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" 45581bb050SLi Zefan #include "inode-map.h" 4621adbd5cSStefan Behrens #include "check-integrity.h" 47606686eeSJosef Bacik #include "rcu-string.h" 488dabb742SStefan Behrens #include "dev-replace.h" 4953b381b3SDavid Woodhouse #include "raid56.h" 505ac1d209SJeff Mahoney #include "sysfs.h" 51fcebe456SJosef Bacik #include "qgroup.h" 52eb60ceacSChris Mason 53de0022b9SJosef Bacik #ifdef CONFIG_X86 54de0022b9SJosef Bacik #include <asm/cpufeature.h> 55de0022b9SJosef Bacik #endif 56de0022b9SJosef Bacik 57e8c9f186SDavid Sterba static const struct extent_io_ops btree_extent_io_ops; 588b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work); 594df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root); 60fcd1f065SDavid Sterba static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, 61acce952bSliubo int read_only); 62143bede5SJeff Mahoney static void btrfs_destroy_ordered_extents(struct btrfs_root *root); 63acce952bSliubo static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, 64acce952bSliubo struct btrfs_root *root); 65143bede5SJeff Mahoney static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root); 66acce952bSliubo static int btrfs_destroy_marked_extents(struct btrfs_root *root, 67acce952bSliubo struct extent_io_tree *dirty_pages, 68acce952bSliubo int mark); 69acce952bSliubo static int btrfs_destroy_pinned_extent(struct btrfs_root *root, 70acce952bSliubo struct extent_io_tree *pinned_extents); 7148a3b636SEric Sandeen static int btrfs_cleanup_transaction(struct btrfs_root *root); 7248a3b636SEric Sandeen static void btrfs_error_commit_super(struct btrfs_root *root); 73ce9adaa5SChris Mason 74d352ac68SChris Mason /* 7597eb6b69SDavid Sterba * btrfs_end_io_wq structs are used to do processing in task context when an IO 7697eb6b69SDavid Sterba * is complete. This is used during reads to verify checksums, and it is used 77d352ac68SChris Mason * by writes to insert metadata for new file extents after IO is complete. 78d352ac68SChris Mason */ 7997eb6b69SDavid Sterba struct btrfs_end_io_wq { 80ce9adaa5SChris Mason struct bio *bio; 81ce9adaa5SChris Mason bio_end_io_t *end_io; 82ce9adaa5SChris Mason void *private; 83ce9adaa5SChris Mason struct btrfs_fs_info *info; 84ce9adaa5SChris Mason int error; 85bfebd8b5SDavid Sterba enum btrfs_wq_endio_type metadata; 86ce9adaa5SChris Mason struct list_head list; 878b712842SChris Mason struct btrfs_work work; 88ce9adaa5SChris Mason }; 890da5468fSChris Mason 9097eb6b69SDavid Sterba static struct kmem_cache *btrfs_end_io_wq_cache; 9197eb6b69SDavid Sterba 9297eb6b69SDavid Sterba int __init btrfs_end_io_wq_init(void) 9397eb6b69SDavid Sterba { 9497eb6b69SDavid Sterba btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq", 9597eb6b69SDavid Sterba sizeof(struct btrfs_end_io_wq), 9697eb6b69SDavid Sterba 0, 9797eb6b69SDavid Sterba SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, 9897eb6b69SDavid Sterba NULL); 9997eb6b69SDavid Sterba if (!btrfs_end_io_wq_cache) 10097eb6b69SDavid Sterba return -ENOMEM; 10197eb6b69SDavid Sterba return 0; 10297eb6b69SDavid Sterba } 10397eb6b69SDavid Sterba 10497eb6b69SDavid Sterba void btrfs_end_io_wq_exit(void) 10597eb6b69SDavid Sterba { 10697eb6b69SDavid Sterba if (btrfs_end_io_wq_cache) 10797eb6b69SDavid Sterba kmem_cache_destroy(btrfs_end_io_wq_cache); 10897eb6b69SDavid Sterba } 10997eb6b69SDavid Sterba 110d352ac68SChris Mason /* 111d352ac68SChris Mason * async submit bios are used to offload expensive checksumming 112d352ac68SChris Mason * onto the worker threads. They checksum file and metadata bios 113d352ac68SChris Mason * just before they are sent down the IO stack. 114d352ac68SChris Mason */ 11544b8bd7eSChris Mason struct async_submit_bio { 11644b8bd7eSChris Mason struct inode *inode; 11744b8bd7eSChris Mason struct bio *bio; 11844b8bd7eSChris Mason struct list_head list; 1194a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start; 1204a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done; 12144b8bd7eSChris Mason int rw; 12244b8bd7eSChris Mason int mirror_num; 123c8b97818SChris Mason unsigned long bio_flags; 124eaf25d93SChris Mason /* 125eaf25d93SChris Mason * bio_offset is optional, can be used if the pages in the bio 126eaf25d93SChris Mason * can't tell us where in the file the bio should go 127eaf25d93SChris Mason */ 128eaf25d93SChris Mason u64 bio_offset; 1298b712842SChris Mason struct btrfs_work work; 13079787eaaSJeff Mahoney int error; 13144b8bd7eSChris Mason }; 13244b8bd7eSChris Mason 13385d4e461SChris Mason /* 13485d4e461SChris Mason * Lockdep class keys for extent_buffer->lock's in this root. For a given 13585d4e461SChris Mason * eb, the lockdep key is determined by the btrfs_root it belongs to and 13685d4e461SChris Mason * the level the eb occupies in the tree. 1374008c04aSChris Mason * 13885d4e461SChris Mason * Different roots are used for different purposes and may nest inside each 13985d4e461SChris Mason * other and they require separate keysets. As lockdep keys should be 14085d4e461SChris Mason * static, assign keysets according to the purpose of the root as indicated 14185d4e461SChris Mason * by btrfs_root->objectid. This ensures that all special purpose roots 14285d4e461SChris Mason * have separate keysets. 1434008c04aSChris Mason * 14485d4e461SChris Mason * Lock-nesting across peer nodes is always done with the immediate parent 14585d4e461SChris Mason * node locked thus preventing deadlock. As lockdep doesn't know this, use 14685d4e461SChris Mason * subclass to avoid triggering lockdep warning in such cases. 1474008c04aSChris Mason * 14885d4e461SChris Mason * The key is set by the readpage_end_io_hook after the buffer has passed 14985d4e461SChris Mason * csum validation but before the pages are unlocked. It is also set by 15085d4e461SChris Mason * btrfs_init_new_buffer on freshly allocated blocks. 15185d4e461SChris Mason * 15285d4e461SChris Mason * We also add a check to make sure the highest level of the tree is the 15385d4e461SChris Mason * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code 15485d4e461SChris Mason * needs update as well. 1554008c04aSChris Mason */ 1564008c04aSChris Mason #ifdef CONFIG_DEBUG_LOCK_ALLOC 1574008c04aSChris Mason # if BTRFS_MAX_LEVEL != 8 1584008c04aSChris Mason # error 1594008c04aSChris Mason # endif 16085d4e461SChris Mason 16185d4e461SChris Mason static struct btrfs_lockdep_keyset { 16285d4e461SChris Mason u64 id; /* root objectid */ 16385d4e461SChris Mason const char *name_stem; /* lock name stem */ 16485d4e461SChris Mason char names[BTRFS_MAX_LEVEL + 1][20]; 16585d4e461SChris Mason struct lock_class_key keys[BTRFS_MAX_LEVEL + 1]; 16685d4e461SChris Mason } btrfs_lockdep_keysets[] = { 16785d4e461SChris Mason { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" }, 16885d4e461SChris Mason { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" }, 16985d4e461SChris Mason { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" }, 17085d4e461SChris Mason { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" }, 17185d4e461SChris Mason { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" }, 17285d4e461SChris Mason { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" }, 17360b62978SDavid Sterba { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" }, 17485d4e461SChris Mason { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" }, 17585d4e461SChris Mason { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" }, 17685d4e461SChris Mason { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" }, 17713fd8da9SDavid Sterba { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" }, 17885d4e461SChris Mason { .id = 0, .name_stem = "tree" }, 1794008c04aSChris Mason }; 18085d4e461SChris Mason 18185d4e461SChris Mason void __init btrfs_init_lockdep(void) 18285d4e461SChris Mason { 18385d4e461SChris Mason int i, j; 18485d4e461SChris Mason 18585d4e461SChris Mason /* initialize lockdep class names */ 18685d4e461SChris Mason for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) { 18785d4e461SChris Mason struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i]; 18885d4e461SChris Mason 18985d4e461SChris Mason for (j = 0; j < ARRAY_SIZE(ks->names); j++) 19085d4e461SChris Mason snprintf(ks->names[j], sizeof(ks->names[j]), 19185d4e461SChris Mason "btrfs-%s-%02d", ks->name_stem, j); 19285d4e461SChris Mason } 19385d4e461SChris Mason } 19485d4e461SChris Mason 19585d4e461SChris Mason void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, 19685d4e461SChris Mason int level) 19785d4e461SChris Mason { 19885d4e461SChris Mason struct btrfs_lockdep_keyset *ks; 19985d4e461SChris Mason 20085d4e461SChris Mason BUG_ON(level >= ARRAY_SIZE(ks->keys)); 20185d4e461SChris Mason 20285d4e461SChris Mason /* find the matching keyset, id 0 is the default entry */ 20385d4e461SChris Mason for (ks = btrfs_lockdep_keysets; ks->id; ks++) 20485d4e461SChris Mason if (ks->id == objectid) 20585d4e461SChris Mason break; 20685d4e461SChris Mason 20785d4e461SChris Mason lockdep_set_class_and_name(&eb->lock, 20885d4e461SChris Mason &ks->keys[level], ks->names[level]); 20985d4e461SChris Mason } 21085d4e461SChris Mason 2114008c04aSChris Mason #endif 2124008c04aSChris Mason 213d352ac68SChris Mason /* 214d352ac68SChris Mason * extents on the btree inode are pretty simple, there's one extent 215d352ac68SChris Mason * that covers the entire device 216d352ac68SChris Mason */ 217b2950863SChristoph Hellwig static struct extent_map *btree_get_extent(struct inode *inode, 218306e16ceSDavid Sterba struct page *page, size_t pg_offset, u64 start, u64 len, 2195f39d397SChris Mason int create) 2205f39d397SChris Mason { 2215f39d397SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 2225f39d397SChris Mason struct extent_map *em; 2235f39d397SChris Mason int ret; 2245f39d397SChris Mason 225890871beSChris Mason read_lock(&em_tree->lock); 226d1310b2eSChris Mason em = lookup_extent_mapping(em_tree, start, len); 227a061fc8dSChris Mason if (em) { 228a061fc8dSChris Mason em->bdev = 229a061fc8dSChris Mason BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 230890871beSChris Mason read_unlock(&em_tree->lock); 2315f39d397SChris Mason goto out; 232a061fc8dSChris Mason } 233890871beSChris Mason read_unlock(&em_tree->lock); 2347b13b7b1SChris Mason 235172ddd60SDavid Sterba em = alloc_extent_map(); 2365f39d397SChris Mason if (!em) { 2375f39d397SChris Mason em = ERR_PTR(-ENOMEM); 2385f39d397SChris Mason goto out; 2395f39d397SChris Mason } 2405f39d397SChris Mason em->start = 0; 2410afbaf8cSChris Mason em->len = (u64)-1; 242c8b97818SChris Mason em->block_len = (u64)-1; 2435f39d397SChris Mason em->block_start = 0; 244a061fc8dSChris Mason em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 245d1310b2eSChris Mason 246890871beSChris Mason write_lock(&em_tree->lock); 24709a2a8f9SJosef Bacik ret = add_extent_mapping(em_tree, em, 0); 2485f39d397SChris Mason if (ret == -EEXIST) { 2495f39d397SChris Mason free_extent_map(em); 2507b13b7b1SChris Mason em = lookup_extent_mapping(em_tree, start, len); 251b4f359abSTsutomu Itoh if (!em) 2520433f20dSTsutomu Itoh em = ERR_PTR(-EIO); 2535f39d397SChris Mason } else if (ret) { 2547b13b7b1SChris Mason free_extent_map(em); 2550433f20dSTsutomu Itoh em = ERR_PTR(ret); 2565f39d397SChris Mason } 257890871beSChris Mason write_unlock(&em_tree->lock); 2587b13b7b1SChris Mason 2595f39d397SChris Mason out: 2605f39d397SChris Mason return em; 2615f39d397SChris Mason } 2625f39d397SChris Mason 263b0496686SLiu Bo u32 btrfs_csum_data(char *data, u32 seed, size_t len) 26419c00ddcSChris Mason { 2650b947affSFilipe David Borba Manana return btrfs_crc32c(seed, data, len); 26619c00ddcSChris Mason } 26719c00ddcSChris Mason 26819c00ddcSChris Mason void btrfs_csum_final(u32 crc, char *result) 26919c00ddcSChris Mason { 2707e75bf3fSDavid Sterba put_unaligned_le32(~crc, result); 27119c00ddcSChris Mason } 27219c00ddcSChris Mason 273d352ac68SChris Mason /* 274d352ac68SChris Mason * compute the csum for a btree block, and either verify it or write it 275d352ac68SChris Mason * into the csum field of the block. 276d352ac68SChris Mason */ 27701d58472SDaniel Dressler static int csum_tree_block(struct btrfs_fs_info *fs_info, 27801d58472SDaniel Dressler struct extent_buffer *buf, 27919c00ddcSChris Mason int verify) 28019c00ddcSChris Mason { 28101d58472SDaniel Dressler u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); 282607d432dSJosef Bacik char *result = NULL; 28319c00ddcSChris Mason unsigned long len; 28419c00ddcSChris Mason unsigned long cur_len; 28519c00ddcSChris Mason unsigned long offset = BTRFS_CSUM_SIZE; 28619c00ddcSChris Mason char *kaddr; 28719c00ddcSChris Mason unsigned long map_start; 28819c00ddcSChris Mason unsigned long map_len; 28919c00ddcSChris Mason int err; 29019c00ddcSChris Mason u32 crc = ~(u32)0; 291607d432dSJosef Bacik unsigned long inline_result; 29219c00ddcSChris Mason 29319c00ddcSChris Mason len = buf->len - offset; 29419c00ddcSChris Mason while (len > 0) { 29519c00ddcSChris Mason err = map_private_extent_buffer(buf, offset, 32, 296a6591715SChris Mason &kaddr, &map_start, &map_len); 297d397712bSChris Mason if (err) 29819c00ddcSChris Mason return 1; 29919c00ddcSChris Mason cur_len = min(len, map_len - (offset - map_start)); 300b0496686SLiu Bo crc = btrfs_csum_data(kaddr + offset - map_start, 30119c00ddcSChris Mason crc, cur_len); 30219c00ddcSChris Mason len -= cur_len; 30319c00ddcSChris Mason offset += cur_len; 30419c00ddcSChris Mason } 305607d432dSJosef Bacik if (csum_size > sizeof(inline_result)) { 30631e818feSDavid Sterba result = kzalloc(csum_size, GFP_NOFS); 307607d432dSJosef Bacik if (!result) 308607d432dSJosef Bacik return 1; 309607d432dSJosef Bacik } else { 310607d432dSJosef Bacik result = (char *)&inline_result; 311607d432dSJosef Bacik } 312607d432dSJosef Bacik 31319c00ddcSChris Mason btrfs_csum_final(crc, result); 31419c00ddcSChris Mason 31519c00ddcSChris Mason if (verify) { 316607d432dSJosef Bacik if (memcmp_extent_buffer(buf, result, 0, csum_size)) { 317e4204dedSChris Mason u32 val; 318e4204dedSChris Mason u32 found = 0; 319607d432dSJosef Bacik memcpy(&found, result, csum_size); 320e4204dedSChris Mason 321607d432dSJosef Bacik read_extent_buffer(buf, &val, 0, csum_size); 32294647322SDavid Sterba btrfs_warn_rl(fs_info, 32394647322SDavid Sterba "%s checksum verify failed on %llu wanted %X found %X " 32494647322SDavid Sterba "level %d", 32501d58472SDaniel Dressler fs_info->sb->s_id, buf->start, 326c1c9ff7cSGeert Uytterhoeven val, found, btrfs_header_level(buf)); 327607d432dSJosef Bacik if (result != (char *)&inline_result) 328607d432dSJosef Bacik kfree(result); 32919c00ddcSChris Mason return 1; 33019c00ddcSChris Mason } 33119c00ddcSChris Mason } else { 332607d432dSJosef Bacik write_extent_buffer(buf, result, 0, csum_size); 33319c00ddcSChris Mason } 334607d432dSJosef Bacik if (result != (char *)&inline_result) 335607d432dSJosef Bacik kfree(result); 33619c00ddcSChris Mason return 0; 33719c00ddcSChris Mason } 33819c00ddcSChris Mason 339d352ac68SChris Mason /* 340d352ac68SChris Mason * we can't consider a given block up to date unless the transid of the 341d352ac68SChris Mason * block matches the transid in the parent node's pointer. This is how we 342d352ac68SChris Mason * detect blocks that either didn't get written at all or got written 343d352ac68SChris Mason * in the wrong place. 344d352ac68SChris Mason */ 3451259ab75SChris Mason static int verify_parent_transid(struct extent_io_tree *io_tree, 346b9fab919SChris Mason struct extent_buffer *eb, u64 parent_transid, 347b9fab919SChris Mason int atomic) 3481259ab75SChris Mason { 3492ac55d41SJosef Bacik struct extent_state *cached_state = NULL; 3501259ab75SChris Mason int ret; 3512755a0deSDavid Sterba bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB); 3521259ab75SChris Mason 3531259ab75SChris Mason if (!parent_transid || btrfs_header_generation(eb) == parent_transid) 3541259ab75SChris Mason return 0; 3551259ab75SChris Mason 356b9fab919SChris Mason if (atomic) 357b9fab919SChris Mason return -EAGAIN; 358b9fab919SChris Mason 359a26e8c9fSJosef Bacik if (need_lock) { 360a26e8c9fSJosef Bacik btrfs_tree_read_lock(eb); 361a26e8c9fSJosef Bacik btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); 362a26e8c9fSJosef Bacik } 363a26e8c9fSJosef Bacik 3642ac55d41SJosef Bacik lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, 365d0082371SJeff Mahoney 0, &cached_state); 3660b32f4bbSJosef Bacik if (extent_buffer_uptodate(eb) && 3671259ab75SChris Mason btrfs_header_generation(eb) == parent_transid) { 3681259ab75SChris Mason ret = 0; 3691259ab75SChris Mason goto out; 3701259ab75SChris Mason } 37194647322SDavid Sterba btrfs_err_rl(eb->fs_info, 37294647322SDavid Sterba "parent transid verify failed on %llu wanted %llu found %llu", 37394647322SDavid Sterba eb->start, 37429549aecSWang Shilong parent_transid, btrfs_header_generation(eb)); 3751259ab75SChris Mason ret = 1; 376a26e8c9fSJosef Bacik 377a26e8c9fSJosef Bacik /* 378a26e8c9fSJosef Bacik * Things reading via commit roots that don't have normal protection, 379a26e8c9fSJosef Bacik * like send, can have a really old block in cache that may point at a 380a26e8c9fSJosef Bacik * block that has been free'd and re-allocated. So don't clear uptodate 381a26e8c9fSJosef Bacik * if we find an eb that is under IO (dirty/writeback) because we could 382a26e8c9fSJosef Bacik * end up reading in the stale data and then writing it back out and 383a26e8c9fSJosef Bacik * making everybody very sad. 384a26e8c9fSJosef Bacik */ 385a26e8c9fSJosef Bacik if (!extent_buffer_under_io(eb)) 3860b32f4bbSJosef Bacik clear_extent_buffer_uptodate(eb); 38733958dc6SChris Mason out: 3882ac55d41SJosef Bacik unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, 3892ac55d41SJosef Bacik &cached_state, GFP_NOFS); 390472b909fSJosef Bacik if (need_lock) 391a26e8c9fSJosef Bacik btrfs_tree_read_unlock_blocking(eb); 3921259ab75SChris Mason return ret; 3931259ab75SChris Mason } 3941259ab75SChris Mason 395d352ac68SChris Mason /* 3961104a885SDavid Sterba * Return 0 if the superblock checksum type matches the checksum value of that 3971104a885SDavid Sterba * algorithm. Pass the raw disk superblock data. 3981104a885SDavid Sterba */ 3991104a885SDavid Sterba static int btrfs_check_super_csum(char *raw_disk_sb) 4001104a885SDavid Sterba { 4011104a885SDavid Sterba struct btrfs_super_block *disk_sb = 4021104a885SDavid Sterba (struct btrfs_super_block *)raw_disk_sb; 4031104a885SDavid Sterba u16 csum_type = btrfs_super_csum_type(disk_sb); 4041104a885SDavid Sterba int ret = 0; 4051104a885SDavid Sterba 4061104a885SDavid Sterba if (csum_type == BTRFS_CSUM_TYPE_CRC32) { 4071104a885SDavid Sterba u32 crc = ~(u32)0; 4081104a885SDavid Sterba const int csum_size = sizeof(crc); 4091104a885SDavid Sterba char result[csum_size]; 4101104a885SDavid Sterba 4111104a885SDavid Sterba /* 4121104a885SDavid Sterba * The super_block structure does not span the whole 4131104a885SDavid Sterba * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space 4141104a885SDavid Sterba * is filled with zeros and is included in the checkum. 4151104a885SDavid Sterba */ 4161104a885SDavid Sterba crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE, 4171104a885SDavid Sterba crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE); 4181104a885SDavid Sterba btrfs_csum_final(crc, result); 4191104a885SDavid Sterba 4201104a885SDavid Sterba if (memcmp(raw_disk_sb, result, csum_size)) 4211104a885SDavid Sterba ret = 1; 4221104a885SDavid Sterba } 4231104a885SDavid Sterba 4241104a885SDavid Sterba if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) { 425efe120a0SFrank Holton printk(KERN_ERR "BTRFS: unsupported checksum algorithm %u\n", 4261104a885SDavid Sterba csum_type); 4271104a885SDavid Sterba ret = 1; 4281104a885SDavid Sterba } 4291104a885SDavid Sterba 4301104a885SDavid Sterba return ret; 4311104a885SDavid Sterba } 4321104a885SDavid Sterba 4331104a885SDavid Sterba /* 434d352ac68SChris Mason * helper to read a given tree block, doing retries as required when 435d352ac68SChris Mason * the checksums don't match and we have alternate mirrors to try. 436d352ac68SChris Mason */ 437f188591eSChris Mason static int btree_read_extent_buffer_pages(struct btrfs_root *root, 438f188591eSChris Mason struct extent_buffer *eb, 439ca7a79adSChris Mason u64 start, u64 parent_transid) 440f188591eSChris Mason { 441f188591eSChris Mason struct extent_io_tree *io_tree; 442ea466794SJosef Bacik int failed = 0; 443f188591eSChris Mason int ret; 444f188591eSChris Mason int num_copies = 0; 445f188591eSChris Mason int mirror_num = 0; 446ea466794SJosef Bacik int failed_mirror = 0; 447f188591eSChris Mason 448a826d6dcSJosef Bacik clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); 449f188591eSChris Mason io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 450f188591eSChris Mason while (1) { 451bb82ab88SArne Jansen ret = read_extent_buffer_pages(io_tree, eb, start, 452bb82ab88SArne Jansen WAIT_COMPLETE, 453f188591eSChris Mason btree_get_extent, mirror_num); 454256dd1bbSStefan Behrens if (!ret) { 455256dd1bbSStefan Behrens if (!verify_parent_transid(io_tree, eb, 456b9fab919SChris Mason parent_transid, 0)) 457ea466794SJosef Bacik break; 458256dd1bbSStefan Behrens else 459256dd1bbSStefan Behrens ret = -EIO; 460256dd1bbSStefan Behrens } 461d397712bSChris Mason 462a826d6dcSJosef Bacik /* 463a826d6dcSJosef Bacik * This buffer's crc is fine, but its contents are corrupted, so 464a826d6dcSJosef Bacik * there is no reason to read the other copies, they won't be 465a826d6dcSJosef Bacik * any less wrong. 466a826d6dcSJosef Bacik */ 467a826d6dcSJosef Bacik if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags)) 468ea466794SJosef Bacik break; 469ea466794SJosef Bacik 4705d964051SStefan Behrens num_copies = btrfs_num_copies(root->fs_info, 471f188591eSChris Mason eb->start, eb->len); 4724235298eSChris Mason if (num_copies == 1) 473ea466794SJosef Bacik break; 4744235298eSChris Mason 4755cf1ab56SJosef Bacik if (!failed_mirror) { 4765cf1ab56SJosef Bacik failed = 1; 4775cf1ab56SJosef Bacik failed_mirror = eb->read_mirror; 4785cf1ab56SJosef Bacik } 4795cf1ab56SJosef Bacik 480f188591eSChris Mason mirror_num++; 481ea466794SJosef Bacik if (mirror_num == failed_mirror) 482ea466794SJosef Bacik mirror_num++; 483ea466794SJosef Bacik 4844235298eSChris Mason if (mirror_num > num_copies) 485ea466794SJosef Bacik break; 486f188591eSChris Mason } 487ea466794SJosef Bacik 488c0901581SStefan Behrens if (failed && !ret && failed_mirror) 489ea466794SJosef Bacik repair_eb_io_failure(root, eb, failed_mirror); 490ea466794SJosef Bacik 491ea466794SJosef Bacik return ret; 492f188591eSChris Mason } 49319c00ddcSChris Mason 494d352ac68SChris Mason /* 495d397712bSChris Mason * checksum a dirty tree block before IO. This has extra checks to make sure 496d397712bSChris Mason * we only fill in the checksum field in the first page of a multi-page block 497d352ac68SChris Mason */ 498d397712bSChris Mason 49901d58472SDaniel Dressler static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page) 50019c00ddcSChris Mason { 5014eee4fa4SMiao Xie u64 start = page_offset(page); 50219c00ddcSChris Mason u64 found_start; 50319c00ddcSChris Mason struct extent_buffer *eb; 504f188591eSChris Mason 5054f2de97aSJosef Bacik eb = (struct extent_buffer *)page->private; 5064f2de97aSJosef Bacik if (page != eb->pages[0]) 5074f2de97aSJosef Bacik return 0; 50819c00ddcSChris Mason found_start = btrfs_header_bytenr(eb); 509fae7f21cSDulshani Gunawardhana if (WARN_ON(found_start != start || !PageUptodate(page))) 5104f2de97aSJosef Bacik return 0; 51101d58472SDaniel Dressler csum_tree_block(fs_info, eb, 0); 51219c00ddcSChris Mason return 0; 51319c00ddcSChris Mason } 51419c00ddcSChris Mason 51501d58472SDaniel Dressler static int check_tree_block_fsid(struct btrfs_fs_info *fs_info, 5162b82032cSYan Zheng struct extent_buffer *eb) 5172b82032cSYan Zheng { 51801d58472SDaniel Dressler struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 5192b82032cSYan Zheng u8 fsid[BTRFS_UUID_SIZE]; 5202b82032cSYan Zheng int ret = 1; 5212b82032cSYan Zheng 5220a4e5586SRoss Kirk read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE); 5232b82032cSYan Zheng while (fs_devices) { 5242b82032cSYan Zheng if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { 5252b82032cSYan Zheng ret = 0; 5262b82032cSYan Zheng break; 5272b82032cSYan Zheng } 5282b82032cSYan Zheng fs_devices = fs_devices->seed; 5292b82032cSYan Zheng } 5302b82032cSYan Zheng return ret; 5312b82032cSYan Zheng } 5322b82032cSYan Zheng 533a826d6dcSJosef Bacik #define CORRUPT(reason, eb, root, slot) \ 534efe120a0SFrank Holton btrfs_crit(root->fs_info, "corrupt leaf, %s: block=%llu," \ 535efe120a0SFrank Holton "root=%llu, slot=%d", reason, \ 536c1c9ff7cSGeert Uytterhoeven btrfs_header_bytenr(eb), root->objectid, slot) 537a826d6dcSJosef Bacik 538a826d6dcSJosef Bacik static noinline int check_leaf(struct btrfs_root *root, 539a826d6dcSJosef Bacik struct extent_buffer *leaf) 540a826d6dcSJosef Bacik { 541a826d6dcSJosef Bacik struct btrfs_key key; 542a826d6dcSJosef Bacik struct btrfs_key leaf_key; 543a826d6dcSJosef Bacik u32 nritems = btrfs_header_nritems(leaf); 544a826d6dcSJosef Bacik int slot; 545a826d6dcSJosef Bacik 546a826d6dcSJosef Bacik if (nritems == 0) 547a826d6dcSJosef Bacik return 0; 548a826d6dcSJosef Bacik 549a826d6dcSJosef Bacik /* Check the 0 item */ 550a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) != 551a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 552a826d6dcSJosef Bacik CORRUPT("invalid item offset size pair", leaf, root, 0); 553a826d6dcSJosef Bacik return -EIO; 554a826d6dcSJosef Bacik } 555a826d6dcSJosef Bacik 556a826d6dcSJosef Bacik /* 557a826d6dcSJosef Bacik * Check to make sure each items keys are in the correct order and their 558a826d6dcSJosef Bacik * offsets make sense. We only have to loop through nritems-1 because 559a826d6dcSJosef Bacik * we check the current slot against the next slot, which verifies the 560a826d6dcSJosef Bacik * next slot's offset+size makes sense and that the current's slot 561a826d6dcSJosef Bacik * offset is correct. 562a826d6dcSJosef Bacik */ 563a826d6dcSJosef Bacik for (slot = 0; slot < nritems - 1; slot++) { 564a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &leaf_key, slot); 565a826d6dcSJosef Bacik btrfs_item_key_to_cpu(leaf, &key, slot + 1); 566a826d6dcSJosef Bacik 567a826d6dcSJosef Bacik /* Make sure the keys are in the right order */ 568a826d6dcSJosef Bacik if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) { 569a826d6dcSJosef Bacik CORRUPT("bad key order", leaf, root, slot); 570a826d6dcSJosef Bacik return -EIO; 571a826d6dcSJosef Bacik } 572a826d6dcSJosef Bacik 573a826d6dcSJosef Bacik /* 574a826d6dcSJosef Bacik * Make sure the offset and ends are right, remember that the 575a826d6dcSJosef Bacik * item data starts at the end of the leaf and grows towards the 576a826d6dcSJosef Bacik * front. 577a826d6dcSJosef Bacik */ 578a826d6dcSJosef Bacik if (btrfs_item_offset_nr(leaf, slot) != 579a826d6dcSJosef Bacik btrfs_item_end_nr(leaf, slot + 1)) { 580a826d6dcSJosef Bacik CORRUPT("slot offset bad", leaf, root, slot); 581a826d6dcSJosef Bacik return -EIO; 582a826d6dcSJosef Bacik } 583a826d6dcSJosef Bacik 584a826d6dcSJosef Bacik /* 585a826d6dcSJosef Bacik * Check to make sure that we don't point outside of the leaf, 586a826d6dcSJosef Bacik * just incase all the items are consistent to eachother, but 587a826d6dcSJosef Bacik * all point outside of the leaf. 588a826d6dcSJosef Bacik */ 589a826d6dcSJosef Bacik if (btrfs_item_end_nr(leaf, slot) > 590a826d6dcSJosef Bacik BTRFS_LEAF_DATA_SIZE(root)) { 591a826d6dcSJosef Bacik CORRUPT("slot end outside of leaf", leaf, root, slot); 592a826d6dcSJosef Bacik return -EIO; 593a826d6dcSJosef Bacik } 594a826d6dcSJosef Bacik } 595a826d6dcSJosef Bacik 596a826d6dcSJosef Bacik return 0; 597a826d6dcSJosef Bacik } 598a826d6dcSJosef Bacik 599facc8a22SMiao Xie static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio, 600facc8a22SMiao Xie u64 phy_offset, struct page *page, 601facc8a22SMiao Xie u64 start, u64 end, int mirror) 602ce9adaa5SChris Mason { 603ce9adaa5SChris Mason u64 found_start; 604ce9adaa5SChris Mason int found_level; 605ce9adaa5SChris Mason struct extent_buffer *eb; 606ce9adaa5SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 607f188591eSChris Mason int ret = 0; 608727011e0SChris Mason int reads_done; 609ce9adaa5SChris Mason 610ce9adaa5SChris Mason if (!page->private) 611ce9adaa5SChris Mason goto out; 612d397712bSChris Mason 6134f2de97aSJosef Bacik eb = (struct extent_buffer *)page->private; 614d397712bSChris Mason 6150b32f4bbSJosef Bacik /* the pending IO might have been the only thing that kept this buffer 6160b32f4bbSJosef Bacik * in memory. Make sure we have a ref for all this other checks 6170b32f4bbSJosef Bacik */ 6180b32f4bbSJosef Bacik extent_buffer_get(eb); 6190b32f4bbSJosef Bacik 6200b32f4bbSJosef Bacik reads_done = atomic_dec_and_test(&eb->io_pages); 621727011e0SChris Mason if (!reads_done) 622727011e0SChris Mason goto err; 623f188591eSChris Mason 6245cf1ab56SJosef Bacik eb->read_mirror = mirror; 625656f30dbSFilipe Manana if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) { 626ea466794SJosef Bacik ret = -EIO; 627ea466794SJosef Bacik goto err; 628ea466794SJosef Bacik } 629ea466794SJosef Bacik 630ce9adaa5SChris Mason found_start = btrfs_header_bytenr(eb); 631727011e0SChris Mason if (found_start != eb->start) { 63294647322SDavid Sterba btrfs_err_rl(eb->fs_info, "bad tree block start %llu %llu", 63394647322SDavid Sterba found_start, eb->start); 634f188591eSChris Mason ret = -EIO; 635ce9adaa5SChris Mason goto err; 636ce9adaa5SChris Mason } 63701d58472SDaniel Dressler if (check_tree_block_fsid(root->fs_info, eb)) { 63894647322SDavid Sterba btrfs_err_rl(eb->fs_info, "bad fsid on block %llu", 63994647322SDavid Sterba eb->start); 6401259ab75SChris Mason ret = -EIO; 6411259ab75SChris Mason goto err; 6421259ab75SChris Mason } 643ce9adaa5SChris Mason found_level = btrfs_header_level(eb); 6441c24c3ceSJosef Bacik if (found_level >= BTRFS_MAX_LEVEL) { 64568b663d1SDavid Sterba btrfs_err(root->fs_info, "bad tree block level %d", 6461c24c3ceSJosef Bacik (int)btrfs_header_level(eb)); 6471c24c3ceSJosef Bacik ret = -EIO; 6481c24c3ceSJosef Bacik goto err; 6491c24c3ceSJosef Bacik } 650ce9adaa5SChris Mason 65185d4e461SChris Mason btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), 65285d4e461SChris Mason eb, found_level); 6534008c04aSChris Mason 65401d58472SDaniel Dressler ret = csum_tree_block(root->fs_info, eb, 1); 655a826d6dcSJosef Bacik if (ret) { 656f188591eSChris Mason ret = -EIO; 657a826d6dcSJosef Bacik goto err; 658a826d6dcSJosef Bacik } 659a826d6dcSJosef Bacik 660a826d6dcSJosef Bacik /* 661a826d6dcSJosef Bacik * If this is a leaf block and it is corrupt, set the corrupt bit so 662a826d6dcSJosef Bacik * that we don't try and read the other copies of this block, just 663a826d6dcSJosef Bacik * return -EIO. 664a826d6dcSJosef Bacik */ 665a826d6dcSJosef Bacik if (found_level == 0 && check_leaf(root, eb)) { 666a826d6dcSJosef Bacik set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); 667a826d6dcSJosef Bacik ret = -EIO; 668a826d6dcSJosef Bacik } 669ce9adaa5SChris Mason 6700b32f4bbSJosef Bacik if (!ret) 6710b32f4bbSJosef Bacik set_extent_buffer_uptodate(eb); 672ce9adaa5SChris Mason err: 67379fb65a1SJosef Bacik if (reads_done && 67479fb65a1SJosef Bacik test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) 6754bb31e92SArne Jansen btree_readahead_hook(root, eb, eb->start, ret); 6764bb31e92SArne Jansen 67753b381b3SDavid Woodhouse if (ret) { 67853b381b3SDavid Woodhouse /* 67953b381b3SDavid Woodhouse * our io error hook is going to dec the io pages 68053b381b3SDavid Woodhouse * again, we have to make sure it has something 68153b381b3SDavid Woodhouse * to decrement 68253b381b3SDavid Woodhouse */ 68353b381b3SDavid Woodhouse atomic_inc(&eb->io_pages); 6840b32f4bbSJosef Bacik clear_extent_buffer_uptodate(eb); 68553b381b3SDavid Woodhouse } 6860b32f4bbSJosef Bacik free_extent_buffer(eb); 687ce9adaa5SChris Mason out: 688f188591eSChris Mason return ret; 689ce9adaa5SChris Mason } 690ce9adaa5SChris Mason 691ea466794SJosef Bacik static int btree_io_failed_hook(struct page *page, int failed_mirror) 6924bb31e92SArne Jansen { 6934bb31e92SArne Jansen struct extent_buffer *eb; 6944bb31e92SArne Jansen struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 6954bb31e92SArne Jansen 6964f2de97aSJosef Bacik eb = (struct extent_buffer *)page->private; 697656f30dbSFilipe Manana set_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); 6985cf1ab56SJosef Bacik eb->read_mirror = failed_mirror; 69953b381b3SDavid Woodhouse atomic_dec(&eb->io_pages); 700ea466794SJosef Bacik if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) 7014bb31e92SArne Jansen btree_readahead_hook(root, eb, eb->start, -EIO); 7024bb31e92SArne Jansen return -EIO; /* we fixed nothing */ 7034bb31e92SArne Jansen } 7044bb31e92SArne Jansen 7054246a0b6SChristoph Hellwig static void end_workqueue_bio(struct bio *bio) 706ce9adaa5SChris Mason { 70797eb6b69SDavid Sterba struct btrfs_end_io_wq *end_io_wq = bio->bi_private; 708ce9adaa5SChris Mason struct btrfs_fs_info *fs_info; 7099e0af237SLiu Bo struct btrfs_workqueue *wq; 7109e0af237SLiu Bo btrfs_work_func_t func; 711ce9adaa5SChris Mason 712ce9adaa5SChris Mason fs_info = end_io_wq->info; 7134246a0b6SChristoph Hellwig end_io_wq->error = bio->bi_error; 714d20f7043SChris Mason 7157b6d91daSChristoph Hellwig if (bio->bi_rw & REQ_WRITE) { 7169e0af237SLiu Bo if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) { 7179e0af237SLiu Bo wq = fs_info->endio_meta_write_workers; 7189e0af237SLiu Bo func = btrfs_endio_meta_write_helper; 7199e0af237SLiu Bo } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) { 7209e0af237SLiu Bo wq = fs_info->endio_freespace_worker; 7219e0af237SLiu Bo func = btrfs_freespace_write_helper; 7229e0af237SLiu Bo } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) { 7239e0af237SLiu Bo wq = fs_info->endio_raid56_workers; 7249e0af237SLiu Bo func = btrfs_endio_raid56_helper; 725d20f7043SChris Mason } else { 7269e0af237SLiu Bo wq = fs_info->endio_write_workers; 7279e0af237SLiu Bo func = btrfs_endio_write_helper; 728d20f7043SChris Mason } 7299e0af237SLiu Bo } else { 7308b110e39SMiao Xie if (unlikely(end_io_wq->metadata == 7318b110e39SMiao Xie BTRFS_WQ_ENDIO_DIO_REPAIR)) { 7328b110e39SMiao Xie wq = fs_info->endio_repair_workers; 7338b110e39SMiao Xie func = btrfs_endio_repair_helper; 7348b110e39SMiao Xie } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) { 7359e0af237SLiu Bo wq = fs_info->endio_raid56_workers; 7369e0af237SLiu Bo func = btrfs_endio_raid56_helper; 7379e0af237SLiu Bo } else if (end_io_wq->metadata) { 7389e0af237SLiu Bo wq = fs_info->endio_meta_workers; 7399e0af237SLiu Bo func = btrfs_endio_meta_helper; 7409e0af237SLiu Bo } else { 7419e0af237SLiu Bo wq = fs_info->endio_workers; 7429e0af237SLiu Bo func = btrfs_endio_helper; 7439e0af237SLiu Bo } 7449e0af237SLiu Bo } 7459e0af237SLiu Bo 7469e0af237SLiu Bo btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL); 7479e0af237SLiu Bo btrfs_queue_work(wq, &end_io_wq->work); 748ce9adaa5SChris Mason } 749ce9adaa5SChris Mason 75022c59948SChris Mason int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 751bfebd8b5SDavid Sterba enum btrfs_wq_endio_type metadata) 7520b86a832SChris Mason { 75397eb6b69SDavid Sterba struct btrfs_end_io_wq *end_io_wq; 7548b110e39SMiao Xie 75597eb6b69SDavid Sterba end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS); 756ce9adaa5SChris Mason if (!end_io_wq) 757ce9adaa5SChris Mason return -ENOMEM; 758ce9adaa5SChris Mason 759ce9adaa5SChris Mason end_io_wq->private = bio->bi_private; 760ce9adaa5SChris Mason end_io_wq->end_io = bio->bi_end_io; 76122c59948SChris Mason end_io_wq->info = info; 762ce9adaa5SChris Mason end_io_wq->error = 0; 763ce9adaa5SChris Mason end_io_wq->bio = bio; 76422c59948SChris Mason end_io_wq->metadata = metadata; 765ce9adaa5SChris Mason 766ce9adaa5SChris Mason bio->bi_private = end_io_wq; 767ce9adaa5SChris Mason bio->bi_end_io = end_workqueue_bio; 76822c59948SChris Mason return 0; 76922c59948SChris Mason } 77022c59948SChris Mason 771b64a2851SChris Mason unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) 7724854ddd0SChris Mason { 7734854ddd0SChris Mason unsigned long limit = min_t(unsigned long, 7745cdc7ad3SQu Wenruo info->thread_pool_size, 7754854ddd0SChris Mason info->fs_devices->open_devices); 7764854ddd0SChris Mason return 256 * limit; 7774854ddd0SChris Mason } 7784854ddd0SChris Mason 7794a69a410SChris Mason static void run_one_async_start(struct btrfs_work *work) 7804a69a410SChris Mason { 7814a69a410SChris Mason struct async_submit_bio *async; 78279787eaaSJeff Mahoney int ret; 7834a69a410SChris Mason 7844a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 78579787eaaSJeff Mahoney ret = async->submit_bio_start(async->inode, async->rw, async->bio, 786eaf25d93SChris Mason async->mirror_num, async->bio_flags, 787eaf25d93SChris Mason async->bio_offset); 78879787eaaSJeff Mahoney if (ret) 78979787eaaSJeff Mahoney async->error = ret; 7904a69a410SChris Mason } 7914a69a410SChris Mason 7924a69a410SChris Mason static void run_one_async_done(struct btrfs_work *work) 7938b712842SChris Mason { 7948b712842SChris Mason struct btrfs_fs_info *fs_info; 7958b712842SChris Mason struct async_submit_bio *async; 7964854ddd0SChris Mason int limit; 7978b712842SChris Mason 7988b712842SChris Mason async = container_of(work, struct async_submit_bio, work); 7998b712842SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 8004854ddd0SChris Mason 801b64a2851SChris Mason limit = btrfs_async_submit_limit(fs_info); 8024854ddd0SChris Mason limit = limit * 2 / 3; 8034854ddd0SChris Mason 804ee863954SDavid Sterba /* 805ee863954SDavid Sterba * atomic_dec_return implies a barrier for waitqueue_active 806ee863954SDavid Sterba */ 80766657b31SJosef Bacik if (atomic_dec_return(&fs_info->nr_async_submits) < limit && 808b64a2851SChris Mason waitqueue_active(&fs_info->async_submit_wait)) 8094854ddd0SChris Mason wake_up(&fs_info->async_submit_wait); 8104854ddd0SChris Mason 81179787eaaSJeff Mahoney /* If an error occured we just want to clean up the bio and move on */ 81279787eaaSJeff Mahoney if (async->error) { 8134246a0b6SChristoph Hellwig async->bio->bi_error = async->error; 8144246a0b6SChristoph Hellwig bio_endio(async->bio); 81579787eaaSJeff Mahoney return; 81679787eaaSJeff Mahoney } 81779787eaaSJeff Mahoney 8184a69a410SChris Mason async->submit_bio_done(async->inode, async->rw, async->bio, 819eaf25d93SChris Mason async->mirror_num, async->bio_flags, 820eaf25d93SChris Mason async->bio_offset); 8214a69a410SChris Mason } 8224a69a410SChris Mason 8234a69a410SChris Mason static void run_one_async_free(struct btrfs_work *work) 8244a69a410SChris Mason { 8254a69a410SChris Mason struct async_submit_bio *async; 8264a69a410SChris Mason 8274a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 8288b712842SChris Mason kfree(async); 8298b712842SChris Mason } 8308b712842SChris Mason 83144b8bd7eSChris Mason int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 83244b8bd7eSChris Mason int rw, struct bio *bio, int mirror_num, 833c8b97818SChris Mason unsigned long bio_flags, 834eaf25d93SChris Mason u64 bio_offset, 8354a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start, 8364a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done) 83744b8bd7eSChris Mason { 83844b8bd7eSChris Mason struct async_submit_bio *async; 83944b8bd7eSChris Mason 84044b8bd7eSChris Mason async = kmalloc(sizeof(*async), GFP_NOFS); 84144b8bd7eSChris Mason if (!async) 84244b8bd7eSChris Mason return -ENOMEM; 84344b8bd7eSChris Mason 84444b8bd7eSChris Mason async->inode = inode; 84544b8bd7eSChris Mason async->rw = rw; 84644b8bd7eSChris Mason async->bio = bio; 84744b8bd7eSChris Mason async->mirror_num = mirror_num; 8484a69a410SChris Mason async->submit_bio_start = submit_bio_start; 8494a69a410SChris Mason async->submit_bio_done = submit_bio_done; 8504a69a410SChris Mason 8519e0af237SLiu Bo btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start, 8525cdc7ad3SQu Wenruo run_one_async_done, run_one_async_free); 8534a69a410SChris Mason 854c8b97818SChris Mason async->bio_flags = bio_flags; 855eaf25d93SChris Mason async->bio_offset = bio_offset; 8568c8bee1dSChris Mason 85779787eaaSJeff Mahoney async->error = 0; 85879787eaaSJeff Mahoney 859cb03c743SChris Mason atomic_inc(&fs_info->nr_async_submits); 860d313d7a3SChris Mason 8617b6d91daSChristoph Hellwig if (rw & REQ_SYNC) 8625cdc7ad3SQu Wenruo btrfs_set_work_high_priority(&async->work); 863d313d7a3SChris Mason 8645cdc7ad3SQu Wenruo btrfs_queue_work(fs_info->workers, &async->work); 8659473f16cSChris Mason 866771ed689SChris Mason while (atomic_read(&fs_info->async_submit_draining) && 867771ed689SChris Mason atomic_read(&fs_info->nr_async_submits)) { 868771ed689SChris Mason wait_event(fs_info->async_submit_wait, 869771ed689SChris Mason (atomic_read(&fs_info->nr_async_submits) == 0)); 870771ed689SChris Mason } 871771ed689SChris Mason 87244b8bd7eSChris Mason return 0; 87344b8bd7eSChris Mason } 87444b8bd7eSChris Mason 875ce3ed71aSChris Mason static int btree_csum_one_bio(struct bio *bio) 876ce3ed71aSChris Mason { 8772c30c71bSKent Overstreet struct bio_vec *bvec; 878ce3ed71aSChris Mason struct btrfs_root *root; 8792c30c71bSKent Overstreet int i, ret = 0; 880ce3ed71aSChris Mason 8812c30c71bSKent Overstreet bio_for_each_segment_all(bvec, bio, i) { 882ce3ed71aSChris Mason root = BTRFS_I(bvec->bv_page->mapping->host)->root; 88301d58472SDaniel Dressler ret = csum_dirty_buffer(root->fs_info, bvec->bv_page); 88479787eaaSJeff Mahoney if (ret) 88579787eaaSJeff Mahoney break; 886ce3ed71aSChris Mason } 8872c30c71bSKent Overstreet 88879787eaaSJeff Mahoney return ret; 889ce3ed71aSChris Mason } 890ce3ed71aSChris Mason 8914a69a410SChris Mason static int __btree_submit_bio_start(struct inode *inode, int rw, 8924a69a410SChris Mason struct bio *bio, int mirror_num, 893eaf25d93SChris Mason unsigned long bio_flags, 894eaf25d93SChris Mason u64 bio_offset) 89522c59948SChris Mason { 8968b712842SChris Mason /* 8978b712842SChris Mason * when we're called for a write, we're already in the async 8985443be45SChris Mason * submission context. Just jump into btrfs_map_bio 8998b712842SChris Mason */ 90079787eaaSJeff Mahoney return btree_csum_one_bio(bio); 90122c59948SChris Mason } 90222c59948SChris Mason 9034a69a410SChris Mason static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, 904eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 905eaf25d93SChris Mason u64 bio_offset) 9064a69a410SChris Mason { 90761891923SStefan Behrens int ret; 90861891923SStefan Behrens 9098b712842SChris Mason /* 9104a69a410SChris Mason * when we're called for a write, we're already in the async 9114a69a410SChris Mason * submission context. Just jump into btrfs_map_bio 9128b712842SChris Mason */ 91361891923SStefan Behrens ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); 9144246a0b6SChristoph Hellwig if (ret) { 9154246a0b6SChristoph Hellwig bio->bi_error = ret; 9164246a0b6SChristoph Hellwig bio_endio(bio); 9174246a0b6SChristoph Hellwig } 91861891923SStefan Behrens return ret; 9190b86a832SChris Mason } 9200b86a832SChris Mason 921de0022b9SJosef Bacik static int check_async_write(struct inode *inode, unsigned long bio_flags) 922de0022b9SJosef Bacik { 923de0022b9SJosef Bacik if (bio_flags & EXTENT_BIO_TREE_LOG) 924de0022b9SJosef Bacik return 0; 925de0022b9SJosef Bacik #ifdef CONFIG_X86 926de0022b9SJosef Bacik if (cpu_has_xmm4_2) 927de0022b9SJosef Bacik return 0; 928de0022b9SJosef Bacik #endif 929de0022b9SJosef Bacik return 1; 930de0022b9SJosef Bacik } 931de0022b9SJosef Bacik 93244b8bd7eSChris Mason static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 933eaf25d93SChris Mason int mirror_num, unsigned long bio_flags, 934eaf25d93SChris Mason u64 bio_offset) 93544b8bd7eSChris Mason { 936de0022b9SJosef Bacik int async = check_async_write(inode, bio_flags); 9374a69a410SChris Mason int ret; 938cad321adSChris Mason 9397b6d91daSChristoph Hellwig if (!(rw & REQ_WRITE)) { 940cad321adSChris Mason /* 941cad321adSChris Mason * called for a read, do the setup so that checksum validation 942cad321adSChris Mason * can happen in the async kernel threads 943cad321adSChris Mason */ 944f3f266abSChris Mason ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, 945bfebd8b5SDavid Sterba bio, BTRFS_WQ_ENDIO_METADATA); 9461d4284bdSChris Mason if (ret) 94761891923SStefan Behrens goto out_w_error; 94861891923SStefan Behrens ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 9496f3577bdSChris Mason mirror_num, 0); 950de0022b9SJosef Bacik } else if (!async) { 951de0022b9SJosef Bacik ret = btree_csum_one_bio(bio); 952de0022b9SJosef Bacik if (ret) 95361891923SStefan Behrens goto out_w_error; 95461891923SStefan Behrens ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 955de0022b9SJosef Bacik mirror_num, 0); 95661891923SStefan Behrens } else { 957cad321adSChris Mason /* 95861891923SStefan Behrens * kthread helpers are used to submit writes so that 95961891923SStefan Behrens * checksumming can happen in parallel across all CPUs 960cad321adSChris Mason */ 96161891923SStefan Behrens ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, 962c8b97818SChris Mason inode, rw, bio, mirror_num, 0, 963eaf25d93SChris Mason bio_offset, 9644a69a410SChris Mason __btree_submit_bio_start, 9654a69a410SChris Mason __btree_submit_bio_done); 96644b8bd7eSChris Mason } 96744b8bd7eSChris Mason 9684246a0b6SChristoph Hellwig if (ret) 9694246a0b6SChristoph Hellwig goto out_w_error; 9704246a0b6SChristoph Hellwig return 0; 9714246a0b6SChristoph Hellwig 97261891923SStefan Behrens out_w_error: 9734246a0b6SChristoph Hellwig bio->bi_error = ret; 9744246a0b6SChristoph Hellwig bio_endio(bio); 97561891923SStefan Behrens return ret; 97661891923SStefan Behrens } 97761891923SStefan Behrens 9783dd1462eSJan Beulich #ifdef CONFIG_MIGRATION 979784b4e29SChris Mason static int btree_migratepage(struct address_space *mapping, 980a6bc32b8SMel Gorman struct page *newpage, struct page *page, 981a6bc32b8SMel Gorman enum migrate_mode mode) 982784b4e29SChris Mason { 983784b4e29SChris Mason /* 984784b4e29SChris Mason * we can't safely write a btree page from here, 985784b4e29SChris Mason * we haven't done the locking hook 986784b4e29SChris Mason */ 987784b4e29SChris Mason if (PageDirty(page)) 988784b4e29SChris Mason return -EAGAIN; 989784b4e29SChris Mason /* 990784b4e29SChris Mason * Buffers may be managed in a filesystem specific way. 991784b4e29SChris Mason * We must have no buffers or drop them. 992784b4e29SChris Mason */ 993784b4e29SChris Mason if (page_has_private(page) && 994784b4e29SChris Mason !try_to_release_page(page, GFP_KERNEL)) 995784b4e29SChris Mason return -EAGAIN; 996a6bc32b8SMel Gorman return migrate_page(mapping, newpage, page, mode); 997784b4e29SChris Mason } 9983dd1462eSJan Beulich #endif 999784b4e29SChris Mason 10000da5468fSChris Mason 10010da5468fSChris Mason static int btree_writepages(struct address_space *mapping, 10020da5468fSChris Mason struct writeback_control *wbc) 10030da5468fSChris Mason { 1004e2d84521SMiao Xie struct btrfs_fs_info *fs_info; 1005e2d84521SMiao Xie int ret; 1006e2d84521SMiao Xie 1007d8d5f3e1SChris Mason if (wbc->sync_mode == WB_SYNC_NONE) { 1008448d640bSChris Mason 1009448d640bSChris Mason if (wbc->for_kupdate) 1010448d640bSChris Mason return 0; 1011448d640bSChris Mason 1012e2d84521SMiao Xie fs_info = BTRFS_I(mapping->host)->root->fs_info; 1013b9473439SChris Mason /* this is a bit racy, but that's ok */ 1014e2d84521SMiao Xie ret = percpu_counter_compare(&fs_info->dirty_metadata_bytes, 1015e2d84521SMiao Xie BTRFS_DIRTY_METADATA_THRESH); 1016e2d84521SMiao Xie if (ret < 0) 1017793955bcSChris Mason return 0; 1018793955bcSChris Mason } 10190b32f4bbSJosef Bacik return btree_write_cache_pages(mapping, wbc); 10200da5468fSChris Mason } 10210da5468fSChris Mason 1022b2950863SChristoph Hellwig static int btree_readpage(struct file *file, struct page *page) 10235f39d397SChris Mason { 1024d1310b2eSChris Mason struct extent_io_tree *tree; 1025d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 10268ddc7d9cSJan Schmidt return extent_read_full_page(tree, page, btree_get_extent, 0); 10275f39d397SChris Mason } 10285f39d397SChris Mason 102970dec807SChris Mason static int btree_releasepage(struct page *page, gfp_t gfp_flags) 10305f39d397SChris Mason { 103198509cfcSChris Mason if (PageWriteback(page) || PageDirty(page)) 103298509cfcSChris Mason return 0; 10330c4e538bSDavid Sterba 1034f7a52a40SDavid Sterba return try_release_extent_buffer(page); 1035d98237b3SChris Mason } 1036d98237b3SChris Mason 1037d47992f8SLukas Czerner static void btree_invalidatepage(struct page *page, unsigned int offset, 1038d47992f8SLukas Czerner unsigned int length) 1039d98237b3SChris Mason { 1040d1310b2eSChris Mason struct extent_io_tree *tree; 1041d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 10425f39d397SChris Mason extent_invalidatepage(tree, page, offset); 10435f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 10449ad6b7bcSChris Mason if (PagePrivate(page)) { 1045efe120a0SFrank Holton btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info, 1046efe120a0SFrank Holton "page private not zero on page %llu", 1047efe120a0SFrank Holton (unsigned long long)page_offset(page)); 10489ad6b7bcSChris Mason ClearPagePrivate(page); 10499ad6b7bcSChris Mason set_page_private(page, 0); 10509ad6b7bcSChris Mason page_cache_release(page); 10519ad6b7bcSChris Mason } 1052d98237b3SChris Mason } 1053d98237b3SChris Mason 10540b32f4bbSJosef Bacik static int btree_set_page_dirty(struct page *page) 10550b32f4bbSJosef Bacik { 1056bb146eb2SJosef Bacik #ifdef DEBUG 10570b32f4bbSJosef Bacik struct extent_buffer *eb; 10580b32f4bbSJosef Bacik 10590b32f4bbSJosef Bacik BUG_ON(!PagePrivate(page)); 10600b32f4bbSJosef Bacik eb = (struct extent_buffer *)page->private; 10610b32f4bbSJosef Bacik BUG_ON(!eb); 10620b32f4bbSJosef Bacik BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); 10630b32f4bbSJosef Bacik BUG_ON(!atomic_read(&eb->refs)); 10640b32f4bbSJosef Bacik btrfs_assert_tree_locked(eb); 1065bb146eb2SJosef Bacik #endif 10660b32f4bbSJosef Bacik return __set_page_dirty_nobuffers(page); 10670b32f4bbSJosef Bacik } 10680b32f4bbSJosef Bacik 10697f09410bSAlexey Dobriyan static const struct address_space_operations btree_aops = { 1070d98237b3SChris Mason .readpage = btree_readpage, 10710da5468fSChris Mason .writepages = btree_writepages, 10725f39d397SChris Mason .releasepage = btree_releasepage, 10735f39d397SChris Mason .invalidatepage = btree_invalidatepage, 10745a92bc88SChris Mason #ifdef CONFIG_MIGRATION 1075784b4e29SChris Mason .migratepage = btree_migratepage, 10765a92bc88SChris Mason #endif 10770b32f4bbSJosef Bacik .set_page_dirty = btree_set_page_dirty, 1078d98237b3SChris Mason }; 1079123abc88SChris Mason 1080d3e46feaSDavid Sterba void readahead_tree_block(struct btrfs_root *root, u64 bytenr) 1081090d1875SChris Mason { 10825f39d397SChris Mason struct extent_buffer *buf = NULL; 10835f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1084090d1875SChris Mason 1085a83fffb7SDavid Sterba buf = btrfs_find_create_tree_block(root, bytenr); 10865f39d397SChris Mason if (!buf) 10876197d86eSDavid Sterba return; 1088d1310b2eSChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, 1089bb82ab88SArne Jansen buf, 0, WAIT_NONE, btree_get_extent, 0); 10905f39d397SChris Mason free_extent_buffer(buf); 1091090d1875SChris Mason } 1092090d1875SChris Mason 1093c0dcaa4dSDavid Sterba int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, 1094ab0fff03SArne Jansen int mirror_num, struct extent_buffer **eb) 1095ab0fff03SArne Jansen { 1096ab0fff03SArne Jansen struct extent_buffer *buf = NULL; 1097ab0fff03SArne Jansen struct inode *btree_inode = root->fs_info->btree_inode; 1098ab0fff03SArne Jansen struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree; 1099ab0fff03SArne Jansen int ret; 1100ab0fff03SArne Jansen 1101a83fffb7SDavid Sterba buf = btrfs_find_create_tree_block(root, bytenr); 1102ab0fff03SArne Jansen if (!buf) 1103ab0fff03SArne Jansen return 0; 1104ab0fff03SArne Jansen 1105ab0fff03SArne Jansen set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags); 1106ab0fff03SArne Jansen 1107ab0fff03SArne Jansen ret = read_extent_buffer_pages(io_tree, buf, 0, WAIT_PAGE_LOCK, 1108ab0fff03SArne Jansen btree_get_extent, mirror_num); 1109ab0fff03SArne Jansen if (ret) { 1110ab0fff03SArne Jansen free_extent_buffer(buf); 1111ab0fff03SArne Jansen return ret; 1112ab0fff03SArne Jansen } 1113ab0fff03SArne Jansen 1114ab0fff03SArne Jansen if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) { 1115ab0fff03SArne Jansen free_extent_buffer(buf); 1116ab0fff03SArne Jansen return -EIO; 11170b32f4bbSJosef Bacik } else if (extent_buffer_uptodate(buf)) { 1118ab0fff03SArne Jansen *eb = buf; 1119ab0fff03SArne Jansen } else { 1120ab0fff03SArne Jansen free_extent_buffer(buf); 1121ab0fff03SArne Jansen } 1122ab0fff03SArne Jansen return 0; 1123ab0fff03SArne Jansen } 1124ab0fff03SArne Jansen 112501d58472SDaniel Dressler struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info, 11260308af44SDavid Sterba u64 bytenr) 11270999df54SChris Mason { 112801d58472SDaniel Dressler return find_extent_buffer(fs_info, bytenr); 11290999df54SChris Mason } 11300999df54SChris Mason 11310999df54SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 1132a83fffb7SDavid Sterba u64 bytenr) 11330999df54SChris Mason { 1134fccb84c9SDavid Sterba if (btrfs_test_is_dummy_root(root)) 1135ce3e6984SDavid Sterba return alloc_test_extent_buffer(root->fs_info, bytenr); 1136ce3e6984SDavid Sterba return alloc_extent_buffer(root->fs_info, bytenr); 11370999df54SChris Mason } 11380999df54SChris Mason 11390999df54SChris Mason 1140e02119d5SChris Mason int btrfs_write_tree_block(struct extent_buffer *buf) 1141e02119d5SChris Mason { 1142727011e0SChris Mason return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start, 11438aa38c31SChristoph Hellwig buf->start + buf->len - 1); 1144e02119d5SChris Mason } 1145e02119d5SChris Mason 1146e02119d5SChris Mason int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) 1147e02119d5SChris Mason { 1148727011e0SChris Mason return filemap_fdatawait_range(buf->pages[0]->mapping, 11498aa38c31SChristoph Hellwig buf->start, buf->start + buf->len - 1); 1150e02119d5SChris Mason } 1151e02119d5SChris Mason 1152db94535dSChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, 1153ce86cd59SDavid Sterba u64 parent_transid) 1154e20d96d6SChris Mason { 11555f39d397SChris Mason struct extent_buffer *buf = NULL; 115619c00ddcSChris Mason int ret; 115719c00ddcSChris Mason 1158a83fffb7SDavid Sterba buf = btrfs_find_create_tree_block(root, bytenr); 11595f39d397SChris Mason if (!buf) 116064c043deSLiu Bo return ERR_PTR(-ENOMEM); 1161e4204dedSChris Mason 1162ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 11630f0fe8f7SFilipe David Borba Manana if (ret) { 11640f0fe8f7SFilipe David Borba Manana free_extent_buffer(buf); 116564c043deSLiu Bo return ERR_PTR(ret); 11660f0fe8f7SFilipe David Borba Manana } 11675f39d397SChris Mason return buf; 1168ce9adaa5SChris Mason 1169eb60ceacSChris Mason } 1170eb60ceacSChris Mason 117101d58472SDaniel Dressler void clean_tree_block(struct btrfs_trans_handle *trans, 117201d58472SDaniel Dressler struct btrfs_fs_info *fs_info, 11735f39d397SChris Mason struct extent_buffer *buf) 1174ed2ff2cbSChris Mason { 117555c69072SChris Mason if (btrfs_header_generation(buf) == 1176e2d84521SMiao Xie fs_info->running_transaction->transid) { 1177b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 1178b4ce94deSChris Mason 1179b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { 1180e2d84521SMiao Xie __percpu_counter_add(&fs_info->dirty_metadata_bytes, 1181e2d84521SMiao Xie -buf->len, 1182e2d84521SMiao Xie fs_info->dirty_metadata_batch); 1183b9473439SChris Mason /* ugh, clear_extent_buffer_dirty needs to lock the page */ 1184b9473439SChris Mason btrfs_set_lock_blocking(buf); 11850b32f4bbSJosef Bacik clear_extent_buffer_dirty(buf); 1186925baeddSChris Mason } 11875f39d397SChris Mason } 1188ed7b63ebSJosef Bacik } 11895f39d397SChris Mason 11908257b2dcSMiao Xie static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void) 11918257b2dcSMiao Xie { 11928257b2dcSMiao Xie struct btrfs_subvolume_writers *writers; 11938257b2dcSMiao Xie int ret; 11948257b2dcSMiao Xie 11958257b2dcSMiao Xie writers = kmalloc(sizeof(*writers), GFP_NOFS); 11968257b2dcSMiao Xie if (!writers) 11978257b2dcSMiao Xie return ERR_PTR(-ENOMEM); 11988257b2dcSMiao Xie 1199908c7f19STejun Heo ret = percpu_counter_init(&writers->counter, 0, GFP_KERNEL); 12008257b2dcSMiao Xie if (ret < 0) { 12018257b2dcSMiao Xie kfree(writers); 12028257b2dcSMiao Xie return ERR_PTR(ret); 12038257b2dcSMiao Xie } 12048257b2dcSMiao Xie 12058257b2dcSMiao Xie init_waitqueue_head(&writers->wait); 12068257b2dcSMiao Xie return writers; 12078257b2dcSMiao Xie } 12088257b2dcSMiao Xie 12098257b2dcSMiao Xie static void 12108257b2dcSMiao Xie btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers) 12118257b2dcSMiao Xie { 12128257b2dcSMiao Xie percpu_counter_destroy(&writers->counter); 12138257b2dcSMiao Xie kfree(writers); 12148257b2dcSMiao Xie } 12158257b2dcSMiao Xie 1216707e8a07SDavid Sterba static void __setup_root(u32 nodesize, u32 sectorsize, u32 stripesize, 1217707e8a07SDavid Sterba struct btrfs_root *root, struct btrfs_fs_info *fs_info, 1218e20d96d6SChris Mason u64 objectid) 1219d97e63b6SChris Mason { 1220cfaa7295SChris Mason root->node = NULL; 1221a28ec197SChris Mason root->commit_root = NULL; 1222db94535dSChris Mason root->sectorsize = sectorsize; 1223db94535dSChris Mason root->nodesize = nodesize; 122487ee04ebSChris Mason root->stripesize = stripesize; 122527cdeb70SMiao Xie root->state = 0; 1226d68fc57bSYan, Zheng root->orphan_cleanup_state = 0; 12270b86a832SChris Mason 12280f7d52f4SChris Mason root->objectid = objectid; 12290f7d52f4SChris Mason root->last_trans = 0; 123013a8a7c8SYan, Zheng root->highest_objectid = 0; 1231eb73c1b7SMiao Xie root->nr_delalloc_inodes = 0; 1232199c2a9cSMiao Xie root->nr_ordered_extents = 0; 123358176a96SJosef Bacik root->name = NULL; 12346bef4d31SEric Paris root->inode_tree = RB_ROOT; 123516cdcec7SMiao Xie INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC); 1236f0486c68SYan, Zheng root->block_rsv = NULL; 1237d68fc57bSYan, Zheng root->orphan_block_rsv = NULL; 12380b86a832SChris Mason 12390b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 12405d4f98a2SYan Zheng INIT_LIST_HEAD(&root->root_list); 1241eb73c1b7SMiao Xie INIT_LIST_HEAD(&root->delalloc_inodes); 1242eb73c1b7SMiao Xie INIT_LIST_HEAD(&root->delalloc_root); 1243199c2a9cSMiao Xie INIT_LIST_HEAD(&root->ordered_extents); 1244199c2a9cSMiao Xie INIT_LIST_HEAD(&root->ordered_root); 12452ab28f32SJosef Bacik INIT_LIST_HEAD(&root->logged_list[0]); 12462ab28f32SJosef Bacik INIT_LIST_HEAD(&root->logged_list[1]); 1247d68fc57bSYan, Zheng spin_lock_init(&root->orphan_lock); 12485d4f98a2SYan Zheng spin_lock_init(&root->inode_lock); 1249eb73c1b7SMiao Xie spin_lock_init(&root->delalloc_lock); 1250199c2a9cSMiao Xie spin_lock_init(&root->ordered_extent_lock); 1251f0486c68SYan, Zheng spin_lock_init(&root->accounting_lock); 12522ab28f32SJosef Bacik spin_lock_init(&root->log_extents_lock[0]); 12532ab28f32SJosef Bacik spin_lock_init(&root->log_extents_lock[1]); 1254a2135011SChris Mason mutex_init(&root->objectid_mutex); 1255e02119d5SChris Mason mutex_init(&root->log_mutex); 125631f3d255SMiao Xie mutex_init(&root->ordered_extent_mutex); 1257573bfb72SMiao Xie mutex_init(&root->delalloc_mutex); 12587237f183SYan Zheng init_waitqueue_head(&root->log_writer_wait); 12597237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[0]); 12607237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[1]); 12618b050d35SMiao Xie INIT_LIST_HEAD(&root->log_ctxs[0]); 12628b050d35SMiao Xie INIT_LIST_HEAD(&root->log_ctxs[1]); 12637237f183SYan Zheng atomic_set(&root->log_commit[0], 0); 12647237f183SYan Zheng atomic_set(&root->log_commit[1], 0); 12657237f183SYan Zheng atomic_set(&root->log_writers, 0); 12662ecb7923SMiao Xie atomic_set(&root->log_batch, 0); 12678a35d95fSJosef Bacik atomic_set(&root->orphan_inodes, 0); 1268b0feb9d9SMiao Xie atomic_set(&root->refs, 1); 12698257b2dcSMiao Xie atomic_set(&root->will_be_snapshoted, 0); 127055eeaf05SQu Wenruo atomic_set(&root->qgroup_meta_rsv, 0); 12717237f183SYan Zheng root->log_transid = 0; 1272d1433debSMiao Xie root->log_transid_committed = -1; 1273257c62e1SChris Mason root->last_log_commit = 0; 127406ea65a3SJosef Bacik if (fs_info) 1275d0c803c4SChris Mason extent_io_tree_init(&root->dirty_log_pages, 1276f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 1277017e5369SChris Mason 12783768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 12793768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 12806702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 128106ea65a3SJosef Bacik if (fs_info) 12823f157a2fSChris Mason root->defrag_trans_start = fs_info->generation; 128306ea65a3SJosef Bacik else 128406ea65a3SJosef Bacik root->defrag_trans_start = 0; 12854d775673SChris Mason root->root_key.objectid = objectid; 12860ee5dc67SAl Viro root->anon_dev = 0; 12878ea05e3aSAlexander Block 12885f3ab90aSAnand Jain spin_lock_init(&root->root_item_lock); 12893768f368SChris Mason } 12903768f368SChris Mason 1291f84a8bd6SAl Viro static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info) 12926f07e42eSAl Viro { 12936f07e42eSAl Viro struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS); 12946f07e42eSAl Viro if (root) 12956f07e42eSAl Viro root->fs_info = fs_info; 12966f07e42eSAl Viro return root; 12976f07e42eSAl Viro } 12986f07e42eSAl Viro 129906ea65a3SJosef Bacik #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 130006ea65a3SJosef Bacik /* Should only be used by the testing infrastructure */ 130106ea65a3SJosef Bacik struct btrfs_root *btrfs_alloc_dummy_root(void) 130206ea65a3SJosef Bacik { 130306ea65a3SJosef Bacik struct btrfs_root *root; 130406ea65a3SJosef Bacik 130506ea65a3SJosef Bacik root = btrfs_alloc_root(NULL); 130606ea65a3SJosef Bacik if (!root) 130706ea65a3SJosef Bacik return ERR_PTR(-ENOMEM); 1308707e8a07SDavid Sterba __setup_root(4096, 4096, 4096, root, NULL, 1); 130927cdeb70SMiao Xie set_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state); 1310faa2dbf0SJosef Bacik root->alloc_bytenr = 0; 131106ea65a3SJosef Bacik 131206ea65a3SJosef Bacik return root; 131306ea65a3SJosef Bacik } 131406ea65a3SJosef Bacik #endif 131506ea65a3SJosef Bacik 131620897f5cSArne Jansen struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 131720897f5cSArne Jansen struct btrfs_fs_info *fs_info, 131820897f5cSArne Jansen u64 objectid) 131920897f5cSArne Jansen { 132020897f5cSArne Jansen struct extent_buffer *leaf; 132120897f5cSArne Jansen struct btrfs_root *tree_root = fs_info->tree_root; 132220897f5cSArne Jansen struct btrfs_root *root; 132320897f5cSArne Jansen struct btrfs_key key; 132420897f5cSArne Jansen int ret = 0; 13256463fe58SStefan Behrens uuid_le uuid; 132620897f5cSArne Jansen 132720897f5cSArne Jansen root = btrfs_alloc_root(fs_info); 132820897f5cSArne Jansen if (!root) 132920897f5cSArne Jansen return ERR_PTR(-ENOMEM); 133020897f5cSArne Jansen 1331707e8a07SDavid Sterba __setup_root(tree_root->nodesize, tree_root->sectorsize, 1332707e8a07SDavid Sterba tree_root->stripesize, root, fs_info, objectid); 133320897f5cSArne Jansen root->root_key.objectid = objectid; 133420897f5cSArne Jansen root->root_key.type = BTRFS_ROOT_ITEM_KEY; 133520897f5cSArne Jansen root->root_key.offset = 0; 133620897f5cSArne Jansen 13374d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 133820897f5cSArne Jansen if (IS_ERR(leaf)) { 133920897f5cSArne Jansen ret = PTR_ERR(leaf); 13401dd05682STsutomu Itoh leaf = NULL; 134120897f5cSArne Jansen goto fail; 134220897f5cSArne Jansen } 134320897f5cSArne Jansen 134420897f5cSArne Jansen memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 134520897f5cSArne Jansen btrfs_set_header_bytenr(leaf, leaf->start); 134620897f5cSArne Jansen btrfs_set_header_generation(leaf, trans->transid); 134720897f5cSArne Jansen btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 134820897f5cSArne Jansen btrfs_set_header_owner(leaf, objectid); 134920897f5cSArne Jansen root->node = leaf; 135020897f5cSArne Jansen 13510a4e5586SRoss Kirk write_extent_buffer(leaf, fs_info->fsid, btrfs_header_fsid(), 135220897f5cSArne Jansen BTRFS_FSID_SIZE); 135320897f5cSArne Jansen write_extent_buffer(leaf, fs_info->chunk_tree_uuid, 1354b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(leaf), 135520897f5cSArne Jansen BTRFS_UUID_SIZE); 135620897f5cSArne Jansen btrfs_mark_buffer_dirty(leaf); 135720897f5cSArne Jansen 135820897f5cSArne Jansen root->commit_root = btrfs_root_node(root); 135927cdeb70SMiao Xie set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 136020897f5cSArne Jansen 136120897f5cSArne Jansen root->root_item.flags = 0; 136220897f5cSArne Jansen root->root_item.byte_limit = 0; 136320897f5cSArne Jansen btrfs_set_root_bytenr(&root->root_item, leaf->start); 136420897f5cSArne Jansen btrfs_set_root_generation(&root->root_item, trans->transid); 136520897f5cSArne Jansen btrfs_set_root_level(&root->root_item, 0); 136620897f5cSArne Jansen btrfs_set_root_refs(&root->root_item, 1); 136720897f5cSArne Jansen btrfs_set_root_used(&root->root_item, leaf->len); 136820897f5cSArne Jansen btrfs_set_root_last_snapshot(&root->root_item, 0); 136920897f5cSArne Jansen btrfs_set_root_dirid(&root->root_item, 0); 13706463fe58SStefan Behrens uuid_le_gen(&uuid); 13716463fe58SStefan Behrens memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE); 137220897f5cSArne Jansen root->root_item.drop_level = 0; 137320897f5cSArne Jansen 137420897f5cSArne Jansen key.objectid = objectid; 137520897f5cSArne Jansen key.type = BTRFS_ROOT_ITEM_KEY; 137620897f5cSArne Jansen key.offset = 0; 137720897f5cSArne Jansen ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item); 137820897f5cSArne Jansen if (ret) 137920897f5cSArne Jansen goto fail; 138020897f5cSArne Jansen 138120897f5cSArne Jansen btrfs_tree_unlock(leaf); 138220897f5cSArne Jansen 138320897f5cSArne Jansen return root; 13841dd05682STsutomu Itoh 13851dd05682STsutomu Itoh fail: 13861dd05682STsutomu Itoh if (leaf) { 13871dd05682STsutomu Itoh btrfs_tree_unlock(leaf); 138859885b39STsutomu Itoh free_extent_buffer(root->commit_root); 13891dd05682STsutomu Itoh free_extent_buffer(leaf); 13901dd05682STsutomu Itoh } 13911dd05682STsutomu Itoh kfree(root); 13921dd05682STsutomu Itoh 13931dd05682STsutomu Itoh return ERR_PTR(ret); 139420897f5cSArne Jansen } 139520897f5cSArne Jansen 13967237f183SYan Zheng static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, 1397e02119d5SChris Mason struct btrfs_fs_info *fs_info) 13980f7d52f4SChris Mason { 13990f7d52f4SChris Mason struct btrfs_root *root; 14000f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 14017237f183SYan Zheng struct extent_buffer *leaf; 1402e02119d5SChris Mason 14036f07e42eSAl Viro root = btrfs_alloc_root(fs_info); 1404e02119d5SChris Mason if (!root) 14057237f183SYan Zheng return ERR_PTR(-ENOMEM); 1406e02119d5SChris Mason 1407707e8a07SDavid Sterba __setup_root(tree_root->nodesize, tree_root->sectorsize, 1408707e8a07SDavid Sterba tree_root->stripesize, root, fs_info, 1409707e8a07SDavid Sterba BTRFS_TREE_LOG_OBJECTID); 1410e02119d5SChris Mason 1411e02119d5SChris Mason root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; 1412e02119d5SChris Mason root->root_key.type = BTRFS_ROOT_ITEM_KEY; 1413e02119d5SChris Mason root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; 141427cdeb70SMiao Xie 14157237f183SYan Zheng /* 141627cdeb70SMiao Xie * DON'T set REF_COWS for log trees 141727cdeb70SMiao Xie * 14187237f183SYan Zheng * log trees do not get reference counted because they go away 14197237f183SYan Zheng * before a real commit is actually done. They do store pointers 14207237f183SYan Zheng * to file data extents, and those reference counts still get 14217237f183SYan Zheng * updated (along with back refs to the log tree). 14227237f183SYan Zheng */ 1423e02119d5SChris Mason 14244d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID, 14254d75f8a9SDavid Sterba NULL, 0, 0, 0); 14267237f183SYan Zheng if (IS_ERR(leaf)) { 14277237f183SYan Zheng kfree(root); 14287237f183SYan Zheng return ERR_CAST(leaf); 14297237f183SYan Zheng } 1430e02119d5SChris Mason 14315d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 14325d4f98a2SYan Zheng btrfs_set_header_bytenr(leaf, leaf->start); 14335d4f98a2SYan Zheng btrfs_set_header_generation(leaf, trans->transid); 14345d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 14355d4f98a2SYan Zheng btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); 14367237f183SYan Zheng root->node = leaf; 1437e02119d5SChris Mason 1438e02119d5SChris Mason write_extent_buffer(root->node, root->fs_info->fsid, 14390a4e5586SRoss Kirk btrfs_header_fsid(), BTRFS_FSID_SIZE); 1440e02119d5SChris Mason btrfs_mark_buffer_dirty(root->node); 1441e02119d5SChris Mason btrfs_tree_unlock(root->node); 14427237f183SYan Zheng return root; 14437237f183SYan Zheng } 14447237f183SYan Zheng 14457237f183SYan Zheng int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 14467237f183SYan Zheng struct btrfs_fs_info *fs_info) 14477237f183SYan Zheng { 14487237f183SYan Zheng struct btrfs_root *log_root; 14497237f183SYan Zheng 14507237f183SYan Zheng log_root = alloc_log_tree(trans, fs_info); 14517237f183SYan Zheng if (IS_ERR(log_root)) 14527237f183SYan Zheng return PTR_ERR(log_root); 14537237f183SYan Zheng WARN_ON(fs_info->log_root_tree); 14547237f183SYan Zheng fs_info->log_root_tree = log_root; 14557237f183SYan Zheng return 0; 14567237f183SYan Zheng } 14577237f183SYan Zheng 14587237f183SYan Zheng int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 14597237f183SYan Zheng struct btrfs_root *root) 14607237f183SYan Zheng { 14617237f183SYan Zheng struct btrfs_root *log_root; 14627237f183SYan Zheng struct btrfs_inode_item *inode_item; 14637237f183SYan Zheng 14647237f183SYan Zheng log_root = alloc_log_tree(trans, root->fs_info); 14657237f183SYan Zheng if (IS_ERR(log_root)) 14667237f183SYan Zheng return PTR_ERR(log_root); 14677237f183SYan Zheng 14687237f183SYan Zheng log_root->last_trans = trans->transid; 14697237f183SYan Zheng log_root->root_key.offset = root->root_key.objectid; 14707237f183SYan Zheng 14717237f183SYan Zheng inode_item = &log_root->root_item.inode; 14723cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 14733cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 14743cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 1475707e8a07SDavid Sterba btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); 14763cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 14777237f183SYan Zheng 14785d4f98a2SYan Zheng btrfs_set_root_node(&log_root->root_item, log_root->node); 14797237f183SYan Zheng 14807237f183SYan Zheng WARN_ON(root->log_root); 14817237f183SYan Zheng root->log_root = log_root; 14827237f183SYan Zheng root->log_transid = 0; 1483d1433debSMiao Xie root->log_transid_committed = -1; 1484257c62e1SChris Mason root->last_log_commit = 0; 1485e02119d5SChris Mason return 0; 1486e02119d5SChris Mason } 1487e02119d5SChris Mason 148835a3621bSStefan Behrens static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 1489cb517eabSMiao Xie struct btrfs_key *key) 1490e02119d5SChris Mason { 1491e02119d5SChris Mason struct btrfs_root *root; 1492e02119d5SChris Mason struct btrfs_fs_info *fs_info = tree_root->fs_info; 14930f7d52f4SChris Mason struct btrfs_path *path; 149484234f3aSYan Zheng u64 generation; 1495cb517eabSMiao Xie int ret; 1496cb517eabSMiao Xie 1497cb517eabSMiao Xie path = btrfs_alloc_path(); 1498cb517eabSMiao Xie if (!path) 1499cb517eabSMiao Xie return ERR_PTR(-ENOMEM); 15000f7d52f4SChris Mason 15016f07e42eSAl Viro root = btrfs_alloc_root(fs_info); 1502cb517eabSMiao Xie if (!root) { 1503cb517eabSMiao Xie ret = -ENOMEM; 1504cb517eabSMiao Xie goto alloc_fail; 15050f7d52f4SChris Mason } 15060f7d52f4SChris Mason 1507707e8a07SDavid Sterba __setup_root(tree_root->nodesize, tree_root->sectorsize, 1508707e8a07SDavid Sterba tree_root->stripesize, root, fs_info, key->objectid); 15090f7d52f4SChris Mason 1510cb517eabSMiao Xie ret = btrfs_find_root(tree_root, key, path, 1511cb517eabSMiao Xie &root->root_item, &root->root_key); 15120f7d52f4SChris Mason if (ret) { 151313a8a7c8SYan, Zheng if (ret > 0) 151413a8a7c8SYan, Zheng ret = -ENOENT; 1515cb517eabSMiao Xie goto find_fail; 15160f7d52f4SChris Mason } 151713a8a7c8SYan, Zheng 151884234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1519db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 1520ce86cd59SDavid Sterba generation); 152164c043deSLiu Bo if (IS_ERR(root->node)) { 152264c043deSLiu Bo ret = PTR_ERR(root->node); 1523cb517eabSMiao Xie goto find_fail; 1524cb517eabSMiao Xie } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) { 1525cb517eabSMiao Xie ret = -EIO; 152664c043deSLiu Bo free_extent_buffer(root->node); 152764c043deSLiu Bo goto find_fail; 1528416bc658SJosef Bacik } 15295d4f98a2SYan Zheng root->commit_root = btrfs_root_node(root); 153013a8a7c8SYan, Zheng out: 1531cb517eabSMiao Xie btrfs_free_path(path); 1532cb517eabSMiao Xie return root; 1533cb517eabSMiao Xie 1534cb517eabSMiao Xie find_fail: 1535cb517eabSMiao Xie kfree(root); 1536cb517eabSMiao Xie alloc_fail: 1537cb517eabSMiao Xie root = ERR_PTR(ret); 1538cb517eabSMiao Xie goto out; 1539cb517eabSMiao Xie } 1540cb517eabSMiao Xie 1541cb517eabSMiao Xie struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root, 1542cb517eabSMiao Xie struct btrfs_key *location) 1543cb517eabSMiao Xie { 1544cb517eabSMiao Xie struct btrfs_root *root; 1545cb517eabSMiao Xie 1546cb517eabSMiao Xie root = btrfs_read_tree_root(tree_root, location); 1547cb517eabSMiao Xie if (IS_ERR(root)) 1548cb517eabSMiao Xie return root; 1549cb517eabSMiao Xie 1550cb517eabSMiao Xie if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { 155127cdeb70SMiao Xie set_bit(BTRFS_ROOT_REF_COWS, &root->state); 155208fe4db1SLi Zefan btrfs_check_and_init_root_item(&root->root_item); 155308fe4db1SLi Zefan } 155413a8a7c8SYan, Zheng 15555eda7b5eSChris Mason return root; 15565eda7b5eSChris Mason } 15575eda7b5eSChris Mason 1558cb517eabSMiao Xie int btrfs_init_fs_root(struct btrfs_root *root) 1559cb517eabSMiao Xie { 1560cb517eabSMiao Xie int ret; 15618257b2dcSMiao Xie struct btrfs_subvolume_writers *writers; 1562cb517eabSMiao Xie 1563cb517eabSMiao Xie root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS); 1564cb517eabSMiao Xie root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned), 1565cb517eabSMiao Xie GFP_NOFS); 1566cb517eabSMiao Xie if (!root->free_ino_pinned || !root->free_ino_ctl) { 1567cb517eabSMiao Xie ret = -ENOMEM; 1568cb517eabSMiao Xie goto fail; 1569cb517eabSMiao Xie } 1570cb517eabSMiao Xie 15718257b2dcSMiao Xie writers = btrfs_alloc_subvolume_writers(); 15728257b2dcSMiao Xie if (IS_ERR(writers)) { 15738257b2dcSMiao Xie ret = PTR_ERR(writers); 15748257b2dcSMiao Xie goto fail; 15758257b2dcSMiao Xie } 15768257b2dcSMiao Xie root->subv_writers = writers; 15778257b2dcSMiao Xie 1578cb517eabSMiao Xie btrfs_init_free_ino_ctl(root); 157957cdc8dbSDavid Sterba spin_lock_init(&root->ino_cache_lock); 158057cdc8dbSDavid Sterba init_waitqueue_head(&root->ino_cache_wait); 1581cb517eabSMiao Xie 1582cb517eabSMiao Xie ret = get_anon_bdev(&root->anon_dev); 1583cb517eabSMiao Xie if (ret) 15848257b2dcSMiao Xie goto free_writers; 1585f32e48e9SChandan Rajendra 1586f32e48e9SChandan Rajendra mutex_lock(&root->objectid_mutex); 1587f32e48e9SChandan Rajendra ret = btrfs_find_highest_objectid(root, 1588f32e48e9SChandan Rajendra &root->highest_objectid); 1589f32e48e9SChandan Rajendra if (ret) { 1590f32e48e9SChandan Rajendra mutex_unlock(&root->objectid_mutex); 1591f32e48e9SChandan Rajendra goto free_root_dev; 1592f32e48e9SChandan Rajendra } 1593f32e48e9SChandan Rajendra 1594f32e48e9SChandan Rajendra ASSERT(root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID); 1595f32e48e9SChandan Rajendra 1596f32e48e9SChandan Rajendra mutex_unlock(&root->objectid_mutex); 1597f32e48e9SChandan Rajendra 1598cb517eabSMiao Xie return 0; 15998257b2dcSMiao Xie 1600f32e48e9SChandan Rajendra free_root_dev: 1601f32e48e9SChandan Rajendra free_anon_bdev(root->anon_dev); 16028257b2dcSMiao Xie free_writers: 16038257b2dcSMiao Xie btrfs_free_subvolume_writers(root->subv_writers); 1604cb517eabSMiao Xie fail: 1605cb517eabSMiao Xie kfree(root->free_ino_ctl); 1606cb517eabSMiao Xie kfree(root->free_ino_pinned); 1607cb517eabSMiao Xie return ret; 1608cb517eabSMiao Xie } 1609cb517eabSMiao Xie 1610171170c1SSergei Trofimovich static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, 1611cb517eabSMiao Xie u64 root_id) 1612cb517eabSMiao Xie { 1613cb517eabSMiao Xie struct btrfs_root *root; 1614cb517eabSMiao Xie 1615cb517eabSMiao Xie spin_lock(&fs_info->fs_roots_radix_lock); 1616cb517eabSMiao Xie root = radix_tree_lookup(&fs_info->fs_roots_radix, 1617cb517eabSMiao Xie (unsigned long)root_id); 1618cb517eabSMiao Xie spin_unlock(&fs_info->fs_roots_radix_lock); 1619cb517eabSMiao Xie return root; 1620cb517eabSMiao Xie } 1621cb517eabSMiao Xie 1622cb517eabSMiao Xie int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, 1623cb517eabSMiao Xie struct btrfs_root *root) 1624cb517eabSMiao Xie { 1625cb517eabSMiao Xie int ret; 1626cb517eabSMiao Xie 1627cb517eabSMiao Xie ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); 1628cb517eabSMiao Xie if (ret) 1629cb517eabSMiao Xie return ret; 1630cb517eabSMiao Xie 1631cb517eabSMiao Xie spin_lock(&fs_info->fs_roots_radix_lock); 1632cb517eabSMiao Xie ret = radix_tree_insert(&fs_info->fs_roots_radix, 1633cb517eabSMiao Xie (unsigned long)root->root_key.objectid, 1634cb517eabSMiao Xie root); 1635cb517eabSMiao Xie if (ret == 0) 163627cdeb70SMiao Xie set_bit(BTRFS_ROOT_IN_RADIX, &root->state); 1637cb517eabSMiao Xie spin_unlock(&fs_info->fs_roots_radix_lock); 1638cb517eabSMiao Xie radix_tree_preload_end(); 1639cb517eabSMiao Xie 1640cb517eabSMiao Xie return ret; 1641cb517eabSMiao Xie } 1642cb517eabSMiao Xie 1643c00869f1SMiao Xie struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 1644c00869f1SMiao Xie struct btrfs_key *location, 1645c00869f1SMiao Xie bool check_ref) 16465eda7b5eSChris Mason { 16475eda7b5eSChris Mason struct btrfs_root *root; 1648381cf658SDavid Sterba struct btrfs_path *path; 16491d4c08e0SDavid Sterba struct btrfs_key key; 16505eda7b5eSChris Mason int ret; 16515eda7b5eSChris Mason 1652edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 1653edbd8d4eSChris Mason return fs_info->tree_root; 1654edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 1655edbd8d4eSChris Mason return fs_info->extent_root; 16568f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 16578f18cf13SChris Mason return fs_info->chunk_root; 16588f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 16598f18cf13SChris Mason return fs_info->dev_root; 16600403e47eSYan Zheng if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) 16610403e47eSYan Zheng return fs_info->csum_root; 1662bcef60f2SArne Jansen if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID) 1663bcef60f2SArne Jansen return fs_info->quota_root ? fs_info->quota_root : 1664bcef60f2SArne Jansen ERR_PTR(-ENOENT); 1665f7a81ea4SStefan Behrens if (location->objectid == BTRFS_UUID_TREE_OBJECTID) 1666f7a81ea4SStefan Behrens return fs_info->uuid_root ? fs_info->uuid_root : 1667f7a81ea4SStefan Behrens ERR_PTR(-ENOENT); 16684df27c4dSYan, Zheng again: 1669cb517eabSMiao Xie root = btrfs_lookup_fs_root(fs_info, location->objectid); 167048475471SStefan Behrens if (root) { 1671c00869f1SMiao Xie if (check_ref && btrfs_root_refs(&root->root_item) == 0) 167248475471SStefan Behrens return ERR_PTR(-ENOENT); 16735eda7b5eSChris Mason return root; 167448475471SStefan Behrens } 16755eda7b5eSChris Mason 1676cb517eabSMiao Xie root = btrfs_read_fs_root(fs_info->tree_root, location); 16775eda7b5eSChris Mason if (IS_ERR(root)) 16785eda7b5eSChris Mason return root; 16793394e160SChris Mason 1680c00869f1SMiao Xie if (check_ref && btrfs_root_refs(&root->root_item) == 0) { 1681d68fc57bSYan, Zheng ret = -ENOENT; 1682d68fc57bSYan, Zheng goto fail; 1683d68fc57bSYan, Zheng } 1684d68fc57bSYan, Zheng 1685cb517eabSMiao Xie ret = btrfs_init_fs_root(root); 1686cb517eabSMiao Xie if (ret) 1687cb517eabSMiao Xie goto fail; 1688cb517eabSMiao Xie 1689381cf658SDavid Sterba path = btrfs_alloc_path(); 1690381cf658SDavid Sterba if (!path) { 1691381cf658SDavid Sterba ret = -ENOMEM; 1692381cf658SDavid Sterba goto fail; 1693381cf658SDavid Sterba } 16941d4c08e0SDavid Sterba key.objectid = BTRFS_ORPHAN_OBJECTID; 16951d4c08e0SDavid Sterba key.type = BTRFS_ORPHAN_ITEM_KEY; 16961d4c08e0SDavid Sterba key.offset = location->objectid; 16971d4c08e0SDavid Sterba 16981d4c08e0SDavid Sterba ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 1699381cf658SDavid Sterba btrfs_free_path(path); 1700d68fc57bSYan, Zheng if (ret < 0) 1701d68fc57bSYan, Zheng goto fail; 1702d68fc57bSYan, Zheng if (ret == 0) 170327cdeb70SMiao Xie set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state); 1704d68fc57bSYan, Zheng 1705cb517eabSMiao Xie ret = btrfs_insert_fs_root(fs_info, root); 17060f7d52f4SChris Mason if (ret) { 17074df27c4dSYan, Zheng if (ret == -EEXIST) { 17084df27c4dSYan, Zheng free_fs_root(root); 17094df27c4dSYan, Zheng goto again; 17100f7d52f4SChris Mason } 17114df27c4dSYan, Zheng goto fail; 17124df27c4dSYan, Zheng } 1713edbd8d4eSChris Mason return root; 17144df27c4dSYan, Zheng fail: 17154df27c4dSYan, Zheng free_fs_root(root); 17164df27c4dSYan, Zheng return ERR_PTR(ret); 1717edbd8d4eSChris Mason } 1718edbd8d4eSChris Mason 171904160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 172004160088SChris Mason { 172104160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 172204160088SChris Mason int ret = 0; 172304160088SChris Mason struct btrfs_device *device; 172404160088SChris Mason struct backing_dev_info *bdi; 1725b7967db7SChris Mason 17261f78160cSXiao Guangrong rcu_read_lock(); 17271f78160cSXiao Guangrong list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) { 1728dfe25020SChris Mason if (!device->bdev) 1729dfe25020SChris Mason continue; 173004160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 1731ff9ea323STejun Heo if (bdi_congested(bdi, bdi_bits)) { 173204160088SChris Mason ret = 1; 173304160088SChris Mason break; 173404160088SChris Mason } 173504160088SChris Mason } 17361f78160cSXiao Guangrong rcu_read_unlock(); 173704160088SChris Mason return ret; 173804160088SChris Mason } 173904160088SChris Mason 174004160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 174104160088SChris Mason { 1742ad081f14SJens Axboe int err; 1743ad081f14SJens Axboe 1744b4caecd4SChristoph Hellwig err = bdi_setup_and_register(bdi, "btrfs"); 1745ad081f14SJens Axboe if (err) 1746ad081f14SJens Axboe return err; 1747ad081f14SJens Axboe 1748df0ce26cSChristoph Hellwig bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE; 174904160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 175004160088SChris Mason bdi->congested_data = info; 1751da2f0f74SChris Mason bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK; 175204160088SChris Mason return 0; 175304160088SChris Mason } 175404160088SChris Mason 17558b712842SChris Mason /* 17568b712842SChris Mason * called by the kthread helper functions to finally call the bio end_io 17578b712842SChris Mason * functions. This is where read checksum verification actually happens 17588b712842SChris Mason */ 17598b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work) 1760ce9adaa5SChris Mason { 1761ce9adaa5SChris Mason struct bio *bio; 176297eb6b69SDavid Sterba struct btrfs_end_io_wq *end_io_wq; 1763ce9adaa5SChris Mason 176497eb6b69SDavid Sterba end_io_wq = container_of(work, struct btrfs_end_io_wq, work); 1765ce9adaa5SChris Mason bio = end_io_wq->bio; 17668b712842SChris Mason 17674246a0b6SChristoph Hellwig bio->bi_error = end_io_wq->error; 1768ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1769ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 177097eb6b69SDavid Sterba kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq); 17714246a0b6SChristoph Hellwig bio_endio(bio); 1772ce9adaa5SChris Mason } 177344b8bd7eSChris Mason 1774a74a4b97SChris Mason static int cleaner_kthread(void *arg) 1775a74a4b97SChris Mason { 1776a74a4b97SChris Mason struct btrfs_root *root = arg; 1777d0278245SMiao Xie int again; 1778da288d28SFilipe Manana struct btrfs_trans_handle *trans; 1779a74a4b97SChris Mason 178069624913SJiri Kosina set_freezable(); 1781a74a4b97SChris Mason do { 1782d0278245SMiao Xie again = 0; 17839d1a2a3aSDavid Sterba 1784d0278245SMiao Xie /* Make the cleaner go to sleep early. */ 1785babbf170SMiao Xie if (btrfs_need_cleaner_sleep(root)) 1786d0278245SMiao Xie goto sleep; 1787d0278245SMiao Xie 1788d0278245SMiao Xie if (!mutex_trylock(&root->fs_info->cleaner_mutex)) 1789d0278245SMiao Xie goto sleep; 1790d0278245SMiao Xie 1791dc7f370cSMiao Xie /* 1792dc7f370cSMiao Xie * Avoid the problem that we change the status of the fs 1793dc7f370cSMiao Xie * during the above check and trylock. 1794dc7f370cSMiao Xie */ 1795babbf170SMiao Xie if (btrfs_need_cleaner_sleep(root)) { 1796dc7f370cSMiao Xie mutex_unlock(&root->fs_info->cleaner_mutex); 1797dc7f370cSMiao Xie goto sleep; 1798dc7f370cSMiao Xie } 1799dc7f370cSMiao Xie 180024bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 18019d1a2a3aSDavid Sterba again = btrfs_clean_one_deleted_snapshot(root); 1802a74a4b97SChris Mason mutex_unlock(&root->fs_info->cleaner_mutex); 1803a74a4b97SChris Mason 1804d0278245SMiao Xie /* 180505323cd1SMiao Xie * The defragger has dealt with the R/O remount and umount, 180605323cd1SMiao Xie * needn't do anything special here. 1807d0278245SMiao Xie */ 1808d0278245SMiao Xie btrfs_run_defrag_inodes(root->fs_info); 180967c5e7d4SFilipe Manana 181067c5e7d4SFilipe Manana /* 181167c5e7d4SFilipe Manana * Acquires fs_info->delete_unused_bgs_mutex to avoid racing 181267c5e7d4SFilipe Manana * with relocation (btrfs_relocate_chunk) and relocation 181367c5e7d4SFilipe Manana * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group) 181467c5e7d4SFilipe Manana * after acquiring fs_info->delete_unused_bgs_mutex. So we 181567c5e7d4SFilipe Manana * can't hold, nor need to, fs_info->cleaner_mutex when deleting 181667c5e7d4SFilipe Manana * unused block groups. 181767c5e7d4SFilipe Manana */ 181867c5e7d4SFilipe Manana btrfs_delete_unused_bgs(root->fs_info); 1819d0278245SMiao Xie sleep: 18209d1a2a3aSDavid Sterba if (!try_to_freeze() && !again) { 1821a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 18228929ecfaSYan, Zheng if (!kthread_should_stop()) 1823a74a4b97SChris Mason schedule(); 1824a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1825a74a4b97SChris Mason } 1826a74a4b97SChris Mason } while (!kthread_should_stop()); 1827da288d28SFilipe Manana 1828da288d28SFilipe Manana /* 1829da288d28SFilipe Manana * Transaction kthread is stopped before us and wakes us up. 1830da288d28SFilipe Manana * However we might have started a new transaction and COWed some 1831da288d28SFilipe Manana * tree blocks when deleting unused block groups for example. So 1832da288d28SFilipe Manana * make sure we commit the transaction we started to have a clean 1833da288d28SFilipe Manana * shutdown when evicting the btree inode - if it has dirty pages 1834da288d28SFilipe Manana * when we do the final iput() on it, eviction will trigger a 1835da288d28SFilipe Manana * writeback for it which will fail with null pointer dereferences 1836da288d28SFilipe Manana * since work queues and other resources were already released and 1837da288d28SFilipe Manana * destroyed by the time the iput/eviction/writeback is made. 1838da288d28SFilipe Manana */ 1839da288d28SFilipe Manana trans = btrfs_attach_transaction(root); 1840da288d28SFilipe Manana if (IS_ERR(trans)) { 1841da288d28SFilipe Manana if (PTR_ERR(trans) != -ENOENT) 1842da288d28SFilipe Manana btrfs_err(root->fs_info, 1843da288d28SFilipe Manana "cleaner transaction attach returned %ld", 1844da288d28SFilipe Manana PTR_ERR(trans)); 1845da288d28SFilipe Manana } else { 1846da288d28SFilipe Manana int ret; 1847da288d28SFilipe Manana 1848da288d28SFilipe Manana ret = btrfs_commit_transaction(trans, root); 1849da288d28SFilipe Manana if (ret) 1850da288d28SFilipe Manana btrfs_err(root->fs_info, 1851da288d28SFilipe Manana "cleaner open transaction commit returned %d", 1852da288d28SFilipe Manana ret); 1853da288d28SFilipe Manana } 1854da288d28SFilipe Manana 1855a74a4b97SChris Mason return 0; 1856a74a4b97SChris Mason } 1857a74a4b97SChris Mason 1858a74a4b97SChris Mason static int transaction_kthread(void *arg) 1859a74a4b97SChris Mason { 1860a74a4b97SChris Mason struct btrfs_root *root = arg; 1861a74a4b97SChris Mason struct btrfs_trans_handle *trans; 1862a74a4b97SChris Mason struct btrfs_transaction *cur; 18638929ecfaSYan, Zheng u64 transid; 1864a74a4b97SChris Mason unsigned long now; 1865a74a4b97SChris Mason unsigned long delay; 1866914b2007SJan Kara bool cannot_commit; 1867a74a4b97SChris Mason 1868a74a4b97SChris Mason do { 1869914b2007SJan Kara cannot_commit = false; 18708b87dc17SDavid Sterba delay = HZ * root->fs_info->commit_interval; 1871a74a4b97SChris Mason mutex_lock(&root->fs_info->transaction_kthread_mutex); 1872a74a4b97SChris Mason 1873a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1874a74a4b97SChris Mason cur = root->fs_info->running_transaction; 1875a74a4b97SChris Mason if (!cur) { 1876a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1877a74a4b97SChris Mason goto sleep; 1878a74a4b97SChris Mason } 187931153d81SYan Zheng 1880a74a4b97SChris Mason now = get_seconds(); 18814a9d8bdeSMiao Xie if (cur->state < TRANS_STATE_BLOCKED && 18828b87dc17SDavid Sterba (now < cur->start_time || 18838b87dc17SDavid Sterba now - cur->start_time < root->fs_info->commit_interval)) { 1884a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1885a74a4b97SChris Mason delay = HZ * 5; 1886a74a4b97SChris Mason goto sleep; 1887a74a4b97SChris Mason } 18888929ecfaSYan, Zheng transid = cur->transid; 1889a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 189056bec294SChris Mason 189179787eaaSJeff Mahoney /* If the file system is aborted, this will always fail. */ 1892354aa0fbSMiao Xie trans = btrfs_attach_transaction(root); 1893914b2007SJan Kara if (IS_ERR(trans)) { 1894354aa0fbSMiao Xie if (PTR_ERR(trans) != -ENOENT) 1895914b2007SJan Kara cannot_commit = true; 189679787eaaSJeff Mahoney goto sleep; 1897914b2007SJan Kara } 18988929ecfaSYan, Zheng if (transid == trans->transid) { 189979787eaaSJeff Mahoney btrfs_commit_transaction(trans, root); 19008929ecfaSYan, Zheng } else { 19018929ecfaSYan, Zheng btrfs_end_transaction(trans, root); 19028929ecfaSYan, Zheng } 1903a74a4b97SChris Mason sleep: 1904a74a4b97SChris Mason wake_up_process(root->fs_info->cleaner_kthread); 1905a74a4b97SChris Mason mutex_unlock(&root->fs_info->transaction_kthread_mutex); 1906a74a4b97SChris Mason 19074e121c06SJosef Bacik if (unlikely(test_bit(BTRFS_FS_STATE_ERROR, 19084e121c06SJosef Bacik &root->fs_info->fs_state))) 19094e121c06SJosef Bacik btrfs_cleanup_transaction(root); 1910a0acae0eSTejun Heo if (!try_to_freeze()) { 1911a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 19128929ecfaSYan, Zheng if (!kthread_should_stop() && 1913914b2007SJan Kara (!btrfs_transaction_blocked(root->fs_info) || 1914914b2007SJan Kara cannot_commit)) 1915a74a4b97SChris Mason schedule_timeout(delay); 1916a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1917a74a4b97SChris Mason } 1918a74a4b97SChris Mason } while (!kthread_should_stop()); 1919a74a4b97SChris Mason return 0; 1920a74a4b97SChris Mason } 1921a74a4b97SChris Mason 1922af31f5e5SChris Mason /* 1923af31f5e5SChris Mason * this will find the highest generation in the array of 1924af31f5e5SChris Mason * root backups. The index of the highest array is returned, 1925af31f5e5SChris Mason * or -1 if we can't find anything. 1926af31f5e5SChris Mason * 1927af31f5e5SChris Mason * We check to make sure the array is valid by comparing the 1928af31f5e5SChris Mason * generation of the latest root in the array with the generation 1929af31f5e5SChris Mason * in the super block. If they don't match we pitch it. 1930af31f5e5SChris Mason */ 1931af31f5e5SChris Mason static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen) 1932af31f5e5SChris Mason { 1933af31f5e5SChris Mason u64 cur; 1934af31f5e5SChris Mason int newest_index = -1; 1935af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1936af31f5e5SChris Mason int i; 1937af31f5e5SChris Mason 1938af31f5e5SChris Mason for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { 1939af31f5e5SChris Mason root_backup = info->super_copy->super_roots + i; 1940af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1941af31f5e5SChris Mason if (cur == newest_gen) 1942af31f5e5SChris Mason newest_index = i; 1943af31f5e5SChris Mason } 1944af31f5e5SChris Mason 1945af31f5e5SChris Mason /* check to see if we actually wrapped around */ 1946af31f5e5SChris Mason if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) { 1947af31f5e5SChris Mason root_backup = info->super_copy->super_roots; 1948af31f5e5SChris Mason cur = btrfs_backup_tree_root_gen(root_backup); 1949af31f5e5SChris Mason if (cur == newest_gen) 1950af31f5e5SChris Mason newest_index = 0; 1951af31f5e5SChris Mason } 1952af31f5e5SChris Mason return newest_index; 1953af31f5e5SChris Mason } 1954af31f5e5SChris Mason 1955af31f5e5SChris Mason 1956af31f5e5SChris Mason /* 1957af31f5e5SChris Mason * find the oldest backup so we know where to store new entries 1958af31f5e5SChris Mason * in the backup array. This will set the backup_root_index 1959af31f5e5SChris Mason * field in the fs_info struct 1960af31f5e5SChris Mason */ 1961af31f5e5SChris Mason static void find_oldest_super_backup(struct btrfs_fs_info *info, 1962af31f5e5SChris Mason u64 newest_gen) 1963af31f5e5SChris Mason { 1964af31f5e5SChris Mason int newest_index = -1; 1965af31f5e5SChris Mason 1966af31f5e5SChris Mason newest_index = find_newest_super_backup(info, newest_gen); 1967af31f5e5SChris Mason /* if there was garbage in there, just move along */ 1968af31f5e5SChris Mason if (newest_index == -1) { 1969af31f5e5SChris Mason info->backup_root_index = 0; 1970af31f5e5SChris Mason } else { 1971af31f5e5SChris Mason info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS; 1972af31f5e5SChris Mason } 1973af31f5e5SChris Mason } 1974af31f5e5SChris Mason 1975af31f5e5SChris Mason /* 1976af31f5e5SChris Mason * copy all the root pointers into the super backup array. 1977af31f5e5SChris Mason * this will bump the backup pointer by one when it is 1978af31f5e5SChris Mason * done 1979af31f5e5SChris Mason */ 1980af31f5e5SChris Mason static void backup_super_roots(struct btrfs_fs_info *info) 1981af31f5e5SChris Mason { 1982af31f5e5SChris Mason int next_backup; 1983af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 1984af31f5e5SChris Mason int last_backup; 1985af31f5e5SChris Mason 1986af31f5e5SChris Mason next_backup = info->backup_root_index; 1987af31f5e5SChris Mason last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) % 1988af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 1989af31f5e5SChris Mason 1990af31f5e5SChris Mason /* 1991af31f5e5SChris Mason * just overwrite the last backup if we're at the same generation 1992af31f5e5SChris Mason * this happens only at umount 1993af31f5e5SChris Mason */ 1994af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + last_backup; 1995af31f5e5SChris Mason if (btrfs_backup_tree_root_gen(root_backup) == 1996af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)) 1997af31f5e5SChris Mason next_backup = last_backup; 1998af31f5e5SChris Mason 1999af31f5e5SChris Mason root_backup = info->super_for_commit->super_roots + next_backup; 2000af31f5e5SChris Mason 2001af31f5e5SChris Mason /* 2002af31f5e5SChris Mason * make sure all of our padding and empty slots get zero filled 2003af31f5e5SChris Mason * regardless of which ones we use today 2004af31f5e5SChris Mason */ 2005af31f5e5SChris Mason memset(root_backup, 0, sizeof(*root_backup)); 2006af31f5e5SChris Mason 2007af31f5e5SChris Mason info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS; 2008af31f5e5SChris Mason 2009af31f5e5SChris Mason btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start); 2010af31f5e5SChris Mason btrfs_set_backup_tree_root_gen(root_backup, 2011af31f5e5SChris Mason btrfs_header_generation(info->tree_root->node)); 2012af31f5e5SChris Mason 2013af31f5e5SChris Mason btrfs_set_backup_tree_root_level(root_backup, 2014af31f5e5SChris Mason btrfs_header_level(info->tree_root->node)); 2015af31f5e5SChris Mason 2016af31f5e5SChris Mason btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start); 2017af31f5e5SChris Mason btrfs_set_backup_chunk_root_gen(root_backup, 2018af31f5e5SChris Mason btrfs_header_generation(info->chunk_root->node)); 2019af31f5e5SChris Mason btrfs_set_backup_chunk_root_level(root_backup, 2020af31f5e5SChris Mason btrfs_header_level(info->chunk_root->node)); 2021af31f5e5SChris Mason 2022af31f5e5SChris Mason btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start); 2023af31f5e5SChris Mason btrfs_set_backup_extent_root_gen(root_backup, 2024af31f5e5SChris Mason btrfs_header_generation(info->extent_root->node)); 2025af31f5e5SChris Mason btrfs_set_backup_extent_root_level(root_backup, 2026af31f5e5SChris Mason btrfs_header_level(info->extent_root->node)); 2027af31f5e5SChris Mason 20287c7e82a7SChris Mason /* 20297c7e82a7SChris Mason * we might commit during log recovery, which happens before we set 20307c7e82a7SChris Mason * the fs_root. Make sure it is valid before we fill it in. 20317c7e82a7SChris Mason */ 20327c7e82a7SChris Mason if (info->fs_root && info->fs_root->node) { 20337c7e82a7SChris Mason btrfs_set_backup_fs_root(root_backup, 20347c7e82a7SChris Mason info->fs_root->node->start); 2035af31f5e5SChris Mason btrfs_set_backup_fs_root_gen(root_backup, 2036af31f5e5SChris Mason btrfs_header_generation(info->fs_root->node)); 2037af31f5e5SChris Mason btrfs_set_backup_fs_root_level(root_backup, 2038af31f5e5SChris Mason btrfs_header_level(info->fs_root->node)); 20397c7e82a7SChris Mason } 2040af31f5e5SChris Mason 2041af31f5e5SChris Mason btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start); 2042af31f5e5SChris Mason btrfs_set_backup_dev_root_gen(root_backup, 2043af31f5e5SChris Mason btrfs_header_generation(info->dev_root->node)); 2044af31f5e5SChris Mason btrfs_set_backup_dev_root_level(root_backup, 2045af31f5e5SChris Mason btrfs_header_level(info->dev_root->node)); 2046af31f5e5SChris Mason 2047af31f5e5SChris Mason btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start); 2048af31f5e5SChris Mason btrfs_set_backup_csum_root_gen(root_backup, 2049af31f5e5SChris Mason btrfs_header_generation(info->csum_root->node)); 2050af31f5e5SChris Mason btrfs_set_backup_csum_root_level(root_backup, 2051af31f5e5SChris Mason btrfs_header_level(info->csum_root->node)); 2052af31f5e5SChris Mason 2053af31f5e5SChris Mason btrfs_set_backup_total_bytes(root_backup, 2054af31f5e5SChris Mason btrfs_super_total_bytes(info->super_copy)); 2055af31f5e5SChris Mason btrfs_set_backup_bytes_used(root_backup, 2056af31f5e5SChris Mason btrfs_super_bytes_used(info->super_copy)); 2057af31f5e5SChris Mason btrfs_set_backup_num_devices(root_backup, 2058af31f5e5SChris Mason btrfs_super_num_devices(info->super_copy)); 2059af31f5e5SChris Mason 2060af31f5e5SChris Mason /* 2061af31f5e5SChris Mason * if we don't copy this out to the super_copy, it won't get remembered 2062af31f5e5SChris Mason * for the next commit 2063af31f5e5SChris Mason */ 2064af31f5e5SChris Mason memcpy(&info->super_copy->super_roots, 2065af31f5e5SChris Mason &info->super_for_commit->super_roots, 2066af31f5e5SChris Mason sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS); 2067af31f5e5SChris Mason } 2068af31f5e5SChris Mason 2069af31f5e5SChris Mason /* 2070af31f5e5SChris Mason * this copies info out of the root backup array and back into 2071af31f5e5SChris Mason * the in-memory super block. It is meant to help iterate through 2072af31f5e5SChris Mason * the array, so you send it the number of backups you've already 2073af31f5e5SChris Mason * tried and the last backup index you used. 2074af31f5e5SChris Mason * 2075af31f5e5SChris Mason * this returns -1 when it has tried all the backups 2076af31f5e5SChris Mason */ 2077af31f5e5SChris Mason static noinline int next_root_backup(struct btrfs_fs_info *info, 2078af31f5e5SChris Mason struct btrfs_super_block *super, 2079af31f5e5SChris Mason int *num_backups_tried, int *backup_index) 2080af31f5e5SChris Mason { 2081af31f5e5SChris Mason struct btrfs_root_backup *root_backup; 2082af31f5e5SChris Mason int newest = *backup_index; 2083af31f5e5SChris Mason 2084af31f5e5SChris Mason if (*num_backups_tried == 0) { 2085af31f5e5SChris Mason u64 gen = btrfs_super_generation(super); 2086af31f5e5SChris Mason 2087af31f5e5SChris Mason newest = find_newest_super_backup(info, gen); 2088af31f5e5SChris Mason if (newest == -1) 2089af31f5e5SChris Mason return -1; 2090af31f5e5SChris Mason 2091af31f5e5SChris Mason *backup_index = newest; 2092af31f5e5SChris Mason *num_backups_tried = 1; 2093af31f5e5SChris Mason } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) { 2094af31f5e5SChris Mason /* we've tried all the backups, all done */ 2095af31f5e5SChris Mason return -1; 2096af31f5e5SChris Mason } else { 2097af31f5e5SChris Mason /* jump to the next oldest backup */ 2098af31f5e5SChris Mason newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) % 2099af31f5e5SChris Mason BTRFS_NUM_BACKUP_ROOTS; 2100af31f5e5SChris Mason *backup_index = newest; 2101af31f5e5SChris Mason *num_backups_tried += 1; 2102af31f5e5SChris Mason } 2103af31f5e5SChris Mason root_backup = super->super_roots + newest; 2104af31f5e5SChris Mason 2105af31f5e5SChris Mason btrfs_set_super_generation(super, 2106af31f5e5SChris Mason btrfs_backup_tree_root_gen(root_backup)); 2107af31f5e5SChris Mason btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup)); 2108af31f5e5SChris Mason btrfs_set_super_root_level(super, 2109af31f5e5SChris Mason btrfs_backup_tree_root_level(root_backup)); 2110af31f5e5SChris Mason btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup)); 2111af31f5e5SChris Mason 2112af31f5e5SChris Mason /* 2113af31f5e5SChris Mason * fixme: the total bytes and num_devices need to match or we should 2114af31f5e5SChris Mason * need a fsck 2115af31f5e5SChris Mason */ 2116af31f5e5SChris Mason btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup)); 2117af31f5e5SChris Mason btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup)); 2118af31f5e5SChris Mason return 0; 2119af31f5e5SChris Mason } 2120af31f5e5SChris Mason 21217abadb64SLiu Bo /* helper to cleanup workers */ 21227abadb64SLiu Bo static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info) 21237abadb64SLiu Bo { 2124dc6e3209SQu Wenruo btrfs_destroy_workqueue(fs_info->fixup_workers); 2125afe3d242SQu Wenruo btrfs_destroy_workqueue(fs_info->delalloc_workers); 21265cdc7ad3SQu Wenruo btrfs_destroy_workqueue(fs_info->workers); 2127fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_workers); 2128fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_meta_workers); 2129fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_raid56_workers); 21308b110e39SMiao Xie btrfs_destroy_workqueue(fs_info->endio_repair_workers); 2131d05a33acSQu Wenruo btrfs_destroy_workqueue(fs_info->rmw_workers); 2132fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_meta_write_workers); 2133fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_write_workers); 2134fccb5d86SQu Wenruo btrfs_destroy_workqueue(fs_info->endio_freespace_worker); 2135a8c93d4eSQu Wenruo btrfs_destroy_workqueue(fs_info->submit_workers); 21365b3bc44eSQu Wenruo btrfs_destroy_workqueue(fs_info->delayed_workers); 2137e66f0bb1SQu Wenruo btrfs_destroy_workqueue(fs_info->caching_workers); 2138736cfa15SQu Wenruo btrfs_destroy_workqueue(fs_info->readahead_workers); 2139a44903abSQu Wenruo btrfs_destroy_workqueue(fs_info->flush_workers); 2140fc97fab0SQu Wenruo btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers); 2141a79b7d4bSChris Mason btrfs_destroy_workqueue(fs_info->extent_workers); 21427abadb64SLiu Bo } 21437abadb64SLiu Bo 21442e9f5954SRashika static void free_root_extent_buffers(struct btrfs_root *root) 21452e9f5954SRashika { 21462e9f5954SRashika if (root) { 21472e9f5954SRashika free_extent_buffer(root->node); 21482e9f5954SRashika free_extent_buffer(root->commit_root); 21492e9f5954SRashika root->node = NULL; 21502e9f5954SRashika root->commit_root = NULL; 21512e9f5954SRashika } 21522e9f5954SRashika } 21532e9f5954SRashika 2154af31f5e5SChris Mason /* helper to cleanup tree roots */ 2155af31f5e5SChris Mason static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root) 2156af31f5e5SChris Mason { 21572e9f5954SRashika free_root_extent_buffers(info->tree_root); 2158655b09feSJosef Bacik 21592e9f5954SRashika free_root_extent_buffers(info->dev_root); 21602e9f5954SRashika free_root_extent_buffers(info->extent_root); 21612e9f5954SRashika free_root_extent_buffers(info->csum_root); 21622e9f5954SRashika free_root_extent_buffers(info->quota_root); 21632e9f5954SRashika free_root_extent_buffers(info->uuid_root); 21642e9f5954SRashika if (chunk_root) 21652e9f5954SRashika free_root_extent_buffers(info->chunk_root); 2166af31f5e5SChris Mason } 2167af31f5e5SChris Mason 2168faa2dbf0SJosef Bacik void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info) 2169171f6537SJosef Bacik { 2170171f6537SJosef Bacik int ret; 2171171f6537SJosef Bacik struct btrfs_root *gang[8]; 2172171f6537SJosef Bacik int i; 2173171f6537SJosef Bacik 2174171f6537SJosef Bacik while (!list_empty(&fs_info->dead_roots)) { 2175171f6537SJosef Bacik gang[0] = list_entry(fs_info->dead_roots.next, 2176171f6537SJosef Bacik struct btrfs_root, root_list); 2177171f6537SJosef Bacik list_del(&gang[0]->root_list); 2178171f6537SJosef Bacik 217927cdeb70SMiao Xie if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) { 2180cb517eabSMiao Xie btrfs_drop_and_free_fs_root(fs_info, gang[0]); 2181171f6537SJosef Bacik } else { 2182171f6537SJosef Bacik free_extent_buffer(gang[0]->node); 2183171f6537SJosef Bacik free_extent_buffer(gang[0]->commit_root); 2184b0feb9d9SMiao Xie btrfs_put_fs_root(gang[0]); 2185171f6537SJosef Bacik } 2186171f6537SJosef Bacik } 2187171f6537SJosef Bacik 2188171f6537SJosef Bacik while (1) { 2189171f6537SJosef Bacik ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 2190171f6537SJosef Bacik (void **)gang, 0, 2191171f6537SJosef Bacik ARRAY_SIZE(gang)); 2192171f6537SJosef Bacik if (!ret) 2193171f6537SJosef Bacik break; 2194171f6537SJosef Bacik for (i = 0; i < ret; i++) 2195cb517eabSMiao Xie btrfs_drop_and_free_fs_root(fs_info, gang[i]); 2196171f6537SJosef Bacik } 21971a4319ccSLiu Bo 21981a4319ccSLiu Bo if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 21991a4319ccSLiu Bo btrfs_free_log_root_tree(NULL, fs_info); 22001a4319ccSLiu Bo btrfs_destroy_pinned_extent(fs_info->tree_root, 22011a4319ccSLiu Bo fs_info->pinned_extents); 22021a4319ccSLiu Bo } 2203171f6537SJosef Bacik } 2204af31f5e5SChris Mason 2205638aa7edSEric Sandeen static void btrfs_init_scrub(struct btrfs_fs_info *fs_info) 2206638aa7edSEric Sandeen { 2207638aa7edSEric Sandeen mutex_init(&fs_info->scrub_lock); 2208638aa7edSEric Sandeen atomic_set(&fs_info->scrubs_running, 0); 2209638aa7edSEric Sandeen atomic_set(&fs_info->scrub_pause_req, 0); 2210638aa7edSEric Sandeen atomic_set(&fs_info->scrubs_paused, 0); 2211638aa7edSEric Sandeen atomic_set(&fs_info->scrub_cancel_req, 0); 2212638aa7edSEric Sandeen init_waitqueue_head(&fs_info->scrub_pause_wait); 2213638aa7edSEric Sandeen fs_info->scrub_workers_refcnt = 0; 2214638aa7edSEric Sandeen } 2215638aa7edSEric Sandeen 2216779a65a4SEric Sandeen static void btrfs_init_balance(struct btrfs_fs_info *fs_info) 2217779a65a4SEric Sandeen { 2218779a65a4SEric Sandeen spin_lock_init(&fs_info->balance_lock); 2219779a65a4SEric Sandeen mutex_init(&fs_info->balance_mutex); 2220779a65a4SEric Sandeen atomic_set(&fs_info->balance_running, 0); 2221779a65a4SEric Sandeen atomic_set(&fs_info->balance_pause_req, 0); 2222779a65a4SEric Sandeen atomic_set(&fs_info->balance_cancel_req, 0); 2223779a65a4SEric Sandeen fs_info->balance_ctl = NULL; 2224779a65a4SEric Sandeen init_waitqueue_head(&fs_info->balance_wait_q); 2225779a65a4SEric Sandeen } 2226779a65a4SEric Sandeen 2227f37938e0SEric Sandeen static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info, 2228f37938e0SEric Sandeen struct btrfs_root *tree_root) 2229f37938e0SEric Sandeen { 2230f37938e0SEric Sandeen fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; 2231f37938e0SEric Sandeen set_nlink(fs_info->btree_inode, 1); 2232f37938e0SEric Sandeen /* 2233f37938e0SEric Sandeen * we set the i_size on the btree inode to the max possible int. 2234f37938e0SEric Sandeen * the real end of the address space is determined by all of 2235f37938e0SEric Sandeen * the devices in the system 2236f37938e0SEric Sandeen */ 2237f37938e0SEric Sandeen fs_info->btree_inode->i_size = OFFSET_MAX; 2238f37938e0SEric Sandeen fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 2239f37938e0SEric Sandeen 2240f37938e0SEric Sandeen RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); 2241f37938e0SEric Sandeen extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 2242f37938e0SEric Sandeen fs_info->btree_inode->i_mapping); 2243f37938e0SEric Sandeen BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0; 2244f37938e0SEric Sandeen extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree); 2245f37938e0SEric Sandeen 2246f37938e0SEric Sandeen BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 2247f37938e0SEric Sandeen 2248f37938e0SEric Sandeen BTRFS_I(fs_info->btree_inode)->root = tree_root; 2249f37938e0SEric Sandeen memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 2250f37938e0SEric Sandeen sizeof(struct btrfs_key)); 2251f37938e0SEric Sandeen set_bit(BTRFS_INODE_DUMMY, 2252f37938e0SEric Sandeen &BTRFS_I(fs_info->btree_inode)->runtime_flags); 2253f37938e0SEric Sandeen btrfs_insert_inode_hash(fs_info->btree_inode); 2254f37938e0SEric Sandeen } 2255f37938e0SEric Sandeen 2256ad618368SEric Sandeen static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info) 2257ad618368SEric Sandeen { 2258ad618368SEric Sandeen fs_info->dev_replace.lock_owner = 0; 2259ad618368SEric Sandeen atomic_set(&fs_info->dev_replace.nesting_level, 0); 2260ad618368SEric Sandeen mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount); 2261ad618368SEric Sandeen mutex_init(&fs_info->dev_replace.lock_management_lock); 2262ad618368SEric Sandeen mutex_init(&fs_info->dev_replace.lock); 2263ad618368SEric Sandeen init_waitqueue_head(&fs_info->replace_wait); 2264ad618368SEric Sandeen } 2265ad618368SEric Sandeen 2266f9e92e40SEric Sandeen static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info) 2267f9e92e40SEric Sandeen { 2268f9e92e40SEric Sandeen spin_lock_init(&fs_info->qgroup_lock); 2269f9e92e40SEric Sandeen mutex_init(&fs_info->qgroup_ioctl_lock); 2270f9e92e40SEric Sandeen fs_info->qgroup_tree = RB_ROOT; 2271f9e92e40SEric Sandeen fs_info->qgroup_op_tree = RB_ROOT; 2272f9e92e40SEric Sandeen INIT_LIST_HEAD(&fs_info->dirty_qgroups); 2273f9e92e40SEric Sandeen fs_info->qgroup_seq = 1; 2274f9e92e40SEric Sandeen fs_info->quota_enabled = 0; 2275f9e92e40SEric Sandeen fs_info->pending_quota_state = 0; 2276f9e92e40SEric Sandeen fs_info->qgroup_ulist = NULL; 2277f9e92e40SEric Sandeen mutex_init(&fs_info->qgroup_rescan_lock); 2278f9e92e40SEric Sandeen } 2279f9e92e40SEric Sandeen 22802a458198SEric Sandeen static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info, 22812a458198SEric Sandeen struct btrfs_fs_devices *fs_devices) 22822a458198SEric Sandeen { 22832a458198SEric Sandeen int max_active = fs_info->thread_pool_size; 22846f011058SDavid Sterba unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND; 22852a458198SEric Sandeen 22862a458198SEric Sandeen fs_info->workers = 22872a458198SEric Sandeen btrfs_alloc_workqueue("worker", flags | WQ_HIGHPRI, 22882a458198SEric Sandeen max_active, 16); 22892a458198SEric Sandeen 22902a458198SEric Sandeen fs_info->delalloc_workers = 22912a458198SEric Sandeen btrfs_alloc_workqueue("delalloc", flags, max_active, 2); 22922a458198SEric Sandeen 22932a458198SEric Sandeen fs_info->flush_workers = 22942a458198SEric Sandeen btrfs_alloc_workqueue("flush_delalloc", flags, max_active, 0); 22952a458198SEric Sandeen 22962a458198SEric Sandeen fs_info->caching_workers = 22972a458198SEric Sandeen btrfs_alloc_workqueue("cache", flags, max_active, 0); 22982a458198SEric Sandeen 22992a458198SEric Sandeen /* 23002a458198SEric Sandeen * a higher idle thresh on the submit workers makes it much more 23012a458198SEric Sandeen * likely that bios will be send down in a sane order to the 23022a458198SEric Sandeen * devices 23032a458198SEric Sandeen */ 23042a458198SEric Sandeen fs_info->submit_workers = 23052a458198SEric Sandeen btrfs_alloc_workqueue("submit", flags, 23062a458198SEric Sandeen min_t(u64, fs_devices->num_devices, 23072a458198SEric Sandeen max_active), 64); 23082a458198SEric Sandeen 23092a458198SEric Sandeen fs_info->fixup_workers = 23102a458198SEric Sandeen btrfs_alloc_workqueue("fixup", flags, 1, 0); 23112a458198SEric Sandeen 23122a458198SEric Sandeen /* 23132a458198SEric Sandeen * endios are largely parallel and should have a very 23142a458198SEric Sandeen * low idle thresh 23152a458198SEric Sandeen */ 23162a458198SEric Sandeen fs_info->endio_workers = 23172a458198SEric Sandeen btrfs_alloc_workqueue("endio", flags, max_active, 4); 23182a458198SEric Sandeen fs_info->endio_meta_workers = 23192a458198SEric Sandeen btrfs_alloc_workqueue("endio-meta", flags, max_active, 4); 23202a458198SEric Sandeen fs_info->endio_meta_write_workers = 23212a458198SEric Sandeen btrfs_alloc_workqueue("endio-meta-write", flags, max_active, 2); 23222a458198SEric Sandeen fs_info->endio_raid56_workers = 23232a458198SEric Sandeen btrfs_alloc_workqueue("endio-raid56", flags, max_active, 4); 23242a458198SEric Sandeen fs_info->endio_repair_workers = 23252a458198SEric Sandeen btrfs_alloc_workqueue("endio-repair", flags, 1, 0); 23262a458198SEric Sandeen fs_info->rmw_workers = 23272a458198SEric Sandeen btrfs_alloc_workqueue("rmw", flags, max_active, 2); 23282a458198SEric Sandeen fs_info->endio_write_workers = 23292a458198SEric Sandeen btrfs_alloc_workqueue("endio-write", flags, max_active, 2); 23302a458198SEric Sandeen fs_info->endio_freespace_worker = 23312a458198SEric Sandeen btrfs_alloc_workqueue("freespace-write", flags, max_active, 0); 23322a458198SEric Sandeen fs_info->delayed_workers = 23332a458198SEric Sandeen btrfs_alloc_workqueue("delayed-meta", flags, max_active, 0); 23342a458198SEric Sandeen fs_info->readahead_workers = 23352a458198SEric Sandeen btrfs_alloc_workqueue("readahead", flags, max_active, 2); 23362a458198SEric Sandeen fs_info->qgroup_rescan_workers = 23372a458198SEric Sandeen btrfs_alloc_workqueue("qgroup-rescan", flags, 1, 0); 23382a458198SEric Sandeen fs_info->extent_workers = 23392a458198SEric Sandeen btrfs_alloc_workqueue("extent-refs", flags, 23402a458198SEric Sandeen min_t(u64, fs_devices->num_devices, 23412a458198SEric Sandeen max_active), 8); 23422a458198SEric Sandeen 23432a458198SEric Sandeen if (!(fs_info->workers && fs_info->delalloc_workers && 23442a458198SEric Sandeen fs_info->submit_workers && fs_info->flush_workers && 23452a458198SEric Sandeen fs_info->endio_workers && fs_info->endio_meta_workers && 23462a458198SEric Sandeen fs_info->endio_meta_write_workers && 23472a458198SEric Sandeen fs_info->endio_repair_workers && 23482a458198SEric Sandeen fs_info->endio_write_workers && fs_info->endio_raid56_workers && 23492a458198SEric Sandeen fs_info->endio_freespace_worker && fs_info->rmw_workers && 23502a458198SEric Sandeen fs_info->caching_workers && fs_info->readahead_workers && 23512a458198SEric Sandeen fs_info->fixup_workers && fs_info->delayed_workers && 23522a458198SEric Sandeen fs_info->extent_workers && 23532a458198SEric Sandeen fs_info->qgroup_rescan_workers)) { 23542a458198SEric Sandeen return -ENOMEM; 23552a458198SEric Sandeen } 23562a458198SEric Sandeen 23572a458198SEric Sandeen return 0; 23582a458198SEric Sandeen } 23592a458198SEric Sandeen 236063443bf5SEric Sandeen static int btrfs_replay_log(struct btrfs_fs_info *fs_info, 236163443bf5SEric Sandeen struct btrfs_fs_devices *fs_devices) 236263443bf5SEric Sandeen { 236363443bf5SEric Sandeen int ret; 236463443bf5SEric Sandeen struct btrfs_root *tree_root = fs_info->tree_root; 236563443bf5SEric Sandeen struct btrfs_root *log_tree_root; 236663443bf5SEric Sandeen struct btrfs_super_block *disk_super = fs_info->super_copy; 236763443bf5SEric Sandeen u64 bytenr = btrfs_super_log_root(disk_super); 236863443bf5SEric Sandeen 236963443bf5SEric Sandeen if (fs_devices->rw_devices == 0) { 2370f14d104dSDavid Sterba btrfs_warn(fs_info, "log replay required on RO media"); 237163443bf5SEric Sandeen return -EIO; 237263443bf5SEric Sandeen } 237363443bf5SEric Sandeen 237463443bf5SEric Sandeen log_tree_root = btrfs_alloc_root(fs_info); 237563443bf5SEric Sandeen if (!log_tree_root) 237663443bf5SEric Sandeen return -ENOMEM; 237763443bf5SEric Sandeen 237863443bf5SEric Sandeen __setup_root(tree_root->nodesize, tree_root->sectorsize, 237963443bf5SEric Sandeen tree_root->stripesize, log_tree_root, fs_info, 238063443bf5SEric Sandeen BTRFS_TREE_LOG_OBJECTID); 238163443bf5SEric Sandeen 238263443bf5SEric Sandeen log_tree_root->node = read_tree_block(tree_root, bytenr, 238363443bf5SEric Sandeen fs_info->generation + 1); 238464c043deSLiu Bo if (IS_ERR(log_tree_root->node)) { 2385f14d104dSDavid Sterba btrfs_warn(fs_info, "failed to read log tree"); 23860eeff236SLiu Bo ret = PTR_ERR(log_tree_root->node); 238764c043deSLiu Bo kfree(log_tree_root); 23880eeff236SLiu Bo return ret; 238964c043deSLiu Bo } else if (!extent_buffer_uptodate(log_tree_root->node)) { 2390f14d104dSDavid Sterba btrfs_err(fs_info, "failed to read log tree"); 239163443bf5SEric Sandeen free_extent_buffer(log_tree_root->node); 239263443bf5SEric Sandeen kfree(log_tree_root); 239363443bf5SEric Sandeen return -EIO; 239463443bf5SEric Sandeen } 239563443bf5SEric Sandeen /* returns with log_tree_root freed on success */ 239663443bf5SEric Sandeen ret = btrfs_recover_log_trees(log_tree_root); 239763443bf5SEric Sandeen if (ret) { 2398a4553fefSAnand Jain btrfs_std_error(tree_root->fs_info, ret, 239963443bf5SEric Sandeen "Failed to recover log tree"); 240063443bf5SEric Sandeen free_extent_buffer(log_tree_root->node); 240163443bf5SEric Sandeen kfree(log_tree_root); 240263443bf5SEric Sandeen return ret; 240363443bf5SEric Sandeen } 240463443bf5SEric Sandeen 240563443bf5SEric Sandeen if (fs_info->sb->s_flags & MS_RDONLY) { 240663443bf5SEric Sandeen ret = btrfs_commit_super(tree_root); 240763443bf5SEric Sandeen if (ret) 240863443bf5SEric Sandeen return ret; 240963443bf5SEric Sandeen } 241063443bf5SEric Sandeen 241163443bf5SEric Sandeen return 0; 241263443bf5SEric Sandeen } 241363443bf5SEric Sandeen 24144bbcaa64SEric Sandeen static int btrfs_read_roots(struct btrfs_fs_info *fs_info, 24154bbcaa64SEric Sandeen struct btrfs_root *tree_root) 24164bbcaa64SEric Sandeen { 2417a4f3d2c4SDavid Sterba struct btrfs_root *root; 24184bbcaa64SEric Sandeen struct btrfs_key location; 24194bbcaa64SEric Sandeen int ret; 24204bbcaa64SEric Sandeen 24214bbcaa64SEric Sandeen location.objectid = BTRFS_EXTENT_TREE_OBJECTID; 24224bbcaa64SEric Sandeen location.type = BTRFS_ROOT_ITEM_KEY; 24234bbcaa64SEric Sandeen location.offset = 0; 24244bbcaa64SEric Sandeen 2425a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2426a4f3d2c4SDavid Sterba if (IS_ERR(root)) 2427a4f3d2c4SDavid Sterba return PTR_ERR(root); 2428a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 2429a4f3d2c4SDavid Sterba fs_info->extent_root = root; 24304bbcaa64SEric Sandeen 24314bbcaa64SEric Sandeen location.objectid = BTRFS_DEV_TREE_OBJECTID; 2432a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2433a4f3d2c4SDavid Sterba if (IS_ERR(root)) 2434a4f3d2c4SDavid Sterba return PTR_ERR(root); 2435a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 2436a4f3d2c4SDavid Sterba fs_info->dev_root = root; 24374bbcaa64SEric Sandeen btrfs_init_devices_late(fs_info); 24384bbcaa64SEric Sandeen 24394bbcaa64SEric Sandeen location.objectid = BTRFS_CSUM_TREE_OBJECTID; 2440a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2441a4f3d2c4SDavid Sterba if (IS_ERR(root)) 2442a4f3d2c4SDavid Sterba return PTR_ERR(root); 2443a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 2444a4f3d2c4SDavid Sterba fs_info->csum_root = root; 24454bbcaa64SEric Sandeen 24464bbcaa64SEric Sandeen location.objectid = BTRFS_QUOTA_TREE_OBJECTID; 2447a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2448a4f3d2c4SDavid Sterba if (!IS_ERR(root)) { 2449a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 24504bbcaa64SEric Sandeen fs_info->quota_enabled = 1; 24514bbcaa64SEric Sandeen fs_info->pending_quota_state = 1; 2452a4f3d2c4SDavid Sterba fs_info->quota_root = root; 24534bbcaa64SEric Sandeen } 24544bbcaa64SEric Sandeen 24554bbcaa64SEric Sandeen location.objectid = BTRFS_UUID_TREE_OBJECTID; 2456a4f3d2c4SDavid Sterba root = btrfs_read_tree_root(tree_root, &location); 2457a4f3d2c4SDavid Sterba if (IS_ERR(root)) { 2458a4f3d2c4SDavid Sterba ret = PTR_ERR(root); 24594bbcaa64SEric Sandeen if (ret != -ENOENT) 24604bbcaa64SEric Sandeen return ret; 24614bbcaa64SEric Sandeen } else { 2462a4f3d2c4SDavid Sterba set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); 2463a4f3d2c4SDavid Sterba fs_info->uuid_root = root; 24644bbcaa64SEric Sandeen } 24654bbcaa64SEric Sandeen 24664bbcaa64SEric Sandeen return 0; 24674bbcaa64SEric Sandeen } 24684bbcaa64SEric Sandeen 2469ad2b2c80SAl Viro int open_ctree(struct super_block *sb, 2470dfe25020SChris Mason struct btrfs_fs_devices *fs_devices, 2471dfe25020SChris Mason char *options) 2472eb60ceacSChris Mason { 2473db94535dSChris Mason u32 sectorsize; 2474db94535dSChris Mason u32 nodesize; 247587ee04ebSChris Mason u32 stripesize; 247684234f3aSYan Zheng u64 generation; 2477f2b636e8SJosef Bacik u64 features; 24783de4586cSChris Mason struct btrfs_key location; 2479a061fc8dSChris Mason struct buffer_head *bh; 24804d34b278SIlya Dryomov struct btrfs_super_block *disk_super; 2481815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2482f84a8bd6SAl Viro struct btrfs_root *tree_root; 24834d34b278SIlya Dryomov struct btrfs_root *chunk_root; 2484eb60ceacSChris Mason int ret; 2485e58ca020SYan int err = -EINVAL; 2486af31f5e5SChris Mason int num_backups_tried = 0; 2487af31f5e5SChris Mason int backup_index = 0; 24885cdc7ad3SQu Wenruo int max_active; 24894543df7eSChris Mason 2490f84a8bd6SAl Viro tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info); 24916f07e42eSAl Viro chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info); 2492cb517eabSMiao Xie if (!tree_root || !chunk_root) { 249339279cc3SChris Mason err = -ENOMEM; 249439279cc3SChris Mason goto fail; 249539279cc3SChris Mason } 249676dda93cSYan, Zheng 249776dda93cSYan, Zheng ret = init_srcu_struct(&fs_info->subvol_srcu); 249876dda93cSYan, Zheng if (ret) { 249976dda93cSYan, Zheng err = ret; 250076dda93cSYan, Zheng goto fail; 250176dda93cSYan, Zheng } 250276dda93cSYan, Zheng 250376dda93cSYan, Zheng ret = setup_bdi(fs_info, &fs_info->bdi); 250476dda93cSYan, Zheng if (ret) { 250576dda93cSYan, Zheng err = ret; 250676dda93cSYan, Zheng goto fail_srcu; 250776dda93cSYan, Zheng } 250876dda93cSYan, Zheng 2509908c7f19STejun Heo ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL); 2510e2d84521SMiao Xie if (ret) { 2511e2d84521SMiao Xie err = ret; 2512e2d84521SMiao Xie goto fail_bdi; 2513e2d84521SMiao Xie } 2514e2d84521SMiao Xie fs_info->dirty_metadata_batch = PAGE_CACHE_SIZE * 2515e2d84521SMiao Xie (1 + ilog2(nr_cpu_ids)); 2516e2d84521SMiao Xie 2517908c7f19STejun Heo ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL); 2518963d678bSMiao Xie if (ret) { 2519963d678bSMiao Xie err = ret; 2520963d678bSMiao Xie goto fail_dirty_metadata_bytes; 2521963d678bSMiao Xie } 2522963d678bSMiao Xie 2523908c7f19STejun Heo ret = percpu_counter_init(&fs_info->bio_counter, 0, GFP_KERNEL); 2524c404e0dcSMiao Xie if (ret) { 2525c404e0dcSMiao Xie err = ret; 2526c404e0dcSMiao Xie goto fail_delalloc_bytes; 2527c404e0dcSMiao Xie } 2528c404e0dcSMiao Xie 252976dda93cSYan, Zheng fs_info->btree_inode = new_inode(sb); 253076dda93cSYan, Zheng if (!fs_info->btree_inode) { 253176dda93cSYan, Zheng err = -ENOMEM; 2532c404e0dcSMiao Xie goto fail_bio_counter; 253376dda93cSYan, Zheng } 253476dda93cSYan, Zheng 2535a6591715SChris Mason mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); 25361561dedaSMiao Xie 253776dda93cSYan, Zheng INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); 2538f28491e0SJosef Bacik INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC); 25398fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 2540facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 254124bbcf04SYan, Zheng INIT_LIST_HEAD(&fs_info->delayed_iputs); 2542eb73c1b7SMiao Xie INIT_LIST_HEAD(&fs_info->delalloc_roots); 254311833d66SYan Zheng INIT_LIST_HEAD(&fs_info->caching_block_groups); 2544eb73c1b7SMiao Xie spin_lock_init(&fs_info->delalloc_root_lock); 2545a4abeea4SJosef Bacik spin_lock_init(&fs_info->trans_lock); 254676dda93cSYan, Zheng spin_lock_init(&fs_info->fs_roots_radix_lock); 254724bbcf04SYan, Zheng spin_lock_init(&fs_info->delayed_iput_lock); 25484cb5300bSChris Mason spin_lock_init(&fs_info->defrag_inodes_lock); 25492bf64758SJosef Bacik spin_lock_init(&fs_info->free_chunk_lock); 2550f29021b2SJan Schmidt spin_lock_init(&fs_info->tree_mod_seq_lock); 2551ceda0864SMiao Xie spin_lock_init(&fs_info->super_lock); 2552fcebe456SJosef Bacik spin_lock_init(&fs_info->qgroup_op_lock); 2553f28491e0SJosef Bacik spin_lock_init(&fs_info->buffer_lock); 255447ab2a6cSJosef Bacik spin_lock_init(&fs_info->unused_bgs_lock); 2555f29021b2SJan Schmidt rwlock_init(&fs_info->tree_mod_log_lock); 2556d7c15171SZhao Lei mutex_init(&fs_info->unused_bg_unpin_mutex); 255767c5e7d4SFilipe Manana mutex_init(&fs_info->delete_unused_bgs_mutex); 25587585717fSChris Mason mutex_init(&fs_info->reloc_mutex); 2559573bfb72SMiao Xie mutex_init(&fs_info->delalloc_root_mutex); 2560de98ced9SMiao Xie seqlock_init(&fs_info->profiles_lock); 2561d7c15171SZhao Lei init_rwsem(&fs_info->delayed_iput_sem); 256219c00ddcSChris Mason 25630b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 25646324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 2565f29021b2SJan Schmidt INIT_LIST_HEAD(&fs_info->tree_mod_seq_list); 256647ab2a6cSJosef Bacik INIT_LIST_HEAD(&fs_info->unused_bgs); 25670b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 256866d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->global_block_rsv, 256966d8f3ddSMiao Xie BTRFS_BLOCK_RSV_GLOBAL); 257066d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->delalloc_block_rsv, 257166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_DELALLOC); 257266d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS); 257366d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK); 257466d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY); 257566d8f3ddSMiao Xie btrfs_init_block_rsv(&fs_info->delayed_block_rsv, 257666d8f3ddSMiao Xie BTRFS_BLOCK_RSV_DELOPS); 2577cb03c743SChris Mason atomic_set(&fs_info->nr_async_submits, 0); 2578771ed689SChris Mason atomic_set(&fs_info->async_delalloc_pages, 0); 25798c8bee1dSChris Mason atomic_set(&fs_info->async_submit_draining, 0); 25800986fe9eSChris Mason atomic_set(&fs_info->nr_async_bios, 0); 25814cb5300bSChris Mason atomic_set(&fs_info->defrag_running, 0); 2582fcebe456SJosef Bacik atomic_set(&fs_info->qgroup_op_seq, 0); 2583fc36ed7eSJan Schmidt atomic64_set(&fs_info->tree_mod_seq, 0); 2584e20d96d6SChris Mason fs_info->sb = sb; 258595ac567aSFilipe David Borba Manana fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE; 25869ed74f2dSJosef Bacik fs_info->metadata_ratio = 0; 25874cb5300bSChris Mason fs_info->defrag_inodes = RB_ROOT; 25882bf64758SJosef Bacik fs_info->free_chunk_space = 0; 2589f29021b2SJan Schmidt fs_info->tree_mod_log = RB_ROOT; 25908b87dc17SDavid Sterba fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; 2591f8c269d7SDavid Sterba fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */ 259290519d66SArne Jansen /* readahead state */ 2593d0164adcSMel Gorman INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM); 259490519d66SArne Jansen spin_lock_init(&fs_info->reada_lock); 2595c8b97818SChris Mason 2596b34b086cSChris Mason fs_info->thread_pool_size = min_t(unsigned long, 2597b34b086cSChris Mason num_online_cpus() + 2, 8); 25980afbaf8cSChris Mason 2599199c2a9cSMiao Xie INIT_LIST_HEAD(&fs_info->ordered_roots); 2600199c2a9cSMiao Xie spin_lock_init(&fs_info->ordered_root_lock); 260116cdcec7SMiao Xie fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), 260216cdcec7SMiao Xie GFP_NOFS); 260316cdcec7SMiao Xie if (!fs_info->delayed_root) { 260416cdcec7SMiao Xie err = -ENOMEM; 260516cdcec7SMiao Xie goto fail_iput; 260616cdcec7SMiao Xie } 260716cdcec7SMiao Xie btrfs_init_delayed_root(fs_info->delayed_root); 26083eaa2885SChris Mason 2609638aa7edSEric Sandeen btrfs_init_scrub(fs_info); 261021adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 261121adbd5cSStefan Behrens fs_info->check_integrity_print_mask = 0; 261221adbd5cSStefan Behrens #endif 2613779a65a4SEric Sandeen btrfs_init_balance(fs_info); 261421c7e756SMiao Xie btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work); 2615a2de733cSArne Jansen 2616a061fc8dSChris Mason sb->s_blocksize = 4096; 2617a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 261832a88aa1SJens Axboe sb->s_bdi = &fs_info->bdi; 2619a061fc8dSChris Mason 2620f37938e0SEric Sandeen btrfs_init_btree_inode(fs_info, tree_root); 262139279cc3SChris Mason 2622e02119d5SChris Mason spin_lock_init(&fs_info->block_group_cache_lock); 26236bef4d31SEric Paris fs_info->block_group_cache_tree = RB_ROOT; 2624a1897fddSLiu Bo fs_info->first_logical_byte = (u64)-1; 2625925baeddSChris Mason 262611833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[0], 2627f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 262811833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[1], 2629f993c883SDavid Sterba fs_info->btree_inode->i_mapping); 263011833d66SYan Zheng fs_info->pinned_extents = &fs_info->freed_extents[0]; 2631e6dcd2dcSChris Mason fs_info->do_barriers = 1; 2632f9295749SChris Mason 2633d98237b3SChris Mason 26345a3f23d5SChris Mason mutex_init(&fs_info->ordered_operations_mutex); 263530ae8467SChris Mason mutex_init(&fs_info->tree_log_mutex); 2636925baeddSChris Mason mutex_init(&fs_info->chunk_mutex); 2637925baeddSChris Mason mutex_init(&fs_info->transaction_kthread_mutex); 2638a74a4b97SChris Mason mutex_init(&fs_info->cleaner_mutex); 2639a74a4b97SChris Mason mutex_init(&fs_info->volume_mutex); 26401bbc621eSChris Mason mutex_init(&fs_info->ro_block_group_mutex); 26419e351cc8SJosef Bacik init_rwsem(&fs_info->commit_root_sem); 2642c71bf099SYan, Zheng init_rwsem(&fs_info->cleanup_work_sem); 264376dda93cSYan, Zheng init_rwsem(&fs_info->subvol_sem); 2644803b2f54SStefan Behrens sema_init(&fs_info->uuid_tree_rescan_sem, 1); 2645fa9c0d79SChris Mason 2646ad618368SEric Sandeen btrfs_init_dev_replace_locks(fs_info); 2647f9e92e40SEric Sandeen btrfs_init_qgroup(fs_info); 2648416ac51dSArne Jansen 2649fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); 2650fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->data_alloc_cluster); 2651fa9c0d79SChris Mason 26527d9eb12cSChris Mason init_waitqueue_head(&fs_info->transaction_throttle); 26533768f368SChris Mason init_waitqueue_head(&fs_info->transaction_wait); 2654bb9c12c9SSage Weil init_waitqueue_head(&fs_info->transaction_blocked_wait); 26554854ddd0SChris Mason init_waitqueue_head(&fs_info->async_submit_wait); 26569a8dd150SChris Mason 265704216820SFilipe Manana INIT_LIST_HEAD(&fs_info->pinned_chunks); 265804216820SFilipe Manana 265953b381b3SDavid Woodhouse ret = btrfs_alloc_stripe_hash_table(fs_info); 266053b381b3SDavid Woodhouse if (ret) { 266183c8266aSDavid Sterba err = ret; 266253b381b3SDavid Woodhouse goto fail_alloc; 266353b381b3SDavid Woodhouse } 266453b381b3SDavid Woodhouse 2665707e8a07SDavid Sterba __setup_root(4096, 4096, 4096, tree_root, 26662c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 26677eccb903SChris Mason 26683c4bb26bSChris Mason invalidate_bdev(fs_devices->latest_bdev); 26691104a885SDavid Sterba 26701104a885SDavid Sterba /* 26711104a885SDavid Sterba * Read super block and check the signature bytes only 26721104a885SDavid Sterba */ 2673a512bbf8SYan Zheng bh = btrfs_read_dev_super(fs_devices->latest_bdev); 267492fc03fbSAnand Jain if (IS_ERR(bh)) { 267592fc03fbSAnand Jain err = PTR_ERR(bh); 267616cdcec7SMiao Xie goto fail_alloc; 267720b45077SDave Young } 267839279cc3SChris Mason 26791104a885SDavid Sterba /* 26801104a885SDavid Sterba * We want to check superblock checksum, the type is stored inside. 26811104a885SDavid Sterba * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k). 26821104a885SDavid Sterba */ 26831104a885SDavid Sterba if (btrfs_check_super_csum(bh->b_data)) { 2684efe120a0SFrank Holton printk(KERN_ERR "BTRFS: superblock checksum mismatch\n"); 26851104a885SDavid Sterba err = -EINVAL; 2686b2acdddfSAnand Jain brelse(bh); 26871104a885SDavid Sterba goto fail_alloc; 26881104a885SDavid Sterba } 26891104a885SDavid Sterba 26901104a885SDavid Sterba /* 26911104a885SDavid Sterba * super_copy is zeroed at allocation time and we never touch the 26921104a885SDavid Sterba * following bytes up to INFO_SIZE, the checksum is calculated from 26931104a885SDavid Sterba * the whole block of INFO_SIZE 26941104a885SDavid Sterba */ 26956c41761fSDavid Sterba memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy)); 26966c41761fSDavid Sterba memcpy(fs_info->super_for_commit, fs_info->super_copy, 26976c41761fSDavid Sterba sizeof(*fs_info->super_for_commit)); 2698a061fc8dSChris Mason brelse(bh); 26995f39d397SChris Mason 27006c41761fSDavid Sterba memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); 27010b86a832SChris Mason 27021104a885SDavid Sterba ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); 27031104a885SDavid Sterba if (ret) { 2704efe120a0SFrank Holton printk(KERN_ERR "BTRFS: superblock contains fatal errors\n"); 27051104a885SDavid Sterba err = -EINVAL; 27061104a885SDavid Sterba goto fail_alloc; 27071104a885SDavid Sterba } 27081104a885SDavid Sterba 27096c41761fSDavid Sterba disk_super = fs_info->super_copy; 27100f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 271116cdcec7SMiao Xie goto fail_alloc; 27120f7d52f4SChris Mason 2713acce952bSliubo /* check FS state, whether FS is broken. */ 271487533c47SMiao Xie if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR) 271587533c47SMiao Xie set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 2716acce952bSliubo 271775e7cb7fSLiu Bo /* 2718af31f5e5SChris Mason * run through our array of backup supers and setup 2719af31f5e5SChris Mason * our ring pointer to the oldest one 2720af31f5e5SChris Mason */ 2721af31f5e5SChris Mason generation = btrfs_super_generation(disk_super); 2722af31f5e5SChris Mason find_oldest_super_backup(fs_info, generation); 2723af31f5e5SChris Mason 2724af31f5e5SChris Mason /* 272575e7cb7fSLiu Bo * In the long term, we'll store the compression type in the super 272675e7cb7fSLiu Bo * block, and it'll be used for per file compression control. 272775e7cb7fSLiu Bo */ 272875e7cb7fSLiu Bo fs_info->compress_type = BTRFS_COMPRESS_ZLIB; 272975e7cb7fSLiu Bo 27302b82032cSYan Zheng ret = btrfs_parse_options(tree_root, options); 27312b82032cSYan Zheng if (ret) { 27322b82032cSYan Zheng err = ret; 273316cdcec7SMiao Xie goto fail_alloc; 27342b82032cSYan Zheng } 2735dfe25020SChris Mason 2736f2b636e8SJosef Bacik features = btrfs_super_incompat_flags(disk_super) & 2737f2b636e8SJosef Bacik ~BTRFS_FEATURE_INCOMPAT_SUPP; 2738f2b636e8SJosef Bacik if (features) { 2739f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount because of " 2740f2b636e8SJosef Bacik "unsupported optional features (%Lx).\n", 2741c1c9ff7cSGeert Uytterhoeven features); 2742f2b636e8SJosef Bacik err = -EINVAL; 274316cdcec7SMiao Xie goto fail_alloc; 2744f2b636e8SJosef Bacik } 2745f2b636e8SJosef Bacik 2746707e8a07SDavid Sterba /* 2747707e8a07SDavid Sterba * Leafsize and nodesize were always equal, this is only a sanity check. 2748707e8a07SDavid Sterba */ 2749707e8a07SDavid Sterba if (le32_to_cpu(disk_super->__unused_leafsize) != 2750727011e0SChris Mason btrfs_super_nodesize(disk_super)) { 2751727011e0SChris Mason printk(KERN_ERR "BTRFS: couldn't mount because metadata " 2752727011e0SChris Mason "blocksizes don't match. node %d leaf %d\n", 2753727011e0SChris Mason btrfs_super_nodesize(disk_super), 2754707e8a07SDavid Sterba le32_to_cpu(disk_super->__unused_leafsize)); 2755727011e0SChris Mason err = -EINVAL; 2756727011e0SChris Mason goto fail_alloc; 2757727011e0SChris Mason } 2758707e8a07SDavid Sterba if (btrfs_super_nodesize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) { 2759727011e0SChris Mason printk(KERN_ERR "BTRFS: couldn't mount because metadata " 2760727011e0SChris Mason "blocksize (%d) was too large\n", 2761707e8a07SDavid Sterba btrfs_super_nodesize(disk_super)); 2762727011e0SChris Mason err = -EINVAL; 2763727011e0SChris Mason goto fail_alloc; 2764727011e0SChris Mason } 2765727011e0SChris Mason 27665d4f98a2SYan Zheng features = btrfs_super_incompat_flags(disk_super); 27675d4f98a2SYan Zheng features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; 276869e380d1SLi Zefan if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO) 2769a6fa6faeSLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 2770727011e0SChris Mason 27713173a18fSJosef Bacik if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA) 27725efa0490SDavid Sterba printk(KERN_INFO "BTRFS: has skinny extents\n"); 27733173a18fSJosef Bacik 2774727011e0SChris Mason /* 2775727011e0SChris Mason * flag our filesystem as having big metadata blocks if 2776727011e0SChris Mason * they are bigger than the page size 2777727011e0SChris Mason */ 2778707e8a07SDavid Sterba if (btrfs_super_nodesize(disk_super) > PAGE_CACHE_SIZE) { 2779727011e0SChris Mason if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA)) 2780efe120a0SFrank Holton printk(KERN_INFO "BTRFS: flagging fs with big metadata feature\n"); 2781727011e0SChris Mason features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA; 2782727011e0SChris Mason } 2783727011e0SChris Mason 2784bc3f116fSChris Mason nodesize = btrfs_super_nodesize(disk_super); 2785bc3f116fSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 2786bc3f116fSChris Mason stripesize = btrfs_super_stripesize(disk_super); 2787707e8a07SDavid Sterba fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids)); 2788963d678bSMiao Xie fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids)); 2789bc3f116fSChris Mason 2790bc3f116fSChris Mason /* 2791bc3f116fSChris Mason * mixed block groups end up with duplicate but slightly offset 2792bc3f116fSChris Mason * extent buffers for the same range. It leads to corruptions 2793bc3f116fSChris Mason */ 2794bc3f116fSChris Mason if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) && 2795707e8a07SDavid Sterba (sectorsize != nodesize)) { 2796aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: unequal leaf/node/sector sizes " 2797bc3f116fSChris Mason "are not allowed for mixed block groups on %s\n", 2798bc3f116fSChris Mason sb->s_id); 2799bc3f116fSChris Mason goto fail_alloc; 2800bc3f116fSChris Mason } 2801bc3f116fSChris Mason 2802ceda0864SMiao Xie /* 2803ceda0864SMiao Xie * Needn't use the lock because there is no other task which will 2804ceda0864SMiao Xie * update the flag. 2805ceda0864SMiao Xie */ 28065d4f98a2SYan Zheng btrfs_set_super_incompat_flags(disk_super, features); 28075d4f98a2SYan Zheng 2808f2b636e8SJosef Bacik features = btrfs_super_compat_ro_flags(disk_super) & 2809f2b636e8SJosef Bacik ~BTRFS_FEATURE_COMPAT_RO_SUPP; 2810f2b636e8SJosef Bacik if (!(sb->s_flags & MS_RDONLY) && features) { 2811f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " 2812f2b636e8SJosef Bacik "unsupported option features (%Lx).\n", 2813c1c9ff7cSGeert Uytterhoeven features); 2814f2b636e8SJosef Bacik err = -EINVAL; 281516cdcec7SMiao Xie goto fail_alloc; 2816f2b636e8SJosef Bacik } 281761d92c32SChris Mason 28185cdc7ad3SQu Wenruo max_active = fs_info->thread_pool_size; 281961d92c32SChris Mason 28202a458198SEric Sandeen ret = btrfs_init_workqueues(fs_info, fs_devices); 28212a458198SEric Sandeen if (ret) { 28222a458198SEric Sandeen err = ret; 28230dc3b84aSJosef Bacik goto fail_sb_buffer; 28240dc3b84aSJosef Bacik } 28254543df7eSChris Mason 28264575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 2827c8b97818SChris Mason fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, 2828c8b97818SChris Mason 4 * 1024 * 1024 / PAGE_CACHE_SIZE); 28294575c9ccSChris Mason 2830db94535dSChris Mason tree_root->nodesize = nodesize; 2831db94535dSChris Mason tree_root->sectorsize = sectorsize; 283287ee04ebSChris Mason tree_root->stripesize = stripesize; 2833a061fc8dSChris Mason 2834a061fc8dSChris Mason sb->s_blocksize = sectorsize; 2835a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 2836db94535dSChris Mason 28373cae210fSQu Wenruo if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) { 2838aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: valid FS not found on %s\n", sb->s_id); 283939279cc3SChris Mason goto fail_sb_buffer; 284039279cc3SChris Mason } 284119c00ddcSChris Mason 28428d082fb7SLiu Bo if (sectorsize != PAGE_SIZE) { 2843aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: incompatible sector size (%lu) " 28448d082fb7SLiu Bo "found on %s\n", (unsigned long)sectorsize, sb->s_id); 2845941b2ddfSKeith Mannthey goto fail_sb_buffer; 2846941b2ddfSKeith Mannthey } 2847941b2ddfSKeith Mannthey 2848925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 2849e4404d6eSYan Zheng ret = btrfs_read_sys_array(tree_root); 2850925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 285184eed90fSChris Mason if (ret) { 2852aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to read the system " 2853d397712bSChris Mason "array on %s\n", sb->s_id); 28545d4f98a2SYan Zheng goto fail_sb_buffer; 285584eed90fSChris Mason } 28560b86a832SChris Mason 285784234f3aSYan Zheng generation = btrfs_super_chunk_root_generation(disk_super); 28580b86a832SChris Mason 2859707e8a07SDavid Sterba __setup_root(nodesize, sectorsize, stripesize, chunk_root, 2860707e8a07SDavid Sterba fs_info, BTRFS_CHUNK_TREE_OBJECTID); 28610b86a832SChris Mason 28620b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 28630b86a832SChris Mason btrfs_super_chunk_root(disk_super), 2864ce86cd59SDavid Sterba generation); 286564c043deSLiu Bo if (IS_ERR(chunk_root->node) || 286664c043deSLiu Bo !extent_buffer_uptodate(chunk_root->node)) { 2867aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to read chunk root on %s\n", 286883121942SDavid Woodhouse sb->s_id); 2869e5fffbacSchandan if (!IS_ERR(chunk_root->node)) 2870e5fffbacSchandan free_extent_buffer(chunk_root->node); 287195ab1f64SZhao Lei chunk_root->node = NULL; 2872af31f5e5SChris Mason goto fail_tree_roots; 287383121942SDavid Woodhouse } 28745d4f98a2SYan Zheng btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); 28755d4f98a2SYan Zheng chunk_root->commit_root = btrfs_root_node(chunk_root); 28760b86a832SChris Mason 2877e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 2878b308bc2fSGeert Uytterhoeven btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE); 2879e17cade2SChris Mason 28800b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 28812b82032cSYan Zheng if (ret) { 2882aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to read chunk tree on %s\n", 2883d397712bSChris Mason sb->s_id); 2884af31f5e5SChris Mason goto fail_tree_roots; 28852b82032cSYan Zheng } 28860b86a832SChris Mason 28878dabb742SStefan Behrens /* 28888dabb742SStefan Behrens * keep the device that is marked to be the target device for the 28898dabb742SStefan Behrens * dev_replace procedure 28908dabb742SStefan Behrens */ 28919eaed21eSEric Sandeen btrfs_close_extra_devices(fs_devices, 0); 2892dfe25020SChris Mason 2893a6b0d5c8SChris Mason if (!fs_devices->latest_bdev) { 2894aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to read devices on %s\n", 2895a6b0d5c8SChris Mason sb->s_id); 2896a6b0d5c8SChris Mason goto fail_tree_roots; 2897a6b0d5c8SChris Mason } 2898a6b0d5c8SChris Mason 2899af31f5e5SChris Mason retry_root_backup: 290084234f3aSYan Zheng generation = btrfs_super_generation(disk_super); 29010b86a832SChris Mason 2902e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 2903db94535dSChris Mason btrfs_super_root(disk_super), 2904ce86cd59SDavid Sterba generation); 290564c043deSLiu Bo if (IS_ERR(tree_root->node) || 290664c043deSLiu Bo !extent_buffer_uptodate(tree_root->node)) { 2907efe120a0SFrank Holton printk(KERN_WARNING "BTRFS: failed to read tree root on %s\n", 290883121942SDavid Woodhouse sb->s_id); 2909e5fffbacSchandan if (!IS_ERR(tree_root->node)) 2910e5fffbacSchandan free_extent_buffer(tree_root->node); 291195ab1f64SZhao Lei tree_root->node = NULL; 2912af31f5e5SChris Mason goto recovery_tree_root; 291383121942SDavid Woodhouse } 2914af31f5e5SChris Mason 29155d4f98a2SYan Zheng btrfs_set_root_node(&tree_root->root_item, tree_root->node); 29165d4f98a2SYan Zheng tree_root->commit_root = btrfs_root_node(tree_root); 291769e9c6c6SStefan Behrens btrfs_set_root_refs(&tree_root->root_item, 1); 2918db94535dSChris Mason 2919f32e48e9SChandan Rajendra mutex_lock(&tree_root->objectid_mutex); 2920f32e48e9SChandan Rajendra ret = btrfs_find_highest_objectid(tree_root, 2921f32e48e9SChandan Rajendra &tree_root->highest_objectid); 2922f32e48e9SChandan Rajendra if (ret) { 2923f32e48e9SChandan Rajendra mutex_unlock(&tree_root->objectid_mutex); 2924f32e48e9SChandan Rajendra goto recovery_tree_root; 2925f32e48e9SChandan Rajendra } 2926f32e48e9SChandan Rajendra 2927f32e48e9SChandan Rajendra ASSERT(tree_root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID); 2928f32e48e9SChandan Rajendra 2929f32e48e9SChandan Rajendra mutex_unlock(&tree_root->objectid_mutex); 2930f32e48e9SChandan Rajendra 29314bbcaa64SEric Sandeen ret = btrfs_read_roots(fs_info, tree_root); 29324bbcaa64SEric Sandeen if (ret) 2933af31f5e5SChris Mason goto recovery_tree_root; 2934f7a81ea4SStefan Behrens 29358929ecfaSYan, Zheng fs_info->generation = generation; 29368929ecfaSYan, Zheng fs_info->last_trans_committed = generation; 29378929ecfaSYan, Zheng 293868310a5eSIlya Dryomov ret = btrfs_recover_balance(fs_info); 293968310a5eSIlya Dryomov if (ret) { 2940aa8ee312SDavid Sterba printk(KERN_ERR "BTRFS: failed to recover balance\n"); 294168310a5eSIlya Dryomov goto fail_block_groups; 294268310a5eSIlya Dryomov } 294368310a5eSIlya Dryomov 2944733f4fbbSStefan Behrens ret = btrfs_init_dev_stats(fs_info); 2945733f4fbbSStefan Behrens if (ret) { 2946efe120a0SFrank Holton printk(KERN_ERR "BTRFS: failed to init dev_stats: %d\n", 2947733f4fbbSStefan Behrens ret); 2948733f4fbbSStefan Behrens goto fail_block_groups; 2949733f4fbbSStefan Behrens } 2950733f4fbbSStefan Behrens 29518dabb742SStefan Behrens ret = btrfs_init_dev_replace(fs_info); 29528dabb742SStefan Behrens if (ret) { 2953efe120a0SFrank Holton pr_err("BTRFS: failed to init dev_replace: %d\n", ret); 29548dabb742SStefan Behrens goto fail_block_groups; 29558dabb742SStefan Behrens } 29568dabb742SStefan Behrens 29579eaed21eSEric Sandeen btrfs_close_extra_devices(fs_devices, 1); 29588dabb742SStefan Behrens 2959b7c35e81SAnand Jain ret = btrfs_sysfs_add_fsid(fs_devices, NULL); 2960b7c35e81SAnand Jain if (ret) { 2961b7c35e81SAnand Jain pr_err("BTRFS: failed to init sysfs fsid interface: %d\n", ret); 2962b7c35e81SAnand Jain goto fail_block_groups; 2963b7c35e81SAnand Jain } 2964b7c35e81SAnand Jain 2965b7c35e81SAnand Jain ret = btrfs_sysfs_add_device(fs_devices); 2966b7c35e81SAnand Jain if (ret) { 2967b7c35e81SAnand Jain pr_err("BTRFS: failed to init sysfs device interface: %d\n", ret); 2968b7c35e81SAnand Jain goto fail_fsdev_sysfs; 2969b7c35e81SAnand Jain } 2970b7c35e81SAnand Jain 297196f3136eSAnand Jain ret = btrfs_sysfs_add_mounted(fs_info); 29725ac1d209SJeff Mahoney if (ret) { 2973efe120a0SFrank Holton pr_err("BTRFS: failed to init sysfs interface: %d\n", ret); 2974b7c35e81SAnand Jain goto fail_fsdev_sysfs; 29755ac1d209SJeff Mahoney } 29765ac1d209SJeff Mahoney 2977c59021f8Sliubo ret = btrfs_init_space_info(fs_info); 2978c59021f8Sliubo if (ret) { 2979efe120a0SFrank Holton printk(KERN_ERR "BTRFS: Failed to initial space info: %d\n", ret); 29802365dd3cSAnand Jain goto fail_sysfs; 2981c59021f8Sliubo } 2982c59021f8Sliubo 29834bbcaa64SEric Sandeen ret = btrfs_read_block_groups(fs_info->extent_root); 29841b1d1f66SJosef Bacik if (ret) { 2985efe120a0SFrank Holton printk(KERN_ERR "BTRFS: Failed to read block groups: %d\n", ret); 29862365dd3cSAnand Jain goto fail_sysfs; 29871b1d1f66SJosef Bacik } 29885af3e8ccSStefan Behrens fs_info->num_tolerated_disk_barrier_failures = 29895af3e8ccSStefan Behrens btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); 2990292fd7fcSStefan Behrens if (fs_info->fs_devices->missing_devices > 2991292fd7fcSStefan Behrens fs_info->num_tolerated_disk_barrier_failures && 2992292fd7fcSStefan Behrens !(sb->s_flags & MS_RDONLY)) { 299378fa1770SZhao Lei pr_warn("BTRFS: missing devices(%llu) exceeds the limit(%d), writeable mount is not allowed\n", 299478fa1770SZhao Lei fs_info->fs_devices->missing_devices, 299578fa1770SZhao Lei fs_info->num_tolerated_disk_barrier_failures); 29962365dd3cSAnand Jain goto fail_sysfs; 2997292fd7fcSStefan Behrens } 29989078a3e1SChris Mason 2999a74a4b97SChris Mason fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, 3000a74a4b97SChris Mason "btrfs-cleaner"); 300157506d50SQinghuang Feng if (IS_ERR(fs_info->cleaner_kthread)) 30022365dd3cSAnand Jain goto fail_sysfs; 3003a74a4b97SChris Mason 3004a74a4b97SChris Mason fs_info->transaction_kthread = kthread_run(transaction_kthread, 3005a74a4b97SChris Mason tree_root, 3006a74a4b97SChris Mason "btrfs-transaction"); 300757506d50SQinghuang Feng if (IS_ERR(fs_info->transaction_kthread)) 30083f157a2fSChris Mason goto fail_cleaner; 3009a74a4b97SChris Mason 3010c289811cSChris Mason if (!btrfs_test_opt(tree_root, SSD) && 3011c289811cSChris Mason !btrfs_test_opt(tree_root, NOSSD) && 3012c289811cSChris Mason !fs_info->fs_devices->rotating) { 3013efe120a0SFrank Holton printk(KERN_INFO "BTRFS: detected SSD devices, enabling SSD " 3014c289811cSChris Mason "mode\n"); 3015c289811cSChris Mason btrfs_set_opt(fs_info->mount_opt, SSD); 3016c289811cSChris Mason } 3017c289811cSChris Mason 3018572d9ab7SDavid Sterba /* 3019572d9ab7SDavid Sterba * Mount does not set all options immediatelly, we can do it now and do 3020572d9ab7SDavid Sterba * not have to wait for transaction commit 3021572d9ab7SDavid Sterba */ 3022572d9ab7SDavid Sterba btrfs_apply_pending_changes(fs_info); 30233818aea2SQu Wenruo 302421adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 302521adbd5cSStefan Behrens if (btrfs_test_opt(tree_root, CHECK_INTEGRITY)) { 302621adbd5cSStefan Behrens ret = btrfsic_mount(tree_root, fs_devices, 302721adbd5cSStefan Behrens btrfs_test_opt(tree_root, 302821adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ? 302921adbd5cSStefan Behrens 1 : 0, 303021adbd5cSStefan Behrens fs_info->check_integrity_print_mask); 303121adbd5cSStefan Behrens if (ret) 3032efe120a0SFrank Holton printk(KERN_WARNING "BTRFS: failed to initialize" 303321adbd5cSStefan Behrens " integrity check module %s\n", sb->s_id); 303421adbd5cSStefan Behrens } 303521adbd5cSStefan Behrens #endif 3036bcef60f2SArne Jansen ret = btrfs_read_qgroup_config(fs_info); 3037bcef60f2SArne Jansen if (ret) 3038bcef60f2SArne Jansen goto fail_trans_kthread; 303921adbd5cSStefan Behrens 3040acce952bSliubo /* do not make disk changes in broken FS */ 304168ce9682SStefan Behrens if (btrfs_super_log_root(disk_super) != 0) { 304263443bf5SEric Sandeen ret = btrfs_replay_log(fs_info, fs_devices); 304379787eaaSJeff Mahoney if (ret) { 304463443bf5SEric Sandeen err = ret; 304528c16cbbSWang Shilong goto fail_qgroup; 3046e556ce2cSYan Zheng } 3047e02119d5SChris Mason } 30481a40e23bSZheng Yan 304976dda93cSYan, Zheng ret = btrfs_find_orphan_roots(tree_root); 305079787eaaSJeff Mahoney if (ret) 305128c16cbbSWang Shilong goto fail_qgroup; 305276dda93cSYan, Zheng 30537c2ca468SChris Mason if (!(sb->s_flags & MS_RDONLY)) { 3054d68fc57bSYan, Zheng ret = btrfs_cleanup_fs_roots(fs_info); 305544c44af2SIlya Dryomov if (ret) 305628c16cbbSWang Shilong goto fail_qgroup; 3057d68fc57bSYan, Zheng 30585f316481SWang Shilong mutex_lock(&fs_info->cleaner_mutex); 30595d4f98a2SYan Zheng ret = btrfs_recover_relocation(tree_root); 30605f316481SWang Shilong mutex_unlock(&fs_info->cleaner_mutex); 3061d7ce5843SMiao Xie if (ret < 0) { 3062d7ce5843SMiao Xie printk(KERN_WARNING 3063efe120a0SFrank Holton "BTRFS: failed to recover relocation\n"); 3064d7ce5843SMiao Xie err = -EINVAL; 3065bcef60f2SArne Jansen goto fail_qgroup; 3066d7ce5843SMiao Xie } 30677c2ca468SChris Mason } 30681a40e23bSZheng Yan 30693de4586cSChris Mason location.objectid = BTRFS_FS_TREE_OBJECTID; 30703de4586cSChris Mason location.type = BTRFS_ROOT_ITEM_KEY; 3071cb517eabSMiao Xie location.offset = 0; 30723de4586cSChris Mason 30733de4586cSChris Mason fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); 30743140c9a3SDan Carpenter if (IS_ERR(fs_info->fs_root)) { 30753140c9a3SDan Carpenter err = PTR_ERR(fs_info->fs_root); 3076bcef60f2SArne Jansen goto fail_qgroup; 30773140c9a3SDan Carpenter } 3078c289811cSChris Mason 30792b6ba629SIlya Dryomov if (sb->s_flags & MS_RDONLY) 30802b6ba629SIlya Dryomov return 0; 30812b6ba629SIlya Dryomov 3082e3acc2a6SJosef Bacik down_read(&fs_info->cleanup_work_sem); 30832b6ba629SIlya Dryomov if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) || 30842b6ba629SIlya Dryomov (ret = btrfs_orphan_cleanup(fs_info->tree_root))) { 30852b6ba629SIlya Dryomov up_read(&fs_info->cleanup_work_sem); 30862b6ba629SIlya Dryomov close_ctree(tree_root); 30872b6ba629SIlya Dryomov return ret; 30882b6ba629SIlya Dryomov } 3089e3acc2a6SJosef Bacik up_read(&fs_info->cleanup_work_sem); 309059641015SIlya Dryomov 30912b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 30922b6ba629SIlya Dryomov if (ret) { 3093efe120a0SFrank Holton printk(KERN_WARNING "BTRFS: failed to resume balance\n"); 309466b4ffd1SJosef Bacik close_ctree(tree_root); 30952b6ba629SIlya Dryomov return ret; 3096e3acc2a6SJosef Bacik } 3097e3acc2a6SJosef Bacik 30988dabb742SStefan Behrens ret = btrfs_resume_dev_replace_async(fs_info); 30998dabb742SStefan Behrens if (ret) { 3100efe120a0SFrank Holton pr_warn("BTRFS: failed to resume dev_replace\n"); 31018dabb742SStefan Behrens close_ctree(tree_root); 31028dabb742SStefan Behrens return ret; 31038dabb742SStefan Behrens } 31048dabb742SStefan Behrens 3105b382a324SJan Schmidt btrfs_qgroup_rescan_resume(fs_info); 3106b382a324SJan Schmidt 31074bbcaa64SEric Sandeen if (!fs_info->uuid_root) { 3108efe120a0SFrank Holton pr_info("BTRFS: creating UUID tree\n"); 3109f7a81ea4SStefan Behrens ret = btrfs_create_uuid_tree(fs_info); 3110f7a81ea4SStefan Behrens if (ret) { 3111efe120a0SFrank Holton pr_warn("BTRFS: failed to create the UUID tree %d\n", 3112f7a81ea4SStefan Behrens ret); 3113f7a81ea4SStefan Behrens close_ctree(tree_root); 3114f7a81ea4SStefan Behrens return ret; 3115f7a81ea4SStefan Behrens } 31164bbcaa64SEric Sandeen } else if (btrfs_test_opt(tree_root, RESCAN_UUID_TREE) || 31174bbcaa64SEric Sandeen fs_info->generation != 31184bbcaa64SEric Sandeen btrfs_super_uuid_tree_generation(disk_super)) { 3119efe120a0SFrank Holton pr_info("BTRFS: checking UUID tree\n"); 312070f80175SStefan Behrens ret = btrfs_check_uuid_tree(fs_info); 312170f80175SStefan Behrens if (ret) { 3122efe120a0SFrank Holton pr_warn("BTRFS: failed to check the UUID tree %d\n", 312370f80175SStefan Behrens ret); 312470f80175SStefan Behrens close_ctree(tree_root); 312570f80175SStefan Behrens return ret; 312670f80175SStefan Behrens } 312770f80175SStefan Behrens } else { 312870f80175SStefan Behrens fs_info->update_uuid_tree_gen = 1; 3129f7a81ea4SStefan Behrens } 3130f7a81ea4SStefan Behrens 313147ab2a6cSJosef Bacik fs_info->open = 1; 313247ab2a6cSJosef Bacik 3133ad2b2c80SAl Viro return 0; 313439279cc3SChris Mason 3135bcef60f2SArne Jansen fail_qgroup: 3136bcef60f2SArne Jansen btrfs_free_qgroup_config(fs_info); 31377c2ca468SChris Mason fail_trans_kthread: 31387c2ca468SChris Mason kthread_stop(fs_info->transaction_kthread); 313954067ae9SJosef Bacik btrfs_cleanup_transaction(fs_info->tree_root); 3140faa2dbf0SJosef Bacik btrfs_free_fs_roots(fs_info); 31413f157a2fSChris Mason fail_cleaner: 3142a74a4b97SChris Mason kthread_stop(fs_info->cleaner_kthread); 31437c2ca468SChris Mason 31447c2ca468SChris Mason /* 31457c2ca468SChris Mason * make sure we're done with the btree inode before we stop our 31467c2ca468SChris Mason * kthreads 31477c2ca468SChris Mason */ 31487c2ca468SChris Mason filemap_write_and_wait(fs_info->btree_inode->i_mapping); 31497c2ca468SChris Mason 31502365dd3cSAnand Jain fail_sysfs: 31516618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 31522365dd3cSAnand Jain 3153b7c35e81SAnand Jain fail_fsdev_sysfs: 3154b7c35e81SAnand Jain btrfs_sysfs_remove_fsid(fs_info->fs_devices); 3155b7c35e81SAnand Jain 31561b1d1f66SJosef Bacik fail_block_groups: 315754067ae9SJosef Bacik btrfs_put_block_group_cache(fs_info); 31581b1d1f66SJosef Bacik btrfs_free_block_groups(fs_info); 3159af31f5e5SChris Mason 3160af31f5e5SChris Mason fail_tree_roots: 3161af31f5e5SChris Mason free_root_pointers(fs_info, 1); 31622b8195bbSMiao Xie invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 3163af31f5e5SChris Mason 316439279cc3SChris Mason fail_sb_buffer: 31657abadb64SLiu Bo btrfs_stop_all_workers(fs_info); 316616cdcec7SMiao Xie fail_alloc: 31674543df7eSChris Mason fail_iput: 3168586e46e2SIlya Dryomov btrfs_mapping_tree_free(&fs_info->mapping_tree); 3169586e46e2SIlya Dryomov 31704543df7eSChris Mason iput(fs_info->btree_inode); 3171c404e0dcSMiao Xie fail_bio_counter: 3172c404e0dcSMiao Xie percpu_counter_destroy(&fs_info->bio_counter); 3173963d678bSMiao Xie fail_delalloc_bytes: 3174963d678bSMiao Xie percpu_counter_destroy(&fs_info->delalloc_bytes); 3175e2d84521SMiao Xie fail_dirty_metadata_bytes: 3176e2d84521SMiao Xie percpu_counter_destroy(&fs_info->dirty_metadata_bytes); 3177ad081f14SJens Axboe fail_bdi: 31787e662854SQinghuang Feng bdi_destroy(&fs_info->bdi); 317976dda93cSYan, Zheng fail_srcu: 318076dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 31817e662854SQinghuang Feng fail: 318253b381b3SDavid Woodhouse btrfs_free_stripe_hash_table(fs_info); 3183586e46e2SIlya Dryomov btrfs_close_devices(fs_info->fs_devices); 3184ad2b2c80SAl Viro return err; 3185af31f5e5SChris Mason 3186af31f5e5SChris Mason recovery_tree_root: 3187af31f5e5SChris Mason if (!btrfs_test_opt(tree_root, RECOVERY)) 3188af31f5e5SChris Mason goto fail_tree_roots; 3189af31f5e5SChris Mason 3190af31f5e5SChris Mason free_root_pointers(fs_info, 0); 3191af31f5e5SChris Mason 3192af31f5e5SChris Mason /* don't use the log in recovery mode, it won't be valid */ 3193af31f5e5SChris Mason btrfs_set_super_log_root(disk_super, 0); 3194af31f5e5SChris Mason 3195af31f5e5SChris Mason /* we can't trust the free space cache either */ 3196af31f5e5SChris Mason btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE); 3197af31f5e5SChris Mason 3198af31f5e5SChris Mason ret = next_root_backup(fs_info, fs_info->super_copy, 3199af31f5e5SChris Mason &num_backups_tried, &backup_index); 3200af31f5e5SChris Mason if (ret == -1) 3201af31f5e5SChris Mason goto fail_block_groups; 3202af31f5e5SChris Mason goto retry_root_backup; 3203eb60ceacSChris Mason } 3204eb60ceacSChris Mason 3205f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 3206f2984462SChris Mason { 3207f2984462SChris Mason if (uptodate) { 3208f2984462SChris Mason set_buffer_uptodate(bh); 3209f2984462SChris Mason } else { 3210442a4f63SStefan Behrens struct btrfs_device *device = (struct btrfs_device *) 3211442a4f63SStefan Behrens bh->b_private; 3212442a4f63SStefan Behrens 3213b14af3b4SDavid Sterba btrfs_warn_rl_in_rcu(device->dev_root->fs_info, 3214b14af3b4SDavid Sterba "lost page write due to IO error on %s", 3215606686eeSJosef Bacik rcu_str_deref(device->name)); 32161259ab75SChris Mason /* note, we dont' set_buffer_write_io_error because we have 32171259ab75SChris Mason * our own ways of dealing with the IO errors 32181259ab75SChris Mason */ 3219f2984462SChris Mason clear_buffer_uptodate(bh); 3220442a4f63SStefan Behrens btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS); 3221f2984462SChris Mason } 3222f2984462SChris Mason unlock_buffer(bh); 3223f2984462SChris Mason put_bh(bh); 3224f2984462SChris Mason } 3225f2984462SChris Mason 322629c36d72SAnand Jain int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num, 322729c36d72SAnand Jain struct buffer_head **bh_ret) 322829c36d72SAnand Jain { 322929c36d72SAnand Jain struct buffer_head *bh; 323029c36d72SAnand Jain struct btrfs_super_block *super; 323129c36d72SAnand Jain u64 bytenr; 323229c36d72SAnand Jain 323329c36d72SAnand Jain bytenr = btrfs_sb_offset(copy_num); 323429c36d72SAnand Jain if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode)) 323529c36d72SAnand Jain return -EINVAL; 323629c36d72SAnand Jain 323729c36d72SAnand Jain bh = __bread(bdev, bytenr / 4096, BTRFS_SUPER_INFO_SIZE); 323829c36d72SAnand Jain /* 323929c36d72SAnand Jain * If we fail to read from the underlying devices, as of now 324029c36d72SAnand Jain * the best option we have is to mark it EIO. 324129c36d72SAnand Jain */ 324229c36d72SAnand Jain if (!bh) 324329c36d72SAnand Jain return -EIO; 324429c36d72SAnand Jain 324529c36d72SAnand Jain super = (struct btrfs_super_block *)bh->b_data; 324629c36d72SAnand Jain if (btrfs_super_bytenr(super) != bytenr || 324729c36d72SAnand Jain btrfs_super_magic(super) != BTRFS_MAGIC) { 324829c36d72SAnand Jain brelse(bh); 324929c36d72SAnand Jain return -EINVAL; 325029c36d72SAnand Jain } 325129c36d72SAnand Jain 325229c36d72SAnand Jain *bh_ret = bh; 325329c36d72SAnand Jain return 0; 325429c36d72SAnand Jain } 325529c36d72SAnand Jain 325629c36d72SAnand Jain 3257a512bbf8SYan Zheng struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) 3258a512bbf8SYan Zheng { 3259a512bbf8SYan Zheng struct buffer_head *bh; 3260a512bbf8SYan Zheng struct buffer_head *latest = NULL; 3261a512bbf8SYan Zheng struct btrfs_super_block *super; 3262a512bbf8SYan Zheng int i; 3263a512bbf8SYan Zheng u64 transid = 0; 326492fc03fbSAnand Jain int ret = -EINVAL; 3265a512bbf8SYan Zheng 3266a512bbf8SYan Zheng /* we would like to check all the supers, but that would make 3267a512bbf8SYan Zheng * a btrfs mount succeed after a mkfs from a different FS. 3268a512bbf8SYan Zheng * So, we need to add a special mount option to scan for 3269a512bbf8SYan Zheng * later supers, using BTRFS_SUPER_MIRROR_MAX instead 3270a512bbf8SYan Zheng */ 3271a512bbf8SYan Zheng for (i = 0; i < 1; i++) { 327229c36d72SAnand Jain ret = btrfs_read_dev_one_super(bdev, i, &bh); 327329c36d72SAnand Jain if (ret) 3274a512bbf8SYan Zheng continue; 3275a512bbf8SYan Zheng 3276a512bbf8SYan Zheng super = (struct btrfs_super_block *)bh->b_data; 3277a512bbf8SYan Zheng 3278a512bbf8SYan Zheng if (!latest || btrfs_super_generation(super) > transid) { 3279a512bbf8SYan Zheng brelse(latest); 3280a512bbf8SYan Zheng latest = bh; 3281a512bbf8SYan Zheng transid = btrfs_super_generation(super); 3282a512bbf8SYan Zheng } else { 3283a512bbf8SYan Zheng brelse(bh); 3284a512bbf8SYan Zheng } 3285a512bbf8SYan Zheng } 328692fc03fbSAnand Jain 328792fc03fbSAnand Jain if (!latest) 328892fc03fbSAnand Jain return ERR_PTR(ret); 328992fc03fbSAnand Jain 3290a512bbf8SYan Zheng return latest; 3291a512bbf8SYan Zheng } 3292a512bbf8SYan Zheng 32934eedeb75SHisashi Hifumi /* 32944eedeb75SHisashi Hifumi * this should be called twice, once with wait == 0 and 32954eedeb75SHisashi Hifumi * once with wait == 1. When wait == 0 is done, all the buffer heads 32964eedeb75SHisashi Hifumi * we write are pinned. 32974eedeb75SHisashi Hifumi * 32984eedeb75SHisashi Hifumi * They are released when wait == 1 is done. 32994eedeb75SHisashi Hifumi * max_mirrors must be the same for both runs, and it indicates how 33004eedeb75SHisashi Hifumi * many supers on this one device should be written. 33014eedeb75SHisashi Hifumi * 33024eedeb75SHisashi Hifumi * max_mirrors == 0 means to write them all. 33034eedeb75SHisashi Hifumi */ 3304a512bbf8SYan Zheng static int write_dev_supers(struct btrfs_device *device, 3305a512bbf8SYan Zheng struct btrfs_super_block *sb, 3306a512bbf8SYan Zheng int do_barriers, int wait, int max_mirrors) 3307a512bbf8SYan Zheng { 3308a512bbf8SYan Zheng struct buffer_head *bh; 3309a512bbf8SYan Zheng int i; 3310a512bbf8SYan Zheng int ret; 3311a512bbf8SYan Zheng int errors = 0; 3312a512bbf8SYan Zheng u32 crc; 3313a512bbf8SYan Zheng u64 bytenr; 3314a512bbf8SYan Zheng 3315a512bbf8SYan Zheng if (max_mirrors == 0) 3316a512bbf8SYan Zheng max_mirrors = BTRFS_SUPER_MIRROR_MAX; 3317a512bbf8SYan Zheng 3318a512bbf8SYan Zheng for (i = 0; i < max_mirrors; i++) { 3319a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 3320935e5cc9SMiao Xie if (bytenr + BTRFS_SUPER_INFO_SIZE >= 3321935e5cc9SMiao Xie device->commit_total_bytes) 3322a512bbf8SYan Zheng break; 3323a512bbf8SYan Zheng 3324a512bbf8SYan Zheng if (wait) { 3325a512bbf8SYan Zheng bh = __find_get_block(device->bdev, bytenr / 4096, 3326a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 3327634554dcSJosef Bacik if (!bh) { 3328634554dcSJosef Bacik errors++; 3329634554dcSJosef Bacik continue; 3330634554dcSJosef Bacik } 3331a512bbf8SYan Zheng wait_on_buffer(bh); 33324eedeb75SHisashi Hifumi if (!buffer_uptodate(bh)) 33334eedeb75SHisashi Hifumi errors++; 33344eedeb75SHisashi Hifumi 33354eedeb75SHisashi Hifumi /* drop our reference */ 33364eedeb75SHisashi Hifumi brelse(bh); 33374eedeb75SHisashi Hifumi 33384eedeb75SHisashi Hifumi /* drop the reference from the wait == 0 run */ 3339a512bbf8SYan Zheng brelse(bh); 3340a512bbf8SYan Zheng continue; 3341a512bbf8SYan Zheng } else { 3342a512bbf8SYan Zheng btrfs_set_super_bytenr(sb, bytenr); 3343a512bbf8SYan Zheng 3344a512bbf8SYan Zheng crc = ~(u32)0; 3345b0496686SLiu Bo crc = btrfs_csum_data((char *)sb + 3346a512bbf8SYan Zheng BTRFS_CSUM_SIZE, crc, 3347a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE - 3348a512bbf8SYan Zheng BTRFS_CSUM_SIZE); 3349a512bbf8SYan Zheng btrfs_csum_final(crc, sb->csum); 3350a512bbf8SYan Zheng 33514eedeb75SHisashi Hifumi /* 33524eedeb75SHisashi Hifumi * one reference for us, and we leave it for the 33534eedeb75SHisashi Hifumi * caller 33544eedeb75SHisashi Hifumi */ 3355a512bbf8SYan Zheng bh = __getblk(device->bdev, bytenr / 4096, 3356a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 3357634554dcSJosef Bacik if (!bh) { 3358f14d104dSDavid Sterba btrfs_err(device->dev_root->fs_info, 3359f14d104dSDavid Sterba "couldn't get super buffer head for bytenr %llu", 3360f14d104dSDavid Sterba bytenr); 3361634554dcSJosef Bacik errors++; 3362634554dcSJosef Bacik continue; 3363634554dcSJosef Bacik } 3364634554dcSJosef Bacik 3365a512bbf8SYan Zheng memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 3366a512bbf8SYan Zheng 33674eedeb75SHisashi Hifumi /* one reference for submit_bh */ 3368a512bbf8SYan Zheng get_bh(bh); 33694eedeb75SHisashi Hifumi 33704eedeb75SHisashi Hifumi set_buffer_uptodate(bh); 3371a512bbf8SYan Zheng lock_buffer(bh); 3372a512bbf8SYan Zheng bh->b_end_io = btrfs_end_buffer_write_sync; 3373442a4f63SStefan Behrens bh->b_private = device; 3374a512bbf8SYan Zheng } 3375a512bbf8SYan Zheng 3376387125fcSChris Mason /* 3377387125fcSChris Mason * we fua the first super. The others we allow 3378387125fcSChris Mason * to go down lazy. 3379387125fcSChris Mason */ 3380e8117c26SWang Shilong if (i == 0) 338121adbd5cSStefan Behrens ret = btrfsic_submit_bh(WRITE_FUA, bh); 3382e8117c26SWang Shilong else 3383e8117c26SWang Shilong ret = btrfsic_submit_bh(WRITE_SYNC, bh); 33844eedeb75SHisashi Hifumi if (ret) 3385a512bbf8SYan Zheng errors++; 3386a512bbf8SYan Zheng } 3387a512bbf8SYan Zheng return errors < i ? 0 : -1; 3388a512bbf8SYan Zheng } 3389a512bbf8SYan Zheng 3390387125fcSChris Mason /* 3391387125fcSChris Mason * endio for the write_dev_flush, this will wake anyone waiting 3392387125fcSChris Mason * for the barrier when it is done 3393387125fcSChris Mason */ 33944246a0b6SChristoph Hellwig static void btrfs_end_empty_barrier(struct bio *bio) 3395387125fcSChris Mason { 3396387125fcSChris Mason if (bio->bi_private) 3397387125fcSChris Mason complete(bio->bi_private); 3398387125fcSChris Mason bio_put(bio); 3399387125fcSChris Mason } 3400387125fcSChris Mason 3401387125fcSChris Mason /* 3402387125fcSChris Mason * trigger flushes for one the devices. If you pass wait == 0, the flushes are 3403387125fcSChris Mason * sent down. With wait == 1, it waits for the previous flush. 3404387125fcSChris Mason * 3405387125fcSChris Mason * any device where the flush fails with eopnotsupp are flagged as not-barrier 3406387125fcSChris Mason * capable 3407387125fcSChris Mason */ 3408387125fcSChris Mason static int write_dev_flush(struct btrfs_device *device, int wait) 3409387125fcSChris Mason { 3410387125fcSChris Mason struct bio *bio; 3411387125fcSChris Mason int ret = 0; 3412387125fcSChris Mason 3413387125fcSChris Mason if (device->nobarriers) 3414387125fcSChris Mason return 0; 3415387125fcSChris Mason 3416387125fcSChris Mason if (wait) { 3417387125fcSChris Mason bio = device->flush_bio; 3418387125fcSChris Mason if (!bio) 3419387125fcSChris Mason return 0; 3420387125fcSChris Mason 3421387125fcSChris Mason wait_for_completion(&device->flush_wait); 3422387125fcSChris Mason 34234246a0b6SChristoph Hellwig if (bio->bi_error) { 34244246a0b6SChristoph Hellwig ret = bio->bi_error; 3425442a4f63SStefan Behrens btrfs_dev_stat_inc_and_print(device, 3426442a4f63SStefan Behrens BTRFS_DEV_STAT_FLUSH_ERRS); 3427387125fcSChris Mason } 3428387125fcSChris Mason 3429387125fcSChris Mason /* drop the reference from the wait == 0 run */ 3430387125fcSChris Mason bio_put(bio); 3431387125fcSChris Mason device->flush_bio = NULL; 3432387125fcSChris Mason 3433387125fcSChris Mason return ret; 3434387125fcSChris Mason } 3435387125fcSChris Mason 3436387125fcSChris Mason /* 3437387125fcSChris Mason * one reference for us, and we leave it for the 3438387125fcSChris Mason * caller 3439387125fcSChris Mason */ 34409c017abcSJesper Juhl device->flush_bio = NULL; 34419be3395bSChris Mason bio = btrfs_io_bio_alloc(GFP_NOFS, 0); 3442387125fcSChris Mason if (!bio) 3443387125fcSChris Mason return -ENOMEM; 3444387125fcSChris Mason 3445387125fcSChris Mason bio->bi_end_io = btrfs_end_empty_barrier; 3446387125fcSChris Mason bio->bi_bdev = device->bdev; 3447387125fcSChris Mason init_completion(&device->flush_wait); 3448387125fcSChris Mason bio->bi_private = &device->flush_wait; 3449387125fcSChris Mason device->flush_bio = bio; 3450387125fcSChris Mason 3451387125fcSChris Mason bio_get(bio); 345221adbd5cSStefan Behrens btrfsic_submit_bio(WRITE_FLUSH, bio); 3453387125fcSChris Mason 3454387125fcSChris Mason return 0; 3455387125fcSChris Mason } 3456387125fcSChris Mason 3457387125fcSChris Mason /* 3458387125fcSChris Mason * send an empty flush down to each device in parallel, 3459387125fcSChris Mason * then wait for them 3460387125fcSChris Mason */ 3461387125fcSChris Mason static int barrier_all_devices(struct btrfs_fs_info *info) 3462387125fcSChris Mason { 3463387125fcSChris Mason struct list_head *head; 3464387125fcSChris Mason struct btrfs_device *dev; 34655af3e8ccSStefan Behrens int errors_send = 0; 34665af3e8ccSStefan Behrens int errors_wait = 0; 3467387125fcSChris Mason int ret; 3468387125fcSChris Mason 3469387125fcSChris Mason /* send down all the barriers */ 3470387125fcSChris Mason head = &info->fs_devices->devices; 3471387125fcSChris Mason list_for_each_entry_rcu(dev, head, dev_list) { 3472f88ba6a2SHidetoshi Seto if (dev->missing) 3473f88ba6a2SHidetoshi Seto continue; 3474387125fcSChris Mason if (!dev->bdev) { 34755af3e8ccSStefan Behrens errors_send++; 3476387125fcSChris Mason continue; 3477387125fcSChris Mason } 3478387125fcSChris Mason if (!dev->in_fs_metadata || !dev->writeable) 3479387125fcSChris Mason continue; 3480387125fcSChris Mason 3481387125fcSChris Mason ret = write_dev_flush(dev, 0); 3482387125fcSChris Mason if (ret) 34835af3e8ccSStefan Behrens errors_send++; 3484387125fcSChris Mason } 3485387125fcSChris Mason 3486387125fcSChris Mason /* wait for all the barriers */ 3487387125fcSChris Mason list_for_each_entry_rcu(dev, head, dev_list) { 3488f88ba6a2SHidetoshi Seto if (dev->missing) 3489f88ba6a2SHidetoshi Seto continue; 3490387125fcSChris Mason if (!dev->bdev) { 34915af3e8ccSStefan Behrens errors_wait++; 3492387125fcSChris Mason continue; 3493387125fcSChris Mason } 3494387125fcSChris Mason if (!dev->in_fs_metadata || !dev->writeable) 3495387125fcSChris Mason continue; 3496387125fcSChris Mason 3497387125fcSChris Mason ret = write_dev_flush(dev, 1); 3498387125fcSChris Mason if (ret) 34995af3e8ccSStefan Behrens errors_wait++; 3500387125fcSChris Mason } 35015af3e8ccSStefan Behrens if (errors_send > info->num_tolerated_disk_barrier_failures || 35025af3e8ccSStefan Behrens errors_wait > info->num_tolerated_disk_barrier_failures) 3503387125fcSChris Mason return -EIO; 3504387125fcSChris Mason return 0; 3505387125fcSChris Mason } 3506387125fcSChris Mason 3507943c6e99SZhao Lei int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags) 3508943c6e99SZhao Lei { 35098789f4feSZhao Lei int raid_type; 35108789f4feSZhao Lei int min_tolerated = INT_MAX; 3511943c6e99SZhao Lei 35128789f4feSZhao Lei if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 || 35138789f4feSZhao Lei (flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE)) 35148789f4feSZhao Lei min_tolerated = min(min_tolerated, 35158789f4feSZhao Lei btrfs_raid_array[BTRFS_RAID_SINGLE]. 35168789f4feSZhao Lei tolerated_failures); 3517943c6e99SZhao Lei 35188789f4feSZhao Lei for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) { 35198789f4feSZhao Lei if (raid_type == BTRFS_RAID_SINGLE) 35208789f4feSZhao Lei continue; 35218789f4feSZhao Lei if (!(flags & btrfs_raid_group[raid_type])) 35228789f4feSZhao Lei continue; 35238789f4feSZhao Lei min_tolerated = min(min_tolerated, 35248789f4feSZhao Lei btrfs_raid_array[raid_type]. 35258789f4feSZhao Lei tolerated_failures); 35268789f4feSZhao Lei } 3527943c6e99SZhao Lei 35288789f4feSZhao Lei if (min_tolerated == INT_MAX) { 35298789f4feSZhao Lei pr_warn("BTRFS: unknown raid flag: %llu\n", flags); 35308789f4feSZhao Lei min_tolerated = 0; 35318789f4feSZhao Lei } 35328789f4feSZhao Lei 35338789f4feSZhao Lei return min_tolerated; 3534943c6e99SZhao Lei } 3535943c6e99SZhao Lei 35365af3e8ccSStefan Behrens int btrfs_calc_num_tolerated_disk_barrier_failures( 35375af3e8ccSStefan Behrens struct btrfs_fs_info *fs_info) 35385af3e8ccSStefan Behrens { 35395af3e8ccSStefan Behrens struct btrfs_ioctl_space_info space; 35405af3e8ccSStefan Behrens struct btrfs_space_info *sinfo; 35415af3e8ccSStefan Behrens u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 35425af3e8ccSStefan Behrens BTRFS_BLOCK_GROUP_SYSTEM, 35435af3e8ccSStefan Behrens BTRFS_BLOCK_GROUP_METADATA, 35445af3e8ccSStefan Behrens BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 35455af3e8ccSStefan Behrens int i; 35465af3e8ccSStefan Behrens int c; 35475af3e8ccSStefan Behrens int num_tolerated_disk_barrier_failures = 35485af3e8ccSStefan Behrens (int)fs_info->fs_devices->num_devices; 35495af3e8ccSStefan Behrens 35502c458045SZhao Lei for (i = 0; i < ARRAY_SIZE(types); i++) { 35515af3e8ccSStefan Behrens struct btrfs_space_info *tmp; 35525af3e8ccSStefan Behrens 35535af3e8ccSStefan Behrens sinfo = NULL; 35545af3e8ccSStefan Behrens rcu_read_lock(); 35555af3e8ccSStefan Behrens list_for_each_entry_rcu(tmp, &fs_info->space_info, list) { 35565af3e8ccSStefan Behrens if (tmp->flags == types[i]) { 35575af3e8ccSStefan Behrens sinfo = tmp; 35585af3e8ccSStefan Behrens break; 35595af3e8ccSStefan Behrens } 35605af3e8ccSStefan Behrens } 35615af3e8ccSStefan Behrens rcu_read_unlock(); 35625af3e8ccSStefan Behrens 35635af3e8ccSStefan Behrens if (!sinfo) 35645af3e8ccSStefan Behrens continue; 35655af3e8ccSStefan Behrens 35665af3e8ccSStefan Behrens down_read(&sinfo->groups_sem); 35675af3e8ccSStefan Behrens for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 35685af3e8ccSStefan Behrens u64 flags; 35695af3e8ccSStefan Behrens 35702c458045SZhao Lei if (list_empty(&sinfo->block_groups[c])) 35712c458045SZhao Lei continue; 35722c458045SZhao Lei 35732c458045SZhao Lei btrfs_get_block_group_info(&sinfo->block_groups[c], 35742c458045SZhao Lei &space); 35752c458045SZhao Lei if (space.total_bytes == 0 || space.used_bytes == 0) 35765af3e8ccSStefan Behrens continue; 35775af3e8ccSStefan Behrens flags = space.flags; 3578943c6e99SZhao Lei 3579943c6e99SZhao Lei num_tolerated_disk_barrier_failures = min( 3580943c6e99SZhao Lei num_tolerated_disk_barrier_failures, 3581943c6e99SZhao Lei btrfs_get_num_tolerated_disk_barrier_failures( 3582943c6e99SZhao Lei flags)); 35835af3e8ccSStefan Behrens } 35845af3e8ccSStefan Behrens up_read(&sinfo->groups_sem); 35855af3e8ccSStefan Behrens } 35865af3e8ccSStefan Behrens 35875af3e8ccSStefan Behrens return num_tolerated_disk_barrier_failures; 35885af3e8ccSStefan Behrens } 35895af3e8ccSStefan Behrens 359048a3b636SEric Sandeen static int write_all_supers(struct btrfs_root *root, int max_mirrors) 3591f2984462SChris Mason { 3592e5e9a520SChris Mason struct list_head *head; 3593f2984462SChris Mason struct btrfs_device *dev; 3594a061fc8dSChris Mason struct btrfs_super_block *sb; 3595f2984462SChris Mason struct btrfs_dev_item *dev_item; 3596f2984462SChris Mason int ret; 3597f2984462SChris Mason int do_barriers; 3598a236aed1SChris Mason int max_errors; 3599a236aed1SChris Mason int total_errors = 0; 3600a061fc8dSChris Mason u64 flags; 3601f2984462SChris Mason 3602f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 3603af31f5e5SChris Mason backup_super_roots(root->fs_info); 3604f2984462SChris Mason 36056c41761fSDavid Sterba sb = root->fs_info->super_for_commit; 3606a061fc8dSChris Mason dev_item = &sb->dev_item; 3607e5e9a520SChris Mason 3608174ba509SChris Mason mutex_lock(&root->fs_info->fs_devices->device_list_mutex); 3609e5e9a520SChris Mason head = &root->fs_info->fs_devices->devices; 3610d7306801SFilipe David Borba Manana max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1; 3611387125fcSChris Mason 36125af3e8ccSStefan Behrens if (do_barriers) { 36135af3e8ccSStefan Behrens ret = barrier_all_devices(root->fs_info); 36145af3e8ccSStefan Behrens if (ret) { 36155af3e8ccSStefan Behrens mutex_unlock( 36165af3e8ccSStefan Behrens &root->fs_info->fs_devices->device_list_mutex); 3617a4553fefSAnand Jain btrfs_std_error(root->fs_info, ret, 36185af3e8ccSStefan Behrens "errors while submitting device barriers."); 36195af3e8ccSStefan Behrens return ret; 36205af3e8ccSStefan Behrens } 36215af3e8ccSStefan Behrens } 3622387125fcSChris Mason 36231f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 3624dfe25020SChris Mason if (!dev->bdev) { 3625dfe25020SChris Mason total_errors++; 3626dfe25020SChris Mason continue; 3627dfe25020SChris Mason } 36282b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 3629dfe25020SChris Mason continue; 3630dfe25020SChris Mason 36312b82032cSYan Zheng btrfs_set_stack_device_generation(dev_item, 0); 3632a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 3633a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 36347df69d3eSMiao Xie btrfs_set_stack_device_total_bytes(dev_item, 3635935e5cc9SMiao Xie dev->commit_total_bytes); 3636ce7213c7SMiao Xie btrfs_set_stack_device_bytes_used(dev_item, 3637ce7213c7SMiao Xie dev->commit_bytes_used); 3638a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 3639a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 3640a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 3641a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 36422b82032cSYan Zheng memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 3643a512bbf8SYan Zheng 3644a061fc8dSChris Mason flags = btrfs_super_flags(sb); 3645a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 3646f2984462SChris Mason 3647a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); 3648a236aed1SChris Mason if (ret) 3649a236aed1SChris Mason total_errors++; 3650f2984462SChris Mason } 3651a236aed1SChris Mason if (total_errors > max_errors) { 3652efe120a0SFrank Holton btrfs_err(root->fs_info, "%d errors while writing supers", 3653d397712bSChris Mason total_errors); 3654a724b436SStefan Behrens mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); 365579787eaaSJeff Mahoney 36569d565ba4SStefan Behrens /* FUA is masked off if unsupported and can't be the reason */ 3657a4553fefSAnand Jain btrfs_std_error(root->fs_info, -EIO, 36589d565ba4SStefan Behrens "%d errors while writing supers", total_errors); 36599d565ba4SStefan Behrens return -EIO; 3660a236aed1SChris Mason } 3661f2984462SChris Mason 3662a512bbf8SYan Zheng total_errors = 0; 36631f78160cSXiao Guangrong list_for_each_entry_rcu(dev, head, dev_list) { 3664dfe25020SChris Mason if (!dev->bdev) 3665dfe25020SChris Mason continue; 36662b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 3667dfe25020SChris Mason continue; 3668dfe25020SChris Mason 3669a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); 3670a512bbf8SYan Zheng if (ret) 36711259ab75SChris Mason total_errors++; 3672f2984462SChris Mason } 3673174ba509SChris Mason mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); 3674a236aed1SChris Mason if (total_errors > max_errors) { 3675a4553fefSAnand Jain btrfs_std_error(root->fs_info, -EIO, 367679787eaaSJeff Mahoney "%d errors while writing supers", total_errors); 367779787eaaSJeff Mahoney return -EIO; 3678a236aed1SChris Mason } 3679f2984462SChris Mason return 0; 3680f2984462SChris Mason } 3681f2984462SChris Mason 3682a512bbf8SYan Zheng int write_ctree_super(struct btrfs_trans_handle *trans, 3683a512bbf8SYan Zheng struct btrfs_root *root, int max_mirrors) 3684cfaa7295SChris Mason { 3685f570e757SRashika return write_all_supers(root, max_mirrors); 3686cfaa7295SChris Mason } 3687cfaa7295SChris Mason 3688cb517eabSMiao Xie /* Drop a fs root from the radix tree and free it. */ 3689cb517eabSMiao Xie void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 3690cb517eabSMiao Xie struct btrfs_root *root) 36912619ba1fSChris Mason { 36924df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 36932619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 36942619ba1fSChris Mason (unsigned long)root->root_key.objectid); 36954df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 369676dda93cSYan, Zheng 369776dda93cSYan, Zheng if (btrfs_root_refs(&root->root_item) == 0) 369876dda93cSYan, Zheng synchronize_srcu(&fs_info->subvol_srcu); 369976dda93cSYan, Zheng 37001a4319ccSLiu Bo if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) 37013321719eSLiu Bo btrfs_free_log(NULL, root); 37023321719eSLiu Bo 3703faa2dbf0SJosef Bacik if (root->free_ino_pinned) 3704581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_pinned); 3705faa2dbf0SJosef Bacik if (root->free_ino_ctl) 3706581bb050SLi Zefan __btrfs_remove_free_space_cache(root->free_ino_ctl); 37074df27c4dSYan, Zheng free_fs_root(root); 37084df27c4dSYan, Zheng } 37094df27c4dSYan, Zheng 37104df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root) 37114df27c4dSYan, Zheng { 371257cdc8dbSDavid Sterba iput(root->ino_cache_inode); 37134df27c4dSYan, Zheng WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); 37141cb048f5SFilipe David Borba Manana btrfs_free_block_rsv(root, root->orphan_block_rsv); 37151cb048f5SFilipe David Borba Manana root->orphan_block_rsv = NULL; 37160ee5dc67SAl Viro if (root->anon_dev) 37170ee5dc67SAl Viro free_anon_bdev(root->anon_dev); 37188257b2dcSMiao Xie if (root->subv_writers) 37198257b2dcSMiao Xie btrfs_free_subvolume_writers(root->subv_writers); 37205f39d397SChris Mason free_extent_buffer(root->node); 37215f39d397SChris Mason free_extent_buffer(root->commit_root); 3722581bb050SLi Zefan kfree(root->free_ino_ctl); 3723581bb050SLi Zefan kfree(root->free_ino_pinned); 372458176a96SJosef Bacik kfree(root->name); 3725b0feb9d9SMiao Xie btrfs_put_fs_root(root); 37262619ba1fSChris Mason } 37272619ba1fSChris Mason 3728cb517eabSMiao Xie void btrfs_free_fs_root(struct btrfs_root *root) 3729cb517eabSMiao Xie { 3730cb517eabSMiao Xie free_fs_root(root); 3731eb60ceacSChris Mason } 3732eb60ceacSChris Mason 3733c146afadSYan Zheng int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) 3734c146afadSYan Zheng { 3735c146afadSYan Zheng u64 root_objectid = 0; 3736c146afadSYan Zheng struct btrfs_root *gang[8]; 373765d33fd7SQu Wenruo int i = 0; 373865d33fd7SQu Wenruo int err = 0; 373965d33fd7SQu Wenruo unsigned int ret = 0; 374065d33fd7SQu Wenruo int index; 3741c146afadSYan Zheng 3742c146afadSYan Zheng while (1) { 374365d33fd7SQu Wenruo index = srcu_read_lock(&fs_info->subvol_srcu); 3744c146afadSYan Zheng ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 3745c146afadSYan Zheng (void **)gang, root_objectid, 3746c146afadSYan Zheng ARRAY_SIZE(gang)); 374765d33fd7SQu Wenruo if (!ret) { 374865d33fd7SQu Wenruo srcu_read_unlock(&fs_info->subvol_srcu, index); 3749c146afadSYan Zheng break; 375065d33fd7SQu Wenruo } 37515d4f98a2SYan Zheng root_objectid = gang[ret - 1]->root_key.objectid + 1; 375266b4ffd1SJosef Bacik 375365d33fd7SQu Wenruo for (i = 0; i < ret; i++) { 375465d33fd7SQu Wenruo /* Avoid to grab roots in dead_roots */ 375565d33fd7SQu Wenruo if (btrfs_root_refs(&gang[i]->root_item) == 0) { 375665d33fd7SQu Wenruo gang[i] = NULL; 375765d33fd7SQu Wenruo continue; 375865d33fd7SQu Wenruo } 375965d33fd7SQu Wenruo /* grab all the search result for later use */ 376065d33fd7SQu Wenruo gang[i] = btrfs_grab_fs_root(gang[i]); 376165d33fd7SQu Wenruo } 376265d33fd7SQu Wenruo srcu_read_unlock(&fs_info->subvol_srcu, index); 376365d33fd7SQu Wenruo 376465d33fd7SQu Wenruo for (i = 0; i < ret; i++) { 376565d33fd7SQu Wenruo if (!gang[i]) 376665d33fd7SQu Wenruo continue; 3767c146afadSYan Zheng root_objectid = gang[i]->root_key.objectid; 376866b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(gang[i]); 376966b4ffd1SJosef Bacik if (err) 377065d33fd7SQu Wenruo break; 377165d33fd7SQu Wenruo btrfs_put_fs_root(gang[i]); 3772c146afadSYan Zheng } 3773c146afadSYan Zheng root_objectid++; 3774c146afadSYan Zheng } 377565d33fd7SQu Wenruo 377665d33fd7SQu Wenruo /* release the uncleaned roots due to error */ 377765d33fd7SQu Wenruo for (; i < ret; i++) { 377865d33fd7SQu Wenruo if (gang[i]) 377965d33fd7SQu Wenruo btrfs_put_fs_root(gang[i]); 378065d33fd7SQu Wenruo } 378165d33fd7SQu Wenruo return err; 3782c146afadSYan Zheng } 3783c146afadSYan Zheng 3784c146afadSYan Zheng int btrfs_commit_super(struct btrfs_root *root) 3785c146afadSYan Zheng { 3786c146afadSYan Zheng struct btrfs_trans_handle *trans; 3787c146afadSYan Zheng 3788c146afadSYan Zheng mutex_lock(&root->fs_info->cleaner_mutex); 378924bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 3790c146afadSYan Zheng mutex_unlock(&root->fs_info->cleaner_mutex); 37919d1a2a3aSDavid Sterba wake_up_process(root->fs_info->cleaner_kthread); 3792c71bf099SYan, Zheng 3793c71bf099SYan, Zheng /* wait until ongoing cleanup work done */ 3794c71bf099SYan, Zheng down_write(&root->fs_info->cleanup_work_sem); 3795c71bf099SYan, Zheng up_write(&root->fs_info->cleanup_work_sem); 3796c71bf099SYan, Zheng 37977a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 37983612b495STsutomu Itoh if (IS_ERR(trans)) 37993612b495STsutomu Itoh return PTR_ERR(trans); 3800d52c1bccSLiu Bo return btrfs_commit_transaction(trans, root); 3801c146afadSYan Zheng } 3802c146afadSYan Zheng 38033abdbd78SDavid Sterba void close_ctree(struct btrfs_root *root) 3804eb60ceacSChris Mason { 38050f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 3806c146afadSYan Zheng int ret; 3807e089f05cSChris Mason 3808facda1e7SChris Mason fs_info->closing = 1; 3809a2135011SChris Mason smp_mb(); 3810a2135011SChris Mason 38117343dd61SJustin Maggard /* wait for the qgroup rescan worker to stop */ 38127343dd61SJustin Maggard btrfs_qgroup_wait_for_completion(fs_info); 38137343dd61SJustin Maggard 3814803b2f54SStefan Behrens /* wait for the uuid_scan task to finish */ 3815803b2f54SStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 3816803b2f54SStefan Behrens /* avoid complains from lockdep et al., set sem back to initial state */ 3817803b2f54SStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 3818803b2f54SStefan Behrens 3819837d5b6eSIlya Dryomov /* pause restriper - we want to resume on mount */ 3820aa1b8cd4SStefan Behrens btrfs_pause_balance(fs_info); 3821837d5b6eSIlya Dryomov 38228dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 38238dabb742SStefan Behrens 3824aa1b8cd4SStefan Behrens btrfs_scrub_cancel(fs_info); 38254cb5300bSChris Mason 38264cb5300bSChris Mason /* wait for any defraggers to finish */ 38274cb5300bSChris Mason wait_event(fs_info->transaction_wait, 38284cb5300bSChris Mason (atomic_read(&fs_info->defrag_running) == 0)); 38294cb5300bSChris Mason 38304cb5300bSChris Mason /* clear out the rbtree of defraggable inodes */ 383126176e7cSMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 38324cb5300bSChris Mason 383321c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 383421c7e756SMiao Xie 3835c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 3836e44163e1SJeff Mahoney /* 3837e44163e1SJeff Mahoney * If the cleaner thread is stopped and there are 3838e44163e1SJeff Mahoney * block groups queued for removal, the deletion will be 3839e44163e1SJeff Mahoney * skipped when we quit the cleaner thread. 3840e44163e1SJeff Mahoney */ 3841e44163e1SJeff Mahoney btrfs_delete_unused_bgs(root->fs_info); 3842e44163e1SJeff Mahoney 3843c146afadSYan Zheng ret = btrfs_commit_super(root); 3844d397712bSChris Mason if (ret) 384504892340SEric Sandeen btrfs_err(fs_info, "commit super ret %d", ret); 3846c146afadSYan Zheng } 3847ed2ff2cbSChris Mason 384887533c47SMiao Xie if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) 384968ce9682SStefan Behrens btrfs_error_commit_super(root); 3850acce952bSliubo 3851e3029d9fSAl Viro kthread_stop(fs_info->transaction_kthread); 3852e3029d9fSAl Viro kthread_stop(fs_info->cleaner_kthread); 38538929ecfaSYan, Zheng 3854f25784b3SYan Zheng fs_info->closing = 2; 3855f25784b3SYan Zheng smp_mb(); 3856f25784b3SYan Zheng 385704892340SEric Sandeen btrfs_free_qgroup_config(fs_info); 3858bcef60f2SArne Jansen 3859963d678bSMiao Xie if (percpu_counter_sum(&fs_info->delalloc_bytes)) { 386004892340SEric Sandeen btrfs_info(fs_info, "at unmount delalloc count %lld", 3861963d678bSMiao Xie percpu_counter_sum(&fs_info->delalloc_bytes)); 3862b0c68f8bSChris Mason } 386331153d81SYan Zheng 38646618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 3865b7c35e81SAnand Jain btrfs_sysfs_remove_fsid(fs_info->fs_devices); 38665ac1d209SJeff Mahoney 3867faa2dbf0SJosef Bacik btrfs_free_fs_roots(fs_info); 3868d10c5f31SChris Mason 38691a4319ccSLiu Bo btrfs_put_block_group_cache(fs_info); 38701a4319ccSLiu Bo 38712b1360daSJosef Bacik btrfs_free_block_groups(fs_info); 38722b1360daSJosef Bacik 3873de348ee0SWang Shilong /* 3874de348ee0SWang Shilong * we must make sure there is not any read request to 3875de348ee0SWang Shilong * submit after we stopping all workers. 3876de348ee0SWang Shilong */ 3877de348ee0SWang Shilong invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 387896192499SJosef Bacik btrfs_stop_all_workers(fs_info); 387996192499SJosef Bacik 388047ab2a6cSJosef Bacik fs_info->open = 0; 388113e6c37bSJosef Bacik free_root_pointers(fs_info, 1); 38829ad6b7bcSChris Mason 388313e6c37bSJosef Bacik iput(fs_info->btree_inode); 3884d6bfde87SChris Mason 388521adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 388621adbd5cSStefan Behrens if (btrfs_test_opt(root, CHECK_INTEGRITY)) 388721adbd5cSStefan Behrens btrfsic_unmount(root, fs_info->fs_devices); 388821adbd5cSStefan Behrens #endif 388921adbd5cSStefan Behrens 3890dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 38910b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 3892b248a415SChris Mason 3893e2d84521SMiao Xie percpu_counter_destroy(&fs_info->dirty_metadata_bytes); 3894963d678bSMiao Xie percpu_counter_destroy(&fs_info->delalloc_bytes); 3895c404e0dcSMiao Xie percpu_counter_destroy(&fs_info->bio_counter); 389604160088SChris Mason bdi_destroy(&fs_info->bdi); 389776dda93cSYan, Zheng cleanup_srcu_struct(&fs_info->subvol_srcu); 38980b86a832SChris Mason 389953b381b3SDavid Woodhouse btrfs_free_stripe_hash_table(fs_info); 390053b381b3SDavid Woodhouse 3901cdfb080eSChris Mason __btrfs_free_block_rsv(root->orphan_block_rsv); 39021cb048f5SFilipe David Borba Manana root->orphan_block_rsv = NULL; 390304216820SFilipe Manana 390404216820SFilipe Manana lock_chunks(root); 390504216820SFilipe Manana while (!list_empty(&fs_info->pinned_chunks)) { 390604216820SFilipe Manana struct extent_map *em; 390704216820SFilipe Manana 390804216820SFilipe Manana em = list_first_entry(&fs_info->pinned_chunks, 390904216820SFilipe Manana struct extent_map, list); 391004216820SFilipe Manana list_del_init(&em->list); 391104216820SFilipe Manana free_extent_map(em); 391204216820SFilipe Manana } 391304216820SFilipe Manana unlock_chunks(root); 3914eb60ceacSChris Mason } 3915eb60ceacSChris Mason 3916b9fab919SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 3917b9fab919SChris Mason int atomic) 3918ccd467d6SChris Mason { 39191259ab75SChris Mason int ret; 3920727011e0SChris Mason struct inode *btree_inode = buf->pages[0]->mapping->host; 39211259ab75SChris Mason 39220b32f4bbSJosef Bacik ret = extent_buffer_uptodate(buf); 39231259ab75SChris Mason if (!ret) 39241259ab75SChris Mason return ret; 39251259ab75SChris Mason 39261259ab75SChris Mason ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, 3927b9fab919SChris Mason parent_transid, atomic); 3928b9fab919SChris Mason if (ret == -EAGAIN) 3929b9fab919SChris Mason return ret; 39301259ab75SChris Mason return !ret; 39315f39d397SChris Mason } 39326702ed49SChris Mason 39335f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 39345f39d397SChris Mason { 39350b32f4bbSJosef Bacik return set_extent_buffer_uptodate(buf); 39365f39d397SChris Mason } 39375f39d397SChris Mason 39385f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 39395f39d397SChris Mason { 394006ea65a3SJosef Bacik struct btrfs_root *root; 39415f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 3942b9473439SChris Mason int was_dirty; 3943b4ce94deSChris Mason 394406ea65a3SJosef Bacik #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 394506ea65a3SJosef Bacik /* 394606ea65a3SJosef Bacik * This is a fast path so only do this check if we have sanity tests 394706ea65a3SJosef Bacik * enabled. Normal people shouldn't be marking dummy buffers as dirty 394806ea65a3SJosef Bacik * outside of the sanity tests. 394906ea65a3SJosef Bacik */ 395006ea65a3SJosef Bacik if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &buf->bflags))) 395106ea65a3SJosef Bacik return; 395206ea65a3SJosef Bacik #endif 395306ea65a3SJosef Bacik root = BTRFS_I(buf->pages[0]->mapping->host)->root; 3954b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 395531b1a2bdSJulia Lawall if (transid != root->fs_info->generation) 395631b1a2bdSJulia Lawall WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, " 3957d397712bSChris Mason "found %llu running %llu\n", 3958c1c9ff7cSGeert Uytterhoeven buf->start, transid, root->fs_info->generation); 39590b32f4bbSJosef Bacik was_dirty = set_extent_buffer_dirty(buf); 3960e2d84521SMiao Xie if (!was_dirty) 3961e2d84521SMiao Xie __percpu_counter_add(&root->fs_info->dirty_metadata_bytes, 3962e2d84521SMiao Xie buf->len, 3963e2d84521SMiao Xie root->fs_info->dirty_metadata_batch); 39641f21ef0aSFilipe Manana #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 39651f21ef0aSFilipe Manana if (btrfs_header_level(buf) == 0 && check_leaf(root, buf)) { 39661f21ef0aSFilipe Manana btrfs_print_leaf(root, buf); 39671f21ef0aSFilipe Manana ASSERT(0); 39681f21ef0aSFilipe Manana } 39691f21ef0aSFilipe Manana #endif 3970eb60ceacSChris Mason } 3971eb60ceacSChris Mason 3972b53d3f5dSLiu Bo static void __btrfs_btree_balance_dirty(struct btrfs_root *root, 3973b53d3f5dSLiu Bo int flush_delayed) 397435b7e476SChris Mason { 3975188de649SChris Mason /* 3976188de649SChris Mason * looks as though older kernels can get into trouble with 3977188de649SChris Mason * this code, they end up stuck in balance_dirty_pages forever 3978188de649SChris Mason */ 3979e2d84521SMiao Xie int ret; 3980d6bfde87SChris Mason 39816933c02eSJens Axboe if (current->flags & PF_MEMALLOC) 3982d6bfde87SChris Mason return; 3983d6bfde87SChris Mason 3984b53d3f5dSLiu Bo if (flush_delayed) 398516cdcec7SMiao Xie btrfs_balance_delayed_items(root); 398616cdcec7SMiao Xie 3987e2d84521SMiao Xie ret = percpu_counter_compare(&root->fs_info->dirty_metadata_bytes, 3988e2d84521SMiao Xie BTRFS_DIRTY_METADATA_THRESH); 3989e2d84521SMiao Xie if (ret > 0) { 3990d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited( 3991d0e1d66bSNamjae Jeon root->fs_info->btree_inode->i_mapping); 399216cdcec7SMiao Xie } 399316cdcec7SMiao Xie return; 399416cdcec7SMiao Xie } 399516cdcec7SMiao Xie 3996b53d3f5dSLiu Bo void btrfs_btree_balance_dirty(struct btrfs_root *root) 399716cdcec7SMiao Xie { 3998b53d3f5dSLiu Bo __btrfs_btree_balance_dirty(root, 1); 399935b7e476SChris Mason } 4000b53d3f5dSLiu Bo 4001b53d3f5dSLiu Bo void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root) 4002b53d3f5dSLiu Bo { 4003b53d3f5dSLiu Bo __btrfs_btree_balance_dirty(root, 0); 4004d6bfde87SChris Mason } 40056b80053dSChris Mason 4006ca7a79adSChris Mason int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 40076b80053dSChris Mason { 4008727011e0SChris Mason struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root; 40090b32f4bbSJosef Bacik return btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 40106b80053dSChris Mason } 40110da5468fSChris Mason 4012fcd1f065SDavid Sterba static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, 4013acce952bSliubo int read_only) 4014acce952bSliubo { 4015c926093eSDavid Sterba struct btrfs_super_block *sb = fs_info->super_copy; 4016c926093eSDavid Sterba int ret = 0; 4017c926093eSDavid Sterba 401821e7626bSDavid Sterba if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) { 401921e7626bSDavid Sterba printk(KERN_ERR "BTRFS: tree_root level too big: %d >= %d\n", 402021e7626bSDavid Sterba btrfs_super_root_level(sb), BTRFS_MAX_LEVEL); 4021c926093eSDavid Sterba ret = -EINVAL; 4022c926093eSDavid Sterba } 402321e7626bSDavid Sterba if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) { 402421e7626bSDavid Sterba printk(KERN_ERR "BTRFS: chunk_root level too big: %d >= %d\n", 402521e7626bSDavid Sterba btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL); 4026c926093eSDavid Sterba ret = -EINVAL; 4027c926093eSDavid Sterba } 402821e7626bSDavid Sterba if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) { 402921e7626bSDavid Sterba printk(KERN_ERR "BTRFS: log_root level too big: %d >= %d\n", 403021e7626bSDavid Sterba btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL); 4031c926093eSDavid Sterba ret = -EINVAL; 4032c926093eSDavid Sterba } 4033c926093eSDavid Sterba 40341104a885SDavid Sterba /* 4035c926093eSDavid Sterba * The common minimum, we don't know if we can trust the nodesize/sectorsize 4036c926093eSDavid Sterba * items yet, they'll be verified later. Issue just a warning. 40371104a885SDavid Sterba */ 403821e7626bSDavid Sterba if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) 4039c926093eSDavid Sterba printk(KERN_WARNING "BTRFS: tree_root block unaligned: %llu\n", 4040cd743facSDavid Sterba btrfs_super_root(sb)); 404121e7626bSDavid Sterba if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) 4042cd743facSDavid Sterba printk(KERN_WARNING "BTRFS: chunk_root block unaligned: %llu\n", 4043cd743facSDavid Sterba btrfs_super_chunk_root(sb)); 404421e7626bSDavid Sterba if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) 4045cd743facSDavid Sterba printk(KERN_WARNING "BTRFS: log_root block unaligned: %llu\n", 404621e7626bSDavid Sterba btrfs_super_log_root(sb)); 4047c926093eSDavid Sterba 404875d6ad38SDavid Sterba /* 404975d6ad38SDavid Sterba * Check the lower bound, the alignment and other constraints are 405075d6ad38SDavid Sterba * checked later. 405175d6ad38SDavid Sterba */ 405275d6ad38SDavid Sterba if (btrfs_super_nodesize(sb) < 4096) { 405375d6ad38SDavid Sterba printk(KERN_ERR "BTRFS: nodesize too small: %u < 4096\n", 405475d6ad38SDavid Sterba btrfs_super_nodesize(sb)); 405575d6ad38SDavid Sterba ret = -EINVAL; 405675d6ad38SDavid Sterba } 405775d6ad38SDavid Sterba if (btrfs_super_sectorsize(sb) < 4096) { 405875d6ad38SDavid Sterba printk(KERN_ERR "BTRFS: sectorsize too small: %u < 4096\n", 405975d6ad38SDavid Sterba btrfs_super_sectorsize(sb)); 406075d6ad38SDavid Sterba ret = -EINVAL; 406175d6ad38SDavid Sterba } 406275d6ad38SDavid Sterba 4063c926093eSDavid Sterba if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) { 4064c926093eSDavid Sterba printk(KERN_ERR "BTRFS: dev_item UUID does not match fsid: %pU != %pU\n", 4065c926093eSDavid Sterba fs_info->fsid, sb->dev_item.fsid); 4066c926093eSDavid Sterba ret = -EINVAL; 4067c926093eSDavid Sterba } 4068c926093eSDavid Sterba 4069c926093eSDavid Sterba /* 4070c926093eSDavid Sterba * Hint to catch really bogus numbers, bitflips or so, more exact checks are 4071c926093eSDavid Sterba * done later 4072c926093eSDavid Sterba */ 407321e7626bSDavid Sterba if (btrfs_super_num_devices(sb) > (1UL << 31)) 4074c926093eSDavid Sterba printk(KERN_WARNING "BTRFS: suspicious number of devices: %llu\n", 407521e7626bSDavid Sterba btrfs_super_num_devices(sb)); 407675d6ad38SDavid Sterba if (btrfs_super_num_devices(sb) == 0) { 407775d6ad38SDavid Sterba printk(KERN_ERR "BTRFS: number of devices is 0\n"); 407875d6ad38SDavid Sterba ret = -EINVAL; 407975d6ad38SDavid Sterba } 4080c926093eSDavid Sterba 408121e7626bSDavid Sterba if (btrfs_super_bytenr(sb) != BTRFS_SUPER_INFO_OFFSET) { 4082c926093eSDavid Sterba printk(KERN_ERR "BTRFS: super offset mismatch %llu != %u\n", 408321e7626bSDavid Sterba btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET); 4084c926093eSDavid Sterba ret = -EINVAL; 4085c926093eSDavid Sterba } 4086c926093eSDavid Sterba 4087c926093eSDavid Sterba /* 4088ce7fca5fSDavid Sterba * Obvious sys_chunk_array corruptions, it must hold at least one key 4089ce7fca5fSDavid Sterba * and one chunk 4090ce7fca5fSDavid Sterba */ 4091ce7fca5fSDavid Sterba if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) { 4092ce7fca5fSDavid Sterba printk(KERN_ERR "BTRFS: system chunk array too big %u > %u\n", 4093ce7fca5fSDavid Sterba btrfs_super_sys_array_size(sb), 4094ce7fca5fSDavid Sterba BTRFS_SYSTEM_CHUNK_ARRAY_SIZE); 4095ce7fca5fSDavid Sterba ret = -EINVAL; 4096ce7fca5fSDavid Sterba } 4097ce7fca5fSDavid Sterba if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key) 4098ce7fca5fSDavid Sterba + sizeof(struct btrfs_chunk)) { 4099d2207129SFabian Frederick printk(KERN_ERR "BTRFS: system chunk array too small %u < %zu\n", 4100ce7fca5fSDavid Sterba btrfs_super_sys_array_size(sb), 4101ce7fca5fSDavid Sterba sizeof(struct btrfs_disk_key) 4102ce7fca5fSDavid Sterba + sizeof(struct btrfs_chunk)); 4103ce7fca5fSDavid Sterba ret = -EINVAL; 4104ce7fca5fSDavid Sterba } 4105ce7fca5fSDavid Sterba 4106ce7fca5fSDavid Sterba /* 4107c926093eSDavid Sterba * The generation is a global counter, we'll trust it more than the others 4108c926093eSDavid Sterba * but it's still possible that it's the one that's wrong. 4109c926093eSDavid Sterba */ 411021e7626bSDavid Sterba if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb)) 4111c926093eSDavid Sterba printk(KERN_WARNING 4112c926093eSDavid Sterba "BTRFS: suspicious: generation < chunk_root_generation: %llu < %llu\n", 411321e7626bSDavid Sterba btrfs_super_generation(sb), btrfs_super_chunk_root_generation(sb)); 411421e7626bSDavid Sterba if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb) 411521e7626bSDavid Sterba && btrfs_super_cache_generation(sb) != (u64)-1) 4116c926093eSDavid Sterba printk(KERN_WARNING 4117c926093eSDavid Sterba "BTRFS: suspicious: generation < cache_generation: %llu < %llu\n", 411821e7626bSDavid Sterba btrfs_super_generation(sb), btrfs_super_cache_generation(sb)); 4119c926093eSDavid Sterba 4120c926093eSDavid Sterba return ret; 4121fcd1f065SDavid Sterba } 4122fcd1f065SDavid Sterba 412348a3b636SEric Sandeen static void btrfs_error_commit_super(struct btrfs_root *root) 4124acce952bSliubo { 4125acce952bSliubo mutex_lock(&root->fs_info->cleaner_mutex); 4126acce952bSliubo btrfs_run_delayed_iputs(root); 4127acce952bSliubo mutex_unlock(&root->fs_info->cleaner_mutex); 4128acce952bSliubo 4129acce952bSliubo down_write(&root->fs_info->cleanup_work_sem); 4130acce952bSliubo up_write(&root->fs_info->cleanup_work_sem); 4131acce952bSliubo 4132acce952bSliubo /* cleanup FS via transaction */ 4133acce952bSliubo btrfs_cleanup_transaction(root); 4134acce952bSliubo } 4135acce952bSliubo 4136143bede5SJeff Mahoney static void btrfs_destroy_ordered_extents(struct btrfs_root *root) 4137acce952bSliubo { 4138acce952bSliubo struct btrfs_ordered_extent *ordered; 4139acce952bSliubo 4140199c2a9cSMiao Xie spin_lock(&root->ordered_extent_lock); 4141779880efSJosef Bacik /* 4142779880efSJosef Bacik * This will just short circuit the ordered completion stuff which will 4143779880efSJosef Bacik * make sure the ordered extent gets properly cleaned up. 4144779880efSJosef Bacik */ 4145199c2a9cSMiao Xie list_for_each_entry(ordered, &root->ordered_extents, 4146779880efSJosef Bacik root_extent_list) 4147779880efSJosef Bacik set_bit(BTRFS_ORDERED_IOERR, &ordered->flags); 4148199c2a9cSMiao Xie spin_unlock(&root->ordered_extent_lock); 4149199c2a9cSMiao Xie } 4150199c2a9cSMiao Xie 4151199c2a9cSMiao Xie static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info) 4152199c2a9cSMiao Xie { 4153199c2a9cSMiao Xie struct btrfs_root *root; 4154199c2a9cSMiao Xie struct list_head splice; 4155199c2a9cSMiao Xie 4156199c2a9cSMiao Xie INIT_LIST_HEAD(&splice); 4157199c2a9cSMiao Xie 4158199c2a9cSMiao Xie spin_lock(&fs_info->ordered_root_lock); 4159199c2a9cSMiao Xie list_splice_init(&fs_info->ordered_roots, &splice); 4160199c2a9cSMiao Xie while (!list_empty(&splice)) { 4161199c2a9cSMiao Xie root = list_first_entry(&splice, struct btrfs_root, 4162199c2a9cSMiao Xie ordered_root); 41631de2cfdeSJosef Bacik list_move_tail(&root->ordered_root, 41641de2cfdeSJosef Bacik &fs_info->ordered_roots); 4165199c2a9cSMiao Xie 41662a85d9caSLiu Bo spin_unlock(&fs_info->ordered_root_lock); 4167199c2a9cSMiao Xie btrfs_destroy_ordered_extents(root); 4168199c2a9cSMiao Xie 41692a85d9caSLiu Bo cond_resched(); 41702a85d9caSLiu Bo spin_lock(&fs_info->ordered_root_lock); 4171199c2a9cSMiao Xie } 4172199c2a9cSMiao Xie spin_unlock(&fs_info->ordered_root_lock); 4173acce952bSliubo } 4174acce952bSliubo 417535a3621bSStefan Behrens static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, 4176acce952bSliubo struct btrfs_root *root) 4177acce952bSliubo { 4178acce952bSliubo struct rb_node *node; 4179acce952bSliubo struct btrfs_delayed_ref_root *delayed_refs; 4180acce952bSliubo struct btrfs_delayed_ref_node *ref; 4181acce952bSliubo int ret = 0; 4182acce952bSliubo 4183acce952bSliubo delayed_refs = &trans->delayed_refs; 4184acce952bSliubo 4185acce952bSliubo spin_lock(&delayed_refs->lock); 4186d7df2c79SJosef Bacik if (atomic_read(&delayed_refs->num_entries) == 0) { 4187cfece4dbSDavid Sterba spin_unlock(&delayed_refs->lock); 4188efe120a0SFrank Holton btrfs_info(root->fs_info, "delayed_refs has NO entry"); 4189acce952bSliubo return ret; 4190acce952bSliubo } 4191acce952bSliubo 4192d7df2c79SJosef Bacik while ((node = rb_first(&delayed_refs->href_root)) != NULL) { 4193d7df2c79SJosef Bacik struct btrfs_delayed_ref_head *head; 4194c6fc2454SQu Wenruo struct btrfs_delayed_ref_node *tmp; 4195e78417d1SJosef Bacik bool pin_bytes = false; 4196acce952bSliubo 4197d7df2c79SJosef Bacik head = rb_entry(node, struct btrfs_delayed_ref_head, 4198d7df2c79SJosef Bacik href_node); 4199b939d1abSJosef Bacik if (!mutex_trylock(&head->mutex)) { 4200d7df2c79SJosef Bacik atomic_inc(&head->node.refs); 420179787eaaSJeff Mahoney spin_unlock(&delayed_refs->lock); 4202b939d1abSJosef Bacik 4203acce952bSliubo mutex_lock(&head->mutex); 4204b939d1abSJosef Bacik mutex_unlock(&head->mutex); 4205d7df2c79SJosef Bacik btrfs_put_delayed_ref(&head->node); 4206e18fca73SJosef Bacik spin_lock(&delayed_refs->lock); 4207b939d1abSJosef Bacik continue; 4208b939d1abSJosef Bacik } 4209d7df2c79SJosef Bacik spin_lock(&head->lock); 4210c6fc2454SQu Wenruo list_for_each_entry_safe_reverse(ref, tmp, &head->ref_list, 4211c6fc2454SQu Wenruo list) { 4212d7df2c79SJosef Bacik ref->in_tree = 0; 4213c6fc2454SQu Wenruo list_del(&ref->list); 4214d7df2c79SJosef Bacik atomic_dec(&delayed_refs->num_entries); 4215d7df2c79SJosef Bacik btrfs_put_delayed_ref(ref); 4216d7df2c79SJosef Bacik } 421754067ae9SJosef Bacik if (head->must_insert_reserved) 4218e78417d1SJosef Bacik pin_bytes = true; 421978a6184aSMiao Xie btrfs_free_delayed_extent_op(head->extent_op); 4220acce952bSliubo delayed_refs->num_heads--; 4221d7df2c79SJosef Bacik if (head->processing == 0) 4222acce952bSliubo delayed_refs->num_heads_ready--; 4223d7df2c79SJosef Bacik atomic_dec(&delayed_refs->num_entries); 4224d7df2c79SJosef Bacik head->node.in_tree = 0; 4225c46effa6SLiu Bo rb_erase(&head->href_node, &delayed_refs->href_root); 4226d7df2c79SJosef Bacik spin_unlock(&head->lock); 4227acce952bSliubo spin_unlock(&delayed_refs->lock); 4228e78417d1SJosef Bacik mutex_unlock(&head->mutex); 4229acce952bSliubo 4230d7df2c79SJosef Bacik if (pin_bytes) 4231d7df2c79SJosef Bacik btrfs_pin_extent(root, head->node.bytenr, 4232d7df2c79SJosef Bacik head->node.num_bytes, 1); 4233d7df2c79SJosef Bacik btrfs_put_delayed_ref(&head->node); 4234acce952bSliubo cond_resched(); 4235acce952bSliubo spin_lock(&delayed_refs->lock); 4236acce952bSliubo } 4237acce952bSliubo 4238acce952bSliubo spin_unlock(&delayed_refs->lock); 4239acce952bSliubo 4240acce952bSliubo return ret; 4241acce952bSliubo } 4242acce952bSliubo 4243143bede5SJeff Mahoney static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root) 4244acce952bSliubo { 4245acce952bSliubo struct btrfs_inode *btrfs_inode; 4246acce952bSliubo struct list_head splice; 4247acce952bSliubo 4248acce952bSliubo INIT_LIST_HEAD(&splice); 4249acce952bSliubo 4250eb73c1b7SMiao Xie spin_lock(&root->delalloc_lock); 4251eb73c1b7SMiao Xie list_splice_init(&root->delalloc_inodes, &splice); 4252acce952bSliubo 4253acce952bSliubo while (!list_empty(&splice)) { 4254eb73c1b7SMiao Xie btrfs_inode = list_first_entry(&splice, struct btrfs_inode, 4255acce952bSliubo delalloc_inodes); 4256acce952bSliubo 4257acce952bSliubo list_del_init(&btrfs_inode->delalloc_inodes); 4258df0af1a5SMiao Xie clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, 4259df0af1a5SMiao Xie &btrfs_inode->runtime_flags); 4260eb73c1b7SMiao Xie spin_unlock(&root->delalloc_lock); 4261acce952bSliubo 4262acce952bSliubo btrfs_invalidate_inodes(btrfs_inode->root); 4263b216cbfbSMiao Xie 4264eb73c1b7SMiao Xie spin_lock(&root->delalloc_lock); 4265acce952bSliubo } 4266acce952bSliubo 4267eb73c1b7SMiao Xie spin_unlock(&root->delalloc_lock); 4268eb73c1b7SMiao Xie } 4269eb73c1b7SMiao Xie 4270eb73c1b7SMiao Xie static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info) 4271eb73c1b7SMiao Xie { 4272eb73c1b7SMiao Xie struct btrfs_root *root; 4273eb73c1b7SMiao Xie struct list_head splice; 4274eb73c1b7SMiao Xie 4275eb73c1b7SMiao Xie INIT_LIST_HEAD(&splice); 4276eb73c1b7SMiao Xie 4277eb73c1b7SMiao Xie spin_lock(&fs_info->delalloc_root_lock); 4278eb73c1b7SMiao Xie list_splice_init(&fs_info->delalloc_roots, &splice); 4279eb73c1b7SMiao Xie while (!list_empty(&splice)) { 4280eb73c1b7SMiao Xie root = list_first_entry(&splice, struct btrfs_root, 4281eb73c1b7SMiao Xie delalloc_root); 4282eb73c1b7SMiao Xie list_del_init(&root->delalloc_root); 4283eb73c1b7SMiao Xie root = btrfs_grab_fs_root(root); 4284eb73c1b7SMiao Xie BUG_ON(!root); 4285eb73c1b7SMiao Xie spin_unlock(&fs_info->delalloc_root_lock); 4286eb73c1b7SMiao Xie 4287eb73c1b7SMiao Xie btrfs_destroy_delalloc_inodes(root); 4288eb73c1b7SMiao Xie btrfs_put_fs_root(root); 4289eb73c1b7SMiao Xie 4290eb73c1b7SMiao Xie spin_lock(&fs_info->delalloc_root_lock); 4291eb73c1b7SMiao Xie } 4292eb73c1b7SMiao Xie spin_unlock(&fs_info->delalloc_root_lock); 4293acce952bSliubo } 4294acce952bSliubo 4295acce952bSliubo static int btrfs_destroy_marked_extents(struct btrfs_root *root, 4296acce952bSliubo struct extent_io_tree *dirty_pages, 4297acce952bSliubo int mark) 4298acce952bSliubo { 4299acce952bSliubo int ret; 4300acce952bSliubo struct extent_buffer *eb; 4301acce952bSliubo u64 start = 0; 4302acce952bSliubo u64 end; 4303acce952bSliubo 4304acce952bSliubo while (1) { 4305acce952bSliubo ret = find_first_extent_bit(dirty_pages, start, &start, &end, 4306e6138876SJosef Bacik mark, NULL); 4307acce952bSliubo if (ret) 4308acce952bSliubo break; 4309acce952bSliubo 4310acce952bSliubo clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); 4311acce952bSliubo while (start <= end) { 431201d58472SDaniel Dressler eb = btrfs_find_tree_block(root->fs_info, start); 4313707e8a07SDavid Sterba start += root->nodesize; 4314fd8b2b61SJosef Bacik if (!eb) 4315acce952bSliubo continue; 4316fd8b2b61SJosef Bacik wait_on_extent_buffer_writeback(eb); 4317acce952bSliubo 4318fd8b2b61SJosef Bacik if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, 4319fd8b2b61SJosef Bacik &eb->bflags)) 4320fd8b2b61SJosef Bacik clear_extent_buffer_dirty(eb); 4321fd8b2b61SJosef Bacik free_extent_buffer_stale(eb); 4322acce952bSliubo } 4323acce952bSliubo } 4324acce952bSliubo 4325acce952bSliubo return ret; 4326acce952bSliubo } 4327acce952bSliubo 4328acce952bSliubo static int btrfs_destroy_pinned_extent(struct btrfs_root *root, 4329acce952bSliubo struct extent_io_tree *pinned_extents) 4330acce952bSliubo { 4331acce952bSliubo struct extent_io_tree *unpin; 4332acce952bSliubo u64 start; 4333acce952bSliubo u64 end; 4334acce952bSliubo int ret; 4335ed0eaa14SLiu Bo bool loop = true; 4336acce952bSliubo 4337acce952bSliubo unpin = pinned_extents; 4338ed0eaa14SLiu Bo again: 4339acce952bSliubo while (1) { 4340acce952bSliubo ret = find_first_extent_bit(unpin, 0, &start, &end, 4341e6138876SJosef Bacik EXTENT_DIRTY, NULL); 4342acce952bSliubo if (ret) 4343acce952bSliubo break; 4344acce952bSliubo 4345acce952bSliubo clear_extent_dirty(unpin, start, end, GFP_NOFS); 4346acce952bSliubo btrfs_error_unpin_extent_range(root, start, end); 4347acce952bSliubo cond_resched(); 4348acce952bSliubo } 4349acce952bSliubo 4350ed0eaa14SLiu Bo if (loop) { 4351ed0eaa14SLiu Bo if (unpin == &root->fs_info->freed_extents[0]) 4352ed0eaa14SLiu Bo unpin = &root->fs_info->freed_extents[1]; 4353ed0eaa14SLiu Bo else 4354ed0eaa14SLiu Bo unpin = &root->fs_info->freed_extents[0]; 4355ed0eaa14SLiu Bo loop = false; 4356ed0eaa14SLiu Bo goto again; 4357ed0eaa14SLiu Bo } 4358ed0eaa14SLiu Bo 4359acce952bSliubo return 0; 4360acce952bSliubo } 4361acce952bSliubo 436249b25e05SJeff Mahoney void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans, 436349b25e05SJeff Mahoney struct btrfs_root *root) 436449b25e05SJeff Mahoney { 436549b25e05SJeff Mahoney btrfs_destroy_delayed_refs(cur_trans, root); 436649b25e05SJeff Mahoney 43674a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_COMMIT_START; 436849b25e05SJeff Mahoney wake_up(&root->fs_info->transaction_blocked_wait); 436949b25e05SJeff Mahoney 43704a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_UNBLOCKED; 437149b25e05SJeff Mahoney wake_up(&root->fs_info->transaction_wait); 437249b25e05SJeff Mahoney 437367cde344SMiao Xie btrfs_destroy_delayed_inodes(root); 437467cde344SMiao Xie btrfs_assert_delayed_root_empty(root); 437567cde344SMiao Xie 437649b25e05SJeff Mahoney btrfs_destroy_marked_extents(root, &cur_trans->dirty_pages, 437749b25e05SJeff Mahoney EXTENT_DIRTY); 43786e841e32SLiu Bo btrfs_destroy_pinned_extent(root, 43796e841e32SLiu Bo root->fs_info->pinned_extents); 438049b25e05SJeff Mahoney 43814a9d8bdeSMiao Xie cur_trans->state =TRANS_STATE_COMPLETED; 43824a9d8bdeSMiao Xie wake_up(&cur_trans->commit_wait); 43834a9d8bdeSMiao Xie 438449b25e05SJeff Mahoney /* 438549b25e05SJeff Mahoney memset(cur_trans, 0, sizeof(*cur_trans)); 438649b25e05SJeff Mahoney kmem_cache_free(btrfs_transaction_cachep, cur_trans); 438749b25e05SJeff Mahoney */ 438849b25e05SJeff Mahoney } 438949b25e05SJeff Mahoney 439048a3b636SEric Sandeen static int btrfs_cleanup_transaction(struct btrfs_root *root) 4391acce952bSliubo { 4392acce952bSliubo struct btrfs_transaction *t; 4393acce952bSliubo 4394acce952bSliubo mutex_lock(&root->fs_info->transaction_kthread_mutex); 4395acce952bSliubo 4396a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 4397724e2315SJosef Bacik while (!list_empty(&root->fs_info->trans_list)) { 4398724e2315SJosef Bacik t = list_first_entry(&root->fs_info->trans_list, 4399724e2315SJosef Bacik struct btrfs_transaction, list); 4400724e2315SJosef Bacik if (t->state >= TRANS_STATE_COMMIT_START) { 4401724e2315SJosef Bacik atomic_inc(&t->use_count); 4402724e2315SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4403724e2315SJosef Bacik btrfs_wait_for_commit(root, t->transid); 4404724e2315SJosef Bacik btrfs_put_transaction(t); 4405724e2315SJosef Bacik spin_lock(&root->fs_info->trans_lock); 4406724e2315SJosef Bacik continue; 4407724e2315SJosef Bacik } 4408724e2315SJosef Bacik if (t == root->fs_info->running_transaction) { 4409724e2315SJosef Bacik t->state = TRANS_STATE_COMMIT_DOING; 4410724e2315SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4411724e2315SJosef Bacik /* 4412724e2315SJosef Bacik * We wait for 0 num_writers since we don't hold a trans 4413724e2315SJosef Bacik * handle open currently for this transaction. 4414724e2315SJosef Bacik */ 4415724e2315SJosef Bacik wait_event(t->writer_wait, 4416724e2315SJosef Bacik atomic_read(&t->num_writers) == 0); 4417724e2315SJosef Bacik } else { 4418724e2315SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4419724e2315SJosef Bacik } 4420724e2315SJosef Bacik btrfs_cleanup_one_transaction(t, root); 4421724e2315SJosef Bacik 4422724e2315SJosef Bacik spin_lock(&root->fs_info->trans_lock); 4423724e2315SJosef Bacik if (t == root->fs_info->running_transaction) 4424ac673879SMiao Xie root->fs_info->running_transaction = NULL; 4425724e2315SJosef Bacik list_del_init(&t->list); 4426a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4427a4abeea4SJosef Bacik 4428724e2315SJosef Bacik btrfs_put_transaction(t); 4429724e2315SJosef Bacik trace_btrfs_transaction_commit(root); 4430724e2315SJosef Bacik spin_lock(&root->fs_info->trans_lock); 4431724e2315SJosef Bacik } 4432724e2315SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 4433199c2a9cSMiao Xie btrfs_destroy_all_ordered_extents(root->fs_info); 443467cde344SMiao Xie btrfs_destroy_delayed_inodes(root); 443567cde344SMiao Xie btrfs_assert_delayed_root_empty(root); 4436724e2315SJosef Bacik btrfs_destroy_pinned_extent(root, root->fs_info->pinned_extents); 4437eb73c1b7SMiao Xie btrfs_destroy_all_delalloc_inodes(root->fs_info); 4438acce952bSliubo mutex_unlock(&root->fs_info->transaction_kthread_mutex); 4439acce952bSliubo 4440acce952bSliubo return 0; 4441acce952bSliubo } 4442acce952bSliubo 4443e8c9f186SDavid Sterba static const struct extent_io_ops btree_extent_io_ops = { 4444ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 44454bb31e92SArne Jansen .readpage_io_failed_hook = btree_io_failed_hook, 44460b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 4447239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 4448239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 44490da5468fSChris Mason }; 4450