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/events/f2fs.h>
  24
  25 static struct kmem_cache *ino_entry_slab;
  26 static struct kmem_cache *inode_entry_slab;
  27
  28 /*
  29  * We guarantee no failure on the returned page.
  30  */
  31 struct page *grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  32 {
  33         struct address_space *mapping = META_MAPPING(sbi);
  34         struct page *page = NULL;
  35 repeat:
  36         page = grab_cache_page(mapping, index);
  37         if (!page) {
  38                 cond_resched();
  39                 goto repeat;
  40         }
  41         f2fs_wait_on_page_writeback(page, META);
  42         SetPageUptodate(page);
  43         return page;
  44 }
  45
  46 /*
  47  * We guarantee no failure on the returned page.
  48  */
  49 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  50 {
  51         struct address_space *mapping = META_MAPPING(sbi);
  52         struct page *page;
  53 repeat:
  54         page = grab_cache_page(mapping, index);
  55         if (!page) {
  56                 cond_resched();
  57                 goto repeat;
  58         }
  59         if (PageUptodate(page))
  60                 goto out;
  61
  62         if (f2fs_submit_page_bio(sbi, page, index,
  63                                 READ_SYNC | REQ_META | REQ_PRIO))
  64                 goto repeat;
  65
  66         lock_page(page);
  67         if (unlikely(page->mapping != mapping)) {
  68                 f2fs_put_page(page, 1);
  69                 goto repeat;
  70         }
  71 out:
  72         return page;
  73 }
  74
  75 static inline bool is_valid_blkaddr(struct f2fs_sb_info *sbi,
  76                                                 block_t blkaddr, int type)
  77 {
  78         switch (type) {
  79         case META_NAT:
  80                 break;
  81         case META_SIT:
  82                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
  83                         return false;
  84                 break;
  85         case META_SSA:
  86                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
  87                         blkaddr < SM_I(sbi)->ssa_blkaddr))
  88                         return false;
  89                 break;
  90         case META_CP:
  91                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
  92                         blkaddr < __start_cp_addr(sbi)))
  93                         return false;
  94                 break;
  95         case META_POR:
  96                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
  97                         blkaddr < MAIN_BLKADDR(sbi)))
  98                         return false;
  99                 break;
 100         default:
 101                 BUG();
 102         }
 103
 104         return true;
 105 }
 106
 107 /*
 108  * Readahead CP/NAT/SIT/SSA pages
 109  */
 110 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, int type)
 111 {
 112         block_t prev_blk_addr = 0;
 113         struct page *page;
 114         block_t blkno = start;
 115
 116         struct f2fs_io_info fio = {
 117                 .type = META,
 118                 .rw = READ_SYNC | REQ_META | REQ_PRIO
 119         };
 120
 121         for (; nrpages-- > 0; blkno++) {
 122                 block_t blk_addr;
 123
 124                 if (!is_valid_blkaddr(sbi, blkno, type))
 125                         goto out;
 126
 127                 switch (type) {
 128                 case META_NAT:
 129                         if (unlikely(blkno >=
 130                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 131                                 blkno = 0;
 132                         /* get nat block addr */
 133                         blk_addr = current_nat_addr(sbi,
 134                                         blkno * NAT_ENTRY_PER_BLOCK);
 135                         break;
 136                 case META_SIT:
 137                         /* get sit block addr */
 138                         blk_addr = current_sit_addr(sbi,
 139                                         blkno * SIT_ENTRY_PER_BLOCK);
 140                         if (blkno != start && prev_blk_addr + 1 != blk_addr)
 141                                 goto out;
 142                         prev_blk_addr = blk_addr;
 143                         break;
 144                 case META_SSA:
 145                 case META_CP:
 146                 case META_POR:
 147                         blk_addr = blkno;
 148                         break;
 149                 default:
 150                         BUG();
 151                 }
 152
 153                 page = grab_cache_page(META_MAPPING(sbi), blk_addr);
 154                 if (!page)
 155                         continue;
 156                 if (PageUptodate(page)) {
 157                         f2fs_put_page(page, 1);
 158                         continue;
 159                 }
 160
 161                 f2fs_submit_page_mbio(sbi, page, blk_addr, &fio);
 162                 f2fs_put_page(page, 0);
 163         }
 164 out:
 165         f2fs_submit_merged_bio(sbi, META, READ);
 166         return blkno - start;
 167 }
 168
 169 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 170 {
 171         struct page *page;
 172         bool readahead = false;
 173
 174         page = find_get_page(META_MAPPING(sbi), index);
 175         if (!page || (page && !PageUptodate(page)))
 176                 readahead = true;
 177         f2fs_put_page(page, 0);
 178
 179         if (readahead)
 180                 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR);
 181 }
 182
 183 static int f2fs_write_meta_page(struct page *page,
 184                                 struct writeback_control *wbc)
 185 {
 186         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 187
 188         trace_f2fs_writepage(page, META);
 189
 190         if (unlikely(sbi->por_doing))
 191                 goto redirty_out;
 192         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 193                 goto redirty_out;
 194         if (unlikely(f2fs_cp_error(sbi)))
 195                 goto redirty_out;
 196
 197         f2fs_wait_on_page_writeback(page, META);
 198         write_meta_page(sbi, page);
 199         dec_page_count(sbi, F2FS_DIRTY_META);
 200         unlock_page(page);
 201
 202         if (wbc->for_reclaim)
 203                 f2fs_submit_merged_bio(sbi, META, WRITE);
 204         return 0;
 205
 206 redirty_out:
 207         redirty_page_for_writepage(wbc, page);
 208         return AOP_WRITEPAGE_ACTIVATE;
 209 }
 210
 211 static int f2fs_write_meta_pages(struct address_space *mapping,
 212                                 struct writeback_control *wbc)
 213 {
 214         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 215         long diff, written;
 216
 217         trace_f2fs_writepages(mapping->host, wbc, META);
 218
 219         /* collect a number of dirty meta pages and write together */
 220         if (wbc->for_kupdate ||
 221                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 222                 goto skip_write;
 223
 224         /* if mounting is failed, skip writing node pages */
 225         mutex_lock(&sbi->cp_mutex);
 226         diff = nr_pages_to_write(sbi, META, wbc);
 227         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 228         mutex_unlock(&sbi->cp_mutex);
 229         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 230         return 0;
 231
 232 skip_write:
 233         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 234         return 0;
 235 }
 236
 237 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 238                                                 long nr_to_write)
 239 {
 240         struct address_space *mapping = META_MAPPING(sbi);
 241         pgoff_t index = 0, end = LONG_MAX;
 242         struct pagevec pvec;
 243         long nwritten = 0;
 244         struct writeback_control wbc = {
 245                 .for_reclaim = 0,
 246         };
 247
 248         pagevec_init(&pvec, 0);
 249
 250         while (index <= end) {
 251                 int i, nr_pages;
 252                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 253                                 PAGECACHE_TAG_DIRTY,
 254                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 255                 if (unlikely(nr_pages == 0))
 256                         break;
 257
 258                 for (i = 0; i < nr_pages; i++) {
 259                         struct page *page = pvec.pages[i];
 260
 261                         lock_page(page);
 262
 263                         if (unlikely(page->mapping != mapping)) {
 264 continue_unlock:
 265                                 unlock_page(page);
 266                                 continue;
 267                         }
 268                         if (!PageDirty(page)) {
 269                                 /* someone wrote it for us */
 270                                 goto continue_unlock;
 271                         }
 272
 273                         if (!clear_page_dirty_for_io(page))
 274                                 goto continue_unlock;
 275
 276                         if (f2fs_write_meta_page(page, &wbc)) {
 277                                 unlock_page(page);
 278                                 break;
 279                         }
 280                         nwritten++;
 281                         if (unlikely(nwritten >= nr_to_write))
 282                                 break;
 283                 }
 284                 pagevec_release(&pvec);
 285                 cond_resched();
 286         }
 287
 288         if (nwritten)
 289                 f2fs_submit_merged_bio(sbi, type, WRITE);
 290
 291         return nwritten;
 292 }
 293
 294 static int f2fs_set_meta_page_dirty(struct page *page)
 295 {
 296         trace_f2fs_set_page_dirty(page, META);
 297
 298         SetPageUptodate(page);
 299         if (!PageDirty(page)) {
 300                 __set_page_dirty_nobuffers(page);
 301                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 302                 return 1;
 303         }
 304         return 0;
 305 }
 306
 307 const struct address_space_operations f2fs_meta_aops = {
 308         .writepage      = f2fs_write_meta_page,
 309         .writepages     = f2fs_write_meta_pages,
 310         .set_page_dirty = f2fs_set_meta_page_dirty,
 311 };
 312
 313 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 314 {
 315         struct inode_management *im = &sbi->im[type];
 316         struct ino_entry *e;
 317 retry:
 318         if (radix_tree_preload(GFP_NOFS)) {
 319                 cond_resched();
 320                 goto retry;
 321         }
 322
 323         spin_lock(&im->ino_lock);
 324
 325         e = radix_tree_lookup(&im->ino_root, ino);
 326         if (!e) {
 327                 e = kmem_cache_alloc(ino_entry_slab, GFP_ATOMIC);
 328                 if (!e) {
 329                         spin_unlock(&im->ino_lock);
 330                         radix_tree_preload_end();
 331                         goto retry;
 332                 }
 333                 if (radix_tree_insert(&im->ino_root, ino, e)) {
 334                         spin_unlock(&im->ino_lock);
 335                         kmem_cache_free(ino_entry_slab, e);
 336                         radix_tree_preload_end();
 337                         goto retry;
 338                 }
 339                 memset(e, 0, sizeof(struct ino_entry));
 340                 e->ino = ino;
 341
 342                 list_add_tail(&e->list, &im->ino_list);
 343                 if (type != ORPHAN_INO)
 344                         im->ino_num++;
 345         }
 346         spin_unlock(&im->ino_lock);
 347         radix_tree_preload_end();
 348 }
 349
 350 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 351 {
 352         struct inode_management *im = &sbi->im[type];
 353         struct ino_entry *e;
 354
 355         spin_lock(&im->ino_lock);
 356         e = radix_tree_lookup(&im->ino_root, ino);
 357         if (e) {
 358                 list_del(&e->list);
 359                 radix_tree_delete(&im->ino_root, ino);
 360                 im->ino_num--;
 361                 spin_unlock(&im->ino_lock);
 362                 kmem_cache_free(ino_entry_slab, e);
 363                 return;
 364         }
 365         spin_unlock(&im->ino_lock);
 366 }
 367
 368 void add_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 369 {
 370         /* add new dirty ino entry into list */
 371         __add_ino_entry(sbi, ino, type);
 372 }
 373
 374 void remove_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 375 {
 376         /* remove dirty ino entry from list */
 377         __remove_ino_entry(sbi, ino, type);
 378 }
 379
 380 /* mode should be APPEND_INO or UPDATE_INO */
 381 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 382 {
 383         struct inode_management *im = &sbi->im[mode];
 384         struct ino_entry *e;
 385
 386         spin_lock(&im->ino_lock);
 387         e = radix_tree_lookup(&im->ino_root, ino);
 388         spin_unlock(&im->ino_lock);
 389         return e ? true : false;
 390 }
 391
 392 void release_dirty_inode(struct f2fs_sb_info *sbi)
 393 {
 394         struct ino_entry *e, *tmp;
 395         int i;
 396
 397         for (i = APPEND_INO; i <= UPDATE_INO; i++) {
 398                 struct inode_management *im = &sbi->im[i];
 399
 400                 spin_lock(&im->ino_lock);
 401                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 402                         list_del(&e->list);
 403                         radix_tree_delete(&im->ino_root, e->ino);
 404                         kmem_cache_free(ino_entry_slab, e);
 405                         im->ino_num--;
 406                 }
 407                 spin_unlock(&im->ino_lock);
 408         }
 409 }
 410
 411 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 412 {
 413         struct inode_management *im = &sbi->im[ORPHAN_INO];
 414         int err = 0;
 415
 416         spin_lock(&im->ino_lock);
 417         if (unlikely(im->ino_num >= sbi->max_orphans))
 418                 err = -ENOSPC;
 419         else
 420                 im->ino_num++;
 421         spin_unlock(&im->ino_lock);
 422
 423         return err;
 424 }
 425
 426 void release_orphan_inode(struct f2fs_sb_info *sbi)
 427 {
 428         struct inode_management *im = &sbi->im[ORPHAN_INO];
 429
 430         spin_lock(&im->ino_lock);
 431         f2fs_bug_on(sbi, im->ino_num == 0);
 432         im->ino_num--;
 433         spin_unlock(&im->ino_lock);
 434 }
 435
 436 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 437 {
 438         /* add new orphan ino entry into list */
 439         __add_ino_entry(sbi, ino, ORPHAN_INO);
 440 }
 441
 442 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 443 {
 444         /* remove orphan entry from orphan list */
 445         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 446 }
 447
 448 static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 449 {
 450         struct inode *inode = f2fs_iget(sbi->sb, ino);
 451         f2fs_bug_on(sbi, IS_ERR(inode));
 452         clear_nlink(inode);
 453
 454         /* truncate all the data during iput */
 455         iput(inode);
 456 }
 457
 458 void recover_orphan_inodes(struct f2fs_sb_info *sbi)
 459 {
 460         block_t start_blk, orphan_blkaddr, i, j;
 461
 462         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
 463                 return;
 464
 465         sbi->por_doing = true;
 466
 467         start_blk = __start_cp_addr(sbi) + 1 +
 468                 le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
 469         orphan_blkaddr = __start_sum_addr(sbi) - 1;
 470
 471         ra_meta_pages(sbi, start_blk, orphan_blkaddr, META_CP);
 472
 473         for (i = 0; i < orphan_blkaddr; i++) {
 474                 struct page *page = get_meta_page(sbi, start_blk + i);
 475                 struct f2fs_orphan_block *orphan_blk;
 476
 477                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 478                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 479                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 480                         recover_orphan_inode(sbi, ino);
 481                 }
 482                 f2fs_put_page(page, 1);
 483         }
 484         /* clear Orphan Flag */
 485         clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
 486         sbi->por_doing = false;
 487         return;
 488 }
 489
 490 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 491 {
 492         struct list_head *head;
 493         struct f2fs_orphan_block *orphan_blk = NULL;
 494         unsigned int nentries = 0;
 495         unsigned short index;
 496         unsigned short orphan_blocks;
 497         struct page *page = NULL;
 498         struct ino_entry *orphan = NULL;
 499         struct inode_management *im = &sbi->im[ORPHAN_INO];
 500
 501         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 502
 503         for (index = 0; index < orphan_blocks; index++)
 504                 grab_meta_page(sbi, start_blk + index);
 505
 506         index = 1;
 507         spin_lock(&im->ino_lock);
 508         head = &im->ino_list;
 509
 510         /* loop for each orphan inode entry and write them in Jornal block */
 511         list_for_each_entry(orphan, head, list) {
 512                 if (!page) {
 513                         page = find_get_page(META_MAPPING(sbi), start_blk++);
 514                         f2fs_bug_on(sbi, !page);
 515                         orphan_blk =
 516                                 (struct f2fs_orphan_block *)page_address(page);
 517                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 518                         f2fs_put_page(page, 0);
 519                 }
 520
 521                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 522
 523                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 524                         /*
 525                          * an orphan block is full of 1020 entries,
 526                          * then we need to flush current orphan blocks
 527                          * and bring another one in memory
 528                          */
 529                         orphan_blk->blk_addr = cpu_to_le16(index);
 530                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 531                         orphan_blk->entry_count = cpu_to_le32(nentries);
 532                         set_page_dirty(page);
 533                         f2fs_put_page(page, 1);
 534                         index++;
 535                         nentries = 0;
 536                         page = NULL;
 537                 }
 538         }
 539
 540         if (page) {
 541                 orphan_blk->blk_addr = cpu_to_le16(index);
 542                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 543                 orphan_blk->entry_count = cpu_to_le32(nentries);
 544                 set_page_dirty(page);
 545                 f2fs_put_page(page, 1);
 546         }
 547
 548         spin_unlock(&im->ino_lock);
 549 }
 550
 551 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 552                                 block_t cp_addr, unsigned long long *version)
 553 {
 554         struct page *cp_page_1, *cp_page_2 = NULL;
 555         unsigned long blk_size = sbi->blocksize;
 556         struct f2fs_checkpoint *cp_block;
 557         unsigned long long cur_version = 0, pre_version = 0;
 558         size_t crc_offset;
 559         __u32 crc = 0;
 560
 561         /* Read the 1st cp block in this CP pack */
 562         cp_page_1 = get_meta_page(sbi, cp_addr);
 563
 564         /* get the version number */
 565         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
 566         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 567         if (crc_offset >= blk_size)
 568                 goto invalid_cp1;
 569
 570         crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset)));
 571         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 572                 goto invalid_cp1;
 573
 574         pre_version = cur_cp_version(cp_block);
 575
 576         /* Read the 2nd cp block in this CP pack */
 577         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 578         cp_page_2 = get_meta_page(sbi, cp_addr);
 579
 580         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
 581         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 582         if (crc_offset >= blk_size)
 583                 goto invalid_cp2;
 584
 585         crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset)));
 586         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 587                 goto invalid_cp2;
 588
 589         cur_version = cur_cp_version(cp_block);
 590
 591         if (cur_version == pre_version) {
 592                 *version = cur_version;
 593                 f2fs_put_page(cp_page_2, 1);
 594                 return cp_page_1;
 595         }
 596 invalid_cp2:
 597         f2fs_put_page(cp_page_2, 1);
 598 invalid_cp1:
 599         f2fs_put_page(cp_page_1, 1);
 600         return NULL;
 601 }
 602
 603 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 604 {
 605         struct f2fs_checkpoint *cp_block;
 606         struct f2fs_super_block *fsb = sbi->raw_super;
 607         struct page *cp1, *cp2, *cur_page;
 608         unsigned long blk_size = sbi->blocksize;
 609         unsigned long long cp1_version = 0, cp2_version = 0;
 610         unsigned long long cp_start_blk_no;
 611         unsigned int cp_blks = 1 + le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
 612         block_t cp_blk_no;
 613         int i;
 614
 615         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 616         if (!sbi->ckpt)
 617                 return -ENOMEM;
 618         /*
 619          * Finding out valid cp block involves read both
 620          * sets( cp pack1 and cp pack 2)
 621          */
 622         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 623         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 624
 625         /* The second checkpoint pack should start at the next segment */
 626         cp_start_blk_no += ((unsigned long long)1) <<
 627                                 le32_to_cpu(fsb->log_blocks_per_seg);
 628         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 629
 630         if (cp1 && cp2) {
 631                 if (ver_after(cp2_version, cp1_version))
 632                         cur_page = cp2;
 633                 else
 634                         cur_page = cp1;
 635         } else if (cp1) {
 636                 cur_page = cp1;
 637         } else if (cp2) {
 638                 cur_page = cp2;
 639         } else {
 640                 goto fail_no_cp;
 641         }
 642
 643         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 644         memcpy(sbi->ckpt, cp_block, blk_size);
 645
 646         if (cp_blks <= 1)
 647                 goto done;
 648
 649         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 650         if (cur_page == cp2)
 651                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 652
 653         for (i = 1; i < cp_blks; i++) {
 654                 void *sit_bitmap_ptr;
 655                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 656
 657                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 658                 sit_bitmap_ptr = page_address(cur_page);
 659                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 660                 f2fs_put_page(cur_page, 1);
 661         }
 662 done:
 663         f2fs_put_page(cp1, 1);
 664         f2fs_put_page(cp2, 1);
 665         return 0;
 666
 667 fail_no_cp:
 668         kfree(sbi->ckpt);
 669         return -EINVAL;
 670 }
 671
 672 static int __add_dirty_inode(struct inode *inode, struct dir_inode_entry *new)
 673 {
 674         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 675
 676         if (is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR))
 677                 return -EEXIST;
 678
 679         set_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 680         F2FS_I(inode)->dirty_dir = new;
 681         list_add_tail(&new->list, &sbi->dir_inode_list);
 682         stat_inc_dirty_dir(sbi);
 683         return 0;
 684 }
 685
 686 void update_dirty_page(struct inode *inode, struct page *page)
 687 {
 688         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 689         struct dir_inode_entry *new;
 690         int ret = 0;
 691
 692         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode))
 693                 return;
 694
 695         if (!S_ISDIR(inode->i_mode)) {
 696                 inode_inc_dirty_pages(inode);
 697                 goto out;
 698         }
 699
 700         new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 701         new->inode = inode;
 702         INIT_LIST_HEAD(&new->list);
 703
 704         spin_lock(&sbi->dir_inode_lock);
 705         ret = __add_dirty_inode(inode, new);
 706         inode_inc_dirty_pages(inode);
 707         spin_unlock(&sbi->dir_inode_lock);
 708
 709         if (ret)
 710                 kmem_cache_free(inode_entry_slab, new);
 711 out:
 712         SetPagePrivate(page);
 713 }
 714
 715 void add_dirty_dir_inode(struct inode *inode)
 716 {
 717         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 718         struct dir_inode_entry *new =
 719                         f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 720         int ret = 0;
 721
 722         new->inode = inode;
 723         INIT_LIST_HEAD(&new->list);
 724
 725         spin_lock(&sbi->dir_inode_lock);
 726         ret = __add_dirty_inode(inode, new);
 727         spin_unlock(&sbi->dir_inode_lock);
 728
 729         if (ret)
 730                 kmem_cache_free(inode_entry_slab, new);
 731 }
 732
 733 void remove_dirty_dir_inode(struct inode *inode)
 734 {
 735         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 736         struct dir_inode_entry *entry;
 737
 738         if (!S_ISDIR(inode->i_mode))
 739                 return;
 740
 741         spin_lock(&sbi->dir_inode_lock);
 742         if (get_dirty_pages(inode) ||
 743                         !is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR)) {
 744                 spin_unlock(&sbi->dir_inode_lock);
 745                 return;
 746         }
 747
 748         entry = F2FS_I(inode)->dirty_dir;
 749         list_del(&entry->list);
 750         F2FS_I(inode)->dirty_dir = NULL;
 751         clear_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 752         stat_dec_dirty_dir(sbi);
 753         spin_unlock(&sbi->dir_inode_lock);
 754         kmem_cache_free(inode_entry_slab, entry);
 755
 756         /* Only from the recovery routine */
 757         if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) {
 758                 clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT);
 759                 iput(inode);
 760         }
 761 }
 762
 763 void sync_dirty_dir_inodes(struct f2fs_sb_info *sbi)
 764 {
 765         struct list_head *head;
 766         struct dir_inode_entry *entry;
 767         struct inode *inode;
 768 retry:
 769         if (unlikely(f2fs_cp_error(sbi)))
 770                 return;
 771
 772         spin_lock(&sbi->dir_inode_lock);
 773
 774         head = &sbi->dir_inode_list;
 775         if (list_empty(head)) {
 776                 spin_unlock(&sbi->dir_inode_lock);
 777                 return;
 778         }
 779         entry = list_entry(head->next, struct dir_inode_entry, list);
 780         inode = igrab(entry->inode);
 781         spin_unlock(&sbi->dir_inode_lock);
 782         if (inode) {
 783                 filemap_fdatawrite(inode->i_mapping);
 784                 iput(inode);
 785         } else {
 786                 /*
 787                  * We should submit bio, since it exists several
 788                  * wribacking dentry pages in the freeing inode.
 789                  */
 790                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 791         }
 792         goto retry;
 793 }
 794
 795 /*
 796  * Freeze all the FS-operations for checkpoint.
 797  */
 798 static int block_operations(struct f2fs_sb_info *sbi)
 799 {
 800         struct writeback_control wbc = {
 801                 .sync_mode = WB_SYNC_ALL,
 802                 .nr_to_write = LONG_MAX,
 803                 .for_reclaim = 0,
 804         };
 805         struct blk_plug plug;
 806         int err = 0;
 807
 808         blk_start_plug(&plug);
 809
 810 retry_flush_dents:
 811         f2fs_lock_all(sbi);
 812         /* write all the dirty dentry pages */
 813         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 814                 f2fs_unlock_all(sbi);
 815                 sync_dirty_dir_inodes(sbi);
 816                 if (unlikely(f2fs_cp_error(sbi))) {
 817                         err = -EIO;
 818                         goto out;
 819                 }
 820                 goto retry_flush_dents;
 821         }
 822
 823         /*
 824          * POR: we should ensure that there are no dirty node pages
 825          * until finishing nat/sit flush.
 826          */
 827 retry_flush_nodes:
 828         down_write(&sbi->node_write);
 829
 830         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
 831                 up_write(&sbi->node_write);
 832                 sync_node_pages(sbi, 0, &wbc);
 833                 if (unlikely(f2fs_cp_error(sbi))) {
 834                         f2fs_unlock_all(sbi);
 835                         err = -EIO;
 836                         goto out;
 837                 }
 838                 goto retry_flush_nodes;
 839         }
 840 out:
 841         blk_finish_plug(&plug);
 842         return err;
 843 }
 844
 845 static void unblock_operations(struct f2fs_sb_info *sbi)
 846 {
 847         up_write(&sbi->node_write);
 848         f2fs_unlock_all(sbi);
 849 }
 850
 851 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
 852 {
 853         DEFINE_WAIT(wait);
 854
 855         for (;;) {
 856                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
 857
 858                 if (!get_pages(sbi, F2FS_WRITEBACK))
 859                         break;
 860
 861                 io_schedule();
 862         }
 863         finish_wait(&sbi->cp_wait, &wait);
 864 }
 865
 866 static void do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 867 {
 868         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 869         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 870         struct f2fs_nm_info *nm_i = NM_I(sbi);
 871         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
 872         nid_t last_nid = nm_i->next_scan_nid;
 873         block_t start_blk;
 874         struct page *cp_page;
 875         unsigned int data_sum_blocks, orphan_blocks;
 876         __u32 crc32 = 0;
 877         void *kaddr;
 878         int i;
 879         int cp_payload_blks = le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
 880
 881         /*
 882          * This avoids to conduct wrong roll-forward operations and uses
 883          * metapages, so should be called prior to sync_meta_pages below.
 884          */
 885         discard_next_dnode(sbi, NEXT_FREE_BLKADDR(sbi, curseg));
 886
 887         /* Flush all the NAT/SIT pages */
 888         while (get_pages(sbi, F2FS_DIRTY_META)) {
 889                 sync_meta_pages(sbi, META, LONG_MAX);
 890                 if (unlikely(f2fs_cp_error(sbi)))
 891                         return;
 892         }
 893
 894         next_free_nid(sbi, &last_nid);
 895
 896         /*
 897          * modify checkpoint
 898          * version number is already updated
 899          */
 900         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
 901         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
 902         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
 903         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
 904                 ckpt->cur_node_segno[i] =
 905                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
 906                 ckpt->cur_node_blkoff[i] =
 907                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
 908                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
 909                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
 910         }
 911         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
 912                 ckpt->cur_data_segno[i] =
 913                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
 914                 ckpt->cur_data_blkoff[i] =
 915                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
 916                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
 917                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
 918         }
 919
 920         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
 921         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
 922         ckpt->next_free_nid = cpu_to_le32(last_nid);
 923
 924         /* 2 cp  + n data seg summary + orphan inode blocks */
 925         data_sum_blocks = npages_for_summary_flush(sbi);
 926         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
 927                 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 928         else
 929                 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 930
 931         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
 932         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
 933                         orphan_blocks);
 934
 935         if (cpc->reason == CP_UMOUNT) {
 936                 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 937                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
 938                                 cp_payload_blks + data_sum_blocks +
 939                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
 940         } else {
 941                 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 942                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
 943                                 cp_payload_blks + data_sum_blocks +
 944                                 orphan_blocks);
 945         }
 946
 947         if (orphan_num)
 948                 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 949         else
 950                 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 951
 952         if (sbi->need_fsck)
 953                 set_ckpt_flags(ckpt, CP_FSCK_FLAG);
 954
 955         /* update SIT/NAT bitmap */
 956         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
 957         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
 958
 959         crc32 = f2fs_crc32(ckpt, le32_to_cpu(ckpt->checksum_offset));
 960         *((__le32 *)((unsigned char *)ckpt +
 961                                 le32_to_cpu(ckpt->checksum_offset)))
 962                                 = cpu_to_le32(crc32);
 963
 964         start_blk = __start_cp_addr(sbi);
 965
 966         /* write out checkpoint buffer at block 0 */
 967         cp_page = grab_meta_page(sbi, start_blk++);
 968         kaddr = page_address(cp_page);
 969         memcpy(kaddr, ckpt, (1 << sbi->log_blocksize));
 970         set_page_dirty(cp_page);
 971         f2fs_put_page(cp_page, 1);
 972
 973         for (i = 1; i < 1 + cp_payload_blks; i++) {
 974                 cp_page = grab_meta_page(sbi, start_blk++);
 975                 kaddr = page_address(cp_page);
 976                 memcpy(kaddr, (char *)ckpt + i * F2FS_BLKSIZE,
 977                                 (1 << sbi->log_blocksize));
 978                 set_page_dirty(cp_page);
 979                 f2fs_put_page(cp_page, 1);
 980         }
 981
 982         if (orphan_num) {
 983                 write_orphan_inodes(sbi, start_blk);
 984                 start_blk += orphan_blocks;
 985         }
 986
 987         write_data_summaries(sbi, start_blk);
 988         start_blk += data_sum_blocks;
 989         if (cpc->reason == CP_UMOUNT) {
 990                 write_node_summaries(sbi, start_blk);
 991                 start_blk += NR_CURSEG_NODE_TYPE;
 992         }
 993
 994         /* writeout checkpoint block */
 995         cp_page = grab_meta_page(sbi, start_blk);
 996         kaddr = page_address(cp_page);
 997         memcpy(kaddr, ckpt, (1 << sbi->log_blocksize));
 998         set_page_dirty(cp_page);
 999         f2fs_put_page(cp_page, 1);
1000
1001         /* wait for previous submitted node/meta pages writeback */
1002         wait_on_all_pages_writeback(sbi);
1003
1004         if (unlikely(f2fs_cp_error(sbi)))
1005                 return;
1006
1007         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LONG_MAX);
1008         filemap_fdatawait_range(META_MAPPING(sbi), 0, LONG_MAX);
1009
1010         /* update user_block_counts */
1011         sbi->last_valid_block_count = sbi->total_valid_block_count;
1012         sbi->alloc_valid_block_count = 0;
1013
1014         /* Here, we only have one bio having CP pack */
1015         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
1016
1017         /* wait for previous submitted meta pages writeback */
1018         wait_on_all_pages_writeback(sbi);
1019
1020         release_dirty_inode(sbi);
1021
1022         if (unlikely(f2fs_cp_error(sbi)))
1023                 return;
1024
1025         clear_prefree_segments(sbi);
1026         F2FS_RESET_SB_DIRT(sbi);
1027 }
1028
1029 /*
1030  * We guarantee that this checkpoint procedure will not fail.
1031  */
1032 void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1033 {
1034         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1035         unsigned long long ckpt_ver;
1036
1037         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1038
1039         mutex_lock(&sbi->cp_mutex);
1040
1041         if (!sbi->s_dirty && cpc->reason != CP_DISCARD)
1042                 goto out;
1043         if (unlikely(f2fs_cp_error(sbi)))
1044                 goto out;
1045         if (block_operations(sbi))
1046                 goto out;
1047
1048         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1049
1050         f2fs_submit_merged_bio(sbi, DATA, WRITE);
1051         f2fs_submit_merged_bio(sbi, NODE, WRITE);
1052         f2fs_submit_merged_bio(sbi, META, WRITE);
1053
1054         /*
1055          * update checkpoint pack index
1056          * Increase the version number so that
1057          * SIT entries and seg summaries are written at correct place
1058          */
1059         ckpt_ver = cur_cp_version(ckpt);
1060         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1061
1062         /* write cached NAT/SIT entries to NAT/SIT area */
1063         flush_nat_entries(sbi);
1064         flush_sit_entries(sbi, cpc);
1065
1066         /* unlock all the fs_lock[] in do_checkpoint() */
1067         do_checkpoint(sbi, cpc);
1068
1069         unblock_operations(sbi);
1070         stat_inc_cp_count(sbi->stat_info);
1071 out:
1072         mutex_unlock(&sbi->cp_mutex);
1073         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1074 }
1075
1076 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1077 {
1078         int i;
1079
1080         for (i = 0; i < MAX_INO_ENTRY; i++) {
1081                 struct inode_management *im = &sbi->im[i];
1082
1083                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1084                 spin_lock_init(&im->ino_lock);
1085                 INIT_LIST_HEAD(&im->ino_list);
1086                 im->ino_num = 0;
1087         }
1088
1089         /*
1090          * considering 512 blocks in a segment 8 blocks are needed for cp
1091          * and log segment summaries. Remaining blocks are used to keep
1092          * orphan entries with the limitation one reserved segment
1093          * for cp pack we can have max 1020*504 orphan entries
1094          */
1095         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1096                         NR_CURSEG_TYPE) * F2FS_ORPHANS_PER_BLOCK;
1097 }
1098
1099 int __init create_checkpoint_caches(void)
1100 {
1101         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1102                         sizeof(struct ino_entry));
1103         if (!ino_entry_slab)
1104                 return -ENOMEM;
1105         inode_entry_slab = f2fs_kmem_cache_create("f2fs_dirty_dir_entry",
1106                         sizeof(struct dir_inode_entry));
1107         if (!inode_entry_slab) {
1108                 kmem_cache_destroy(ino_entry_slab);
1109                 return -ENOMEM;
1110         }
1111         return 0;
1112 }
1113
1114 void destroy_checkpoint_caches(void)
1115 {
1116         kmem_cache_destroy(ino_entry_slab);
1117         kmem_cache_destroy(inode_entry_slab);
1118 }