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> 295a0e3ad6STejun Heo #include <linux/slab.h> 30784b4e29SChris Mason #include <linux/migrate.h> 317a36ddecSDavid Sterba #include <linux/ratelimit.h> 326463fe58SStefan Behrens #include <linux/uuid.h> 33803b2f54SStefan Behrens #include <linux/semaphore.h> 347e75bf3fSDavid Sterba #include <asm/unaligned.h> 35eb60ceacSChris Mason #include "ctree.h" 36eb60ceacSChris Mason #include "disk-io.h" 370b947affSFilipe David Borba Manana #include "hash.h" 38e089f05cSChris Mason #include "transaction.h" 390f7d52f4SChris Mason #include "btrfs_inode.h" 400b86a832SChris Mason #include "volumes.h" 41db94535dSChris Mason #include "print-tree.h" 42925baeddSChris Mason #include "locking.h" 43e02119d5SChris Mason #include "tree-log.h" 44fa9c0d79SChris Mason #include "free-space-cache.h" 4570f6d82eSOmar Sandoval #include "free-space-tree.h" 46581bb050SLi Zefan #include "inode-map.h" 4721adbd5cSStefan Behrens #include "check-integrity.h" 48606686eeSJosef Bacik #include "rcu-string.h" 498dabb742SStefan Behrens #include "dev-replace.h" 5053b381b3SDavid Woodhouse #include "raid56.h" 515ac1d209SJeff Mahoney #include "sysfs.h" 52fcebe456SJosef Bacik #include "qgroup.h" 53eb60ceacSChris Mason 54de0022b9SJosef Bacik #ifdef CONFIG_X86 55de0022b9SJosef Bacik #include <asm/cpufeature.h> 56de0022b9SJosef Bacik #endif 57de0022b9SJosef Bacik 58e8c9f186SDavid Sterba static const struct extent_io_ops btree_extent_io_ops; 598b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work); 604df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root); 61fcd1f065SDavid Sterba static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, 62acce952bSliubo int read_only); 63143bede5SJeff Mahoney static void btrfs_destroy_ordered_extents(struct btrfs_root *root); 64acce952bSliubo static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, 65acce952bSliubo struct btrfs_root *root); 66143bede5SJeff Mahoney static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root); 67acce952bSliubo static int btrfs_destroy_marked_extents(struct btrfs_root *root, 68acce952bSliubo struct extent_io_tree *dirty_pages, 69acce952bSliubo int mark); 70acce952bSliubo static int btrfs_destroy_pinned_extent(struct btrfs_root *root, 71acce952bSliubo struct extent_io_tree *pinned_extents); 7248a3b636SEric Sandeen static int btrfs_cleanup_transaction(struct btrfs_root *root); 7348a3b636SEric Sandeen static void btrfs_error_commit_super(struct btrfs_root *root); 74ce9adaa5SChris Mason 75d352ac68SChris Mason /* 7697eb6b69SDavid Sterba * btrfs_end_io_wq structs are used to do processing in task context when an IO 7797eb6b69SDavid Sterba * is complete. This is used during reads to verify checksums, and it is used 78d352ac68SChris Mason * by writes to insert metadata for new file extents after IO is complete. 79d352ac68SChris Mason */ 8097eb6b69SDavid Sterba struct btrfs_end_io_wq { 81ce9adaa5SChris Mason struct bio *bio; 82ce9adaa5SChris Mason bio_end_io_t *end_io; 83ce9adaa5SChris Mason void *private; 84ce9adaa5SChris Mason struct btrfs_fs_info *info; 85ce9adaa5SChris Mason int error; 86bfebd8b5SDavid Sterba enum btrfs_wq_endio_type metadata; 87ce9adaa5SChris Mason struct list_head list; 888b712842SChris Mason struct btrfs_work work; 89ce9adaa5SChris Mason }; 900da5468fSChris Mason 9197eb6b69SDavid Sterba static struct kmem_cache *btrfs_end_io_wq_cache; 9297eb6b69SDavid Sterba 9397eb6b69SDavid Sterba int __init btrfs_end_io_wq_init(void) 9497eb6b69SDavid Sterba { 9597eb6b69SDavid Sterba btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq", 9697eb6b69SDavid Sterba sizeof(struct btrfs_end_io_wq), 9797eb6b69SDavid Sterba 0, 9897eb6b69SDavid Sterba SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, 9997eb6b69SDavid Sterba NULL); 10097eb6b69SDavid Sterba if (!btrfs_end_io_wq_cache) 10197eb6b69SDavid Sterba return -ENOMEM; 10297eb6b69SDavid Sterba return 0; 10397eb6b69SDavid Sterba } 10497eb6b69SDavid Sterba 10597eb6b69SDavid Sterba void btrfs_end_io_wq_exit(void) 10697eb6b69SDavid Sterba { 10797eb6b69SDavid Sterba if (btrfs_end_io_wq_cache) 10897eb6b69SDavid Sterba kmem_cache_destroy(btrfs_end_io_wq_cache); 10997eb6b69SDavid Sterba } 11097eb6b69SDavid Sterba 111d352ac68SChris Mason /* 112d352ac68SChris Mason * async submit bios are used to offload expensive checksumming 113d352ac68SChris Mason * onto the worker threads. They checksum file and metadata bios 114d352ac68SChris Mason * just before they are sent down the IO stack. 115d352ac68SChris Mason */ 11644b8bd7eSChris Mason struct async_submit_bio { 11744b8bd7eSChris Mason struct inode *inode; 11844b8bd7eSChris Mason struct bio *bio; 11944b8bd7eSChris Mason struct list_head list; 1204a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start; 1214a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done; 12244b8bd7eSChris Mason int rw; 12344b8bd7eSChris Mason int mirror_num; 124c8b97818SChris Mason unsigned long bio_flags; 125eaf25d93SChris Mason /* 126eaf25d93SChris Mason * bio_offset is optional, can be used if the pages in the bio 127eaf25d93SChris Mason * can't tell us where in the file the bio should go 128eaf25d93SChris Mason */ 129eaf25d93SChris Mason u64 bio_offset; 1308b712842SChris Mason struct btrfs_work work; 13179787eaaSJeff Mahoney int error; 13244b8bd7eSChris Mason }; 13344b8bd7eSChris Mason 13485d4e461SChris Mason /* 13585d4e461SChris Mason * Lockdep class keys for extent_buffer->lock's in this root. For a given 13685d4e461SChris Mason * eb, the lockdep key is determined by the btrfs_root it belongs to and 13785d4e461SChris Mason * the level the eb occupies in the tree. 1384008c04aSChris Mason * 13985d4e461SChris Mason * Different roots are used for different purposes and may nest inside each 14085d4e461SChris Mason * other and they require separate keysets. As lockdep keys should be 14185d4e461SChris Mason * static, assign keysets according to the purpose of the root as indicated 14285d4e461SChris Mason * by btrfs_root->objectid. This ensures that all special purpose roots 14385d4e461SChris Mason * have separate keysets. 1444008c04aSChris Mason * 14585d4e461SChris Mason * Lock-nesting across peer nodes is always done with the immediate parent 14685d4e461SChris Mason * node locked thus preventing deadlock. As lockdep doesn't know this, use 14785d4e461SChris Mason * subclass to avoid triggering lockdep warning in such cases. 1484008c04aSChris Mason * 14985d4e461SChris Mason * The key is set by the readpage_end_io_hook after the buffer has passed 15085d4e461SChris Mason * csum validation but before the pages are unlocked. It is also set by 15185d4e461SChris Mason * btrfs_init_new_buffer on freshly allocated blocks. 15285d4e461SChris Mason * 15385d4e461SChris Mason * We also add a check to make sure the highest level of the tree is the 15485d4e461SChris Mason * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code 15585d4e461SChris Mason * needs update as well. 1564008c04aSChris Mason */ 1574008c04aSChris Mason #ifdef CONFIG_DEBUG_LOCK_ALLOC 1584008c04aSChris Mason # if BTRFS_MAX_LEVEL != 8 1594008c04aSChris Mason # error 1604008c04aSChris Mason # endif 16185d4e461SChris Mason 16285d4e461SChris Mason static struct btrfs_lockdep_keyset { 16385d4e461SChris Mason u64 id; /* root objectid */ 16485d4e461SChris Mason const char *name_stem; /* lock name stem */ 16585d4e461SChris Mason char names[BTRFS_MAX_LEVEL + 1][20]; 16685d4e461SChris Mason struct lock_class_key keys[BTRFS_MAX_LEVEL + 1]; 16785d4e461SChris Mason } btrfs_lockdep_keysets[] = { 16885d4e461SChris Mason { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" }, 16985d4e461SChris Mason { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" }, 17085d4e461SChris Mason { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" }, 17185d4e461SChris Mason { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" }, 17285d4e461SChris Mason { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" }, 17385d4e461SChris Mason { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" }, 17460b62978SDavid Sterba { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" }, 17585d4e461SChris Mason { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" }, 17685d4e461SChris Mason { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" }, 17785d4e461SChris Mason { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" }, 17813fd8da9SDavid Sterba { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" }, 17985d4e461SChris Mason { .id = 0, .name_stem = "tree" }, 1804008c04aSChris Mason }; 18185d4e461SChris Mason 18285d4e461SChris Mason void __init btrfs_init_lockdep(void) 18385d4e461SChris Mason { 18485d4e461SChris Mason int i, j; 18585d4e461SChris Mason 18685d4e461SChris Mason /* initialize lockdep class names */ 18785d4e461SChris Mason for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) { 18885d4e461SChris Mason struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i]; 18985d4e461SChris Mason 19085d4e461SChris Mason for (j = 0; j < ARRAY_SIZE(ks->names); j++) 19185d4e461SChris Mason snprintf(ks->names[j], sizeof(ks->names[j]), 19285d4e461SChris Mason "btrfs-%s-%02d", ks->name_stem, j); 19385d4e461SChris Mason } 19485d4e461SChris Mason } 19585d4e461SChris Mason 19685d4e461SChris Mason void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, 19785d4e461SChris Mason int level) 19885d4e461SChris Mason { 19985d4e461SChris Mason struct btrfs_lockdep_keyset *ks; 20085d4e461SChris Mason 20185d4e461SChris Mason BUG_ON(level >= ARRAY_SIZE(ks->keys)); 20285d4e461SChris Mason 20385d4e461SChris Mason /* find the matching keyset, id 0 is the default entry */ 20485d4e461SChris Mason for (ks = btrfs_lockdep_keysets; ks->id; ks++) 20585d4e461SChris Mason if (ks->id == objectid) 20685d4e461SChris Mason break; 20785d4e461SChris Mason 20885d4e461SChris Mason lockdep_set_class_and_name(&eb->lock, 20985d4e461SChris Mason &ks->keys[level], ks->names[level]); 21085d4e461SChris Mason } 21185d4e461SChris Mason 2124008c04aSChris Mason #endif 2134008c04aSChris Mason 214d352ac68SChris Mason /* 215d352ac68SChris Mason * extents on the btree inode are pretty simple, there's one extent 216d352ac68SChris Mason * that covers the entire device 217d352ac68SChris Mason */ 218b2950863SChristoph Hellwig static struct extent_map *btree_get_extent(struct inode *inode, 219306e16ceSDavid Sterba struct page *page, size_t pg_offset, u64 start, u64 len, 2205f39d397SChris Mason int create) 2215f39d397SChris Mason { 2225f39d397SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 2235f39d397SChris Mason struct extent_map *em; 2245f39d397SChris Mason int ret; 2255f39d397SChris Mason 226890871beSChris Mason read_lock(&em_tree->lock); 227d1310b2eSChris Mason em = lookup_extent_mapping(em_tree, start, len); 228a061fc8dSChris Mason if (em) { 229a061fc8dSChris Mason em->bdev = 230a061fc8dSChris Mason BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 231890871beSChris Mason read_unlock(&em_tree->lock); 2325f39d397SChris Mason goto out; 233a061fc8dSChris Mason } 234890871beSChris Mason read_unlock(&em_tree->lock); 2357b13b7b1SChris Mason 236172ddd60SDavid Sterba em = alloc_extent_map(); 2375f39d397SChris Mason if (!em) { 2385f39d397SChris Mason em = ERR_PTR(-ENOMEM); 2395f39d397SChris Mason goto out; 2405f39d397SChris Mason } 2415f39d397SChris Mason em->start = 0; 2420afbaf8cSChris Mason em->len = (u64)-1; 243c8b97818SChris Mason em->block_len = (u64)-1; 2445f39d397SChris Mason em->block_start = 0; 245a061fc8dSChris Mason em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 246d1310b2eSChris Mason 247890871beSChris Mason write_lock(&em_tree->lock); 24809a2a8f9SJosef Bacik ret = add_extent_mapping(em_tree, em, 0); 2495f39d397SChris Mason if (ret == -EEXIST) { 2505f39d397SChris Mason free_extent_map(em); 2517b13b7b1SChris Mason em = lookup_extent_mapping(em_tree, start, len); 252b4f359abSTsutomu Itoh if (!em) 2530433f20dSTsutomu Itoh em = ERR_PTR(-EIO); 2545f39d397SChris Mason } else if (ret) { 2557b13b7b1SChris Mason free_extent_map(em); 2560433f20dSTsutomu Itoh em = ERR_PTR(ret); 2575f39d397SChris Mason } 258890871beSChris Mason write_unlock(&em_tree->lock); 2597b13b7b1SChris Mason 2605f39d397SChris Mason out: 2615f39d397SChris Mason return em; 2625f39d397SChris Mason } 2635f39d397SChris Mason 264b0496686SLiu Bo u32 btrfs_csum_data(char *data, u32 seed, size_t len) 26519c00ddcSChris Mason { 2660b947affSFilipe David Borba Manana return btrfs_crc32c(seed, data, len); 26719c00ddcSChris Mason } 26819c00ddcSChris Mason 26919c00ddcSChris Mason void btrfs_csum_final(u32 crc, char *result) 27019c00ddcSChris Mason { 2717e75bf3fSDavid Sterba put_unaligned_le32(~crc, result); 27219c00ddcSChris Mason } 27319c00ddcSChris Mason 274d352ac68SChris Mason /* 275d352ac68SChris Mason * compute the csum for a btree block, and either verify it or write it 276d352ac68SChris Mason * into the csum field of the block. 277d352ac68SChris Mason */ 27801d58472SDaniel Dressler static int csum_tree_block(struct btrfs_fs_info *fs_info, 27901d58472SDaniel Dressler struct extent_buffer *buf, 28019c00ddcSChris Mason int verify) 28119c00ddcSChris Mason { 28201d58472SDaniel Dressler u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); 283607d432dSJosef Bacik char *result = NULL; 28419c00ddcSChris Mason unsigned long len; 28519c00ddcSChris Mason unsigned long cur_len; 28619c00ddcSChris Mason unsigned long offset = BTRFS_CSUM_SIZE; 28719c00ddcSChris Mason char *kaddr; 28819c00ddcSChris Mason unsigned long map_start; 28919c00ddcSChris Mason unsigned long map_len; 29019c00ddcSChris Mason int err; 29119c00ddcSChris Mason u32 crc = ~(u32)0; 292607d432dSJosef Bacik unsigned long inline_result; 29319c00ddcSChris Mason 29419c00ddcSChris Mason len = buf->len - offset; 29519c00ddcSChris Mason while (len > 0) { 29619c00ddcSChris Mason err = map_private_extent_buffer(buf, offset, 32, 297a6591715SChris Mason &kaddr, &map_start, &map_len); 298d397712bSChris Mason if (err) 29919c00ddcSChris Mason return 1; 30019c00ddcSChris Mason cur_len = min(len, map_len - (offset - map_start)); 301b0496686SLiu Bo crc = btrfs_csum_data(kaddr + offset - map_start, 30219c00ddcSChris Mason crc, cur_len); 30319c00ddcSChris Mason len -= cur_len; 30419c00ddcSChris Mason offset += cur_len; 30519c00ddcSChris Mason } 306607d432dSJosef Bacik if (csum_size > sizeof(inline_result)) { 30731e818feSDavid Sterba result = kzalloc(csum_size, GFP_NOFS); 308607d432dSJosef Bacik if (!result) 309607d432dSJosef Bacik return 1; 310607d432dSJosef Bacik } else { 311607d432dSJosef Bacik result = (char *)&inline_result; 312607d432dSJosef Bacik } 313607d432dSJosef Bacik 31419c00ddcSChris Mason btrfs_csum_final(crc, result); 31519c00ddcSChris Mason 31619c00ddcSChris Mason if (verify) { 317607d432dSJosef Bacik if (memcmp_extent_buffer(buf, result, 0, csum_size)) { 318e4204dedSChris Mason u32 val; 319e4204dedSChris Mason u32 found = 0; 320607d432dSJosef Bacik memcpy(&found, result, csum_size); 321e4204dedSChris Mason 322607d432dSJosef Bacik read_extent_buffer(buf, &val, 0, csum_size); 323f0954c66SDavid Sterba printk_ratelimited(KERN_WARNING 324efe120a0SFrank Holton "BTRFS: %s checksum verify failed on %llu wanted %X found %X " 325193f284dSChris Mason "level %d\n", 32601d58472SDaniel Dressler fs_info->sb->s_id, buf->start, 327c1c9ff7cSGeert Uytterhoeven val, found, btrfs_header_level(buf)); 328607d432dSJosef Bacik if (result != (char *)&inline_result) 329607d432dSJosef Bacik kfree(result); 33019c00ddcSChris Mason return 1; 33119c00ddcSChris Mason } 33219c00ddcSChris Mason } else { 333607d432dSJosef Bacik write_extent_buffer(buf, result, 0, csum_size); 33419c00ddcSChris Mason } 335607d432dSJosef Bacik if (result != (char *)&inline_result) 336607d432dSJosef Bacik kfree(result); 33719c00ddcSChris Mason return 0; 33819c00ddcSChris Mason } 33919c00ddcSChris Mason 340d352ac68SChris Mason /* 341d352ac68SChris Mason * we can't consider a given block up to date unless the transid of the 342d352ac68SChris Mason * block matches the transid in the parent node's pointer. This is how we 343d352ac68SChris Mason * detect blocks that either didn't get written at all or got written 344d352ac68SChris Mason * in the wrong place. 345d352ac68SChris Mason */ 3461259ab75SChris Mason static int verify_parent_transid(struct extent_io_tree *io_tree, 347b9fab919SChris Mason struct extent_buffer *eb, u64 parent_transid, 348b9fab919SChris Mason int atomic) 3491259ab75SChris Mason { 3502ac55d41SJosef Bacik struct extent_state *cached_state = NULL; 3511259ab75SChris Mason int ret; 3522755a0deSDavid Sterba bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB); 3531259ab75SChris Mason 3541259ab75SChris Mason if (!parent_transid || btrfs_header_generation(eb) == parent_transid) 3551259ab75SChris Mason return 0; 3561259ab75SChris Mason 357b9fab919SChris Mason if (atomic) 358b9fab919SChris Mason return -EAGAIN; 359b9fab919SChris Mason 360a26e8c9fSJosef Bacik if (need_lock) { 361a26e8c9fSJosef Bacik btrfs_tree_read_lock(eb); 362a26e8c9fSJosef Bacik btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); 363a26e8c9fSJosef Bacik } 364a26e8c9fSJosef Bacik 3652ac55d41SJosef Bacik lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, 366d0082371SJeff Mahoney 0, &cached_state); 3670b32f4bbSJosef Bacik if (extent_buffer_uptodate(eb) && 3681259ab75SChris Mason btrfs_header_generation(eb) == parent_transid) { 3691259ab75SChris Mason ret = 0; 3701259ab75SChris Mason goto out; 3711259ab75SChris Mason } 37268b663d1SDavid Sterba printk_ratelimited(KERN_ERR 37368b663d1SDavid Sterba "BTRFS (device %s): parent transid verify failed on %llu wanted %llu found %llu\n", 37429549aecSWang Shilong eb->fs_info->sb->s_id, eb->start, 37529549aecSWang Shilong parent_transid, btrfs_header_generation(eb)); 3761259ab75SChris Mason ret = 1; 377a26e8c9fSJosef Bacik 378a26e8c9fSJosef Bacik /* 379a26e8c9fSJosef Bacik * Things reading via commit roots that don't have normal protection, 380a26e8c9fSJosef Bacik * like send, can have a really old block in cache that may point at a 381a26e8c9fSJosef Bacik * block that has been free'd and re-allocated. So don't clear uptodate 382a26e8c9fSJosef Bacik * if we find an eb that is under IO (dirty/writeback) because we could 383a26e8c9fSJosef Bacik * end up reading in the stale data and then writing it back out and 384a26e8c9fSJosef Bacik * making everybody very sad. 385a26e8c9fSJosef Bacik */ 386a26e8c9fSJosef Bacik if (!extent_buffer_under_io(eb)) 3870b32f4bbSJosef Bacik clear_extent_buffer_uptodate(eb); 38833958dc6SChris Mason out: 3892ac55d41SJosef Bacik unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, 3902ac55d41SJosef Bacik &cached_state, GFP_NOFS); 391472b909fSJosef Bacik if (need_lock) 392a26e8c9fSJosef Bacik btrfs_tree_read_unlock_blocking(eb); 3931259ab75SChris Mason return ret; 3941259ab75SChris Mason } 3951259ab75SChris Mason 396d352ac68SChris Mason /* 3971104a885SDavid Sterba * Return 0 if the superblock checksum type matches the checksum value of that 3981104a885SDavid Sterba * algorithm. Pass the raw disk superblock data. 3991104a885SDavid Sterba */ 4001104a885SDavid Sterba static int btrfs_check_super_csum(char *raw_disk_sb) 4011104a885SDavid Sterba { 4021104a885SDavid Sterba struct btrfs_super_block *disk_sb = 4031104a885SDavid Sterba (struct btrfs_super_block *)raw_disk_sb; 4041104a885SDavid Sterba u16 csum_type = btrfs_super_csum_type(disk_sb); 4051104a885SDavid Sterba int ret = 0; 4061104a885SDavid Sterba 4071104a885SDavid Sterba if (csum_type == BTRFS_CSUM_TYPE_CRC32) { 4081104a885SDavid Sterba u32 crc = ~(u32)0; 4091104a885SDavid Sterba const int csum_size = sizeof(crc); 4101104a885SDavid Sterba char result[csum_size]; 4111104a885SDavid Sterba 4121104a885SDavid Sterba /* 4131104a885SDavid Sterba * The super_block structure does not span the whole 4141104a885SDavid Sterba * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space 4151104a885SDavid Sterba * is filled with zeros and is included in the checkum. 4161104a885SDavid Sterba */ 4171104a885SDavid Sterba crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE, 4181104a885SDavid Sterba crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE); 4191104a885SDavid Sterba btrfs_csum_final(crc, result); 4201104a885SDavid Sterba 4211104a885SDavid Sterba if (memcmp(raw_disk_sb, result, csum_size)) 4221104a885SDavid Sterba ret = 1; 4231104a885SDavid Sterba } 4241104a885SDavid Sterba 4251104a885SDavid Sterba if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) { 426efe120a0SFrank Holton printk(KERN_ERR "BTRFS: unsupported checksum algorithm %u\n", 4271104a885SDavid Sterba csum_type); 4281104a885SDavid Sterba ret = 1; 4291104a885SDavid Sterba } 4301104a885SDavid Sterba 4311104a885SDavid Sterba return ret; 4321104a885SDavid Sterba } 4331104a885SDavid Sterba 4341104a885SDavid Sterba /* 435d352ac68SChris Mason * helper to read a given tree block, doing retries as required when 436d352ac68SChris Mason * the checksums don't match and we have alternate mirrors to try. 437d352ac68SChris Mason */ 438f188591eSChris Mason static int btree_read_extent_buffer_pages(struct btrfs_root *root, 439f188591eSChris Mason struct extent_buffer *eb, 440ca7a79adSChris Mason u64 start, u64 parent_transid) 441f188591eSChris Mason { 442f188591eSChris Mason struct extent_io_tree *io_tree; 443ea466794SJosef Bacik int failed = 0; 444f188591eSChris Mason int ret; 445f188591eSChris Mason int num_copies = 0; 446f188591eSChris Mason int mirror_num = 0; 447ea466794SJosef Bacik int failed_mirror = 0; 448f188591eSChris Mason 449a826d6dcSJosef Bacik clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); 450f188591eSChris Mason io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 451f188591eSChris Mason while (1) { 452bb82ab88SArne Jansen ret = read_extent_buffer_pages(io_tree, eb, start, 453bb82ab88SArne Jansen WAIT_COMPLETE, 454f188591eSChris Mason btree_get_extent, mirror_num); 455256dd1bbSStefan Behrens if (!ret) { 456256dd1bbSStefan Behrens if (!verify_parent_transid(io_tree, eb, 457b9fab919SChris Mason parent_transid, 0)) 458ea466794SJosef Bacik break; 459256dd1bbSStefan Behrens else 460256dd1bbSStefan Behrens ret = -EIO; 461256dd1bbSStefan Behrens } 462d397712bSChris Mason 463a826d6dcSJosef Bacik /* 464a826d6dcSJosef Bacik * This buffer's crc is fine, but its contents are corrupted, so 465a826d6dcSJosef Bacik * there is no reason to read the other copies, they won't be 466a826d6dcSJosef Bacik * any less wrong. 467a826d6dcSJosef Bacik */ 468a826d6dcSJosef Bacik if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags)) 469ea466794SJosef Bacik break; 470ea466794SJosef Bacik 4715d964051SStefan Behrens num_copies = btrfs_num_copies(root->fs_info, 472f188591eSChris Mason eb->start, eb->len); 4734235298eSChris Mason if (num_copies == 1) 474ea466794SJosef Bacik break; 4754235298eSChris Mason 4765cf1ab56SJosef Bacik if (!failed_mirror) { 4775cf1ab56SJosef Bacik failed = 1; 4785cf1ab56SJosef Bacik failed_mirror = eb->read_mirror; 4795cf1ab56SJosef Bacik } 4805cf1ab56SJosef Bacik 481f188591eSChris Mason mirror_num++; 482ea466794SJosef Bacik if (mirror_num == failed_mirror) 483ea466794SJosef Bacik mirror_num++; 484ea466794SJosef Bacik 4854235298eSChris Mason if (mirror_num > num_copies) 486ea466794SJosef Bacik break; 487f188591eSChris Mason } 488ea466794SJosef Bacik 489c0901581SStefan Behrens if (failed && !ret && failed_mirror) 490ea466794SJosef Bacik repair_eb_io_failure(root, eb, failed_mirror); 491ea466794SJosef Bacik 492ea466794SJosef Bacik return ret; 493f188591eSChris Mason } 49419c00ddcSChris Mason 495d352ac68SChris Mason /* 496d397712bSChris Mason * checksum a dirty tree block before IO. This has extra checks to make sure 497d397712bSChris Mason * we only fill in the checksum field in the first page of a multi-page block 498d352ac68SChris Mason */ 499d397712bSChris Mason 50001d58472SDaniel Dressler static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page) 50119c00ddcSChris Mason { 5024eee4fa4SMiao Xie u64 start = page_offset(page); 50319c00ddcSChris Mason u64 found_start; 50419c00ddcSChris Mason struct extent_buffer *eb; 505f188591eSChris Mason 5064f2de97aSJosef Bacik eb = (struct extent_buffer *)page->private; 5074f2de97aSJosef Bacik if (page != eb->pages[0]) 5084f2de97aSJosef Bacik return 0; 50919c00ddcSChris Mason found_start = btrfs_header_bytenr(eb); 510fae7f21cSDulshani Gunawardhana if (WARN_ON(found_start != start || !PageUptodate(page))) 5114f2de97aSJosef Bacik return 0; 51201d58472SDaniel Dressler csum_tree_block(fs_info, eb, 0); 51319c00ddcSChris Mason return 0; 51419c00ddcSChris Mason } 51519c00ddcSChris Mason 51601d58472SDaniel Dressler static int check_tree_block_fsid(struct btrfs_fs_info *fs_info, 5172b82032cSYan Zheng struct extent_buffer *eb) 5182b82032cSYan Zheng { 51901d58472SDaniel Dressler struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 5202b82032cSYan Zheng u8 fsid[BTRFS_UUID_SIZE]; 5212b82032cSYan Zheng int ret = 1; 5222b82032cSYan Zheng 5230a4e5586SRoss Kirk read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE); 5242b82032cSYan Zheng while (fs_devices) { 5252b82032cSYan Zheng if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { 5262b82032cSYan Zheng ret = 0; 5272b82032cSYan Zheng break; 5282b82032cSYan Zheng } 5292b82032cSYan Zheng fs_devices = fs_devices->seed; 5302b82032cSYan Zheng } 5312b82032cSYan Zheng return ret; 5322b82032cSYan Zheng } 5332b82032cSYan Zheng 534a826d6dcSJosef Bacik #define CORRUPT(reason, eb, root, slot) \ 535efe120a0SFrank Holton btrfs_crit(root->fs_info, "corrupt leaf, %s: block=%llu," \ 536efe120a0SFrank Holton "root=%llu, slot=%d", reason, \ 537c1c9ff7cSGeert Uytterhoeven btrfs_header_bytenr(eb), root->objectid, slot) 538a826d6dcSJosef Bacik 539a826d6dcSJosef Bacik static noinline int check_leaf(struct btrfs_root *root, 540a826d6dcSJosef Bacik struct extent_buffer *leaf) 541a826d6dcSJosef Bacik { 542a826d6dcSJosef Bacik struct btrfs_key key; 543a826d6dcSJosef Bacik struct btrfs_key leaf_key; 544a826d6dcSJosef Bacik u32 nritems = btrfs_header_nritems(leaf); 545a826d6dcSJosef Bacik int slot; 546a826d6dcSJosef Bacik 547a826d6dcSJosef Bacik if (nritems == 0) 548a826d6dcSJosef Bacik return 0; 549a826d6dcSJosef Bacik 550a826d6dcSJosef Bacik /* Check the 0 item */ 551a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) != 552a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 553a826d6dcSJosef Bacik CORRUPT("invalid item offset size pair", leaf, root, 0); 554a826d6dcSJosef Bacik return -EIO; 555a826d6dcSJosef Bacik } 556a826d6dcSJosef Bacik 557a826d6dcSJosef Bacik /* 558a826d6dcSJosef Bacik * Check to make sure each items keys are in the correct order and their 559a826d6dcSJosef Bacik * offsets make sense. We only have to loop through nritems-1 because 560a826d6dcSJosef Bacik * we check the current slot against the next slot, which verifies the 561a826d6dcSJosef Bacik * next slot's offset+size makes sense and that the current's slot 562a826d6dcSJosef Bacik * offset is correct. 563a826d6dcSJosef Bacik */ 564a826d6dcSJosef Bacik for (slot = 0; slot < nritems - 1; slot++) { 565a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &leaf_key, slot); 566a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &key, slot + 1); 567a826d6dcSJosef Bacik 568a826d6dcSJosef Bacik /* Make sure the keys are in the right order */ 569a826d6dcSJosef Bacik if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) { 570a826d6dcSJosef Bacik CORRUPT("bad key order", leaf, root, slot); 571a826d6dcSJosef Bacik return -EIO; 572a826d6dcSJosef Bacik } 573a826d6dcSJosef Bacik 574a826d6dcSJosef Bacik /* 575a826d6dcSJosef Bacik * Make sure the offset and ends are right, remember that the 576a826d6dcSJosef Bacik * item data starts at the end of the leaf and grows towards the 577a826d6dcSJosef Bacik * front. 578a826d6dcSJosef Bacik */ 579a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, slot) != 580a826d6dcSJosef Bacik btrfs_item_end_nr(leaf, slot + 1)) { 581a826d6dcSJosef Bacik CORRUPT("slot offset bad", leaf, root, slot); 582a826d6dcSJosef Bacik return -EIO; 583a826d6dcSJosef Bacik } 584a826d6dcSJosef Bacik 585a826d6dcSJosef Bacik /* 586a826d6dcSJosef Bacik * Check to make sure that we don't point outside of the leaf, 587a826d6dcSJosef Bacik * just incase all the items are consistent to eachother, but 588a826d6dcSJosef Bacik * all point outside of the leaf. 589a826d6dcSJosef Bacik */ 590a826d6dcSJosef Bacik if (btrfs_item_end_nr(leaf, slot) > 591a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 592a826d6dcSJosef Bacik CORRUPT("slot end outside of leaf", leaf, root, slot); 593a826d6dcSJosef Bacik return -EIO; 594a826d6dcSJosef Bacik } 595a826d6dcSJosef Bacik } 596a826d6dcSJosef Bacik 597a826d6dcSJosef Bacik return 0; 598a826d6dcSJosef Bacik } 599a826d6dcSJosef Bacik 600facc8a22SMiao Xie static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio, 601facc8a22SMiao Xie u64 phy_offset, struct page *page, 602facc8a22SMiao Xie u64 start, u64 end, int mirror) 603ce9adaa5SChris Mason { 604ce9adaa5SChris Mason u64 found_start; 605ce9adaa5SChris Mason int found_level; 606ce9adaa5SChris Mason struct extent_buffer *eb; 607ce9adaa5SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 608f188591eSChris Mason int ret = 0; 609727011e0SChris Mason int reads_done; 610ce9adaa5SChris Mason 611ce9adaa5SChris Mason if (!page->private) 612ce9adaa5SChris Mason goto out; 613d397712bSChris Mason 6144f2de97aSJosef Bacik eb = (struct extent_buffer *)page->private; 615d397712bSChris Mason 6160b32f4bbSJosef Bacik /* the pending IO might have been the only thing that kept this buffer 6170b32f4bbSJosef Bacik * in memory. Make sure we have a ref for all this other checks 6180b32f4bbSJosef Bacik */ 6190b32f4bbSJosef Bacik extent_buffer_get(eb); 6200b32f4bbSJosef Bacik 6210b32f4bbSJosef Bacik reads_done = atomic_dec_and_test(&eb->io_pages); 622727011e0SChris Mason if (!reads_done) 623727011e0SChris Mason goto err; 624f188591eSChris Mason 6255cf1ab56SJosef Bacik eb->read_mirror = mirror; 626656f30dbSFilipe Manana if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) { 627ea466794SJosef Bacik ret = -EIO; 628ea466794SJosef Bacik goto err; 629ea466794SJosef Bacik } 630ea466794SJosef Bacik 631ce9adaa5SChris Mason found_start = btrfs_header_bytenr(eb); 632727011e0SChris Mason if (found_start != eb->start) { 63368b663d1SDavid Sterba printk_ratelimited(KERN_ERR "BTRFS (device %s): bad tree block start " 634193f284dSChris Mason "%llu %llu\n", 63529549aecSWang Shilong eb->fs_info->sb->s_id, found_start, eb->start); 636f188591eSChris Mason ret = -EIO; 637ce9adaa5SChris Mason goto err; 638ce9adaa5SChris Mason } 63901d58472SDaniel Dressler if (check_tree_block_fsid(root->fs_info, eb)) { 64068b663d1SDavid Sterba printk_ratelimited(KERN_ERR "BTRFS (device %s): bad fsid on block %llu\n", 64129549aecSWang Shilong eb->fs_info->sb->s_id, eb->start); 6421259ab75SChris Mason ret = -EIO; 6431259ab75SChris Mason goto err; 6441259ab75SChris Mason } 645ce9adaa5SChris Mason found_level = btrfs_header_level(eb); 6461c24c3ceSJosef Bacik if (found_level >= BTRFS_MAX_LEVEL) { 64768b663d1SDavid Sterba btrfs_err(root->fs_info, "bad tree block level %d", 6481c24c3ceSJosef Bacik (int)btrfs_header_level(eb)); 6491c24c3ceSJosef Bacik ret = -EIO; 6501c24c3ceSJosef Bacik goto err; 6511c24c3ceSJosef Bacik } 652ce9adaa5SChris Mason 65385d4e461SChris Mason btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), 65485d4e461SChris Mason eb, found_level); 6554008c04aSChris Mason 65601d58472SDaniel Dressler ret = csum_tree_block(root->fs_info, eb, 1); 657a826d6dcSJosef Bacik if (ret) { 658f188591eSChris Mason ret = -EIO; 659a826d6dcSJosef Bacik goto err; 660a826d6dcSJosef Bacik } 661a826d6dcSJosef Bacik 662a826d6dcSJosef Bacik /* 663a826d6dcSJosef Bacik * If this is a leaf block and it is corrupt, set the corrupt bit so 664a826d6dcSJosef Bacik * that we don't try and read the other copies of this block, just 665a826d6dcSJosef Bacik * return -EIO. 666a826d6dcSJosef Bacik */ 667a826d6dcSJosef Bacik if (found_level == 0 && check_leaf(root, eb)) { 668a826d6dcSJosef Bacik set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); 669a826d6dcSJosef Bacik ret = -EIO; 670a826d6dcSJosef Bacik } 671ce9adaa5SChris Mason 6720b32f4bbSJosef Bacik if (!ret) 6730b32f4bbSJosef Bacik set_extent_buffer_uptodate(eb); 674ce9adaa5SChris Mason err: 67579fb65a1SJosef Bacik if (reads_done && 67679fb65a1SJosef Bacik test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) 6774bb31e92SArne Jansen btree_readahead_hook(root, eb, eb->start, ret); 6784bb31e92SArne Jansen 67953b381b3SDavid Woodhouse if (ret) { 68053b381b3SDavid Woodhouse /* 68153b381b3SDavid Woodhouse * our io error hook is going to dec the io pages 68253b381b3SDavid Woodhouse * again, we have to make sure it has something 68353b381b3SDavid Woodhouse * to decrement 68453b381b3SDavid Woodhouse */ 68553b381b3SDavid Woodhouse atomic_inc(&eb->io_pages); 6860b32f4bbSJosef Bacik clear_extent_buffer_uptodate(eb); 68753b381b3SDavid Woodhouse } 6880b32f4bbSJosef Bacik free_extent_buffer(eb); 689ce9adaa5SChris Mason out: 690f188591eSChris Mason return ret; 691ce9adaa5SChris Mason } 692ce9adaa5SChris Mason 693ea466794SJosef Bacik static int btree_io_failed_hook(struct page *page, int failed_mirror) 6944bb31e92SArne Jansen { 6954bb31e92SArne Jansen struct extent_buffer *eb; 6964bb31e92SArne Jansen struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 6974bb31e92SArne Jansen 6984f2de97aSJosef Bacik eb = (struct extent_buffer *)page->private; 699656f30dbSFilipe Manana set_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); 7005cf1ab56SJosef Bacik eb->read_mirror = failed_mirror; 70153b381b3SDavid Woodhouse atomic_dec(&eb->io_pages); 702ea466794SJosef Bacik if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) 7034bb31e92SArne Jansen btree_readahead_hook(root, eb, eb->start, -EIO); 7044bb31e92SArne Jansen return -EIO; /* we fixed nothing */ 7054bb31e92SArne Jansen } 7064bb31e92SArne Jansen 7074246a0b6SChristoph Hellwig static void end_workqueue_bio(struct bio *bio) 708ce9adaa5SChris Mason { 70997eb6b69SDavid Sterba struct btrfs_end_io_wq *end_io_wq = bio->bi_private; 710ce9adaa5SChris Mason struct btrfs_fs_info *fs_info; 7119e0af237SLiu Bo struct btrfs_workqueue *wq; 7129e0af237SLiu Bo btrfs_work_func_t func; 713ce9adaa5SChris Mason 714ce9adaa5SChris Mason fs_info = end_io_wq->info; 7154246a0b6SChristoph Hellwig end_io_wq->error = bio->bi_error; 716d20f7043SChris Mason 7177b6d91daSChristoph Hellwig if (bio->bi_rw & REQ_WRITE) { 7189e0af237SLiu Bo if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) { 7199e0af237SLiu Bo wq = fs_info->endio_meta_write_workers; 7209e0af237SLiu Bo func = btrfs_endio_meta_write_helper; 7219e0af237SLiu Bo } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) { 7229e0af237SLiu Bo wq = fs_info->endio_freespace_worker; 7239e0af237SLiu Bo func = btrfs_freespace_write_helper; 7249e0af237SLiu Bo } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) { 7259e0af237SLiu Bo wq = fs_info->endio_raid56_workers; 7269e0af237SLiu Bo func = btrfs_endio_raid56_helper; 727d20f7043SChris Mason } else { 7289e0af237SLiu Bo wq = fs_info->endio_write_workers; 7299e0af237SLiu Bo func = btrfs_endio_write_helper; 730d20f7043SChris Mason } 7319e0af237SLiu Bo } else { 7328b110e39SMiao Xie if (unlikely(end_io_wq->metadata == 7338b110e39SMiao Xie BTRFS_WQ_ENDIO_DIO_REPAIR)) { 7348b110e39SMiao Xie wq = fs_info->endio_repair_workers; 7358b110e39SMiao Xie func = btrfs_endio_repair_helper; 7368b110e39SMiao Xie } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) { 7379e0af237SLiu Bo wq = fs_info->endio_raid56_workers; 7389e0af237SLiu Bo func = btrfs_endio_raid56_helper; 7399e0af237SLiu Bo } else if (end_io_wq->metadata) { 7409e0af237SLiu Bo wq = fs_info->endio_meta_workers; 7419e0af237SLiu Bo func = btrfs_endio_meta_helper; 7429e0af237SLiu Bo } else { 7439e0af237SLiu Bo wq = fs_info->endio_workers; 7449e0af237SLiu Bo func = btrfs_endio_helper; 7459e0af237SLiu Bo } 7469e0af237SLiu Bo } 7479e0af237SLiu Bo 7489e0af237SLiu Bo btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL); 7499e0af237SLiu Bo btrfs_queue_work(wq, &end_io_wq->work); 750ce9adaa5SChris Mason } 751ce9adaa5SChris Mason 75222c59948SChris Mason int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 753bfebd8b5SDavid Sterba enum btrfs_wq_endio_type metadata) 7540b86a832SChris Mason { 75597eb6b69SDavid Sterba struct btrfs_end_io_wq *end_io_wq; 7568b110e39SMiao Xie 75797eb6b69SDavid Sterba end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS); 758ce9adaa5SChris Mason if (!end_io_wq) 759ce9adaa5SChris Mason return -ENOMEM; 760ce9adaa5SChris Mason 761ce9adaa5SChris Mason end_io_wq->private = bio->bi_private; 762ce9adaa5SChris Mason end_io_wq->end_io = bio->bi_end_io; 76322c59948SChris Mason end_io_wq->info = info; 764ce9adaa5SChris Mason end_io_wq->error = 0; 765ce9adaa5SChris Mason end_io_wq->bio = bio; 76622c59948SChris Mason end_io_wq->metadata = metadata; 767ce9adaa5SChris Mason 768ce9adaa5SChris Mason bio->bi_private = end_io_wq; 769ce9adaa5SChris Mason bio->bi_end_io = end_workqueue_bio; 77022c59948SChris Mason return 0; 77122c59948SChris Mason } 77222c59948SChris Mason 773b64a2851SChris Mason unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) 7744854ddd0SChris Mason { 7754854ddd0SChris Mason unsigned long limit = min_t(unsigned long, 7765cdc7ad3SQu Wenruo info->thread_pool_size, 7774854ddd0SChris Mason info->fs_devices->open_devices); 7784854ddd0SChris Mason return 256 * limit; 7794854ddd0SChris Mason } 7804854ddd0SChris Mason 7814a69a410SChris Mason static void run_one_async_start(struct btrfs_work *work) 7824a69a410SChris Mason { 7834a69a410SChris Mason struct async_submit_bio *async; 78479787eaaSJeff Mahoney int ret; 7854a69a410SChris Mason 7864a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 78779787eaaSJeff Mahoney ret = async->submit_bio_start(async->inode, async->rw, async->bio, 788eaf25d93SChris Mason async->mirror_num, async->bio_flags, 789eaf25d93SChris Mason async->bio_offset); 79079787eaaSJeff Mahoney if (ret) 79179787eaaSJeff Mahoney async->error = ret; 7924a69a410SChris Mason } 7934a69a410SChris Mason 7944a69a410SChris Mason static void run_one_async_done(struct btrfs_work *work) 7958b712842SChris Mason { 7968b712842SChris Mason struct btrfs_fs_info *fs_info; 7978b712842SChris Mason struct async_submit_bio *async; 7984854ddd0SChris Mason int limit; 7998b712842SChris Mason 8008b712842SChris Mason async = container_of(work, struct async_submit_bio, work); 8018b712842SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 8024854ddd0SChris Mason 803b64a2851SChris Mason limit = btrfs_async_submit_limit(fs_info); 8044854ddd0SChris Mason limit = limit * 2 / 3; 8054854ddd0SChris Mason 80666657b31SJosef Bacik if (atomic_dec_return(&fs_info->nr_async_submits) < limit && 807b64a2851SChris Mason waitqueue_active(&fs_info->async_submit_wait)) 8084854ddd0SChris Mason wake_up(&fs_info->async_submit_wait); 8094854ddd0SChris Mason 81079787eaaSJeff Mahoney /* If an error occured we just want to clean up the bio and move on */ 81179787eaaSJeff Mahoney if (async->error) { 8124246a0b6SChristoph Hellwig async->bio->bi_error = async->error; 8134246a0b6SChristoph Hellwig bio_endio(async->bio); 81479787eaaSJeff Mahoney return; 81579787eaaSJeff Mahoney } 81679787eaaSJeff Mahoney 8174a69a410SChris Mason async->submit_bio_done(async->inode, async->rw, async->bio, 818eaf25d93SChris Mason async->mirror_num, async->bio_flags, 819eaf25d93SChris Mason async->bio_offset); 8204a69a410SChris Mason } 8214a69a410SChris Mason 8224a69a410SChris Mason static void run_one_async_free(struct btrfs_work *work) 8234a69a410SChris Mason { 8244a69a410SChris Mason struct async_submit_bio *async; 8254a69a410SChris Mason 8264a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 8278b712842SChris Mason kfree(async); 8288b712842SChris Mason } 8298b712842SChris Mason 83044b8bd7eSChris Mason int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 83144b8bd7eSChris Mason int rw, struct bio *bio, int mirror_num, 832c8b97818SChris Mason unsigned long bio_flags, 833eaf25d93SChris Mason u64 bio_offset, 8344a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start, 8354a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done) 83644b8bd7eSChris Mason { 83744b8bd7eSChris Mason struct async_submit_bio *async; 83844b8bd7eSChris Mason 83944b8bd7eSChris Mason async = kmalloc(sizeof(*async), GFP_NOFS); 84044b8bd7eSChris Mason if (!async) 84144b8bd7eSChris Mason return -ENOMEM; 84244b8bd7eSChris Mason 84344b8bd7eSChris Mason async->inode = inode; 84444b8bd7eSChris Mason async->rw = rw; 84544b8bd7eSChris Mason async->bio = bio; 84644b8bd7eSChris Mason async->mirror_num = mirror_num; 8474a69a410SChris Mason async->submit_bio_start = submit_bio_start; 8484a69a410SChris Mason async->submit_bio_done = submit_bio_done; 8494a69a410SChris Mason 8509e0af237SLiu Bo btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start, 8515cdc7ad3SQu Wenruo run_one_async_done, run_one_async_free); 8524a69a410SChris Mason 853c8b97818SChris Mason async->bio_flags = bio_flags; 854eaf25d93SChris Mason async->bio_offset = bio_offset; 8558c8bee1dSChris Mason 85679787eaaSJeff Mahoney async->error = 0; 85779787eaaSJeff Mahoney 858cb03c743SChris Mason atomic_inc(&fs_info->nr_async_submits); 859d313d7a3SChris Mason 8607b6d91daSChristoph Hellwig if (rw & REQ_SYNC) 8615cdc7ad3SQu Wenruo btrfs_set_work_high_priority(&async->work); 862d313d7a3SChris Mason 8635cdc7ad3SQu Wenruo btrfs_queue_work(fs_info->workers, &async->work); 8649473f16cSChris Mason 865771ed689SChris Mason while (atomic_read(&fs_info->async_submit_draining) && 866771ed689SChris Mason atomic_read(&fs_info->nr_async_submits)) { 867771ed689SChris Mason wait_event(fs_info->async_submit_wait, 868771ed689SChris Mason (atomic_read(&fs_info->nr_async_submits) == 0)); 869771ed689SChris Mason } 870771ed689SChris Mason 87144b8bd7eSChris Mason return 0; 87244b8bd7eSChris Mason } 87344b8bd7eSChris Mason 874ce3ed71aSChris Mason static int btree_csum_one_bio(struct bio *bio) 875ce3ed71aSChris Mason { 8762c30c71bSKent Overstreet struct bio_vec *bvec; 877ce3ed71aSChris Mason struct btrfs_root *root; 8782c30c71bSKent Overstreet int i, ret = 0; 879ce3ed71aSChris Mason 8802c30c71bSKent Overstreet bio_for_each_segment_all(bvec, bio, i) { 881ce3ed71aSChris Mason root = BTRFS_I(bvec->bv_page->mapping->host)->root; 88201d58472SDaniel Dressler ret = csum_dirty_buffer(root->fs_info, bvec->bv_page); 88379787eaaSJeff Mahoney if (ret) 88479787eaaSJeff Mahoney break; 885ce3ed71aSChris Mason } 8862c30c71bSKent Overstreet 88779787eaaSJeff Mahoney return ret; 888ce3ed71aSChris Mason } 889ce3ed71aSChris Mason 8904a69a410SChris Mason static int __btree_submit_bio_start(struct inode *inode, int rw, 8914a69a410SChris Mason struct bio *bio, int mirror_num, 892eaf25d93SChris Mason unsigned long bio_flags, 893eaf25d93SChris Mason u64 bio_offset) 89422c59948SChris Mason { 8958b712842SChris Mason /* 8968b712842SChris Mason * when we're called for a write, we're already in the async 8975443be45SChris Mason * submission context. Just jump into btrfs_map_bio 8988b712842SChris Mason */ 89979787eaaSJeff Mahoney return btree_csum_one_bio(bio); 90022c59948SChris Mason } 90122c59948SChris Mason 9024a69a410SChris Mason static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, 903eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 904eaf25d93SChris Mason u64 bio_offset) 9054a69a410SChris Mason { 90661891923SStefan Behrens int ret; 90761891923SStefan Behrens 9088b712842SChris Mason /* 9094a69a410SChris Mason * when we're called for a write, we're already in the async 9104a69a410SChris Mason * submission context. Just jump into btrfs_map_bio 9118b712842SChris Mason */ 91261891923SStefan Behrens ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); 9134246a0b6SChristoph Hellwig if (ret) { 9144246a0b6SChristoph Hellwig bio->bi_error = ret; 9154246a0b6SChristoph Hellwig bio_endio(bio); 9164246a0b6SChristoph Hellwig } 91761891923SStefan Behrens return ret; 9180b86a832SChris Mason } 9190b86a832SChris Mason 920de0022b9SJosef Bacik static int check_async_write(struct inode *inode, unsigned long bio_flags) 921de0022b9SJosef Bacik { 922de0022b9SJosef Bacik if (bio_flags & EXTENT_BIO_TREE_LOG) 923de0022b9SJosef Bacik return 0; 924de0022b9SJosef Bacik #ifdef CONFIG_X86 925de0022b9SJosef Bacik if (cpu_has_xmm4_2) 926de0022b9SJosef Bacik return 0; 927de0022b9SJosef Bacik #endif 928de0022b9SJosef Bacik return 1; 929de0022b9SJosef Bacik } 930de0022b9SJosef Bacik 93144b8bd7eSChris Mason static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 932eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 933eaf25d93SChris Mason u64 bio_offset) 93444b8bd7eSChris Mason { 935de0022b9SJosef Bacik int async = check_async_write(inode, bio_flags); 9364a69a410SChris Mason int ret; 937cad321adSChris Mason 9387b6d91daSChristoph Hellwig if (!(rw & REQ_WRITE)) { 939cad321adSChris Mason /* 940cad321adSChris Mason * called for a read, do the setup so that checksum validation 941cad321adSChris Mason * can happen in the async kernel threads 942cad321adSChris Mason */ 943f3f266abSChris Mason ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, 944bfebd8b5SDavid Sterba bio, BTRFS_WQ_ENDIO_METADATA); 9451d4284bdSChris Mason if (ret) 94661891923SStefan Behrens goto out_w_error; 94761891923SStefan Behrens ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 9486f3577bdSChris Mason mirror_num, 0); 949de0022b9SJosef Bacik } else if (!async) { 950de0022b9SJosef Bacik ret = btree_csum_one_bio(bio); 951de0022b9SJosef Bacik if (ret) 95261891923SStefan Behrens goto out_w_error; 95361891923SStefan Behrens ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 954de0022b9SJosef Bacik mirror_num, 0); 95561891923SStefan Behrens } else { 956cad321adSChris Mason /* 95761891923SStefan Behrens * kthread helpers are used to submit writes so that 95861891923SStefan Behrens * checksumming can happen in parallel across all CPUs 959cad321adSChris Mason */ 96061891923SStefan Behrens ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, 961c8b97818SChris Mason inode, rw, bio, mirror_num, 0, 962eaf25d93SChris Mason bio_offset, 9634a69a410SChris Mason __btree_submit_bio_start, 9644a69a410SChris Mason __btree_submit_bio_done); 96544b8bd7eSChris Mason } 96644b8bd7eSChris Mason 9674246a0b6SChristoph Hellwig if (ret) 9684246a0b6SChristoph Hellwig goto out_w_error; 9694246a0b6SChristoph Hellwig return 0; 9704246a0b6SChristoph Hellwig 97161891923SStefan Behrens out_w_error: 9724246a0b6SChristoph Hellwig bio->bi_error = ret; 9734246a0b6SChristoph Hellwig bio_endio(bio); 97461891923SStefan Behrens return ret; 97561891923SStefan Behrens } 97661891923SStefan Behrens 9773dd1462eSJan Beulich #ifdef CONFIG_MIGRATION 978784b4e29SChris Mason static int btree_migratepage(struct address_space *mapping, 979a6bc32b8SMel Gorman struct page *newpage, struct page *page, 980a6bc32b8SMel Gorman enum migrate_mode mode) 981784b4e29SChris Mason { 982784b4e29SChris Mason /* 983784b4e29SChris Mason * we can't safely write a btree page from here, 984784b4e29SChris Mason * we haven't done the locking hook 985784b4e29SChris Mason */ 986784b4e29SChris Mason if (PageDirty(page)) 987784b4e29SChris Mason return -EAGAIN; 988784b4e29SChris Mason /* 989784b4e29SChris Mason * Buffers may be managed in a filesystem specific way. 990784b4e29SChris Mason * We must have no buffers or drop them. 991784b4e29SChris Mason */ 992784b4e29SChris Mason if (page_has_private(page) && 993784b4e29SChris Mason !try_to_release_page(page, GFP_KERNEL)) 994784b4e29SChris Mason return -EAGAIN; 995a6bc32b8SMel Gorman return migrate_page(mapping, newpage, page, mode); 996784b4e29SChris Mason } 9973dd1462eSJan Beulich #endif 998784b4e29SChris Mason 9990da5468fSChris Mason 10000da5468fSChris Mason static int btree_writepages(struct address_space *mapping, 10010da5468fSChris Mason struct writeback_control *wbc) 10020da5468fSChris Mason { 1003e2d84521SMiao Xie struct btrfs_fs_info *fs_info; 1004e2d84521SMiao Xie int ret; 1005e2d84521SMiao Xie 1006d8d5f3e1SChris Mason if (wbc->sync_mode == WB_SYNC_NONE) { 1007448d640bSChris Mason 1008448d640bSChris Mason if (wbc->for_kupdate) 1009448d640bSChris Mason return 0; 1010448d640bSChris Mason 1011e2d84521SMiao Xie fs_info = BTRFS_I(mapping->host)->root->fs_info; 1012b9473439SChris Mason /* this is a bit racy, but that's ok */ 1013e2d84521SMiao Xie ret = percpu_counter_compare(&fs_info->dirty_metadata_bytes, 1014e2d84521SMiao Xie BTRFS_DIRTY_METADATA_THRESH); 1015e2d84521SMiao Xie if (ret < 0) 1016793955bcSChris Mason return 0; 1017793955bcSChris Mason } 10180b32f4bbSJosef Bacik return btree_write_cache_pages(mapping, wbc); 10190da5468fSChris Mason } 10200da5468fSChris Mason 1021b2950863SChristoph Hellwig static int btree_readpage(struct file *file, struct page *page) 10225f39d397SChris Mason { 1023d1310b2eSChris Mason struct extent_io_tree *tree; 1024d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 10258ddc7d9cSJan Schmidt return extent_read_full_page(tree, page, btree_get_extent, 0); 10265f39d397SChris Mason } 10275f39d397SChris Mason 102870dec807SChris Mason static int btree_releasepage(struct page *page, gfp_t gfp_flags) 10295f39d397SChris Mason { 103098509cfcSChris Mason if (PageWriteback(page) || PageDirty(page)) 103198509cfcSChris Mason return 0; 10320c4e538bSDavid Sterba 1033f7a52a40SDavid Sterba return try_release_extent_buffer(page); 1034d98237b3SChris Mason } 1035d98237b3SChris Mason 1036d47992f8SLukas Czerner static void btree_invalidatepage(struct page *page, unsigned int offset, 1037d47992f8SLukas Czerner unsigned int length) 1038d98237b3SChris Mason { 1039d1310b2eSChris Mason struct extent_io_tree *tree; 1040d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 10415f39d397SChris Mason extent_invalidatepage(tree, page, offset); 10425f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 10439ad6b7bcSChris Mason if (PagePrivate(page)) { 1044efe120a0SFrank Holton btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info, 1045efe120a0SFrank Holton "page private not zero on page %llu", 1046efe120a0SFrank Holton (unsigned long long)page_offset(page)); 10479ad6b7bcSChris Mason ClearPagePrivate(page); 10489ad6b7bcSChris Mason set_page_private(page, 0); 10499ad6b7bcSChris Mason page_cache_release(page); 10509ad6b7bcSChris Mason } 1051d98237b3SChris Mason } 1052d98237b3SChris Mason 10530b32f4bbSJosef Bacik static int btree_set_page_dirty(struct page *page) 10540b32f4bbSJosef Bacik { 1055bb146eb2SJosef Bacik #ifdef DEBUG 10560b32f4bbSJosef Bacik struct extent_buffer *eb; 10570b32f4bbSJosef Bacik 10580b32f4bbSJosef Bacik BUG_ON(!PagePrivate(page)); 10590b32f4bbSJosef Bacik eb = (struct extent_buffer *)page->private; 10600b32f4bbSJosef Bacik BUG_ON(!eb); 10610b32f4bbSJosef Bacik BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); 10620b32f4bbSJosef Bacik BUG_ON(!atomic_read(&eb->refs)); 10630b32f4bbSJosef Bacik btrfs_assert_tree_locked(eb); 1064bb146eb2SJosef Bacik #endif 10650b32f4bbSJosef Bacik return __set_page_dirty_nobuffers(page); 10660b32f4bbSJosef Bacik } 10670b32f4bbSJosef Bacik 10687f09410bSAlexey Dobriyan static const struct address_space_operations btree_aops = { 1069d98237b3SChris Mason .readpage = btree_readpage, 10700da5468fSChris Mason .writepages = btree_writepages, 10715f39d397SChris Mason .releasepage = btree_releasepage, 10725f39d397SChris Mason .invalidatepage = btree_invalidatepage, 10735a92bc88SChris Mason #ifdef CONFIG_MIGRATION 1074784b4e29SChris Mason .migratepage = btree_migratepage, 10755a92bc88SChris Mason #endif 10760b32f4bbSJosef Bacik .set_page_dirty = btree_set_page_dirty, 1077d98237b3SChris Mason }; 1078123abc88SChris Mason 1079d3e46feaSDavid Sterba void readahead_tree_block(struct btrfs_root *root, u64 bytenr) 1080090d1875SChris Mason { 10815f39d397SChris Mason struct extent_buffer *buf = NULL; 10825f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1083090d1875SChris Mason 1084a83fffb7SDavid Sterba buf = btrfs_find_create_tree_block(root, bytenr); 10855f39d397SChris Mason if (!buf) 10866197d86eSDavid Sterba return; 1087d1310b2eSChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, 1088bb82ab88SArne Jansen buf, 0, WAIT_NONE, btree_get_extent, 0); 10895f39d397SChris Mason free_extent_buffer(buf); 1090090d1875SChris Mason } 1091090d1875SChris Mason 1092c0dcaa4dSDavid Sterba int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, 1093ab0fff03SArne Jansen int mirror_num, struct extent_buffer **eb) 1094ab0fff03SArne Jansen { 1095ab0fff03SArne Jansen struct extent_buffer *buf = NULL; 1096ab0fff03SArne Jansen struct inode *btree_inode = root->fs_info->btree_inode; 1097ab0fff03SArne Jansen struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree; 1098ab0fff03SArne Jansen int ret; 1099ab0fff03SArne Jansen 1100a83fffb7SDavid Sterba buf = btrfs_find_create_tree_block(root, bytenr); 1101ab0fff03SArne Jansen if (!buf) 1102ab0fff03SArne Jansen return 0; 1103ab0fff03SArne Jansen 1104ab0fff03SArne Jansen set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags); 1105ab0fff03SArne Jansen 1106ab0fff03SArne Jansen ret = read_extent_buffer_pages(io_tree, buf, 0, WAIT_PAGE_LOCK, 1107ab0fff03SArne Jansen btree_get_extent, mirror_num); 1108ab0fff03SArne Jansen if (ret) { 1109ab0fff03SArne Jansen free_extent_buffer(buf); 1110ab0fff03SArne Jansen return ret; 1111ab0fff03SArne Jansen } 1112ab0fff03SArne Jansen 1113ab0fff03SArne Jansen if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) { 1114ab0fff03SArne Jansen free_extent_buffer(buf); 1115ab0fff03SArne Jansen return -EIO; 11160b32f4bbSJosef Bacik } else if (extent_buffer_uptodate(buf)) { 1117ab0fff03SArne Jansen *eb = buf; 1118ab0fff03SArne Jansen } else { 1119ab0fff03SArne Jansen free_extent_buffer(buf); 1120ab0fff03SArne Jansen } 1121ab0fff03SArne Jansen return 0; 1122ab0fff03SArne Jansen } 1123ab0fff03SArne Jansen 112401d58472SDaniel Dressler struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info, 11250308af44SDavid Sterba u64 bytenr) 11260999df54SChris Mason { 112701d58472SDaniel Dressler return find_extent_buffer(fs_info, bytenr); 11280999df54SChris Mason } 11290999df54SChris Mason 11300999df54SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 1131a83fffb7SDavid Sterba u64 bytenr) 11320999df54SChris Mason { 1133fccb84c9SDavid Sterba if (btrfs_test_is_dummy_root(root)) 1134ce3e6984SDavid Sterba return alloc_test_extent_buffer(root->fs_info, bytenr); 1135ce3e6984SDavid Sterba return alloc_extent_buffer(root->fs_info, bytenr); 11360999df54SChris Mason } 11370999df54SChris Mason 11380999df54SChris Mason 1139e02119d5SChris Mason int btrfs_write_tree_block(struct extent_buffer *buf) 1140e02119d5SChris Mason { 1141727011e0SChris Mason return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start, 11428aa38c31SChristoph Hellwig buf->start + buf->len - 1); 1143e02119d5SChris Mason } 1144e02119d5SChris Mason 1145e02119d5SChris Mason int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) 1146e02119d5SChris Mason { 1147727011e0SChris Mason return filemap_fdatawait_range(buf->pages[0]->mapping, 11488aa38c31SChristoph Hellwig buf->start, buf->start + buf->len - 1); 1149e02119d5SChris Mason } 1150e02119d5SChris Mason 1151db94535dSChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, 1152ce86cd59SDavid Sterba u64 parent_transid) 1153e20d96d6SChris Mason { 11545f39d397SChris Mason struct extent_buffer *buf = NULL; 115519c00ddcSChris Mason int ret; 115619c00ddcSChris Mason 1157a83fffb7SDavid Sterba buf = btrfs_find_create_tree_block(root, bytenr); 11585f39d397SChris Mason if (!buf) 115964c043deSLiu Bo return ERR_PTR(-ENOMEM); 1160e4204dedSChris Mason 1161ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 11620f0fe8f7SFilipe David Borba Manana if (ret) { 11630f0fe8f7SFilipe David Borba Manana free_extent_buffer(buf); 116464c043deSLiu Bo return ERR_PTR(ret); 11650f0fe8f7SFilipe David Borba Manana } 11665f39d397SChris Mason return buf; 1167ce9adaa5SChris Mason 1168eb60ceacSChris Mason } 1169eb60ceacSChris Mason 117001d58472SDaniel Dressler void clean_tree_block(struct btrfs_trans_handle *trans, 117101d58472SDaniel Dressler struct btrfs_fs_info *fs_info, 11725f39d397SChris Mason struct extent_buffer *buf) 1173ed2ff2cbSChris Mason { 117455c69072SChris Mason if (btrfs_header_generation(buf) == 1175e2d84521SMiao Xie fs_info->running_transaction->transid) { 1176b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 1177b4ce94deSChris Mason 1178b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { 1179e2d84521SMiao Xie __percpu_counter_add(&fs_info->dirty_metadata_bytes, 1180e2d84521SMiao Xie -buf->len, 1181e2d84521SMiao Xie fs_info->dirty_metadata_batch); 1182b9473439SChris Mason /* ugh, clear_extent_buffer_dirty needs to lock the page */ 1183b9473439SChris Mason btrfs_set_lock_blocking(buf); 11840b32f4bbSJosef Bacik clear_extent_buffer_dirty(buf); 1185925baeddSChris Mason } 11865f39d397SChris Mason } 1187ed7b63ebSJosef Bacik } 11885f39d397SChris Mason 11898257b2dcSMiao Xie static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void) 11908257b2dcSMiao Xie { 11918257b2dcSMiao Xie struct btrfs_subvolume_writers *writers; 11928257b2dcSMiao Xie int ret; 11938257b2dcSMiao Xie 11948257b2dcSMiao Xie writers = kmalloc(sizeof(*writers), GFP_NOFS); 11958257b2dcSMiao Xie if (!writers) 11968257b2dcSMiao Xie return ERR_PTR(-ENOMEM); 11978257b2dcSMiao Xie 1198908c7f19STejun Heo ret = percpu_counter_init(&writers->counter, 0, GFP_KERNEL); 11998257b2dcSMiao Xie if (ret < 0) { 12008257b2dcSMiao Xie kfree(writers); 12018257b2dcSMiao Xie return ERR_PTR(ret); 12028257b2dcSMiao Xie } 12038257b2dcSMiao Xie 12048257b2dcSMiao Xie init_waitqueue_head(&writers->wait); 12058257b2dcSMiao Xie return writers; 12068257b2dcSMiao Xie } 12078257b2dcSMiao Xie 12088257b2dcSMiao Xie static void 12098257b2dcSMiao Xie btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers) 12108257b2dcSMiao Xie { 12118257b2dcSMiao Xie percpu_counter_destroy(&writers->counter); 12128257b2dcSMiao Xie kfree(writers); 12138257b2dcSMiao Xie } 12148257b2dcSMiao Xie 1215707e8a07SDavid Sterba static void __setup_root(u32 nodesize, u32 sectorsize, u32 stripesize, 1216707e8a07SDavid Sterba struct btrfs_root *root, struct btrfs_fs_info *fs_info, 1217e20d96d6SChris Mason u64 objectid) 1218d97e63b6SChris Mason { 1219cfaa7295SChris Mason root->node = NULL; 1220a28ec197SChris Mason root->commit_root = NULL; 1221db94535dSChris Mason root->sectorsize = sectorsize; 1222db94535dSChris Mason root->nodesize = nodesize; 122387ee04ebSChris Mason root->stripesize = stripesize; 122427cdeb70SMiao Xie root->state = 0; 1225d68fc57bSYan, Zheng root->orphan_cleanup_state = 0; 12260b86a832SChris Mason 12270f7d52f4SChris Mason root->objectid = objectid; 12280f7d52f4SChris Mason root->last_trans = 0; 122913a8a7c8SYan, Zheng root->highest_objectid = 0; 1230eb73c1b7SMiao Xie root->nr_delalloc_inodes = 0; 1231199c2a9cSMiao Xie root->nr_ordered_extents = 0; 123258176a96SJosef Bacik root->name = NULL; 12336bef4d31SEric Paris root->inode_tree = RB_ROOT; 123416cdcec7SMiao Xie INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC); 1235f0486c68SYan, Zheng root->block_rsv = NULL; 1236d68fc57bSYan, Zheng root->orphan_block_rsv = NULL; 12370b86a832SChris Mason 12380b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 12395d4f98a2SYan Zheng INIT_LIST_HEAD(&root->root_list); 1240eb73c1b7SMiao Xie INIT_LIST_HEAD(&root->delalloc_inodes); 1241eb73c1b7SMiao Xie INIT_LIST_HEAD(&root->delalloc_root); 1242199c2a9cSMiao Xie INIT_LIST_HEAD(&root->ordered_extents); 1243199c2a9cSMiao Xie INIT_LIST_HEAD(&root->ordered_root); 12442ab28f32SJosef Bacik INIT_LIST_HEAD(&root->logged_list[0]); 12452ab28f32SJosef Bacik INIT_LIST_HEAD(&root->logged_list[1]); 1246d68fc57bSYan, Zheng spin_lock_init(&root->orphan_lock); 12475d4f98a2SYan Zheng spin_lock_init(&root->inode_lock); 1248eb73c1b7SMiao Xie spin_lock_init(&root->delalloc_lock); 1249199c2a9cSMiao Xie spin_lock_init(&root->ordered_extent_lock); 1250f0486c68SYan, Zheng spin_lock_init(&root->accounting_lock); 12512ab28f32SJosef Bacik spin_lock_init(&root->log_extents_lock[0]); 12522ab28f32SJosef Bacik spin_lock_init(&root->log_extents_lock[1]); 1253a2135011SChris Mason mutex_init(&root->objectid_mutex); 1254e02119d5SChris Mason mutex_init(&root->log_mutex); 125531f3d255SMiao Xie mutex_init(&root->ordered_extent_mutex); 1256573bfb72SMiao Xie mutex_init(&root->delalloc_mutex); 12577237f183SYan Zheng init_waitqueue_head(&root->log_writer_wait); 12587237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[0]); 12597237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[1]); 12608b050d35SMiao Xie INIT_LIST_HEAD(&root->log_ctxs[0]); 12618b050d35SMiao Xie INIT_LIST_HEAD(&root->log_ctxs[1]); 12627237f183SYan Zheng atomic_set(&root->log_commit[0], 0); 12637237f183SYan Zheng atomic_set(&root->log_commit[1], 0); 12647237f183SYan Zheng atomic_set(&root->log_writers, 0); 12652ecb7923SMiao Xie atomic_set(&root->log_batch, 0); 12668a35d95fSJosef Bacik atomic_set(&root->orphan_inodes, 0); 1267b0feb9d9SMiao Xie atomic_set(&root->refs, 1); 12688257b2dcSMiao Xie atomic_set(&root->will_be_snapshoted, 0); 12697237f183SYan Zheng root->log_transid = 0; 1270d1433debSMiao Xie root->log_transid_committed = -1; 1271257c62e1SChris Mason root->last_log_commit = 0; 127206ea65a3SJosef Bacik if (fs_info) 1273d0c803c4SChris Mason extent_io_tree_init(&root->dirty_log_pages, 1274f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 1275017e5369SChris Mason 12763768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 12773768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 12786702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 127906ea65a3SJosef Bacik if (fs_info) 12803f157a2fSChris Mason root->defrag_trans_start = fs_info->generation; 128106ea65a3SJosef Bacik else 128206ea65a3SJosef Bacik root->defrag_trans_start = 0; 12834d775673SChris Mason root->root_key.objectid = objectid; 12840ee5dc67SAl Viro root->anon_dev = 0; 12858ea05e3aSAlexander Block 12865f3ab90aSAnand Jain spin_lock_init(&root->root_item_lock); 12873768f368SChris Mason } 12883768f368SChris Mason 1289f84a8bd6SAl Viro static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info) 12906f07e42eSAl Viro { 12916f07e42eSAl Viro struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS); 12926f07e42eSAl Viro if (root) 12936f07e42eSAl Viro root->fs_info = fs_info; 12946f07e42eSAl Viro return root; 12956f07e42eSAl Viro } 12966f07e42eSAl Viro 129706ea65a3SJosef Bacik #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 129806ea65a3SJosef Bacik /* Should only be used by the testing infrastructure */ 129906ea65a3SJosef Bacik struct btrfs_root *btrfs_alloc_dummy_root(void) 130006ea65a3SJosef Bacik { 130106ea65a3SJosef Bacik struct btrfs_root *root; 130206ea65a3SJosef Bacik 130306ea65a3SJosef Bacik root = btrfs_alloc_root(NULL); 130406ea65a3SJosef Bacik if (!root) 130506ea65a3SJosef Bacik return ERR_PTR(-ENOMEM); 1306707e8a07SDavid Sterba __setup_root(4096, 4096, 4096, root, NULL, 1); 130727cdeb70SMiao Xie set_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state); 1308faa2dbf0SJosef Bacik root->alloc_bytenr = 0; 130906ea65a3SJosef Bacik 131006ea65a3SJosef Bacik return root; 131106ea65a3SJosef Bacik } 131206ea65a3SJosef Bacik #endif 131306ea65a3SJosef Bacik 131420897f5cSArne Jansen struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 131520897f5cSArne Jansen struct btrfs_fs_info *fs_info, 131620897f5cSArne Jansen u64 objectid) 131720897f5cSArne Jansen { 131820897f5cSArne Jansen struct extent_buffer *leaf; 131920897f5cSArne Jansen struct btrfs_root *tree_root = fs_info->tree_root; 132020897f5cSArne Jansen struct btrfs_root *root; 132120897f5cSArne Jansen struct btrfs_key key; 132220897f5cSArne Jansen int ret = 0; 13236463fe58SStefan Behrens uuid_le uuid; 132420897f5cSArne Jansen 132520897f5cSArne Jansen root = btrfs_alloc_root(fs_info); 132620897f5cSArne Jansen if (!root) 132720897f5cSArne Jansen return ERR_PTR(-ENOMEM); 132820897f5cSArne Jansen 1329707e8a07SDavid Sterba __setup_root(tree_root->nodesize, tree_root->sectorsize, 1330707e8a07SDavid Sterba tree_root->stripesize, root, fs_info, objectid); 133120897f5cSArne Jansen root->root_key.objectid = objectid; 133220897f5cSArne Jansen root->root_key.type = BTRFS_ROOT_ITEM_KEY; 133320897f5cSArne Jansen root->root_key.offset = 0; 133420897f5cSArne Jansen 13354d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 133620897f5cSArne Jansen if (IS_ERR(leaf)) { 133720897f5cSArne Jansen ret = PTR_ERR(leaf); 13381dd05682STsutomu Itoh leaf = NULL; 133920897f5cSArne Jansen goto fail; 134020897f5cSArne Jansen } 134120897f5cSArne Jansen 134220897f5cSArne Jansen memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 134320897f5cSArne Jansen btrfs_set_header_bytenr(leaf, leaf->start); 134420897f5cSArne Jansen btrfs_set_header_generation(leaf, trans->transid); 134520897f5cSArne Jansen btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 134620897f5cSArne Jansen btrfs_set_header_owner(leaf, objectid); 134720897f5cSArne Jansen root->node = leaf; 134820897f5cSArne Jansen 13490a4e5586SRoss Kirk write_extent_buffer(leaf, fs_info->fsid, btrfs_header_fsid(), 135020897f5cSArne Jansen BTRFS_FSID_SIZE); 135120897f5cSArne Jansen write_extent_buffer(leaf, fs_info->chunk_tree_uuid, 1352b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 135320897f5cSArne Jansen BTRFS_UUID_SIZE); 135420897f5cSArne Jansen btrfs_mark_buffer_dirty(leaf); 135520897f5cSArne Jansen 135620897f5cSArne Jansen root->commit_root = btrfs_root_node(root); 135727cdeb70SMiao Xie set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 135820897f5cSArne Jansen 135920897f5cSArne Jansen root->root_item.flags = 0; 136020897f5cSArne Jansen root->root_item.byte_limit = 0; 136120897f5cSArne Jansen btrfs_set_root_bytenr(&root->root_item, leaf->start); 136220897f5cSArne Jansen btrfs_set_root_generation(&root->root_item, trans->transid); 136320897f5cSArne Jansen btrfs_set_root_level(&root->root_item, 0); 136420897f5cSArne Jansen btrfs_set_root_refs(&root->root_item, 1); 136520897f5cSArne Jansen btrfs_set_root_used(&root->root_item, leaf->len); 136620897f5cSArne Jansen btrfs_set_root_last_snapshot(&root->root_item, 0); 136720897f5cSArne Jansen btrfs_set_root_dirid(&root->root_item, 0); 13686463fe58SStefan Behrens uuid_le_gen(&uuid); 13696463fe58SStefan Behrens memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE); 137020897f5cSArne Jansen root->root_item.drop_level = 0; 137120897f5cSArne Jansen 137220897f5cSArne Jansen key.objectid = objectid; 137320897f5cSArne Jansen key.type = BTRFS_ROOT_ITEM_KEY; 137420897f5cSArne Jansen key.offset = 0; 137520897f5cSArne Jansen ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item); 137620897f5cSArne Jansen if (ret) 137720897f5cSArne Jansen goto fail; 137820897f5cSArne Jansen 137920897f5cSArne Jansen btrfs_tree_unlock(leaf); 138020897f5cSArne Jansen 138120897f5cSArne Jansen return root; 13821dd05682STsutomu Itoh 13831dd05682STsutomu Itoh fail: 13841dd05682STsutomu Itoh if (leaf) { 13851dd05682STsutomu Itoh btrfs_tree_unlock(leaf); 138659885b39STsutomu Itoh free_extent_buffer(root->commit_root); 13871dd05682STsutomu Itoh free_extent_buffer(leaf); 13881dd05682STsutomu Itoh } 13891dd05682STsutomu Itoh kfree(root); 13901dd05682STsutomu Itoh 13911dd05682STsutomu Itoh return ERR_PTR(ret); 139220897f5cSArne Jansen } 139320897f5cSArne Jansen 13947237f183SYan Zheng static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, 1395e02119d5SChris Mason struct btrfs_fs_info *fs_info) 13960f7d52f4SChris Mason { 13970f7d52f4SChris Mason struct btrfs_root *root; 13980f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 13997237f183SYan Zheng struct extent_buffer *leaf; 1400e02119d5SChris Mason 14016f07e42eSAl Viro root = btrfs_alloc_root(fs_info); 1402e02119d5SChris Mason if (!root) 14037237f183SYan Zheng return ERR_PTR(-ENOMEM); 1404e02119d5SChris Mason 1405707e8a07SDavid Sterba __setup_root(tree_root->nodesize, tree_root->sectorsize, 1406707e8a07SDavid Sterba tree_root->stripesize, root, fs_info, 1407707e8a07SDavid Sterba BTRFS_TREE_LOG_OBJECTID); 1408e02119d5SChris Mason 1409e02119d5SChris Mason root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; 1410e02119d5SChris Mason root->root_key.type = BTRFS_ROOT_ITEM_KEY; 1411e02119d5SChris Mason root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; 141227cdeb70SMiao Xie 14137237f183SYan Zheng /* 141427cdeb70SMiao Xie * DON'T set REF_COWS for log trees 141527cdeb70SMiao Xie * 14167237f183SYan Zheng * log trees do not get reference counted because they go away 14177237f183SYan Zheng * before a real commit is actually done. They do store pointers 14187237f183SYan Zheng * to file data extents, and those reference counts still get 14197237f183SYan Zheng * updated (along with back refs to the log tree). 14207237f183SYan Zheng */ 1421e02119d5SChris Mason 14224d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID, 14234d75f8a9SDavid Sterba NULL, 0, 0, 0); 14247237f183SYan Zheng if (IS_ERR(leaf)) { 14257237f183SYan Zheng kfree(root); 14267237f183SYan Zheng return ERR_CAST(leaf); 14277237f183SYan Zheng } 1428e02119d5SChris Mason 14295d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 14305d4f98a2SYan Zheng btrfs_set_header_bytenr(leaf, leaf->start); 14315d4f98a2SYan Zheng btrfs_set_header_generation(leaf, trans->transid); 14325d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 14335d4f98a2SYan Zheng btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); 14347237f183SYan Zheng root->node = leaf; 1435e02119d5SChris Mason 1436e02119d5SChris Mason write_extent_buffer(root->node, root->fs_info->fsid, 14370a4e5586SRoss Kirk btrfs_header_fsid(), BTRFS_FSID_SIZE); 1438e02119d5SChris Mason btrfs_mark_buffer_dirty(root->node); 1439e02119d5SChris Mason btrfs_tree_unlock(root->node); 14407237f183SYan Zheng return root; 14417237f183SYan Zheng } 14427237f183SYan Zheng 14437237f183SYan Zheng int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 14447237f183SYan Zheng struct btrfs_fs_info *fs_info) 14457237f183SYan Zheng { 14467237f183SYan Zheng struct btrfs_root *log_root; 14477237f183SYan Zheng 14487237f183SYan Zheng log_root = alloc_log_tree(trans, fs_info); 14497237f183SYan Zheng if (IS_ERR(log_root)) 14507237f183SYan Zheng return PTR_ERR(log_root); 14517237f183SYan Zheng WARN_ON(fs_info->log_root_tree); 14527237f183SYan Zheng fs_info->log_root_tree = log_root; 14537237f183SYan Zheng return 0; 14547237f183SYan Zheng } 14557237f183SYan Zheng 14567237f183SYan Zheng int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 14577237f183SYan Zheng struct btrfs_root *root) 14587237f183SYan Zheng { 14597237f183SYan Zheng struct btrfs_root *log_root; 14607237f183SYan Zheng struct btrfs_inode_item *inode_item; 14617237f183SYan Zheng 14627237f183SYan Zheng log_root = alloc_log_tree(trans, root->fs_info); 14637237f183SYan Zheng if (IS_ERR(log_root)) 14647237f183SYan Zheng return PTR_ERR(log_root); 14657237f183SYan Zheng 14667237f183SYan Zheng log_root->last_trans = trans->transid; 14677237f183SYan Zheng log_root->root_key.offset = root->root_key.objectid; 14687237f183SYan Zheng 14697237f183SYan Zheng inode_item = &log_root->root_item.inode; 14703cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 14713cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 14723cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 1473707e8a07SDavid Sterba btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); 14743cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 14757237f183SYan Zheng 14765d4f98a2SYan Zheng btrfs_set_root_node(&log_root->root_item, log_root->node); 14777237f183SYan Zheng 14787237f183SYan Zheng WARN_ON(root->log_root); 14797237f183SYan Zheng root->log_root = log_root; 14807237f183SYan Zheng root->log_transid = 0; 1481d1433debSMiao Xie root->log_transid_committed = -1; 1482257c62e1SChris Mason root->last_log_commit = 0; 1483e02119d5SChris Mason return 0; 1484e02119d5SChris Mason } 1485e02119d5SChris Mason 148635a3621bSStefan Behrens static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 1487cb517eabSMiao Xie struct btrfs_key *key) 1488e02119d5SChris Mason { 1489e02119d5SChris Mason struct btrfs_root *root; 1490e02119d5SChris Mason struct btrfs_fs_info *fs_info = tree_root->fs_info; 14910f7d52f4SChris Mason struct btrfs_path *path; 149284234f3aSYan Zheng u64 generation; 1493cb517eabSMiao Xie int ret; 1494cb517eabSMiao Xie 1495cb517eabSMiao Xie path = btrfs_alloc_path(); 1496cb517eabSMiao Xie if (!path) 1497cb517eabSMiao Xie return ERR_PTR(-ENOMEM); 14980f7d52f4SChris Mason 14996f07e42eSAl Viro root = btrfs_alloc_root(fs_info); 1500cb517eabSMiao Xie if (!root) { 1501cb517eabSMiao Xie ret = -ENOMEM; 1502cb517eabSMiao Xie goto alloc_fail; 15030f7d52f4SChris Mason } 15040f7d52f4SChris Mason 1505707e8a07SDavid Sterba __setup_root(tree_root->nodesize, tree_root->sectorsize, 1506707e8a07SDavid Sterba tree_root->stripesize, root, fs_info, key->objectid); 15070f7d52f4SChris Mason 1508cb517eabSMiao Xie ret = btrfs_find_root(tree_root, key, path, 1509cb517eabSMiao Xie &root->root_item, &root->root_key); 15100f7d52f4SChris Mason if (ret) { 151113a8a7c8SYan, Zheng if (ret > 0) 151213a8a7c8SYan, Zheng ret = -ENOENT; 1513cb517eabSMiao Xie goto find_fail; 15140f7d52f4SChris Mason } 151513a8a7c8SYan, Zheng 151684234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1517db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 1518ce86cd59SDavid Sterba generation); 151964c043deSLiu Bo if (IS_ERR(root->node)) { 152064c043deSLiu Bo ret = PTR_ERR(root->node); 1521cb517eabSMiao Xie goto find_fail; 1522cb517eabSMiao Xie } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) { 1523cb517eabSMiao Xie ret = -EIO; 152464c043deSLiu Bo free_extent_buffer(root->node); 152564c043deSLiu Bo goto find_fail; 1526416bc658SJosef Bacik } 15275d4f98a2SYan Zheng root->commit_root = btrfs_root_node(root); 152813a8a7c8SYan, Zheng out: 1529cb517eabSMiao Xie btrfs_free_path(path); 1530cb517eabSMiao Xie return root; 1531cb517eabSMiao Xie 1532cb517eabSMiao Xie find_fail: 1533cb517eabSMiao Xie kfree(root); 1534cb517eabSMiao Xie alloc_fail: 1535cb517eabSMiao Xie root = ERR_PTR(ret); 1536cb517eabSMiao Xie goto out; 1537cb517eabSMiao Xie } 1538cb517eabSMiao Xie 1539cb517eabSMiao Xie struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root, 1540cb517eabSMiao Xie struct btrfs_key *location) 1541cb517eabSMiao Xie { 1542cb517eabSMiao Xie struct btrfs_root *root; 1543cb517eabSMiao Xie 1544cb517eabSMiao Xie root = btrfs_read_tree_root(tree_root, location); 1545cb517eabSMiao Xie if (IS_ERR(root)) 1546cb517eabSMiao Xie return root; 1547cb517eabSMiao Xie 1548cb517eabSMiao Xie if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { 154927cdeb70SMiao Xie set_bit(BTRFS_ROOT_REF_COWS, &root->state); 155008fe4db1SLi Zefan btrfs_check_and_init_root_item(&root->root_item); 155108fe4db1SLi Zefan } 155213a8a7c8SYan, Zheng 15535eda7b5eSChris Mason return root; 15545eda7b5eSChris Mason } 15555eda7b5eSChris Mason 1556cb517eabSMiao Xie int btrfs_init_fs_root(struct btrfs_root *root) 1557cb517eabSMiao Xie { 1558cb517eabSMiao Xie int ret; 15598257b2dcSMiao Xie struct btrfs_subvolume_writers *writers; 1560cb517eabSMiao Xie 1561cb517eabSMiao Xie root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS); 1562cb517eabSMiao Xie root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned), 1563cb517eabSMiao Xie GFP_NOFS); 1564cb517eabSMiao Xie if (!root->free_ino_pinned || !root->free_ino_ctl) { 1565cb517eabSMiao Xie ret = -ENOMEM; 1566cb517eabSMiao Xie goto fail; 1567cb517eabSMiao Xie } 1568cb517eabSMiao Xie 15698257b2dcSMiao Xie writers = btrfs_alloc_subvolume_writers(); 15708257b2dcSMiao Xie if (IS_ERR(writers)) { 15718257b2dcSMiao Xie ret = PTR_ERR(writers); 15728257b2dcSMiao Xie goto fail; 15738257b2dcSMiao Xie } 15748257b2dcSMiao Xie root->subv_writers = writers; 15758257b2dcSMiao Xie 1576cb517eabSMiao Xie btrfs_init_free_ino_ctl(root); 157757cdc8dbSDavid Sterba spin_lock_init(&root->ino_cache_lock); 157857cdc8dbSDavid Sterba init_waitqueue_head(&root->ino_cache_wait); 1579cb517eabSMiao Xie 1580cb517eabSMiao Xie ret = get_anon_bdev(&root->anon_dev); 1581cb517eabSMiao Xie if (ret) 15828257b2dcSMiao Xie goto free_writers; 1583cb517eabSMiao Xie return 0; 15848257b2dcSMiao Xie 15858257b2dcSMiao Xie free_writers: 15868257b2dcSMiao Xie btrfs_free_subvolume_writers(root->subv_writers); 1587cb517eabSMiao Xie fail: 1588cb517eabSMiao Xie kfree(root->free_ino_ctl); 1589cb517eabSMiao Xie kfree(root->free_ino_pinned); 1590cb517eabSMiao Xie return ret; 1591cb517eabSMiao Xie } 1592cb517eabSMiao Xie 1593171170c1SSergei Trofimovich static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, 1594cb517eabSMiao Xie u64 root_id) 1595cb517eabSMiao Xie { 1596cb517eabSMiao Xie struct btrfs_root *root; 1597cb517eabSMiao Xie 1598cb517eabSMiao Xie spin_lock(&fs_info->fs_roots_radix_lock); 1599cb517eabSMiao Xie root = radix_tree_lookup(&fs_info->fs_roots_radix, 1600cb517eabSMiao Xie (unsigned long)root_id); 1601cb517eabSMiao Xie spin_unlock(&fs_info->fs_roots_radix_lock); 1602cb517eabSMiao Xie return root; 1603cb517eabSMiao Xie } 1604cb517eabSMiao Xie 1605cb517eabSMiao Xie int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, 1606cb517eabSMiao Xie struct btrfs_root *root) 1607cb517eabSMiao Xie { 1608cb517eabSMiao Xie int ret; 1609cb517eabSMiao Xie 1610cb517eabSMiao Xie ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); 1611cb517eabSMiao Xie if (ret) 1612cb517eabSMiao Xie return ret; 1613cb517eabSMiao Xie 1614cb517eabSMiao Xie spin_lock(&fs_info->fs_roots_radix_lock); 1615cb517eabSMiao Xie ret = radix_tree_insert(&fs_info->fs_roots_radix, 1616cb517eabSMiao Xie (unsigned long)root->root_key.objectid, 1617cb517eabSMiao Xie root); 1618cb517eabSMiao Xie if (ret == 0) 161927cdeb70SMiao Xie set_bit(BTRFS_ROOT_IN_RADIX, &root->state); 1620cb517eabSMiao Xie spin_unlock(&fs_info->fs_roots_radix_lock); 1621cb517eabSMiao Xie radix_tree_preload_end(); 1622cb517eabSMiao Xie 1623cb517eabSMiao Xie return ret; 1624cb517eabSMiao Xie } 1625cb517eabSMiao Xie 1626c00869f1SMiao Xie struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 1627c00869f1SMiao Xie struct btrfs_key *location, 1628c00869f1SMiao Xie bool check_ref) 16295eda7b5eSChris Mason { 16305eda7b5eSChris Mason struct btrfs_root *root; 1631381cf658SDavid Sterba struct btrfs_path *path; 16321d4c08e0SDavid Sterba struct btrfs_key key; 16335eda7b5eSChris Mason int ret; 16345eda7b5eSChris Mason 1635edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 1636edbd8d4eSChris Mason return fs_info->tree_root; 1637edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 1638edbd8d4eSChris Mason return fs_info->extent_root; 16398f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 16408f18cf13SChris Mason return fs_info->chunk_root; 16418f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 16428f18cf13SChris Mason return fs_info->dev_root; 16430403e47eSYan Zheng if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) 16440403e47eSYan Zheng return fs_info->csum_root; 1645bcef60f2SArne Jansen if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID) 1646bcef60f2SArne Jansen return fs_info->quota_root ? fs_info->quota_root : 1647bcef60f2SArne Jansen ERR_PTR(-ENOENT); 1648f7a81ea4SStefan Behrens if (location->objectid == BTRFS_UUID_TREE_OBJECTID) 1649f7a81ea4SStefan Behrens return fs_info->uuid_root ? fs_info->uuid_root : 1650f7a81ea4SStefan Behrens ERR_PTR(-ENOENT); 165170f6d82eSOmar Sandoval if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) 165270f6d82eSOmar Sandoval return fs_info->free_space_root ? fs_info->free_space_root : 165370f6d82eSOmar Sandoval ERR_PTR(-ENOENT); 16544df27c4dSYan, Zheng again: 1655cb517eabSMiao Xie root = btrfs_lookup_fs_root(fs_info, location->objectid); 165648475471SStefan Behrens if (root) { 1657c00869f1SMiao Xie if (check_ref && btrfs_root_refs(&root->root_item) == 0) 165848475471SStefan Behrens return ERR_PTR(-ENOENT); 16595eda7b5eSChris Mason return root; 166048475471SStefan Behrens } 16615eda7b5eSChris Mason 1662cb517eabSMiao Xie root = btrfs_read_fs_root(fs_info->tree_root, location); 16635eda7b5eSChris Mason if (IS_ERR(root)) 16645eda7b5eSChris Mason return root; 16653394e160SChris Mason 1666c00869f1SMiao Xie if (check_ref && btrfs_root_refs(&root->root_item) == 0) { 1667d68fc57bSYan, Zheng ret = -ENOENT; 1668d68fc57bSYan, Zheng goto fail; 1669d68fc57bSYan, Zheng } 1670d68fc57bSYan, Zheng 1671cb517eabSMiao Xie ret = btrfs_init_fs_root(root); 1672cb517eabSMiao Xie if (ret) 1673cb517eabSMiao Xie goto fail; 1674cb517eabSMiao Xie 1675381cf658SDavid Sterba path = btrfs_alloc_path(); 1676381cf658SDavid Sterba if (!path) { 1677381cf658SDavid Sterba ret = -ENOMEM; 1678381cf658SDavid Sterba goto fail; 1679381cf658SDavid Sterba } 16801d4c08e0SDavid Sterba key.objectid = BTRFS_ORPHAN_OBJECTID; 16811d4c08e0SDavid Sterba key.type = BTRFS_ORPHAN_ITEM_KEY; 16821d4c08e0SDavid Sterba key.offset = location->objectid; 16831d4c08e0SDavid Sterba 16841d4c08e0SDavid Sterba ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 1685381cf658SDavid Sterba btrfs_free_path(path); 1686d68fc57bSYan, Zheng if (ret < 0) 1687d68fc57bSYan, Zheng goto fail; 1688d68fc57bSYan, Zheng if (ret == 0) 168927cdeb70SMiao Xie set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state); 1690d68fc57bSYan, Zheng 1691cb517eabSMiao Xie ret = btrfs_insert_fs_root(fs_info, root); 16920f7d52f4SChris Mason if (ret) { 16934df27c4dSYan, Zheng if (ret == -EEXIST) { 16944df27c4dSYan, Zheng free_fs_root(root); 16954df27c4dSYan, Zheng goto again; 16960f7d52f4SChris Mason } 16974df27c4dSYan, Zheng goto fail; 16984df27c4dSYan, Zheng } 1699edbd8d4eSChris Mason return root; 17004df27c4dSYan, Zheng fail: 17014df27c4dSYan, Zheng free_fs_root(root); 17024df27c4dSYan, Zheng return ERR_PTR(ret); 1703edbd8d4eSChris Mason } 1704edbd8d4eSChris Mason 170504160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 170604160088SChris Mason { 170704160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 170804160088SChris Mason int ret = 0; 170904160088SChris Mason struct btrfs_device *device; 171004160088SChris Mason struct backing_dev_info *bdi; 1711b7967db7SChris Mason 17121f78160cSXiao Guangrong rcu_read_lock(); 17131f78160cSXiao Guangrong list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) { 1714dfe25020SChris Mason if (!device->bdev) 1715dfe25020SChris Mason continue; 171604160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 1717ff9ea323STejun Heo if (bdi_congested(bdi, bdi_bits)) { 171804160088SChris Mason ret = 1; 171904160088SChris Mason break; 172004160088SChris Mason } 172104160088SChris Mason } 17221f78160cSXiao Guangrong rcu_read_unlock(); 172304160088SChris Mason return ret; 172404160088SChris Mason } 172504160088SChris Mason 172604160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 172704160088SChris Mason { 1728ad081f14SJens Axboe int err; 1729ad081f14SJens Axboe 1730b4caecd4SChristoph Hellwig err = bdi_setup_and_register(bdi, "btrfs"); 1731ad081f14SJens Axboe if (err) 1732ad081f14SJens Axboe return err; 1733ad081f14SJens Axboe 1734df0ce26cSChristoph Hellwig bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE; 173504160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 173604160088SChris Mason bdi->congested_data = info; 1737da2f0f74SChris Mason bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK; 173804160088SChris Mason return 0; 173904160088SChris Mason } 174004160088SChris Mason 17418b712842SChris Mason /* 17428b712842SChris Mason * called by the kthread helper functions to finally call the bio end_io 17438b712842SChris Mason * functions. This is where read checksum verification actually happens 17448b712842SChris Mason */ 17458b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work) 1746ce9adaa5SChris Mason { 1747ce9adaa5SChris Mason struct bio *bio; 174897eb6b69SDavid Sterba struct btrfs_end_io_wq *end_io_wq; 1749ce9adaa5SChris Mason 175097eb6b69SDavid Sterba end_io_wq = container_of(work, struct btrfs_end_io_wq, work); 1751ce9adaa5SChris Mason bio = end_io_wq->bio; 17528b712842SChris Mason 17534246a0b6SChristoph Hellwig bio->bi_error = end_io_wq->error; 1754ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1755ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 175697eb6b69SDavid Sterba kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq); 17574246a0b6SChristoph Hellwig bio_endio(bio); 1758ce9adaa5SChris Mason } 175944b8bd7eSChris Mason 1760a74a4b97SChris Mason static int cleaner_kthread(void *arg) 1761a74a4b97SChris Mason { 1762a74a4b97SChris Mason struct btrfs_root *root = arg; 1763d0278245SMiao Xie int again; 1764da288d28SFilipe Manana struct btrfs_trans_handle *trans; 1765a74a4b97SChris Mason 1766a74a4b97SChris Mason do { 1767d0278245SMiao Xie again = 0; 17689d1a2a3aSDavid Sterba 1769d0278245SMiao Xie /* Make the cleaner go to sleep early. */ 1770babbf170SMiao Xie if (btrfs_need_cleaner_sleep(root)) 1771d0278245SMiao Xie goto sleep; 1772d0278245SMiao Xie 1773d0278245SMiao Xie if (!mutex_trylock(&root->fs_info->cleaner_mutex)) 1774d0278245SMiao Xie goto sleep; 1775d0278245SMiao Xie 1776dc7f370cSMiao Xie /* 1777dc7f370cSMiao Xie * Avoid the problem that we change the status of the fs 1778dc7f370cSMiao Xie * during the above check and trylock. 1779dc7f370cSMiao Xie */ 1780babbf170SMiao Xie if (btrfs_need_cleaner_sleep(root)) { 1781dc7f370cSMiao Xie mutex_unlock(&root->fs_info->cleaner_mutex); 1782dc7f370cSMiao Xie goto sleep; 1783dc7f370cSMiao Xie } 1784dc7f370cSMiao Xie 178524bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 17869d1a2a3aSDavid Sterba again = btrfs_clean_one_deleted_snapshot(root); 1787a74a4b97SChris Mason mutex_unlock(&root->fs_info->cleaner_mutex); 1788a74a4b97SChris Mason 1789d0278245SMiao Xie /* 179005323cd1SMiao Xie * The defragger has dealt with the R/O remount and umount, 179105323cd1SMiao Xie * needn't do anything special here. 1792d0278245SMiao Xie */ 1793d0278245SMiao Xie btrfs_run_defrag_inodes(root->fs_info); 179467c5e7d4SFilipe Manana 179567c5e7d4SFilipe Manana /* 179667c5e7d4SFilipe Manana * Acquires fs_info->delete_unused_bgs_mutex to avoid racing 179767c5e7d4SFilipe Manana * with relocation (btrfs_relocate_chunk) and relocation 179867c5e7d4SFilipe Manana * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group) 179967c5e7d4SFilipe Manana * after acquiring fs_info->delete_unused_bgs_mutex. So we 180067c5e7d4SFilipe Manana * can't hold, nor need to, fs_info->cleaner_mutex when deleting 180167c5e7d4SFilipe Manana * unused block groups. 180267c5e7d4SFilipe Manana */ 180367c5e7d4SFilipe Manana btrfs_delete_unused_bgs(root->fs_info); 1804d0278245SMiao Xie sleep: 18059d1a2a3aSDavid Sterba if (!try_to_freeze() && !again) { 1806a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 18078929ecfaSYan, Zheng if (!kthread_should_stop()) 1808a74a4b97SChris Mason schedule(); 1809a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1810a74a4b97SChris Mason } 1811a74a4b97SChris Mason } while (!kthread_should_stop()); 1812da288d28SFilipe Manana 1813da288d28SFilipe Manana /* 1814da288d28SFilipe Manana * Transaction kthread is stopped before us and wakes us up. 1815da288d28SFilipe Manana * However we might have started a new transaction and COWed some 1816da288d28SFilipe Manana * tree blocks when deleting unused block groups for example. So 1817da288d28SFilipe Manana * make sure we commit the transaction we started to have a clean 1818da288d28SFilipe Manana * shutdown when evicting the btree inode - if it has dirty pages 1819da288d28SFilipe Manana * when we do the final iput() on it, eviction will trigger a 1820da288d28SFilipe Manana * writeback for it which will fail with null pointer dereferences 1821da288d28SFilipe Manana * since work queues and other resources were already released and 1822da288d28SFilipe Manana * destroyed by the time the iput/eviction/writeback is made. 1823da288d28SFilipe Manana */ 1824da288d28SFilipe Manana trans = btrfs_attach_transaction(root); 1825da288d28SFilipe Manana if (IS_ERR(trans)) { 1826da288d28SFilipe Manana if (PTR_ERR(trans) != -ENOENT) 1827da288d28SFilipe Manana btrfs_err(root->fs_info, 1828da288d28SFilipe Manana "cleaner transaction attach returned %ld", 1829da288d28SFilipe Manana PTR_ERR(trans)); 1830da288d28SFilipe Manana } else { 1831da288d28SFilipe Manana int ret; 1832da288d28SFilipe Manana 1833da288d28SFilipe Manana ret = btrfs_commit_transaction(trans, root); 1834da288d28SFilipe Manana if (ret) 1835da288d28SFilipe Manana btrfs_err(root->fs_info, 1836da288d28SFilipe Manana "cleaner open transaction commit returned %d", 1837da288d28SFilipe Manana ret); 1838da288d28SFilipe Manana } 1839da288d28SFilipe Manana 1840a74a4b97SChris Mason return 0; 1841a74a4b97SChris Mason } 1842a74a4b97SChris Mason 1843a74a4b97SChris Mason static int transaction_kthread(void *arg) 1844a74a4b97SChris Mason { 1845a74a4b97SChris Mason struct btrfs_root *root = arg; 1846a74a4b97SChris Mason struct btrfs_trans_handle *trans; 1847a74a4b97SChris Mason struct btrfs_transaction *cur; 18488929ecfaSYan, Zheng u64 transid; 1849a74a4b97SChris Mason unsigned long now; 1850a74a4b97SChris Mason unsigned long delay; 1851914b2007SJan Kara bool cannot_commit; 1852a74a4b97SChris Mason 1853a74a4b97SChris Mason do { 1854914b2007SJan Kara cannot_commit = false; 18558b87dc17SDavid Sterba delay = HZ * root->fs_info->commit_interval; 1856a74a4b97SChris Mason mutex_lock(&root->fs_info->transaction_kthread_mutex); 1857a74a4b97SChris Mason 1858a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1859a74a4b97SChris Mason cur = root->fs_info->running_transaction; 1860a74a4b97SChris Mason if (!cur) { 1861a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1862a74a4b97SChris Mason goto sleep; 1863a74a4b97SChris Mason } 186431153d81SYan Zheng 1865a74a4b97SChris Mason now = get_seconds(); 18664a9d8bdeSMiao Xie if (cur->state < TRANS_STATE_BLOCKED && 18678b87dc17SDavid Sterba (now < cur->start_time || 18688b87dc17SDavid Sterba now - cur->start_time < root->fs_info->commit_interval)) { 1869a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1870a74a4b97SChris Mason delay = HZ * 5; 1871a74a4b97SChris Mason goto sleep; 1872a74a4b97SChris Mason } 18738929ecfaSYan, Zheng transid = cur->transid; 1874a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 187556bec294SChris Mason 187679787eaaSJeff Mahoney /* If the file system is aborted, this will always fail. */ 1877354aa0fbSMiao Xie trans = btrfs_attach_transaction(root); 1878914b2007SJan Kara if (IS_ERR(trans)) { 1879354aa0fbSMiao Xie if (PTR_ERR(trans) != -ENOENT) 1880914b2007SJan Kara cannot_commit = true; 188179787eaaSJeff Mahoney goto sleep; 1882914b2007SJan Kara } 18838929ecfaSYan, Zheng if (transid == trans->transid) { 188479787eaaSJeff Mahoney btrfs_commit_transaction(trans, root); 18858929ecfaSYan, Zheng } else { 18868929ecfaSYan, Zheng btrfs_end_transaction(trans, root); 18878929ecfaSYan, Zheng } 1888a74a4b97SChris Mason sleep: 1889a74a4b97SChris Mason wake_up_process(root->fs_info->cleaner_kthread); 1890a74a4b97SChris Mason mutex_unlock(&root->fs_info->transaction_kthread_mutex); 1891a74a4b97SChris Mason 18924e121c06SJosef Bacik if (unlikely(test_bit(BTRFS_FS_STATE_ERROR, 18934e121c06SJosef Bacik &root->fs_info->fs_state))) 18944e121c06SJosef Bacik btrfs_cleanup_transaction(root); 1895a0acae0eSTejun Heo if (!try_to_freeze()) { 1896a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 18978929ecfaSYan, Zheng if (!kthread_should_stop() && 1898914b2007SJan Kara (!btrfs_transaction_blocked(root->fs_info) || 1899914b2007SJan Kara cannot_commit)) 1900a74a4b97SChris Mason schedule_timeout(delay); 1901a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1902a74a4b97SChris Mason } 1903a74a4b97SChris Mason } while (!kthread_should_stop()); 1904a74a4b97SChris Mason return 0; 1905a74a4b97SChris Mason } 1906a74a4b97SChris Mason 1907af31f5e5SChris Mason /* 1908af31f5e5SChris Mason * this will find the highest generation in the array of 1909af31f5e5SChris Mason * root backups. The index of the highest array is returned, 1910af31f5e5SChris Mason * or -1 if we can't find anything. 1911af31f5e5SChris Mason * 1912af31f5e5SChris Mason * We check to make sure the array is valid by comparing the 1913af31f5e5SChris Mason * generation of the latest root in the array with the generation 1914af31f5e5SChris Mason * in the super block. If they don't match we pitch it. 1915af31f5e5SChris Mason */ 1916af31f5e5SChris Mason static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen) 1917af31f5e5SChris Mason { 1918af31f5e5SChris Mason u64 cur; 1919af31f5e5SChris Mason int newest_index = -1; 1920af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1921af31f5e5SChris Mason int i; 1922af31f5e5SChris Mason 1923af31f5e5SChris Mason for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { 1924af31f5e5SChris Mason root_backup = info->super_copy->super_roots + i; 1925af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1926af31f5e5SChris Mason if (cur == newest_gen) 1927af31f5e5SChris Mason newest_index = i; 1928af31f5e5SChris Mason } 1929af31f5e5SChris Mason 1930af31f5e5SChris Mason /* check to see if we actually wrapped around */ 1931af31f5e5SChris Mason if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) { 1932af31f5e5SChris Mason root_backup = info->super_copy->super_roots; 1933af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1934af31f5e5SChris Mason if (cur == newest_gen) 1935af31f5e5SChris Mason newest_index = 0; 1936af31f5e5SChris Mason } 1937af31f5e5SChris Mason return newest_index; 1938af31f5e5SChris Mason } 1939af31f5e5SChris Mason 1940af31f5e5SChris Mason 1941af31f5e5SChris Mason /* 1942af31f5e5SChris Mason * find the oldest backup so we know where to store new entries 1943af31f5e5SChris Mason * in the backup array. This will set the backup_root_index 1944af31f5e5SChris Mason * field in the fs_info struct 1945af31f5e5SChris Mason */ 1946af31f5e5SChris Mason static void find_oldest_super_backup(struct btrfs_fs_info *info, 1947af31f5e5SChris Mason u64 newest_gen) 1948af31f5e5SChris Mason { 1949af31f5e5SChris Mason int newest_index = -1; 1950af31f5e5SChris Mason 1951af31f5e5SChris Mason newest_index = find_newest_super_backup(info, newest_gen); 1952af31f5e5SChris Mason /* if there was garbage in there, just move along */ 1953af31f5e5SChris Mason if (newest_index == -1) { 1954af31f5e5SChris Mason info->backup_root_index = 0; 1955af31f5e5SChris Mason } else { 1956af31f5e5SChris Mason info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS; 1957af31f5e5SChris Mason } 1958af31f5e5SChris Mason } 1959af31f5e5SChris Mason 1960af31f5e5SChris Mason /* 1961af31f5e5SChris Mason * copy all the root pointers into the super backup array. 1962af31f5e5SChris Mason * this will bump the backup pointer by one when it is 1963af31f5e5SChris Mason * done 1964af31f5e5SChris Mason */ 1965af31f5e5SChris Mason static void backup_super_roots(struct btrfs_fs_info *info) 1966af31f5e5SChris Mason { 1967af31f5e5SChris Mason int next_backup; 1968af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1969af31f5e5SChris Mason int last_backup; 1970af31f5e5SChris Mason 1971af31f5e5SChris Mason next_backup = info->backup_root_index; 1972af31f5e5SChris Mason last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) % 1973af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 1974af31f5e5SChris Mason 1975af31f5e5SChris Mason /* 1976af31f5e5SChris Mason * just overwrite the last backup if we're at the same generation 1977af31f5e5SChris Mason * this happens only at umount 1978af31f5e5SChris Mason */ 1979af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + last_backup; 1980af31f5e5SChris Mason if (btrfs_backup_tree_root_gen(root_backup) == 1981af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)) 1982af31f5e5SChris Mason next_backup = last_backup; 1983af31f5e5SChris Mason 1984af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + next_backup; 1985af31f5e5SChris Mason 1986af31f5e5SChris Mason /* 1987af31f5e5SChris Mason * make sure all of our padding and empty slots get zero filled 1988af31f5e5SChris Mason * regardless of which ones we use today 1989af31f5e5SChris Mason */ 1990af31f5e5SChris Mason memset(root_backup, 0, sizeof(*root_backup)); 1991af31f5e5SChris Mason 1992af31f5e5SChris Mason info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS; 1993af31f5e5SChris Mason 1994af31f5e5SChris Mason btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start); 1995af31f5e5SChris Mason btrfs_set_backup_tree_root_gen(root_backup, 1996af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)); 1997af31f5e5SChris Mason 1998af31f5e5SChris Mason btrfs_set_backup_tree_root_level(root_backup, 1999af31f5e5SChris Mason btrfs_header_level(info->tree_root->node)); 2000af31f5e5SChris Mason 2001af31f5e5SChris Mason btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start); 2002af31f5e5SChris Mason btrfs_set_backup_chunk_root_gen(root_backup, 2003af31f5e5SChris Mason btrfs_header_generation(info->chunk_root->node)); 2004af31f5e5SChris Mason btrfs_set_backup_chunk_root_level(root_backup, 2005af31f5e5SChris Mason btrfs_header_level(info->chunk_root->node)); 2006af31f5e5SChris Mason 2007af31f5e5SChris Mason btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start); 2008af31f5e5SChris Mason btrfs_set_backup_extent_root_gen(root_backup, 2009af31f5e5SChris Mason btrfs_header_generation(info->extent_root->node)); 2010af31f5e5SChris Mason btrfs_set_backup_extent_root_level(root_backup, 2011af31f5e5SChris Mason btrfs_header_level(info->extent_root->node)); 2012af31f5e5SChris Mason 20137c7e82a7SChris Mason /* 20147c7e82a7SChris Mason * we might commit during log recovery, which happens before we set 20157c7e82a7SChris Mason * the fs_root. Make sure it is valid before we fill it in. 20167c7e82a7SChris Mason */ 20177c7e82a7SChris Mason if (info->fs_root && info->fs_root->node) { 20187c7e82a7SChris Mason btrfs_set_backup_fs_root(root_backup, 20197c7e82a7SChris Mason info->fs_root->node->start); 2020af31f5e5SChris Mason btrfs_set_backup_fs_root_gen(root_backup, 2021af31f5e5SChris Mason btrfs_header_generation(info->fs_root->node)); 2022af31f5e5SChris Mason btrfs_set_backup_fs_root_level(root_backup, 2023af31f5e5SChris Mason btrfs_header_level(info->fs_root->node)); 20247c7e82a7SChris Mason } 2025af31f5e5SChris Mason 2026af31f5e5SChris Mason btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start); 2027af31f5e5SChris Mason btrfs_set_backup_dev_root_gen(root_backup, 2028af31f5e5SChris Mason btrfs_header_generation(info->dev_root->node)); 2029af31f5e5SChris Mason btrfs_set_backup_dev_root_level(root_backup, 2030af31f5e5SChris Mason btrfs_header_level(info->dev_root->node)); 2031af31f5e5SChris Mason 2032af31f5e5SChris Mason btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start); 2033af31f5e5SChris Mason btrfs_set_backup_csum_root_gen(root_backup, 2034af31f5e5SChris Mason btrfs_header_generation(info->csum_root->node)); 2035af31f5e5SChris Mason btrfs_set_backup_csum_root_level(root_backup, 2036af31f5e5SChris Mason btrfs_header_level(info->csum_root->node)); 2037af31f5e5SChris Mason 2038af31f5e5SChris Mason btrfs_set_backup_total_bytes(root_backup, 2039af31f5e5SChris Mason btrfs_super_total_bytes(info->super_copy)); 2040af31f5e5SChris Mason btrfs_set_backup_bytes_used(root_backup, 2041af31f5e5SChris Mason btrfs_super_bytes_used(info->super_copy)); 2042af31f5e5SChris Mason btrfs_set_backup_num_devices(root_backup, 2043af31f5e5SChris Mason btrfs_super_num_devices(info->super_copy)); 2044af31f5e5SChris Mason 2045af31f5e5SChris Mason /* 2046af31f5e5SChris Mason * if we don't copy this out to the super_copy, it won't get remembered 2047af31f5e5SChris Mason * for the next commit 2048af31f5e5SChris Mason */ 2049af31f5e5SChris Mason memcpy(&info->super_copy->super_roots, 2050af31f5e5SChris Mason &info->super_for_commit->super_roots, 2051af31f5e5SChris Mason sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS); 2052af31f5e5SChris Mason } 2053af31f5e5SChris Mason 2054af31f5e5SChris Mason /* 2055af31f5e5SChris Mason * this copies info out of the root backup array and back into 2056af31f5e5SChris Mason * the in-memory super block. It is meant to help iterate through 2057af31f5e5SChris Mason * the array, so you send it the number of backups you've already 2058af31f5e5SChris Mason * tried and the last backup index you used. 2059af31f5e5SChris Mason * 2060af31f5e5SChris Mason * this returns -1 when it has tried all the backups 2061af31f5e5SChris Mason */ 2062af31f5e5SChris Mason static noinline int next_root_backup(struct btrfs_fs_info *info, 2063af31f5e5SChris Mason struct btrfs_super_block *super, 2064af31f5e5SChris Mason int *num_backups_tried, int *backup_index) 2065af31f5e5SChris Mason { 2066af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 2067af31f5e5SChris Mason int newest = *backup_index; 2068af31f5e5SChris Mason 2069af31f5e5SChris Mason if (*num_backups_tried == 0) { 2070af31f5e5SChris Mason u64 gen = btrfs_super_generation(super); 2071af31f5e5SChris Mason 2072af31f5e5SChris Mason newest = find_newest_super_backup(info, gen); 2073af31f5e5SChris Mason if (newest == -1) 2074af31f5e5SChris Mason return -1; 2075af31f5e5SChris Mason 2076af31f5e5SChris Mason *backup_index = newest; 2077af31f5e5SChris Mason *num_backups_tried = 1; 2078af31f5e5SChris Mason } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) { 2079af31f5e5SChris Mason /* we've tried all the backups, all done */ 2080af31f5e5SChris Mason return -1; 2081af31f5e5SChris Mason } else { 2082af31f5e5SChris Mason /* jump to the next oldest backup */ 2083af31f5e5SChris Mason newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) % 2084af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 2085af31f5e5SChris Mason *backup_index = newest; 2086af31f5e5SChris Mason *num_backups_tried += 1; 2087af31f5e5SChris Mason } 2088af31f5e5SChris Mason root_backup = super->super_roots + newest; 2089af31f5e5SChris Mason 2090af31f5e5SChris Mason btrfs_set_super_generation(super, 2091af31f5e5SChris Mason btrfs_backup_tree_root_gen(root_backup)); 2092af31f5e5SChris Mason btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup)); 2093af31f5e5SChris Mason btrfs_set_super_root_level(super, 2094af31f5e5SChris Mason btrfs_backup_tree_root_level(root_backup)); 2095af31f5e5SChris Mason btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup)); 2096af31f5e5SChris Mason 2097af31f5e5SChris Mason /* 2098af31f5e5SChris Mason * fixme: the total bytes and num_devices need to match or we should 2099af31f5e5SChris Mason * need a fsck 2100af31f5e5SChris Mason */ 2101af31f5e5SChris Mason btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup)); 2102af31f5e5SChris Mason btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup)); 2103af31f5e5SChris Mason return 0; 2104af31f5e5SChris Mason } 2105af31f5e5SChris Mason 21067abadb64SLiu Bo /* helper to cleanup workers */ 21077abadb64SLiu Bo static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info) 21087abadb64SLiu Bo { 2109dc6e3209SQu Wenruo btrfs_destroy_workqueue(fs_info->fixup_workers); 2110afe3d242SQu Wenruo btrfs_destroy_workqueue(fs_info->delalloc_workers); 21115cdc7ad3SQu Wenruo btrfs_destroy_workqueue(fs_info->workers); 2112fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_workers); 2113fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_meta_workers); 2114fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_raid56_workers); 21158b110e39SMiao Xie btrfs_destroy_workqueue(fs_info->endio_repair_workers); 2116d05a33acSQu Wenruo btrfs_destroy_workqueue(fs_info->rmw_workers); 2117fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_meta_write_workers); 2118fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_write_workers); 2119fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_freespace_worker); 2120a8c93d4eSQu Wenruo btrfs_destroy_workqueue(fs_info->submit_workers); 21215b3bc44eSQu Wenruo btrfs_destroy_workqueue(fs_info->delayed_workers); 2122e66f0bb1SQu Wenruo btrfs_destroy_workqueue(fs_info->caching_workers); 2123736cfa15SQu Wenruo btrfs_destroy_workqueue(fs_info->readahead_workers); 2124a44903abSQu Wenruo btrfs_destroy_workqueue(fs_info->flush_workers); 2125fc97fab0SQu Wenruo btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers); 2126a79b7d4bSChris Mason btrfs_destroy_workqueue(fs_info->extent_workers); 21277abadb64SLiu Bo } 21287abadb64SLiu Bo 21292e9f5954SRashika static void free_root_extent_buffers(struct btrfs_root *root) 21302e9f5954SRashika { 21312e9f5954SRashika if (root) { 21322e9f5954SRashika free_extent_buffer(root->node); 21332e9f5954SRashika free_extent_buffer(root->commit_root); 21342e9f5954SRashika root->node = NULL; 21352e9f5954SRashika root->commit_root = NULL; 21362e9f5954SRashika } 21372e9f5954SRashika } 21382e9f5954SRashika 2139af31f5e5SChris Mason /* helper to cleanup tree roots */ 2140af31f5e5SChris Mason static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root) 2141af31f5e5SChris Mason { 21422e9f5954SRashika free_root_extent_buffers(info->tree_root); 2143655b09feSJosef Bacik 21442e9f5954SRashika free_root_extent_buffers(info->dev_root); 21452e9f5954SRashika free_root_extent_buffers(info->extent_root); 21462e9f5954SRashika free_root_extent_buffers(info->csum_root); 21472e9f5954SRashika free_root_extent_buffers(info->quota_root); 21482e9f5954SRashika free_root_extent_buffers(info->uuid_root); 21492e9f5954SRashika if (chunk_root) 21502e9f5954SRashika free_root_extent_buffers(info->chunk_root); 215170f6d82eSOmar Sandoval free_root_extent_buffers(info->free_space_root); 2152af31f5e5SChris Mason } 2153af31f5e5SChris Mason 2154faa2dbf0SJosef Bacik void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info) 2155171f6537SJosef Bacik { 2156171f6537SJosef Bacik int ret; 2157171f6537SJosef Bacik struct btrfs_root *gang[8]; 2158171f6537SJosef Bacik int i; 2159171f6537SJosef Bacik 2160171f6537SJosef Bacik while (!list_empty(&fs_info->dead_roots)) { 2161171f6537SJosef Bacik gang[0] = list_entry(fs_info->dead_roots.next, 2162171f6537SJosef Bacik struct btrfs_root, root_list); 2163171f6537SJosef Bacik list_del(&gang[0]->root_list); 2164171f6537SJosef Bacik 216527cdeb70SMiao Xie if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) { 2166cb517eabSMiao Xie btrfs_drop_and_free_fs_root(fs_info, gang[0]); 2167171f6537SJosef Bacik } else { 2168171f6537SJosef Bacik free_extent_buffer(gang[0]->node); 2169171f6537SJosef Bacik free_extent_buffer(gang[0]->commit_root); 2170b0feb9d9SMiao Xie btrfs_put_fs_root(gang[0]); 2171171f6537SJosef Bacik } 2172171f6537SJosef Bacik } 2173171f6537SJosef Bacik 2174171f6537SJosef Bacik while (1) { 2175171f6537SJosef Bacik ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 2176171f6537SJosef Bacik (void **)gang, 0, 2177171f6537SJosef Bacik ARRAY_SIZE(gang)); 2178171f6537SJosef Bacik if (!ret) 2179171f6537SJosef Bacik break; 2180171f6537SJosef Bacik for (i = 0; i < ret; i++) 2181cb517eabSMiao Xie btrfs_drop_and_free_fs_root(fs_info, gang[i]); 2182171f6537SJosef Bacik } 21831a4319ccSLiu Bo 21841a4319ccSLiu Bo if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 21851a4319ccSLiu Bo btrfs_free_log_root_tree(NULL, fs_info); 21861a4319ccSLiu Bo btrfs_destroy_pinned_extent(fs_info->tree_root, 21871a4319ccSLiu Bo fs_info->pinned_extents); 21881a4319ccSLiu Bo } 2189171f6537SJosef Bacik } 2190af31f5e5SChris Mason 2191638aa7edSEric Sandeen static void btrfs_init_scrub(struct btrfs_fs_info *fs_info) 2192638aa7edSEric Sandeen { 2193638aa7edSEric Sandeen mutex_init(&fs_info->scrub_lock); 2194638aa7edSEric Sandeen atomic_set(&fs_info->scrubs_running, 0); 2195638aa7edSEric Sandeen atomic_set(&fs_info->scrub_pause_req, 0); 2196638aa7edSEric Sandeen atomic_set(&fs_info->scrubs_paused, 0); 2197638aa7edSEric Sandeen atomic_set(&fs_info->scrub_cancel_req, 0); 2198638aa7edSEric Sandeen init_waitqueue_head(&fs_info->scrub_pause_wait); 2199638aa7edSEric Sandeen fs_info->scrub_workers_refcnt = 0; 2200638aa7edSEric Sandeen } 2201638aa7edSEric Sandeen 2202779a65a4SEric Sandeen static void btrfs_init_balance(struct btrfs_fs_info *fs_info) 2203779a65a4SEric Sandeen { 2204779a65a4SEric Sandeen spin_lock_init(&fs_info->balance_lock); 2205779a65a4SEric Sandeen mutex_init(&fs_info->balance_mutex); 2206779a65a4SEric Sandeen atomic_set(&fs_info->balance_running, 0); 2207779a65a4SEric Sandeen atomic_set(&fs_info->balance_pause_req, 0); 2208779a65a4SEric Sandeen atomic_set(&fs_info->balance_cancel_req, 0); 2209779a65a4SEric Sandeen fs_info->balance_ctl = NULL; 2210779a65a4SEric Sandeen init_waitqueue_head(&fs_info->balance_wait_q); 2211779a65a4SEric Sandeen } 2212779a65a4SEric Sandeen 2213f37938e0SEric Sandeen static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info, 2214f37938e0SEric Sandeen struct btrfs_root *tree_root) 2215f37938e0SEric Sandeen { 2216f37938e0SEric Sandeen fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; 2217f37938e0SEric Sandeen set_nlink(fs_info->btree_inode, 1); 2218f37938e0SEric Sandeen /* 2219f37938e0SEric Sandeen * we set the i_size on the btree inode to the max possible int. 2220f37938e0SEric Sandeen * the real end of the address space is determined by all of 2221f37938e0SEric Sandeen * the devices in the system 2222f37938e0SEric Sandeen */ 2223f37938e0SEric Sandeen fs_info->btree_inode->i_size = OFFSET_MAX; 2224f37938e0SEric Sandeen fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 2225f37938e0SEric Sandeen 2226f37938e0SEric Sandeen RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); 2227f37938e0SEric Sandeen extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 2228f37938e0SEric Sandeen fs_info->btree_inode->i_mapping); 2229f37938e0SEric Sandeen BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0; 2230f37938e0SEric Sandeen extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree); 2231f37938e0SEric Sandeen 2232f37938e0SEric Sandeen BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 2233f37938e0SEric Sandeen 2234f37938e0SEric Sandeen BTRFS_I(fs_info->btree_inode)->root = tree_root; 2235f37938e0SEric Sandeen memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 2236f37938e0SEric Sandeen sizeof(struct btrfs_key)); 2237f37938e0SEric Sandeen set_bit(BTRFS_INODE_DUMMY, 2238f37938e0SEric Sandeen &BTRFS_I(fs_info->btree_inode)->runtime_flags); 2239f37938e0SEric Sandeen btrfs_insert_inode_hash(fs_info->btree_inode); 2240f37938e0SEric Sandeen } 2241f37938e0SEric Sandeen 2242ad618368SEric Sandeen static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info) 2243ad618368SEric Sandeen { 2244ad618368SEric Sandeen fs_info->dev_replace.lock_owner = 0; 2245ad618368SEric Sandeen atomic_set(&fs_info->dev_replace.nesting_level, 0); 2246ad618368SEric Sandeen mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount); 2247ad618368SEric Sandeen mutex_init(&fs_info->dev_replace.lock_management_lock); 2248ad618368SEric Sandeen mutex_init(&fs_info->dev_replace.lock); 2249ad618368SEric Sandeen init_waitqueue_head(&fs_info->replace_wait); 2250ad618368SEric Sandeen } 2251ad618368SEric Sandeen 2252f9e92e40SEric Sandeen static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info) 2253f9e92e40SEric Sandeen { 2254f9e92e40SEric Sandeen spin_lock_init(&fs_info->qgroup_lock); 2255f9e92e40SEric Sandeen mutex_init(&fs_info->qgroup_ioctl_lock); 2256f9e92e40SEric Sandeen fs_info->qgroup_tree = RB_ROOT; 2257f9e92e40SEric Sandeen fs_info->qgroup_op_tree = RB_ROOT; 2258f9e92e40SEric Sandeen INIT_LIST_HEAD(&fs_info->dirty_qgroups); 2259f9e92e40SEric Sandeen fs_info->qgroup_seq = 1; 2260f9e92e40SEric Sandeen fs_info->quota_enabled = 0; 2261f9e92e40SEric Sandeen fs_info->pending_quota_state = 0; 2262f9e92e40SEric Sandeen fs_info->qgroup_ulist = NULL; 2263f9e92e40SEric Sandeen mutex_init(&fs_info->qgroup_rescan_lock); 2264f9e92e40SEric Sandeen } 2265f9e92e40SEric Sandeen 22662a458198SEric Sandeen static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info, 22672a458198SEric Sandeen struct btrfs_fs_devices *fs_devices) 22682a458198SEric Sandeen { 22692a458198SEric Sandeen int max_active = fs_info->thread_pool_size; 22706f011058SDavid Sterba unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND; 22712a458198SEric Sandeen 22722a458198SEric Sandeen fs_info->workers = 22732a458198SEric Sandeen btrfs_alloc_workqueue("worker", flags | WQ_HIGHPRI, 22742a458198SEric Sandeen max_active, 16); 22752a458198SEric Sandeen 22762a458198SEric Sandeen fs_info->delalloc_workers = 22772a458198SEric Sandeen btrfs_alloc_workqueue("delalloc", flags, max_active, 2); 22782a458198SEric Sandeen 22792a458198SEric Sandeen fs_info->flush_workers = 22802a458198SEric Sandeen btrfs_alloc_workqueue("flush_delalloc", flags, max_active, 0); 22812a458198SEric Sandeen 22822a458198SEric Sandeen fs_info->caching_workers = 22832a458198SEric Sandeen btrfs_alloc_workqueue("cache", flags, max_active, 0); 22842a458198SEric Sandeen 22852a458198SEric Sandeen /* 22862a458198SEric Sandeen * a higher idle thresh on the submit workers makes it much more 22872a458198SEric Sandeen * likely that bios will be send down in a sane order to the 22882a458198SEric Sandeen * devices 22892a458198SEric Sandeen */ 22902a458198SEric Sandeen fs_info->submit_workers = 22912a458198SEric Sandeen btrfs_alloc_workqueue("submit", flags, 22922a458198SEric Sandeen min_t(u64, fs_devices->num_devices, 22932a458198SEric Sandeen max_active), 64); 22942a458198SEric Sandeen 22952a458198SEric Sandeen fs_info->fixup_workers = 22962a458198SEric Sandeen btrfs_alloc_workqueue("fixup", flags, 1, 0); 22972a458198SEric Sandeen 22982a458198SEric Sandeen /* 22992a458198SEric Sandeen * endios are largely parallel and should have a very 23002a458198SEric Sandeen * low idle thresh 23012a458198SEric Sandeen */ 23022a458198SEric Sandeen fs_info->endio_workers = 23032a458198SEric Sandeen btrfs_alloc_workqueue("endio", flags, max_active, 4); 23042a458198SEric Sandeen fs_info->endio_meta_workers = 23052a458198SEric Sandeen btrfs_alloc_workqueue("endio-meta", flags, max_active, 4); 23062a458198SEric Sandeen fs_info->endio_meta_write_workers = 23072a458198SEric Sandeen btrfs_alloc_workqueue("endio-meta-write", flags, max_active, 2); 23082a458198SEric Sandeen fs_info->endio_raid56_workers = 23092a458198SEric Sandeen btrfs_alloc_workqueue("endio-raid56", flags, max_active, 4); 23102a458198SEric Sandeen fs_info->endio_repair_workers = 23112a458198SEric Sandeen btrfs_alloc_workqueue("endio-repair", flags, 1, 0); 23122a458198SEric Sandeen fs_info->rmw_workers = 23132a458198SEric Sandeen btrfs_alloc_workqueue("rmw", flags, max_active, 2); 23142a458198SEric Sandeen fs_info->endio_write_workers = 23152a458198SEric Sandeen btrfs_alloc_workqueue("endio-write", flags, max_active, 2); 23162a458198SEric Sandeen fs_info->endio_freespace_worker = 23172a458198SEric Sandeen btrfs_alloc_workqueue("freespace-write", flags, max_active, 0); 23182a458198SEric Sandeen fs_info->delayed_workers = 23192a458198SEric Sandeen btrfs_alloc_workqueue("delayed-meta", flags, max_active, 0); 23202a458198SEric Sandeen fs_info->readahead_workers = 23212a458198SEric Sandeen btrfs_alloc_workqueue("readahead", flags, max_active, 2); 23222a458198SEric Sandeen fs_info->qgroup_rescan_workers = 23232a458198SEric Sandeen btrfs_alloc_workqueue("qgroup-rescan", flags, 1, 0); 23242a458198SEric Sandeen fs_info->extent_workers = 23252a458198SEric Sandeen btrfs_alloc_workqueue("extent-refs", flags, 23262a458198SEric Sandeen min_t(u64, fs_devices->num_devices, 23272a458198SEric Sandeen max_active), 8); 23282a458198SEric Sandeen 23292a458198SEric Sandeen if (!(fs_info->workers && fs_info->delalloc_workers && 23302a458198SEric Sandeen fs_info->submit_workers && fs_info->flush_workers && 23312a458198SEric Sandeen fs_info->endio_workers && fs_info->endio_meta_workers && 23322a458198SEric Sandeen fs_info->endio_meta_write_workers && 23332a458198SEric Sandeen fs_info->endio_repair_workers && 23342a458198SEric Sandeen fs_info->endio_write_workers && fs_info->endio_raid56_workers && 23352a458198SEric Sandeen fs_info->endio_freespace_worker && fs_info->rmw_workers && 23362a458198SEric Sandeen fs_info->caching_workers && fs_info->readahead_workers && 23372a458198SEric Sandeen fs_info->fixup_workers && fs_info->delayed_workers && 23382a458198SEric Sandeen fs_info->extent_workers && 23392a458198SEric Sandeen fs_info->qgroup_rescan_workers)) { 23402a458198SEric Sandeen return -ENOMEM; 23412a458198SEric Sandeen } 23422a458198SEric Sandeen 23432a458198SEric Sandeen return 0; 23442a458198SEric Sandeen } 23452a458198SEric Sandeen 234663443bf5SEric Sandeen static int btrfs_replay_log(struct btrfs_fs_info *fs_info, 234763443bf5SEric Sandeen struct btrfs_fs_devices *fs_devices) 234863443bf5SEric Sandeen { 234963443bf5SEric Sandeen int ret; 235063443bf5SEric Sandeen struct btrfs_root *tree_root = fs_info->tree_root; 235163443bf5SEric Sandeen struct btrfs_root *log_tree_root; 235263443bf5SEric Sandeen struct btrfs_super_block *disk_super = fs_info->super_copy; 235363443bf5SEric Sandeen u64 bytenr = btrfs_super_log_root(disk_super); 235463443bf5SEric Sandeen 235563443bf5SEric Sandeen if (fs_devices->rw_devices == 0) { 235663443bf5SEric Sandeen printk(KERN_WARNING "BTRFS: log replay required " 235763443bf5SEric Sandeen "on RO media\n"); 235863443bf5SEric Sandeen return -EIO; 235963443bf5SEric Sandeen } 236063443bf5SEric Sandeen 236163443bf5SEric Sandeen log_tree_root = btrfs_alloc_root(fs_info); 236263443bf5SEric Sandeen if (!log_tree_root) 236363443bf5SEric Sandeen return -ENOMEM; 236463443bf5SEric Sandeen 236563443bf5SEric Sandeen __setup_root(tree_root->nodesize, tree_root->sectorsize, 236663443bf5SEric Sandeen tree_root->stripesize, log_tree_root, fs_info, 236763443bf5SEric Sandeen BTRFS_TREE_LOG_OBJECTID); 236863443bf5SEric Sandeen 236963443bf5SEric Sandeen log_tree_root->node = read_tree_block(tree_root, bytenr, 237063443bf5SEric Sandeen fs_info->generation + 1); 237164c043deSLiu Bo if (IS_ERR(log_tree_root->node)) { 237264c043deSLiu Bo printk(KERN_ERR "BTRFS: failed to read log tree\n"); 23730eeff236SLiu Bo ret = PTR_ERR(log_tree_root->node); 237464c043deSLiu Bo kfree(log_tree_root); 23750eeff236SLiu Bo return ret; 237664c043deSLiu Bo } else if (!extent_buffer_uptodate(log_tree_root->node)) { 237763443bf5SEric Sandeen printk(KERN_ERR "BTRFS: failed to read log tree\n"); 237863443bf5SEric Sandeen free_extent_buffer(log_tree_root->node); 237963443bf5SEric Sandeen kfree(log_tree_root); 238063443bf5SEric Sandeen return -EIO; 238163443bf5SEric Sandeen } 238263443bf5SEric Sandeen /* returns with log_tree_root freed on success */ 238363443bf5SEric Sandeen ret = btrfs_recover_log_trees(log_tree_root); 238463443bf5SEric Sandeen if (ret) { 238563443bf5SEric Sandeen btrfs_error(tree_root->fs_info, ret, 238663443bf5SEric Sandeen "Failed to recover log tree"); 238763443bf5SEric Sandeen free_extent_buffer(log_tree_root->node); 238863443bf5SEric Sandeen kfree(log_tree_root); 238963443bf5SEric Sandeen return ret; 239063443bf5SEric Sandeen } 239163443bf5SEric Sandeen 239263443bf5SEric Sandeen if (fs_info->sb->s_flags & MS_RDONLY) { 239363443bf5SEric Sandeen ret = btrfs_commit_super(tree_root); 239463443bf5SEric Sandeen if (ret) 239563443bf5SEric Sandeen return ret; 239663443bf5SEric Sandeen } 239763443bf5SEric Sandeen 239863443bf5SEric Sandeen return 0; 239963443bf5SEric Sandeen } 240063443bf5SEric Sandeen 24014bbcaa64SEric Sandeen static int btrfs_read_roots(struct btrfs_fs_info *fs_info, 24024bbcaa64SEric Sandeen struct btrfs_root *tree_root) 24034bbcaa64SEric Sandeen { 2404a4f3d2c4SDavid Sterba struct btrfs_root *root; 24054bbcaa64SEric Sandeen struct btrfs_key location; 24064bbcaa64SEric Sandeen int ret; 24074bbcaa64SEric Sandeen 24084bbcaa64SEric Sandeen location.objectid = BTRFS_EXTENT_TREE_OBJECTID; 24094bbcaa64SEric Sandeen location.type = BTRFS_ROOT_ITEM_KEY; 24104bbcaa64SEric Sandeen location.offset = 0; 24114bbcaa64SEric Sandeen 2412a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2413a4f3d2c4SDavid Sterba if (IS_ERR(root)) 2414a4f3d2c4SDavid Sterba return PTR_ERR(root); 2415a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 2416a4f3d2c4SDavid Sterba fs_info->extent_root = root; 24174bbcaa64SEric Sandeen 24184bbcaa64SEric Sandeen location.objectid = BTRFS_DEV_TREE_OBJECTID; 2419a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2420a4f3d2c4SDavid Sterba if (IS_ERR(root)) 2421a4f3d2c4SDavid Sterba return PTR_ERR(root); 2422a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 2423a4f3d2c4SDavid Sterba fs_info->dev_root = root; 24244bbcaa64SEric Sandeen btrfs_init_devices_late(fs_info); 24254bbcaa64SEric Sandeen 24264bbcaa64SEric Sandeen location.objectid = BTRFS_CSUM_TREE_OBJECTID; 2427a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2428a4f3d2c4SDavid Sterba if (IS_ERR(root)) 2429a4f3d2c4SDavid Sterba return PTR_ERR(root); 2430a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 2431a4f3d2c4SDavid Sterba fs_info->csum_root = root; 24324bbcaa64SEric Sandeen 24334bbcaa64SEric Sandeen location.objectid = BTRFS_QUOTA_TREE_OBJECTID; 2434a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2435a4f3d2c4SDavid Sterba if (!IS_ERR(root)) { 2436a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 24374bbcaa64SEric Sandeen fs_info->quota_enabled = 1; 24384bbcaa64SEric Sandeen fs_info->pending_quota_state = 1; 2439a4f3d2c4SDavid Sterba fs_info->quota_root = root; 24404bbcaa64SEric Sandeen } 24414bbcaa64SEric Sandeen 24424bbcaa64SEric Sandeen location.objectid = BTRFS_UUID_TREE_OBJECTID; 2443a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2444a4f3d2c4SDavid Sterba if (IS_ERR(root)) { 2445a4f3d2c4SDavid Sterba ret = PTR_ERR(root); 24464bbcaa64SEric Sandeen if (ret != -ENOENT) 24474bbcaa64SEric Sandeen return ret; 24484bbcaa64SEric Sandeen } else { 2449a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 2450a4f3d2c4SDavid Sterba fs_info->uuid_root = root; 24514bbcaa64SEric Sandeen } 24524bbcaa64SEric Sandeen 245370f6d82eSOmar Sandoval if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { 245470f6d82eSOmar Sandoval location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID; 245570f6d82eSOmar Sandoval root = btrfs_read_tree_root(tree_root, &location); 245670f6d82eSOmar Sandoval if (IS_ERR(root)) 245770f6d82eSOmar Sandoval return PTR_ERR(root); 245870f6d82eSOmar Sandoval set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 245970f6d82eSOmar Sandoval fs_info->free_space_root = root; 246070f6d82eSOmar Sandoval } 246170f6d82eSOmar Sandoval 24624bbcaa64SEric Sandeen return 0; 24634bbcaa64SEric Sandeen } 24644bbcaa64SEric Sandeen 2465ad2b2c80SAl Viro int open_ctree(struct super_block *sb, 2466dfe25020SChris Mason struct btrfs_fs_devices *fs_devices, 2467dfe25020SChris Mason char *options) 2468eb60ceacSChris Mason { 2469db94535dSChris Mason u32 sectorsize; 2470db94535dSChris Mason u32 nodesize; 247187ee04ebSChris Mason u32 stripesize; 247284234f3aSYan Zheng u64 generation; 2473f2b636e8SJosef Bacik u64 features; 24743de4586cSChris Mason struct btrfs_key location; 2475a061fc8dSChris Mason struct buffer_head *bh; 24764d34b278SIlya Dryomov struct btrfs_super_block *disk_super; 2477815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2478f84a8bd6SAl Viro struct btrfs_root *tree_root; 24794d34b278SIlya Dryomov struct btrfs_root *chunk_root; 2480eb60ceacSChris Mason int ret; 2481e58ca020SYan int err = -EINVAL; 2482af31f5e5SChris Mason int num_backups_tried = 0; 2483af31f5e5SChris Mason int backup_index = 0; 24845cdc7ad3SQu Wenruo int max_active; 24854543df7eSChris Mason 2486f84a8bd6SAl Viro tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info); 24876f07e42eSAl Viro chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info); 2488cb517eabSMiao Xie if (!tree_root || !chunk_root) { 248939279cc3SChris Mason err = -ENOMEM; 249039279cc3SChris Mason goto fail; 249139279cc3SChris Mason } 249276dda93cSYan, Zheng 249376dda93cSYan, Zheng ret = init_srcu_struct(&fs_info->subvol_srcu); 249476dda93cSYan, Zheng if (ret) { 249576dda93cSYan, Zheng err = ret; 249676dda93cSYan, Zheng goto fail; 249776dda93cSYan, Zheng } 249876dda93cSYan, Zheng 249976dda93cSYan, Zheng ret = setup_bdi(fs_info, &fs_info->bdi); 250076dda93cSYan, Zheng if (ret) { 250176dda93cSYan, Zheng err = ret; 250276dda93cSYan, Zheng goto fail_srcu; 250376dda93cSYan, Zheng } 250476dda93cSYan, Zheng 2505908c7f19STejun Heo ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL); 2506e2d84521SMiao Xie if (ret) { 2507e2d84521SMiao Xie err = ret; 2508e2d84521SMiao Xie goto fail_bdi; 2509e2d84521SMiao Xie } 2510e2d84521SMiao Xie fs_info->dirty_metadata_batch = PAGE_CACHE_SIZE * 2511e2d84521SMiao Xie (1 + ilog2(nr_cpu_ids)); 2512e2d84521SMiao Xie 2513908c7f19STejun Heo ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL); 2514963d678bSMiao Xie if (ret) { 2515963d678bSMiao Xie err = ret; 2516963d678bSMiao Xie goto fail_dirty_metadata_bytes; 2517963d678bSMiao Xie } 2518963d678bSMiao Xie 2519908c7f19STejun Heo ret = percpu_counter_init(&fs_info->bio_counter, 0, GFP_KERNEL); 2520c404e0dcSMiao Xie if (ret) { 2521c404e0dcSMiao Xie err = ret; 2522c404e0dcSMiao Xie goto fail_delalloc_bytes; 2523c404e0dcSMiao Xie } 2524c404e0dcSMiao Xie 252576dda93cSYan, Zheng fs_info->btree_inode = new_inode(sb); 252676dda93cSYan, Zheng if (!fs_info->btree_inode) { 252776dda93cSYan, Zheng err = -ENOMEM; 2528c404e0dcSMiao Xie goto fail_bio_counter; 252976dda93cSYan, Zheng } 253076dda93cSYan, Zheng 2531a6591715SChris Mason mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); 25321561dedaSMiao Xie 253376dda93cSYan, Zheng INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); 2534f28491e0SJosef Bacik INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC); 25358fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 2536facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 253724bbcf04SYan, Zheng INIT_LIST_HEAD(&fs_info->delayed_iputs); 2538eb73c1b7SMiao Xie INIT_LIST_HEAD(&fs_info->delalloc_roots); 253911833d66SYan Zheng INIT_LIST_HEAD(&fs_info->caching_block_groups); 2540eb73c1b7SMiao Xie spin_lock_init(&fs_info->delalloc_root_lock); 2541a4abeea4SJosef Bacik spin_lock_init(&fs_info->trans_lock); 254276dda93cSYan, Zheng spin_lock_init(&fs_info->fs_roots_radix_lock); 254324bbcf04SYan, Zheng spin_lock_init(&fs_info->delayed_iput_lock); 25444cb5300bSChris Mason spin_lock_init(&fs_info->defrag_inodes_lock); 25452bf64758SJosef Bacik spin_lock_init(&fs_info->free_chunk_lock); 2546f29021b2SJan Schmidt spin_lock_init(&fs_info->tree_mod_seq_lock); 2547ceda0864SMiao Xie spin_lock_init(&fs_info->super_lock); 2548fcebe456SJosef Bacik spin_lock_init(&fs_info->qgroup_op_lock); 2549f28491e0SJosef Bacik spin_lock_init(&fs_info->buffer_lock); 255047ab2a6cSJosef Bacik spin_lock_init(&fs_info->unused_bgs_lock); 2551f29021b2SJan Schmidt rwlock_init(&fs_info->tree_mod_log_lock); 2552d7c15171SZhao Lei mutex_init(&fs_info->unused_bg_unpin_mutex); 255367c5e7d4SFilipe Manana mutex_init(&fs_info->delete_unused_bgs_mutex); 25547585717fSChris Mason mutex_init(&fs_info->reloc_mutex); 2555573bfb72SMiao Xie mutex_init(&fs_info->delalloc_root_mutex); 2556de98ced9SMiao Xie seqlock_init(&fs_info->profiles_lock); 2557d7c15171SZhao Lei init_rwsem(&fs_info->delayed_iput_sem); 255819c00ddcSChris Mason 25590b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 25606324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 2561f29021b2SJan Schmidt INIT_LIST_HEAD(&fs_info->tree_mod_seq_list); 256247ab2a6cSJosef Bacik INIT_LIST_HEAD(&fs_info->unused_bgs); 25630b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 256466d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->global_block_rsv, 256566d8f3ddSMiao Xie BTRFS_BLOCK_RSV_GLOBAL); 256666d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->delalloc_block_rsv, 256766d8f3ddSMiao Xie BTRFS_BLOCK_RSV_DELALLOC); 256866d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS); 256966d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK); 257066d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY); 257166d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->delayed_block_rsv, 257266d8f3ddSMiao Xie BTRFS_BLOCK_RSV_DELOPS); 2573cb03c743SChris Mason atomic_set(&fs_info->nr_async_submits, 0); 2574771ed689SChris Mason atomic_set(&fs_info->async_delalloc_pages, 0); 25758c8bee1dSChris Mason atomic_set(&fs_info->async_submit_draining, 0); 25760986fe9eSChris Mason atomic_set(&fs_info->nr_async_bios, 0); 25774cb5300bSChris Mason atomic_set(&fs_info->defrag_running, 0); 2578fcebe456SJosef Bacik atomic_set(&fs_info->qgroup_op_seq, 0); 2579fc36ed7eSJan Schmidt atomic64_set(&fs_info->tree_mod_seq, 0); 2580e20d96d6SChris Mason fs_info->sb = sb; 258195ac567aSFilipe David Borba Manana fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE; 25829ed74f2dSJosef Bacik fs_info->metadata_ratio = 0; 25834cb5300bSChris Mason fs_info->defrag_inodes = RB_ROOT; 25842bf64758SJosef Bacik fs_info->free_chunk_space = 0; 2585f29021b2SJan Schmidt fs_info->tree_mod_log = RB_ROOT; 25868b87dc17SDavid Sterba fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; 2587f8c269d7SDavid Sterba fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */ 258890519d66SArne Jansen /* readahead state */ 258990519d66SArne Jansen INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT); 259090519d66SArne Jansen spin_lock_init(&fs_info->reada_lock); 2591c8b97818SChris Mason 2592b34b086cSChris Mason fs_info->thread_pool_size = min_t(unsigned long, 2593b34b086cSChris Mason num_online_cpus() + 2, 8); 25940afbaf8cSChris Mason 2595199c2a9cSMiao Xie INIT_LIST_HEAD(&fs_info->ordered_roots); 2596199c2a9cSMiao Xie spin_lock_init(&fs_info->ordered_root_lock); 259716cdcec7SMiao Xie fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), 259816cdcec7SMiao Xie GFP_NOFS); 259916cdcec7SMiao Xie if (!fs_info->delayed_root) { 260016cdcec7SMiao Xie err = -ENOMEM; 260116cdcec7SMiao Xie goto fail_iput; 260216cdcec7SMiao Xie } 260316cdcec7SMiao Xie btrfs_init_delayed_root(fs_info->delayed_root); 26043eaa2885SChris Mason 2605638aa7edSEric Sandeen btrfs_init_scrub(fs_info); 260621adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 260721adbd5cSStefan Behrens fs_info->check_integrity_print_mask = 0; 260821adbd5cSStefan Behrens #endif 2609779a65a4SEric Sandeen btrfs_init_balance(fs_info); 261021c7e756SMiao Xie btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work); 2611a2de733cSArne Jansen 2612a061fc8dSChris Mason sb->s_blocksize = 4096; 2613a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 261432a88aa1SJens Axboe sb->s_bdi = &fs_info->bdi; 2615a061fc8dSChris Mason 2616f37938e0SEric Sandeen btrfs_init_btree_inode(fs_info, tree_root); 261739279cc3SChris Mason 2618e02119d5SChris Mason spin_lock_init(&fs_info->block_group_cache_lock); 26196bef4d31SEric Paris fs_info->block_group_cache_tree = RB_ROOT; 2620a1897fddSLiu Bo fs_info->first_logical_byte = (u64)-1; 2621925baeddSChris Mason 262211833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[0], 2623f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 262411833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[1], 2625f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 262611833d66SYan Zheng fs_info->pinned_extents = &fs_info->freed_extents[0]; 2627e6dcd2dcSChris Mason fs_info->do_barriers = 1; 2628f9295749SChris Mason 2629d98237b3SChris Mason 26305a3f23d5SChris Mason mutex_init(&fs_info->ordered_operations_mutex); 263130ae8467SChris Mason mutex_init(&fs_info->tree_log_mutex); 2632925baeddSChris Mason mutex_init(&fs_info->chunk_mutex); 2633925baeddSChris Mason mutex_init(&fs_info->transaction_kthread_mutex); 2634a74a4b97SChris Mason mutex_init(&fs_info->cleaner_mutex); 2635a74a4b97SChris Mason mutex_init(&fs_info->volume_mutex); 26361bbc621eSChris Mason mutex_init(&fs_info->ro_block_group_mutex); 26379e351cc8SJosef Bacik init_rwsem(&fs_info->commit_root_sem); 2638c71bf099SYan, Zheng init_rwsem(&fs_info->cleanup_work_sem); 263976dda93cSYan, Zheng init_rwsem(&fs_info->subvol_sem); 2640803b2f54SStefan Behrens sema_init(&fs_info->uuid_tree_rescan_sem, 1); 2641fa9c0d79SChris Mason 2642ad618368SEric Sandeen btrfs_init_dev_replace_locks(fs_info); 2643f9e92e40SEric Sandeen btrfs_init_qgroup(fs_info); 2644416ac51dSArne Jansen 2645fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); 2646fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->data_alloc_cluster); 2647fa9c0d79SChris Mason 26487d9eb12cSChris Mason init_waitqueue_head(&fs_info->transaction_throttle); 26493768f368SChris Mason init_waitqueue_head(&fs_info->transaction_wait); 2650bb9c12c9SSage Weil init_waitqueue_head(&fs_info->transaction_blocked_wait); 26514854ddd0SChris Mason init_waitqueue_head(&fs_info->async_submit_wait); 26529a8dd150SChris Mason 265304216820SFilipe Manana INIT_LIST_HEAD(&fs_info->pinned_chunks); 265404216820SFilipe Manana 265553b381b3SDavid Woodhouse ret = btrfs_alloc_stripe_hash_table(fs_info); 265653b381b3SDavid Woodhouse if (ret) { 265783c8266aSDavid Sterba err = ret; 265853b381b3SDavid Woodhouse goto fail_alloc; 265953b381b3SDavid Woodhouse } 266053b381b3SDavid Woodhouse 2661707e8a07SDavid Sterba __setup_root(4096, 4096, 4096, tree_root, 26622c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 26637eccb903SChris Mason 26643c4bb26bSChris Mason invalidate_bdev(fs_devices->latest_bdev); 26651104a885SDavid Sterba 26661104a885SDavid Sterba /* 26671104a885SDavid Sterba * Read super block and check the signature bytes only 26681104a885SDavid Sterba */ 2669a512bbf8SYan Zheng bh = btrfs_read_dev_super(fs_devices->latest_bdev); 267020b45077SDave Young if (!bh) { 267120b45077SDave Young err = -EINVAL; 267216cdcec7SMiao Xie goto fail_alloc; 267320b45077SDave Young } 267439279cc3SChris Mason 26751104a885SDavid Sterba /* 26761104a885SDavid Sterba * We want to check superblock checksum, the type is stored inside. 26771104a885SDavid Sterba * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k). 26781104a885SDavid Sterba */ 26791104a885SDavid Sterba if (btrfs_check_super_csum(bh->b_data)) { 2680efe120a0SFrank Holton printk(KERN_ERR "BTRFS: superblock checksum mismatch\n"); 26811104a885SDavid Sterba err = -EINVAL; 26821104a885SDavid Sterba goto fail_alloc; 26831104a885SDavid Sterba } 26841104a885SDavid Sterba 26851104a885SDavid Sterba /* 26861104a885SDavid Sterba * super_copy is zeroed at allocation time and we never touch the 26871104a885SDavid Sterba * following bytes up to INFO_SIZE, the checksum is calculated from 26881104a885SDavid Sterba * the whole block of INFO_SIZE 26891104a885SDavid Sterba */ 26906c41761fSDavid Sterba memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy)); 26916c41761fSDavid Sterba memcpy(fs_info->super_for_commit, fs_info->super_copy, 26926c41761fSDavid Sterba sizeof(*fs_info->super_for_commit)); 2693a061fc8dSChris Mason brelse(bh); 26945f39d397SChris Mason 26956c41761fSDavid Sterba memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); 26960b86a832SChris Mason 26971104a885SDavid Sterba ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); 26981104a885SDavid Sterba if (ret) { 2699efe120a0SFrank Holton printk(KERN_ERR "BTRFS: superblock contains fatal errors\n"); 27001104a885SDavid Sterba err = -EINVAL; 27011104a885SDavid Sterba goto fail_alloc; 27021104a885SDavid Sterba } 27031104a885SDavid Sterba 27046c41761fSDavid Sterba disk_super = fs_info->super_copy; 27050f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 270616cdcec7SMiao Xie goto fail_alloc; 27070f7d52f4SChris Mason 2708acce952bSliubo /* check FS state, whether FS is broken. */ 270987533c47SMiao Xie if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR) 271087533c47SMiao Xie set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 2711acce952bSliubo 271275e7cb7fSLiu Bo /* 2713af31f5e5SChris Mason * run through our array of backup supers and setup 2714af31f5e5SChris Mason * our ring pointer to the oldest one 2715af31f5e5SChris Mason */ 2716af31f5e5SChris Mason generation = btrfs_super_generation(disk_super); 2717af31f5e5SChris Mason find_oldest_super_backup(fs_info, generation); 2718af31f5e5SChris Mason 2719af31f5e5SChris Mason /* 272075e7cb7fSLiu Bo * In the long term, we'll store the compression type in the super 272175e7cb7fSLiu Bo * block, and it'll be used for per file compression control. 272275e7cb7fSLiu Bo */ 272375e7cb7fSLiu Bo fs_info->compress_type = BTRFS_COMPRESS_ZLIB; 272475e7cb7fSLiu Bo 27252b82032cSYan Zheng ret = btrfs_parse_options(tree_root, options); 27262b82032cSYan Zheng if (ret) { 27272b82032cSYan Zheng err = ret; 272816cdcec7SMiao Xie goto fail_alloc; 27292b82032cSYan Zheng } 2730dfe25020SChris Mason 2731f2b636e8SJosef Bacik features = btrfs_super_incompat_flags(disk_super) & 2732f2b636e8SJosef Bacik ~BTRFS_FEATURE_INCOMPAT_SUPP; 2733f2b636e8SJosef Bacik if (features) { 2734f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount because of " 2735f2b636e8SJosef Bacik "unsupported optional features (%Lx).\n", 2736c1c9ff7cSGeert Uytterhoeven features); 2737f2b636e8SJosef Bacik err = -EINVAL; 273816cdcec7SMiao Xie goto fail_alloc; 2739f2b636e8SJosef Bacik } 2740f2b636e8SJosef Bacik 2741707e8a07SDavid Sterba /* 2742707e8a07SDavid Sterba * Leafsize and nodesize were always equal, this is only a sanity check. 2743707e8a07SDavid Sterba */ 2744707e8a07SDavid Sterba if (le32_to_cpu(disk_super->__unused_leafsize) != 2745727011e0SChris Mason btrfs_super_nodesize(disk_super)) { 2746727011e0SChris Mason printk(KERN_ERR "BTRFS: couldn't mount because metadata " 2747727011e0SChris Mason "blocksizes don't match. node %d leaf %d\n", 2748727011e0SChris Mason btrfs_super_nodesize(disk_super), 2749707e8a07SDavid Sterba le32_to_cpu(disk_super->__unused_leafsize)); 2750727011e0SChris Mason err = -EINVAL; 2751727011e0SChris Mason goto fail_alloc; 2752727011e0SChris Mason } 2753707e8a07SDavid Sterba if (btrfs_super_nodesize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) { 2754727011e0SChris Mason printk(KERN_ERR "BTRFS: couldn't mount because metadata " 2755727011e0SChris Mason "blocksize (%d) was too large\n", 2756707e8a07SDavid Sterba btrfs_super_nodesize(disk_super)); 2757727011e0SChris Mason err = -EINVAL; 2758727011e0SChris Mason goto fail_alloc; 2759727011e0SChris Mason } 2760727011e0SChris Mason 27615d4f98a2SYan Zheng features = btrfs_super_incompat_flags(disk_super); 27625d4f98a2SYan Zheng features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; 276369e380d1SLi Zefan if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 2764a6fa6faeSLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 2765727011e0SChris Mason 27663173a18fSJosef Bacik if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA) 27675efa0490SDavid Sterba printk(KERN_INFO "BTRFS: has skinny extents\n"); 27683173a18fSJosef Bacik 2769727011e0SChris Mason /* 2770727011e0SChris Mason * flag our filesystem as having big metadata blocks if 2771727011e0SChris Mason * they are bigger than the page size 2772727011e0SChris Mason */ 2773707e8a07SDavid Sterba if (btrfs_super_nodesize(disk_super) > PAGE_CACHE_SIZE) { 2774727011e0SChris Mason if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA)) 2775efe120a0SFrank Holton printk(KERN_INFO "BTRFS: flagging fs with big metadata feature\n"); 2776727011e0SChris Mason features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA; 2777727011e0SChris Mason } 2778727011e0SChris Mason 2779bc3f116fSChris Mason nodesize = btrfs_super_nodesize(disk_super); 2780bc3f116fSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 2781bc3f116fSChris Mason stripesize = btrfs_super_stripesize(disk_super); 2782707e8a07SDavid Sterba fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids)); 2783963d678bSMiao Xie fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids)); 2784bc3f116fSChris Mason 2785bc3f116fSChris Mason /* 2786bc3f116fSChris Mason * mixed block groups end up with duplicate but slightly offset 2787bc3f116fSChris Mason * extent buffers for the same range. It leads to corruptions 2788bc3f116fSChris Mason */ 2789bc3f116fSChris Mason if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) && 2790707e8a07SDavid Sterba (sectorsize != nodesize)) { 2791aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: unequal leaf/node/sector sizes " 2792bc3f116fSChris Mason "are not allowed for mixed block groups on %s\n", 2793bc3f116fSChris Mason sb->s_id); 2794bc3f116fSChris Mason goto fail_alloc; 2795bc3f116fSChris Mason } 2796bc3f116fSChris Mason 2797ceda0864SMiao Xie /* 2798ceda0864SMiao Xie * Needn't use the lock because there is no other task which will 2799ceda0864SMiao Xie * update the flag. 2800ceda0864SMiao Xie */ 28015d4f98a2SYan Zheng btrfs_set_super_incompat_flags(disk_super, features); 28025d4f98a2SYan Zheng 2803f2b636e8SJosef Bacik features = btrfs_super_compat_ro_flags(disk_super) & 2804f2b636e8SJosef Bacik ~BTRFS_FEATURE_COMPAT_RO_SUPP; 2805f2b636e8SJosef Bacik if (!(sb->s_flags & MS_RDONLY) && features) { 2806f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " 2807f2b636e8SJosef Bacik "unsupported option features (%Lx).\n", 2808c1c9ff7cSGeert Uytterhoeven features); 2809f2b636e8SJosef Bacik err = -EINVAL; 281016cdcec7SMiao Xie goto fail_alloc; 2811f2b636e8SJosef Bacik } 281261d92c32SChris Mason 28135cdc7ad3SQu Wenruo max_active = fs_info->thread_pool_size; 281461d92c32SChris Mason 28152a458198SEric Sandeen ret = btrfs_init_workqueues(fs_info, fs_devices); 28162a458198SEric Sandeen if (ret) { 28172a458198SEric Sandeen err = ret; 28180dc3b84aSJosef Bacik goto fail_sb_buffer; 28190dc3b84aSJosef Bacik } 28204543df7eSChris Mason 28214575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 2822c8b97818SChris Mason fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, 2823c8b97818SChris Mason 4 * 1024 * 1024 / PAGE_CACHE_SIZE); 28244575c9ccSChris Mason 2825db94535dSChris Mason tree_root->nodesize = nodesize; 2826db94535dSChris Mason tree_root->sectorsize = sectorsize; 282787ee04ebSChris Mason tree_root->stripesize = stripesize; 2828a061fc8dSChris Mason 2829a061fc8dSChris Mason sb->s_blocksize = sectorsize; 2830a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 2831db94535dSChris Mason 28323cae210fSQu Wenruo if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) { 2833aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: valid FS not found on %s\n", sb->s_id); 283439279cc3SChris Mason goto fail_sb_buffer; 283539279cc3SChris Mason } 283619c00ddcSChris Mason 28378d082fb7SLiu Bo if (sectorsize != PAGE_SIZE) { 2838aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: incompatible sector size (%lu) " 28398d082fb7SLiu Bo "found on %s\n", (unsigned long)sectorsize, sb->s_id); 2840941b2ddfSKeith Mannthey goto fail_sb_buffer; 2841941b2ddfSKeith Mannthey } 2842941b2ddfSKeith Mannthey 2843925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 2844e4404d6eSYan Zheng ret = btrfs_read_sys_array(tree_root); 2845925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 284684eed90fSChris Mason if (ret) { 2847aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to read the system " 2848d397712bSChris Mason "array on %s\n", sb->s_id); 28495d4f98a2SYan Zheng goto fail_sb_buffer; 285084eed90fSChris Mason } 28510b86a832SChris Mason 285284234f3aSYan Zheng generation = btrfs_super_chunk_root_generation(disk_super); 28530b86a832SChris Mason 2854707e8a07SDavid Sterba __setup_root(nodesize, sectorsize, stripesize, chunk_root, 2855707e8a07SDavid Sterba fs_info, BTRFS_CHUNK_TREE_OBJECTID); 28560b86a832SChris Mason 28570b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 28580b86a832SChris Mason btrfs_super_chunk_root(disk_super), 2859ce86cd59SDavid Sterba generation); 286064c043deSLiu Bo if (IS_ERR(chunk_root->node) || 286164c043deSLiu Bo !extent_buffer_uptodate(chunk_root->node)) { 2862aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to read chunk root on %s\n", 286383121942SDavid Woodhouse sb->s_id); 2864e5fffbacSchandan if (!IS_ERR(chunk_root->node)) 2865e5fffbacSchandan free_extent_buffer(chunk_root->node); 286695ab1f64SZhao Lei chunk_root->node = NULL; 2867af31f5e5SChris Mason goto fail_tree_roots; 286883121942SDavid Woodhouse } 28695d4f98a2SYan Zheng btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); 28705d4f98a2SYan Zheng chunk_root->commit_root = btrfs_root_node(chunk_root); 28710b86a832SChris Mason 2872e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 2873b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE); 2874e17cade2SChris Mason 28750b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 28762b82032cSYan Zheng if (ret) { 2877aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to read chunk tree on %s\n", 2878d397712bSChris Mason sb->s_id); 2879af31f5e5SChris Mason goto fail_tree_roots; 28802b82032cSYan Zheng } 28810b86a832SChris Mason 28828dabb742SStefan Behrens /* 28838dabb742SStefan Behrens * keep the device that is marked to be the target device for the 28848dabb742SStefan Behrens * dev_replace procedure 28858dabb742SStefan Behrens */ 28869eaed21eSEric Sandeen btrfs_close_extra_devices(fs_devices, 0); 2887dfe25020SChris Mason 2888a6b0d5c8SChris Mason if (!fs_devices->latest_bdev) { 2889aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to read devices on %s\n", 2890a6b0d5c8SChris Mason sb->s_id); 2891a6b0d5c8SChris Mason goto fail_tree_roots; 2892a6b0d5c8SChris Mason } 2893a6b0d5c8SChris Mason 2894af31f5e5SChris Mason retry_root_backup: 289584234f3aSYan Zheng generation = btrfs_super_generation(disk_super); 28960b86a832SChris Mason 2897e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 2898db94535dSChris Mason btrfs_super_root(disk_super), 2899ce86cd59SDavid Sterba generation); 290064c043deSLiu Bo if (IS_ERR(tree_root->node) || 290164c043deSLiu Bo !extent_buffer_uptodate(tree_root->node)) { 2902efe120a0SFrank Holton printk(KERN_WARNING "BTRFS: failed to read tree root on %s\n", 290383121942SDavid Woodhouse sb->s_id); 2904e5fffbacSchandan if (!IS_ERR(tree_root->node)) 2905e5fffbacSchandan free_extent_buffer(tree_root->node); 290695ab1f64SZhao Lei tree_root->node = NULL; 2907af31f5e5SChris Mason goto recovery_tree_root; 290883121942SDavid Woodhouse } 2909af31f5e5SChris Mason 29105d4f98a2SYan Zheng btrfs_set_root_node(&tree_root->root_item, tree_root->node); 29115d4f98a2SYan Zheng tree_root->commit_root = btrfs_root_node(tree_root); 291269e9c6c6SStefan Behrens btrfs_set_root_refs(&tree_root->root_item, 1); 2913db94535dSChris Mason 29144bbcaa64SEric Sandeen ret = btrfs_read_roots(fs_info, tree_root); 29154bbcaa64SEric Sandeen if (ret) 2916af31f5e5SChris Mason goto recovery_tree_root; 2917f7a81ea4SStefan Behrens 29188929ecfaSYan, Zheng fs_info->generation = generation; 29198929ecfaSYan, Zheng fs_info->last_trans_committed = generation; 29208929ecfaSYan, Zheng 292168310a5eSIlya Dryomov ret = btrfs_recover_balance(fs_info); 292268310a5eSIlya Dryomov if (ret) { 2923aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to recover balance\n"); 292468310a5eSIlya Dryomov goto fail_block_groups; 292568310a5eSIlya Dryomov } 292668310a5eSIlya Dryomov 2927733f4fbbSStefan Behrens ret = btrfs_init_dev_stats(fs_info); 2928733f4fbbSStefan Behrens if (ret) { 2929efe120a0SFrank Holton printk(KERN_ERR "BTRFS: failed to init dev_stats: %d\n", 2930733f4fbbSStefan Behrens ret); 2931733f4fbbSStefan Behrens goto fail_block_groups; 2932733f4fbbSStefan Behrens } 2933733f4fbbSStefan Behrens 29348dabb742SStefan Behrens ret = btrfs_init_dev_replace(fs_info); 29358dabb742SStefan Behrens if (ret) { 2936efe120a0SFrank Holton pr_err("BTRFS: failed to init dev_replace: %d\n", ret); 29378dabb742SStefan Behrens goto fail_block_groups; 29388dabb742SStefan Behrens } 29398dabb742SStefan Behrens 29409eaed21eSEric Sandeen btrfs_close_extra_devices(fs_devices, 1); 29418dabb742SStefan Behrens 2942b7c35e81SAnand Jain ret = btrfs_sysfs_add_fsid(fs_devices, NULL); 2943b7c35e81SAnand Jain if (ret) { 2944b7c35e81SAnand Jain pr_err("BTRFS: failed to init sysfs fsid interface: %d\n", ret); 2945b7c35e81SAnand Jain goto fail_block_groups; 2946b7c35e81SAnand Jain } 2947b7c35e81SAnand Jain 2948b7c35e81SAnand Jain ret = btrfs_sysfs_add_device(fs_devices); 2949b7c35e81SAnand Jain if (ret) { 2950b7c35e81SAnand Jain pr_err("BTRFS: failed to init sysfs device interface: %d\n", ret); 2951b7c35e81SAnand Jain goto fail_fsdev_sysfs; 2952b7c35e81SAnand Jain } 2953b7c35e81SAnand Jain 29545ac1d209SJeff Mahoney ret = btrfs_sysfs_add_one(fs_info); 29555ac1d209SJeff Mahoney if (ret) { 2956efe120a0SFrank Holton pr_err("BTRFS: failed to init sysfs interface: %d\n", ret); 2957b7c35e81SAnand Jain goto fail_fsdev_sysfs; 29585ac1d209SJeff Mahoney } 29595ac1d209SJeff Mahoney 2960c59021f8Sliubo ret = btrfs_init_space_info(fs_info); 2961c59021f8Sliubo if (ret) { 2962efe120a0SFrank Holton printk(KERN_ERR "BTRFS: Failed to initial space info: %d\n", ret); 29632365dd3cSAnand Jain goto fail_sysfs; 2964c59021f8Sliubo } 2965c59021f8Sliubo 29664bbcaa64SEric Sandeen ret = btrfs_read_block_groups(fs_info->extent_root); 29671b1d1f66SJosef Bacik if (ret) { 2968efe120a0SFrank Holton printk(KERN_ERR "BTRFS: Failed to read block groups: %d\n", ret); 29692365dd3cSAnand Jain goto fail_sysfs; 29701b1d1f66SJosef Bacik } 29715af3e8ccSStefan Behrens fs_info->num_tolerated_disk_barrier_failures = 29725af3e8ccSStefan Behrens btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); 2973292fd7fcSStefan Behrens if (fs_info->fs_devices->missing_devices > 2974292fd7fcSStefan Behrens fs_info->num_tolerated_disk_barrier_failures && 2975292fd7fcSStefan Behrens !(sb->s_flags & MS_RDONLY)) { 297678fa1770SZhao Lei pr_warn("BTRFS: missing devices(%llu) exceeds the limit(%d), writeable mount is not allowed\n", 297778fa1770SZhao Lei fs_info->fs_devices->missing_devices, 297878fa1770SZhao Lei fs_info->num_tolerated_disk_barrier_failures); 29792365dd3cSAnand Jain goto fail_sysfs; 2980292fd7fcSStefan Behrens } 29819078a3e1SChris Mason 2982a74a4b97SChris Mason fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, 2983a74a4b97SChris Mason "btrfs-cleaner"); 298457506d50SQinghuang Feng if (IS_ERR(fs_info->cleaner_kthread)) 29852365dd3cSAnand Jain goto fail_sysfs; 2986a74a4b97SChris Mason 2987a74a4b97SChris Mason fs_info->transaction_kthread = kthread_run(transaction_kthread, 2988a74a4b97SChris Mason tree_root, 2989a74a4b97SChris Mason "btrfs-transaction"); 299057506d50SQinghuang Feng if (IS_ERR(fs_info->transaction_kthread)) 29913f157a2fSChris Mason goto fail_cleaner; 2992a74a4b97SChris Mason 2993c289811cSChris Mason if (!btrfs_test_opt(tree_root, SSD) && 2994c289811cSChris Mason !btrfs_test_opt(tree_root, NOSSD) && 2995c289811cSChris Mason !fs_info->fs_devices->rotating) { 2996efe120a0SFrank Holton printk(KERN_INFO "BTRFS: detected SSD devices, enabling SSD " 2997c289811cSChris Mason "mode\n"); 2998c289811cSChris Mason btrfs_set_opt(fs_info->mount_opt, SSD); 2999c289811cSChris Mason } 3000c289811cSChris Mason 3001572d9ab7SDavid Sterba /* 3002572d9ab7SDavid Sterba * Mount does not set all options immediatelly, we can do it now and do 3003572d9ab7SDavid Sterba * not have to wait for transaction commit 3004572d9ab7SDavid Sterba */ 3005572d9ab7SDavid Sterba btrfs_apply_pending_changes(fs_info); 30063818aea2SQu Wenruo 300721adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 300821adbd5cSStefan Behrens if (btrfs_test_opt(tree_root, CHECK_INTEGRITY)) { 300921adbd5cSStefan Behrens ret = btrfsic_mount(tree_root, fs_devices, 301021adbd5cSStefan Behrens btrfs_test_opt(tree_root, 301121adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ? 301221adbd5cSStefan Behrens 1 : 0, 301321adbd5cSStefan Behrens fs_info->check_integrity_print_mask); 301421adbd5cSStefan Behrens if (ret) 3015efe120a0SFrank Holton printk(KERN_WARNING "BTRFS: failed to initialize" 301621adbd5cSStefan Behrens " integrity check module %s\n", sb->s_id); 301721adbd5cSStefan Behrens } 301821adbd5cSStefan Behrens #endif 3019bcef60f2SArne Jansen ret = btrfs_read_qgroup_config(fs_info); 3020bcef60f2SArne Jansen if (ret) 3021bcef60f2SArne Jansen goto fail_trans_kthread; 302221adbd5cSStefan Behrens 3023acce952bSliubo /* do not make disk changes in broken FS */ 302468ce9682SStefan Behrens if (btrfs_super_log_root(disk_super) != 0) { 302563443bf5SEric Sandeen ret = btrfs_replay_log(fs_info, fs_devices); 302679787eaaSJeff Mahoney if (ret) { 302763443bf5SEric Sandeen err = ret; 302828c16cbbSWang Shilong goto fail_qgroup; 3029e556ce2cSYan Zheng } 3030e02119d5SChris Mason } 30311a40e23bSZheng Yan 303276dda93cSYan, Zheng ret = btrfs_find_orphan_roots(tree_root); 303379787eaaSJeff Mahoney if (ret) 303428c16cbbSWang Shilong goto fail_qgroup; 303576dda93cSYan, Zheng 30367c2ca468SChris Mason if (!(sb->s_flags & MS_RDONLY)) { 3037d68fc57bSYan, Zheng ret = btrfs_cleanup_fs_roots(fs_info); 303844c44af2SIlya Dryomov if (ret) 303928c16cbbSWang Shilong goto fail_qgroup; 3040d68fc57bSYan, Zheng 30415f316481SWang Shilong mutex_lock(&fs_info->cleaner_mutex); 30425d4f98a2SYan Zheng ret = btrfs_recover_relocation(tree_root); 30435f316481SWang Shilong mutex_unlock(&fs_info->cleaner_mutex); 3044d7ce5843SMiao Xie if (ret < 0) { 3045d7ce5843SMiao Xie printk(KERN_WARNING 3046efe120a0SFrank Holton "BTRFS: failed to recover relocation\n"); 3047d7ce5843SMiao Xie err = -EINVAL; 3048bcef60f2SArne Jansen goto fail_qgroup; 3049d7ce5843SMiao Xie } 30507c2ca468SChris Mason } 30511a40e23bSZheng Yan 30523de4586cSChris Mason location.objectid = BTRFS_FS_TREE_OBJECTID; 30533de4586cSChris Mason location.type = BTRFS_ROOT_ITEM_KEY; 3054cb517eabSMiao Xie location.offset = 0; 30553de4586cSChris Mason 30563de4586cSChris Mason fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); 30573140c9a3SDan Carpenter if (IS_ERR(fs_info->fs_root)) { 30583140c9a3SDan Carpenter err = PTR_ERR(fs_info->fs_root); 3059bcef60f2SArne Jansen goto fail_qgroup; 30603140c9a3SDan Carpenter } 3061c289811cSChris Mason 30622b6ba629SIlya Dryomov if (sb->s_flags & MS_RDONLY) 30632b6ba629SIlya Dryomov return 0; 30642b6ba629SIlya Dryomov 3065e3acc2a6SJosef Bacik down_read(&fs_info->cleanup_work_sem); 30662b6ba629SIlya Dryomov if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) || 30672b6ba629SIlya Dryomov (ret = btrfs_orphan_cleanup(fs_info->tree_root))) { 30682b6ba629SIlya Dryomov up_read(&fs_info->cleanup_work_sem); 30692b6ba629SIlya Dryomov close_ctree(tree_root); 30702b6ba629SIlya Dryomov return ret; 30712b6ba629SIlya Dryomov } 3072e3acc2a6SJosef Bacik up_read(&fs_info->cleanup_work_sem); 307359641015SIlya Dryomov 30742b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 30752b6ba629SIlya Dryomov if (ret) { 3076efe120a0SFrank Holton printk(KERN_WARNING "BTRFS: failed to resume balance\n"); 307766b4ffd1SJosef Bacik close_ctree(tree_root); 30782b6ba629SIlya Dryomov return ret; 3079e3acc2a6SJosef Bacik } 3080e3acc2a6SJosef Bacik 30818dabb742SStefan Behrens ret = btrfs_resume_dev_replace_async(fs_info); 30828dabb742SStefan Behrens if (ret) { 3083efe120a0SFrank Holton pr_warn("BTRFS: failed to resume dev_replace\n"); 30848dabb742SStefan Behrens close_ctree(tree_root); 30858dabb742SStefan Behrens return ret; 30868dabb742SStefan Behrens } 30878dabb742SStefan Behrens 3088b382a324SJan Schmidt btrfs_qgroup_rescan_resume(fs_info); 3089b382a324SJan Schmidt 309070f6d82eSOmar Sandoval if (btrfs_test_opt(tree_root, CLEAR_CACHE) && 309170f6d82eSOmar Sandoval btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { 309270f6d82eSOmar Sandoval pr_info("BTRFS: clearing free space tree\n"); 309370f6d82eSOmar Sandoval ret = btrfs_clear_free_space_tree(fs_info); 309470f6d82eSOmar Sandoval if (ret) { 309570f6d82eSOmar Sandoval pr_warn("BTRFS: failed to clear free space tree %d\n", 309670f6d82eSOmar Sandoval ret); 309770f6d82eSOmar Sandoval close_ctree(tree_root); 309870f6d82eSOmar Sandoval return ret; 309970f6d82eSOmar Sandoval } 310070f6d82eSOmar Sandoval } 310170f6d82eSOmar Sandoval 310270f6d82eSOmar Sandoval if (btrfs_test_opt(tree_root, FREE_SPACE_TREE) && 310370f6d82eSOmar Sandoval !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { 310470f6d82eSOmar Sandoval pr_info("BTRFS: creating free space tree\n"); 310570f6d82eSOmar Sandoval ret = btrfs_create_free_space_tree(fs_info); 310670f6d82eSOmar Sandoval if (ret) { 310770f6d82eSOmar Sandoval pr_warn("BTRFS: failed to create free space tree %d\n", 310870f6d82eSOmar Sandoval ret); 310970f6d82eSOmar Sandoval close_ctree(tree_root); 311070f6d82eSOmar Sandoval return ret; 311170f6d82eSOmar Sandoval } 311270f6d82eSOmar Sandoval } 311370f6d82eSOmar Sandoval 31144bbcaa64SEric Sandeen if (!fs_info->uuid_root) { 3115efe120a0SFrank Holton pr_info("BTRFS: creating UUID tree\n"); 3116f7a81ea4SStefan Behrens ret = btrfs_create_uuid_tree(fs_info); 3117f7a81ea4SStefan Behrens if (ret) { 3118efe120a0SFrank Holton pr_warn("BTRFS: failed to create the UUID tree %d\n", 3119f7a81ea4SStefan Behrens ret); 3120f7a81ea4SStefan Behrens close_ctree(tree_root); 3121f7a81ea4SStefan Behrens return ret; 3122f7a81ea4SStefan Behrens } 31234bbcaa64SEric Sandeen } else if (btrfs_test_opt(tree_root, RESCAN_UUID_TREE) || 31244bbcaa64SEric Sandeen fs_info->generation != 31254bbcaa64SEric Sandeen btrfs_super_uuid_tree_generation(disk_super)) { 3126efe120a0SFrank Holton pr_info("BTRFS: checking UUID tree\n"); 312770f80175SStefan Behrens ret = btrfs_check_uuid_tree(fs_info); 312870f80175SStefan Behrens if (ret) { 3129efe120a0SFrank Holton pr_warn("BTRFS: failed to check the UUID tree %d\n", 313070f80175SStefan Behrens ret); 313170f80175SStefan Behrens close_ctree(tree_root); 313270f80175SStefan Behrens return ret; 313370f80175SStefan Behrens } 313470f80175SStefan Behrens } else { 313570f80175SStefan Behrens fs_info->update_uuid_tree_gen = 1; 3136f7a81ea4SStefan Behrens } 3137f7a81ea4SStefan Behrens 313847ab2a6cSJosef Bacik fs_info->open = 1; 313947ab2a6cSJosef Bacik 3140ad2b2c80SAl Viro return 0; 314139279cc3SChris Mason 3142bcef60f2SArne Jansen fail_qgroup: 3143bcef60f2SArne Jansen btrfs_free_qgroup_config(fs_info); 31447c2ca468SChris Mason fail_trans_kthread: 31457c2ca468SChris Mason kthread_stop(fs_info->transaction_kthread); 314654067ae9SJosef Bacik btrfs_cleanup_transaction(fs_info->tree_root); 3147faa2dbf0SJosef Bacik btrfs_free_fs_roots(fs_info); 31483f157a2fSChris Mason fail_cleaner: 3149a74a4b97SChris Mason kthread_stop(fs_info->cleaner_kthread); 31507c2ca468SChris Mason 31517c2ca468SChris Mason /* 31527c2ca468SChris Mason * make sure we're done with the btree inode before we stop our 31537c2ca468SChris Mason * kthreads 31547c2ca468SChris Mason */ 31557c2ca468SChris Mason filemap_write_and_wait(fs_info->btree_inode->i_mapping); 31567c2ca468SChris Mason 31572365dd3cSAnand Jain fail_sysfs: 31582365dd3cSAnand Jain btrfs_sysfs_remove_one(fs_info); 31592365dd3cSAnand Jain 3160b7c35e81SAnand Jain fail_fsdev_sysfs: 3161b7c35e81SAnand Jain btrfs_sysfs_remove_fsid(fs_info->fs_devices); 3162b7c35e81SAnand Jain 31631b1d1f66SJosef Bacik fail_block_groups: 316454067ae9SJosef Bacik btrfs_put_block_group_cache(fs_info); 31651b1d1f66SJosef Bacik btrfs_free_block_groups(fs_info); 3166af31f5e5SChris Mason 3167af31f5e5SChris Mason fail_tree_roots: 3168af31f5e5SChris Mason free_root_pointers(fs_info, 1); 31692b8195bbSMiao Xie invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 3170af31f5e5SChris Mason 317139279cc3SChris Mason fail_sb_buffer: 31727abadb64SLiu Bo btrfs_stop_all_workers(fs_info); 317316cdcec7SMiao Xie fail_alloc: 31744543df7eSChris Mason fail_iput: 3175586e46e2SIlya Dryomov btrfs_mapping_tree_free(&fs_info->mapping_tree); 3176586e46e2SIlya Dryomov 31774543df7eSChris Mason iput(fs_info->btree_inode); 3178c404e0dcSMiao Xie fail_bio_counter: 3179c404e0dcSMiao Xie percpu_counter_destroy(&fs_info->bio_counter); 3180963d678bSMiao Xie fail_delalloc_bytes: 3181963d678bSMiao Xie percpu_counter_destroy(&fs_info->delalloc_bytes); 3182e2d84521SMiao Xie fail_dirty_metadata_bytes: 3183e2d84521SMiao Xie percpu_counter_destroy(&fs_info->dirty_metadata_bytes); 3184ad081f14SJens Axboe fail_bdi: 31857e662854SQinghuang Feng bdi_destroy(&fs_info->bdi); 318676dda93cSYan, Zheng fail_srcu: 318776dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 31887e662854SQinghuang Feng fail: 318953b381b3SDavid Woodhouse btrfs_free_stripe_hash_table(fs_info); 3190586e46e2SIlya Dryomov btrfs_close_devices(fs_info->fs_devices); 3191ad2b2c80SAl Viro return err; 3192af31f5e5SChris Mason 3193af31f5e5SChris Mason recovery_tree_root: 3194af31f5e5SChris Mason if (!btrfs_test_opt(tree_root, RECOVERY)) 3195af31f5e5SChris Mason goto fail_tree_roots; 3196af31f5e5SChris Mason 3197af31f5e5SChris Mason free_root_pointers(fs_info, 0); 3198af31f5e5SChris Mason 3199af31f5e5SChris Mason /* don't use the log in recovery mode, it won't be valid */ 3200af31f5e5SChris Mason btrfs_set_super_log_root(disk_super, 0); 3201af31f5e5SChris Mason 3202af31f5e5SChris Mason /* we can't trust the free space cache either */ 3203af31f5e5SChris Mason btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE); 3204af31f5e5SChris Mason 3205af31f5e5SChris Mason ret = next_root_backup(fs_info, fs_info->super_copy, 3206af31f5e5SChris Mason &num_backups_tried, &backup_index); 3207af31f5e5SChris Mason if (ret == -1) 3208af31f5e5SChris Mason goto fail_block_groups; 3209af31f5e5SChris Mason goto retry_root_backup; 3210eb60ceacSChris Mason } 3211eb60ceacSChris Mason 3212f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 3213f2984462SChris Mason { 3214f2984462SChris Mason if (uptodate) { 3215f2984462SChris Mason set_buffer_uptodate(bh); 3216f2984462SChris Mason } else { 3217442a4f63SStefan Behrens struct btrfs_device *device = (struct btrfs_device *) 3218442a4f63SStefan Behrens bh->b_private; 3219442a4f63SStefan Behrens 3220efe120a0SFrank Holton printk_ratelimited_in_rcu(KERN_WARNING "BTRFS: lost page write due to " 3221606686eeSJosef Bacik "I/O error on %s\n", 3222606686eeSJosef Bacik rcu_str_deref(device->name)); 32231259ab75SChris Mason /* note, we dont' set_buffer_write_io_error because we have 32241259ab75SChris Mason * our own ways of dealing with the IO errors 32251259ab75SChris Mason */ 3226f2984462SChris Mason clear_buffer_uptodate(bh); 3227442a4f63SStefan Behrens btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS); 3228f2984462SChris Mason } 3229f2984462SChris Mason unlock_buffer(bh); 3230f2984462SChris Mason put_bh(bh); 3231f2984462SChris Mason } 3232f2984462SChris Mason 3233a512bbf8SYan Zheng struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) 3234a512bbf8SYan Zheng { 3235a512bbf8SYan Zheng struct buffer_head *bh; 3236a512bbf8SYan Zheng struct buffer_head *latest = NULL; 3237a512bbf8SYan Zheng struct btrfs_super_block *super; 3238a512bbf8SYan Zheng int i; 3239a512bbf8SYan Zheng u64 transid = 0; 3240a512bbf8SYan Zheng u64 bytenr; 3241a512bbf8SYan Zheng 3242a512bbf8SYan Zheng /* we would like to check all the supers, but that would make 3243a512bbf8SYan Zheng * a btrfs mount succeed after a mkfs from a different FS. 3244a512bbf8SYan Zheng * So, we need to add a special mount option to scan for 3245a512bbf8SYan Zheng * later supers, using BTRFS_SUPER_MIRROR_MAX instead 3246a512bbf8SYan Zheng */ 3247a512bbf8SYan Zheng for (i = 0; i < 1; i++) { 3248a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 32498068a47eSAnand Jain if (bytenr + BTRFS_SUPER_INFO_SIZE >= 32508068a47eSAnand Jain i_size_read(bdev->bd_inode)) 3251a512bbf8SYan Zheng break; 32528068a47eSAnand Jain bh = __bread(bdev, bytenr / 4096, 32538068a47eSAnand Jain BTRFS_SUPER_INFO_SIZE); 3254a512bbf8SYan Zheng if (!bh) 3255a512bbf8SYan Zheng continue; 3256a512bbf8SYan Zheng 3257a512bbf8SYan Zheng super = (struct btrfs_super_block *)bh->b_data; 3258a512bbf8SYan Zheng if (btrfs_super_bytenr(super) != bytenr || 32593cae210fSQu Wenruo btrfs_super_magic(super) != BTRFS_MAGIC) { 3260a512bbf8SYan Zheng brelse(bh); 3261a512bbf8SYan Zheng continue; 3262a512bbf8SYan Zheng } 3263a512bbf8SYan Zheng 3264a512bbf8SYan Zheng if (!latest || btrfs_super_generation(super) > transid) { 3265a512bbf8SYan Zheng brelse(latest); 3266a512bbf8SYan Zheng latest = bh; 3267a512bbf8SYan Zheng transid = btrfs_super_generation(super); 3268a512bbf8SYan Zheng } else { 3269a512bbf8SYan Zheng brelse(bh); 3270a512bbf8SYan Zheng } 3271a512bbf8SYan Zheng } 3272a512bbf8SYan Zheng return latest; 3273a512bbf8SYan Zheng } 3274a512bbf8SYan Zheng 32754eedeb75SHisashi Hifumi /* 32764eedeb75SHisashi Hifumi * this should be called twice, once with wait == 0 and 32774eedeb75SHisashi Hifumi * once with wait == 1. When wait == 0 is done, all the buffer heads 32784eedeb75SHisashi Hifumi * we write are pinned. 32794eedeb75SHisashi Hifumi * 32804eedeb75SHisashi Hifumi * They are released when wait == 1 is done. 32814eedeb75SHisashi Hifumi * max_mirrors must be the same for both runs, and it indicates how 32824eedeb75SHisashi Hifumi * many supers on this one device should be written. 32834eedeb75SHisashi Hifumi * 32844eedeb75SHisashi Hifumi * max_mirrors == 0 means to write them all. 32854eedeb75SHisashi Hifumi */ 3286a512bbf8SYan Zheng static int write_dev_supers(struct btrfs_device *device, 3287a512bbf8SYan Zheng struct btrfs_super_block *sb, 3288a512bbf8SYan Zheng int do_barriers, int wait, int max_mirrors) 3289a512bbf8SYan Zheng { 3290a512bbf8SYan Zheng struct buffer_head *bh; 3291a512bbf8SYan Zheng int i; 3292a512bbf8SYan Zheng int ret; 3293a512bbf8SYan Zheng int errors = 0; 3294a512bbf8SYan Zheng u32 crc; 3295a512bbf8SYan Zheng u64 bytenr; 3296a512bbf8SYan Zheng 3297a512bbf8SYan Zheng if (max_mirrors == 0) 3298a512bbf8SYan Zheng max_mirrors = BTRFS_SUPER_MIRROR_MAX; 3299a512bbf8SYan Zheng 3300a512bbf8SYan Zheng for (i = 0; i < max_mirrors; i++) { 3301a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 3302935e5cc9SMiao Xie if (bytenr + BTRFS_SUPER_INFO_SIZE >= 3303935e5cc9SMiao Xie device->commit_total_bytes) 3304a512bbf8SYan Zheng break; 3305a512bbf8SYan Zheng 3306a512bbf8SYan Zheng if (wait) { 3307a512bbf8SYan Zheng bh = __find_get_block(device->bdev, bytenr / 4096, 3308a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 3309634554dcSJosef Bacik if (!bh) { 3310634554dcSJosef Bacik errors++; 3311634554dcSJosef Bacik continue; 3312634554dcSJosef Bacik } 3313a512bbf8SYan Zheng wait_on_buffer(bh); 33144eedeb75SHisashi Hifumi if (!buffer_uptodate(bh)) 33154eedeb75SHisashi Hifumi errors++; 33164eedeb75SHisashi Hifumi 33174eedeb75SHisashi Hifumi /* drop our reference */ 33184eedeb75SHisashi Hifumi brelse(bh); 33194eedeb75SHisashi Hifumi 33204eedeb75SHisashi Hifumi /* drop the reference from the wait == 0 run */ 3321a512bbf8SYan Zheng brelse(bh); 3322a512bbf8SYan Zheng continue; 3323a512bbf8SYan Zheng } else { 3324a512bbf8SYan Zheng btrfs_set_super_bytenr(sb, bytenr); 3325a512bbf8SYan Zheng 3326a512bbf8SYan Zheng crc = ~(u32)0; 3327b0496686SLiu Bo crc = btrfs_csum_data((char *)sb + 3328a512bbf8SYan Zheng BTRFS_CSUM_SIZE, crc, 3329a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE - 3330a512bbf8SYan Zheng BTRFS_CSUM_SIZE); 3331a512bbf8SYan Zheng btrfs_csum_final(crc, sb->csum); 3332a512bbf8SYan Zheng 33334eedeb75SHisashi Hifumi /* 33344eedeb75SHisashi Hifumi * one reference for us, and we leave it for the 33354eedeb75SHisashi Hifumi * caller 33364eedeb75SHisashi Hifumi */ 3337a512bbf8SYan Zheng bh = __getblk(device->bdev, bytenr / 4096, 3338a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 3339634554dcSJosef Bacik if (!bh) { 3340efe120a0SFrank Holton printk(KERN_ERR "BTRFS: couldn't get super " 3341634554dcSJosef Bacik "buffer head for bytenr %Lu\n", bytenr); 3342634554dcSJosef Bacik errors++; 3343634554dcSJosef Bacik continue; 3344634554dcSJosef Bacik } 3345634554dcSJosef Bacik 3346a512bbf8SYan Zheng memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 3347a512bbf8SYan Zheng 33484eedeb75SHisashi Hifumi /* one reference for submit_bh */ 3349a512bbf8SYan Zheng get_bh(bh); 33504eedeb75SHisashi Hifumi 33514eedeb75SHisashi Hifumi set_buffer_uptodate(bh); 3352a512bbf8SYan Zheng lock_buffer(bh); 3353a512bbf8SYan Zheng bh->b_end_io = btrfs_end_buffer_write_sync; 3354442a4f63SStefan Behrens bh->b_private = device; 3355a512bbf8SYan Zheng } 3356a512bbf8SYan Zheng 3357387125fcSChris Mason /* 3358387125fcSChris Mason * we fua the first super. The others we allow 3359387125fcSChris Mason * to go down lazy. 3360387125fcSChris Mason */ 3361e8117c26SWang Shilong if (i == 0) 336221adbd5cSStefan Behrens ret = btrfsic_submit_bh(WRITE_FUA, bh); 3363e8117c26SWang Shilong else 3364e8117c26SWang Shilong ret = btrfsic_submit_bh(WRITE_SYNC, bh); 33654eedeb75SHisashi Hifumi if (ret) 3366a512bbf8SYan Zheng errors++; 3367a512bbf8SYan Zheng } 3368a512bbf8SYan Zheng return errors < i ? 0 : -1; 3369a512bbf8SYan Zheng } 3370a512bbf8SYan Zheng 3371387125fcSChris Mason /* 3372387125fcSChris Mason * endio for the write_dev_flush, this will wake anyone waiting 3373387125fcSChris Mason * for the barrier when it is done 3374387125fcSChris Mason */ 33754246a0b6SChristoph Hellwig static void btrfs_end_empty_barrier(struct bio *bio) 3376387125fcSChris Mason { 3377387125fcSChris Mason if (bio->bi_private) 3378387125fcSChris Mason complete(bio->bi_private); 3379387125fcSChris Mason bio_put(bio); 3380387125fcSChris Mason } 3381387125fcSChris Mason 3382387125fcSChris Mason /* 3383387125fcSChris Mason * trigger flushes for one the devices. If you pass wait == 0, the flushes are 3384387125fcSChris Mason * sent down. With wait == 1, it waits for the previous flush. 3385387125fcSChris Mason * 3386387125fcSChris Mason * any device where the flush fails with eopnotsupp are flagged as not-barrier 3387387125fcSChris Mason * capable 3388387125fcSChris Mason */ 3389387125fcSChris Mason static int write_dev_flush(struct btrfs_device *device, int wait) 3390387125fcSChris Mason { 3391387125fcSChris Mason struct bio *bio; 3392387125fcSChris Mason int ret = 0; 3393387125fcSChris Mason 3394387125fcSChris Mason if (device->nobarriers) 3395387125fcSChris Mason return 0; 3396387125fcSChris Mason 3397387125fcSChris Mason if (wait) { 3398387125fcSChris Mason bio = device->flush_bio; 3399387125fcSChris Mason if (!bio) 3400387125fcSChris Mason return 0; 3401387125fcSChris Mason 3402387125fcSChris Mason wait_for_completion(&device->flush_wait); 3403387125fcSChris Mason 34044246a0b6SChristoph Hellwig if (bio->bi_error) { 34054246a0b6SChristoph Hellwig ret = bio->bi_error; 3406442a4f63SStefan Behrens btrfs_dev_stat_inc_and_print(device, 3407442a4f63SStefan Behrens BTRFS_DEV_STAT_FLUSH_ERRS); 3408387125fcSChris Mason } 3409387125fcSChris Mason 3410387125fcSChris Mason /* drop the reference from the wait == 0 run */ 3411387125fcSChris Mason bio_put(bio); 3412387125fcSChris Mason device->flush_bio = NULL; 3413387125fcSChris Mason 3414387125fcSChris Mason return ret; 3415387125fcSChris Mason } 3416387125fcSChris Mason 3417387125fcSChris Mason /* 3418387125fcSChris Mason * one reference for us, and we leave it for the 3419387125fcSChris Mason * caller 3420387125fcSChris Mason */ 34219c017abcSJesper Juhl device->flush_bio = NULL; 34229be3395bSChris Mason bio = btrfs_io_bio_alloc(GFP_NOFS, 0); 3423387125fcSChris Mason if (!bio) 3424387125fcSChris Mason return -ENOMEM; 3425387125fcSChris Mason 3426387125fcSChris Mason bio->bi_end_io = btrfs_end_empty_barrier; 3427387125fcSChris Mason bio->bi_bdev = device->bdev; 3428387125fcSChris Mason init_completion(&device->flush_wait); 3429387125fcSChris Mason bio->bi_private = &device->flush_wait; 3430387125fcSChris Mason device->flush_bio = bio; 3431387125fcSChris Mason 3432387125fcSChris Mason bio_get(bio); 343321adbd5cSStefan Behrens btrfsic_submit_bio(WRITE_FLUSH, bio); 3434387125fcSChris Mason 3435387125fcSChris Mason return 0; 3436387125fcSChris Mason } 3437387125fcSChris Mason 3438387125fcSChris Mason /* 3439387125fcSChris Mason * send an empty flush down to each device in parallel, 3440387125fcSChris Mason * then wait for them 3441387125fcSChris Mason */ 3442387125fcSChris Mason static int barrier_all_devices(struct btrfs_fs_info *info) 3443387125fcSChris Mason { 3444387125fcSChris Mason struct list_head *head; 3445387125fcSChris Mason struct btrfs_device *dev; 34465af3e8ccSStefan Behrens int errors_send = 0; 34475af3e8ccSStefan Behrens int errors_wait = 0; 3448387125fcSChris Mason int ret; 3449387125fcSChris Mason 3450387125fcSChris Mason /* send down all the barriers */ 3451387125fcSChris Mason head = &info->fs_devices->devices; 3452387125fcSChris Mason list_for_each_entry_rcu(dev, head, dev_list) { 3453f88ba6a2SHidetoshi Seto if (dev->missing) 3454f88ba6a2SHidetoshi Seto continue; 3455387125fcSChris Mason if (!dev->bdev) { 34565af3e8ccSStefan Behrens errors_send++; 3457387125fcSChris Mason continue; 3458387125fcSChris Mason } 3459387125fcSChris Mason if (!dev->in_fs_metadata || !dev->writeable) 3460387125fcSChris Mason continue; 3461387125fcSChris Mason 3462387125fcSChris Mason ret = write_dev_flush(dev, 0); 3463387125fcSChris Mason if (ret) 34645af3e8ccSStefan Behrens errors_send++; 3465387125fcSChris Mason } 3466387125fcSChris Mason 3467387125fcSChris Mason /* wait for all the barriers */ 3468387125fcSChris Mason list_for_each_entry_rcu(dev, head, dev_list) { 3469f88ba6a2SHidetoshi Seto if (dev->missing) 3470f88ba6a2SHidetoshi Seto continue; 3471387125fcSChris Mason if (!dev->bdev) { 34725af3e8ccSStefan Behrens errors_wait++; 3473387125fcSChris Mason continue; 3474387125fcSChris Mason } 3475387125fcSChris Mason if (!dev->in_fs_metadata || !dev->writeable) 3476387125fcSChris Mason continue; 3477387125fcSChris Mason 3478387125fcSChris Mason ret = write_dev_flush(dev, 1); 3479387125fcSChris Mason if (ret) 34805af3e8ccSStefan Behrens errors_wait++; 3481387125fcSChris Mason } 34825af3e8ccSStefan Behrens if (errors_send > info->num_tolerated_disk_barrier_failures || 34835af3e8ccSStefan Behrens errors_wait > info->num_tolerated_disk_barrier_failures) 3484387125fcSChris Mason return -EIO; 3485387125fcSChris Mason return 0; 3486387125fcSChris Mason } 3487387125fcSChris Mason 3488943c6e99SZhao Lei int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags) 3489943c6e99SZhao Lei { 3490943c6e99SZhao Lei if ((flags & (BTRFS_BLOCK_GROUP_DUP | 3491943c6e99SZhao Lei BTRFS_BLOCK_GROUP_RAID0 | 3492943c6e99SZhao Lei BTRFS_AVAIL_ALLOC_BIT_SINGLE)) || 3493943c6e99SZhao Lei ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)) 3494943c6e99SZhao Lei return 0; 3495943c6e99SZhao Lei 3496943c6e99SZhao Lei if (flags & (BTRFS_BLOCK_GROUP_RAID1 | 3497943c6e99SZhao Lei BTRFS_BLOCK_GROUP_RAID5 | 3498943c6e99SZhao Lei BTRFS_BLOCK_GROUP_RAID10)) 3499943c6e99SZhao Lei return 1; 3500943c6e99SZhao Lei 3501943c6e99SZhao Lei if (flags & BTRFS_BLOCK_GROUP_RAID6) 3502943c6e99SZhao Lei return 2; 3503943c6e99SZhao Lei 3504943c6e99SZhao Lei pr_warn("BTRFS: unknown raid type: %llu\n", flags); 3505943c6e99SZhao Lei return 0; 3506943c6e99SZhao Lei } 3507943c6e99SZhao Lei 35085af3e8ccSStefan Behrens int btrfs_calc_num_tolerated_disk_barrier_failures( 35095af3e8ccSStefan Behrens struct btrfs_fs_info *fs_info) 35105af3e8ccSStefan Behrens { 35115af3e8ccSStefan Behrens struct btrfs_ioctl_space_info space; 35125af3e8ccSStefan Behrens struct btrfs_space_info *sinfo; 35135af3e8ccSStefan Behrens u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 35145af3e8ccSStefan Behrens BTRFS_BLOCK_GROUP_SYSTEM, 35155af3e8ccSStefan Behrens BTRFS_BLOCK_GROUP_METADATA, 35165af3e8ccSStefan Behrens BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 35175af3e8ccSStefan Behrens int i; 35185af3e8ccSStefan Behrens int c; 35195af3e8ccSStefan Behrens int num_tolerated_disk_barrier_failures = 35205af3e8ccSStefan Behrens (int)fs_info->fs_devices->num_devices; 35215af3e8ccSStefan Behrens 35222c458045SZhao Lei for (i = 0; i < ARRAY_SIZE(types); i++) { 35235af3e8ccSStefan Behrens struct btrfs_space_info *tmp; 35245af3e8ccSStefan Behrens 35255af3e8ccSStefan Behrens sinfo = NULL; 35265af3e8ccSStefan Behrens rcu_read_lock(); 35275af3e8ccSStefan Behrens list_for_each_entry_rcu(tmp, &fs_info->space_info, list) { 35285af3e8ccSStefan Behrens if (tmp->flags == types[i]) { 35295af3e8ccSStefan Behrens sinfo = tmp; 35305af3e8ccSStefan Behrens break; 35315af3e8ccSStefan Behrens } 35325af3e8ccSStefan Behrens } 35335af3e8ccSStefan Behrens rcu_read_unlock(); 35345af3e8ccSStefan Behrens 35355af3e8ccSStefan Behrens if (!sinfo) 35365af3e8ccSStefan Behrens continue; 35375af3e8ccSStefan Behrens 35385af3e8ccSStefan Behrens down_read(&sinfo->groups_sem); 35395af3e8ccSStefan Behrens for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 35405af3e8ccSStefan Behrens u64 flags; 35415af3e8ccSStefan Behrens 35422c458045SZhao Lei if (list_empty(&sinfo->block_groups[c])) 35432c458045SZhao Lei continue; 35442c458045SZhao Lei 35452c458045SZhao Lei btrfs_get_block_group_info(&sinfo->block_groups[c], 35462c458045SZhao Lei &space); 35472c458045SZhao Lei if (space.total_bytes == 0 || space.used_bytes == 0) 35485af3e8ccSStefan Behrens continue; 35495af3e8ccSStefan Behrens flags = space.flags; 3550943c6e99SZhao Lei 3551943c6e99SZhao Lei num_tolerated_disk_barrier_failures = min( 3552943c6e99SZhao Lei num_tolerated_disk_barrier_failures, 3553943c6e99SZhao Lei btrfs_get_num_tolerated_disk_barrier_failures( 3554943c6e99SZhao Lei flags)); 35555af3e8ccSStefan Behrens } 35565af3e8ccSStefan Behrens up_read(&sinfo->groups_sem); 35575af3e8ccSStefan Behrens } 35585af3e8ccSStefan Behrens 35595af3e8ccSStefan Behrens return num_tolerated_disk_barrier_failures; 35605af3e8ccSStefan Behrens } 35615af3e8ccSStefan Behrens 356248a3b636SEric Sandeen static int write_all_supers(struct btrfs_root *root, int max_mirrors) 3563f2984462SChris Mason { 3564e5e9a520SChris Mason struct list_head *head; 3565f2984462SChris Mason struct btrfs_device *dev; 3566a061fc8dSChris Mason struct btrfs_super_block *sb; 3567f2984462SChris Mason struct btrfs_dev_item *dev_item; 3568f2984462SChris Mason int ret; 3569f2984462SChris Mason int do_barriers; 3570a236aed1SChris Mason int max_errors; 3571a236aed1SChris Mason int total_errors = 0; 3572a061fc8dSChris Mason u64 flags; 3573f2984462SChris Mason 3574f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 3575af31f5e5SChris Mason backup_super_roots(root->fs_info); 3576f2984462SChris Mason 35776c41761fSDavid Sterba sb = root->fs_info->super_for_commit; 3578a061fc8dSChris Mason dev_item = &sb->dev_item; 3579e5e9a520SChris Mason 3580174ba509SChris Mason mutex_lock(&root->fs_info->fs_devices->device_list_mutex); 3581e5e9a520SChris Mason head = &root->fs_info->fs_devices->devices; 3582d7306801SFilipe David Borba Manana max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1; 3583387125fcSChris Mason 35845af3e8ccSStefan Behrens if (do_barriers) { 35855af3e8ccSStefan Behrens ret = barrier_all_devices(root->fs_info); 35865af3e8ccSStefan Behrens if (ret) { 35875af3e8ccSStefan Behrens mutex_unlock( 35885af3e8ccSStefan Behrens &root->fs_info->fs_devices->device_list_mutex); 35895af3e8ccSStefan Behrens btrfs_error(root->fs_info, ret, 35905af3e8ccSStefan Behrens "errors while submitting device barriers."); 35915af3e8ccSStefan Behrens return ret; 35925af3e8ccSStefan Behrens } 35935af3e8ccSStefan Behrens } 3594387125fcSChris Mason 35951f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 3596dfe25020SChris Mason if (!dev->bdev) { 3597dfe25020SChris Mason total_errors++; 3598dfe25020SChris Mason continue; 3599dfe25020SChris Mason } 36002b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 3601dfe25020SChris Mason continue; 3602dfe25020SChris Mason 36032b82032cSYan Zheng btrfs_set_stack_device_generation(dev_item, 0); 3604a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 3605a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 36067df69d3eSMiao Xie btrfs_set_stack_device_total_bytes(dev_item, 3607935e5cc9SMiao Xie dev->commit_total_bytes); 3608ce7213c7SMiao Xie btrfs_set_stack_device_bytes_used(dev_item, 3609ce7213c7SMiao Xie dev->commit_bytes_used); 3610a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 3611a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 3612a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 3613a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 36142b82032cSYan Zheng memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 3615a512bbf8SYan Zheng 3616a061fc8dSChris Mason flags = btrfs_super_flags(sb); 3617a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 3618f2984462SChris Mason 3619a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); 3620a236aed1SChris Mason if (ret) 3621a236aed1SChris Mason total_errors++; 3622f2984462SChris Mason } 3623a236aed1SChris Mason if (total_errors > max_errors) { 3624efe120a0SFrank Holton btrfs_err(root->fs_info, "%d errors while writing supers", 3625d397712bSChris Mason total_errors); 3626a724b436SStefan Behrens mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); 362779787eaaSJeff Mahoney 36289d565ba4SStefan Behrens /* FUA is masked off if unsupported and can't be the reason */ 36299d565ba4SStefan Behrens btrfs_error(root->fs_info, -EIO, 36309d565ba4SStefan Behrens "%d errors while writing supers", total_errors); 36319d565ba4SStefan Behrens return -EIO; 3632a236aed1SChris Mason } 3633f2984462SChris Mason 3634a512bbf8SYan Zheng total_errors = 0; 36351f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 3636dfe25020SChris Mason if (!dev->bdev) 3637dfe25020SChris Mason continue; 36382b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 3639dfe25020SChris Mason continue; 3640dfe25020SChris Mason 3641a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); 3642a512bbf8SYan Zheng if (ret) 36431259ab75SChris Mason total_errors++; 3644f2984462SChris Mason } 3645174ba509SChris Mason mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); 3646a236aed1SChris Mason if (total_errors > max_errors) { 364779787eaaSJeff Mahoney btrfs_error(root->fs_info, -EIO, 364879787eaaSJeff Mahoney "%d errors while writing supers", total_errors); 364979787eaaSJeff Mahoney return -EIO; 3650a236aed1SChris Mason } 3651f2984462SChris Mason return 0; 3652f2984462SChris Mason } 3653f2984462SChris Mason 3654a512bbf8SYan Zheng int write_ctree_super(struct btrfs_trans_handle *trans, 3655a512bbf8SYan Zheng struct btrfs_root *root, int max_mirrors) 3656cfaa7295SChris Mason { 3657f570e757SRashika return write_all_supers(root, max_mirrors); 3658cfaa7295SChris Mason } 3659cfaa7295SChris Mason 3660cb517eabSMiao Xie /* Drop a fs root from the radix tree and free it. */ 3661cb517eabSMiao Xie void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 3662cb517eabSMiao Xie struct btrfs_root *root) 36632619ba1fSChris Mason { 36644df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 36652619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 36662619ba1fSChris Mason (unsigned long)root->root_key.objectid); 36674df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 366876dda93cSYan, Zheng 366976dda93cSYan, Zheng if (btrfs_root_refs(&root->root_item) == 0) 367076dda93cSYan, Zheng synchronize_srcu(&fs_info->subvol_srcu); 367176dda93cSYan, Zheng 36721a4319ccSLiu Bo if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) 36733321719eSLiu Bo btrfs_free_log(NULL, root); 36743321719eSLiu Bo 3675faa2dbf0SJosef Bacik if (root->free_ino_pinned) 3676581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_pinned); 3677faa2dbf0SJosef Bacik if (root->free_ino_ctl) 3678581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_ctl); 36794df27c4dSYan, Zheng free_fs_root(root); 36804df27c4dSYan, Zheng } 36814df27c4dSYan, Zheng 36824df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root) 36834df27c4dSYan, Zheng { 368457cdc8dbSDavid Sterba iput(root->ino_cache_inode); 36854df27c4dSYan, Zheng WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); 36861cb048f5SFilipe David Borba Manana btrfs_free_block_rsv(root, root->orphan_block_rsv); 36871cb048f5SFilipe David Borba Manana root->orphan_block_rsv = NULL; 36880ee5dc67SAl Viro if (root->anon_dev) 36890ee5dc67SAl Viro free_anon_bdev(root->anon_dev); 36908257b2dcSMiao Xie if (root->subv_writers) 36918257b2dcSMiao Xie btrfs_free_subvolume_writers(root->subv_writers); 36925f39d397SChris Mason free_extent_buffer(root->node); 36935f39d397SChris Mason free_extent_buffer(root->commit_root); 3694581bb050SLi Zefan kfree(root->free_ino_ctl); 3695581bb050SLi Zefan kfree(root->free_ino_pinned); 369658176a96SJosef Bacik kfree(root->name); 3697b0feb9d9SMiao Xie btrfs_put_fs_root(root); 36982619ba1fSChris Mason } 36992619ba1fSChris Mason 3700cb517eabSMiao Xie void btrfs_free_fs_root(struct btrfs_root *root) 3701cb517eabSMiao Xie { 3702cb517eabSMiao Xie free_fs_root(root); 3703eb60ceacSChris Mason } 3704eb60ceacSChris Mason 3705c146afadSYan Zheng int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) 3706c146afadSYan Zheng { 3707c146afadSYan Zheng u64 root_objectid = 0; 3708c146afadSYan Zheng struct btrfs_root *gang[8]; 370965d33fd7SQu Wenruo int i = 0; 371065d33fd7SQu Wenruo int err = 0; 371165d33fd7SQu Wenruo unsigned int ret = 0; 371265d33fd7SQu Wenruo int index; 3713c146afadSYan Zheng 3714c146afadSYan Zheng while (1) { 371565d33fd7SQu Wenruo index = srcu_read_lock(&fs_info->subvol_srcu); 3716c146afadSYan Zheng ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 3717c146afadSYan Zheng (void **)gang, root_objectid, 3718c146afadSYan Zheng ARRAY_SIZE(gang)); 371965d33fd7SQu Wenruo if (!ret) { 372065d33fd7SQu Wenruo srcu_read_unlock(&fs_info->subvol_srcu, index); 3721c146afadSYan Zheng break; 372265d33fd7SQu Wenruo } 37235d4f98a2SYan Zheng root_objectid = gang[ret - 1]->root_key.objectid + 1; 372466b4ffd1SJosef Bacik 372565d33fd7SQu Wenruo for (i = 0; i < ret; i++) { 372665d33fd7SQu Wenruo /* Avoid to grab roots in dead_roots */ 372765d33fd7SQu Wenruo if (btrfs_root_refs(&gang[i]->root_item) == 0) { 372865d33fd7SQu Wenruo gang[i] = NULL; 372965d33fd7SQu Wenruo continue; 373065d33fd7SQu Wenruo } 373165d33fd7SQu Wenruo /* grab all the search result for later use */ 373265d33fd7SQu Wenruo gang[i] = btrfs_grab_fs_root(gang[i]); 373365d33fd7SQu Wenruo } 373465d33fd7SQu Wenruo srcu_read_unlock(&fs_info->subvol_srcu, index); 373565d33fd7SQu Wenruo 373665d33fd7SQu Wenruo for (i = 0; i < ret; i++) { 373765d33fd7SQu Wenruo if (!gang[i]) 373865d33fd7SQu Wenruo continue; 3739c146afadSYan Zheng root_objectid = gang[i]->root_key.objectid; 374066b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(gang[i]); 374166b4ffd1SJosef Bacik if (err) 374265d33fd7SQu Wenruo break; 374365d33fd7SQu Wenruo btrfs_put_fs_root(gang[i]); 3744c146afadSYan Zheng } 3745c146afadSYan Zheng root_objectid++; 3746c146afadSYan Zheng } 374765d33fd7SQu Wenruo 374865d33fd7SQu Wenruo /* release the uncleaned roots due to error */ 374965d33fd7SQu Wenruo for (; i < ret; i++) { 375065d33fd7SQu Wenruo if (gang[i]) 375165d33fd7SQu Wenruo btrfs_put_fs_root(gang[i]); 375265d33fd7SQu Wenruo } 375365d33fd7SQu Wenruo return err; 3754c146afadSYan Zheng } 3755c146afadSYan Zheng 3756c146afadSYan Zheng int btrfs_commit_super(struct btrfs_root *root) 3757c146afadSYan Zheng { 3758c146afadSYan Zheng struct btrfs_trans_handle *trans; 3759c146afadSYan Zheng 3760c146afadSYan Zheng mutex_lock(&root->fs_info->cleaner_mutex); 376124bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 3762c146afadSYan Zheng mutex_unlock(&root->fs_info->cleaner_mutex); 37639d1a2a3aSDavid Sterba wake_up_process(root->fs_info->cleaner_kthread); 3764c71bf099SYan, Zheng 3765c71bf099SYan, Zheng /* wait until ongoing cleanup work done */ 3766c71bf099SYan, Zheng down_write(&root->fs_info->cleanup_work_sem); 3767c71bf099SYan, Zheng up_write(&root->fs_info->cleanup_work_sem); 3768c71bf099SYan, Zheng 37697a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 37703612b495STsutomu Itoh if (IS_ERR(trans)) 37713612b495STsutomu Itoh return PTR_ERR(trans); 3772d52c1bccSLiu Bo return btrfs_commit_transaction(trans, root); 3773c146afadSYan Zheng } 3774c146afadSYan Zheng 37753abdbd78SDavid Sterba void close_ctree(struct btrfs_root *root) 3776eb60ceacSChris Mason { 37770f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 3778c146afadSYan Zheng int ret; 3779e089f05cSChris Mason 3780facda1e7SChris Mason fs_info->closing = 1; 3781a2135011SChris Mason smp_mb(); 3782a2135011SChris Mason 3783803b2f54SStefan Behrens /* wait for the uuid_scan task to finish */ 3784803b2f54SStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 3785803b2f54SStefan Behrens /* avoid complains from lockdep et al., set sem back to initial state */ 3786803b2f54SStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 3787803b2f54SStefan Behrens 3788837d5b6eSIlya Dryomov /* pause restriper - we want to resume on mount */ 3789aa1b8cd4SStefan Behrens btrfs_pause_balance(fs_info); 3790837d5b6eSIlya Dryomov 37918dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 37928dabb742SStefan Behrens 3793aa1b8cd4SStefan Behrens btrfs_scrub_cancel(fs_info); 37944cb5300bSChris Mason 37954cb5300bSChris Mason /* wait for any defraggers to finish */ 37964cb5300bSChris Mason wait_event(fs_info->transaction_wait, 37974cb5300bSChris Mason (atomic_read(&fs_info->defrag_running) == 0)); 37984cb5300bSChris Mason 37994cb5300bSChris Mason /* clear out the rbtree of defraggable inodes */ 380026176e7cSMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 38014cb5300bSChris Mason 380221c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 380321c7e756SMiao Xie 3804c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 3805e44163e1SJeff Mahoney /* 3806e44163e1SJeff Mahoney * If the cleaner thread is stopped and there are 3807e44163e1SJeff Mahoney * block groups queued for removal, the deletion will be 3808e44163e1SJeff Mahoney * skipped when we quit the cleaner thread. 3809e44163e1SJeff Mahoney */ 3810e44163e1SJeff Mahoney btrfs_delete_unused_bgs(root->fs_info); 3811e44163e1SJeff Mahoney 3812c146afadSYan Zheng ret = btrfs_commit_super(root); 3813d397712bSChris Mason if (ret) 381404892340SEric Sandeen btrfs_err(fs_info, "commit super ret %d", ret); 3815c146afadSYan Zheng } 3816ed2ff2cbSChris Mason 381787533c47SMiao Xie if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) 381868ce9682SStefan Behrens btrfs_error_commit_super(root); 3819acce952bSliubo 3820e3029d9fSAl Viro kthread_stop(fs_info->transaction_kthread); 3821e3029d9fSAl Viro kthread_stop(fs_info->cleaner_kthread); 38228929ecfaSYan, Zheng 3823f25784b3SYan Zheng fs_info->closing = 2; 3824f25784b3SYan Zheng smp_mb(); 3825f25784b3SYan Zheng 382604892340SEric Sandeen btrfs_free_qgroup_config(fs_info); 3827bcef60f2SArne Jansen 3828963d678bSMiao Xie if (percpu_counter_sum(&fs_info->delalloc_bytes)) { 382904892340SEric Sandeen btrfs_info(fs_info, "at unmount delalloc count %lld", 3830963d678bSMiao Xie percpu_counter_sum(&fs_info->delalloc_bytes)); 3831b0c68f8bSChris Mason } 383231153d81SYan Zheng 38335ac1d209SJeff Mahoney btrfs_sysfs_remove_one(fs_info); 3834b7c35e81SAnand Jain btrfs_sysfs_remove_fsid(fs_info->fs_devices); 38355ac1d209SJeff Mahoney 3836faa2dbf0SJosef Bacik btrfs_free_fs_roots(fs_info); 3837d10c5f31SChris Mason 38381a4319ccSLiu Bo btrfs_put_block_group_cache(fs_info); 38391a4319ccSLiu Bo 38402b1360daSJosef Bacik btrfs_free_block_groups(fs_info); 38412b1360daSJosef Bacik 3842de348ee0SWang Shilong /* 3843de348ee0SWang Shilong * we must make sure there is not any read request to 3844de348ee0SWang Shilong * submit after we stopping all workers. 3845de348ee0SWang Shilong */ 3846de348ee0SWang Shilong invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 384796192499SJosef Bacik btrfs_stop_all_workers(fs_info); 384896192499SJosef Bacik 384947ab2a6cSJosef Bacik fs_info->open = 0; 385013e6c37bSJosef Bacik free_root_pointers(fs_info, 1); 38519ad6b7bcSChris Mason 385213e6c37bSJosef Bacik iput(fs_info->btree_inode); 3853d6bfde87SChris Mason 385421adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 385521adbd5cSStefan Behrens if (btrfs_test_opt(root, CHECK_INTEGRITY)) 385621adbd5cSStefan Behrens btrfsic_unmount(root, fs_info->fs_devices); 385721adbd5cSStefan Behrens #endif 385821adbd5cSStefan Behrens 3859dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 38600b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 3861b248a415SChris Mason 3862e2d84521SMiao Xie percpu_counter_destroy(&fs_info->dirty_metadata_bytes); 3863963d678bSMiao Xie percpu_counter_destroy(&fs_info->delalloc_bytes); 3864c404e0dcSMiao Xie percpu_counter_destroy(&fs_info->bio_counter); 386504160088SChris Mason bdi_destroy(&fs_info->bdi); 386676dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 38670b86a832SChris Mason 386853b381b3SDavid Woodhouse btrfs_free_stripe_hash_table(fs_info); 386953b381b3SDavid Woodhouse 3870cdfb080eSChris Mason __btrfs_free_block_rsv(root->orphan_block_rsv); 38711cb048f5SFilipe David Borba Manana root->orphan_block_rsv = NULL; 387204216820SFilipe Manana 387304216820SFilipe Manana lock_chunks(root); 387404216820SFilipe Manana while (!list_empty(&fs_info->pinned_chunks)) { 387504216820SFilipe Manana struct extent_map *em; 387604216820SFilipe Manana 387704216820SFilipe Manana em = list_first_entry(&fs_info->pinned_chunks, 387804216820SFilipe Manana struct extent_map, list); 387904216820SFilipe Manana list_del_init(&em->list); 388004216820SFilipe Manana free_extent_map(em); 388104216820SFilipe Manana } 388204216820SFilipe Manana unlock_chunks(root); 3883eb60ceacSChris Mason } 3884eb60ceacSChris Mason 3885b9fab919SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 3886b9fab919SChris Mason int atomic) 3887ccd467d6SChris Mason { 38881259ab75SChris Mason int ret; 3889727011e0SChris Mason struct inode *btree_inode = buf->pages[0]->mapping->host; 38901259ab75SChris Mason 38910b32f4bbSJosef Bacik ret = extent_buffer_uptodate(buf); 38921259ab75SChris Mason if (!ret) 38931259ab75SChris Mason return ret; 38941259ab75SChris Mason 38951259ab75SChris Mason ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, 3896b9fab919SChris Mason parent_transid, atomic); 3897b9fab919SChris Mason if (ret == -EAGAIN) 3898b9fab919SChris Mason return ret; 38991259ab75SChris Mason return !ret; 39005f39d397SChris Mason } 39016702ed49SChris Mason 39025f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 39035f39d397SChris Mason { 39040b32f4bbSJosef Bacik return set_extent_buffer_uptodate(buf); 39055f39d397SChris Mason } 39065f39d397SChris Mason 39075f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 39085f39d397SChris Mason { 390906ea65a3SJosef Bacik struct btrfs_root *root; 39105f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 3911b9473439SChris Mason int was_dirty; 3912b4ce94deSChris Mason 391306ea65a3SJosef Bacik #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 391406ea65a3SJosef Bacik /* 391506ea65a3SJosef Bacik * This is a fast path so only do this check if we have sanity tests 391606ea65a3SJosef Bacik * enabled. Normal people shouldn't be marking dummy buffers as dirty 391706ea65a3SJosef Bacik * outside of the sanity tests. 391806ea65a3SJosef Bacik */ 391906ea65a3SJosef Bacik if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &buf->bflags))) 392006ea65a3SJosef Bacik return; 392106ea65a3SJosef Bacik #endif 392206ea65a3SJosef Bacik root = BTRFS_I(buf->pages[0]->mapping->host)->root; 3923b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 392431b1a2bdSJulia Lawall if (transid != root->fs_info->generation) 392531b1a2bdSJulia Lawall WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, " 3926d397712bSChris Mason "found %llu running %llu\n", 3927c1c9ff7cSGeert Uytterhoeven buf->start, transid, root->fs_info->generation); 39280b32f4bbSJosef Bacik was_dirty = set_extent_buffer_dirty(buf); 3929e2d84521SMiao Xie if (!was_dirty) 3930e2d84521SMiao Xie __percpu_counter_add(&root->fs_info->dirty_metadata_bytes, 3931e2d84521SMiao Xie buf->len, 3932e2d84521SMiao Xie root->fs_info->dirty_metadata_batch); 39331f21ef0aSFilipe Manana #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 39341f21ef0aSFilipe Manana if (btrfs_header_level(buf) == 0 && check_leaf(root, buf)) { 39351f21ef0aSFilipe Manana btrfs_print_leaf(root, buf); 39361f21ef0aSFilipe Manana ASSERT(0); 39371f21ef0aSFilipe Manana } 39381f21ef0aSFilipe Manana #endif 3939eb60ceacSChris Mason } 3940eb60ceacSChris Mason 3941b53d3f5dSLiu Bo static void __btrfs_btree_balance_dirty(struct btrfs_root *root, 3942b53d3f5dSLiu Bo int flush_delayed) 394335b7e476SChris Mason { 3944188de649SChris Mason /* 3945188de649SChris Mason * looks as though older kernels can get into trouble with 3946188de649SChris Mason * this code, they end up stuck in balance_dirty_pages forever 3947188de649SChris Mason */ 3948e2d84521SMiao Xie int ret; 3949d6bfde87SChris Mason 39506933c02eSJens Axboe if (current->flags & PF_MEMALLOC) 3951d6bfde87SChris Mason return; 3952d6bfde87SChris Mason 3953b53d3f5dSLiu Bo if (flush_delayed) 395416cdcec7SMiao Xie btrfs_balance_delayed_items(root); 395516cdcec7SMiao Xie 3956e2d84521SMiao Xie ret = percpu_counter_compare(&root->fs_info->dirty_metadata_bytes, 3957e2d84521SMiao Xie BTRFS_DIRTY_METADATA_THRESH); 3958e2d84521SMiao Xie if (ret > 0) { 3959d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited( 3960d0e1d66bSNamjae Jeon root->fs_info->btree_inode->i_mapping); 396116cdcec7SMiao Xie } 396216cdcec7SMiao Xie return; 396316cdcec7SMiao Xie } 396416cdcec7SMiao Xie 3965b53d3f5dSLiu Bo void btrfs_btree_balance_dirty(struct btrfs_root *root) 396616cdcec7SMiao Xie { 3967b53d3f5dSLiu Bo __btrfs_btree_balance_dirty(root, 1); 396835b7e476SChris Mason } 3969b53d3f5dSLiu Bo 3970b53d3f5dSLiu Bo void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root) 3971b53d3f5dSLiu Bo { 3972b53d3f5dSLiu Bo __btrfs_btree_balance_dirty(root, 0); 3973d6bfde87SChris Mason } 39746b80053dSChris Mason 3975ca7a79adSChris Mason int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 39766b80053dSChris Mason { 3977727011e0SChris Mason struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root; 39780b32f4bbSJosef Bacik return btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 39796b80053dSChris Mason } 39800da5468fSChris Mason 3981fcd1f065SDavid Sterba static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, 3982acce952bSliubo int read_only) 3983acce952bSliubo { 3984c926093eSDavid Sterba struct btrfs_super_block *sb = fs_info->super_copy; 3985c926093eSDavid Sterba int ret = 0; 3986c926093eSDavid Sterba 398721e7626bSDavid Sterba if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) { 398821e7626bSDavid Sterba printk(KERN_ERR "BTRFS: tree_root level too big: %d >= %d\n", 398921e7626bSDavid Sterba btrfs_super_root_level(sb), BTRFS_MAX_LEVEL); 3990c926093eSDavid Sterba ret = -EINVAL; 3991c926093eSDavid Sterba } 399221e7626bSDavid Sterba if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) { 399321e7626bSDavid Sterba printk(KERN_ERR "BTRFS: chunk_root level too big: %d >= %d\n", 399421e7626bSDavid Sterba btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL); 3995c926093eSDavid Sterba ret = -EINVAL; 3996c926093eSDavid Sterba } 399721e7626bSDavid Sterba if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) { 399821e7626bSDavid Sterba printk(KERN_ERR "BTRFS: log_root level too big: %d >= %d\n", 399921e7626bSDavid Sterba btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL); 4000c926093eSDavid Sterba ret = -EINVAL; 4001c926093eSDavid Sterba } 4002c926093eSDavid Sterba 40031104a885SDavid Sterba /* 4004c926093eSDavid Sterba * The common minimum, we don't know if we can trust the nodesize/sectorsize 4005c926093eSDavid Sterba * items yet, they'll be verified later. Issue just a warning. 40061104a885SDavid Sterba */ 400721e7626bSDavid Sterba if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) 4008c926093eSDavid Sterba printk(KERN_WARNING "BTRFS: tree_root block unaligned: %llu\n", 4009cd743facSDavid Sterba btrfs_super_root(sb)); 401021e7626bSDavid Sterba if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) 4011cd743facSDavid Sterba printk(KERN_WARNING "BTRFS: chunk_root block unaligned: %llu\n", 4012cd743facSDavid Sterba btrfs_super_chunk_root(sb)); 401321e7626bSDavid Sterba if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) 4014cd743facSDavid Sterba printk(KERN_WARNING "BTRFS: log_root block unaligned: %llu\n", 401521e7626bSDavid Sterba btrfs_super_log_root(sb)); 4016c926093eSDavid Sterba 401775d6ad38SDavid Sterba /* 401875d6ad38SDavid Sterba * Check the lower bound, the alignment and other constraints are 401975d6ad38SDavid Sterba * checked later. 402075d6ad38SDavid Sterba */ 402175d6ad38SDavid Sterba if (btrfs_super_nodesize(sb) < 4096) { 402275d6ad38SDavid Sterba printk(KERN_ERR "BTRFS: nodesize too small: %u < 4096\n", 402375d6ad38SDavid Sterba btrfs_super_nodesize(sb)); 402475d6ad38SDavid Sterba ret = -EINVAL; 402575d6ad38SDavid Sterba } 402675d6ad38SDavid Sterba if (btrfs_super_sectorsize(sb) < 4096) { 402775d6ad38SDavid Sterba printk(KERN_ERR "BTRFS: sectorsize too small: %u < 4096\n", 402875d6ad38SDavid Sterba btrfs_super_sectorsize(sb)); 402975d6ad38SDavid Sterba ret = -EINVAL; 403075d6ad38SDavid Sterba } 403175d6ad38SDavid Sterba 4032c926093eSDavid Sterba if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) { 4033c926093eSDavid Sterba printk(KERN_ERR "BTRFS: dev_item UUID does not match fsid: %pU != %pU\n", 4034c926093eSDavid Sterba fs_info->fsid, sb->dev_item.fsid); 4035c926093eSDavid Sterba ret = -EINVAL; 4036c926093eSDavid Sterba } 4037c926093eSDavid Sterba 4038c926093eSDavid Sterba /* 4039c926093eSDavid Sterba * Hint to catch really bogus numbers, bitflips or so, more exact checks are 4040c926093eSDavid Sterba * done later 4041c926093eSDavid Sterba */ 404221e7626bSDavid Sterba if (btrfs_super_num_devices(sb) > (1UL << 31)) 4043c926093eSDavid Sterba printk(KERN_WARNING "BTRFS: suspicious number of devices: %llu\n", 404421e7626bSDavid Sterba btrfs_super_num_devices(sb)); 404575d6ad38SDavid Sterba if (btrfs_super_num_devices(sb) == 0) { 404675d6ad38SDavid Sterba printk(KERN_ERR "BTRFS: number of devices is 0\n"); 404775d6ad38SDavid Sterba ret = -EINVAL; 404875d6ad38SDavid Sterba } 4049c926093eSDavid Sterba 405021e7626bSDavid Sterba if (btrfs_super_bytenr(sb) != BTRFS_SUPER_INFO_OFFSET) { 4051c926093eSDavid Sterba printk(KERN_ERR "BTRFS: super offset mismatch %llu != %u\n", 405221e7626bSDavid Sterba btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET); 4053c926093eSDavid Sterba ret = -EINVAL; 4054c926093eSDavid Sterba } 4055c926093eSDavid Sterba 4056c926093eSDavid Sterba /* 4057ce7fca5fSDavid Sterba * Obvious sys_chunk_array corruptions, it must hold at least one key 4058ce7fca5fSDavid Sterba * and one chunk 4059ce7fca5fSDavid Sterba */ 4060ce7fca5fSDavid Sterba if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) { 4061ce7fca5fSDavid Sterba printk(KERN_ERR "BTRFS: system chunk array too big %u > %u\n", 4062ce7fca5fSDavid Sterba btrfs_super_sys_array_size(sb), 4063ce7fca5fSDavid Sterba BTRFS_SYSTEM_CHUNK_ARRAY_SIZE); 4064ce7fca5fSDavid Sterba ret = -EINVAL; 4065ce7fca5fSDavid Sterba } 4066ce7fca5fSDavid Sterba if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key) 4067ce7fca5fSDavid Sterba + sizeof(struct btrfs_chunk)) { 4068d2207129SFabian Frederick printk(KERN_ERR "BTRFS: system chunk array too small %u < %zu\n", 4069ce7fca5fSDavid Sterba btrfs_super_sys_array_size(sb), 4070ce7fca5fSDavid Sterba sizeof(struct btrfs_disk_key) 4071ce7fca5fSDavid Sterba + sizeof(struct btrfs_chunk)); 4072ce7fca5fSDavid Sterba ret = -EINVAL; 4073ce7fca5fSDavid Sterba } 4074ce7fca5fSDavid Sterba 4075ce7fca5fSDavid Sterba /* 4076c926093eSDavid Sterba * The generation is a global counter, we'll trust it more than the others 4077c926093eSDavid Sterba * but it's still possible that it's the one that's wrong. 4078c926093eSDavid Sterba */ 407921e7626bSDavid Sterba if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb)) 4080c926093eSDavid Sterba printk(KERN_WARNING 4081c926093eSDavid Sterba "BTRFS: suspicious: generation < chunk_root_generation: %llu < %llu\n", 408221e7626bSDavid Sterba btrfs_super_generation(sb), btrfs_super_chunk_root_generation(sb)); 408321e7626bSDavid Sterba if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb) 408421e7626bSDavid Sterba && btrfs_super_cache_generation(sb) != (u64)-1) 4085c926093eSDavid Sterba printk(KERN_WARNING 4086c926093eSDavid Sterba "BTRFS: suspicious: generation < cache_generation: %llu < %llu\n", 408721e7626bSDavid Sterba btrfs_super_generation(sb), btrfs_super_cache_generation(sb)); 4088c926093eSDavid Sterba 4089c926093eSDavid Sterba return ret; 4090fcd1f065SDavid Sterba } 4091fcd1f065SDavid Sterba 409248a3b636SEric Sandeen static void btrfs_error_commit_super(struct btrfs_root *root) 4093acce952bSliubo { 4094acce952bSliubo mutex_lock(&root->fs_info->cleaner_mutex); 4095acce952bSliubo btrfs_run_delayed_iputs(root); 4096acce952bSliubo mutex_unlock(&root->fs_info->cleaner_mutex); 4097acce952bSliubo 4098acce952bSliubo down_write(&root->fs_info->cleanup_work_sem); 4099acce952bSliubo up_write(&root->fs_info->cleanup_work_sem); 4100acce952bSliubo 4101acce952bSliubo /* cleanup FS via transaction */ 4102acce952bSliubo btrfs_cleanup_transaction(root); 4103acce952bSliubo } 4104acce952bSliubo 4105143bede5SJeff Mahoney static void btrfs_destroy_ordered_extents(struct btrfs_root *root) 4106acce952bSliubo { 4107acce952bSliubo struct btrfs_ordered_extent *ordered; 4108acce952bSliubo 4109199c2a9cSMiao Xie spin_lock(&root->ordered_extent_lock); 4110779880efSJosef Bacik /* 4111779880efSJosef Bacik * This will just short circuit the ordered completion stuff which will 4112779880efSJosef Bacik * make sure the ordered extent gets properly cleaned up. 4113779880efSJosef Bacik */ 4114199c2a9cSMiao Xie list_for_each_entry(ordered, &root->ordered_extents, 4115779880efSJosef Bacik root_extent_list) 4116779880efSJosef Bacik set_bit(BTRFS_ORDERED_IOERR, &ordered->flags); 4117199c2a9cSMiao Xie spin_unlock(&root->ordered_extent_lock); 4118199c2a9cSMiao Xie } 4119199c2a9cSMiao Xie 4120199c2a9cSMiao Xie static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info) 4121199c2a9cSMiao Xie { 4122199c2a9cSMiao Xie struct btrfs_root *root; 4123199c2a9cSMiao Xie struct list_head splice; 4124199c2a9cSMiao Xie 4125199c2a9cSMiao Xie INIT_LIST_HEAD(&splice); 4126199c2a9cSMiao Xie 4127199c2a9cSMiao Xie spin_lock(&fs_info->ordered_root_lock); 4128199c2a9cSMiao Xie list_splice_init(&fs_info->ordered_roots, &splice); 4129199c2a9cSMiao Xie while (!list_empty(&splice)) { 4130199c2a9cSMiao Xie root = list_first_entry(&splice, struct btrfs_root, 4131199c2a9cSMiao Xie ordered_root); 41321de2cfdeSJosef Bacik list_move_tail(&root->ordered_root, 41331de2cfdeSJosef Bacik &fs_info->ordered_roots); 4134199c2a9cSMiao Xie 41352a85d9caSLiu Bo spin_unlock(&fs_info->ordered_root_lock); 4136199c2a9cSMiao Xie btrfs_destroy_ordered_extents(root); 4137199c2a9cSMiao Xie 41382a85d9caSLiu Bo cond_resched(); 41392a85d9caSLiu Bo spin_lock(&fs_info->ordered_root_lock); 4140199c2a9cSMiao Xie } 4141199c2a9cSMiao Xie spin_unlock(&fs_info->ordered_root_lock); 4142acce952bSliubo } 4143acce952bSliubo 414435a3621bSStefan Behrens static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, 4145acce952bSliubo struct btrfs_root *root) 4146acce952bSliubo { 4147acce952bSliubo struct rb_node *node; 4148acce952bSliubo struct btrfs_delayed_ref_root *delayed_refs; 4149acce952bSliubo struct btrfs_delayed_ref_node *ref; 4150acce952bSliubo int ret = 0; 4151acce952bSliubo 4152acce952bSliubo delayed_refs = &trans->delayed_refs; 4153acce952bSliubo 4154acce952bSliubo spin_lock(&delayed_refs->lock); 4155d7df2c79SJosef Bacik if (atomic_read(&delayed_refs->num_entries) == 0) { 4156cfece4dbSDavid Sterba spin_unlock(&delayed_refs->lock); 4157efe120a0SFrank Holton btrfs_info(root->fs_info, "delayed_refs has NO entry"); 4158acce952bSliubo return ret; 4159acce952bSliubo } 4160acce952bSliubo 4161d7df2c79SJosef Bacik while ((node = rb_first(&delayed_refs->href_root)) != NULL) { 4162d7df2c79SJosef Bacik struct btrfs_delayed_ref_head *head; 4163c6fc2454SQu Wenruo struct btrfs_delayed_ref_node *tmp; 4164e78417d1SJosef Bacik bool pin_bytes = false; 4165acce952bSliubo 4166d7df2c79SJosef Bacik head = rb_entry(node, struct btrfs_delayed_ref_head, 4167d7df2c79SJosef Bacik href_node); 4168b939d1abSJosef Bacik if (!mutex_trylock(&head->mutex)) { 4169d7df2c79SJosef Bacik atomic_inc(&head->node.refs); 417079787eaaSJeff Mahoney spin_unlock(&delayed_refs->lock); 4171b939d1abSJosef Bacik 4172acce952bSliubo mutex_lock(&head->mutex); 4173b939d1abSJosef Bacik mutex_unlock(&head->mutex); 4174d7df2c79SJosef Bacik btrfs_put_delayed_ref(&head->node); 4175e18fca73SJosef Bacik spin_lock(&delayed_refs->lock); 4176b939d1abSJosef Bacik continue; 4177b939d1abSJosef Bacik } 4178d7df2c79SJosef Bacik spin_lock(&head->lock); 4179c6fc2454SQu Wenruo list_for_each_entry_safe_reverse(ref, tmp, &head->ref_list, 4180c6fc2454SQu Wenruo list) { 4181d7df2c79SJosef Bacik ref->in_tree = 0; 4182c6fc2454SQu Wenruo list_del(&ref->list); 4183d7df2c79SJosef Bacik atomic_dec(&delayed_refs->num_entries); 4184d7df2c79SJosef Bacik btrfs_put_delayed_ref(ref); 4185d7df2c79SJosef Bacik } 418654067ae9SJosef Bacik if (head->must_insert_reserved) 4187e78417d1SJosef Bacik pin_bytes = true; 418878a6184aSMiao Xie btrfs_free_delayed_extent_op(head->extent_op); 4189acce952bSliubo delayed_refs->num_heads--; 4190d7df2c79SJosef Bacik if (head->processing == 0) 4191acce952bSliubo delayed_refs->num_heads_ready--; 4192d7df2c79SJosef Bacik atomic_dec(&delayed_refs->num_entries); 4193d7df2c79SJosef Bacik head->node.in_tree = 0; 4194c46effa6SLiu Bo rb_erase(&head->href_node, &delayed_refs->href_root); 4195d7df2c79SJosef Bacik spin_unlock(&head->lock); 4196acce952bSliubo spin_unlock(&delayed_refs->lock); 4197e78417d1SJosef Bacik mutex_unlock(&head->mutex); 4198acce952bSliubo 4199d7df2c79SJosef Bacik if (pin_bytes) 4200d7df2c79SJosef Bacik btrfs_pin_extent(root, head->node.bytenr, 4201d7df2c79SJosef Bacik head->node.num_bytes, 1); 4202d7df2c79SJosef Bacik btrfs_put_delayed_ref(&head->node); 4203acce952bSliubo cond_resched(); 4204acce952bSliubo spin_lock(&delayed_refs->lock); 4205acce952bSliubo } 4206acce952bSliubo 4207acce952bSliubo spin_unlock(&delayed_refs->lock); 4208acce952bSliubo 4209acce952bSliubo return ret; 4210acce952bSliubo } 4211acce952bSliubo 4212143bede5SJeff Mahoney static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root) 4213acce952bSliubo { 4214acce952bSliubo struct btrfs_inode *btrfs_inode; 4215acce952bSliubo struct list_head splice; 4216acce952bSliubo 4217acce952bSliubo INIT_LIST_HEAD(&splice); 4218acce952bSliubo 4219eb73c1b7SMiao Xie spin_lock(&root->delalloc_lock); 4220eb73c1b7SMiao Xie list_splice_init(&root->delalloc_inodes, &splice); 4221acce952bSliubo 4222acce952bSliubo while (!list_empty(&splice)) { 4223eb73c1b7SMiao Xie btrfs_inode = list_first_entry(&splice, struct btrfs_inode, 4224acce952bSliubo delalloc_inodes); 4225acce952bSliubo 4226acce952bSliubo list_del_init(&btrfs_inode->delalloc_inodes); 4227df0af1a5SMiao Xie clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, 4228df0af1a5SMiao Xie &btrfs_inode->runtime_flags); 4229eb73c1b7SMiao Xie spin_unlock(&root->delalloc_lock); 4230acce952bSliubo 4231acce952bSliubo btrfs_invalidate_inodes(btrfs_inode->root); 4232b216cbfbSMiao Xie 4233eb73c1b7SMiao Xie spin_lock(&root->delalloc_lock); 4234acce952bSliubo } 4235acce952bSliubo 4236eb73c1b7SMiao Xie spin_unlock(&root->delalloc_lock); 4237eb73c1b7SMiao Xie } 4238eb73c1b7SMiao Xie 4239eb73c1b7SMiao Xie static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info) 4240eb73c1b7SMiao Xie { 4241eb73c1b7SMiao Xie struct btrfs_root *root; 4242eb73c1b7SMiao Xie struct list_head splice; 4243eb73c1b7SMiao Xie 4244eb73c1b7SMiao Xie INIT_LIST_HEAD(&splice); 4245eb73c1b7SMiao Xie 4246eb73c1b7SMiao Xie spin_lock(&fs_info->delalloc_root_lock); 4247eb73c1b7SMiao Xie list_splice_init(&fs_info->delalloc_roots, &splice); 4248eb73c1b7SMiao Xie while (!list_empty(&splice)) { 4249eb73c1b7SMiao Xie root = list_first_entry(&splice, struct btrfs_root, 4250eb73c1b7SMiao Xie delalloc_root); 4251eb73c1b7SMiao Xie list_del_init(&root->delalloc_root); 4252eb73c1b7SMiao Xie root = btrfs_grab_fs_root(root); 4253eb73c1b7SMiao Xie BUG_ON(!root); 4254eb73c1b7SMiao Xie spin_unlock(&fs_info->delalloc_root_lock); 4255eb73c1b7SMiao Xie 4256eb73c1b7SMiao Xie btrfs_destroy_delalloc_inodes(root); 4257eb73c1b7SMiao Xie btrfs_put_fs_root(root); 4258eb73c1b7SMiao Xie 4259eb73c1b7SMiao Xie spin_lock(&fs_info->delalloc_root_lock); 4260eb73c1b7SMiao Xie } 4261eb73c1b7SMiao Xie spin_unlock(&fs_info->delalloc_root_lock); 4262acce952bSliubo } 4263acce952bSliubo 4264acce952bSliubo static int btrfs_destroy_marked_extents(struct btrfs_root *root, 4265acce952bSliubo struct extent_io_tree *dirty_pages, 4266acce952bSliubo int mark) 4267acce952bSliubo { 4268acce952bSliubo int ret; 4269acce952bSliubo struct extent_buffer *eb; 4270acce952bSliubo u64 start = 0; 4271acce952bSliubo u64 end; 4272acce952bSliubo 4273acce952bSliubo while (1) { 4274acce952bSliubo ret = find_first_extent_bit(dirty_pages, start, &start, &end, 4275e6138876SJosef Bacik mark, NULL); 4276acce952bSliubo if (ret) 4277acce952bSliubo break; 4278acce952bSliubo 4279acce952bSliubo clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); 4280acce952bSliubo while (start <= end) { 428101d58472SDaniel Dressler eb = btrfs_find_tree_block(root->fs_info, start); 4282707e8a07SDavid Sterba start += root->nodesize; 4283fd8b2b61SJosef Bacik if (!eb) 4284acce952bSliubo continue; 4285fd8b2b61SJosef Bacik wait_on_extent_buffer_writeback(eb); 4286acce952bSliubo 4287fd8b2b61SJosef Bacik if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, 4288fd8b2b61SJosef Bacik &eb->bflags)) 4289fd8b2b61SJosef Bacik clear_extent_buffer_dirty(eb); 4290fd8b2b61SJosef Bacik free_extent_buffer_stale(eb); 4291acce952bSliubo } 4292acce952bSliubo } 4293acce952bSliubo 4294acce952bSliubo return ret; 4295acce952bSliubo } 4296acce952bSliubo 4297acce952bSliubo static int btrfs_destroy_pinned_extent(struct btrfs_root *root, 4298acce952bSliubo struct extent_io_tree *pinned_extents) 4299acce952bSliubo { 4300acce952bSliubo struct extent_io_tree *unpin; 4301acce952bSliubo u64 start; 4302acce952bSliubo u64 end; 4303acce952bSliubo int ret; 4304ed0eaa14SLiu Bo bool loop = true; 4305acce952bSliubo 4306acce952bSliubo unpin = pinned_extents; 4307ed0eaa14SLiu Bo again: 4308acce952bSliubo while (1) { 4309acce952bSliubo ret = find_first_extent_bit(unpin, 0, &start, &end, 4310e6138876SJosef Bacik EXTENT_DIRTY, NULL); 4311acce952bSliubo if (ret) 4312acce952bSliubo break; 4313acce952bSliubo 4314acce952bSliubo clear_extent_dirty(unpin, start, end, GFP_NOFS); 4315acce952bSliubo btrfs_error_unpin_extent_range(root, start, end); 4316acce952bSliubo cond_resched(); 4317acce952bSliubo } 4318acce952bSliubo 4319ed0eaa14SLiu Bo if (loop) { 4320ed0eaa14SLiu Bo if (unpin == &root->fs_info->freed_extents[0]) 4321ed0eaa14SLiu Bo unpin = &root->fs_info->freed_extents[1]; 4322ed0eaa14SLiu Bo else 4323ed0eaa14SLiu Bo unpin = &root->fs_info->freed_extents[0]; 4324ed0eaa14SLiu Bo loop = false; 4325ed0eaa14SLiu Bo goto again; 4326ed0eaa14SLiu Bo } 4327ed0eaa14SLiu Bo 4328acce952bSliubo return 0; 4329acce952bSliubo } 4330acce952bSliubo 433150d9aa99SJosef Bacik static void btrfs_free_pending_ordered(struct btrfs_transaction *cur_trans, 433250d9aa99SJosef Bacik struct btrfs_fs_info *fs_info) 433350d9aa99SJosef Bacik { 433450d9aa99SJosef Bacik struct btrfs_ordered_extent *ordered; 433550d9aa99SJosef Bacik 433650d9aa99SJosef Bacik spin_lock(&fs_info->trans_lock); 433750d9aa99SJosef Bacik while (!list_empty(&cur_trans->pending_ordered)) { 433850d9aa99SJosef Bacik ordered = list_first_entry(&cur_trans->pending_ordered, 433950d9aa99SJosef Bacik struct btrfs_ordered_extent, 434050d9aa99SJosef Bacik trans_list); 434150d9aa99SJosef Bacik list_del_init(&ordered->trans_list); 434250d9aa99SJosef Bacik spin_unlock(&fs_info->trans_lock); 434350d9aa99SJosef Bacik 434450d9aa99SJosef Bacik btrfs_put_ordered_extent(ordered); 434550d9aa99SJosef Bacik spin_lock(&fs_info->trans_lock); 434650d9aa99SJosef Bacik } 434750d9aa99SJosef Bacik spin_unlock(&fs_info->trans_lock); 434850d9aa99SJosef Bacik } 434950d9aa99SJosef Bacik 435049b25e05SJeff Mahoney void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans, 435149b25e05SJeff Mahoney struct btrfs_root *root) 435249b25e05SJeff Mahoney { 435349b25e05SJeff Mahoney btrfs_destroy_delayed_refs(cur_trans, root); 435449b25e05SJeff Mahoney 43554a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_COMMIT_START; 435649b25e05SJeff Mahoney wake_up(&root->fs_info->transaction_blocked_wait); 435749b25e05SJeff Mahoney 43584a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_UNBLOCKED; 435949b25e05SJeff Mahoney wake_up(&root->fs_info->transaction_wait); 436049b25e05SJeff Mahoney 436150d9aa99SJosef Bacik btrfs_free_pending_ordered(cur_trans, root->fs_info); 436267cde344SMiao Xie btrfs_destroy_delayed_inodes(root); 436367cde344SMiao Xie btrfs_assert_delayed_root_empty(root); 436467cde344SMiao Xie 436549b25e05SJeff Mahoney btrfs_destroy_marked_extents(root, &cur_trans->dirty_pages, 436649b25e05SJeff Mahoney EXTENT_DIRTY); 43676e841e32SLiu Bo btrfs_destroy_pinned_extent(root, 43686e841e32SLiu Bo root->fs_info->pinned_extents); 436949b25e05SJeff Mahoney 43704a9d8bdeSMiao Xie cur_trans->state =TRANS_STATE_COMPLETED; 43714a9d8bdeSMiao Xie wake_up(&cur_trans->commit_wait); 43724a9d8bdeSMiao Xie 437349b25e05SJeff Mahoney /* 437449b25e05SJeff Mahoney memset(cur_trans, 0, sizeof(*cur_trans)); 437549b25e05SJeff Mahoney kmem_cache_free(btrfs_transaction_cachep, cur_trans); 437649b25e05SJeff Mahoney */ 437749b25e05SJeff Mahoney } 437849b25e05SJeff Mahoney 437948a3b636SEric Sandeen static int btrfs_cleanup_transaction(struct btrfs_root *root) 4380acce952bSliubo { 4381acce952bSliubo struct btrfs_transaction *t; 4382acce952bSliubo 4383acce952bSliubo mutex_lock(&root->fs_info->transaction_kthread_mutex); 4384acce952bSliubo 4385a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 4386724e2315SJosef Bacik while (!list_empty(&root->fs_info->trans_list)) { 4387724e2315SJosef Bacik t = list_first_entry(&root->fs_info->trans_list, 4388724e2315SJosef Bacik struct btrfs_transaction, list); 4389724e2315SJosef Bacik if (t->state >= TRANS_STATE_COMMIT_START) { 4390724e2315SJosef Bacik atomic_inc(&t->use_count); 4391724e2315SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4392724e2315SJosef Bacik btrfs_wait_for_commit(root, t->transid); 4393724e2315SJosef Bacik btrfs_put_transaction(t); 4394724e2315SJosef Bacik spin_lock(&root->fs_info->trans_lock); 4395724e2315SJosef Bacik continue; 4396724e2315SJosef Bacik } 4397724e2315SJosef Bacik if (t == root->fs_info->running_transaction) { 4398724e2315SJosef Bacik t->state = TRANS_STATE_COMMIT_DOING; 4399724e2315SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4400724e2315SJosef Bacik /* 4401724e2315SJosef Bacik * We wait for 0 num_writers since we don't hold a trans 4402724e2315SJosef Bacik * handle open currently for this transaction. 4403724e2315SJosef Bacik */ 4404724e2315SJosef Bacik wait_event(t->writer_wait, 4405724e2315SJosef Bacik atomic_read(&t->num_writers) == 0); 4406724e2315SJosef Bacik } else { 4407724e2315SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4408724e2315SJosef Bacik } 4409724e2315SJosef Bacik btrfs_cleanup_one_transaction(t, root); 4410724e2315SJosef Bacik 4411724e2315SJosef Bacik spin_lock(&root->fs_info->trans_lock); 4412724e2315SJosef Bacik if (t == root->fs_info->running_transaction) 4413ac673879SMiao Xie root->fs_info->running_transaction = NULL; 4414724e2315SJosef Bacik list_del_init(&t->list); 4415a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4416a4abeea4SJosef Bacik 4417724e2315SJosef Bacik btrfs_put_transaction(t); 4418724e2315SJosef Bacik trace_btrfs_transaction_commit(root); 4419724e2315SJosef Bacik spin_lock(&root->fs_info->trans_lock); 4420724e2315SJosef Bacik } 4421724e2315SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4422199c2a9cSMiao Xie btrfs_destroy_all_ordered_extents(root->fs_info); 442367cde344SMiao Xie btrfs_destroy_delayed_inodes(root); 442467cde344SMiao Xie btrfs_assert_delayed_root_empty(root); 4425724e2315SJosef Bacik btrfs_destroy_pinned_extent(root, root->fs_info->pinned_extents); 4426eb73c1b7SMiao Xie btrfs_destroy_all_delalloc_inodes(root->fs_info); 4427acce952bSliubo mutex_unlock(&root->fs_info->transaction_kthread_mutex); 4428acce952bSliubo 4429acce952bSliubo return 0; 4430acce952bSliubo } 4431acce952bSliubo 4432e8c9f186SDavid Sterba static const struct extent_io_ops btree_extent_io_ops = { 4433ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 44344bb31e92SArne Jansen .readpage_io_failed_hook = btree_io_failed_hook, 44350b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 4436239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 4437239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 44380da5468fSChris Mason }; 4439