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                 .type = META,
  56                 .rw = READ_SYNC | REQ_META | REQ_PRIO,
  57                 .blk_addr = index,
  58         };
  59 repeat:
  60         page = grab_cache_page(mapping, index);
  61         if (!page) {
  62                 cond_resched();
  63                 goto repeat;
  64         }
  65         if (PageUptodate(page))
  66                 goto out;
  67
  68         if (f2fs_submit_page_bio(sbi, page, &fio))
  69                 goto repeat;
  70
  71         lock_page(page);
  72         if (unlikely(page->mapping != mapping)) {
  73                 f2fs_put_page(page, 1);
  74                 goto repeat;
  75         }
  76 out:
  77         return page;
  78 }
  79
  80 static inline bool is_valid_blkaddr(struct f2fs_sb_info *sbi,
  81                                                 block_t blkaddr, int type)
  82 {
  83         switch (type) {
  84         case META_NAT:
  85                 break;
  86         case META_SIT:
  87                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
  88                         return false;
  89                 break;
  90         case META_SSA:
  91                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
  92                         blkaddr < SM_I(sbi)->ssa_blkaddr))
  93                         return false;
  94                 break;
  95         case META_CP:
  96                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
  97                         blkaddr < __start_cp_addr(sbi)))
  98                         return false;
  99                 break;
 100         case META_POR:
 101                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 102                         blkaddr < MAIN_BLKADDR(sbi)))
 103                         return false;
 104                 break;
 105         default:
 106                 BUG();
 107         }
 108
 109         return true;
 110 }
 111
 112 /*
 113  * Readahead CP/NAT/SIT/SSA pages
 114  */
 115 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, int type)
 116 {
 117         block_t prev_blk_addr = 0;
 118         struct page *page;
 119         block_t blkno = start;
 120         struct f2fs_io_info fio = {
 121                 .type = META,
 122                 .rw = READ_SYNC | REQ_META | REQ_PRIO
 123         };
 124
 125         for (; nrpages-- > 0; blkno++) {
 126
 127                 if (!is_valid_blkaddr(sbi, blkno, type))
 128                         goto out;
 129
 130                 switch (type) {
 131                 case META_NAT:
 132                         if (unlikely(blkno >=
 133                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 134                                 blkno = 0;
 135                         /* get nat block addr */
 136                         fio.blk_addr = current_nat_addr(sbi,
 137                                         blkno * NAT_ENTRY_PER_BLOCK);
 138                         break;
 139                 case META_SIT:
 140                         /* get sit block addr */
 141                         fio.blk_addr = current_sit_addr(sbi,
 142                                         blkno * SIT_ENTRY_PER_BLOCK);
 143                         if (blkno != start && prev_blk_addr + 1 != fio.blk_addr)
 144                                 goto out;
 145                         prev_blk_addr = fio.blk_addr;
 146                         break;
 147                 case META_SSA:
 148                 case META_CP:
 149                 case META_POR:
 150                         fio.blk_addr = blkno;
 151                         break;
 152                 default:
 153                         BUG();
 154                 }
 155
 156                 page = grab_cache_page(META_MAPPING(sbi), fio.blk_addr);
 157                 if (!page)
 158                         continue;
 159                 if (PageUptodate(page)) {
 160                         f2fs_put_page(page, 1);
 161                         continue;
 162                 }
 163
 164                 f2fs_submit_page_mbio(sbi, page, &fio);
 165                 f2fs_put_page(page, 0);
 166         }
 167 out:
 168         f2fs_submit_merged_bio(sbi, META, READ);
 169         return blkno - start;
 170 }
 171
 172 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 173 {
 174         struct page *page;
 175         bool readahead = false;
 176
 177         page = find_get_page(META_MAPPING(sbi), index);
 178         if (!page || (page && !PageUptodate(page)))
 179                 readahead = true;
 180         f2fs_put_page(page, 0);
 181
 182         if (readahead)
 183                 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR);
 184 }
 185
 186 static int f2fs_write_meta_page(struct page *page,
 187                                 struct writeback_control *wbc)
 188 {
 189         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 190
 191         trace_f2fs_writepage(page, META);
 192
 193         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 194                 goto redirty_out;
 195         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 196                 goto redirty_out;
 197         if (unlikely(f2fs_cp_error(sbi)))
 198                 goto redirty_out;
 199
 200         f2fs_wait_on_page_writeback(page, META);
 201         write_meta_page(sbi, page);
 202         dec_page_count(sbi, F2FS_DIRTY_META);
 203         unlock_page(page);
 204
 205         if (wbc->for_reclaim)
 206                 f2fs_submit_merged_bio(sbi, META, WRITE);
 207         return 0;
 208
 209 redirty_out:
 210         redirty_page_for_writepage(wbc, page);
 211         return AOP_WRITEPAGE_ACTIVATE;
 212 }
 213
 214 static int f2fs_write_meta_pages(struct address_space *mapping,
 215                                 struct writeback_control *wbc)
 216 {
 217         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 218         long diff, written;
 219
 220         trace_f2fs_writepages(mapping->host, wbc, META);
 221
 222         /* collect a number of dirty meta pages and write together */
 223         if (wbc->for_kupdate ||
 224                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 225                 goto skip_write;
 226
 227         /* if mounting is failed, skip writing node pages */
 228         mutex_lock(&sbi->cp_mutex);
 229         diff = nr_pages_to_write(sbi, META, wbc);
 230         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 231         mutex_unlock(&sbi->cp_mutex);
 232         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 233         return 0;
 234
 235 skip_write:
 236         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 237         return 0;
 238 }
 239
 240 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 241                                                 long nr_to_write)
 242 {
 243         struct address_space *mapping = META_MAPPING(sbi);
 244         pgoff_t index = 0, end = LONG_MAX;
 245         struct pagevec pvec;
 246         long nwritten = 0;
 247         struct writeback_control wbc = {
 248                 .for_reclaim = 0,
 249         };
 250
 251         pagevec_init(&pvec, 0);
 252
 253         while (index <= end) {
 254                 int i, nr_pages;
 255                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 256                                 PAGECACHE_TAG_DIRTY,
 257                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 258                 if (unlikely(nr_pages == 0))
 259                         break;
 260
 261                 for (i = 0; i < nr_pages; i++) {
 262                         struct page *page = pvec.pages[i];
 263
 264                         lock_page(page);
 265
 266                         if (unlikely(page->mapping != mapping)) {
 267 continue_unlock:
 268                                 unlock_page(page);
 269                                 continue;
 270                         }
 271                         if (!PageDirty(page)) {
 272                                 /* someone wrote it for us */
 273                                 goto continue_unlock;
 274                         }
 275
 276                         if (!clear_page_dirty_for_io(page))
 277                                 goto continue_unlock;
 278
 279                         if (f2fs_write_meta_page(page, &wbc)) {
 280                                 unlock_page(page);
 281                                 break;
 282                         }
 283                         nwritten++;
 284                         if (unlikely(nwritten >= nr_to_write))
 285                                 break;
 286                 }
 287                 pagevec_release(&pvec);
 288                 cond_resched();
 289         }
 290
 291         if (nwritten)
 292                 f2fs_submit_merged_bio(sbi, type, WRITE);
 293
 294         return nwritten;
 295 }
 296
 297 static int f2fs_set_meta_page_dirty(struct page *page)
 298 {
 299         trace_f2fs_set_page_dirty(page, META);
 300
 301         SetPageUptodate(page);
 302         if (!PageDirty(page)) {
 303                 __set_page_dirty_nobuffers(page);
 304                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 305                 SetPagePrivate(page);
 306                 f2fs_trace_pid(page);
 307                 return 1;
 308         }
 309         return 0;
 310 }
 311
 312 const struct address_space_operations f2fs_meta_aops = {
 313         .writepage      = f2fs_write_meta_page,
 314         .writepages     = f2fs_write_meta_pages,
 315         .set_page_dirty = f2fs_set_meta_page_dirty,
 316         .invalidatepage = f2fs_invalidate_page,
 317         .releasepage    = f2fs_release_page,
 318 };
 319
 320 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 321 {
 322         struct inode_management *im = &sbi->im[type];
 323         struct ino_entry *e;
 324 retry:
 325         if (radix_tree_preload(GFP_NOFS)) {
 326                 cond_resched();
 327                 goto retry;
 328         }
 329
 330         spin_lock(&im->ino_lock);
 331
 332         e = radix_tree_lookup(&im->ino_root, ino);
 333         if (!e) {
 334                 e = kmem_cache_alloc(ino_entry_slab, GFP_ATOMIC);
 335                 if (!e) {
 336                         spin_unlock(&im->ino_lock);
 337                         radix_tree_preload_end();
 338                         goto retry;
 339                 }
 340                 if (radix_tree_insert(&im->ino_root, ino, e)) {
 341                         spin_unlock(&im->ino_lock);
 342                         kmem_cache_free(ino_entry_slab, e);
 343                         radix_tree_preload_end();
 344                         goto retry;
 345                 }
 346                 memset(e, 0, sizeof(struct ino_entry));
 347                 e->ino = ino;
 348
 349                 list_add_tail(&e->list, &im->ino_list);
 350                 if (type != ORPHAN_INO)
 351                         im->ino_num++;
 352         }
 353         spin_unlock(&im->ino_lock);
 354         radix_tree_preload_end();
 355 }
 356
 357 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 358 {
 359         struct inode_management *im = &sbi->im[type];
 360         struct ino_entry *e;
 361
 362         spin_lock(&im->ino_lock);
 363         e = radix_tree_lookup(&im->ino_root, ino);
 364         if (e) {
 365                 list_del(&e->list);
 366                 radix_tree_delete(&im->ino_root, ino);
 367                 im->ino_num--;
 368                 spin_unlock(&im->ino_lock);
 369                 kmem_cache_free(ino_entry_slab, e);
 370                 return;
 371         }
 372         spin_unlock(&im->ino_lock);
 373 }
 374
 375 void add_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 376 {
 377         /* add new dirty ino entry into list */
 378         __add_ino_entry(sbi, ino, type);
 379 }
 380
 381 void remove_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 382 {
 383         /* remove dirty ino entry from list */
 384         __remove_ino_entry(sbi, ino, type);
 385 }
 386
 387 /* mode should be APPEND_INO or UPDATE_INO */
 388 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 389 {
 390         struct inode_management *im = &sbi->im[mode];
 391         struct ino_entry *e;
 392
 393         spin_lock(&im->ino_lock);
 394         e = radix_tree_lookup(&im->ino_root, ino);
 395         spin_unlock(&im->ino_lock);
 396         return e ? true : false;
 397 }
 398
 399 void release_dirty_inode(struct f2fs_sb_info *sbi)
 400 {
 401         struct ino_entry *e, *tmp;
 402         int i;
 403
 404         for (i = APPEND_INO; i <= UPDATE_INO; i++) {
 405                 struct inode_management *im = &sbi->im[i];
 406
 407                 spin_lock(&im->ino_lock);
 408                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 409                         list_del(&e->list);
 410                         radix_tree_delete(&im->ino_root, e->ino);
 411                         kmem_cache_free(ino_entry_slab, e);
 412                         im->ino_num--;
 413                 }
 414                 spin_unlock(&im->ino_lock);
 415         }
 416 }
 417
 418 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 419 {
 420         struct inode_management *im = &sbi->im[ORPHAN_INO];
 421         int err = 0;
 422
 423         spin_lock(&im->ino_lock);
 424         if (unlikely(im->ino_num >= sbi->max_orphans))
 425                 err = -ENOSPC;
 426         else
 427                 im->ino_num++;
 428         spin_unlock(&im->ino_lock);
 429
 430         return err;
 431 }
 432
 433 void release_orphan_inode(struct f2fs_sb_info *sbi)
 434 {
 435         struct inode_management *im = &sbi->im[ORPHAN_INO];
 436
 437         spin_lock(&im->ino_lock);
 438         f2fs_bug_on(sbi, im->ino_num == 0);
 439         im->ino_num--;
 440         spin_unlock(&im->ino_lock);
 441 }
 442
 443 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 444 {
 445         /* add new orphan ino entry into list */
 446         __add_ino_entry(sbi, ino, ORPHAN_INO);
 447 }
 448
 449 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 450 {
 451         /* remove orphan entry from orphan list */
 452         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 453 }
 454
 455 static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 456 {
 457         struct inode *inode = f2fs_iget(sbi->sb, ino);
 458         f2fs_bug_on(sbi, IS_ERR(inode));
 459         clear_nlink(inode);
 460
 461         /* truncate all the data during iput */
 462         iput(inode);
 463 }
 464
 465 void recover_orphan_inodes(struct f2fs_sb_info *sbi)
 466 {
 467         block_t start_blk, orphan_blkaddr, i, j;
 468
 469         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
 470                 return;
 471
 472         set_sbi_flag(sbi, SBI_POR_DOING);
 473
 474         start_blk = __start_cp_addr(sbi) + 1 +
 475                 le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
 476         orphan_blkaddr = __start_sum_addr(sbi) - 1;
 477
 478         ra_meta_pages(sbi, start_blk, orphan_blkaddr, META_CP);
 479
 480         for (i = 0; i < orphan_blkaddr; i++) {
 481                 struct page *page = get_meta_page(sbi, start_blk + i);
 482                 struct f2fs_orphan_block *orphan_blk;
 483
 484                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 485                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 486                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 487                         recover_orphan_inode(sbi, ino);
 488                 }
 489                 f2fs_put_page(page, 1);
 490         }
 491         /* clear Orphan Flag */
 492         clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
 493         clear_sbi_flag(sbi, SBI_POR_DOING);
 494         return;
 495 }
 496
 497 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 498 {
 499         struct list_head *head;
 500         struct f2fs_orphan_block *orphan_blk = NULL;
 501         unsigned int nentries = 0;
 502         unsigned short index;
 503         unsigned short orphan_blocks;
 504         struct page *page = NULL;
 505         struct ino_entry *orphan = NULL;
 506         struct inode_management *im = &sbi->im[ORPHAN_INO];
 507
 508         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 509
 510         for (index = 0; index < orphan_blocks; index++)
 511                 grab_meta_page(sbi, start_blk + index);
 512
 513         index = 1;
 514         spin_lock(&im->ino_lock);
 515         head = &im->ino_list;
 516
 517         /* loop for each orphan inode entry and write them in Jornal block */
 518         list_for_each_entry(orphan, head, list) {
 519                 if (!page) {
 520                         page = find_get_page(META_MAPPING(sbi), start_blk++);
 521                         f2fs_bug_on(sbi, !page);
 522                         orphan_blk =
 523                                 (struct f2fs_orphan_block *)page_address(page);
 524                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 525                         f2fs_put_page(page, 0);
 526                 }
 527
 528                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 529
 530                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 531                         /*
 532                          * an orphan block is full of 1020 entries,
 533                          * then we need to flush current orphan blocks
 534                          * and bring another one in memory
 535                          */
 536                         orphan_blk->blk_addr = cpu_to_le16(index);
 537                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 538                         orphan_blk->entry_count = cpu_to_le32(nentries);
 539                         set_page_dirty(page);
 540                         f2fs_put_page(page, 1);
 541                         index++;
 542                         nentries = 0;
 543                         page = NULL;
 544                 }
 545         }
 546
 547         if (page) {
 548                 orphan_blk->blk_addr = cpu_to_le16(index);
 549                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 550                 orphan_blk->entry_count = cpu_to_le32(nentries);
 551                 set_page_dirty(page);
 552                 f2fs_put_page(page, 1);
 553         }
 554
 555         spin_unlock(&im->ino_lock);
 556 }
 557
 558 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 559                                 block_t cp_addr, unsigned long long *version)
 560 {
 561         struct page *cp_page_1, *cp_page_2 = NULL;
 562         unsigned long blk_size = sbi->blocksize;
 563         struct f2fs_checkpoint *cp_block;
 564         unsigned long long cur_version = 0, pre_version = 0;
 565         size_t crc_offset;
 566         __u32 crc = 0;
 567
 568         /* Read the 1st cp block in this CP pack */
 569         cp_page_1 = get_meta_page(sbi, cp_addr);
 570
 571         /* get the version number */
 572         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
 573         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 574         if (crc_offset >= blk_size)
 575                 goto invalid_cp1;
 576
 577         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 578         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 579                 goto invalid_cp1;
 580
 581         pre_version = cur_cp_version(cp_block);
 582
 583         /* Read the 2nd cp block in this CP pack */
 584         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 585         cp_page_2 = get_meta_page(sbi, cp_addr);
 586
 587         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
 588         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 589         if (crc_offset >= blk_size)
 590                 goto invalid_cp2;
 591
 592         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 593         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 594                 goto invalid_cp2;
 595
 596         cur_version = cur_cp_version(cp_block);
 597
 598         if (cur_version == pre_version) {
 599                 *version = cur_version;
 600                 f2fs_put_page(cp_page_2, 1);
 601                 return cp_page_1;
 602         }
 603 invalid_cp2:
 604         f2fs_put_page(cp_page_2, 1);
 605 invalid_cp1:
 606         f2fs_put_page(cp_page_1, 1);
 607         return NULL;
 608 }
 609
 610 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 611 {
 612         struct f2fs_checkpoint *cp_block;
 613         struct f2fs_super_block *fsb = sbi->raw_super;
 614         struct page *cp1, *cp2, *cur_page;
 615         unsigned long blk_size = sbi->blocksize;
 616         unsigned long long cp1_version = 0, cp2_version = 0;
 617         unsigned long long cp_start_blk_no;
 618         unsigned int cp_blks = 1 + le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
 619         block_t cp_blk_no;
 620         int i;
 621
 622         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 623         if (!sbi->ckpt)
 624                 return -ENOMEM;
 625         /*
 626          * Finding out valid cp block involves read both
 627          * sets( cp pack1 and cp pack 2)
 628          */
 629         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 630         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 631
 632         /* The second checkpoint pack should start at the next segment */
 633         cp_start_blk_no += ((unsigned long long)1) <<
 634                                 le32_to_cpu(fsb->log_blocks_per_seg);
 635         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 636
 637         if (cp1 && cp2) {
 638                 if (ver_after(cp2_version, cp1_version))
 639                         cur_page = cp2;
 640                 else
 641                         cur_page = cp1;
 642         } else if (cp1) {
 643                 cur_page = cp1;
 644         } else if (cp2) {
 645                 cur_page = cp2;
 646         } else {
 647                 goto fail_no_cp;
 648         }
 649
 650         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 651         memcpy(sbi->ckpt, cp_block, blk_size);
 652
 653         if (cp_blks <= 1)
 654                 goto done;
 655
 656         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 657         if (cur_page == cp2)
 658                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 659
 660         for (i = 1; i < cp_blks; i++) {
 661                 void *sit_bitmap_ptr;
 662                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 663
 664                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 665                 sit_bitmap_ptr = page_address(cur_page);
 666                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 667                 f2fs_put_page(cur_page, 1);
 668         }
 669 done:
 670         f2fs_put_page(cp1, 1);
 671         f2fs_put_page(cp2, 1);
 672         return 0;
 673
 674 fail_no_cp:
 675         kfree(sbi->ckpt);
 676         return -EINVAL;
 677 }
 678
 679 static int __add_dirty_inode(struct inode *inode, struct inode_entry *new)
 680 {
 681         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 682
 683         if (is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR))
 684                 return -EEXIST;
 685
 686         set_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 687         F2FS_I(inode)->dirty_dir = new;
 688         list_add_tail(&new->list, &sbi->dir_inode_list);
 689         stat_inc_dirty_dir(sbi);
 690         return 0;
 691 }
 692
 693 void update_dirty_page(struct inode *inode, struct page *page)
 694 {
 695         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 696         struct inode_entry *new;
 697         int ret = 0;
 698
 699         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode))
 700                 return;
 701
 702         if (!S_ISDIR(inode->i_mode)) {
 703                 inode_inc_dirty_pages(inode);
 704                 goto out;
 705         }
 706
 707         new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 708         new->inode = inode;
 709         INIT_LIST_HEAD(&new->list);
 710
 711         spin_lock(&sbi->dir_inode_lock);
 712         ret = __add_dirty_inode(inode, new);
 713         inode_inc_dirty_pages(inode);
 714         spin_unlock(&sbi->dir_inode_lock);
 715
 716         if (ret)
 717                 kmem_cache_free(inode_entry_slab, new);
 718 out:
 719         SetPagePrivate(page);
 720         f2fs_trace_pid(page);
 721 }
 722
 723 void add_dirty_dir_inode(struct inode *inode)
 724 {
 725         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 726         struct inode_entry *new =
 727                         f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 728         int ret = 0;
 729
 730         new->inode = inode;
 731         INIT_LIST_HEAD(&new->list);
 732
 733         spin_lock(&sbi->dir_inode_lock);
 734         ret = __add_dirty_inode(inode, new);
 735         spin_unlock(&sbi->dir_inode_lock);
 736
 737         if (ret)
 738                 kmem_cache_free(inode_entry_slab, new);
 739 }
 740
 741 void remove_dirty_dir_inode(struct inode *inode)
 742 {
 743         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 744         struct inode_entry *entry;
 745
 746         if (!S_ISDIR(inode->i_mode))
 747                 return;
 748
 749         spin_lock(&sbi->dir_inode_lock);
 750         if (get_dirty_pages(inode) ||
 751                         !is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR)) {
 752                 spin_unlock(&sbi->dir_inode_lock);
 753                 return;
 754         }
 755
 756         entry = F2FS_I(inode)->dirty_dir;
 757         list_del(&entry->list);
 758         F2FS_I(inode)->dirty_dir = NULL;
 759         clear_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 760         stat_dec_dirty_dir(sbi);
 761         spin_unlock(&sbi->dir_inode_lock);
 762         kmem_cache_free(inode_entry_slab, entry);
 763
 764         /* Only from the recovery routine */
 765         if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) {
 766                 clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT);
 767                 iput(inode);
 768         }
 769 }
 770
 771 void sync_dirty_dir_inodes(struct f2fs_sb_info *sbi)
 772 {
 773         struct list_head *head;
 774         struct inode_entry *entry;
 775         struct inode *inode;
 776 retry:
 777         if (unlikely(f2fs_cp_error(sbi)))
 778                 return;
 779
 780         spin_lock(&sbi->dir_inode_lock);
 781
 782         head = &sbi->dir_inode_list;
 783         if (list_empty(head)) {
 784                 spin_unlock(&sbi->dir_inode_lock);
 785                 return;
 786         }
 787         entry = list_entry(head->next, struct inode_entry, list);
 788         inode = igrab(entry->inode);
 789         spin_unlock(&sbi->dir_inode_lock);
 790         if (inode) {
 791                 filemap_fdatawrite(inode->i_mapping);
 792                 iput(inode);
 793         } else {
 794                 /*
 795                  * We should submit bio, since it exists several
 796                  * wribacking dentry pages in the freeing inode.
 797                  */
 798                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 799         }
 800         goto retry;
 801 }
 802
 803 /*
 804  * Freeze all the FS-operations for checkpoint.
 805  */
 806 static int block_operations(struct f2fs_sb_info *sbi)
 807 {
 808         struct writeback_control wbc = {
 809                 .sync_mode = WB_SYNC_ALL,
 810                 .nr_to_write = LONG_MAX,
 811                 .for_reclaim = 0,
 812         };
 813         struct blk_plug plug;
 814         int err = 0;
 815
 816         blk_start_plug(&plug);
 817
 818 retry_flush_dents:
 819         f2fs_lock_all(sbi);
 820         /* write all the dirty dentry pages */
 821         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 822                 f2fs_unlock_all(sbi);
 823                 sync_dirty_dir_inodes(sbi);
 824                 if (unlikely(f2fs_cp_error(sbi))) {
 825                         err = -EIO;
 826                         goto out;
 827                 }
 828                 goto retry_flush_dents;
 829         }
 830
 831         /*
 832          * POR: we should ensure that there are no dirty node pages
 833          * until finishing nat/sit flush.
 834          */
 835 retry_flush_nodes:
 836         down_write(&sbi->node_write);
 837
 838         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
 839                 up_write(&sbi->node_write);
 840                 sync_node_pages(sbi, 0, &wbc);
 841                 if (unlikely(f2fs_cp_error(sbi))) {
 842                         f2fs_unlock_all(sbi);
 843                         err = -EIO;
 844                         goto out;
 845                 }
 846                 goto retry_flush_nodes;
 847         }
 848 out:
 849         blk_finish_plug(&plug);
 850         return err;
 851 }
 852
 853 static void unblock_operations(struct f2fs_sb_info *sbi)
 854 {
 855         up_write(&sbi->node_write);
 856         f2fs_unlock_all(sbi);
 857 }
 858
 859 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
 860 {
 861         DEFINE_WAIT(wait);
 862
 863         for (;;) {
 864                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
 865
 866                 if (!get_pages(sbi, F2FS_WRITEBACK))
 867                         break;
 868
 869                 io_schedule();
 870         }
 871         finish_wait(&sbi->cp_wait, &wait);
 872 }
 873
 874 static void do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 875 {
 876         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 877         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 878         struct f2fs_nm_info *nm_i = NM_I(sbi);
 879         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
 880         nid_t last_nid = nm_i->next_scan_nid;
 881         block_t start_blk;
 882         struct page *cp_page;
 883         unsigned int data_sum_blocks, orphan_blocks;
 884         __u32 crc32 = 0;
 885         void *kaddr;
 886         int i;
 887         int cp_payload_blks = le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
 888
 889         /*
 890          * This avoids to conduct wrong roll-forward operations and uses
 891          * metapages, so should be called prior to sync_meta_pages below.
 892          */
 893         discard_next_dnode(sbi, NEXT_FREE_BLKADDR(sbi, curseg));
 894
 895         /* Flush all the NAT/SIT pages */
 896         while (get_pages(sbi, F2FS_DIRTY_META)) {
 897                 sync_meta_pages(sbi, META, LONG_MAX);
 898                 if (unlikely(f2fs_cp_error(sbi)))
 899                         return;
 900         }
 901
 902         next_free_nid(sbi, &last_nid);
 903
 904         /*
 905          * modify checkpoint
 906          * version number is already updated
 907          */
 908         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
 909         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
 910         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
 911         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
 912                 ckpt->cur_node_segno[i] =
 913                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
 914                 ckpt->cur_node_blkoff[i] =
 915                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
 916                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
 917                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
 918         }
 919         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
 920                 ckpt->cur_data_segno[i] =
 921                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
 922                 ckpt->cur_data_blkoff[i] =
 923                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
 924                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
 925                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
 926         }
 927
 928         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
 929         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
 930         ckpt->next_free_nid = cpu_to_le32(last_nid);
 931
 932         /* 2 cp  + n data seg summary + orphan inode blocks */
 933         data_sum_blocks = npages_for_summary_flush(sbi, false);
 934         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
 935                 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 936         else
 937                 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 938
 939         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
 940         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
 941                         orphan_blocks);
 942
 943         if (__remain_node_summaries(cpc->reason))
 944                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
 945                                 cp_payload_blks + data_sum_blocks +
 946                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
 947         else
 948                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
 949                                 cp_payload_blks + data_sum_blocks +
 950                                 orphan_blocks);
 951
 952         if (cpc->reason == CP_UMOUNT)
 953                 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 954         else
 955                 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 956
 957         if (cpc->reason == CP_FASTBOOT)
 958                 set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
 959         else
 960                 clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
 961
 962         if (orphan_num)
 963                 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 964         else
 965                 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 966
 967         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
 968                 set_ckpt_flags(ckpt, CP_FSCK_FLAG);
 969
 970         /* update SIT/NAT bitmap */
 971         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
 972         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
 973
 974         crc32 = f2fs_crc32(ckpt, le32_to_cpu(ckpt->checksum_offset));
 975         *((__le32 *)((unsigned char *)ckpt +
 976                                 le32_to_cpu(ckpt->checksum_offset)))
 977                                 = cpu_to_le32(crc32);
 978
 979         start_blk = __start_cp_addr(sbi);
 980
 981         /* write out checkpoint buffer at block 0 */
 982         cp_page = grab_meta_page(sbi, start_blk++);
 983         kaddr = page_address(cp_page);
 984         memcpy(kaddr, ckpt, F2FS_BLKSIZE);
 985         set_page_dirty(cp_page);
 986         f2fs_put_page(cp_page, 1);
 987
 988         for (i = 1; i < 1 + cp_payload_blks; i++) {
 989                 cp_page = grab_meta_page(sbi, start_blk++);
 990                 kaddr = page_address(cp_page);
 991                 memcpy(kaddr, (char *)ckpt + i * F2FS_BLKSIZE, F2FS_BLKSIZE);
 992                 set_page_dirty(cp_page);
 993                 f2fs_put_page(cp_page, 1);
 994         }
 995
 996         if (orphan_num) {
 997                 write_orphan_inodes(sbi, start_blk);
 998                 start_blk += orphan_blocks;
 999         }
1000
1001         write_data_summaries(sbi, start_blk);
1002         start_blk += data_sum_blocks;
1003         if (__remain_node_summaries(cpc->reason)) {
1004                 write_node_summaries(sbi, start_blk);
1005                 start_blk += NR_CURSEG_NODE_TYPE;
1006         }
1007
1008         /* writeout checkpoint block */
1009         cp_page = grab_meta_page(sbi, start_blk);
1010         kaddr = page_address(cp_page);
1011         memcpy(kaddr, ckpt, F2FS_BLKSIZE);
1012         set_page_dirty(cp_page);
1013         f2fs_put_page(cp_page, 1);
1014
1015         /* wait for previous submitted node/meta pages writeback */
1016         wait_on_all_pages_writeback(sbi);
1017
1018         if (unlikely(f2fs_cp_error(sbi)))
1019                 return;
1020
1021         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LONG_MAX);
1022         filemap_fdatawait_range(META_MAPPING(sbi), 0, LONG_MAX);
1023
1024         /* update user_block_counts */
1025         sbi->last_valid_block_count = sbi->total_valid_block_count;
1026         sbi->alloc_valid_block_count = 0;
1027
1028         /* Here, we only have one bio having CP pack */
1029         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
1030
1031         /* wait for previous submitted meta pages writeback */
1032         wait_on_all_pages_writeback(sbi);
1033
1034         release_dirty_inode(sbi);
1035
1036         if (unlikely(f2fs_cp_error(sbi)))
1037                 return;
1038
1039         clear_prefree_segments(sbi);
1040         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1041 }
1042
1043 /*
1044  * We guarantee that this checkpoint procedure will not fail.
1045  */
1046 void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1047 {
1048         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1049         unsigned long long ckpt_ver;
1050
1051         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1052
1053         mutex_lock(&sbi->cp_mutex);
1054
1055         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1056                         cpc->reason != CP_DISCARD && cpc->reason != CP_UMOUNT)
1057                 goto out;
1058         if (unlikely(f2fs_cp_error(sbi)))
1059                 goto out;
1060         if (f2fs_readonly(sbi->sb))
1061                 goto out;
1062         if (block_operations(sbi))
1063                 goto out;
1064
1065         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1066
1067         f2fs_submit_merged_bio(sbi, DATA, WRITE);
1068         f2fs_submit_merged_bio(sbi, NODE, WRITE);
1069         f2fs_submit_merged_bio(sbi, META, WRITE);
1070
1071         /*
1072          * update checkpoint pack index
1073          * Increase the version number so that
1074          * SIT entries and seg summaries are written at correct place
1075          */
1076         ckpt_ver = cur_cp_version(ckpt);
1077         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1078
1079         /* write cached NAT/SIT entries to NAT/SIT area */
1080         flush_nat_entries(sbi);
1081         flush_sit_entries(sbi, cpc);
1082
1083         /* unlock all the fs_lock[] in do_checkpoint() */
1084         do_checkpoint(sbi, cpc);
1085
1086         unblock_operations(sbi);
1087         stat_inc_cp_count(sbi->stat_info);
1088 out:
1089         mutex_unlock(&sbi->cp_mutex);
1090         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1091 }
1092
1093 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1094 {
1095         int i;
1096
1097         for (i = 0; i < MAX_INO_ENTRY; i++) {
1098                 struct inode_management *im = &sbi->im[i];
1099
1100                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1101                 spin_lock_init(&im->ino_lock);
1102                 INIT_LIST_HEAD(&im->ino_list);
1103                 im->ino_num = 0;
1104         }
1105
1106         /*
1107          * considering 512 blocks in a segment 8 blocks are needed for cp
1108          * and log segment summaries. Remaining blocks are used to keep
1109          * orphan entries with the limitation one reserved segment
1110          * for cp pack we can have max 1020*504 orphan entries
1111          */
1112         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1113                         NR_CURSEG_TYPE) * F2FS_ORPHANS_PER_BLOCK;
1114 }
1115
1116 int __init create_checkpoint_caches(void)
1117 {
1118         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1119                         sizeof(struct ino_entry));
1120         if (!ino_entry_slab)
1121                 return -ENOMEM;
1122         inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1123                         sizeof(struct inode_entry));
1124         if (!inode_entry_slab) {
1125                 kmem_cache_destroy(ino_entry_slab);
1126                 return -ENOMEM;
1127         }
1128         return 0;
1129 }
1130
1131 void destroy_checkpoint_caches(void)
1132 {
1133         kmem_cache_destroy(ino_entry_slab);
1134         kmem_cache_destroy(inode_entry_slab);
1135 }