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" 46eb60ceacSChris Mason 47d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops; 488b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work); 494df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root); 50acce952bSliubo static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info, 51acce952bSliubo int read_only); 52acce952bSliubo static int btrfs_destroy_ordered_operations(struct btrfs_root *root); 53acce952bSliubo static int btrfs_destroy_ordered_extents(struct btrfs_root *root); 54acce952bSliubo static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, 55acce952bSliubo struct btrfs_root *root); 56acce952bSliubo static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t); 57acce952bSliubo static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root); 58acce952bSliubo static int btrfs_destroy_marked_extents(struct btrfs_root *root, 59acce952bSliubo struct extent_io_tree *dirty_pages, 60acce952bSliubo int mark); 61acce952bSliubo static int btrfs_destroy_pinned_extent(struct btrfs_root *root, 62acce952bSliubo struct extent_io_tree *pinned_extents); 63acce952bSliubo static int btrfs_cleanup_transaction(struct btrfs_root *root); 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; 10144b8bd7eSChris Mason }; 10244b8bd7eSChris Mason 10385d4e461SChris Mason /* 10485d4e461SChris Mason * Lockdep class keys for extent_buffer->lock's in this root. For a given 10585d4e461SChris Mason * eb, the lockdep key is determined by the btrfs_root it belongs to and 10685d4e461SChris Mason * the level the eb occupies in the tree. 1074008c04aSChris Mason * 10885d4e461SChris Mason * Different roots are used for different purposes and may nest inside each 10985d4e461SChris Mason * other and they require separate keysets. As lockdep keys should be 11085d4e461SChris Mason * static, assign keysets according to the purpose of the root as indicated 11185d4e461SChris Mason * by btrfs_root->objectid. This ensures that all special purpose roots 11285d4e461SChris Mason * have separate keysets. 1134008c04aSChris Mason * 11485d4e461SChris Mason * Lock-nesting across peer nodes is always done with the immediate parent 11585d4e461SChris Mason * node locked thus preventing deadlock. As lockdep doesn't know this, use 11685d4e461SChris Mason * subclass to avoid triggering lockdep warning in such cases. 1174008c04aSChris Mason * 11885d4e461SChris Mason * The key is set by the readpage_end_io_hook after the buffer has passed 11985d4e461SChris Mason * csum validation but before the pages are unlocked. It is also set by 12085d4e461SChris Mason * btrfs_init_new_buffer on freshly allocated blocks. 12185d4e461SChris Mason * 12285d4e461SChris Mason * We also add a check to make sure the highest level of the tree is the 12385d4e461SChris Mason * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code 12485d4e461SChris Mason * needs update as well. 1254008c04aSChris Mason */ 1264008c04aSChris Mason #ifdef CONFIG_DEBUG_LOCK_ALLOC 1274008c04aSChris Mason # if BTRFS_MAX_LEVEL != 8 1284008c04aSChris Mason # error 1294008c04aSChris Mason # endif 13085d4e461SChris Mason 13185d4e461SChris Mason static struct btrfs_lockdep_keyset { 13285d4e461SChris Mason u64 id; /* root objectid */ 13385d4e461SChris Mason const char *name_stem; /* lock name stem */ 13485d4e461SChris Mason char names[BTRFS_MAX_LEVEL + 1][20]; 13585d4e461SChris Mason struct lock_class_key keys[BTRFS_MAX_LEVEL + 1]; 13685d4e461SChris Mason } btrfs_lockdep_keysets[] = { 13785d4e461SChris Mason { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" }, 13885d4e461SChris Mason { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" }, 13985d4e461SChris Mason { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" }, 14085d4e461SChris Mason { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" }, 14185d4e461SChris Mason { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" }, 14285d4e461SChris Mason { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" }, 14385d4e461SChris Mason { .id = BTRFS_ORPHAN_OBJECTID, .name_stem = "orphan" }, 14485d4e461SChris Mason { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" }, 14585d4e461SChris Mason { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" }, 14685d4e461SChris Mason { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" }, 14785d4e461SChris Mason { .id = 0, .name_stem = "tree" }, 1484008c04aSChris Mason }; 14985d4e461SChris Mason 15085d4e461SChris Mason void __init btrfs_init_lockdep(void) 15185d4e461SChris Mason { 15285d4e461SChris Mason int i, j; 15385d4e461SChris Mason 15485d4e461SChris Mason /* initialize lockdep class names */ 15585d4e461SChris Mason for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) { 15685d4e461SChris Mason struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i]; 15785d4e461SChris Mason 15885d4e461SChris Mason for (j = 0; j < ARRAY_SIZE(ks->names); j++) 15985d4e461SChris Mason snprintf(ks->names[j], sizeof(ks->names[j]), 16085d4e461SChris Mason "btrfs-%s-%02d", ks->name_stem, j); 16185d4e461SChris Mason } 16285d4e461SChris Mason } 16385d4e461SChris Mason 16485d4e461SChris Mason void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, 16585d4e461SChris Mason int level) 16685d4e461SChris Mason { 16785d4e461SChris Mason struct btrfs_lockdep_keyset *ks; 16885d4e461SChris Mason 16985d4e461SChris Mason BUG_ON(level >= ARRAY_SIZE(ks->keys)); 17085d4e461SChris Mason 17185d4e461SChris Mason /* find the matching keyset, id 0 is the default entry */ 17285d4e461SChris Mason for (ks = btrfs_lockdep_keysets; ks->id; ks++) 17385d4e461SChris Mason if (ks->id == objectid) 17485d4e461SChris Mason break; 17585d4e461SChris Mason 17685d4e461SChris Mason lockdep_set_class_and_name(&eb->lock, 17785d4e461SChris Mason &ks->keys[level], ks->names[level]); 17885d4e461SChris Mason } 17985d4e461SChris Mason 1804008c04aSChris Mason #endif 1814008c04aSChris Mason 182d352ac68SChris Mason /* 183d352ac68SChris Mason * extents on the btree inode are pretty simple, there's one extent 184d352ac68SChris Mason * that covers the entire device 185d352ac68SChris Mason */ 186b2950863SChristoph Hellwig static struct extent_map *btree_get_extent(struct inode *inode, 187306e16ceSDavid Sterba struct page *page, size_t pg_offset, u64 start, u64 len, 1885f39d397SChris Mason int create) 1895f39d397SChris Mason { 1905f39d397SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1915f39d397SChris Mason struct extent_map *em; 1925f39d397SChris Mason int ret; 1935f39d397SChris Mason 194890871beSChris Mason read_lock(&em_tree->lock); 195d1310b2eSChris Mason em = lookup_extent_mapping(em_tree, start, len); 196a061fc8dSChris Mason if (em) { 197a061fc8dSChris Mason em->bdev = 198a061fc8dSChris Mason BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 199890871beSChris Mason read_unlock(&em_tree->lock); 2005f39d397SChris Mason goto out; 201a061fc8dSChris Mason } 202890871beSChris Mason read_unlock(&em_tree->lock); 2037b13b7b1SChris Mason 204172ddd60SDavid Sterba em = alloc_extent_map(); 2055f39d397SChris Mason if (!em) { 2065f39d397SChris Mason em = ERR_PTR(-ENOMEM); 2075f39d397SChris Mason goto out; 2085f39d397SChris Mason } 2095f39d397SChris Mason em->start = 0; 2100afbaf8cSChris Mason em->len = (u64)-1; 211c8b97818SChris Mason em->block_len = (u64)-1; 2125f39d397SChris Mason em->block_start = 0; 213a061fc8dSChris Mason em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 214d1310b2eSChris Mason 215890871beSChris Mason write_lock(&em_tree->lock); 2165f39d397SChris Mason ret = add_extent_mapping(em_tree, em); 2175f39d397SChris Mason if (ret == -EEXIST) { 2180afbaf8cSChris Mason u64 failed_start = em->start; 2190afbaf8cSChris Mason u64 failed_len = em->len; 2200afbaf8cSChris Mason 2215f39d397SChris Mason free_extent_map(em); 2227b13b7b1SChris Mason em = lookup_extent_mapping(em_tree, start, len); 2230afbaf8cSChris Mason if (em) { 2247b13b7b1SChris Mason ret = 0; 2250afbaf8cSChris Mason } else { 2260afbaf8cSChris Mason em = lookup_extent_mapping(em_tree, failed_start, 2270afbaf8cSChris Mason failed_len); 2287b13b7b1SChris Mason ret = -EIO; 2290afbaf8cSChris Mason } 2305f39d397SChris Mason } else if (ret) { 2317b13b7b1SChris Mason free_extent_map(em); 2327b13b7b1SChris Mason em = NULL; 2335f39d397SChris Mason } 234890871beSChris Mason write_unlock(&em_tree->lock); 2357b13b7b1SChris Mason 2367b13b7b1SChris Mason if (ret) 2377b13b7b1SChris Mason em = ERR_PTR(ret); 2385f39d397SChris Mason out: 2395f39d397SChris Mason return em; 2405f39d397SChris Mason } 2415f39d397SChris Mason 24219c00ddcSChris Mason u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) 24319c00ddcSChris Mason { 244163e783eSDavid Woodhouse return crc32c(seed, data, len); 24519c00ddcSChris Mason } 24619c00ddcSChris Mason 24719c00ddcSChris Mason void btrfs_csum_final(u32 crc, char *result) 24819c00ddcSChris Mason { 2497e75bf3fSDavid Sterba put_unaligned_le32(~crc, result); 25019c00ddcSChris Mason } 25119c00ddcSChris Mason 252d352ac68SChris Mason /* 253d352ac68SChris Mason * compute the csum for a btree block, and either verify it or write it 254d352ac68SChris Mason * into the csum field of the block. 255d352ac68SChris Mason */ 25619c00ddcSChris Mason static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, 25719c00ddcSChris Mason int verify) 25819c00ddcSChris Mason { 2596c41761fSDavid Sterba u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); 260607d432dSJosef Bacik char *result = NULL; 26119c00ddcSChris Mason unsigned long len; 26219c00ddcSChris Mason unsigned long cur_len; 26319c00ddcSChris Mason unsigned long offset = BTRFS_CSUM_SIZE; 26419c00ddcSChris Mason char *kaddr; 26519c00ddcSChris Mason unsigned long map_start; 26619c00ddcSChris Mason unsigned long map_len; 26719c00ddcSChris Mason int err; 26819c00ddcSChris Mason u32 crc = ~(u32)0; 269607d432dSJosef Bacik unsigned long inline_result; 27019c00ddcSChris Mason 27119c00ddcSChris Mason len = buf->len - offset; 27219c00ddcSChris Mason while (len > 0) { 27319c00ddcSChris Mason err = map_private_extent_buffer(buf, offset, 32, 274a6591715SChris Mason &kaddr, &map_start, &map_len); 275d397712bSChris Mason if (err) 27619c00ddcSChris Mason return 1; 27719c00ddcSChris Mason cur_len = min(len, map_len - (offset - map_start)); 27819c00ddcSChris Mason crc = btrfs_csum_data(root, kaddr + offset - map_start, 27919c00ddcSChris Mason crc, cur_len); 28019c00ddcSChris Mason len -= cur_len; 28119c00ddcSChris Mason offset += cur_len; 28219c00ddcSChris Mason } 283607d432dSJosef Bacik if (csum_size > sizeof(inline_result)) { 284607d432dSJosef Bacik result = kzalloc(csum_size * sizeof(char), GFP_NOFS); 285607d432dSJosef Bacik if (!result) 286607d432dSJosef Bacik return 1; 287607d432dSJosef Bacik } else { 288607d432dSJosef Bacik result = (char *)&inline_result; 289607d432dSJosef Bacik } 290607d432dSJosef Bacik 29119c00ddcSChris Mason btrfs_csum_final(crc, result); 29219c00ddcSChris Mason 29319c00ddcSChris Mason if (verify) { 294607d432dSJosef Bacik if (memcmp_extent_buffer(buf, result, 0, csum_size)) { 295e4204dedSChris Mason u32 val; 296e4204dedSChris Mason u32 found = 0; 297607d432dSJosef Bacik memcpy(&found, result, csum_size); 298e4204dedSChris Mason 299607d432dSJosef Bacik read_extent_buffer(buf, &val, 0, csum_size); 3007a36ddecSDavid Sterba printk_ratelimited(KERN_INFO "btrfs: %s checksum verify " 301193f284dSChris Mason "failed on %llu wanted %X found %X " 302193f284dSChris Mason "level %d\n", 30319c00ddcSChris Mason root->fs_info->sb->s_id, 304193f284dSChris Mason (unsigned long long)buf->start, val, found, 305193f284dSChris Mason btrfs_header_level(buf)); 306607d432dSJosef Bacik if (result != (char *)&inline_result) 307607d432dSJosef Bacik kfree(result); 30819c00ddcSChris Mason return 1; 30919c00ddcSChris Mason } 31019c00ddcSChris Mason } else { 311607d432dSJosef Bacik write_extent_buffer(buf, result, 0, csum_size); 31219c00ddcSChris Mason } 313607d432dSJosef Bacik if (result != (char *)&inline_result) 314607d432dSJosef Bacik kfree(result); 31519c00ddcSChris Mason return 0; 31619c00ddcSChris Mason } 31719c00ddcSChris Mason 318d352ac68SChris Mason /* 319d352ac68SChris Mason * we can't consider a given block up to date unless the transid of the 320d352ac68SChris Mason * block matches the transid in the parent node's pointer. This is how we 321d352ac68SChris Mason * detect blocks that either didn't get written at all or got written 322d352ac68SChris Mason * in the wrong place. 323d352ac68SChris Mason */ 3241259ab75SChris Mason static int verify_parent_transid(struct extent_io_tree *io_tree, 3251259ab75SChris Mason struct extent_buffer *eb, u64 parent_transid) 3261259ab75SChris Mason { 3272ac55d41SJosef Bacik struct extent_state *cached_state = NULL; 3281259ab75SChris Mason int ret; 3291259ab75SChris Mason 3301259ab75SChris Mason if (!parent_transid || btrfs_header_generation(eb) == parent_transid) 3311259ab75SChris Mason return 0; 3321259ab75SChris Mason 3332ac55d41SJosef Bacik lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, 3342ac55d41SJosef Bacik 0, &cached_state, GFP_NOFS); 3352ac55d41SJosef Bacik if (extent_buffer_uptodate(io_tree, eb, cached_state) && 3361259ab75SChris Mason btrfs_header_generation(eb) == parent_transid) { 3371259ab75SChris Mason ret = 0; 3381259ab75SChris Mason goto out; 3391259ab75SChris Mason } 3407a36ddecSDavid Sterba printk_ratelimited("parent transid verify failed on %llu wanted %llu " 341193f284dSChris Mason "found %llu\n", 3421259ab75SChris Mason (unsigned long long)eb->start, 3431259ab75SChris Mason (unsigned long long)parent_transid, 3441259ab75SChris Mason (unsigned long long)btrfs_header_generation(eb)); 3451259ab75SChris Mason ret = 1; 3462ac55d41SJosef Bacik clear_extent_buffer_uptodate(io_tree, eb, &cached_state); 34733958dc6SChris Mason out: 3482ac55d41SJosef Bacik unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, 3492ac55d41SJosef Bacik &cached_state, GFP_NOFS); 3501259ab75SChris Mason return ret; 3511259ab75SChris Mason } 3521259ab75SChris Mason 353d352ac68SChris Mason /* 354d352ac68SChris Mason * helper to read a given tree block, doing retries as required when 355d352ac68SChris Mason * the checksums don't match and we have alternate mirrors to try. 356d352ac68SChris Mason */ 357f188591eSChris Mason static int btree_read_extent_buffer_pages(struct btrfs_root *root, 358f188591eSChris Mason struct extent_buffer *eb, 359ca7a79adSChris Mason u64 start, u64 parent_transid) 360f188591eSChris Mason { 361f188591eSChris Mason struct extent_io_tree *io_tree; 362f188591eSChris Mason int ret; 363f188591eSChris Mason int num_copies = 0; 364f188591eSChris Mason int mirror_num = 0; 365f188591eSChris Mason 366a826d6dcSJosef Bacik clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); 367f188591eSChris Mason io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 368f188591eSChris Mason while (1) { 369bb82ab88SArne Jansen ret = read_extent_buffer_pages(io_tree, eb, start, 370bb82ab88SArne Jansen WAIT_COMPLETE, 371f188591eSChris Mason btree_get_extent, mirror_num); 3721259ab75SChris Mason if (!ret && 3731259ab75SChris Mason !verify_parent_transid(io_tree, eb, parent_transid)) 374f188591eSChris Mason return ret; 375d397712bSChris Mason 376a826d6dcSJosef Bacik /* 377a826d6dcSJosef Bacik * This buffer's crc is fine, but its contents are corrupted, so 378a826d6dcSJosef Bacik * there is no reason to read the other copies, they won't be 379a826d6dcSJosef Bacik * any less wrong. 380a826d6dcSJosef Bacik */ 381a826d6dcSJosef Bacik if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags)) 382a826d6dcSJosef Bacik return ret; 383a826d6dcSJosef Bacik 384f188591eSChris Mason num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, 385f188591eSChris Mason eb->start, eb->len); 3864235298eSChris Mason if (num_copies == 1) 387f188591eSChris Mason return ret; 3884235298eSChris Mason 389f188591eSChris Mason mirror_num++; 3904235298eSChris Mason if (mirror_num > num_copies) 391f188591eSChris Mason return ret; 392f188591eSChris Mason } 393f188591eSChris Mason return -EIO; 394f188591eSChris Mason } 39519c00ddcSChris Mason 396d352ac68SChris Mason /* 397d397712bSChris Mason * checksum a dirty tree block before IO. This has extra checks to make sure 398d397712bSChris Mason * we only fill in the checksum field in the first page of a multi-page block 399d352ac68SChris Mason */ 400d397712bSChris Mason 401b2950863SChristoph Hellwig static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) 40219c00ddcSChris Mason { 403d1310b2eSChris Mason struct extent_io_tree *tree; 40435ebb934SChris Mason u64 start = (u64)page->index << PAGE_CACHE_SHIFT; 40519c00ddcSChris Mason u64 found_start; 40619c00ddcSChris Mason unsigned long len; 40719c00ddcSChris Mason struct extent_buffer *eb; 408f188591eSChris Mason int ret; 409f188591eSChris Mason 410d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 41119c00ddcSChris Mason 412eb14ab8eSChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 413eb14ab8eSChris Mason WARN_ON(1); 41419c00ddcSChris Mason goto out; 415eb14ab8eSChris Mason } 416eb14ab8eSChris Mason if (!page->private) { 417eb14ab8eSChris Mason WARN_ON(1); 41819c00ddcSChris Mason goto out; 419eb14ab8eSChris Mason } 42019c00ddcSChris Mason len = page->private >> 2; 421d397712bSChris Mason WARN_ON(len == 0); 422d397712bSChris Mason 423ba144192SDavid Sterba eb = alloc_extent_buffer(tree, start, len, page); 42491ca338dSTsutomu Itoh if (eb == NULL) { 42591ca338dSTsutomu Itoh WARN_ON(1); 42691ca338dSTsutomu Itoh goto out; 42791ca338dSTsutomu Itoh } 428ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, 429ca7a79adSChris Mason btrfs_header_generation(eb)); 430f188591eSChris Mason BUG_ON(ret); 431784b4e29SChris Mason WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN)); 432784b4e29SChris Mason 43319c00ddcSChris Mason found_start = btrfs_header_bytenr(eb); 43419c00ddcSChris Mason if (found_start != start) { 43555c69072SChris Mason WARN_ON(1); 43655c69072SChris Mason goto err; 43755c69072SChris Mason } 43855c69072SChris Mason if (eb->first_page != page) { 43955c69072SChris Mason WARN_ON(1); 44055c69072SChris Mason goto err; 44155c69072SChris Mason } 44255c69072SChris Mason if (!PageUptodate(page)) { 44355c69072SChris Mason WARN_ON(1); 44455c69072SChris Mason goto err; 44519c00ddcSChris Mason } 44619c00ddcSChris Mason csum_tree_block(root, eb, 0); 44755c69072SChris Mason err: 44819c00ddcSChris Mason free_extent_buffer(eb); 44919c00ddcSChris Mason out: 45019c00ddcSChris Mason return 0; 45119c00ddcSChris Mason } 45219c00ddcSChris Mason 4532b82032cSYan Zheng static int check_tree_block_fsid(struct btrfs_root *root, 4542b82032cSYan Zheng struct extent_buffer *eb) 4552b82032cSYan Zheng { 4562b82032cSYan Zheng struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 4572b82032cSYan Zheng u8 fsid[BTRFS_UUID_SIZE]; 4582b82032cSYan Zheng int ret = 1; 4592b82032cSYan Zheng 4602b82032cSYan Zheng read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), 4612b82032cSYan Zheng BTRFS_FSID_SIZE); 4622b82032cSYan Zheng while (fs_devices) { 4632b82032cSYan Zheng if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { 4642b82032cSYan Zheng ret = 0; 4652b82032cSYan Zheng break; 4662b82032cSYan Zheng } 4672b82032cSYan Zheng fs_devices = fs_devices->seed; 4682b82032cSYan Zheng } 4692b82032cSYan Zheng return ret; 4702b82032cSYan Zheng } 4712b82032cSYan Zheng 472a826d6dcSJosef Bacik #define CORRUPT(reason, eb, root, slot) \ 473a826d6dcSJosef Bacik printk(KERN_CRIT "btrfs: corrupt leaf, %s: block=%llu," \ 474a826d6dcSJosef Bacik "root=%llu, slot=%d\n", reason, \ 475a826d6dcSJosef Bacik (unsigned long long)btrfs_header_bytenr(eb), \ 476a826d6dcSJosef Bacik (unsigned long long)root->objectid, slot) 477a826d6dcSJosef Bacik 478a826d6dcSJosef Bacik static noinline int check_leaf(struct btrfs_root *root, 479a826d6dcSJosef Bacik struct extent_buffer *leaf) 480a826d6dcSJosef Bacik { 481a826d6dcSJosef Bacik struct btrfs_key key; 482a826d6dcSJosef Bacik struct btrfs_key leaf_key; 483a826d6dcSJosef Bacik u32 nritems = btrfs_header_nritems(leaf); 484a826d6dcSJosef Bacik int slot; 485a826d6dcSJosef Bacik 486a826d6dcSJosef Bacik if (nritems == 0) 487a826d6dcSJosef Bacik return 0; 488a826d6dcSJosef Bacik 489a826d6dcSJosef Bacik /* Check the 0 item */ 490a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) != 491a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 492a826d6dcSJosef Bacik CORRUPT("invalid item offset size pair", leaf, root, 0); 493a826d6dcSJosef Bacik return -EIO; 494a826d6dcSJosef Bacik } 495a826d6dcSJosef Bacik 496a826d6dcSJosef Bacik /* 497a826d6dcSJosef Bacik * Check to make sure each items keys are in the correct order and their 498a826d6dcSJosef Bacik * offsets make sense. We only have to loop through nritems-1 because 499a826d6dcSJosef Bacik * we check the current slot against the next slot, which verifies the 500a826d6dcSJosef Bacik * next slot's offset+size makes sense and that the current's slot 501a826d6dcSJosef Bacik * offset is correct. 502a826d6dcSJosef Bacik */ 503a826d6dcSJosef Bacik for (slot = 0; slot < nritems - 1; slot++) { 504a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &leaf_key, slot); 505a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &key, slot + 1); 506a826d6dcSJosef Bacik 507a826d6dcSJosef Bacik /* Make sure the keys are in the right order */ 508a826d6dcSJosef Bacik if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) { 509a826d6dcSJosef Bacik CORRUPT("bad key order", leaf, root, slot); 510a826d6dcSJosef Bacik return -EIO; 511a826d6dcSJosef Bacik } 512a826d6dcSJosef Bacik 513a826d6dcSJosef Bacik /* 514a826d6dcSJosef Bacik * Make sure the offset and ends are right, remember that the 515a826d6dcSJosef Bacik * item data starts at the end of the leaf and grows towards the 516a826d6dcSJosef Bacik * front. 517a826d6dcSJosef Bacik */ 518a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, slot) != 519a826d6dcSJosef Bacik btrfs_item_end_nr(leaf, slot + 1)) { 520a826d6dcSJosef Bacik CORRUPT("slot offset bad", leaf, root, slot); 521a826d6dcSJosef Bacik return -EIO; 522a826d6dcSJosef Bacik } 523a826d6dcSJosef Bacik 524a826d6dcSJosef Bacik /* 525a826d6dcSJosef Bacik * Check to make sure that we don't point outside of the leaf, 526a826d6dcSJosef Bacik * just incase all the items are consistent to eachother, but 527a826d6dcSJosef Bacik * all point outside of the leaf. 528a826d6dcSJosef Bacik */ 529a826d6dcSJosef Bacik if (btrfs_item_end_nr(leaf, slot) > 530a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 531a826d6dcSJosef Bacik CORRUPT("slot end outside of leaf", leaf, root, slot); 532a826d6dcSJosef Bacik return -EIO; 533a826d6dcSJosef Bacik } 534a826d6dcSJosef Bacik } 535a826d6dcSJosef Bacik 536a826d6dcSJosef Bacik return 0; 537a826d6dcSJosef Bacik } 538a826d6dcSJosef Bacik 539b2950863SChristoph Hellwig static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, 540ce9adaa5SChris Mason struct extent_state *state) 541ce9adaa5SChris Mason { 542ce9adaa5SChris Mason struct extent_io_tree *tree; 543ce9adaa5SChris Mason u64 found_start; 544ce9adaa5SChris Mason int found_level; 545ce9adaa5SChris Mason unsigned long len; 546ce9adaa5SChris Mason struct extent_buffer *eb; 547ce9adaa5SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 548f188591eSChris Mason int ret = 0; 549ce9adaa5SChris Mason 550ce9adaa5SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 551ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 552ce9adaa5SChris Mason goto out; 553ce9adaa5SChris Mason if (!page->private) 554ce9adaa5SChris Mason goto out; 555d397712bSChris Mason 556ce9adaa5SChris Mason len = page->private >> 2; 557d397712bSChris Mason WARN_ON(len == 0); 558d397712bSChris Mason 559ba144192SDavid Sterba eb = alloc_extent_buffer(tree, start, len, page); 56091ca338dSTsutomu Itoh if (eb == NULL) { 56191ca338dSTsutomu Itoh ret = -EIO; 56291ca338dSTsutomu Itoh goto out; 56391ca338dSTsutomu Itoh } 564f188591eSChris Mason 565ce9adaa5SChris Mason found_start = btrfs_header_bytenr(eb); 56623a07867SChris Mason if (found_start != start) { 5677a36ddecSDavid Sterba printk_ratelimited(KERN_INFO "btrfs bad tree block start " 568193f284dSChris Mason "%llu %llu\n", 569a1b32a59SChris Mason (unsigned long long)found_start, 570a1b32a59SChris Mason (unsigned long long)eb->start); 571f188591eSChris Mason ret = -EIO; 572ce9adaa5SChris Mason goto err; 573ce9adaa5SChris Mason } 574ce9adaa5SChris Mason if (eb->first_page != page) { 575d397712bSChris Mason printk(KERN_INFO "btrfs bad first page %lu %lu\n", 576d397712bSChris Mason eb->first_page->index, page->index); 577ce9adaa5SChris Mason WARN_ON(1); 578f188591eSChris Mason ret = -EIO; 579ce9adaa5SChris Mason goto err; 580ce9adaa5SChris Mason } 5812b82032cSYan Zheng if (check_tree_block_fsid(root, eb)) { 5827a36ddecSDavid Sterba printk_ratelimited(KERN_INFO "btrfs bad fsid on block %llu\n", 583d397712bSChris Mason (unsigned long long)eb->start); 5841259ab75SChris Mason ret = -EIO; 5851259ab75SChris Mason goto err; 5861259ab75SChris Mason } 587ce9adaa5SChris Mason found_level = btrfs_header_level(eb); 588ce9adaa5SChris Mason 58985d4e461SChris Mason btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), 59085d4e461SChris Mason eb, found_level); 5914008c04aSChris Mason 592ce9adaa5SChris Mason ret = csum_tree_block(root, eb, 1); 593a826d6dcSJosef Bacik if (ret) { 594f188591eSChris Mason ret = -EIO; 595a826d6dcSJosef Bacik goto err; 596a826d6dcSJosef Bacik } 597a826d6dcSJosef Bacik 598a826d6dcSJosef Bacik /* 599a826d6dcSJosef Bacik * If this is a leaf block and it is corrupt, set the corrupt bit so 600a826d6dcSJosef Bacik * that we don't try and read the other copies of this block, just 601a826d6dcSJosef Bacik * return -EIO. 602a826d6dcSJosef Bacik */ 603a826d6dcSJosef Bacik if (found_level == 0 && check_leaf(root, eb)) { 604a826d6dcSJosef Bacik set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); 605a826d6dcSJosef Bacik ret = -EIO; 606a826d6dcSJosef Bacik } 607ce9adaa5SChris Mason 608ce9adaa5SChris Mason end = min_t(u64, eb->len, PAGE_CACHE_SIZE); 609ce9adaa5SChris Mason end = eb->start + end - 1; 610ce9adaa5SChris Mason err: 6114bb31e92SArne Jansen if (test_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) { 6124bb31e92SArne Jansen clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags); 6134bb31e92SArne Jansen btree_readahead_hook(root, eb, eb->start, ret); 6144bb31e92SArne Jansen } 6154bb31e92SArne Jansen 616ce9adaa5SChris Mason free_extent_buffer(eb); 617ce9adaa5SChris Mason out: 618f188591eSChris Mason return ret; 619ce9adaa5SChris Mason } 620ce9adaa5SChris Mason 6214bb31e92SArne Jansen static int btree_io_failed_hook(struct bio *failed_bio, 6224bb31e92SArne Jansen struct page *page, u64 start, u64 end, 623806468f8SChris Mason u64 mirror_num, struct extent_state *state) 6244bb31e92SArne Jansen { 6254bb31e92SArne Jansen struct extent_io_tree *tree; 6264bb31e92SArne Jansen unsigned long len; 6274bb31e92SArne Jansen struct extent_buffer *eb; 6284bb31e92SArne Jansen struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 6294bb31e92SArne Jansen 6304bb31e92SArne Jansen tree = &BTRFS_I(page->mapping->host)->io_tree; 6314bb31e92SArne Jansen if (page->private == EXTENT_PAGE_PRIVATE) 6324bb31e92SArne Jansen goto out; 6334bb31e92SArne Jansen if (!page->private) 6344bb31e92SArne Jansen goto out; 6354bb31e92SArne Jansen 6364bb31e92SArne Jansen len = page->private >> 2; 6374bb31e92SArne Jansen WARN_ON(len == 0); 6384bb31e92SArne Jansen 6394bb31e92SArne Jansen eb = alloc_extent_buffer(tree, start, len, page); 6404bb31e92SArne Jansen if (eb == NULL) 6414bb31e92SArne Jansen goto out; 6424bb31e92SArne Jansen 6434bb31e92SArne Jansen if (test_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) { 6444bb31e92SArne Jansen clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags); 6454bb31e92SArne Jansen btree_readahead_hook(root, eb, eb->start, -EIO); 6464bb31e92SArne Jansen } 647c674e04eSChris Mason free_extent_buffer(eb); 6484bb31e92SArne Jansen 6494bb31e92SArne Jansen out: 6504bb31e92SArne Jansen return -EIO; /* we fixed nothing */ 6514bb31e92SArne Jansen } 6524bb31e92SArne Jansen 653ce9adaa5SChris Mason static void end_workqueue_bio(struct bio *bio, int err) 654ce9adaa5SChris Mason { 655ce9adaa5SChris Mason struct end_io_wq *end_io_wq = bio->bi_private; 656ce9adaa5SChris Mason struct btrfs_fs_info *fs_info; 657ce9adaa5SChris Mason 658ce9adaa5SChris Mason fs_info = end_io_wq->info; 659ce9adaa5SChris Mason end_io_wq->error = err; 6608b712842SChris Mason end_io_wq->work.func = end_workqueue_fn; 6618b712842SChris Mason end_io_wq->work.flags = 0; 662d20f7043SChris Mason 6637b6d91daSChristoph Hellwig if (bio->bi_rw & REQ_WRITE) { 6640cb59c99SJosef Bacik if (end_io_wq->metadata == 1) 665cad321adSChris Mason btrfs_queue_worker(&fs_info->endio_meta_write_workers, 666cad321adSChris Mason &end_io_wq->work); 6670cb59c99SJosef Bacik else if (end_io_wq->metadata == 2) 6680cb59c99SJosef Bacik btrfs_queue_worker(&fs_info->endio_freespace_worker, 6690cb59c99SJosef Bacik &end_io_wq->work); 670cad321adSChris Mason else 671e6dcd2dcSChris Mason btrfs_queue_worker(&fs_info->endio_write_workers, 672e6dcd2dcSChris Mason &end_io_wq->work); 673d20f7043SChris Mason } else { 674d20f7043SChris Mason if (end_io_wq->metadata) 675d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_meta_workers, 676d20f7043SChris Mason &end_io_wq->work); 677e6dcd2dcSChris Mason else 678d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_workers, 679d20f7043SChris Mason &end_io_wq->work); 680d20f7043SChris Mason } 681ce9adaa5SChris Mason } 682ce9adaa5SChris Mason 6830cb59c99SJosef Bacik /* 6840cb59c99SJosef Bacik * For the metadata arg you want 6850cb59c99SJosef Bacik * 6860cb59c99SJosef Bacik * 0 - if data 6870cb59c99SJosef Bacik * 1 - if normal metadta 6880cb59c99SJosef Bacik * 2 - if writing to the free space cache area 6890cb59c99SJosef Bacik */ 69022c59948SChris Mason int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 69122c59948SChris Mason int metadata) 6920b86a832SChris Mason { 693ce9adaa5SChris Mason struct end_io_wq *end_io_wq; 694ce9adaa5SChris Mason end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); 695ce9adaa5SChris Mason if (!end_io_wq) 696ce9adaa5SChris Mason return -ENOMEM; 697ce9adaa5SChris Mason 698ce9adaa5SChris Mason end_io_wq->private = bio->bi_private; 699ce9adaa5SChris Mason end_io_wq->end_io = bio->bi_end_io; 70022c59948SChris Mason end_io_wq->info = info; 701ce9adaa5SChris Mason end_io_wq->error = 0; 702ce9adaa5SChris Mason end_io_wq->bio = bio; 70322c59948SChris Mason end_io_wq->metadata = metadata; 704ce9adaa5SChris Mason 705ce9adaa5SChris Mason bio->bi_private = end_io_wq; 706ce9adaa5SChris Mason bio->bi_end_io = end_workqueue_bio; 70722c59948SChris Mason return 0; 70822c59948SChris Mason } 70922c59948SChris Mason 710b64a2851SChris Mason unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) 7114854ddd0SChris Mason { 7124854ddd0SChris Mason unsigned long limit = min_t(unsigned long, 7134854ddd0SChris Mason info->workers.max_workers, 7144854ddd0SChris Mason info->fs_devices->open_devices); 7154854ddd0SChris Mason return 256 * limit; 7164854ddd0SChris Mason } 7174854ddd0SChris Mason 7184a69a410SChris Mason static void run_one_async_start(struct btrfs_work *work) 7194a69a410SChris Mason { 7204a69a410SChris Mason struct async_submit_bio *async; 7214a69a410SChris Mason 7224a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 7234a69a410SChris Mason async->submit_bio_start(async->inode, async->rw, async->bio, 724eaf25d93SChris Mason async->mirror_num, async->bio_flags, 725eaf25d93SChris Mason async->bio_offset); 7264a69a410SChris Mason } 7274a69a410SChris Mason 7284a69a410SChris Mason static void run_one_async_done(struct btrfs_work *work) 7298b712842SChris Mason { 7308b712842SChris Mason struct btrfs_fs_info *fs_info; 7318b712842SChris Mason struct async_submit_bio *async; 7324854ddd0SChris Mason int limit; 7338b712842SChris Mason 7348b712842SChris Mason async = container_of(work, struct async_submit_bio, work); 7358b712842SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 7364854ddd0SChris Mason 737b64a2851SChris Mason limit = btrfs_async_submit_limit(fs_info); 7384854ddd0SChris Mason limit = limit * 2 / 3; 7394854ddd0SChris Mason 7408b712842SChris Mason atomic_dec(&fs_info->nr_async_submits); 7410986fe9eSChris Mason 742b64a2851SChris Mason if (atomic_read(&fs_info->nr_async_submits) < limit && 743b64a2851SChris Mason waitqueue_active(&fs_info->async_submit_wait)) 7444854ddd0SChris Mason wake_up(&fs_info->async_submit_wait); 7454854ddd0SChris Mason 7464a69a410SChris Mason async->submit_bio_done(async->inode, async->rw, async->bio, 747eaf25d93SChris Mason async->mirror_num, async->bio_flags, 748eaf25d93SChris Mason async->bio_offset); 7494a69a410SChris Mason } 7504a69a410SChris Mason 7514a69a410SChris Mason static void run_one_async_free(struct btrfs_work *work) 7524a69a410SChris Mason { 7534a69a410SChris Mason struct async_submit_bio *async; 7544a69a410SChris Mason 7554a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 7568b712842SChris Mason kfree(async); 7578b712842SChris Mason } 7588b712842SChris Mason 75944b8bd7eSChris Mason int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 76044b8bd7eSChris Mason int rw, struct bio *bio, int mirror_num, 761c8b97818SChris Mason unsigned long bio_flags, 762eaf25d93SChris Mason u64 bio_offset, 7634a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start, 7644a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done) 76544b8bd7eSChris Mason { 76644b8bd7eSChris Mason struct async_submit_bio *async; 76744b8bd7eSChris Mason 76844b8bd7eSChris Mason async = kmalloc(sizeof(*async), GFP_NOFS); 76944b8bd7eSChris Mason if (!async) 77044b8bd7eSChris Mason return -ENOMEM; 77144b8bd7eSChris Mason 77244b8bd7eSChris Mason async->inode = inode; 77344b8bd7eSChris Mason async->rw = rw; 77444b8bd7eSChris Mason async->bio = bio; 77544b8bd7eSChris Mason async->mirror_num = mirror_num; 7764a69a410SChris Mason async->submit_bio_start = submit_bio_start; 7774a69a410SChris Mason async->submit_bio_done = submit_bio_done; 7784a69a410SChris Mason 7794a69a410SChris Mason async->work.func = run_one_async_start; 7804a69a410SChris Mason async->work.ordered_func = run_one_async_done; 7814a69a410SChris Mason async->work.ordered_free = run_one_async_free; 7824a69a410SChris Mason 7838b712842SChris Mason async->work.flags = 0; 784c8b97818SChris Mason async->bio_flags = bio_flags; 785eaf25d93SChris Mason async->bio_offset = bio_offset; 7868c8bee1dSChris Mason 787cb03c743SChris Mason atomic_inc(&fs_info->nr_async_submits); 788d313d7a3SChris Mason 7897b6d91daSChristoph Hellwig if (rw & REQ_SYNC) 790d313d7a3SChris Mason btrfs_set_work_high_prio(&async->work); 791d313d7a3SChris Mason 7928b712842SChris Mason btrfs_queue_worker(&fs_info->workers, &async->work); 7939473f16cSChris Mason 794771ed689SChris Mason while (atomic_read(&fs_info->async_submit_draining) && 795771ed689SChris Mason atomic_read(&fs_info->nr_async_submits)) { 796771ed689SChris Mason wait_event(fs_info->async_submit_wait, 797771ed689SChris Mason (atomic_read(&fs_info->nr_async_submits) == 0)); 798771ed689SChris Mason } 799771ed689SChris Mason 80044b8bd7eSChris Mason return 0; 80144b8bd7eSChris Mason } 80244b8bd7eSChris Mason 803ce3ed71aSChris Mason static int btree_csum_one_bio(struct bio *bio) 804ce3ed71aSChris Mason { 805ce3ed71aSChris Mason struct bio_vec *bvec = bio->bi_io_vec; 806ce3ed71aSChris Mason int bio_index = 0; 807ce3ed71aSChris Mason struct btrfs_root *root; 808ce3ed71aSChris Mason 809ce3ed71aSChris Mason WARN_ON(bio->bi_vcnt <= 0); 810ce3ed71aSChris Mason while (bio_index < bio->bi_vcnt) { 811ce3ed71aSChris Mason root = BTRFS_I(bvec->bv_page->mapping->host)->root; 812ce3ed71aSChris Mason csum_dirty_buffer(root, bvec->bv_page); 813ce3ed71aSChris Mason bio_index++; 814ce3ed71aSChris Mason bvec++; 815ce3ed71aSChris Mason } 816ce3ed71aSChris Mason return 0; 817ce3ed71aSChris Mason } 818ce3ed71aSChris Mason 8194a69a410SChris Mason static int __btree_submit_bio_start(struct inode *inode, int rw, 8204a69a410SChris Mason struct bio *bio, int mirror_num, 821eaf25d93SChris Mason unsigned long bio_flags, 822eaf25d93SChris Mason u64 bio_offset) 82322c59948SChris Mason { 8248b712842SChris Mason /* 8258b712842SChris Mason * when we're called for a write, we're already in the async 8265443be45SChris Mason * submission context. Just jump into btrfs_map_bio 8278b712842SChris Mason */ 828ce3ed71aSChris Mason btree_csum_one_bio(bio); 8294a69a410SChris Mason return 0; 83022c59948SChris Mason } 83122c59948SChris Mason 8324a69a410SChris Mason static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, 833eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 834eaf25d93SChris Mason u64 bio_offset) 8354a69a410SChris Mason { 8368b712842SChris Mason /* 8374a69a410SChris Mason * when we're called for a write, we're already in the async 8384a69a410SChris Mason * submission context. Just jump into btrfs_map_bio 8398b712842SChris Mason */ 8408b712842SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); 8410b86a832SChris Mason } 8420b86a832SChris Mason 84344b8bd7eSChris Mason static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 844eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 845eaf25d93SChris Mason u64 bio_offset) 84644b8bd7eSChris Mason { 8474a69a410SChris Mason int ret; 848cad321adSChris Mason 8494a69a410SChris Mason ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, 8504a69a410SChris Mason bio, 1); 8514a69a410SChris Mason BUG_ON(ret); 8524a69a410SChris Mason 8537b6d91daSChristoph Hellwig if (!(rw & REQ_WRITE)) { 854cad321adSChris Mason /* 855cad321adSChris Mason * called for a read, do the setup so that checksum validation 856cad321adSChris Mason * can happen in the async kernel threads 857cad321adSChris Mason */ 8584a69a410SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 8596f3577bdSChris Mason mirror_num, 0); 86044b8bd7eSChris Mason } 861d313d7a3SChris Mason 862cad321adSChris Mason /* 863cad321adSChris Mason * kthread helpers are used to submit writes so that checksumming 864cad321adSChris Mason * can happen in parallel across all CPUs 865cad321adSChris Mason */ 86644b8bd7eSChris Mason return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, 867c8b97818SChris Mason inode, rw, bio, mirror_num, 0, 868eaf25d93SChris Mason bio_offset, 8694a69a410SChris Mason __btree_submit_bio_start, 8704a69a410SChris Mason __btree_submit_bio_done); 87144b8bd7eSChris Mason } 87244b8bd7eSChris Mason 8733dd1462eSJan Beulich #ifdef CONFIG_MIGRATION 874784b4e29SChris Mason static int btree_migratepage(struct address_space *mapping, 875784b4e29SChris Mason struct page *newpage, struct page *page) 876784b4e29SChris Mason { 877784b4e29SChris Mason /* 878784b4e29SChris Mason * we can't safely write a btree page from here, 879784b4e29SChris Mason * we haven't done the locking hook 880784b4e29SChris Mason */ 881784b4e29SChris Mason if (PageDirty(page)) 882784b4e29SChris Mason return -EAGAIN; 883784b4e29SChris Mason /* 884784b4e29SChris Mason * Buffers may be managed in a filesystem specific way. 885784b4e29SChris Mason * We must have no buffers or drop them. 886784b4e29SChris Mason */ 887784b4e29SChris Mason if (page_has_private(page) && 888784b4e29SChris Mason !try_to_release_page(page, GFP_KERNEL)) 889784b4e29SChris Mason return -EAGAIN; 890784b4e29SChris Mason return migrate_page(mapping, newpage, page); 891784b4e29SChris Mason } 8923dd1462eSJan Beulich #endif 893784b4e29SChris Mason 8945f39d397SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 8955f39d397SChris Mason { 896d1310b2eSChris Mason struct extent_io_tree *tree; 897b9473439SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 898b9473439SChris Mason struct extent_buffer *eb; 899b9473439SChris Mason int was_dirty; 9005443be45SChris Mason 901b9473439SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 902b9473439SChris Mason if (!(current->flags & PF_MEMALLOC)) { 903b9473439SChris Mason return extent_write_full_page(tree, page, 904b9473439SChris Mason btree_get_extent, wbc); 905b9473439SChris Mason } 906b9473439SChris Mason 9075443be45SChris Mason redirty_page_for_writepage(wbc, page); 908784b4e29SChris Mason eb = btrfs_find_tree_block(root, page_offset(page), PAGE_CACHE_SIZE); 909b9473439SChris Mason WARN_ON(!eb); 910b9473439SChris Mason 911b9473439SChris Mason was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); 912b9473439SChris Mason if (!was_dirty) { 913b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 914b9473439SChris Mason root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE; 915b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 916b9473439SChris Mason } 917b9473439SChris Mason free_extent_buffer(eb); 918b9473439SChris Mason 9195443be45SChris Mason unlock_page(page); 9205443be45SChris Mason return 0; 9215443be45SChris Mason } 9220da5468fSChris Mason 9230da5468fSChris Mason static int btree_writepages(struct address_space *mapping, 9240da5468fSChris Mason struct writeback_control *wbc) 9250da5468fSChris Mason { 926d1310b2eSChris Mason struct extent_io_tree *tree; 927d1310b2eSChris Mason tree = &BTRFS_I(mapping->host)->io_tree; 928d8d5f3e1SChris Mason if (wbc->sync_mode == WB_SYNC_NONE) { 929b9473439SChris Mason struct btrfs_root *root = BTRFS_I(mapping->host)->root; 930793955bcSChris Mason u64 num_dirty; 93124ab9cd8SChris Mason unsigned long thresh = 32 * 1024 * 1024; 932448d640bSChris Mason 933448d640bSChris Mason if (wbc->for_kupdate) 934448d640bSChris Mason return 0; 935448d640bSChris Mason 936b9473439SChris Mason /* this is a bit racy, but that's ok */ 937b9473439SChris Mason num_dirty = root->fs_info->dirty_metadata_bytes; 938d397712bSChris Mason if (num_dirty < thresh) 939793955bcSChris Mason return 0; 940793955bcSChris Mason } 9410da5468fSChris Mason return extent_writepages(tree, mapping, btree_get_extent, wbc); 9420da5468fSChris Mason } 9430da5468fSChris Mason 944b2950863SChristoph Hellwig static int btree_readpage(struct file *file, struct page *page) 9455f39d397SChris Mason { 946d1310b2eSChris Mason struct extent_io_tree *tree; 947d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 9488ddc7d9cSJan Schmidt return extent_read_full_page(tree, page, btree_get_extent, 0); 9495f39d397SChris Mason } 9505f39d397SChris Mason 95170dec807SChris Mason static int btree_releasepage(struct page *page, gfp_t gfp_flags) 9525f39d397SChris Mason { 953d1310b2eSChris Mason struct extent_io_tree *tree; 954d1310b2eSChris Mason struct extent_map_tree *map; 9555f39d397SChris Mason int ret; 9565f39d397SChris Mason 95798509cfcSChris Mason if (PageWriteback(page) || PageDirty(page)) 95898509cfcSChris Mason return 0; 95998509cfcSChris Mason 960d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 961d1310b2eSChris Mason map = &BTRFS_I(page->mapping->host)->extent_tree; 9626af118ceSChris Mason 9637b13b7b1SChris Mason ret = try_release_extent_state(map, tree, page, gfp_flags); 964d397712bSChris Mason if (!ret) 9656af118ceSChris Mason return 0; 9666af118ceSChris Mason 9676af118ceSChris Mason ret = try_release_extent_buffer(tree, page); 9685f39d397SChris Mason if (ret == 1) { 9695f39d397SChris Mason ClearPagePrivate(page); 9705f39d397SChris Mason set_page_private(page, 0); 971d98237b3SChris Mason page_cache_release(page); 9725f39d397SChris Mason } 9736af118ceSChris Mason 974d98237b3SChris Mason return ret; 975d98237b3SChris Mason } 976d98237b3SChris Mason 9775f39d397SChris Mason static void btree_invalidatepage(struct page *page, unsigned long offset) 978d98237b3SChris Mason { 979d1310b2eSChris Mason struct extent_io_tree *tree; 980d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 9815f39d397SChris Mason extent_invalidatepage(tree, page, offset); 9825f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 9839ad6b7bcSChris Mason if (PagePrivate(page)) { 984d397712bSChris Mason printk(KERN_WARNING "btrfs warning page private not zero " 985d397712bSChris Mason "on page %llu\n", (unsigned long long)page_offset(page)); 9869ad6b7bcSChris Mason ClearPagePrivate(page); 9879ad6b7bcSChris Mason set_page_private(page, 0); 9889ad6b7bcSChris Mason page_cache_release(page); 9899ad6b7bcSChris Mason } 990d98237b3SChris Mason } 991d98237b3SChris Mason 9927f09410bSAlexey Dobriyan static const struct address_space_operations btree_aops = { 993d98237b3SChris Mason .readpage = btree_readpage, 994d98237b3SChris Mason .writepage = btree_writepage, 9950da5468fSChris Mason .writepages = btree_writepages, 9965f39d397SChris Mason .releasepage = btree_releasepage, 9975f39d397SChris Mason .invalidatepage = btree_invalidatepage, 9985a92bc88SChris Mason #ifdef CONFIG_MIGRATION 999784b4e29SChris Mason .migratepage = btree_migratepage, 10005a92bc88SChris Mason #endif 1001d98237b3SChris Mason }; 1002123abc88SChris Mason 1003ca7a79adSChris Mason int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, 1004ca7a79adSChris Mason u64 parent_transid) 1005090d1875SChris Mason { 10065f39d397SChris Mason struct extent_buffer *buf = NULL; 10075f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1008de428b63SChris Mason int ret = 0; 1009090d1875SChris Mason 1010db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 10115f39d397SChris Mason if (!buf) 1012090d1875SChris Mason return 0; 1013d1310b2eSChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, 1014bb82ab88SArne Jansen buf, 0, WAIT_NONE, btree_get_extent, 0); 10155f39d397SChris Mason free_extent_buffer(buf); 1016de428b63SChris Mason return ret; 1017090d1875SChris Mason } 1018090d1875SChris Mason 1019ab0fff03SArne Jansen int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize, 1020ab0fff03SArne Jansen int mirror_num, struct extent_buffer **eb) 1021ab0fff03SArne Jansen { 1022ab0fff03SArne Jansen struct extent_buffer *buf = NULL; 1023ab0fff03SArne Jansen struct inode *btree_inode = root->fs_info->btree_inode; 1024ab0fff03SArne Jansen struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree; 1025ab0fff03SArne Jansen int ret; 1026ab0fff03SArne Jansen 1027ab0fff03SArne Jansen buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 1028ab0fff03SArne Jansen if (!buf) 1029ab0fff03SArne Jansen return 0; 1030ab0fff03SArne Jansen 1031ab0fff03SArne Jansen set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags); 1032ab0fff03SArne Jansen 1033ab0fff03SArne Jansen ret = read_extent_buffer_pages(io_tree, buf, 0, WAIT_PAGE_LOCK, 1034ab0fff03SArne Jansen btree_get_extent, mirror_num); 1035ab0fff03SArne Jansen if (ret) { 1036ab0fff03SArne Jansen free_extent_buffer(buf); 1037ab0fff03SArne Jansen return ret; 1038ab0fff03SArne Jansen } 1039ab0fff03SArne Jansen 1040ab0fff03SArne Jansen if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) { 1041ab0fff03SArne Jansen free_extent_buffer(buf); 1042ab0fff03SArne Jansen return -EIO; 1043ab0fff03SArne Jansen } else if (extent_buffer_uptodate(io_tree, buf, NULL)) { 1044ab0fff03SArne Jansen *eb = buf; 1045ab0fff03SArne Jansen } else { 1046ab0fff03SArne Jansen free_extent_buffer(buf); 1047ab0fff03SArne Jansen } 1048ab0fff03SArne Jansen return 0; 1049ab0fff03SArne Jansen } 1050ab0fff03SArne Jansen 10510999df54SChris Mason struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, 10520999df54SChris Mason u64 bytenr, u32 blocksize) 10530999df54SChris Mason { 10540999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 10550999df54SChris Mason struct extent_buffer *eb; 10560999df54SChris Mason eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 1057f09d1f60SDavid Sterba bytenr, blocksize); 10580999df54SChris Mason return eb; 10590999df54SChris Mason } 10600999df54SChris Mason 10610999df54SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 10620999df54SChris Mason u64 bytenr, u32 blocksize) 10630999df54SChris Mason { 10640999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 10650999df54SChris Mason struct extent_buffer *eb; 10660999df54SChris Mason 10670999df54SChris Mason eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 1068ba144192SDavid Sterba bytenr, blocksize, NULL); 10690999df54SChris Mason return eb; 10700999df54SChris Mason } 10710999df54SChris Mason 10720999df54SChris Mason 1073e02119d5SChris Mason int btrfs_write_tree_block(struct extent_buffer *buf) 1074e02119d5SChris Mason { 10758aa38c31SChristoph Hellwig return filemap_fdatawrite_range(buf->first_page->mapping, buf->start, 10768aa38c31SChristoph Hellwig buf->start + buf->len - 1); 1077e02119d5SChris Mason } 1078e02119d5SChris Mason 1079e02119d5SChris Mason int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) 1080e02119d5SChris Mason { 10818aa38c31SChristoph Hellwig return filemap_fdatawait_range(buf->first_page->mapping, 10828aa38c31SChristoph Hellwig buf->start, buf->start + buf->len - 1); 1083e02119d5SChris Mason } 1084e02119d5SChris Mason 1085db94535dSChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, 1086ca7a79adSChris Mason u32 blocksize, u64 parent_transid) 1087e20d96d6SChris Mason { 10885f39d397SChris Mason struct extent_buffer *buf = NULL; 108919c00ddcSChris Mason int ret; 109019c00ddcSChris Mason 1091db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 10925f39d397SChris Mason if (!buf) 1093d98237b3SChris Mason return NULL; 1094e4204dedSChris Mason 1095ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 1096ce9adaa5SChris Mason 1097d397712bSChris Mason if (ret == 0) 1098b4ce94deSChris Mason set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); 10995f39d397SChris Mason return buf; 1100ce9adaa5SChris Mason 1101eb60ceacSChris Mason } 1102eb60ceacSChris Mason 1103e089f05cSChris Mason int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, 11045f39d397SChris Mason struct extent_buffer *buf) 1105ed2ff2cbSChris Mason { 11065f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 110755c69072SChris Mason if (btrfs_header_generation(buf) == 1108925baeddSChris Mason root->fs_info->running_transaction->transid) { 1109b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 1110b4ce94deSChris Mason 1111b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { 1112b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 1113b9473439SChris Mason if (root->fs_info->dirty_metadata_bytes >= buf->len) 1114b9473439SChris Mason root->fs_info->dirty_metadata_bytes -= buf->len; 1115b9473439SChris Mason else 1116b9473439SChris Mason WARN_ON(1); 1117b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 1118b9473439SChris Mason } 1119b4ce94deSChris Mason 1120b9473439SChris Mason /* ugh, clear_extent_buffer_dirty needs to lock the page */ 1121b9473439SChris Mason btrfs_set_lock_blocking(buf); 1122d1310b2eSChris Mason clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 112355c69072SChris Mason buf); 1124925baeddSChris Mason } 11255f39d397SChris Mason return 0; 11265f39d397SChris Mason } 11275f39d397SChris Mason 1128db94535dSChris Mason static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 112987ee04ebSChris Mason u32 stripesize, struct btrfs_root *root, 11309f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 1131e20d96d6SChris Mason u64 objectid) 1132d97e63b6SChris Mason { 1133cfaa7295SChris Mason root->node = NULL; 1134a28ec197SChris Mason root->commit_root = NULL; 1135db94535dSChris Mason root->sectorsize = sectorsize; 1136db94535dSChris Mason root->nodesize = nodesize; 1137db94535dSChris Mason root->leafsize = leafsize; 113887ee04ebSChris Mason root->stripesize = stripesize; 1139123abc88SChris Mason root->ref_cows = 0; 11400b86a832SChris Mason root->track_dirty = 0; 1141c71bf099SYan, Zheng root->in_radix = 0; 1142d68fc57bSYan, Zheng root->orphan_item_inserted = 0; 1143d68fc57bSYan, Zheng root->orphan_cleanup_state = 0; 11440b86a832SChris Mason 11459f5fae2fSChris Mason root->fs_info = fs_info; 11460f7d52f4SChris Mason root->objectid = objectid; 11470f7d52f4SChris Mason root->last_trans = 0; 114813a8a7c8SYan, Zheng root->highest_objectid = 0; 114958176a96SJosef Bacik root->name = NULL; 11506bef4d31SEric Paris root->inode_tree = RB_ROOT; 115116cdcec7SMiao Xie INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC); 1152f0486c68SYan, Zheng root->block_rsv = NULL; 1153d68fc57bSYan, Zheng root->orphan_block_rsv = NULL; 11540b86a832SChris Mason 11550b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 11567b128766SJosef Bacik INIT_LIST_HEAD(&root->orphan_list); 11575d4f98a2SYan Zheng INIT_LIST_HEAD(&root->root_list); 1158d68fc57bSYan, Zheng spin_lock_init(&root->orphan_lock); 11595d4f98a2SYan Zheng spin_lock_init(&root->inode_lock); 1160f0486c68SYan, Zheng spin_lock_init(&root->accounting_lock); 1161a2135011SChris Mason mutex_init(&root->objectid_mutex); 1162e02119d5SChris Mason mutex_init(&root->log_mutex); 11637237f183SYan Zheng init_waitqueue_head(&root->log_writer_wait); 11647237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[0]); 11657237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[1]); 11667237f183SYan Zheng atomic_set(&root->log_commit[0], 0); 11677237f183SYan Zheng atomic_set(&root->log_commit[1], 0); 11687237f183SYan Zheng atomic_set(&root->log_writers, 0); 11697237f183SYan Zheng root->log_batch = 0; 11707237f183SYan Zheng root->log_transid = 0; 1171257c62e1SChris Mason root->last_log_commit = 0; 1172d0c803c4SChris Mason extent_io_tree_init(&root->dirty_log_pages, 1173f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 1174017e5369SChris Mason 11753768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 11763768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 11776702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 117858176a96SJosef Bacik memset(&root->root_kobj, 0, sizeof(root->root_kobj)); 11793f157a2fSChris Mason root->defrag_trans_start = fs_info->generation; 118058176a96SJosef Bacik init_completion(&root->kobj_unregister); 11816702ed49SChris Mason root->defrag_running = 0; 11824d775673SChris Mason root->root_key.objectid = objectid; 11830ee5dc67SAl Viro root->anon_dev = 0; 11843768f368SChris Mason return 0; 11853768f368SChris Mason } 11863768f368SChris Mason 1187db94535dSChris Mason static int find_and_setup_root(struct btrfs_root *tree_root, 11889f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 11899f5fae2fSChris Mason u64 objectid, 1190e20d96d6SChris Mason struct btrfs_root *root) 11913768f368SChris Mason { 11923768f368SChris Mason int ret; 1193db94535dSChris Mason u32 blocksize; 119484234f3aSYan Zheng u64 generation; 11953768f368SChris Mason 1196db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 119787ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 119887ee04ebSChris Mason root, fs_info, objectid); 11993768f368SChris Mason ret = btrfs_find_last_root(tree_root, objectid, 12003768f368SChris Mason &root->root_item, &root->root_key); 12014df27c4dSYan, Zheng if (ret > 0) 12024df27c4dSYan, Zheng return -ENOENT; 12033768f368SChris Mason BUG_ON(ret); 12043768f368SChris Mason 120584234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1206db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 1207af31f5e5SChris Mason root->commit_root = NULL; 1208db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 120984234f3aSYan Zheng blocksize, generation); 121068433b73SChris Mason if (!root->node || !btrfs_buffer_uptodate(root->node, generation)) { 121168433b73SChris Mason free_extent_buffer(root->node); 1212af31f5e5SChris Mason root->node = NULL; 121368433b73SChris Mason return -EIO; 121468433b73SChris Mason } 12154df27c4dSYan, Zheng root->commit_root = btrfs_root_node(root); 1216d97e63b6SChris Mason return 0; 1217d97e63b6SChris Mason } 1218d97e63b6SChris Mason 12197237f183SYan Zheng static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, 1220e02119d5SChris Mason struct btrfs_fs_info *fs_info) 12210f7d52f4SChris Mason { 12220f7d52f4SChris Mason struct btrfs_root *root; 12230f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 12247237f183SYan Zheng struct extent_buffer *leaf; 1225e02119d5SChris Mason 1226e02119d5SChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 1227e02119d5SChris Mason if (!root) 12287237f183SYan Zheng return ERR_PTR(-ENOMEM); 1229e02119d5SChris Mason 1230e02119d5SChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 1231e02119d5SChris Mason tree_root->sectorsize, tree_root->stripesize, 1232e02119d5SChris Mason root, fs_info, BTRFS_TREE_LOG_OBJECTID); 1233e02119d5SChris Mason 1234e02119d5SChris Mason root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; 1235e02119d5SChris Mason root->root_key.type = BTRFS_ROOT_ITEM_KEY; 1236e02119d5SChris Mason root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; 12377237f183SYan Zheng /* 12387237f183SYan Zheng * log trees do not get reference counted because they go away 12397237f183SYan Zheng * before a real commit is actually done. They do store pointers 12407237f183SYan Zheng * to file data extents, and those reference counts still get 12417237f183SYan Zheng * updated (along with back refs to the log tree). 12427237f183SYan Zheng */ 1243e02119d5SChris Mason root->ref_cows = 0; 1244e02119d5SChris Mason 12455d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 12465d4f98a2SYan Zheng BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0); 12477237f183SYan Zheng if (IS_ERR(leaf)) { 12487237f183SYan Zheng kfree(root); 12497237f183SYan Zheng return ERR_CAST(leaf); 12507237f183SYan Zheng } 1251e02119d5SChris Mason 12525d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 12535d4f98a2SYan Zheng btrfs_set_header_bytenr(leaf, leaf->start); 12545d4f98a2SYan Zheng btrfs_set_header_generation(leaf, trans->transid); 12555d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 12565d4f98a2SYan Zheng btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); 12577237f183SYan Zheng root->node = leaf; 1258e02119d5SChris Mason 1259e02119d5SChris Mason write_extent_buffer(root->node, root->fs_info->fsid, 1260e02119d5SChris Mason (unsigned long)btrfs_header_fsid(root->node), 1261e02119d5SChris Mason BTRFS_FSID_SIZE); 1262e02119d5SChris Mason btrfs_mark_buffer_dirty(root->node); 1263e02119d5SChris Mason btrfs_tree_unlock(root->node); 12647237f183SYan Zheng return root; 12657237f183SYan Zheng } 12667237f183SYan Zheng 12677237f183SYan Zheng int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 12687237f183SYan Zheng struct btrfs_fs_info *fs_info) 12697237f183SYan Zheng { 12707237f183SYan Zheng struct btrfs_root *log_root; 12717237f183SYan Zheng 12727237f183SYan Zheng log_root = alloc_log_tree(trans, fs_info); 12737237f183SYan Zheng if (IS_ERR(log_root)) 12747237f183SYan Zheng return PTR_ERR(log_root); 12757237f183SYan Zheng WARN_ON(fs_info->log_root_tree); 12767237f183SYan Zheng fs_info->log_root_tree = log_root; 12777237f183SYan Zheng return 0; 12787237f183SYan Zheng } 12797237f183SYan Zheng 12807237f183SYan Zheng int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 12817237f183SYan Zheng struct btrfs_root *root) 12827237f183SYan Zheng { 12837237f183SYan Zheng struct btrfs_root *log_root; 12847237f183SYan Zheng struct btrfs_inode_item *inode_item; 12857237f183SYan Zheng 12867237f183SYan Zheng log_root = alloc_log_tree(trans, root->fs_info); 12877237f183SYan Zheng if (IS_ERR(log_root)) 12887237f183SYan Zheng return PTR_ERR(log_root); 12897237f183SYan Zheng 12907237f183SYan Zheng log_root->last_trans = trans->transid; 12917237f183SYan Zheng log_root->root_key.offset = root->root_key.objectid; 12927237f183SYan Zheng 12937237f183SYan Zheng inode_item = &log_root->root_item.inode; 12947237f183SYan Zheng inode_item->generation = cpu_to_le64(1); 12957237f183SYan Zheng inode_item->size = cpu_to_le64(3); 12967237f183SYan Zheng inode_item->nlink = cpu_to_le32(1); 12977237f183SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 12987237f183SYan Zheng inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 12997237f183SYan Zheng 13005d4f98a2SYan Zheng btrfs_set_root_node(&log_root->root_item, log_root->node); 13017237f183SYan Zheng 13027237f183SYan Zheng WARN_ON(root->log_root); 13037237f183SYan Zheng root->log_root = log_root; 13047237f183SYan Zheng root->log_transid = 0; 1305257c62e1SChris Mason root->last_log_commit = 0; 1306e02119d5SChris Mason return 0; 1307e02119d5SChris Mason } 1308e02119d5SChris Mason 1309e02119d5SChris Mason struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, 1310e02119d5SChris Mason struct btrfs_key *location) 1311e02119d5SChris Mason { 1312e02119d5SChris Mason struct btrfs_root *root; 1313e02119d5SChris Mason struct btrfs_fs_info *fs_info = tree_root->fs_info; 13140f7d52f4SChris Mason struct btrfs_path *path; 13155f39d397SChris Mason struct extent_buffer *l; 131684234f3aSYan Zheng u64 generation; 1317db94535dSChris Mason u32 blocksize; 13180f7d52f4SChris Mason int ret = 0; 13190f7d52f4SChris Mason 13205eda7b5eSChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 13210cf6c620SChris Mason if (!root) 13220f7d52f4SChris Mason return ERR_PTR(-ENOMEM); 13230f7d52f4SChris Mason if (location->offset == (u64)-1) { 1324db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 13250f7d52f4SChris Mason location->objectid, root); 13260f7d52f4SChris Mason if (ret) { 13270f7d52f4SChris Mason kfree(root); 13280f7d52f4SChris Mason return ERR_PTR(ret); 13290f7d52f4SChris Mason } 133013a8a7c8SYan, Zheng goto out; 13310f7d52f4SChris Mason } 13320f7d52f4SChris Mason 1333db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 133487ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 133587ee04ebSChris Mason root, fs_info, location->objectid); 13360f7d52f4SChris Mason 13370f7d52f4SChris Mason path = btrfs_alloc_path(); 1338db5b493aSTsutomu Itoh if (!path) { 1339db5b493aSTsutomu Itoh kfree(root); 1340db5b493aSTsutomu Itoh return ERR_PTR(-ENOMEM); 1341db5b493aSTsutomu Itoh } 13420f7d52f4SChris Mason ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); 134313a8a7c8SYan, Zheng if (ret == 0) { 13445f39d397SChris Mason l = path->nodes[0]; 13455f39d397SChris Mason read_extent_buffer(l, &root->root_item, 13465f39d397SChris Mason btrfs_item_ptr_offset(l, path->slots[0]), 13470f7d52f4SChris Mason sizeof(root->root_item)); 134844b36eb2SYan Zheng memcpy(&root->root_key, location, sizeof(*location)); 134913a8a7c8SYan, Zheng } 13500f7d52f4SChris Mason btrfs_free_path(path); 13510f7d52f4SChris Mason if (ret) { 13525e540f77STsutomu Itoh kfree(root); 135313a8a7c8SYan, Zheng if (ret > 0) 135413a8a7c8SYan, Zheng ret = -ENOENT; 13550f7d52f4SChris Mason return ERR_PTR(ret); 13560f7d52f4SChris Mason } 135713a8a7c8SYan, Zheng 135884234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1359db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 1360db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 136184234f3aSYan Zheng blocksize, generation); 13625d4f98a2SYan Zheng root->commit_root = btrfs_root_node(root); 13630f7d52f4SChris Mason BUG_ON(!root->node); 136413a8a7c8SYan, Zheng out: 136508fe4db1SLi Zefan if (location->objectid != BTRFS_TREE_LOG_OBJECTID) { 13660f7d52f4SChris Mason root->ref_cows = 1; 136708fe4db1SLi Zefan btrfs_check_and_init_root_item(&root->root_item); 136808fe4db1SLi Zefan } 136913a8a7c8SYan, Zheng 13705eda7b5eSChris Mason return root; 13715eda7b5eSChris Mason } 13725eda7b5eSChris Mason 1373edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 1374edbd8d4eSChris Mason struct btrfs_key *location) 13755eda7b5eSChris Mason { 13765eda7b5eSChris Mason struct btrfs_root *root; 13775eda7b5eSChris Mason int ret; 13785eda7b5eSChris Mason 1379edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 1380edbd8d4eSChris Mason return fs_info->tree_root; 1381edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 1382edbd8d4eSChris Mason return fs_info->extent_root; 13838f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 13848f18cf13SChris Mason return fs_info->chunk_root; 13858f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 13868f18cf13SChris Mason return fs_info->dev_root; 13870403e47eSYan Zheng if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) 13880403e47eSYan Zheng return fs_info->csum_root; 13894df27c4dSYan, Zheng again: 13904df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 13915eda7b5eSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 13925eda7b5eSChris Mason (unsigned long)location->objectid); 13934df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 13945eda7b5eSChris Mason if (root) 13955eda7b5eSChris Mason return root; 13965eda7b5eSChris Mason 1397e02119d5SChris Mason root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); 13985eda7b5eSChris Mason if (IS_ERR(root)) 13995eda7b5eSChris Mason return root; 14003394e160SChris Mason 1401581bb050SLi Zefan root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS); 1402581bb050SLi Zefan root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned), 1403581bb050SLi Zefan GFP_NOFS); 140435a30d7cSDavid Sterba if (!root->free_ino_pinned || !root->free_ino_ctl) { 140535a30d7cSDavid Sterba ret = -ENOMEM; 1406581bb050SLi Zefan goto fail; 140735a30d7cSDavid Sterba } 1408581bb050SLi Zefan 1409581bb050SLi Zefan btrfs_init_free_ino_ctl(root); 1410581bb050SLi Zefan mutex_init(&root->fs_commit_mutex); 1411581bb050SLi Zefan spin_lock_init(&root->cache_lock); 1412581bb050SLi Zefan init_waitqueue_head(&root->cache_wait); 1413581bb050SLi Zefan 14140ee5dc67SAl Viro ret = get_anon_bdev(&root->anon_dev); 1415ac08aedfSChris Mason if (ret) 1416ac08aedfSChris Mason goto fail; 14173394e160SChris Mason 1418d68fc57bSYan, Zheng if (btrfs_root_refs(&root->root_item) == 0) { 1419d68fc57bSYan, Zheng ret = -ENOENT; 1420d68fc57bSYan, Zheng goto fail; 1421d68fc57bSYan, Zheng } 1422d68fc57bSYan, Zheng 1423d68fc57bSYan, Zheng ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid); 1424d68fc57bSYan, Zheng if (ret < 0) 1425d68fc57bSYan, Zheng goto fail; 1426d68fc57bSYan, Zheng if (ret == 0) 1427d68fc57bSYan, Zheng root->orphan_item_inserted = 1; 1428d68fc57bSYan, Zheng 14294df27c4dSYan, Zheng ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); 14304df27c4dSYan, Zheng if (ret) 14314df27c4dSYan, Zheng goto fail; 14324df27c4dSYan, Zheng 14334df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 14342619ba1fSChris Mason ret = radix_tree_insert(&fs_info->fs_roots_radix, 14352619ba1fSChris Mason (unsigned long)root->root_key.objectid, 14360f7d52f4SChris Mason root); 1437d68fc57bSYan, Zheng if (ret == 0) 14384df27c4dSYan, Zheng root->in_radix = 1; 1439d68fc57bSYan, Zheng 14404df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 14414df27c4dSYan, Zheng radix_tree_preload_end(); 14420f7d52f4SChris Mason if (ret) { 14434df27c4dSYan, Zheng if (ret == -EEXIST) { 14444df27c4dSYan, Zheng free_fs_root(root); 14454df27c4dSYan, Zheng goto again; 14460f7d52f4SChris Mason } 14474df27c4dSYan, Zheng goto fail; 14484df27c4dSYan, Zheng } 14494df27c4dSYan, Zheng 1450edbd8d4eSChris Mason ret = btrfs_find_dead_roots(fs_info->tree_root, 14515d4f98a2SYan Zheng root->root_key.objectid); 14524df27c4dSYan, Zheng WARN_ON(ret); 1453edbd8d4eSChris Mason return root; 14544df27c4dSYan, Zheng fail: 14554df27c4dSYan, Zheng free_fs_root(root); 14564df27c4dSYan, Zheng return ERR_PTR(ret); 1457edbd8d4eSChris Mason } 1458edbd8d4eSChris Mason 145904160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 146004160088SChris Mason { 146104160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 146204160088SChris Mason int ret = 0; 146304160088SChris Mason struct btrfs_device *device; 146404160088SChris Mason struct backing_dev_info *bdi; 1465b7967db7SChris Mason 14661f78160cSXiao Guangrong rcu_read_lock(); 14671f78160cSXiao Guangrong list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) { 1468dfe25020SChris Mason if (!device->bdev) 1469dfe25020SChris Mason continue; 147004160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 147104160088SChris Mason if (bdi && bdi_congested(bdi, bdi_bits)) { 147204160088SChris Mason ret = 1; 147304160088SChris Mason break; 147404160088SChris Mason } 147504160088SChris Mason } 14761f78160cSXiao Guangrong rcu_read_unlock(); 147704160088SChris Mason return ret; 147804160088SChris Mason } 147904160088SChris Mason 148038b66988SChris Mason /* 1481ad081f14SJens Axboe * If this fails, caller must call bdi_destroy() to get rid of the 1482ad081f14SJens Axboe * bdi again. 1483ad081f14SJens Axboe */ 148404160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 148504160088SChris Mason { 1486ad081f14SJens Axboe int err; 1487ad081f14SJens Axboe 1488ad081f14SJens Axboe bdi->capabilities = BDI_CAP_MAP_COPY; 1489e6d086d8SJens Axboe err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY); 1490ad081f14SJens Axboe if (err) 1491ad081f14SJens Axboe return err; 1492ad081f14SJens Axboe 14934575c9ccSChris Mason bdi->ra_pages = default_backing_dev_info.ra_pages; 149404160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 149504160088SChris Mason bdi->congested_data = info; 149604160088SChris Mason return 0; 149704160088SChris Mason } 149804160088SChris Mason 1499ce9adaa5SChris Mason static int bio_ready_for_csum(struct bio *bio) 1500ce9adaa5SChris Mason { 1501ce9adaa5SChris Mason u64 length = 0; 1502ce9adaa5SChris Mason u64 buf_len = 0; 1503ce9adaa5SChris Mason u64 start = 0; 1504ce9adaa5SChris Mason struct page *page; 1505ce9adaa5SChris Mason struct extent_io_tree *io_tree = NULL; 1506ce9adaa5SChris Mason struct bio_vec *bvec; 1507ce9adaa5SChris Mason int i; 1508ce9adaa5SChris Mason int ret; 1509ce9adaa5SChris Mason 1510ce9adaa5SChris Mason bio_for_each_segment(bvec, bio, i) { 1511ce9adaa5SChris Mason page = bvec->bv_page; 1512ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 1513ce9adaa5SChris Mason length += bvec->bv_len; 1514ce9adaa5SChris Mason continue; 1515ce9adaa5SChris Mason } 1516ce9adaa5SChris Mason if (!page->private) { 1517ce9adaa5SChris Mason length += bvec->bv_len; 1518ce9adaa5SChris Mason continue; 1519ce9adaa5SChris Mason } 1520ce9adaa5SChris Mason length = bvec->bv_len; 1521ce9adaa5SChris Mason buf_len = page->private >> 2; 1522ce9adaa5SChris Mason start = page_offset(page) + bvec->bv_offset; 1523ce9adaa5SChris Mason io_tree = &BTRFS_I(page->mapping->host)->io_tree; 1524ce9adaa5SChris Mason } 1525ce9adaa5SChris Mason /* are we fully contained in this bio? */ 1526ce9adaa5SChris Mason if (buf_len <= length) 1527ce9adaa5SChris Mason return 1; 1528ce9adaa5SChris Mason 1529ce9adaa5SChris Mason ret = extent_range_uptodate(io_tree, start + length, 1530ce9adaa5SChris Mason start + buf_len - 1); 1531ce9adaa5SChris Mason return ret; 1532ce9adaa5SChris Mason } 1533ce9adaa5SChris Mason 15348b712842SChris Mason /* 15358b712842SChris Mason * called by the kthread helper functions to finally call the bio end_io 15368b712842SChris Mason * functions. This is where read checksum verification actually happens 15378b712842SChris Mason */ 15388b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work) 1539ce9adaa5SChris Mason { 1540ce9adaa5SChris Mason struct bio *bio; 15418b712842SChris Mason struct end_io_wq *end_io_wq; 15428b712842SChris Mason struct btrfs_fs_info *fs_info; 1543ce9adaa5SChris Mason int error; 1544ce9adaa5SChris Mason 15458b712842SChris Mason end_io_wq = container_of(work, struct end_io_wq, work); 1546ce9adaa5SChris Mason bio = end_io_wq->bio; 15478b712842SChris Mason fs_info = end_io_wq->info; 15488b712842SChris Mason 1549cad321adSChris Mason /* metadata bio reads are special because the whole tree block must 15508b712842SChris Mason * be checksummed at once. This makes sure the entire block is in 15518b712842SChris Mason * ram and up to date before trying to verify things. For 15528b712842SChris Mason * blocksize <= pagesize, it is basically a noop 15538b712842SChris Mason */ 15547b6d91daSChristoph Hellwig if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata && 1555cad321adSChris Mason !bio_ready_for_csum(bio)) { 1556d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_meta_workers, 15578b712842SChris Mason &end_io_wq->work); 1558ce9adaa5SChris Mason return; 1559ce9adaa5SChris Mason } 1560ce9adaa5SChris Mason error = end_io_wq->error; 1561ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1562ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 1563ce9adaa5SChris Mason kfree(end_io_wq); 1564ce9adaa5SChris Mason bio_endio(bio, error); 1565ce9adaa5SChris Mason } 156644b8bd7eSChris Mason 1567a74a4b97SChris Mason static int cleaner_kthread(void *arg) 1568a74a4b97SChris Mason { 1569a74a4b97SChris Mason struct btrfs_root *root = arg; 1570a74a4b97SChris Mason 1571a74a4b97SChris Mason do { 1572a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 157376dda93cSYan, Zheng 157476dda93cSYan, Zheng if (!(root->fs_info->sb->s_flags & MS_RDONLY) && 157576dda93cSYan, Zheng mutex_trylock(&root->fs_info->cleaner_mutex)) { 157624bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 1577a74a4b97SChris Mason btrfs_clean_old_snapshots(root); 1578a74a4b97SChris Mason mutex_unlock(&root->fs_info->cleaner_mutex); 15794cb5300bSChris Mason btrfs_run_defrag_inodes(root->fs_info); 158076dda93cSYan, Zheng } 1581a74a4b97SChris Mason 1582a74a4b97SChris Mason if (freezing(current)) { 1583a74a4b97SChris Mason refrigerator(); 1584a74a4b97SChris Mason } else { 1585a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 15868929ecfaSYan, Zheng if (!kthread_should_stop()) 1587a74a4b97SChris Mason schedule(); 1588a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1589a74a4b97SChris Mason } 1590a74a4b97SChris Mason } while (!kthread_should_stop()); 1591a74a4b97SChris Mason return 0; 1592a74a4b97SChris Mason } 1593a74a4b97SChris Mason 1594a74a4b97SChris Mason static int transaction_kthread(void *arg) 1595a74a4b97SChris Mason { 1596a74a4b97SChris Mason struct btrfs_root *root = arg; 1597a74a4b97SChris Mason struct btrfs_trans_handle *trans; 1598a74a4b97SChris Mason struct btrfs_transaction *cur; 15998929ecfaSYan, Zheng u64 transid; 1600a74a4b97SChris Mason unsigned long now; 1601a74a4b97SChris Mason unsigned long delay; 1602a74a4b97SChris Mason int ret; 1603a74a4b97SChris Mason 1604a74a4b97SChris Mason do { 1605a74a4b97SChris Mason delay = HZ * 30; 1606a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 1607a74a4b97SChris Mason mutex_lock(&root->fs_info->transaction_kthread_mutex); 1608a74a4b97SChris Mason 1609a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1610a74a4b97SChris Mason cur = root->fs_info->running_transaction; 1611a74a4b97SChris Mason if (!cur) { 1612a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1613a74a4b97SChris Mason goto sleep; 1614a74a4b97SChris Mason } 161531153d81SYan Zheng 1616a74a4b97SChris Mason now = get_seconds(); 16178929ecfaSYan, Zheng if (!cur->blocked && 16188929ecfaSYan, Zheng (now < cur->start_time || now - cur->start_time < 30)) { 1619a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1620a74a4b97SChris Mason delay = HZ * 5; 1621a74a4b97SChris Mason goto sleep; 1622a74a4b97SChris Mason } 16238929ecfaSYan, Zheng transid = cur->transid; 1624a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 162556bec294SChris Mason 16267a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 16273612b495STsutomu Itoh BUG_ON(IS_ERR(trans)); 16288929ecfaSYan, Zheng if (transid == trans->transid) { 16298929ecfaSYan, Zheng ret = btrfs_commit_transaction(trans, root); 16308929ecfaSYan, Zheng BUG_ON(ret); 16318929ecfaSYan, Zheng } else { 16328929ecfaSYan, Zheng btrfs_end_transaction(trans, root); 16338929ecfaSYan, Zheng } 1634a74a4b97SChris Mason sleep: 1635a74a4b97SChris Mason wake_up_process(root->fs_info->cleaner_kthread); 1636a74a4b97SChris Mason mutex_unlock(&root->fs_info->transaction_kthread_mutex); 1637a74a4b97SChris Mason 1638a74a4b97SChris Mason if (freezing(current)) { 1639a74a4b97SChris Mason refrigerator(); 1640a74a4b97SChris Mason } else { 1641a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 16428929ecfaSYan, Zheng if (!kthread_should_stop() && 16438929ecfaSYan, Zheng !btrfs_transaction_blocked(root->fs_info)) 1644a74a4b97SChris Mason schedule_timeout(delay); 1645a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1646a74a4b97SChris Mason } 1647a74a4b97SChris Mason } while (!kthread_should_stop()); 1648a74a4b97SChris Mason return 0; 1649a74a4b97SChris Mason } 1650a74a4b97SChris Mason 1651af31f5e5SChris Mason /* 1652af31f5e5SChris Mason * this will find the highest generation in the array of 1653af31f5e5SChris Mason * root backups. The index of the highest array is returned, 1654af31f5e5SChris Mason * or -1 if we can't find anything. 1655af31f5e5SChris Mason * 1656af31f5e5SChris Mason * We check to make sure the array is valid by comparing the 1657af31f5e5SChris Mason * generation of the latest root in the array with the generation 1658af31f5e5SChris Mason * in the super block. If they don't match we pitch it. 1659af31f5e5SChris Mason */ 1660af31f5e5SChris Mason static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen) 1661af31f5e5SChris Mason { 1662af31f5e5SChris Mason u64 cur; 1663af31f5e5SChris Mason int newest_index = -1; 1664af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1665af31f5e5SChris Mason int i; 1666af31f5e5SChris Mason 1667af31f5e5SChris Mason for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { 1668af31f5e5SChris Mason root_backup = info->super_copy->super_roots + i; 1669af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1670af31f5e5SChris Mason if (cur == newest_gen) 1671af31f5e5SChris Mason newest_index = i; 1672af31f5e5SChris Mason } 1673af31f5e5SChris Mason 1674af31f5e5SChris Mason /* check to see if we actually wrapped around */ 1675af31f5e5SChris Mason if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) { 1676af31f5e5SChris Mason root_backup = info->super_copy->super_roots; 1677af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1678af31f5e5SChris Mason if (cur == newest_gen) 1679af31f5e5SChris Mason newest_index = 0; 1680af31f5e5SChris Mason } 1681af31f5e5SChris Mason return newest_index; 1682af31f5e5SChris Mason } 1683af31f5e5SChris Mason 1684af31f5e5SChris Mason 1685af31f5e5SChris Mason /* 1686af31f5e5SChris Mason * find the oldest backup so we know where to store new entries 1687af31f5e5SChris Mason * in the backup array. This will set the backup_root_index 1688af31f5e5SChris Mason * field in the fs_info struct 1689af31f5e5SChris Mason */ 1690af31f5e5SChris Mason static void find_oldest_super_backup(struct btrfs_fs_info *info, 1691af31f5e5SChris Mason u64 newest_gen) 1692af31f5e5SChris Mason { 1693af31f5e5SChris Mason int newest_index = -1; 1694af31f5e5SChris Mason 1695af31f5e5SChris Mason newest_index = find_newest_super_backup(info, newest_gen); 1696af31f5e5SChris Mason /* if there was garbage in there, just move along */ 1697af31f5e5SChris Mason if (newest_index == -1) { 1698af31f5e5SChris Mason info->backup_root_index = 0; 1699af31f5e5SChris Mason } else { 1700af31f5e5SChris Mason info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS; 1701af31f5e5SChris Mason } 1702af31f5e5SChris Mason } 1703af31f5e5SChris Mason 1704af31f5e5SChris Mason /* 1705af31f5e5SChris Mason * copy all the root pointers into the super backup array. 1706af31f5e5SChris Mason * this will bump the backup pointer by one when it is 1707af31f5e5SChris Mason * done 1708af31f5e5SChris Mason */ 1709af31f5e5SChris Mason static void backup_super_roots(struct btrfs_fs_info *info) 1710af31f5e5SChris Mason { 1711af31f5e5SChris Mason int next_backup; 1712af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1713af31f5e5SChris Mason int last_backup; 1714af31f5e5SChris Mason 1715af31f5e5SChris Mason next_backup = info->backup_root_index; 1716af31f5e5SChris Mason last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) % 1717af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 1718af31f5e5SChris Mason 1719af31f5e5SChris Mason /* 1720af31f5e5SChris Mason * just overwrite the last backup if we're at the same generation 1721af31f5e5SChris Mason * this happens only at umount 1722af31f5e5SChris Mason */ 1723af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + last_backup; 1724af31f5e5SChris Mason if (btrfs_backup_tree_root_gen(root_backup) == 1725af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)) 1726af31f5e5SChris Mason next_backup = last_backup; 1727af31f5e5SChris Mason 1728af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + next_backup; 1729af31f5e5SChris Mason 1730af31f5e5SChris Mason /* 1731af31f5e5SChris Mason * make sure all of our padding and empty slots get zero filled 1732af31f5e5SChris Mason * regardless of which ones we use today 1733af31f5e5SChris Mason */ 1734af31f5e5SChris Mason memset(root_backup, 0, sizeof(*root_backup)); 1735af31f5e5SChris Mason 1736af31f5e5SChris Mason info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS; 1737af31f5e5SChris Mason 1738af31f5e5SChris Mason btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start); 1739af31f5e5SChris Mason btrfs_set_backup_tree_root_gen(root_backup, 1740af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)); 1741af31f5e5SChris Mason 1742af31f5e5SChris Mason btrfs_set_backup_tree_root_level(root_backup, 1743af31f5e5SChris Mason btrfs_header_level(info->tree_root->node)); 1744af31f5e5SChris Mason 1745af31f5e5SChris Mason btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start); 1746af31f5e5SChris Mason btrfs_set_backup_chunk_root_gen(root_backup, 1747af31f5e5SChris Mason btrfs_header_generation(info->chunk_root->node)); 1748af31f5e5SChris Mason btrfs_set_backup_chunk_root_level(root_backup, 1749af31f5e5SChris Mason btrfs_header_level(info->chunk_root->node)); 1750af31f5e5SChris Mason 1751af31f5e5SChris Mason btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start); 1752af31f5e5SChris Mason btrfs_set_backup_extent_root_gen(root_backup, 1753af31f5e5SChris Mason btrfs_header_generation(info->extent_root->node)); 1754af31f5e5SChris Mason btrfs_set_backup_extent_root_level(root_backup, 1755af31f5e5SChris Mason btrfs_header_level(info->extent_root->node)); 1756af31f5e5SChris Mason 17577c7e82a7SChris Mason /* 17587c7e82a7SChris Mason * we might commit during log recovery, which happens before we set 17597c7e82a7SChris Mason * the fs_root. Make sure it is valid before we fill it in. 17607c7e82a7SChris Mason */ 17617c7e82a7SChris Mason if (info->fs_root && info->fs_root->node) { 17627c7e82a7SChris Mason btrfs_set_backup_fs_root(root_backup, 17637c7e82a7SChris Mason info->fs_root->node->start); 1764af31f5e5SChris Mason btrfs_set_backup_fs_root_gen(root_backup, 1765af31f5e5SChris Mason btrfs_header_generation(info->fs_root->node)); 1766af31f5e5SChris Mason btrfs_set_backup_fs_root_level(root_backup, 1767af31f5e5SChris Mason btrfs_header_level(info->fs_root->node)); 17687c7e82a7SChris Mason } 1769af31f5e5SChris Mason 1770af31f5e5SChris Mason btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start); 1771af31f5e5SChris Mason btrfs_set_backup_dev_root_gen(root_backup, 1772af31f5e5SChris Mason btrfs_header_generation(info->dev_root->node)); 1773af31f5e5SChris Mason btrfs_set_backup_dev_root_level(root_backup, 1774af31f5e5SChris Mason btrfs_header_level(info->dev_root->node)); 1775af31f5e5SChris Mason 1776af31f5e5SChris Mason btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start); 1777af31f5e5SChris Mason btrfs_set_backup_csum_root_gen(root_backup, 1778af31f5e5SChris Mason btrfs_header_generation(info->csum_root->node)); 1779af31f5e5SChris Mason btrfs_set_backup_csum_root_level(root_backup, 1780af31f5e5SChris Mason btrfs_header_level(info->csum_root->node)); 1781af31f5e5SChris Mason 1782af31f5e5SChris Mason btrfs_set_backup_total_bytes(root_backup, 1783af31f5e5SChris Mason btrfs_super_total_bytes(info->super_copy)); 1784af31f5e5SChris Mason btrfs_set_backup_bytes_used(root_backup, 1785af31f5e5SChris Mason btrfs_super_bytes_used(info->super_copy)); 1786af31f5e5SChris Mason btrfs_set_backup_num_devices(root_backup, 1787af31f5e5SChris Mason btrfs_super_num_devices(info->super_copy)); 1788af31f5e5SChris Mason 1789af31f5e5SChris Mason /* 1790af31f5e5SChris Mason * if we don't copy this out to the super_copy, it won't get remembered 1791af31f5e5SChris Mason * for the next commit 1792af31f5e5SChris Mason */ 1793af31f5e5SChris Mason memcpy(&info->super_copy->super_roots, 1794af31f5e5SChris Mason &info->super_for_commit->super_roots, 1795af31f5e5SChris Mason sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS); 1796af31f5e5SChris Mason } 1797af31f5e5SChris Mason 1798af31f5e5SChris Mason /* 1799af31f5e5SChris Mason * this copies info out of the root backup array and back into 1800af31f5e5SChris Mason * the in-memory super block. It is meant to help iterate through 1801af31f5e5SChris Mason * the array, so you send it the number of backups you've already 1802af31f5e5SChris Mason * tried and the last backup index you used. 1803af31f5e5SChris Mason * 1804af31f5e5SChris Mason * this returns -1 when it has tried all the backups 1805af31f5e5SChris Mason */ 1806af31f5e5SChris Mason static noinline int next_root_backup(struct btrfs_fs_info *info, 1807af31f5e5SChris Mason struct btrfs_super_block *super, 1808af31f5e5SChris Mason int *num_backups_tried, int *backup_index) 1809af31f5e5SChris Mason { 1810af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1811af31f5e5SChris Mason int newest = *backup_index; 1812af31f5e5SChris Mason 1813af31f5e5SChris Mason if (*num_backups_tried == 0) { 1814af31f5e5SChris Mason u64 gen = btrfs_super_generation(super); 1815af31f5e5SChris Mason 1816af31f5e5SChris Mason newest = find_newest_super_backup(info, gen); 1817af31f5e5SChris Mason if (newest == -1) 1818af31f5e5SChris Mason return -1; 1819af31f5e5SChris Mason 1820af31f5e5SChris Mason *backup_index = newest; 1821af31f5e5SChris Mason *num_backups_tried = 1; 1822af31f5e5SChris Mason } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) { 1823af31f5e5SChris Mason /* we've tried all the backups, all done */ 1824af31f5e5SChris Mason return -1; 1825af31f5e5SChris Mason } else { 1826af31f5e5SChris Mason /* jump to the next oldest backup */ 1827af31f5e5SChris Mason newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) % 1828af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 1829af31f5e5SChris Mason *backup_index = newest; 1830af31f5e5SChris Mason *num_backups_tried += 1; 1831af31f5e5SChris Mason } 1832af31f5e5SChris Mason root_backup = super->super_roots + newest; 1833af31f5e5SChris Mason 1834af31f5e5SChris Mason btrfs_set_super_generation(super, 1835af31f5e5SChris Mason btrfs_backup_tree_root_gen(root_backup)); 1836af31f5e5SChris Mason btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup)); 1837af31f5e5SChris Mason btrfs_set_super_root_level(super, 1838af31f5e5SChris Mason btrfs_backup_tree_root_level(root_backup)); 1839af31f5e5SChris Mason btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup)); 1840af31f5e5SChris Mason 1841af31f5e5SChris Mason /* 1842af31f5e5SChris Mason * fixme: the total bytes and num_devices need to match or we should 1843af31f5e5SChris Mason * need a fsck 1844af31f5e5SChris Mason */ 1845af31f5e5SChris Mason btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup)); 1846af31f5e5SChris Mason btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup)); 1847af31f5e5SChris Mason return 0; 1848af31f5e5SChris Mason } 1849af31f5e5SChris Mason 1850af31f5e5SChris Mason /* helper to cleanup tree roots */ 1851af31f5e5SChris Mason static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root) 1852af31f5e5SChris Mason { 1853af31f5e5SChris Mason free_extent_buffer(info->tree_root->node); 1854af31f5e5SChris Mason free_extent_buffer(info->tree_root->commit_root); 1855af31f5e5SChris Mason free_extent_buffer(info->dev_root->node); 1856af31f5e5SChris Mason free_extent_buffer(info->dev_root->commit_root); 1857af31f5e5SChris Mason free_extent_buffer(info->extent_root->node); 1858af31f5e5SChris Mason free_extent_buffer(info->extent_root->commit_root); 1859af31f5e5SChris Mason free_extent_buffer(info->csum_root->node); 1860af31f5e5SChris Mason free_extent_buffer(info->csum_root->commit_root); 1861af31f5e5SChris Mason 1862af31f5e5SChris Mason info->tree_root->node = NULL; 1863af31f5e5SChris Mason info->tree_root->commit_root = NULL; 1864af31f5e5SChris Mason info->dev_root->node = NULL; 1865af31f5e5SChris Mason info->dev_root->commit_root = NULL; 1866af31f5e5SChris Mason info->extent_root->node = NULL; 1867af31f5e5SChris Mason info->extent_root->commit_root = NULL; 1868af31f5e5SChris Mason info->csum_root->node = NULL; 1869af31f5e5SChris Mason info->csum_root->commit_root = NULL; 1870af31f5e5SChris Mason 1871af31f5e5SChris Mason if (chunk_root) { 1872af31f5e5SChris Mason free_extent_buffer(info->chunk_root->node); 1873af31f5e5SChris Mason free_extent_buffer(info->chunk_root->commit_root); 1874af31f5e5SChris Mason info->chunk_root->node = NULL; 1875af31f5e5SChris Mason info->chunk_root->commit_root = NULL; 1876af31f5e5SChris Mason } 1877af31f5e5SChris Mason } 1878af31f5e5SChris Mason 1879af31f5e5SChris Mason 18808a4b83ccSChris Mason struct btrfs_root *open_ctree(struct super_block *sb, 1881dfe25020SChris Mason struct btrfs_fs_devices *fs_devices, 1882dfe25020SChris Mason char *options) 1883eb60ceacSChris Mason { 1884db94535dSChris Mason u32 sectorsize; 1885db94535dSChris Mason u32 nodesize; 1886db94535dSChris Mason u32 leafsize; 1887db94535dSChris Mason u32 blocksize; 188887ee04ebSChris Mason u32 stripesize; 188984234f3aSYan Zheng u64 generation; 1890f2b636e8SJosef Bacik u64 features; 18913de4586cSChris Mason struct btrfs_key location; 1892a061fc8dSChris Mason struct buffer_head *bh; 1893e02119d5SChris Mason struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), 1894e20d96d6SChris Mason GFP_NOFS); 1895d20f7043SChris Mason struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root), 1896d20f7043SChris Mason GFP_NOFS); 1897450ba0eaSJosef Bacik struct btrfs_root *tree_root = btrfs_sb(sb); 18984891aca2SDavid Sterba struct btrfs_fs_info *fs_info = NULL; 1899e02119d5SChris Mason struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), 19000b86a832SChris Mason GFP_NOFS); 1901e02119d5SChris Mason struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), 19020b86a832SChris Mason GFP_NOFS); 1903e02119d5SChris Mason struct btrfs_root *log_tree_root; 1904e02119d5SChris Mason 1905eb60ceacSChris Mason int ret; 1906e58ca020SYan int err = -EINVAL; 1907af31f5e5SChris Mason int num_backups_tried = 0; 1908af31f5e5SChris Mason int backup_index = 0; 19094543df7eSChris Mason 19102c90e5d6SChris Mason struct btrfs_super_block *disk_super; 19118790d502SChris Mason 19124891aca2SDavid Sterba if (!extent_root || !tree_root || !tree_root->fs_info || 1913d20f7043SChris Mason !chunk_root || !dev_root || !csum_root) { 191439279cc3SChris Mason err = -ENOMEM; 191539279cc3SChris Mason goto fail; 191639279cc3SChris Mason } 19174891aca2SDavid Sterba fs_info = tree_root->fs_info; 191876dda93cSYan, Zheng 191976dda93cSYan, Zheng ret = init_srcu_struct(&fs_info->subvol_srcu); 192076dda93cSYan, Zheng if (ret) { 192176dda93cSYan, Zheng err = ret; 192276dda93cSYan, Zheng goto fail; 192376dda93cSYan, Zheng } 192476dda93cSYan, Zheng 192576dda93cSYan, Zheng ret = setup_bdi(fs_info, &fs_info->bdi); 192676dda93cSYan, Zheng if (ret) { 192776dda93cSYan, Zheng err = ret; 192876dda93cSYan, Zheng goto fail_srcu; 192976dda93cSYan, Zheng } 193076dda93cSYan, Zheng 193176dda93cSYan, Zheng fs_info->btree_inode = new_inode(sb); 193276dda93cSYan, Zheng if (!fs_info->btree_inode) { 193376dda93cSYan, Zheng err = -ENOMEM; 193476dda93cSYan, Zheng goto fail_bdi; 193576dda93cSYan, Zheng } 193676dda93cSYan, Zheng 1937a6591715SChris Mason mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); 19381561dedaSMiao Xie 193976dda93cSYan, Zheng INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); 19408fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 1941facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 194224bbcf04SYan, Zheng INIT_LIST_HEAD(&fs_info->delayed_iputs); 194319c00ddcSChris Mason INIT_LIST_HEAD(&fs_info->hashers); 1944ea8c2819SChris Mason INIT_LIST_HEAD(&fs_info->delalloc_inodes); 19455a3f23d5SChris Mason INIT_LIST_HEAD(&fs_info->ordered_operations); 194611833d66SYan Zheng INIT_LIST_HEAD(&fs_info->caching_block_groups); 19471832a6d5SChris Mason spin_lock_init(&fs_info->delalloc_lock); 1948a4abeea4SJosef Bacik spin_lock_init(&fs_info->trans_lock); 194931153d81SYan Zheng spin_lock_init(&fs_info->ref_cache_lock); 195076dda93cSYan, Zheng spin_lock_init(&fs_info->fs_roots_radix_lock); 195124bbcf04SYan, Zheng spin_lock_init(&fs_info->delayed_iput_lock); 19524cb5300bSChris Mason spin_lock_init(&fs_info->defrag_inodes_lock); 19532bf64758SJosef Bacik spin_lock_init(&fs_info->free_chunk_lock); 19547585717fSChris Mason mutex_init(&fs_info->reloc_mutex); 195519c00ddcSChris Mason 195658176a96SJosef Bacik init_completion(&fs_info->kobj_unregister); 19579f5fae2fSChris Mason fs_info->tree_root = tree_root; 19589f5fae2fSChris Mason fs_info->extent_root = extent_root; 1959d20f7043SChris Mason fs_info->csum_root = csum_root; 19600b86a832SChris Mason fs_info->chunk_root = chunk_root; 19610b86a832SChris Mason fs_info->dev_root = dev_root; 19628a4b83ccSChris Mason fs_info->fs_devices = fs_devices; 19630b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 19646324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 19650b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 1966f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->global_block_rsv); 1967f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->delalloc_block_rsv); 1968f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->trans_block_rsv); 1969f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->chunk_block_rsv); 1970f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->empty_block_rsv); 19716d668ddaSJosef Bacik btrfs_init_block_rsv(&fs_info->delayed_block_rsv); 1972cb03c743SChris Mason atomic_set(&fs_info->nr_async_submits, 0); 1973771ed689SChris Mason atomic_set(&fs_info->async_delalloc_pages, 0); 19748c8bee1dSChris Mason atomic_set(&fs_info->async_submit_draining, 0); 19750986fe9eSChris Mason atomic_set(&fs_info->nr_async_bios, 0); 19764cb5300bSChris Mason atomic_set(&fs_info->defrag_running, 0); 1977e20d96d6SChris Mason fs_info->sb = sb; 19786f568d35SChris Mason fs_info->max_inline = 8192 * 1024; 19799ed74f2dSJosef Bacik fs_info->metadata_ratio = 0; 19804cb5300bSChris Mason fs_info->defrag_inodes = RB_ROOT; 1981a4abeea4SJosef Bacik fs_info->trans_no_join = 0; 19822bf64758SJosef Bacik fs_info->free_chunk_space = 0; 1983c8b97818SChris Mason 198490519d66SArne Jansen /* readahead state */ 198590519d66SArne Jansen INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT); 198690519d66SArne Jansen spin_lock_init(&fs_info->reada_lock); 198790519d66SArne Jansen 1988b34b086cSChris Mason fs_info->thread_pool_size = min_t(unsigned long, 1989b34b086cSChris Mason num_online_cpus() + 2, 8); 19900afbaf8cSChris Mason 19913eaa2885SChris Mason INIT_LIST_HEAD(&fs_info->ordered_extents); 19923eaa2885SChris Mason spin_lock_init(&fs_info->ordered_extent_lock); 199316cdcec7SMiao Xie fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), 199416cdcec7SMiao Xie GFP_NOFS); 199516cdcec7SMiao Xie if (!fs_info->delayed_root) { 199616cdcec7SMiao Xie err = -ENOMEM; 199716cdcec7SMiao Xie goto fail_iput; 199816cdcec7SMiao Xie } 199916cdcec7SMiao Xie btrfs_init_delayed_root(fs_info->delayed_root); 20003eaa2885SChris Mason 2001a2de733cSArne Jansen mutex_init(&fs_info->scrub_lock); 2002a2de733cSArne Jansen atomic_set(&fs_info->scrubs_running, 0); 2003a2de733cSArne Jansen atomic_set(&fs_info->scrub_pause_req, 0); 2004a2de733cSArne Jansen atomic_set(&fs_info->scrubs_paused, 0); 2005a2de733cSArne Jansen atomic_set(&fs_info->scrub_cancel_req, 0); 2006a2de733cSArne Jansen init_waitqueue_head(&fs_info->scrub_pause_wait); 2007a2de733cSArne Jansen init_rwsem(&fs_info->scrub_super_lock); 2008a2de733cSArne Jansen fs_info->scrub_workers_refcnt = 0; 2009a2de733cSArne Jansen 2010a061fc8dSChris Mason sb->s_blocksize = 4096; 2011a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 201232a88aa1SJens Axboe sb->s_bdi = &fs_info->bdi; 2013a061fc8dSChris Mason 201476dda93cSYan, Zheng fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; 201576dda93cSYan, Zheng fs_info->btree_inode->i_nlink = 1; 20160afbaf8cSChris Mason /* 20170afbaf8cSChris Mason * we set the i_size on the btree inode to the max possible int. 20180afbaf8cSChris Mason * the real end of the address space is determined by all of 20190afbaf8cSChris Mason * the devices in the system 20200afbaf8cSChris Mason */ 20210afbaf8cSChris Mason fs_info->btree_inode->i_size = OFFSET_MAX; 2022d98237b3SChris Mason fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 202304160088SChris Mason fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; 202404160088SChris Mason 20255d4f98a2SYan Zheng RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); 2026d1310b2eSChris Mason extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 2027f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 2028a8067e02SDavid Sterba extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree); 20290da5468fSChris Mason 2030d1310b2eSChris Mason BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 2031d1310b2eSChris Mason 20320f7d52f4SChris Mason BTRFS_I(fs_info->btree_inode)->root = tree_root; 20330f7d52f4SChris Mason memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 20340f7d52f4SChris Mason sizeof(struct btrfs_key)); 203576dda93cSYan, Zheng BTRFS_I(fs_info->btree_inode)->dummy_inode = 1; 203622b0ebdaSChris Mason insert_inode_hash(fs_info->btree_inode); 203739279cc3SChris Mason 2038e02119d5SChris Mason spin_lock_init(&fs_info->block_group_cache_lock); 20396bef4d31SEric Paris fs_info->block_group_cache_tree = RB_ROOT; 2040925baeddSChris Mason 204111833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[0], 2042f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 204311833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[1], 2044f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 204511833d66SYan Zheng fs_info->pinned_extents = &fs_info->freed_extents[0]; 2046e6dcd2dcSChris Mason fs_info->do_barriers = 1; 2047f9295749SChris Mason 2048d98237b3SChris Mason 20495a3f23d5SChris Mason mutex_init(&fs_info->ordered_operations_mutex); 205030ae8467SChris Mason mutex_init(&fs_info->tree_log_mutex); 2051925baeddSChris Mason mutex_init(&fs_info->chunk_mutex); 2052925baeddSChris Mason mutex_init(&fs_info->transaction_kthread_mutex); 2053a74a4b97SChris Mason mutex_init(&fs_info->cleaner_mutex); 2054a74a4b97SChris Mason mutex_init(&fs_info->volume_mutex); 2055276e680dSYan Zheng init_rwsem(&fs_info->extent_commit_sem); 2056c71bf099SYan, Zheng init_rwsem(&fs_info->cleanup_work_sem); 205776dda93cSYan, Zheng init_rwsem(&fs_info->subvol_sem); 2058fa9c0d79SChris Mason 2059fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); 2060fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->data_alloc_cluster); 2061fa9c0d79SChris Mason 20627d9eb12cSChris Mason init_waitqueue_head(&fs_info->transaction_throttle); 20633768f368SChris Mason init_waitqueue_head(&fs_info->transaction_wait); 2064bb9c12c9SSage Weil init_waitqueue_head(&fs_info->transaction_blocked_wait); 20654854ddd0SChris Mason init_waitqueue_head(&fs_info->async_submit_wait); 20669a8dd150SChris Mason 20670b86a832SChris Mason __setup_root(4096, 4096, 4096, 4096, tree_root, 20682c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 20697eccb903SChris Mason 2070a512bbf8SYan Zheng bh = btrfs_read_dev_super(fs_devices->latest_bdev); 207120b45077SDave Young if (!bh) { 207220b45077SDave Young err = -EINVAL; 207316cdcec7SMiao Xie goto fail_alloc; 207420b45077SDave Young } 207539279cc3SChris Mason 20766c41761fSDavid Sterba memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy)); 20776c41761fSDavid Sterba memcpy(fs_info->super_for_commit, fs_info->super_copy, 20786c41761fSDavid Sterba sizeof(*fs_info->super_for_commit)); 2079a061fc8dSChris Mason brelse(bh); 20805f39d397SChris Mason 20816c41761fSDavid Sterba memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); 20820b86a832SChris Mason 20836c41761fSDavid Sterba disk_super = fs_info->super_copy; 20840f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 208516cdcec7SMiao Xie goto fail_alloc; 20860f7d52f4SChris Mason 2087acce952bSliubo /* check FS state, whether FS is broken. */ 2088acce952bSliubo fs_info->fs_state |= btrfs_super_flags(disk_super); 2089acce952bSliubo 2090acce952bSliubo btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); 2091acce952bSliubo 209275e7cb7fSLiu Bo /* 2093af31f5e5SChris Mason * run through our array of backup supers and setup 2094af31f5e5SChris Mason * our ring pointer to the oldest one 2095af31f5e5SChris Mason */ 2096af31f5e5SChris Mason generation = btrfs_super_generation(disk_super); 2097af31f5e5SChris Mason find_oldest_super_backup(fs_info, generation); 2098af31f5e5SChris Mason 2099af31f5e5SChris Mason /* 210075e7cb7fSLiu Bo * In the long term, we'll store the compression type in the super 210175e7cb7fSLiu Bo * block, and it'll be used for per file compression control. 210275e7cb7fSLiu Bo */ 210375e7cb7fSLiu Bo fs_info->compress_type = BTRFS_COMPRESS_ZLIB; 210475e7cb7fSLiu Bo 21052b82032cSYan Zheng ret = btrfs_parse_options(tree_root, options); 21062b82032cSYan Zheng if (ret) { 21072b82032cSYan Zheng err = ret; 210816cdcec7SMiao Xie goto fail_alloc; 21092b82032cSYan Zheng } 2110dfe25020SChris Mason 2111f2b636e8SJosef Bacik features = btrfs_super_incompat_flags(disk_super) & 2112f2b636e8SJosef Bacik ~BTRFS_FEATURE_INCOMPAT_SUPP; 2113f2b636e8SJosef Bacik if (features) { 2114f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount because of " 2115f2b636e8SJosef Bacik "unsupported optional features (%Lx).\n", 211621380931SJoel Becker (unsigned long long)features); 2117f2b636e8SJosef Bacik err = -EINVAL; 211816cdcec7SMiao Xie goto fail_alloc; 2119f2b636e8SJosef Bacik } 2120f2b636e8SJosef Bacik 21215d4f98a2SYan Zheng features = btrfs_super_incompat_flags(disk_super); 21225d4f98a2SYan Zheng features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; 2123a6fa6faeSLi Zefan if (tree_root->fs_info->compress_type & BTRFS_COMPRESS_LZO) 2124a6fa6faeSLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 21255d4f98a2SYan Zheng btrfs_set_super_incompat_flags(disk_super, features); 21265d4f98a2SYan Zheng 2127f2b636e8SJosef Bacik features = btrfs_super_compat_ro_flags(disk_super) & 2128f2b636e8SJosef Bacik ~BTRFS_FEATURE_COMPAT_RO_SUPP; 2129f2b636e8SJosef Bacik if (!(sb->s_flags & MS_RDONLY) && features) { 2130f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " 2131f2b636e8SJosef Bacik "unsupported option features (%Lx).\n", 213221380931SJoel Becker (unsigned long long)features); 2133f2b636e8SJosef Bacik err = -EINVAL; 213416cdcec7SMiao Xie goto fail_alloc; 2135f2b636e8SJosef Bacik } 213661d92c32SChris Mason 213761d92c32SChris Mason btrfs_init_workers(&fs_info->generic_worker, 213861d92c32SChris Mason "genwork", 1, NULL); 213961d92c32SChris Mason 21405443be45SChris Mason btrfs_init_workers(&fs_info->workers, "worker", 214161d92c32SChris Mason fs_info->thread_pool_size, 214261d92c32SChris Mason &fs_info->generic_worker); 2143c8b97818SChris Mason 2144771ed689SChris Mason btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", 214561d92c32SChris Mason fs_info->thread_pool_size, 214661d92c32SChris Mason &fs_info->generic_worker); 2147771ed689SChris Mason 21485443be45SChris Mason btrfs_init_workers(&fs_info->submit_workers, "submit", 2149b720d209SChris Mason min_t(u64, fs_devices->num_devices, 215061d92c32SChris Mason fs_info->thread_pool_size), 215161d92c32SChris Mason &fs_info->generic_worker); 215261b49440SChris Mason 2153bab39bf9SJosef Bacik btrfs_init_workers(&fs_info->caching_workers, "cache", 2154bab39bf9SJosef Bacik 2, &fs_info->generic_worker); 2155bab39bf9SJosef Bacik 215661b49440SChris Mason /* a higher idle thresh on the submit workers makes it much more 215761b49440SChris Mason * likely that bios will be send down in a sane order to the 215861b49440SChris Mason * devices 215961b49440SChris Mason */ 216061b49440SChris Mason fs_info->submit_workers.idle_thresh = 64; 216153863232SChris Mason 2162771ed689SChris Mason fs_info->workers.idle_thresh = 16; 21634a69a410SChris Mason fs_info->workers.ordered = 1; 216461b49440SChris Mason 2165771ed689SChris Mason fs_info->delalloc_workers.idle_thresh = 2; 2166771ed689SChris Mason fs_info->delalloc_workers.ordered = 1; 2167771ed689SChris Mason 216861d92c32SChris Mason btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, 216961d92c32SChris Mason &fs_info->generic_worker); 21705443be45SChris Mason btrfs_init_workers(&fs_info->endio_workers, "endio", 217161d92c32SChris Mason fs_info->thread_pool_size, 217261d92c32SChris Mason &fs_info->generic_worker); 2173d20f7043SChris Mason btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", 217461d92c32SChris Mason fs_info->thread_pool_size, 217561d92c32SChris Mason &fs_info->generic_worker); 2176cad321adSChris Mason btrfs_init_workers(&fs_info->endio_meta_write_workers, 217761d92c32SChris Mason "endio-meta-write", fs_info->thread_pool_size, 217861d92c32SChris Mason &fs_info->generic_worker); 21795443be45SChris Mason btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", 218061d92c32SChris Mason fs_info->thread_pool_size, 218161d92c32SChris Mason &fs_info->generic_worker); 21820cb59c99SJosef Bacik btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write", 21830cb59c99SJosef Bacik 1, &fs_info->generic_worker); 218416cdcec7SMiao Xie btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta", 218516cdcec7SMiao Xie fs_info->thread_pool_size, 218616cdcec7SMiao Xie &fs_info->generic_worker); 218790519d66SArne Jansen btrfs_init_workers(&fs_info->readahead_workers, "readahead", 218890519d66SArne Jansen fs_info->thread_pool_size, 218990519d66SArne Jansen &fs_info->generic_worker); 219061b49440SChris Mason 219161b49440SChris Mason /* 219261b49440SChris Mason * endios are largely parallel and should have a very 219361b49440SChris Mason * low idle thresh 219461b49440SChris Mason */ 219561b49440SChris Mason fs_info->endio_workers.idle_thresh = 4; 2196b51912c9SChris Mason fs_info->endio_meta_workers.idle_thresh = 4; 2197b51912c9SChris Mason 21989042846bSChris Mason fs_info->endio_write_workers.idle_thresh = 2; 21999042846bSChris Mason fs_info->endio_meta_write_workers.idle_thresh = 2; 220090519d66SArne Jansen fs_info->readahead_workers.idle_thresh = 2; 22019042846bSChris Mason 22024543df7eSChris Mason btrfs_start_workers(&fs_info->workers, 1); 220361d92c32SChris Mason btrfs_start_workers(&fs_info->generic_worker, 1); 22041cc127b5SChris Mason btrfs_start_workers(&fs_info->submit_workers, 1); 2205771ed689SChris Mason btrfs_start_workers(&fs_info->delalloc_workers, 1); 2206247e743cSChris Mason btrfs_start_workers(&fs_info->fixup_workers, 1); 22079042846bSChris Mason btrfs_start_workers(&fs_info->endio_workers, 1); 22089042846bSChris Mason btrfs_start_workers(&fs_info->endio_meta_workers, 1); 22099042846bSChris Mason btrfs_start_workers(&fs_info->endio_meta_write_workers, 1); 22109042846bSChris Mason btrfs_start_workers(&fs_info->endio_write_workers, 1); 22110cb59c99SJosef Bacik btrfs_start_workers(&fs_info->endio_freespace_worker, 1); 221216cdcec7SMiao Xie btrfs_start_workers(&fs_info->delayed_workers, 1); 2213bab39bf9SJosef Bacik btrfs_start_workers(&fs_info->caching_workers, 1); 221490519d66SArne Jansen btrfs_start_workers(&fs_info->readahead_workers, 1); 22154543df7eSChris Mason 22164575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 2217c8b97818SChris Mason fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, 2218c8b97818SChris Mason 4 * 1024 * 1024 / PAGE_CACHE_SIZE); 22194575c9ccSChris Mason 2220db94535dSChris Mason nodesize = btrfs_super_nodesize(disk_super); 2221db94535dSChris Mason leafsize = btrfs_super_leafsize(disk_super); 2222db94535dSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 222387ee04ebSChris Mason stripesize = btrfs_super_stripesize(disk_super); 2224db94535dSChris Mason tree_root->nodesize = nodesize; 2225db94535dSChris Mason tree_root->leafsize = leafsize; 2226db94535dSChris Mason tree_root->sectorsize = sectorsize; 222787ee04ebSChris Mason tree_root->stripesize = stripesize; 2228a061fc8dSChris Mason 2229a061fc8dSChris Mason sb->s_blocksize = sectorsize; 2230a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 2231db94535dSChris Mason 223239279cc3SChris Mason if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, 223339279cc3SChris Mason sizeof(disk_super->magic))) { 2234d397712bSChris Mason printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id); 223539279cc3SChris Mason goto fail_sb_buffer; 223639279cc3SChris Mason } 223719c00ddcSChris Mason 2238925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 2239e4404d6eSYan Zheng ret = btrfs_read_sys_array(tree_root); 2240925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 224184eed90fSChris Mason if (ret) { 2242d397712bSChris Mason printk(KERN_WARNING "btrfs: failed to read the system " 2243d397712bSChris Mason "array on %s\n", sb->s_id); 22445d4f98a2SYan Zheng goto fail_sb_buffer; 224584eed90fSChris Mason } 22460b86a832SChris Mason 22470b86a832SChris Mason blocksize = btrfs_level_size(tree_root, 22480b86a832SChris Mason btrfs_super_chunk_root_level(disk_super)); 224984234f3aSYan Zheng generation = btrfs_super_chunk_root_generation(disk_super); 22500b86a832SChris Mason 22510b86a832SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 22520b86a832SChris Mason chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); 22530b86a832SChris Mason 22540b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 22550b86a832SChris Mason btrfs_super_chunk_root(disk_super), 225684234f3aSYan Zheng blocksize, generation); 22570b86a832SChris Mason BUG_ON(!chunk_root->node); 225883121942SDavid Woodhouse if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { 225983121942SDavid Woodhouse printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", 226083121942SDavid Woodhouse sb->s_id); 2261af31f5e5SChris Mason goto fail_tree_roots; 226283121942SDavid Woodhouse } 22635d4f98a2SYan Zheng btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); 22645d4f98a2SYan Zheng chunk_root->commit_root = btrfs_root_node(chunk_root); 22650b86a832SChris Mason 2266e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 2267e17cade2SChris Mason (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), 2268e17cade2SChris Mason BTRFS_UUID_SIZE); 2269e17cade2SChris Mason 2270925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 22710b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 2272925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 22732b82032cSYan Zheng if (ret) { 2274d397712bSChris Mason printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n", 2275d397712bSChris Mason sb->s_id); 2276af31f5e5SChris Mason goto fail_tree_roots; 22772b82032cSYan Zheng } 22780b86a832SChris Mason 2279dfe25020SChris Mason btrfs_close_extra_devices(fs_devices); 2280dfe25020SChris Mason 2281af31f5e5SChris Mason retry_root_backup: 2282db94535dSChris Mason blocksize = btrfs_level_size(tree_root, 2283db94535dSChris Mason btrfs_super_root_level(disk_super)); 228484234f3aSYan Zheng generation = btrfs_super_generation(disk_super); 22850b86a832SChris Mason 2286e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 2287db94535dSChris Mason btrfs_super_root(disk_super), 228884234f3aSYan Zheng blocksize, generation); 2289af31f5e5SChris Mason if (!tree_root->node || 2290af31f5e5SChris Mason !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { 229183121942SDavid Woodhouse printk(KERN_WARNING "btrfs: failed to read tree root on %s\n", 229283121942SDavid Woodhouse sb->s_id); 2293af31f5e5SChris Mason 2294af31f5e5SChris Mason goto recovery_tree_root; 229583121942SDavid Woodhouse } 2296af31f5e5SChris Mason 22975d4f98a2SYan Zheng btrfs_set_root_node(&tree_root->root_item, tree_root->node); 22985d4f98a2SYan Zheng tree_root->commit_root = btrfs_root_node(tree_root); 2299db94535dSChris Mason 2300db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 2301e20d96d6SChris Mason BTRFS_EXTENT_TREE_OBJECTID, extent_root); 23020b86a832SChris Mason if (ret) 2303af31f5e5SChris Mason goto recovery_tree_root; 23040b86a832SChris Mason extent_root->track_dirty = 1; 23050b86a832SChris Mason 23060b86a832SChris Mason ret = find_and_setup_root(tree_root, fs_info, 23070b86a832SChris Mason BTRFS_DEV_TREE_OBJECTID, dev_root); 23080b86a832SChris Mason if (ret) 2309af31f5e5SChris Mason goto recovery_tree_root; 23105d4f98a2SYan Zheng dev_root->track_dirty = 1; 23113768f368SChris Mason 2312d20f7043SChris Mason ret = find_and_setup_root(tree_root, fs_info, 2313d20f7043SChris Mason BTRFS_CSUM_TREE_OBJECTID, csum_root); 2314d20f7043SChris Mason if (ret) 2315af31f5e5SChris Mason goto recovery_tree_root; 2316d20f7043SChris Mason 2317d20f7043SChris Mason csum_root->track_dirty = 1; 2318d20f7043SChris Mason 23198929ecfaSYan, Zheng fs_info->generation = generation; 23208929ecfaSYan, Zheng fs_info->last_trans_committed = generation; 23218929ecfaSYan, Zheng fs_info->data_alloc_profile = (u64)-1; 23228929ecfaSYan, Zheng fs_info->metadata_alloc_profile = (u64)-1; 23238929ecfaSYan, Zheng fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; 23248929ecfaSYan, Zheng 2325c59021f8Sliubo ret = btrfs_init_space_info(fs_info); 2326c59021f8Sliubo if (ret) { 2327c59021f8Sliubo printk(KERN_ERR "Failed to initial space info: %d\n", ret); 2328c59021f8Sliubo goto fail_block_groups; 2329c59021f8Sliubo } 2330c59021f8Sliubo 23311b1d1f66SJosef Bacik ret = btrfs_read_block_groups(extent_root); 23321b1d1f66SJosef Bacik if (ret) { 23331b1d1f66SJosef Bacik printk(KERN_ERR "Failed to read block groups: %d\n", ret); 23341b1d1f66SJosef Bacik goto fail_block_groups; 23351b1d1f66SJosef Bacik } 23369078a3e1SChris Mason 2337a74a4b97SChris Mason fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, 2338a74a4b97SChris Mason "btrfs-cleaner"); 233957506d50SQinghuang Feng if (IS_ERR(fs_info->cleaner_kthread)) 23401b1d1f66SJosef Bacik goto fail_block_groups; 2341a74a4b97SChris Mason 2342a74a4b97SChris Mason fs_info->transaction_kthread = kthread_run(transaction_kthread, 2343a74a4b97SChris Mason tree_root, 2344a74a4b97SChris Mason "btrfs-transaction"); 234557506d50SQinghuang Feng if (IS_ERR(fs_info->transaction_kthread)) 23463f157a2fSChris Mason goto fail_cleaner; 2347a74a4b97SChris Mason 2348c289811cSChris Mason if (!btrfs_test_opt(tree_root, SSD) && 2349c289811cSChris Mason !btrfs_test_opt(tree_root, NOSSD) && 2350c289811cSChris Mason !fs_info->fs_devices->rotating) { 2351c289811cSChris Mason printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD " 2352c289811cSChris Mason "mode\n"); 2353c289811cSChris Mason btrfs_set_opt(fs_info->mount_opt, SSD); 2354c289811cSChris Mason } 2355c289811cSChris Mason 2356acce952bSliubo /* do not make disk changes in broken FS */ 2357acce952bSliubo if (btrfs_super_log_root(disk_super) != 0 && 2358acce952bSliubo !(fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)) { 2359e02119d5SChris Mason u64 bytenr = btrfs_super_log_root(disk_super); 2360d18a2c44SChris Mason 23617c2ca468SChris Mason if (fs_devices->rw_devices == 0) { 2362d397712bSChris Mason printk(KERN_WARNING "Btrfs log replay required " 2363d397712bSChris Mason "on RO media\n"); 23647c2ca468SChris Mason err = -EIO; 23657c2ca468SChris Mason goto fail_trans_kthread; 23667c2ca468SChris Mason } 2367e02119d5SChris Mason blocksize = 2368e02119d5SChris Mason btrfs_level_size(tree_root, 2369e02119d5SChris Mason btrfs_super_log_root_level(disk_super)); 2370e02119d5SChris Mason 2371676e4c86SDan Carpenter log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); 2372676e4c86SDan Carpenter if (!log_tree_root) { 2373676e4c86SDan Carpenter err = -ENOMEM; 2374676e4c86SDan Carpenter goto fail_trans_kthread; 2375676e4c86SDan Carpenter } 2376e02119d5SChris Mason 2377e02119d5SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 2378e02119d5SChris Mason log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); 2379e02119d5SChris Mason 2380e02119d5SChris Mason log_tree_root->node = read_tree_block(tree_root, bytenr, 238184234f3aSYan Zheng blocksize, 238284234f3aSYan Zheng generation + 1); 2383e02119d5SChris Mason ret = btrfs_recover_log_trees(log_tree_root); 2384e02119d5SChris Mason BUG_ON(ret); 2385e556ce2cSYan Zheng 2386e556ce2cSYan Zheng if (sb->s_flags & MS_RDONLY) { 2387e556ce2cSYan Zheng ret = btrfs_commit_super(tree_root); 2388e556ce2cSYan Zheng BUG_ON(ret); 2389e556ce2cSYan Zheng } 2390e02119d5SChris Mason } 23911a40e23bSZheng Yan 239276dda93cSYan, Zheng ret = btrfs_find_orphan_roots(tree_root); 239376dda93cSYan, Zheng BUG_ON(ret); 239476dda93cSYan, Zheng 23957c2ca468SChris Mason if (!(sb->s_flags & MS_RDONLY)) { 2396d68fc57bSYan, Zheng ret = btrfs_cleanup_fs_roots(fs_info); 2397d68fc57bSYan, Zheng BUG_ON(ret); 2398d68fc57bSYan, Zheng 23995d4f98a2SYan Zheng ret = btrfs_recover_relocation(tree_root); 2400d7ce5843SMiao Xie if (ret < 0) { 2401d7ce5843SMiao Xie printk(KERN_WARNING 2402d7ce5843SMiao Xie "btrfs: failed to recover relocation\n"); 2403d7ce5843SMiao Xie err = -EINVAL; 2404d7ce5843SMiao Xie goto fail_trans_kthread; 2405d7ce5843SMiao Xie } 24067c2ca468SChris Mason } 24071a40e23bSZheng Yan 24083de4586cSChris Mason location.objectid = BTRFS_FS_TREE_OBJECTID; 24093de4586cSChris Mason location.type = BTRFS_ROOT_ITEM_KEY; 24103de4586cSChris Mason location.offset = (u64)-1; 24113de4586cSChris Mason 24123de4586cSChris Mason fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); 24133de4586cSChris Mason if (!fs_info->fs_root) 24147c2ca468SChris Mason goto fail_trans_kthread; 24153140c9a3SDan Carpenter if (IS_ERR(fs_info->fs_root)) { 24163140c9a3SDan Carpenter err = PTR_ERR(fs_info->fs_root); 24173140c9a3SDan Carpenter goto fail_trans_kthread; 24183140c9a3SDan Carpenter } 2419c289811cSChris Mason 2420e3acc2a6SJosef Bacik if (!(sb->s_flags & MS_RDONLY)) { 2421e3acc2a6SJosef Bacik down_read(&fs_info->cleanup_work_sem); 242266b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_info->fs_root); 242366b4ffd1SJosef Bacik if (!err) 242466b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_info->tree_root); 2425e3acc2a6SJosef Bacik up_read(&fs_info->cleanup_work_sem); 242666b4ffd1SJosef Bacik if (err) { 242766b4ffd1SJosef Bacik close_ctree(tree_root); 242866b4ffd1SJosef Bacik return ERR_PTR(err); 242966b4ffd1SJosef Bacik } 2430e3acc2a6SJosef Bacik } 2431e3acc2a6SJosef Bacik 24320f7d52f4SChris Mason return tree_root; 243339279cc3SChris Mason 24347c2ca468SChris Mason fail_trans_kthread: 24357c2ca468SChris Mason kthread_stop(fs_info->transaction_kthread); 24363f157a2fSChris Mason fail_cleaner: 2437a74a4b97SChris Mason kthread_stop(fs_info->cleaner_kthread); 24387c2ca468SChris Mason 24397c2ca468SChris Mason /* 24407c2ca468SChris Mason * make sure we're done with the btree inode before we stop our 24417c2ca468SChris Mason * kthreads 24427c2ca468SChris Mason */ 24437c2ca468SChris Mason filemap_write_and_wait(fs_info->btree_inode->i_mapping); 24447c2ca468SChris Mason invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 24457c2ca468SChris Mason 24461b1d1f66SJosef Bacik fail_block_groups: 24471b1d1f66SJosef Bacik btrfs_free_block_groups(fs_info); 2448af31f5e5SChris Mason 2449af31f5e5SChris Mason fail_tree_roots: 2450af31f5e5SChris Mason free_root_pointers(fs_info, 1); 2451af31f5e5SChris Mason 245239279cc3SChris Mason fail_sb_buffer: 245361d92c32SChris Mason btrfs_stop_workers(&fs_info->generic_worker); 2454306c8b68SChris Mason btrfs_stop_workers(&fs_info->readahead_workers); 2455247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 2456771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 24578b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 24588b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 2459d20f7043SChris Mason btrfs_stop_workers(&fs_info->endio_meta_workers); 2460cad321adSChris Mason btrfs_stop_workers(&fs_info->endio_meta_write_workers); 2461e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 24620cb59c99SJosef Bacik btrfs_stop_workers(&fs_info->endio_freespace_worker); 24631cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 246416cdcec7SMiao Xie btrfs_stop_workers(&fs_info->delayed_workers); 2465bab39bf9SJosef Bacik btrfs_stop_workers(&fs_info->caching_workers); 246616cdcec7SMiao Xie fail_alloc: 24674543df7eSChris Mason fail_iput: 24687c2ca468SChris Mason invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 24694543df7eSChris Mason iput(fs_info->btree_inode); 24707e662854SQinghuang Feng 2471dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 247284eed90fSChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 2473ad081f14SJens Axboe fail_bdi: 24747e662854SQinghuang Feng bdi_destroy(&fs_info->bdi); 247576dda93cSYan, Zheng fail_srcu: 247676dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 24777e662854SQinghuang Feng fail: 24786c41761fSDavid Sterba free_fs_info(fs_info); 247939279cc3SChris Mason return ERR_PTR(err); 2480af31f5e5SChris Mason 2481af31f5e5SChris Mason recovery_tree_root: 2482af31f5e5SChris Mason 2483af31f5e5SChris Mason if (!btrfs_test_opt(tree_root, RECOVERY)) 2484af31f5e5SChris Mason goto fail_tree_roots; 2485af31f5e5SChris Mason 2486af31f5e5SChris Mason free_root_pointers(fs_info, 0); 2487af31f5e5SChris Mason 2488af31f5e5SChris Mason /* don't use the log in recovery mode, it won't be valid */ 2489af31f5e5SChris Mason btrfs_set_super_log_root(disk_super, 0); 2490af31f5e5SChris Mason 2491af31f5e5SChris Mason /* we can't trust the free space cache either */ 2492af31f5e5SChris Mason btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE); 2493af31f5e5SChris Mason 2494af31f5e5SChris Mason ret = next_root_backup(fs_info, fs_info->super_copy, 2495af31f5e5SChris Mason &num_backups_tried, &backup_index); 2496af31f5e5SChris Mason if (ret == -1) 2497af31f5e5SChris Mason goto fail_block_groups; 2498af31f5e5SChris Mason goto retry_root_backup; 2499eb60ceacSChris Mason } 2500eb60ceacSChris Mason 2501f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 2502f2984462SChris Mason { 2503f2984462SChris Mason char b[BDEVNAME_SIZE]; 2504f2984462SChris Mason 2505f2984462SChris Mason if (uptodate) { 2506f2984462SChris Mason set_buffer_uptodate(bh); 2507f2984462SChris Mason } else { 25087a36ddecSDavid Sterba printk_ratelimited(KERN_WARNING "lost page write due to " 2509f2984462SChris Mason "I/O error on %s\n", 2510f2984462SChris Mason bdevname(bh->b_bdev, b)); 25111259ab75SChris Mason /* note, we dont' set_buffer_write_io_error because we have 25121259ab75SChris Mason * our own ways of dealing with the IO errors 25131259ab75SChris Mason */ 2514f2984462SChris Mason clear_buffer_uptodate(bh); 2515f2984462SChris Mason } 2516f2984462SChris Mason unlock_buffer(bh); 2517f2984462SChris Mason put_bh(bh); 2518f2984462SChris Mason } 2519f2984462SChris Mason 2520a512bbf8SYan Zheng struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) 2521a512bbf8SYan Zheng { 2522a512bbf8SYan Zheng struct buffer_head *bh; 2523a512bbf8SYan Zheng struct buffer_head *latest = NULL; 2524a512bbf8SYan Zheng struct btrfs_super_block *super; 2525a512bbf8SYan Zheng int i; 2526a512bbf8SYan Zheng u64 transid = 0; 2527a512bbf8SYan Zheng u64 bytenr; 2528a512bbf8SYan Zheng 2529a512bbf8SYan Zheng /* we would like to check all the supers, but that would make 2530a512bbf8SYan Zheng * a btrfs mount succeed after a mkfs from a different FS. 2531a512bbf8SYan Zheng * So, we need to add a special mount option to scan for 2532a512bbf8SYan Zheng * later supers, using BTRFS_SUPER_MIRROR_MAX instead 2533a512bbf8SYan Zheng */ 2534a512bbf8SYan Zheng for (i = 0; i < 1; i++) { 2535a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2536a512bbf8SYan Zheng if (bytenr + 4096 >= i_size_read(bdev->bd_inode)) 2537a512bbf8SYan Zheng break; 2538a512bbf8SYan Zheng bh = __bread(bdev, bytenr / 4096, 4096); 2539a512bbf8SYan Zheng if (!bh) 2540a512bbf8SYan Zheng continue; 2541a512bbf8SYan Zheng 2542a512bbf8SYan Zheng super = (struct btrfs_super_block *)bh->b_data; 2543a512bbf8SYan Zheng if (btrfs_super_bytenr(super) != bytenr || 2544a512bbf8SYan Zheng strncmp((char *)(&super->magic), BTRFS_MAGIC, 2545a512bbf8SYan Zheng sizeof(super->magic))) { 2546a512bbf8SYan Zheng brelse(bh); 2547a512bbf8SYan Zheng continue; 2548a512bbf8SYan Zheng } 2549a512bbf8SYan Zheng 2550a512bbf8SYan Zheng if (!latest || btrfs_super_generation(super) > transid) { 2551a512bbf8SYan Zheng brelse(latest); 2552a512bbf8SYan Zheng latest = bh; 2553a512bbf8SYan Zheng transid = btrfs_super_generation(super); 2554a512bbf8SYan Zheng } else { 2555a512bbf8SYan Zheng brelse(bh); 2556a512bbf8SYan Zheng } 2557a512bbf8SYan Zheng } 2558a512bbf8SYan Zheng return latest; 2559a512bbf8SYan Zheng } 2560a512bbf8SYan Zheng 25614eedeb75SHisashi Hifumi /* 25624eedeb75SHisashi Hifumi * this should be called twice, once with wait == 0 and 25634eedeb75SHisashi Hifumi * once with wait == 1. When wait == 0 is done, all the buffer heads 25644eedeb75SHisashi Hifumi * we write are pinned. 25654eedeb75SHisashi Hifumi * 25664eedeb75SHisashi Hifumi * They are released when wait == 1 is done. 25674eedeb75SHisashi Hifumi * max_mirrors must be the same for both runs, and it indicates how 25684eedeb75SHisashi Hifumi * many supers on this one device should be written. 25694eedeb75SHisashi Hifumi * 25704eedeb75SHisashi Hifumi * max_mirrors == 0 means to write them all. 25714eedeb75SHisashi Hifumi */ 2572a512bbf8SYan Zheng static int write_dev_supers(struct btrfs_device *device, 2573a512bbf8SYan Zheng struct btrfs_super_block *sb, 2574a512bbf8SYan Zheng int do_barriers, int wait, int max_mirrors) 2575a512bbf8SYan Zheng { 2576a512bbf8SYan Zheng struct buffer_head *bh; 2577a512bbf8SYan Zheng int i; 2578a512bbf8SYan Zheng int ret; 2579a512bbf8SYan Zheng int errors = 0; 2580a512bbf8SYan Zheng u32 crc; 2581a512bbf8SYan Zheng u64 bytenr; 2582a512bbf8SYan Zheng int last_barrier = 0; 2583a512bbf8SYan Zheng 2584a512bbf8SYan Zheng if (max_mirrors == 0) 2585a512bbf8SYan Zheng max_mirrors = BTRFS_SUPER_MIRROR_MAX; 2586a512bbf8SYan Zheng 2587a512bbf8SYan Zheng /* make sure only the last submit_bh does a barrier */ 2588a512bbf8SYan Zheng if (do_barriers) { 2589a512bbf8SYan Zheng for (i = 0; i < max_mirrors; i++) { 2590a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2591a512bbf8SYan Zheng if (bytenr + BTRFS_SUPER_INFO_SIZE >= 2592a512bbf8SYan Zheng device->total_bytes) 2593a512bbf8SYan Zheng break; 2594a512bbf8SYan Zheng last_barrier = i; 2595a512bbf8SYan Zheng } 2596a512bbf8SYan Zheng } 2597a512bbf8SYan Zheng 2598a512bbf8SYan Zheng for (i = 0; i < max_mirrors; i++) { 2599a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2600a512bbf8SYan Zheng if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) 2601a512bbf8SYan Zheng break; 2602a512bbf8SYan Zheng 2603a512bbf8SYan Zheng if (wait) { 2604a512bbf8SYan Zheng bh = __find_get_block(device->bdev, bytenr / 4096, 2605a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 2606a512bbf8SYan Zheng BUG_ON(!bh); 2607a512bbf8SYan Zheng wait_on_buffer(bh); 26084eedeb75SHisashi Hifumi if (!buffer_uptodate(bh)) 26094eedeb75SHisashi Hifumi errors++; 26104eedeb75SHisashi Hifumi 26114eedeb75SHisashi Hifumi /* drop our reference */ 26124eedeb75SHisashi Hifumi brelse(bh); 26134eedeb75SHisashi Hifumi 26144eedeb75SHisashi Hifumi /* drop the reference from the wait == 0 run */ 2615a512bbf8SYan Zheng brelse(bh); 2616a512bbf8SYan Zheng continue; 2617a512bbf8SYan Zheng } else { 2618a512bbf8SYan Zheng btrfs_set_super_bytenr(sb, bytenr); 2619a512bbf8SYan Zheng 2620a512bbf8SYan Zheng crc = ~(u32)0; 2621a512bbf8SYan Zheng crc = btrfs_csum_data(NULL, (char *)sb + 2622a512bbf8SYan Zheng BTRFS_CSUM_SIZE, crc, 2623a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE - 2624a512bbf8SYan Zheng BTRFS_CSUM_SIZE); 2625a512bbf8SYan Zheng btrfs_csum_final(crc, sb->csum); 2626a512bbf8SYan Zheng 26274eedeb75SHisashi Hifumi /* 26284eedeb75SHisashi Hifumi * one reference for us, and we leave it for the 26294eedeb75SHisashi Hifumi * caller 26304eedeb75SHisashi Hifumi */ 2631a512bbf8SYan Zheng bh = __getblk(device->bdev, bytenr / 4096, 2632a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 2633a512bbf8SYan Zheng memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 2634a512bbf8SYan Zheng 26354eedeb75SHisashi Hifumi /* one reference for submit_bh */ 2636a512bbf8SYan Zheng get_bh(bh); 26374eedeb75SHisashi Hifumi 26384eedeb75SHisashi Hifumi set_buffer_uptodate(bh); 2639a512bbf8SYan Zheng lock_buffer(bh); 2640a512bbf8SYan Zheng bh->b_end_io = btrfs_end_buffer_write_sync; 2641a512bbf8SYan Zheng } 2642a512bbf8SYan Zheng 2643c3b9a62cSChristoph Hellwig if (i == last_barrier && do_barriers) 2644c3b9a62cSChristoph Hellwig ret = submit_bh(WRITE_FLUSH_FUA, bh); 2645c3b9a62cSChristoph Hellwig else 2646ffbd517dSChris Mason ret = submit_bh(WRITE_SYNC, bh); 2647a512bbf8SYan Zheng 26484eedeb75SHisashi Hifumi if (ret) 2649a512bbf8SYan Zheng errors++; 2650a512bbf8SYan Zheng } 2651a512bbf8SYan Zheng return errors < i ? 0 : -1; 2652a512bbf8SYan Zheng } 2653a512bbf8SYan Zheng 2654a512bbf8SYan Zheng int write_all_supers(struct btrfs_root *root, int max_mirrors) 2655f2984462SChris Mason { 2656e5e9a520SChris Mason struct list_head *head; 2657f2984462SChris Mason struct btrfs_device *dev; 2658a061fc8dSChris Mason struct btrfs_super_block *sb; 2659f2984462SChris Mason struct btrfs_dev_item *dev_item; 2660f2984462SChris Mason int ret; 2661f2984462SChris Mason int do_barriers; 2662a236aed1SChris Mason int max_errors; 2663a236aed1SChris Mason int total_errors = 0; 2664a061fc8dSChris Mason u64 flags; 2665f2984462SChris Mason 26666c41761fSDavid Sterba max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1; 2667f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 2668af31f5e5SChris Mason backup_super_roots(root->fs_info); 2669f2984462SChris Mason 26706c41761fSDavid Sterba sb = root->fs_info->super_for_commit; 2671a061fc8dSChris Mason dev_item = &sb->dev_item; 2672e5e9a520SChris Mason 2673174ba509SChris Mason mutex_lock(&root->fs_info->fs_devices->device_list_mutex); 2674e5e9a520SChris Mason head = &root->fs_info->fs_devices->devices; 26751f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 2676dfe25020SChris Mason if (!dev->bdev) { 2677dfe25020SChris Mason total_errors++; 2678dfe25020SChris Mason continue; 2679dfe25020SChris Mason } 26802b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 2681dfe25020SChris Mason continue; 2682dfe25020SChris Mason 26832b82032cSYan Zheng btrfs_set_stack_device_generation(dev_item, 0); 2684a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 2685a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 2686a061fc8dSChris Mason btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); 2687a061fc8dSChris Mason btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); 2688a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 2689a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 2690a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 2691a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 26922b82032cSYan Zheng memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 2693a512bbf8SYan Zheng 2694a061fc8dSChris Mason flags = btrfs_super_flags(sb); 2695a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 2696f2984462SChris Mason 2697a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); 2698a236aed1SChris Mason if (ret) 2699a236aed1SChris Mason total_errors++; 2700f2984462SChris Mason } 2701a236aed1SChris Mason if (total_errors > max_errors) { 2702d397712bSChris Mason printk(KERN_ERR "btrfs: %d errors while writing supers\n", 2703d397712bSChris Mason total_errors); 2704a236aed1SChris Mason BUG(); 2705a236aed1SChris Mason } 2706f2984462SChris Mason 2707a512bbf8SYan Zheng total_errors = 0; 27081f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 2709dfe25020SChris Mason if (!dev->bdev) 2710dfe25020SChris Mason continue; 27112b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 2712dfe25020SChris Mason continue; 2713dfe25020SChris Mason 2714a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); 2715a512bbf8SYan Zheng if (ret) 27161259ab75SChris Mason total_errors++; 2717f2984462SChris Mason } 2718174ba509SChris Mason mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); 2719a236aed1SChris Mason if (total_errors > max_errors) { 2720d397712bSChris Mason printk(KERN_ERR "btrfs: %d errors while writing supers\n", 2721d397712bSChris Mason total_errors); 2722a236aed1SChris Mason BUG(); 2723a236aed1SChris Mason } 2724f2984462SChris Mason return 0; 2725f2984462SChris Mason } 2726f2984462SChris Mason 2727a512bbf8SYan Zheng int write_ctree_super(struct btrfs_trans_handle *trans, 2728a512bbf8SYan Zheng struct btrfs_root *root, int max_mirrors) 2729cfaa7295SChris Mason { 2730e66f709bSChris Mason int ret; 27312c90e5d6SChris Mason 2732a512bbf8SYan Zheng ret = write_all_supers(root, max_mirrors); 27335f39d397SChris Mason return ret; 2734cfaa7295SChris Mason } 2735cfaa7295SChris Mason 27365eda7b5eSChris Mason int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) 27372619ba1fSChris Mason { 27384df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 27392619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 27402619ba1fSChris Mason (unsigned long)root->root_key.objectid); 27414df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 274276dda93cSYan, Zheng 274376dda93cSYan, Zheng if (btrfs_root_refs(&root->root_item) == 0) 274476dda93cSYan, Zheng synchronize_srcu(&fs_info->subvol_srcu); 274576dda93cSYan, Zheng 2746581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_pinned); 2747581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_ctl); 27484df27c4dSYan, Zheng free_fs_root(root); 27494df27c4dSYan, Zheng return 0; 27504df27c4dSYan, Zheng } 27514df27c4dSYan, Zheng 27524df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root) 27534df27c4dSYan, Zheng { 275482d5902dSLi Zefan iput(root->cache_inode); 27554df27c4dSYan, Zheng WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); 27560ee5dc67SAl Viro if (root->anon_dev) 27570ee5dc67SAl Viro free_anon_bdev(root->anon_dev); 27585f39d397SChris Mason free_extent_buffer(root->node); 27595f39d397SChris Mason free_extent_buffer(root->commit_root); 2760581bb050SLi Zefan kfree(root->free_ino_ctl); 2761581bb050SLi Zefan kfree(root->free_ino_pinned); 276258176a96SJosef Bacik kfree(root->name); 27632619ba1fSChris Mason kfree(root); 27642619ba1fSChris Mason } 27652619ba1fSChris Mason 276635b7e476SChris Mason static int del_fs_roots(struct btrfs_fs_info *fs_info) 27670f7d52f4SChris Mason { 27680f7d52f4SChris Mason int ret; 27690f7d52f4SChris Mason struct btrfs_root *gang[8]; 27700f7d52f4SChris Mason int i; 27710f7d52f4SChris Mason 277276dda93cSYan, Zheng while (!list_empty(&fs_info->dead_roots)) { 277376dda93cSYan, Zheng gang[0] = list_entry(fs_info->dead_roots.next, 277476dda93cSYan, Zheng struct btrfs_root, root_list); 277576dda93cSYan, Zheng list_del(&gang[0]->root_list); 277676dda93cSYan, Zheng 277776dda93cSYan, Zheng if (gang[0]->in_radix) { 277876dda93cSYan, Zheng btrfs_free_fs_root(fs_info, gang[0]); 277976dda93cSYan, Zheng } else { 278076dda93cSYan, Zheng free_extent_buffer(gang[0]->node); 278176dda93cSYan, Zheng free_extent_buffer(gang[0]->commit_root); 278276dda93cSYan, Zheng kfree(gang[0]); 278376dda93cSYan, Zheng } 278476dda93cSYan, Zheng } 278576dda93cSYan, Zheng 27860f7d52f4SChris Mason while (1) { 27870f7d52f4SChris Mason ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 27880f7d52f4SChris Mason (void **)gang, 0, 27890f7d52f4SChris Mason ARRAY_SIZE(gang)); 27900f7d52f4SChris Mason if (!ret) 27910f7d52f4SChris Mason break; 27922619ba1fSChris Mason for (i = 0; i < ret; i++) 27935eda7b5eSChris Mason btrfs_free_fs_root(fs_info, gang[i]); 27940f7d52f4SChris Mason } 27950f7d52f4SChris Mason return 0; 27960f7d52f4SChris Mason } 2797b4100d64SChris Mason 2798c146afadSYan Zheng int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) 2799c146afadSYan Zheng { 2800c146afadSYan Zheng u64 root_objectid = 0; 2801c146afadSYan Zheng struct btrfs_root *gang[8]; 2802c146afadSYan Zheng int i; 2803c146afadSYan Zheng int ret; 2804c146afadSYan Zheng 2805c146afadSYan Zheng while (1) { 2806c146afadSYan Zheng ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 2807c146afadSYan Zheng (void **)gang, root_objectid, 2808c146afadSYan Zheng ARRAY_SIZE(gang)); 2809c146afadSYan Zheng if (!ret) 2810c146afadSYan Zheng break; 28115d4f98a2SYan Zheng 28125d4f98a2SYan Zheng root_objectid = gang[ret - 1]->root_key.objectid + 1; 2813c146afadSYan Zheng for (i = 0; i < ret; i++) { 281466b4ffd1SJosef Bacik int err; 281566b4ffd1SJosef Bacik 2816c146afadSYan Zheng root_objectid = gang[i]->root_key.objectid; 281766b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(gang[i]); 281866b4ffd1SJosef Bacik if (err) 281966b4ffd1SJosef Bacik return err; 2820c146afadSYan Zheng } 2821c146afadSYan Zheng root_objectid++; 2822c146afadSYan Zheng } 2823c146afadSYan Zheng return 0; 2824c146afadSYan Zheng } 2825c146afadSYan Zheng 2826c146afadSYan Zheng int btrfs_commit_super(struct btrfs_root *root) 2827c146afadSYan Zheng { 2828c146afadSYan Zheng struct btrfs_trans_handle *trans; 2829c146afadSYan Zheng int ret; 2830c146afadSYan Zheng 2831c146afadSYan Zheng mutex_lock(&root->fs_info->cleaner_mutex); 283224bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 2833c146afadSYan Zheng btrfs_clean_old_snapshots(root); 2834c146afadSYan Zheng mutex_unlock(&root->fs_info->cleaner_mutex); 2835c71bf099SYan, Zheng 2836c71bf099SYan, Zheng /* wait until ongoing cleanup work done */ 2837c71bf099SYan, Zheng down_write(&root->fs_info->cleanup_work_sem); 2838c71bf099SYan, Zheng up_write(&root->fs_info->cleanup_work_sem); 2839c71bf099SYan, Zheng 28407a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 28413612b495STsutomu Itoh if (IS_ERR(trans)) 28423612b495STsutomu Itoh return PTR_ERR(trans); 2843c146afadSYan Zheng ret = btrfs_commit_transaction(trans, root); 2844c146afadSYan Zheng BUG_ON(ret); 2845c146afadSYan Zheng /* run commit again to drop the original snapshot */ 28467a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 28473612b495STsutomu Itoh if (IS_ERR(trans)) 28483612b495STsutomu Itoh return PTR_ERR(trans); 2849c146afadSYan Zheng btrfs_commit_transaction(trans, root); 2850c146afadSYan Zheng ret = btrfs_write_and_wait_transaction(NULL, root); 2851c146afadSYan Zheng BUG_ON(ret); 2852c146afadSYan Zheng 2853a512bbf8SYan Zheng ret = write_ctree_super(NULL, root, 0); 2854c146afadSYan Zheng return ret; 2855c146afadSYan Zheng } 2856c146afadSYan Zheng 2857e20d96d6SChris Mason int close_ctree(struct btrfs_root *root) 2858eb60ceacSChris Mason { 28590f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 2860c146afadSYan Zheng int ret; 2861e089f05cSChris Mason 2862facda1e7SChris Mason fs_info->closing = 1; 2863a2135011SChris Mason smp_mb(); 2864a2135011SChris Mason 2865a2de733cSArne Jansen btrfs_scrub_cancel(root); 28664cb5300bSChris Mason 28674cb5300bSChris Mason /* wait for any defraggers to finish */ 28684cb5300bSChris Mason wait_event(fs_info->transaction_wait, 28694cb5300bSChris Mason (atomic_read(&fs_info->defrag_running) == 0)); 28704cb5300bSChris Mason 28714cb5300bSChris Mason /* clear out the rbtree of defraggable inodes */ 28724cb5300bSChris Mason btrfs_run_defrag_inodes(root->fs_info); 28734cb5300bSChris Mason 2874acce952bSliubo /* 2875acce952bSliubo * Here come 2 situations when btrfs is broken to flip readonly: 2876acce952bSliubo * 2877acce952bSliubo * 1. when btrfs flips readonly somewhere else before 2878acce952bSliubo * btrfs_commit_super, sb->s_flags has MS_RDONLY flag, 2879acce952bSliubo * and btrfs will skip to write sb directly to keep 2880acce952bSliubo * ERROR state on disk. 2881acce952bSliubo * 2882acce952bSliubo * 2. when btrfs flips readonly just in btrfs_commit_super, 2883ae0e47f0SJustin P. Mattock * and in such case, btrfs cannot write sb via btrfs_commit_super, 2884acce952bSliubo * and since fs_state has been set BTRFS_SUPER_FLAG_ERROR flag, 2885acce952bSliubo * btrfs will cleanup all FS resources first and write sb then. 2886acce952bSliubo */ 2887c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 2888c146afadSYan Zheng ret = btrfs_commit_super(root); 2889d397712bSChris Mason if (ret) 2890d397712bSChris Mason printk(KERN_ERR "btrfs: commit super ret %d\n", ret); 2891c146afadSYan Zheng } 2892ed2ff2cbSChris Mason 2893acce952bSliubo if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 2894acce952bSliubo ret = btrfs_error_commit_super(root); 2895acce952bSliubo if (ret) 2896acce952bSliubo printk(KERN_ERR "btrfs: commit super ret %d\n", ret); 2897acce952bSliubo } 2898acce952bSliubo 2899300e4f8aSJosef Bacik btrfs_put_block_group_cache(fs_info); 2900300e4f8aSJosef Bacik 29018929ecfaSYan, Zheng kthread_stop(root->fs_info->transaction_kthread); 29028929ecfaSYan, Zheng kthread_stop(root->fs_info->cleaner_kthread); 29038929ecfaSYan, Zheng 2904f25784b3SYan Zheng fs_info->closing = 2; 2905f25784b3SYan Zheng smp_mb(); 2906f25784b3SYan Zheng 2907b0c68f8bSChris Mason if (fs_info->delalloc_bytes) { 2908d397712bSChris Mason printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n", 290921380931SJoel Becker (unsigned long long)fs_info->delalloc_bytes); 2910b0c68f8bSChris Mason } 291131153d81SYan Zheng if (fs_info->total_ref_cache_size) { 2912d397712bSChris Mason printk(KERN_INFO "btrfs: at umount reference cache size %llu\n", 2913d397712bSChris Mason (unsigned long long)fs_info->total_ref_cache_size); 291431153d81SYan Zheng } 291531153d81SYan Zheng 29165f39d397SChris Mason free_extent_buffer(fs_info->extent_root->node); 29175d4f98a2SYan Zheng free_extent_buffer(fs_info->extent_root->commit_root); 29185f39d397SChris Mason free_extent_buffer(fs_info->tree_root->node); 29195d4f98a2SYan Zheng free_extent_buffer(fs_info->tree_root->commit_root); 29200b86a832SChris Mason free_extent_buffer(root->fs_info->chunk_root->node); 29215d4f98a2SYan Zheng free_extent_buffer(root->fs_info->chunk_root->commit_root); 29220b86a832SChris Mason free_extent_buffer(root->fs_info->dev_root->node); 29235d4f98a2SYan Zheng free_extent_buffer(root->fs_info->dev_root->commit_root); 2924d20f7043SChris Mason free_extent_buffer(root->fs_info->csum_root->node); 29255d4f98a2SYan Zheng free_extent_buffer(root->fs_info->csum_root->commit_root); 2926d20f7043SChris Mason 29279078a3e1SChris Mason btrfs_free_block_groups(root->fs_info); 2928c146afadSYan Zheng 29290f7d52f4SChris Mason del_fs_roots(fs_info); 2930d10c5f31SChris Mason 2931c146afadSYan Zheng iput(fs_info->btree_inode); 29329ad6b7bcSChris Mason 293361d92c32SChris Mason btrfs_stop_workers(&fs_info->generic_worker); 2934247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 2935771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 29368b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 29378b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 2938d20f7043SChris Mason btrfs_stop_workers(&fs_info->endio_meta_workers); 2939cad321adSChris Mason btrfs_stop_workers(&fs_info->endio_meta_write_workers); 2940e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 29410cb59c99SJosef Bacik btrfs_stop_workers(&fs_info->endio_freespace_worker); 29421cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 294316cdcec7SMiao Xie btrfs_stop_workers(&fs_info->delayed_workers); 2944bab39bf9SJosef Bacik btrfs_stop_workers(&fs_info->caching_workers); 294590519d66SArne Jansen btrfs_stop_workers(&fs_info->readahead_workers); 2946d6bfde87SChris Mason 2947dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 29480b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 2949b248a415SChris Mason 295004160088SChris Mason bdi_destroy(&fs_info->bdi); 295176dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 29520b86a832SChris Mason 29536c41761fSDavid Sterba free_fs_info(fs_info); 295483a4d548SLi Zefan 2955eb60ceacSChris Mason return 0; 2956eb60ceacSChris Mason } 2957eb60ceacSChris Mason 29581259ab75SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) 2959ccd467d6SChris Mason { 29601259ab75SChris Mason int ret; 2961810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 29621259ab75SChris Mason 29632ac55d41SJosef Bacik ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf, 29642ac55d41SJosef Bacik NULL); 29651259ab75SChris Mason if (!ret) 29661259ab75SChris Mason return ret; 29671259ab75SChris Mason 29681259ab75SChris Mason ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, 29691259ab75SChris Mason parent_transid); 29701259ab75SChris Mason return !ret; 29715f39d397SChris Mason } 29726702ed49SChris Mason 29735f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 29745f39d397SChris Mason { 2975810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 2976d1310b2eSChris Mason return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, 29775f39d397SChris Mason buf); 29785f39d397SChris Mason } 29795f39d397SChris Mason 29805f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 29815f39d397SChris Mason { 2982810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 29835f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 29845f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 2985b9473439SChris Mason int was_dirty; 2986b4ce94deSChris Mason 2987b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 2988ccd467d6SChris Mason if (transid != root->fs_info->generation) { 2989d397712bSChris Mason printk(KERN_CRIT "btrfs transid mismatch buffer %llu, " 2990d397712bSChris Mason "found %llu running %llu\n", 2991db94535dSChris Mason (unsigned long long)buf->start, 2992d397712bSChris Mason (unsigned long long)transid, 2993d397712bSChris Mason (unsigned long long)root->fs_info->generation); 2994ccd467d6SChris Mason WARN_ON(1); 2995ccd467d6SChris Mason } 2996b9473439SChris Mason was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 2997b9473439SChris Mason buf); 2998b9473439SChris Mason if (!was_dirty) { 2999b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 3000b9473439SChris Mason root->fs_info->dirty_metadata_bytes += buf->len; 3001b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 3002b9473439SChris Mason } 3003eb60ceacSChris Mason } 3004eb60ceacSChris Mason 3005d3c2fdcfSChris Mason void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 300635b7e476SChris Mason { 3007188de649SChris Mason /* 3008188de649SChris Mason * looks as though older kernels can get into trouble with 3009188de649SChris Mason * this code, they end up stuck in balance_dirty_pages forever 3010188de649SChris Mason */ 3011d6bfde87SChris Mason u64 num_dirty; 3012771ed689SChris Mason unsigned long thresh = 32 * 1024 * 1024; 3013d6bfde87SChris Mason 30146933c02eSJens Axboe if (current->flags & PF_MEMALLOC) 3015d6bfde87SChris Mason return; 3016d6bfde87SChris Mason 301716cdcec7SMiao Xie btrfs_balance_delayed_items(root); 301816cdcec7SMiao Xie 301916cdcec7SMiao Xie num_dirty = root->fs_info->dirty_metadata_bytes; 302016cdcec7SMiao Xie 302116cdcec7SMiao Xie if (num_dirty > thresh) { 302216cdcec7SMiao Xie balance_dirty_pages_ratelimited_nr( 302316cdcec7SMiao Xie root->fs_info->btree_inode->i_mapping, 1); 302416cdcec7SMiao Xie } 302516cdcec7SMiao Xie return; 302616cdcec7SMiao Xie } 302716cdcec7SMiao Xie 302816cdcec7SMiao Xie void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 302916cdcec7SMiao Xie { 303016cdcec7SMiao Xie /* 303116cdcec7SMiao Xie * looks as though older kernels can get into trouble with 303216cdcec7SMiao Xie * this code, they end up stuck in balance_dirty_pages forever 303316cdcec7SMiao Xie */ 303416cdcec7SMiao Xie u64 num_dirty; 303516cdcec7SMiao Xie unsigned long thresh = 32 * 1024 * 1024; 303616cdcec7SMiao Xie 303716cdcec7SMiao Xie if (current->flags & PF_MEMALLOC) 303816cdcec7SMiao Xie return; 303916cdcec7SMiao Xie 3040585ad2c3SChris Mason num_dirty = root->fs_info->dirty_metadata_bytes; 3041585ad2c3SChris Mason 3042d6bfde87SChris Mason if (num_dirty > thresh) { 3043d3c2fdcfSChris Mason balance_dirty_pages_ratelimited_nr( 3044304fced6SChris Mason root->fs_info->btree_inode->i_mapping, 1); 304535b7e476SChris Mason } 3046188de649SChris Mason return; 3047d6bfde87SChris Mason } 30486b80053dSChris Mason 3049ca7a79adSChris Mason int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 30506b80053dSChris Mason { 3051810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 3052ce9adaa5SChris Mason int ret; 3053ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 3054d397712bSChris Mason if (ret == 0) 3055b4ce94deSChris Mason set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); 3056ce9adaa5SChris Mason return ret; 30576b80053dSChris Mason } 30580da5468fSChris Mason 305901d658f2SChris Mason static int btree_lock_page_hook(struct page *page, void *data, 306001d658f2SChris Mason void (*flush_fn)(void *)) 30614bef0848SChris Mason { 30624bef0848SChris Mason struct inode *inode = page->mapping->host; 3063b9473439SChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 30644bef0848SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 30654bef0848SChris Mason struct extent_buffer *eb; 30664bef0848SChris Mason unsigned long len; 30674bef0848SChris Mason u64 bytenr = page_offset(page); 30684bef0848SChris Mason 30694bef0848SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 30704bef0848SChris Mason goto out; 30714bef0848SChris Mason 30724bef0848SChris Mason len = page->private >> 2; 3073f09d1f60SDavid Sterba eb = find_extent_buffer(io_tree, bytenr, len); 30744bef0848SChris Mason if (!eb) 30754bef0848SChris Mason goto out; 30764bef0848SChris Mason 307701d658f2SChris Mason if (!btrfs_try_tree_write_lock(eb)) { 307801d658f2SChris Mason flush_fn(data); 30794bef0848SChris Mason btrfs_tree_lock(eb); 308001d658f2SChris Mason } 30814bef0848SChris Mason btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); 3082b9473439SChris Mason 3083b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { 3084b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 3085b9473439SChris Mason if (root->fs_info->dirty_metadata_bytes >= eb->len) 3086b9473439SChris Mason root->fs_info->dirty_metadata_bytes -= eb->len; 3087b9473439SChris Mason else 3088b9473439SChris Mason WARN_ON(1); 3089b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 3090b9473439SChris Mason } 3091b9473439SChris Mason 30924bef0848SChris Mason btrfs_tree_unlock(eb); 30934bef0848SChris Mason free_extent_buffer(eb); 30944bef0848SChris Mason out: 309501d658f2SChris Mason if (!trylock_page(page)) { 309601d658f2SChris Mason flush_fn(data); 30974bef0848SChris Mason lock_page(page); 309801d658f2SChris Mason } 30994bef0848SChris Mason return 0; 31004bef0848SChris Mason } 31014bef0848SChris Mason 3102acce952bSliubo static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info, 3103acce952bSliubo int read_only) 3104acce952bSliubo { 3105acce952bSliubo if (read_only) 3106acce952bSliubo return; 3107acce952bSliubo 3108acce952bSliubo if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) 3109acce952bSliubo printk(KERN_WARNING "warning: mount fs with errors, " 3110acce952bSliubo "running btrfsck is recommended\n"); 3111acce952bSliubo } 3112acce952bSliubo 3113acce952bSliubo int btrfs_error_commit_super(struct btrfs_root *root) 3114acce952bSliubo { 3115acce952bSliubo int ret; 3116acce952bSliubo 3117acce952bSliubo mutex_lock(&root->fs_info->cleaner_mutex); 3118acce952bSliubo btrfs_run_delayed_iputs(root); 3119acce952bSliubo mutex_unlock(&root->fs_info->cleaner_mutex); 3120acce952bSliubo 3121acce952bSliubo down_write(&root->fs_info->cleanup_work_sem); 3122acce952bSliubo up_write(&root->fs_info->cleanup_work_sem); 3123acce952bSliubo 3124acce952bSliubo /* cleanup FS via transaction */ 3125acce952bSliubo btrfs_cleanup_transaction(root); 3126acce952bSliubo 3127acce952bSliubo ret = write_ctree_super(NULL, root, 0); 3128acce952bSliubo 3129acce952bSliubo return ret; 3130acce952bSliubo } 3131acce952bSliubo 3132acce952bSliubo static int btrfs_destroy_ordered_operations(struct btrfs_root *root) 3133acce952bSliubo { 3134acce952bSliubo struct btrfs_inode *btrfs_inode; 3135acce952bSliubo struct list_head splice; 3136acce952bSliubo 3137acce952bSliubo INIT_LIST_HEAD(&splice); 3138acce952bSliubo 3139acce952bSliubo mutex_lock(&root->fs_info->ordered_operations_mutex); 3140acce952bSliubo spin_lock(&root->fs_info->ordered_extent_lock); 3141acce952bSliubo 3142acce952bSliubo list_splice_init(&root->fs_info->ordered_operations, &splice); 3143acce952bSliubo while (!list_empty(&splice)) { 3144acce952bSliubo btrfs_inode = list_entry(splice.next, struct btrfs_inode, 3145acce952bSliubo ordered_operations); 3146acce952bSliubo 3147acce952bSliubo list_del_init(&btrfs_inode->ordered_operations); 3148acce952bSliubo 3149acce952bSliubo btrfs_invalidate_inodes(btrfs_inode->root); 3150acce952bSliubo } 3151acce952bSliubo 3152acce952bSliubo spin_unlock(&root->fs_info->ordered_extent_lock); 3153acce952bSliubo mutex_unlock(&root->fs_info->ordered_operations_mutex); 3154acce952bSliubo 3155acce952bSliubo return 0; 3156acce952bSliubo } 3157acce952bSliubo 3158acce952bSliubo static int btrfs_destroy_ordered_extents(struct btrfs_root *root) 3159acce952bSliubo { 3160acce952bSliubo struct list_head splice; 3161acce952bSliubo struct btrfs_ordered_extent *ordered; 3162acce952bSliubo struct inode *inode; 3163acce952bSliubo 3164acce952bSliubo INIT_LIST_HEAD(&splice); 3165acce952bSliubo 3166acce952bSliubo spin_lock(&root->fs_info->ordered_extent_lock); 3167acce952bSliubo 3168acce952bSliubo list_splice_init(&root->fs_info->ordered_extents, &splice); 3169acce952bSliubo while (!list_empty(&splice)) { 3170acce952bSliubo ordered = list_entry(splice.next, struct btrfs_ordered_extent, 3171acce952bSliubo root_extent_list); 3172acce952bSliubo 3173acce952bSliubo list_del_init(&ordered->root_extent_list); 3174acce952bSliubo atomic_inc(&ordered->refs); 3175acce952bSliubo 3176acce952bSliubo /* the inode may be getting freed (in sys_unlink path). */ 3177acce952bSliubo inode = igrab(ordered->inode); 3178acce952bSliubo 3179acce952bSliubo spin_unlock(&root->fs_info->ordered_extent_lock); 3180acce952bSliubo if (inode) 3181acce952bSliubo iput(inode); 3182acce952bSliubo 3183acce952bSliubo atomic_set(&ordered->refs, 1); 3184acce952bSliubo btrfs_put_ordered_extent(ordered); 3185acce952bSliubo 3186acce952bSliubo spin_lock(&root->fs_info->ordered_extent_lock); 3187acce952bSliubo } 3188acce952bSliubo 3189acce952bSliubo spin_unlock(&root->fs_info->ordered_extent_lock); 3190acce952bSliubo 3191acce952bSliubo return 0; 3192acce952bSliubo } 3193acce952bSliubo 3194acce952bSliubo static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, 3195acce952bSliubo struct btrfs_root *root) 3196acce952bSliubo { 3197acce952bSliubo struct rb_node *node; 3198acce952bSliubo struct btrfs_delayed_ref_root *delayed_refs; 3199acce952bSliubo struct btrfs_delayed_ref_node *ref; 3200acce952bSliubo int ret = 0; 3201acce952bSliubo 3202acce952bSliubo delayed_refs = &trans->delayed_refs; 3203acce952bSliubo 3204acce952bSliubo spin_lock(&delayed_refs->lock); 3205acce952bSliubo if (delayed_refs->num_entries == 0) { 3206cfece4dbSDavid Sterba spin_unlock(&delayed_refs->lock); 3207acce952bSliubo printk(KERN_INFO "delayed_refs has NO entry\n"); 3208acce952bSliubo return ret; 3209acce952bSliubo } 3210acce952bSliubo 3211acce952bSliubo node = rb_first(&delayed_refs->root); 3212acce952bSliubo while (node) { 3213acce952bSliubo ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); 3214acce952bSliubo node = rb_next(node); 3215acce952bSliubo 3216acce952bSliubo ref->in_tree = 0; 3217acce952bSliubo rb_erase(&ref->rb_node, &delayed_refs->root); 3218acce952bSliubo delayed_refs->num_entries--; 3219acce952bSliubo 3220acce952bSliubo atomic_set(&ref->refs, 1); 3221acce952bSliubo if (btrfs_delayed_ref_is_head(ref)) { 3222acce952bSliubo struct btrfs_delayed_ref_head *head; 3223acce952bSliubo 3224acce952bSliubo head = btrfs_delayed_node_to_head(ref); 3225acce952bSliubo mutex_lock(&head->mutex); 3226acce952bSliubo kfree(head->extent_op); 3227acce952bSliubo delayed_refs->num_heads--; 3228acce952bSliubo if (list_empty(&head->cluster)) 3229acce952bSliubo delayed_refs->num_heads_ready--; 3230acce952bSliubo list_del_init(&head->cluster); 3231acce952bSliubo mutex_unlock(&head->mutex); 3232acce952bSliubo } 3233acce952bSliubo 3234acce952bSliubo spin_unlock(&delayed_refs->lock); 3235acce952bSliubo btrfs_put_delayed_ref(ref); 3236acce952bSliubo 3237acce952bSliubo cond_resched(); 3238acce952bSliubo spin_lock(&delayed_refs->lock); 3239acce952bSliubo } 3240acce952bSliubo 3241acce952bSliubo spin_unlock(&delayed_refs->lock); 3242acce952bSliubo 3243acce952bSliubo return ret; 3244acce952bSliubo } 3245acce952bSliubo 3246acce952bSliubo static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t) 3247acce952bSliubo { 3248acce952bSliubo struct btrfs_pending_snapshot *snapshot; 3249acce952bSliubo struct list_head splice; 3250acce952bSliubo 3251acce952bSliubo INIT_LIST_HEAD(&splice); 3252acce952bSliubo 3253acce952bSliubo list_splice_init(&t->pending_snapshots, &splice); 3254acce952bSliubo 3255acce952bSliubo while (!list_empty(&splice)) { 3256acce952bSliubo snapshot = list_entry(splice.next, 3257acce952bSliubo struct btrfs_pending_snapshot, 3258acce952bSliubo list); 3259acce952bSliubo 3260acce952bSliubo list_del_init(&snapshot->list); 3261acce952bSliubo 3262acce952bSliubo kfree(snapshot); 3263acce952bSliubo } 3264acce952bSliubo 3265acce952bSliubo return 0; 3266acce952bSliubo } 3267acce952bSliubo 3268acce952bSliubo static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root) 3269acce952bSliubo { 3270acce952bSliubo struct btrfs_inode *btrfs_inode; 3271acce952bSliubo struct list_head splice; 3272acce952bSliubo 3273acce952bSliubo INIT_LIST_HEAD(&splice); 3274acce952bSliubo 3275acce952bSliubo spin_lock(&root->fs_info->delalloc_lock); 32765be76758SDavid Sterba list_splice_init(&root->fs_info->delalloc_inodes, &splice); 3277acce952bSliubo 3278acce952bSliubo while (!list_empty(&splice)) { 3279acce952bSliubo btrfs_inode = list_entry(splice.next, struct btrfs_inode, 3280acce952bSliubo delalloc_inodes); 3281acce952bSliubo 3282acce952bSliubo list_del_init(&btrfs_inode->delalloc_inodes); 3283acce952bSliubo 3284acce952bSliubo btrfs_invalidate_inodes(btrfs_inode->root); 3285acce952bSliubo } 3286acce952bSliubo 3287acce952bSliubo spin_unlock(&root->fs_info->delalloc_lock); 3288acce952bSliubo 3289acce952bSliubo return 0; 3290acce952bSliubo } 3291acce952bSliubo 3292acce952bSliubo static int btrfs_destroy_marked_extents(struct btrfs_root *root, 3293acce952bSliubo struct extent_io_tree *dirty_pages, 3294acce952bSliubo int mark) 3295acce952bSliubo { 3296acce952bSliubo int ret; 3297acce952bSliubo struct page *page; 3298acce952bSliubo struct inode *btree_inode = root->fs_info->btree_inode; 3299acce952bSliubo struct extent_buffer *eb; 3300acce952bSliubo u64 start = 0; 3301acce952bSliubo u64 end; 3302acce952bSliubo u64 offset; 3303acce952bSliubo unsigned long index; 3304acce952bSliubo 3305acce952bSliubo while (1) { 3306acce952bSliubo ret = find_first_extent_bit(dirty_pages, start, &start, &end, 3307acce952bSliubo mark); 3308acce952bSliubo if (ret) 3309acce952bSliubo break; 3310acce952bSliubo 3311acce952bSliubo clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); 3312acce952bSliubo while (start <= end) { 3313acce952bSliubo index = start >> PAGE_CACHE_SHIFT; 3314acce952bSliubo start = (u64)(index + 1) << PAGE_CACHE_SHIFT; 3315acce952bSliubo page = find_get_page(btree_inode->i_mapping, index); 3316acce952bSliubo if (!page) 3317acce952bSliubo continue; 3318acce952bSliubo offset = page_offset(page); 3319acce952bSliubo 3320acce952bSliubo spin_lock(&dirty_pages->buffer_lock); 3321acce952bSliubo eb = radix_tree_lookup( 3322acce952bSliubo &(&BTRFS_I(page->mapping->host)->io_tree)->buffer, 3323acce952bSliubo offset >> PAGE_CACHE_SHIFT); 3324acce952bSliubo spin_unlock(&dirty_pages->buffer_lock); 3325acce952bSliubo if (eb) { 3326acce952bSliubo ret = test_and_clear_bit(EXTENT_BUFFER_DIRTY, 3327acce952bSliubo &eb->bflags); 3328acce952bSliubo atomic_set(&eb->refs, 1); 3329acce952bSliubo } 3330acce952bSliubo if (PageWriteback(page)) 3331acce952bSliubo end_page_writeback(page); 3332acce952bSliubo 3333acce952bSliubo lock_page(page); 3334acce952bSliubo if (PageDirty(page)) { 3335acce952bSliubo clear_page_dirty_for_io(page); 3336acce952bSliubo spin_lock_irq(&page->mapping->tree_lock); 3337acce952bSliubo radix_tree_tag_clear(&page->mapping->page_tree, 3338acce952bSliubo page_index(page), 3339acce952bSliubo PAGECACHE_TAG_DIRTY); 3340acce952bSliubo spin_unlock_irq(&page->mapping->tree_lock); 3341acce952bSliubo } 3342acce952bSliubo 3343acce952bSliubo page->mapping->a_ops->invalidatepage(page, 0); 3344acce952bSliubo unlock_page(page); 3345acce952bSliubo } 3346acce952bSliubo } 3347acce952bSliubo 3348acce952bSliubo return ret; 3349acce952bSliubo } 3350acce952bSliubo 3351acce952bSliubo static int btrfs_destroy_pinned_extent(struct btrfs_root *root, 3352acce952bSliubo struct extent_io_tree *pinned_extents) 3353acce952bSliubo { 3354acce952bSliubo struct extent_io_tree *unpin; 3355acce952bSliubo u64 start; 3356acce952bSliubo u64 end; 3357acce952bSliubo int ret; 3358acce952bSliubo 3359acce952bSliubo unpin = pinned_extents; 3360acce952bSliubo while (1) { 3361acce952bSliubo ret = find_first_extent_bit(unpin, 0, &start, &end, 3362acce952bSliubo EXTENT_DIRTY); 3363acce952bSliubo if (ret) 3364acce952bSliubo break; 3365acce952bSliubo 3366acce952bSliubo /* opt_discard */ 33675378e607SLi Dongyang if (btrfs_test_opt(root, DISCARD)) 33685378e607SLi Dongyang ret = btrfs_error_discard_extent(root, start, 33695378e607SLi Dongyang end + 1 - start, 33705378e607SLi Dongyang NULL); 3371acce952bSliubo 3372acce952bSliubo clear_extent_dirty(unpin, start, end, GFP_NOFS); 3373acce952bSliubo btrfs_error_unpin_extent_range(root, start, end); 3374acce952bSliubo cond_resched(); 3375acce952bSliubo } 3376acce952bSliubo 3377acce952bSliubo return 0; 3378acce952bSliubo } 3379acce952bSliubo 3380acce952bSliubo static int btrfs_cleanup_transaction(struct btrfs_root *root) 3381acce952bSliubo { 3382acce952bSliubo struct btrfs_transaction *t; 3383acce952bSliubo LIST_HEAD(list); 3384acce952bSliubo 3385acce952bSliubo WARN_ON(1); 3386acce952bSliubo 3387acce952bSliubo mutex_lock(&root->fs_info->transaction_kthread_mutex); 3388acce952bSliubo 3389a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 3390acce952bSliubo list_splice_init(&root->fs_info->trans_list, &list); 3391a4abeea4SJosef Bacik root->fs_info->trans_no_join = 1; 3392a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 3393a4abeea4SJosef Bacik 3394acce952bSliubo while (!list_empty(&list)) { 3395acce952bSliubo t = list_entry(list.next, struct btrfs_transaction, list); 3396acce952bSliubo if (!t) 3397acce952bSliubo break; 3398acce952bSliubo 3399acce952bSliubo btrfs_destroy_ordered_operations(root); 3400acce952bSliubo 3401acce952bSliubo btrfs_destroy_ordered_extents(root); 3402acce952bSliubo 3403acce952bSliubo btrfs_destroy_delayed_refs(t, root); 3404acce952bSliubo 3405acce952bSliubo btrfs_block_rsv_release(root, 3406acce952bSliubo &root->fs_info->trans_block_rsv, 3407acce952bSliubo t->dirty_pages.dirty_bytes); 3408acce952bSliubo 3409acce952bSliubo /* FIXME: cleanup wait for commit */ 3410acce952bSliubo t->in_commit = 1; 3411acce952bSliubo t->blocked = 1; 3412acce952bSliubo if (waitqueue_active(&root->fs_info->transaction_blocked_wait)) 3413acce952bSliubo wake_up(&root->fs_info->transaction_blocked_wait); 3414acce952bSliubo 3415acce952bSliubo t->blocked = 0; 3416acce952bSliubo if (waitqueue_active(&root->fs_info->transaction_wait)) 3417acce952bSliubo wake_up(&root->fs_info->transaction_wait); 3418acce952bSliubo 3419acce952bSliubo t->commit_done = 1; 3420acce952bSliubo if (waitqueue_active(&t->commit_wait)) 3421acce952bSliubo wake_up(&t->commit_wait); 3422acce952bSliubo 3423acce952bSliubo btrfs_destroy_pending_snapshots(t); 3424acce952bSliubo 3425acce952bSliubo btrfs_destroy_delalloc_inodes(root); 3426acce952bSliubo 3427a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 3428acce952bSliubo root->fs_info->running_transaction = NULL; 3429a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 3430acce952bSliubo 3431acce952bSliubo btrfs_destroy_marked_extents(root, &t->dirty_pages, 3432acce952bSliubo EXTENT_DIRTY); 3433acce952bSliubo 3434acce952bSliubo btrfs_destroy_pinned_extent(root, 3435acce952bSliubo root->fs_info->pinned_extents); 3436acce952bSliubo 343713c5a93eSJosef Bacik atomic_set(&t->use_count, 0); 3438acce952bSliubo list_del_init(&t->list); 3439acce952bSliubo memset(t, 0, sizeof(*t)); 3440acce952bSliubo kmem_cache_free(btrfs_transaction_cachep, t); 3441acce952bSliubo } 3442acce952bSliubo 3443a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 3444a4abeea4SJosef Bacik root->fs_info->trans_no_join = 0; 3445a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 3446acce952bSliubo mutex_unlock(&root->fs_info->transaction_kthread_mutex); 3447acce952bSliubo 3448acce952bSliubo return 0; 3449acce952bSliubo } 3450acce952bSliubo 3451d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops = { 34524bef0848SChris Mason .write_cache_pages_lock_hook = btree_lock_page_hook, 3453ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 34544bb31e92SArne Jansen .readpage_io_failed_hook = btree_io_failed_hook, 34550b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 3456239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 3457239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 34580da5468fSChris Mason }; 3459