fs/f2fs/checkpoint.c

   1 /*
   2  * fs/f2fs/checkpoint.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/bio.h>
  13 #include <linux/mpage.h>
  14 #include <linux/writeback.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/f2fs_fs.h>
  17 #include <linux/pagevec.h>
  18 #include <linux/swap.h>
  19
  20 #include "f2fs.h"
  21 #include "node.h"
  22 #include "segment.h"
  23 #include <trace/events/f2fs.h>
  24
  25 static struct kmem_cache *ino_entry_slab;
  26 static struct kmem_cache *inode_entry_slab;
  27
  28 /*
  29  * We guarantee no failure on the returned page.
  30  */
  31 struct page *grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  32 {
  33         struct address_space *mapping = META_MAPPING(sbi);
  34         struct page *page = NULL;
  35 repeat:
  36         page = grab_cache_page(mapping, index);
  37         if (!page) {
  38                 cond_resched();
  39                 goto repeat;
  40         }
  41         f2fs_wait_on_page_writeback(page, META);
  42         SetPageUptodate(page);
  43         return page;
  44 }
  45
  46 /*
  47  * We guarantee no failure on the returned page.
  48  */
  49 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  50 {
  51         struct address_space *mapping = META_MAPPING(sbi);
  52         struct page *page;
  53 repeat:
  54         page = grab_cache_page(mapping, index);
  55         if (!page) {
  56                 cond_resched();
  57                 goto repeat;
  58         }
  59         if (PageUptodate(page))
  60                 goto out;
  61
  62         if (f2fs_submit_page_bio(sbi, page, index,
  63                                 READ_SYNC | REQ_META | REQ_PRIO))
  64                 goto repeat;
  65
  66         lock_page(page);
  67         if (unlikely(page->mapping != mapping)) {
  68                 f2fs_put_page(page, 1);
  69                 goto repeat;
  70         }
  71 out:
  72         return page;
  73 }
  74
  75 struct page *get_meta_page_ra(struct f2fs_sb_info *sbi, pgoff_t index)
  76 {
  77         bool readahead = false;
  78         struct page *page;
  79
  80         page = find_get_page(META_MAPPING(sbi), index);
  81         if (!page || (page && !PageUptodate(page)))
  82                 readahead = true;
  83         f2fs_put_page(page, 0);
  84
  85         if (readahead)
  86                 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR);
  87         return get_meta_page(sbi, index);
  88 }
  89
  90 static inline block_t get_max_meta_blks(struct f2fs_sb_info *sbi, int type)
  91 {
  92         switch (type) {
  93         case META_NAT:
  94                 return NM_I(sbi)->max_nid / NAT_ENTRY_PER_BLOCK;
  95         case META_SIT:
  96                 return SIT_BLK_CNT(sbi);
  97         case META_SSA:
  98         case META_CP:
  99                 return 0;
 100         case META_POR:
 101                 return MAX_BLKADDR(sbi);
 102         default:
 103                 BUG();
 104         }
 105 }
 106
 107 /*
 108  * Readahead CP/NAT/SIT/SSA pages
 109  */
 110 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, int type)
 111 {
 112         block_t prev_blk_addr = 0;
 113         struct page *page;
 114         block_t blkno = start;
 115         block_t max_blks = get_max_meta_blks(sbi, type);
 116
 117         struct f2fs_io_info fio = {
 118                 .type = META,
 119                 .rw = READ_SYNC | REQ_META | REQ_PRIO
 120         };
 121
 122         for (; nrpages-- > 0; blkno++) {
 123                 block_t blk_addr;
 124
 125                 switch (type) {
 126                 case META_NAT:
 127                         /* get nat block addr */
 128                         if (unlikely(blkno >= max_blks))
 129                                 blkno = 0;
 130                         blk_addr = current_nat_addr(sbi,
 131                                         blkno * NAT_ENTRY_PER_BLOCK);
 132                         break;
 133                 case META_SIT:
 134                         /* get sit block addr */
 135                         if (unlikely(blkno >= max_blks))
 136                                 goto out;
 137                         blk_addr = current_sit_addr(sbi,
 138                                         blkno * SIT_ENTRY_PER_BLOCK);
 139                         if (blkno != start && prev_blk_addr + 1 != blk_addr)
 140                                 goto out;
 141                         prev_blk_addr = blk_addr;
 142                         break;
 143                 case META_SSA:
 144                 case META_CP:
 145                 case META_POR:
 146                         if (unlikely(blkno >= max_blks))
 147                                 goto out;
 148                         if (unlikely(blkno < SEG0_BLKADDR(sbi)))
 149                                 goto out;
 150                         blk_addr = blkno;
 151                         break;
 152                 default:
 153                         BUG();
 154                 }
 155
 156                 page = grab_cache_page(META_MAPPING(sbi), 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, blk_addr, &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 static int f2fs_write_meta_page(struct page *page,
 173                                 struct writeback_control *wbc)
 174 {
 175         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 176
 177         trace_f2fs_writepage(page, META);
 178
 179         if (unlikely(sbi->por_doing))
 180                 goto redirty_out;
 181         if (wbc->for_reclaim)
 182                 goto redirty_out;
 183         if (unlikely(f2fs_cp_error(sbi)))
 184                 goto redirty_out;
 185
 186         f2fs_wait_on_page_writeback(page, META);
 187         write_meta_page(sbi, page);
 188         dec_page_count(sbi, F2FS_DIRTY_META);
 189         unlock_page(page);
 190         return 0;
 191
 192 redirty_out:
 193         redirty_page_for_writepage(wbc, page);
 194         return AOP_WRITEPAGE_ACTIVATE;
 195 }
 196
 197 static int f2fs_write_meta_pages(struct address_space *mapping,
 198                                 struct writeback_control *wbc)
 199 {
 200         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 201         long diff, written;
 202
 203         trace_f2fs_writepages(mapping->host, wbc, META);
 204
 205         /* collect a number of dirty meta pages and write together */
 206         if (wbc->for_kupdate ||
 207                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 208                 goto skip_write;
 209
 210         /* if mounting is failed, skip writing node pages */
 211         mutex_lock(&sbi->cp_mutex);
 212         diff = nr_pages_to_write(sbi, META, wbc);
 213         written = sync_meta_pages(sbi, META, wbc->nr_to_write);
 214         mutex_unlock(&sbi->cp_mutex);
 215         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 216         return 0;
 217
 218 skip_write:
 219         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 220         return 0;
 221 }
 222
 223 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 224                                                 long nr_to_write)
 225 {
 226         struct address_space *mapping = META_MAPPING(sbi);
 227         pgoff_t index = 0, end = LONG_MAX;
 228         struct pagevec pvec;
 229         long nwritten = 0;
 230         struct writeback_control wbc = {
 231                 .for_reclaim = 0,
 232         };
 233
 234         pagevec_init(&pvec, 0);
 235
 236         while (index <= end) {
 237                 int i, nr_pages;
 238                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 239                                 PAGECACHE_TAG_DIRTY,
 240                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 241                 if (unlikely(nr_pages == 0))
 242                         break;
 243
 244                 for (i = 0; i < nr_pages; i++) {
 245                         struct page *page = pvec.pages[i];
 246
 247                         lock_page(page);
 248
 249                         if (unlikely(page->mapping != mapping)) {
 250 continue_unlock:
 251                                 unlock_page(page);
 252                                 continue;
 253                         }
 254                         if (!PageDirty(page)) {
 255                                 /* someone wrote it for us */
 256                                 goto continue_unlock;
 257                         }
 258
 259                         if (!clear_page_dirty_for_io(page))
 260                                 goto continue_unlock;
 261
 262                         if (f2fs_write_meta_page(page, &wbc)) {
 263                                 unlock_page(page);
 264                                 break;
 265                         }
 266                         nwritten++;
 267                         if (unlikely(nwritten >= nr_to_write))
 268                                 break;
 269                 }
 270                 pagevec_release(&pvec);
 271                 cond_resched();
 272         }
 273
 274         if (nwritten)
 275                 f2fs_submit_merged_bio(sbi, type, WRITE);
 276
 277         return nwritten;
 278 }
 279
 280 static int f2fs_set_meta_page_dirty(struct page *page)
 281 {
 282         trace_f2fs_set_page_dirty(page, META);
 283
 284         SetPageUptodate(page);
 285         if (!PageDirty(page)) {
 286                 __set_page_dirty_nobuffers(page);
 287                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 288                 return 1;
 289         }
 290         return 0;
 291 }
 292
 293 const struct address_space_operations f2fs_meta_aops = {
 294         .writepage      = f2fs_write_meta_page,
 295         .writepages     = f2fs_write_meta_pages,
 296         .set_page_dirty = f2fs_set_meta_page_dirty,
 297 };
 298
 299 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 300 {
 301         struct ino_entry *e;
 302 retry:
 303         spin_lock(&sbi->ino_lock[type]);
 304
 305         e = radix_tree_lookup(&sbi->ino_root[type], ino);
 306         if (!e) {
 307                 e = kmem_cache_alloc(ino_entry_slab, GFP_ATOMIC);
 308                 if (!e) {
 309                         spin_unlock(&sbi->ino_lock[type]);
 310                         goto retry;
 311                 }
 312                 if (radix_tree_insert(&sbi->ino_root[type], ino, e)) {
 313                         spin_unlock(&sbi->ino_lock[type]);
 314                         kmem_cache_free(ino_entry_slab, e);
 315                         goto retry;
 316                 }
 317                 memset(e, 0, sizeof(struct ino_entry));
 318                 e->ino = ino;
 319
 320                 list_add_tail(&e->list, &sbi->ino_list[type]);
 321         }
 322         spin_unlock(&sbi->ino_lock[type]);
 323 }
 324
 325 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 326 {
 327         struct ino_entry *e;
 328
 329         spin_lock(&sbi->ino_lock[type]);
 330         e = radix_tree_lookup(&sbi->ino_root[type], ino);
 331         if (e) {
 332                 list_del(&e->list);
 333                 radix_tree_delete(&sbi->ino_root[type], ino);
 334                 if (type == ORPHAN_INO)
 335                         sbi->n_orphans--;
 336                 spin_unlock(&sbi->ino_lock[type]);
 337                 kmem_cache_free(ino_entry_slab, e);
 338                 return;
 339         }
 340         spin_unlock(&sbi->ino_lock[type]);
 341 }
 342
 343 void add_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 344 {
 345         /* add new dirty ino entry into list */
 346         __add_ino_entry(sbi, ino, type);
 347 }
 348
 349 void remove_dirty_inode(struct f2fs_sb_info *sbi, nid_t ino, int type)
 350 {
 351         /* remove dirty ino entry from list */
 352         __remove_ino_entry(sbi, ino, type);
 353 }
 354
 355 /* mode should be APPEND_INO or UPDATE_INO */
 356 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 357 {
 358         struct ino_entry *e;
 359         spin_lock(&sbi->ino_lock[mode]);
 360         e = radix_tree_lookup(&sbi->ino_root[mode], ino);
 361         spin_unlock(&sbi->ino_lock[mode]);
 362         return e ? true : false;
 363 }
 364
 365 void release_dirty_inode(struct f2fs_sb_info *sbi)
 366 {
 367         struct ino_entry *e, *tmp;
 368         int i;
 369
 370         for (i = APPEND_INO; i <= UPDATE_INO; i++) {
 371                 spin_lock(&sbi->ino_lock[i]);
 372                 list_for_each_entry_safe(e, tmp, &sbi->ino_list[i], list) {
 373                         list_del(&e->list);
 374                         radix_tree_delete(&sbi->ino_root[i], e->ino);
 375                         kmem_cache_free(ino_entry_slab, e);
 376                 }
 377                 spin_unlock(&sbi->ino_lock[i]);
 378         }
 379 }
 380
 381 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 382 {
 383         int err = 0;
 384
 385         spin_lock(&sbi->ino_lock[ORPHAN_INO]);
 386         if (unlikely(sbi->n_orphans >= sbi->max_orphans))
 387                 err = -ENOSPC;
 388         else
 389                 sbi->n_orphans++;
 390         spin_unlock(&sbi->ino_lock[ORPHAN_INO]);
 391
 392         return err;
 393 }
 394
 395 void release_orphan_inode(struct f2fs_sb_info *sbi)
 396 {
 397         spin_lock(&sbi->ino_lock[ORPHAN_INO]);
 398         f2fs_bug_on(sbi, sbi->n_orphans == 0);
 399         sbi->n_orphans--;
 400         spin_unlock(&sbi->ino_lock[ORPHAN_INO]);
 401 }
 402
 403 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 404 {
 405         /* add new orphan ino entry into list */
 406         __add_ino_entry(sbi, ino, ORPHAN_INO);
 407 }
 408
 409 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 410 {
 411         /* remove orphan entry from orphan list */
 412         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 413 }
 414
 415 static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 416 {
 417         struct inode *inode = f2fs_iget(sbi->sb, ino);
 418         f2fs_bug_on(sbi, IS_ERR(inode));
 419         clear_nlink(inode);
 420
 421         /* truncate all the data during iput */
 422         iput(inode);
 423 }
 424
 425 void recover_orphan_inodes(struct f2fs_sb_info *sbi)
 426 {
 427         block_t start_blk, orphan_blkaddr, i, j;
 428
 429         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
 430                 return;
 431
 432         sbi->por_doing = true;
 433
 434         start_blk = __start_cp_addr(sbi) + 1 +
 435                 le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
 436         orphan_blkaddr = __start_sum_addr(sbi) - 1;
 437
 438         ra_meta_pages(sbi, start_blk, orphan_blkaddr, META_CP);
 439
 440         for (i = 0; i < orphan_blkaddr; i++) {
 441                 struct page *page = get_meta_page(sbi, start_blk + i);
 442                 struct f2fs_orphan_block *orphan_blk;
 443
 444                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 445                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 446                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 447                         recover_orphan_inode(sbi, ino);
 448                 }
 449                 f2fs_put_page(page, 1);
 450         }
 451         /* clear Orphan Flag */
 452         clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
 453         sbi->por_doing = false;
 454         return;
 455 }
 456
 457 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 458 {
 459         struct list_head *head;
 460         struct f2fs_orphan_block *orphan_blk = NULL;
 461         unsigned int nentries = 0;
 462         unsigned short index;
 463         unsigned short orphan_blocks =
 464                         (unsigned short)GET_ORPHAN_BLOCKS(sbi->n_orphans);
 465         struct page *page = NULL;
 466         struct ino_entry *orphan = NULL;
 467
 468         for (index = 0; index < orphan_blocks; index++)
 469                 grab_meta_page(sbi, start_blk + index);
 470
 471         index = 1;
 472         spin_lock(&sbi->ino_lock[ORPHAN_INO]);
 473         head = &sbi->ino_list[ORPHAN_INO];
 474
 475         /* loop for each orphan inode entry and write them in Jornal block */
 476         list_for_each_entry(orphan, head, list) {
 477                 if (!page) {
 478                         page = find_get_page(META_MAPPING(sbi), start_blk++);
 479                         f2fs_bug_on(sbi, !page);
 480                         orphan_blk =
 481                                 (struct f2fs_orphan_block *)page_address(page);
 482                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 483                         f2fs_put_page(page, 0);
 484                 }
 485
 486                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 487
 488                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 489                         /*
 490                          * an orphan block is full of 1020 entries,
 491                          * then we need to flush current orphan blocks
 492                          * and bring another one in memory
 493                          */
 494                         orphan_blk->blk_addr = cpu_to_le16(index);
 495                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 496                         orphan_blk->entry_count = cpu_to_le32(nentries);
 497                         set_page_dirty(page);
 498                         f2fs_put_page(page, 1);
 499                         index++;
 500                         nentries = 0;
 501                         page = NULL;
 502                 }
 503         }
 504
 505         if (page) {
 506                 orphan_blk->blk_addr = cpu_to_le16(index);
 507                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 508                 orphan_blk->entry_count = cpu_to_le32(nentries);
 509                 set_page_dirty(page);
 510                 f2fs_put_page(page, 1);
 511         }
 512
 513         spin_unlock(&sbi->ino_lock[ORPHAN_INO]);
 514 }
 515
 516 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 517                                 block_t cp_addr, unsigned long long *version)
 518 {
 519         struct page *cp_page_1, *cp_page_2 = NULL;
 520         unsigned long blk_size = sbi->blocksize;
 521         struct f2fs_checkpoint *cp_block;
 522         unsigned long long cur_version = 0, pre_version = 0;
 523         size_t crc_offset;
 524         __u32 crc = 0;
 525
 526         /* Read the 1st cp block in this CP pack */
 527         cp_page_1 = get_meta_page(sbi, cp_addr);
 528
 529         /* get the version number */
 530         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
 531         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 532         if (crc_offset >= blk_size)
 533                 goto invalid_cp1;
 534
 535         crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset)));
 536         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 537                 goto invalid_cp1;
 538
 539         pre_version = cur_cp_version(cp_block);
 540
 541         /* Read the 2nd cp block in this CP pack */
 542         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 543         cp_page_2 = get_meta_page(sbi, cp_addr);
 544
 545         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
 546         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 547         if (crc_offset >= blk_size)
 548                 goto invalid_cp2;
 549
 550         crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset)));
 551         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 552                 goto invalid_cp2;
 553
 554         cur_version = cur_cp_version(cp_block);
 555
 556         if (cur_version == pre_version) {
 557                 *version = cur_version;
 558                 f2fs_put_page(cp_page_2, 1);
 559                 return cp_page_1;
 560         }
 561 invalid_cp2:
 562         f2fs_put_page(cp_page_2, 1);
 563 invalid_cp1:
 564         f2fs_put_page(cp_page_1, 1);
 565         return NULL;
 566 }
 567
 568 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 569 {
 570         struct f2fs_checkpoint *cp_block;
 571         struct f2fs_super_block *fsb = sbi->raw_super;
 572         struct page *cp1, *cp2, *cur_page;
 573         unsigned long blk_size = sbi->blocksize;
 574         unsigned long long cp1_version = 0, cp2_version = 0;
 575         unsigned long long cp_start_blk_no;
 576         unsigned int cp_blks = 1 + le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
 577         block_t cp_blk_no;
 578         int i;
 579
 580         sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
 581         if (!sbi->ckpt)
 582                 return -ENOMEM;
 583         /*
 584          * Finding out valid cp block involves read both
 585          * sets( cp pack1 and cp pack 2)
 586          */
 587         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 588         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 589
 590         /* The second checkpoint pack should start at the next segment */
 591         cp_start_blk_no += ((unsigned long long)1) <<
 592                                 le32_to_cpu(fsb->log_blocks_per_seg);
 593         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 594
 595         if (cp1 && cp2) {
 596                 if (ver_after(cp2_version, cp1_version))
 597                         cur_page = cp2;
 598                 else
 599                         cur_page = cp1;
 600         } else if (cp1) {
 601                 cur_page = cp1;
 602         } else if (cp2) {
 603                 cur_page = cp2;
 604         } else {
 605                 goto fail_no_cp;
 606         }
 607
 608         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 609         memcpy(sbi->ckpt, cp_block, blk_size);
 610
 611         if (cp_blks <= 1)
 612                 goto done;
 613
 614         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 615         if (cur_page == cp2)
 616                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 617
 618         for (i = 1; i < cp_blks; i++) {
 619                 void *sit_bitmap_ptr;
 620                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 621
 622                 cur_page = get_meta_page(sbi, cp_blk_no + i);
 623                 sit_bitmap_ptr = page_address(cur_page);
 624                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 625                 f2fs_put_page(cur_page, 1);
 626         }
 627 done:
 628         f2fs_put_page(cp1, 1);
 629         f2fs_put_page(cp2, 1);
 630         return 0;
 631
 632 fail_no_cp:
 633         kfree(sbi->ckpt);
 634         return -EINVAL;
 635 }
 636
 637 static int __add_dirty_inode(struct inode *inode, struct dir_inode_entry *new)
 638 {
 639         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 640
 641         if (is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR))
 642                 return -EEXIST;
 643
 644         set_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 645         F2FS_I(inode)->dirty_dir = new;
 646         list_add_tail(&new->list, &sbi->dir_inode_list);
 647         stat_inc_dirty_dir(sbi);
 648         return 0;
 649 }
 650
 651 void update_dirty_page(struct inode *inode, struct page *page)
 652 {
 653         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 654         struct dir_inode_entry *new;
 655         int ret = 0;
 656
 657         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode))
 658                 return;
 659
 660         if (!S_ISDIR(inode->i_mode)) {
 661                 inode_inc_dirty_pages(inode);
 662                 goto out;
 663         }
 664
 665         new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 666         new->inode = inode;
 667         INIT_LIST_HEAD(&new->list);
 668
 669         spin_lock(&sbi->dir_inode_lock);
 670         ret = __add_dirty_inode(inode, new);
 671         inode_inc_dirty_pages(inode);
 672         spin_unlock(&sbi->dir_inode_lock);
 673
 674         if (ret)
 675                 kmem_cache_free(inode_entry_slab, new);
 676 out:
 677         SetPagePrivate(page);
 678 }
 679
 680 void add_dirty_dir_inode(struct inode *inode)
 681 {
 682         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 683         struct dir_inode_entry *new =
 684                         f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 685         int ret = 0;
 686
 687         new->inode = inode;
 688         INIT_LIST_HEAD(&new->list);
 689
 690         spin_lock(&sbi->dir_inode_lock);
 691         ret = __add_dirty_inode(inode, new);
 692         spin_unlock(&sbi->dir_inode_lock);
 693
 694         if (ret)
 695                 kmem_cache_free(inode_entry_slab, new);
 696 }
 697
 698 void remove_dirty_dir_inode(struct inode *inode)
 699 {
 700         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 701         struct dir_inode_entry *entry;
 702
 703         if (!S_ISDIR(inode->i_mode))
 704                 return;
 705
 706         spin_lock(&sbi->dir_inode_lock);
 707         if (get_dirty_pages(inode) ||
 708                         !is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR)) {
 709                 spin_unlock(&sbi->dir_inode_lock);
 710                 return;
 711         }
 712
 713         entry = F2FS_I(inode)->dirty_dir;
 714         list_del(&entry->list);
 715         F2FS_I(inode)->dirty_dir = NULL;
 716         clear_inode_flag(F2FS_I(inode), FI_DIRTY_DIR);
 717         stat_dec_dirty_dir(sbi);
 718         spin_unlock(&sbi->dir_inode_lock);
 719         kmem_cache_free(inode_entry_slab, entry);
 720
 721         /* Only from the recovery routine */
 722         if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) {
 723                 clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT);
 724                 iput(inode);
 725         }
 726 }
 727
 728 void sync_dirty_dir_inodes(struct f2fs_sb_info *sbi)
 729 {
 730         struct list_head *head;
 731         struct dir_inode_entry *entry;
 732         struct inode *inode;
 733 retry:
 734         spin_lock(&sbi->dir_inode_lock);
 735
 736         head = &sbi->dir_inode_list;
 737         if (list_empty(head)) {
 738                 spin_unlock(&sbi->dir_inode_lock);
 739                 return;
 740         }
 741         entry = list_entry(head->next, struct dir_inode_entry, list);
 742         inode = igrab(entry->inode);
 743         spin_unlock(&sbi->dir_inode_lock);
 744         if (inode) {
 745                 filemap_fdatawrite(inode->i_mapping);
 746                 iput(inode);
 747         } else {
 748                 /*
 749                  * We should submit bio, since it exists several
 750                  * wribacking dentry pages in the freeing inode.
 751                  */
 752                 f2fs_submit_merged_bio(sbi, DATA, WRITE);
 753         }
 754         goto retry;
 755 }
 756
 757 /*
 758  * Freeze all the FS-operations for checkpoint.
 759  */
 760 static int block_operations(struct f2fs_sb_info *sbi)
 761 {
 762         struct writeback_control wbc = {
 763                 .sync_mode = WB_SYNC_ALL,
 764                 .nr_to_write = LONG_MAX,
 765                 .for_reclaim = 0,
 766         };
 767         struct blk_plug plug;
 768         int err = 0;
 769
 770         blk_start_plug(&plug);
 771
 772 retry_flush_dents:
 773         f2fs_lock_all(sbi);
 774         /* write all the dirty dentry pages */
 775         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 776                 f2fs_unlock_all(sbi);
 777                 sync_dirty_dir_inodes(sbi);
 778                 if (unlikely(f2fs_cp_error(sbi))) {
 779                         err = -EIO;
 780                         goto out;
 781                 }
 782                 goto retry_flush_dents;
 783         }
 784
 785         /*
 786          * POR: we should ensure that there are no dirty node pages
 787          * until finishing nat/sit flush.
 788          */
 789 retry_flush_nodes:
 790         down_write(&sbi->node_write);
 791
 792         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
 793                 up_write(&sbi->node_write);
 794                 sync_node_pages(sbi, 0, &wbc);
 795                 if (unlikely(f2fs_cp_error(sbi))) {
 796                         f2fs_unlock_all(sbi);
 797                         err = -EIO;
 798                         goto out;
 799                 }
 800                 goto retry_flush_nodes;
 801         }
 802 out:
 803         blk_finish_plug(&plug);
 804         return err;
 805 }
 806
 807 static void unblock_operations(struct f2fs_sb_info *sbi)
 808 {
 809         up_write(&sbi->node_write);
 810         f2fs_unlock_all(sbi);
 811 }
 812
 813 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
 814 {
 815         DEFINE_WAIT(wait);
 816
 817         for (;;) {
 818                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
 819
 820                 if (!get_pages(sbi, F2FS_WRITEBACK))
 821                         break;
 822
 823                 io_schedule();
 824         }
 825         finish_wait(&sbi->cp_wait, &wait);
 826 }
 827
 828 static void do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 829 {
 830         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 831         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 832         struct f2fs_nm_info *nm_i = NM_I(sbi);
 833         nid_t last_nid = nm_i->next_scan_nid;
 834         block_t start_blk;
 835         struct page *cp_page;
 836         unsigned int data_sum_blocks, orphan_blocks;
 837         __u32 crc32 = 0;
 838         void *kaddr;
 839         int i;
 840         int cp_payload_blks = le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
 841
 842         /*
 843          * This avoids to conduct wrong roll-forward operations and uses
 844          * metapages, so should be called prior to sync_meta_pages below.
 845          */
 846         discard_next_dnode(sbi, NEXT_FREE_BLKADDR(sbi, curseg));
 847
 848         /* Flush all the NAT/SIT pages */
 849         while (get_pages(sbi, F2FS_DIRTY_META)) {
 850                 sync_meta_pages(sbi, META, LONG_MAX);
 851                 if (unlikely(f2fs_cp_error(sbi)))
 852                         return;
 853         }
 854
 855         next_free_nid(sbi, &last_nid);
 856
 857         /*
 858          * modify checkpoint
 859          * version number is already updated
 860          */
 861         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
 862         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
 863         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
 864         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
 865                 ckpt->cur_node_segno[i] =
 866                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
 867                 ckpt->cur_node_blkoff[i] =
 868                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
 869                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
 870                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
 871         }
 872         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
 873                 ckpt->cur_data_segno[i] =
 874                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
 875                 ckpt->cur_data_blkoff[i] =
 876                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
 877                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
 878                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
 879         }
 880
 881         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
 882         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
 883         ckpt->next_free_nid = cpu_to_le32(last_nid);
 884
 885         /* 2 cp  + n data seg summary + orphan inode blocks */
 886         data_sum_blocks = npages_for_summary_flush(sbi);
 887         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
 888                 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 889         else
 890                 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 891
 892         orphan_blocks = GET_ORPHAN_BLOCKS(sbi->n_orphans);
 893         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
 894                         orphan_blocks);
 895
 896         if (cpc->reason == CP_UMOUNT) {
 897                 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 898                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
 899                                 cp_payload_blks + data_sum_blocks +
 900                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
 901         } else {
 902                 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 903                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
 904                                 cp_payload_blks + data_sum_blocks +
 905                                 orphan_blocks);
 906         }
 907
 908         if (sbi->n_orphans)
 909                 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 910         else
 911                 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 912
 913         if (sbi->need_fsck)
 914                 set_ckpt_flags(ckpt, CP_FSCK_FLAG);
 915
 916         /* update SIT/NAT bitmap */
 917         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
 918         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
 919
 920         crc32 = f2fs_crc32(ckpt, le32_to_cpu(ckpt->checksum_offset));
 921         *((__le32 *)((unsigned char *)ckpt +
 922                                 le32_to_cpu(ckpt->checksum_offset)))
 923                                 = cpu_to_le32(crc32);
 924
 925         start_blk = __start_cp_addr(sbi);
 926
 927         /* write out checkpoint buffer at block 0 */
 928         cp_page = grab_meta_page(sbi, start_blk++);
 929         kaddr = page_address(cp_page);
 930         memcpy(kaddr, ckpt, (1 << sbi->log_blocksize));
 931         set_page_dirty(cp_page);
 932         f2fs_put_page(cp_page, 1);
 933
 934         for (i = 1; i < 1 + cp_payload_blks; i++) {
 935                 cp_page = grab_meta_page(sbi, start_blk++);
 936                 kaddr = page_address(cp_page);
 937                 memcpy(kaddr, (char *)ckpt + i * F2FS_BLKSIZE,
 938                                 (1 << sbi->log_blocksize));
 939                 set_page_dirty(cp_page);
 940                 f2fs_put_page(cp_page, 1);
 941         }
 942
 943         if (sbi->n_orphans) {
 944                 write_orphan_inodes(sbi, start_blk);
 945                 start_blk += orphan_blocks;
 946         }
 947
 948         write_data_summaries(sbi, start_blk);
 949         start_blk += data_sum_blocks;
 950         if (cpc->reason == CP_UMOUNT) {
 951                 write_node_summaries(sbi, start_blk);
 952                 start_blk += NR_CURSEG_NODE_TYPE;
 953         }
 954
 955         /* writeout checkpoint block */
 956         cp_page = grab_meta_page(sbi, start_blk);
 957         kaddr = page_address(cp_page);
 958         memcpy(kaddr, ckpt, (1 << sbi->log_blocksize));
 959         set_page_dirty(cp_page);
 960         f2fs_put_page(cp_page, 1);
 961
 962         /* wait for previous submitted node/meta pages writeback */
 963         wait_on_all_pages_writeback(sbi);
 964
 965         if (unlikely(f2fs_cp_error(sbi)))
 966                 return;
 967
 968         filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LONG_MAX);
 969         filemap_fdatawait_range(META_MAPPING(sbi), 0, LONG_MAX);
 970
 971         /* update user_block_counts */
 972         sbi->last_valid_block_count = sbi->total_valid_block_count;
 973         sbi->alloc_valid_block_count = 0;
 974
 975         /* Here, we only have one bio having CP pack */
 976         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
 977
 978         release_dirty_inode(sbi);
 979
 980         if (unlikely(f2fs_cp_error(sbi)))
 981                 return;
 982
 983         clear_prefree_segments(sbi);
 984         F2FS_RESET_SB_DIRT(sbi);
 985 }
 986
 987 /*
 988  * We guarantee that this checkpoint procedure will not fail.
 989  */
 990 void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 991 {
 992         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 993         unsigned long long ckpt_ver;
 994
 995         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
 996
 997         mutex_lock(&sbi->cp_mutex);
 998
 999         if (!sbi->s_dirty && cpc->reason != CP_DISCARD)
1000                 goto out;
1001         if (unlikely(f2fs_cp_error(sbi)))
1002                 goto out;
1003         if (block_operations(sbi))
1004                 goto out;
1005
1006         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1007
1008         f2fs_submit_merged_bio(sbi, DATA, WRITE);
1009         f2fs_submit_merged_bio(sbi, NODE, WRITE);
1010         f2fs_submit_merged_bio(sbi, META, WRITE);
1011
1012         /*
1013          * update checkpoint pack index
1014          * Increase the version number so that
1015          * SIT entries and seg summaries are written at correct place
1016          */
1017         ckpt_ver = cur_cp_version(ckpt);
1018         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1019
1020         /* write cached NAT/SIT entries to NAT/SIT area */
1021         flush_nat_entries(sbi);
1022         flush_sit_entries(sbi, cpc);
1023
1024         /* unlock all the fs_lock[] in do_checkpoint() */
1025         do_checkpoint(sbi, cpc);
1026
1027         unblock_operations(sbi);
1028         stat_inc_cp_count(sbi->stat_info);
1029 out:
1030         mutex_unlock(&sbi->cp_mutex);
1031         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1032 }
1033
1034 void init_ino_entry_info(struct f2fs_sb_info *sbi)
1035 {
1036         int i;
1037
1038         for (i = 0; i < MAX_INO_ENTRY; i++) {
1039                 INIT_RADIX_TREE(&sbi->ino_root[i], GFP_ATOMIC);
1040                 spin_lock_init(&sbi->ino_lock[i]);
1041                 INIT_LIST_HEAD(&sbi->ino_list[i]);
1042         }
1043
1044         /*
1045          * considering 512 blocks in a segment 8 blocks are needed for cp
1046          * and log segment summaries. Remaining blocks are used to keep
1047          * orphan entries with the limitation one reserved segment
1048          * for cp pack we can have max 1020*504 orphan entries
1049          */
1050         sbi->n_orphans = 0;
1051         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1052                         NR_CURSEG_TYPE) * F2FS_ORPHANS_PER_BLOCK;
1053 }
1054
1055 int __init create_checkpoint_caches(void)
1056 {
1057         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1058                         sizeof(struct ino_entry));
1059         if (!ino_entry_slab)
1060                 return -ENOMEM;
1061         inode_entry_slab = f2fs_kmem_cache_create("f2fs_dirty_dir_entry",
1062                         sizeof(struct dir_inode_entry));
1063         if (!inode_entry_slab) {
1064                 kmem_cache_destroy(ino_entry_slab);
1065                 return -ENOMEM;
1066         }
1067         return 0;
1068 }
1069
1070 void destroy_checkpoint_caches(void)
1071 {
1072         kmem_cache_destroy(ino_entry_slab);
1073         kmem_cache_destroy(inode_entry_slab);
1074 }