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 *f2fs_inode_entry_slab;
  28
  29 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
  30 {
  31         f2fs_build_fault_attr(sbi, 0, 0);
  32         set_ckpt_flags(sbi, CP_ERROR_FLAG);
  33         if (!end_io)
  34                 f2fs_flush_merged_writes(sbi);
  35 }
  36
  37 /*
  38  * We guarantee no failure on the returned page.
  39  */
  40 struct page *f2fs_grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  41 {
  42         struct address_space *mapping = META_MAPPING(sbi);
  43         struct page *page = NULL;
  44 repeat:
  45         page = f2fs_grab_cache_page(mapping, index, false);
  46         if (!page) {
  47                 cond_resched();
  48                 goto repeat;
  49         }
  50         f2fs_wait_on_page_writeback(page, META, true);
  51         if (!PageUptodate(page))
  52                 SetPageUptodate(page);
  53         return page;
  54 }
  55
  56 /*
  57  * We guarantee no failure on the returned page.
  58  */
  59 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
  60                                                         bool is_meta)
  61 {
  62         struct address_space *mapping = META_MAPPING(sbi);
  63         struct page *page;
  64         struct f2fs_io_info fio = {
  65                 .sbi = sbi,
  66                 .type = META,
  67                 .op = REQ_OP_READ,
  68                 .op_flags = REQ_META | REQ_PRIO,
  69                 .old_blkaddr = index,
  70                 .new_blkaddr = index,
  71                 .encrypted_page = NULL,
  72                 .is_meta = is_meta,
  73         };
  74         int err;
  75
  76         if (unlikely(!is_meta))
  77                 fio.op_flags &= ~REQ_META;
  78 repeat:
  79         page = f2fs_grab_cache_page(mapping, index, false);
  80         if (!page) {
  81                 cond_resched();
  82                 goto repeat;
  83         }
  84         if (PageUptodate(page))
  85                 goto out;
  86
  87         fio.page = page;
  88
  89         err = f2fs_submit_page_bio(&fio);
  90         if (err) {
  91                 f2fs_put_page(page, 1);
  92                 return ERR_PTR(err);
  93         }
  94
  95         lock_page(page);
  96         if (unlikely(page->mapping != mapping)) {
  97                 f2fs_put_page(page, 1);
  98                 goto repeat;
  99         }
 100
 101         if (unlikely(!PageUptodate(page))) {
 102                 f2fs_put_page(page, 1);
 103                 return ERR_PTR(-EIO);
 104         }
 105 out:
 106         return page;
 107 }
 108
 109 struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 110 {
 111         return __get_meta_page(sbi, index, true);
 112 }
 113
 114 struct page *f2fs_get_meta_page_nofail(struct f2fs_sb_info *sbi, pgoff_t index)
 115 {
 116         struct page *page;
 117         int count = 0;
 118
 119 retry:
 120         page = __get_meta_page(sbi, index, true);
 121         if (IS_ERR(page)) {
 122                 if (PTR_ERR(page) == -EIO &&
 123                                 ++count <= DEFAULT_RETRY_IO_COUNT)
 124                         goto retry;
 125
 126                 f2fs_stop_checkpoint(sbi, false);
 127                 f2fs_bug_on(sbi, 1);
 128         }
 129
 130         return page;
 131 }
 132
 133 /* for POR only */
 134 struct page *f2fs_get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 135 {
 136         return __get_meta_page(sbi, index, false);
 137 }
 138
 139 bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
 140                                         block_t blkaddr, int type)
 141 {
 142         switch (type) {
 143         case META_NAT:
 144                 break;
 145         case META_SIT:
 146                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 147                         return false;
 148                 break;
 149         case META_SSA:
 150                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 151                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 152                         return false;
 153                 break;
 154         case META_CP:
 155                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 156                         blkaddr < __start_cp_addr(sbi)))
 157                         return false;
 158                 break;
 159         case META_POR:
 160         case DATA_GENERIC:
 161                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 162                         blkaddr < MAIN_BLKADDR(sbi))) {
 163                         if (type == DATA_GENERIC) {
 164                                 f2fs_msg(sbi->sb, KERN_WARNING,
 165                                         "access invalid blkaddr:%u", blkaddr);
 166                                 WARN_ON(1);
 167                         }
 168                         return false;
 169                 }
 170                 break;
 171         case META_GENERIC:
 172                 if (unlikely(blkaddr < SEG0_BLKADDR(sbi) ||
 173                         blkaddr >= MAIN_BLKADDR(sbi)))
 174                         return false;
 175                 break;
 176         default:
 177                 BUG();
 178         }
 179
 180         return true;
 181 }
 182
 183 /*
 184  * Readahead CP/NAT/SIT/SSA pages
 185  */
 186 int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 187                                                         int type, bool sync)
 188 {
 189         struct page *page;
 190         block_t blkno = start;
 191         struct f2fs_io_info fio = {
 192                 .sbi = sbi,
 193                 .type = META,
 194                 .op = REQ_OP_READ,
 195                 .op_flags = sync ? (REQ_META | REQ_PRIO) : REQ_RAHEAD,
 196                 .encrypted_page = NULL,
 197                 .in_list = false,
 198                 .is_meta = (type != META_POR),
 199         };
 200         struct blk_plug plug;
 201
 202         if (unlikely(type == META_POR))
 203                 fio.op_flags &= ~REQ_META;
 204
 205         blk_start_plug(&plug);
 206         for (; nrpages-- > 0; blkno++) {
 207
 208                 if (!f2fs_is_valid_blkaddr(sbi, blkno, type))
 209                         goto out;
 210
 211                 switch (type) {
 212                 case META_NAT:
 213                         if (unlikely(blkno >=
 214                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 215                                 blkno = 0;
 216                         /* get nat block addr */
 217                         fio.new_blkaddr = current_nat_addr(sbi,
 218                                         blkno * NAT_ENTRY_PER_BLOCK);
 219                         break;
 220                 case META_SIT:
 221                         if (unlikely(blkno >= TOTAL_SEGS(sbi)))
 222                                 goto out;
 223                         /* get sit block addr */
 224                         fio.new_blkaddr = current_sit_addr(sbi,
 225                                         blkno * SIT_ENTRY_PER_BLOCK);
 226                         break;
 227                 case META_SSA:
 228                 case META_CP:
 229                 case META_POR:
 230                         fio.new_blkaddr = blkno;
 231                         break;
 232                 default:
 233                         BUG();
 234                 }
 235
 236                 page = f2fs_grab_cache_page(META_MAPPING(sbi),
 237                                                 fio.new_blkaddr, false);
 238                 if (!page)
 239                         continue;
 240                 if (PageUptodate(page)) {
 241                         f2fs_put_page(page, 1);
 242                         continue;
 243                 }
 244
 245                 fio.page = page;
 246                 f2fs_submit_page_bio(&fio);
 247                 f2fs_put_page(page, 0);
 248         }
 249 out:
 250         blk_finish_plug(&plug);
 251         return blkno - start;
 252 }
 253
 254 void f2fs_ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 255 {
 256         struct page *page;
 257         bool readahead = false;
 258
 259         page = find_get_page(META_MAPPING(sbi), index);
 260         if (!page || !PageUptodate(page))
 261                 readahead = true;
 262         f2fs_put_page(page, 0);
 263
 264         if (readahead)
 265                 f2fs_ra_meta_pages(sbi, index, BIO_MAX_PAGES, META_POR, true);
 266 }
 267
 268 static int __f2fs_write_meta_page(struct page *page,
 269                                 struct writeback_control *wbc,
 270                                 enum iostat_type io_type)
 271 {
 272         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 273
 274         trace_f2fs_writepage(page, META);
 275
 276         if (unlikely(f2fs_cp_error(sbi)))
 277                 goto redirty_out;
 278         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 279                 goto redirty_out;
 280         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 281                 goto redirty_out;
 282
 283         f2fs_do_write_meta_page(sbi, page, io_type);
 284         dec_page_count(sbi, F2FS_DIRTY_META);
 285
 286         if (wbc->for_reclaim)
 287                 f2fs_submit_merged_write_cond(sbi, page->mapping->host,
 288                                                 0, page->index, META);
 289
 290         unlock_page(page);
 291
 292         if (unlikely(f2fs_cp_error(sbi)))
 293                 f2fs_submit_merged_write(sbi, META);
 294
 295         return 0;
 296
 297 redirty_out:
 298         redirty_page_for_writepage(wbc, page);
 299         return AOP_WRITEPAGE_ACTIVATE;
 300 }
 301
 302 static int f2fs_write_meta_page(struct page *page,
 303                                 struct writeback_control *wbc)
 304 {
 305         return __f2fs_write_meta_page(page, wbc, FS_META_IO);
 306 }
 307
 308 static int f2fs_write_meta_pages(struct address_space *mapping,
 309                                 struct writeback_control *wbc)
 310 {
 311         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 312         long diff, written;
 313
 314         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 315                 goto skip_write;
 316
 317         /* collect a number of dirty meta pages and write together */
 318         if (wbc->for_kupdate ||
 319                 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
 320                 goto skip_write;
 321
 322         /* if locked failed, cp will flush dirty pages instead */
 323         if (!mutex_trylock(&sbi->cp_mutex))
 324                 goto skip_write;
 325
 326         trace_f2fs_writepages(mapping->host, wbc, META);
 327         diff = nr_pages_to_write(sbi, META, wbc);
 328         written = f2fs_sync_meta_pages(sbi, META, wbc->nr_to_write, FS_META_IO);
 329         mutex_unlock(&sbi->cp_mutex);
 330         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 331         return 0;
 332
 333 skip_write:
 334         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 335         trace_f2fs_writepages(mapping->host, wbc, META);
 336         return 0;
 337 }
 338
 339 long f2fs_sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 340                                 long nr_to_write, enum iostat_type io_type)
 341 {
 342         struct address_space *mapping = META_MAPPING(sbi);
 343         pgoff_t index = 0, prev = ULONG_MAX;
 344         struct pagevec pvec;
 345         long nwritten = 0;
 346         int nr_pages;
 347         struct writeback_control wbc = {
 348                 .for_reclaim = 0,
 349         };
 350         struct blk_plug plug;
 351
 352         pagevec_init(&pvec);
 353
 354         blk_start_plug(&plug);
 355
 356         while ((nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 357                                 PAGECACHE_TAG_DIRTY))) {
 358                 int i;
 359
 360                 for (i = 0; i < nr_pages; i++) {
 361                         struct page *page = pvec.pages[i];
 362
 363                         if (prev == ULONG_MAX)
 364                                 prev = page->index - 1;
 365                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 366                                 pagevec_release(&pvec);
 367                                 goto stop;
 368                         }
 369
 370                         lock_page(page);
 371
 372                         if (unlikely(page->mapping != mapping)) {
 373 continue_unlock:
 374                                 unlock_page(page);
 375                                 continue;
 376                         }
 377                         if (!PageDirty(page)) {
 378                                 /* someone wrote it for us */
 379                                 goto continue_unlock;
 380                         }
 381
 382                         f2fs_wait_on_page_writeback(page, META, true);
 383
 384                         BUG_ON(PageWriteback(page));
 385                         if (!clear_page_dirty_for_io(page))
 386                                 goto continue_unlock;
 387
 388                         if (__f2fs_write_meta_page(page, &wbc, io_type)) {
 389                                 unlock_page(page);
 390                                 break;
 391                         }
 392                         nwritten++;
 393                         prev = page->index;
 394                         if (unlikely(nwritten >= nr_to_write))
 395                                 break;
 396                 }
 397                 pagevec_release(&pvec);
 398                 cond_resched();
 399         }
 400 stop:
 401         if (nwritten)
 402                 f2fs_submit_merged_write(sbi, type);
 403
 404         blk_finish_plug(&plug);
 405
 406         return nwritten;
 407 }
 408
 409 static int f2fs_set_meta_page_dirty(struct page *page)
 410 {
 411         trace_f2fs_set_page_dirty(page, META);
 412
 413         if (!PageUptodate(page))
 414                 SetPageUptodate(page);
 415         if (!PageDirty(page)) {
 416                 __set_page_dirty_nobuffers(page);
 417                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 418                 SetPagePrivate(page);
 419                 f2fs_trace_pid(page);
 420                 return 1;
 421         }
 422         return 0;
 423 }
 424
 425 const struct address_space_operations f2fs_meta_aops = {
 426         .writepage      = f2fs_write_meta_page,
 427         .writepages     = f2fs_write_meta_pages,
 428         .set_page_dirty = f2fs_set_meta_page_dirty,
 429         .invalidatepage = f2fs_invalidate_page,
 430         .releasepage    = f2fs_release_page,
 431 #ifdef CONFIG_MIGRATION
 432         .migratepage    = f2fs_migrate_page,
 433 #endif
 434 };
 435
 436 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino,
 437                                                 unsigned int devidx, int type)
 438 {
 439         struct inode_management *im = &sbi->im[type];
 440         struct ino_entry *e, *tmp;
 441
 442         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 443
 444         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 445
 446         spin_lock(&im->ino_lock);
 447         e = radix_tree_lookup(&im->ino_root, ino);
 448         if (!e) {
 449                 e = tmp;
 450                 if (unlikely(radix_tree_insert(&im->ino_root, ino, e)))
 451                         f2fs_bug_on(sbi, 1);
 452
 453                 memset(e, 0, sizeof(struct ino_entry));
 454                 e->ino = ino;
 455
 456                 list_add_tail(&e->list, &im->ino_list);
 457                 if (type != ORPHAN_INO)
 458                         im->ino_num++;
 459         }
 460
 461         if (type == FLUSH_INO)
 462                 f2fs_set_bit(devidx, (char *)&e->dirty_device);
 463
 464         spin_unlock(&im->ino_lock);
 465         radix_tree_preload_end();
 466
 467         if (e != tmp)
 468                 kmem_cache_free(ino_entry_slab, tmp);
 469 }
 470
 471 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 472 {
 473         struct inode_management *im = &sbi->im[type];
 474         struct ino_entry *e;
 475
 476         spin_lock(&im->ino_lock);
 477         e = radix_tree_lookup(&im->ino_root, ino);
 478         if (e) {
 479                 list_del(&e->list);
 480                 radix_tree_delete(&im->ino_root, ino);
 481                 im->ino_num--;
 482                 spin_unlock(&im->ino_lock);
 483                 kmem_cache_free(ino_entry_slab, e);
 484                 return;
 485         }
 486         spin_unlock(&im->ino_lock);
 487 }
 488
 489 void f2fs_add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 490 {
 491         /* add new dirty ino entry into list */
 492         __add_ino_entry(sbi, ino, 0, type);
 493 }
 494
 495 void f2fs_remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 496 {
 497         /* remove dirty ino entry from list */
 498         __remove_ino_entry(sbi, ino, type);
 499 }
 500
 501 /* mode should be APPEND_INO or UPDATE_INO */
 502 bool f2fs_exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 503 {
 504         struct inode_management *im = &sbi->im[mode];
 505         struct ino_entry *e;
 506
 507         spin_lock(&im->ino_lock);
 508         e = radix_tree_lookup(&im->ino_root, ino);
 509         spin_unlock(&im->ino_lock);
 510         return e ? true : false;
 511 }
 512
 513 void f2fs_release_ino_entry(struct f2fs_sb_info *sbi, bool all)
 514 {
 515         struct ino_entry *e, *tmp;
 516         int i;
 517
 518         for (i = all ? ORPHAN_INO : APPEND_INO; i < MAX_INO_ENTRY; i++) {
 519                 struct inode_management *im = &sbi->im[i];
 520
 521                 spin_lock(&im->ino_lock);
 522                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 523                         list_del(&e->list);
 524                         radix_tree_delete(&im->ino_root, e->ino);
 525                         kmem_cache_free(ino_entry_slab, e);
 526                         im->ino_num--;
 527                 }
 528                 spin_unlock(&im->ino_lock);
 529         }
 530 }
 531
 532 void f2fs_set_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 533                                         unsigned int devidx, int type)
 534 {
 535         __add_ino_entry(sbi, ino, devidx, type);
 536 }
 537
 538 bool f2fs_is_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 539                                         unsigned int devidx, int type)
 540 {
 541         struct inode_management *im = &sbi->im[type];
 542         struct ino_entry *e;
 543         bool is_dirty = false;
 544
 545         spin_lock(&im->ino_lock);
 546         e = radix_tree_lookup(&im->ino_root, ino);
 547         if (e && f2fs_test_bit(devidx, (char *)&e->dirty_device))
 548                 is_dirty = true;
 549         spin_unlock(&im->ino_lock);
 550         return is_dirty;
 551 }
 552
 553 int f2fs_acquire_orphan_inode(struct f2fs_sb_info *sbi)
 554 {
 555         struct inode_management *im = &sbi->im[ORPHAN_INO];
 556         int err = 0;
 557
 558         spin_lock(&im->ino_lock);
 559
 560         if (time_to_inject(sbi, FAULT_ORPHAN)) {
 561                 spin_unlock(&im->ino_lock);
 562                 f2fs_show_injection_info(FAULT_ORPHAN);
 563                 return -ENOSPC;
 564         }
 565
 566         if (unlikely(im->ino_num >= sbi->max_orphans))
 567                 err = -ENOSPC;
 568         else
 569                 im->ino_num++;
 570         spin_unlock(&im->ino_lock);
 571
 572         return err;
 573 }
 574
 575 void f2fs_release_orphan_inode(struct f2fs_sb_info *sbi)
 576 {
 577         struct inode_management *im = &sbi->im[ORPHAN_INO];
 578
 579         spin_lock(&im->ino_lock);
 580         f2fs_bug_on(sbi, im->ino_num == 0);
 581         im->ino_num--;
 582         spin_unlock(&im->ino_lock);
 583 }
 584
 585 void f2fs_add_orphan_inode(struct inode *inode)
 586 {
 587         /* add new orphan ino entry into list */
 588         __add_ino_entry(F2FS_I_SB(inode), inode->i_ino, 0, ORPHAN_INO);
 589         f2fs_update_inode_page(inode);
 590 }
 591
 592 void f2fs_remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 593 {
 594         /* remove orphan entry from orphan list */
 595         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 596 }
 597
 598 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 599 {
 600         struct inode *inode;
 601         struct node_info ni;
 602         int err;
 603
 604         inode = f2fs_iget_retry(sbi->sb, ino);
 605         if (IS_ERR(inode)) {
 606                 /*
 607                  * there should be a bug that we can't find the entry
 608                  * to orphan inode.
 609                  */
 610                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 611                 return PTR_ERR(inode);
 612         }
 613
 614         err = dquot_initialize(inode);
 615         if (err) {
 616                 iput(inode);
 617                 goto err_out;
 618         }
 619
 620         clear_nlink(inode);
 621
 622         /* truncate all the data during iput */
 623         iput(inode);
 624
 625         err = f2fs_get_node_info(sbi, ino, &ni);
 626         if (err)
 627                 goto err_out;
 628
 629         /* ENOMEM was fully retried in f2fs_evict_inode. */
 630         if (ni.blk_addr != NULL_ADDR) {
 631                 err = -EIO;
 632                 goto err_out;
 633         }
 634         return 0;
 635
 636 err_out:
 637         set_sbi_flag(sbi, SBI_NEED_FSCK);
 638         f2fs_msg(sbi->sb, KERN_WARNING,
 639                         "%s: orphan failed (ino=%x), run fsck to fix.",
 640                         __func__, ino);
 641         return err;
 642 }
 643
 644 int f2fs_recover_orphan_inodes(struct f2fs_sb_info *sbi)
 645 {
 646         block_t start_blk, orphan_blocks, i, j;
 647         unsigned int s_flags = sbi->sb->s_flags;
 648         int err = 0;
 649 #ifdef CONFIG_QUOTA
 650         int quota_enabled;
 651 #endif
 652
 653         if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG))
 654                 return 0;
 655
 656         if (s_flags & SB_RDONLY) {
 657                 f2fs_msg(sbi->sb, KERN_INFO, "orphan cleanup on readonly fs");
 658                 sbi->sb->s_flags &= ~SB_RDONLY;
 659         }
 660
 661 #ifdef CONFIG_QUOTA
 662         /* Needed for iput() to work correctly and not trash data */
 663         sbi->sb->s_flags |= SB_ACTIVE;
 664
 665         /*
 666          * Turn on quotas which were not enabled for read-only mounts if
 667          * filesystem has quota feature, so that they are updated correctly.
 668          */
 669         quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
 670 #endif
 671
 672         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 673         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 674
 675         f2fs_ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 676
 677         for (i = 0; i < orphan_blocks; i++) {
 678                 struct page *page;
 679                 struct f2fs_orphan_block *orphan_blk;
 680
 681                 page = f2fs_get_meta_page(sbi, start_blk + i);
 682                 if (IS_ERR(page)) {
 683                         err = PTR_ERR(page);
 684                         goto out;
 685                 }
 686
 687                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 688                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 689                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 690                         err = recover_orphan_inode(sbi, ino);
 691                         if (err) {
 692                                 f2fs_put_page(page, 1);
 693                                 goto out;
 694                         }
 695                 }
 696                 f2fs_put_page(page, 1);
 697         }
 698         /* clear Orphan Flag */
 699         clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG);
 700 out:
 701         set_sbi_flag(sbi, SBI_IS_RECOVERED);
 702
 703 #ifdef CONFIG_QUOTA
 704         /* Turn quotas off */
 705         if (quota_enabled)
 706                 f2fs_quota_off_umount(sbi->sb);
 707 #endif
 708         sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
 709
 710         return err;
 711 }
 712
 713 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 714 {
 715         struct list_head *head;
 716         struct f2fs_orphan_block *orphan_blk = NULL;
 717         unsigned int nentries = 0;
 718         unsigned short index = 1;
 719         unsigned short orphan_blocks;
 720         struct page *page = NULL;
 721         struct ino_entry *orphan = NULL;
 722         struct inode_management *im = &sbi->im[ORPHAN_INO];
 723
 724         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 725
 726         /*
 727          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 728          * orphan inode operations are covered under f2fs_lock_op().
 729          * And, spin_lock should be avoided due to page operations below.
 730          */
 731         head = &im->ino_list;
 732
 733         /* loop for each orphan inode entry and write them in Jornal block */
 734         list_for_each_entry(orphan, head, list) {
 735                 if (!page) {
 736                         page = f2fs_grab_meta_page(sbi, start_blk++);
 737                         orphan_blk =
 738                                 (struct f2fs_orphan_block *)page_address(page);
 739                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 740                 }
 741
 742                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 743
 744                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 745                         /*
 746                          * an orphan block is full of 1020 entries,
 747                          * then we need to flush current orphan blocks
 748                          * and bring another one in memory
 749                          */
 750                         orphan_blk->blk_addr = cpu_to_le16(index);
 751                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 752                         orphan_blk->entry_count = cpu_to_le32(nentries);
 753                         set_page_dirty(page);
 754                         f2fs_put_page(page, 1);
 755                         index++;
 756                         nentries = 0;
 757                         page = NULL;
 758                 }
 759         }
 760
 761         if (page) {
 762                 orphan_blk->blk_addr = cpu_to_le16(index);
 763                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 764                 orphan_blk->entry_count = cpu_to_le32(nentries);
 765                 set_page_dirty(page);
 766                 f2fs_put_page(page, 1);
 767         }
 768 }
 769
 770 static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
 771                 struct f2fs_checkpoint **cp_block, struct page **cp_page,
 772                 unsigned long long *version)
 773 {
 774         unsigned long blk_size = sbi->blocksize;
 775         size_t crc_offset = 0;
 776         __u32 crc = 0;
 777
 778         *cp_page = f2fs_get_meta_page(sbi, cp_addr);
 779         if (IS_ERR(*cp_page))
 780                 return PTR_ERR(*cp_page);
 781
 782         *cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
 783
 784         crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
 785         if (crc_offset > (blk_size - sizeof(__le32))) {
 786                 f2fs_put_page(*cp_page, 1);
 787                 f2fs_msg(sbi->sb, KERN_WARNING,
 788                         "invalid crc_offset: %zu", crc_offset);
 789                 return -EINVAL;
 790         }
 791
 792         crc = cur_cp_crc(*cp_block);
 793         if (!f2fs_crc_valid(sbi, crc, *cp_block, crc_offset)) {
 794                 f2fs_put_page(*cp_page, 1);
 795                 f2fs_msg(sbi->sb, KERN_WARNING, "invalid crc value");
 796                 return -EINVAL;
 797         }
 798
 799         *version = cur_cp_version(*cp_block);
 800         return 0;
 801 }
 802
 803 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 804                                 block_t cp_addr, unsigned long long *version)
 805 {
 806         struct page *cp_page_1 = NULL, *cp_page_2 = NULL;
 807         struct f2fs_checkpoint *cp_block = NULL;
 808         unsigned long long cur_version = 0, pre_version = 0;
 809         int err;
 810
 811         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 812                                         &cp_page_1, version);
 813         if (err)
 814                 return NULL;
 815
 816         if (le32_to_cpu(cp_block->cp_pack_total_block_count) >
 817                                         sbi->blocks_per_seg) {
 818                 f2fs_msg(sbi->sb, KERN_WARNING,
 819                         "invalid cp_pack_total_block_count:%u",
 820                         le32_to_cpu(cp_block->cp_pack_total_block_count));
 821                 goto invalid_cp;
 822         }
 823         pre_version = *version;
 824
 825         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 826         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 827                                         &cp_page_2, version);
 828         if (err)
 829                 goto invalid_cp;
 830         cur_version = *version;
 831
 832         if (cur_version == pre_version) {
 833                 *version = cur_version;
 834                 f2fs_put_page(cp_page_2, 1);
 835                 return cp_page_1;
 836         }
 837         f2fs_put_page(cp_page_2, 1);
 838 invalid_cp:
 839         f2fs_put_page(cp_page_1, 1);
 840         return NULL;
 841 }
 842
 843 int f2fs_get_valid_checkpoint(struct f2fs_sb_info *sbi)
 844 {
 845         struct f2fs_checkpoint *cp_block;
 846         struct f2fs_super_block *fsb = sbi->raw_super;
 847         struct page *cp1, *cp2, *cur_page;
 848         unsigned long blk_size = sbi->blocksize;
 849         unsigned long long cp1_version = 0, cp2_version = 0;
 850         unsigned long long cp_start_blk_no;
 851         unsigned int cp_blks = 1 + __cp_payload(sbi);
 852         block_t cp_blk_no;
 853         int i;
 854         int err;
 855
 856         sbi->ckpt = f2fs_kzalloc(sbi, array_size(blk_size, cp_blks),
 857                                  GFP_KERNEL);
 858         if (!sbi->ckpt)
 859                 return -ENOMEM;
 860         /*
 861          * Finding out valid cp block involves read both
 862          * sets( cp pack1 and cp pack 2)
 863          */
 864         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 865         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 866
 867         /* The second checkpoint pack should start at the next segment */
 868         cp_start_blk_no += ((unsigned long long)1) <<
 869                                 le32_to_cpu(fsb->log_blocks_per_seg);
 870         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 871
 872         if (cp1 && cp2) {
 873                 if (ver_after(cp2_version, cp1_version))
 874                         cur_page = cp2;
 875                 else
 876                         cur_page = cp1;
 877         } else if (cp1) {
 878                 cur_page = cp1;
 879         } else if (cp2) {
 880                 cur_page = cp2;
 881         } else {
 882                 err = -EFSCORRUPTED;
 883                 goto fail_no_cp;
 884         }
 885
 886         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 887         memcpy(sbi->ckpt, cp_block, blk_size);
 888
 889         if (cur_page == cp1)
 890                 sbi->cur_cp_pack = 1;
 891         else
 892                 sbi->cur_cp_pack = 2;
 893
 894         /* Sanity checking of checkpoint */
 895         if (f2fs_sanity_check_ckpt(sbi)) {
 896                 err = -EFSCORRUPTED;
 897                 goto free_fail_no_cp;
 898         }
 899
 900         if (cp_blks <= 1)
 901                 goto done;
 902
 903         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 904         if (cur_page == cp2)
 905                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 906
 907         for (i = 1; i < cp_blks; i++) {
 908                 void *sit_bitmap_ptr;
 909                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 910
 911                 cur_page = f2fs_get_meta_page(sbi, cp_blk_no + i);
 912                 if (IS_ERR(cur_page)) {
 913                         err = PTR_ERR(cur_page);
 914                         goto free_fail_no_cp;
 915                 }
 916                 sit_bitmap_ptr = page_address(cur_page);
 917                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 918                 f2fs_put_page(cur_page, 1);
 919         }
 920 done:
 921         f2fs_put_page(cp1, 1);
 922         f2fs_put_page(cp2, 1);
 923         return 0;
 924
 925 free_fail_no_cp:
 926         f2fs_put_page(cp1, 1);
 927         f2fs_put_page(cp2, 1);
 928 fail_no_cp:
 929         kfree(sbi->ckpt);
 930         return err;
 931 }
 932
 933 static void __add_dirty_inode(struct inode *inode, enum inode_type type)
 934 {
 935         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 936         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 937
 938         if (is_inode_flag_set(inode, flag))
 939                 return;
 940
 941         set_inode_flag(inode, flag);
 942         if (!f2fs_is_volatile_file(inode))
 943                 list_add_tail(&F2FS_I(inode)->dirty_list,
 944                                                 &sbi->inode_list[type]);
 945         stat_inc_dirty_inode(sbi, type);
 946 }
 947
 948 static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
 949 {
 950         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 951
 952         if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
 953                 return;
 954
 955         list_del_init(&F2FS_I(inode)->dirty_list);
 956         clear_inode_flag(inode, flag);
 957         stat_dec_dirty_inode(F2FS_I_SB(inode), type);
 958 }
 959
 960 void f2fs_update_dirty_page(struct inode *inode, struct page *page)
 961 {
 962         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 963         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 964
 965         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 966                         !S_ISLNK(inode->i_mode))
 967                 return;
 968
 969         spin_lock(&sbi->inode_lock[type]);
 970         if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
 971                 __add_dirty_inode(inode, type);
 972         inode_inc_dirty_pages(inode);
 973         spin_unlock(&sbi->inode_lock[type]);
 974
 975         SetPagePrivate(page);
 976         f2fs_trace_pid(page);
 977 }
 978
 979 void f2fs_remove_dirty_inode(struct inode *inode)
 980 {
 981         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 982         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
 983
 984         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 985                         !S_ISLNK(inode->i_mode))
 986                 return;
 987
 988         if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
 989                 return;
 990
 991         spin_lock(&sbi->inode_lock[type]);
 992         __remove_dirty_inode(inode, type);
 993         spin_unlock(&sbi->inode_lock[type]);
 994 }
 995
 996 int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
 997 {
 998         struct list_head *head;
 999         struct inode *inode;
1000         struct f2fs_inode_info *fi;
1001         bool is_dir = (type == DIR_INODE);
1002         unsigned long ino = 0;
1003
1004         trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
1005                                 get_pages(sbi, is_dir ?
1006                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1007 retry:
1008         if (unlikely(f2fs_cp_error(sbi))) {
1009                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
1010                                 get_pages(sbi, is_dir ?
1011                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1012                 return -EIO;
1013         }
1014
1015         spin_lock(&sbi->inode_lock[type]);
1016
1017         head = &sbi->inode_list[type];
1018         if (list_empty(head)) {
1019                 spin_unlock(&sbi->inode_lock[type]);
1020                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
1021                                 get_pages(sbi, is_dir ?
1022                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1023                 return 0;
1024         }
1025         fi = list_first_entry(head, struct f2fs_inode_info, dirty_list);
1026         inode = igrab(&fi->vfs_inode);
1027         spin_unlock(&sbi->inode_lock[type]);
1028         if (inode) {
1029                 unsigned long cur_ino = inode->i_ino;
1030
1031                 if (is_dir)
1032                         F2FS_I(inode)->cp_task = current;
1033
1034                 filemap_fdatawrite(inode->i_mapping);
1035
1036                 if (is_dir)
1037                         F2FS_I(inode)->cp_task = NULL;
1038
1039                 iput(inode);
1040                 /* We need to give cpu to another writers. */
1041                 if (ino == cur_ino)
1042                         cond_resched();
1043                 else
1044                         ino = cur_ino;
1045         } else {
1046                 /*
1047                  * We should submit bio, since it exists several
1048                  * wribacking dentry pages in the freeing inode.
1049                  */
1050                 f2fs_submit_merged_write(sbi, DATA);
1051                 cond_resched();
1052         }
1053         goto retry;
1054 }
1055
1056 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
1057 {
1058         struct list_head *head = &sbi->inode_list[DIRTY_META];
1059         struct inode *inode;
1060         struct f2fs_inode_info *fi;
1061         s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
1062
1063         while (total--) {
1064                 if (unlikely(f2fs_cp_error(sbi)))
1065                         return -EIO;
1066
1067                 spin_lock(&sbi->inode_lock[DIRTY_META]);
1068                 if (list_empty(head)) {
1069                         spin_unlock(&sbi->inode_lock[DIRTY_META]);
1070                         return 0;
1071                 }
1072                 fi = list_first_entry(head, struct f2fs_inode_info,
1073                                                         gdirty_list);
1074                 inode = igrab(&fi->vfs_inode);
1075                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
1076                 if (inode) {
1077                         sync_inode_metadata(inode, 0);
1078
1079                         /* it's on eviction */
1080                         if (is_inode_flag_set(inode, FI_DIRTY_INODE))
1081                                 f2fs_update_inode_page(inode);
1082                         iput(inode);
1083                 }
1084         }
1085         return 0;
1086 }
1087
1088 static void __prepare_cp_block(struct f2fs_sb_info *sbi)
1089 {
1090         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1091         struct f2fs_nm_info *nm_i = NM_I(sbi);
1092         nid_t last_nid = nm_i->next_scan_nid;
1093
1094         next_free_nid(sbi, &last_nid);
1095         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
1096         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
1097         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
1098         ckpt->next_free_nid = cpu_to_le32(last_nid);
1099 }
1100
1101 /*
1102  * Freeze all the FS-operations for checkpoint.
1103  */
1104 static int block_operations(struct f2fs_sb_info *sbi)
1105 {
1106         struct writeback_control wbc = {
1107                 .sync_mode = WB_SYNC_ALL,
1108                 .nr_to_write = LONG_MAX,
1109                 .for_reclaim = 0,
1110         };
1111         struct blk_plug plug;
1112         int err = 0;
1113
1114         blk_start_plug(&plug);
1115
1116 retry_flush_dents:
1117         f2fs_lock_all(sbi);
1118         /* write all the dirty dentry pages */
1119         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
1120                 f2fs_unlock_all(sbi);
1121                 err = f2fs_sync_dirty_inodes(sbi, DIR_INODE);
1122                 if (err)
1123                         goto out;
1124                 cond_resched();
1125                 goto retry_flush_dents;
1126         }
1127
1128         /*
1129          * POR: we should ensure that there are no dirty node pages
1130          * until finishing nat/sit flush. inode->i_blocks can be updated.
1131          */
1132         down_write(&sbi->node_change);
1133
1134         if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
1135                 up_write(&sbi->node_change);
1136                 f2fs_unlock_all(sbi);
1137                 err = f2fs_sync_inode_meta(sbi);
1138                 if (err)
1139                         goto out;
1140                 cond_resched();
1141                 goto retry_flush_dents;
1142         }
1143
1144 retry_flush_nodes:
1145         down_write(&sbi->node_write);
1146
1147         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
1148                 up_write(&sbi->node_write);
1149                 atomic_inc(&sbi->wb_sync_req[NODE]);
1150                 err = f2fs_sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO);
1151                 atomic_dec(&sbi->wb_sync_req[NODE]);
1152                 if (err) {
1153                         up_write(&sbi->node_change);
1154                         f2fs_unlock_all(sbi);
1155                         goto out;
1156                 }
1157                 cond_resched();
1158                 goto retry_flush_nodes;
1159         }
1160
1161         /*
1162          * sbi->node_change is used only for AIO write_begin path which produces
1163          * dirty node blocks and some checkpoint values by block allocation.
1164          */
1165         __prepare_cp_block(sbi);
1166         up_write(&sbi->node_change);
1167 out:
1168         blk_finish_plug(&plug);
1169         return err;
1170 }
1171
1172 static void unblock_operations(struct f2fs_sb_info *sbi)
1173 {
1174         up_write(&sbi->node_write);
1175         f2fs_unlock_all(sbi);
1176 }
1177
1178 void f2fs_wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
1179 {
1180         DEFINE_WAIT(wait);
1181
1182         for (;;) {
1183                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
1184
1185                 if (!get_pages(sbi, F2FS_WB_CP_DATA))
1186                         break;
1187
1188                 if (unlikely(f2fs_cp_error(sbi)))
1189                         break;
1190
1191                 io_schedule_timeout(5*HZ);
1192         }
1193         finish_wait(&sbi->cp_wait, &wait);
1194 }
1195
1196 static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1197 {
1198         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
1199         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1200         unsigned long flags;
1201
1202         spin_lock_irqsave(&sbi->cp_lock, flags);
1203
1204         if ((cpc->reason & CP_UMOUNT) &&
1205                         le32_to_cpu(ckpt->cp_pack_total_block_count) >
1206                         sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks)
1207                 disable_nat_bits(sbi, false);
1208
1209         if (cpc->reason & CP_TRIMMED)
1210                 __set_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1211         else
1212                 __clear_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1213
1214         if (cpc->reason & CP_UMOUNT)
1215                 __set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1216         else
1217                 __clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1218
1219         if (cpc->reason & CP_FASTBOOT)
1220                 __set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1221         else
1222                 __clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1223
1224         if (orphan_num)
1225                 __set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1226         else
1227                 __clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1228
1229         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1230                 __set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1231
1232         /* set this flag to activate crc|cp_ver for recovery */
1233         __set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
1234         __clear_ckpt_flags(ckpt, CP_NOCRC_RECOVERY_FLAG);
1235
1236         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1237 }
1238
1239 static void commit_checkpoint(struct f2fs_sb_info *sbi,
1240         void *src, block_t blk_addr)
1241 {
1242         struct writeback_control wbc = {
1243                 .for_reclaim = 0,
1244         };
1245
1246         /*
1247          * pagevec_lookup_tag and lock_page again will take
1248          * some extra time. Therefore, f2fs_update_meta_pages and
1249          * f2fs_sync_meta_pages are combined in this function.
1250          */
1251         struct page *page = f2fs_grab_meta_page(sbi, blk_addr);
1252         int err;
1253
1254         memcpy(page_address(page), src, PAGE_SIZE);
1255         set_page_dirty(page);
1256
1257         f2fs_wait_on_page_writeback(page, META, true);
1258         f2fs_bug_on(sbi, PageWriteback(page));
1259         if (unlikely(!clear_page_dirty_for_io(page)))
1260                 f2fs_bug_on(sbi, 1);
1261
1262         /* writeout cp pack 2 page */
1263         err = __f2fs_write_meta_page(page, &wbc, FS_CP_META_IO);
1264         if (unlikely(err && f2fs_cp_error(sbi))) {
1265                 f2fs_put_page(page, 1);
1266                 return;
1267         }
1268
1269         f2fs_bug_on(sbi, err);
1270         f2fs_put_page(page, 0);
1271
1272         /* submit checkpoint (with barrier if NOBARRIER is not set) */
1273         f2fs_submit_merged_write(sbi, META_FLUSH);
1274 }
1275
1276 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1277 {
1278         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1279         struct f2fs_nm_info *nm_i = NM_I(sbi);
1280         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num, flags;
1281         block_t start_blk;
1282         unsigned int data_sum_blocks, orphan_blocks;
1283         __u32 crc32 = 0;
1284         int i;
1285         int cp_payload_blks = __cp_payload(sbi);
1286         struct super_block *sb = sbi->sb;
1287         struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
1288         u64 kbytes_written;
1289         int err;
1290
1291         /* Flush all the NAT/SIT pages */
1292         while (get_pages(sbi, F2FS_DIRTY_META)) {
1293                 f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1294                 if (unlikely(f2fs_cp_error(sbi)))
1295                         break;
1296         }
1297
1298         /*
1299          * modify checkpoint
1300          * version number is already updated
1301          */
1302         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi, true));
1303         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
1304         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
1305                 ckpt->cur_node_segno[i] =
1306                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
1307                 ckpt->cur_node_blkoff[i] =
1308                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
1309                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
1310                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
1311         }
1312         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
1313                 ckpt->cur_data_segno[i] =
1314                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
1315                 ckpt->cur_data_blkoff[i] =
1316                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
1317                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
1318                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
1319         }
1320
1321         /* 2 cp  + n data seg summary + orphan inode blocks */
1322         data_sum_blocks = f2fs_npages_for_summary_flush(sbi, false);
1323         spin_lock_irqsave(&sbi->cp_lock, flags);
1324         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
1325                 __set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1326         else
1327                 __clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1328         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1329
1330         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
1331         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
1332                         orphan_blocks);
1333
1334         if (__remain_node_summaries(cpc->reason))
1335                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
1336                                 cp_payload_blks + data_sum_blocks +
1337                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
1338         else
1339                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1340                                 cp_payload_blks + data_sum_blocks +
1341                                 orphan_blocks);
1342
1343         /* update ckpt flag for checkpoint */
1344         update_ckpt_flags(sbi, cpc);
1345
1346         /* update SIT/NAT bitmap */
1347         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1348         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1349
1350         crc32 = f2fs_crc32(sbi, ckpt, le32_to_cpu(ckpt->checksum_offset));
1351         *((__le32 *)((unsigned char *)ckpt +
1352                                 le32_to_cpu(ckpt->checksum_offset)))
1353                                 = cpu_to_le32(crc32);
1354
1355         start_blk = __start_cp_next_addr(sbi);
1356
1357         /* write nat bits */
1358         if (enabled_nat_bits(sbi, cpc)) {
1359                 __u64 cp_ver = cur_cp_version(ckpt);
1360                 block_t blk;
1361
1362                 cp_ver |= ((__u64)crc32 << 32);
1363                 *(__le64 *)nm_i->nat_bits = cpu_to_le64(cp_ver);
1364
1365                 blk = start_blk + sbi->blocks_per_seg - nm_i->nat_bits_blocks;
1366                 for (i = 0; i < nm_i->nat_bits_blocks; i++)
1367                         f2fs_update_meta_page(sbi, nm_i->nat_bits +
1368                                         (i << F2FS_BLKSIZE_BITS), blk + i);
1369
1370                 /* Flush all the NAT BITS pages */
1371                 while (get_pages(sbi, F2FS_DIRTY_META)) {
1372                         f2fs_sync_meta_pages(sbi, META, LONG_MAX,
1373                                                         FS_CP_META_IO);
1374                         if (unlikely(f2fs_cp_error(sbi)))
1375                                 break;
1376                 }
1377         }
1378
1379         /* write out checkpoint buffer at block 0 */
1380         f2fs_update_meta_page(sbi, ckpt, start_blk++);
1381
1382         for (i = 1; i < 1 + cp_payload_blks; i++)
1383                 f2fs_update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1384                                                         start_blk++);
1385
1386         if (orphan_num) {
1387                 write_orphan_inodes(sbi, start_blk);
1388                 start_blk += orphan_blocks;
1389         }
1390
1391         f2fs_write_data_summaries(sbi, start_blk);
1392         start_blk += data_sum_blocks;
1393
1394         /* Record write statistics in the hot node summary */
1395         kbytes_written = sbi->kbytes_written;
1396         if (sb->s_bdev->bd_part)
1397                 kbytes_written += BD_PART_WRITTEN(sbi);
1398
1399         seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
1400
1401         if (__remain_node_summaries(cpc->reason)) {
1402                 f2fs_write_node_summaries(sbi, start_blk);
1403                 start_blk += NR_CURSEG_NODE_TYPE;
1404         }
1405
1406         /* update user_block_counts */
1407         sbi->last_valid_block_count = sbi->total_valid_block_count;
1408         percpu_counter_set(&sbi->alloc_valid_block_count, 0);
1409
1410         /* Here, we have one bio having CP pack except cp pack 2 page */
1411         f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1412
1413         /* wait for previous submitted meta pages writeback */
1414         f2fs_wait_on_all_pages_writeback(sbi);
1415
1416         /* flush all device cache */
1417         err = f2fs_flush_device_cache(sbi);
1418         if (err)
1419                 return err;
1420
1421         /* barrier and flush checkpoint cp pack 2 page if it can */
1422         commit_checkpoint(sbi, ckpt, start_blk);
1423         f2fs_wait_on_all_pages_writeback(sbi);
1424
1425         /*
1426          * invalidate intermediate page cache borrowed from meta inode
1427          * which are used for migration of encrypted inode's blocks.
1428          */
1429         if (f2fs_sb_has_encrypt(sbi->sb))
1430                 invalidate_mapping_pages(META_MAPPING(sbi),
1431                                 MAIN_BLKADDR(sbi), MAX_BLKADDR(sbi) - 1);
1432
1433         f2fs_release_ino_entry(sbi, false);
1434
1435         f2fs_reset_fsync_node_info(sbi);
1436
1437         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1438         clear_sbi_flag(sbi, SBI_NEED_CP);
1439         __set_cp_next_pack(sbi);
1440
1441         /*
1442          * redirty superblock if metadata like node page or inode cache is
1443          * updated during writing checkpoint.
1444          */
1445         if (get_pages(sbi, F2FS_DIRTY_NODES) ||
1446                         get_pages(sbi, F2FS_DIRTY_IMETA))
1447                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1448
1449         f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS));
1450
1451         return unlikely(f2fs_cp_error(sbi)) ? -EIO : 0;
1452 }
1453
1454 /*
1455  * We guarantee that this checkpoint procedure will not fail.
1456  */
1457 int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1458 {
1459         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1460         unsigned long long ckpt_ver;
1461         int err = 0;
1462
1463         mutex_lock(&sbi->cp_mutex);
1464
1465         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1466                 ((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) ||
1467                 ((cpc->reason & CP_DISCARD) && !sbi->discard_blks)))
1468                 goto out;
1469         if (unlikely(f2fs_cp_error(sbi))) {
1470                 err = -EIO;
1471                 goto out;
1472         }
1473         if (f2fs_readonly(sbi->sb)) {
1474                 err = -EROFS;
1475                 goto out;
1476         }
1477
1478         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1479
1480         err = block_operations(sbi);
1481         if (err)
1482                 goto out;
1483
1484         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1485
1486         f2fs_flush_merged_writes(sbi);
1487
1488         /* this is the case of multiple fstrims without any changes */
1489         if (cpc->reason & CP_DISCARD) {
1490                 if (!f2fs_exist_trim_candidates(sbi, cpc)) {
1491                         unblock_operations(sbi);
1492                         goto out;
1493                 }
1494
1495                 if (NM_I(sbi)->dirty_nat_cnt == 0 &&
1496                                 SIT_I(sbi)->dirty_sentries == 0 &&
1497                                 prefree_segments(sbi) == 0) {
1498                         f2fs_flush_sit_entries(sbi, cpc);
1499                         f2fs_clear_prefree_segments(sbi, cpc);
1500                         unblock_operations(sbi);
1501                         goto out;
1502                 }
1503         }
1504
1505         /*
1506          * update checkpoint pack index
1507          * Increase the version number so that
1508          * SIT entries and seg summaries are written at correct place
1509          */
1510         ckpt_ver = cur_cp_version(ckpt);
1511         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1512
1513         /* write cached NAT/SIT entries to NAT/SIT area */
1514         f2fs_flush_nat_entries(sbi, cpc);
1515         f2fs_flush_sit_entries(sbi, cpc);
1516
1517         /* unlock all the fs_lock[] in do_checkpoint() */
1518         err = do_checkpoint(sbi, cpc);
1519         if (err)
1520                 f2fs_release_discard_addrs(sbi);
1521         else
1522                 f2fs_clear_prefree_segments(sbi, cpc);
1523
1524         unblock_operations(sbi);
1525         stat_inc_cp_count(sbi->stat_info);
1526
1527         if (cpc->reason & CP_RECOVERY)
1528                 f2fs_msg(sbi->sb, KERN_NOTICE,
1529                         "checkpoint: version = %llx", ckpt_ver);
1530
1531         /* do checkpoint periodically */
1532         f2fs_update_time(sbi, CP_TIME);
1533         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1534 out:
1535         mutex_unlock(&sbi->cp_mutex);
1536         return err;
1537 }
1538
1539 void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi)
1540 {
1541         int i;
1542
1543         for (i = 0; i < MAX_INO_ENTRY; i++) {
1544                 struct inode_management *im = &sbi->im[i];
1545
1546                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1547                 spin_lock_init(&im->ino_lock);
1548                 INIT_LIST_HEAD(&im->ino_list);
1549                 im->ino_num = 0;
1550         }
1551
1552         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1553                         NR_CURSEG_TYPE - __cp_payload(sbi)) *
1554                                 F2FS_ORPHANS_PER_BLOCK;
1555 }
1556
1557 int __init f2fs_create_checkpoint_caches(void)
1558 {
1559         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1560                         sizeof(struct ino_entry));
1561         if (!ino_entry_slab)
1562                 return -ENOMEM;
1563         f2fs_inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1564                         sizeof(struct inode_entry));
1565         if (!f2fs_inode_entry_slab) {
1566                 kmem_cache_destroy(ino_entry_slab);
1567                 return -ENOMEM;
1568         }
1569         return 0;
1570 }
1571
1572 void f2fs_destroy_checkpoint_caches(void)
1573 {
1574         kmem_cache_destroy(ino_entry_slab);
1575         kmem_cache_destroy(f2fs_inode_entry_slab);
1576 }