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