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) { 369f188591eSChris Mason ret = read_extent_buffer_pages(io_tree, eb, start, 1, 370f188591eSChris Mason btree_get_extent, mirror_num); 3711259ab75SChris Mason if (!ret && 3721259ab75SChris Mason !verify_parent_transid(io_tree, eb, parent_transid)) 373f188591eSChris Mason return ret; 374d397712bSChris Mason 375a826d6dcSJosef Bacik /* 376a826d6dcSJosef Bacik * This buffer's crc is fine, but its contents are corrupted, so 377a826d6dcSJosef Bacik * there is no reason to read the other copies, they won't be 378a826d6dcSJosef Bacik * any less wrong. 379a826d6dcSJosef Bacik */ 380a826d6dcSJosef Bacik if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags)) 381a826d6dcSJosef Bacik return ret; 382a826d6dcSJosef Bacik 383f188591eSChris Mason num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, 384f188591eSChris Mason eb->start, eb->len); 3854235298eSChris Mason if (num_copies == 1) 386f188591eSChris Mason return ret; 3874235298eSChris Mason 388f188591eSChris Mason mirror_num++; 3894235298eSChris Mason if (mirror_num > num_copies) 390f188591eSChris Mason return ret; 391f188591eSChris Mason } 392f188591eSChris Mason return -EIO; 393f188591eSChris Mason } 39419c00ddcSChris Mason 395d352ac68SChris Mason /* 396d397712bSChris Mason * checksum a dirty tree block before IO. This has extra checks to make sure 397d397712bSChris Mason * we only fill in the checksum field in the first page of a multi-page block 398d352ac68SChris Mason */ 399d397712bSChris Mason 400b2950863SChristoph Hellwig static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) 40119c00ddcSChris Mason { 402d1310b2eSChris Mason struct extent_io_tree *tree; 40335ebb934SChris Mason u64 start = (u64)page->index << PAGE_CACHE_SHIFT; 40419c00ddcSChris Mason u64 found_start; 40519c00ddcSChris Mason unsigned long len; 40619c00ddcSChris Mason struct extent_buffer *eb; 407f188591eSChris Mason int ret; 408f188591eSChris Mason 409d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 41019c00ddcSChris Mason 411eb14ab8eSChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 412eb14ab8eSChris Mason WARN_ON(1); 41319c00ddcSChris Mason goto out; 414eb14ab8eSChris Mason } 415eb14ab8eSChris Mason if (!page->private) { 416eb14ab8eSChris Mason WARN_ON(1); 41719c00ddcSChris Mason goto out; 418eb14ab8eSChris Mason } 41919c00ddcSChris Mason len = page->private >> 2; 420d397712bSChris Mason WARN_ON(len == 0); 421d397712bSChris Mason 422ba144192SDavid Sterba eb = alloc_extent_buffer(tree, start, len, page); 42391ca338dSTsutomu Itoh if (eb == NULL) { 42491ca338dSTsutomu Itoh WARN_ON(1); 42591ca338dSTsutomu Itoh goto out; 42691ca338dSTsutomu Itoh } 427ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, 428ca7a79adSChris Mason btrfs_header_generation(eb)); 429f188591eSChris Mason BUG_ON(ret); 430784b4e29SChris Mason WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN)); 431784b4e29SChris Mason 43219c00ddcSChris Mason found_start = btrfs_header_bytenr(eb); 43319c00ddcSChris Mason if (found_start != start) { 43455c69072SChris Mason WARN_ON(1); 43555c69072SChris Mason goto err; 43655c69072SChris Mason } 43755c69072SChris Mason if (eb->first_page != page) { 43855c69072SChris Mason WARN_ON(1); 43955c69072SChris Mason goto err; 44055c69072SChris Mason } 44155c69072SChris Mason if (!PageUptodate(page)) { 44255c69072SChris Mason WARN_ON(1); 44355c69072SChris Mason goto err; 44419c00ddcSChris Mason } 44519c00ddcSChris Mason csum_tree_block(root, eb, 0); 44655c69072SChris Mason err: 44719c00ddcSChris Mason free_extent_buffer(eb); 44819c00ddcSChris Mason out: 44919c00ddcSChris Mason return 0; 45019c00ddcSChris Mason } 45119c00ddcSChris Mason 4522b82032cSYan Zheng static int check_tree_block_fsid(struct btrfs_root *root, 4532b82032cSYan Zheng struct extent_buffer *eb) 4542b82032cSYan Zheng { 4552b82032cSYan Zheng struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 4562b82032cSYan Zheng u8 fsid[BTRFS_UUID_SIZE]; 4572b82032cSYan Zheng int ret = 1; 4582b82032cSYan Zheng 4592b82032cSYan Zheng read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), 4602b82032cSYan Zheng BTRFS_FSID_SIZE); 4612b82032cSYan Zheng while (fs_devices) { 4622b82032cSYan Zheng if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { 4632b82032cSYan Zheng ret = 0; 4642b82032cSYan Zheng break; 4652b82032cSYan Zheng } 4662b82032cSYan Zheng fs_devices = fs_devices->seed; 4672b82032cSYan Zheng } 4682b82032cSYan Zheng return ret; 4692b82032cSYan Zheng } 4702b82032cSYan Zheng 471a826d6dcSJosef Bacik #define CORRUPT(reason, eb, root, slot) \ 472a826d6dcSJosef Bacik printk(KERN_CRIT "btrfs: corrupt leaf, %s: block=%llu," \ 473a826d6dcSJosef Bacik "root=%llu, slot=%d\n", reason, \ 474a826d6dcSJosef Bacik (unsigned long long)btrfs_header_bytenr(eb), \ 475a826d6dcSJosef Bacik (unsigned long long)root->objectid, slot) 476a826d6dcSJosef Bacik 477a826d6dcSJosef Bacik static noinline int check_leaf(struct btrfs_root *root, 478a826d6dcSJosef Bacik struct extent_buffer *leaf) 479a826d6dcSJosef Bacik { 480a826d6dcSJosef Bacik struct btrfs_key key; 481a826d6dcSJosef Bacik struct btrfs_key leaf_key; 482a826d6dcSJosef Bacik u32 nritems = btrfs_header_nritems(leaf); 483a826d6dcSJosef Bacik int slot; 484a826d6dcSJosef Bacik 485a826d6dcSJosef Bacik if (nritems == 0) 486a826d6dcSJosef Bacik return 0; 487a826d6dcSJosef Bacik 488a826d6dcSJosef Bacik /* Check the 0 item */ 489a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) != 490a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 491a826d6dcSJosef Bacik CORRUPT("invalid item offset size pair", leaf, root, 0); 492a826d6dcSJosef Bacik return -EIO; 493a826d6dcSJosef Bacik } 494a826d6dcSJosef Bacik 495a826d6dcSJosef Bacik /* 496a826d6dcSJosef Bacik * Check to make sure each items keys are in the correct order and their 497a826d6dcSJosef Bacik * offsets make sense. We only have to loop through nritems-1 because 498a826d6dcSJosef Bacik * we check the current slot against the next slot, which verifies the 499a826d6dcSJosef Bacik * next slot's offset+size makes sense and that the current's slot 500a826d6dcSJosef Bacik * offset is correct. 501a826d6dcSJosef Bacik */ 502a826d6dcSJosef Bacik for (slot = 0; slot < nritems - 1; slot++) { 503a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &leaf_key, slot); 504a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &key, slot + 1); 505a826d6dcSJosef Bacik 506a826d6dcSJosef Bacik /* Make sure the keys are in the right order */ 507a826d6dcSJosef Bacik if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) { 508a826d6dcSJosef Bacik CORRUPT("bad key order", leaf, root, slot); 509a826d6dcSJosef Bacik return -EIO; 510a826d6dcSJosef Bacik } 511a826d6dcSJosef Bacik 512a826d6dcSJosef Bacik /* 513a826d6dcSJosef Bacik * Make sure the offset and ends are right, remember that the 514a826d6dcSJosef Bacik * item data starts at the end of the leaf and grows towards the 515a826d6dcSJosef Bacik * front. 516a826d6dcSJosef Bacik */ 517a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, slot) != 518a826d6dcSJosef Bacik btrfs_item_end_nr(leaf, slot + 1)) { 519a826d6dcSJosef Bacik CORRUPT("slot offset bad", leaf, root, slot); 520a826d6dcSJosef Bacik return -EIO; 521a826d6dcSJosef Bacik } 522a826d6dcSJosef Bacik 523a826d6dcSJosef Bacik /* 524a826d6dcSJosef Bacik * Check to make sure that we don't point outside of the leaf, 525a826d6dcSJosef Bacik * just incase all the items are consistent to eachother, but 526a826d6dcSJosef Bacik * all point outside of the leaf. 527a826d6dcSJosef Bacik */ 528a826d6dcSJosef Bacik if (btrfs_item_end_nr(leaf, slot) > 529a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 530a826d6dcSJosef Bacik CORRUPT("slot end outside of leaf", leaf, root, slot); 531a826d6dcSJosef Bacik return -EIO; 532a826d6dcSJosef Bacik } 533a826d6dcSJosef Bacik } 534a826d6dcSJosef Bacik 535a826d6dcSJosef Bacik return 0; 536a826d6dcSJosef Bacik } 537a826d6dcSJosef Bacik 538b2950863SChristoph Hellwig static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, 539ce9adaa5SChris Mason struct extent_state *state) 540ce9adaa5SChris Mason { 541ce9adaa5SChris Mason struct extent_io_tree *tree; 542ce9adaa5SChris Mason u64 found_start; 543ce9adaa5SChris Mason int found_level; 544ce9adaa5SChris Mason unsigned long len; 545ce9adaa5SChris Mason struct extent_buffer *eb; 546ce9adaa5SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 547f188591eSChris Mason int ret = 0; 548ce9adaa5SChris Mason 549ce9adaa5SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 550ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 551ce9adaa5SChris Mason goto out; 552ce9adaa5SChris Mason if (!page->private) 553ce9adaa5SChris Mason goto out; 554d397712bSChris Mason 555ce9adaa5SChris Mason len = page->private >> 2; 556d397712bSChris Mason WARN_ON(len == 0); 557d397712bSChris Mason 558ba144192SDavid Sterba eb = alloc_extent_buffer(tree, start, len, page); 55991ca338dSTsutomu Itoh if (eb == NULL) { 56091ca338dSTsutomu Itoh ret = -EIO; 56191ca338dSTsutomu Itoh goto out; 56291ca338dSTsutomu Itoh } 563f188591eSChris Mason 564ce9adaa5SChris Mason found_start = btrfs_header_bytenr(eb); 56523a07867SChris Mason if (found_start != start) { 5667a36ddecSDavid Sterba printk_ratelimited(KERN_INFO "btrfs bad tree block start " 567193f284dSChris Mason "%llu %llu\n", 568a1b32a59SChris Mason (unsigned long long)found_start, 569a1b32a59SChris Mason (unsigned long long)eb->start); 570f188591eSChris Mason ret = -EIO; 571ce9adaa5SChris Mason goto err; 572ce9adaa5SChris Mason } 573ce9adaa5SChris Mason if (eb->first_page != page) { 574d397712bSChris Mason printk(KERN_INFO "btrfs bad first page %lu %lu\n", 575d397712bSChris Mason eb->first_page->index, page->index); 576ce9adaa5SChris Mason WARN_ON(1); 577f188591eSChris Mason ret = -EIO; 578ce9adaa5SChris Mason goto err; 579ce9adaa5SChris Mason } 5802b82032cSYan Zheng if (check_tree_block_fsid(root, eb)) { 5817a36ddecSDavid Sterba printk_ratelimited(KERN_INFO "btrfs bad fsid on block %llu\n", 582d397712bSChris Mason (unsigned long long)eb->start); 5831259ab75SChris Mason ret = -EIO; 5841259ab75SChris Mason goto err; 5851259ab75SChris Mason } 586ce9adaa5SChris Mason found_level = btrfs_header_level(eb); 587ce9adaa5SChris Mason 58885d4e461SChris Mason btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), 58985d4e461SChris Mason eb, found_level); 5904008c04aSChris Mason 591ce9adaa5SChris Mason ret = csum_tree_block(root, eb, 1); 592a826d6dcSJosef Bacik if (ret) { 593f188591eSChris Mason ret = -EIO; 594a826d6dcSJosef Bacik goto err; 595a826d6dcSJosef Bacik } 596a826d6dcSJosef Bacik 597a826d6dcSJosef Bacik /* 598a826d6dcSJosef Bacik * If this is a leaf block and it is corrupt, set the corrupt bit so 599a826d6dcSJosef Bacik * that we don't try and read the other copies of this block, just 600a826d6dcSJosef Bacik * return -EIO. 601a826d6dcSJosef Bacik */ 602a826d6dcSJosef Bacik if (found_level == 0 && check_leaf(root, eb)) { 603a826d6dcSJosef Bacik set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); 604a826d6dcSJosef Bacik ret = -EIO; 605a826d6dcSJosef Bacik } 606ce9adaa5SChris Mason 607ce9adaa5SChris Mason end = min_t(u64, eb->len, PAGE_CACHE_SIZE); 608ce9adaa5SChris Mason end = eb->start + end - 1; 609ce9adaa5SChris Mason err: 610ce9adaa5SChris Mason free_extent_buffer(eb); 611ce9adaa5SChris Mason out: 612f188591eSChris Mason return ret; 613ce9adaa5SChris Mason } 614ce9adaa5SChris Mason 615ce9adaa5SChris Mason static void end_workqueue_bio(struct bio *bio, int err) 616ce9adaa5SChris Mason { 617ce9adaa5SChris Mason struct end_io_wq *end_io_wq = bio->bi_private; 618ce9adaa5SChris Mason struct btrfs_fs_info *fs_info; 619ce9adaa5SChris Mason 620ce9adaa5SChris Mason fs_info = end_io_wq->info; 621ce9adaa5SChris Mason end_io_wq->error = err; 6228b712842SChris Mason end_io_wq->work.func = end_workqueue_fn; 6238b712842SChris Mason end_io_wq->work.flags = 0; 624d20f7043SChris Mason 6257b6d91daSChristoph Hellwig if (bio->bi_rw & REQ_WRITE) { 6260cb59c99SJosef Bacik if (end_io_wq->metadata == 1) 627cad321adSChris Mason btrfs_queue_worker(&fs_info->endio_meta_write_workers, 628cad321adSChris Mason &end_io_wq->work); 6290cb59c99SJosef Bacik else if (end_io_wq->metadata == 2) 6300cb59c99SJosef Bacik btrfs_queue_worker(&fs_info->endio_freespace_worker, 6310cb59c99SJosef Bacik &end_io_wq->work); 632cad321adSChris Mason else 633e6dcd2dcSChris Mason btrfs_queue_worker(&fs_info->endio_write_workers, 634e6dcd2dcSChris Mason &end_io_wq->work); 635d20f7043SChris Mason } else { 636d20f7043SChris Mason if (end_io_wq->metadata) 637d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_meta_workers, 638d20f7043SChris Mason &end_io_wq->work); 639e6dcd2dcSChris Mason else 640d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_workers, 641d20f7043SChris Mason &end_io_wq->work); 642d20f7043SChris Mason } 643ce9adaa5SChris Mason } 644ce9adaa5SChris Mason 6450cb59c99SJosef Bacik /* 6460cb59c99SJosef Bacik * For the metadata arg you want 6470cb59c99SJosef Bacik * 6480cb59c99SJosef Bacik * 0 - if data 6490cb59c99SJosef Bacik * 1 - if normal metadta 6500cb59c99SJosef Bacik * 2 - if writing to the free space cache area 6510cb59c99SJosef Bacik */ 65222c59948SChris Mason int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 65322c59948SChris Mason int metadata) 6540b86a832SChris Mason { 655ce9adaa5SChris Mason struct end_io_wq *end_io_wq; 656ce9adaa5SChris Mason end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); 657ce9adaa5SChris Mason if (!end_io_wq) 658ce9adaa5SChris Mason return -ENOMEM; 659ce9adaa5SChris Mason 660ce9adaa5SChris Mason end_io_wq->private = bio->bi_private; 661ce9adaa5SChris Mason end_io_wq->end_io = bio->bi_end_io; 66222c59948SChris Mason end_io_wq->info = info; 663ce9adaa5SChris Mason end_io_wq->error = 0; 664ce9adaa5SChris Mason end_io_wq->bio = bio; 66522c59948SChris Mason end_io_wq->metadata = metadata; 666ce9adaa5SChris Mason 667ce9adaa5SChris Mason bio->bi_private = end_io_wq; 668ce9adaa5SChris Mason bio->bi_end_io = end_workqueue_bio; 66922c59948SChris Mason return 0; 67022c59948SChris Mason } 67122c59948SChris Mason 672b64a2851SChris Mason unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) 6734854ddd0SChris Mason { 6744854ddd0SChris Mason unsigned long limit = min_t(unsigned long, 6754854ddd0SChris Mason info->workers.max_workers, 6764854ddd0SChris Mason info->fs_devices->open_devices); 6774854ddd0SChris Mason return 256 * limit; 6784854ddd0SChris Mason } 6794854ddd0SChris Mason 6804a69a410SChris Mason static void run_one_async_start(struct btrfs_work *work) 6814a69a410SChris Mason { 6824a69a410SChris Mason struct async_submit_bio *async; 6834a69a410SChris Mason 6844a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 6854a69a410SChris Mason async->submit_bio_start(async->inode, async->rw, async->bio, 686eaf25d93SChris Mason async->mirror_num, async->bio_flags, 687eaf25d93SChris Mason async->bio_offset); 6884a69a410SChris Mason } 6894a69a410SChris Mason 6904a69a410SChris Mason static void run_one_async_done(struct btrfs_work *work) 6918b712842SChris Mason { 6928b712842SChris Mason struct btrfs_fs_info *fs_info; 6938b712842SChris Mason struct async_submit_bio *async; 6944854ddd0SChris Mason int limit; 6958b712842SChris Mason 6968b712842SChris Mason async = container_of(work, struct async_submit_bio, work); 6978b712842SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 6984854ddd0SChris Mason 699b64a2851SChris Mason limit = btrfs_async_submit_limit(fs_info); 7004854ddd0SChris Mason limit = limit * 2 / 3; 7014854ddd0SChris Mason 7028b712842SChris Mason atomic_dec(&fs_info->nr_async_submits); 7030986fe9eSChris Mason 704b64a2851SChris Mason if (atomic_read(&fs_info->nr_async_submits) < limit && 705b64a2851SChris Mason waitqueue_active(&fs_info->async_submit_wait)) 7064854ddd0SChris Mason wake_up(&fs_info->async_submit_wait); 7074854ddd0SChris Mason 7084a69a410SChris Mason async->submit_bio_done(async->inode, async->rw, async->bio, 709eaf25d93SChris Mason async->mirror_num, async->bio_flags, 710eaf25d93SChris Mason async->bio_offset); 7114a69a410SChris Mason } 7124a69a410SChris Mason 7134a69a410SChris Mason static void run_one_async_free(struct btrfs_work *work) 7144a69a410SChris Mason { 7154a69a410SChris Mason struct async_submit_bio *async; 7164a69a410SChris Mason 7174a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 7188b712842SChris Mason kfree(async); 7198b712842SChris Mason } 7208b712842SChris Mason 72144b8bd7eSChris Mason int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 72244b8bd7eSChris Mason int rw, struct bio *bio, int mirror_num, 723c8b97818SChris Mason unsigned long bio_flags, 724eaf25d93SChris Mason u64 bio_offset, 7254a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start, 7264a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done) 72744b8bd7eSChris Mason { 72844b8bd7eSChris Mason struct async_submit_bio *async; 72944b8bd7eSChris Mason 73044b8bd7eSChris Mason async = kmalloc(sizeof(*async), GFP_NOFS); 73144b8bd7eSChris Mason if (!async) 73244b8bd7eSChris Mason return -ENOMEM; 73344b8bd7eSChris Mason 73444b8bd7eSChris Mason async->inode = inode; 73544b8bd7eSChris Mason async->rw = rw; 73644b8bd7eSChris Mason async->bio = bio; 73744b8bd7eSChris Mason async->mirror_num = mirror_num; 7384a69a410SChris Mason async->submit_bio_start = submit_bio_start; 7394a69a410SChris Mason async->submit_bio_done = submit_bio_done; 7404a69a410SChris Mason 7414a69a410SChris Mason async->work.func = run_one_async_start; 7424a69a410SChris Mason async->work.ordered_func = run_one_async_done; 7434a69a410SChris Mason async->work.ordered_free = run_one_async_free; 7444a69a410SChris Mason 7458b712842SChris Mason async->work.flags = 0; 746c8b97818SChris Mason async->bio_flags = bio_flags; 747eaf25d93SChris Mason async->bio_offset = bio_offset; 7488c8bee1dSChris Mason 749cb03c743SChris Mason atomic_inc(&fs_info->nr_async_submits); 750d313d7a3SChris Mason 7517b6d91daSChristoph Hellwig if (rw & REQ_SYNC) 752d313d7a3SChris Mason btrfs_set_work_high_prio(&async->work); 753d313d7a3SChris Mason 7548b712842SChris Mason btrfs_queue_worker(&fs_info->workers, &async->work); 7559473f16cSChris Mason 756771ed689SChris Mason while (atomic_read(&fs_info->async_submit_draining) && 757771ed689SChris Mason atomic_read(&fs_info->nr_async_submits)) { 758771ed689SChris Mason wait_event(fs_info->async_submit_wait, 759771ed689SChris Mason (atomic_read(&fs_info->nr_async_submits) == 0)); 760771ed689SChris Mason } 761771ed689SChris Mason 76244b8bd7eSChris Mason return 0; 76344b8bd7eSChris Mason } 76444b8bd7eSChris Mason 765ce3ed71aSChris Mason static int btree_csum_one_bio(struct bio *bio) 766ce3ed71aSChris Mason { 767ce3ed71aSChris Mason struct bio_vec *bvec = bio->bi_io_vec; 768ce3ed71aSChris Mason int bio_index = 0; 769ce3ed71aSChris Mason struct btrfs_root *root; 770ce3ed71aSChris Mason 771ce3ed71aSChris Mason WARN_ON(bio->bi_vcnt <= 0); 772ce3ed71aSChris Mason while (bio_index < bio->bi_vcnt) { 773ce3ed71aSChris Mason root = BTRFS_I(bvec->bv_page->mapping->host)->root; 774ce3ed71aSChris Mason csum_dirty_buffer(root, bvec->bv_page); 775ce3ed71aSChris Mason bio_index++; 776ce3ed71aSChris Mason bvec++; 777ce3ed71aSChris Mason } 778ce3ed71aSChris Mason return 0; 779ce3ed71aSChris Mason } 780ce3ed71aSChris Mason 7814a69a410SChris Mason static int __btree_submit_bio_start(struct inode *inode, int rw, 7824a69a410SChris Mason struct bio *bio, int mirror_num, 783eaf25d93SChris Mason unsigned long bio_flags, 784eaf25d93SChris Mason u64 bio_offset) 78522c59948SChris Mason { 7868b712842SChris Mason /* 7878b712842SChris Mason * when we're called for a write, we're already in the async 7885443be45SChris Mason * submission context. Just jump into btrfs_map_bio 7898b712842SChris Mason */ 790ce3ed71aSChris Mason btree_csum_one_bio(bio); 7914a69a410SChris Mason return 0; 79222c59948SChris Mason } 79322c59948SChris Mason 7944a69a410SChris Mason static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, 795eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 796eaf25d93SChris Mason u64 bio_offset) 7974a69a410SChris Mason { 7988b712842SChris Mason /* 7994a69a410SChris Mason * when we're called for a write, we're already in the async 8004a69a410SChris Mason * submission context. Just jump into btrfs_map_bio 8018b712842SChris Mason */ 8028b712842SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); 8030b86a832SChris Mason } 8040b86a832SChris Mason 80544b8bd7eSChris Mason static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 806eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 807eaf25d93SChris Mason u64 bio_offset) 80844b8bd7eSChris Mason { 8094a69a410SChris Mason int ret; 810cad321adSChris Mason 8114a69a410SChris Mason ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, 8124a69a410SChris Mason bio, 1); 8134a69a410SChris Mason BUG_ON(ret); 8144a69a410SChris Mason 8157b6d91daSChristoph Hellwig if (!(rw & REQ_WRITE)) { 816cad321adSChris Mason /* 817cad321adSChris Mason * called for a read, do the setup so that checksum validation 818cad321adSChris Mason * can happen in the async kernel threads 819cad321adSChris Mason */ 8204a69a410SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 8216f3577bdSChris Mason mirror_num, 0); 82244b8bd7eSChris Mason } 823d313d7a3SChris Mason 824cad321adSChris Mason /* 825cad321adSChris Mason * kthread helpers are used to submit writes so that checksumming 826cad321adSChris Mason * can happen in parallel across all CPUs 827cad321adSChris Mason */ 82844b8bd7eSChris Mason return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, 829c8b97818SChris Mason inode, rw, bio, mirror_num, 0, 830eaf25d93SChris Mason bio_offset, 8314a69a410SChris Mason __btree_submit_bio_start, 8324a69a410SChris Mason __btree_submit_bio_done); 83344b8bd7eSChris Mason } 83444b8bd7eSChris Mason 8353dd1462eSJan Beulich #ifdef CONFIG_MIGRATION 836784b4e29SChris Mason static int btree_migratepage(struct address_space *mapping, 837784b4e29SChris Mason struct page *newpage, struct page *page) 838784b4e29SChris Mason { 839784b4e29SChris Mason /* 840784b4e29SChris Mason * we can't safely write a btree page from here, 841784b4e29SChris Mason * we haven't done the locking hook 842784b4e29SChris Mason */ 843784b4e29SChris Mason if (PageDirty(page)) 844784b4e29SChris Mason return -EAGAIN; 845784b4e29SChris Mason /* 846784b4e29SChris Mason * Buffers may be managed in a filesystem specific way. 847784b4e29SChris Mason * We must have no buffers or drop them. 848784b4e29SChris Mason */ 849784b4e29SChris Mason if (page_has_private(page) && 850784b4e29SChris Mason !try_to_release_page(page, GFP_KERNEL)) 851784b4e29SChris Mason return -EAGAIN; 852784b4e29SChris Mason return migrate_page(mapping, newpage, page); 853784b4e29SChris Mason } 8543dd1462eSJan Beulich #endif 855784b4e29SChris Mason 8565f39d397SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 8575f39d397SChris Mason { 858d1310b2eSChris Mason struct extent_io_tree *tree; 859b9473439SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 860b9473439SChris Mason struct extent_buffer *eb; 861b9473439SChris Mason int was_dirty; 8625443be45SChris Mason 863b9473439SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 864b9473439SChris Mason if (!(current->flags & PF_MEMALLOC)) { 865b9473439SChris Mason return extent_write_full_page(tree, page, 866b9473439SChris Mason btree_get_extent, wbc); 867b9473439SChris Mason } 868b9473439SChris Mason 8695443be45SChris Mason redirty_page_for_writepage(wbc, page); 870784b4e29SChris Mason eb = btrfs_find_tree_block(root, page_offset(page), PAGE_CACHE_SIZE); 871b9473439SChris Mason WARN_ON(!eb); 872b9473439SChris Mason 873b9473439SChris Mason was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); 874b9473439SChris Mason if (!was_dirty) { 875b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 876b9473439SChris Mason root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE; 877b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 878b9473439SChris Mason } 879b9473439SChris Mason free_extent_buffer(eb); 880b9473439SChris Mason 8815443be45SChris Mason unlock_page(page); 8825443be45SChris Mason return 0; 8835443be45SChris Mason } 8840da5468fSChris Mason 8850da5468fSChris Mason static int btree_writepages(struct address_space *mapping, 8860da5468fSChris Mason struct writeback_control *wbc) 8870da5468fSChris Mason { 888d1310b2eSChris Mason struct extent_io_tree *tree; 889d1310b2eSChris Mason tree = &BTRFS_I(mapping->host)->io_tree; 890d8d5f3e1SChris Mason if (wbc->sync_mode == WB_SYNC_NONE) { 891b9473439SChris Mason struct btrfs_root *root = BTRFS_I(mapping->host)->root; 892793955bcSChris Mason u64 num_dirty; 89324ab9cd8SChris Mason unsigned long thresh = 32 * 1024 * 1024; 894448d640bSChris Mason 895448d640bSChris Mason if (wbc->for_kupdate) 896448d640bSChris Mason return 0; 897448d640bSChris Mason 898b9473439SChris Mason /* this is a bit racy, but that's ok */ 899b9473439SChris Mason num_dirty = root->fs_info->dirty_metadata_bytes; 900d397712bSChris Mason if (num_dirty < thresh) 901793955bcSChris Mason return 0; 902793955bcSChris Mason } 9030da5468fSChris Mason return extent_writepages(tree, mapping, btree_get_extent, wbc); 9040da5468fSChris Mason } 9050da5468fSChris Mason 906b2950863SChristoph Hellwig static int btree_readpage(struct file *file, struct page *page) 9075f39d397SChris Mason { 908d1310b2eSChris Mason struct extent_io_tree *tree; 909d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 9105f39d397SChris Mason return extent_read_full_page(tree, page, btree_get_extent); 9115f39d397SChris Mason } 9125f39d397SChris Mason 91370dec807SChris Mason static int btree_releasepage(struct page *page, gfp_t gfp_flags) 9145f39d397SChris Mason { 915d1310b2eSChris Mason struct extent_io_tree *tree; 916d1310b2eSChris Mason struct extent_map_tree *map; 9175f39d397SChris Mason int ret; 9185f39d397SChris Mason 91998509cfcSChris Mason if (PageWriteback(page) || PageDirty(page)) 92098509cfcSChris Mason return 0; 92198509cfcSChris Mason 922d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 923d1310b2eSChris Mason map = &BTRFS_I(page->mapping->host)->extent_tree; 9246af118ceSChris Mason 9257b13b7b1SChris Mason ret = try_release_extent_state(map, tree, page, gfp_flags); 926d397712bSChris Mason if (!ret) 9276af118ceSChris Mason return 0; 9286af118ceSChris Mason 9296af118ceSChris Mason ret = try_release_extent_buffer(tree, page); 9305f39d397SChris Mason if (ret == 1) { 9315f39d397SChris Mason ClearPagePrivate(page); 9325f39d397SChris Mason set_page_private(page, 0); 933d98237b3SChris Mason page_cache_release(page); 9345f39d397SChris Mason } 9356af118ceSChris Mason 936d98237b3SChris Mason return ret; 937d98237b3SChris Mason } 938d98237b3SChris Mason 9395f39d397SChris Mason static void btree_invalidatepage(struct page *page, unsigned long offset) 940d98237b3SChris Mason { 941d1310b2eSChris Mason struct extent_io_tree *tree; 942d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 9435f39d397SChris Mason extent_invalidatepage(tree, page, offset); 9445f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 9459ad6b7bcSChris Mason if (PagePrivate(page)) { 946d397712bSChris Mason printk(KERN_WARNING "btrfs warning page private not zero " 947d397712bSChris Mason "on page %llu\n", (unsigned long long)page_offset(page)); 9489ad6b7bcSChris Mason ClearPagePrivate(page); 9499ad6b7bcSChris Mason set_page_private(page, 0); 9509ad6b7bcSChris Mason page_cache_release(page); 9519ad6b7bcSChris Mason } 952d98237b3SChris Mason } 953d98237b3SChris Mason 9547f09410bSAlexey Dobriyan static const struct address_space_operations btree_aops = { 955d98237b3SChris Mason .readpage = btree_readpage, 956d98237b3SChris Mason .writepage = btree_writepage, 9570da5468fSChris Mason .writepages = btree_writepages, 9585f39d397SChris Mason .releasepage = btree_releasepage, 9595f39d397SChris Mason .invalidatepage = btree_invalidatepage, 9605a92bc88SChris Mason #ifdef CONFIG_MIGRATION 961784b4e29SChris Mason .migratepage = btree_migratepage, 9625a92bc88SChris Mason #endif 963d98237b3SChris Mason }; 964123abc88SChris Mason 965ca7a79adSChris Mason int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, 966ca7a79adSChris Mason u64 parent_transid) 967090d1875SChris Mason { 9685f39d397SChris Mason struct extent_buffer *buf = NULL; 9695f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 970de428b63SChris Mason int ret = 0; 971090d1875SChris Mason 972db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 9735f39d397SChris Mason if (!buf) 974090d1875SChris Mason return 0; 975d1310b2eSChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, 976f188591eSChris Mason buf, 0, 0, btree_get_extent, 0); 9775f39d397SChris Mason free_extent_buffer(buf); 978de428b63SChris Mason return ret; 979090d1875SChris Mason } 980090d1875SChris Mason 9810999df54SChris Mason struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, 9820999df54SChris Mason u64 bytenr, u32 blocksize) 9830999df54SChris Mason { 9840999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 9850999df54SChris Mason struct extent_buffer *eb; 9860999df54SChris Mason eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 987f09d1f60SDavid Sterba bytenr, blocksize); 9880999df54SChris Mason return eb; 9890999df54SChris Mason } 9900999df54SChris Mason 9910999df54SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 9920999df54SChris Mason u64 bytenr, u32 blocksize) 9930999df54SChris Mason { 9940999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 9950999df54SChris Mason struct extent_buffer *eb; 9960999df54SChris Mason 9970999df54SChris Mason eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 998ba144192SDavid Sterba bytenr, blocksize, NULL); 9990999df54SChris Mason return eb; 10000999df54SChris Mason } 10010999df54SChris Mason 10020999df54SChris Mason 1003e02119d5SChris Mason int btrfs_write_tree_block(struct extent_buffer *buf) 1004e02119d5SChris Mason { 10058aa38c31SChristoph Hellwig return filemap_fdatawrite_range(buf->first_page->mapping, buf->start, 10068aa38c31SChristoph Hellwig buf->start + buf->len - 1); 1007e02119d5SChris Mason } 1008e02119d5SChris Mason 1009e02119d5SChris Mason int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) 1010e02119d5SChris Mason { 10118aa38c31SChristoph Hellwig return filemap_fdatawait_range(buf->first_page->mapping, 10128aa38c31SChristoph Hellwig buf->start, buf->start + buf->len - 1); 1013e02119d5SChris Mason } 1014e02119d5SChris Mason 1015db94535dSChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, 1016ca7a79adSChris Mason u32 blocksize, u64 parent_transid) 1017e20d96d6SChris Mason { 10185f39d397SChris Mason struct extent_buffer *buf = NULL; 101919c00ddcSChris Mason int ret; 102019c00ddcSChris Mason 1021db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 10225f39d397SChris Mason if (!buf) 1023d98237b3SChris Mason return NULL; 1024e4204dedSChris Mason 1025ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 1026ce9adaa5SChris Mason 1027d397712bSChris Mason if (ret == 0) 1028b4ce94deSChris Mason set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); 10295f39d397SChris Mason return buf; 1030ce9adaa5SChris Mason 1031eb60ceacSChris Mason } 1032eb60ceacSChris Mason 1033e089f05cSChris Mason int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, 10345f39d397SChris Mason struct extent_buffer *buf) 1035ed2ff2cbSChris Mason { 10365f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 103755c69072SChris Mason if (btrfs_header_generation(buf) == 1038925baeddSChris Mason root->fs_info->running_transaction->transid) { 1039b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 1040b4ce94deSChris Mason 1041b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { 1042b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 1043b9473439SChris Mason if (root->fs_info->dirty_metadata_bytes >= buf->len) 1044b9473439SChris Mason root->fs_info->dirty_metadata_bytes -= buf->len; 1045b9473439SChris Mason else 1046b9473439SChris Mason WARN_ON(1); 1047b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 1048b9473439SChris Mason } 1049b4ce94deSChris Mason 1050b9473439SChris Mason /* ugh, clear_extent_buffer_dirty needs to lock the page */ 1051b9473439SChris Mason btrfs_set_lock_blocking(buf); 1052d1310b2eSChris Mason clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 105355c69072SChris Mason buf); 1054925baeddSChris Mason } 10555f39d397SChris Mason return 0; 10565f39d397SChris Mason } 10575f39d397SChris Mason 1058db94535dSChris Mason static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 105987ee04ebSChris Mason u32 stripesize, struct btrfs_root *root, 10609f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 1061e20d96d6SChris Mason u64 objectid) 1062d97e63b6SChris Mason { 1063cfaa7295SChris Mason root->node = NULL; 1064a28ec197SChris Mason root->commit_root = NULL; 1065db94535dSChris Mason root->sectorsize = sectorsize; 1066db94535dSChris Mason root->nodesize = nodesize; 1067db94535dSChris Mason root->leafsize = leafsize; 106887ee04ebSChris Mason root->stripesize = stripesize; 1069123abc88SChris Mason root->ref_cows = 0; 10700b86a832SChris Mason root->track_dirty = 0; 1071c71bf099SYan, Zheng root->in_radix = 0; 1072d68fc57bSYan, Zheng root->orphan_item_inserted = 0; 1073d68fc57bSYan, Zheng root->orphan_cleanup_state = 0; 10740b86a832SChris Mason 10759f5fae2fSChris Mason root->fs_info = fs_info; 10760f7d52f4SChris Mason root->objectid = objectid; 10770f7d52f4SChris Mason root->last_trans = 0; 107813a8a7c8SYan, Zheng root->highest_objectid = 0; 107958176a96SJosef Bacik root->name = NULL; 10806bef4d31SEric Paris root->inode_tree = RB_ROOT; 108116cdcec7SMiao Xie INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC); 1082f0486c68SYan, Zheng root->block_rsv = NULL; 1083d68fc57bSYan, Zheng root->orphan_block_rsv = NULL; 10840b86a832SChris Mason 10850b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 10867b128766SJosef Bacik INIT_LIST_HEAD(&root->orphan_list); 10875d4f98a2SYan Zheng INIT_LIST_HEAD(&root->root_list); 1088d68fc57bSYan, Zheng spin_lock_init(&root->orphan_lock); 10895d4f98a2SYan Zheng spin_lock_init(&root->inode_lock); 1090f0486c68SYan, Zheng spin_lock_init(&root->accounting_lock); 1091a2135011SChris Mason mutex_init(&root->objectid_mutex); 1092e02119d5SChris Mason mutex_init(&root->log_mutex); 10937237f183SYan Zheng init_waitqueue_head(&root->log_writer_wait); 10947237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[0]); 10957237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[1]); 10967237f183SYan Zheng atomic_set(&root->log_commit[0], 0); 10977237f183SYan Zheng atomic_set(&root->log_commit[1], 0); 10987237f183SYan Zheng atomic_set(&root->log_writers, 0); 10997237f183SYan Zheng root->log_batch = 0; 11007237f183SYan Zheng root->log_transid = 0; 1101257c62e1SChris Mason root->last_log_commit = 0; 1102d0c803c4SChris Mason extent_io_tree_init(&root->dirty_log_pages, 1103f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 1104017e5369SChris Mason 11053768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 11063768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 11076702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 110858176a96SJosef Bacik memset(&root->root_kobj, 0, sizeof(root->root_kobj)); 11093f157a2fSChris Mason root->defrag_trans_start = fs_info->generation; 111058176a96SJosef Bacik init_completion(&root->kobj_unregister); 11116702ed49SChris Mason root->defrag_running = 0; 11124d775673SChris Mason root->root_key.objectid = objectid; 11130ee5dc67SAl Viro root->anon_dev = 0; 11143768f368SChris Mason return 0; 11153768f368SChris Mason } 11163768f368SChris Mason 1117db94535dSChris Mason static int find_and_setup_root(struct btrfs_root *tree_root, 11189f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 11199f5fae2fSChris Mason u64 objectid, 1120e20d96d6SChris Mason struct btrfs_root *root) 11213768f368SChris Mason { 11223768f368SChris Mason int ret; 1123db94535dSChris Mason u32 blocksize; 112484234f3aSYan Zheng u64 generation; 11253768f368SChris Mason 1126db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 112787ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 112887ee04ebSChris Mason root, fs_info, objectid); 11293768f368SChris Mason ret = btrfs_find_last_root(tree_root, objectid, 11303768f368SChris Mason &root->root_item, &root->root_key); 11314df27c4dSYan, Zheng if (ret > 0) 11324df27c4dSYan, Zheng return -ENOENT; 11333768f368SChris Mason BUG_ON(ret); 11343768f368SChris Mason 113584234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1136db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 1137af31f5e5SChris Mason root->commit_root = NULL; 1138db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 113984234f3aSYan Zheng blocksize, generation); 114068433b73SChris Mason if (!root->node || !btrfs_buffer_uptodate(root->node, generation)) { 114168433b73SChris Mason free_extent_buffer(root->node); 1142af31f5e5SChris Mason root->node = NULL; 114368433b73SChris Mason return -EIO; 114468433b73SChris Mason } 11454df27c4dSYan, Zheng root->commit_root = btrfs_root_node(root); 1146d97e63b6SChris Mason return 0; 1147d97e63b6SChris Mason } 1148d97e63b6SChris Mason 11497237f183SYan Zheng static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, 1150e02119d5SChris Mason struct btrfs_fs_info *fs_info) 11510f7d52f4SChris Mason { 11520f7d52f4SChris Mason struct btrfs_root *root; 11530f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 11547237f183SYan Zheng struct extent_buffer *leaf; 1155e02119d5SChris Mason 1156e02119d5SChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 1157e02119d5SChris Mason if (!root) 11587237f183SYan Zheng return ERR_PTR(-ENOMEM); 1159e02119d5SChris Mason 1160e02119d5SChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 1161e02119d5SChris Mason tree_root->sectorsize, tree_root->stripesize, 1162e02119d5SChris Mason root, fs_info, BTRFS_TREE_LOG_OBJECTID); 1163e02119d5SChris Mason 1164e02119d5SChris Mason root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; 1165e02119d5SChris Mason root->root_key.type = BTRFS_ROOT_ITEM_KEY; 1166e02119d5SChris Mason root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; 11677237f183SYan Zheng /* 11687237f183SYan Zheng * log trees do not get reference counted because they go away 11697237f183SYan Zheng * before a real commit is actually done. They do store pointers 11707237f183SYan Zheng * to file data extents, and those reference counts still get 11717237f183SYan Zheng * updated (along with back refs to the log tree). 11727237f183SYan Zheng */ 1173e02119d5SChris Mason root->ref_cows = 0; 1174e02119d5SChris Mason 11755d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 11765d4f98a2SYan Zheng BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0); 11777237f183SYan Zheng if (IS_ERR(leaf)) { 11787237f183SYan Zheng kfree(root); 11797237f183SYan Zheng return ERR_CAST(leaf); 11807237f183SYan Zheng } 1181e02119d5SChris Mason 11825d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 11835d4f98a2SYan Zheng btrfs_set_header_bytenr(leaf, leaf->start); 11845d4f98a2SYan Zheng btrfs_set_header_generation(leaf, trans->transid); 11855d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 11865d4f98a2SYan Zheng btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); 11877237f183SYan Zheng root->node = leaf; 1188e02119d5SChris Mason 1189e02119d5SChris Mason write_extent_buffer(root->node, root->fs_info->fsid, 1190e02119d5SChris Mason (unsigned long)btrfs_header_fsid(root->node), 1191e02119d5SChris Mason BTRFS_FSID_SIZE); 1192e02119d5SChris Mason btrfs_mark_buffer_dirty(root->node); 1193e02119d5SChris Mason btrfs_tree_unlock(root->node); 11947237f183SYan Zheng return root; 11957237f183SYan Zheng } 11967237f183SYan Zheng 11977237f183SYan Zheng int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 11987237f183SYan Zheng struct btrfs_fs_info *fs_info) 11997237f183SYan Zheng { 12007237f183SYan Zheng struct btrfs_root *log_root; 12017237f183SYan Zheng 12027237f183SYan Zheng log_root = alloc_log_tree(trans, fs_info); 12037237f183SYan Zheng if (IS_ERR(log_root)) 12047237f183SYan Zheng return PTR_ERR(log_root); 12057237f183SYan Zheng WARN_ON(fs_info->log_root_tree); 12067237f183SYan Zheng fs_info->log_root_tree = log_root; 12077237f183SYan Zheng return 0; 12087237f183SYan Zheng } 12097237f183SYan Zheng 12107237f183SYan Zheng int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 12117237f183SYan Zheng struct btrfs_root *root) 12127237f183SYan Zheng { 12137237f183SYan Zheng struct btrfs_root *log_root; 12147237f183SYan Zheng struct btrfs_inode_item *inode_item; 12157237f183SYan Zheng 12167237f183SYan Zheng log_root = alloc_log_tree(trans, root->fs_info); 12177237f183SYan Zheng if (IS_ERR(log_root)) 12187237f183SYan Zheng return PTR_ERR(log_root); 12197237f183SYan Zheng 12207237f183SYan Zheng log_root->last_trans = trans->transid; 12217237f183SYan Zheng log_root->root_key.offset = root->root_key.objectid; 12227237f183SYan Zheng 12237237f183SYan Zheng inode_item = &log_root->root_item.inode; 12247237f183SYan Zheng inode_item->generation = cpu_to_le64(1); 12257237f183SYan Zheng inode_item->size = cpu_to_le64(3); 12267237f183SYan Zheng inode_item->nlink = cpu_to_le32(1); 12277237f183SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 12287237f183SYan Zheng inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 12297237f183SYan Zheng 12305d4f98a2SYan Zheng btrfs_set_root_node(&log_root->root_item, log_root->node); 12317237f183SYan Zheng 12327237f183SYan Zheng WARN_ON(root->log_root); 12337237f183SYan Zheng root->log_root = log_root; 12347237f183SYan Zheng root->log_transid = 0; 1235257c62e1SChris Mason root->last_log_commit = 0; 1236e02119d5SChris Mason return 0; 1237e02119d5SChris Mason } 1238e02119d5SChris Mason 1239e02119d5SChris Mason struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, 1240e02119d5SChris Mason struct btrfs_key *location) 1241e02119d5SChris Mason { 1242e02119d5SChris Mason struct btrfs_root *root; 1243e02119d5SChris Mason struct btrfs_fs_info *fs_info = tree_root->fs_info; 12440f7d52f4SChris Mason struct btrfs_path *path; 12455f39d397SChris Mason struct extent_buffer *l; 124684234f3aSYan Zheng u64 generation; 1247db94535dSChris Mason u32 blocksize; 12480f7d52f4SChris Mason int ret = 0; 12490f7d52f4SChris Mason 12505eda7b5eSChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 12510cf6c620SChris Mason if (!root) 12520f7d52f4SChris Mason return ERR_PTR(-ENOMEM); 12530f7d52f4SChris Mason if (location->offset == (u64)-1) { 1254db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 12550f7d52f4SChris Mason location->objectid, root); 12560f7d52f4SChris Mason if (ret) { 12570f7d52f4SChris Mason kfree(root); 12580f7d52f4SChris Mason return ERR_PTR(ret); 12590f7d52f4SChris Mason } 126013a8a7c8SYan, Zheng goto out; 12610f7d52f4SChris Mason } 12620f7d52f4SChris Mason 1263db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 126487ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 126587ee04ebSChris Mason root, fs_info, location->objectid); 12660f7d52f4SChris Mason 12670f7d52f4SChris Mason path = btrfs_alloc_path(); 1268db5b493aSTsutomu Itoh if (!path) { 1269db5b493aSTsutomu Itoh kfree(root); 1270db5b493aSTsutomu Itoh return ERR_PTR(-ENOMEM); 1271db5b493aSTsutomu Itoh } 12720f7d52f4SChris Mason ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); 127313a8a7c8SYan, Zheng if (ret == 0) { 12745f39d397SChris Mason l = path->nodes[0]; 12755f39d397SChris Mason read_extent_buffer(l, &root->root_item, 12765f39d397SChris Mason btrfs_item_ptr_offset(l, path->slots[0]), 12770f7d52f4SChris Mason sizeof(root->root_item)); 127844b36eb2SYan Zheng memcpy(&root->root_key, location, sizeof(*location)); 127913a8a7c8SYan, Zheng } 12800f7d52f4SChris Mason btrfs_free_path(path); 12810f7d52f4SChris Mason if (ret) { 12825e540f77STsutomu Itoh kfree(root); 128313a8a7c8SYan, Zheng if (ret > 0) 128413a8a7c8SYan, Zheng ret = -ENOENT; 12850f7d52f4SChris Mason return ERR_PTR(ret); 12860f7d52f4SChris Mason } 128713a8a7c8SYan, Zheng 128884234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1289db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 1290db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 129184234f3aSYan Zheng blocksize, generation); 12925d4f98a2SYan Zheng root->commit_root = btrfs_root_node(root); 12930f7d52f4SChris Mason BUG_ON(!root->node); 129413a8a7c8SYan, Zheng out: 129508fe4db1SLi Zefan if (location->objectid != BTRFS_TREE_LOG_OBJECTID) { 12960f7d52f4SChris Mason root->ref_cows = 1; 129708fe4db1SLi Zefan btrfs_check_and_init_root_item(&root->root_item); 129808fe4db1SLi Zefan } 129913a8a7c8SYan, Zheng 13005eda7b5eSChris Mason return root; 13015eda7b5eSChris Mason } 13025eda7b5eSChris Mason 1303edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 1304edbd8d4eSChris Mason struct btrfs_key *location) 13055eda7b5eSChris Mason { 13065eda7b5eSChris Mason struct btrfs_root *root; 13075eda7b5eSChris Mason int ret; 13085eda7b5eSChris Mason 1309edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 1310edbd8d4eSChris Mason return fs_info->tree_root; 1311edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 1312edbd8d4eSChris Mason return fs_info->extent_root; 13138f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 13148f18cf13SChris Mason return fs_info->chunk_root; 13158f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 13168f18cf13SChris Mason return fs_info->dev_root; 13170403e47eSYan Zheng if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) 13180403e47eSYan Zheng return fs_info->csum_root; 13194df27c4dSYan, Zheng again: 13204df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 13215eda7b5eSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 13225eda7b5eSChris Mason (unsigned long)location->objectid); 13234df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 13245eda7b5eSChris Mason if (root) 13255eda7b5eSChris Mason return root; 13265eda7b5eSChris Mason 1327e02119d5SChris Mason root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); 13285eda7b5eSChris Mason if (IS_ERR(root)) 13295eda7b5eSChris Mason return root; 13303394e160SChris Mason 1331581bb050SLi Zefan root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS); 1332581bb050SLi Zefan root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned), 1333581bb050SLi Zefan GFP_NOFS); 133435a30d7cSDavid Sterba if (!root->free_ino_pinned || !root->free_ino_ctl) { 133535a30d7cSDavid Sterba ret = -ENOMEM; 1336581bb050SLi Zefan goto fail; 133735a30d7cSDavid Sterba } 1338581bb050SLi Zefan 1339581bb050SLi Zefan btrfs_init_free_ino_ctl(root); 1340581bb050SLi Zefan mutex_init(&root->fs_commit_mutex); 1341581bb050SLi Zefan spin_lock_init(&root->cache_lock); 1342581bb050SLi Zefan init_waitqueue_head(&root->cache_wait); 1343581bb050SLi Zefan 13440ee5dc67SAl Viro ret = get_anon_bdev(&root->anon_dev); 1345ac08aedfSChris Mason if (ret) 1346ac08aedfSChris Mason goto fail; 13473394e160SChris Mason 1348d68fc57bSYan, Zheng if (btrfs_root_refs(&root->root_item) == 0) { 1349d68fc57bSYan, Zheng ret = -ENOENT; 1350d68fc57bSYan, Zheng goto fail; 1351d68fc57bSYan, Zheng } 1352d68fc57bSYan, Zheng 1353d68fc57bSYan, Zheng ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid); 1354d68fc57bSYan, Zheng if (ret < 0) 1355d68fc57bSYan, Zheng goto fail; 1356d68fc57bSYan, Zheng if (ret == 0) 1357d68fc57bSYan, Zheng root->orphan_item_inserted = 1; 1358d68fc57bSYan, Zheng 13594df27c4dSYan, Zheng ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); 13604df27c4dSYan, Zheng if (ret) 13614df27c4dSYan, Zheng goto fail; 13624df27c4dSYan, Zheng 13634df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 13642619ba1fSChris Mason ret = radix_tree_insert(&fs_info->fs_roots_radix, 13652619ba1fSChris Mason (unsigned long)root->root_key.objectid, 13660f7d52f4SChris Mason root); 1367d68fc57bSYan, Zheng if (ret == 0) 13684df27c4dSYan, Zheng root->in_radix = 1; 1369d68fc57bSYan, Zheng 13704df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 13714df27c4dSYan, Zheng radix_tree_preload_end(); 13720f7d52f4SChris Mason if (ret) { 13734df27c4dSYan, Zheng if (ret == -EEXIST) { 13744df27c4dSYan, Zheng free_fs_root(root); 13754df27c4dSYan, Zheng goto again; 13760f7d52f4SChris Mason } 13774df27c4dSYan, Zheng goto fail; 13784df27c4dSYan, Zheng } 13794df27c4dSYan, Zheng 1380edbd8d4eSChris Mason ret = btrfs_find_dead_roots(fs_info->tree_root, 13815d4f98a2SYan Zheng root->root_key.objectid); 13824df27c4dSYan, Zheng WARN_ON(ret); 1383edbd8d4eSChris Mason return root; 13844df27c4dSYan, Zheng fail: 13854df27c4dSYan, Zheng free_fs_root(root); 13864df27c4dSYan, Zheng return ERR_PTR(ret); 1387edbd8d4eSChris Mason } 1388edbd8d4eSChris Mason 138904160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 139004160088SChris Mason { 139104160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 139204160088SChris Mason int ret = 0; 139304160088SChris Mason struct btrfs_device *device; 139404160088SChris Mason struct backing_dev_info *bdi; 1395b7967db7SChris Mason 13961f78160cSXiao Guangrong rcu_read_lock(); 13971f78160cSXiao Guangrong list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) { 1398dfe25020SChris Mason if (!device->bdev) 1399dfe25020SChris Mason continue; 140004160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 140104160088SChris Mason if (bdi && bdi_congested(bdi, bdi_bits)) { 140204160088SChris Mason ret = 1; 140304160088SChris Mason break; 140404160088SChris Mason } 140504160088SChris Mason } 14061f78160cSXiao Guangrong rcu_read_unlock(); 140704160088SChris Mason return ret; 140804160088SChris Mason } 140904160088SChris Mason 141038b66988SChris Mason /* 1411ad081f14SJens Axboe * If this fails, caller must call bdi_destroy() to get rid of the 1412ad081f14SJens Axboe * bdi again. 1413ad081f14SJens Axboe */ 141404160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 141504160088SChris Mason { 1416ad081f14SJens Axboe int err; 1417ad081f14SJens Axboe 1418ad081f14SJens Axboe bdi->capabilities = BDI_CAP_MAP_COPY; 1419e6d086d8SJens Axboe err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY); 1420ad081f14SJens Axboe if (err) 1421ad081f14SJens Axboe return err; 1422ad081f14SJens Axboe 14234575c9ccSChris Mason bdi->ra_pages = default_backing_dev_info.ra_pages; 142404160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 142504160088SChris Mason bdi->congested_data = info; 142604160088SChris Mason return 0; 142704160088SChris Mason } 142804160088SChris Mason 1429ce9adaa5SChris Mason static int bio_ready_for_csum(struct bio *bio) 1430ce9adaa5SChris Mason { 1431ce9adaa5SChris Mason u64 length = 0; 1432ce9adaa5SChris Mason u64 buf_len = 0; 1433ce9adaa5SChris Mason u64 start = 0; 1434ce9adaa5SChris Mason struct page *page; 1435ce9adaa5SChris Mason struct extent_io_tree *io_tree = NULL; 1436ce9adaa5SChris Mason struct bio_vec *bvec; 1437ce9adaa5SChris Mason int i; 1438ce9adaa5SChris Mason int ret; 1439ce9adaa5SChris Mason 1440ce9adaa5SChris Mason bio_for_each_segment(bvec, bio, i) { 1441ce9adaa5SChris Mason page = bvec->bv_page; 1442ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 1443ce9adaa5SChris Mason length += bvec->bv_len; 1444ce9adaa5SChris Mason continue; 1445ce9adaa5SChris Mason } 1446ce9adaa5SChris Mason if (!page->private) { 1447ce9adaa5SChris Mason length += bvec->bv_len; 1448ce9adaa5SChris Mason continue; 1449ce9adaa5SChris Mason } 1450ce9adaa5SChris Mason length = bvec->bv_len; 1451ce9adaa5SChris Mason buf_len = page->private >> 2; 1452ce9adaa5SChris Mason start = page_offset(page) + bvec->bv_offset; 1453ce9adaa5SChris Mason io_tree = &BTRFS_I(page->mapping->host)->io_tree; 1454ce9adaa5SChris Mason } 1455ce9adaa5SChris Mason /* are we fully contained in this bio? */ 1456ce9adaa5SChris Mason if (buf_len <= length) 1457ce9adaa5SChris Mason return 1; 1458ce9adaa5SChris Mason 1459ce9adaa5SChris Mason ret = extent_range_uptodate(io_tree, start + length, 1460ce9adaa5SChris Mason start + buf_len - 1); 1461ce9adaa5SChris Mason return ret; 1462ce9adaa5SChris Mason } 1463ce9adaa5SChris Mason 14648b712842SChris Mason /* 14658b712842SChris Mason * called by the kthread helper functions to finally call the bio end_io 14668b712842SChris Mason * functions. This is where read checksum verification actually happens 14678b712842SChris Mason */ 14688b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work) 1469ce9adaa5SChris Mason { 1470ce9adaa5SChris Mason struct bio *bio; 14718b712842SChris Mason struct end_io_wq *end_io_wq; 14728b712842SChris Mason struct btrfs_fs_info *fs_info; 1473ce9adaa5SChris Mason int error; 1474ce9adaa5SChris Mason 14758b712842SChris Mason end_io_wq = container_of(work, struct end_io_wq, work); 1476ce9adaa5SChris Mason bio = end_io_wq->bio; 14778b712842SChris Mason fs_info = end_io_wq->info; 14788b712842SChris Mason 1479cad321adSChris Mason /* metadata bio reads are special because the whole tree block must 14808b712842SChris Mason * be checksummed at once. This makes sure the entire block is in 14818b712842SChris Mason * ram and up to date before trying to verify things. For 14828b712842SChris Mason * blocksize <= pagesize, it is basically a noop 14838b712842SChris Mason */ 14847b6d91daSChristoph Hellwig if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata && 1485cad321adSChris Mason !bio_ready_for_csum(bio)) { 1486d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_meta_workers, 14878b712842SChris Mason &end_io_wq->work); 1488ce9adaa5SChris Mason return; 1489ce9adaa5SChris Mason } 1490ce9adaa5SChris Mason error = end_io_wq->error; 1491ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1492ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 1493ce9adaa5SChris Mason kfree(end_io_wq); 1494ce9adaa5SChris Mason bio_endio(bio, error); 1495ce9adaa5SChris Mason } 149644b8bd7eSChris Mason 1497a74a4b97SChris Mason static int cleaner_kthread(void *arg) 1498a74a4b97SChris Mason { 1499a74a4b97SChris Mason struct btrfs_root *root = arg; 1500a74a4b97SChris Mason 1501a74a4b97SChris Mason do { 1502a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 150376dda93cSYan, Zheng 150476dda93cSYan, Zheng if (!(root->fs_info->sb->s_flags & MS_RDONLY) && 150576dda93cSYan, Zheng mutex_trylock(&root->fs_info->cleaner_mutex)) { 150624bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 1507a74a4b97SChris Mason btrfs_clean_old_snapshots(root); 1508a74a4b97SChris Mason mutex_unlock(&root->fs_info->cleaner_mutex); 15094cb5300bSChris Mason btrfs_run_defrag_inodes(root->fs_info); 151076dda93cSYan, Zheng } 1511a74a4b97SChris Mason 1512a74a4b97SChris Mason if (freezing(current)) { 1513a74a4b97SChris Mason refrigerator(); 1514a74a4b97SChris Mason } else { 1515a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 15168929ecfaSYan, Zheng if (!kthread_should_stop()) 1517a74a4b97SChris Mason schedule(); 1518a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1519a74a4b97SChris Mason } 1520a74a4b97SChris Mason } while (!kthread_should_stop()); 1521a74a4b97SChris Mason return 0; 1522a74a4b97SChris Mason } 1523a74a4b97SChris Mason 1524a74a4b97SChris Mason static int transaction_kthread(void *arg) 1525a74a4b97SChris Mason { 1526a74a4b97SChris Mason struct btrfs_root *root = arg; 1527a74a4b97SChris Mason struct btrfs_trans_handle *trans; 1528a74a4b97SChris Mason struct btrfs_transaction *cur; 15298929ecfaSYan, Zheng u64 transid; 1530a74a4b97SChris Mason unsigned long now; 1531a74a4b97SChris Mason unsigned long delay; 1532a74a4b97SChris Mason int ret; 1533a74a4b97SChris Mason 1534a74a4b97SChris Mason do { 1535a74a4b97SChris Mason delay = HZ * 30; 1536a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 1537a74a4b97SChris Mason mutex_lock(&root->fs_info->transaction_kthread_mutex); 1538a74a4b97SChris Mason 1539a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1540a74a4b97SChris Mason cur = root->fs_info->running_transaction; 1541a74a4b97SChris Mason if (!cur) { 1542a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1543a74a4b97SChris Mason goto sleep; 1544a74a4b97SChris Mason } 154531153d81SYan Zheng 1546a74a4b97SChris Mason now = get_seconds(); 15478929ecfaSYan, Zheng if (!cur->blocked && 15488929ecfaSYan, Zheng (now < cur->start_time || now - cur->start_time < 30)) { 1549a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1550a74a4b97SChris Mason delay = HZ * 5; 1551a74a4b97SChris Mason goto sleep; 1552a74a4b97SChris Mason } 15538929ecfaSYan, Zheng transid = cur->transid; 1554a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 155556bec294SChris Mason 15567a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 15573612b495STsutomu Itoh BUG_ON(IS_ERR(trans)); 15588929ecfaSYan, Zheng if (transid == trans->transid) { 15598929ecfaSYan, Zheng ret = btrfs_commit_transaction(trans, root); 15608929ecfaSYan, Zheng BUG_ON(ret); 15618929ecfaSYan, Zheng } else { 15628929ecfaSYan, Zheng btrfs_end_transaction(trans, root); 15638929ecfaSYan, Zheng } 1564a74a4b97SChris Mason sleep: 1565a74a4b97SChris Mason wake_up_process(root->fs_info->cleaner_kthread); 1566a74a4b97SChris Mason mutex_unlock(&root->fs_info->transaction_kthread_mutex); 1567a74a4b97SChris Mason 1568a74a4b97SChris Mason if (freezing(current)) { 1569a74a4b97SChris Mason refrigerator(); 1570a74a4b97SChris Mason } else { 1571a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 15728929ecfaSYan, Zheng if (!kthread_should_stop() && 15738929ecfaSYan, Zheng !btrfs_transaction_blocked(root->fs_info)) 1574a74a4b97SChris Mason schedule_timeout(delay); 1575a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1576a74a4b97SChris Mason } 1577a74a4b97SChris Mason } while (!kthread_should_stop()); 1578a74a4b97SChris Mason return 0; 1579a74a4b97SChris Mason } 1580a74a4b97SChris Mason 1581af31f5e5SChris Mason /* 1582af31f5e5SChris Mason * this will find the highest generation in the array of 1583af31f5e5SChris Mason * root backups. The index of the highest array is returned, 1584af31f5e5SChris Mason * or -1 if we can't find anything. 1585af31f5e5SChris Mason * 1586af31f5e5SChris Mason * We check to make sure the array is valid by comparing the 1587af31f5e5SChris Mason * generation of the latest root in the array with the generation 1588af31f5e5SChris Mason * in the super block. If they don't match we pitch it. 1589af31f5e5SChris Mason */ 1590af31f5e5SChris Mason static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen) 1591af31f5e5SChris Mason { 1592af31f5e5SChris Mason u64 cur; 1593af31f5e5SChris Mason int newest_index = -1; 1594af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1595af31f5e5SChris Mason int i; 1596af31f5e5SChris Mason 1597af31f5e5SChris Mason for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { 1598af31f5e5SChris Mason root_backup = info->super_copy->super_roots + i; 1599af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1600af31f5e5SChris Mason if (cur == newest_gen) 1601af31f5e5SChris Mason newest_index = i; 1602af31f5e5SChris Mason } 1603af31f5e5SChris Mason 1604af31f5e5SChris Mason /* check to see if we actually wrapped around */ 1605af31f5e5SChris Mason if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) { 1606af31f5e5SChris Mason root_backup = info->super_copy->super_roots; 1607af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1608af31f5e5SChris Mason if (cur == newest_gen) 1609af31f5e5SChris Mason newest_index = 0; 1610af31f5e5SChris Mason } 1611af31f5e5SChris Mason return newest_index; 1612af31f5e5SChris Mason } 1613af31f5e5SChris Mason 1614af31f5e5SChris Mason 1615af31f5e5SChris Mason /* 1616af31f5e5SChris Mason * find the oldest backup so we know where to store new entries 1617af31f5e5SChris Mason * in the backup array. This will set the backup_root_index 1618af31f5e5SChris Mason * field in the fs_info struct 1619af31f5e5SChris Mason */ 1620af31f5e5SChris Mason static void find_oldest_super_backup(struct btrfs_fs_info *info, 1621af31f5e5SChris Mason u64 newest_gen) 1622af31f5e5SChris Mason { 1623af31f5e5SChris Mason int newest_index = -1; 1624af31f5e5SChris Mason 1625af31f5e5SChris Mason newest_index = find_newest_super_backup(info, newest_gen); 1626af31f5e5SChris Mason /* if there was garbage in there, just move along */ 1627af31f5e5SChris Mason if (newest_index == -1) { 1628af31f5e5SChris Mason info->backup_root_index = 0; 1629af31f5e5SChris Mason } else { 1630af31f5e5SChris Mason info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS; 1631af31f5e5SChris Mason } 1632af31f5e5SChris Mason } 1633af31f5e5SChris Mason 1634af31f5e5SChris Mason /* 1635af31f5e5SChris Mason * copy all the root pointers into the super backup array. 1636af31f5e5SChris Mason * this will bump the backup pointer by one when it is 1637af31f5e5SChris Mason * done 1638af31f5e5SChris Mason */ 1639af31f5e5SChris Mason static void backup_super_roots(struct btrfs_fs_info *info) 1640af31f5e5SChris Mason { 1641af31f5e5SChris Mason int next_backup; 1642af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1643af31f5e5SChris Mason int last_backup; 1644af31f5e5SChris Mason 1645af31f5e5SChris Mason next_backup = info->backup_root_index; 1646af31f5e5SChris Mason last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) % 1647af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 1648af31f5e5SChris Mason 1649af31f5e5SChris Mason /* 1650af31f5e5SChris Mason * just overwrite the last backup if we're at the same generation 1651af31f5e5SChris Mason * this happens only at umount 1652af31f5e5SChris Mason */ 1653af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + last_backup; 1654af31f5e5SChris Mason if (btrfs_backup_tree_root_gen(root_backup) == 1655af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)) 1656af31f5e5SChris Mason next_backup = last_backup; 1657af31f5e5SChris Mason 1658af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + next_backup; 1659af31f5e5SChris Mason 1660af31f5e5SChris Mason /* 1661af31f5e5SChris Mason * make sure all of our padding and empty slots get zero filled 1662af31f5e5SChris Mason * regardless of which ones we use today 1663af31f5e5SChris Mason */ 1664af31f5e5SChris Mason memset(root_backup, 0, sizeof(*root_backup)); 1665af31f5e5SChris Mason 1666af31f5e5SChris Mason info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS; 1667af31f5e5SChris Mason 1668af31f5e5SChris Mason btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start); 1669af31f5e5SChris Mason btrfs_set_backup_tree_root_gen(root_backup, 1670af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)); 1671af31f5e5SChris Mason 1672af31f5e5SChris Mason btrfs_set_backup_tree_root_level(root_backup, 1673af31f5e5SChris Mason btrfs_header_level(info->tree_root->node)); 1674af31f5e5SChris Mason 1675af31f5e5SChris Mason btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start); 1676af31f5e5SChris Mason btrfs_set_backup_chunk_root_gen(root_backup, 1677af31f5e5SChris Mason btrfs_header_generation(info->chunk_root->node)); 1678af31f5e5SChris Mason btrfs_set_backup_chunk_root_level(root_backup, 1679af31f5e5SChris Mason btrfs_header_level(info->chunk_root->node)); 1680af31f5e5SChris Mason 1681af31f5e5SChris Mason btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start); 1682af31f5e5SChris Mason btrfs_set_backup_extent_root_gen(root_backup, 1683af31f5e5SChris Mason btrfs_header_generation(info->extent_root->node)); 1684af31f5e5SChris Mason btrfs_set_backup_extent_root_level(root_backup, 1685af31f5e5SChris Mason btrfs_header_level(info->extent_root->node)); 1686af31f5e5SChris Mason 1687af31f5e5SChris Mason btrfs_set_backup_fs_root(root_backup, info->fs_root->node->start); 1688af31f5e5SChris Mason btrfs_set_backup_fs_root_gen(root_backup, 1689af31f5e5SChris Mason btrfs_header_generation(info->fs_root->node)); 1690af31f5e5SChris Mason btrfs_set_backup_fs_root_level(root_backup, 1691af31f5e5SChris Mason btrfs_header_level(info->fs_root->node)); 1692af31f5e5SChris Mason 1693af31f5e5SChris Mason btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start); 1694af31f5e5SChris Mason btrfs_set_backup_dev_root_gen(root_backup, 1695af31f5e5SChris Mason btrfs_header_generation(info->dev_root->node)); 1696af31f5e5SChris Mason btrfs_set_backup_dev_root_level(root_backup, 1697af31f5e5SChris Mason btrfs_header_level(info->dev_root->node)); 1698af31f5e5SChris Mason 1699af31f5e5SChris Mason btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start); 1700af31f5e5SChris Mason btrfs_set_backup_csum_root_gen(root_backup, 1701af31f5e5SChris Mason btrfs_header_generation(info->csum_root->node)); 1702af31f5e5SChris Mason btrfs_set_backup_csum_root_level(root_backup, 1703af31f5e5SChris Mason btrfs_header_level(info->csum_root->node)); 1704af31f5e5SChris Mason 1705af31f5e5SChris Mason btrfs_set_backup_total_bytes(root_backup, 1706af31f5e5SChris Mason btrfs_super_total_bytes(info->super_copy)); 1707af31f5e5SChris Mason btrfs_set_backup_bytes_used(root_backup, 1708af31f5e5SChris Mason btrfs_super_bytes_used(info->super_copy)); 1709af31f5e5SChris Mason btrfs_set_backup_num_devices(root_backup, 1710af31f5e5SChris Mason btrfs_super_num_devices(info->super_copy)); 1711af31f5e5SChris Mason 1712af31f5e5SChris Mason /* 1713af31f5e5SChris Mason * if we don't copy this out to the super_copy, it won't get remembered 1714af31f5e5SChris Mason * for the next commit 1715af31f5e5SChris Mason */ 1716af31f5e5SChris Mason memcpy(&info->super_copy->super_roots, 1717af31f5e5SChris Mason &info->super_for_commit->super_roots, 1718af31f5e5SChris Mason sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS); 1719af31f5e5SChris Mason } 1720af31f5e5SChris Mason 1721af31f5e5SChris Mason /* 1722af31f5e5SChris Mason * this copies info out of the root backup array and back into 1723af31f5e5SChris Mason * the in-memory super block. It is meant to help iterate through 1724af31f5e5SChris Mason * the array, so you send it the number of backups you've already 1725af31f5e5SChris Mason * tried and the last backup index you used. 1726af31f5e5SChris Mason * 1727af31f5e5SChris Mason * this returns -1 when it has tried all the backups 1728af31f5e5SChris Mason */ 1729af31f5e5SChris Mason static noinline int next_root_backup(struct btrfs_fs_info *info, 1730af31f5e5SChris Mason struct btrfs_super_block *super, 1731af31f5e5SChris Mason int *num_backups_tried, int *backup_index) 1732af31f5e5SChris Mason { 1733af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1734af31f5e5SChris Mason int newest = *backup_index; 1735af31f5e5SChris Mason 1736af31f5e5SChris Mason if (*num_backups_tried == 0) { 1737af31f5e5SChris Mason u64 gen = btrfs_super_generation(super); 1738af31f5e5SChris Mason 1739af31f5e5SChris Mason newest = find_newest_super_backup(info, gen); 1740af31f5e5SChris Mason if (newest == -1) 1741af31f5e5SChris Mason return -1; 1742af31f5e5SChris Mason 1743af31f5e5SChris Mason *backup_index = newest; 1744af31f5e5SChris Mason *num_backups_tried = 1; 1745af31f5e5SChris Mason } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) { 1746af31f5e5SChris Mason /* we've tried all the backups, all done */ 1747af31f5e5SChris Mason return -1; 1748af31f5e5SChris Mason } else { 1749af31f5e5SChris Mason /* jump to the next oldest backup */ 1750af31f5e5SChris Mason newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) % 1751af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 1752af31f5e5SChris Mason *backup_index = newest; 1753af31f5e5SChris Mason *num_backups_tried += 1; 1754af31f5e5SChris Mason } 1755af31f5e5SChris Mason root_backup = super->super_roots + newest; 1756af31f5e5SChris Mason 1757af31f5e5SChris Mason btrfs_set_super_generation(super, 1758af31f5e5SChris Mason btrfs_backup_tree_root_gen(root_backup)); 1759af31f5e5SChris Mason btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup)); 1760af31f5e5SChris Mason btrfs_set_super_root_level(super, 1761af31f5e5SChris Mason btrfs_backup_tree_root_level(root_backup)); 1762af31f5e5SChris Mason btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup)); 1763af31f5e5SChris Mason 1764af31f5e5SChris Mason /* 1765af31f5e5SChris Mason * fixme: the total bytes and num_devices need to match or we should 1766af31f5e5SChris Mason * need a fsck 1767af31f5e5SChris Mason */ 1768af31f5e5SChris Mason btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup)); 1769af31f5e5SChris Mason btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup)); 1770af31f5e5SChris Mason return 0; 1771af31f5e5SChris Mason } 1772af31f5e5SChris Mason 1773af31f5e5SChris Mason /* helper to cleanup tree roots */ 1774af31f5e5SChris Mason static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root) 1775af31f5e5SChris Mason { 1776af31f5e5SChris Mason free_extent_buffer(info->tree_root->node); 1777af31f5e5SChris Mason free_extent_buffer(info->tree_root->commit_root); 1778af31f5e5SChris Mason free_extent_buffer(info->dev_root->node); 1779af31f5e5SChris Mason free_extent_buffer(info->dev_root->commit_root); 1780af31f5e5SChris Mason free_extent_buffer(info->extent_root->node); 1781af31f5e5SChris Mason free_extent_buffer(info->extent_root->commit_root); 1782af31f5e5SChris Mason free_extent_buffer(info->csum_root->node); 1783af31f5e5SChris Mason free_extent_buffer(info->csum_root->commit_root); 1784af31f5e5SChris Mason 1785af31f5e5SChris Mason info->tree_root->node = NULL; 1786af31f5e5SChris Mason info->tree_root->commit_root = NULL; 1787af31f5e5SChris Mason info->dev_root->node = NULL; 1788af31f5e5SChris Mason info->dev_root->commit_root = NULL; 1789af31f5e5SChris Mason info->extent_root->node = NULL; 1790af31f5e5SChris Mason info->extent_root->commit_root = NULL; 1791af31f5e5SChris Mason info->csum_root->node = NULL; 1792af31f5e5SChris Mason info->csum_root->commit_root = NULL; 1793af31f5e5SChris Mason 1794af31f5e5SChris Mason if (chunk_root) { 1795af31f5e5SChris Mason free_extent_buffer(info->chunk_root->node); 1796af31f5e5SChris Mason free_extent_buffer(info->chunk_root->commit_root); 1797af31f5e5SChris Mason info->chunk_root->node = NULL; 1798af31f5e5SChris Mason info->chunk_root->commit_root = NULL; 1799af31f5e5SChris Mason } 1800af31f5e5SChris Mason } 1801af31f5e5SChris Mason 1802af31f5e5SChris Mason 18038a4b83ccSChris Mason struct btrfs_root *open_ctree(struct super_block *sb, 1804dfe25020SChris Mason struct btrfs_fs_devices *fs_devices, 1805dfe25020SChris Mason char *options) 1806eb60ceacSChris Mason { 1807db94535dSChris Mason u32 sectorsize; 1808db94535dSChris Mason u32 nodesize; 1809db94535dSChris Mason u32 leafsize; 1810db94535dSChris Mason u32 blocksize; 181187ee04ebSChris Mason u32 stripesize; 181284234f3aSYan Zheng u64 generation; 1813f2b636e8SJosef Bacik u64 features; 18143de4586cSChris Mason struct btrfs_key location; 1815a061fc8dSChris Mason struct buffer_head *bh; 1816e02119d5SChris Mason struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), 1817e20d96d6SChris Mason GFP_NOFS); 1818d20f7043SChris Mason struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root), 1819d20f7043SChris Mason GFP_NOFS); 1820450ba0eaSJosef Bacik struct btrfs_root *tree_root = btrfs_sb(sb); 18214891aca2SDavid Sterba struct btrfs_fs_info *fs_info = NULL; 1822e02119d5SChris Mason struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), 18230b86a832SChris Mason GFP_NOFS); 1824e02119d5SChris Mason struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), 18250b86a832SChris Mason GFP_NOFS); 1826e02119d5SChris Mason struct btrfs_root *log_tree_root; 1827e02119d5SChris Mason 1828eb60ceacSChris Mason int ret; 1829e58ca020SYan int err = -EINVAL; 1830af31f5e5SChris Mason int num_backups_tried = 0; 1831af31f5e5SChris Mason int backup_index = 0; 18324543df7eSChris Mason 18332c90e5d6SChris Mason struct btrfs_super_block *disk_super; 18348790d502SChris Mason 18354891aca2SDavid Sterba if (!extent_root || !tree_root || !tree_root->fs_info || 1836d20f7043SChris Mason !chunk_root || !dev_root || !csum_root) { 183739279cc3SChris Mason err = -ENOMEM; 183839279cc3SChris Mason goto fail; 183939279cc3SChris Mason } 18404891aca2SDavid Sterba fs_info = tree_root->fs_info; 184176dda93cSYan, Zheng 184276dda93cSYan, Zheng ret = init_srcu_struct(&fs_info->subvol_srcu); 184376dda93cSYan, Zheng if (ret) { 184476dda93cSYan, Zheng err = ret; 184576dda93cSYan, Zheng goto fail; 184676dda93cSYan, Zheng } 184776dda93cSYan, Zheng 184876dda93cSYan, Zheng ret = setup_bdi(fs_info, &fs_info->bdi); 184976dda93cSYan, Zheng if (ret) { 185076dda93cSYan, Zheng err = ret; 185176dda93cSYan, Zheng goto fail_srcu; 185276dda93cSYan, Zheng } 185376dda93cSYan, Zheng 185476dda93cSYan, Zheng fs_info->btree_inode = new_inode(sb); 185576dda93cSYan, Zheng if (!fs_info->btree_inode) { 185676dda93cSYan, Zheng err = -ENOMEM; 185776dda93cSYan, Zheng goto fail_bdi; 185876dda93cSYan, Zheng } 185976dda93cSYan, Zheng 1860a6591715SChris Mason mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); 18611561dedaSMiao Xie 186276dda93cSYan, Zheng INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); 18638fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 1864facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 186524bbcf04SYan, Zheng INIT_LIST_HEAD(&fs_info->delayed_iputs); 186619c00ddcSChris Mason INIT_LIST_HEAD(&fs_info->hashers); 1867ea8c2819SChris Mason INIT_LIST_HEAD(&fs_info->delalloc_inodes); 18685a3f23d5SChris Mason INIT_LIST_HEAD(&fs_info->ordered_operations); 186911833d66SYan Zheng INIT_LIST_HEAD(&fs_info->caching_block_groups); 18701832a6d5SChris Mason spin_lock_init(&fs_info->delalloc_lock); 1871a4abeea4SJosef Bacik spin_lock_init(&fs_info->trans_lock); 187231153d81SYan Zheng spin_lock_init(&fs_info->ref_cache_lock); 187376dda93cSYan, Zheng spin_lock_init(&fs_info->fs_roots_radix_lock); 187424bbcf04SYan, Zheng spin_lock_init(&fs_info->delayed_iput_lock); 18754cb5300bSChris Mason spin_lock_init(&fs_info->defrag_inodes_lock); 18762bf64758SJosef Bacik spin_lock_init(&fs_info->free_chunk_lock); 18777585717fSChris Mason mutex_init(&fs_info->reloc_mutex); 187819c00ddcSChris Mason 187958176a96SJosef Bacik init_completion(&fs_info->kobj_unregister); 18809f5fae2fSChris Mason fs_info->tree_root = tree_root; 18819f5fae2fSChris Mason fs_info->extent_root = extent_root; 1882d20f7043SChris Mason fs_info->csum_root = csum_root; 18830b86a832SChris Mason fs_info->chunk_root = chunk_root; 18840b86a832SChris Mason fs_info->dev_root = dev_root; 18858a4b83ccSChris Mason fs_info->fs_devices = fs_devices; 18860b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 18876324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 18880b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 1889f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->global_block_rsv); 1890f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->delalloc_block_rsv); 1891f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->trans_block_rsv); 1892f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->chunk_block_rsv); 1893f0486c68SYan, Zheng btrfs_init_block_rsv(&fs_info->empty_block_rsv); 1894cb03c743SChris Mason atomic_set(&fs_info->nr_async_submits, 0); 1895771ed689SChris Mason atomic_set(&fs_info->async_delalloc_pages, 0); 18968c8bee1dSChris Mason atomic_set(&fs_info->async_submit_draining, 0); 18970986fe9eSChris Mason atomic_set(&fs_info->nr_async_bios, 0); 18984cb5300bSChris Mason atomic_set(&fs_info->defrag_running, 0); 1899e20d96d6SChris Mason fs_info->sb = sb; 19006f568d35SChris Mason fs_info->max_inline = 8192 * 1024; 19019ed74f2dSJosef Bacik fs_info->metadata_ratio = 0; 19024cb5300bSChris Mason fs_info->defrag_inodes = RB_ROOT; 1903a4abeea4SJosef Bacik fs_info->trans_no_join = 0; 19042bf64758SJosef Bacik fs_info->free_chunk_space = 0; 1905c8b97818SChris Mason 1906b34b086cSChris Mason fs_info->thread_pool_size = min_t(unsigned long, 1907b34b086cSChris Mason num_online_cpus() + 2, 8); 19080afbaf8cSChris Mason 19093eaa2885SChris Mason INIT_LIST_HEAD(&fs_info->ordered_extents); 19103eaa2885SChris Mason spin_lock_init(&fs_info->ordered_extent_lock); 191116cdcec7SMiao Xie fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), 191216cdcec7SMiao Xie GFP_NOFS); 191316cdcec7SMiao Xie if (!fs_info->delayed_root) { 191416cdcec7SMiao Xie err = -ENOMEM; 191516cdcec7SMiao Xie goto fail_iput; 191616cdcec7SMiao Xie } 191716cdcec7SMiao Xie btrfs_init_delayed_root(fs_info->delayed_root); 19183eaa2885SChris Mason 1919a2de733cSArne Jansen mutex_init(&fs_info->scrub_lock); 1920a2de733cSArne Jansen atomic_set(&fs_info->scrubs_running, 0); 1921a2de733cSArne Jansen atomic_set(&fs_info->scrub_pause_req, 0); 1922a2de733cSArne Jansen atomic_set(&fs_info->scrubs_paused, 0); 1923a2de733cSArne Jansen atomic_set(&fs_info->scrub_cancel_req, 0); 1924a2de733cSArne Jansen init_waitqueue_head(&fs_info->scrub_pause_wait); 1925a2de733cSArne Jansen init_rwsem(&fs_info->scrub_super_lock); 1926a2de733cSArne Jansen fs_info->scrub_workers_refcnt = 0; 1927a2de733cSArne Jansen 1928a061fc8dSChris Mason sb->s_blocksize = 4096; 1929a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 193032a88aa1SJens Axboe sb->s_bdi = &fs_info->bdi; 1931a061fc8dSChris Mason 193276dda93cSYan, Zheng fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; 193376dda93cSYan, Zheng fs_info->btree_inode->i_nlink = 1; 19340afbaf8cSChris Mason /* 19350afbaf8cSChris Mason * we set the i_size on the btree inode to the max possible int. 19360afbaf8cSChris Mason * the real end of the address space is determined by all of 19370afbaf8cSChris Mason * the devices in the system 19380afbaf8cSChris Mason */ 19390afbaf8cSChris Mason fs_info->btree_inode->i_size = OFFSET_MAX; 1940d98237b3SChris Mason fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 194104160088SChris Mason fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; 194204160088SChris Mason 19435d4f98a2SYan Zheng RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); 1944d1310b2eSChris Mason extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 1945f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 1946a8067e02SDavid Sterba extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree); 19470da5468fSChris Mason 1948d1310b2eSChris Mason BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 1949d1310b2eSChris Mason 19500f7d52f4SChris Mason BTRFS_I(fs_info->btree_inode)->root = tree_root; 19510f7d52f4SChris Mason memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 19520f7d52f4SChris Mason sizeof(struct btrfs_key)); 195376dda93cSYan, Zheng BTRFS_I(fs_info->btree_inode)->dummy_inode = 1; 195422b0ebdaSChris Mason insert_inode_hash(fs_info->btree_inode); 195539279cc3SChris Mason 1956e02119d5SChris Mason spin_lock_init(&fs_info->block_group_cache_lock); 19576bef4d31SEric Paris fs_info->block_group_cache_tree = RB_ROOT; 1958925baeddSChris Mason 195911833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[0], 1960f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 196111833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[1], 1962f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 196311833d66SYan Zheng fs_info->pinned_extents = &fs_info->freed_extents[0]; 1964e6dcd2dcSChris Mason fs_info->do_barriers = 1; 1965f9295749SChris Mason 1966d98237b3SChris Mason 19675a3f23d5SChris Mason mutex_init(&fs_info->ordered_operations_mutex); 196830ae8467SChris Mason mutex_init(&fs_info->tree_log_mutex); 1969925baeddSChris Mason mutex_init(&fs_info->chunk_mutex); 1970925baeddSChris Mason mutex_init(&fs_info->transaction_kthread_mutex); 1971a74a4b97SChris Mason mutex_init(&fs_info->cleaner_mutex); 1972a74a4b97SChris Mason mutex_init(&fs_info->volume_mutex); 1973276e680dSYan Zheng init_rwsem(&fs_info->extent_commit_sem); 1974c71bf099SYan, Zheng init_rwsem(&fs_info->cleanup_work_sem); 197576dda93cSYan, Zheng init_rwsem(&fs_info->subvol_sem); 1976fa9c0d79SChris Mason 1977fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); 1978fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->data_alloc_cluster); 1979fa9c0d79SChris Mason 19807d9eb12cSChris Mason init_waitqueue_head(&fs_info->transaction_throttle); 19813768f368SChris Mason init_waitqueue_head(&fs_info->transaction_wait); 1982bb9c12c9SSage Weil init_waitqueue_head(&fs_info->transaction_blocked_wait); 19834854ddd0SChris Mason init_waitqueue_head(&fs_info->async_submit_wait); 19849a8dd150SChris Mason 19850b86a832SChris Mason __setup_root(4096, 4096, 4096, 4096, tree_root, 19862c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 19877eccb903SChris Mason 1988a512bbf8SYan Zheng bh = btrfs_read_dev_super(fs_devices->latest_bdev); 198920b45077SDave Young if (!bh) { 199020b45077SDave Young err = -EINVAL; 199116cdcec7SMiao Xie goto fail_alloc; 199220b45077SDave Young } 199339279cc3SChris Mason 19946c41761fSDavid Sterba memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy)); 19956c41761fSDavid Sterba memcpy(fs_info->super_for_commit, fs_info->super_copy, 19966c41761fSDavid Sterba sizeof(*fs_info->super_for_commit)); 1997a061fc8dSChris Mason brelse(bh); 19985f39d397SChris Mason 19996c41761fSDavid Sterba memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); 20000b86a832SChris Mason 20016c41761fSDavid Sterba disk_super = fs_info->super_copy; 20020f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 200316cdcec7SMiao Xie goto fail_alloc; 20040f7d52f4SChris Mason 2005acce952bSliubo /* check FS state, whether FS is broken. */ 2006acce952bSliubo fs_info->fs_state |= btrfs_super_flags(disk_super); 2007acce952bSliubo 2008acce952bSliubo btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); 2009acce952bSliubo 201075e7cb7fSLiu Bo /* 2011af31f5e5SChris Mason * run through our array of backup supers and setup 2012af31f5e5SChris Mason * our ring pointer to the oldest one 2013af31f5e5SChris Mason */ 2014af31f5e5SChris Mason generation = btrfs_super_generation(disk_super); 2015af31f5e5SChris Mason find_oldest_super_backup(fs_info, generation); 2016af31f5e5SChris Mason 2017af31f5e5SChris Mason /* 201875e7cb7fSLiu Bo * In the long term, we'll store the compression type in the super 201975e7cb7fSLiu Bo * block, and it'll be used for per file compression control. 202075e7cb7fSLiu Bo */ 202175e7cb7fSLiu Bo fs_info->compress_type = BTRFS_COMPRESS_ZLIB; 202275e7cb7fSLiu Bo 20232b82032cSYan Zheng ret = btrfs_parse_options(tree_root, options); 20242b82032cSYan Zheng if (ret) { 20252b82032cSYan Zheng err = ret; 202616cdcec7SMiao Xie goto fail_alloc; 20272b82032cSYan Zheng } 2028dfe25020SChris Mason 2029f2b636e8SJosef Bacik features = btrfs_super_incompat_flags(disk_super) & 2030f2b636e8SJosef Bacik ~BTRFS_FEATURE_INCOMPAT_SUPP; 2031f2b636e8SJosef Bacik if (features) { 2032f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount because of " 2033f2b636e8SJosef Bacik "unsupported optional features (%Lx).\n", 203421380931SJoel Becker (unsigned long long)features); 2035f2b636e8SJosef Bacik err = -EINVAL; 203616cdcec7SMiao Xie goto fail_alloc; 2037f2b636e8SJosef Bacik } 2038f2b636e8SJosef Bacik 20395d4f98a2SYan Zheng features = btrfs_super_incompat_flags(disk_super); 20405d4f98a2SYan Zheng features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; 2041a6fa6faeSLi Zefan if (tree_root->fs_info->compress_type & BTRFS_COMPRESS_LZO) 2042a6fa6faeSLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 20435d4f98a2SYan Zheng btrfs_set_super_incompat_flags(disk_super, features); 20445d4f98a2SYan Zheng 2045f2b636e8SJosef Bacik features = btrfs_super_compat_ro_flags(disk_super) & 2046f2b636e8SJosef Bacik ~BTRFS_FEATURE_COMPAT_RO_SUPP; 2047f2b636e8SJosef Bacik if (!(sb->s_flags & MS_RDONLY) && features) { 2048f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " 2049f2b636e8SJosef Bacik "unsupported option features (%Lx).\n", 205021380931SJoel Becker (unsigned long long)features); 2051f2b636e8SJosef Bacik err = -EINVAL; 205216cdcec7SMiao Xie goto fail_alloc; 2053f2b636e8SJosef Bacik } 205461d92c32SChris Mason 205561d92c32SChris Mason btrfs_init_workers(&fs_info->generic_worker, 205661d92c32SChris Mason "genwork", 1, NULL); 205761d92c32SChris Mason 20585443be45SChris Mason btrfs_init_workers(&fs_info->workers, "worker", 205961d92c32SChris Mason fs_info->thread_pool_size, 206061d92c32SChris Mason &fs_info->generic_worker); 2061c8b97818SChris Mason 2062771ed689SChris Mason btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", 206361d92c32SChris Mason fs_info->thread_pool_size, 206461d92c32SChris Mason &fs_info->generic_worker); 2065771ed689SChris Mason 20665443be45SChris Mason btrfs_init_workers(&fs_info->submit_workers, "submit", 2067b720d209SChris Mason min_t(u64, fs_devices->num_devices, 206861d92c32SChris Mason fs_info->thread_pool_size), 206961d92c32SChris Mason &fs_info->generic_worker); 207061b49440SChris Mason 2071bab39bf9SJosef Bacik btrfs_init_workers(&fs_info->caching_workers, "cache", 2072bab39bf9SJosef Bacik 2, &fs_info->generic_worker); 2073bab39bf9SJosef Bacik 207461b49440SChris Mason /* a higher idle thresh on the submit workers makes it much more 207561b49440SChris Mason * likely that bios will be send down in a sane order to the 207661b49440SChris Mason * devices 207761b49440SChris Mason */ 207861b49440SChris Mason fs_info->submit_workers.idle_thresh = 64; 207953863232SChris Mason 2080771ed689SChris Mason fs_info->workers.idle_thresh = 16; 20814a69a410SChris Mason fs_info->workers.ordered = 1; 208261b49440SChris Mason 2083771ed689SChris Mason fs_info->delalloc_workers.idle_thresh = 2; 2084771ed689SChris Mason fs_info->delalloc_workers.ordered = 1; 2085771ed689SChris Mason 208661d92c32SChris Mason btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, 208761d92c32SChris Mason &fs_info->generic_worker); 20885443be45SChris Mason btrfs_init_workers(&fs_info->endio_workers, "endio", 208961d92c32SChris Mason fs_info->thread_pool_size, 209061d92c32SChris Mason &fs_info->generic_worker); 2091d20f7043SChris Mason btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", 209261d92c32SChris Mason fs_info->thread_pool_size, 209361d92c32SChris Mason &fs_info->generic_worker); 2094cad321adSChris Mason btrfs_init_workers(&fs_info->endio_meta_write_workers, 209561d92c32SChris Mason "endio-meta-write", fs_info->thread_pool_size, 209661d92c32SChris Mason &fs_info->generic_worker); 20975443be45SChris Mason btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", 209861d92c32SChris Mason fs_info->thread_pool_size, 209961d92c32SChris Mason &fs_info->generic_worker); 21000cb59c99SJosef Bacik btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write", 21010cb59c99SJosef Bacik 1, &fs_info->generic_worker); 210216cdcec7SMiao Xie btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta", 210316cdcec7SMiao Xie fs_info->thread_pool_size, 210416cdcec7SMiao Xie &fs_info->generic_worker); 210561b49440SChris Mason 210661b49440SChris Mason /* 210761b49440SChris Mason * endios are largely parallel and should have a very 210861b49440SChris Mason * low idle thresh 210961b49440SChris Mason */ 211061b49440SChris Mason fs_info->endio_workers.idle_thresh = 4; 2111b51912c9SChris Mason fs_info->endio_meta_workers.idle_thresh = 4; 2112b51912c9SChris Mason 21139042846bSChris Mason fs_info->endio_write_workers.idle_thresh = 2; 21149042846bSChris Mason fs_info->endio_meta_write_workers.idle_thresh = 2; 21159042846bSChris Mason 21164543df7eSChris Mason btrfs_start_workers(&fs_info->workers, 1); 211761d92c32SChris Mason btrfs_start_workers(&fs_info->generic_worker, 1); 21181cc127b5SChris Mason btrfs_start_workers(&fs_info->submit_workers, 1); 2119771ed689SChris Mason btrfs_start_workers(&fs_info->delalloc_workers, 1); 2120247e743cSChris Mason btrfs_start_workers(&fs_info->fixup_workers, 1); 21219042846bSChris Mason btrfs_start_workers(&fs_info->endio_workers, 1); 21229042846bSChris Mason btrfs_start_workers(&fs_info->endio_meta_workers, 1); 21239042846bSChris Mason btrfs_start_workers(&fs_info->endio_meta_write_workers, 1); 21249042846bSChris Mason btrfs_start_workers(&fs_info->endio_write_workers, 1); 21250cb59c99SJosef Bacik btrfs_start_workers(&fs_info->endio_freespace_worker, 1); 212616cdcec7SMiao Xie btrfs_start_workers(&fs_info->delayed_workers, 1); 2127bab39bf9SJosef Bacik btrfs_start_workers(&fs_info->caching_workers, 1); 21284543df7eSChris Mason 21294575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 2130c8b97818SChris Mason fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, 2131c8b97818SChris Mason 4 * 1024 * 1024 / PAGE_CACHE_SIZE); 21324575c9ccSChris Mason 2133db94535dSChris Mason nodesize = btrfs_super_nodesize(disk_super); 2134db94535dSChris Mason leafsize = btrfs_super_leafsize(disk_super); 2135db94535dSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 213687ee04ebSChris Mason stripesize = btrfs_super_stripesize(disk_super); 2137db94535dSChris Mason tree_root->nodesize = nodesize; 2138db94535dSChris Mason tree_root->leafsize = leafsize; 2139db94535dSChris Mason tree_root->sectorsize = sectorsize; 214087ee04ebSChris Mason tree_root->stripesize = stripesize; 2141a061fc8dSChris Mason 2142a061fc8dSChris Mason sb->s_blocksize = sectorsize; 2143a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 2144db94535dSChris Mason 214539279cc3SChris Mason if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, 214639279cc3SChris Mason sizeof(disk_super->magic))) { 2147d397712bSChris Mason printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id); 214839279cc3SChris Mason goto fail_sb_buffer; 214939279cc3SChris Mason } 215019c00ddcSChris Mason 2151925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 2152e4404d6eSYan Zheng ret = btrfs_read_sys_array(tree_root); 2153925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 215484eed90fSChris Mason if (ret) { 2155d397712bSChris Mason printk(KERN_WARNING "btrfs: failed to read the system " 2156d397712bSChris Mason "array on %s\n", sb->s_id); 21575d4f98a2SYan Zheng goto fail_sb_buffer; 215884eed90fSChris Mason } 21590b86a832SChris Mason 21600b86a832SChris Mason blocksize = btrfs_level_size(tree_root, 21610b86a832SChris Mason btrfs_super_chunk_root_level(disk_super)); 216284234f3aSYan Zheng generation = btrfs_super_chunk_root_generation(disk_super); 21630b86a832SChris Mason 21640b86a832SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 21650b86a832SChris Mason chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); 21660b86a832SChris Mason 21670b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 21680b86a832SChris Mason btrfs_super_chunk_root(disk_super), 216984234f3aSYan Zheng blocksize, generation); 21700b86a832SChris Mason BUG_ON(!chunk_root->node); 217183121942SDavid Woodhouse if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { 217283121942SDavid Woodhouse printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", 217383121942SDavid Woodhouse sb->s_id); 2174af31f5e5SChris Mason goto fail_tree_roots; 217583121942SDavid Woodhouse } 21765d4f98a2SYan Zheng btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); 21775d4f98a2SYan Zheng chunk_root->commit_root = btrfs_root_node(chunk_root); 21780b86a832SChris Mason 2179e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 2180e17cade2SChris Mason (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), 2181e17cade2SChris Mason BTRFS_UUID_SIZE); 2182e17cade2SChris Mason 2183925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 21840b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 2185925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 21862b82032cSYan Zheng if (ret) { 2187d397712bSChris Mason printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n", 2188d397712bSChris Mason sb->s_id); 2189af31f5e5SChris Mason goto fail_tree_roots; 21902b82032cSYan Zheng } 21910b86a832SChris Mason 2192dfe25020SChris Mason btrfs_close_extra_devices(fs_devices); 2193dfe25020SChris Mason 2194af31f5e5SChris Mason retry_root_backup: 2195db94535dSChris Mason blocksize = btrfs_level_size(tree_root, 2196db94535dSChris Mason btrfs_super_root_level(disk_super)); 219784234f3aSYan Zheng generation = btrfs_super_generation(disk_super); 21980b86a832SChris Mason 2199e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 2200db94535dSChris Mason btrfs_super_root(disk_super), 220184234f3aSYan Zheng blocksize, generation); 2202af31f5e5SChris Mason if (!tree_root->node || 2203af31f5e5SChris Mason !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { 220483121942SDavid Woodhouse printk(KERN_WARNING "btrfs: failed to read tree root on %s\n", 220583121942SDavid Woodhouse sb->s_id); 2206af31f5e5SChris Mason 2207af31f5e5SChris Mason goto recovery_tree_root; 220883121942SDavid Woodhouse } 2209af31f5e5SChris Mason 22105d4f98a2SYan Zheng btrfs_set_root_node(&tree_root->root_item, tree_root->node); 22115d4f98a2SYan Zheng tree_root->commit_root = btrfs_root_node(tree_root); 2212db94535dSChris Mason 2213db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 2214e20d96d6SChris Mason BTRFS_EXTENT_TREE_OBJECTID, extent_root); 22150b86a832SChris Mason if (ret) 2216af31f5e5SChris Mason goto recovery_tree_root; 22170b86a832SChris Mason extent_root->track_dirty = 1; 22180b86a832SChris Mason 22190b86a832SChris Mason ret = find_and_setup_root(tree_root, fs_info, 22200b86a832SChris Mason BTRFS_DEV_TREE_OBJECTID, dev_root); 22210b86a832SChris Mason if (ret) 2222af31f5e5SChris Mason goto recovery_tree_root; 22235d4f98a2SYan Zheng dev_root->track_dirty = 1; 22243768f368SChris Mason 2225d20f7043SChris Mason ret = find_and_setup_root(tree_root, fs_info, 2226d20f7043SChris Mason BTRFS_CSUM_TREE_OBJECTID, csum_root); 2227d20f7043SChris Mason if (ret) 2228af31f5e5SChris Mason goto recovery_tree_root; 2229d20f7043SChris Mason 2230d20f7043SChris Mason csum_root->track_dirty = 1; 2231d20f7043SChris Mason 22328929ecfaSYan, Zheng fs_info->generation = generation; 22338929ecfaSYan, Zheng fs_info->last_trans_committed = generation; 22348929ecfaSYan, Zheng fs_info->data_alloc_profile = (u64)-1; 22358929ecfaSYan, Zheng fs_info->metadata_alloc_profile = (u64)-1; 22368929ecfaSYan, Zheng fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; 22378929ecfaSYan, Zheng 2238c59021f8Sliubo ret = btrfs_init_space_info(fs_info); 2239c59021f8Sliubo if (ret) { 2240c59021f8Sliubo printk(KERN_ERR "Failed to initial space info: %d\n", ret); 2241c59021f8Sliubo goto fail_block_groups; 2242c59021f8Sliubo } 2243c59021f8Sliubo 22441b1d1f66SJosef Bacik ret = btrfs_read_block_groups(extent_root); 22451b1d1f66SJosef Bacik if (ret) { 22461b1d1f66SJosef Bacik printk(KERN_ERR "Failed to read block groups: %d\n", ret); 22471b1d1f66SJosef Bacik goto fail_block_groups; 22481b1d1f66SJosef Bacik } 22499078a3e1SChris Mason 2250a74a4b97SChris Mason fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, 2251a74a4b97SChris Mason "btrfs-cleaner"); 225257506d50SQinghuang Feng if (IS_ERR(fs_info->cleaner_kthread)) 22531b1d1f66SJosef Bacik goto fail_block_groups; 2254a74a4b97SChris Mason 2255a74a4b97SChris Mason fs_info->transaction_kthread = kthread_run(transaction_kthread, 2256a74a4b97SChris Mason tree_root, 2257a74a4b97SChris Mason "btrfs-transaction"); 225857506d50SQinghuang Feng if (IS_ERR(fs_info->transaction_kthread)) 22593f157a2fSChris Mason goto fail_cleaner; 2260a74a4b97SChris Mason 2261c289811cSChris Mason if (!btrfs_test_opt(tree_root, SSD) && 2262c289811cSChris Mason !btrfs_test_opt(tree_root, NOSSD) && 2263c289811cSChris Mason !fs_info->fs_devices->rotating) { 2264c289811cSChris Mason printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD " 2265c289811cSChris Mason "mode\n"); 2266c289811cSChris Mason btrfs_set_opt(fs_info->mount_opt, SSD); 2267c289811cSChris Mason } 2268c289811cSChris Mason 2269acce952bSliubo /* do not make disk changes in broken FS */ 2270acce952bSliubo if (btrfs_super_log_root(disk_super) != 0 && 2271acce952bSliubo !(fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)) { 2272e02119d5SChris Mason u64 bytenr = btrfs_super_log_root(disk_super); 2273d18a2c44SChris Mason 22747c2ca468SChris Mason if (fs_devices->rw_devices == 0) { 2275d397712bSChris Mason printk(KERN_WARNING "Btrfs log replay required " 2276d397712bSChris Mason "on RO media\n"); 22777c2ca468SChris Mason err = -EIO; 22787c2ca468SChris Mason goto fail_trans_kthread; 22797c2ca468SChris Mason } 2280e02119d5SChris Mason blocksize = 2281e02119d5SChris Mason btrfs_level_size(tree_root, 2282e02119d5SChris Mason btrfs_super_log_root_level(disk_super)); 2283e02119d5SChris Mason 2284676e4c86SDan Carpenter log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); 2285676e4c86SDan Carpenter if (!log_tree_root) { 2286676e4c86SDan Carpenter err = -ENOMEM; 2287676e4c86SDan Carpenter goto fail_trans_kthread; 2288676e4c86SDan Carpenter } 2289e02119d5SChris Mason 2290e02119d5SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 2291e02119d5SChris Mason log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); 2292e02119d5SChris Mason 2293e02119d5SChris Mason log_tree_root->node = read_tree_block(tree_root, bytenr, 229484234f3aSYan Zheng blocksize, 229584234f3aSYan Zheng generation + 1); 2296e02119d5SChris Mason ret = btrfs_recover_log_trees(log_tree_root); 2297e02119d5SChris Mason BUG_ON(ret); 2298e556ce2cSYan Zheng 2299e556ce2cSYan Zheng if (sb->s_flags & MS_RDONLY) { 2300e556ce2cSYan Zheng ret = btrfs_commit_super(tree_root); 2301e556ce2cSYan Zheng BUG_ON(ret); 2302e556ce2cSYan Zheng } 2303e02119d5SChris Mason } 23041a40e23bSZheng Yan 230576dda93cSYan, Zheng ret = btrfs_find_orphan_roots(tree_root); 230676dda93cSYan, Zheng BUG_ON(ret); 230776dda93cSYan, Zheng 23087c2ca468SChris Mason if (!(sb->s_flags & MS_RDONLY)) { 2309d68fc57bSYan, Zheng ret = btrfs_cleanup_fs_roots(fs_info); 2310d68fc57bSYan, Zheng BUG_ON(ret); 2311d68fc57bSYan, Zheng 23125d4f98a2SYan Zheng ret = btrfs_recover_relocation(tree_root); 2313d7ce5843SMiao Xie if (ret < 0) { 2314d7ce5843SMiao Xie printk(KERN_WARNING 2315d7ce5843SMiao Xie "btrfs: failed to recover relocation\n"); 2316d7ce5843SMiao Xie err = -EINVAL; 2317d7ce5843SMiao Xie goto fail_trans_kthread; 2318d7ce5843SMiao Xie } 23197c2ca468SChris Mason } 23201a40e23bSZheng Yan 23213de4586cSChris Mason location.objectid = BTRFS_FS_TREE_OBJECTID; 23223de4586cSChris Mason location.type = BTRFS_ROOT_ITEM_KEY; 23233de4586cSChris Mason location.offset = (u64)-1; 23243de4586cSChris Mason 23253de4586cSChris Mason fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); 23263de4586cSChris Mason if (!fs_info->fs_root) 23277c2ca468SChris Mason goto fail_trans_kthread; 23283140c9a3SDan Carpenter if (IS_ERR(fs_info->fs_root)) { 23293140c9a3SDan Carpenter err = PTR_ERR(fs_info->fs_root); 23303140c9a3SDan Carpenter goto fail_trans_kthread; 23313140c9a3SDan Carpenter } 2332c289811cSChris Mason 2333e3acc2a6SJosef Bacik if (!(sb->s_flags & MS_RDONLY)) { 2334e3acc2a6SJosef Bacik down_read(&fs_info->cleanup_work_sem); 233566b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_info->fs_root); 233666b4ffd1SJosef Bacik if (!err) 233766b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_info->tree_root); 2338e3acc2a6SJosef Bacik up_read(&fs_info->cleanup_work_sem); 233966b4ffd1SJosef Bacik if (err) { 234066b4ffd1SJosef Bacik close_ctree(tree_root); 234166b4ffd1SJosef Bacik return ERR_PTR(err); 234266b4ffd1SJosef Bacik } 2343e3acc2a6SJosef Bacik } 2344e3acc2a6SJosef Bacik 23450f7d52f4SChris Mason return tree_root; 234639279cc3SChris Mason 23477c2ca468SChris Mason fail_trans_kthread: 23487c2ca468SChris Mason kthread_stop(fs_info->transaction_kthread); 23493f157a2fSChris Mason fail_cleaner: 2350a74a4b97SChris Mason kthread_stop(fs_info->cleaner_kthread); 23517c2ca468SChris Mason 23527c2ca468SChris Mason /* 23537c2ca468SChris Mason * make sure we're done with the btree inode before we stop our 23547c2ca468SChris Mason * kthreads 23557c2ca468SChris Mason */ 23567c2ca468SChris Mason filemap_write_and_wait(fs_info->btree_inode->i_mapping); 23577c2ca468SChris Mason invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 23587c2ca468SChris Mason 23591b1d1f66SJosef Bacik fail_block_groups: 23601b1d1f66SJosef Bacik btrfs_free_block_groups(fs_info); 2361af31f5e5SChris Mason 2362af31f5e5SChris Mason fail_tree_roots: 2363af31f5e5SChris Mason free_root_pointers(fs_info, 1); 2364af31f5e5SChris Mason 236539279cc3SChris Mason fail_sb_buffer: 236661d92c32SChris Mason btrfs_stop_workers(&fs_info->generic_worker); 2367247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 2368771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 23698b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 23708b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 2371d20f7043SChris Mason btrfs_stop_workers(&fs_info->endio_meta_workers); 2372cad321adSChris Mason btrfs_stop_workers(&fs_info->endio_meta_write_workers); 2373e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 23740cb59c99SJosef Bacik btrfs_stop_workers(&fs_info->endio_freespace_worker); 23751cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 237616cdcec7SMiao Xie btrfs_stop_workers(&fs_info->delayed_workers); 2377bab39bf9SJosef Bacik btrfs_stop_workers(&fs_info->caching_workers); 237816cdcec7SMiao Xie fail_alloc: 23794543df7eSChris Mason fail_iput: 23807c2ca468SChris Mason invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 23814543df7eSChris Mason iput(fs_info->btree_inode); 23827e662854SQinghuang Feng 2383dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 238484eed90fSChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 2385ad081f14SJens Axboe fail_bdi: 23867e662854SQinghuang Feng bdi_destroy(&fs_info->bdi); 238776dda93cSYan, Zheng fail_srcu: 238876dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 23897e662854SQinghuang Feng fail: 23906c41761fSDavid Sterba free_fs_info(fs_info); 239139279cc3SChris Mason return ERR_PTR(err); 2392af31f5e5SChris Mason 2393af31f5e5SChris Mason recovery_tree_root: 2394af31f5e5SChris Mason 2395af31f5e5SChris Mason if (!btrfs_test_opt(tree_root, RECOVERY)) 2396af31f5e5SChris Mason goto fail_tree_roots; 2397af31f5e5SChris Mason 2398af31f5e5SChris Mason free_root_pointers(fs_info, 0); 2399af31f5e5SChris Mason 2400af31f5e5SChris Mason /* don't use the log in recovery mode, it won't be valid */ 2401af31f5e5SChris Mason btrfs_set_super_log_root(disk_super, 0); 2402af31f5e5SChris Mason 2403af31f5e5SChris Mason /* we can't trust the free space cache either */ 2404af31f5e5SChris Mason btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE); 2405af31f5e5SChris Mason 2406af31f5e5SChris Mason ret = next_root_backup(fs_info, fs_info->super_copy, 2407af31f5e5SChris Mason &num_backups_tried, &backup_index); 2408af31f5e5SChris Mason if (ret == -1) 2409af31f5e5SChris Mason goto fail_block_groups; 2410af31f5e5SChris Mason goto retry_root_backup; 2411eb60ceacSChris Mason } 2412eb60ceacSChris Mason 2413f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 2414f2984462SChris Mason { 2415f2984462SChris Mason char b[BDEVNAME_SIZE]; 2416f2984462SChris Mason 2417f2984462SChris Mason if (uptodate) { 2418f2984462SChris Mason set_buffer_uptodate(bh); 2419f2984462SChris Mason } else { 24207a36ddecSDavid Sterba printk_ratelimited(KERN_WARNING "lost page write due to " 2421f2984462SChris Mason "I/O error on %s\n", 2422f2984462SChris Mason bdevname(bh->b_bdev, b)); 24231259ab75SChris Mason /* note, we dont' set_buffer_write_io_error because we have 24241259ab75SChris Mason * our own ways of dealing with the IO errors 24251259ab75SChris Mason */ 2426f2984462SChris Mason clear_buffer_uptodate(bh); 2427f2984462SChris Mason } 2428f2984462SChris Mason unlock_buffer(bh); 2429f2984462SChris Mason put_bh(bh); 2430f2984462SChris Mason } 2431f2984462SChris Mason 2432a512bbf8SYan Zheng struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) 2433a512bbf8SYan Zheng { 2434a512bbf8SYan Zheng struct buffer_head *bh; 2435a512bbf8SYan Zheng struct buffer_head *latest = NULL; 2436a512bbf8SYan Zheng struct btrfs_super_block *super; 2437a512bbf8SYan Zheng int i; 2438a512bbf8SYan Zheng u64 transid = 0; 2439a512bbf8SYan Zheng u64 bytenr; 2440a512bbf8SYan Zheng 2441a512bbf8SYan Zheng /* we would like to check all the supers, but that would make 2442a512bbf8SYan Zheng * a btrfs mount succeed after a mkfs from a different FS. 2443a512bbf8SYan Zheng * So, we need to add a special mount option to scan for 2444a512bbf8SYan Zheng * later supers, using BTRFS_SUPER_MIRROR_MAX instead 2445a512bbf8SYan Zheng */ 2446a512bbf8SYan Zheng for (i = 0; i < 1; i++) { 2447a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2448a512bbf8SYan Zheng if (bytenr + 4096 >= i_size_read(bdev->bd_inode)) 2449a512bbf8SYan Zheng break; 2450a512bbf8SYan Zheng bh = __bread(bdev, bytenr / 4096, 4096); 2451a512bbf8SYan Zheng if (!bh) 2452a512bbf8SYan Zheng continue; 2453a512bbf8SYan Zheng 2454a512bbf8SYan Zheng super = (struct btrfs_super_block *)bh->b_data; 2455a512bbf8SYan Zheng if (btrfs_super_bytenr(super) != bytenr || 2456a512bbf8SYan Zheng strncmp((char *)(&super->magic), BTRFS_MAGIC, 2457a512bbf8SYan Zheng sizeof(super->magic))) { 2458a512bbf8SYan Zheng brelse(bh); 2459a512bbf8SYan Zheng continue; 2460a512bbf8SYan Zheng } 2461a512bbf8SYan Zheng 2462a512bbf8SYan Zheng if (!latest || btrfs_super_generation(super) > transid) { 2463a512bbf8SYan Zheng brelse(latest); 2464a512bbf8SYan Zheng latest = bh; 2465a512bbf8SYan Zheng transid = btrfs_super_generation(super); 2466a512bbf8SYan Zheng } else { 2467a512bbf8SYan Zheng brelse(bh); 2468a512bbf8SYan Zheng } 2469a512bbf8SYan Zheng } 2470a512bbf8SYan Zheng return latest; 2471a512bbf8SYan Zheng } 2472a512bbf8SYan Zheng 24734eedeb75SHisashi Hifumi /* 24744eedeb75SHisashi Hifumi * this should be called twice, once with wait == 0 and 24754eedeb75SHisashi Hifumi * once with wait == 1. When wait == 0 is done, all the buffer heads 24764eedeb75SHisashi Hifumi * we write are pinned. 24774eedeb75SHisashi Hifumi * 24784eedeb75SHisashi Hifumi * They are released when wait == 1 is done. 24794eedeb75SHisashi Hifumi * max_mirrors must be the same for both runs, and it indicates how 24804eedeb75SHisashi Hifumi * many supers on this one device should be written. 24814eedeb75SHisashi Hifumi * 24824eedeb75SHisashi Hifumi * max_mirrors == 0 means to write them all. 24834eedeb75SHisashi Hifumi */ 2484a512bbf8SYan Zheng static int write_dev_supers(struct btrfs_device *device, 2485a512bbf8SYan Zheng struct btrfs_super_block *sb, 2486a512bbf8SYan Zheng int do_barriers, int wait, int max_mirrors) 2487a512bbf8SYan Zheng { 2488a512bbf8SYan Zheng struct buffer_head *bh; 2489a512bbf8SYan Zheng int i; 2490a512bbf8SYan Zheng int ret; 2491a512bbf8SYan Zheng int errors = 0; 2492a512bbf8SYan Zheng u32 crc; 2493a512bbf8SYan Zheng u64 bytenr; 2494a512bbf8SYan Zheng int last_barrier = 0; 2495a512bbf8SYan Zheng 2496a512bbf8SYan Zheng if (max_mirrors == 0) 2497a512bbf8SYan Zheng max_mirrors = BTRFS_SUPER_MIRROR_MAX; 2498a512bbf8SYan Zheng 2499a512bbf8SYan Zheng /* make sure only the last submit_bh does a barrier */ 2500a512bbf8SYan Zheng if (do_barriers) { 2501a512bbf8SYan Zheng for (i = 0; i < max_mirrors; i++) { 2502a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2503a512bbf8SYan Zheng if (bytenr + BTRFS_SUPER_INFO_SIZE >= 2504a512bbf8SYan Zheng device->total_bytes) 2505a512bbf8SYan Zheng break; 2506a512bbf8SYan Zheng last_barrier = i; 2507a512bbf8SYan Zheng } 2508a512bbf8SYan Zheng } 2509a512bbf8SYan Zheng 2510a512bbf8SYan Zheng for (i = 0; i < max_mirrors; i++) { 2511a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2512a512bbf8SYan Zheng if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) 2513a512bbf8SYan Zheng break; 2514a512bbf8SYan Zheng 2515a512bbf8SYan Zheng if (wait) { 2516a512bbf8SYan Zheng bh = __find_get_block(device->bdev, bytenr / 4096, 2517a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 2518a512bbf8SYan Zheng BUG_ON(!bh); 2519a512bbf8SYan Zheng wait_on_buffer(bh); 25204eedeb75SHisashi Hifumi if (!buffer_uptodate(bh)) 25214eedeb75SHisashi Hifumi errors++; 25224eedeb75SHisashi Hifumi 25234eedeb75SHisashi Hifumi /* drop our reference */ 25244eedeb75SHisashi Hifumi brelse(bh); 25254eedeb75SHisashi Hifumi 25264eedeb75SHisashi Hifumi /* drop the reference from the wait == 0 run */ 2527a512bbf8SYan Zheng brelse(bh); 2528a512bbf8SYan Zheng continue; 2529a512bbf8SYan Zheng } else { 2530a512bbf8SYan Zheng btrfs_set_super_bytenr(sb, bytenr); 2531a512bbf8SYan Zheng 2532a512bbf8SYan Zheng crc = ~(u32)0; 2533a512bbf8SYan Zheng crc = btrfs_csum_data(NULL, (char *)sb + 2534a512bbf8SYan Zheng BTRFS_CSUM_SIZE, crc, 2535a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE - 2536a512bbf8SYan Zheng BTRFS_CSUM_SIZE); 2537a512bbf8SYan Zheng btrfs_csum_final(crc, sb->csum); 2538a512bbf8SYan Zheng 25394eedeb75SHisashi Hifumi /* 25404eedeb75SHisashi Hifumi * one reference for us, and we leave it for the 25414eedeb75SHisashi Hifumi * caller 25424eedeb75SHisashi Hifumi */ 2543a512bbf8SYan Zheng bh = __getblk(device->bdev, bytenr / 4096, 2544a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 2545a512bbf8SYan Zheng memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 2546a512bbf8SYan Zheng 25474eedeb75SHisashi Hifumi /* one reference for submit_bh */ 2548a512bbf8SYan Zheng get_bh(bh); 25494eedeb75SHisashi Hifumi 25504eedeb75SHisashi Hifumi set_buffer_uptodate(bh); 2551a512bbf8SYan Zheng lock_buffer(bh); 2552a512bbf8SYan Zheng bh->b_end_io = btrfs_end_buffer_write_sync; 2553a512bbf8SYan Zheng } 2554a512bbf8SYan Zheng 2555c3b9a62cSChristoph Hellwig if (i == last_barrier && do_barriers) 2556c3b9a62cSChristoph Hellwig ret = submit_bh(WRITE_FLUSH_FUA, bh); 2557c3b9a62cSChristoph Hellwig else 2558ffbd517dSChris Mason ret = submit_bh(WRITE_SYNC, bh); 2559a512bbf8SYan Zheng 25604eedeb75SHisashi Hifumi if (ret) 2561a512bbf8SYan Zheng errors++; 2562a512bbf8SYan Zheng } 2563a512bbf8SYan Zheng return errors < i ? 0 : -1; 2564a512bbf8SYan Zheng } 2565a512bbf8SYan Zheng 2566a512bbf8SYan Zheng int write_all_supers(struct btrfs_root *root, int max_mirrors) 2567f2984462SChris Mason { 2568e5e9a520SChris Mason struct list_head *head; 2569f2984462SChris Mason struct btrfs_device *dev; 2570a061fc8dSChris Mason struct btrfs_super_block *sb; 2571f2984462SChris Mason struct btrfs_dev_item *dev_item; 2572f2984462SChris Mason int ret; 2573f2984462SChris Mason int do_barriers; 2574a236aed1SChris Mason int max_errors; 2575a236aed1SChris Mason int total_errors = 0; 2576a061fc8dSChris Mason u64 flags; 2577f2984462SChris Mason 25786c41761fSDavid Sterba max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1; 2579f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 2580af31f5e5SChris Mason backup_super_roots(root->fs_info); 2581f2984462SChris Mason 25826c41761fSDavid Sterba sb = root->fs_info->super_for_commit; 2583a061fc8dSChris Mason dev_item = &sb->dev_item; 2584e5e9a520SChris Mason 2585174ba509SChris Mason mutex_lock(&root->fs_info->fs_devices->device_list_mutex); 2586e5e9a520SChris Mason head = &root->fs_info->fs_devices->devices; 25871f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 2588dfe25020SChris Mason if (!dev->bdev) { 2589dfe25020SChris Mason total_errors++; 2590dfe25020SChris Mason continue; 2591dfe25020SChris Mason } 25922b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 2593dfe25020SChris Mason continue; 2594dfe25020SChris Mason 25952b82032cSYan Zheng btrfs_set_stack_device_generation(dev_item, 0); 2596a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 2597a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 2598a061fc8dSChris Mason btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); 2599a061fc8dSChris Mason btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); 2600a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 2601a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 2602a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 2603a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 26042b82032cSYan Zheng memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 2605a512bbf8SYan Zheng 2606a061fc8dSChris Mason flags = btrfs_super_flags(sb); 2607a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 2608f2984462SChris Mason 2609a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); 2610a236aed1SChris Mason if (ret) 2611a236aed1SChris Mason total_errors++; 2612f2984462SChris Mason } 2613a236aed1SChris Mason if (total_errors > max_errors) { 2614d397712bSChris Mason printk(KERN_ERR "btrfs: %d errors while writing supers\n", 2615d397712bSChris Mason total_errors); 2616a236aed1SChris Mason BUG(); 2617a236aed1SChris Mason } 2618f2984462SChris Mason 2619a512bbf8SYan Zheng total_errors = 0; 26201f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 2621dfe25020SChris Mason if (!dev->bdev) 2622dfe25020SChris Mason continue; 26232b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 2624dfe25020SChris Mason continue; 2625dfe25020SChris Mason 2626a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); 2627a512bbf8SYan Zheng if (ret) 26281259ab75SChris Mason total_errors++; 2629f2984462SChris Mason } 2630174ba509SChris Mason mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); 2631a236aed1SChris Mason if (total_errors > max_errors) { 2632d397712bSChris Mason printk(KERN_ERR "btrfs: %d errors while writing supers\n", 2633d397712bSChris Mason total_errors); 2634a236aed1SChris Mason BUG(); 2635a236aed1SChris Mason } 2636f2984462SChris Mason return 0; 2637f2984462SChris Mason } 2638f2984462SChris Mason 2639a512bbf8SYan Zheng int write_ctree_super(struct btrfs_trans_handle *trans, 2640a512bbf8SYan Zheng struct btrfs_root *root, int max_mirrors) 2641cfaa7295SChris Mason { 2642e66f709bSChris Mason int ret; 26432c90e5d6SChris Mason 2644a512bbf8SYan Zheng ret = write_all_supers(root, max_mirrors); 26455f39d397SChris Mason return ret; 2646cfaa7295SChris Mason } 2647cfaa7295SChris Mason 26485eda7b5eSChris Mason int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) 26492619ba1fSChris Mason { 26504df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 26512619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 26522619ba1fSChris Mason (unsigned long)root->root_key.objectid); 26534df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 265476dda93cSYan, Zheng 265576dda93cSYan, Zheng if (btrfs_root_refs(&root->root_item) == 0) 265676dda93cSYan, Zheng synchronize_srcu(&fs_info->subvol_srcu); 265776dda93cSYan, Zheng 2658581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_pinned); 2659581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_ctl); 26604df27c4dSYan, Zheng free_fs_root(root); 26614df27c4dSYan, Zheng return 0; 26624df27c4dSYan, Zheng } 26634df27c4dSYan, Zheng 26644df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root) 26654df27c4dSYan, Zheng { 266682d5902dSLi Zefan iput(root->cache_inode); 26674df27c4dSYan, Zheng WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); 26680ee5dc67SAl Viro if (root->anon_dev) 26690ee5dc67SAl Viro free_anon_bdev(root->anon_dev); 26705f39d397SChris Mason free_extent_buffer(root->node); 26715f39d397SChris Mason free_extent_buffer(root->commit_root); 2672581bb050SLi Zefan kfree(root->free_ino_ctl); 2673581bb050SLi Zefan kfree(root->free_ino_pinned); 267458176a96SJosef Bacik kfree(root->name); 26752619ba1fSChris Mason kfree(root); 26762619ba1fSChris Mason } 26772619ba1fSChris Mason 267835b7e476SChris Mason static int del_fs_roots(struct btrfs_fs_info *fs_info) 26790f7d52f4SChris Mason { 26800f7d52f4SChris Mason int ret; 26810f7d52f4SChris Mason struct btrfs_root *gang[8]; 26820f7d52f4SChris Mason int i; 26830f7d52f4SChris Mason 268476dda93cSYan, Zheng while (!list_empty(&fs_info->dead_roots)) { 268576dda93cSYan, Zheng gang[0] = list_entry(fs_info->dead_roots.next, 268676dda93cSYan, Zheng struct btrfs_root, root_list); 268776dda93cSYan, Zheng list_del(&gang[0]->root_list); 268876dda93cSYan, Zheng 268976dda93cSYan, Zheng if (gang[0]->in_radix) { 269076dda93cSYan, Zheng btrfs_free_fs_root(fs_info, gang[0]); 269176dda93cSYan, Zheng } else { 269276dda93cSYan, Zheng free_extent_buffer(gang[0]->node); 269376dda93cSYan, Zheng free_extent_buffer(gang[0]->commit_root); 269476dda93cSYan, Zheng kfree(gang[0]); 269576dda93cSYan, Zheng } 269676dda93cSYan, Zheng } 269776dda93cSYan, Zheng 26980f7d52f4SChris Mason while (1) { 26990f7d52f4SChris Mason ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 27000f7d52f4SChris Mason (void **)gang, 0, 27010f7d52f4SChris Mason ARRAY_SIZE(gang)); 27020f7d52f4SChris Mason if (!ret) 27030f7d52f4SChris Mason break; 27042619ba1fSChris Mason for (i = 0; i < ret; i++) 27055eda7b5eSChris Mason btrfs_free_fs_root(fs_info, gang[i]); 27060f7d52f4SChris Mason } 27070f7d52f4SChris Mason return 0; 27080f7d52f4SChris Mason } 2709b4100d64SChris Mason 2710c146afadSYan Zheng int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) 2711c146afadSYan Zheng { 2712c146afadSYan Zheng u64 root_objectid = 0; 2713c146afadSYan Zheng struct btrfs_root *gang[8]; 2714c146afadSYan Zheng int i; 2715c146afadSYan Zheng int ret; 2716c146afadSYan Zheng 2717c146afadSYan Zheng while (1) { 2718c146afadSYan Zheng ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 2719c146afadSYan Zheng (void **)gang, root_objectid, 2720c146afadSYan Zheng ARRAY_SIZE(gang)); 2721c146afadSYan Zheng if (!ret) 2722c146afadSYan Zheng break; 27235d4f98a2SYan Zheng 27245d4f98a2SYan Zheng root_objectid = gang[ret - 1]->root_key.objectid + 1; 2725c146afadSYan Zheng for (i = 0; i < ret; i++) { 272666b4ffd1SJosef Bacik int err; 272766b4ffd1SJosef Bacik 2728c146afadSYan Zheng root_objectid = gang[i]->root_key.objectid; 272966b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(gang[i]); 273066b4ffd1SJosef Bacik if (err) 273166b4ffd1SJosef Bacik return err; 2732c146afadSYan Zheng } 2733c146afadSYan Zheng root_objectid++; 2734c146afadSYan Zheng } 2735c146afadSYan Zheng return 0; 2736c146afadSYan Zheng } 2737c146afadSYan Zheng 2738c146afadSYan Zheng int btrfs_commit_super(struct btrfs_root *root) 2739c146afadSYan Zheng { 2740c146afadSYan Zheng struct btrfs_trans_handle *trans; 2741c146afadSYan Zheng int ret; 2742c146afadSYan Zheng 2743c146afadSYan Zheng mutex_lock(&root->fs_info->cleaner_mutex); 274424bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 2745c146afadSYan Zheng btrfs_clean_old_snapshots(root); 2746c146afadSYan Zheng mutex_unlock(&root->fs_info->cleaner_mutex); 2747c71bf099SYan, Zheng 2748c71bf099SYan, Zheng /* wait until ongoing cleanup work done */ 2749c71bf099SYan, Zheng down_write(&root->fs_info->cleanup_work_sem); 2750c71bf099SYan, Zheng up_write(&root->fs_info->cleanup_work_sem); 2751c71bf099SYan, Zheng 27527a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 27533612b495STsutomu Itoh if (IS_ERR(trans)) 27543612b495STsutomu Itoh return PTR_ERR(trans); 2755c146afadSYan Zheng ret = btrfs_commit_transaction(trans, root); 2756c146afadSYan Zheng BUG_ON(ret); 2757c146afadSYan Zheng /* run commit again to drop the original snapshot */ 27587a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 27593612b495STsutomu Itoh if (IS_ERR(trans)) 27603612b495STsutomu Itoh return PTR_ERR(trans); 2761c146afadSYan Zheng btrfs_commit_transaction(trans, root); 2762c146afadSYan Zheng ret = btrfs_write_and_wait_transaction(NULL, root); 2763c146afadSYan Zheng BUG_ON(ret); 2764c146afadSYan Zheng 2765a512bbf8SYan Zheng ret = write_ctree_super(NULL, root, 0); 2766c146afadSYan Zheng return ret; 2767c146afadSYan Zheng } 2768c146afadSYan Zheng 2769e20d96d6SChris Mason int close_ctree(struct btrfs_root *root) 2770eb60ceacSChris Mason { 27710f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 2772c146afadSYan Zheng int ret; 2773e089f05cSChris Mason 2774facda1e7SChris Mason fs_info->closing = 1; 2775a2135011SChris Mason smp_mb(); 2776a2135011SChris Mason 2777a2de733cSArne Jansen btrfs_scrub_cancel(root); 27784cb5300bSChris Mason 27794cb5300bSChris Mason /* wait for any defraggers to finish */ 27804cb5300bSChris Mason wait_event(fs_info->transaction_wait, 27814cb5300bSChris Mason (atomic_read(&fs_info->defrag_running) == 0)); 27824cb5300bSChris Mason 27834cb5300bSChris Mason /* clear out the rbtree of defraggable inodes */ 27844cb5300bSChris Mason btrfs_run_defrag_inodes(root->fs_info); 27854cb5300bSChris Mason 2786acce952bSliubo /* 2787acce952bSliubo * Here come 2 situations when btrfs is broken to flip readonly: 2788acce952bSliubo * 2789acce952bSliubo * 1. when btrfs flips readonly somewhere else before 2790acce952bSliubo * btrfs_commit_super, sb->s_flags has MS_RDONLY flag, 2791acce952bSliubo * and btrfs will skip to write sb directly to keep 2792acce952bSliubo * ERROR state on disk. 2793acce952bSliubo * 2794acce952bSliubo * 2. when btrfs flips readonly just in btrfs_commit_super, 2795ae0e47f0SJustin P. Mattock * and in such case, btrfs cannot write sb via btrfs_commit_super, 2796acce952bSliubo * and since fs_state has been set BTRFS_SUPER_FLAG_ERROR flag, 2797acce952bSliubo * btrfs will cleanup all FS resources first and write sb then. 2798acce952bSliubo */ 2799c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 2800c146afadSYan Zheng ret = btrfs_commit_super(root); 2801d397712bSChris Mason if (ret) 2802d397712bSChris Mason printk(KERN_ERR "btrfs: commit super ret %d\n", ret); 2803c146afadSYan Zheng } 2804ed2ff2cbSChris Mason 2805acce952bSliubo if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 2806acce952bSliubo ret = btrfs_error_commit_super(root); 2807acce952bSliubo if (ret) 2808acce952bSliubo printk(KERN_ERR "btrfs: commit super ret %d\n", ret); 2809acce952bSliubo } 2810acce952bSliubo 2811300e4f8aSJosef Bacik btrfs_put_block_group_cache(fs_info); 2812300e4f8aSJosef Bacik 28138929ecfaSYan, Zheng kthread_stop(root->fs_info->transaction_kthread); 28148929ecfaSYan, Zheng kthread_stop(root->fs_info->cleaner_kthread); 28158929ecfaSYan, Zheng 2816f25784b3SYan Zheng fs_info->closing = 2; 2817f25784b3SYan Zheng smp_mb(); 2818f25784b3SYan Zheng 2819b0c68f8bSChris Mason if (fs_info->delalloc_bytes) { 2820d397712bSChris Mason printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n", 282121380931SJoel Becker (unsigned long long)fs_info->delalloc_bytes); 2822b0c68f8bSChris Mason } 282331153d81SYan Zheng if (fs_info->total_ref_cache_size) { 2824d397712bSChris Mason printk(KERN_INFO "btrfs: at umount reference cache size %llu\n", 2825d397712bSChris Mason (unsigned long long)fs_info->total_ref_cache_size); 282631153d81SYan Zheng } 282731153d81SYan Zheng 28285f39d397SChris Mason free_extent_buffer(fs_info->extent_root->node); 28295d4f98a2SYan Zheng free_extent_buffer(fs_info->extent_root->commit_root); 28305f39d397SChris Mason free_extent_buffer(fs_info->tree_root->node); 28315d4f98a2SYan Zheng free_extent_buffer(fs_info->tree_root->commit_root); 28320b86a832SChris Mason free_extent_buffer(root->fs_info->chunk_root->node); 28335d4f98a2SYan Zheng free_extent_buffer(root->fs_info->chunk_root->commit_root); 28340b86a832SChris Mason free_extent_buffer(root->fs_info->dev_root->node); 28355d4f98a2SYan Zheng free_extent_buffer(root->fs_info->dev_root->commit_root); 2836d20f7043SChris Mason free_extent_buffer(root->fs_info->csum_root->node); 28375d4f98a2SYan Zheng free_extent_buffer(root->fs_info->csum_root->commit_root); 2838d20f7043SChris Mason 28399078a3e1SChris Mason btrfs_free_block_groups(root->fs_info); 2840c146afadSYan Zheng 28410f7d52f4SChris Mason del_fs_roots(fs_info); 2842d10c5f31SChris Mason 2843c146afadSYan Zheng iput(fs_info->btree_inode); 28449ad6b7bcSChris Mason 284561d92c32SChris Mason btrfs_stop_workers(&fs_info->generic_worker); 2846247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 2847771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 28488b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 28498b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 2850d20f7043SChris Mason btrfs_stop_workers(&fs_info->endio_meta_workers); 2851cad321adSChris Mason btrfs_stop_workers(&fs_info->endio_meta_write_workers); 2852e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 28530cb59c99SJosef Bacik btrfs_stop_workers(&fs_info->endio_freespace_worker); 28541cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 285516cdcec7SMiao Xie btrfs_stop_workers(&fs_info->delayed_workers); 2856bab39bf9SJosef Bacik btrfs_stop_workers(&fs_info->caching_workers); 2857d6bfde87SChris Mason 2858dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 28590b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 2860b248a415SChris Mason 286104160088SChris Mason bdi_destroy(&fs_info->bdi); 286276dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 28630b86a832SChris Mason 28646c41761fSDavid Sterba free_fs_info(fs_info); 286583a4d548SLi Zefan 2866eb60ceacSChris Mason return 0; 2867eb60ceacSChris Mason } 2868eb60ceacSChris Mason 28691259ab75SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) 2870ccd467d6SChris Mason { 28711259ab75SChris Mason int ret; 2872810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 28731259ab75SChris Mason 28742ac55d41SJosef Bacik ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf, 28752ac55d41SJosef Bacik NULL); 28761259ab75SChris Mason if (!ret) 28771259ab75SChris Mason return ret; 28781259ab75SChris Mason 28791259ab75SChris Mason ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, 28801259ab75SChris Mason parent_transid); 28811259ab75SChris Mason return !ret; 28825f39d397SChris Mason } 28836702ed49SChris Mason 28845f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 28855f39d397SChris Mason { 2886810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 2887d1310b2eSChris Mason return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, 28885f39d397SChris Mason buf); 28895f39d397SChris Mason } 28905f39d397SChris Mason 28915f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 28925f39d397SChris Mason { 2893810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 28945f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 28955f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 2896b9473439SChris Mason int was_dirty; 2897b4ce94deSChris Mason 2898b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 2899ccd467d6SChris Mason if (transid != root->fs_info->generation) { 2900d397712bSChris Mason printk(KERN_CRIT "btrfs transid mismatch buffer %llu, " 2901d397712bSChris Mason "found %llu running %llu\n", 2902db94535dSChris Mason (unsigned long long)buf->start, 2903d397712bSChris Mason (unsigned long long)transid, 2904d397712bSChris Mason (unsigned long long)root->fs_info->generation); 2905ccd467d6SChris Mason WARN_ON(1); 2906ccd467d6SChris Mason } 2907b9473439SChris Mason was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 2908b9473439SChris Mason buf); 2909b9473439SChris Mason if (!was_dirty) { 2910b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 2911b9473439SChris Mason root->fs_info->dirty_metadata_bytes += buf->len; 2912b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 2913b9473439SChris Mason } 2914eb60ceacSChris Mason } 2915eb60ceacSChris Mason 2916d3c2fdcfSChris Mason void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 291735b7e476SChris Mason { 2918188de649SChris Mason /* 2919188de649SChris Mason * looks as though older kernels can get into trouble with 2920188de649SChris Mason * this code, they end up stuck in balance_dirty_pages forever 2921188de649SChris Mason */ 2922d6bfde87SChris Mason u64 num_dirty; 2923771ed689SChris Mason unsigned long thresh = 32 * 1024 * 1024; 2924d6bfde87SChris Mason 29256933c02eSJens Axboe if (current->flags & PF_MEMALLOC) 2926d6bfde87SChris Mason return; 2927d6bfde87SChris Mason 292816cdcec7SMiao Xie btrfs_balance_delayed_items(root); 292916cdcec7SMiao Xie 293016cdcec7SMiao Xie num_dirty = root->fs_info->dirty_metadata_bytes; 293116cdcec7SMiao Xie 293216cdcec7SMiao Xie if (num_dirty > thresh) { 293316cdcec7SMiao Xie balance_dirty_pages_ratelimited_nr( 293416cdcec7SMiao Xie root->fs_info->btree_inode->i_mapping, 1); 293516cdcec7SMiao Xie } 293616cdcec7SMiao Xie return; 293716cdcec7SMiao Xie } 293816cdcec7SMiao Xie 293916cdcec7SMiao Xie void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 294016cdcec7SMiao Xie { 294116cdcec7SMiao Xie /* 294216cdcec7SMiao Xie * looks as though older kernels can get into trouble with 294316cdcec7SMiao Xie * this code, they end up stuck in balance_dirty_pages forever 294416cdcec7SMiao Xie */ 294516cdcec7SMiao Xie u64 num_dirty; 294616cdcec7SMiao Xie unsigned long thresh = 32 * 1024 * 1024; 294716cdcec7SMiao Xie 294816cdcec7SMiao Xie if (current->flags & PF_MEMALLOC) 294916cdcec7SMiao Xie return; 295016cdcec7SMiao Xie 2951585ad2c3SChris Mason num_dirty = root->fs_info->dirty_metadata_bytes; 2952585ad2c3SChris Mason 2953d6bfde87SChris Mason if (num_dirty > thresh) { 2954d3c2fdcfSChris Mason balance_dirty_pages_ratelimited_nr( 2955304fced6SChris Mason root->fs_info->btree_inode->i_mapping, 1); 295635b7e476SChris Mason } 2957188de649SChris Mason return; 2958d6bfde87SChris Mason } 29596b80053dSChris Mason 2960ca7a79adSChris Mason int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 29616b80053dSChris Mason { 2962810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 2963ce9adaa5SChris Mason int ret; 2964ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 2965d397712bSChris Mason if (ret == 0) 2966b4ce94deSChris Mason set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); 2967ce9adaa5SChris Mason return ret; 29686b80053dSChris Mason } 29690da5468fSChris Mason 297001d658f2SChris Mason static int btree_lock_page_hook(struct page *page, void *data, 297101d658f2SChris Mason void (*flush_fn)(void *)) 29724bef0848SChris Mason { 29734bef0848SChris Mason struct inode *inode = page->mapping->host; 2974b9473439SChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 29754bef0848SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 29764bef0848SChris Mason struct extent_buffer *eb; 29774bef0848SChris Mason unsigned long len; 29784bef0848SChris Mason u64 bytenr = page_offset(page); 29794bef0848SChris Mason 29804bef0848SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 29814bef0848SChris Mason goto out; 29824bef0848SChris Mason 29834bef0848SChris Mason len = page->private >> 2; 2984f09d1f60SDavid Sterba eb = find_extent_buffer(io_tree, bytenr, len); 29854bef0848SChris Mason if (!eb) 29864bef0848SChris Mason goto out; 29874bef0848SChris Mason 298801d658f2SChris Mason if (!btrfs_try_tree_write_lock(eb)) { 298901d658f2SChris Mason flush_fn(data); 29904bef0848SChris Mason btrfs_tree_lock(eb); 299101d658f2SChris Mason } 29924bef0848SChris Mason btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); 2993b9473439SChris Mason 2994b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { 2995b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 2996b9473439SChris Mason if (root->fs_info->dirty_metadata_bytes >= eb->len) 2997b9473439SChris Mason root->fs_info->dirty_metadata_bytes -= eb->len; 2998b9473439SChris Mason else 2999b9473439SChris Mason WARN_ON(1); 3000b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 3001b9473439SChris Mason } 3002b9473439SChris Mason 30034bef0848SChris Mason btrfs_tree_unlock(eb); 30044bef0848SChris Mason free_extent_buffer(eb); 30054bef0848SChris Mason out: 300601d658f2SChris Mason if (!trylock_page(page)) { 300701d658f2SChris Mason flush_fn(data); 30084bef0848SChris Mason lock_page(page); 300901d658f2SChris Mason } 30104bef0848SChris Mason return 0; 30114bef0848SChris Mason } 30124bef0848SChris Mason 3013acce952bSliubo static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info, 3014acce952bSliubo int read_only) 3015acce952bSliubo { 3016acce952bSliubo if (read_only) 3017acce952bSliubo return; 3018acce952bSliubo 3019acce952bSliubo if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) 3020acce952bSliubo printk(KERN_WARNING "warning: mount fs with errors, " 3021acce952bSliubo "running btrfsck is recommended\n"); 3022acce952bSliubo } 3023acce952bSliubo 3024acce952bSliubo int btrfs_error_commit_super(struct btrfs_root *root) 3025acce952bSliubo { 3026acce952bSliubo int ret; 3027acce952bSliubo 3028acce952bSliubo mutex_lock(&root->fs_info->cleaner_mutex); 3029acce952bSliubo btrfs_run_delayed_iputs(root); 3030acce952bSliubo mutex_unlock(&root->fs_info->cleaner_mutex); 3031acce952bSliubo 3032acce952bSliubo down_write(&root->fs_info->cleanup_work_sem); 3033acce952bSliubo up_write(&root->fs_info->cleanup_work_sem); 3034acce952bSliubo 3035acce952bSliubo /* cleanup FS via transaction */ 3036acce952bSliubo btrfs_cleanup_transaction(root); 3037acce952bSliubo 3038acce952bSliubo ret = write_ctree_super(NULL, root, 0); 3039acce952bSliubo 3040acce952bSliubo return ret; 3041acce952bSliubo } 3042acce952bSliubo 3043acce952bSliubo static int btrfs_destroy_ordered_operations(struct btrfs_root *root) 3044acce952bSliubo { 3045acce952bSliubo struct btrfs_inode *btrfs_inode; 3046acce952bSliubo struct list_head splice; 3047acce952bSliubo 3048acce952bSliubo INIT_LIST_HEAD(&splice); 3049acce952bSliubo 3050acce952bSliubo mutex_lock(&root->fs_info->ordered_operations_mutex); 3051acce952bSliubo spin_lock(&root->fs_info->ordered_extent_lock); 3052acce952bSliubo 3053acce952bSliubo list_splice_init(&root->fs_info->ordered_operations, &splice); 3054acce952bSliubo while (!list_empty(&splice)) { 3055acce952bSliubo btrfs_inode = list_entry(splice.next, struct btrfs_inode, 3056acce952bSliubo ordered_operations); 3057acce952bSliubo 3058acce952bSliubo list_del_init(&btrfs_inode->ordered_operations); 3059acce952bSliubo 3060acce952bSliubo btrfs_invalidate_inodes(btrfs_inode->root); 3061acce952bSliubo } 3062acce952bSliubo 3063acce952bSliubo spin_unlock(&root->fs_info->ordered_extent_lock); 3064acce952bSliubo mutex_unlock(&root->fs_info->ordered_operations_mutex); 3065acce952bSliubo 3066acce952bSliubo return 0; 3067acce952bSliubo } 3068acce952bSliubo 3069acce952bSliubo static int btrfs_destroy_ordered_extents(struct btrfs_root *root) 3070acce952bSliubo { 3071acce952bSliubo struct list_head splice; 3072acce952bSliubo struct btrfs_ordered_extent *ordered; 3073acce952bSliubo struct inode *inode; 3074acce952bSliubo 3075acce952bSliubo INIT_LIST_HEAD(&splice); 3076acce952bSliubo 3077acce952bSliubo spin_lock(&root->fs_info->ordered_extent_lock); 3078acce952bSliubo 3079acce952bSliubo list_splice_init(&root->fs_info->ordered_extents, &splice); 3080acce952bSliubo while (!list_empty(&splice)) { 3081acce952bSliubo ordered = list_entry(splice.next, struct btrfs_ordered_extent, 3082acce952bSliubo root_extent_list); 3083acce952bSliubo 3084acce952bSliubo list_del_init(&ordered->root_extent_list); 3085acce952bSliubo atomic_inc(&ordered->refs); 3086acce952bSliubo 3087acce952bSliubo /* the inode may be getting freed (in sys_unlink path). */ 3088acce952bSliubo inode = igrab(ordered->inode); 3089acce952bSliubo 3090acce952bSliubo spin_unlock(&root->fs_info->ordered_extent_lock); 3091acce952bSliubo if (inode) 3092acce952bSliubo iput(inode); 3093acce952bSliubo 3094acce952bSliubo atomic_set(&ordered->refs, 1); 3095acce952bSliubo btrfs_put_ordered_extent(ordered); 3096acce952bSliubo 3097acce952bSliubo spin_lock(&root->fs_info->ordered_extent_lock); 3098acce952bSliubo } 3099acce952bSliubo 3100acce952bSliubo spin_unlock(&root->fs_info->ordered_extent_lock); 3101acce952bSliubo 3102acce952bSliubo return 0; 3103acce952bSliubo } 3104acce952bSliubo 3105acce952bSliubo static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, 3106acce952bSliubo struct btrfs_root *root) 3107acce952bSliubo { 3108acce952bSliubo struct rb_node *node; 3109acce952bSliubo struct btrfs_delayed_ref_root *delayed_refs; 3110acce952bSliubo struct btrfs_delayed_ref_node *ref; 3111acce952bSliubo int ret = 0; 3112acce952bSliubo 3113acce952bSliubo delayed_refs = &trans->delayed_refs; 3114acce952bSliubo 3115acce952bSliubo spin_lock(&delayed_refs->lock); 3116acce952bSliubo if (delayed_refs->num_entries == 0) { 3117cfece4dbSDavid Sterba spin_unlock(&delayed_refs->lock); 3118acce952bSliubo printk(KERN_INFO "delayed_refs has NO entry\n"); 3119acce952bSliubo return ret; 3120acce952bSliubo } 3121acce952bSliubo 3122acce952bSliubo node = rb_first(&delayed_refs->root); 3123acce952bSliubo while (node) { 3124acce952bSliubo ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); 3125acce952bSliubo node = rb_next(node); 3126acce952bSliubo 3127acce952bSliubo ref->in_tree = 0; 3128acce952bSliubo rb_erase(&ref->rb_node, &delayed_refs->root); 3129acce952bSliubo delayed_refs->num_entries--; 3130acce952bSliubo 3131acce952bSliubo atomic_set(&ref->refs, 1); 3132acce952bSliubo if (btrfs_delayed_ref_is_head(ref)) { 3133acce952bSliubo struct btrfs_delayed_ref_head *head; 3134acce952bSliubo 3135acce952bSliubo head = btrfs_delayed_node_to_head(ref); 3136acce952bSliubo mutex_lock(&head->mutex); 3137acce952bSliubo kfree(head->extent_op); 3138acce952bSliubo delayed_refs->num_heads--; 3139acce952bSliubo if (list_empty(&head->cluster)) 3140acce952bSliubo delayed_refs->num_heads_ready--; 3141acce952bSliubo list_del_init(&head->cluster); 3142acce952bSliubo mutex_unlock(&head->mutex); 3143acce952bSliubo } 3144acce952bSliubo 3145acce952bSliubo spin_unlock(&delayed_refs->lock); 3146acce952bSliubo btrfs_put_delayed_ref(ref); 3147acce952bSliubo 3148acce952bSliubo cond_resched(); 3149acce952bSliubo spin_lock(&delayed_refs->lock); 3150acce952bSliubo } 3151acce952bSliubo 3152acce952bSliubo spin_unlock(&delayed_refs->lock); 3153acce952bSliubo 3154acce952bSliubo return ret; 3155acce952bSliubo } 3156acce952bSliubo 3157acce952bSliubo static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t) 3158acce952bSliubo { 3159acce952bSliubo struct btrfs_pending_snapshot *snapshot; 3160acce952bSliubo struct list_head splice; 3161acce952bSliubo 3162acce952bSliubo INIT_LIST_HEAD(&splice); 3163acce952bSliubo 3164acce952bSliubo list_splice_init(&t->pending_snapshots, &splice); 3165acce952bSliubo 3166acce952bSliubo while (!list_empty(&splice)) { 3167acce952bSliubo snapshot = list_entry(splice.next, 3168acce952bSliubo struct btrfs_pending_snapshot, 3169acce952bSliubo list); 3170acce952bSliubo 3171acce952bSliubo list_del_init(&snapshot->list); 3172acce952bSliubo 3173acce952bSliubo kfree(snapshot); 3174acce952bSliubo } 3175acce952bSliubo 3176acce952bSliubo return 0; 3177acce952bSliubo } 3178acce952bSliubo 3179acce952bSliubo static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root) 3180acce952bSliubo { 3181acce952bSliubo struct btrfs_inode *btrfs_inode; 3182acce952bSliubo struct list_head splice; 3183acce952bSliubo 3184acce952bSliubo INIT_LIST_HEAD(&splice); 3185acce952bSliubo 3186acce952bSliubo spin_lock(&root->fs_info->delalloc_lock); 31875be76758SDavid Sterba list_splice_init(&root->fs_info->delalloc_inodes, &splice); 3188acce952bSliubo 3189acce952bSliubo while (!list_empty(&splice)) { 3190acce952bSliubo btrfs_inode = list_entry(splice.next, struct btrfs_inode, 3191acce952bSliubo delalloc_inodes); 3192acce952bSliubo 3193acce952bSliubo list_del_init(&btrfs_inode->delalloc_inodes); 3194acce952bSliubo 3195acce952bSliubo btrfs_invalidate_inodes(btrfs_inode->root); 3196acce952bSliubo } 3197acce952bSliubo 3198acce952bSliubo spin_unlock(&root->fs_info->delalloc_lock); 3199acce952bSliubo 3200acce952bSliubo return 0; 3201acce952bSliubo } 3202acce952bSliubo 3203acce952bSliubo static int btrfs_destroy_marked_extents(struct btrfs_root *root, 3204acce952bSliubo struct extent_io_tree *dirty_pages, 3205acce952bSliubo int mark) 3206acce952bSliubo { 3207acce952bSliubo int ret; 3208acce952bSliubo struct page *page; 3209acce952bSliubo struct inode *btree_inode = root->fs_info->btree_inode; 3210acce952bSliubo struct extent_buffer *eb; 3211acce952bSliubo u64 start = 0; 3212acce952bSliubo u64 end; 3213acce952bSliubo u64 offset; 3214acce952bSliubo unsigned long index; 3215acce952bSliubo 3216acce952bSliubo while (1) { 3217acce952bSliubo ret = find_first_extent_bit(dirty_pages, start, &start, &end, 3218acce952bSliubo mark); 3219acce952bSliubo if (ret) 3220acce952bSliubo break; 3221acce952bSliubo 3222acce952bSliubo clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); 3223acce952bSliubo while (start <= end) { 3224acce952bSliubo index = start >> PAGE_CACHE_SHIFT; 3225acce952bSliubo start = (u64)(index + 1) << PAGE_CACHE_SHIFT; 3226acce952bSliubo page = find_get_page(btree_inode->i_mapping, index); 3227acce952bSliubo if (!page) 3228acce952bSliubo continue; 3229acce952bSliubo offset = page_offset(page); 3230acce952bSliubo 3231acce952bSliubo spin_lock(&dirty_pages->buffer_lock); 3232acce952bSliubo eb = radix_tree_lookup( 3233acce952bSliubo &(&BTRFS_I(page->mapping->host)->io_tree)->buffer, 3234acce952bSliubo offset >> PAGE_CACHE_SHIFT); 3235acce952bSliubo spin_unlock(&dirty_pages->buffer_lock); 3236acce952bSliubo if (eb) { 3237acce952bSliubo ret = test_and_clear_bit(EXTENT_BUFFER_DIRTY, 3238acce952bSliubo &eb->bflags); 3239acce952bSliubo atomic_set(&eb->refs, 1); 3240acce952bSliubo } 3241acce952bSliubo if (PageWriteback(page)) 3242acce952bSliubo end_page_writeback(page); 3243acce952bSliubo 3244acce952bSliubo lock_page(page); 3245acce952bSliubo if (PageDirty(page)) { 3246acce952bSliubo clear_page_dirty_for_io(page); 3247acce952bSliubo spin_lock_irq(&page->mapping->tree_lock); 3248acce952bSliubo radix_tree_tag_clear(&page->mapping->page_tree, 3249acce952bSliubo page_index(page), 3250acce952bSliubo PAGECACHE_TAG_DIRTY); 3251acce952bSliubo spin_unlock_irq(&page->mapping->tree_lock); 3252acce952bSliubo } 3253acce952bSliubo 3254acce952bSliubo page->mapping->a_ops->invalidatepage(page, 0); 3255acce952bSliubo unlock_page(page); 3256acce952bSliubo } 3257acce952bSliubo } 3258acce952bSliubo 3259acce952bSliubo return ret; 3260acce952bSliubo } 3261acce952bSliubo 3262acce952bSliubo static int btrfs_destroy_pinned_extent(struct btrfs_root *root, 3263acce952bSliubo struct extent_io_tree *pinned_extents) 3264acce952bSliubo { 3265acce952bSliubo struct extent_io_tree *unpin; 3266acce952bSliubo u64 start; 3267acce952bSliubo u64 end; 3268acce952bSliubo int ret; 3269acce952bSliubo 3270acce952bSliubo unpin = pinned_extents; 3271acce952bSliubo while (1) { 3272acce952bSliubo ret = find_first_extent_bit(unpin, 0, &start, &end, 3273acce952bSliubo EXTENT_DIRTY); 3274acce952bSliubo if (ret) 3275acce952bSliubo break; 3276acce952bSliubo 3277acce952bSliubo /* opt_discard */ 32785378e607SLi Dongyang if (btrfs_test_opt(root, DISCARD)) 32795378e607SLi Dongyang ret = btrfs_error_discard_extent(root, start, 32805378e607SLi Dongyang end + 1 - start, 32815378e607SLi Dongyang NULL); 3282acce952bSliubo 3283acce952bSliubo clear_extent_dirty(unpin, start, end, GFP_NOFS); 3284acce952bSliubo btrfs_error_unpin_extent_range(root, start, end); 3285acce952bSliubo cond_resched(); 3286acce952bSliubo } 3287acce952bSliubo 3288acce952bSliubo return 0; 3289acce952bSliubo } 3290acce952bSliubo 3291acce952bSliubo static int btrfs_cleanup_transaction(struct btrfs_root *root) 3292acce952bSliubo { 3293acce952bSliubo struct btrfs_transaction *t; 3294acce952bSliubo LIST_HEAD(list); 3295acce952bSliubo 3296acce952bSliubo WARN_ON(1); 3297acce952bSliubo 3298acce952bSliubo mutex_lock(&root->fs_info->transaction_kthread_mutex); 3299acce952bSliubo 3300a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 3301acce952bSliubo list_splice_init(&root->fs_info->trans_list, &list); 3302a4abeea4SJosef Bacik root->fs_info->trans_no_join = 1; 3303a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 3304a4abeea4SJosef Bacik 3305acce952bSliubo while (!list_empty(&list)) { 3306acce952bSliubo t = list_entry(list.next, struct btrfs_transaction, list); 3307acce952bSliubo if (!t) 3308acce952bSliubo break; 3309acce952bSliubo 3310acce952bSliubo btrfs_destroy_ordered_operations(root); 3311acce952bSliubo 3312acce952bSliubo btrfs_destroy_ordered_extents(root); 3313acce952bSliubo 3314acce952bSliubo btrfs_destroy_delayed_refs(t, root); 3315acce952bSliubo 3316acce952bSliubo btrfs_block_rsv_release(root, 3317acce952bSliubo &root->fs_info->trans_block_rsv, 3318acce952bSliubo t->dirty_pages.dirty_bytes); 3319acce952bSliubo 3320acce952bSliubo /* FIXME: cleanup wait for commit */ 3321acce952bSliubo t->in_commit = 1; 3322acce952bSliubo t->blocked = 1; 3323acce952bSliubo if (waitqueue_active(&root->fs_info->transaction_blocked_wait)) 3324acce952bSliubo wake_up(&root->fs_info->transaction_blocked_wait); 3325acce952bSliubo 3326acce952bSliubo t->blocked = 0; 3327acce952bSliubo if (waitqueue_active(&root->fs_info->transaction_wait)) 3328acce952bSliubo wake_up(&root->fs_info->transaction_wait); 3329acce952bSliubo 3330acce952bSliubo t->commit_done = 1; 3331acce952bSliubo if (waitqueue_active(&t->commit_wait)) 3332acce952bSliubo wake_up(&t->commit_wait); 3333acce952bSliubo 3334acce952bSliubo btrfs_destroy_pending_snapshots(t); 3335acce952bSliubo 3336acce952bSliubo btrfs_destroy_delalloc_inodes(root); 3337acce952bSliubo 3338a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 3339acce952bSliubo root->fs_info->running_transaction = NULL; 3340a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 3341acce952bSliubo 3342acce952bSliubo btrfs_destroy_marked_extents(root, &t->dirty_pages, 3343acce952bSliubo EXTENT_DIRTY); 3344acce952bSliubo 3345acce952bSliubo btrfs_destroy_pinned_extent(root, 3346acce952bSliubo root->fs_info->pinned_extents); 3347acce952bSliubo 334813c5a93eSJosef Bacik atomic_set(&t->use_count, 0); 3349acce952bSliubo list_del_init(&t->list); 3350acce952bSliubo memset(t, 0, sizeof(*t)); 3351acce952bSliubo kmem_cache_free(btrfs_transaction_cachep, t); 3352acce952bSliubo } 3353acce952bSliubo 3354a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 3355a4abeea4SJosef Bacik root->fs_info->trans_no_join = 0; 3356a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 3357acce952bSliubo mutex_unlock(&root->fs_info->transaction_kthread_mutex); 3358acce952bSliubo 3359acce952bSliubo return 0; 3360acce952bSliubo } 3361acce952bSliubo 3362d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops = { 33634bef0848SChris Mason .write_cache_pages_lock_hook = btree_lock_page_hook, 3364ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 33650b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 3366239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 3367239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 33680da5468fSChris Mason }; 3369