1 /* 2 * fs/f2fs/checkpoint.c 3 * 4 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #include <linux/fs.h> 12 #include <linux/bio.h> 13 #include <linux/mpage.h> 14 #include <linux/writeback.h> 15 #include <linux/blkdev.h> 16 #include <linux/f2fs_fs.h> 17 #include <linux/pagevec.h> 18 #include <linux/swap.h> 19 20 #include "f2fs.h" 21 #include "node.h" 22 #include "segment.h" 23 #include "trace.h" 24 #include <trace/events/f2fs.h> 25 26 static struct kmem_cache *ino_entry_slab; 27 struct kmem_cache *inode_entry_slab; 28 29 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io) 30 { 31 set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG); 32 sbi->sb->s_flags |= MS_RDONLY; 33 if (!end_io) 34 f2fs_flush_merged_bios(sbi); 35 } 36 37 /* 38 * We guarantee no failure on the returned page. 39 */ 40 struct page *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 SetPageUptodate(page); 52 return page; 53 } 54 55 /* 56 * We guarantee no failure on the returned page. 57 */ 58 static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index, 59 bool is_meta) 60 { 61 struct address_space *mapping = META_MAPPING(sbi); 62 struct page *page; 63 struct f2fs_io_info fio = { 64 .sbi = sbi, 65 .type = META, 66 .op = REQ_OP_READ, 67 .op_flags = READ_SYNC | REQ_META | REQ_PRIO, 68 .old_blkaddr = index, 69 .new_blkaddr = index, 70 .encrypted_page = NULL, 71 }; 72 73 if (unlikely(!is_meta)) 74 fio.op_flags &= ~REQ_META; 75 repeat: 76 page = f2fs_grab_cache_page(mapping, index, false); 77 if (!page) { 78 cond_resched(); 79 goto repeat; 80 } 81 if (PageUptodate(page)) 82 goto out; 83 84 fio.page = page; 85 86 if (f2fs_submit_page_bio(&fio)) { 87 f2fs_put_page(page, 1); 88 goto repeat; 89 } 90 91 lock_page(page); 92 if (unlikely(page->mapping != mapping)) { 93 f2fs_put_page(page, 1); 94 goto repeat; 95 } 96 97 /* 98 * if there is any IO error when accessing device, make our filesystem 99 * readonly and make sure do not write checkpoint with non-uptodate 100 * meta page. 101 */ 102 if (unlikely(!PageUptodate(page))) 103 f2fs_stop_checkpoint(sbi, false); 104 out: 105 return page; 106 } 107 108 struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index) 109 { 110 return __get_meta_page(sbi, index, true); 111 } 112 113 /* for POR only */ 114 struct page *get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index) 115 { 116 return __get_meta_page(sbi, index, false); 117 } 118 119 bool is_valid_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type) 120 { 121 switch (type) { 122 case META_NAT: 123 break; 124 case META_SIT: 125 if (unlikely(blkaddr >= SIT_BLK_CNT(sbi))) 126 return false; 127 break; 128 case META_SSA: 129 if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) || 130 blkaddr < SM_I(sbi)->ssa_blkaddr)) 131 return false; 132 break; 133 case META_CP: 134 if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr || 135 blkaddr < __start_cp_addr(sbi))) 136 return false; 137 break; 138 case META_POR: 139 if (unlikely(blkaddr >= MAX_BLKADDR(sbi) || 140 blkaddr < MAIN_BLKADDR(sbi))) 141 return false; 142 break; 143 default: 144 BUG(); 145 } 146 147 return true; 148 } 149 150 /* 151 * Readahead CP/NAT/SIT/SSA pages 152 */ 153 int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, 154 int type, bool sync) 155 { 156 struct page *page; 157 block_t blkno = start; 158 struct f2fs_io_info fio = { 159 .sbi = sbi, 160 .type = META, 161 .op = REQ_OP_READ, 162 .op_flags = sync ? (READ_SYNC | REQ_META | REQ_PRIO) : READA, 163 .encrypted_page = NULL, 164 }; 165 struct blk_plug plug; 166 167 if (unlikely(type == META_POR)) 168 fio.op_flags &= ~REQ_META; 169 170 blk_start_plug(&plug); 171 for (; nrpages-- > 0; blkno++) { 172 173 if (!is_valid_blkaddr(sbi, blkno, type)) 174 goto out; 175 176 switch (type) { 177 case META_NAT: 178 if (unlikely(blkno >= 179 NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid))) 180 blkno = 0; 181 /* get nat block addr */ 182 fio.new_blkaddr = current_nat_addr(sbi, 183 blkno * NAT_ENTRY_PER_BLOCK); 184 break; 185 case META_SIT: 186 /* get sit block addr */ 187 fio.new_blkaddr = current_sit_addr(sbi, 188 blkno * SIT_ENTRY_PER_BLOCK); 189 break; 190 case META_SSA: 191 case META_CP: 192 case META_POR: 193 fio.new_blkaddr = blkno; 194 break; 195 default: 196 BUG(); 197 } 198 199 page = f2fs_grab_cache_page(META_MAPPING(sbi), 200 fio.new_blkaddr, false); 201 if (!page) 202 continue; 203 if (PageUptodate(page)) { 204 f2fs_put_page(page, 1); 205 continue; 206 } 207 208 fio.page = page; 209 fio.old_blkaddr = fio.new_blkaddr; 210 f2fs_submit_page_mbio(&fio); 211 f2fs_put_page(page, 0); 212 } 213 out: 214 f2fs_submit_merged_bio(sbi, META, READ); 215 blk_finish_plug(&plug); 216 return blkno - start; 217 } 218 219 void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index) 220 { 221 struct page *page; 222 bool readahead = false; 223 224 page = find_get_page(META_MAPPING(sbi), index); 225 if (!page || !PageUptodate(page)) 226 readahead = true; 227 f2fs_put_page(page, 0); 228 229 if (readahead) 230 ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR, true); 231 } 232 233 static int f2fs_write_meta_page(struct page *page, 234 struct writeback_control *wbc) 235 { 236 struct f2fs_sb_info *sbi = F2FS_P_SB(page); 237 238 trace_f2fs_writepage(page, META); 239 240 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) 241 goto redirty_out; 242 if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0)) 243 goto redirty_out; 244 if (unlikely(f2fs_cp_error(sbi))) 245 goto redirty_out; 246 247 write_meta_page(sbi, page); 248 dec_page_count(sbi, F2FS_DIRTY_META); 249 250 if (wbc->for_reclaim) 251 f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, META, WRITE); 252 253 unlock_page(page); 254 255 if (unlikely(f2fs_cp_error(sbi))) 256 f2fs_submit_merged_bio(sbi, META, WRITE); 257 258 return 0; 259 260 redirty_out: 261 redirty_page_for_writepage(wbc, page); 262 return AOP_WRITEPAGE_ACTIVATE; 263 } 264 265 static int f2fs_write_meta_pages(struct address_space *mapping, 266 struct writeback_control *wbc) 267 { 268 struct f2fs_sb_info *sbi = F2FS_M_SB(mapping); 269 long diff, written; 270 271 /* collect a number of dirty meta pages and write together */ 272 if (wbc->for_kupdate || 273 get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META)) 274 goto skip_write; 275 276 trace_f2fs_writepages(mapping->host, wbc, META); 277 278 /* if mounting is failed, skip writing node pages */ 279 mutex_lock(&sbi->cp_mutex); 280 diff = nr_pages_to_write(sbi, META, wbc); 281 written = sync_meta_pages(sbi, META, wbc->nr_to_write); 282 mutex_unlock(&sbi->cp_mutex); 283 wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff); 284 return 0; 285 286 skip_write: 287 wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META); 288 trace_f2fs_writepages(mapping->host, wbc, META); 289 return 0; 290 } 291 292 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type, 293 long nr_to_write) 294 { 295 struct address_space *mapping = META_MAPPING(sbi); 296 pgoff_t index = 0, end = ULONG_MAX, prev = ULONG_MAX; 297 struct pagevec pvec; 298 long nwritten = 0; 299 struct writeback_control wbc = { 300 .for_reclaim = 0, 301 }; 302 struct blk_plug plug; 303 304 pagevec_init(&pvec, 0); 305 306 blk_start_plug(&plug); 307 308 while (index <= end) { 309 int i, nr_pages; 310 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, 311 PAGECACHE_TAG_DIRTY, 312 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); 313 if (unlikely(nr_pages == 0)) 314 break; 315 316 for (i = 0; i < nr_pages; i++) { 317 struct page *page = pvec.pages[i]; 318 319 if (prev == ULONG_MAX) 320 prev = page->index - 1; 321 if (nr_to_write != LONG_MAX && page->index != prev + 1) { 322 pagevec_release(&pvec); 323 goto stop; 324 } 325 326 lock_page(page); 327 328 if (unlikely(page->mapping != mapping)) { 329 continue_unlock: 330 unlock_page(page); 331 continue; 332 } 333 if (!PageDirty(page)) { 334 /* someone wrote it for us */ 335 goto continue_unlock; 336 } 337 338 f2fs_wait_on_page_writeback(page, META, true); 339 340 BUG_ON(PageWriteback(page)); 341 if (!clear_page_dirty_for_io(page)) 342 goto continue_unlock; 343 344 if (mapping->a_ops->writepage(page, &wbc)) { 345 unlock_page(page); 346 break; 347 } 348 nwritten++; 349 prev = page->index; 350 if (unlikely(nwritten >= nr_to_write)) 351 break; 352 } 353 pagevec_release(&pvec); 354 cond_resched(); 355 } 356 stop: 357 if (nwritten) 358 f2fs_submit_merged_bio(sbi, type, WRITE); 359 360 blk_finish_plug(&plug); 361 362 return nwritten; 363 } 364 365 static int f2fs_set_meta_page_dirty(struct page *page) 366 { 367 trace_f2fs_set_page_dirty(page, META); 368 369 SetPageUptodate(page); 370 if (!PageDirty(page)) { 371 __set_page_dirty_nobuffers(page); 372 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META); 373 SetPagePrivate(page); 374 f2fs_trace_pid(page); 375 return 1; 376 } 377 return 0; 378 } 379 380 const struct address_space_operations f2fs_meta_aops = { 381 .writepage = f2fs_write_meta_page, 382 .writepages = f2fs_write_meta_pages, 383 .set_page_dirty = f2fs_set_meta_page_dirty, 384 .invalidatepage = f2fs_invalidate_page, 385 .releasepage = f2fs_release_page, 386 }; 387 388 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type) 389 { 390 struct inode_management *im = &sbi->im[type]; 391 struct ino_entry *e, *tmp; 392 393 tmp = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_NOFS); 394 retry: 395 radix_tree_preload(GFP_NOFS | __GFP_NOFAIL); 396 397 spin_lock(&im->ino_lock); 398 e = radix_tree_lookup(&im->ino_root, ino); 399 if (!e) { 400 e = tmp; 401 if (radix_tree_insert(&im->ino_root, ino, e)) { 402 spin_unlock(&im->ino_lock); 403 radix_tree_preload_end(); 404 goto retry; 405 } 406 memset(e, 0, sizeof(struct ino_entry)); 407 e->ino = ino; 408 409 list_add_tail(&e->list, &im->ino_list); 410 if (type != ORPHAN_INO) 411 im->ino_num++; 412 } 413 spin_unlock(&im->ino_lock); 414 radix_tree_preload_end(); 415 416 if (e != tmp) 417 kmem_cache_free(ino_entry_slab, tmp); 418 } 419 420 static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type) 421 { 422 struct inode_management *im = &sbi->im[type]; 423 struct ino_entry *e; 424 425 spin_lock(&im->ino_lock); 426 e = radix_tree_lookup(&im->ino_root, ino); 427 if (e) { 428 list_del(&e->list); 429 radix_tree_delete(&im->ino_root, ino); 430 im->ino_num--; 431 spin_unlock(&im->ino_lock); 432 kmem_cache_free(ino_entry_slab, e); 433 return; 434 } 435 spin_unlock(&im->ino_lock); 436 } 437 438 void add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type) 439 { 440 /* add new dirty ino entry into list */ 441 __add_ino_entry(sbi, ino, type); 442 } 443 444 void remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type) 445 { 446 /* remove dirty ino entry from list */ 447 __remove_ino_entry(sbi, ino, type); 448 } 449 450 /* mode should be APPEND_INO or UPDATE_INO */ 451 bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode) 452 { 453 struct inode_management *im = &sbi->im[mode]; 454 struct ino_entry *e; 455 456 spin_lock(&im->ino_lock); 457 e = radix_tree_lookup(&im->ino_root, ino); 458 spin_unlock(&im->ino_lock); 459 return e ? true : false; 460 } 461 462 void release_ino_entry(struct f2fs_sb_info *sbi, bool all) 463 { 464 struct ino_entry *e, *tmp; 465 int i; 466 467 for (i = all ? ORPHAN_INO: APPEND_INO; i <= UPDATE_INO; i++) { 468 struct inode_management *im = &sbi->im[i]; 469 470 spin_lock(&im->ino_lock); 471 list_for_each_entry_safe(e, tmp, &im->ino_list, list) { 472 list_del(&e->list); 473 radix_tree_delete(&im->ino_root, e->ino); 474 kmem_cache_free(ino_entry_slab, e); 475 im->ino_num--; 476 } 477 spin_unlock(&im->ino_lock); 478 } 479 } 480 481 int acquire_orphan_inode(struct f2fs_sb_info *sbi) 482 { 483 struct inode_management *im = &sbi->im[ORPHAN_INO]; 484 int err = 0; 485 486 spin_lock(&im->ino_lock); 487 488 #ifdef CONFIG_F2FS_FAULT_INJECTION 489 if (time_to_inject(FAULT_ORPHAN)) { 490 spin_unlock(&im->ino_lock); 491 return -ENOSPC; 492 } 493 #endif 494 if (unlikely(im->ino_num >= sbi->max_orphans)) 495 err = -ENOSPC; 496 else 497 im->ino_num++; 498 spin_unlock(&im->ino_lock); 499 500 return err; 501 } 502 503 void release_orphan_inode(struct f2fs_sb_info *sbi) 504 { 505 struct inode_management *im = &sbi->im[ORPHAN_INO]; 506 507 spin_lock(&im->ino_lock); 508 f2fs_bug_on(sbi, im->ino_num == 0); 509 im->ino_num--; 510 spin_unlock(&im->ino_lock); 511 } 512 513 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) 514 { 515 /* add new orphan ino entry into list */ 516 __add_ino_entry(sbi, ino, ORPHAN_INO); 517 } 518 519 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) 520 { 521 /* remove orphan entry from orphan list */ 522 __remove_ino_entry(sbi, ino, ORPHAN_INO); 523 } 524 525 static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) 526 { 527 struct inode *inode; 528 529 inode = f2fs_iget(sbi->sb, ino); 530 if (IS_ERR(inode)) { 531 /* 532 * there should be a bug that we can't find the entry 533 * to orphan inode. 534 */ 535 f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT); 536 return PTR_ERR(inode); 537 } 538 539 clear_nlink(inode); 540 541 /* truncate all the data during iput */ 542 iput(inode); 543 return 0; 544 } 545 546 int recover_orphan_inodes(struct f2fs_sb_info *sbi) 547 { 548 block_t start_blk, orphan_blocks, i, j; 549 int err; 550 551 if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG)) 552 return 0; 553 554 start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi); 555 orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi); 556 557 ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true); 558 559 for (i = 0; i < orphan_blocks; i++) { 560 struct page *page = get_meta_page(sbi, start_blk + i); 561 struct f2fs_orphan_block *orphan_blk; 562 563 orphan_blk = (struct f2fs_orphan_block *)page_address(page); 564 for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) { 565 nid_t ino = le32_to_cpu(orphan_blk->ino[j]); 566 err = recover_orphan_inode(sbi, ino); 567 if (err) { 568 f2fs_put_page(page, 1); 569 return err; 570 } 571 } 572 f2fs_put_page(page, 1); 573 } 574 /* clear Orphan Flag */ 575 clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG); 576 return 0; 577 } 578 579 static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk) 580 { 581 struct list_head *head; 582 struct f2fs_orphan_block *orphan_blk = NULL; 583 unsigned int nentries = 0; 584 unsigned short index = 1; 585 unsigned short orphan_blocks; 586 struct page *page = NULL; 587 struct ino_entry *orphan = NULL; 588 struct inode_management *im = &sbi->im[ORPHAN_INO]; 589 590 orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num); 591 592 /* 593 * we don't need to do spin_lock(&im->ino_lock) here, since all the 594 * orphan inode operations are covered under f2fs_lock_op(). 595 * And, spin_lock should be avoided due to page operations below. 596 */ 597 head = &im->ino_list; 598 599 /* loop for each orphan inode entry and write them in Jornal block */ 600 list_for_each_entry(orphan, head, list) { 601 if (!page) { 602 page = grab_meta_page(sbi, start_blk++); 603 orphan_blk = 604 (struct f2fs_orphan_block *)page_address(page); 605 memset(orphan_blk, 0, sizeof(*orphan_blk)); 606 } 607 608 orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino); 609 610 if (nentries == F2FS_ORPHANS_PER_BLOCK) { 611 /* 612 * an orphan block is full of 1020 entries, 613 * then we need to flush current orphan blocks 614 * and bring another one in memory 615 */ 616 orphan_blk->blk_addr = cpu_to_le16(index); 617 orphan_blk->blk_count = cpu_to_le16(orphan_blocks); 618 orphan_blk->entry_count = cpu_to_le32(nentries); 619 set_page_dirty(page); 620 f2fs_put_page(page, 1); 621 index++; 622 nentries = 0; 623 page = NULL; 624 } 625 } 626 627 if (page) { 628 orphan_blk->blk_addr = cpu_to_le16(index); 629 orphan_blk->blk_count = cpu_to_le16(orphan_blocks); 630 orphan_blk->entry_count = cpu_to_le32(nentries); 631 set_page_dirty(page); 632 f2fs_put_page(page, 1); 633 } 634 } 635 636 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi, 637 block_t cp_addr, unsigned long long *version) 638 { 639 struct page *cp_page_1, *cp_page_2 = NULL; 640 unsigned long blk_size = sbi->blocksize; 641 struct f2fs_checkpoint *cp_block; 642 unsigned long long cur_version = 0, pre_version = 0; 643 size_t crc_offset; 644 __u32 crc = 0; 645 646 /* Read the 1st cp block in this CP pack */ 647 cp_page_1 = get_meta_page(sbi, cp_addr); 648 649 /* get the version number */ 650 cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1); 651 crc_offset = le32_to_cpu(cp_block->checksum_offset); 652 if (crc_offset >= blk_size) 653 goto invalid_cp1; 654 655 crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset))); 656 if (!f2fs_crc_valid(sbi, crc, cp_block, crc_offset)) 657 goto invalid_cp1; 658 659 pre_version = cur_cp_version(cp_block); 660 661 /* Read the 2nd cp block in this CP pack */ 662 cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1; 663 cp_page_2 = get_meta_page(sbi, cp_addr); 664 665 cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2); 666 crc_offset = le32_to_cpu(cp_block->checksum_offset); 667 if (crc_offset >= blk_size) 668 goto invalid_cp2; 669 670 crc = le32_to_cpu(*((__le32 *)((unsigned char *)cp_block + crc_offset))); 671 if (!f2fs_crc_valid(sbi, crc, cp_block, crc_offset)) 672 goto invalid_cp2; 673 674 cur_version = cur_cp_version(cp_block); 675 676 if (cur_version == pre_version) { 677 *version = cur_version; 678 f2fs_put_page(cp_page_2, 1); 679 return cp_page_1; 680 } 681 invalid_cp2: 682 f2fs_put_page(cp_page_2, 1); 683 invalid_cp1: 684 f2fs_put_page(cp_page_1, 1); 685 return NULL; 686 } 687 688 int get_valid_checkpoint(struct f2fs_sb_info *sbi) 689 { 690 struct f2fs_checkpoint *cp_block; 691 struct f2fs_super_block *fsb = sbi->raw_super; 692 struct page *cp1, *cp2, *cur_page; 693 unsigned long blk_size = sbi->blocksize; 694 unsigned long long cp1_version = 0, cp2_version = 0; 695 unsigned long long cp_start_blk_no; 696 unsigned int cp_blks = 1 + __cp_payload(sbi); 697 block_t cp_blk_no; 698 int i; 699 700 sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL); 701 if (!sbi->ckpt) 702 return -ENOMEM; 703 /* 704 * Finding out valid cp block involves read both 705 * sets( cp pack1 and cp pack 2) 706 */ 707 cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr); 708 cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version); 709 710 /* The second checkpoint pack should start at the next segment */ 711 cp_start_blk_no += ((unsigned long long)1) << 712 le32_to_cpu(fsb->log_blocks_per_seg); 713 cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version); 714 715 if (cp1 && cp2) { 716 if (ver_after(cp2_version, cp1_version)) 717 cur_page = cp2; 718 else 719 cur_page = cp1; 720 } else if (cp1) { 721 cur_page = cp1; 722 } else if (cp2) { 723 cur_page = cp2; 724 } else { 725 goto fail_no_cp; 726 } 727 728 cp_block = (struct f2fs_checkpoint *)page_address(cur_page); 729 memcpy(sbi->ckpt, cp_block, blk_size); 730 731 /* Sanity checking of checkpoint */ 732 if (sanity_check_ckpt(sbi)) 733 goto fail_no_cp; 734 735 if (cp_blks <= 1) 736 goto done; 737 738 cp_blk_no = le32_to_cpu(fsb->cp_blkaddr); 739 if (cur_page == cp2) 740 cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg); 741 742 for (i = 1; i < cp_blks; i++) { 743 void *sit_bitmap_ptr; 744 unsigned char *ckpt = (unsigned char *)sbi->ckpt; 745 746 cur_page = get_meta_page(sbi, cp_blk_no + i); 747 sit_bitmap_ptr = page_address(cur_page); 748 memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size); 749 f2fs_put_page(cur_page, 1); 750 } 751 done: 752 f2fs_put_page(cp1, 1); 753 f2fs_put_page(cp2, 1); 754 return 0; 755 756 fail_no_cp: 757 kfree(sbi->ckpt); 758 return -EINVAL; 759 } 760 761 static void __add_dirty_inode(struct inode *inode, enum inode_type type) 762 { 763 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 764 struct f2fs_inode_info *fi = F2FS_I(inode); 765 int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE; 766 767 if (is_inode_flag_set(fi, flag)) 768 return; 769 770 set_inode_flag(fi, flag); 771 list_add_tail(&fi->dirty_list, &sbi->inode_list[type]); 772 stat_inc_dirty_inode(sbi, type); 773 } 774 775 static void __remove_dirty_inode(struct inode *inode, enum inode_type type) 776 { 777 struct f2fs_inode_info *fi = F2FS_I(inode); 778 int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE; 779 780 if (get_dirty_pages(inode) || 781 !is_inode_flag_set(F2FS_I(inode), flag)) 782 return; 783 784 list_del_init(&fi->dirty_list); 785 clear_inode_flag(fi, flag); 786 stat_dec_dirty_inode(F2FS_I_SB(inode), type); 787 } 788 789 void update_dirty_page(struct inode *inode, struct page *page) 790 { 791 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 792 enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE; 793 794 if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) && 795 !S_ISLNK(inode->i_mode)) 796 return; 797 798 if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH)) { 799 spin_lock(&sbi->inode_lock[type]); 800 __add_dirty_inode(inode, type); 801 spin_unlock(&sbi->inode_lock[type]); 802 } 803 804 inode_inc_dirty_pages(inode); 805 SetPagePrivate(page); 806 f2fs_trace_pid(page); 807 } 808 809 void remove_dirty_inode(struct inode *inode) 810 { 811 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 812 enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE; 813 814 if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) && 815 !S_ISLNK(inode->i_mode)) 816 return; 817 818 if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH)) 819 return; 820 821 spin_lock(&sbi->inode_lock[type]); 822 __remove_dirty_inode(inode, type); 823 spin_unlock(&sbi->inode_lock[type]); 824 } 825 826 int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type) 827 { 828 struct list_head *head; 829 struct inode *inode; 830 struct f2fs_inode_info *fi; 831 bool is_dir = (type == DIR_INODE); 832 833 trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir, 834 get_pages(sbi, is_dir ? 835 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA)); 836 retry: 837 if (unlikely(f2fs_cp_error(sbi))) 838 return -EIO; 839 840 spin_lock(&sbi->inode_lock[type]); 841 842 head = &sbi->inode_list[type]; 843 if (list_empty(head)) { 844 spin_unlock(&sbi->inode_lock[type]); 845 trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir, 846 get_pages(sbi, is_dir ? 847 F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA)); 848 return 0; 849 } 850 fi = list_entry(head->next, struct f2fs_inode_info, dirty_list); 851 inode = igrab(&fi->vfs_inode); 852 spin_unlock(&sbi->inode_lock[type]); 853 if (inode) { 854 filemap_fdatawrite(inode->i_mapping); 855 iput(inode); 856 } else { 857 /* 858 * We should submit bio, since it exists several 859 * wribacking dentry pages in the freeing inode. 860 */ 861 f2fs_submit_merged_bio(sbi, DATA, WRITE); 862 cond_resched(); 863 } 864 goto retry; 865 } 866 867 /* 868 * Freeze all the FS-operations for checkpoint. 869 */ 870 static int block_operations(struct f2fs_sb_info *sbi) 871 { 872 struct writeback_control wbc = { 873 .sync_mode = WB_SYNC_ALL, 874 .nr_to_write = LONG_MAX, 875 .for_reclaim = 0, 876 }; 877 struct blk_plug plug; 878 int err = 0; 879 880 blk_start_plug(&plug); 881 882 retry_flush_dents: 883 f2fs_lock_all(sbi); 884 /* write all the dirty dentry pages */ 885 if (get_pages(sbi, F2FS_DIRTY_DENTS)) { 886 f2fs_unlock_all(sbi); 887 err = sync_dirty_inodes(sbi, DIR_INODE); 888 if (err) 889 goto out; 890 goto retry_flush_dents; 891 } 892 893 /* 894 * POR: we should ensure that there are no dirty node pages 895 * until finishing nat/sit flush. 896 */ 897 retry_flush_nodes: 898 down_write(&sbi->node_write); 899 900 if (get_pages(sbi, F2FS_DIRTY_NODES)) { 901 up_write(&sbi->node_write); 902 err = sync_node_pages(sbi, &wbc); 903 if (err) { 904 f2fs_unlock_all(sbi); 905 goto out; 906 } 907 goto retry_flush_nodes; 908 } 909 out: 910 blk_finish_plug(&plug); 911 return err; 912 } 913 914 static void unblock_operations(struct f2fs_sb_info *sbi) 915 { 916 up_write(&sbi->node_write); 917 f2fs_unlock_all(sbi); 918 } 919 920 static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi) 921 { 922 DEFINE_WAIT(wait); 923 924 for (;;) { 925 prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE); 926 927 if (!atomic_read(&sbi->nr_wb_bios)) 928 break; 929 930 io_schedule_timeout(5*HZ); 931 } 932 finish_wait(&sbi->cp_wait, &wait); 933 } 934 935 static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) 936 { 937 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); 938 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); 939 struct f2fs_nm_info *nm_i = NM_I(sbi); 940 unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num; 941 nid_t last_nid = nm_i->next_scan_nid; 942 block_t start_blk; 943 unsigned int data_sum_blocks, orphan_blocks; 944 __u32 crc32 = 0; 945 int i; 946 int cp_payload_blks = __cp_payload(sbi); 947 block_t discard_blk = NEXT_FREE_BLKADDR(sbi, curseg); 948 bool invalidate = false; 949 struct super_block *sb = sbi->sb; 950 struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE); 951 u64 kbytes_written; 952 953 /* 954 * This avoids to conduct wrong roll-forward operations and uses 955 * metapages, so should be called prior to sync_meta_pages below. 956 */ 957 if (discard_next_dnode(sbi, discard_blk)) 958 invalidate = true; 959 960 /* Flush all the NAT/SIT pages */ 961 while (get_pages(sbi, F2FS_DIRTY_META)) { 962 sync_meta_pages(sbi, META, LONG_MAX); 963 if (unlikely(f2fs_cp_error(sbi))) 964 return -EIO; 965 } 966 967 next_free_nid(sbi, &last_nid); 968 969 /* 970 * modify checkpoint 971 * version number is already updated 972 */ 973 ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi)); 974 ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi)); 975 ckpt->free_segment_count = cpu_to_le32(free_segments(sbi)); 976 for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) { 977 ckpt->cur_node_segno[i] = 978 cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE)); 979 ckpt->cur_node_blkoff[i] = 980 cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE)); 981 ckpt->alloc_type[i + CURSEG_HOT_NODE] = 982 curseg_alloc_type(sbi, i + CURSEG_HOT_NODE); 983 } 984 for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) { 985 ckpt->cur_data_segno[i] = 986 cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA)); 987 ckpt->cur_data_blkoff[i] = 988 cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA)); 989 ckpt->alloc_type[i + CURSEG_HOT_DATA] = 990 curseg_alloc_type(sbi, i + CURSEG_HOT_DATA); 991 } 992 993 ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi)); 994 ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi)); 995 ckpt->next_free_nid = cpu_to_le32(last_nid); 996 997 /* 2 cp + n data seg summary + orphan inode blocks */ 998 data_sum_blocks = npages_for_summary_flush(sbi, false); 999 if (data_sum_blocks < NR_CURSEG_DATA_TYPE) 1000 set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); 1001 else 1002 clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); 1003 1004 orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num); 1005 ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks + 1006 orphan_blocks); 1007 1008 if (__remain_node_summaries(cpc->reason)) 1009 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS+ 1010 cp_payload_blks + data_sum_blocks + 1011 orphan_blocks + NR_CURSEG_NODE_TYPE); 1012 else 1013 ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS + 1014 cp_payload_blks + data_sum_blocks + 1015 orphan_blocks); 1016 1017 if (cpc->reason == CP_UMOUNT) 1018 set_ckpt_flags(ckpt, CP_UMOUNT_FLAG); 1019 else 1020 clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG); 1021 1022 if (cpc->reason == CP_FASTBOOT) 1023 set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG); 1024 else 1025 clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG); 1026 1027 if (orphan_num) 1028 set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); 1029 else 1030 clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); 1031 1032 if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) 1033 set_ckpt_flags(ckpt, CP_FSCK_FLAG); 1034 1035 /* update SIT/NAT bitmap */ 1036 get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP)); 1037 get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP)); 1038 1039 crc32 = f2fs_crc32(sbi, ckpt, le32_to_cpu(ckpt->checksum_offset)); 1040 *((__le32 *)((unsigned char *)ckpt + 1041 le32_to_cpu(ckpt->checksum_offset))) 1042 = cpu_to_le32(crc32); 1043 1044 start_blk = __start_cp_addr(sbi); 1045 1046 /* need to wait for end_io results */ 1047 wait_on_all_pages_writeback(sbi); 1048 if (unlikely(f2fs_cp_error(sbi))) 1049 return -EIO; 1050 1051 /* write out checkpoint buffer at block 0 */ 1052 update_meta_page(sbi, ckpt, start_blk++); 1053 1054 for (i = 1; i < 1 + cp_payload_blks; i++) 1055 update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE, 1056 start_blk++); 1057 1058 if (orphan_num) { 1059 write_orphan_inodes(sbi, start_blk); 1060 start_blk += orphan_blocks; 1061 } 1062 1063 write_data_summaries(sbi, start_blk); 1064 start_blk += data_sum_blocks; 1065 1066 /* Record write statistics in the hot node summary */ 1067 kbytes_written = sbi->kbytes_written; 1068 if (sb->s_bdev->bd_part) 1069 kbytes_written += BD_PART_WRITTEN(sbi); 1070 1071 seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written); 1072 1073 if (__remain_node_summaries(cpc->reason)) { 1074 write_node_summaries(sbi, start_blk); 1075 start_blk += NR_CURSEG_NODE_TYPE; 1076 } 1077 1078 /* writeout checkpoint block */ 1079 update_meta_page(sbi, ckpt, start_blk); 1080 1081 /* wait for previous submitted node/meta pages writeback */ 1082 wait_on_all_pages_writeback(sbi); 1083 1084 if (unlikely(f2fs_cp_error(sbi))) 1085 return -EIO; 1086 1087 filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LLONG_MAX); 1088 filemap_fdatawait_range(META_MAPPING(sbi), 0, LLONG_MAX); 1089 1090 /* update user_block_counts */ 1091 sbi->last_valid_block_count = sbi->total_valid_block_count; 1092 percpu_counter_set(&sbi->alloc_valid_block_count, 0); 1093 1094 /* Here, we only have one bio having CP pack */ 1095 sync_meta_pages(sbi, META_FLUSH, LONG_MAX); 1096 1097 /* wait for previous submitted meta pages writeback */ 1098 wait_on_all_pages_writeback(sbi); 1099 1100 /* 1101 * invalidate meta page which is used temporarily for zeroing out 1102 * block at the end of warm node chain. 1103 */ 1104 if (invalidate) 1105 invalidate_mapping_pages(META_MAPPING(sbi), discard_blk, 1106 discard_blk); 1107 1108 release_ino_entry(sbi, false); 1109 1110 if (unlikely(f2fs_cp_error(sbi))) 1111 return -EIO; 1112 1113 clear_prefree_segments(sbi, cpc); 1114 clear_sbi_flag(sbi, SBI_IS_DIRTY); 1115 1116 return 0; 1117 } 1118 1119 /* 1120 * We guarantee that this checkpoint procedure will not fail. 1121 */ 1122 int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) 1123 { 1124 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); 1125 unsigned long long ckpt_ver; 1126 int err = 0; 1127 1128 mutex_lock(&sbi->cp_mutex); 1129 1130 if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) && 1131 (cpc->reason == CP_FASTBOOT || cpc->reason == CP_SYNC || 1132 (cpc->reason == CP_DISCARD && !sbi->discard_blks))) 1133 goto out; 1134 if (unlikely(f2fs_cp_error(sbi))) { 1135 err = -EIO; 1136 goto out; 1137 } 1138 if (f2fs_readonly(sbi->sb)) { 1139 err = -EROFS; 1140 goto out; 1141 } 1142 1143 trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops"); 1144 1145 err = block_operations(sbi); 1146 if (err) 1147 goto out; 1148 1149 trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops"); 1150 1151 f2fs_flush_merged_bios(sbi); 1152 1153 /* 1154 * update checkpoint pack index 1155 * Increase the version number so that 1156 * SIT entries and seg summaries are written at correct place 1157 */ 1158 ckpt_ver = cur_cp_version(ckpt); 1159 ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver); 1160 1161 /* write cached NAT/SIT entries to NAT/SIT area */ 1162 flush_nat_entries(sbi); 1163 flush_sit_entries(sbi, cpc); 1164 1165 /* unlock all the fs_lock[] in do_checkpoint() */ 1166 err = do_checkpoint(sbi, cpc); 1167 1168 unblock_operations(sbi); 1169 stat_inc_cp_count(sbi->stat_info); 1170 1171 if (cpc->reason == CP_RECOVERY) 1172 f2fs_msg(sbi->sb, KERN_NOTICE, 1173 "checkpoint: version = %llx", ckpt_ver); 1174 1175 /* do checkpoint periodically */ 1176 f2fs_update_time(sbi, CP_TIME); 1177 trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint"); 1178 out: 1179 mutex_unlock(&sbi->cp_mutex); 1180 return err; 1181 } 1182 1183 void init_ino_entry_info(struct f2fs_sb_info *sbi) 1184 { 1185 int i; 1186 1187 for (i = 0; i < MAX_INO_ENTRY; i++) { 1188 struct inode_management *im = &sbi->im[i]; 1189 1190 INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC); 1191 spin_lock_init(&im->ino_lock); 1192 INIT_LIST_HEAD(&im->ino_list); 1193 im->ino_num = 0; 1194 } 1195 1196 sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS - 1197 NR_CURSEG_TYPE - __cp_payload(sbi)) * 1198 F2FS_ORPHANS_PER_BLOCK; 1199 } 1200 1201 int __init create_checkpoint_caches(void) 1202 { 1203 ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry", 1204 sizeof(struct ino_entry)); 1205 if (!ino_entry_slab) 1206 return -ENOMEM; 1207 inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry", 1208 sizeof(struct inode_entry)); 1209 if (!inode_entry_slab) { 1210 kmem_cache_destroy(ino_entry_slab); 1211 return -ENOMEM; 1212 } 1213 return 0; 1214 } 1215 1216 void destroy_checkpoint_caches(void) 1217 { 1218 kmem_cache_destroy(ino_entry_slab); 1219 kmem_cache_destroy(inode_entry_slab); 1220 } 1221