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 544                         /*
 545                          * an orphan block is full of 1020 entries,
 546                          * then we need to flush current orphan blocks
 547                          * and bring another one in memory
 548                          */
 549                         orphan_blk->blk_addr = cpu_to_le16(index);
 550                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 551                         orphan_blk->entry_count = cpu_to_le32(nentries);
 552                         set_page_dirty(page);
 553                         f2fs_put_page(page, 1);
 554                         index++;
 555                         nentries = 0;
 556                         page = NULL;
 557                 }
 558         }
 559
 560         if (page) {
 561                 orphan_blk->blk_addr = cpu_to_le16(index);
 562                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 563                 orphan_blk->entry_count = cpu_to_le32(nentries);
 564                 set_page_dirty(page);
 565                 f2fs_put_page(page, 1);
 566         }
 567 }
 568
 569 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 570                                 block_t cp_addr, unsigned long long *version)
 571 {
 572         struct page *cp_page_1, *cp_page_2 = NULL;
 573         unsigned long blk_size = sbi->blocksize;
 574         struct f2fs_checkpoint *cp_block;
 575         unsigned long long cur_version = 0, pre_version = 0;
 576         size_t crc_offset;
 577         __u32 crc = 0;
 578
 579         /* Read the 1st cp block in this CP pack */
 580         cp_page_1 = get_meta_page(sbi, cp_addr);
 581
 582         /* get the version number */
 583         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
 584         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 585         if (crc_offset >= blk_size)
 586                 goto invalid_cp1;
 587
 588         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 589         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 590                 goto invalid_cp1;
 591
 592         pre_version = cur_cp_version(cp_block);
 593
 594         /* Read the 2nd cp block in this CP pack */
 595         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 596         cp_page_2 = get_meta_page(sbi, cp_addr);
 597
 598         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
 599         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 600         if (crc_offset >= blk_size)
 601                 goto invalid_cp2;
 602
 603         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 604         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 605                 goto invalid_cp2;
 606
 607         cur_version = cur_cp_version(cp_block);
 608
 609         if (cur_version == pre_version) {
 610                 *version = cur_version;
 611                 f2fs_put_page(cp_page_2, 1);
 612                 return cp_page_1;
 613         }
 614 invalid_cp2:
 615         f2fs_put_page(cp_page_2, 1);
 616 invalid_cp1:
 617         f2fs_put_page(cp_page_1, 1);
 618         return NULL;
 619 }
 620
 621 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 622 {
 623         struct f2fs_checkpoint *cp_block;
 624         struct f2fs_super_block *fsb = sbi->raw_super;
 625         struct page *cp1, *cp2, *cur_page;
 626         unsigned long blk_size = sbi->blocksize;
 627         unsigned long long cp1_version = 0, cp2_version = 0;
 628         unsigned long long cp_start_blk_no;
 629         unsigned int cp_blks = 1 + __cp_payload(sbi);
 630         block_t cp_blk_no;
 631         int i;
 632
 633         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 634         if (!sbi->ckpt)
 635                 return -ENOMEM;
 636         /*
 637          * Finding out valid cp block involves read both
 638          * sets( cp pack1 and cp pack 2)
 639          */
 640         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 641         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 642
 643         /* The second checkpoint pack should start at the next segment */
 644         cp_start_blk_no += ((unsigned long long)1) <<
 645                                 le32_to_cpu(fsb->log_blocks_per_seg);
 646         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 647
 648         if (cp1 && cp2) {
 649                 if (ver_after(cp2_version, cp1_version))
 650                         cur_page = cp2;
 651                 else
 652                         cur_page = cp1;
 653         } else if (cp1) {
 654                 cur_page = cp1;
 655         } else if (cp2) {
 656                 cur_page = cp2;
 657         } else {
 658                 goto fail_no_cp;
 659         }
 660
 661         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 662         memcpy(sbi->ckpt, cp_block, blk_size);
 663
 664         if (cp_blks <= 1)
 665                 goto done;
 666
 667         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 668         if (cur_page == cp2)
 669                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 670
 671         for (i = 1; i < cp_blks; i++) {
 672                 void *sit_bitmap_ptr;
 673                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 674
 675                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 676                 sit_bitmap_ptr = page_address(cur_page);
 677                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 678                 f2fs_put_page(cur_page, 1);
 679         }
 680 done:
 681         f2fs_put_page(cp1, 1);
 682         f2fs_put_page(cp2, 1);
 683         return 0;
 684
 685 fail_no_cp:
 686         kfree(sbi->ckpt);
 687         return -EINVAL;
 688 }
 689
 690 static int __add_dirty_inode(struct inode *inode, struct inode_entry *new)
 691 {
 692         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 693
 694         if (is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR))
 695                 return -EEXIST;
 696
 697         set_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 698         F2FS_I(inode)->dirty_dir = new;
 699         list_add_tail(&new->list, &sbi->dir_inode_list);
 700         stat_inc_dirty_dir(sbi);
 701         return 0;
 702 }
 703
 704 void update_dirty_page(struct inode *inode, struct page *page)
 705 {
 706         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 707         struct inode_entry *new;
 708         int ret = 0;
 709
 710         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 711                         !S_ISLNK(inode->i_mode))
 712                 return;
 713
 714         if (!S_ISDIR(inode->i_mode)) {
 715                 inode_inc_dirty_pages(inode);
 716                 goto out;
 717         }
 718
 719         new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 720         new->inode = inode;
 721         INIT_LIST_HEAD(&new->list);
 722
 723         spin_lock(&sbi->dir_inode_lock);
 724         ret = __add_dirty_inode(inode, new);
 725         inode_inc_dirty_pages(inode);
 726         spin_unlock(&sbi->dir_inode_lock);
 727
 728         if (ret)
 729                 kmem_cache_free(inode_entry_slab, new);
 730 out:
 731         SetPagePrivate(page);
 732         f2fs_trace_pid(page);
 733 }
 734
 735 void add_dirty_dir_inode(struct inode *inode)
 736 {
 737         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 738         struct inode_entry *new =
 739                         f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 740         int ret = 0;
 741
 742         new->inode = inode;
 743         INIT_LIST_HEAD(&new->list);
 744
 745         spin_lock(&sbi->dir_inode_lock);
 746         ret = __add_dirty_inode(inode, new);
 747         spin_unlock(&sbi->dir_inode_lock);
 748
 749         if (ret)
 750                 kmem_cache_free(inode_entry_slab, new);
 751 }
 752
 753 void remove_dirty_dir_inode(struct inode *inode)
 754 {
 755         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 756         struct inode_entry *entry;
 757
 758         if (!S_ISDIR(inode->i_mode))
 759                 return;
 760
 761         spin_lock(&sbi->dir_inode_lock);
 762         if (get_dirty_pages(inode) ||
 763                         !is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR)) {
 764                 spin_unlock(&sbi->dir_inode_lock);
 765                 return;
 766         }
 767
 768         entry = F2FS_I(inode)->dirty_dir;
 769         list_del(&entry->list);
 770         F2FS_I(inode)->dirty_dir = NULL;
 771         clear_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 772         stat_dec_dirty_dir(sbi);
 773         spin_unlock(&sbi->dir_inode_lock);
 774         kmem_cache_free(inode_entry_slab, entry);
 775
 776         /* Only from the recovery routine */
 777         if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) {
 778                 clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT);
 779                 iput(inode);
 780         }
 781 }
 782
 783 void sync_dirty_dir_inodes(struct f2fs_sb_info *sbi)
 784 {
 785         struct list_head *head;
 786         struct inode_entry *entry;
 787         struct inode *inode;
 788 retry:
 789         if (unlikely(f2fs_cp_error(sbi)))
 790                 return;
 791
 792         spin_lock(&sbi->dir_inode_lock);
 793
 794         head = &sbi->dir_inode_list;
 795         if (list_empty(head)) {
 796                 spin_unlock(&sbi->dir_inode_lock);
 797                 return;
 798         }
 799         entry = list_entry(head->next, struct inode_entry, list);
 800         inode = igrab(entry->inode);
 801         spin_unlock(&sbi->dir_inode_lock);
 802         if (inode) {
 803                 filemap_fdatawrite(inode->i_mapping);
 804                 iput(inode);
 805         } else {
 806                 /*
 807                  * We should submit bio, since it exists several
 808                  * wribacking dentry pages in the freeing inode.
 809                  */
 810                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 811                 cond_resched();
 812         }
 813         goto retry;
 814 }
 815
 816 /*
 817  * Freeze all the FS-operations for checkpoint.
 818  */
 819 static int block_operations(struct f2fs_sb_info *sbi)
 820 {
 821         struct writeback_control wbc = {
 822                 .sync_mode = WB_SYNC_ALL,
 823                 .nr_to_write = LONG_MAX,
 824                 .for_reclaim = 0,
 825         };
 826         struct blk_plug plug;
 827         int err = 0;
 828
 829         blk_start_plug(&plug);
 830
 831 retry_flush_dents:
 832         f2fs_lock_all(sbi);
 833         /* write all the dirty dentry pages */
 834         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 835                 f2fs_unlock_all(sbi);
 836                 sync_dirty_dir_inodes(sbi);
 837                 if (unlikely(f2fs_cp_error(sbi))) {
 838                         err = -EIO;
 839                         goto out;
 840                 }
 841                 goto retry_flush_dents;
 842         }
 843
 844         /*
 845          * POR: we should ensure that there are no dirty node pages
 846          * until finishing nat/sit flush.
 847          */
 848 retry_flush_nodes:
 849         down_write(&sbi->node_write);
 850
 851         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
 852                 up_write(&sbi->node_write);
 853                 sync_node_pages(sbi, 0, &wbc);
 854                 if (unlikely(f2fs_cp_error(sbi))) {
 855                         f2fs_unlock_all(sbi);
 856                         err = -EIO;
 857                         goto out;
 858                 }
 859                 goto retry_flush_nodes;
 860         }
 861 out:
 862         blk_finish_plug(&plug);
 863         return err;
 864 }
 865
 866 static void unblock_operations(struct f2fs_sb_info *sbi)
 867 {
 868         up_write(&sbi->node_write);
 869         f2fs_unlock_all(sbi);
 870 }
 871
 872 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
 873 {
 874         DEFINE_WAIT(wait);
 875
 876         for (;;) {
 877                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
 878
 879                 if (!get_pages(sbi, F2FS_WRITEBACK))
 880                         break;
 881
 882                 io_schedule();
 883         }
 884         finish_wait(&sbi->cp_wait, &wait);
 885 }
 886
 887 static void do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 888 {
 889         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 890         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 891         struct f2fs_nm_info *nm_i = NM_I(sbi);
 892         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
 893         nid_t last_nid = nm_i->next_scan_nid;
 894         block_t start_blk;
 895         unsigned int data_sum_blocks, orphan_blocks;
 896         __u32 crc32 = 0;
 897         int i;
 898         int cp_payload_blks = __cp_payload(sbi);
 899         block_t discard_blk = NEXT_FREE_BLKADDR(sbi, curseg);
 900         bool invalidate = false;
 901
 902         /*
 903          * This avoids to conduct wrong roll-forward operations and uses
 904          * metapages, so should be called prior to sync_meta_pages below.
 905          */
 906         if (discard_next_dnode(sbi, discard_blk))
 907                 invalidate = true;
 908
 909         /* Flush all the NAT/SIT pages */
 910         while (get_pages(sbi, F2FS_DIRTY_META)) {
 911                 sync_meta_pages(sbi, META, LONG_MAX);
 912                 if (unlikely(f2fs_cp_error(sbi)))
 913                         return;
 914         }
 915
 916         next_free_nid(sbi, &last_nid);
 917
 918         /*
 919          * modify checkpoint
 920          * version number is already updated
 921          */
 922         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
 923         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
 924         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
 925         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
 926                 ckpt->cur_node_segno[i] =
 927                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
 928                 ckpt->cur_node_blkoff[i] =
 929                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
 930                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
 931                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
 932         }
 933         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
 934                 ckpt->cur_data_segno[i] =
 935                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
 936                 ckpt->cur_data_blkoff[i] =
 937                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
 938                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
 939                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
 940         }
 941
 942         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
 943         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
 944         ckpt->next_free_nid = cpu_to_le32(last_nid);
 945
 946         /* 2 cp  + n data seg summary + orphan inode blocks */
 947         data_sum_blocks = npages_for_summary_flush(sbi, false);
 948         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
 949                 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 950         else
 951                 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 952
 953         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
 954         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
 955                         orphan_blocks);
 956
 957         if (__remain_node_summaries(cpc->reason))
 958                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
 959                                 cp_payload_blks + data_sum_blocks +
 960                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
 961         else
 962                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
 963                                 cp_payload_blks + data_sum_blocks +
 964                                 orphan_blocks);
 965
 966         if (cpc->reason == CP_UMOUNT)
 967                 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 968         else
 969                 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 970
 971         if (cpc->reason == CP_FASTBOOT)
 972                 set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
 973         else
 974                 clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
 975
 976         if (orphan_num)
 977                 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 978         else
 979                 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 980
 981         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
 982                 set_ckpt_flags(ckpt, CP_FSCK_FLAG);
 983
 984         /* update SIT/NAT bitmap */
 985         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
 986         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
 987
 988         crc32 = f2fs_crc32(ckpt, le32_to_cpu(ckpt->checksum_offset));
 989         *((__le32 *)((unsigned char *)ckpt +
 990                                 le32_to_cpu(ckpt->checksum_offset)))
 991                                 = cpu_to_le32(crc32);
 992
 993         start_blk = __start_cp_addr(sbi);
 994
 995         /* write out checkpoint buffer at block 0 */
 996         update_meta_page(sbi, ckpt, start_blk++);
 997
 998         for (i = 1; i < 1 + cp_payload_blks; i++)
 999                 update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1000                                                         start_blk++);
1001
1002         if (orphan_num) {
1003                 write_orphan_inodes(sbi, start_blk);
1004                 start_blk += orphan_blocks;
1005         }
1006
1007         write_data_summaries(sbi, start_blk);
1008         start_blk += data_sum_blocks;
1009         if (__remain_node_summaries(cpc->reason)) {
1010                 write_node_summaries(sbi, start_blk);
1011                 start_blk += NR_CURSEG_NODE_TYPE;
1012         }
1013
1014         /* writeout checkpoint block */
1015         update_meta_page(sbi, ckpt, start_blk);
1016
1017         /* wait for previous submitted node/meta pages writeback */
1018         wait_on_all_pages_writeback(sbi);
1019
1020         if (unlikely(f2fs_cp_error(sbi)))
1021                 return;
1022
1023         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LONG_MAX);
1024         filemap_fdatawait_range(META_MAPPING(sbi), 0, LONG_MAX);
1025
1026         /* update user_block_counts */
1027         sbi->last_valid_block_count = sbi->total_valid_block_count;
1028         sbi->alloc_valid_block_count = 0;
1029
1030         /* Here, we only have one bio having CP pack */
1031         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
1032
1033         /* wait for previous submitted meta pages writeback */
1034         wait_on_all_pages_writeback(sbi);
1035
1036         /*
1037          * invalidate meta page which is used temporarily for zeroing out
1038          * block at the end of warm node chain.
1039          */
1040         if (invalidate)
1041                 invalidate_mapping_pages(META_MAPPING(sbi), discard_blk,
1042                                                                 discard_blk);
1043
1044         release_dirty_inode(sbi);
1045
1046         if (unlikely(f2fs_cp_error(sbi)))
1047                 return;
1048
1049         clear_prefree_segments(sbi, cpc);
1050         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1051 }
1052
1053 /*
1054  * We guarantee that this checkpoint procedure will not fail.
1055  */
1056 void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1057 {
1058         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1059         unsigned long long ckpt_ver;
1060
1061         mutex_lock(&sbi->cp_mutex);
1062
1063         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1064                 (cpc->reason == CP_FASTBOOT || cpc->reason == CP_SYNC ||
1065                 (cpc->reason == CP_DISCARD && !sbi->discard_blks)))
1066                 goto out;
1067         if (unlikely(f2fs_cp_error(sbi)))
1068                 goto out;
1069         if (f2fs_readonly(sbi->sb))
1070                 goto out;
1071
1072         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1073
1074         if (block_operations(sbi))
1075                 goto out;
1076
1077         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1078
1079         f2fs_submit_merged_bio(sbi, DATA, WRITE);
1080         f2fs_submit_merged_bio(sbi, NODE, WRITE);
1081         f2fs_submit_merged_bio(sbi, META, WRITE);
1082
1083         /*
1084          * update checkpoint pack index
1085          * Increase the version number so that
1086          * SIT entries and seg summaries are written at correct place
1087          */
1088         ckpt_ver = cur_cp_version(ckpt);
1089         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1090
1091         /* write cached NAT/SIT entries to NAT/SIT area */
1092         flush_nat_entries(sbi);
1093         flush_sit_entries(sbi, cpc);
1094
1095         /* unlock all the fs_lock[] in do_checkpoint() */
1096         do_checkpoint(sbi, cpc);
1097
1098         unblock_operations(sbi);
1099         stat_inc_cp_count(sbi->stat_info);
1100
1101         if (cpc->reason == CP_RECOVERY)
1102                 f2fs_msg(sbi->sb, KERN_NOTICE,
1103                         "checkpoint: version = %llx", ckpt_ver);
1104 out:
1105         mutex_unlock(&sbi->cp_mutex);
1106         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1107 }
1108
1109 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1110 {
1111         int i;
1112
1113         for (i = 0; i < MAX_INO_ENTRY; i++) {
1114                 struct inode_management *im = &sbi->im[i];
1115
1116                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1117                 spin_lock_init(&im->ino_lock);
1118                 INIT_LIST_HEAD(&im->ino_list);
1119                 im->ino_num = 0;
1120         }
1121
1122         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1123                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1124                                 F2FS_ORPHANS_PER_BLOCK;
1125 }
1126
1127 int __init create_checkpoint_caches(void)
1128 {
1129         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1130                         sizeof(struct ino_entry));
1131         if (!ino_entry_slab)
1132                 return -ENOMEM;
1133         inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1134                         sizeof(struct inode_entry));
1135         if (!inode_entry_slab) {
1136                 kmem_cache_destroy(ino_entry_slab);
1137                 return -ENOMEM;
1138         }
1139         return 0;
1140 }
1141
1142 void destroy_checkpoint_caches(void)
1143 {
1144         kmem_cache_destroy(ino_entry_slab);
1145         kmem_cache_destroy(inode_entry_slab);
1146 }