16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 19e20d96d6SChris Mason #include <linux/fs.h> 20d98237b3SChris Mason #include <linux/blkdev.h> 2187cbda5cSChris Mason #include <linux/scatterlist.h> 2222b0ebdaSChris Mason #include <linux/swap.h> 230f7d52f4SChris Mason #include <linux/radix-tree.h> 2435b7e476SChris Mason #include <linux/writeback.h> 25d397712bSChris Mason #include <linux/buffer_head.h> 26ce9adaa5SChris Mason #include <linux/workqueue.h> 27a74a4b97SChris Mason #include <linux/kthread.h> 28a74a4b97SChris Mason #include <linux/freezer.h> 29163e783eSDavid Woodhouse #include <linux/crc32c.h> 305a0e3ad6STejun Heo #include <linux/slab.h> 31784b4e29SChris Mason #include <linux/migrate.h> 327a36ddecSDavid Sterba #include <linux/ratelimit.h> 337e75bf3fSDavid Sterba #include <asm/unaligned.h> 344b4e25f2SChris Mason #include "compat.h" 35eb60ceacSChris Mason #include "ctree.h" 36eb60ceacSChris Mason #include "disk-io.h" 37e089f05cSChris Mason #include "transaction.h" 380f7d52f4SChris Mason #include "btrfs_inode.h" 390b86a832SChris Mason #include "volumes.h" 40db94535dSChris Mason #include "print-tree.h" 418b712842SChris Mason #include "async-thread.h" 42925baeddSChris Mason #include "locking.h" 43e02119d5SChris Mason #include "tree-log.h" 44fa9c0d79SChris Mason #include "free-space-cache.h" 45581bb050SLi Zefan #include "inode-map.h" 4621adbd5cSStefan Behrens #include "check-integrity.h" 47eb60ceacSChris Mason 48d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops; 498b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work); 504df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root); 51acce952bSliubo static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info, 52acce952bSliubo int read_only); 53143bede5SJeff Mahoney static void btrfs_destroy_ordered_operations(struct btrfs_root *root); 54143bede5SJeff Mahoney static void btrfs_destroy_ordered_extents(struct btrfs_root *root); 55acce952bSliubo static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, 56acce952bSliubo struct btrfs_root *root); 57143bede5SJeff Mahoney static void btrfs_destroy_pending_snapshots(struct btrfs_transaction *t); 58143bede5SJeff Mahoney static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root); 59acce952bSliubo static int btrfs_destroy_marked_extents(struct btrfs_root *root, 60acce952bSliubo struct extent_io_tree *dirty_pages, 61acce952bSliubo int mark); 62acce952bSliubo static int btrfs_destroy_pinned_extent(struct btrfs_root *root, 63acce952bSliubo struct extent_io_tree *pinned_extents); 64ce9adaa5SChris Mason 65d352ac68SChris Mason /* 66d352ac68SChris Mason * end_io_wq structs are used to do processing in task context when an IO is 67d352ac68SChris Mason * complete. This is used during reads to verify checksums, and it is used 68d352ac68SChris Mason * by writes to insert metadata for new file extents after IO is complete. 69d352ac68SChris Mason */ 70ce9adaa5SChris Mason struct end_io_wq { 71ce9adaa5SChris Mason struct bio *bio; 72ce9adaa5SChris Mason bio_end_io_t *end_io; 73ce9adaa5SChris Mason void *private; 74ce9adaa5SChris Mason struct btrfs_fs_info *info; 75ce9adaa5SChris Mason int error; 7622c59948SChris Mason int metadata; 77ce9adaa5SChris Mason struct list_head list; 788b712842SChris Mason struct btrfs_work work; 79ce9adaa5SChris Mason }; 800da5468fSChris Mason 81d352ac68SChris Mason /* 82d352ac68SChris Mason * async submit bios are used to offload expensive checksumming 83d352ac68SChris Mason * onto the worker threads. They checksum file and metadata bios 84d352ac68SChris Mason * just before they are sent down the IO stack. 85d352ac68SChris Mason */ 8644b8bd7eSChris Mason struct async_submit_bio { 8744b8bd7eSChris Mason struct inode *inode; 8844b8bd7eSChris Mason struct bio *bio; 8944b8bd7eSChris Mason struct list_head list; 904a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start; 914a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done; 9244b8bd7eSChris Mason int rw; 9344b8bd7eSChris Mason int mirror_num; 94c8b97818SChris Mason unsigned long bio_flags; 95eaf25d93SChris Mason /* 96eaf25d93SChris Mason * bio_offset is optional, can be used if the pages in the bio 97eaf25d93SChris Mason * can't tell us where in the file the bio should go 98eaf25d93SChris Mason */ 99eaf25d93SChris Mason u64 bio_offset; 1008b712842SChris Mason struct btrfs_work work; 10179787eaaSJeff Mahoney int error; 10244b8bd7eSChris Mason }; 10344b8bd7eSChris Mason 10485d4e461SChris Mason /* 10585d4e461SChris Mason * Lockdep class keys for extent_buffer->lock's in this root. For a given 10685d4e461SChris Mason * eb, the lockdep key is determined by the btrfs_root it belongs to and 10785d4e461SChris Mason * the level the eb occupies in the tree. 1084008c04aSChris Mason * 10985d4e461SChris Mason * Different roots are used for different purposes and may nest inside each 11085d4e461SChris Mason * other and they require separate keysets. As lockdep keys should be 11185d4e461SChris Mason * static, assign keysets according to the purpose of the root as indicated 11285d4e461SChris Mason * by btrfs_root->objectid. This ensures that all special purpose roots 11385d4e461SChris Mason * have separate keysets. 1144008c04aSChris Mason * 11585d4e461SChris Mason * Lock-nesting across peer nodes is always done with the immediate parent 11685d4e461SChris Mason * node locked thus preventing deadlock. As lockdep doesn't know this, use 11785d4e461SChris Mason * subclass to avoid triggering lockdep warning in such cases. 1184008c04aSChris Mason * 11985d4e461SChris Mason * The key is set by the readpage_end_io_hook after the buffer has passed 12085d4e461SChris Mason * csum validation but before the pages are unlocked. It is also set by 12185d4e461SChris Mason * btrfs_init_new_buffer on freshly allocated blocks. 12285d4e461SChris Mason * 12385d4e461SChris Mason * We also add a check to make sure the highest level of the tree is the 12485d4e461SChris Mason * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code 12585d4e461SChris Mason * needs update as well. 1264008c04aSChris Mason */ 1274008c04aSChris Mason #ifdef CONFIG_DEBUG_LOCK_ALLOC 1284008c04aSChris Mason # if BTRFS_MAX_LEVEL != 8 1294008c04aSChris Mason # error 1304008c04aSChris Mason # endif 13185d4e461SChris Mason 13285d4e461SChris Mason static struct btrfs_lockdep_keyset { 13385d4e461SChris Mason u64 id; /* root objectid */ 13485d4e461SChris Mason const char *name_stem; /* lock name stem */ 13585d4e461SChris Mason char names[BTRFS_MAX_LEVEL + 1][20]; 13685d4e461SChris Mason struct lock_class_key keys[BTRFS_MAX_LEVEL + 1]; 13785d4e461SChris Mason } btrfs_lockdep_keysets[] = { 13885d4e461SChris Mason { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" }, 13985d4e461SChris Mason { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" }, 14085d4e461SChris Mason { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" }, 14185d4e461SChris Mason { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" }, 14285d4e461SChris Mason { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" }, 14385d4e461SChris Mason { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" }, 14485d4e461SChris Mason { .id = BTRFS_ORPHAN_OBJECTID, .name_stem = "orphan" }, 14585d4e461SChris Mason { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" }, 14685d4e461SChris Mason { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" }, 14785d4e461SChris Mason { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" }, 14885d4e461SChris Mason { .id = 0, .name_stem = "tree" }, 1494008c04aSChris Mason }; 15085d4e461SChris Mason 15185d4e461SChris Mason void __init btrfs_init_lockdep(void) 15285d4e461SChris Mason { 15385d4e461SChris Mason int i, j; 15485d4e461SChris Mason 15585d4e461SChris Mason /* initialize lockdep class names */ 15685d4e461SChris Mason for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) { 15785d4e461SChris Mason struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i]; 15885d4e461SChris Mason 15985d4e461SChris Mason for (j = 0; j < ARRAY_SIZE(ks->names); j++) 16085d4e461SChris Mason snprintf(ks->names[j], sizeof(ks->names[j]), 16185d4e461SChris Mason "btrfs-%s-%02d", ks->name_stem, j); 16285d4e461SChris Mason } 16385d4e461SChris Mason } 16485d4e461SChris Mason 16585d4e461SChris Mason void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, 16685d4e461SChris Mason int level) 16785d4e461SChris Mason { 16885d4e461SChris Mason struct btrfs_lockdep_keyset *ks; 16985d4e461SChris Mason 17085d4e461SChris Mason BUG_ON(level >= ARRAY_SIZE(ks->keys)); 17185d4e461SChris Mason 17285d4e461SChris Mason /* find the matching keyset, id 0 is the default entry */ 17385d4e461SChris Mason for (ks = btrfs_lockdep_keysets; ks->id; ks++) 17485d4e461SChris Mason if (ks->id == objectid) 17585d4e461SChris Mason break; 17685d4e461SChris Mason 17785d4e461SChris Mason lockdep_set_class_and_name(&eb->lock, 17885d4e461SChris Mason &ks->keys[level], ks->names[level]); 17985d4e461SChris Mason } 18085d4e461SChris Mason 1814008c04aSChris Mason #endif 1824008c04aSChris Mason 183d352ac68SChris Mason /* 184d352ac68SChris Mason * extents on the btree inode are pretty simple, there's one extent 185d352ac68SChris Mason * that covers the entire device 186d352ac68SChris Mason */ 187b2950863SChristoph Hellwig static struct extent_map *btree_get_extent(struct inode *inode, 188306e16ceSDavid Sterba struct page *page, size_t pg_offset, u64 start, u64 len, 1895f39d397SChris Mason int create) 1905f39d397SChris Mason { 1915f39d397SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1925f39d397SChris Mason struct extent_map *em; 1935f39d397SChris Mason int ret; 1945f39d397SChris Mason 195890871beSChris Mason read_lock(&em_tree->lock); 196d1310b2eSChris Mason em = lookup_extent_mapping(em_tree, start, len); 197a061fc8dSChris Mason if (em) { 198a061fc8dSChris Mason em->bdev = 199a061fc8dSChris Mason BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 200890871beSChris Mason read_unlock(&em_tree->lock); 2015f39d397SChris Mason goto out; 202a061fc8dSChris Mason } 203890871beSChris Mason read_unlock(&em_tree->lock); 2047b13b7b1SChris Mason 205172ddd60SDavid Sterba em = alloc_extent_map(); 2065f39d397SChris Mason if (!em) { 2075f39d397SChris Mason em = ERR_PTR(-ENOMEM); 2085f39d397SChris Mason goto out; 2095f39d397SChris Mason } 2105f39d397SChris Mason em->start = 0; 2110afbaf8cSChris Mason em->len = (u64)-1; 212c8b97818SChris Mason em->block_len = (u64)-1; 2135f39d397SChris Mason em->block_start = 0; 214a061fc8dSChris Mason em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 215d1310b2eSChris Mason 216890871beSChris Mason write_lock(&em_tree->lock); 2175f39d397SChris Mason ret = add_extent_mapping(em_tree, em); 2185f39d397SChris Mason if (ret == -EEXIST) { 2190afbaf8cSChris Mason u64 failed_start = em->start; 2200afbaf8cSChris Mason u64 failed_len = em->len; 2210afbaf8cSChris Mason 2225f39d397SChris Mason free_extent_map(em); 2237b13b7b1SChris Mason em = lookup_extent_mapping(em_tree, start, len); 2240afbaf8cSChris Mason if (em) { 2257b13b7b1SChris Mason ret = 0; 2260afbaf8cSChris Mason } else { 2270afbaf8cSChris Mason em = lookup_extent_mapping(em_tree, failed_start, 2280afbaf8cSChris Mason failed_len); 2297b13b7b1SChris Mason ret = -EIO; 2300afbaf8cSChris Mason } 2315f39d397SChris Mason } else if (ret) { 2327b13b7b1SChris Mason free_extent_map(em); 2337b13b7b1SChris Mason em = NULL; 2345f39d397SChris Mason } 235890871beSChris Mason write_unlock(&em_tree->lock); 2367b13b7b1SChris Mason 2377b13b7b1SChris Mason if (ret) 2387b13b7b1SChris Mason em = ERR_PTR(ret); 2395f39d397SChris Mason out: 2405f39d397SChris Mason return em; 2415f39d397SChris Mason } 2425f39d397SChris Mason 24319c00ddcSChris Mason u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) 24419c00ddcSChris Mason { 245163e783eSDavid Woodhouse return crc32c(seed, data, len); 24619c00ddcSChris Mason } 24719c00ddcSChris Mason 24819c00ddcSChris Mason void btrfs_csum_final(u32 crc, char *result) 24919c00ddcSChris Mason { 2507e75bf3fSDavid Sterba put_unaligned_le32(~crc, result); 25119c00ddcSChris Mason } 25219c00ddcSChris Mason 253d352ac68SChris Mason /* 254d352ac68SChris Mason * compute the csum for a btree block, and either verify it or write it 255d352ac68SChris Mason * into the csum field of the block. 256d352ac68SChris Mason */ 25719c00ddcSChris Mason static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, 25819c00ddcSChris Mason int verify) 25919c00ddcSChris Mason { 2606c41761fSDavid Sterba u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); 261607d432dSJosef Bacik char *result = NULL; 26219c00ddcSChris Mason unsigned long len; 26319c00ddcSChris Mason unsigned long cur_len; 26419c00ddcSChris Mason unsigned long offset = BTRFS_CSUM_SIZE; 26519c00ddcSChris Mason char *kaddr; 26619c00ddcSChris Mason unsigned long map_start; 26719c00ddcSChris Mason unsigned long map_len; 26819c00ddcSChris Mason int err; 26919c00ddcSChris Mason u32 crc = ~(u32)0; 270607d432dSJosef Bacik unsigned long inline_result; 27119c00ddcSChris Mason 27219c00ddcSChris Mason len = buf->len - offset; 27319c00ddcSChris Mason while (len > 0) { 27419c00ddcSChris Mason err = map_private_extent_buffer(buf, offset, 32, 275a6591715SChris Mason &kaddr, &map_start, &map_len); 276d397712bSChris Mason if (err) 27719c00ddcSChris Mason return 1; 27819c00ddcSChris Mason cur_len = min(len, map_len - (offset - map_start)); 27919c00ddcSChris Mason crc = btrfs_csum_data(root, kaddr + offset - map_start, 28019c00ddcSChris Mason crc, cur_len); 28119c00ddcSChris Mason len -= cur_len; 28219c00ddcSChris Mason offset += cur_len; 28319c00ddcSChris Mason } 284607d432dSJosef Bacik if (csum_size > sizeof(inline_result)) { 285607d432dSJosef Bacik result = kzalloc(csum_size * sizeof(char), GFP_NOFS); 286607d432dSJosef Bacik if (!result) 287607d432dSJosef Bacik return 1; 288607d432dSJosef Bacik } else { 289607d432dSJosef Bacik result = (char *)&inline_result; 290607d432dSJosef Bacik } 291607d432dSJosef Bacik 29219c00ddcSChris Mason btrfs_csum_final(crc, result); 29319c00ddcSChris Mason 29419c00ddcSChris Mason if (verify) { 295607d432dSJosef Bacik if (memcmp_extent_buffer(buf, result, 0, csum_size)) { 296e4204dedSChris Mason u32 val; 297e4204dedSChris Mason u32 found = 0; 298607d432dSJosef Bacik memcpy(&found, result, csum_size); 299e4204dedSChris Mason 300607d432dSJosef Bacik read_extent_buffer(buf, &val, 0, csum_size); 3017a36ddecSDavid Sterba printk_ratelimited(KERN_INFO "btrfs: %s checksum verify " 302193f284dSChris Mason "failed on %llu wanted %X found %X " 303193f284dSChris Mason "level %d\n", 30419c00ddcSChris Mason root->fs_info->sb->s_id, 305193f284dSChris Mason (unsigned long long)buf->start, val, found, 306193f284dSChris Mason btrfs_header_level(buf)); 307607d432dSJosef Bacik if (result != (char *)&inline_result) 308607d432dSJosef Bacik kfree(result); 30919c00ddcSChris Mason return 1; 31019c00ddcSChris Mason } 31119c00ddcSChris Mason } else { 312607d432dSJosef Bacik write_extent_buffer(buf, result, 0, csum_size); 31319c00ddcSChris Mason } 314607d432dSJosef Bacik if (result != (char *)&inline_result) 315607d432dSJosef Bacik kfree(result); 31619c00ddcSChris Mason return 0; 31719c00ddcSChris Mason } 31819c00ddcSChris Mason 319d352ac68SChris Mason /* 320d352ac68SChris Mason * we can't consider a given block up to date unless the transid of the 321d352ac68SChris Mason * block matches the transid in the parent node's pointer. This is how we 322d352ac68SChris Mason * detect blocks that either didn't get written at all or got written 323d352ac68SChris Mason * in the wrong place. 324d352ac68SChris Mason */ 3251259ab75SChris Mason static int verify_parent_transid(struct extent_io_tree *io_tree, 3261259ab75SChris Mason struct extent_buffer *eb, u64 parent_transid) 3271259ab75SChris Mason { 3282ac55d41SJosef Bacik struct extent_state *cached_state = NULL; 3291259ab75SChris Mason int ret; 3301259ab75SChris Mason 3311259ab75SChris Mason if (!parent_transid || btrfs_header_generation(eb) == parent_transid) 3321259ab75SChris Mason return 0; 3331259ab75SChris Mason 3342ac55d41SJosef Bacik lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, 335d0082371SJeff Mahoney 0, &cached_state); 3362ac55d41SJosef Bacik if (extent_buffer_uptodate(io_tree, eb, cached_state) && 3371259ab75SChris Mason btrfs_header_generation(eb) == parent_transid) { 3381259ab75SChris Mason ret = 0; 3391259ab75SChris Mason goto out; 3401259ab75SChris Mason } 3417a36ddecSDavid Sterba printk_ratelimited("parent transid verify failed on %llu wanted %llu " 342193f284dSChris Mason "found %llu\n", 3431259ab75SChris Mason (unsigned long long)eb->start, 3441259ab75SChris Mason (unsigned long long)parent_transid, 3451259ab75SChris Mason (unsigned long long)btrfs_header_generation(eb)); 3461259ab75SChris Mason ret = 1; 3472ac55d41SJosef Bacik clear_extent_buffer_uptodate(io_tree, eb, &cached_state); 34833958dc6SChris Mason out: 3492ac55d41SJosef Bacik unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, 3502ac55d41SJosef Bacik &cached_state, GFP_NOFS); 3511259ab75SChris Mason return ret; 3521259ab75SChris Mason } 3531259ab75SChris Mason 354d352ac68SChris Mason /* 355d352ac68SChris Mason * helper to read a given tree block, doing retries as required when 356d352ac68SChris Mason * the checksums don't match and we have alternate mirrors to try. 357d352ac68SChris Mason */ 358f188591eSChris Mason static int btree_read_extent_buffer_pages(struct btrfs_root *root, 359f188591eSChris Mason struct extent_buffer *eb, 360ca7a79adSChris Mason u64 start, u64 parent_transid) 361f188591eSChris Mason { 362f188591eSChris Mason struct extent_io_tree *io_tree; 363f188591eSChris Mason int ret; 364f188591eSChris Mason int num_copies = 0; 365f188591eSChris Mason int mirror_num = 0; 366f188591eSChris Mason 367a826d6dcSJosef Bacik clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); 368f188591eSChris Mason io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 369f188591eSChris Mason while (1) { 370bb82ab88SArne Jansen ret = read_extent_buffer_pages(io_tree, eb, start, 371bb82ab88SArne Jansen WAIT_COMPLETE, 372f188591eSChris Mason btree_get_extent, mirror_num); 3731259ab75SChris Mason if (!ret && 3741259ab75SChris Mason !verify_parent_transid(io_tree, eb, parent_transid)) 375f188591eSChris Mason return ret; 376d397712bSChris Mason 377a826d6dcSJosef Bacik /* 378a826d6dcSJosef Bacik * This buffer's crc is fine, but its contents are corrupted, so 379a826d6dcSJosef Bacik * there is no reason to read the other copies, they won't be 380a826d6dcSJosef Bacik * any less wrong. 381a826d6dcSJosef Bacik */ 382a826d6dcSJosef Bacik if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags)) 383a826d6dcSJosef Bacik return ret; 384a826d6dcSJosef Bacik 385f188591eSChris Mason num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, 386f188591eSChris Mason eb->start, eb->len); 3874235298eSChris Mason if (num_copies == 1) 388f188591eSChris Mason return ret; 3894235298eSChris Mason 390f188591eSChris Mason mirror_num++; 3914235298eSChris Mason if (mirror_num > num_copies) 392f188591eSChris Mason return ret; 393f188591eSChris Mason } 394f188591eSChris Mason return -EIO; 395f188591eSChris Mason } 39619c00ddcSChris Mason 397d352ac68SChris Mason /* 398d397712bSChris Mason * checksum a dirty tree block before IO. This has extra checks to make sure 399d397712bSChris Mason * we only fill in the checksum field in the first page of a multi-page block 400d352ac68SChris Mason */ 401d397712bSChris Mason 402b2950863SChristoph Hellwig static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) 40319c00ddcSChris Mason { 404d1310b2eSChris Mason struct extent_io_tree *tree; 40535ebb934SChris Mason u64 start = (u64)page->index << PAGE_CACHE_SHIFT; 40619c00ddcSChris Mason u64 found_start; 40719c00ddcSChris Mason unsigned long len; 40819c00ddcSChris Mason struct extent_buffer *eb; 40979787eaaSJeff Mahoney int ret = -EIO; 410f188591eSChris Mason 411d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 41219c00ddcSChris Mason 413eb14ab8eSChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 414eb14ab8eSChris Mason WARN_ON(1); 41519c00ddcSChris Mason goto out; 416eb14ab8eSChris Mason } 417eb14ab8eSChris Mason if (!page->private) { 418eb14ab8eSChris Mason WARN_ON(1); 41919c00ddcSChris Mason goto out; 420eb14ab8eSChris Mason } 42119c00ddcSChris Mason len = page->private >> 2; 422d397712bSChris Mason WARN_ON(len == 0); 423d397712bSChris Mason 424ba144192SDavid Sterba eb = alloc_extent_buffer(tree, start, len, page); 42591ca338dSTsutomu Itoh if (eb == NULL) { 42691ca338dSTsutomu Itoh WARN_ON(1); 42779787eaaSJeff Mahoney ret = -ENOMEM; 42891ca338dSTsutomu Itoh goto out; 42991ca338dSTsutomu Itoh } 430ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, 431ca7a79adSChris Mason btrfs_header_generation(eb)); 43279787eaaSJeff Mahoney if (ret) { 43379787eaaSJeff Mahoney btrfs_printk(root->fs_info, KERN_WARNING 43479787eaaSJeff Mahoney "Failed to checksum dirty buffer @ %llu[%lu]\n", 43579787eaaSJeff Mahoney start, len); 43679787eaaSJeff Mahoney goto err; 43779787eaaSJeff Mahoney } 438784b4e29SChris Mason WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN)); 439784b4e29SChris Mason 44079787eaaSJeff Mahoney ret = -EIO; 44119c00ddcSChris Mason found_start = btrfs_header_bytenr(eb); 44219c00ddcSChris Mason if (found_start != start) { 44355c69072SChris Mason WARN_ON(1); 44455c69072SChris Mason goto err; 44555c69072SChris Mason } 44655c69072SChris Mason if (eb->first_page != page) { 44755c69072SChris Mason WARN_ON(1); 44855c69072SChris Mason goto err; 44955c69072SChris Mason } 45055c69072SChris Mason if (!PageUptodate(page)) { 45155c69072SChris Mason WARN_ON(1); 45255c69072SChris Mason goto err; 45319c00ddcSChris Mason } 45419c00ddcSChris Mason csum_tree_block(root, eb, 0); 45579787eaaSJeff Mahoney ret = 0; 45655c69072SChris Mason err: 45719c00ddcSChris Mason free_extent_buffer(eb); 45819c00ddcSChris Mason out: 45979787eaaSJeff Mahoney return ret; 46019c00ddcSChris Mason } 46119c00ddcSChris Mason 4622b82032cSYan Zheng static int check_tree_block_fsid(struct btrfs_root *root, 4632b82032cSYan Zheng struct extent_buffer *eb) 4642b82032cSYan Zheng { 4652b82032cSYan Zheng struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 4662b82032cSYan Zheng u8 fsid[BTRFS_UUID_SIZE]; 4672b82032cSYan Zheng int ret = 1; 4682b82032cSYan Zheng 4692b82032cSYan Zheng read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), 4702b82032cSYan Zheng BTRFS_FSID_SIZE); 4712b82032cSYan Zheng while (fs_devices) { 4722b82032cSYan Zheng if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { 4732b82032cSYan Zheng ret = 0; 4742b82032cSYan Zheng break; 4752b82032cSYan Zheng } 4762b82032cSYan Zheng fs_devices = fs_devices->seed; 4772b82032cSYan Zheng } 4782b82032cSYan Zheng return ret; 4792b82032cSYan Zheng } 4802b82032cSYan Zheng 481a826d6dcSJosef Bacik #define CORRUPT(reason, eb, root, slot) \ 482a826d6dcSJosef Bacik printk(KERN_CRIT "btrfs: corrupt leaf, %s: block=%llu," \ 483a826d6dcSJosef Bacik "root=%llu, slot=%d\n", reason, \ 484a826d6dcSJosef Bacik (unsigned long long)btrfs_header_bytenr(eb), \ 485a826d6dcSJosef Bacik (unsigned long long)root->objectid, slot) 486a826d6dcSJosef Bacik 487a826d6dcSJosef Bacik static noinline int check_leaf(struct btrfs_root *root, 488a826d6dcSJosef Bacik struct extent_buffer *leaf) 489a826d6dcSJosef Bacik { 490a826d6dcSJosef Bacik struct btrfs_key key; 491a826d6dcSJosef Bacik struct btrfs_key leaf_key; 492a826d6dcSJosef Bacik u32 nritems = btrfs_header_nritems(leaf); 493a826d6dcSJosef Bacik int slot; 494a826d6dcSJosef Bacik 495a826d6dcSJosef Bacik if (nritems == 0) 496a826d6dcSJosef Bacik return 0; 497a826d6dcSJosef Bacik 498a826d6dcSJosef Bacik /* Check the 0 item */ 499a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) != 500a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 501a826d6dcSJosef Bacik CORRUPT("invalid item offset size pair", leaf, root, 0); 502a826d6dcSJosef Bacik return -EIO; 503a826d6dcSJosef Bacik } 504a826d6dcSJosef Bacik 505a826d6dcSJosef Bacik /* 506a826d6dcSJosef Bacik * Check to make sure each items keys are in the correct order and their 507a826d6dcSJosef Bacik * offsets make sense. We only have to loop through nritems-1 because 508a826d6dcSJosef Bacik * we check the current slot against the next slot, which verifies the 509a826d6dcSJosef Bacik * next slot's offset+size makes sense and that the current's slot 510a826d6dcSJosef Bacik * offset is correct. 511a826d6dcSJosef Bacik */ 512a826d6dcSJosef Bacik for (slot = 0; slot < nritems - 1; slot++) { 513a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &leaf_key, slot); 514a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &key, slot + 1); 515a826d6dcSJosef Bacik 516a826d6dcSJosef Bacik /* Make sure the keys are in the right order */ 517a826d6dcSJosef Bacik if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) { 518a826d6dcSJosef Bacik CORRUPT("bad key order", leaf, root, slot); 519a826d6dcSJosef Bacik return -EIO; 520a826d6dcSJosef Bacik } 521a826d6dcSJosef Bacik 522a826d6dcSJosef Bacik /* 523a826d6dcSJosef Bacik * Make sure the offset and ends are right, remember that the 524a826d6dcSJosef Bacik * item data starts at the end of the leaf and grows towards the 525a826d6dcSJosef Bacik * front. 526a826d6dcSJosef Bacik */ 527a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, slot) != 528a826d6dcSJosef Bacik btrfs_item_end_nr(leaf, slot + 1)) { 529a826d6dcSJosef Bacik CORRUPT("slot offset bad", leaf, root, slot); 530a826d6dcSJosef Bacik return -EIO; 531a826d6dcSJosef Bacik } 532a826d6dcSJosef Bacik 533a826d6dcSJosef Bacik /* 534a826d6dcSJosef Bacik * Check to make sure that we don't point outside of the leaf, 535a826d6dcSJosef Bacik * just incase all the items are consistent to eachother, but 536a826d6dcSJosef Bacik * all point outside of the leaf. 537a826d6dcSJosef Bacik */ 538a826d6dcSJosef Bacik if (btrfs_item_end_nr(leaf, slot) > 539a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 540a826d6dcSJosef Bacik CORRUPT("slot end outside of leaf", leaf, root, slot); 541a826d6dcSJosef Bacik return -EIO; 542a826d6dcSJosef Bacik } 543a826d6dcSJosef Bacik } 544a826d6dcSJosef Bacik 545a826d6dcSJosef Bacik return 0; 546a826d6dcSJosef Bacik } 547a826d6dcSJosef Bacik 548b2950863SChristoph Hellwig static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, 549ce9adaa5SChris Mason struct extent_state *state) 550ce9adaa5SChris Mason { 551ce9adaa5SChris Mason struct extent_io_tree *tree; 552ce9adaa5SChris Mason u64 found_start; 553ce9adaa5SChris Mason int found_level; 554ce9adaa5SChris Mason unsigned long len; 555ce9adaa5SChris Mason struct extent_buffer *eb; 556ce9adaa5SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 557f188591eSChris Mason int ret = 0; 558ce9adaa5SChris Mason 559ce9adaa5SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 560ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 561ce9adaa5SChris Mason goto out; 562ce9adaa5SChris Mason if (!page->private) 563ce9adaa5SChris Mason goto out; 564d397712bSChris Mason 565ce9adaa5SChris Mason len = page->private >> 2; 566d397712bSChris Mason WARN_ON(len == 0); 567d397712bSChris Mason 568ba144192SDavid Sterba eb = alloc_extent_buffer(tree, start, len, page); 56991ca338dSTsutomu Itoh if (eb == NULL) { 57091ca338dSTsutomu Itoh ret = -EIO; 57191ca338dSTsutomu Itoh goto out; 57291ca338dSTsutomu Itoh } 573f188591eSChris Mason 574ce9adaa5SChris Mason found_start = btrfs_header_bytenr(eb); 57523a07867SChris Mason if (found_start != start) { 5767a36ddecSDavid Sterba printk_ratelimited(KERN_INFO "btrfs bad tree block start " 577193f284dSChris Mason "%llu %llu\n", 578a1b32a59SChris Mason (unsigned long long)found_start, 579a1b32a59SChris Mason (unsigned long long)eb->start); 580f188591eSChris Mason ret = -EIO; 581ce9adaa5SChris Mason goto err; 582ce9adaa5SChris Mason } 583ce9adaa5SChris Mason if (eb->first_page != page) { 584d397712bSChris Mason printk(KERN_INFO "btrfs bad first page %lu %lu\n", 585d397712bSChris Mason eb->first_page->index, page->index); 586ce9adaa5SChris Mason WARN_ON(1); 587f188591eSChris Mason ret = -EIO; 588ce9adaa5SChris Mason goto err; 589ce9adaa5SChris Mason } 5902b82032cSYan Zheng if (check_tree_block_fsid(root, eb)) { 5917a36ddecSDavid Sterba printk_ratelimited(KERN_INFO "btrfs bad fsid on block %llu\n", 592d397712bSChris Mason (unsigned long long)eb->start); 5931259ab75SChris Mason ret = -EIO; 5941259ab75SChris Mason goto err; 5951259ab75SChris Mason } 596ce9adaa5SChris Mason found_level = btrfs_header_level(eb); 597ce9adaa5SChris Mason 59885d4e461SChris Mason btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), 59985d4e461SChris Mason eb, found_level); 6004008c04aSChris Mason 601ce9adaa5SChris Mason ret = csum_tree_block(root, eb, 1); 602a826d6dcSJosef Bacik if (ret) { 603f188591eSChris Mason ret = -EIO; 604a826d6dcSJosef Bacik goto err; 605a826d6dcSJosef Bacik } 606a826d6dcSJosef Bacik 607a826d6dcSJosef Bacik /* 608a826d6dcSJosef Bacik * If this is a leaf block and it is corrupt, set the corrupt bit so 609a826d6dcSJosef Bacik * that we don't try and read the other copies of this block, just 610a826d6dcSJosef Bacik * return -EIO. 611a826d6dcSJosef Bacik */ 612a826d6dcSJosef Bacik if (found_level == 0 && check_leaf(root, eb)) { 613a826d6dcSJosef Bacik set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); 614a826d6dcSJosef Bacik ret = -EIO; 615a826d6dcSJosef Bacik } 616ce9adaa5SChris Mason 617ce9adaa5SChris Mason end = min_t(u64, eb->len, PAGE_CACHE_SIZE); 618ce9adaa5SChris Mason end = eb->start + end - 1; 619ce9adaa5SChris Mason err: 6204bb31e92SArne Jansen if (test_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) { 6214bb31e92SArne Jansen clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags); 6224bb31e92SArne Jansen btree_readahead_hook(root, eb, eb->start, ret); 6234bb31e92SArne Jansen } 6244bb31e92SArne Jansen 625ce9adaa5SChris Mason free_extent_buffer(eb); 626ce9adaa5SChris Mason out: 627f188591eSChris Mason return ret; 628ce9adaa5SChris Mason } 629ce9adaa5SChris Mason 6304bb31e92SArne Jansen static int btree_io_failed_hook(struct bio *failed_bio, 6314bb31e92SArne Jansen struct page *page, u64 start, u64 end, 63232240a91SJan Schmidt int mirror_num, struct extent_state *state) 6334bb31e92SArne Jansen { 6344bb31e92SArne Jansen struct extent_io_tree *tree; 6354bb31e92SArne Jansen unsigned long len; 6364bb31e92SArne Jansen struct extent_buffer *eb; 6374bb31e92SArne Jansen struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 6384bb31e92SArne Jansen 6394bb31e92SArne Jansen tree = &BTRFS_I(page->mapping->host)->io_tree; 6404bb31e92SArne Jansen if (page->private == EXTENT_PAGE_PRIVATE) 6414bb31e92SArne Jansen goto out; 6424bb31e92SArne Jansen if (!page->private) 6434bb31e92SArne Jansen goto out; 6444bb31e92SArne Jansen 6454bb31e92SArne Jansen len = page->private >> 2; 6464bb31e92SArne Jansen WARN_ON(len == 0); 6474bb31e92SArne Jansen 6484bb31e92SArne Jansen eb = alloc_extent_buffer(tree, start, len, page); 6494bb31e92SArne Jansen if (eb == NULL) 6504bb31e92SArne Jansen goto out; 6514bb31e92SArne Jansen 6524bb31e92SArne Jansen if (test_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) { 6534bb31e92SArne Jansen clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags); 6544bb31e92SArne Jansen btree_readahead_hook(root, eb, eb->start, -EIO); 6554bb31e92SArne Jansen } 656c674e04eSChris Mason free_extent_buffer(eb); 6574bb31e92SArne Jansen 6584bb31e92SArne Jansen out: 6594bb31e92SArne Jansen return -EIO; /* we fixed nothing */ 6604bb31e92SArne Jansen } 6614bb31e92SArne Jansen 662ce9adaa5SChris Mason static void end_workqueue_bio(struct bio *bio, int err) 663ce9adaa5SChris Mason { 664ce9adaa5SChris Mason struct end_io_wq *end_io_wq = bio->bi_private; 665ce9adaa5SChris Mason struct btrfs_fs_info *fs_info; 666ce9adaa5SChris Mason 667ce9adaa5SChris Mason fs_info = end_io_wq->info; 668ce9adaa5SChris Mason end_io_wq->error = err; 6698b712842SChris Mason end_io_wq->work.func = end_workqueue_fn; 6708b712842SChris Mason end_io_wq->work.flags = 0; 671d20f7043SChris Mason 6727b6d91daSChristoph Hellwig if (bio->bi_rw & REQ_WRITE) { 6730cb59c99SJosef Bacik if (end_io_wq->metadata == 1) 674cad321adSChris Mason btrfs_queue_worker(&fs_info->endio_meta_write_workers, 675cad321adSChris Mason &end_io_wq->work); 6760cb59c99SJosef Bacik else if (end_io_wq->metadata == 2) 6770cb59c99SJosef Bacik btrfs_queue_worker(&fs_info->endio_freespace_worker, 6780cb59c99SJosef Bacik &end_io_wq->work); 679cad321adSChris Mason else 680e6dcd2dcSChris Mason btrfs_queue_worker(&fs_info->endio_write_workers, 681e6dcd2dcSChris Mason &end_io_wq->work); 682d20f7043SChris Mason } else { 683d20f7043SChris Mason if (end_io_wq->metadata) 684d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_meta_workers, 685d20f7043SChris Mason &end_io_wq->work); 686e6dcd2dcSChris Mason else 687d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_workers, 688d20f7043SChris Mason &end_io_wq->work); 689d20f7043SChris Mason } 690ce9adaa5SChris Mason } 691ce9adaa5SChris Mason 6920cb59c99SJosef Bacik /* 6930cb59c99SJosef Bacik * For the metadata arg you want 6940cb59c99SJosef Bacik * 6950cb59c99SJosef Bacik * 0 - if data 6960cb59c99SJosef Bacik * 1 - if normal metadta 6970cb59c99SJosef Bacik * 2 - if writing to the free space cache area 6980cb59c99SJosef Bacik */ 69922c59948SChris Mason int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 70022c59948SChris Mason int metadata) 7010b86a832SChris Mason { 702ce9adaa5SChris Mason struct end_io_wq *end_io_wq; 703ce9adaa5SChris Mason end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); 704ce9adaa5SChris Mason if (!end_io_wq) 705ce9adaa5SChris Mason return -ENOMEM; 706ce9adaa5SChris Mason 707ce9adaa5SChris Mason end_io_wq->private = bio->bi_private; 708ce9adaa5SChris Mason end_io_wq->end_io = bio->bi_end_io; 70922c59948SChris Mason end_io_wq->info = info; 710ce9adaa5SChris Mason end_io_wq->error = 0; 711ce9adaa5SChris Mason end_io_wq->bio = bio; 71222c59948SChris Mason end_io_wq->metadata = metadata; 713ce9adaa5SChris Mason 714ce9adaa5SChris Mason bio->bi_private = end_io_wq; 715ce9adaa5SChris Mason bio->bi_end_io = end_workqueue_bio; 71622c59948SChris Mason return 0; 71722c59948SChris Mason } 71822c59948SChris Mason 719b64a2851SChris Mason unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) 7204854ddd0SChris Mason { 7214854ddd0SChris Mason unsigned long limit = min_t(unsigned long, 7224854ddd0SChris Mason info->workers.max_workers, 7234854ddd0SChris Mason info->fs_devices->open_devices); 7244854ddd0SChris Mason return 256 * limit; 7254854ddd0SChris Mason } 7264854ddd0SChris Mason 7274a69a410SChris Mason static void run_one_async_start(struct btrfs_work *work) 7284a69a410SChris Mason { 7294a69a410SChris Mason struct async_submit_bio *async; 73079787eaaSJeff Mahoney int ret; 7314a69a410SChris Mason 7324a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 73379787eaaSJeff Mahoney ret = async->submit_bio_start(async->inode, async->rw, async->bio, 734eaf25d93SChris Mason async->mirror_num, async->bio_flags, 735eaf25d93SChris Mason async->bio_offset); 73679787eaaSJeff Mahoney if (ret) 73779787eaaSJeff Mahoney async->error = ret; 7384a69a410SChris Mason } 7394a69a410SChris Mason 7404a69a410SChris Mason static void run_one_async_done(struct btrfs_work *work) 7418b712842SChris Mason { 7428b712842SChris Mason struct btrfs_fs_info *fs_info; 7438b712842SChris Mason struct async_submit_bio *async; 7444854ddd0SChris Mason int limit; 7458b712842SChris Mason 7468b712842SChris Mason async = container_of(work, struct async_submit_bio, work); 7478b712842SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 7484854ddd0SChris Mason 749b64a2851SChris Mason limit = btrfs_async_submit_limit(fs_info); 7504854ddd0SChris Mason limit = limit * 2 / 3; 7514854ddd0SChris Mason 7528b712842SChris Mason atomic_dec(&fs_info->nr_async_submits); 7530986fe9eSChris Mason 754b64a2851SChris Mason if (atomic_read(&fs_info->nr_async_submits) < limit && 755b64a2851SChris Mason waitqueue_active(&fs_info->async_submit_wait)) 7564854ddd0SChris Mason wake_up(&fs_info->async_submit_wait); 7574854ddd0SChris Mason 75879787eaaSJeff Mahoney /* If an error occured we just want to clean up the bio and move on */ 75979787eaaSJeff Mahoney if (async->error) { 76079787eaaSJeff Mahoney bio_endio(async->bio, async->error); 76179787eaaSJeff Mahoney return; 76279787eaaSJeff Mahoney } 76379787eaaSJeff Mahoney 7644a69a410SChris Mason async->submit_bio_done(async->inode, async->rw, async->bio, 765eaf25d93SChris Mason async->mirror_num, async->bio_flags, 766eaf25d93SChris Mason async->bio_offset); 7674a69a410SChris Mason } 7684a69a410SChris Mason 7694a69a410SChris Mason static void run_one_async_free(struct btrfs_work *work) 7704a69a410SChris Mason { 7714a69a410SChris Mason struct async_submit_bio *async; 7724a69a410SChris Mason 7734a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 7748b712842SChris Mason kfree(async); 7758b712842SChris Mason } 7768b712842SChris Mason 77744b8bd7eSChris Mason int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 77844b8bd7eSChris Mason int rw, struct bio *bio, int mirror_num, 779c8b97818SChris Mason unsigned long bio_flags, 780eaf25d93SChris Mason u64 bio_offset, 7814a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start, 7824a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done) 78344b8bd7eSChris Mason { 78444b8bd7eSChris Mason struct async_submit_bio *async; 78544b8bd7eSChris Mason 78644b8bd7eSChris Mason async = kmalloc(sizeof(*async), GFP_NOFS); 78744b8bd7eSChris Mason if (!async) 78844b8bd7eSChris Mason return -ENOMEM; 78944b8bd7eSChris Mason 79044b8bd7eSChris Mason async->inode = inode; 79144b8bd7eSChris Mason async->rw = rw; 79244b8bd7eSChris Mason async->bio = bio; 79344b8bd7eSChris Mason async->mirror_num = mirror_num; 7944a69a410SChris Mason async->submit_bio_start = submit_bio_start; 7954a69a410SChris Mason async->submit_bio_done = submit_bio_done; 7964a69a410SChris Mason 7974a69a410SChris Mason async->work.func = run_one_async_start; 7984a69a410SChris Mason async->work.ordered_func = run_one_async_done; 7994a69a410SChris Mason async->work.ordered_free = run_one_async_free; 8004a69a410SChris Mason 8018b712842SChris Mason async->work.flags = 0; 802c8b97818SChris Mason async->bio_flags = bio_flags; 803eaf25d93SChris Mason async->bio_offset = bio_offset; 8048c8bee1dSChris Mason 80579787eaaSJeff Mahoney async->error = 0; 80679787eaaSJeff Mahoney 807cb03c743SChris Mason atomic_inc(&fs_info->nr_async_submits); 808d313d7a3SChris Mason 8097b6d91daSChristoph Hellwig if (rw & REQ_SYNC) 810d313d7a3SChris Mason btrfs_set_work_high_prio(&async->work); 811d313d7a3SChris Mason 8128b712842SChris Mason btrfs_queue_worker(&fs_info->workers, &async->work); 8139473f16cSChris Mason 814771ed689SChris Mason while (atomic_read(&fs_info->async_submit_draining) && 815771ed689SChris Mason atomic_read(&fs_info->nr_async_submits)) { 816771ed689SChris Mason wait_event(fs_info->async_submit_wait, 817771ed689SChris Mason (atomic_read(&fs_info->nr_async_submits) == 0)); 818771ed689SChris Mason } 819771ed689SChris Mason 82044b8bd7eSChris Mason return 0; 82144b8bd7eSChris Mason } 82244b8bd7eSChris Mason 823ce3ed71aSChris Mason static int btree_csum_one_bio(struct bio *bio) 824ce3ed71aSChris Mason { 825ce3ed71aSChris Mason struct bio_vec *bvec = bio->bi_io_vec; 826ce3ed71aSChris Mason int bio_index = 0; 827ce3ed71aSChris Mason struct btrfs_root *root; 82879787eaaSJeff Mahoney int ret = 0; 829ce3ed71aSChris Mason 830ce3ed71aSChris Mason WARN_ON(bio->bi_vcnt <= 0); 831ce3ed71aSChris Mason while (bio_index < bio->bi_vcnt) { 832ce3ed71aSChris Mason root = BTRFS_I(bvec->bv_page->mapping->host)->root; 83379787eaaSJeff Mahoney ret = csum_dirty_buffer(root, bvec->bv_page); 83479787eaaSJeff Mahoney if (ret) 83579787eaaSJeff Mahoney break; 836ce3ed71aSChris Mason bio_index++; 837ce3ed71aSChris Mason bvec++; 838ce3ed71aSChris Mason } 83979787eaaSJeff Mahoney return ret; 840ce3ed71aSChris Mason } 841ce3ed71aSChris Mason 8424a69a410SChris Mason static int __btree_submit_bio_start(struct inode *inode, int rw, 8434a69a410SChris Mason struct bio *bio, int mirror_num, 844eaf25d93SChris Mason unsigned long bio_flags, 845eaf25d93SChris Mason u64 bio_offset) 84622c59948SChris Mason { 8478b712842SChris Mason /* 8488b712842SChris Mason * when we're called for a write, we're already in the async 8495443be45SChris Mason * submission context. Just jump into btrfs_map_bio 8508b712842SChris Mason */ 85179787eaaSJeff Mahoney return btree_csum_one_bio(bio); 85222c59948SChris Mason } 85322c59948SChris Mason 8544a69a410SChris Mason static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, 855eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 856eaf25d93SChris Mason u64 bio_offset) 8574a69a410SChris Mason { 8588b712842SChris Mason /* 8594a69a410SChris Mason * when we're called for a write, we're already in the async 8604a69a410SChris Mason * submission context. Just jump into btrfs_map_bio 8618b712842SChris Mason */ 8628b712842SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); 8630b86a832SChris Mason } 8640b86a832SChris Mason 86544b8bd7eSChris Mason static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 866eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 867eaf25d93SChris Mason u64 bio_offset) 86844b8bd7eSChris Mason { 8694a69a410SChris Mason int ret; 870cad321adSChris Mason 871355808c2SJeff Mahoney ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, bio, 1); 872355808c2SJeff Mahoney if (ret) 873355808c2SJeff Mahoney return ret; 8744a69a410SChris Mason 8757b6d91daSChristoph Hellwig if (!(rw & REQ_WRITE)) { 876cad321adSChris Mason /* 877cad321adSChris Mason * called for a read, do the setup so that checksum validation 878cad321adSChris Mason * can happen in the async kernel threads 879cad321adSChris Mason */ 8804a69a410SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 8816f3577bdSChris Mason mirror_num, 0); 88244b8bd7eSChris Mason } 883d313d7a3SChris Mason 884cad321adSChris Mason /* 885cad321adSChris Mason * kthread helpers are used to submit writes so that checksumming 886cad321adSChris Mason * can happen in parallel across all CPUs 887cad321adSChris Mason */ 88844b8bd7eSChris Mason return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, 889c8b97818SChris Mason inode, rw, bio, mirror_num, 0, 890eaf25d93SChris Mason bio_offset, 8914a69a410SChris Mason __btree_submit_bio_start, 8924a69a410SChris Mason __btree_submit_bio_done); 89344b8bd7eSChris Mason } 89444b8bd7eSChris Mason 8953dd1462eSJan Beulich #ifdef CONFIG_MIGRATION 896784b4e29SChris Mason static int btree_migratepage(struct address_space *mapping, 897a6bc32b8SMel Gorman struct page *newpage, struct page *page, 898a6bc32b8SMel Gorman enum migrate_mode mode) 899784b4e29SChris Mason { 900784b4e29SChris Mason /* 901784b4e29SChris Mason * we can't safely write a btree page from here, 902784b4e29SChris Mason * we haven't done the locking hook 903784b4e29SChris Mason */ 904784b4e29SChris Mason if (PageDirty(page)) 905784b4e29SChris Mason return -EAGAIN; 906784b4e29SChris Mason /* 907784b4e29SChris Mason * Buffers may be managed in a filesystem specific way. 908784b4e29SChris Mason * We must have no buffers or drop them. 909784b4e29SChris Mason */ 910784b4e29SChris Mason if (page_has_private(page) && 911784b4e29SChris Mason !try_to_release_page(page, GFP_KERNEL)) 912784b4e29SChris Mason return -EAGAIN; 913a6bc32b8SMel Gorman return migrate_page(mapping, newpage, page, mode); 914784b4e29SChris Mason } 9153dd1462eSJan Beulich #endif 916784b4e29SChris Mason 9175f39d397SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 9185f39d397SChris Mason { 919d1310b2eSChris Mason struct extent_io_tree *tree; 920b9473439SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 921b9473439SChris Mason struct extent_buffer *eb; 922b9473439SChris Mason int was_dirty; 9235443be45SChris Mason 924b9473439SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 925b9473439SChris Mason if (!(current->flags & PF_MEMALLOC)) { 926b9473439SChris Mason return extent_write_full_page(tree, page, 927b9473439SChris Mason btree_get_extent, wbc); 928b9473439SChris Mason } 929b9473439SChris Mason 9305443be45SChris Mason redirty_page_for_writepage(wbc, page); 931784b4e29SChris Mason eb = btrfs_find_tree_block(root, page_offset(page), PAGE_CACHE_SIZE); 932b9473439SChris Mason WARN_ON(!eb); 933b9473439SChris Mason 934b9473439SChris Mason was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); 935b9473439SChris Mason if (!was_dirty) { 936b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 937b9473439SChris Mason root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE; 938b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 939b9473439SChris Mason } 940b9473439SChris Mason free_extent_buffer(eb); 941b9473439SChris Mason 9425443be45SChris Mason unlock_page(page); 9435443be45SChris Mason return 0; 9445443be45SChris Mason } 9450da5468fSChris Mason 9460da5468fSChris Mason static int btree_writepages(struct address_space *mapping, 9470da5468fSChris Mason struct writeback_control *wbc) 9480da5468fSChris Mason { 949d1310b2eSChris Mason struct extent_io_tree *tree; 950d1310b2eSChris Mason tree = &BTRFS_I(mapping->host)->io_tree; 951d8d5f3e1SChris Mason if (wbc->sync_mode == WB_SYNC_NONE) { 952b9473439SChris Mason struct btrfs_root *root = BTRFS_I(mapping->host)->root; 953793955bcSChris Mason u64 num_dirty; 95424ab9cd8SChris Mason unsigned long thresh = 32 * 1024 * 1024; 955448d640bSChris Mason 956448d640bSChris Mason if (wbc->for_kupdate) 957448d640bSChris Mason return 0; 958448d640bSChris Mason 959b9473439SChris Mason /* this is a bit racy, but that's ok */ 960b9473439SChris Mason num_dirty = root->fs_info->dirty_metadata_bytes; 961d397712bSChris Mason if (num_dirty < thresh) 962793955bcSChris Mason return 0; 963793955bcSChris Mason } 9640da5468fSChris Mason return extent_writepages(tree, mapping, btree_get_extent, wbc); 9650da5468fSChris Mason } 9660da5468fSChris Mason 967b2950863SChristoph Hellwig static int btree_readpage(struct file *file, struct page *page) 9685f39d397SChris Mason { 969d1310b2eSChris Mason struct extent_io_tree *tree; 970d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 9718ddc7d9cSJan Schmidt return extent_read_full_page(tree, page, btree_get_extent, 0); 9725f39d397SChris Mason } 9735f39d397SChris Mason 97470dec807SChris Mason static int btree_releasepage(struct page *page, gfp_t gfp_flags) 9755f39d397SChris Mason { 976d1310b2eSChris Mason struct extent_io_tree *tree; 977d1310b2eSChris Mason struct extent_map_tree *map; 9785f39d397SChris Mason int ret; 9795f39d397SChris Mason 98098509cfcSChris Mason if (PageWriteback(page) || PageDirty(page)) 98198509cfcSChris Mason return 0; 98298509cfcSChris Mason 983d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 984d1310b2eSChris Mason map = &BTRFS_I(page->mapping->host)->extent_tree; 9856af118ceSChris Mason 9860c4e538bSDavid Sterba /* 9870c4e538bSDavid Sterba * We need to mask out eg. __GFP_HIGHMEM and __GFP_DMA32 as we're doing 9880c4e538bSDavid Sterba * slab allocation from alloc_extent_state down the callchain where 9890c4e538bSDavid Sterba * it'd hit a BUG_ON as those flags are not allowed. 9900c4e538bSDavid Sterba */ 9910c4e538bSDavid Sterba gfp_flags &= ~GFP_SLAB_BUG_MASK; 9920c4e538bSDavid Sterba 9937b13b7b1SChris Mason ret = try_release_extent_state(map, tree, page, gfp_flags); 994d397712bSChris Mason if (!ret) 9956af118ceSChris Mason return 0; 9966af118ceSChris Mason 9976af118ceSChris Mason ret = try_release_extent_buffer(tree, page); 9985f39d397SChris Mason if (ret == 1) { 9995f39d397SChris Mason ClearPagePrivate(page); 10005f39d397SChris Mason set_page_private(page, 0); 1001d98237b3SChris Mason page_cache_release(page); 10025f39d397SChris Mason } 10036af118ceSChris Mason 1004d98237b3SChris Mason return ret; 1005d98237b3SChris Mason } 1006d98237b3SChris Mason 10075f39d397SChris Mason static void btree_invalidatepage(struct page *page, unsigned long offset) 1008d98237b3SChris Mason { 1009d1310b2eSChris Mason struct extent_io_tree *tree; 1010d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 10115f39d397SChris Mason extent_invalidatepage(tree, page, offset); 10125f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 10139ad6b7bcSChris Mason if (PagePrivate(page)) { 1014d397712bSChris Mason printk(KERN_WARNING "btrfs warning page private not zero " 1015d397712bSChris Mason "on page %llu\n", (unsigned long long)page_offset(page)); 10169ad6b7bcSChris Mason ClearPagePrivate(page); 10179ad6b7bcSChris Mason set_page_private(page, 0); 10189ad6b7bcSChris Mason page_cache_release(page); 10199ad6b7bcSChris Mason } 1020d98237b3SChris Mason } 1021d98237b3SChris Mason 10227f09410bSAlexey Dobriyan static const struct address_space_operations btree_aops = { 1023d98237b3SChris Mason .readpage = btree_readpage, 1024d98237b3SChris Mason .writepage = btree_writepage, 10250da5468fSChris Mason .writepages = btree_writepages, 10265f39d397SChris Mason .releasepage = btree_releasepage, 10275f39d397SChris Mason .invalidatepage = btree_invalidatepage, 10285a92bc88SChris Mason #ifdef CONFIG_MIGRATION 1029784b4e29SChris Mason .migratepage = btree_migratepage, 10305a92bc88SChris Mason #endif 1031d98237b3SChris Mason }; 1032123abc88SChris Mason 1033ca7a79adSChris Mason int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, 1034ca7a79adSChris Mason u64 parent_transid) 1035090d1875SChris Mason { 10365f39d397SChris Mason struct extent_buffer *buf = NULL; 10375f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1038de428b63SChris Mason int ret = 0; 1039090d1875SChris Mason 1040db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 10415f39d397SChris Mason if (!buf) 1042090d1875SChris Mason return 0; 1043d1310b2eSChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, 1044bb82ab88SArne Jansen buf, 0, WAIT_NONE, btree_get_extent, 0); 10455f39d397SChris Mason free_extent_buffer(buf); 1046de428b63SChris Mason return ret; 1047090d1875SChris Mason } 1048090d1875SChris Mason 1049ab0fff03SArne Jansen int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize, 1050ab0fff03SArne Jansen int mirror_num, struct extent_buffer **eb) 1051ab0fff03SArne Jansen { 1052ab0fff03SArne Jansen struct extent_buffer *buf = NULL; 1053ab0fff03SArne Jansen struct inode *btree_inode = root->fs_info->btree_inode; 1054ab0fff03SArne Jansen struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree; 1055ab0fff03SArne Jansen int ret; 1056ab0fff03SArne Jansen 1057ab0fff03SArne Jansen buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 1058ab0fff03SArne Jansen if (!buf) 1059ab0fff03SArne Jansen return 0; 1060ab0fff03SArne Jansen 1061ab0fff03SArne Jansen set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags); 1062ab0fff03SArne Jansen 1063ab0fff03SArne Jansen ret = read_extent_buffer_pages(io_tree, buf, 0, WAIT_PAGE_LOCK, 1064ab0fff03SArne Jansen btree_get_extent, mirror_num); 1065ab0fff03SArne Jansen if (ret) { 1066ab0fff03SArne Jansen free_extent_buffer(buf); 1067ab0fff03SArne Jansen return ret; 1068ab0fff03SArne Jansen } 1069ab0fff03SArne Jansen 1070ab0fff03SArne Jansen if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) { 1071ab0fff03SArne Jansen free_extent_buffer(buf); 1072ab0fff03SArne Jansen return -EIO; 1073ab0fff03SArne Jansen } else if (extent_buffer_uptodate(io_tree, buf, NULL)) { 1074ab0fff03SArne Jansen *eb = buf; 1075ab0fff03SArne Jansen } else { 1076ab0fff03SArne Jansen free_extent_buffer(buf); 1077ab0fff03SArne Jansen } 1078ab0fff03SArne Jansen return 0; 1079ab0fff03SArne Jansen } 1080ab0fff03SArne Jansen 10810999df54SChris Mason struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, 10820999df54SChris Mason u64 bytenr, u32 blocksize) 10830999df54SChris Mason { 10840999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 10850999df54SChris Mason struct extent_buffer *eb; 10860999df54SChris Mason eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 1087f09d1f60SDavid Sterba bytenr, blocksize); 10880999df54SChris Mason return eb; 10890999df54SChris Mason } 10900999df54SChris Mason 10910999df54SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 10920999df54SChris Mason u64 bytenr, u32 blocksize) 10930999df54SChris Mason { 10940999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 10950999df54SChris Mason struct extent_buffer *eb; 10960999df54SChris Mason 10970999df54SChris Mason eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 1098ba144192SDavid Sterba bytenr, blocksize, NULL); 10990999df54SChris Mason return eb; 11000999df54SChris Mason } 11010999df54SChris Mason 11020999df54SChris Mason 1103e02119d5SChris Mason int btrfs_write_tree_block(struct extent_buffer *buf) 1104e02119d5SChris Mason { 11058aa38c31SChristoph Hellwig return filemap_fdatawrite_range(buf->first_page->mapping, buf->start, 11068aa38c31SChristoph Hellwig buf->start + buf->len - 1); 1107e02119d5SChris Mason } 1108e02119d5SChris Mason 1109e02119d5SChris Mason int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) 1110e02119d5SChris Mason { 11118aa38c31SChristoph Hellwig return filemap_fdatawait_range(buf->first_page->mapping, 11128aa38c31SChristoph Hellwig buf->start, buf->start + buf->len - 1); 1113e02119d5SChris Mason } 1114e02119d5SChris Mason 1115db94535dSChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, 1116ca7a79adSChris Mason u32 blocksize, u64 parent_transid) 1117e20d96d6SChris Mason { 11185f39d397SChris Mason struct extent_buffer *buf = NULL; 111919c00ddcSChris Mason int ret; 112019c00ddcSChris Mason 1121db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 11225f39d397SChris Mason if (!buf) 1123d98237b3SChris Mason return NULL; 1124e4204dedSChris Mason 1125ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 1126ce9adaa5SChris Mason 1127d397712bSChris Mason if (ret == 0) 1128b4ce94deSChris Mason set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); 11295f39d397SChris Mason return buf; 1130ce9adaa5SChris Mason 1131eb60ceacSChris Mason } 1132eb60ceacSChris Mason 1133d5c13f92SJeff Mahoney void clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, 11345f39d397SChris Mason struct extent_buffer *buf) 1135ed2ff2cbSChris Mason { 11365f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 113755c69072SChris Mason if (btrfs_header_generation(buf) == 1138925baeddSChris Mason root->fs_info->running_transaction->transid) { 1139b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 1140b4ce94deSChris Mason 1141b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { 1142b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 1143b9473439SChris Mason if (root->fs_info->dirty_metadata_bytes >= buf->len) 1144b9473439SChris Mason root->fs_info->dirty_metadata_bytes -= buf->len; 1145d5c13f92SJeff Mahoney else { 1146d5c13f92SJeff Mahoney spin_unlock(&root->fs_info->delalloc_lock); 1147d5c13f92SJeff Mahoney btrfs_panic(root->fs_info, -EOVERFLOW, 1148d5c13f92SJeff Mahoney "Can't clear %lu bytes from " 1149d5c13f92SJeff Mahoney " dirty_mdatadata_bytes (%lu)", 1150d5c13f92SJeff Mahoney buf->len, 1151d5c13f92SJeff Mahoney root->fs_info->dirty_metadata_bytes); 1152d5c13f92SJeff Mahoney } 1153b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 1154b9473439SChris Mason } 1155b4ce94deSChris Mason 1156b9473439SChris Mason /* ugh, clear_extent_buffer_dirty needs to lock the page */ 1157b9473439SChris Mason btrfs_set_lock_blocking(buf); 1158d1310b2eSChris Mason clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 115955c69072SChris Mason buf); 1160925baeddSChris Mason } 11615f39d397SChris Mason } 11625f39d397SChris Mason 1163143bede5SJeff Mahoney static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 116487ee04ebSChris Mason u32 stripesize, struct btrfs_root *root, 11659f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 1166e20d96d6SChris Mason u64 objectid) 1167d97e63b6SChris Mason { 1168cfaa7295SChris Mason root->node = NULL; 1169a28ec197SChris Mason root->commit_root = NULL; 1170db94535dSChris Mason root->sectorsize = sectorsize; 1171db94535dSChris Mason root->nodesize = nodesize; 1172db94535dSChris Mason root->leafsize = leafsize; 117387ee04ebSChris Mason root->stripesize = stripesize; 1174123abc88SChris Mason root->ref_cows = 0; 11750b86a832SChris Mason root->track_dirty = 0; 1176c71bf099SYan, Zheng root->in_radix = 0; 1177d68fc57bSYan, Zheng root->orphan_item_inserted = 0; 1178d68fc57bSYan, Zheng root->orphan_cleanup_state = 0; 11790b86a832SChris Mason 11800f7d52f4SChris Mason root->objectid = objectid; 11810f7d52f4SChris Mason root->last_trans = 0; 118213a8a7c8SYan, Zheng root->highest_objectid = 0; 118358176a96SJosef Bacik root->name = NULL; 11846bef4d31SEric Paris root->inode_tree = RB_ROOT; 118516cdcec7SMiao Xie INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC); 1186f0486c68SYan, Zheng root->block_rsv = NULL; 1187d68fc57bSYan, Zheng root->orphan_block_rsv = NULL; 11880b86a832SChris Mason 11890b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 11907b128766SJosef Bacik INIT_LIST_HEAD(&root->orphan_list); 11915d4f98a2SYan Zheng INIT_LIST_HEAD(&root->root_list); 1192d68fc57bSYan, Zheng spin_lock_init(&root->orphan_lock); 11935d4f98a2SYan Zheng spin_lock_init(&root->inode_lock); 1194f0486c68SYan, Zheng spin_lock_init(&root->accounting_lock); 1195a2135011SChris Mason mutex_init(&root->objectid_mutex); 1196e02119d5SChris Mason mutex_init(&root->log_mutex); 11977237f183SYan Zheng init_waitqueue_head(&root->log_writer_wait); 11987237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[0]); 11997237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[1]); 12007237f183SYan Zheng atomic_set(&root->log_commit[0], 0); 12017237f183SYan Zheng atomic_set(&root->log_commit[1], 0); 12027237f183SYan Zheng atomic_set(&root->log_writers, 0); 12037237f183SYan Zheng root->log_batch = 0; 12047237f183SYan Zheng root->log_transid = 0; 1205257c62e1SChris Mason root->last_log_commit = 0; 1206d0c803c4SChris Mason extent_io_tree_init(&root->dirty_log_pages, 1207f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 1208017e5369SChris Mason 12093768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 12103768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 12116702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 121258176a96SJosef Bacik memset(&root->root_kobj, 0, sizeof(root->root_kobj)); 12133f157a2fSChris Mason root->defrag_trans_start = fs_info->generation; 121458176a96SJosef Bacik init_completion(&root->kobj_unregister); 12156702ed49SChris Mason root->defrag_running = 0; 12164d775673SChris Mason root->root_key.objectid = objectid; 12170ee5dc67SAl Viro root->anon_dev = 0; 12183768f368SChris Mason } 12193768f368SChris Mason 1220200a5c17SJeff Mahoney static int __must_check find_and_setup_root(struct btrfs_root *tree_root, 12219f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 12229f5fae2fSChris Mason u64 objectid, 1223e20d96d6SChris Mason struct btrfs_root *root) 12243768f368SChris Mason { 12253768f368SChris Mason int ret; 1226db94535dSChris Mason u32 blocksize; 122784234f3aSYan Zheng u64 generation; 12283768f368SChris Mason 1229db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 123087ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 123187ee04ebSChris Mason root, fs_info, objectid); 12323768f368SChris Mason ret = btrfs_find_last_root(tree_root, objectid, 12333768f368SChris Mason &root->root_item, &root->root_key); 12344df27c4dSYan, Zheng if (ret > 0) 12354df27c4dSYan, Zheng return -ENOENT; 1236200a5c17SJeff Mahoney else if (ret < 0) 1237200a5c17SJeff Mahoney return ret; 12383768f368SChris Mason 123984234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1240db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 1241af31f5e5SChris Mason root->commit_root = NULL; 1242db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 124384234f3aSYan Zheng blocksize, generation); 124468433b73SChris Mason if (!root->node || !btrfs_buffer_uptodate(root->node, generation)) { 124568433b73SChris Mason free_extent_buffer(root->node); 1246af31f5e5SChris Mason root->node = NULL; 124768433b73SChris Mason return -EIO; 124868433b73SChris Mason } 12494df27c4dSYan, Zheng root->commit_root = btrfs_root_node(root); 1250d97e63b6SChris Mason return 0; 1251d97e63b6SChris Mason } 1252d97e63b6SChris Mason 1253f84a8bd6SAl Viro static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info) 12546f07e42eSAl Viro { 12556f07e42eSAl Viro struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS); 12566f07e42eSAl Viro if (root) 12576f07e42eSAl Viro root->fs_info = fs_info; 12586f07e42eSAl Viro return root; 12596f07e42eSAl Viro } 12606f07e42eSAl Viro 12617237f183SYan Zheng static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, 1262e02119d5SChris Mason struct btrfs_fs_info *fs_info) 12630f7d52f4SChris Mason { 12640f7d52f4SChris Mason struct btrfs_root *root; 12650f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 12667237f183SYan Zheng struct extent_buffer *leaf; 1267e02119d5SChris Mason 12686f07e42eSAl Viro root = btrfs_alloc_root(fs_info); 1269e02119d5SChris Mason if (!root) 12707237f183SYan Zheng return ERR_PTR(-ENOMEM); 1271e02119d5SChris Mason 1272e02119d5SChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 1273e02119d5SChris Mason tree_root->sectorsize, tree_root->stripesize, 1274e02119d5SChris Mason root, fs_info, BTRFS_TREE_LOG_OBJECTID); 1275e02119d5SChris Mason 1276e02119d5SChris Mason root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; 1277e02119d5SChris Mason root->root_key.type = BTRFS_ROOT_ITEM_KEY; 1278e02119d5SChris Mason root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; 12797237f183SYan Zheng /* 12807237f183SYan Zheng * log trees do not get reference counted because they go away 12817237f183SYan Zheng * before a real commit is actually done. They do store pointers 12827237f183SYan Zheng * to file data extents, and those reference counts still get 12837237f183SYan Zheng * updated (along with back refs to the log tree). 12847237f183SYan Zheng */ 1285e02119d5SChris Mason root->ref_cows = 0; 1286e02119d5SChris Mason 12875d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 128866d7e7f0SArne Jansen BTRFS_TREE_LOG_OBJECTID, NULL, 128966d7e7f0SArne Jansen 0, 0, 0, 0); 12907237f183SYan Zheng if (IS_ERR(leaf)) { 12917237f183SYan Zheng kfree(root); 12927237f183SYan Zheng return ERR_CAST(leaf); 12937237f183SYan Zheng } 1294e02119d5SChris Mason 12955d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 12965d4f98a2SYan Zheng btrfs_set_header_bytenr(leaf, leaf->start); 12975d4f98a2SYan Zheng btrfs_set_header_generation(leaf, trans->transid); 12985d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 12995d4f98a2SYan Zheng btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); 13007237f183SYan Zheng root->node = leaf; 1301e02119d5SChris Mason 1302e02119d5SChris Mason write_extent_buffer(root->node, root->fs_info->fsid, 1303e02119d5SChris Mason (unsigned long)btrfs_header_fsid(root->node), 1304e02119d5SChris Mason BTRFS_FSID_SIZE); 1305e02119d5SChris Mason btrfs_mark_buffer_dirty(root->node); 1306e02119d5SChris Mason btrfs_tree_unlock(root->node); 13077237f183SYan Zheng return root; 13087237f183SYan Zheng } 13097237f183SYan Zheng 13107237f183SYan Zheng int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 13117237f183SYan Zheng struct btrfs_fs_info *fs_info) 13127237f183SYan Zheng { 13137237f183SYan Zheng struct btrfs_root *log_root; 13147237f183SYan Zheng 13157237f183SYan Zheng log_root = alloc_log_tree(trans, fs_info); 13167237f183SYan Zheng if (IS_ERR(log_root)) 13177237f183SYan Zheng return PTR_ERR(log_root); 13187237f183SYan Zheng WARN_ON(fs_info->log_root_tree); 13197237f183SYan Zheng fs_info->log_root_tree = log_root; 13207237f183SYan Zheng return 0; 13217237f183SYan Zheng } 13227237f183SYan Zheng 13237237f183SYan Zheng int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 13247237f183SYan Zheng struct btrfs_root *root) 13257237f183SYan Zheng { 13267237f183SYan Zheng struct btrfs_root *log_root; 13277237f183SYan Zheng struct btrfs_inode_item *inode_item; 13287237f183SYan Zheng 13297237f183SYan Zheng log_root = alloc_log_tree(trans, root->fs_info); 13307237f183SYan Zheng if (IS_ERR(log_root)) 13317237f183SYan Zheng return PTR_ERR(log_root); 13327237f183SYan Zheng 13337237f183SYan Zheng log_root->last_trans = trans->transid; 13347237f183SYan Zheng log_root->root_key.offset = root->root_key.objectid; 13357237f183SYan Zheng 13367237f183SYan Zheng inode_item = &log_root->root_item.inode; 13377237f183SYan Zheng inode_item->generation = cpu_to_le64(1); 13387237f183SYan Zheng inode_item->size = cpu_to_le64(3); 13397237f183SYan Zheng inode_item->nlink = cpu_to_le32(1); 13407237f183SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 13417237f183SYan Zheng inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 13427237f183SYan Zheng 13435d4f98a2SYan Zheng btrfs_set_root_node(&log_root->root_item, log_root->node); 13447237f183SYan Zheng 13457237f183SYan Zheng WARN_ON(root->log_root); 13467237f183SYan Zheng root->log_root = log_root; 13477237f183SYan Zheng root->log_transid = 0; 1348257c62e1SChris Mason root->last_log_commit = 0; 1349e02119d5SChris Mason return 0; 1350e02119d5SChris Mason } 1351e02119d5SChris Mason 1352e02119d5SChris Mason struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, 1353e02119d5SChris Mason struct btrfs_key *location) 1354e02119d5SChris Mason { 1355e02119d5SChris Mason struct btrfs_root *root; 1356e02119d5SChris Mason struct btrfs_fs_info *fs_info = tree_root->fs_info; 13570f7d52f4SChris Mason struct btrfs_path *path; 13585f39d397SChris Mason struct extent_buffer *l; 135984234f3aSYan Zheng u64 generation; 1360db94535dSChris Mason u32 blocksize; 13610f7d52f4SChris Mason int ret = 0; 13620f7d52f4SChris Mason 13636f07e42eSAl Viro root = btrfs_alloc_root(fs_info); 13640cf6c620SChris Mason if (!root) 13650f7d52f4SChris Mason return ERR_PTR(-ENOMEM); 13660f7d52f4SChris Mason if (location->offset == (u64)-1) { 1367db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 13680f7d52f4SChris Mason location->objectid, root); 13690f7d52f4SChris Mason if (ret) { 13700f7d52f4SChris Mason kfree(root); 13710f7d52f4SChris Mason return ERR_PTR(ret); 13720f7d52f4SChris Mason } 137313a8a7c8SYan, Zheng goto out; 13740f7d52f4SChris Mason } 13750f7d52f4SChris Mason 1376db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 137787ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 137887ee04ebSChris Mason root, fs_info, location->objectid); 13790f7d52f4SChris Mason 13800f7d52f4SChris Mason path = btrfs_alloc_path(); 1381db5b493aSTsutomu Itoh if (!path) { 1382db5b493aSTsutomu Itoh kfree(root); 1383db5b493aSTsutomu Itoh return ERR_PTR(-ENOMEM); 1384db5b493aSTsutomu Itoh } 13850f7d52f4SChris Mason ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); 138613a8a7c8SYan, Zheng if (ret == 0) { 13875f39d397SChris Mason l = path->nodes[0]; 13885f39d397SChris Mason read_extent_buffer(l, &root->root_item, 13895f39d397SChris Mason btrfs_item_ptr_offset(l, path->slots[0]), 13900f7d52f4SChris Mason sizeof(root->root_item)); 139144b36eb2SYan Zheng memcpy(&root->root_key, location, sizeof(*location)); 139213a8a7c8SYan, Zheng } 13930f7d52f4SChris Mason btrfs_free_path(path); 13940f7d52f4SChris Mason if (ret) { 13955e540f77STsutomu Itoh kfree(root); 139613a8a7c8SYan, Zheng if (ret > 0) 139713a8a7c8SYan, Zheng ret = -ENOENT; 13980f7d52f4SChris Mason return ERR_PTR(ret); 13990f7d52f4SChris Mason } 140013a8a7c8SYan, Zheng 140184234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1402db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 1403db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 140484234f3aSYan Zheng blocksize, generation); 14055d4f98a2SYan Zheng root->commit_root = btrfs_root_node(root); 140679787eaaSJeff Mahoney BUG_ON(!root->node); /* -ENOMEM */ 140713a8a7c8SYan, Zheng out: 140808fe4db1SLi Zefan if (location->objectid != BTRFS_TREE_LOG_OBJECTID) { 14090f7d52f4SChris Mason root->ref_cows = 1; 141008fe4db1SLi Zefan btrfs_check_and_init_root_item(&root->root_item); 141108fe4db1SLi Zefan } 141213a8a7c8SYan, Zheng 14135eda7b5eSChris Mason return root; 14145eda7b5eSChris Mason } 14155eda7b5eSChris Mason 1416edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 1417edbd8d4eSChris Mason struct btrfs_key *location) 14185eda7b5eSChris Mason { 14195eda7b5eSChris Mason struct btrfs_root *root; 14205eda7b5eSChris Mason int ret; 14215eda7b5eSChris Mason 1422edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 1423edbd8d4eSChris Mason return fs_info->tree_root; 1424edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 1425edbd8d4eSChris Mason return fs_info->extent_root; 14268f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 14278f18cf13SChris Mason return fs_info->chunk_root; 14288f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 14298f18cf13SChris Mason return fs_info->dev_root; 14300403e47eSYan Zheng if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) 14310403e47eSYan Zheng return fs_info->csum_root; 14324df27c4dSYan, Zheng again: 14334df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 14345eda7b5eSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 14355eda7b5eSChris Mason (unsigned long)location->objectid); 14364df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 14375eda7b5eSChris Mason if (root) 14385eda7b5eSChris Mason return root; 14395eda7b5eSChris Mason 1440e02119d5SChris Mason root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); 14415eda7b5eSChris Mason if (IS_ERR(root)) 14425eda7b5eSChris Mason return root; 14433394e160SChris Mason 1444581bb050SLi Zefan root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS); 1445581bb050SLi Zefan root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned), 1446581bb050SLi Zefan GFP_NOFS); 144735a30d7cSDavid Sterba if (!root->free_ino_pinned || !root->free_ino_ctl) { 144835a30d7cSDavid Sterba ret = -ENOMEM; 1449581bb050SLi Zefan goto fail; 145035a30d7cSDavid Sterba } 1451581bb050SLi Zefan 1452581bb050SLi Zefan btrfs_init_free_ino_ctl(root); 1453581bb050SLi Zefan mutex_init(&root->fs_commit_mutex); 1454581bb050SLi Zefan spin_lock_init(&root->cache_lock); 1455581bb050SLi Zefan init_waitqueue_head(&root->cache_wait); 1456581bb050SLi Zefan 14570ee5dc67SAl Viro ret = get_anon_bdev(&root->anon_dev); 1458ac08aedfSChris Mason if (ret) 1459ac08aedfSChris Mason goto fail; 14603394e160SChris Mason 1461d68fc57bSYan, Zheng if (btrfs_root_refs(&root->root_item) == 0) { 1462d68fc57bSYan, Zheng ret = -ENOENT; 1463d68fc57bSYan, Zheng goto fail; 1464d68fc57bSYan, Zheng } 1465d68fc57bSYan, Zheng 1466d68fc57bSYan, Zheng ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid); 1467d68fc57bSYan, Zheng if (ret < 0) 1468d68fc57bSYan, Zheng goto fail; 1469d68fc57bSYan, Zheng if (ret == 0) 1470d68fc57bSYan, Zheng root->orphan_item_inserted = 1; 1471d68fc57bSYan, Zheng 14724df27c4dSYan, Zheng ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); 14734df27c4dSYan, Zheng if (ret) 14744df27c4dSYan, Zheng goto fail; 14754df27c4dSYan, Zheng 14764df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 14772619ba1fSChris Mason ret = radix_tree_insert(&fs_info->fs_roots_radix, 14782619ba1fSChris Mason (unsigned long)root->root_key.objectid, 14790f7d52f4SChris Mason root); 1480d68fc57bSYan, Zheng if (ret == 0) 14814df27c4dSYan, Zheng root->in_radix = 1; 1482d68fc57bSYan, Zheng 14834df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 14844df27c4dSYan, Zheng radix_tree_preload_end(); 14850f7d52f4SChris Mason if (ret) { 14864df27c4dSYan, Zheng if (ret == -EEXIST) { 14874df27c4dSYan, Zheng free_fs_root(root); 14884df27c4dSYan, Zheng goto again; 14890f7d52f4SChris Mason } 14904df27c4dSYan, Zheng goto fail; 14914df27c4dSYan, Zheng } 14924df27c4dSYan, Zheng 1493edbd8d4eSChris Mason ret = btrfs_find_dead_roots(fs_info->tree_root, 14945d4f98a2SYan Zheng root->root_key.objectid); 14954df27c4dSYan, Zheng WARN_ON(ret); 1496edbd8d4eSChris Mason return root; 14974df27c4dSYan, Zheng fail: 14984df27c4dSYan, Zheng free_fs_root(root); 14994df27c4dSYan, Zheng return ERR_PTR(ret); 1500edbd8d4eSChris Mason } 1501edbd8d4eSChris Mason 150204160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 150304160088SChris Mason { 150404160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 150504160088SChris Mason int ret = 0; 150604160088SChris Mason struct btrfs_device *device; 150704160088SChris Mason struct backing_dev_info *bdi; 1508b7967db7SChris Mason 15091f78160cSXiao Guangrong rcu_read_lock(); 15101f78160cSXiao Guangrong list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) { 1511dfe25020SChris Mason if (!device->bdev) 1512dfe25020SChris Mason continue; 151304160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 151404160088SChris Mason if (bdi && bdi_congested(bdi, bdi_bits)) { 151504160088SChris Mason ret = 1; 151604160088SChris Mason break; 151704160088SChris Mason } 151804160088SChris Mason } 15191f78160cSXiao Guangrong rcu_read_unlock(); 152004160088SChris Mason return ret; 152104160088SChris Mason } 152204160088SChris Mason 152338b66988SChris Mason /* 1524ad081f14SJens Axboe * If this fails, caller must call bdi_destroy() to get rid of the 1525ad081f14SJens Axboe * bdi again. 1526ad081f14SJens Axboe */ 152704160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 152804160088SChris Mason { 1529ad081f14SJens Axboe int err; 1530ad081f14SJens Axboe 1531ad081f14SJens Axboe bdi->capabilities = BDI_CAP_MAP_COPY; 1532e6d086d8SJens Axboe err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY); 1533ad081f14SJens Axboe if (err) 1534ad081f14SJens Axboe return err; 1535ad081f14SJens Axboe 15364575c9ccSChris Mason bdi->ra_pages = default_backing_dev_info.ra_pages; 153704160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 153804160088SChris Mason bdi->congested_data = info; 153904160088SChris Mason return 0; 154004160088SChris Mason } 154104160088SChris Mason 1542ce9adaa5SChris Mason static int bio_ready_for_csum(struct bio *bio) 1543ce9adaa5SChris Mason { 1544ce9adaa5SChris Mason u64 length = 0; 1545ce9adaa5SChris Mason u64 buf_len = 0; 1546ce9adaa5SChris Mason u64 start = 0; 1547ce9adaa5SChris Mason struct page *page; 1548ce9adaa5SChris Mason struct extent_io_tree *io_tree = NULL; 1549ce9adaa5SChris Mason struct bio_vec *bvec; 1550ce9adaa5SChris Mason int i; 1551ce9adaa5SChris Mason int ret; 1552ce9adaa5SChris Mason 1553ce9adaa5SChris Mason bio_for_each_segment(bvec, bio, i) { 1554ce9adaa5SChris Mason page = bvec->bv_page; 1555ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 1556ce9adaa5SChris Mason length += bvec->bv_len; 1557ce9adaa5SChris Mason continue; 1558ce9adaa5SChris Mason } 1559ce9adaa5SChris Mason if (!page->private) { 1560ce9adaa5SChris Mason length += bvec->bv_len; 1561ce9adaa5SChris Mason continue; 1562ce9adaa5SChris Mason } 1563ce9adaa5SChris Mason length = bvec->bv_len; 1564ce9adaa5SChris Mason buf_len = page->private >> 2; 1565ce9adaa5SChris Mason start = page_offset(page) + bvec->bv_offset; 1566ce9adaa5SChris Mason io_tree = &BTRFS_I(page->mapping->host)->io_tree; 1567ce9adaa5SChris Mason } 1568ce9adaa5SChris Mason /* are we fully contained in this bio? */ 1569ce9adaa5SChris Mason if (buf_len <= length) 1570ce9adaa5SChris Mason return 1; 1571ce9adaa5SChris Mason 1572ce9adaa5SChris Mason ret = extent_range_uptodate(io_tree, start + length, 1573ce9adaa5SChris Mason start + buf_len - 1); 1574ce9adaa5SChris Mason return ret; 1575ce9adaa5SChris Mason } 1576ce9adaa5SChris Mason 15778b712842SChris Mason /* 15788b712842SChris Mason * called by the kthread helper functions to finally call the bio end_io 15798b712842SChris Mason * functions. This is where read checksum verification actually happens 15808b712842SChris Mason */ 15818b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work) 1582ce9adaa5SChris Mason { 1583ce9adaa5SChris Mason struct bio *bio; 15848b712842SChris Mason struct end_io_wq *end_io_wq; 15858b712842SChris Mason struct btrfs_fs_info *fs_info; 1586ce9adaa5SChris Mason int error; 1587ce9adaa5SChris Mason 15888b712842SChris Mason end_io_wq = container_of(work, struct end_io_wq, work); 1589ce9adaa5SChris Mason bio = end_io_wq->bio; 15908b712842SChris Mason fs_info = end_io_wq->info; 15918b712842SChris Mason 1592cad321adSChris Mason /* metadata bio reads are special because the whole tree block must 15938b712842SChris Mason * be checksummed at once. This makes sure the entire block is in 15948b712842SChris Mason * ram and up to date before trying to verify things. For 15958b712842SChris Mason * blocksize <= pagesize, it is basically a noop 15968b712842SChris Mason */ 15977b6d91daSChristoph Hellwig if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata && 1598cad321adSChris Mason !bio_ready_for_csum(bio)) { 1599d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_meta_workers, 16008b712842SChris Mason &end_io_wq->work); 1601ce9adaa5SChris Mason return; 1602ce9adaa5SChris Mason } 1603ce9adaa5SChris Mason error = end_io_wq->error; 1604ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1605ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 1606ce9adaa5SChris Mason kfree(end_io_wq); 1607ce9adaa5SChris Mason bio_endio(bio, error); 1608ce9adaa5SChris Mason } 160944b8bd7eSChris Mason 1610a74a4b97SChris Mason static int cleaner_kthread(void *arg) 1611a74a4b97SChris Mason { 1612a74a4b97SChris Mason struct btrfs_root *root = arg; 1613a74a4b97SChris Mason 1614a74a4b97SChris Mason do { 1615a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 161676dda93cSYan, Zheng 161776dda93cSYan, Zheng if (!(root->fs_info->sb->s_flags & MS_RDONLY) && 161876dda93cSYan, Zheng mutex_trylock(&root->fs_info->cleaner_mutex)) { 161924bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 1620a74a4b97SChris Mason btrfs_clean_old_snapshots(root); 1621a74a4b97SChris Mason mutex_unlock(&root->fs_info->cleaner_mutex); 16224cb5300bSChris Mason btrfs_run_defrag_inodes(root->fs_info); 162376dda93cSYan, Zheng } 1624a74a4b97SChris Mason 1625a0acae0eSTejun Heo if (!try_to_freeze()) { 1626a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 16278929ecfaSYan, Zheng if (!kthread_should_stop()) 1628a74a4b97SChris Mason schedule(); 1629a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1630a74a4b97SChris Mason } 1631a74a4b97SChris Mason } while (!kthread_should_stop()); 1632a74a4b97SChris Mason return 0; 1633a74a4b97SChris Mason } 1634a74a4b97SChris Mason 1635a74a4b97SChris Mason static int transaction_kthread(void *arg) 1636a74a4b97SChris Mason { 1637a74a4b97SChris Mason struct btrfs_root *root = arg; 1638a74a4b97SChris Mason struct btrfs_trans_handle *trans; 1639a74a4b97SChris Mason struct btrfs_transaction *cur; 16408929ecfaSYan, Zheng u64 transid; 1641a74a4b97SChris Mason unsigned long now; 1642a74a4b97SChris Mason unsigned long delay; 1643914b2007SJan Kara bool cannot_commit; 1644a74a4b97SChris Mason 1645a74a4b97SChris Mason do { 1646914b2007SJan Kara cannot_commit = false; 1647a74a4b97SChris Mason delay = HZ * 30; 1648a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 1649a74a4b97SChris Mason mutex_lock(&root->fs_info->transaction_kthread_mutex); 1650a74a4b97SChris Mason 1651a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1652a74a4b97SChris Mason cur = root->fs_info->running_transaction; 1653a74a4b97SChris Mason if (!cur) { 1654a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1655a74a4b97SChris Mason goto sleep; 1656a74a4b97SChris Mason } 165731153d81SYan Zheng 1658a74a4b97SChris Mason now = get_seconds(); 16598929ecfaSYan, Zheng if (!cur->blocked && 16608929ecfaSYan, Zheng (now < cur->start_time || now - cur->start_time < 30)) { 1661a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1662a74a4b97SChris Mason delay = HZ * 5; 1663a74a4b97SChris Mason goto sleep; 1664a74a4b97SChris Mason } 16658929ecfaSYan, Zheng transid = cur->transid; 1666a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 166756bec294SChris Mason 166879787eaaSJeff Mahoney /* If the file system is aborted, this will always fail. */ 16697a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 1670914b2007SJan Kara if (IS_ERR(trans)) { 1671914b2007SJan Kara cannot_commit = true; 167279787eaaSJeff Mahoney goto sleep; 1673914b2007SJan Kara } 16748929ecfaSYan, Zheng if (transid == trans->transid) { 167579787eaaSJeff Mahoney btrfs_commit_transaction(trans, root); 16768929ecfaSYan, Zheng } else { 16778929ecfaSYan, Zheng btrfs_end_transaction(trans, root); 16788929ecfaSYan, Zheng } 1679a74a4b97SChris Mason sleep: 1680a74a4b97SChris Mason wake_up_process(root->fs_info->cleaner_kthread); 1681a74a4b97SChris Mason mutex_unlock(&root->fs_info->transaction_kthread_mutex); 1682a74a4b97SChris Mason 1683a0acae0eSTejun Heo if (!try_to_freeze()) { 1684a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 16858929ecfaSYan, Zheng if (!kthread_should_stop() && 1686914b2007SJan Kara (!btrfs_transaction_blocked(root->fs_info) || 1687914b2007SJan Kara cannot_commit)) 1688a74a4b97SChris Mason schedule_timeout(delay); 1689a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1690a74a4b97SChris Mason } 1691a74a4b97SChris Mason } while (!kthread_should_stop()); 1692a74a4b97SChris Mason return 0; 1693a74a4b97SChris Mason } 1694a74a4b97SChris Mason 1695af31f5e5SChris Mason /* 1696af31f5e5SChris Mason * this will find the highest generation in the array of 1697af31f5e5SChris Mason * root backups. The index of the highest array is returned, 1698af31f5e5SChris Mason * or -1 if we can't find anything. 1699af31f5e5SChris Mason * 1700af31f5e5SChris Mason * We check to make sure the array is valid by comparing the 1701af31f5e5SChris Mason * generation of the latest root in the array with the generation 1702af31f5e5SChris Mason * in the super block. If they don't match we pitch it. 1703af31f5e5SChris Mason */ 1704af31f5e5SChris Mason static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen) 1705af31f5e5SChris Mason { 1706af31f5e5SChris Mason u64 cur; 1707af31f5e5SChris Mason int newest_index = -1; 1708af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1709af31f5e5SChris Mason int i; 1710af31f5e5SChris Mason 1711af31f5e5SChris Mason for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { 1712af31f5e5SChris Mason root_backup = info->super_copy->super_roots + i; 1713af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1714af31f5e5SChris Mason if (cur == newest_gen) 1715af31f5e5SChris Mason newest_index = i; 1716af31f5e5SChris Mason } 1717af31f5e5SChris Mason 1718af31f5e5SChris Mason /* check to see if we actually wrapped around */ 1719af31f5e5SChris Mason if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) { 1720af31f5e5SChris Mason root_backup = info->super_copy->super_roots; 1721af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1722af31f5e5SChris Mason if (cur == newest_gen) 1723af31f5e5SChris Mason newest_index = 0; 1724af31f5e5SChris Mason } 1725af31f5e5SChris Mason return newest_index; 1726af31f5e5SChris Mason } 1727af31f5e5SChris Mason 1728af31f5e5SChris Mason 1729af31f5e5SChris Mason /* 1730af31f5e5SChris Mason * find the oldest backup so we know where to store new entries 1731af31f5e5SChris Mason * in the backup array. This will set the backup_root_index 1732af31f5e5SChris Mason * field in the fs_info struct 1733af31f5e5SChris Mason */ 1734af31f5e5SChris Mason static void find_oldest_super_backup(struct btrfs_fs_info *info, 1735af31f5e5SChris Mason u64 newest_gen) 1736af31f5e5SChris Mason { 1737af31f5e5SChris Mason int newest_index = -1; 1738af31f5e5SChris Mason 1739af31f5e5SChris Mason newest_index = find_newest_super_backup(info, newest_gen); 1740af31f5e5SChris Mason /* if there was garbage in there, just move along */ 1741af31f5e5SChris Mason if (newest_index == -1) { 1742af31f5e5SChris Mason info->backup_root_index = 0; 1743af31f5e5SChris Mason } else { 1744af31f5e5SChris Mason info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS; 1745af31f5e5SChris Mason } 1746af31f5e5SChris Mason } 1747af31f5e5SChris Mason 1748af31f5e5SChris Mason /* 1749af31f5e5SChris Mason * copy all the root pointers into the super backup array. 1750af31f5e5SChris Mason * this will bump the backup pointer by one when it is 1751af31f5e5SChris Mason * done 1752af31f5e5SChris Mason */ 1753af31f5e5SChris Mason static void backup_super_roots(struct btrfs_fs_info *info) 1754af31f5e5SChris Mason { 1755af31f5e5SChris Mason int next_backup; 1756af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1757af31f5e5SChris Mason int last_backup; 1758af31f5e5SChris Mason 1759af31f5e5SChris Mason next_backup = info->backup_root_index; 1760af31f5e5SChris Mason last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) % 1761af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 1762af31f5e5SChris Mason 1763af31f5e5SChris Mason /* 1764af31f5e5SChris Mason * just overwrite the last backup if we're at the same generation 1765af31f5e5SChris Mason * this happens only at umount 1766af31f5e5SChris Mason */ 1767af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + last_backup; 1768af31f5e5SChris Mason if (btrfs_backup_tree_root_gen(root_backup) == 1769af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)) 1770af31f5e5SChris Mason next_backup = last_backup; 1771af31f5e5SChris Mason 1772af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + next_backup; 1773af31f5e5SChris Mason 1774af31f5e5SChris Mason /* 1775af31f5e5SChris Mason * make sure all of our padding and empty slots get zero filled 1776af31f5e5SChris Mason * regardless of which ones we use today 1777af31f5e5SChris Mason */ 1778af31f5e5SChris Mason memset(root_backup, 0, sizeof(*root_backup)); 1779af31f5e5SChris Mason 1780af31f5e5SChris Mason info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS; 1781af31f5e5SChris Mason 1782af31f5e5SChris Mason btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start); 1783af31f5e5SChris Mason btrfs_set_backup_tree_root_gen(root_backup, 1784af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)); 1785af31f5e5SChris Mason 1786af31f5e5SChris Mason btrfs_set_backup_tree_root_level(root_backup, 1787af31f5e5SChris Mason btrfs_header_level(info->tree_root->node)); 1788af31f5e5SChris Mason 1789af31f5e5SChris Mason btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start); 1790af31f5e5SChris Mason btrfs_set_backup_chunk_root_gen(root_backup, 1791af31f5e5SChris Mason btrfs_header_generation(info->chunk_root->node)); 1792af31f5e5SChris Mason btrfs_set_backup_chunk_root_level(root_backup, 1793af31f5e5SChris Mason btrfs_header_level(info->chunk_root->node)); 1794af31f5e5SChris Mason 1795af31f5e5SChris Mason btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start); 1796af31f5e5SChris Mason btrfs_set_backup_extent_root_gen(root_backup, 1797af31f5e5SChris Mason btrfs_header_generation(info->extent_root->node)); 1798af31f5e5SChris Mason btrfs_set_backup_extent_root_level(root_backup, 1799af31f5e5SChris Mason btrfs_header_level(info->extent_root->node)); 1800af31f5e5SChris Mason 18017c7e82a7SChris Mason /* 18027c7e82a7SChris Mason * we might commit during log recovery, which happens before we set 18037c7e82a7SChris Mason * the fs_root. Make sure it is valid before we fill it in. 18047c7e82a7SChris Mason */ 18057c7e82a7SChris Mason if (info->fs_root && info->fs_root->node) { 18067c7e82a7SChris Mason btrfs_set_backup_fs_root(root_backup, 18077c7e82a7SChris Mason info->fs_root->node->start); 1808af31f5e5SChris Mason btrfs_set_backup_fs_root_gen(root_backup, 1809af31f5e5SChris Mason btrfs_header_generation(info->fs_root->node)); 1810af31f5e5SChris Mason btrfs_set_backup_fs_root_level(root_backup, 1811af31f5e5SChris Mason btrfs_header_level(info->fs_root->node)); 18127c7e82a7SChris Mason } 1813af31f5e5SChris Mason 1814af31f5e5SChris Mason btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start); 1815af31f5e5SChris Mason btrfs_set_backup_dev_root_gen(root_backup, 1816af31f5e5SChris Mason btrfs_header_generation(info->dev_root->node)); 1817af31f5e5SChris Mason btrfs_set_backup_dev_root_level(root_backup, 1818af31f5e5SChris Mason btrfs_header_level(info->dev_root->node)); 1819af31f5e5SChris Mason 1820af31f5e5SChris Mason btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start); 1821af31f5e5SChris Mason btrfs_set_backup_csum_root_gen(root_backup, 1822af31f5e5SChris Mason btrfs_header_generation(info->csum_root->node)); 1823af31f5e5SChris Mason btrfs_set_backup_csum_root_level(root_backup, 1824af31f5e5SChris Mason btrfs_header_level(info->csum_root->node)); 1825af31f5e5SChris Mason 1826af31f5e5SChris Mason btrfs_set_backup_total_bytes(root_backup, 1827af31f5e5SChris Mason btrfs_super_total_bytes(info->super_copy)); 1828af31f5e5SChris Mason btrfs_set_backup_bytes_used(root_backup, 1829af31f5e5SChris Mason btrfs_super_bytes_used(info->super_copy)); 1830af31f5e5SChris Mason btrfs_set_backup_num_devices(root_backup, 1831af31f5e5SChris Mason btrfs_super_num_devices(info->super_copy)); 1832af31f5e5SChris Mason 1833af31f5e5SChris Mason /* 1834af31f5e5SChris Mason * if we don't copy this out to the super_copy, it won't get remembered 1835af31f5e5SChris Mason * for the next commit 1836af31f5e5SChris Mason */ 1837af31f5e5SChris Mason memcpy(&info->super_copy->super_roots, 1838af31f5e5SChris Mason &info->super_for_commit->super_roots, 1839af31f5e5SChris Mason sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS); 1840af31f5e5SChris Mason } 1841af31f5e5SChris Mason 1842af31f5e5SChris Mason /* 1843af31f5e5SChris Mason * this copies info out of the root backup array and back into 1844af31f5e5SChris Mason * the in-memory super block. It is meant to help iterate through 1845af31f5e5SChris Mason * the array, so you send it the number of backups you've already 1846af31f5e5SChris Mason * tried and the last backup index you used. 1847af31f5e5SChris Mason * 1848af31f5e5SChris Mason * this returns -1 when it has tried all the backups 1849af31f5e5SChris Mason */ 1850af31f5e5SChris Mason static noinline int next_root_backup(struct btrfs_fs_info *info, 1851af31f5e5SChris Mason struct btrfs_super_block *super, 1852af31f5e5SChris Mason int *num_backups_tried, int *backup_index) 1853af31f5e5SChris Mason { 1854af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1855af31f5e5SChris Mason int newest = *backup_index; 1856af31f5e5SChris Mason 1857af31f5e5SChris Mason if (*num_backups_tried == 0) { 1858af31f5e5SChris Mason u64 gen = btrfs_super_generation(super); 1859af31f5e5SChris Mason 1860af31f5e5SChris Mason newest = find_newest_super_backup(info, gen); 1861af31f5e5SChris Mason if (newest == -1) 1862af31f5e5SChris Mason return -1; 1863af31f5e5SChris Mason 1864af31f5e5SChris Mason *backup_index = newest; 1865af31f5e5SChris Mason *num_backups_tried = 1; 1866af31f5e5SChris Mason } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) { 1867af31f5e5SChris Mason /* we've tried all the backups, all done */ 1868af31f5e5SChris Mason return -1; 1869af31f5e5SChris Mason } else { 1870af31f5e5SChris Mason /* jump to the next oldest backup */ 1871af31f5e5SChris Mason newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) % 1872af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 1873af31f5e5SChris Mason *backup_index = newest; 1874af31f5e5SChris Mason *num_backups_tried += 1; 1875af31f5e5SChris Mason } 1876af31f5e5SChris Mason root_backup = super->super_roots + newest; 1877af31f5e5SChris Mason 1878af31f5e5SChris Mason btrfs_set_super_generation(super, 1879af31f5e5SChris Mason btrfs_backup_tree_root_gen(root_backup)); 1880af31f5e5SChris Mason btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup)); 1881af31f5e5SChris Mason btrfs_set_super_root_level(super, 1882af31f5e5SChris Mason btrfs_backup_tree_root_level(root_backup)); 1883af31f5e5SChris Mason btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup)); 1884af31f5e5SChris Mason 1885af31f5e5SChris Mason /* 1886af31f5e5SChris Mason * fixme: the total bytes and num_devices need to match or we should 1887af31f5e5SChris Mason * need a fsck 1888af31f5e5SChris Mason */ 1889af31f5e5SChris Mason btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup)); 1890af31f5e5SChris Mason btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup)); 1891af31f5e5SChris Mason return 0; 1892af31f5e5SChris Mason } 1893af31f5e5SChris Mason 1894af31f5e5SChris Mason /* helper to cleanup tree roots */ 1895af31f5e5SChris Mason static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root) 1896af31f5e5SChris Mason { 1897af31f5e5SChris Mason free_extent_buffer(info->tree_root->node); 1898af31f5e5SChris Mason free_extent_buffer(info->tree_root->commit_root); 1899af31f5e5SChris Mason free_extent_buffer(info->dev_root->node); 1900af31f5e5SChris Mason free_extent_buffer(info->dev_root->commit_root); 1901af31f5e5SChris Mason free_extent_buffer(info->extent_root->node); 1902af31f5e5SChris Mason free_extent_buffer(info->extent_root->commit_root); 1903af31f5e5SChris Mason free_extent_buffer(info->csum_root->node); 1904af31f5e5SChris Mason free_extent_buffer(info->csum_root->commit_root); 1905af31f5e5SChris Mason 1906af31f5e5SChris Mason info->tree_root->node = NULL; 1907af31f5e5SChris Mason info->tree_root->commit_root = NULL; 1908af31f5e5SChris Mason info->dev_root->node = NULL; 1909af31f5e5SChris Mason info->dev_root->commit_root = NULL; 1910af31f5e5SChris Mason info->extent_root->node = NULL; 1911af31f5e5SChris Mason info->extent_root->commit_root = NULL; 1912af31f5e5SChris Mason info->csum_root->node = NULL; 1913af31f5e5SChris Mason info->csum_root->commit_root = NULL; 1914af31f5e5SChris Mason 1915af31f5e5SChris Mason if (chunk_root) { 1916af31f5e5SChris Mason free_extent_buffer(info->chunk_root->node); 1917af31f5e5SChris Mason free_extent_buffer(info->chunk_root->commit_root); 1918af31f5e5SChris Mason info->chunk_root->node = NULL; 1919af31f5e5SChris Mason info->chunk_root->commit_root = NULL; 1920af31f5e5SChris Mason } 1921af31f5e5SChris Mason } 1922af31f5e5SChris Mason 1923af31f5e5SChris Mason 1924ad2b2c80SAl Viro int open_ctree(struct super_block *sb, 1925dfe25020SChris Mason struct btrfs_fs_devices *fs_devices, 1926dfe25020SChris Mason char *options) 1927eb60ceacSChris Mason { 1928db94535dSChris Mason u32 sectorsize; 1929db94535dSChris Mason u32 nodesize; 1930db94535dSChris Mason u32 leafsize; 1931db94535dSChris Mason u32 blocksize; 193287ee04ebSChris Mason u32 stripesize; 193384234f3aSYan Zheng u64 generation; 1934f2b636e8SJosef Bacik u64 features; 19353de4586cSChris Mason struct btrfs_key location; 1936a061fc8dSChris Mason struct buffer_head *bh; 19374d34b278SIlya Dryomov struct btrfs_super_block *disk_super; 1938815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1939f84a8bd6SAl Viro struct btrfs_root *tree_root; 19404d34b278SIlya Dryomov struct btrfs_root *extent_root; 19414d34b278SIlya Dryomov struct btrfs_root *csum_root; 19424d34b278SIlya Dryomov struct btrfs_root *chunk_root; 19434d34b278SIlya Dryomov struct btrfs_root *dev_root; 1944e02119d5SChris Mason struct btrfs_root *log_tree_root; 1945eb60ceacSChris Mason int ret; 1946e58ca020SYan int err = -EINVAL; 1947af31f5e5SChris Mason int num_backups_tried = 0; 1948af31f5e5SChris Mason int backup_index = 0; 19494543df7eSChris Mason 1950f84a8bd6SAl Viro tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info); 19516f07e42eSAl Viro extent_root = fs_info->extent_root = btrfs_alloc_root(fs_info); 19526f07e42eSAl Viro csum_root = fs_info->csum_root = btrfs_alloc_root(fs_info); 19536f07e42eSAl Viro chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info); 19546f07e42eSAl Viro dev_root = fs_info->dev_root = btrfs_alloc_root(fs_info); 19558790d502SChris Mason 1956f84a8bd6SAl Viro if (!tree_root || !extent_root || !csum_root || 1957f84a8bd6SAl Viro !chunk_root || !dev_root) { 195839279cc3SChris Mason err = -ENOMEM; 195939279cc3SChris Mason goto fail; 196039279cc3SChris Mason } 196176dda93cSYan, Zheng 196276dda93cSYan, Zheng ret = init_srcu_struct(&fs_info->subvol_srcu); 196376dda93cSYan, Zheng if (ret) { 196476dda93cSYan, Zheng err = ret; 196576dda93cSYan, Zheng goto fail; 196676dda93cSYan, Zheng } 196776dda93cSYan, Zheng 196876dda93cSYan, Zheng ret = setup_bdi(fs_info, &fs_info->bdi); 196976dda93cSYan, Zheng if (ret) { 197076dda93cSYan, Zheng err = ret; 197176dda93cSYan, Zheng goto fail_srcu; 197276dda93cSYan, Zheng } 197376dda93cSYan, Zheng 197476dda93cSYan, Zheng fs_info->btree_inode = new_inode(sb); 197576dda93cSYan, Zheng if (!fs_info->btree_inode) { 197676dda93cSYan, Zheng err = -ENOMEM; 197776dda93cSYan, Zheng goto fail_bdi; 197876dda93cSYan, Zheng } 197976dda93cSYan, Zheng 1980a6591715SChris Mason mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); 19811561dedaSMiao Xie 198276dda93cSYan, Zheng INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); 19838fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 1984facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 198524bbcf04SYan, Zheng INIT_LIST_HEAD(&fs_info->delayed_iputs); 198619c00ddcSChris Mason INIT_LIST_HEAD(&fs_info->hashers); 1987ea8c2819SChris Mason INIT_LIST_HEAD(&fs_info->delalloc_inodes); 19885a3f23d5SChris Mason INIT_LIST_HEAD(&fs_info->ordered_operations); 198911833d66SYan Zheng INIT_LIST_HEAD(&fs_info->caching_block_groups); 19901832a6d5SChris Mason spin_lock_init(&fs_info->delalloc_lock); 1991a4abeea4SJosef Bacik spin_lock_init(&fs_info->trans_lock); 199231153d81SYan Zheng spin_lock_init(&fs_info->ref_cache_lock); 199376dda93cSYan, Zheng spin_lock_init(&fs_info->fs_roots_radix_lock); 199424bbcf04SYan, Zheng spin_lock_init(&fs_info->delayed_iput_lock); 19954cb5300bSChris Mason spin_lock_init(&fs_info->defrag_inodes_lock); 19962bf64758SJosef Bacik spin_lock_init(&fs_info->free_chunk_lock); 19977585717fSChris Mason mutex_init(&fs_info->reloc_mutex); 199819c00ddcSChris Mason 199958176a96SJosef Bacik init_completion(&fs_info->kobj_unregister); 20000b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 20016324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 20020b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 2003f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->global_block_rsv); 2004f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->delalloc_block_rsv); 2005f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->trans_block_rsv); 2006f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->chunk_block_rsv); 2007f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->empty_block_rsv); 20086d668ddaSJosef Bacik btrfs_init_block_rsv(&fs_info->delayed_block_rsv); 2009cb03c743SChris Mason atomic_set(&fs_info->nr_async_submits, 0); 2010771ed689SChris Mason atomic_set(&fs_info->async_delalloc_pages, 0); 20118c8bee1dSChris Mason atomic_set(&fs_info->async_submit_draining, 0); 20120986fe9eSChris Mason atomic_set(&fs_info->nr_async_bios, 0); 20134cb5300bSChris Mason atomic_set(&fs_info->defrag_running, 0); 2014e20d96d6SChris Mason fs_info->sb = sb; 20156f568d35SChris Mason fs_info->max_inline = 8192 * 1024; 20169ed74f2dSJosef Bacik fs_info->metadata_ratio = 0; 20174cb5300bSChris Mason fs_info->defrag_inodes = RB_ROOT; 2018a4abeea4SJosef Bacik fs_info->trans_no_join = 0; 20192bf64758SJosef Bacik fs_info->free_chunk_space = 0; 2020c8b97818SChris Mason 202190519d66SArne Jansen /* readahead state */ 202290519d66SArne Jansen INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT); 202390519d66SArne Jansen spin_lock_init(&fs_info->reada_lock); 20242c90e5d6SChris Mason 2025b34b086cSChris Mason fs_info->thread_pool_size = min_t(unsigned long, 2026b34b086cSChris Mason num_online_cpus() + 2, 8); 20270afbaf8cSChris Mason 20283eaa2885SChris Mason INIT_LIST_HEAD(&fs_info->ordered_extents); 20293eaa2885SChris Mason spin_lock_init(&fs_info->ordered_extent_lock); 203016cdcec7SMiao Xie fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), 203116cdcec7SMiao Xie GFP_NOFS); 203216cdcec7SMiao Xie if (!fs_info->delayed_root) { 203316cdcec7SMiao Xie err = -ENOMEM; 203416cdcec7SMiao Xie goto fail_iput; 203516cdcec7SMiao Xie } 203616cdcec7SMiao Xie btrfs_init_delayed_root(fs_info->delayed_root); 20373eaa2885SChris Mason 2038a2de733cSArne Jansen mutex_init(&fs_info->scrub_lock); 2039a2de733cSArne Jansen atomic_set(&fs_info->scrubs_running, 0); 2040a2de733cSArne Jansen atomic_set(&fs_info->scrub_pause_req, 0); 2041a2de733cSArne Jansen atomic_set(&fs_info->scrubs_paused, 0); 2042a2de733cSArne Jansen atomic_set(&fs_info->scrub_cancel_req, 0); 2043a2de733cSArne Jansen init_waitqueue_head(&fs_info->scrub_pause_wait); 2044a2de733cSArne Jansen init_rwsem(&fs_info->scrub_super_lock); 2045a2de733cSArne Jansen fs_info->scrub_workers_refcnt = 0; 204621adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 204721adbd5cSStefan Behrens fs_info->check_integrity_print_mask = 0; 204821adbd5cSStefan Behrens #endif 2049a2de733cSArne Jansen 2050c9e9f97bSIlya Dryomov spin_lock_init(&fs_info->balance_lock); 2051c9e9f97bSIlya Dryomov mutex_init(&fs_info->balance_mutex); 2052837d5b6eSIlya Dryomov atomic_set(&fs_info->balance_running, 0); 2053837d5b6eSIlya Dryomov atomic_set(&fs_info->balance_pause_req, 0); 2054a7e99c69SIlya Dryomov atomic_set(&fs_info->balance_cancel_req, 0); 2055c9e9f97bSIlya Dryomov fs_info->balance_ctl = NULL; 2056837d5b6eSIlya Dryomov init_waitqueue_head(&fs_info->balance_wait_q); 2057a061fc8dSChris Mason 20580afbaf8cSChris Mason sb->s_blocksize = 4096; 20590afbaf8cSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 206032a88aa1SJens Axboe sb->s_bdi = &fs_info->bdi; 20610afbaf8cSChris Mason 206276dda93cSYan, Zheng fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; 2063bfe86848SMiklos Szeredi set_nlink(fs_info->btree_inode, 1); 20640afbaf8cSChris Mason /* 20650afbaf8cSChris Mason * we set the i_size on the btree inode to the max possible int. 20660afbaf8cSChris Mason * the real end of the address space is determined by all of 20670afbaf8cSChris Mason * the devices in the system 20680afbaf8cSChris Mason */ 20690afbaf8cSChris Mason fs_info->btree_inode->i_size = OFFSET_MAX; 2070d98237b3SChris Mason fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 207104160088SChris Mason fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; 207204160088SChris Mason 20735d4f98a2SYan Zheng RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); 2074d1310b2eSChris Mason extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 2075f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 2076a8067e02SDavid Sterba extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree); 20770da5468fSChris Mason 2078d1310b2eSChris Mason BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 2079d1310b2eSChris Mason 20800f7d52f4SChris Mason BTRFS_I(fs_info->btree_inode)->root = tree_root; 20810f7d52f4SChris Mason memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 20820f7d52f4SChris Mason sizeof(struct btrfs_key)); 208376dda93cSYan, Zheng BTRFS_I(fs_info->btree_inode)->dummy_inode = 1; 208422b0ebdaSChris Mason insert_inode_hash(fs_info->btree_inode); 208539279cc3SChris Mason 2086e02119d5SChris Mason spin_lock_init(&fs_info->block_group_cache_lock); 20876bef4d31SEric Paris fs_info->block_group_cache_tree = RB_ROOT; 2088925baeddSChris Mason 208911833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[0], 2090f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 209111833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[1], 2092f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 209311833d66SYan Zheng fs_info->pinned_extents = &fs_info->freed_extents[0]; 2094e6dcd2dcSChris Mason fs_info->do_barriers = 1; 2095f9295749SChris Mason 2096d98237b3SChris Mason 20975a3f23d5SChris Mason mutex_init(&fs_info->ordered_operations_mutex); 209830ae8467SChris Mason mutex_init(&fs_info->tree_log_mutex); 2099925baeddSChris Mason mutex_init(&fs_info->chunk_mutex); 2100925baeddSChris Mason mutex_init(&fs_info->transaction_kthread_mutex); 2101a74a4b97SChris Mason mutex_init(&fs_info->cleaner_mutex); 2102a74a4b97SChris Mason mutex_init(&fs_info->volume_mutex); 2103276e680dSYan Zheng init_rwsem(&fs_info->extent_commit_sem); 2104c71bf099SYan, Zheng init_rwsem(&fs_info->cleanup_work_sem); 210576dda93cSYan, Zheng init_rwsem(&fs_info->subvol_sem); 2106fa9c0d79SChris Mason 2107fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); 2108fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->data_alloc_cluster); 2109fa9c0d79SChris Mason 21107d9eb12cSChris Mason init_waitqueue_head(&fs_info->transaction_throttle); 21113768f368SChris Mason init_waitqueue_head(&fs_info->transaction_wait); 2112bb9c12c9SSage Weil init_waitqueue_head(&fs_info->transaction_blocked_wait); 21134854ddd0SChris Mason init_waitqueue_head(&fs_info->async_submit_wait); 21149a8dd150SChris Mason 21150b86a832SChris Mason __setup_root(4096, 4096, 4096, 4096, tree_root, 21162c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 21177eccb903SChris Mason 2118a512bbf8SYan Zheng bh = btrfs_read_dev_super(fs_devices->latest_bdev); 211920b45077SDave Young if (!bh) { 212020b45077SDave Young err = -EINVAL; 212116cdcec7SMiao Xie goto fail_alloc; 212220b45077SDave Young } 212339279cc3SChris Mason 21246c41761fSDavid Sterba memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy)); 21256c41761fSDavid Sterba memcpy(fs_info->super_for_commit, fs_info->super_copy, 21266c41761fSDavid Sterba sizeof(*fs_info->super_for_commit)); 2127a061fc8dSChris Mason brelse(bh); 21285f39d397SChris Mason 21296c41761fSDavid Sterba memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); 21300b86a832SChris Mason 21316c41761fSDavid Sterba disk_super = fs_info->super_copy; 21320f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 213316cdcec7SMiao Xie goto fail_alloc; 21340f7d52f4SChris Mason 2135acce952bSliubo /* check FS state, whether FS is broken. */ 2136acce952bSliubo fs_info->fs_state |= btrfs_super_flags(disk_super); 2137acce952bSliubo 2138acce952bSliubo btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); 2139acce952bSliubo 214075e7cb7fSLiu Bo /* 2141af31f5e5SChris Mason * run through our array of backup supers and setup 2142af31f5e5SChris Mason * our ring pointer to the oldest one 2143af31f5e5SChris Mason */ 2144af31f5e5SChris Mason generation = btrfs_super_generation(disk_super); 2145af31f5e5SChris Mason find_oldest_super_backup(fs_info, generation); 2146af31f5e5SChris Mason 2147af31f5e5SChris Mason /* 214875e7cb7fSLiu Bo * In the long term, we'll store the compression type in the super 214975e7cb7fSLiu Bo * block, and it'll be used for per file compression control. 215075e7cb7fSLiu Bo */ 215175e7cb7fSLiu Bo fs_info->compress_type = BTRFS_COMPRESS_ZLIB; 215275e7cb7fSLiu Bo 21532b82032cSYan Zheng ret = btrfs_parse_options(tree_root, options); 21542b82032cSYan Zheng if (ret) { 21552b82032cSYan Zheng err = ret; 215616cdcec7SMiao Xie goto fail_alloc; 21572b82032cSYan Zheng } 2158dfe25020SChris Mason 2159f2b636e8SJosef Bacik features = btrfs_super_incompat_flags(disk_super) & 2160f2b636e8SJosef Bacik ~BTRFS_FEATURE_INCOMPAT_SUPP; 2161f2b636e8SJosef Bacik if (features) { 2162f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount because of " 2163f2b636e8SJosef Bacik "unsupported optional features (%Lx).\n", 216421380931SJoel Becker (unsigned long long)features); 2165f2b636e8SJosef Bacik err = -EINVAL; 216616cdcec7SMiao Xie goto fail_alloc; 2167f2b636e8SJosef Bacik } 2168f2b636e8SJosef Bacik 21695d4f98a2SYan Zheng features = btrfs_super_incompat_flags(disk_super); 21705d4f98a2SYan Zheng features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; 2171a6fa6faeSLi Zefan if (tree_root->fs_info->compress_type & BTRFS_COMPRESS_LZO) 2172a6fa6faeSLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 21735d4f98a2SYan Zheng btrfs_set_super_incompat_flags(disk_super, features); 21745d4f98a2SYan Zheng 2175f2b636e8SJosef Bacik features = btrfs_super_compat_ro_flags(disk_super) & 2176f2b636e8SJosef Bacik ~BTRFS_FEATURE_COMPAT_RO_SUPP; 2177f2b636e8SJosef Bacik if (!(sb->s_flags & MS_RDONLY) && features) { 2178f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " 2179f2b636e8SJosef Bacik "unsupported option features (%Lx).\n", 218021380931SJoel Becker (unsigned long long)features); 2181f2b636e8SJosef Bacik err = -EINVAL; 218216cdcec7SMiao Xie goto fail_alloc; 2183f2b636e8SJosef Bacik } 218461d92c32SChris Mason 218561d92c32SChris Mason btrfs_init_workers(&fs_info->generic_worker, 218661d92c32SChris Mason "genwork", 1, NULL); 218761d92c32SChris Mason 21885443be45SChris Mason btrfs_init_workers(&fs_info->workers, "worker", 218961d92c32SChris Mason fs_info->thread_pool_size, 219061d92c32SChris Mason &fs_info->generic_worker); 2191c8b97818SChris Mason 2192771ed689SChris Mason btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", 219361d92c32SChris Mason fs_info->thread_pool_size, 219461d92c32SChris Mason &fs_info->generic_worker); 2195771ed689SChris Mason 21965443be45SChris Mason btrfs_init_workers(&fs_info->submit_workers, "submit", 2197b720d209SChris Mason min_t(u64, fs_devices->num_devices, 219861d92c32SChris Mason fs_info->thread_pool_size), 219961d92c32SChris Mason &fs_info->generic_worker); 220061b49440SChris Mason 2201bab39bf9SJosef Bacik btrfs_init_workers(&fs_info->caching_workers, "cache", 2202bab39bf9SJosef Bacik 2, &fs_info->generic_worker); 2203bab39bf9SJosef Bacik 220461b49440SChris Mason /* a higher idle thresh on the submit workers makes it much more 220561b49440SChris Mason * likely that bios will be send down in a sane order to the 220661b49440SChris Mason * devices 220761b49440SChris Mason */ 220861b49440SChris Mason fs_info->submit_workers.idle_thresh = 64; 220953863232SChris Mason 2210771ed689SChris Mason fs_info->workers.idle_thresh = 16; 22114a69a410SChris Mason fs_info->workers.ordered = 1; 221261b49440SChris Mason 2213771ed689SChris Mason fs_info->delalloc_workers.idle_thresh = 2; 2214771ed689SChris Mason fs_info->delalloc_workers.ordered = 1; 2215771ed689SChris Mason 221661d92c32SChris Mason btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, 221761d92c32SChris Mason &fs_info->generic_worker); 22185443be45SChris Mason btrfs_init_workers(&fs_info->endio_workers, "endio", 221961d92c32SChris Mason fs_info->thread_pool_size, 222061d92c32SChris Mason &fs_info->generic_worker); 2221d20f7043SChris Mason btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", 222261d92c32SChris Mason fs_info->thread_pool_size, 222361d92c32SChris Mason &fs_info->generic_worker); 2224cad321adSChris Mason btrfs_init_workers(&fs_info->endio_meta_write_workers, 222561d92c32SChris Mason "endio-meta-write", fs_info->thread_pool_size, 222661d92c32SChris Mason &fs_info->generic_worker); 22275443be45SChris Mason btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", 222861d92c32SChris Mason fs_info->thread_pool_size, 222961d92c32SChris Mason &fs_info->generic_worker); 22300cb59c99SJosef Bacik btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write", 22310cb59c99SJosef Bacik 1, &fs_info->generic_worker); 223216cdcec7SMiao Xie btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta", 223316cdcec7SMiao Xie fs_info->thread_pool_size, 223416cdcec7SMiao Xie &fs_info->generic_worker); 223590519d66SArne Jansen btrfs_init_workers(&fs_info->readahead_workers, "readahead", 223690519d66SArne Jansen fs_info->thread_pool_size, 223790519d66SArne Jansen &fs_info->generic_worker); 223861b49440SChris Mason 223961b49440SChris Mason /* 224061b49440SChris Mason * endios are largely parallel and should have a very 224161b49440SChris Mason * low idle thresh 224261b49440SChris Mason */ 224361b49440SChris Mason fs_info->endio_workers.idle_thresh = 4; 2244b51912c9SChris Mason fs_info->endio_meta_workers.idle_thresh = 4; 2245b51912c9SChris Mason 22469042846bSChris Mason fs_info->endio_write_workers.idle_thresh = 2; 22479042846bSChris Mason fs_info->endio_meta_write_workers.idle_thresh = 2; 224890519d66SArne Jansen fs_info->readahead_workers.idle_thresh = 2; 22499042846bSChris Mason 22500dc3b84aSJosef Bacik /* 22510dc3b84aSJosef Bacik * btrfs_start_workers can really only fail because of ENOMEM so just 22520dc3b84aSJosef Bacik * return -ENOMEM if any of these fail. 22530dc3b84aSJosef Bacik */ 22540dc3b84aSJosef Bacik ret = btrfs_start_workers(&fs_info->workers); 22550dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->generic_worker); 22560dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->submit_workers); 22570dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->delalloc_workers); 22580dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->fixup_workers); 22590dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->endio_workers); 22600dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->endio_meta_workers); 22610dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->endio_meta_write_workers); 22620dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->endio_write_workers); 22630dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->endio_freespace_worker); 22640dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->delayed_workers); 22650dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->caching_workers); 22660dc3b84aSJosef Bacik ret |= btrfs_start_workers(&fs_info->readahead_workers); 22670dc3b84aSJosef Bacik if (ret) { 22680dc3b84aSJosef Bacik ret = -ENOMEM; 22690dc3b84aSJosef Bacik goto fail_sb_buffer; 22700dc3b84aSJosef Bacik } 22714543df7eSChris Mason 22724575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 2273c8b97818SChris Mason fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, 2274c8b97818SChris Mason 4 * 1024 * 1024 / PAGE_CACHE_SIZE); 22754575c9ccSChris Mason 2276db94535dSChris Mason nodesize = btrfs_super_nodesize(disk_super); 2277db94535dSChris Mason leafsize = btrfs_super_leafsize(disk_super); 2278db94535dSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 227987ee04ebSChris Mason stripesize = btrfs_super_stripesize(disk_super); 2280db94535dSChris Mason tree_root->nodesize = nodesize; 2281db94535dSChris Mason tree_root->leafsize = leafsize; 2282db94535dSChris Mason tree_root->sectorsize = sectorsize; 228387ee04ebSChris Mason tree_root->stripesize = stripesize; 2284a061fc8dSChris Mason 2285a061fc8dSChris Mason sb->s_blocksize = sectorsize; 2286a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 2287db94535dSChris Mason 228839279cc3SChris Mason if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, 228939279cc3SChris Mason sizeof(disk_super->magic))) { 2290d397712bSChris Mason printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id); 229139279cc3SChris Mason goto fail_sb_buffer; 229239279cc3SChris Mason } 229319c00ddcSChris Mason 2294941b2ddfSKeith Mannthey if (sectorsize < PAGE_SIZE) { 2295941b2ddfSKeith Mannthey printk(KERN_WARNING "btrfs: Incompatible sector size " 2296941b2ddfSKeith Mannthey "found on %s\n", sb->s_id); 2297941b2ddfSKeith Mannthey goto fail_sb_buffer; 2298941b2ddfSKeith Mannthey } 2299941b2ddfSKeith Mannthey 2300925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 2301e4404d6eSYan Zheng ret = btrfs_read_sys_array(tree_root); 2302925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 230384eed90fSChris Mason if (ret) { 2304d397712bSChris Mason printk(KERN_WARNING "btrfs: failed to read the system " 2305d397712bSChris Mason "array on %s\n", sb->s_id); 23065d4f98a2SYan Zheng goto fail_sb_buffer; 230784eed90fSChris Mason } 23080b86a832SChris Mason 23090b86a832SChris Mason blocksize = btrfs_level_size(tree_root, 23100b86a832SChris Mason btrfs_super_chunk_root_level(disk_super)); 231184234f3aSYan Zheng generation = btrfs_super_chunk_root_generation(disk_super); 23120b86a832SChris Mason 23130b86a832SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 23140b86a832SChris Mason chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); 23150b86a832SChris Mason 23160b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 23170b86a832SChris Mason btrfs_super_chunk_root(disk_super), 231884234f3aSYan Zheng blocksize, generation); 231979787eaaSJeff Mahoney BUG_ON(!chunk_root->node); /* -ENOMEM */ 232083121942SDavid Woodhouse if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { 232183121942SDavid Woodhouse printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", 232283121942SDavid Woodhouse sb->s_id); 2323af31f5e5SChris Mason goto fail_tree_roots; 232483121942SDavid Woodhouse } 23255d4f98a2SYan Zheng btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); 23265d4f98a2SYan Zheng chunk_root->commit_root = btrfs_root_node(chunk_root); 23270b86a832SChris Mason 2328e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 2329e17cade2SChris Mason (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), 2330e17cade2SChris Mason BTRFS_UUID_SIZE); 2331e17cade2SChris Mason 23320b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 23332b82032cSYan Zheng if (ret) { 2334d397712bSChris Mason printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n", 2335d397712bSChris Mason sb->s_id); 2336af31f5e5SChris Mason goto fail_tree_roots; 23372b82032cSYan Zheng } 23380b86a832SChris Mason 2339dfe25020SChris Mason btrfs_close_extra_devices(fs_devices); 2340dfe25020SChris Mason 2341a6b0d5c8SChris Mason if (!fs_devices->latest_bdev) { 2342a6b0d5c8SChris Mason printk(KERN_CRIT "btrfs: failed to read devices on %s\n", 2343a6b0d5c8SChris Mason sb->s_id); 2344a6b0d5c8SChris Mason goto fail_tree_roots; 2345a6b0d5c8SChris Mason } 2346a6b0d5c8SChris Mason 2347af31f5e5SChris Mason retry_root_backup: 2348db94535dSChris Mason blocksize = btrfs_level_size(tree_root, 2349db94535dSChris Mason btrfs_super_root_level(disk_super)); 235084234f3aSYan Zheng generation = btrfs_super_generation(disk_super); 23510b86a832SChris Mason 2352e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 2353db94535dSChris Mason btrfs_super_root(disk_super), 235484234f3aSYan Zheng blocksize, generation); 2355af31f5e5SChris Mason if (!tree_root->node || 2356af31f5e5SChris Mason !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { 235783121942SDavid Woodhouse printk(KERN_WARNING "btrfs: failed to read tree root on %s\n", 235883121942SDavid Woodhouse sb->s_id); 2359af31f5e5SChris Mason 2360af31f5e5SChris Mason goto recovery_tree_root; 236183121942SDavid Woodhouse } 2362af31f5e5SChris Mason 23635d4f98a2SYan Zheng btrfs_set_root_node(&tree_root->root_item, tree_root->node); 23645d4f98a2SYan Zheng tree_root->commit_root = btrfs_root_node(tree_root); 2365db94535dSChris Mason 2366db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 2367e20d96d6SChris Mason BTRFS_EXTENT_TREE_OBJECTID, extent_root); 23680b86a832SChris Mason if (ret) 2369af31f5e5SChris Mason goto recovery_tree_root; 23700b86a832SChris Mason extent_root->track_dirty = 1; 23710b86a832SChris Mason 23720b86a832SChris Mason ret = find_and_setup_root(tree_root, fs_info, 23730b86a832SChris Mason BTRFS_DEV_TREE_OBJECTID, dev_root); 23740b86a832SChris Mason if (ret) 2375af31f5e5SChris Mason goto recovery_tree_root; 23765d4f98a2SYan Zheng dev_root->track_dirty = 1; 23773768f368SChris Mason 2378d20f7043SChris Mason ret = find_and_setup_root(tree_root, fs_info, 2379d20f7043SChris Mason BTRFS_CSUM_TREE_OBJECTID, csum_root); 2380d20f7043SChris Mason if (ret) 2381af31f5e5SChris Mason goto recovery_tree_root; 2382d20f7043SChris Mason 2383d20f7043SChris Mason csum_root->track_dirty = 1; 2384d20f7043SChris Mason 23858929ecfaSYan, Zheng fs_info->generation = generation; 23868929ecfaSYan, Zheng fs_info->last_trans_committed = generation; 23878929ecfaSYan, Zheng 2388c59021f8Sliubo ret = btrfs_init_space_info(fs_info); 2389c59021f8Sliubo if (ret) { 2390c59021f8Sliubo printk(KERN_ERR "Failed to initial space info: %d\n", ret); 2391c59021f8Sliubo goto fail_block_groups; 2392c59021f8Sliubo } 2393c59021f8Sliubo 23941b1d1f66SJosef Bacik ret = btrfs_read_block_groups(extent_root); 23951b1d1f66SJosef Bacik if (ret) { 23961b1d1f66SJosef Bacik printk(KERN_ERR "Failed to read block groups: %d\n", ret); 23971b1d1f66SJosef Bacik goto fail_block_groups; 23981b1d1f66SJosef Bacik } 23999078a3e1SChris Mason 2400a74a4b97SChris Mason fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, 2401a74a4b97SChris Mason "btrfs-cleaner"); 240257506d50SQinghuang Feng if (IS_ERR(fs_info->cleaner_kthread)) 24031b1d1f66SJosef Bacik goto fail_block_groups; 2404a74a4b97SChris Mason 2405a74a4b97SChris Mason fs_info->transaction_kthread = kthread_run(transaction_kthread, 2406a74a4b97SChris Mason tree_root, 2407a74a4b97SChris Mason "btrfs-transaction"); 240857506d50SQinghuang Feng if (IS_ERR(fs_info->transaction_kthread)) 24093f157a2fSChris Mason goto fail_cleaner; 2410a74a4b97SChris Mason 2411c289811cSChris Mason if (!btrfs_test_opt(tree_root, SSD) && 2412c289811cSChris Mason !btrfs_test_opt(tree_root, NOSSD) && 2413c289811cSChris Mason !fs_info->fs_devices->rotating) { 2414c289811cSChris Mason printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD " 2415c289811cSChris Mason "mode\n"); 2416c289811cSChris Mason btrfs_set_opt(fs_info->mount_opt, SSD); 2417c289811cSChris Mason } 2418c289811cSChris Mason 241921adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 242021adbd5cSStefan Behrens if (btrfs_test_opt(tree_root, CHECK_INTEGRITY)) { 242121adbd5cSStefan Behrens ret = btrfsic_mount(tree_root, fs_devices, 242221adbd5cSStefan Behrens btrfs_test_opt(tree_root, 242321adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ? 242421adbd5cSStefan Behrens 1 : 0, 242521adbd5cSStefan Behrens fs_info->check_integrity_print_mask); 242621adbd5cSStefan Behrens if (ret) 242721adbd5cSStefan Behrens printk(KERN_WARNING "btrfs: failed to initialize" 242821adbd5cSStefan Behrens " integrity check module %s\n", sb->s_id); 242921adbd5cSStefan Behrens } 243021adbd5cSStefan Behrens #endif 243121adbd5cSStefan Behrens 2432acce952bSliubo /* do not make disk changes in broken FS */ 2433acce952bSliubo if (btrfs_super_log_root(disk_super) != 0 && 2434acce952bSliubo !(fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)) { 2435e02119d5SChris Mason u64 bytenr = btrfs_super_log_root(disk_super); 2436d18a2c44SChris Mason 24377c2ca468SChris Mason if (fs_devices->rw_devices == 0) { 2438d397712bSChris Mason printk(KERN_WARNING "Btrfs log replay required " 2439d397712bSChris Mason "on RO media\n"); 24407c2ca468SChris Mason err = -EIO; 24417c2ca468SChris Mason goto fail_trans_kthread; 24427c2ca468SChris Mason } 2443e02119d5SChris Mason blocksize = 2444e02119d5SChris Mason btrfs_level_size(tree_root, 2445e02119d5SChris Mason btrfs_super_log_root_level(disk_super)); 2446e02119d5SChris Mason 24476f07e42eSAl Viro log_tree_root = btrfs_alloc_root(fs_info); 2448676e4c86SDan Carpenter if (!log_tree_root) { 2449676e4c86SDan Carpenter err = -ENOMEM; 2450676e4c86SDan Carpenter goto fail_trans_kthread; 2451676e4c86SDan Carpenter } 2452e02119d5SChris Mason 2453e02119d5SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 2454e02119d5SChris Mason log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); 2455e02119d5SChris Mason 2456e02119d5SChris Mason log_tree_root->node = read_tree_block(tree_root, bytenr, 245784234f3aSYan Zheng blocksize, 245884234f3aSYan Zheng generation + 1); 245979787eaaSJeff Mahoney /* returns with log_tree_root freed on success */ 2460e02119d5SChris Mason ret = btrfs_recover_log_trees(log_tree_root); 246179787eaaSJeff Mahoney if (ret) { 246279787eaaSJeff Mahoney btrfs_error(tree_root->fs_info, ret, 246379787eaaSJeff Mahoney "Failed to recover log tree"); 246479787eaaSJeff Mahoney free_extent_buffer(log_tree_root->node); 246579787eaaSJeff Mahoney kfree(log_tree_root); 246679787eaaSJeff Mahoney goto fail_trans_kthread; 246779787eaaSJeff Mahoney } 2468e556ce2cSYan Zheng 2469e556ce2cSYan Zheng if (sb->s_flags & MS_RDONLY) { 2470e556ce2cSYan Zheng ret = btrfs_commit_super(tree_root); 247179787eaaSJeff Mahoney if (ret) 247279787eaaSJeff Mahoney goto fail_trans_kthread; 2473e556ce2cSYan Zheng } 2474e02119d5SChris Mason } 24751a40e23bSZheng Yan 247676dda93cSYan, Zheng ret = btrfs_find_orphan_roots(tree_root); 247779787eaaSJeff Mahoney if (ret) 247879787eaaSJeff Mahoney goto fail_trans_kthread; 247976dda93cSYan, Zheng 24807c2ca468SChris Mason if (!(sb->s_flags & MS_RDONLY)) { 2481d68fc57bSYan, Zheng ret = btrfs_cleanup_fs_roots(fs_info); 248279787eaaSJeff Mahoney if (ret) { 248379787eaaSJeff Mahoney } 2484d68fc57bSYan, Zheng 24855d4f98a2SYan Zheng ret = btrfs_recover_relocation(tree_root); 2486d7ce5843SMiao Xie if (ret < 0) { 2487d7ce5843SMiao Xie printk(KERN_WARNING 2488d7ce5843SMiao Xie "btrfs: failed to recover relocation\n"); 2489d7ce5843SMiao Xie err = -EINVAL; 2490d7ce5843SMiao Xie goto fail_trans_kthread; 2491d7ce5843SMiao Xie } 24927c2ca468SChris Mason } 24931a40e23bSZheng Yan 24943de4586cSChris Mason location.objectid = BTRFS_FS_TREE_OBJECTID; 24953de4586cSChris Mason location.type = BTRFS_ROOT_ITEM_KEY; 24963de4586cSChris Mason location.offset = (u64)-1; 24973de4586cSChris Mason 24983de4586cSChris Mason fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); 24993de4586cSChris Mason if (!fs_info->fs_root) 25007c2ca468SChris Mason goto fail_trans_kthread; 25013140c9a3SDan Carpenter if (IS_ERR(fs_info->fs_root)) { 25023140c9a3SDan Carpenter err = PTR_ERR(fs_info->fs_root); 25033140c9a3SDan Carpenter goto fail_trans_kthread; 25043140c9a3SDan Carpenter } 2505c289811cSChris Mason 2506e3acc2a6SJosef Bacik if (!(sb->s_flags & MS_RDONLY)) { 2507e3acc2a6SJosef Bacik down_read(&fs_info->cleanup_work_sem); 250866b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_info->fs_root); 250966b4ffd1SJosef Bacik if (!err) 251066b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_info->tree_root); 2511e3acc2a6SJosef Bacik up_read(&fs_info->cleanup_work_sem); 251259641015SIlya Dryomov 251359641015SIlya Dryomov if (!err) 251459641015SIlya Dryomov err = btrfs_recover_balance(fs_info->tree_root); 251559641015SIlya Dryomov 251666b4ffd1SJosef Bacik if (err) { 251766b4ffd1SJosef Bacik close_ctree(tree_root); 2518ad2b2c80SAl Viro return err; 251966b4ffd1SJosef Bacik } 2520e3acc2a6SJosef Bacik } 2521e3acc2a6SJosef Bacik 2522ad2b2c80SAl Viro return 0; 252339279cc3SChris Mason 25247c2ca468SChris Mason fail_trans_kthread: 25257c2ca468SChris Mason kthread_stop(fs_info->transaction_kthread); 25263f157a2fSChris Mason fail_cleaner: 2527a74a4b97SChris Mason kthread_stop(fs_info->cleaner_kthread); 25287c2ca468SChris Mason 25297c2ca468SChris Mason /* 25307c2ca468SChris Mason * make sure we're done with the btree inode before we stop our 25317c2ca468SChris Mason * kthreads 25327c2ca468SChris Mason */ 25337c2ca468SChris Mason filemap_write_and_wait(fs_info->btree_inode->i_mapping); 25347c2ca468SChris Mason invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 25357c2ca468SChris Mason 25361b1d1f66SJosef Bacik fail_block_groups: 25371b1d1f66SJosef Bacik btrfs_free_block_groups(fs_info); 2538af31f5e5SChris Mason 2539af31f5e5SChris Mason fail_tree_roots: 2540af31f5e5SChris Mason free_root_pointers(fs_info, 1); 2541af31f5e5SChris Mason 254239279cc3SChris Mason fail_sb_buffer: 254361d92c32SChris Mason btrfs_stop_workers(&fs_info->generic_worker); 2544306c8b68SChris Mason btrfs_stop_workers(&fs_info->readahead_workers); 2545247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 2546771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 25478b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 25488b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 2549d20f7043SChris Mason btrfs_stop_workers(&fs_info->endio_meta_workers); 2550cad321adSChris Mason btrfs_stop_workers(&fs_info->endio_meta_write_workers); 2551e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 25520cb59c99SJosef Bacik btrfs_stop_workers(&fs_info->endio_freespace_worker); 25531cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 255416cdcec7SMiao Xie btrfs_stop_workers(&fs_info->delayed_workers); 2555bab39bf9SJosef Bacik btrfs_stop_workers(&fs_info->caching_workers); 255616cdcec7SMiao Xie fail_alloc: 25574543df7eSChris Mason fail_iput: 2558586e46e2SIlya Dryomov btrfs_mapping_tree_free(&fs_info->mapping_tree); 2559586e46e2SIlya Dryomov 25607c2ca468SChris Mason invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 25614543df7eSChris Mason iput(fs_info->btree_inode); 2562ad081f14SJens Axboe fail_bdi: 25637e662854SQinghuang Feng bdi_destroy(&fs_info->bdi); 256476dda93cSYan, Zheng fail_srcu: 256576dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 25667e662854SQinghuang Feng fail: 2567586e46e2SIlya Dryomov btrfs_close_devices(fs_info->fs_devices); 2568ad2b2c80SAl Viro return err; 2569af31f5e5SChris Mason 2570af31f5e5SChris Mason recovery_tree_root: 2571af31f5e5SChris Mason if (!btrfs_test_opt(tree_root, RECOVERY)) 2572af31f5e5SChris Mason goto fail_tree_roots; 2573af31f5e5SChris Mason 2574af31f5e5SChris Mason free_root_pointers(fs_info, 0); 2575af31f5e5SChris Mason 2576af31f5e5SChris Mason /* don't use the log in recovery mode, it won't be valid */ 2577af31f5e5SChris Mason btrfs_set_super_log_root(disk_super, 0); 2578af31f5e5SChris Mason 2579af31f5e5SChris Mason /* we can't trust the free space cache either */ 2580af31f5e5SChris Mason btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE); 2581af31f5e5SChris Mason 2582af31f5e5SChris Mason ret = next_root_backup(fs_info, fs_info->super_copy, 2583af31f5e5SChris Mason &num_backups_tried, &backup_index); 2584af31f5e5SChris Mason if (ret == -1) 2585af31f5e5SChris Mason goto fail_block_groups; 2586af31f5e5SChris Mason goto retry_root_backup; 2587eb60ceacSChris Mason } 2588eb60ceacSChris Mason 2589f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 2590f2984462SChris Mason { 2591f2984462SChris Mason char b[BDEVNAME_SIZE]; 2592f2984462SChris Mason 2593f2984462SChris Mason if (uptodate) { 2594f2984462SChris Mason set_buffer_uptodate(bh); 2595f2984462SChris Mason } else { 25967a36ddecSDavid Sterba printk_ratelimited(KERN_WARNING "lost page write due to " 2597f2984462SChris Mason "I/O error on %s\n", 2598f2984462SChris Mason bdevname(bh->b_bdev, b)); 25991259ab75SChris Mason /* note, we dont' set_buffer_write_io_error because we have 26001259ab75SChris Mason * our own ways of dealing with the IO errors 26011259ab75SChris Mason */ 2602f2984462SChris Mason clear_buffer_uptodate(bh); 2603f2984462SChris Mason } 2604f2984462SChris Mason unlock_buffer(bh); 2605f2984462SChris Mason put_bh(bh); 2606f2984462SChris Mason } 2607f2984462SChris Mason 2608a512bbf8SYan Zheng struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) 2609a512bbf8SYan Zheng { 2610a512bbf8SYan Zheng struct buffer_head *bh; 2611a512bbf8SYan Zheng struct buffer_head *latest = NULL; 2612a512bbf8SYan Zheng struct btrfs_super_block *super; 2613a512bbf8SYan Zheng int i; 2614a512bbf8SYan Zheng u64 transid = 0; 2615a512bbf8SYan Zheng u64 bytenr; 2616a512bbf8SYan Zheng 2617a512bbf8SYan Zheng /* we would like to check all the supers, but that would make 2618a512bbf8SYan Zheng * a btrfs mount succeed after a mkfs from a different FS. 2619a512bbf8SYan Zheng * So, we need to add a special mount option to scan for 2620a512bbf8SYan Zheng * later supers, using BTRFS_SUPER_MIRROR_MAX instead 2621a512bbf8SYan Zheng */ 2622a512bbf8SYan Zheng for (i = 0; i < 1; i++) { 2623a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2624a512bbf8SYan Zheng if (bytenr + 4096 >= i_size_read(bdev->bd_inode)) 2625a512bbf8SYan Zheng break; 2626a512bbf8SYan Zheng bh = __bread(bdev, bytenr / 4096, 4096); 2627a512bbf8SYan Zheng if (!bh) 2628a512bbf8SYan Zheng continue; 2629a512bbf8SYan Zheng 2630a512bbf8SYan Zheng super = (struct btrfs_super_block *)bh->b_data; 2631a512bbf8SYan Zheng if (btrfs_super_bytenr(super) != bytenr || 2632a512bbf8SYan Zheng strncmp((char *)(&super->magic), BTRFS_MAGIC, 2633a512bbf8SYan Zheng sizeof(super->magic))) { 2634a512bbf8SYan Zheng brelse(bh); 2635a512bbf8SYan Zheng continue; 2636a512bbf8SYan Zheng } 2637a512bbf8SYan Zheng 2638a512bbf8SYan Zheng if (!latest || btrfs_super_generation(super) > transid) { 2639a512bbf8SYan Zheng brelse(latest); 2640a512bbf8SYan Zheng latest = bh; 2641a512bbf8SYan Zheng transid = btrfs_super_generation(super); 2642a512bbf8SYan Zheng } else { 2643a512bbf8SYan Zheng brelse(bh); 2644a512bbf8SYan Zheng } 2645a512bbf8SYan Zheng } 2646a512bbf8SYan Zheng return latest; 2647a512bbf8SYan Zheng } 2648a512bbf8SYan Zheng 26494eedeb75SHisashi Hifumi /* 26504eedeb75SHisashi Hifumi * this should be called twice, once with wait == 0 and 26514eedeb75SHisashi Hifumi * once with wait == 1. When wait == 0 is done, all the buffer heads 26524eedeb75SHisashi Hifumi * we write are pinned. 26534eedeb75SHisashi Hifumi * 26544eedeb75SHisashi Hifumi * They are released when wait == 1 is done. 26554eedeb75SHisashi Hifumi * max_mirrors must be the same for both runs, and it indicates how 26564eedeb75SHisashi Hifumi * many supers on this one device should be written. 26574eedeb75SHisashi Hifumi * 26584eedeb75SHisashi Hifumi * max_mirrors == 0 means to write them all. 26594eedeb75SHisashi Hifumi */ 2660a512bbf8SYan Zheng static int write_dev_supers(struct btrfs_device *device, 2661a512bbf8SYan Zheng struct btrfs_super_block *sb, 2662a512bbf8SYan Zheng int do_barriers, int wait, int max_mirrors) 2663a512bbf8SYan Zheng { 2664a512bbf8SYan Zheng struct buffer_head *bh; 2665a512bbf8SYan Zheng int i; 2666a512bbf8SYan Zheng int ret; 2667a512bbf8SYan Zheng int errors = 0; 2668a512bbf8SYan Zheng u32 crc; 2669a512bbf8SYan Zheng u64 bytenr; 2670a512bbf8SYan Zheng 2671a512bbf8SYan Zheng if (max_mirrors == 0) 2672a512bbf8SYan Zheng max_mirrors = BTRFS_SUPER_MIRROR_MAX; 2673a512bbf8SYan Zheng 2674a512bbf8SYan Zheng for (i = 0; i < max_mirrors; i++) { 2675a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2676a512bbf8SYan Zheng if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) 2677a512bbf8SYan Zheng break; 2678a512bbf8SYan Zheng 2679a512bbf8SYan Zheng if (wait) { 2680a512bbf8SYan Zheng bh = __find_get_block(device->bdev, bytenr / 4096, 2681a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 2682a512bbf8SYan Zheng BUG_ON(!bh); 2683a512bbf8SYan Zheng wait_on_buffer(bh); 26844eedeb75SHisashi Hifumi if (!buffer_uptodate(bh)) 26854eedeb75SHisashi Hifumi errors++; 26864eedeb75SHisashi Hifumi 26874eedeb75SHisashi Hifumi /* drop our reference */ 26884eedeb75SHisashi Hifumi brelse(bh); 26894eedeb75SHisashi Hifumi 26904eedeb75SHisashi Hifumi /* drop the reference from the wait == 0 run */ 2691a512bbf8SYan Zheng brelse(bh); 2692a512bbf8SYan Zheng continue; 2693a512bbf8SYan Zheng } else { 2694a512bbf8SYan Zheng btrfs_set_super_bytenr(sb, bytenr); 2695a512bbf8SYan Zheng 2696a512bbf8SYan Zheng crc = ~(u32)0; 2697a512bbf8SYan Zheng crc = btrfs_csum_data(NULL, (char *)sb + 2698a512bbf8SYan Zheng BTRFS_CSUM_SIZE, crc, 2699a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE - 2700a512bbf8SYan Zheng BTRFS_CSUM_SIZE); 2701a512bbf8SYan Zheng btrfs_csum_final(crc, sb->csum); 2702a512bbf8SYan Zheng 27034eedeb75SHisashi Hifumi /* 27044eedeb75SHisashi Hifumi * one reference for us, and we leave it for the 27054eedeb75SHisashi Hifumi * caller 27064eedeb75SHisashi Hifumi */ 2707a512bbf8SYan Zheng bh = __getblk(device->bdev, bytenr / 4096, 2708a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 2709a512bbf8SYan Zheng memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 2710a512bbf8SYan Zheng 27114eedeb75SHisashi Hifumi /* one reference for submit_bh */ 2712a512bbf8SYan Zheng get_bh(bh); 27134eedeb75SHisashi Hifumi 27144eedeb75SHisashi Hifumi set_buffer_uptodate(bh); 2715a512bbf8SYan Zheng lock_buffer(bh); 2716a512bbf8SYan Zheng bh->b_end_io = btrfs_end_buffer_write_sync; 2717a512bbf8SYan Zheng } 2718a512bbf8SYan Zheng 2719387125fcSChris Mason /* 2720387125fcSChris Mason * we fua the first super. The others we allow 2721387125fcSChris Mason * to go down lazy. 2722387125fcSChris Mason */ 272321adbd5cSStefan Behrens ret = btrfsic_submit_bh(WRITE_FUA, bh); 27244eedeb75SHisashi Hifumi if (ret) 2725a512bbf8SYan Zheng errors++; 2726a512bbf8SYan Zheng } 2727a512bbf8SYan Zheng return errors < i ? 0 : -1; 2728a512bbf8SYan Zheng } 2729a512bbf8SYan Zheng 2730387125fcSChris Mason /* 2731387125fcSChris Mason * endio for the write_dev_flush, this will wake anyone waiting 2732387125fcSChris Mason * for the barrier when it is done 2733387125fcSChris Mason */ 2734387125fcSChris Mason static void btrfs_end_empty_barrier(struct bio *bio, int err) 2735387125fcSChris Mason { 2736387125fcSChris Mason if (err) { 2737387125fcSChris Mason if (err == -EOPNOTSUPP) 2738387125fcSChris Mason set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); 2739387125fcSChris Mason clear_bit(BIO_UPTODATE, &bio->bi_flags); 2740387125fcSChris Mason } 2741387125fcSChris Mason if (bio->bi_private) 2742387125fcSChris Mason complete(bio->bi_private); 2743387125fcSChris Mason bio_put(bio); 2744387125fcSChris Mason } 2745387125fcSChris Mason 2746387125fcSChris Mason /* 2747387125fcSChris Mason * trigger flushes for one the devices. If you pass wait == 0, the flushes are 2748387125fcSChris Mason * sent down. With wait == 1, it waits for the previous flush. 2749387125fcSChris Mason * 2750387125fcSChris Mason * any device where the flush fails with eopnotsupp are flagged as not-barrier 2751387125fcSChris Mason * capable 2752387125fcSChris Mason */ 2753387125fcSChris Mason static int write_dev_flush(struct btrfs_device *device, int wait) 2754387125fcSChris Mason { 2755387125fcSChris Mason struct bio *bio; 2756387125fcSChris Mason int ret = 0; 2757387125fcSChris Mason 2758387125fcSChris Mason if (device->nobarriers) 2759387125fcSChris Mason return 0; 2760387125fcSChris Mason 2761387125fcSChris Mason if (wait) { 2762387125fcSChris Mason bio = device->flush_bio; 2763387125fcSChris Mason if (!bio) 2764387125fcSChris Mason return 0; 2765387125fcSChris Mason 2766387125fcSChris Mason wait_for_completion(&device->flush_wait); 2767387125fcSChris Mason 2768387125fcSChris Mason if (bio_flagged(bio, BIO_EOPNOTSUPP)) { 2769387125fcSChris Mason printk("btrfs: disabling barriers on dev %s\n", 2770387125fcSChris Mason device->name); 2771387125fcSChris Mason device->nobarriers = 1; 2772387125fcSChris Mason } 2773387125fcSChris Mason if (!bio_flagged(bio, BIO_UPTODATE)) { 2774387125fcSChris Mason ret = -EIO; 2775387125fcSChris Mason } 2776387125fcSChris Mason 2777387125fcSChris Mason /* drop the reference from the wait == 0 run */ 2778387125fcSChris Mason bio_put(bio); 2779387125fcSChris Mason device->flush_bio = NULL; 2780387125fcSChris Mason 2781387125fcSChris Mason return ret; 2782387125fcSChris Mason } 2783387125fcSChris Mason 2784387125fcSChris Mason /* 2785387125fcSChris Mason * one reference for us, and we leave it for the 2786387125fcSChris Mason * caller 2787387125fcSChris Mason */ 2788387125fcSChris Mason device->flush_bio = NULL;; 2789387125fcSChris Mason bio = bio_alloc(GFP_NOFS, 0); 2790387125fcSChris Mason if (!bio) 2791387125fcSChris Mason return -ENOMEM; 2792387125fcSChris Mason 2793387125fcSChris Mason bio->bi_end_io = btrfs_end_empty_barrier; 2794387125fcSChris Mason bio->bi_bdev = device->bdev; 2795387125fcSChris Mason init_completion(&device->flush_wait); 2796387125fcSChris Mason bio->bi_private = &device->flush_wait; 2797387125fcSChris Mason device->flush_bio = bio; 2798387125fcSChris Mason 2799387125fcSChris Mason bio_get(bio); 280021adbd5cSStefan Behrens btrfsic_submit_bio(WRITE_FLUSH, bio); 2801387125fcSChris Mason 2802387125fcSChris Mason return 0; 2803387125fcSChris Mason } 2804387125fcSChris Mason 2805387125fcSChris Mason /* 2806387125fcSChris Mason * send an empty flush down to each device in parallel, 2807387125fcSChris Mason * then wait for them 2808387125fcSChris Mason */ 2809387125fcSChris Mason static int barrier_all_devices(struct btrfs_fs_info *info) 2810387125fcSChris Mason { 2811387125fcSChris Mason struct list_head *head; 2812387125fcSChris Mason struct btrfs_device *dev; 2813387125fcSChris Mason int errors = 0; 2814387125fcSChris Mason int ret; 2815387125fcSChris Mason 2816387125fcSChris Mason /* send down all the barriers */ 2817387125fcSChris Mason head = &info->fs_devices->devices; 2818387125fcSChris Mason list_for_each_entry_rcu(dev, head, dev_list) { 2819387125fcSChris Mason if (!dev->bdev) { 2820387125fcSChris Mason errors++; 2821387125fcSChris Mason continue; 2822387125fcSChris Mason } 2823387125fcSChris Mason if (!dev->in_fs_metadata || !dev->writeable) 2824387125fcSChris Mason continue; 2825387125fcSChris Mason 2826387125fcSChris Mason ret = write_dev_flush(dev, 0); 2827387125fcSChris Mason if (ret) 2828387125fcSChris Mason errors++; 2829387125fcSChris Mason } 2830387125fcSChris Mason 2831387125fcSChris Mason /* wait for all the barriers */ 2832387125fcSChris Mason list_for_each_entry_rcu(dev, head, dev_list) { 2833387125fcSChris Mason if (!dev->bdev) { 2834387125fcSChris Mason errors++; 2835387125fcSChris Mason continue; 2836387125fcSChris Mason } 2837387125fcSChris Mason if (!dev->in_fs_metadata || !dev->writeable) 2838387125fcSChris Mason continue; 2839387125fcSChris Mason 2840387125fcSChris Mason ret = write_dev_flush(dev, 1); 2841387125fcSChris Mason if (ret) 2842387125fcSChris Mason errors++; 2843387125fcSChris Mason } 2844387125fcSChris Mason if (errors) 2845387125fcSChris Mason return -EIO; 2846387125fcSChris Mason return 0; 2847387125fcSChris Mason } 2848387125fcSChris Mason 2849a512bbf8SYan Zheng int write_all_supers(struct btrfs_root *root, int max_mirrors) 2850f2984462SChris Mason { 2851e5e9a520SChris Mason struct list_head *head; 2852f2984462SChris Mason struct btrfs_device *dev; 2853a061fc8dSChris Mason struct btrfs_super_block *sb; 2854f2984462SChris Mason struct btrfs_dev_item *dev_item; 2855f2984462SChris Mason int ret; 2856f2984462SChris Mason int do_barriers; 2857a236aed1SChris Mason int max_errors; 2858a236aed1SChris Mason int total_errors = 0; 2859a061fc8dSChris Mason u64 flags; 2860f2984462SChris Mason 28616c41761fSDavid Sterba max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1; 2862f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 2863af31f5e5SChris Mason backup_super_roots(root->fs_info); 2864f2984462SChris Mason 28656c41761fSDavid Sterba sb = root->fs_info->super_for_commit; 2866a061fc8dSChris Mason dev_item = &sb->dev_item; 2867e5e9a520SChris Mason 2868174ba509SChris Mason mutex_lock(&root->fs_info->fs_devices->device_list_mutex); 2869e5e9a520SChris Mason head = &root->fs_info->fs_devices->devices; 2870387125fcSChris Mason 2871387125fcSChris Mason if (do_barriers) 2872387125fcSChris Mason barrier_all_devices(root->fs_info); 2873387125fcSChris Mason 28741f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 2875dfe25020SChris Mason if (!dev->bdev) { 2876dfe25020SChris Mason total_errors++; 2877dfe25020SChris Mason continue; 2878dfe25020SChris Mason } 28792b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 2880dfe25020SChris Mason continue; 2881dfe25020SChris Mason 28822b82032cSYan Zheng btrfs_set_stack_device_generation(dev_item, 0); 2883a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 2884a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 2885a061fc8dSChris Mason btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); 2886a061fc8dSChris Mason btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); 2887a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 2888a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 2889a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 2890a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 28912b82032cSYan Zheng memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 2892a512bbf8SYan Zheng 2893a061fc8dSChris Mason flags = btrfs_super_flags(sb); 2894a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 2895f2984462SChris Mason 2896a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); 2897a236aed1SChris Mason if (ret) 2898a236aed1SChris Mason total_errors++; 2899f2984462SChris Mason } 2900a236aed1SChris Mason if (total_errors > max_errors) { 2901d397712bSChris Mason printk(KERN_ERR "btrfs: %d errors while writing supers\n", 2902d397712bSChris Mason total_errors); 290379787eaaSJeff Mahoney 290479787eaaSJeff Mahoney /* This shouldn't happen. FUA is masked off if unsupported */ 2905a236aed1SChris Mason BUG(); 2906a236aed1SChris Mason } 2907f2984462SChris Mason 2908a512bbf8SYan Zheng total_errors = 0; 29091f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 2910dfe25020SChris Mason if (!dev->bdev) 2911dfe25020SChris Mason continue; 29122b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 2913dfe25020SChris Mason continue; 2914dfe25020SChris Mason 2915a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); 2916a512bbf8SYan Zheng if (ret) 29171259ab75SChris Mason total_errors++; 2918f2984462SChris Mason } 2919174ba509SChris Mason mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); 2920a236aed1SChris Mason if (total_errors > max_errors) { 292179787eaaSJeff Mahoney btrfs_error(root->fs_info, -EIO, 292279787eaaSJeff Mahoney "%d errors while writing supers", total_errors); 292379787eaaSJeff Mahoney return -EIO; 2924a236aed1SChris Mason } 2925f2984462SChris Mason return 0; 2926f2984462SChris Mason } 2927f2984462SChris Mason 2928a512bbf8SYan Zheng int write_ctree_super(struct btrfs_trans_handle *trans, 2929a512bbf8SYan Zheng struct btrfs_root *root, int max_mirrors) 2930cfaa7295SChris Mason { 2931e66f709bSChris Mason int ret; 29322c90e5d6SChris Mason 2933a512bbf8SYan Zheng ret = write_all_supers(root, max_mirrors); 29345f39d397SChris Mason return ret; 2935cfaa7295SChris Mason } 2936cfaa7295SChris Mason 293749b25e05SJeff Mahoney /* Kill all outstanding I/O */ 293849b25e05SJeff Mahoney void btrfs_abort_devices(struct btrfs_root *root) 293949b25e05SJeff Mahoney { 294049b25e05SJeff Mahoney struct list_head *head; 294149b25e05SJeff Mahoney struct btrfs_device *dev; 294249b25e05SJeff Mahoney mutex_lock(&root->fs_info->fs_devices->device_list_mutex); 294349b25e05SJeff Mahoney head = &root->fs_info->fs_devices->devices; 294449b25e05SJeff Mahoney list_for_each_entry_rcu(dev, head, dev_list) { 294549b25e05SJeff Mahoney blk_abort_queue(dev->bdev->bd_disk->queue); 294649b25e05SJeff Mahoney } 294749b25e05SJeff Mahoney mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); 294849b25e05SJeff Mahoney } 294949b25e05SJeff Mahoney 2950143bede5SJeff Mahoney void btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) 29512619ba1fSChris Mason { 29524df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 29532619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 29542619ba1fSChris Mason (unsigned long)root->root_key.objectid); 29554df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 295676dda93cSYan, Zheng 295776dda93cSYan, Zheng if (btrfs_root_refs(&root->root_item) == 0) 295876dda93cSYan, Zheng synchronize_srcu(&fs_info->subvol_srcu); 295976dda93cSYan, Zheng 2960581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_pinned); 2961581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_ctl); 29624df27c4dSYan, Zheng free_fs_root(root); 29634df27c4dSYan, Zheng } 29644df27c4dSYan, Zheng 29654df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root) 29664df27c4dSYan, Zheng { 296782d5902dSLi Zefan iput(root->cache_inode); 29684df27c4dSYan, Zheng WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); 29690ee5dc67SAl Viro if (root->anon_dev) 29700ee5dc67SAl Viro free_anon_bdev(root->anon_dev); 29715f39d397SChris Mason free_extent_buffer(root->node); 29725f39d397SChris Mason free_extent_buffer(root->commit_root); 2973581bb050SLi Zefan kfree(root->free_ino_ctl); 2974581bb050SLi Zefan kfree(root->free_ino_pinned); 297558176a96SJosef Bacik kfree(root->name); 29762619ba1fSChris Mason kfree(root); 29772619ba1fSChris Mason } 29782619ba1fSChris Mason 2979143bede5SJeff Mahoney static void del_fs_roots(struct btrfs_fs_info *fs_info) 29800f7d52f4SChris Mason { 29810f7d52f4SChris Mason int ret; 29820f7d52f4SChris Mason struct btrfs_root *gang[8]; 29830f7d52f4SChris Mason int i; 29840f7d52f4SChris Mason 298576dda93cSYan, Zheng while (!list_empty(&fs_info->dead_roots)) { 298676dda93cSYan, Zheng gang[0] = list_entry(fs_info->dead_roots.next, 298776dda93cSYan, Zheng struct btrfs_root, root_list); 298876dda93cSYan, Zheng list_del(&gang[0]->root_list); 298976dda93cSYan, Zheng 299076dda93cSYan, Zheng if (gang[0]->in_radix) { 299176dda93cSYan, Zheng btrfs_free_fs_root(fs_info, gang[0]); 299276dda93cSYan, Zheng } else { 299376dda93cSYan, Zheng free_extent_buffer(gang[0]->node); 299476dda93cSYan, Zheng free_extent_buffer(gang[0]->commit_root); 299576dda93cSYan, Zheng kfree(gang[0]); 299676dda93cSYan, Zheng } 299776dda93cSYan, Zheng } 299876dda93cSYan, Zheng 29990f7d52f4SChris Mason while (1) { 30000f7d52f4SChris Mason ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 30010f7d52f4SChris Mason (void **)gang, 0, 30020f7d52f4SChris Mason ARRAY_SIZE(gang)); 30030f7d52f4SChris Mason if (!ret) 30040f7d52f4SChris Mason break; 30052619ba1fSChris Mason for (i = 0; i < ret; i++) 30065eda7b5eSChris Mason btrfs_free_fs_root(fs_info, gang[i]); 30070f7d52f4SChris Mason } 30080f7d52f4SChris Mason } 3009b4100d64SChris Mason 3010c146afadSYan Zheng int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) 3011c146afadSYan Zheng { 3012c146afadSYan Zheng u64 root_objectid = 0; 3013c146afadSYan Zheng struct btrfs_root *gang[8]; 3014c146afadSYan Zheng int i; 3015c146afadSYan Zheng int ret; 3016c146afadSYan Zheng 3017c146afadSYan Zheng while (1) { 3018c146afadSYan Zheng ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 3019c146afadSYan Zheng (void **)gang, root_objectid, 3020c146afadSYan Zheng ARRAY_SIZE(gang)); 3021c146afadSYan Zheng if (!ret) 3022c146afadSYan Zheng break; 30235d4f98a2SYan Zheng 30245d4f98a2SYan Zheng root_objectid = gang[ret - 1]->root_key.objectid + 1; 3025c146afadSYan Zheng for (i = 0; i < ret; i++) { 302666b4ffd1SJosef Bacik int err; 302766b4ffd1SJosef Bacik 3028c146afadSYan Zheng root_objectid = gang[i]->root_key.objectid; 302966b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(gang[i]); 303066b4ffd1SJosef Bacik if (err) 303166b4ffd1SJosef Bacik return err; 3032c146afadSYan Zheng } 3033c146afadSYan Zheng root_objectid++; 3034c146afadSYan Zheng } 3035c146afadSYan Zheng return 0; 3036c146afadSYan Zheng } 3037c146afadSYan Zheng 3038c146afadSYan Zheng int btrfs_commit_super(struct btrfs_root *root) 3039c146afadSYan Zheng { 3040c146afadSYan Zheng struct btrfs_trans_handle *trans; 3041c146afadSYan Zheng int ret; 3042c146afadSYan Zheng 3043c146afadSYan Zheng mutex_lock(&root->fs_info->cleaner_mutex); 304424bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 3045c146afadSYan Zheng btrfs_clean_old_snapshots(root); 3046c146afadSYan Zheng mutex_unlock(&root->fs_info->cleaner_mutex); 3047c71bf099SYan, Zheng 3048c71bf099SYan, Zheng /* wait until ongoing cleanup work done */ 3049c71bf099SYan, Zheng down_write(&root->fs_info->cleanup_work_sem); 3050c71bf099SYan, Zheng up_write(&root->fs_info->cleanup_work_sem); 3051c71bf099SYan, Zheng 30527a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 30533612b495STsutomu Itoh if (IS_ERR(trans)) 30543612b495STsutomu Itoh return PTR_ERR(trans); 3055c146afadSYan Zheng ret = btrfs_commit_transaction(trans, root); 305679787eaaSJeff Mahoney if (ret) 305779787eaaSJeff Mahoney return ret; 3058c146afadSYan Zheng /* run commit again to drop the original snapshot */ 30597a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 30603612b495STsutomu Itoh if (IS_ERR(trans)) 30613612b495STsutomu Itoh return PTR_ERR(trans); 306279787eaaSJeff Mahoney ret = btrfs_commit_transaction(trans, root); 306379787eaaSJeff Mahoney if (ret) 306479787eaaSJeff Mahoney return ret; 3065c146afadSYan Zheng ret = btrfs_write_and_wait_transaction(NULL, root); 306679787eaaSJeff Mahoney if (ret) { 306779787eaaSJeff Mahoney btrfs_error(root->fs_info, ret, 306879787eaaSJeff Mahoney "Failed to sync btree inode to disk."); 306979787eaaSJeff Mahoney return ret; 307079787eaaSJeff Mahoney } 3071c146afadSYan Zheng 3072a512bbf8SYan Zheng ret = write_ctree_super(NULL, root, 0); 3073c146afadSYan Zheng return ret; 3074c146afadSYan Zheng } 3075c146afadSYan Zheng 3076e20d96d6SChris Mason int close_ctree(struct btrfs_root *root) 3077eb60ceacSChris Mason { 30780f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 3079c146afadSYan Zheng int ret; 3080e089f05cSChris Mason 3081facda1e7SChris Mason fs_info->closing = 1; 3082a2135011SChris Mason smp_mb(); 3083a2135011SChris Mason 3084837d5b6eSIlya Dryomov /* pause restriper - we want to resume on mount */ 3085837d5b6eSIlya Dryomov btrfs_pause_balance(root->fs_info); 3086837d5b6eSIlya Dryomov 3087a2de733cSArne Jansen btrfs_scrub_cancel(root); 30884cb5300bSChris Mason 30894cb5300bSChris Mason /* wait for any defraggers to finish */ 30904cb5300bSChris Mason wait_event(fs_info->transaction_wait, 30914cb5300bSChris Mason (atomic_read(&fs_info->defrag_running) == 0)); 30924cb5300bSChris Mason 30934cb5300bSChris Mason /* clear out the rbtree of defraggable inodes */ 3094e3029d9fSAl Viro btrfs_run_defrag_inodes(fs_info); 30954cb5300bSChris Mason 3096acce952bSliubo /* 3097acce952bSliubo * Here come 2 situations when btrfs is broken to flip readonly: 3098acce952bSliubo * 3099acce952bSliubo * 1. when btrfs flips readonly somewhere else before 3100acce952bSliubo * btrfs_commit_super, sb->s_flags has MS_RDONLY flag, 3101acce952bSliubo * and btrfs will skip to write sb directly to keep 3102acce952bSliubo * ERROR state on disk. 3103acce952bSliubo * 3104acce952bSliubo * 2. when btrfs flips readonly just in btrfs_commit_super, 3105ae0e47f0SJustin P. Mattock * and in such case, btrfs cannot write sb via btrfs_commit_super, 3106acce952bSliubo * and since fs_state has been set BTRFS_SUPER_FLAG_ERROR flag, 3107acce952bSliubo * btrfs will cleanup all FS resources first and write sb then. 3108acce952bSliubo */ 3109c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 3110c146afadSYan Zheng ret = btrfs_commit_super(root); 3111d397712bSChris Mason if (ret) 3112d397712bSChris Mason printk(KERN_ERR "btrfs: commit super ret %d\n", ret); 3113c146afadSYan Zheng } 3114ed2ff2cbSChris Mason 3115acce952bSliubo if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 3116acce952bSliubo ret = btrfs_error_commit_super(root); 3117acce952bSliubo if (ret) 3118acce952bSliubo printk(KERN_ERR "btrfs: commit super ret %d\n", ret); 3119acce952bSliubo } 3120acce952bSliubo 3121300e4f8aSJosef Bacik btrfs_put_block_group_cache(fs_info); 3122300e4f8aSJosef Bacik 3123e3029d9fSAl Viro kthread_stop(fs_info->transaction_kthread); 3124e3029d9fSAl Viro kthread_stop(fs_info->cleaner_kthread); 31258929ecfaSYan, Zheng 3126f25784b3SYan Zheng fs_info->closing = 2; 3127f25784b3SYan Zheng smp_mb(); 3128f25784b3SYan Zheng 3129b0c68f8bSChris Mason if (fs_info->delalloc_bytes) { 3130d397712bSChris Mason printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n", 313121380931SJoel Becker (unsigned long long)fs_info->delalloc_bytes); 3132b0c68f8bSChris Mason } 313331153d81SYan Zheng if (fs_info->total_ref_cache_size) { 3134d397712bSChris Mason printk(KERN_INFO "btrfs: at umount reference cache size %llu\n", 3135d397712bSChris Mason (unsigned long long)fs_info->total_ref_cache_size); 313631153d81SYan Zheng } 313731153d81SYan Zheng 31385f39d397SChris Mason free_extent_buffer(fs_info->extent_root->node); 31395d4f98a2SYan Zheng free_extent_buffer(fs_info->extent_root->commit_root); 31405f39d397SChris Mason free_extent_buffer(fs_info->tree_root->node); 31415d4f98a2SYan Zheng free_extent_buffer(fs_info->tree_root->commit_root); 3142e3029d9fSAl Viro free_extent_buffer(fs_info->chunk_root->node); 3143e3029d9fSAl Viro free_extent_buffer(fs_info->chunk_root->commit_root); 3144e3029d9fSAl Viro free_extent_buffer(fs_info->dev_root->node); 3145e3029d9fSAl Viro free_extent_buffer(fs_info->dev_root->commit_root); 3146e3029d9fSAl Viro free_extent_buffer(fs_info->csum_root->node); 3147e3029d9fSAl Viro free_extent_buffer(fs_info->csum_root->commit_root); 3148d20f7043SChris Mason 3149e3029d9fSAl Viro btrfs_free_block_groups(fs_info); 3150c146afadSYan Zheng 31510f7d52f4SChris Mason del_fs_roots(fs_info); 3152d10c5f31SChris Mason 3153c146afadSYan Zheng iput(fs_info->btree_inode); 31549ad6b7bcSChris Mason 315561d92c32SChris Mason btrfs_stop_workers(&fs_info->generic_worker); 3156247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 3157771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 31588b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 31598b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 3160d20f7043SChris Mason btrfs_stop_workers(&fs_info->endio_meta_workers); 3161cad321adSChris Mason btrfs_stop_workers(&fs_info->endio_meta_write_workers); 3162e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 31630cb59c99SJosef Bacik btrfs_stop_workers(&fs_info->endio_freespace_worker); 31641cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 316516cdcec7SMiao Xie btrfs_stop_workers(&fs_info->delayed_workers); 3166bab39bf9SJosef Bacik btrfs_stop_workers(&fs_info->caching_workers); 316790519d66SArne Jansen btrfs_stop_workers(&fs_info->readahead_workers); 3168d6bfde87SChris Mason 316921adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 317021adbd5cSStefan Behrens if (btrfs_test_opt(root, CHECK_INTEGRITY)) 317121adbd5cSStefan Behrens btrfsic_unmount(root, fs_info->fs_devices); 317221adbd5cSStefan Behrens #endif 317321adbd5cSStefan Behrens 3174dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 31750b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 3176b248a415SChris Mason 317704160088SChris Mason bdi_destroy(&fs_info->bdi); 317876dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 31790b86a832SChris Mason 3180eb60ceacSChris Mason return 0; 3181eb60ceacSChris Mason } 3182eb60ceacSChris Mason 31831259ab75SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) 3184ccd467d6SChris Mason { 31851259ab75SChris Mason int ret; 3186810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 31871259ab75SChris Mason 31882ac55d41SJosef Bacik ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf, 31892ac55d41SJosef Bacik NULL); 31901259ab75SChris Mason if (!ret) 31911259ab75SChris Mason return ret; 31921259ab75SChris Mason 31931259ab75SChris Mason ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, 31941259ab75SChris Mason parent_transid); 31951259ab75SChris Mason return !ret; 31965f39d397SChris Mason } 31976702ed49SChris Mason 31985f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 31995f39d397SChris Mason { 3200810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 3201d1310b2eSChris Mason return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, 32025f39d397SChris Mason buf); 32035f39d397SChris Mason } 32045f39d397SChris Mason 32055f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 32065f39d397SChris Mason { 3207810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 32085f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 32095f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 3210b9473439SChris Mason int was_dirty; 3211b4ce94deSChris Mason 3212b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 3213ccd467d6SChris Mason if (transid != root->fs_info->generation) { 3214d397712bSChris Mason printk(KERN_CRIT "btrfs transid mismatch buffer %llu, " 3215d397712bSChris Mason "found %llu running %llu\n", 3216db94535dSChris Mason (unsigned long long)buf->start, 3217d397712bSChris Mason (unsigned long long)transid, 3218d397712bSChris Mason (unsigned long long)root->fs_info->generation); 3219ccd467d6SChris Mason WARN_ON(1); 3220ccd467d6SChris Mason } 3221b9473439SChris Mason was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 3222b9473439SChris Mason buf); 3223b9473439SChris Mason if (!was_dirty) { 3224b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 3225b9473439SChris Mason root->fs_info->dirty_metadata_bytes += buf->len; 3226b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 3227b9473439SChris Mason } 3228eb60ceacSChris Mason } 3229eb60ceacSChris Mason 3230d3c2fdcfSChris Mason void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 323135b7e476SChris Mason { 3232188de649SChris Mason /* 3233188de649SChris Mason * looks as though older kernels can get into trouble with 3234188de649SChris Mason * this code, they end up stuck in balance_dirty_pages forever 3235188de649SChris Mason */ 3236d6bfde87SChris Mason u64 num_dirty; 3237771ed689SChris Mason unsigned long thresh = 32 * 1024 * 1024; 3238d6bfde87SChris Mason 32396933c02eSJens Axboe if (current->flags & PF_MEMALLOC) 3240d6bfde87SChris Mason return; 3241d6bfde87SChris Mason 324216cdcec7SMiao Xie btrfs_balance_delayed_items(root); 324316cdcec7SMiao Xie 324416cdcec7SMiao Xie num_dirty = root->fs_info->dirty_metadata_bytes; 324516cdcec7SMiao Xie 324616cdcec7SMiao Xie if (num_dirty > thresh) { 324716cdcec7SMiao Xie balance_dirty_pages_ratelimited_nr( 324816cdcec7SMiao Xie root->fs_info->btree_inode->i_mapping, 1); 324916cdcec7SMiao Xie } 325016cdcec7SMiao Xie return; 325116cdcec7SMiao Xie } 325216cdcec7SMiao Xie 325316cdcec7SMiao Xie void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 325416cdcec7SMiao Xie { 325516cdcec7SMiao Xie /* 325616cdcec7SMiao Xie * looks as though older kernels can get into trouble with 325716cdcec7SMiao Xie * this code, they end up stuck in balance_dirty_pages forever 325816cdcec7SMiao Xie */ 325916cdcec7SMiao Xie u64 num_dirty; 326016cdcec7SMiao Xie unsigned long thresh = 32 * 1024 * 1024; 326116cdcec7SMiao Xie 326216cdcec7SMiao Xie if (current->flags & PF_MEMALLOC) 326316cdcec7SMiao Xie return; 326416cdcec7SMiao Xie 3265585ad2c3SChris Mason num_dirty = root->fs_info->dirty_metadata_bytes; 3266585ad2c3SChris Mason 3267d6bfde87SChris Mason if (num_dirty > thresh) { 3268d3c2fdcfSChris Mason balance_dirty_pages_ratelimited_nr( 3269304fced6SChris Mason root->fs_info->btree_inode->i_mapping, 1); 327035b7e476SChris Mason } 3271188de649SChris Mason return; 3272d6bfde87SChris Mason } 32736b80053dSChris Mason 3274ca7a79adSChris Mason int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 32756b80053dSChris Mason { 3276810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 3277ce9adaa5SChris Mason int ret; 3278ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 3279d397712bSChris Mason if (ret == 0) 3280b4ce94deSChris Mason set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); 3281ce9adaa5SChris Mason return ret; 32826b80053dSChris Mason } 32830da5468fSChris Mason 328401d658f2SChris Mason static int btree_lock_page_hook(struct page *page, void *data, 328501d658f2SChris Mason void (*flush_fn)(void *)) 32864bef0848SChris Mason { 32874bef0848SChris Mason struct inode *inode = page->mapping->host; 3288b9473439SChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 32894bef0848SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 32904bef0848SChris Mason struct extent_buffer *eb; 32914bef0848SChris Mason unsigned long len; 32924bef0848SChris Mason u64 bytenr = page_offset(page); 32934bef0848SChris Mason 32944bef0848SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 32954bef0848SChris Mason goto out; 32964bef0848SChris Mason 32974bef0848SChris Mason len = page->private >> 2; 3298f09d1f60SDavid Sterba eb = find_extent_buffer(io_tree, bytenr, len); 32994bef0848SChris Mason if (!eb) 33004bef0848SChris Mason goto out; 33014bef0848SChris Mason 330201d658f2SChris Mason if (!btrfs_try_tree_write_lock(eb)) { 330301d658f2SChris Mason flush_fn(data); 33044bef0848SChris Mason btrfs_tree_lock(eb); 330501d658f2SChris Mason } 33064bef0848SChris Mason btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); 3307b9473439SChris Mason 3308b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { 3309b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 3310b9473439SChris Mason if (root->fs_info->dirty_metadata_bytes >= eb->len) 3311b9473439SChris Mason root->fs_info->dirty_metadata_bytes -= eb->len; 3312b9473439SChris Mason else 3313b9473439SChris Mason WARN_ON(1); 3314b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 3315b9473439SChris Mason } 3316b9473439SChris Mason 33174bef0848SChris Mason btrfs_tree_unlock(eb); 33184bef0848SChris Mason free_extent_buffer(eb); 33194bef0848SChris Mason out: 332001d658f2SChris Mason if (!trylock_page(page)) { 332101d658f2SChris Mason flush_fn(data); 33224bef0848SChris Mason lock_page(page); 332301d658f2SChris Mason } 33244bef0848SChris Mason return 0; 33254bef0848SChris Mason } 33264bef0848SChris Mason 3327acce952bSliubo static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info, 3328acce952bSliubo int read_only) 3329acce952bSliubo { 3330acce952bSliubo if (read_only) 3331acce952bSliubo return; 3332acce952bSliubo 3333acce952bSliubo if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) 3334acce952bSliubo printk(KERN_WARNING "warning: mount fs with errors, " 3335acce952bSliubo "running btrfsck is recommended\n"); 3336acce952bSliubo } 3337acce952bSliubo 3338acce952bSliubo int btrfs_error_commit_super(struct btrfs_root *root) 3339acce952bSliubo { 3340acce952bSliubo int ret; 3341acce952bSliubo 3342acce952bSliubo mutex_lock(&root->fs_info->cleaner_mutex); 3343acce952bSliubo btrfs_run_delayed_iputs(root); 3344acce952bSliubo mutex_unlock(&root->fs_info->cleaner_mutex); 3345acce952bSliubo 3346acce952bSliubo down_write(&root->fs_info->cleanup_work_sem); 3347acce952bSliubo up_write(&root->fs_info->cleanup_work_sem); 3348acce952bSliubo 3349acce952bSliubo /* cleanup FS via transaction */ 3350acce952bSliubo btrfs_cleanup_transaction(root); 3351acce952bSliubo 3352acce952bSliubo ret = write_ctree_super(NULL, root, 0); 3353acce952bSliubo 3354acce952bSliubo return ret; 3355acce952bSliubo } 3356acce952bSliubo 3357143bede5SJeff Mahoney static void btrfs_destroy_ordered_operations(struct btrfs_root *root) 3358acce952bSliubo { 3359acce952bSliubo struct btrfs_inode *btrfs_inode; 3360acce952bSliubo struct list_head splice; 3361acce952bSliubo 3362acce952bSliubo INIT_LIST_HEAD(&splice); 3363acce952bSliubo 3364acce952bSliubo mutex_lock(&root->fs_info->ordered_operations_mutex); 3365acce952bSliubo spin_lock(&root->fs_info->ordered_extent_lock); 3366acce952bSliubo 3367acce952bSliubo list_splice_init(&root->fs_info->ordered_operations, &splice); 3368acce952bSliubo while (!list_empty(&splice)) { 3369acce952bSliubo btrfs_inode = list_entry(splice.next, struct btrfs_inode, 3370acce952bSliubo ordered_operations); 3371acce952bSliubo 3372acce952bSliubo list_del_init(&btrfs_inode->ordered_operations); 3373acce952bSliubo 3374acce952bSliubo btrfs_invalidate_inodes(btrfs_inode->root); 3375acce952bSliubo } 3376acce952bSliubo 3377acce952bSliubo spin_unlock(&root->fs_info->ordered_extent_lock); 3378acce952bSliubo mutex_unlock(&root->fs_info->ordered_operations_mutex); 3379acce952bSliubo } 3380acce952bSliubo 3381143bede5SJeff Mahoney static void btrfs_destroy_ordered_extents(struct btrfs_root *root) 3382acce952bSliubo { 3383acce952bSliubo struct list_head splice; 3384acce952bSliubo struct btrfs_ordered_extent *ordered; 3385acce952bSliubo struct inode *inode; 3386acce952bSliubo 3387acce952bSliubo INIT_LIST_HEAD(&splice); 3388acce952bSliubo 3389acce952bSliubo spin_lock(&root->fs_info->ordered_extent_lock); 3390acce952bSliubo 3391acce952bSliubo list_splice_init(&root->fs_info->ordered_extents, &splice); 3392acce952bSliubo while (!list_empty(&splice)) { 3393acce952bSliubo ordered = list_entry(splice.next, struct btrfs_ordered_extent, 3394acce952bSliubo root_extent_list); 3395acce952bSliubo 3396acce952bSliubo list_del_init(&ordered->root_extent_list); 3397acce952bSliubo atomic_inc(&ordered->refs); 3398acce952bSliubo 3399acce952bSliubo /* the inode may be getting freed (in sys_unlink path). */ 3400acce952bSliubo inode = igrab(ordered->inode); 3401acce952bSliubo 3402acce952bSliubo spin_unlock(&root->fs_info->ordered_extent_lock); 3403acce952bSliubo if (inode) 3404acce952bSliubo iput(inode); 3405acce952bSliubo 3406acce952bSliubo atomic_set(&ordered->refs, 1); 3407acce952bSliubo btrfs_put_ordered_extent(ordered); 3408acce952bSliubo 3409acce952bSliubo spin_lock(&root->fs_info->ordered_extent_lock); 3410acce952bSliubo } 3411acce952bSliubo 3412acce952bSliubo spin_unlock(&root->fs_info->ordered_extent_lock); 3413acce952bSliubo } 3414acce952bSliubo 341579787eaaSJeff Mahoney int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, 3416acce952bSliubo struct btrfs_root *root) 3417acce952bSliubo { 3418acce952bSliubo struct rb_node *node; 3419acce952bSliubo struct btrfs_delayed_ref_root *delayed_refs; 3420acce952bSliubo struct btrfs_delayed_ref_node *ref; 3421acce952bSliubo int ret = 0; 3422acce952bSliubo 3423acce952bSliubo delayed_refs = &trans->delayed_refs; 3424acce952bSliubo 342579787eaaSJeff Mahoney again: 3426acce952bSliubo spin_lock(&delayed_refs->lock); 3427acce952bSliubo if (delayed_refs->num_entries == 0) { 3428cfece4dbSDavid Sterba spin_unlock(&delayed_refs->lock); 3429acce952bSliubo printk(KERN_INFO "delayed_refs has NO entry\n"); 3430acce952bSliubo return ret; 3431acce952bSliubo } 3432acce952bSliubo 3433acce952bSliubo node = rb_first(&delayed_refs->root); 3434acce952bSliubo while (node) { 3435acce952bSliubo ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); 3436acce952bSliubo node = rb_next(node); 3437acce952bSliubo 3438acce952bSliubo ref->in_tree = 0; 3439acce952bSliubo rb_erase(&ref->rb_node, &delayed_refs->root); 3440acce952bSliubo delayed_refs->num_entries--; 3441acce952bSliubo 3442acce952bSliubo atomic_set(&ref->refs, 1); 3443acce952bSliubo if (btrfs_delayed_ref_is_head(ref)) { 3444acce952bSliubo struct btrfs_delayed_ref_head *head; 3445acce952bSliubo 3446acce952bSliubo head = btrfs_delayed_node_to_head(ref); 344779787eaaSJeff Mahoney spin_unlock(&delayed_refs->lock); 3448acce952bSliubo mutex_lock(&head->mutex); 3449acce952bSliubo kfree(head->extent_op); 3450acce952bSliubo delayed_refs->num_heads--; 3451acce952bSliubo if (list_empty(&head->cluster)) 3452acce952bSliubo delayed_refs->num_heads_ready--; 3453acce952bSliubo list_del_init(&head->cluster); 3454acce952bSliubo mutex_unlock(&head->mutex); 345579787eaaSJeff Mahoney btrfs_put_delayed_ref(ref); 345679787eaaSJeff Mahoney goto again; 3457acce952bSliubo } 3458acce952bSliubo spin_unlock(&delayed_refs->lock); 3459acce952bSliubo btrfs_put_delayed_ref(ref); 3460acce952bSliubo 3461acce952bSliubo cond_resched(); 3462acce952bSliubo spin_lock(&delayed_refs->lock); 3463acce952bSliubo } 3464acce952bSliubo 3465acce952bSliubo spin_unlock(&delayed_refs->lock); 3466acce952bSliubo 3467acce952bSliubo return ret; 3468acce952bSliubo } 3469acce952bSliubo 3470143bede5SJeff Mahoney static void btrfs_destroy_pending_snapshots(struct btrfs_transaction *t) 3471acce952bSliubo { 3472acce952bSliubo struct btrfs_pending_snapshot *snapshot; 3473acce952bSliubo struct list_head splice; 3474acce952bSliubo 3475acce952bSliubo INIT_LIST_HEAD(&splice); 3476acce952bSliubo 3477acce952bSliubo list_splice_init(&t->pending_snapshots, &splice); 3478acce952bSliubo 3479acce952bSliubo while (!list_empty(&splice)) { 3480acce952bSliubo snapshot = list_entry(splice.next, 3481acce952bSliubo struct btrfs_pending_snapshot, 3482acce952bSliubo list); 3483acce952bSliubo 3484acce952bSliubo list_del_init(&snapshot->list); 3485acce952bSliubo 3486acce952bSliubo kfree(snapshot); 3487acce952bSliubo } 3488acce952bSliubo } 3489acce952bSliubo 3490143bede5SJeff Mahoney static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root) 3491acce952bSliubo { 3492acce952bSliubo struct btrfs_inode *btrfs_inode; 3493acce952bSliubo struct list_head splice; 3494acce952bSliubo 3495acce952bSliubo INIT_LIST_HEAD(&splice); 3496acce952bSliubo 3497acce952bSliubo spin_lock(&root->fs_info->delalloc_lock); 34985be76758SDavid Sterba list_splice_init(&root->fs_info->delalloc_inodes, &splice); 3499acce952bSliubo 3500acce952bSliubo while (!list_empty(&splice)) { 3501acce952bSliubo btrfs_inode = list_entry(splice.next, struct btrfs_inode, 3502acce952bSliubo delalloc_inodes); 3503acce952bSliubo 3504acce952bSliubo list_del_init(&btrfs_inode->delalloc_inodes); 3505acce952bSliubo 3506acce952bSliubo btrfs_invalidate_inodes(btrfs_inode->root); 3507acce952bSliubo } 3508acce952bSliubo 3509acce952bSliubo spin_unlock(&root->fs_info->delalloc_lock); 3510acce952bSliubo } 3511acce952bSliubo 3512acce952bSliubo static int btrfs_destroy_marked_extents(struct btrfs_root *root, 3513acce952bSliubo struct extent_io_tree *dirty_pages, 3514acce952bSliubo int mark) 3515acce952bSliubo { 3516acce952bSliubo int ret; 3517acce952bSliubo struct page *page; 3518acce952bSliubo struct inode *btree_inode = root->fs_info->btree_inode; 3519acce952bSliubo struct extent_buffer *eb; 3520acce952bSliubo u64 start = 0; 3521acce952bSliubo u64 end; 3522acce952bSliubo u64 offset; 3523acce952bSliubo unsigned long index; 3524acce952bSliubo 3525acce952bSliubo while (1) { 3526acce952bSliubo ret = find_first_extent_bit(dirty_pages, start, &start, &end, 3527acce952bSliubo mark); 3528acce952bSliubo if (ret) 3529acce952bSliubo break; 3530acce952bSliubo 3531acce952bSliubo clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); 3532acce952bSliubo while (start <= end) { 3533acce952bSliubo index = start >> PAGE_CACHE_SHIFT; 3534acce952bSliubo start = (u64)(index + 1) << PAGE_CACHE_SHIFT; 3535acce952bSliubo page = find_get_page(btree_inode->i_mapping, index); 3536acce952bSliubo if (!page) 3537acce952bSliubo continue; 3538acce952bSliubo offset = page_offset(page); 3539acce952bSliubo 3540acce952bSliubo spin_lock(&dirty_pages->buffer_lock); 3541acce952bSliubo eb = radix_tree_lookup( 3542acce952bSliubo &(&BTRFS_I(page->mapping->host)->io_tree)->buffer, 3543acce952bSliubo offset >> PAGE_CACHE_SHIFT); 3544acce952bSliubo spin_unlock(&dirty_pages->buffer_lock); 3545acce952bSliubo if (eb) { 3546acce952bSliubo ret = test_and_clear_bit(EXTENT_BUFFER_DIRTY, 3547acce952bSliubo &eb->bflags); 3548acce952bSliubo atomic_set(&eb->refs, 1); 3549acce952bSliubo } 3550acce952bSliubo if (PageWriteback(page)) 3551acce952bSliubo end_page_writeback(page); 3552acce952bSliubo 3553acce952bSliubo lock_page(page); 3554acce952bSliubo if (PageDirty(page)) { 3555acce952bSliubo clear_page_dirty_for_io(page); 3556acce952bSliubo spin_lock_irq(&page->mapping->tree_lock); 3557acce952bSliubo radix_tree_tag_clear(&page->mapping->page_tree, 3558acce952bSliubo page_index(page), 3559acce952bSliubo PAGECACHE_TAG_DIRTY); 3560acce952bSliubo spin_unlock_irq(&page->mapping->tree_lock); 3561acce952bSliubo } 3562acce952bSliubo 3563acce952bSliubo page->mapping->a_ops->invalidatepage(page, 0); 3564acce952bSliubo unlock_page(page); 3565acce952bSliubo } 3566acce952bSliubo } 3567acce952bSliubo 3568acce952bSliubo return ret; 3569acce952bSliubo } 3570acce952bSliubo 3571acce952bSliubo static int btrfs_destroy_pinned_extent(struct btrfs_root *root, 3572acce952bSliubo struct extent_io_tree *pinned_extents) 3573acce952bSliubo { 3574acce952bSliubo struct extent_io_tree *unpin; 3575acce952bSliubo u64 start; 3576acce952bSliubo u64 end; 3577acce952bSliubo int ret; 3578acce952bSliubo 3579acce952bSliubo unpin = pinned_extents; 3580acce952bSliubo while (1) { 3581acce952bSliubo ret = find_first_extent_bit(unpin, 0, &start, &end, 3582acce952bSliubo EXTENT_DIRTY); 3583acce952bSliubo if (ret) 3584acce952bSliubo break; 3585acce952bSliubo 3586acce952bSliubo /* opt_discard */ 35875378e607SLi Dongyang if (btrfs_test_opt(root, DISCARD)) 35885378e607SLi Dongyang ret = btrfs_error_discard_extent(root, start, 35895378e607SLi Dongyang end + 1 - start, 35905378e607SLi Dongyang NULL); 3591acce952bSliubo 3592acce952bSliubo clear_extent_dirty(unpin, start, end, GFP_NOFS); 3593acce952bSliubo btrfs_error_unpin_extent_range(root, start, end); 3594acce952bSliubo cond_resched(); 3595acce952bSliubo } 3596acce952bSliubo 3597acce952bSliubo return 0; 3598acce952bSliubo } 3599acce952bSliubo 360049b25e05SJeff Mahoney void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans, 360149b25e05SJeff Mahoney struct btrfs_root *root) 360249b25e05SJeff Mahoney { 360349b25e05SJeff Mahoney btrfs_destroy_delayed_refs(cur_trans, root); 360449b25e05SJeff Mahoney btrfs_block_rsv_release(root, &root->fs_info->trans_block_rsv, 360549b25e05SJeff Mahoney cur_trans->dirty_pages.dirty_bytes); 360649b25e05SJeff Mahoney 360749b25e05SJeff Mahoney /* FIXME: cleanup wait for commit */ 360849b25e05SJeff Mahoney cur_trans->in_commit = 1; 360949b25e05SJeff Mahoney cur_trans->blocked = 1; 361049b25e05SJeff Mahoney if (waitqueue_active(&root->fs_info->transaction_blocked_wait)) 361149b25e05SJeff Mahoney wake_up(&root->fs_info->transaction_blocked_wait); 361249b25e05SJeff Mahoney 361349b25e05SJeff Mahoney cur_trans->blocked = 0; 361449b25e05SJeff Mahoney if (waitqueue_active(&root->fs_info->transaction_wait)) 361549b25e05SJeff Mahoney wake_up(&root->fs_info->transaction_wait); 361649b25e05SJeff Mahoney 361749b25e05SJeff Mahoney cur_trans->commit_done = 1; 361849b25e05SJeff Mahoney if (waitqueue_active(&cur_trans->commit_wait)) 361949b25e05SJeff Mahoney wake_up(&cur_trans->commit_wait); 362049b25e05SJeff Mahoney 362149b25e05SJeff Mahoney btrfs_destroy_pending_snapshots(cur_trans); 362249b25e05SJeff Mahoney 362349b25e05SJeff Mahoney btrfs_destroy_marked_extents(root, &cur_trans->dirty_pages, 362449b25e05SJeff Mahoney EXTENT_DIRTY); 362549b25e05SJeff Mahoney 362649b25e05SJeff Mahoney /* 362749b25e05SJeff Mahoney memset(cur_trans, 0, sizeof(*cur_trans)); 362849b25e05SJeff Mahoney kmem_cache_free(btrfs_transaction_cachep, cur_trans); 362949b25e05SJeff Mahoney */ 363049b25e05SJeff Mahoney } 363149b25e05SJeff Mahoney 363249b25e05SJeff Mahoney int btrfs_cleanup_transaction(struct btrfs_root *root) 3633acce952bSliubo { 3634acce952bSliubo struct btrfs_transaction *t; 3635acce952bSliubo LIST_HEAD(list); 3636acce952bSliubo 3637acce952bSliubo mutex_lock(&root->fs_info->transaction_kthread_mutex); 3638acce952bSliubo 3639a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 3640acce952bSliubo list_splice_init(&root->fs_info->trans_list, &list); 3641a4abeea4SJosef Bacik root->fs_info->trans_no_join = 1; 3642a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 3643a4abeea4SJosef Bacik 3644acce952bSliubo while (!list_empty(&list)) { 3645acce952bSliubo t = list_entry(list.next, struct btrfs_transaction, list); 3646acce952bSliubo if (!t) 3647acce952bSliubo break; 3648acce952bSliubo 3649acce952bSliubo btrfs_destroy_ordered_operations(root); 3650acce952bSliubo 3651acce952bSliubo btrfs_destroy_ordered_extents(root); 3652acce952bSliubo 3653acce952bSliubo btrfs_destroy_delayed_refs(t, root); 3654acce952bSliubo 3655acce952bSliubo btrfs_block_rsv_release(root, 3656acce952bSliubo &root->fs_info->trans_block_rsv, 3657acce952bSliubo t->dirty_pages.dirty_bytes); 3658acce952bSliubo 3659acce952bSliubo /* FIXME: cleanup wait for commit */ 3660acce952bSliubo t->in_commit = 1; 3661acce952bSliubo t->blocked = 1; 3662acce952bSliubo if (waitqueue_active(&root->fs_info->transaction_blocked_wait)) 3663acce952bSliubo wake_up(&root->fs_info->transaction_blocked_wait); 3664acce952bSliubo 3665acce952bSliubo t->blocked = 0; 3666acce952bSliubo if (waitqueue_active(&root->fs_info->transaction_wait)) 3667acce952bSliubo wake_up(&root->fs_info->transaction_wait); 3668acce952bSliubo 3669acce952bSliubo t->commit_done = 1; 3670acce952bSliubo if (waitqueue_active(&t->commit_wait)) 3671acce952bSliubo wake_up(&t->commit_wait); 3672acce952bSliubo 3673acce952bSliubo btrfs_destroy_pending_snapshots(t); 3674acce952bSliubo 3675acce952bSliubo btrfs_destroy_delalloc_inodes(root); 3676acce952bSliubo 3677a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 3678acce952bSliubo root->fs_info->running_transaction = NULL; 3679a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 3680acce952bSliubo 3681acce952bSliubo btrfs_destroy_marked_extents(root, &t->dirty_pages, 3682acce952bSliubo EXTENT_DIRTY); 3683acce952bSliubo 3684acce952bSliubo btrfs_destroy_pinned_extent(root, 3685acce952bSliubo root->fs_info->pinned_extents); 3686acce952bSliubo 368713c5a93eSJosef Bacik atomic_set(&t->use_count, 0); 3688acce952bSliubo list_del_init(&t->list); 3689acce952bSliubo memset(t, 0, sizeof(*t)); 3690acce952bSliubo kmem_cache_free(btrfs_transaction_cachep, t); 3691acce952bSliubo } 3692acce952bSliubo 3693a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 3694a4abeea4SJosef Bacik root->fs_info->trans_no_join = 0; 3695a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 3696acce952bSliubo mutex_unlock(&root->fs_info->transaction_kthread_mutex); 3697acce952bSliubo 3698acce952bSliubo return 0; 3699acce952bSliubo } 3700acce952bSliubo 370179787eaaSJeff Mahoney static int btree_writepage_io_failed_hook(struct bio *bio, struct page *page, 370279787eaaSJeff Mahoney u64 start, u64 end, 370379787eaaSJeff Mahoney struct extent_state *state) 370479787eaaSJeff Mahoney { 370579787eaaSJeff Mahoney struct super_block *sb = page->mapping->host->i_sb; 370679787eaaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(sb); 370779787eaaSJeff Mahoney btrfs_error(fs_info, -EIO, 370879787eaaSJeff Mahoney "Error occured while writing out btree at %llu", start); 370979787eaaSJeff Mahoney return -EIO; 371079787eaaSJeff Mahoney } 371179787eaaSJeff Mahoney 3712d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops = { 37134bef0848SChris Mason .write_cache_pages_lock_hook = btree_lock_page_hook, 3714ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 37154bb31e92SArne Jansen .readpage_io_failed_hook = btree_io_failed_hook, 37160b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 3717239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 3718239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 371979787eaaSJeff Mahoney .writepage_io_failed_hook = btree_writepage_io_failed_hook, 37200da5468fSChris Mason }; 3721