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 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
  51                                                         bool is_meta)
  52 {
  53         struct address_space *mapping = META_MAPPING(sbi);
  54         struct page *page;
  55         struct f2fs_io_info fio = {
  56                 .sbi = sbi,
  57                 .type = META,
  58                 .rw = READ_SYNC | REQ_META | REQ_PRIO,
  59                 .blk_addr = index,
  60                 .encrypted_page = NULL,
  61         };
  62
  63         if (unlikely(!is_meta))
  64                 fio.rw &= ~REQ_META;
  65 repeat:
  66         page = grab_cache_page(mapping, index);
  67         if (!page) {
  68                 cond_resched();
  69                 goto repeat;
  70         }
  71         if (PageUptodate(page))
  72                 goto out;
  73
  74         fio.page = page;
  75
  76         if (f2fs_submit_page_bio(&fio)) {
  77                 f2fs_put_page(page, 1);
  78                 goto repeat;
  79         }
  80
  81         lock_page(page);
  82         if (unlikely(page->mapping != mapping)) {
  83                 f2fs_put_page(page, 1);
  84                 goto repeat;
  85         }
  86
  87         /*
  88          * if there is any IO error when accessing device, make our filesystem
  89          * readonly and make sure do not write checkpoint with non-uptodate
  90          * meta page.
  91          */
  92         if (unlikely(!PageUptodate(page)))
  93                 f2fs_stop_checkpoint(sbi);
  94 out:
  95         return page;
  96 }
  97
  98 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  99 {
 100         return __get_meta_page(sbi, index, true);
 101 }
 102
 103 /* for POR only */
 104 struct page *get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 105 {
 106         return __get_meta_page(sbi, index, false);
 107 }
 108
 109 bool is_valid_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type)
 110 {
 111         switch (type) {
 112         case META_NAT:
 113                 break;
 114         case META_SIT:
 115                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 116                         return false;
 117                 break;
 118         case META_SSA:
 119                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 120                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 121                         return false;
 122                 break;
 123         case META_CP:
 124                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 125                         blkaddr < __start_cp_addr(sbi)))
 126                         return false;
 127                 break;
 128         case META_POR:
 129                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 130                         blkaddr < MAIN_BLKADDR(sbi)))
 131                         return false;
 132                 break;
 133         default:
 134                 BUG();
 135         }
 136
 137         return true;
 138 }
 139
 140 /*
 141  * Readahead CP/NAT/SIT/SSA pages
 142  */
 143 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 144                                                         int type, bool sync)
 145 {
 146         block_t prev_blk_addr = 0;
 147         struct page *page;
 148         block_t blkno = start;
 149         struct f2fs_io_info fio = {
 150                 .sbi = sbi,
 151                 .type = META,
 152                 .rw = sync ? (READ_SYNC | REQ_META | REQ_PRIO) : READA,
 153                 .encrypted_page = NULL,
 154         };
 155
 156         if (unlikely(type == META_POR))
 157                 fio.rw &= ~REQ_META;
 158
 159         for (; nrpages-- > 0; blkno++) {
 160
 161                 if (!is_valid_blkaddr(sbi, blkno, type))
 162                         goto out;
 163
 164                 switch (type) {
 165                 case META_NAT:
 166                         if (unlikely(blkno >=
 167                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 168                                 blkno = 0;
 169                         /* get nat block addr */
 170                         fio.blk_addr = current_nat_addr(sbi,
 171                                         blkno * NAT_ENTRY_PER_BLOCK);
 172                         break;
 173                 case META_SIT:
 174                         /* get sit block addr */
 175                         fio.blk_addr = current_sit_addr(sbi,
 176                                         blkno * SIT_ENTRY_PER_BLOCK);
 177                         if (blkno != start && prev_blk_addr + 1 != fio.blk_addr)
 178                                 goto out;
 179                         prev_blk_addr = fio.blk_addr;
 180                         break;
 181                 case META_SSA:
 182                 case META_CP:
 183                 case META_POR:
 184                         fio.blk_addr = blkno;
 185                         break;
 186                 default:
 187                         BUG();
 188                 }
 189
 190                 page = grab_cache_page(META_MAPPING(sbi), fio.blk_addr);
 191                 if (!page)
 192                         continue;
 193                 if (PageUptodate(page)) {
 194                         f2fs_put_page(page, 1);
 195                         continue;
 196                 }
 197
 198                 fio.page = page;
 199                 f2fs_submit_page_mbio(&fio);
 200                 f2fs_put_page(page, 0);
 201         }
 202 out:
 203         f2fs_submit_merged_bio(sbi, META, READ);
 204         return blkno - start;
 205 }
 206
 207 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 208 {
 209         struct page *page;
 210         bool readahead = false;
 211
 212         page = find_get_page(META_MAPPING(sbi), index);
 213         if (!page || (page && !PageUptodate(page)))
 214                 readahead = true;
 215         f2fs_put_page(page, 0);
 216
 217         if (readahead)
 218                 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR, true);
 219 }
 220
 221 static int f2fs_write_meta_page(struct page *page,
 222                                 struct writeback_control *wbc)
 223 {
 224         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 225
 226         trace_f2fs_writepage(page, META);
 227
 228         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 229                 goto redirty_out;
 230         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 231                 goto redirty_out;
 232         if (unlikely(f2fs_cp_error(sbi)))
 233                 goto redirty_out;
 234
 235         f2fs_wait_on_page_writeback(page, META);
 236         write_meta_page(sbi, page);
 237         dec_page_count(sbi, F2FS_DIRTY_META);
 238         unlock_page(page);
 239
 240         if (wbc->for_reclaim)
 241                 f2fs_submit_merged_bio(sbi, META, WRITE);
 242         return 0;
 243
 244 redirty_out:
 245         redirty_page_for_writepage(wbc, page);
 246         return AOP_WRITEPAGE_ACTIVATE;
 247 }
 248
 249 static int f2fs_write_meta_pages(struct address_space *mapping,
 250                                 struct writeback_control *wbc)
 251 {
 252         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 253         long diff, written;
 254
 255         trace_f2fs_writepages(mapping->host, wbc, META);
 256
 257         /* collect a number of dirty meta pages and write together */
 258         if (wbc->for_kupdate ||
 259                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 260                 goto skip_write;
 261
 262         /* if mounting is failed, skip writing node pages */
 263         mutex_lock(&sbi->cp_mutex);
 264         diff = nr_pages_to_write(sbi, META, wbc);
 265         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 266         mutex_unlock(&sbi->cp_mutex);
 267         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 268         return 0;
 269
 270 skip_write:
 271         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 272         return 0;
 273 }
 274
 275 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 276                                                 long nr_to_write)
 277 {
 278         struct address_space *mapping = META_MAPPING(sbi);
 279         pgoff_t index = 0, end = LONG_MAX, prev = LONG_MAX;
 280         struct pagevec pvec;
 281         long nwritten = 0;
 282         struct writeback_control wbc = {
 283                 .for_reclaim = 0,
 284         };
 285
 286         pagevec_init(&pvec, 0);
 287
 288         while (index <= end) {
 289                 int i, nr_pages;
 290                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 291                                 PAGECACHE_TAG_DIRTY,
 292                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 293                 if (unlikely(nr_pages == 0))
 294                         break;
 295
 296                 for (i = 0; i < nr_pages; i++) {
 297                         struct page *page = pvec.pages[i];
 298
 299                         if (prev == LONG_MAX)
 300                                 prev = page->index - 1;
 301                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 302                                 pagevec_release(&pvec);
 303                                 goto stop;
 304                         }
 305
 306                         lock_page(page);
 307
 308                         if (unlikely(page->mapping != mapping)) {
 309 continue_unlock:
 310                                 unlock_page(page);
 311                                 continue;
 312                         }
 313                         if (!PageDirty(page)) {
 314                                 /* someone wrote it for us */
 315                                 goto continue_unlock;
 316                         }
 317
 318                         if (!clear_page_dirty_for_io(page))
 319                                 goto continue_unlock;
 320
 321                         if (mapping->a_ops->writepage(page, &wbc)) {
 322                                 unlock_page(page);
 323                                 break;
 324                         }
 325                         nwritten++;
 326                         prev = page->index;
 327                         if (unlikely(nwritten >= nr_to_write))
 328                                 break;
 329                 }
 330                 pagevec_release(&pvec);
 331                 cond_resched();
 332         }
 333 stop:
 334         if (nwritten)
 335                 f2fs_submit_merged_bio(sbi, type, WRITE);
 336
 337         return nwritten;
 338 }
 339
 340 static int f2fs_set_meta_page_dirty(struct page *page)
 341 {
 342         trace_f2fs_set_page_dirty(page, META);
 343
 344         SetPageUptodate(page);
 345         if (!PageDirty(page)) {
 346                 __set_page_dirty_nobuffers(page);
 347                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 348                 SetPagePrivate(page);
 349                 f2fs_trace_pid(page);
 350                 return 1;
 351         }
 352         return 0;
 353 }
 354
 355 const struct address_space_operations f2fs_meta_aops = {
 356         .writepage      = f2fs_write_meta_page,
 357         .writepages     = f2fs_write_meta_pages,
 358         .set_page_dirty = f2fs_set_meta_page_dirty,
 359         .invalidatepage = f2fs_invalidate_page,
 360         .releasepage    = f2fs_release_page,
 361 };
 362
 363 static void __add_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, *tmp;
 367
 368         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 369 retry:
 370         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 371
 372         spin_lock(&im->ino_lock);
 373         e = radix_tree_lookup(&im->ino_root, ino);
 374         if (!e) {
 375                 e = tmp;
 376                 if (radix_tree_insert(&im->ino_root, ino, e)) {
 377                         spin_unlock(&im->ino_lock);
 378                         radix_tree_preload_end();
 379                         goto retry;
 380                 }
 381                 memset(e, 0, sizeof(struct ino_entry));
 382                 e->ino = ino;
 383
 384                 list_add_tail(&e->list, &im->ino_list);
 385                 if (type != ORPHAN_INO)
 386                         im->ino_num++;
 387         }
 388         spin_unlock(&im->ino_lock);
 389         radix_tree_preload_end();
 390
 391         if (e != tmp)
 392                 kmem_cache_free(ino_entry_slab, tmp);
 393 }
 394
 395 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 396 {
 397         struct inode_management *im = &sbi->im[type];
 398         struct ino_entry *e;
 399
 400         spin_lock(&im->ino_lock);
 401         e = radix_tree_lookup(&im->ino_root, ino);
 402         if (e) {
 403                 list_del(&e->list);
 404                 radix_tree_delete(&im->ino_root, ino);
 405                 im->ino_num--;
 406                 spin_unlock(&im->ino_lock);
 407                 kmem_cache_free(ino_entry_slab, e);
 408                 return;
 409         }
 410         spin_unlock(&im->ino_lock);
 411 }
 412
 413 void add_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 414 {
 415         /* add new dirty ino entry into list */
 416         __add_ino_entry(sbi, ino, type);
 417 }
 418
 419 void remove_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 420 {
 421         /* remove dirty ino entry from list */
 422         __remove_ino_entry(sbi, ino, type);
 423 }
 424
 425 /* mode should be APPEND_INO or UPDATE_INO */
 426 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 427 {
 428         struct inode_management *im = &sbi->im[mode];
 429         struct ino_entry *e;
 430
 431         spin_lock(&im->ino_lock);
 432         e = radix_tree_lookup(&im->ino_root, ino);
 433         spin_unlock(&im->ino_lock);
 434         return e ? true : false;
 435 }
 436
 437 void release_dirty_inode(struct f2fs_sb_info *sbi)
 438 {
 439         struct ino_entry *e, *tmp;
 440         int i;
 441
 442         for (i = APPEND_INO; i <= UPDATE_INO; i++) {
 443                 struct inode_management *im = &sbi->im[i];
 444
 445                 spin_lock(&im->ino_lock);
 446                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 447                         list_del(&e->list);
 448                         radix_tree_delete(&im->ino_root, e->ino);
 449                         kmem_cache_free(ino_entry_slab, e);
 450                         im->ino_num--;
 451                 }
 452                 spin_unlock(&im->ino_lock);
 453         }
 454 }
 455
 456 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 457 {
 458         struct inode_management *im = &sbi->im[ORPHAN_INO];
 459         int err = 0;
 460
 461         spin_lock(&im->ino_lock);
 462         if (unlikely(im->ino_num >= sbi->max_orphans))
 463                 err = -ENOSPC;
 464         else
 465                 im->ino_num++;
 466         spin_unlock(&im->ino_lock);
 467
 468         return err;
 469 }
 470
 471 void release_orphan_inode(struct f2fs_sb_info *sbi)
 472 {
 473         struct inode_management *im = &sbi->im[ORPHAN_INO];
 474
 475         spin_lock(&im->ino_lock);
 476         f2fs_bug_on(sbi, im->ino_num == 0);
 477         im->ino_num--;
 478         spin_unlock(&im->ino_lock);
 479 }
 480
 481 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 482 {
 483         /* add new orphan ino entry into list */
 484         __add_ino_entry(sbi, ino, ORPHAN_INO);
 485 }
 486
 487 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 488 {
 489         /* remove orphan entry from orphan list */
 490         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 491 }
 492
 493 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 494 {
 495         struct inode *inode;
 496
 497         inode = f2fs_iget(sbi->sb, ino);
 498         if (IS_ERR(inode)) {
 499                 /*
 500                  * there should be a bug that we can't find the entry
 501                  * to orphan inode.
 502                  */
 503                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 504                 return PTR_ERR(inode);
 505         }
 506
 507         clear_nlink(inode);
 508
 509         /* truncate all the data during iput */
 510         iput(inode);
 511         return 0;
 512 }
 513
 514 int recover_orphan_inodes(struct f2fs_sb_info *sbi)
 515 {
 516         block_t start_blk, orphan_blocks, i, j;
 517         int err;
 518
 519         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
 520                 return 0;
 521
 522         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 523         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 524
 525         ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 526
 527         for (i = 0; i < orphan_blocks; i++) {
 528                 struct page *page = get_meta_page(sbi, start_blk + i);
 529                 struct f2fs_orphan_block *orphan_blk;
 530
 531                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 532                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 533                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 534                         err = recover_orphan_inode(sbi, ino);
 535                         if (err) {
 536                                 f2fs_put_page(page, 1);
 537                                 return err;
 538                         }
 539                 }
 540                 f2fs_put_page(page, 1);
 541         }
 542         /* clear Orphan Flag */
 543         clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
 544         return 0;
 545 }
 546
 547 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 548 {
 549         struct list_head *head;
 550         struct f2fs_orphan_block *orphan_blk = NULL;
 551         unsigned int nentries = 0;
 552         unsigned short index = 1;
 553         unsigned short orphan_blocks;
 554         struct page *page = NULL;
 555         struct ino_entry *orphan = NULL;
 556         struct inode_management *im = &sbi->im[ORPHAN_INO];
 557
 558         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 559
 560         /*
 561          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 562          * orphan inode operations are covered under f2fs_lock_op().
 563          * And, spin_lock should be avoided due to page operations below.
 564          */
 565         head = &im->ino_list;
 566
 567         /* loop for each orphan inode entry and write them in Jornal block */
 568         list_for_each_entry(orphan, head, list) {
 569                 if (!page) {
 570                         page = grab_meta_page(sbi, start_blk++);
 571                         orphan_blk =
 572                                 (struct f2fs_orphan_block *)page_address(page);
 573                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 574                 }
 575
 576                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 577
 578                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 579                         /*
 580                          * an orphan block is full of 1020 entries,
 581                          * then we need to flush current orphan blocks
 582                          * and bring another one in memory
 583                          */
 584                         orphan_blk->blk_addr = cpu_to_le16(index);
 585                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 586                         orphan_blk->entry_count = cpu_to_le32(nentries);
 587                         set_page_dirty(page);
 588                         f2fs_put_page(page, 1);
 589                         index++;
 590                         nentries = 0;
 591                         page = NULL;
 592                 }
 593         }
 594
 595         if (page) {
 596                 orphan_blk->blk_addr = cpu_to_le16(index);
 597                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 598                 orphan_blk->entry_count = cpu_to_le32(nentries);
 599                 set_page_dirty(page);
 600                 f2fs_put_page(page, 1);
 601         }
 602 }
 603
 604 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 605                                 block_t cp_addr, unsigned long long *version)
 606 {
 607         struct page *cp_page_1, *cp_page_2 = NULL;
 608         unsigned long blk_size = sbi->blocksize;
 609         struct f2fs_checkpoint *cp_block;
 610         unsigned long long cur_version = 0, pre_version = 0;
 611         size_t crc_offset;
 612         __u32 crc = 0;
 613
 614         /* Read the 1st cp block in this CP pack */
 615         cp_page_1 = get_meta_page(sbi, cp_addr);
 616
 617         /* get the version number */
 618         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
 619         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 620         if (crc_offset >= blk_size)
 621                 goto invalid_cp1;
 622
 623         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 624         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 625                 goto invalid_cp1;
 626
 627         pre_version = cur_cp_version(cp_block);
 628
 629         /* Read the 2nd cp block in this CP pack */
 630         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 631         cp_page_2 = get_meta_page(sbi, cp_addr);
 632
 633         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
 634         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 635         if (crc_offset >= blk_size)
 636                 goto invalid_cp2;
 637
 638         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 639         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 640                 goto invalid_cp2;
 641
 642         cur_version = cur_cp_version(cp_block);
 643
 644         if (cur_version == pre_version) {
 645                 *version = cur_version;
 646                 f2fs_put_page(cp_page_2, 1);
 647                 return cp_page_1;
 648         }
 649 invalid_cp2:
 650         f2fs_put_page(cp_page_2, 1);
 651 invalid_cp1:
 652         f2fs_put_page(cp_page_1, 1);
 653         return NULL;
 654 }
 655
 656 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 657 {
 658         struct f2fs_checkpoint *cp_block;
 659         struct f2fs_super_block *fsb = sbi->raw_super;
 660         struct page *cp1, *cp2, *cur_page;
 661         unsigned long blk_size = sbi->blocksize;
 662         unsigned long long cp1_version = 0, cp2_version = 0;
 663         unsigned long long cp_start_blk_no;
 664         unsigned int cp_blks = 1 + __cp_payload(sbi);
 665         block_t cp_blk_no;
 666         int i;
 667
 668         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 669         if (!sbi->ckpt)
 670                 return -ENOMEM;
 671         /*
 672          * Finding out valid cp block involves read both
 673          * sets( cp pack1 and cp pack 2)
 674          */
 675         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 676         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 677
 678         /* The second checkpoint pack should start at the next segment */
 679         cp_start_blk_no += ((unsigned long long)1) <<
 680                                 le32_to_cpu(fsb->log_blocks_per_seg);
 681         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 682
 683         if (cp1 && cp2) {
 684                 if (ver_after(cp2_version, cp1_version))
 685                         cur_page = cp2;
 686                 else
 687                         cur_page = cp1;
 688         } else if (cp1) {
 689                 cur_page = cp1;
 690         } else if (cp2) {
 691                 cur_page = cp2;
 692         } else {
 693                 goto fail_no_cp;
 694         }
 695
 696         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 697         memcpy(sbi->ckpt, cp_block, blk_size);
 698
 699         if (cp_blks <= 1)
 700                 goto done;
 701
 702         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 703         if (cur_page == cp2)
 704                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 705
 706         for (i = 1; i < cp_blks; i++) {
 707                 void *sit_bitmap_ptr;
 708                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 709
 710                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 711                 sit_bitmap_ptr = page_address(cur_page);
 712                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 713                 f2fs_put_page(cur_page, 1);
 714         }
 715 done:
 716         f2fs_put_page(cp1, 1);
 717         f2fs_put_page(cp2, 1);
 718         return 0;
 719
 720 fail_no_cp:
 721         kfree(sbi->ckpt);
 722         return -EINVAL;
 723 }
 724
 725 static int __add_dirty_inode(struct inode *inode, struct inode_entry *new)
 726 {
 727         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 728
 729         if (is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR))
 730                 return -EEXIST;
 731
 732         set_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 733         F2FS_I(inode)->dirty_dir = new;
 734         list_add_tail(&new->list, &sbi->dir_inode_list);
 735         stat_inc_dirty_dir(sbi);
 736         return 0;
 737 }
 738
 739 void update_dirty_page(struct inode *inode, struct page *page)
 740 {
 741         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 742         struct inode_entry *new;
 743         int ret = 0;
 744
 745         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 746                         !S_ISLNK(inode->i_mode))
 747                 return;
 748
 749         if (!S_ISDIR(inode->i_mode)) {
 750                 inode_inc_dirty_pages(inode);
 751                 goto out;
 752         }
 753
 754         new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 755         new->inode = inode;
 756         INIT_LIST_HEAD(&new->list);
 757
 758         spin_lock(&sbi->dir_inode_lock);
 759         ret = __add_dirty_inode(inode, new);
 760         inode_inc_dirty_pages(inode);
 761         spin_unlock(&sbi->dir_inode_lock);
 762
 763         if (ret)
 764                 kmem_cache_free(inode_entry_slab, new);
 765 out:
 766         SetPagePrivate(page);
 767         f2fs_trace_pid(page);
 768 }
 769
 770 void add_dirty_dir_inode(struct inode *inode)
 771 {
 772         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 773         struct inode_entry *new =
 774                         f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 775         int ret = 0;
 776
 777         new->inode = inode;
 778         INIT_LIST_HEAD(&new->list);
 779
 780         spin_lock(&sbi->dir_inode_lock);
 781         ret = __add_dirty_inode(inode, new);
 782         spin_unlock(&sbi->dir_inode_lock);
 783
 784         if (ret)
 785                 kmem_cache_free(inode_entry_slab, new);
 786 }
 787
 788 void remove_dirty_dir_inode(struct inode *inode)
 789 {
 790         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 791         struct inode_entry *entry;
 792
 793         if (!S_ISDIR(inode->i_mode))
 794                 return;
 795
 796         spin_lock(&sbi->dir_inode_lock);
 797         if (get_dirty_pages(inode) ||
 798                         !is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR)) {
 799                 spin_unlock(&sbi->dir_inode_lock);
 800                 return;
 801         }
 802
 803         entry = F2FS_I(inode)->dirty_dir;
 804         list_del(&entry->list);
 805         F2FS_I(inode)->dirty_dir = NULL;
 806         clear_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 807         stat_dec_dirty_dir(sbi);
 808         spin_unlock(&sbi->dir_inode_lock);
 809         kmem_cache_free(inode_entry_slab, entry);
 810
 811         /* Only from the recovery routine */
 812         if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) {
 813                 clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT);
 814                 iput(inode);
 815         }
 816 }
 817
 818 void sync_dirty_dir_inodes(struct f2fs_sb_info *sbi)
 819 {
 820         struct list_head *head;
 821         struct inode_entry *entry;
 822         struct inode *inode;
 823 retry:
 824         if (unlikely(f2fs_cp_error(sbi)))
 825                 return;
 826
 827         spin_lock(&sbi->dir_inode_lock);
 828
 829         head = &sbi->dir_inode_list;
 830         if (list_empty(head)) {
 831                 spin_unlock(&sbi->dir_inode_lock);
 832                 return;
 833         }
 834         entry = list_entry(head->next, struct inode_entry, list);
 835         inode = igrab(entry->inode);
 836         spin_unlock(&sbi->dir_inode_lock);
 837         if (inode) {
 838                 filemap_fdatawrite(inode->i_mapping);
 839                 iput(inode);
 840         } else {
 841                 /*
 842                  * We should submit bio, since it exists several
 843                  * wribacking dentry pages in the freeing inode.
 844                  */
 845                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 846                 cond_resched();
 847         }
 848         goto retry;
 849 }
 850
 851 /*
 852  * Freeze all the FS-operations for checkpoint.
 853  */
 854 static int block_operations(struct f2fs_sb_info *sbi)
 855 {
 856         struct writeback_control wbc = {
 857                 .sync_mode = WB_SYNC_ALL,
 858                 .nr_to_write = LONG_MAX,
 859                 .for_reclaim = 0,
 860         };
 861         struct blk_plug plug;
 862         int err = 0;
 863
 864         blk_start_plug(&plug);
 865
 866 retry_flush_dents:
 867         f2fs_lock_all(sbi);
 868         /* write all the dirty dentry pages */
 869         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 870                 f2fs_unlock_all(sbi);
 871                 sync_dirty_dir_inodes(sbi);
 872                 if (unlikely(f2fs_cp_error(sbi))) {
 873                         err = -EIO;
 874                         goto out;
 875                 }
 876                 goto retry_flush_dents;
 877         }
 878
 879         /*
 880          * POR: we should ensure that there are no dirty node pages
 881          * until finishing nat/sit flush.
 882          */
 883 retry_flush_nodes:
 884         down_write(&sbi->node_write);
 885
 886         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
 887                 up_write(&sbi->node_write);
 888                 sync_node_pages(sbi, 0, &wbc);
 889                 if (unlikely(f2fs_cp_error(sbi))) {
 890                         f2fs_unlock_all(sbi);
 891                         err = -EIO;
 892                         goto out;
 893                 }
 894                 goto retry_flush_nodes;
 895         }
 896 out:
 897         blk_finish_plug(&plug);
 898         return err;
 899 }
 900
 901 static void unblock_operations(struct f2fs_sb_info *sbi)
 902 {
 903         up_write(&sbi->node_write);
 904         f2fs_unlock_all(sbi);
 905 }
 906
 907 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
 908 {
 909         DEFINE_WAIT(wait);
 910
 911         for (;;) {
 912                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
 913
 914                 if (!get_pages(sbi, F2FS_WRITEBACK))
 915                         break;
 916
 917                 io_schedule();
 918         }
 919         finish_wait(&sbi->cp_wait, &wait);
 920 }
 921
 922 static void do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 923 {
 924         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 925         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 926         struct f2fs_nm_info *nm_i = NM_I(sbi);
 927         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
 928         nid_t last_nid = nm_i->next_scan_nid;
 929         block_t start_blk;
 930         unsigned int data_sum_blocks, orphan_blocks;
 931         __u32 crc32 = 0;
 932         int i;
 933         int cp_payload_blks = __cp_payload(sbi);
 934         block_t discard_blk = NEXT_FREE_BLKADDR(sbi, curseg);
 935         bool invalidate = false;
 936
 937         /*
 938          * This avoids to conduct wrong roll-forward operations and uses
 939          * metapages, so should be called prior to sync_meta_pages below.
 940          */
 941         if (discard_next_dnode(sbi, discard_blk))
 942                 invalidate = true;
 943
 944         /* Flush all the NAT/SIT pages */
 945         while (get_pages(sbi, F2FS_DIRTY_META)) {
 946                 sync_meta_pages(sbi, META, LONG_MAX);
 947                 if (unlikely(f2fs_cp_error(sbi)))
 948                         return;
 949         }
 950
 951         next_free_nid(sbi, &last_nid);
 952
 953         /*
 954          * modify checkpoint
 955          * version number is already updated
 956          */
 957         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
 958         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
 959         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
 960         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
 961                 ckpt->cur_node_segno[i] =
 962                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
 963                 ckpt->cur_node_blkoff[i] =
 964                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
 965                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
 966                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
 967         }
 968         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
 969                 ckpt->cur_data_segno[i] =
 970                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
 971                 ckpt->cur_data_blkoff[i] =
 972                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
 973                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
 974                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
 975         }
 976
 977         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
 978         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
 979         ckpt->next_free_nid = cpu_to_le32(last_nid);
 980
 981         /* 2 cp  + n data seg summary + orphan inode blocks */
 982         data_sum_blocks = npages_for_summary_flush(sbi, false);
 983         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
 984                 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 985         else
 986                 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 987
 988         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
 989         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
 990                         orphan_blocks);
 991
 992         if (__remain_node_summaries(cpc->reason))
 993                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
 994                                 cp_payload_blks + data_sum_blocks +
 995                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
 996         else
 997                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
 998                                 cp_payload_blks + data_sum_blocks +
 999                                 orphan_blocks);
1000
1001         if (cpc->reason == CP_UMOUNT)
1002                 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1003         else
1004                 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1005
1006         if (cpc->reason == CP_FASTBOOT)
1007                 set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1008         else
1009                 clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1010
1011         if (orphan_num)
1012                 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1013         else
1014                 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1015
1016         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1017                 set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1018
1019         /* update SIT/NAT bitmap */
1020         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1021         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1022
1023         crc32 = f2fs_crc32(ckpt, le32_to_cpu(ckpt->checksum_offset));
1024         *((__le32 *)((unsigned char *)ckpt +
1025                                 le32_to_cpu(ckpt->checksum_offset)))
1026                                 = cpu_to_le32(crc32);
1027
1028         start_blk = __start_cp_addr(sbi);
1029
1030         /* need to wait for end_io results */
1031         wait_on_all_pages_writeback(sbi);
1032         if (unlikely(f2fs_cp_error(sbi)))
1033                 return;
1034
1035         /* write out checkpoint buffer at block 0 */
1036         update_meta_page(sbi, ckpt, start_blk++);
1037
1038         for (i = 1; i < 1 + cp_payload_blks; i++)
1039                 update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1040                                                         start_blk++);
1041
1042         if (orphan_num) {
1043                 write_orphan_inodes(sbi, start_blk);
1044                 start_blk += orphan_blocks;
1045         }
1046
1047         write_data_summaries(sbi, start_blk);
1048         start_blk += data_sum_blocks;
1049         if (__remain_node_summaries(cpc->reason)) {
1050                 write_node_summaries(sbi, start_blk);
1051                 start_blk += NR_CURSEG_NODE_TYPE;
1052         }
1053
1054         /* writeout checkpoint block */
1055         update_meta_page(sbi, ckpt, start_blk);
1056
1057         /* wait for previous submitted node/meta pages writeback */
1058         wait_on_all_pages_writeback(sbi);
1059
1060         if (unlikely(f2fs_cp_error(sbi)))
1061                 return;
1062
1063         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LONG_MAX);
1064         filemap_fdatawait_range(META_MAPPING(sbi), 0, LONG_MAX);
1065
1066         /* update user_block_counts */
1067         sbi->last_valid_block_count = sbi->total_valid_block_count;
1068         sbi->alloc_valid_block_count = 0;
1069
1070         /* Here, we only have one bio having CP pack */
1071         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
1072
1073         /* wait for previous submitted meta pages writeback */
1074         wait_on_all_pages_writeback(sbi);
1075
1076         /*
1077          * invalidate meta page which is used temporarily for zeroing out
1078          * block at the end of warm node chain.
1079          */
1080         if (invalidate)
1081                 invalidate_mapping_pages(META_MAPPING(sbi), discard_blk,
1082                                                                 discard_blk);
1083
1084         release_dirty_inode(sbi);
1085
1086         if (unlikely(f2fs_cp_error(sbi)))
1087                 return;
1088
1089         clear_prefree_segments(sbi, cpc);
1090         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1091 }
1092
1093 /*
1094  * We guarantee that this checkpoint procedure will not fail.
1095  */
1096 void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1097 {
1098         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1099         unsigned long long ckpt_ver;
1100
1101         mutex_lock(&sbi->cp_mutex);
1102
1103         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1104                 (cpc->reason == CP_FASTBOOT || cpc->reason == CP_SYNC ||
1105                 (cpc->reason == CP_DISCARD && !sbi->discard_blks)))
1106                 goto out;
1107         if (unlikely(f2fs_cp_error(sbi)))
1108                 goto out;
1109         if (f2fs_readonly(sbi->sb))
1110                 goto out;
1111
1112         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1113
1114         if (block_operations(sbi))
1115                 goto out;
1116
1117         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1118
1119         f2fs_submit_merged_bio(sbi, DATA, WRITE);
1120         f2fs_submit_merged_bio(sbi, NODE, WRITE);
1121         f2fs_submit_merged_bio(sbi, META, WRITE);
1122
1123         /*
1124          * update checkpoint pack index
1125          * Increase the version number so that
1126          * SIT entries and seg summaries are written at correct place
1127          */
1128         ckpt_ver = cur_cp_version(ckpt);
1129         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1130
1131         /* write cached NAT/SIT entries to NAT/SIT area */
1132         flush_nat_entries(sbi);
1133         flush_sit_entries(sbi, cpc);
1134
1135         /* unlock all the fs_lock[] in do_checkpoint() */
1136         do_checkpoint(sbi, cpc);
1137
1138         unblock_operations(sbi);
1139         stat_inc_cp_count(sbi->stat_info);
1140
1141         if (cpc->reason == CP_RECOVERY)
1142                 f2fs_msg(sbi->sb, KERN_NOTICE,
1143                         "checkpoint: version = %llx", ckpt_ver);
1144
1145         /* do checkpoint periodically */
1146         sbi->cp_expires = round_jiffies_up(jiffies + HZ * sbi->cp_interval);
1147 out:
1148         mutex_unlock(&sbi->cp_mutex);
1149         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1150 }
1151
1152 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1153 {
1154         int i;
1155
1156         for (i = 0; i < MAX_INO_ENTRY; i++) {
1157                 struct inode_management *im = &sbi->im[i];
1158
1159                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1160                 spin_lock_init(&im->ino_lock);
1161                 INIT_LIST_HEAD(&im->ino_list);
1162                 im->ino_num = 0;
1163         }
1164
1165         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1166                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1167                                 F2FS_ORPHANS_PER_BLOCK;
1168 }
1169
1170 int __init create_checkpoint_caches(void)
1171 {
1172         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1173                         sizeof(struct ino_entry));
1174         if (!ino_entry_slab)
1175                 return -ENOMEM;
1176         inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1177                         sizeof(struct inode_entry));
1178         if (!inode_entry_slab) {
1179                 kmem_cache_destroy(ino_entry_slab);
1180                 return -ENOMEM;
1181         }
1182         return 0;
1183 }
1184
1185 void destroy_checkpoint_caches(void)
1186 {
1187         kmem_cache_destroy(ino_entry_slab);
1188         kmem_cache_destroy(inode_entry_slab);
1189 }