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 *orphan_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 = sbi->meta_inode->i_mapping;
  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
  42         /* We wait writeback only inside grab_meta_page() */
  43         wait_on_page_writeback(page);
  44         SetPageUptodate(page);
  45         return page;
  46 }
  47
  48 /*
  49  * We guarantee no failure on the returned page.
  50  */
  51 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  52 {
  53         struct address_space *mapping = sbi->meta_inode->i_mapping;
  54         struct page *page;
  55 repeat:
  56         page = grab_cache_page(mapping, index);
  57         if (!page) {
  58                 cond_resched();
  59                 goto repeat;
  60         }
  61         if (PageUptodate(page))
  62                 goto out;
  63
  64         if (f2fs_readpage(sbi, page, index, READ_SYNC))
  65                 goto repeat;
  66
  67         lock_page(page);
  68         if (page->mapping != mapping) {
  69                 f2fs_put_page(page, 1);
  70                 goto repeat;
  71         }
  72 out:
  73         mark_page_accessed(page);
  74         return page;
  75 }
  76
  77 static int f2fs_write_meta_page(struct page *page,
  78                                 struct writeback_control *wbc)
  79 {
  80         struct inode *inode = page->mapping->host;
  81         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  82
  83         /* Should not write any meta pages, if any IO error was occurred */
  84         if (wbc->for_reclaim || sbi->por_doing ||
  85                         is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ERROR_FLAG)) {
  86                 dec_page_count(sbi, F2FS_DIRTY_META);
  87                 wbc->pages_skipped++;
  88                 set_page_dirty(page);
  89                 return AOP_WRITEPAGE_ACTIVATE;
  90         }
  91
  92         wait_on_page_writeback(page);
  93
  94         write_meta_page(sbi, page);
  95         dec_page_count(sbi, F2FS_DIRTY_META);
  96         unlock_page(page);
  97         return 0;
  98 }
  99
 100 static int f2fs_write_meta_pages(struct address_space *mapping,
 101                                 struct writeback_control *wbc)
 102 {
 103         struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
 104         struct block_device *bdev = sbi->sb->s_bdev;
 105         long written;
 106
 107         if (wbc->for_kupdate)
 108                 return 0;
 109
 110         if (get_pages(sbi, F2FS_DIRTY_META) == 0)
 111                 return 0;
 112
 113         /* if mounting is failed, skip writing node pages */
 114         mutex_lock(&sbi->cp_mutex);
 115         written = sync_meta_pages(sbi, META, bio_get_nr_vecs(bdev));
 116         mutex_unlock(&sbi->cp_mutex);
 117         wbc->nr_to_write -= written;
 118         return 0;
 119 }
 120
 121 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 122                                                 long nr_to_write)
 123 {
 124         struct address_space *mapping = sbi->meta_inode->i_mapping;
 125         pgoff_t index = 0, end = LONG_MAX;
 126         struct pagevec pvec;
 127         long nwritten = 0;
 128         struct writeback_control wbc = {
 129                 .for_reclaim = 0,
 130         };
 131
 132         pagevec_init(&pvec, 0);
 133
 134         while (index <= end) {
 135                 int i, nr_pages;
 136                 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 137                                 PAGECACHE_TAG_DIRTY,
 138                                 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
 139                 if (nr_pages == 0)
 140                         break;
 141
 142                 for (i = 0; i < nr_pages; i++) {
 143                         struct page *page = pvec.pages[i];
 144                         lock_page(page);
 145                         BUG_ON(page->mapping != mapping);
 146                         BUG_ON(!PageDirty(page));
 147                         clear_page_dirty_for_io(page);
 148                         if (f2fs_write_meta_page(page, &wbc)) {
 149                                 unlock_page(page);
 150                                 break;
 151                         }
 152                         if (nwritten++ >= nr_to_write)
 153                                 break;
 154                 }
 155                 pagevec_release(&pvec);
 156                 cond_resched();
 157         }
 158
 159         if (nwritten)
 160                 f2fs_submit_bio(sbi, type, nr_to_write == LONG_MAX);
 161
 162         return nwritten;
 163 }
 164
 165 static int f2fs_set_meta_page_dirty(struct page *page)
 166 {
 167         struct address_space *mapping = page->mapping;
 168         struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
 169
 170         SetPageUptodate(page);
 171         if (!PageDirty(page)) {
 172                 __set_page_dirty_nobuffers(page);
 173                 inc_page_count(sbi, F2FS_DIRTY_META);
 174                 return 1;
 175         }
 176         return 0;
 177 }
 178
 179 const struct address_space_operations f2fs_meta_aops = {
 180         .writepage      = f2fs_write_meta_page,
 181         .writepages     = f2fs_write_meta_pages,
 182         .set_page_dirty = f2fs_set_meta_page_dirty,
 183 };
 184
 185 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 186 {
 187         unsigned int max_orphans;
 188         int err = 0;
 189
 190         /*
 191          * considering 512 blocks in a segment 5 blocks are needed for cp
 192          * and log segment summaries. Remaining blocks are used to keep
 193          * orphan entries with the limitation one reserved segment
 194          * for cp pack we can have max 1020*507 orphan entries
 195          */
 196         max_orphans = (sbi->blocks_per_seg - 5) * F2FS_ORPHANS_PER_BLOCK;
 197         mutex_lock(&sbi->orphan_inode_mutex);
 198         if (sbi->n_orphans >= max_orphans)
 199                 err = -ENOSPC;
 200         else
 201                 sbi->n_orphans++;
 202         mutex_unlock(&sbi->orphan_inode_mutex);
 203         return err;
 204 }
 205
 206 void release_orphan_inode(struct f2fs_sb_info *sbi)
 207 {
 208         mutex_lock(&sbi->orphan_inode_mutex);
 209         BUG_ON(sbi->n_orphans == 0);
 210         sbi->n_orphans--;
 211         mutex_unlock(&sbi->orphan_inode_mutex);
 212 }
 213
 214 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 215 {
 216         struct list_head *head, *this;
 217         struct orphan_inode_entry *new = NULL, *orphan = NULL;
 218
 219         mutex_lock(&sbi->orphan_inode_mutex);
 220         head = &sbi->orphan_inode_list;
 221         list_for_each(this, head) {
 222                 orphan = list_entry(this, struct orphan_inode_entry, list);
 223                 if (orphan->ino == ino)
 224                         goto out;
 225                 if (orphan->ino > ino)
 226                         break;
 227                 orphan = NULL;
 228         }
 229
 230         new = f2fs_kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC);
 231         new->ino = ino;
 232
 233         /* add new_oentry into list which is sorted by inode number */
 234         if (orphan)
 235                 list_add(&new->list, this->prev);
 236         else
 237                 list_add_tail(&new->list, head);
 238 out:
 239         mutex_unlock(&sbi->orphan_inode_mutex);
 240 }
 241
 242 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 243 {
 244         struct list_head *head;
 245         struct orphan_inode_entry *orphan;
 246
 247         mutex_lock(&sbi->orphan_inode_mutex);
 248         head = &sbi->orphan_inode_list;
 249         list_for_each_entry(orphan, head, list) {
 250                 if (orphan->ino == ino) {
 251                         list_del(&orphan->list);
 252                         kmem_cache_free(orphan_entry_slab, orphan);
 253                         BUG_ON(sbi->n_orphans == 0);
 254                         sbi->n_orphans--;
 255                         break;
 256                 }
 257         }
 258         mutex_unlock(&sbi->orphan_inode_mutex);
 259 }
 260
 261 static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 262 {
 263         struct inode *inode = f2fs_iget(sbi->sb, ino);
 264         BUG_ON(IS_ERR(inode));
 265         clear_nlink(inode);
 266
 267         /* truncate all the data during iput */
 268         iput(inode);
 269 }
 270
 271 int recover_orphan_inodes(struct f2fs_sb_info *sbi)
 272 {
 273         block_t start_blk, orphan_blkaddr, i, j;
 274
 275         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
 276                 return 0;
 277
 278         sbi->por_doing = true;
 279         start_blk = __start_cp_addr(sbi) + 1;
 280         orphan_blkaddr = __start_sum_addr(sbi) - 1;
 281
 282         for (i = 0; i < orphan_blkaddr; i++) {
 283                 struct page *page = get_meta_page(sbi, start_blk + i);
 284                 struct f2fs_orphan_block *orphan_blk;
 285
 286                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 287                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 288                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 289                         recover_orphan_inode(sbi, ino);
 290                 }
 291                 f2fs_put_page(page, 1);
 292         }
 293         /* clear Orphan Flag */
 294         clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
 295         sbi->por_doing = false;
 296         return 0;
 297 }
 298
 299 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 300 {
 301         struct list_head *head, *this, *next;
 302         struct f2fs_orphan_block *orphan_blk = NULL;
 303         struct page *page = NULL;
 304         unsigned int nentries = 0;
 305         unsigned short index = 1;
 306         unsigned short orphan_blocks;
 307
 308         orphan_blocks = (unsigned short)((sbi->n_orphans +
 309                 (F2FS_ORPHANS_PER_BLOCK - 1)) / F2FS_ORPHANS_PER_BLOCK);
 310
 311         mutex_lock(&sbi->orphan_inode_mutex);
 312         head = &sbi->orphan_inode_list;
 313
 314         /* loop for each orphan inode entry and write them in Jornal block */
 315         list_for_each_safe(this, next, head) {
 316                 struct orphan_inode_entry *orphan;
 317
 318                 orphan = list_entry(this, struct orphan_inode_entry, list);
 319
 320                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 321                         /*
 322                          * an orphan block is full of 1020 entries,
 323                          * then we need to flush current orphan blocks
 324                          * and bring another one in memory
 325                          */
 326                         orphan_blk->blk_addr = cpu_to_le16(index);
 327                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 328                         orphan_blk->entry_count = cpu_to_le32(nentries);
 329                         set_page_dirty(page);
 330                         f2fs_put_page(page, 1);
 331                         index++;
 332                         start_blk++;
 333                         nentries = 0;
 334                         page = NULL;
 335                 }
 336                 if (page)
 337                         goto page_exist;
 338
 339                 page = grab_meta_page(sbi, start_blk);
 340                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 341                 memset(orphan_blk, 0, sizeof(*orphan_blk));
 342 page_exist:
 343                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 344         }
 345         if (!page)
 346                 goto end;
 347
 348         orphan_blk->blk_addr = cpu_to_le16(index);
 349         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 350         orphan_blk->entry_count = cpu_to_le32(nentries);
 351         set_page_dirty(page);
 352         f2fs_put_page(page, 1);
 353 end:
 354         mutex_unlock(&sbi->orphan_inode_mutex);
 355 }
 356
 357 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 358                                 block_t cp_addr, unsigned long long *version)
 359 {
 360         struct page *cp_page_1, *cp_page_2 = NULL;
 361         unsigned long blk_size = sbi->blocksize;
 362         struct f2fs_checkpoint *cp_block;
 363         unsigned long long cur_version = 0, pre_version = 0;
 364         size_t crc_offset;
 365         __u32 crc = 0;
 366
 367         /* Read the 1st cp block in this CP pack */
 368         cp_page_1 = get_meta_page(sbi, cp_addr);
 369
 370         /* get the version number */
 371         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
 372         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 373         if (crc_offset >= blk_size)
 374                 goto invalid_cp1;
 375
 376         crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset)));
 377         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 378                 goto invalid_cp1;
 379
 380         pre_version = cur_cp_version(cp_block);
 381
 382         /* Read the 2nd cp block in this CP pack */
 383         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 384         cp_page_2 = get_meta_page(sbi, cp_addr);
 385
 386         cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
 387         crc_offset = le32_to_cpu(cp_block->checksum_offset);
 388         if (crc_offset >= blk_size)
 389                 goto invalid_cp2;
 390
 391         crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset)));
 392         if (!f2fs_crc_valid(crc, cp_block, crc_offset))
 393                 goto invalid_cp2;
 394
 395         cur_version = cur_cp_version(cp_block);
 396
 397         if (cur_version == pre_version) {
 398                 *version = cur_version;
 399                 f2fs_put_page(cp_page_2, 1);
 400                 return cp_page_1;
 401         }
 402 invalid_cp2:
 403         f2fs_put_page(cp_page_2, 1);
 404 invalid_cp1:
 405         f2fs_put_page(cp_page_1, 1);
 406         return NULL;
 407 }
 408
 409 int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 410 {
 411         struct f2fs_checkpoint *cp_block;
 412         struct f2fs_super_block *fsb = sbi->raw_super;
 413         struct page *cp1, *cp2, *cur_page;
 414         unsigned long blk_size = sbi->blocksize;
 415         unsigned long long cp1_version = 0, cp2_version = 0;
 416         unsigned long long cp_start_blk_no;
 417
 418         sbi->ckpt = kzalloc(blk_size, GFP_KERNEL);
 419         if (!sbi->ckpt)
 420                 return -ENOMEM;
 421         /*
 422          * Finding out valid cp block involves read both
 423          * sets( cp pack1 and cp pack 2)
 424          */
 425         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 426         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 427
 428         /* The second checkpoint pack should start at the next segment */
 429         cp_start_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 430         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 431
 432         if (cp1 && cp2) {
 433                 if (ver_after(cp2_version, cp1_version))
 434                         cur_page = cp2;
 435                 else
 436                         cur_page = cp1;
 437         } else if (cp1) {
 438                 cur_page = cp1;
 439         } else if (cp2) {
 440                 cur_page = cp2;
 441         } else {
 442                 goto fail_no_cp;
 443         }
 444
 445         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 446         memcpy(sbi->ckpt, cp_block, blk_size);
 447
 448         f2fs_put_page(cp1, 1);
 449         f2fs_put_page(cp2, 1);
 450         return 0;
 451
 452 fail_no_cp:
 453         kfree(sbi->ckpt);
 454         return -EINVAL;
 455 }
 456
 457 static int __add_dirty_inode(struct inode *inode, struct dir_inode_entry *new)
 458 {
 459         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 460         struct list_head *head = &sbi->dir_inode_list;
 461         struct list_head *this;
 462
 463         list_for_each(this, head) {
 464                 struct dir_inode_entry *entry;
 465                 entry = list_entry(this, struct dir_inode_entry, list);
 466                 if (entry->inode == inode)
 467                         return -EEXIST;
 468         }
 469         list_add_tail(&new->list, head);
 470         stat_inc_dirty_dir(sbi);
 471         return 0;
 472 }
 473
 474 void set_dirty_dir_page(struct inode *inode, struct page *page)
 475 {
 476         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 477         struct dir_inode_entry *new;
 478
 479         if (!S_ISDIR(inode->i_mode))
 480                 return;
 481
 482         new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 483         new->inode = inode;
 484         INIT_LIST_HEAD(&new->list);
 485
 486         spin_lock(&sbi->dir_inode_lock);
 487         if (__add_dirty_inode(inode, new))
 488                 kmem_cache_free(inode_entry_slab, new);
 489
 490         inc_page_count(sbi, F2FS_DIRTY_DENTS);
 491         inode_inc_dirty_dents(inode);
 492         SetPagePrivate(page);
 493         spin_unlock(&sbi->dir_inode_lock);
 494 }
 495
 496 void add_dirty_dir_inode(struct inode *inode)
 497 {
 498         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 499         struct dir_inode_entry *new =
 500                         f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
 501
 502         new->inode = inode;
 503         INIT_LIST_HEAD(&new->list);
 504
 505         spin_lock(&sbi->dir_inode_lock);
 506         if (__add_dirty_inode(inode, new))
 507                 kmem_cache_free(inode_entry_slab, new);
 508         spin_unlock(&sbi->dir_inode_lock);
 509 }
 510
 511 void remove_dirty_dir_inode(struct inode *inode)
 512 {
 513         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 514         struct list_head *head = &sbi->dir_inode_list;
 515         struct list_head *this;
 516
 517         if (!S_ISDIR(inode->i_mode))
 518                 return;
 519
 520         spin_lock(&sbi->dir_inode_lock);
 521         if (atomic_read(&F2FS_I(inode)->dirty_dents)) {
 522                 spin_unlock(&sbi->dir_inode_lock);
 523                 return;
 524         }
 525
 526         list_for_each(this, head) {
 527                 struct dir_inode_entry *entry;
 528                 entry = list_entry(this, struct dir_inode_entry, list);
 529                 if (entry->inode == inode) {
 530                         list_del(&entry->list);
 531                         kmem_cache_free(inode_entry_slab, entry);
 532                         stat_dec_dirty_dir(sbi);
 533                         break;
 534                 }
 535         }
 536         spin_unlock(&sbi->dir_inode_lock);
 537
 538         /* Only from the recovery routine */
 539         if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) {
 540                 clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT);
 541                 iput(inode);
 542         }
 543 }
 544
 545 struct inode *check_dirty_dir_inode(struct f2fs_sb_info *sbi, nid_t ino)
 546 {
 547         struct list_head *head = &sbi->dir_inode_list;
 548         struct list_head *this;
 549         struct inode *inode = NULL;
 550
 551         spin_lock(&sbi->dir_inode_lock);
 552         list_for_each(this, head) {
 553                 struct dir_inode_entry *entry;
 554                 entry = list_entry(this, struct dir_inode_entry, list);
 555                 if (entry->inode->i_ino == ino) {
 556                         inode = entry->inode;
 557                         break;
 558                 }
 559         }
 560         spin_unlock(&sbi->dir_inode_lock);
 561         return inode;
 562 }
 563
 564 void sync_dirty_dir_inodes(struct f2fs_sb_info *sbi)
 565 {
 566         struct list_head *head = &sbi->dir_inode_list;
 567         struct dir_inode_entry *entry;
 568         struct inode *inode;
 569 retry:
 570         spin_lock(&sbi->dir_inode_lock);
 571         if (list_empty(head)) {
 572                 spin_unlock(&sbi->dir_inode_lock);
 573                 return;
 574         }
 575         entry = list_entry(head->next, struct dir_inode_entry, list);
 576         inode = igrab(entry->inode);
 577         spin_unlock(&sbi->dir_inode_lock);
 578         if (inode) {
 579                 filemap_flush(inode->i_mapping);
 580                 iput(inode);
 581         } else {
 582                 /*
 583                  * We should submit bio, since it exists several
 584                  * wribacking dentry pages in the freeing inode.
 585                  */
 586                 f2fs_submit_bio(sbi, DATA, true);
 587         }
 588         goto retry;
 589 }
 590
 591 /*
 592  * Freeze all the FS-operations for checkpoint.
 593  */
 594 static void block_operations(struct f2fs_sb_info *sbi)
 595 {
 596         struct writeback_control wbc = {
 597                 .sync_mode = WB_SYNC_ALL,
 598                 .nr_to_write = LONG_MAX,
 599                 .for_reclaim = 0,
 600         };
 601         struct blk_plug plug;
 602
 603         blk_start_plug(&plug);
 604
 605 retry_flush_dents:
 606         f2fs_lock_all(sbi);
 607         /* write all the dirty dentry pages */
 608         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
 609                 f2fs_unlock_all(sbi);
 610                 sync_dirty_dir_inodes(sbi);
 611                 goto retry_flush_dents;
 612         }
 613
 614         /*
 615          * POR: we should ensure that there is no dirty node pages
 616          * until finishing nat/sit flush.
 617          */
 618 retry_flush_nodes:
 619         mutex_lock(&sbi->node_write);
 620
 621         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
 622                 mutex_unlock(&sbi->node_write);
 623                 sync_node_pages(sbi, 0, &wbc);
 624                 goto retry_flush_nodes;
 625         }
 626         blk_finish_plug(&plug);
 627 }
 628
 629 static void unblock_operations(struct f2fs_sb_info *sbi)
 630 {
 631         mutex_unlock(&sbi->node_write);
 632         f2fs_unlock_all(sbi);
 633 }
 634
 635 static void do_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
 636 {
 637         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 638         nid_t last_nid = 0;
 639         block_t start_blk;
 640         struct page *cp_page;
 641         unsigned int data_sum_blocks, orphan_blocks;
 642         __u32 crc32 = 0;
 643         void *kaddr;
 644         int i;
 645
 646         /* Flush all the NAT/SIT pages */
 647         while (get_pages(sbi, F2FS_DIRTY_META))
 648                 sync_meta_pages(sbi, META, LONG_MAX);
 649
 650         next_free_nid(sbi, &last_nid);
 651
 652         /*
 653          * modify checkpoint
 654          * version number is already updated
 655          */
 656         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
 657         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
 658         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
 659         for (i = 0; i < 3; i++) {
 660                 ckpt->cur_node_segno[i] =
 661                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
 662                 ckpt->cur_node_blkoff[i] =
 663                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
 664                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
 665                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
 666         }
 667         for (i = 0; i < 3; i++) {
 668                 ckpt->cur_data_segno[i] =
 669                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
 670                 ckpt->cur_data_blkoff[i] =
 671                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
 672                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
 673                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
 674         }
 675
 676         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
 677         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
 678         ckpt->next_free_nid = cpu_to_le32(last_nid);
 679
 680         /* 2 cp  + n data seg summary + orphan inode blocks */
 681         data_sum_blocks = npages_for_summary_flush(sbi);
 682         if (data_sum_blocks < 3)
 683                 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 684         else
 685                 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
 686
 687         orphan_blocks = (sbi->n_orphans + F2FS_ORPHANS_PER_BLOCK - 1)
 688                                         / F2FS_ORPHANS_PER_BLOCK;
 689         ckpt->cp_pack_start_sum = cpu_to_le32(1 + orphan_blocks);
 690
 691         if (is_umount) {
 692                 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 693                 ckpt->cp_pack_total_block_count = cpu_to_le32(2 +
 694                         data_sum_blocks + orphan_blocks + NR_CURSEG_NODE_TYPE);
 695         } else {
 696                 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
 697                 ckpt->cp_pack_total_block_count = cpu_to_le32(2 +
 698                         data_sum_blocks + orphan_blocks);
 699         }
 700
 701         if (sbi->n_orphans)
 702                 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 703         else
 704                 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
 705
 706         /* update SIT/NAT bitmap */
 707         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
 708         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
 709
 710         crc32 = f2fs_crc32(ckpt, le32_to_cpu(ckpt->checksum_offset));
 711         *((__le32 *)((unsigned char *)ckpt +
 712                                 le32_to_cpu(ckpt->checksum_offset)))
 713                                 = cpu_to_le32(crc32);
 714
 715         start_blk = __start_cp_addr(sbi);
 716
 717         /* write out checkpoint buffer at block 0 */
 718         cp_page = grab_meta_page(sbi, start_blk++);
 719         kaddr = page_address(cp_page);
 720         memcpy(kaddr, ckpt, (1 << sbi->log_blocksize));
 721         set_page_dirty(cp_page);
 722         f2fs_put_page(cp_page, 1);
 723
 724         if (sbi->n_orphans) {
 725                 write_orphan_inodes(sbi, start_blk);
 726                 start_blk += orphan_blocks;
 727         }
 728
 729         write_data_summaries(sbi, start_blk);
 730         start_blk += data_sum_blocks;
 731         if (is_umount) {
 732                 write_node_summaries(sbi, start_blk);
 733                 start_blk += NR_CURSEG_NODE_TYPE;
 734         }
 735
 736         /* writeout checkpoint block */
 737         cp_page = grab_meta_page(sbi, start_blk);
 738         kaddr = page_address(cp_page);
 739         memcpy(kaddr, ckpt, (1 << sbi->log_blocksize));
 740         set_page_dirty(cp_page);
 741         f2fs_put_page(cp_page, 1);
 742
 743         /* wait for previous submitted node/meta pages writeback */
 744         sbi->cp_task = current;
 745         while (get_pages(sbi, F2FS_WRITEBACK)) {
 746                 set_current_state(TASK_UNINTERRUPTIBLE);
 747                 if (!get_pages(sbi, F2FS_WRITEBACK))
 748                         break;
 749                 io_schedule();
 750         }
 751         __set_current_state(TASK_RUNNING);
 752         sbi->cp_task = NULL;
 753
 754         filemap_fdatawait_range(sbi->node_inode->i_mapping, 0, LONG_MAX);
 755         filemap_fdatawait_range(sbi->meta_inode->i_mapping, 0, LONG_MAX);
 756
 757         /* update user_block_counts */
 758         sbi->last_valid_block_count = sbi->total_valid_block_count;
 759         sbi->alloc_valid_block_count = 0;
 760
 761         /* Here, we only have one bio having CP pack */
 762         sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
 763
 764         if (!is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
 765                 clear_prefree_segments(sbi);
 766                 F2FS_RESET_SB_DIRT(sbi);
 767         }
 768 }
 769
 770 /*
 771  * We guarantee that this checkpoint procedure should not fail.
 772  */
 773 void write_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
 774 {
 775         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 776         unsigned long long ckpt_ver;
 777
 778         trace_f2fs_write_checkpoint(sbi->sb, is_umount, "start block_ops");
 779
 780         mutex_lock(&sbi->cp_mutex);
 781         block_operations(sbi);
 782
 783         trace_f2fs_write_checkpoint(sbi->sb, is_umount, "finish block_ops");
 784
 785         f2fs_submit_bio(sbi, DATA, true);
 786         f2fs_submit_bio(sbi, NODE, true);
 787         f2fs_submit_bio(sbi, META, true);
 788
 789         /*
 790          * update checkpoint pack index
 791          * Increase the version number so that
 792          * SIT entries and seg summaries are written at correct place
 793          */
 794         ckpt_ver = cur_cp_version(ckpt);
 795         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
 796
 797         /* write cached NAT/SIT entries to NAT/SIT area */
 798         flush_nat_entries(sbi);
 799         flush_sit_entries(sbi);
 800
 801         /* unlock all the fs_lock[] in do_checkpoint() */
 802         do_checkpoint(sbi, is_umount);
 803
 804         unblock_operations(sbi);
 805         mutex_unlock(&sbi->cp_mutex);
 806
 807         trace_f2fs_write_checkpoint(sbi->sb, is_umount, "finish checkpoint");
 808 }
 809
 810 void init_orphan_info(struct f2fs_sb_info *sbi)
 811 {
 812         mutex_init(&sbi->orphan_inode_mutex);
 813         INIT_LIST_HEAD(&sbi->orphan_inode_list);
 814         sbi->n_orphans = 0;
 815 }
 816
 817 int __init create_checkpoint_caches(void)
 818 {
 819         orphan_entry_slab = f2fs_kmem_cache_create("f2fs_orphan_entry",
 820                         sizeof(struct orphan_inode_entry), NULL);
 821         if (unlikely(!orphan_entry_slab))
 822                 return -ENOMEM;
 823         inode_entry_slab = f2fs_kmem_cache_create("f2fs_dirty_dir_entry",
 824                         sizeof(struct dir_inode_entry), NULL);
 825         if (unlikely(!inode_entry_slab)) {
 826                 kmem_cache_destroy(orphan_entry_slab);
 827                 return -ENOMEM;
 828         }
 829         return 0;
 830 }
 831
 832 void destroy_checkpoint_caches(void)
 833 {
 834         kmem_cache_destroy(orphan_entry_slab);
 835         kmem_cache_destroy(inode_entry_slab);
 836 }