fs/f2fs/checkpoint.c

   1 /*
   2  * fs/f2fs/checkpoint.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/bio.h>
  13 #include <linux/mpage.h>
  14 #include <linux/writeback.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/f2fs_fs.h>
  17 #include <linux/pagevec.h>
  18 #include <linux/swap.h>
  19
  20 #include "f2fs.h"
  21 #include "node.h"
  22 #include "segment.h"
  23 #include "trace.h"
  24 #include <trace/events/f2fs.h>
  25
  26 static struct kmem_cache *ino_entry_slab;
  27 struct kmem_cache *inode_entry_slab;
  28
  29 /*
  30  * We guarantee no failure on the returned page.
  31  */
  32 struct page *grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  33 {
  34         struct address_space *mapping = META_MAPPING(sbi);
  35         struct page *page = NULL;
  36 repeat:
  37         page = grab_cache_page(mapping, index);
  38         if (!page) {
  39                 cond_resched();
  40                 goto repeat;
  41         }
  42         f2fs_wait_on_page_writeback(page, META);
  43         SetPageUptodate(page);
  44         return page;
  45 }
  46
  47 /*
  48  * We guarantee no failure on the returned page.
  49  */
  50 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  51 {
  52         struct address_space *mapping = META_MAPPING(sbi);
  53         struct page *page;
  54         struct f2fs_io_info fio = {
  55                 .sbi = sbi,
  56                 .type = META,
  57                 .rw = READ_SYNC | REQ_META | REQ_PRIO,
  58                 .blk_addr = index,
  59                 .encrypted_page = NULL,
  60         };
  61 repeat:
  62         page = grab_cache_page(mapping, index);
  63         if (!page) {
  64                 cond_resched();
  65                 goto repeat;
  66         }
  67         if (PageUptodate(page))
  68                 goto out;
  69
  70         fio.page = page;
  71
  72         if (f2fs_submit_page_bio(&fio)) {
  73                 f2fs_put_page(page, 1);
  74                 goto repeat;
  75         }
  76
  77         lock_page(page);
  78         if (unlikely(page->mapping != mapping)) {
  79                 f2fs_put_page(page, 1);
  80                 goto repeat;
  81         }
  82
  83         /*
  84          * if there is any IO error when accessing device, make our filesystem
  85          * readonly and make sure do not write checkpoint with non-uptodate
  86          * meta page.
  87          */
  88         if (unlikely(!PageUptodate(page)))
  89                 f2fs_stop_checkpoint(sbi);
  90 out:
  91         return page;
  92 }
  93
  94 bool is_valid_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type)
  95 {
  96         switch (type) {
  97         case META_NAT:
  98                 break;
  99         case META_SIT:
 100                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 101                         return false;
 102                 break;
 103         case META_SSA:
 104                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 105                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 106                         return false;
 107                 break;
 108         case META_CP:
 109                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 110                         blkaddr < __start_cp_addr(sbi)))
 111                         return false;
 112                 break;
 113         case META_POR:
 114                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 115                         blkaddr < MAIN_BLKADDR(sbi)))
 116                         return false;
 117                 break;
 118         default:
 119                 BUG();
 120         }
 121
 122         return true;
 123 }
 124
 125 /*
 126  * Readahead CP/NAT/SIT/SSA pages
 127  */
 128 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, int type)
 129 {
 130         block_t prev_blk_addr = 0;
 131         struct page *page;
 132         block_t blkno = start;
 133         struct f2fs_io_info fio = {
 134                 .sbi = sbi,
 135                 .type = META,
 136                 .rw = READ_SYNC | REQ_META | REQ_PRIO,
 137                 .encrypted_page = NULL,
 138         };
 139
 140         for (; nrpages-- > 0; blkno++) {
 141
 142                 if (!is_valid_blkaddr(sbi, blkno, type))
 143                         goto out;
 144
 145                 switch (type) {
 146                 case META_NAT:
 147                         if (unlikely(blkno >=
 148                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 149                                 blkno = 0;
 150                         /* get nat block addr */
 151                         fio.blk_addr = current_nat_addr(sbi,
 152                                         blkno * NAT_ENTRY_PER_BLOCK);
 153                         break;
 154                 case META_SIT:
 155                         /* get sit block addr */
 156                         fio.blk_addr = current_sit_addr(sbi,
 157                                         blkno * SIT_ENTRY_PER_BLOCK);
 158                         if (blkno != start && prev_blk_addr + 1 != fio.blk_addr)
 159                                 goto out;
 160                         prev_blk_addr = fio.blk_addr;
 161                         break;
 162                 case META_SSA:
 163                 case META_CP:
 164                 case META_POR:
 165                         fio.blk_addr = blkno;
 166                         break;
 167                 default:
 168                         BUG();
 169                 }
 170
 171                 page = grab_cache_page(META_MAPPING(sbi), fio.blk_addr);
 172                 if (!page)
 173                         continue;
 174                 if (PageUptodate(page)) {
 175                         f2fs_put_page(page, 1);
 176                         continue;
 177                 }
 178
 179                 fio.page = page;
 180                 f2fs_submit_page_mbio(&fio);
 181                 f2fs_put_page(page, 0);
 182         }
 183 out:
 184         f2fs_submit_merged_bio(sbi, META, READ);
 185         return blkno - start;
 186 }
 187
 188 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 189 {
 190         struct page *page;
 191         bool readahead = false;
 192
 193         page = find_get_page(META_MAPPING(sbi), index);
 194         if (!page || (page && !PageUptodate(page)))
 195                 readahead = true;
 196         f2fs_put_page(page, 0);
 197
 198         if (readahead)
 199                 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR);
 200 }
 201
 202 static int f2fs_write_meta_page(struct page *page,
 203                                 struct writeback_control *wbc)
 204 {
 205         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 206
 207         trace_f2fs_writepage(page, META);
 208
 209         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 210                 goto redirty_out;
 211         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 212                 goto redirty_out;
 213         if (unlikely(f2fs_cp_error(sbi)))
 214                 goto redirty_out;
 215
 216         f2fs_wait_on_page_writeback(page, META);
 217         write_meta_page(sbi, page);
 218         dec_page_count(sbi, F2FS_DIRTY_META);
 219         unlock_page(page);
 220
 221         if (wbc->for_reclaim)
 222                 f2fs_submit_merged_bio(sbi, META, WRITE);
 223         return 0;
 224
 225 redirty_out:
 226         redirty_page_for_writepage(wbc, page);
 227         return AOP_WRITEPAGE_ACTIVATE;
 228 }
 229
 230 static int f2fs_write_meta_pages(struct address_space *mapping,
 231                                 struct writeback_control *wbc)
 232 {
 233         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 234         long diff, written;
 235
 236         trace_f2fs_writepages(mapping->host, wbc, META);
 237
 238         /* collect a number of dirty meta pages and write together */
 239         if (wbc->for_kupdate ||
 240                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 241                 goto skip_write;
 242
 243         /* if mounting is failed, skip writing node pages */
 244         mutex_lock(&sbi->cp_mutex);
 245         diff = nr_pages_to_write(sbi, META, wbc);
 246         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 247         mutex_unlock(&sbi->cp_mutex);
 248         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 249         return 0;
 250
 251 skip_write:
 252         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 253         return 0;
 254 }
 255
 256 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 257                                                 long nr_to_write)
 258 {
 259         struct address_space *mapping = META_MAPPING(sbi);
 260         pgoff_t index = 0, end = LONG_MAX;
 261         struct pagevec pvec;
 262         long nwritten = 0;
 263         struct writeback_control wbc = {
 264                 .for_reclaim = 0,
 265         };
 266
 267         pagevec_init(&pvec, 0);
 268
 269         while (index <= end) {
 270                 int i, nr_pages;
 271                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 272                                 PAGECACHE_TAG_DIRTY,
 273                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 274                 if (unlikely(nr_pages == 0))
 275                         break;
 276
 277                 for (i = 0; i < nr_pages; i++) {
 278                         struct page *page = pvec.pages[i];
 279
 280                         lock_page(page);
 281
 282                         if (unlikely(page->mapping != mapping)) {
 283 continue_unlock:
 284                                 unlock_page(page);
 285                                 continue;
 286                         }
 287                         if (!PageDirty(page)) {
 288                                 /* someone wrote it for us */
 289                                 goto continue_unlock;
 290                         }
 291
 292                         if (!clear_page_dirty_for_io(page))
 293                                 goto continue_unlock;
 294
 295                         if (mapping->a_ops->writepage(page, &wbc)) {
 296                                 unlock_page(page);
 297                                 break;
 298                         }
 299                         nwritten++;
 300                         if (unlikely(nwritten >= nr_to_write))
 301                                 break;
 302                 }
 303                 pagevec_release(&pvec);
 304                 cond_resched();
 305         }
 306
 307         if (nwritten)
 308                 f2fs_submit_merged_bio(sbi, type, WRITE);
 309
 310         return nwritten;
 311 }
 312
 313 static int f2fs_set_meta_page_dirty(struct page *page)
 314 {
 315         trace_f2fs_set_page_dirty(page, META);
 316
 317         SetPageUptodate(page);
 318         if (!PageDirty(page)) {
 319                 __set_page_dirty_nobuffers(page);
 320                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 321                 SetPagePrivate(page);
 322                 f2fs_trace_pid(page);
 323                 return 1;
 324         }
 325         return 0;
 326 }
 327
 328 const struct address_space_operations f2fs_meta_aops = {
 329         .writepage      = f2fs_write_meta_page,
 330         .writepages     = f2fs_write_meta_pages,
 331         .set_page_dirty = f2fs_set_meta_page_dirty,
 332         .invalidatepage = f2fs_invalidate_page,
 333         .releasepage    = f2fs_release_page,
 334 };
 335
 336 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 337 {
 338         struct inode_management *im = &sbi->im[type];
 339         struct ino_entry *e, *tmp;
 340
 341         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 342 retry:
 343         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 344
 345         spin_lock(&im->ino_lock);
 346         e = radix_tree_lookup(&im->ino_root, ino);
 347         if (!e) {
 348                 e = tmp;
 349                 if (radix_tree_insert(&im->ino_root, ino, e)) {
 350                         spin_unlock(&im->ino_lock);
 351                         radix_tree_preload_end();
 352                         goto retry;
 353                 }
 354                 memset(e, 0, sizeof(struct ino_entry));
 355                 e->ino = ino;
 356
 357                 list_add_tail(&e->list, &im->ino_list);
 358                 if (type != ORPHAN_INO)
 359                         im->ino_num++;
 360         }
 361         spin_unlock(&im->ino_lock);
 362         radix_tree_preload_end();
 363
 364         if (e != tmp)
 365                 kmem_cache_free(ino_entry_slab, tmp);
 366 }
 367
 368 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 369 {
 370         struct inode_management *im = &sbi->im[type];
 371         struct ino_entry *e;
 372
 373         spin_lock(&im->ino_lock);
 374         e = radix_tree_lookup(&im->ino_root, ino);
 375         if (e) {
 376                 list_del(&e->list);
 377                 radix_tree_delete(&im->ino_root, ino);
 378                 im->ino_num--;
 379                 spin_unlock(&im->ino_lock);
 380                 kmem_cache_free(ino_entry_slab, e);
 381                 return;
 382         }
 383         spin_unlock(&im->ino_lock);
 384 }
 385
 386 void add_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 387 {
 388         /* add new dirty ino entry into list */
 389         __add_ino_entry(sbi, ino, type);
 390 }
 391
 392 void remove_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 393 {
 394         /* remove dirty ino entry from list */
 395         __remove_ino_entry(sbi, ino, type);
 396 }
 397
 398 /* mode should be APPEND_INO or UPDATE_INO */
 399 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 400 {
 401         struct inode_management *im = &sbi->im[mode];
 402         struct ino_entry *e;
 403
 404         spin_lock(&im->ino_lock);
 405         e = radix_tree_lookup(&im->ino_root, ino);
 406         spin_unlock(&im->ino_lock);
 407         return e ? true : false;
 408 }
 409
 410 void release_dirty_inode(struct f2fs_sb_info *sbi)
 411 {
 412         struct ino_entry *e, *tmp;
 413         int i;
 414
 415         for (i = APPEND_INO; i <= UPDATE_INO; i++) {
 416                 struct inode_management *im = &sbi->im[i];
 417
 418                 spin_lock(&im->ino_lock);
 419                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 420                         list_del(&e->list);
 421                         radix_tree_delete(&im->ino_root, e->ino);
 422                         kmem_cache_free(ino_entry_slab, e);
 423                         im->ino_num--;
 424                 }
 425                 spin_unlock(&im->ino_lock);
 426         }
 427 }
 428
 429 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 430 {
 431         struct inode_management *im = &sbi->im[ORPHAN_INO];
 432         int err = 0;
 433
 434         spin_lock(&im->ino_lock);
 435         if (unlikely(im->ino_num >= sbi->max_orphans))
 436                 err = -ENOSPC;
 437         else
 438                 im->ino_num++;
 439         spin_unlock(&im->ino_lock);
 440
 441         return err;
 442 }
 443
 444 void release_orphan_inode(struct f2fs_sb_info *sbi)
 445 {
 446         struct inode_management *im = &sbi->im[ORPHAN_INO];
 447
 448         spin_lock(&im->ino_lock);
 449         f2fs_bug_on(sbi, im->ino_num == 0);
 450         im->ino_num--;
 451         spin_unlock(&im->ino_lock);
 452 }
 453
 454 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 455 {
 456         /* add new orphan ino entry into list */
 457         __add_ino_entry(sbi, ino, ORPHAN_INO);
 458 }
 459
 460 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 461 {
 462         /* remove orphan entry from orphan list */
 463         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 464 }
 465
 466 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 467 {
 468         struct inode *inode;
 469
 470         inode = f2fs_iget(sbi->sb, ino);
 471         if (IS_ERR(inode)) {
 472                 /*
 473                  * there should be a bug that we can't find the entry
 474                  * to orphan inode.
 475                  */
 476                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 477                 return PTR_ERR(inode);
 478         }
 479
 480         clear_nlink(inode);
 481
 482         /* truncate all the data during iput */
 483         iput(inode);
 484         return 0;
 485 }
 486
 487 int recover_orphan_inodes(struct f2fs_sb_info *sbi)
 488 {
 489         block_t start_blk, orphan_blocks, i, j;
 490         int err;
 491
 492         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
 493                 return 0;
 494
 495         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 496         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 497
 498         ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP);
 499
 500         for (i = 0; i < orphan_blocks; i++) {
 501                 struct page *page = get_meta_page(sbi, start_blk + i);
 502                 struct f2fs_orphan_block *orphan_blk;
 503
 504                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 505                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 506                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 507                         err = recover_orphan_inode(sbi, ino);
 508                         if (err) {
 509                                 f2fs_put_page(page, 1);
 510                                 return err;
 511                         }
 512                 }
 513                 f2fs_put_page(page, 1);
 514         }
 515         /* clear Orphan Flag */
 516         clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
 517         return 0;
 518 }
 519
 520 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 521 {
 522         struct list_head *head;
 523         struct f2fs_orphan_block *orphan_blk = NULL;
 524         unsigned int nentries = 0;
 525         unsigned short index = 1;
 526         unsigned short orphan_blocks;
 527         struct page *page = NULL;
 528         struct ino_entry *orphan = NULL;
 529         struct inode_management *im = &sbi->im[ORPHAN_INO];
 530
 531         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 532
 533         /*
 534          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 535          * orphan inode operations are covered under f2fs_lock_op().
 536          * And, spin_lock should be avoided due to page operations below.
 537          */
 538         head = &im->ino_list;
 539
 540         /* loop for each orphan inode entry and write them in Jornal block */
 541         list_for_each_entry(orphan, head, list) {
 542                 if (!page) {
 543                         page = grab_meta_page(sbi, start_blk++);
 544                         orphan_blk =
 545                                 (struct f2fs_orphan_block *)page_address(page);
 546                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 547                 }
 548
 549                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 550
 551                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 552                         /*
 553                          * an orphan block is full of 1020 entries,
 554                          * then we need to flush current orphan blocks
 555                          * and bring another one in memory
 556                          */
 557                         orphan_blk->blk_addr = cpu_to_le16(index);
 558                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 559                         orphan_blk->entry_count = cpu_to_le32(nentries);
 560                         set_page_dirty(page);
 561                         f2fs_put_page(page, 1);
 562                         index++;
 563                         nentries = 0;
 564                         page = NULL;
 565                 }
 566         }
 567
 568         if (page) {
 569                 orphan_blk->blk_addr = cpu_to_le16(index);
 570                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 571                 orphan_blk->entry_count = cpu_to_le32(nentries);
 572                 set_page_dirty(page);
 573                 f2fs_put_page(page, 1);
 574         }
 575 }
 576
 577 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 578                                 block_t cp_addr, unsigned long long *version)
 579 {
 580         struct page *cp_page_1, *cp_page_2 = NULL;
 581         unsigned long blk_size = sbi->blocksize;
 582         struct f2fs_checkpoint *cp_block;
 583         unsigned long long cur_version = 0, pre_version = 0;
 584         size_t crc_offset;
 585         __u32 crc = 0;
 586
 587         /* Read the 1st cp block in this CP pack */
 588         cp_page_1 = get_meta_page(sbi, cp_addr);
 589
 590         /* get the version number */
 591         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
 592         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 593         if (crc_offset >= blk_size)
 594                 goto invalid_cp1;
 595
 596         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 597         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 598                 goto invalid_cp1;
 599
 600         pre_version = cur_cp_version(cp_block);
 601
 602         /* Read the 2nd cp block in this CP pack */
 603         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 604         cp_page_2 = get_meta_page(sbi, cp_addr);
 605
 606         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
 607         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 608         if (crc_offset >= blk_size)
 609                 goto invalid_cp2;
 610
 611         crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset)));
 612         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 613                 goto invalid_cp2;
 614
 615         cur_version = cur_cp_version(cp_block);
 616
 617         if (cur_version == pre_version) {
 618                 *version = cur_version;
 619                 f2fs_put_page(cp_page_2, 1);
 620                 return cp_page_1;
 621         }
 622 invalid_cp2:
 623         f2fs_put_page(cp_page_2, 1);
 624 invalid_cp1:
 625         f2fs_put_page(cp_page_1, 1);
 626         return NULL;
 627 }
 628
 629 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 630 {
 631         struct f2fs_checkpoint *cp_block;
 632         struct f2fs_super_block *fsb = sbi->raw_super;
 633         struct page *cp1, *cp2, *cur_page;
 634         unsigned long blk_size = sbi->blocksize;
 635         unsigned long long cp1_version = 0, cp2_version = 0;
 636         unsigned long long cp_start_blk_no;
 637         unsigned int cp_blks = 1 + __cp_payload(sbi);
 638         block_t cp_blk_no;
 639         int i;
 640
 641         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 642         if (!sbi->ckpt)
 643                 return -ENOMEM;
 644         /*
 645          * Finding out valid cp block involves read both
 646          * sets( cp pack1 and cp pack 2)
 647          */
 648         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 649         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 650
 651         /* The second checkpoint pack should start at the next segment */
 652         cp_start_blk_no += ((unsigned long long)1) <<
 653                                 le32_to_cpu(fsb->log_blocks_per_seg);
 654         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 655
 656         if (cp1 && cp2) {
 657                 if (ver_after(cp2_version, cp1_version))
 658                         cur_page = cp2;
 659                 else
 660                         cur_page = cp1;
 661         } else if (cp1) {
 662                 cur_page = cp1;
 663         } else if (cp2) {
 664                 cur_page = cp2;
 665         } else {
 666                 goto fail_no_cp;
 667         }
 668
 669         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 670         memcpy(sbi->ckpt, cp_block, blk_size);
 671
 672         if (cp_blks <= 1)
 673                 goto done;
 674
 675         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 676         if (cur_page == cp2)
 677                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 678
 679         for (i = 1; i < cp_blks; i++) {
 680                 void *sit_bitmap_ptr;
 681                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 682
 683                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 684                 sit_bitmap_ptr = page_address(cur_page);
 685                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 686                 f2fs_put_page(cur_page, 1);
 687         }
 688 done:
 689         f2fs_put_page(cp1, 1);
 690         f2fs_put_page(cp2, 1);
 691         return 0;
 692
 693 fail_no_cp:
 694         kfree(sbi->ckpt);
 695         return -EINVAL;
 696 }
 697
 698 static int __add_dirty_inode(struct inode *inode, struct inode_entry *new)
 699 {
 700         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 701
 702         if (is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR))
 703                 return -EEXIST;
 704
 705         set_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 706         F2FS_I(inode)->dirty_dir = new;
 707         list_add_tail(&new->list, &sbi->dir_inode_list);
 708         stat_inc_dirty_dir(sbi);
 709         return 0;
 710 }
 711
 712 void update_dirty_page(struct inode *inode, struct page *page)
 713 {
 714         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 715         struct inode_entry *new;
 716         int ret = 0;
 717
 718         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 719                         !S_ISLNK(inode->i_mode))
 720                 return;
 721
 722         if (!S_ISDIR(inode->i_mode)) {
 723                 inode_inc_dirty_pages(inode);
 724                 goto out;
 725         }
 726
 727         new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 728         new->inode = inode;
 729         INIT_LIST_HEAD(&new->list);
 730
 731         spin_lock(&sbi->dir_inode_lock);
 732         ret = __add_dirty_inode(inode, new);
 733         inode_inc_dirty_pages(inode);
 734         spin_unlock(&sbi->dir_inode_lock);
 735
 736         if (ret)
 737                 kmem_cache_free(inode_entry_slab, new);
 738 out:
 739         SetPagePrivate(page);
 740         f2fs_trace_pid(page);
 741 }
 742
 743 void add_dirty_dir_inode(struct inode *inode)
 744 {
 745         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 746         struct inode_entry *new =
 747                         f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 748         int ret = 0;
 749
 750         new->inode = inode;
 751         INIT_LIST_HEAD(&new->list);
 752
 753         spin_lock(&sbi->dir_inode_lock);
 754         ret = __add_dirty_inode(inode, new);
 755         spin_unlock(&sbi->dir_inode_lock);
 756
 757         if (ret)
 758                 kmem_cache_free(inode_entry_slab, new);
 759 }
 760
 761 void remove_dirty_dir_inode(struct inode *inode)
 762 {
 763         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 764         struct inode_entry *entry;
 765
 766         if (!S_ISDIR(inode->i_mode))
 767                 return;
 768
 769         spin_lock(&sbi->dir_inode_lock);
 770         if (get_dirty_pages(inode) ||
 771                         !is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR)) {
 772                 spin_unlock(&sbi->dir_inode_lock);
 773                 return;
 774         }
 775
 776         entry = F2FS_I(inode)->dirty_dir;
 777         list_del(&entry->list);
 778         F2FS_I(inode)->dirty_dir = NULL;
 779         clear_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 780         stat_dec_dirty_dir(sbi);
 781         spin_unlock(&sbi->dir_inode_lock);
 782         kmem_cache_free(inode_entry_slab, entry);
 783
 784         /* Only from the recovery routine */
 785         if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) {
 786                 clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT);
 787                 iput(inode);
 788         }
 789 }
 790
 791 void sync_dirty_dir_inodes(struct f2fs_sb_info *sbi)
 792 {
 793         struct list_head *head;
 794         struct inode_entry *entry;
 795         struct inode *inode;
 796 retry:
 797         if (unlikely(f2fs_cp_error(sbi)))
 798                 return;
 799
 800         spin_lock(&sbi->dir_inode_lock);
 801
 802         head = &sbi->dir_inode_list;
 803         if (list_empty(head)) {
 804                 spin_unlock(&sbi->dir_inode_lock);
 805                 return;
 806         }
 807         entry = list_entry(head->next, struct inode_entry, list);
 808         inode = igrab(entry->inode);
 809         spin_unlock(&sbi->dir_inode_lock);
 810         if (inode) {
 811                 filemap_fdatawrite(inode->i_mapping);
 812                 iput(inode);
 813         } else {
 814                 /*
 815                  * We should submit bio, since it exists several
 816                  * wribacking dentry pages in the freeing inode.
 817                  */
 818                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 819                 cond_resched();
 820         }
 821         goto retry;
 822 }
 823
 824 /*
 825  * Freeze all the FS-operations for checkpoint.
 826  */
 827 static int block_operations(struct f2fs_sb_info *sbi)
 828 {
 829         struct writeback_control wbc = {
 830                 .sync_mode = WB_SYNC_ALL,
 831                 .nr_to_write = LONG_MAX,
 832                 .for_reclaim = 0,
 833         };
 834         struct blk_plug plug;
 835         int err = 0;
 836
 837         blk_start_plug(&plug);
 838
 839 retry_flush_dents:
 840         f2fs_lock_all(sbi);
 841         /* write all the dirty dentry pages */
 842         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 843                 f2fs_unlock_all(sbi);
 844                 sync_dirty_dir_inodes(sbi);
 845                 if (unlikely(f2fs_cp_error(sbi))) {
 846                         err = -EIO;
 847                         goto out;
 848                 }
 849                 goto retry_flush_dents;
 850         }
 851
 852         /*
 853          * POR: we should ensure that there are no dirty node pages
 854          * until finishing nat/sit flush.
 855          */
 856 retry_flush_nodes:
 857         down_write(&sbi->node_write);
 858
 859         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
 860                 up_write(&sbi->node_write);
 861                 sync_node_pages(sbi, 0, &wbc);
 862                 if (unlikely(f2fs_cp_error(sbi))) {
 863                         f2fs_unlock_all(sbi);
 864                         err = -EIO;
 865                         goto out;
 866                 }
 867                 goto retry_flush_nodes;
 868         }
 869 out:
 870         blk_finish_plug(&plug);
 871         return err;
 872 }
 873
 874 static void unblock_operations(struct f2fs_sb_info *sbi)
 875 {
 876         up_write(&sbi->node_write);
 877         f2fs_unlock_all(sbi);
 878 }
 879
 880 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
 881 {
 882         DEFINE_WAIT(wait);
 883
 884         for (;;) {
 885                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
 886
 887                 if (!get_pages(sbi, F2FS_WRITEBACK))
 888                         break;
 889
 890                 io_schedule();
 891         }
 892         finish_wait(&sbi->cp_wait, &wait);
 893 }
 894
 895 static void do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 896 {
 897         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 898         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 899         struct f2fs_nm_info *nm_i = NM_I(sbi);
 900         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
 901         nid_t last_nid = nm_i->next_scan_nid;
 902         block_t start_blk;
 903         unsigned int data_sum_blocks, orphan_blocks;
 904         __u32 crc32 = 0;
 905         int i;
 906         int cp_payload_blks = __cp_payload(sbi);
 907         block_t discard_blk = NEXT_FREE_BLKADDR(sbi, curseg);
 908         bool invalidate = false;
 909
 910         /*
 911          * This avoids to conduct wrong roll-forward operations and uses
 912          * metapages, so should be called prior to sync_meta_pages below.
 913          */
 914         if (discard_next_dnode(sbi, discard_blk))
 915                 invalidate = true;
 916
 917         /* Flush all the NAT/SIT pages */
 918         while (get_pages(sbi, F2FS_DIRTY_META)) {
 919                 sync_meta_pages(sbi, META, LONG_MAX);
 920                 if (unlikely(f2fs_cp_error(sbi)))
 921                         return;
 922         }
 923
 924         next_free_nid(sbi, &last_nid);
 925
 926         /*
 927          * modify checkpoint
 928          * version number is already updated
 929          */
 930         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
 931         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
 932         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
 933         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
 934                 ckpt->cur_node_segno[i] =
 935                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
 936                 ckpt->cur_node_blkoff[i] =
 937                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
 938                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
 939                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
 940         }
 941         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
 942                 ckpt->cur_data_segno[i] =
 943                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
 944                 ckpt->cur_data_blkoff[i] =
 945                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
 946                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
 947                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
 948         }
 949
 950         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
 951         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
 952         ckpt->next_free_nid = cpu_to_le32(last_nid);
 953
 954         /* 2 cp  + n data seg summary + orphan inode blocks */
 955         data_sum_blocks = npages_for_summary_flush(sbi, false);
 956         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
 957                 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 958         else
 959                 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 960
 961         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
 962         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
 963                         orphan_blocks);
 964
 965         if (__remain_node_summaries(cpc->reason))
 966                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
 967                                 cp_payload_blks + data_sum_blocks +
 968                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
 969         else
 970                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
 971                                 cp_payload_blks + data_sum_blocks +
 972                                 orphan_blocks);
 973
 974         if (cpc->reason == CP_UMOUNT)
 975                 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 976         else
 977                 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 978
 979         if (cpc->reason == CP_FASTBOOT)
 980                 set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
 981         else
 982                 clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
 983
 984         if (orphan_num)
 985                 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 986         else
 987                 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 988
 989         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
 990                 set_ckpt_flags(ckpt, CP_FSCK_FLAG);
 991
 992         /* update SIT/NAT bitmap */
 993         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
 994         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
 995
 996         crc32 = f2fs_crc32(ckpt, le32_to_cpu(ckpt->checksum_offset));
 997         *((__le32 *)((unsigned char *)ckpt +
 998                                 le32_to_cpu(ckpt->checksum_offset)))
 999                                 = cpu_to_le32(crc32);
1000
1001         start_blk = __start_cp_addr(sbi);
1002
1003         /* write out checkpoint buffer at block 0 */
1004         update_meta_page(sbi, ckpt, start_blk++);
1005
1006         for (i = 1; i < 1 + cp_payload_blks; i++)
1007                 update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1008                                                         start_blk++);
1009
1010         if (orphan_num) {
1011                 write_orphan_inodes(sbi, start_blk);
1012                 start_blk += orphan_blocks;
1013         }
1014
1015         write_data_summaries(sbi, start_blk);
1016         start_blk += data_sum_blocks;
1017         if (__remain_node_summaries(cpc->reason)) {
1018                 write_node_summaries(sbi, start_blk);
1019                 start_blk += NR_CURSEG_NODE_TYPE;
1020         }
1021
1022         /* writeout checkpoint block */
1023         update_meta_page(sbi, ckpt, start_blk);
1024
1025         /* wait for previous submitted node/meta pages writeback */
1026         wait_on_all_pages_writeback(sbi);
1027
1028         if (unlikely(f2fs_cp_error(sbi)))
1029                 return;
1030
1031         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LONG_MAX);
1032         filemap_fdatawait_range(META_MAPPING(sbi), 0, LONG_MAX);
1033
1034         /* update user_block_counts */
1035         sbi->last_valid_block_count = sbi->total_valid_block_count;
1036         sbi->alloc_valid_block_count = 0;
1037
1038         /* Here, we only have one bio having CP pack */
1039         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
1040
1041         /* wait for previous submitted meta pages writeback */
1042         wait_on_all_pages_writeback(sbi);
1043
1044         /*
1045          * invalidate meta page which is used temporarily for zeroing out
1046          * block at the end of warm node chain.
1047          */
1048         if (invalidate)
1049                 invalidate_mapping_pages(META_MAPPING(sbi), discard_blk,
1050                                                                 discard_blk);
1051
1052         release_dirty_inode(sbi);
1053
1054         if (unlikely(f2fs_cp_error(sbi)))
1055                 return;
1056
1057         clear_prefree_segments(sbi, cpc);
1058         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1059 }
1060
1061 /*
1062  * We guarantee that this checkpoint procedure will not fail.
1063  */
1064 void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1065 {
1066         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1067         unsigned long long ckpt_ver;
1068
1069         mutex_lock(&sbi->cp_mutex);
1070
1071         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1072                 (cpc->reason == CP_FASTBOOT || cpc->reason == CP_SYNC ||
1073                 (cpc->reason == CP_DISCARD && !sbi->discard_blks)))
1074                 goto out;
1075         if (unlikely(f2fs_cp_error(sbi)))
1076                 goto out;
1077         if (f2fs_readonly(sbi->sb))
1078                 goto out;
1079
1080         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1081
1082         if (block_operations(sbi))
1083                 goto out;
1084
1085         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1086
1087         f2fs_submit_merged_bio(sbi, DATA, WRITE);
1088         f2fs_submit_merged_bio(sbi, NODE, WRITE);
1089         f2fs_submit_merged_bio(sbi, META, WRITE);
1090
1091         /*
1092          * update checkpoint pack index
1093          * Increase the version number so that
1094          * SIT entries and seg summaries are written at correct place
1095          */
1096         ckpt_ver = cur_cp_version(ckpt);
1097         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1098
1099         /* write cached NAT/SIT entries to NAT/SIT area */
1100         flush_nat_entries(sbi);
1101         flush_sit_entries(sbi, cpc);
1102
1103         /* unlock all the fs_lock[] in do_checkpoint() */
1104         do_checkpoint(sbi, cpc);
1105
1106         unblock_operations(sbi);
1107         stat_inc_cp_count(sbi->stat_info);
1108
1109         if (cpc->reason == CP_RECOVERY)
1110                 f2fs_msg(sbi->sb, KERN_NOTICE,
1111                         "checkpoint: version = %llx", ckpt_ver);
1112 out:
1113         mutex_unlock(&sbi->cp_mutex);
1114         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1115 }
1116
1117 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1118 {
1119         int i;
1120
1121         for (i = 0; i < MAX_INO_ENTRY; i++) {
1122                 struct inode_management *im = &sbi->im[i];
1123
1124                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1125                 spin_lock_init(&im->ino_lock);
1126                 INIT_LIST_HEAD(&im->ino_list);
1127                 im->ino_num = 0;
1128         }
1129
1130         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1131                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1132                                 F2FS_ORPHANS_PER_BLOCK;
1133 }
1134
1135 int __init create_checkpoint_caches(void)
1136 {
1137         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1138                         sizeof(struct ino_entry));
1139         if (!ino_entry_slab)
1140                 return -ENOMEM;
1141         inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1142                         sizeof(struct inode_entry));
1143         if (!inode_entry_slab) {
1144                 kmem_cache_destroy(ino_entry_slab);
1145                 return -ENOMEM;
1146         }
1147         return 0;
1148 }
1149
1150 void destroy_checkpoint_caches(void)
1151 {
1152         kmem_cache_destroy(ino_entry_slab);
1153         kmem_cache_destroy(inode_entry_slab);
1154 }