fs/f2fs/checkpoint.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/checkpoint.c
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  */
   8 #include <linux/fs.h>
   9 #include <linux/bio.h>
  10 #include <linux/mpage.h>
  11 #include <linux/writeback.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/f2fs_fs.h>
  14 #include <linux/pagevec.h>
  15 #include <linux/swap.h>
  16
  17 #include "f2fs.h"
  18 #include "node.h"
  19 #include "segment.h"
  20 #include "trace.h"
  21 #include <trace/events/f2fs.h>
  22
  23 static struct kmem_cache *ino_entry_slab;
  24 struct kmem_cache *f2fs_inode_entry_slab;
  25
  26 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
  27 {
  28         f2fs_build_fault_attr(sbi, 0, 0);
  29         set_ckpt_flags(sbi, CP_ERROR_FLAG);
  30         if (!end_io)
  31                 f2fs_flush_merged_writes(sbi);
  32 }
  33
  34 /*
  35  * We guarantee no failure on the returned page.
  36  */
  37 struct page *f2fs_grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
  38 {
  39         struct address_space *mapping = META_MAPPING(sbi);
  40         struct page *page;
  41 repeat:
  42         page = f2fs_grab_cache_page(mapping, index, false);
  43         if (!page) {
  44                 cond_resched();
  45                 goto repeat;
  46         }
  47         f2fs_wait_on_page_writeback(page, META, true, true);
  48         if (!PageUptodate(page))
  49                 SetPageUptodate(page);
  50         return page;
  51 }
  52
  53 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
  54                                                         bool is_meta)
  55 {
  56         struct address_space *mapping = META_MAPPING(sbi);
  57         struct page *page;
  58         struct f2fs_io_info fio = {
  59                 .sbi = sbi,
  60                 .type = META,
  61                 .op = REQ_OP_READ,
  62                 .op_flags = REQ_META | REQ_PRIO,
  63                 .old_blkaddr = index,
  64                 .new_blkaddr = index,
  65                 .encrypted_page = NULL,
  66                 .is_por = !is_meta,
  67         };
  68         int err;
  69
  70         if (unlikely(!is_meta))
  71                 fio.op_flags &= ~REQ_META;
  72 repeat:
  73         page = f2fs_grab_cache_page(mapping, index, false);
  74         if (!page) {
  75                 cond_resched();
  76                 goto repeat;
  77         }
  78         if (PageUptodate(page))
  79                 goto out;
  80
  81         fio.page = page;
  82
  83         err = f2fs_submit_page_bio(&fio);
  84         if (err) {
  85                 f2fs_put_page(page, 1);
  86                 return ERR_PTR(err);
  87         }
  88
  89         f2fs_update_iostat(sbi, FS_META_READ_IO, F2FS_BLKSIZE);
  90
  91         lock_page(page);
  92         if (unlikely(page->mapping != mapping)) {
  93                 f2fs_put_page(page, 1);
  94                 goto repeat;
  95         }
  96
  97         if (unlikely(!PageUptodate(page))) {
  98                 f2fs_put_page(page, 1);
  99                 return ERR_PTR(-EIO);
 100         }
 101 out:
 102         return page;
 103 }
 104
 105 struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 106 {
 107         return __get_meta_page(sbi, index, true);
 108 }
 109
 110 struct page *f2fs_get_meta_page_retry(struct f2fs_sb_info *sbi, pgoff_t index)
 111 {
 112         struct page *page;
 113         int count = 0;
 114
 115 retry:
 116         page = __get_meta_page(sbi, index, true);
 117         if (IS_ERR(page)) {
 118                 if (PTR_ERR(page) == -EIO &&
 119                                 ++count <= DEFAULT_RETRY_IO_COUNT)
 120                         goto retry;
 121                 f2fs_stop_checkpoint(sbi, false);
 122         }
 123         return page;
 124 }
 125
 126 /* for POR only */
 127 struct page *f2fs_get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 128 {
 129         return __get_meta_page(sbi, index, false);
 130 }
 131
 132 static bool __is_bitmap_valid(struct f2fs_sb_info *sbi, block_t blkaddr,
 133                                                         int type)
 134 {
 135         struct seg_entry *se;
 136         unsigned int segno, offset;
 137         bool exist;
 138
 139         if (type != DATA_GENERIC_ENHANCE && type != DATA_GENERIC_ENHANCE_READ)
 140                 return true;
 141
 142         segno = GET_SEGNO(sbi, blkaddr);
 143         offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 144         se = get_seg_entry(sbi, segno);
 145
 146         exist = f2fs_test_bit(offset, se->cur_valid_map);
 147         if (!exist && type == DATA_GENERIC_ENHANCE) {
 148                 f2fs_err(sbi, "Inconsistent error blkaddr:%u, sit bitmap:%d",
 149                          blkaddr, exist);
 150                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 151                 WARN_ON(1);
 152         }
 153         return exist;
 154 }
 155
 156 bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
 157                                         block_t blkaddr, int type)
 158 {
 159         switch (type) {
 160         case META_NAT:
 161                 break;
 162         case META_SIT:
 163                 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
 164                         return false;
 165                 break;
 166         case META_SSA:
 167                 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
 168                         blkaddr < SM_I(sbi)->ssa_blkaddr))
 169                         return false;
 170                 break;
 171         case META_CP:
 172                 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
 173                         blkaddr < __start_cp_addr(sbi)))
 174                         return false;
 175                 break;
 176         case META_POR:
 177                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 178                         blkaddr < MAIN_BLKADDR(sbi)))
 179                         return false;
 180                 break;
 181         case DATA_GENERIC:
 182         case DATA_GENERIC_ENHANCE:
 183         case DATA_GENERIC_ENHANCE_READ:
 184                 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 185                                 blkaddr < MAIN_BLKADDR(sbi))) {
 186                         f2fs_warn(sbi, "access invalid blkaddr:%u",
 187                                   blkaddr);
 188                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 189                         WARN_ON(1);
 190                         return false;
 191                 } else {
 192                         return __is_bitmap_valid(sbi, blkaddr, type);
 193                 }
 194                 break;
 195         case META_GENERIC:
 196                 if (unlikely(blkaddr < SEG0_BLKADDR(sbi) ||
 197                         blkaddr >= MAIN_BLKADDR(sbi)))
 198                         return false;
 199                 break;
 200         default:
 201                 BUG();
 202         }
 203
 204         return true;
 205 }
 206
 207 /*
 208  * Readahead CP/NAT/SIT/SSA/POR pages
 209  */
 210 int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 211                                                         int type, bool sync)
 212 {
 213         struct page *page;
 214         block_t blkno = start;
 215         struct f2fs_io_info fio = {
 216                 .sbi = sbi,
 217                 .type = META,
 218                 .op = REQ_OP_READ,
 219                 .op_flags = sync ? (REQ_META | REQ_PRIO) : REQ_RAHEAD,
 220                 .encrypted_page = NULL,
 221                 .in_list = false,
 222                 .is_por = (type == META_POR),
 223         };
 224         struct blk_plug plug;
 225         int err;
 226
 227         if (unlikely(type == META_POR))
 228                 fio.op_flags &= ~REQ_META;
 229
 230         blk_start_plug(&plug);
 231         for (; nrpages-- > 0; blkno++) {
 232
 233                 if (!f2fs_is_valid_blkaddr(sbi, blkno, type))
 234                         goto out;
 235
 236                 switch (type) {
 237                 case META_NAT:
 238                         if (unlikely(blkno >=
 239                                         NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
 240                                 blkno = 0;
 241                         /* get nat block addr */
 242                         fio.new_blkaddr = current_nat_addr(sbi,
 243                                         blkno * NAT_ENTRY_PER_BLOCK);
 244                         break;
 245                 case META_SIT:
 246                         if (unlikely(blkno >= TOTAL_SEGS(sbi)))
 247                                 goto out;
 248                         /* get sit block addr */
 249                         fio.new_blkaddr = current_sit_addr(sbi,
 250                                         blkno * SIT_ENTRY_PER_BLOCK);
 251                         break;
 252                 case META_SSA:
 253                 case META_CP:
 254                 case META_POR:
 255                         fio.new_blkaddr = blkno;
 256                         break;
 257                 default:
 258                         BUG();
 259                 }
 260
 261                 page = f2fs_grab_cache_page(META_MAPPING(sbi),
 262                                                 fio.new_blkaddr, false);
 263                 if (!page)
 264                         continue;
 265                 if (PageUptodate(page)) {
 266                         f2fs_put_page(page, 1);
 267                         continue;
 268                 }
 269
 270                 fio.page = page;
 271                 err = f2fs_submit_page_bio(&fio);
 272                 f2fs_put_page(page, err ? 1 : 0);
 273
 274                 if (!err)
 275                         f2fs_update_iostat(sbi, FS_META_READ_IO, F2FS_BLKSIZE);
 276         }
 277 out:
 278         blk_finish_plug(&plug);
 279         return blkno - start;
 280 }
 281
 282 void f2fs_ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
 283 {
 284         struct page *page;
 285         bool readahead = false;
 286
 287         page = find_get_page(META_MAPPING(sbi), index);
 288         if (!page || !PageUptodate(page))
 289                 readahead = true;
 290         f2fs_put_page(page, 0);
 291
 292         if (readahead)
 293                 f2fs_ra_meta_pages(sbi, index, BIO_MAX_PAGES, META_POR, true);
 294 }
 295
 296 static int __f2fs_write_meta_page(struct page *page,
 297                                 struct writeback_control *wbc,
 298                                 enum iostat_type io_type)
 299 {
 300         struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 301
 302         trace_f2fs_writepage(page, META);
 303
 304         if (unlikely(f2fs_cp_error(sbi)))
 305                 goto redirty_out;
 306         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 307                 goto redirty_out;
 308         if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
 309                 goto redirty_out;
 310
 311         f2fs_do_write_meta_page(sbi, page, io_type);
 312         dec_page_count(sbi, F2FS_DIRTY_META);
 313
 314         if (wbc->for_reclaim)
 315                 f2fs_submit_merged_write_cond(sbi, NULL, page, 0, META);
 316
 317         unlock_page(page);
 318
 319         if (unlikely(f2fs_cp_error(sbi)))
 320                 f2fs_submit_merged_write(sbi, META);
 321
 322         return 0;
 323
 324 redirty_out:
 325         redirty_page_for_writepage(wbc, page);
 326         return AOP_WRITEPAGE_ACTIVATE;
 327 }
 328
 329 static int f2fs_write_meta_page(struct page *page,
 330                                 struct writeback_control *wbc)
 331 {
 332         return __f2fs_write_meta_page(page, wbc, FS_META_IO);
 333 }
 334
 335 static int f2fs_write_meta_pages(struct address_space *mapping,
 336                                 struct writeback_control *wbc)
 337 {
 338         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
 339         long diff, written;
 340
 341         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 342                 goto skip_write;
 343
 344         /* collect a number of dirty meta pages and write together */
 345         if (wbc->sync_mode != WB_SYNC_ALL &&
 346                         get_pages(sbi, F2FS_DIRTY_META) <
 347                                         nr_pages_to_skip(sbi, META))
 348                 goto skip_write;
 349
 350         /* if locked failed, cp will flush dirty pages instead */
 351         if (!down_write_trylock(&sbi->cp_global_sem))
 352                 goto skip_write;
 353
 354         trace_f2fs_writepages(mapping->host, wbc, META);
 355         diff = nr_pages_to_write(sbi, META, wbc);
 356         written = f2fs_sync_meta_pages(sbi, META, wbc->nr_to_write, FS_META_IO);
 357         up_write(&sbi->cp_global_sem);
 358         wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
 359         return 0;
 360
 361 skip_write:
 362         wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
 363         trace_f2fs_writepages(mapping->host, wbc, META);
 364         return 0;
 365 }
 366
 367 long f2fs_sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 368                                 long nr_to_write, enum iostat_type io_type)
 369 {
 370         struct address_space *mapping = META_MAPPING(sbi);
 371         pgoff_t index = 0, prev = ULONG_MAX;
 372         struct pagevec pvec;
 373         long nwritten = 0;
 374         int nr_pages;
 375         struct writeback_control wbc = {
 376                 .for_reclaim = 0,
 377         };
 378         struct blk_plug plug;
 379
 380         pagevec_init(&pvec);
 381
 382         blk_start_plug(&plug);
 383
 384         while ((nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 385                                 PAGECACHE_TAG_DIRTY))) {
 386                 int i;
 387
 388                 for (i = 0; i < nr_pages; i++) {
 389                         struct page *page = pvec.pages[i];
 390
 391                         if (prev == ULONG_MAX)
 392                                 prev = page->index - 1;
 393                         if (nr_to_write != LONG_MAX && page->index != prev + 1) {
 394                                 pagevec_release(&pvec);
 395                                 goto stop;
 396                         }
 397
 398                         lock_page(page);
 399
 400                         if (unlikely(page->mapping != mapping)) {
 401 continue_unlock:
 402                                 unlock_page(page);
 403                                 continue;
 404                         }
 405                         if (!PageDirty(page)) {
 406                                 /* someone wrote it for us */
 407                                 goto continue_unlock;
 408                         }
 409
 410                         f2fs_wait_on_page_writeback(page, META, true, true);
 411
 412                         if (!clear_page_dirty_for_io(page))
 413                                 goto continue_unlock;
 414
 415                         if (__f2fs_write_meta_page(page, &wbc, io_type)) {
 416                                 unlock_page(page);
 417                                 break;
 418                         }
 419                         nwritten++;
 420                         prev = page->index;
 421                         if (unlikely(nwritten >= nr_to_write))
 422                                 break;
 423                 }
 424                 pagevec_release(&pvec);
 425                 cond_resched();
 426         }
 427 stop:
 428         if (nwritten)
 429                 f2fs_submit_merged_write(sbi, type);
 430
 431         blk_finish_plug(&plug);
 432
 433         return nwritten;
 434 }
 435
 436 static int f2fs_set_meta_page_dirty(struct page *page)
 437 {
 438         trace_f2fs_set_page_dirty(page, META);
 439
 440         if (!PageUptodate(page))
 441                 SetPageUptodate(page);
 442         if (!PageDirty(page)) {
 443                 __set_page_dirty_nobuffers(page);
 444                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
 445                 f2fs_set_page_private(page, 0);
 446                 f2fs_trace_pid(page);
 447                 return 1;
 448         }
 449         return 0;
 450 }
 451
 452 const struct address_space_operations f2fs_meta_aops = {
 453         .writepage      = f2fs_write_meta_page,
 454         .writepages     = f2fs_write_meta_pages,
 455         .set_page_dirty = f2fs_set_meta_page_dirty,
 456         .invalidatepage = f2fs_invalidate_page,
 457         .releasepage    = f2fs_release_page,
 458 #ifdef CONFIG_MIGRATION
 459         .migratepage    = f2fs_migrate_page,
 460 #endif
 461 };
 462
 463 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino,
 464                                                 unsigned int devidx, int type)
 465 {
 466         struct inode_management *im = &sbi->im[type];
 467         struct ino_entry *e, *tmp;
 468
 469         tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS);
 470
 471         radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
 472
 473         spin_lock(&im->ino_lock);
 474         e = radix_tree_lookup(&im->ino_root, ino);
 475         if (!e) {
 476                 e = tmp;
 477                 if (unlikely(radix_tree_insert(&im->ino_root, ino, e)))
 478                         f2fs_bug_on(sbi, 1);
 479
 480                 memset(e, 0, sizeof(struct ino_entry));
 481                 e->ino = ino;
 482
 483                 list_add_tail(&e->list, &im->ino_list);
 484                 if (type != ORPHAN_INO)
 485                         im->ino_num++;
 486         }
 487
 488         if (type == FLUSH_INO)
 489                 f2fs_set_bit(devidx, (char *)&e->dirty_device);
 490
 491         spin_unlock(&im->ino_lock);
 492         radix_tree_preload_end();
 493
 494         if (e != tmp)
 495                 kmem_cache_free(ino_entry_slab, tmp);
 496 }
 497
 498 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 499 {
 500         struct inode_management *im = &sbi->im[type];
 501         struct ino_entry *e;
 502
 503         spin_lock(&im->ino_lock);
 504         e = radix_tree_lookup(&im->ino_root, ino);
 505         if (e) {
 506                 list_del(&e->list);
 507                 radix_tree_delete(&im->ino_root, ino);
 508                 im->ino_num--;
 509                 spin_unlock(&im->ino_lock);
 510                 kmem_cache_free(ino_entry_slab, e);
 511                 return;
 512         }
 513         spin_unlock(&im->ino_lock);
 514 }
 515
 516 void f2fs_add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 517 {
 518         /* add new dirty ino entry into list */
 519         __add_ino_entry(sbi, ino, 0, type);
 520 }
 521
 522 void f2fs_remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
 523 {
 524         /* remove dirty ino entry from list */
 525         __remove_ino_entry(sbi, ino, type);
 526 }
 527
 528 /* mode should be APPEND_INO, UPDATE_INO or TRANS_DIR_INO */
 529 bool f2fs_exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
 530 {
 531         struct inode_management *im = &sbi->im[mode];
 532         struct ino_entry *e;
 533
 534         spin_lock(&im->ino_lock);
 535         e = radix_tree_lookup(&im->ino_root, ino);
 536         spin_unlock(&im->ino_lock);
 537         return e ? true : false;
 538 }
 539
 540 void f2fs_release_ino_entry(struct f2fs_sb_info *sbi, bool all)
 541 {
 542         struct ino_entry *e, *tmp;
 543         int i;
 544
 545         for (i = all ? ORPHAN_INO : APPEND_INO; i < MAX_INO_ENTRY; i++) {
 546                 struct inode_management *im = &sbi->im[i];
 547
 548                 spin_lock(&im->ino_lock);
 549                 list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
 550                         list_del(&e->list);
 551                         radix_tree_delete(&im->ino_root, e->ino);
 552                         kmem_cache_free(ino_entry_slab, e);
 553                         im->ino_num--;
 554                 }
 555                 spin_unlock(&im->ino_lock);
 556         }
 557 }
 558
 559 void f2fs_set_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 560                                         unsigned int devidx, int type)
 561 {
 562         __add_ino_entry(sbi, ino, devidx, type);
 563 }
 564
 565 bool f2fs_is_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
 566                                         unsigned int devidx, int type)
 567 {
 568         struct inode_management *im = &sbi->im[type];
 569         struct ino_entry *e;
 570         bool is_dirty = false;
 571
 572         spin_lock(&im->ino_lock);
 573         e = radix_tree_lookup(&im->ino_root, ino);
 574         if (e && f2fs_test_bit(devidx, (char *)&e->dirty_device))
 575                 is_dirty = true;
 576         spin_unlock(&im->ino_lock);
 577         return is_dirty;
 578 }
 579
 580 int f2fs_acquire_orphan_inode(struct f2fs_sb_info *sbi)
 581 {
 582         struct inode_management *im = &sbi->im[ORPHAN_INO];
 583         int err = 0;
 584
 585         spin_lock(&im->ino_lock);
 586
 587         if (time_to_inject(sbi, FAULT_ORPHAN)) {
 588                 spin_unlock(&im->ino_lock);
 589                 f2fs_show_injection_info(sbi, FAULT_ORPHAN);
 590                 return -ENOSPC;
 591         }
 592
 593         if (unlikely(im->ino_num >= sbi->max_orphans))
 594                 err = -ENOSPC;
 595         else
 596                 im->ino_num++;
 597         spin_unlock(&im->ino_lock);
 598
 599         return err;
 600 }
 601
 602 void f2fs_release_orphan_inode(struct f2fs_sb_info *sbi)
 603 {
 604         struct inode_management *im = &sbi->im[ORPHAN_INO];
 605
 606         spin_lock(&im->ino_lock);
 607         f2fs_bug_on(sbi, im->ino_num == 0);
 608         im->ino_num--;
 609         spin_unlock(&im->ino_lock);
 610 }
 611
 612 void f2fs_add_orphan_inode(struct inode *inode)
 613 {
 614         /* add new orphan ino entry into list */
 615         __add_ino_entry(F2FS_I_SB(inode), inode->i_ino, 0, ORPHAN_INO);
 616         f2fs_update_inode_page(inode);
 617 }
 618
 619 void f2fs_remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 620 {
 621         /* remove orphan entry from orphan list */
 622         __remove_ino_entry(sbi, ino, ORPHAN_INO);
 623 }
 624
 625 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
 626 {
 627         struct inode *inode;
 628         struct node_info ni;
 629         int err;
 630
 631         inode = f2fs_iget_retry(sbi->sb, ino);
 632         if (IS_ERR(inode)) {
 633                 /*
 634                  * there should be a bug that we can't find the entry
 635                  * to orphan inode.
 636                  */
 637                 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
 638                 return PTR_ERR(inode);
 639         }
 640
 641         err = dquot_initialize(inode);
 642         if (err) {
 643                 iput(inode);
 644                 goto err_out;
 645         }
 646
 647         clear_nlink(inode);
 648
 649         /* truncate all the data during iput */
 650         iput(inode);
 651
 652         err = f2fs_get_node_info(sbi, ino, &ni);
 653         if (err)
 654                 goto err_out;
 655
 656         /* ENOMEM was fully retried in f2fs_evict_inode. */
 657         if (ni.blk_addr != NULL_ADDR) {
 658                 err = -EIO;
 659                 goto err_out;
 660         }
 661         return 0;
 662
 663 err_out:
 664         set_sbi_flag(sbi, SBI_NEED_FSCK);
 665         f2fs_warn(sbi, "%s: orphan failed (ino=%x), run fsck to fix.",
 666                   __func__, ino);
 667         return err;
 668 }
 669
 670 int f2fs_recover_orphan_inodes(struct f2fs_sb_info *sbi)
 671 {
 672         block_t start_blk, orphan_blocks, i, j;
 673         unsigned int s_flags = sbi->sb->s_flags;
 674         int err = 0;
 675 #ifdef CONFIG_QUOTA
 676         int quota_enabled;
 677 #endif
 678
 679         if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG))
 680                 return 0;
 681
 682         if (bdev_read_only(sbi->sb->s_bdev)) {
 683                 f2fs_info(sbi, "write access unavailable, skipping orphan cleanup");
 684                 return 0;
 685         }
 686
 687         if (s_flags & SB_RDONLY) {
 688                 f2fs_info(sbi, "orphan cleanup on readonly fs");
 689                 sbi->sb->s_flags &= ~SB_RDONLY;
 690         }
 691
 692 #ifdef CONFIG_QUOTA
 693         /* Needed for iput() to work correctly and not trash data */
 694         sbi->sb->s_flags |= SB_ACTIVE;
 695
 696         /*
 697          * Turn on quotas which were not enabled for read-only mounts if
 698          * filesystem has quota feature, so that they are updated correctly.
 699          */
 700         quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
 701 #endif
 702
 703         start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
 704         orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
 705
 706         f2fs_ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
 707
 708         for (i = 0; i < orphan_blocks; i++) {
 709                 struct page *page;
 710                 struct f2fs_orphan_block *orphan_blk;
 711
 712                 page = f2fs_get_meta_page(sbi, start_blk + i);
 713                 if (IS_ERR(page)) {
 714                         err = PTR_ERR(page);
 715                         goto out;
 716                 }
 717
 718                 orphan_blk = (struct f2fs_orphan_block *)page_address(page);
 719                 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
 720                         nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
 721                         err = recover_orphan_inode(sbi, ino);
 722                         if (err) {
 723                                 f2fs_put_page(page, 1);
 724                                 goto out;
 725                         }
 726                 }
 727                 f2fs_put_page(page, 1);
 728         }
 729         /* clear Orphan Flag */
 730         clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG);
 731 out:
 732         set_sbi_flag(sbi, SBI_IS_RECOVERED);
 733
 734 #ifdef CONFIG_QUOTA
 735         /* Turn quotas off */
 736         if (quota_enabled)
 737                 f2fs_quota_off_umount(sbi->sb);
 738 #endif
 739         sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
 740
 741         return err;
 742 }
 743
 744 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
 745 {
 746         struct list_head *head;
 747         struct f2fs_orphan_block *orphan_blk = NULL;
 748         unsigned int nentries = 0;
 749         unsigned short index = 1;
 750         unsigned short orphan_blocks;
 751         struct page *page = NULL;
 752         struct ino_entry *orphan = NULL;
 753         struct inode_management *im = &sbi->im[ORPHAN_INO];
 754
 755         orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
 756
 757         /*
 758          * we don't need to do spin_lock(&im->ino_lock) here, since all the
 759          * orphan inode operations are covered under f2fs_lock_op().
 760          * And, spin_lock should be avoided due to page operations below.
 761          */
 762         head = &im->ino_list;
 763
 764         /* loop for each orphan inode entry and write them in Jornal block */
 765         list_for_each_entry(orphan, head, list) {
 766                 if (!page) {
 767                         page = f2fs_grab_meta_page(sbi, start_blk++);
 768                         orphan_blk =
 769                                 (struct f2fs_orphan_block *)page_address(page);
 770                         memset(orphan_blk, 0, sizeof(*orphan_blk));
 771                 }
 772
 773                 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
 774
 775                 if (nentries == F2FS_ORPHANS_PER_BLOCK) {
 776                         /*
 777                          * an orphan block is full of 1020 entries,
 778                          * then we need to flush current orphan blocks
 779                          * and bring another one in memory
 780                          */
 781                         orphan_blk->blk_addr = cpu_to_le16(index);
 782                         orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 783                         orphan_blk->entry_count = cpu_to_le32(nentries);
 784                         set_page_dirty(page);
 785                         f2fs_put_page(page, 1);
 786                         index++;
 787                         nentries = 0;
 788                         page = NULL;
 789                 }
 790         }
 791
 792         if (page) {
 793                 orphan_blk->blk_addr = cpu_to_le16(index);
 794                 orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
 795                 orphan_blk->entry_count = cpu_to_le32(nentries);
 796                 set_page_dirty(page);
 797                 f2fs_put_page(page, 1);
 798         }
 799 }
 800
 801 static __u32 f2fs_checkpoint_chksum(struct f2fs_sb_info *sbi,
 802                                                 struct f2fs_checkpoint *ckpt)
 803 {
 804         unsigned int chksum_ofs = le32_to_cpu(ckpt->checksum_offset);
 805         __u32 chksum;
 806
 807         chksum = f2fs_crc32(sbi, ckpt, chksum_ofs);
 808         if (chksum_ofs < CP_CHKSUM_OFFSET) {
 809                 chksum_ofs += sizeof(chksum);
 810                 chksum = f2fs_chksum(sbi, chksum, (__u8 *)ckpt + chksum_ofs,
 811                                                 F2FS_BLKSIZE - chksum_ofs);
 812         }
 813         return chksum;
 814 }
 815
 816 static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
 817                 struct f2fs_checkpoint **cp_block, struct page **cp_page,
 818                 unsigned long long *version)
 819 {
 820         size_t crc_offset = 0;
 821         __u32 crc;
 822
 823         *cp_page = f2fs_get_meta_page(sbi, cp_addr);
 824         if (IS_ERR(*cp_page))
 825                 return PTR_ERR(*cp_page);
 826
 827         *cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
 828
 829         crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
 830         if (crc_offset < CP_MIN_CHKSUM_OFFSET ||
 831                         crc_offset > CP_CHKSUM_OFFSET) {
 832                 f2fs_put_page(*cp_page, 1);
 833                 f2fs_warn(sbi, "invalid crc_offset: %zu", crc_offset);
 834                 return -EINVAL;
 835         }
 836
 837         crc = f2fs_checkpoint_chksum(sbi, *cp_block);
 838         if (crc != cur_cp_crc(*cp_block)) {
 839                 f2fs_put_page(*cp_page, 1);
 840                 f2fs_warn(sbi, "invalid crc value");
 841                 return -EINVAL;
 842         }
 843
 844         *version = cur_cp_version(*cp_block);
 845         return 0;
 846 }
 847
 848 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
 849                                 block_t cp_addr, unsigned long long *version)
 850 {
 851         struct page *cp_page_1 = NULL, *cp_page_2 = NULL;
 852         struct f2fs_checkpoint *cp_block = NULL;
 853         unsigned long long cur_version = 0, pre_version = 0;
 854         int err;
 855
 856         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 857                                         &cp_page_1, version);
 858         if (err)
 859                 return NULL;
 860
 861         if (le32_to_cpu(cp_block->cp_pack_total_block_count) >
 862                                         sbi->blocks_per_seg) {
 863                 f2fs_warn(sbi, "invalid cp_pack_total_block_count:%u",
 864                           le32_to_cpu(cp_block->cp_pack_total_block_count));
 865                 goto invalid_cp;
 866         }
 867         pre_version = *version;
 868
 869         cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
 870         err = get_checkpoint_version(sbi, cp_addr, &cp_block,
 871                                         &cp_page_2, version);
 872         if (err)
 873                 goto invalid_cp;
 874         cur_version = *version;
 875
 876         if (cur_version == pre_version) {
 877                 *version = cur_version;
 878                 f2fs_put_page(cp_page_2, 1);
 879                 return cp_page_1;
 880         }
 881         f2fs_put_page(cp_page_2, 1);
 882 invalid_cp:
 883         f2fs_put_page(cp_page_1, 1);
 884         return NULL;
 885 }
 886
 887 int f2fs_get_valid_checkpoint(struct f2fs_sb_info *sbi)
 888 {
 889         struct f2fs_checkpoint *cp_block;
 890         struct f2fs_super_block *fsb = sbi->raw_super;
 891         struct page *cp1, *cp2, *cur_page;
 892         unsigned long blk_size = sbi->blocksize;
 893         unsigned long long cp1_version = 0, cp2_version = 0;
 894         unsigned long long cp_start_blk_no;
 895         unsigned int cp_blks = 1 + __cp_payload(sbi);
 896         block_t cp_blk_no;
 897         int i;
 898         int err;
 899
 900         sbi->ckpt = f2fs_kvzalloc(sbi, array_size(blk_size, cp_blks),
 901                                   GFP_KERNEL);
 902         if (!sbi->ckpt)
 903                 return -ENOMEM;
 904         /*
 905          * Finding out valid cp block involves read both
 906          * sets( cp pack 1 and cp pack 2)
 907          */
 908         cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 909         cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 910
 911         /* The second checkpoint pack should start at the next segment */
 912         cp_start_blk_no += ((unsigned long long)1) <<
 913                                 le32_to_cpu(fsb->log_blocks_per_seg);
 914         cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 915
 916         if (cp1 && cp2) {
 917                 if (ver_after(cp2_version, cp1_version))
 918                         cur_page = cp2;
 919                 else
 920                         cur_page = cp1;
 921         } else if (cp1) {
 922                 cur_page = cp1;
 923         } else if (cp2) {
 924                 cur_page = cp2;
 925         } else {
 926                 err = -EFSCORRUPTED;
 927                 goto fail_no_cp;
 928         }
 929
 930         cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
 931         memcpy(sbi->ckpt, cp_block, blk_size);
 932
 933         if (cur_page == cp1)
 934                 sbi->cur_cp_pack = 1;
 935         else
 936                 sbi->cur_cp_pack = 2;
 937
 938         /* Sanity checking of checkpoint */
 939         if (f2fs_sanity_check_ckpt(sbi)) {
 940                 err = -EFSCORRUPTED;
 941                 goto free_fail_no_cp;
 942         }
 943
 944         if (cp_blks <= 1)
 945                 goto done;
 946
 947         cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
 948         if (cur_page == cp2)
 949                 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
 950
 951         for (i = 1; i < cp_blks; i++) {
 952                 void *sit_bitmap_ptr;
 953                 unsigned char *ckpt = (unsigned char *)sbi->ckpt;
 954
 955                 cur_page = f2fs_get_meta_page(sbi, cp_blk_no + i);
 956                 if (IS_ERR(cur_page)) {
 957                         err = PTR_ERR(cur_page);
 958                         goto free_fail_no_cp;
 959                 }
 960                 sit_bitmap_ptr = page_address(cur_page);
 961                 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
 962                 f2fs_put_page(cur_page, 1);
 963         }
 964 done:
 965         f2fs_put_page(cp1, 1);
 966         f2fs_put_page(cp2, 1);
 967         return 0;
 968
 969 free_fail_no_cp:
 970         f2fs_put_page(cp1, 1);
 971         f2fs_put_page(cp2, 1);
 972 fail_no_cp:
 973         kvfree(sbi->ckpt);
 974         return err;
 975 }
 976
 977 static void __add_dirty_inode(struct inode *inode, enum inode_type type)
 978 {
 979         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 980         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 981
 982         if (is_inode_flag_set(inode, flag))
 983                 return;
 984
 985         set_inode_flag(inode, flag);
 986         if (!f2fs_is_volatile_file(inode))
 987                 list_add_tail(&F2FS_I(inode)->dirty_list,
 988                                                 &sbi->inode_list[type]);
 989         stat_inc_dirty_inode(sbi, type);
 990 }
 991
 992 static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
 993 {
 994         int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
 995
 996         if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
 997                 return;
 998
 999         list_del_init(&F2FS_I(inode)->dirty_list);
1000         clear_inode_flag(inode, flag);
1001         stat_dec_dirty_inode(F2FS_I_SB(inode), type);
1002 }
1003
1004 void f2fs_update_dirty_page(struct inode *inode, struct page *page)
1005 {
1006         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1007         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
1008
1009         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
1010                         !S_ISLNK(inode->i_mode))
1011                 return;
1012
1013         spin_lock(&sbi->inode_lock[type]);
1014         if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
1015                 __add_dirty_inode(inode, type);
1016         inode_inc_dirty_pages(inode);
1017         spin_unlock(&sbi->inode_lock[type]);
1018
1019         f2fs_set_page_private(page, 0);
1020         f2fs_trace_pid(page);
1021 }
1022
1023 void f2fs_remove_dirty_inode(struct inode *inode)
1024 {
1025         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1026         enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
1027
1028         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
1029                         !S_ISLNK(inode->i_mode))
1030                 return;
1031
1032         if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
1033                 return;
1034
1035         spin_lock(&sbi->inode_lock[type]);
1036         __remove_dirty_inode(inode, type);
1037         spin_unlock(&sbi->inode_lock[type]);
1038 }
1039
1040 int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
1041 {
1042         struct list_head *head;
1043         struct inode *inode;
1044         struct f2fs_inode_info *fi;
1045         bool is_dir = (type == DIR_INODE);
1046         unsigned long ino = 0;
1047
1048         trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
1049                                 get_pages(sbi, is_dir ?
1050                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1051 retry:
1052         if (unlikely(f2fs_cp_error(sbi))) {
1053                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
1054                                 get_pages(sbi, is_dir ?
1055                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1056                 return -EIO;
1057         }
1058
1059         spin_lock(&sbi->inode_lock[type]);
1060
1061         head = &sbi->inode_list[type];
1062         if (list_empty(head)) {
1063                 spin_unlock(&sbi->inode_lock[type]);
1064                 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
1065                                 get_pages(sbi, is_dir ?
1066                                 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
1067                 return 0;
1068         }
1069         fi = list_first_entry(head, struct f2fs_inode_info, dirty_list);
1070         inode = igrab(&fi->vfs_inode);
1071         spin_unlock(&sbi->inode_lock[type]);
1072         if (inode) {
1073                 unsigned long cur_ino = inode->i_ino;
1074
1075                 F2FS_I(inode)->cp_task = current;
1076
1077                 filemap_fdatawrite(inode->i_mapping);
1078
1079                 F2FS_I(inode)->cp_task = NULL;
1080
1081                 iput(inode);
1082                 /* We need to give cpu to another writers. */
1083                 if (ino == cur_ino)
1084                         cond_resched();
1085                 else
1086                         ino = cur_ino;
1087         } else {
1088                 /*
1089                  * We should submit bio, since it exists several
1090                  * wribacking dentry pages in the freeing inode.
1091                  */
1092                 f2fs_submit_merged_write(sbi, DATA);
1093                 cond_resched();
1094         }
1095         goto retry;
1096 }
1097
1098 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
1099 {
1100         struct list_head *head = &sbi->inode_list[DIRTY_META];
1101         struct inode *inode;
1102         struct f2fs_inode_info *fi;
1103         s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
1104
1105         while (total--) {
1106                 if (unlikely(f2fs_cp_error(sbi)))
1107                         return -EIO;
1108
1109                 spin_lock(&sbi->inode_lock[DIRTY_META]);
1110                 if (list_empty(head)) {
1111                         spin_unlock(&sbi->inode_lock[DIRTY_META]);
1112                         return 0;
1113                 }
1114                 fi = list_first_entry(head, struct f2fs_inode_info,
1115                                                         gdirty_list);
1116                 inode = igrab(&fi->vfs_inode);
1117                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
1118                 if (inode) {
1119                         sync_inode_metadata(inode, 0);
1120
1121                         /* it's on eviction */
1122                         if (is_inode_flag_set(inode, FI_DIRTY_INODE))
1123                                 f2fs_update_inode_page(inode);
1124                         iput(inode);
1125                 }
1126         }
1127         return 0;
1128 }
1129
1130 static void __prepare_cp_block(struct f2fs_sb_info *sbi)
1131 {
1132         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1133         struct f2fs_nm_info *nm_i = NM_I(sbi);
1134         nid_t last_nid = nm_i->next_scan_nid;
1135
1136         next_free_nid(sbi, &last_nid);
1137         ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
1138         ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
1139         ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
1140         ckpt->next_free_nid = cpu_to_le32(last_nid);
1141 }
1142
1143 static bool __need_flush_quota(struct f2fs_sb_info *sbi)
1144 {
1145         bool ret = false;
1146
1147         if (!is_journalled_quota(sbi))
1148                 return false;
1149
1150         down_write(&sbi->quota_sem);
1151         if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH)) {
1152                 ret = false;
1153         } else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR)) {
1154                 ret = false;
1155         } else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_FLUSH)) {
1156                 clear_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
1157                 ret = true;
1158         } else if (get_pages(sbi, F2FS_DIRTY_QDATA)) {
1159                 ret = true;
1160         }
1161         up_write(&sbi->quota_sem);
1162         return ret;
1163 }
1164
1165 /*
1166  * Freeze all the FS-operations for checkpoint.
1167  */
1168 static int block_operations(struct f2fs_sb_info *sbi)
1169 {
1170         struct writeback_control wbc = {
1171                 .sync_mode = WB_SYNC_ALL,
1172                 .nr_to_write = LONG_MAX,
1173                 .for_reclaim = 0,
1174         };
1175         int err = 0, cnt = 0;
1176
1177         /*
1178          * Let's flush inline_data in dirty node pages.
1179          */
1180         f2fs_flush_inline_data(sbi);
1181
1182 retry_flush_quotas:
1183         f2fs_lock_all(sbi);
1184         if (__need_flush_quota(sbi)) {
1185                 int locked;
1186
1187                 if (++cnt > DEFAULT_RETRY_QUOTA_FLUSH_COUNT) {
1188                         set_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
1189                         set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
1190                         goto retry_flush_dents;
1191                 }
1192                 f2fs_unlock_all(sbi);
1193
1194                 /* only failed during mount/umount/freeze/quotactl */
1195                 locked = down_read_trylock(&sbi->sb->s_umount);
1196                 f2fs_quota_sync(sbi->sb, -1);
1197                 if (locked)
1198                         up_read(&sbi->sb->s_umount);
1199                 cond_resched();
1200                 goto retry_flush_quotas;
1201         }
1202
1203 retry_flush_dents:
1204         /* write all the dirty dentry pages */
1205         if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
1206                 f2fs_unlock_all(sbi);
1207                 err = f2fs_sync_dirty_inodes(sbi, DIR_INODE);
1208                 if (err)
1209                         return err;
1210                 cond_resched();
1211                 goto retry_flush_quotas;
1212         }
1213
1214         /*
1215          * POR: we should ensure that there are no dirty node pages
1216          * until finishing nat/sit flush. inode->i_blocks can be updated.
1217          */
1218         down_write(&sbi->node_change);
1219
1220         if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
1221                 up_write(&sbi->node_change);
1222                 f2fs_unlock_all(sbi);
1223                 err = f2fs_sync_inode_meta(sbi);
1224                 if (err)
1225                         return err;
1226                 cond_resched();
1227                 goto retry_flush_quotas;
1228         }
1229
1230 retry_flush_nodes:
1231         down_write(&sbi->node_write);
1232
1233         if (get_pages(sbi, F2FS_DIRTY_NODES)) {
1234                 up_write(&sbi->node_write);
1235                 atomic_inc(&sbi->wb_sync_req[NODE]);
1236                 err = f2fs_sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO);
1237                 atomic_dec(&sbi->wb_sync_req[NODE]);
1238                 if (err) {
1239                         up_write(&sbi->node_change);
1240                         f2fs_unlock_all(sbi);
1241                         return err;
1242                 }
1243                 cond_resched();
1244                 goto retry_flush_nodes;
1245         }
1246
1247         /*
1248          * sbi->node_change is used only for AIO write_begin path which produces
1249          * dirty node blocks and some checkpoint values by block allocation.
1250          */
1251         __prepare_cp_block(sbi);
1252         up_write(&sbi->node_change);
1253         return err;
1254 }
1255
1256 static void unblock_operations(struct f2fs_sb_info *sbi)
1257 {
1258         up_write(&sbi->node_write);
1259         f2fs_unlock_all(sbi);
1260 }
1261
1262 void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type)
1263 {
1264         DEFINE_WAIT(wait);
1265
1266         for (;;) {
1267                 if (!get_pages(sbi, type))
1268                         break;
1269
1270                 if (unlikely(f2fs_cp_error(sbi)))
1271                         break;
1272
1273                 if (type == F2FS_DIRTY_META)
1274                         f2fs_sync_meta_pages(sbi, META, LONG_MAX,
1275                                                         FS_CP_META_IO);
1276                 else if (type == F2FS_WB_CP_DATA)
1277                         f2fs_submit_merged_write(sbi, DATA);
1278
1279                 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
1280                 io_schedule_timeout(DEFAULT_IO_TIMEOUT);
1281         }
1282         finish_wait(&sbi->cp_wait, &wait);
1283 }
1284
1285 static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1286 {
1287         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
1288         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1289         unsigned long flags;
1290
1291         spin_lock_irqsave(&sbi->cp_lock, flags);
1292
1293         if ((cpc->reason & CP_UMOUNT) &&
1294                         le32_to_cpu(ckpt->cp_pack_total_block_count) >
1295                         sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks)
1296                 disable_nat_bits(sbi, false);
1297
1298         if (cpc->reason & CP_TRIMMED)
1299                 __set_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1300         else
1301                 __clear_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
1302
1303         if (cpc->reason & CP_UMOUNT)
1304                 __set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1305         else
1306                 __clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
1307
1308         if (cpc->reason & CP_FASTBOOT)
1309                 __set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1310         else
1311                 __clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
1312
1313         if (orphan_num)
1314                 __set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1315         else
1316                 __clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
1317
1318         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
1319                 __set_ckpt_flags(ckpt, CP_FSCK_FLAG);
1320
1321         if (is_sbi_flag_set(sbi, SBI_IS_RESIZEFS))
1322                 __set_ckpt_flags(ckpt, CP_RESIZEFS_FLAG);
1323         else
1324                 __clear_ckpt_flags(ckpt, CP_RESIZEFS_FLAG);
1325
1326         if (is_sbi_flag_set(sbi, SBI_CP_DISABLED))
1327                 __set_ckpt_flags(ckpt, CP_DISABLED_FLAG);
1328         else
1329                 __clear_ckpt_flags(ckpt, CP_DISABLED_FLAG);
1330
1331         if (is_sbi_flag_set(sbi, SBI_CP_DISABLED_QUICK))
1332                 __set_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
1333         else
1334                 __clear_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
1335
1336         if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH))
1337                 __set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
1338         else
1339                 __clear_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
1340
1341         if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR))
1342                 __set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
1343
1344         /* set this flag to activate crc|cp_ver for recovery */
1345         __set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
1346         __clear_ckpt_flags(ckpt, CP_NOCRC_RECOVERY_FLAG);
1347
1348         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1349 }
1350
1351 static void commit_checkpoint(struct f2fs_sb_info *sbi,
1352         void *src, block_t blk_addr)
1353 {
1354         struct writeback_control wbc = {
1355                 .for_reclaim = 0,
1356         };
1357
1358         /*
1359          * pagevec_lookup_tag and lock_page again will take
1360          * some extra time. Therefore, f2fs_update_meta_pages and
1361          * f2fs_sync_meta_pages are combined in this function.
1362          */
1363         struct page *page = f2fs_grab_meta_page(sbi, blk_addr);
1364         int err;
1365
1366         f2fs_wait_on_page_writeback(page, META, true, true);
1367
1368         memcpy(page_address(page), src, PAGE_SIZE);
1369
1370         set_page_dirty(page);
1371         if (unlikely(!clear_page_dirty_for_io(page)))
1372                 f2fs_bug_on(sbi, 1);
1373
1374         /* writeout cp pack 2 page */
1375         err = __f2fs_write_meta_page(page, &wbc, FS_CP_META_IO);
1376         if (unlikely(err && f2fs_cp_error(sbi))) {
1377                 f2fs_put_page(page, 1);
1378                 return;
1379         }
1380
1381         f2fs_bug_on(sbi, err);
1382         f2fs_put_page(page, 0);
1383
1384         /* submit checkpoint (with barrier if NOBARRIER is not set) */
1385         f2fs_submit_merged_write(sbi, META_FLUSH);
1386 }
1387
1388 static inline u64 get_sectors_written(struct block_device *bdev)
1389 {
1390         return (u64)part_stat_read(bdev, sectors[STAT_WRITE]);
1391 }
1392
1393 u64 f2fs_get_sectors_written(struct f2fs_sb_info *sbi)
1394 {
1395         if (f2fs_is_multi_device(sbi)) {
1396                 u64 sectors = 0;
1397                 int i;
1398
1399                 for (i = 0; i < sbi->s_ndevs; i++)
1400                         sectors += get_sectors_written(FDEV(i).bdev);
1401
1402                 return sectors;
1403         }
1404
1405         return get_sectors_written(sbi->sb->s_bdev);
1406 }
1407
1408 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1409 {
1410         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1411         struct f2fs_nm_info *nm_i = NM_I(sbi);
1412         unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num, flags;
1413         block_t start_blk;
1414         unsigned int data_sum_blocks, orphan_blocks;
1415         __u32 crc32 = 0;
1416         int i;
1417         int cp_payload_blks = __cp_payload(sbi);
1418         struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
1419         u64 kbytes_written;
1420         int err;
1421
1422         /* Flush all the NAT/SIT pages */
1423         f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1424
1425         /* start to update checkpoint, cp ver is already updated previously */
1426         ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi, true));
1427         ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
1428         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
1429                 ckpt->cur_node_segno[i] =
1430                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
1431                 ckpt->cur_node_blkoff[i] =
1432                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
1433                 ckpt->alloc_type[i + CURSEG_HOT_NODE] =
1434                                 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
1435         }
1436         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
1437                 ckpt->cur_data_segno[i] =
1438                         cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
1439                 ckpt->cur_data_blkoff[i] =
1440                         cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
1441                 ckpt->alloc_type[i + CURSEG_HOT_DATA] =
1442                                 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
1443         }
1444
1445         /* 2 cp + n data seg summary + orphan inode blocks */
1446         data_sum_blocks = f2fs_npages_for_summary_flush(sbi, false);
1447         spin_lock_irqsave(&sbi->cp_lock, flags);
1448         if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
1449                 __set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1450         else
1451                 __clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
1452         spin_unlock_irqrestore(&sbi->cp_lock, flags);
1453
1454         orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
1455         ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
1456                         orphan_blocks);
1457
1458         if (__remain_node_summaries(cpc->reason))
1459                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+
1460                                 cp_payload_blks + data_sum_blocks +
1461                                 orphan_blocks + NR_CURSEG_NODE_TYPE);
1462         else
1463                 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
1464                                 cp_payload_blks + data_sum_blocks +
1465                                 orphan_blocks);
1466
1467         /* update ckpt flag for checkpoint */
1468         update_ckpt_flags(sbi, cpc);
1469
1470         /* update SIT/NAT bitmap */
1471         get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
1472         get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
1473
1474         crc32 = f2fs_checkpoint_chksum(sbi, ckpt);
1475         *((__le32 *)((unsigned char *)ckpt +
1476                                 le32_to_cpu(ckpt->checksum_offset)))
1477                                 = cpu_to_le32(crc32);
1478
1479         start_blk = __start_cp_next_addr(sbi);
1480
1481         /* write nat bits */
1482         if (enabled_nat_bits(sbi, cpc)) {
1483                 __u64 cp_ver = cur_cp_version(ckpt);
1484                 block_t blk;
1485
1486                 cp_ver |= ((__u64)crc32 << 32);
1487                 *(__le64 *)nm_i->nat_bits = cpu_to_le64(cp_ver);
1488
1489                 blk = start_blk + sbi->blocks_per_seg - nm_i->nat_bits_blocks;
1490                 for (i = 0; i < nm_i->nat_bits_blocks; i++)
1491                         f2fs_update_meta_page(sbi, nm_i->nat_bits +
1492                                         (i << F2FS_BLKSIZE_BITS), blk + i);
1493         }
1494
1495         /* write out checkpoint buffer at block 0 */
1496         f2fs_update_meta_page(sbi, ckpt, start_blk++);
1497
1498         for (i = 1; i < 1 + cp_payload_blks; i++)
1499                 f2fs_update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
1500                                                         start_blk++);
1501
1502         if (orphan_num) {
1503                 write_orphan_inodes(sbi, start_blk);
1504                 start_blk += orphan_blocks;
1505         }
1506
1507         f2fs_write_data_summaries(sbi, start_blk);
1508         start_blk += data_sum_blocks;
1509
1510         /* Record write statistics in the hot node summary */
1511         kbytes_written = sbi->kbytes_written;
1512         kbytes_written += (f2fs_get_sectors_written(sbi) -
1513                                 sbi->sectors_written_start) >> 1;
1514         seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
1515
1516         if (__remain_node_summaries(cpc->reason)) {
1517                 f2fs_write_node_summaries(sbi, start_blk);
1518                 start_blk += NR_CURSEG_NODE_TYPE;
1519         }
1520
1521         /* update user_block_counts */
1522         sbi->last_valid_block_count = sbi->total_valid_block_count;
1523         percpu_counter_set(&sbi->alloc_valid_block_count, 0);
1524
1525         /* Here, we have one bio having CP pack except cp pack 2 page */
1526         f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
1527         /* Wait for all dirty meta pages to be submitted for IO */
1528         f2fs_wait_on_all_pages(sbi, F2FS_DIRTY_META);
1529
1530         /* wait for previous submitted meta pages writeback */
1531         f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA);
1532
1533         /* flush all device cache */
1534         err = f2fs_flush_device_cache(sbi);
1535         if (err)
1536                 return err;
1537
1538         /* barrier and flush checkpoint cp pack 2 page if it can */
1539         commit_checkpoint(sbi, ckpt, start_blk);
1540         f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA);
1541
1542         /*
1543          * invalidate intermediate page cache borrowed from meta inode which are
1544          * used for migration of encrypted, verity or compressed inode's blocks.
1545          */
1546         if (f2fs_sb_has_encrypt(sbi) || f2fs_sb_has_verity(sbi) ||
1547                 f2fs_sb_has_compression(sbi))
1548                 invalidate_mapping_pages(META_MAPPING(sbi),
1549                                 MAIN_BLKADDR(sbi), MAX_BLKADDR(sbi) - 1);
1550
1551         f2fs_release_ino_entry(sbi, false);
1552
1553         f2fs_reset_fsync_node_info(sbi);
1554
1555         clear_sbi_flag(sbi, SBI_IS_DIRTY);
1556         clear_sbi_flag(sbi, SBI_NEED_CP);
1557         clear_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
1558
1559         spin_lock(&sbi->stat_lock);
1560         sbi->unusable_block_count = 0;
1561         spin_unlock(&sbi->stat_lock);
1562
1563         __set_cp_next_pack(sbi);
1564
1565         /*
1566          * redirty superblock if metadata like node page or inode cache is
1567          * updated during writing checkpoint.
1568          */
1569         if (get_pages(sbi, F2FS_DIRTY_NODES) ||
1570                         get_pages(sbi, F2FS_DIRTY_IMETA))
1571                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1572
1573         f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS));
1574
1575         return unlikely(f2fs_cp_error(sbi)) ? -EIO : 0;
1576 }
1577
1578 int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
1579 {
1580         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1581         unsigned long long ckpt_ver;
1582         int err = 0;
1583
1584         if (f2fs_readonly(sbi->sb) || f2fs_hw_is_readonly(sbi))
1585                 return -EROFS;
1586
1587         if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
1588                 if (cpc->reason != CP_PAUSE)
1589                         return 0;
1590                 f2fs_warn(sbi, "Start checkpoint disabled!");
1591         }
1592         if (cpc->reason != CP_RESIZE)
1593                 down_write(&sbi->cp_global_sem);
1594
1595         if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
1596                 ((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) ||
1597                 ((cpc->reason & CP_DISCARD) && !sbi->discard_blks)))
1598                 goto out;
1599         if (unlikely(f2fs_cp_error(sbi))) {
1600                 err = -EIO;
1601                 goto out;
1602         }
1603
1604         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
1605
1606         err = block_operations(sbi);
1607         if (err)
1608                 goto out;
1609
1610         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
1611
1612         f2fs_flush_merged_writes(sbi);
1613
1614         /* this is the case of multiple fstrims without any changes */
1615         if (cpc->reason & CP_DISCARD) {
1616                 if (!f2fs_exist_trim_candidates(sbi, cpc)) {
1617                         unblock_operations(sbi);
1618                         goto out;
1619                 }
1620
1621                 if (NM_I(sbi)->nat_cnt[DIRTY_NAT] == 0 &&
1622                                 SIT_I(sbi)->dirty_sentries == 0 &&
1623                                 prefree_segments(sbi) == 0) {
1624                         f2fs_flush_sit_entries(sbi, cpc);
1625                         f2fs_clear_prefree_segments(sbi, cpc);
1626                         unblock_operations(sbi);
1627                         goto out;
1628                 }
1629         }
1630
1631         /*
1632          * update checkpoint pack index
1633          * Increase the version number so that
1634          * SIT entries and seg summaries are written at correct place
1635          */
1636         ckpt_ver = cur_cp_version(ckpt);
1637         ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
1638
1639         /* write cached NAT/SIT entries to NAT/SIT area */
1640         err = f2fs_flush_nat_entries(sbi, cpc);
1641         if (err)
1642                 goto stop;
1643
1644         f2fs_flush_sit_entries(sbi, cpc);
1645
1646         /* save inmem log status */
1647         f2fs_save_inmem_curseg(sbi);
1648
1649         err = do_checkpoint(sbi, cpc);
1650         if (err)
1651                 f2fs_release_discard_addrs(sbi);
1652         else
1653                 f2fs_clear_prefree_segments(sbi, cpc);
1654
1655         f2fs_restore_inmem_curseg(sbi);
1656 stop:
1657         unblock_operations(sbi);
1658         stat_inc_cp_count(sbi->stat_info);
1659
1660         if (cpc->reason & CP_RECOVERY)
1661                 f2fs_notice(sbi, "checkpoint: version = %llx", ckpt_ver);
1662
1663         /* update CP_TIME to trigger checkpoint periodically */
1664         f2fs_update_time(sbi, CP_TIME);
1665         trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
1666 out:
1667         if (cpc->reason != CP_RESIZE)
1668                 up_write(&sbi->cp_global_sem);
1669         return err;
1670 }
1671
1672 void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi)
1673 {
1674         int i;
1675
1676         for (i = 0; i < MAX_INO_ENTRY; i++) {
1677                 struct inode_management *im = &sbi->im[i];
1678
1679                 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
1680                 spin_lock_init(&im->ino_lock);
1681                 INIT_LIST_HEAD(&im->ino_list);
1682                 im->ino_num = 0;
1683         }
1684
1685         sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
1686                         NR_CURSEG_PERSIST_TYPE - __cp_payload(sbi)) *
1687                                 F2FS_ORPHANS_PER_BLOCK;
1688 }
1689
1690 int __init f2fs_create_checkpoint_caches(void)
1691 {
1692         ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
1693                         sizeof(struct ino_entry));
1694         if (!ino_entry_slab)
1695                 return -ENOMEM;
1696         f2fs_inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
1697                         sizeof(struct inode_entry));
1698         if (!f2fs_inode_entry_slab) {
1699                 kmem_cache_destroy(ino_entry_slab);
1700                 return -ENOMEM;
1701         }
1702         return 0;
1703 }
1704
1705 void f2fs_destroy_checkpoint_caches(void)
1706 {
1707         kmem_cache_destroy(ino_entry_slab);
1708         kmem_cache_destroy(f2fs_inode_entry_slab);
1709 }