16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 19e20d96d6SChris Mason #include <linux/fs.h> 20d98237b3SChris Mason #include <linux/blkdev.h> 2187cbda5cSChris Mason #include <linux/scatterlist.h> 2222b0ebdaSChris Mason #include <linux/swap.h> 230f7d52f4SChris Mason #include <linux/radix-tree.h> 2435b7e476SChris Mason #include <linux/writeback.h> 25d397712bSChris Mason #include <linux/buffer_head.h> 26ce9adaa5SChris Mason #include <linux/workqueue.h> 27a74a4b97SChris Mason #include <linux/kthread.h> 28a74a4b97SChris Mason #include <linux/freezer.h> 29163e783eSDavid Woodhouse #include <linux/crc32c.h> 304b4e25f2SChris Mason #include "compat.h" 31eb60ceacSChris Mason #include "ctree.h" 32eb60ceacSChris Mason #include "disk-io.h" 33e089f05cSChris Mason #include "transaction.h" 340f7d52f4SChris Mason #include "btrfs_inode.h" 350b86a832SChris Mason #include "volumes.h" 36db94535dSChris Mason #include "print-tree.h" 378b712842SChris Mason #include "async-thread.h" 38925baeddSChris Mason #include "locking.h" 39e02119d5SChris Mason #include "tree-log.h" 40fa9c0d79SChris Mason #include "free-space-cache.h" 41eb60ceacSChris Mason 42d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops; 438b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work); 444df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root); 45ce9adaa5SChris Mason 46ad081f14SJens Axboe static atomic_t btrfs_bdi_num = ATOMIC_INIT(0); 47ad081f14SJens Axboe 48d352ac68SChris Mason /* 49d352ac68SChris Mason * end_io_wq structs are used to do processing in task context when an IO is 50d352ac68SChris Mason * complete. This is used during reads to verify checksums, and it is used 51d352ac68SChris Mason * by writes to insert metadata for new file extents after IO is complete. 52d352ac68SChris Mason */ 53ce9adaa5SChris Mason struct end_io_wq { 54ce9adaa5SChris Mason struct bio *bio; 55ce9adaa5SChris Mason bio_end_io_t *end_io; 56ce9adaa5SChris Mason void *private; 57ce9adaa5SChris Mason struct btrfs_fs_info *info; 58ce9adaa5SChris Mason int error; 5922c59948SChris Mason int metadata; 60ce9adaa5SChris Mason struct list_head list; 618b712842SChris Mason struct btrfs_work work; 62ce9adaa5SChris Mason }; 630da5468fSChris Mason 64d352ac68SChris Mason /* 65d352ac68SChris Mason * async submit bios are used to offload expensive checksumming 66d352ac68SChris Mason * onto the worker threads. They checksum file and metadata bios 67d352ac68SChris Mason * just before they are sent down the IO stack. 68d352ac68SChris Mason */ 6944b8bd7eSChris Mason struct async_submit_bio { 7044b8bd7eSChris Mason struct inode *inode; 7144b8bd7eSChris Mason struct bio *bio; 7244b8bd7eSChris Mason struct list_head list; 734a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start; 744a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done; 7544b8bd7eSChris Mason int rw; 7644b8bd7eSChris Mason int mirror_num; 77c8b97818SChris Mason unsigned long bio_flags; 788b712842SChris Mason struct btrfs_work work; 7944b8bd7eSChris Mason }; 8044b8bd7eSChris Mason 814008c04aSChris Mason /* These are used to set the lockdep class on the extent buffer locks. 824008c04aSChris Mason * The class is set by the readpage_end_io_hook after the buffer has 834008c04aSChris Mason * passed csum validation but before the pages are unlocked. 844008c04aSChris Mason * 854008c04aSChris Mason * The lockdep class is also set by btrfs_init_new_buffer on freshly 864008c04aSChris Mason * allocated blocks. 874008c04aSChris Mason * 884008c04aSChris Mason * The class is based on the level in the tree block, which allows lockdep 894008c04aSChris Mason * to know that lower nodes nest inside the locks of higher nodes. 904008c04aSChris Mason * 914008c04aSChris Mason * We also add a check to make sure the highest level of the tree is 924008c04aSChris Mason * the same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this 934008c04aSChris Mason * code needs update as well. 944008c04aSChris Mason */ 954008c04aSChris Mason #ifdef CONFIG_DEBUG_LOCK_ALLOC 964008c04aSChris Mason # if BTRFS_MAX_LEVEL != 8 974008c04aSChris Mason # error 984008c04aSChris Mason # endif 994008c04aSChris Mason static struct lock_class_key btrfs_eb_class[BTRFS_MAX_LEVEL + 1]; 1004008c04aSChris Mason static const char *btrfs_eb_name[BTRFS_MAX_LEVEL + 1] = { 1014008c04aSChris Mason /* leaf */ 1024008c04aSChris Mason "btrfs-extent-00", 1034008c04aSChris Mason "btrfs-extent-01", 1044008c04aSChris Mason "btrfs-extent-02", 1054008c04aSChris Mason "btrfs-extent-03", 1064008c04aSChris Mason "btrfs-extent-04", 1074008c04aSChris Mason "btrfs-extent-05", 1084008c04aSChris Mason "btrfs-extent-06", 1094008c04aSChris Mason "btrfs-extent-07", 1104008c04aSChris Mason /* highest possible level */ 1114008c04aSChris Mason "btrfs-extent-08", 1124008c04aSChris Mason }; 1134008c04aSChris Mason #endif 1144008c04aSChris Mason 115d352ac68SChris Mason /* 116d352ac68SChris Mason * extents on the btree inode are pretty simple, there's one extent 117d352ac68SChris Mason * that covers the entire device 118d352ac68SChris Mason */ 119b2950863SChristoph Hellwig static struct extent_map *btree_get_extent(struct inode *inode, 120b2950863SChristoph Hellwig struct page *page, size_t page_offset, u64 start, u64 len, 1215f39d397SChris Mason int create) 1225f39d397SChris Mason { 1235f39d397SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1245f39d397SChris Mason struct extent_map *em; 1255f39d397SChris Mason int ret; 1265f39d397SChris Mason 127890871beSChris Mason read_lock(&em_tree->lock); 128d1310b2eSChris Mason em = lookup_extent_mapping(em_tree, start, len); 129a061fc8dSChris Mason if (em) { 130a061fc8dSChris Mason em->bdev = 131a061fc8dSChris Mason BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 132890871beSChris Mason read_unlock(&em_tree->lock); 1335f39d397SChris Mason goto out; 134a061fc8dSChris Mason } 135890871beSChris Mason read_unlock(&em_tree->lock); 1367b13b7b1SChris Mason 1375f39d397SChris Mason em = alloc_extent_map(GFP_NOFS); 1385f39d397SChris Mason if (!em) { 1395f39d397SChris Mason em = ERR_PTR(-ENOMEM); 1405f39d397SChris Mason goto out; 1415f39d397SChris Mason } 1425f39d397SChris Mason em->start = 0; 1430afbaf8cSChris Mason em->len = (u64)-1; 144c8b97818SChris Mason em->block_len = (u64)-1; 1455f39d397SChris Mason em->block_start = 0; 146a061fc8dSChris Mason em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 147d1310b2eSChris Mason 148890871beSChris Mason write_lock(&em_tree->lock); 1495f39d397SChris Mason ret = add_extent_mapping(em_tree, em); 1505f39d397SChris Mason if (ret == -EEXIST) { 1510afbaf8cSChris Mason u64 failed_start = em->start; 1520afbaf8cSChris Mason u64 failed_len = em->len; 1530afbaf8cSChris Mason 1545f39d397SChris Mason free_extent_map(em); 1557b13b7b1SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1560afbaf8cSChris Mason if (em) { 1577b13b7b1SChris Mason ret = 0; 1580afbaf8cSChris Mason } else { 1590afbaf8cSChris Mason em = lookup_extent_mapping(em_tree, failed_start, 1600afbaf8cSChris Mason failed_len); 1617b13b7b1SChris Mason ret = -EIO; 1620afbaf8cSChris Mason } 1635f39d397SChris Mason } else if (ret) { 1647b13b7b1SChris Mason free_extent_map(em); 1657b13b7b1SChris Mason em = NULL; 1665f39d397SChris Mason } 167890871beSChris Mason write_unlock(&em_tree->lock); 1687b13b7b1SChris Mason 1697b13b7b1SChris Mason if (ret) 1707b13b7b1SChris Mason em = ERR_PTR(ret); 1715f39d397SChris Mason out: 1725f39d397SChris Mason return em; 1735f39d397SChris Mason } 1745f39d397SChris Mason 17519c00ddcSChris Mason u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) 17619c00ddcSChris Mason { 177163e783eSDavid Woodhouse return crc32c(seed, data, len); 17819c00ddcSChris Mason } 17919c00ddcSChris Mason 18019c00ddcSChris Mason void btrfs_csum_final(u32 crc, char *result) 18119c00ddcSChris Mason { 18219c00ddcSChris Mason *(__le32 *)result = ~cpu_to_le32(crc); 18319c00ddcSChris Mason } 18419c00ddcSChris Mason 185d352ac68SChris Mason /* 186d352ac68SChris Mason * compute the csum for a btree block, and either verify it or write it 187d352ac68SChris Mason * into the csum field of the block. 188d352ac68SChris Mason */ 18919c00ddcSChris Mason static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, 19019c00ddcSChris Mason int verify) 19119c00ddcSChris Mason { 192607d432dSJosef Bacik u16 csum_size = 193607d432dSJosef Bacik btrfs_super_csum_size(&root->fs_info->super_copy); 194607d432dSJosef Bacik char *result = NULL; 19519c00ddcSChris Mason unsigned long len; 19619c00ddcSChris Mason unsigned long cur_len; 19719c00ddcSChris Mason unsigned long offset = BTRFS_CSUM_SIZE; 19819c00ddcSChris Mason char *map_token = NULL; 19919c00ddcSChris Mason char *kaddr; 20019c00ddcSChris Mason unsigned long map_start; 20119c00ddcSChris Mason unsigned long map_len; 20219c00ddcSChris Mason int err; 20319c00ddcSChris Mason u32 crc = ~(u32)0; 204607d432dSJosef Bacik unsigned long inline_result; 20519c00ddcSChris Mason 20619c00ddcSChris Mason len = buf->len - offset; 20719c00ddcSChris Mason while (len > 0) { 20819c00ddcSChris Mason err = map_private_extent_buffer(buf, offset, 32, 20919c00ddcSChris Mason &map_token, &kaddr, 21019c00ddcSChris Mason &map_start, &map_len, KM_USER0); 211d397712bSChris Mason if (err) 21219c00ddcSChris Mason return 1; 21319c00ddcSChris Mason cur_len = min(len, map_len - (offset - map_start)); 21419c00ddcSChris Mason crc = btrfs_csum_data(root, kaddr + offset - map_start, 21519c00ddcSChris Mason crc, cur_len); 21619c00ddcSChris Mason len -= cur_len; 21719c00ddcSChris Mason offset += cur_len; 21819c00ddcSChris Mason unmap_extent_buffer(buf, map_token, KM_USER0); 21919c00ddcSChris Mason } 220607d432dSJosef Bacik if (csum_size > sizeof(inline_result)) { 221607d432dSJosef Bacik result = kzalloc(csum_size * sizeof(char), GFP_NOFS); 222607d432dSJosef Bacik if (!result) 223607d432dSJosef Bacik return 1; 224607d432dSJosef Bacik } else { 225607d432dSJosef Bacik result = (char *)&inline_result; 226607d432dSJosef Bacik } 227607d432dSJosef Bacik 22819c00ddcSChris Mason btrfs_csum_final(crc, result); 22919c00ddcSChris Mason 23019c00ddcSChris Mason if (verify) { 231607d432dSJosef Bacik if (memcmp_extent_buffer(buf, result, 0, csum_size)) { 232e4204dedSChris Mason u32 val; 233e4204dedSChris Mason u32 found = 0; 234607d432dSJosef Bacik memcpy(&found, result, csum_size); 235e4204dedSChris Mason 236607d432dSJosef Bacik read_extent_buffer(buf, &val, 0, csum_size); 237193f284dSChris Mason if (printk_ratelimit()) { 238193f284dSChris Mason printk(KERN_INFO "btrfs: %s checksum verify " 239193f284dSChris Mason "failed on %llu wanted %X found %X " 240193f284dSChris Mason "level %d\n", 24119c00ddcSChris Mason root->fs_info->sb->s_id, 242193f284dSChris Mason (unsigned long long)buf->start, val, found, 243193f284dSChris Mason btrfs_header_level(buf)); 244193f284dSChris Mason } 245607d432dSJosef Bacik if (result != (char *)&inline_result) 246607d432dSJosef Bacik kfree(result); 24719c00ddcSChris Mason return 1; 24819c00ddcSChris Mason } 24919c00ddcSChris Mason } else { 250607d432dSJosef Bacik write_extent_buffer(buf, result, 0, csum_size); 25119c00ddcSChris Mason } 252607d432dSJosef Bacik if (result != (char *)&inline_result) 253607d432dSJosef Bacik kfree(result); 25419c00ddcSChris Mason return 0; 25519c00ddcSChris Mason } 25619c00ddcSChris Mason 257d352ac68SChris Mason /* 258d352ac68SChris Mason * we can't consider a given block up to date unless the transid of the 259d352ac68SChris Mason * block matches the transid in the parent node's pointer. This is how we 260d352ac68SChris Mason * detect blocks that either didn't get written at all or got written 261d352ac68SChris Mason * in the wrong place. 262d352ac68SChris Mason */ 2631259ab75SChris Mason static int verify_parent_transid(struct extent_io_tree *io_tree, 2641259ab75SChris Mason struct extent_buffer *eb, u64 parent_transid) 2651259ab75SChris Mason { 2661259ab75SChris Mason int ret; 2671259ab75SChris Mason 2681259ab75SChris Mason if (!parent_transid || btrfs_header_generation(eb) == parent_transid) 2691259ab75SChris Mason return 0; 2701259ab75SChris Mason 2711259ab75SChris Mason lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS); 2721259ab75SChris Mason if (extent_buffer_uptodate(io_tree, eb) && 2731259ab75SChris Mason btrfs_header_generation(eb) == parent_transid) { 2741259ab75SChris Mason ret = 0; 2751259ab75SChris Mason goto out; 2761259ab75SChris Mason } 277193f284dSChris Mason if (printk_ratelimit()) { 278193f284dSChris Mason printk("parent transid verify failed on %llu wanted %llu " 279193f284dSChris Mason "found %llu\n", 2801259ab75SChris Mason (unsigned long long)eb->start, 2811259ab75SChris Mason (unsigned long long)parent_transid, 2821259ab75SChris Mason (unsigned long long)btrfs_header_generation(eb)); 283193f284dSChris Mason } 2841259ab75SChris Mason ret = 1; 2851259ab75SChris Mason clear_extent_buffer_uptodate(io_tree, eb); 28633958dc6SChris Mason out: 2871259ab75SChris Mason unlock_extent(io_tree, eb->start, eb->start + eb->len - 1, 2881259ab75SChris Mason GFP_NOFS); 2891259ab75SChris Mason return ret; 2901259ab75SChris Mason } 2911259ab75SChris Mason 292d352ac68SChris Mason /* 293d352ac68SChris Mason * helper to read a given tree block, doing retries as required when 294d352ac68SChris Mason * the checksums don't match and we have alternate mirrors to try. 295d352ac68SChris Mason */ 296f188591eSChris Mason static int btree_read_extent_buffer_pages(struct btrfs_root *root, 297f188591eSChris Mason struct extent_buffer *eb, 298ca7a79adSChris Mason u64 start, u64 parent_transid) 299f188591eSChris Mason { 300f188591eSChris Mason struct extent_io_tree *io_tree; 301f188591eSChris Mason int ret; 302f188591eSChris Mason int num_copies = 0; 303f188591eSChris Mason int mirror_num = 0; 304f188591eSChris Mason 305f188591eSChris Mason io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 306f188591eSChris Mason while (1) { 307f188591eSChris Mason ret = read_extent_buffer_pages(io_tree, eb, start, 1, 308f188591eSChris Mason btree_get_extent, mirror_num); 3091259ab75SChris Mason if (!ret && 3101259ab75SChris Mason !verify_parent_transid(io_tree, eb, parent_transid)) 311f188591eSChris Mason return ret; 312d397712bSChris Mason 313f188591eSChris Mason num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, 314f188591eSChris Mason eb->start, eb->len); 3154235298eSChris Mason if (num_copies == 1) 316f188591eSChris Mason return ret; 3174235298eSChris Mason 318f188591eSChris Mason mirror_num++; 3194235298eSChris Mason if (mirror_num > num_copies) 320f188591eSChris Mason return ret; 321f188591eSChris Mason } 322f188591eSChris Mason return -EIO; 323f188591eSChris Mason } 32419c00ddcSChris Mason 325d352ac68SChris Mason /* 326d397712bSChris Mason * checksum a dirty tree block before IO. This has extra checks to make sure 327d397712bSChris Mason * we only fill in the checksum field in the first page of a multi-page block 328d352ac68SChris Mason */ 329d397712bSChris Mason 330b2950863SChristoph Hellwig static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) 33119c00ddcSChris Mason { 332d1310b2eSChris Mason struct extent_io_tree *tree; 33335ebb934SChris Mason u64 start = (u64)page->index << PAGE_CACHE_SHIFT; 33419c00ddcSChris Mason u64 found_start; 33519c00ddcSChris Mason int found_level; 33619c00ddcSChris Mason unsigned long len; 33719c00ddcSChris Mason struct extent_buffer *eb; 338f188591eSChris Mason int ret; 339f188591eSChris Mason 340d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 34119c00ddcSChris Mason 34219c00ddcSChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 34319c00ddcSChris Mason goto out; 34419c00ddcSChris Mason if (!page->private) 34519c00ddcSChris Mason goto out; 34619c00ddcSChris Mason len = page->private >> 2; 347d397712bSChris Mason WARN_ON(len == 0); 348d397712bSChris Mason 34919c00ddcSChris Mason eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); 350ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, 351ca7a79adSChris Mason btrfs_header_generation(eb)); 352f188591eSChris Mason BUG_ON(ret); 35319c00ddcSChris Mason found_start = btrfs_header_bytenr(eb); 35419c00ddcSChris Mason if (found_start != start) { 35555c69072SChris Mason WARN_ON(1); 35655c69072SChris Mason goto err; 35755c69072SChris Mason } 35855c69072SChris Mason if (eb->first_page != page) { 35955c69072SChris Mason WARN_ON(1); 36055c69072SChris Mason goto err; 36155c69072SChris Mason } 36255c69072SChris Mason if (!PageUptodate(page)) { 36355c69072SChris Mason WARN_ON(1); 36455c69072SChris Mason goto err; 36519c00ddcSChris Mason } 36619c00ddcSChris Mason found_level = btrfs_header_level(eb); 3674bef0848SChris Mason 36819c00ddcSChris Mason csum_tree_block(root, eb, 0); 36955c69072SChris Mason err: 37019c00ddcSChris Mason free_extent_buffer(eb); 37119c00ddcSChris Mason out: 37219c00ddcSChris Mason return 0; 37319c00ddcSChris Mason } 37419c00ddcSChris Mason 3752b82032cSYan Zheng static int check_tree_block_fsid(struct btrfs_root *root, 3762b82032cSYan Zheng struct extent_buffer *eb) 3772b82032cSYan Zheng { 3782b82032cSYan Zheng struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 3792b82032cSYan Zheng u8 fsid[BTRFS_UUID_SIZE]; 3802b82032cSYan Zheng int ret = 1; 3812b82032cSYan Zheng 3822b82032cSYan Zheng read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), 3832b82032cSYan Zheng BTRFS_FSID_SIZE); 3842b82032cSYan Zheng while (fs_devices) { 3852b82032cSYan Zheng if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { 3862b82032cSYan Zheng ret = 0; 3872b82032cSYan Zheng break; 3882b82032cSYan Zheng } 3892b82032cSYan Zheng fs_devices = fs_devices->seed; 3902b82032cSYan Zheng } 3912b82032cSYan Zheng return ret; 3922b82032cSYan Zheng } 3932b82032cSYan Zheng 3944008c04aSChris Mason #ifdef CONFIG_DEBUG_LOCK_ALLOC 3954008c04aSChris Mason void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level) 3964008c04aSChris Mason { 3974008c04aSChris Mason lockdep_set_class_and_name(&eb->lock, 3984008c04aSChris Mason &btrfs_eb_class[level], 3994008c04aSChris Mason btrfs_eb_name[level]); 4004008c04aSChris Mason } 4014008c04aSChris Mason #endif 4024008c04aSChris Mason 403b2950863SChristoph Hellwig static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, 404ce9adaa5SChris Mason struct extent_state *state) 405ce9adaa5SChris Mason { 406ce9adaa5SChris Mason struct extent_io_tree *tree; 407ce9adaa5SChris Mason u64 found_start; 408ce9adaa5SChris Mason int found_level; 409ce9adaa5SChris Mason unsigned long len; 410ce9adaa5SChris Mason struct extent_buffer *eb; 411ce9adaa5SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 412f188591eSChris Mason int ret = 0; 413ce9adaa5SChris Mason 414ce9adaa5SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 415ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 416ce9adaa5SChris Mason goto out; 417ce9adaa5SChris Mason if (!page->private) 418ce9adaa5SChris Mason goto out; 419d397712bSChris Mason 420ce9adaa5SChris Mason len = page->private >> 2; 421d397712bSChris Mason WARN_ON(len == 0); 422d397712bSChris Mason 423ce9adaa5SChris Mason eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); 424f188591eSChris Mason 425ce9adaa5SChris Mason found_start = btrfs_header_bytenr(eb); 42623a07867SChris Mason if (found_start != start) { 427193f284dSChris Mason if (printk_ratelimit()) { 428193f284dSChris Mason printk(KERN_INFO "btrfs bad tree block start " 429193f284dSChris Mason "%llu %llu\n", 430a1b32a59SChris Mason (unsigned long long)found_start, 431a1b32a59SChris Mason (unsigned long long)eb->start); 432193f284dSChris Mason } 433f188591eSChris Mason ret = -EIO; 434ce9adaa5SChris Mason goto err; 435ce9adaa5SChris Mason } 436ce9adaa5SChris Mason if (eb->first_page != page) { 437d397712bSChris Mason printk(KERN_INFO "btrfs bad first page %lu %lu\n", 438d397712bSChris Mason eb->first_page->index, page->index); 439ce9adaa5SChris Mason WARN_ON(1); 440f188591eSChris Mason ret = -EIO; 441ce9adaa5SChris Mason goto err; 442ce9adaa5SChris Mason } 4432b82032cSYan Zheng if (check_tree_block_fsid(root, eb)) { 444193f284dSChris Mason if (printk_ratelimit()) { 445d397712bSChris Mason printk(KERN_INFO "btrfs bad fsid on block %llu\n", 446d397712bSChris Mason (unsigned long long)eb->start); 447193f284dSChris Mason } 4481259ab75SChris Mason ret = -EIO; 4491259ab75SChris Mason goto err; 4501259ab75SChris Mason } 451ce9adaa5SChris Mason found_level = btrfs_header_level(eb); 452ce9adaa5SChris Mason 4534008c04aSChris Mason btrfs_set_buffer_lockdep_class(eb, found_level); 4544008c04aSChris Mason 455ce9adaa5SChris Mason ret = csum_tree_block(root, eb, 1); 456f188591eSChris Mason if (ret) 457f188591eSChris Mason ret = -EIO; 458ce9adaa5SChris Mason 459ce9adaa5SChris Mason end = min_t(u64, eb->len, PAGE_CACHE_SIZE); 460ce9adaa5SChris Mason end = eb->start + end - 1; 461ce9adaa5SChris Mason err: 462ce9adaa5SChris Mason free_extent_buffer(eb); 463ce9adaa5SChris Mason out: 464f188591eSChris Mason return ret; 465ce9adaa5SChris Mason } 466ce9adaa5SChris Mason 467ce9adaa5SChris Mason static void end_workqueue_bio(struct bio *bio, int err) 468ce9adaa5SChris Mason { 469ce9adaa5SChris Mason struct end_io_wq *end_io_wq = bio->bi_private; 470ce9adaa5SChris Mason struct btrfs_fs_info *fs_info; 471ce9adaa5SChris Mason 472ce9adaa5SChris Mason fs_info = end_io_wq->info; 473ce9adaa5SChris Mason end_io_wq->error = err; 4748b712842SChris Mason end_io_wq->work.func = end_workqueue_fn; 4758b712842SChris Mason end_io_wq->work.flags = 0; 476d20f7043SChris Mason 477d20f7043SChris Mason if (bio->bi_rw & (1 << BIO_RW)) { 478cad321adSChris Mason if (end_io_wq->metadata) 479cad321adSChris Mason btrfs_queue_worker(&fs_info->endio_meta_write_workers, 480cad321adSChris Mason &end_io_wq->work); 481cad321adSChris Mason else 482e6dcd2dcSChris Mason btrfs_queue_worker(&fs_info->endio_write_workers, 483e6dcd2dcSChris Mason &end_io_wq->work); 484d20f7043SChris Mason } else { 485d20f7043SChris Mason if (end_io_wq->metadata) 486d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_meta_workers, 487d20f7043SChris Mason &end_io_wq->work); 488e6dcd2dcSChris Mason else 489d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_workers, 490d20f7043SChris Mason &end_io_wq->work); 491d20f7043SChris Mason } 492ce9adaa5SChris Mason } 493ce9adaa5SChris Mason 49422c59948SChris Mason int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 49522c59948SChris Mason int metadata) 4960b86a832SChris Mason { 497ce9adaa5SChris Mason struct end_io_wq *end_io_wq; 498ce9adaa5SChris Mason end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); 499ce9adaa5SChris Mason if (!end_io_wq) 500ce9adaa5SChris Mason return -ENOMEM; 501ce9adaa5SChris Mason 502ce9adaa5SChris Mason end_io_wq->private = bio->bi_private; 503ce9adaa5SChris Mason end_io_wq->end_io = bio->bi_end_io; 50422c59948SChris Mason end_io_wq->info = info; 505ce9adaa5SChris Mason end_io_wq->error = 0; 506ce9adaa5SChris Mason end_io_wq->bio = bio; 50722c59948SChris Mason end_io_wq->metadata = metadata; 508ce9adaa5SChris Mason 509ce9adaa5SChris Mason bio->bi_private = end_io_wq; 510ce9adaa5SChris Mason bio->bi_end_io = end_workqueue_bio; 51122c59948SChris Mason return 0; 51222c59948SChris Mason } 51322c59948SChris Mason 514b64a2851SChris Mason unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) 5154854ddd0SChris Mason { 5164854ddd0SChris Mason unsigned long limit = min_t(unsigned long, 5174854ddd0SChris Mason info->workers.max_workers, 5184854ddd0SChris Mason info->fs_devices->open_devices); 5194854ddd0SChris Mason return 256 * limit; 5204854ddd0SChris Mason } 5214854ddd0SChris Mason 522777e6bd7SChris Mason int btrfs_congested_async(struct btrfs_fs_info *info, int iodone) 5230986fe9eSChris Mason { 524b64a2851SChris Mason return atomic_read(&info->nr_async_bios) > 525b64a2851SChris Mason btrfs_async_submit_limit(info); 5260986fe9eSChris Mason } 5270986fe9eSChris Mason 5284a69a410SChris Mason static void run_one_async_start(struct btrfs_work *work) 5294a69a410SChris Mason { 5304a69a410SChris Mason struct btrfs_fs_info *fs_info; 5314a69a410SChris Mason struct async_submit_bio *async; 5324a69a410SChris Mason 5334a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 5344a69a410SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 5354a69a410SChris Mason async->submit_bio_start(async->inode, async->rw, async->bio, 5364a69a410SChris Mason async->mirror_num, async->bio_flags); 5374a69a410SChris Mason } 5384a69a410SChris Mason 5394a69a410SChris Mason static void run_one_async_done(struct btrfs_work *work) 5408b712842SChris Mason { 5418b712842SChris Mason struct btrfs_fs_info *fs_info; 5428b712842SChris Mason struct async_submit_bio *async; 5434854ddd0SChris Mason int limit; 5448b712842SChris Mason 5458b712842SChris Mason async = container_of(work, struct async_submit_bio, work); 5468b712842SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 5474854ddd0SChris Mason 548b64a2851SChris Mason limit = btrfs_async_submit_limit(fs_info); 5494854ddd0SChris Mason limit = limit * 2 / 3; 5504854ddd0SChris Mason 5518b712842SChris Mason atomic_dec(&fs_info->nr_async_submits); 5520986fe9eSChris Mason 553b64a2851SChris Mason if (atomic_read(&fs_info->nr_async_submits) < limit && 554b64a2851SChris Mason waitqueue_active(&fs_info->async_submit_wait)) 5554854ddd0SChris Mason wake_up(&fs_info->async_submit_wait); 5564854ddd0SChris Mason 5574a69a410SChris Mason async->submit_bio_done(async->inode, async->rw, async->bio, 558c8b97818SChris Mason async->mirror_num, async->bio_flags); 5594a69a410SChris Mason } 5604a69a410SChris Mason 5614a69a410SChris Mason static void run_one_async_free(struct btrfs_work *work) 5624a69a410SChris Mason { 5634a69a410SChris Mason struct async_submit_bio *async; 5644a69a410SChris Mason 5654a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 5668b712842SChris Mason kfree(async); 5678b712842SChris Mason } 5688b712842SChris Mason 56944b8bd7eSChris Mason int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 57044b8bd7eSChris Mason int rw, struct bio *bio, int mirror_num, 571c8b97818SChris Mason unsigned long bio_flags, 5724a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start, 5734a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done) 57444b8bd7eSChris Mason { 57544b8bd7eSChris Mason struct async_submit_bio *async; 57644b8bd7eSChris Mason 57744b8bd7eSChris Mason async = kmalloc(sizeof(*async), GFP_NOFS); 57844b8bd7eSChris Mason if (!async) 57944b8bd7eSChris Mason return -ENOMEM; 58044b8bd7eSChris Mason 58144b8bd7eSChris Mason async->inode = inode; 58244b8bd7eSChris Mason async->rw = rw; 58344b8bd7eSChris Mason async->bio = bio; 58444b8bd7eSChris Mason async->mirror_num = mirror_num; 5854a69a410SChris Mason async->submit_bio_start = submit_bio_start; 5864a69a410SChris Mason async->submit_bio_done = submit_bio_done; 5874a69a410SChris Mason 5884a69a410SChris Mason async->work.func = run_one_async_start; 5894a69a410SChris Mason async->work.ordered_func = run_one_async_done; 5904a69a410SChris Mason async->work.ordered_free = run_one_async_free; 5914a69a410SChris Mason 5928b712842SChris Mason async->work.flags = 0; 593c8b97818SChris Mason async->bio_flags = bio_flags; 5948c8bee1dSChris Mason 595cb03c743SChris Mason atomic_inc(&fs_info->nr_async_submits); 596d313d7a3SChris Mason 597d313d7a3SChris Mason if (rw & (1 << BIO_RW_SYNCIO)) 598d313d7a3SChris Mason btrfs_set_work_high_prio(&async->work); 599d313d7a3SChris Mason 6008b712842SChris Mason btrfs_queue_worker(&fs_info->workers, &async->work); 6019473f16cSChris Mason 602771ed689SChris Mason while (atomic_read(&fs_info->async_submit_draining) && 603771ed689SChris Mason atomic_read(&fs_info->nr_async_submits)) { 604771ed689SChris Mason wait_event(fs_info->async_submit_wait, 605771ed689SChris Mason (atomic_read(&fs_info->nr_async_submits) == 0)); 606771ed689SChris Mason } 607771ed689SChris Mason 60844b8bd7eSChris Mason return 0; 60944b8bd7eSChris Mason } 61044b8bd7eSChris Mason 611ce3ed71aSChris Mason static int btree_csum_one_bio(struct bio *bio) 612ce3ed71aSChris Mason { 613ce3ed71aSChris Mason struct bio_vec *bvec = bio->bi_io_vec; 614ce3ed71aSChris Mason int bio_index = 0; 615ce3ed71aSChris Mason struct btrfs_root *root; 616ce3ed71aSChris Mason 617ce3ed71aSChris Mason WARN_ON(bio->bi_vcnt <= 0); 618ce3ed71aSChris Mason while (bio_index < bio->bi_vcnt) { 619ce3ed71aSChris Mason root = BTRFS_I(bvec->bv_page->mapping->host)->root; 620ce3ed71aSChris Mason csum_dirty_buffer(root, bvec->bv_page); 621ce3ed71aSChris Mason bio_index++; 622ce3ed71aSChris Mason bvec++; 623ce3ed71aSChris Mason } 624ce3ed71aSChris Mason return 0; 625ce3ed71aSChris Mason } 626ce3ed71aSChris Mason 6274a69a410SChris Mason static int __btree_submit_bio_start(struct inode *inode, int rw, 6284a69a410SChris Mason struct bio *bio, int mirror_num, 6294a69a410SChris Mason unsigned long bio_flags) 63022c59948SChris Mason { 6318b712842SChris Mason /* 6328b712842SChris Mason * when we're called for a write, we're already in the async 6335443be45SChris Mason * submission context. Just jump into btrfs_map_bio 6348b712842SChris Mason */ 635ce3ed71aSChris Mason btree_csum_one_bio(bio); 6364a69a410SChris Mason return 0; 63722c59948SChris Mason } 63822c59948SChris Mason 6394a69a410SChris Mason static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, 6404a69a410SChris Mason int mirror_num, unsigned long bio_flags) 6414a69a410SChris Mason { 6428b712842SChris Mason /* 6434a69a410SChris Mason * when we're called for a write, we're already in the async 6444a69a410SChris Mason * submission context. Just jump into btrfs_map_bio 6458b712842SChris Mason */ 6468b712842SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); 6470b86a832SChris Mason } 6480b86a832SChris Mason 64944b8bd7eSChris Mason static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 650c8b97818SChris Mason int mirror_num, unsigned long bio_flags) 65144b8bd7eSChris Mason { 6524a69a410SChris Mason int ret; 653cad321adSChris Mason 6544a69a410SChris Mason ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, 6554a69a410SChris Mason bio, 1); 6564a69a410SChris Mason BUG_ON(ret); 6574a69a410SChris Mason 658cad321adSChris Mason if (!(rw & (1 << BIO_RW))) { 659cad321adSChris Mason /* 660cad321adSChris Mason * called for a read, do the setup so that checksum validation 661cad321adSChris Mason * can happen in the async kernel threads 662cad321adSChris Mason */ 6634a69a410SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 6646f3577bdSChris Mason mirror_num, 0); 66544b8bd7eSChris Mason } 666d313d7a3SChris Mason 667cad321adSChris Mason /* 668cad321adSChris Mason * kthread helpers are used to submit writes so that checksumming 669cad321adSChris Mason * can happen in parallel across all CPUs 670cad321adSChris Mason */ 67144b8bd7eSChris Mason return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, 672c8b97818SChris Mason inode, rw, bio, mirror_num, 0, 6734a69a410SChris Mason __btree_submit_bio_start, 6744a69a410SChris Mason __btree_submit_bio_done); 67544b8bd7eSChris Mason } 67644b8bd7eSChris Mason 6775f39d397SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 6785f39d397SChris Mason { 679d1310b2eSChris Mason struct extent_io_tree *tree; 680b9473439SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 681b9473439SChris Mason struct extent_buffer *eb; 682b9473439SChris Mason int was_dirty; 6835443be45SChris Mason 684b9473439SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 685b9473439SChris Mason if (!(current->flags & PF_MEMALLOC)) { 686b9473439SChris Mason return extent_write_full_page(tree, page, 687b9473439SChris Mason btree_get_extent, wbc); 688b9473439SChris Mason } 689b9473439SChris Mason 6905443be45SChris Mason redirty_page_for_writepage(wbc, page); 691b9473439SChris Mason eb = btrfs_find_tree_block(root, page_offset(page), 692b9473439SChris Mason PAGE_CACHE_SIZE); 693b9473439SChris Mason WARN_ON(!eb); 694b9473439SChris Mason 695b9473439SChris Mason was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); 696b9473439SChris Mason if (!was_dirty) { 697b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 698b9473439SChris Mason root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE; 699b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 700b9473439SChris Mason } 701b9473439SChris Mason free_extent_buffer(eb); 702b9473439SChris Mason 7035443be45SChris Mason unlock_page(page); 7045443be45SChris Mason return 0; 7055443be45SChris Mason } 7060da5468fSChris Mason 7070da5468fSChris Mason static int btree_writepages(struct address_space *mapping, 7080da5468fSChris Mason struct writeback_control *wbc) 7090da5468fSChris Mason { 710d1310b2eSChris Mason struct extent_io_tree *tree; 711d1310b2eSChris Mason tree = &BTRFS_I(mapping->host)->io_tree; 712d8d5f3e1SChris Mason if (wbc->sync_mode == WB_SYNC_NONE) { 713b9473439SChris Mason struct btrfs_root *root = BTRFS_I(mapping->host)->root; 714793955bcSChris Mason u64 num_dirty; 71524ab9cd8SChris Mason unsigned long thresh = 32 * 1024 * 1024; 716448d640bSChris Mason 717448d640bSChris Mason if (wbc->for_kupdate) 718448d640bSChris Mason return 0; 719448d640bSChris Mason 720b9473439SChris Mason /* this is a bit racy, but that's ok */ 721b9473439SChris Mason num_dirty = root->fs_info->dirty_metadata_bytes; 722d397712bSChris Mason if (num_dirty < thresh) 723793955bcSChris Mason return 0; 724793955bcSChris Mason } 7250da5468fSChris Mason return extent_writepages(tree, mapping, btree_get_extent, wbc); 7260da5468fSChris Mason } 7270da5468fSChris Mason 728b2950863SChristoph Hellwig static int btree_readpage(struct file *file, struct page *page) 7295f39d397SChris Mason { 730d1310b2eSChris Mason struct extent_io_tree *tree; 731d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 7325f39d397SChris Mason return extent_read_full_page(tree, page, btree_get_extent); 7335f39d397SChris Mason } 7345f39d397SChris Mason 73570dec807SChris Mason static int btree_releasepage(struct page *page, gfp_t gfp_flags) 7365f39d397SChris Mason { 737d1310b2eSChris Mason struct extent_io_tree *tree; 738d1310b2eSChris Mason struct extent_map_tree *map; 7395f39d397SChris Mason int ret; 7405f39d397SChris Mason 74198509cfcSChris Mason if (PageWriteback(page) || PageDirty(page)) 74298509cfcSChris Mason return 0; 74398509cfcSChris Mason 744d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 745d1310b2eSChris Mason map = &BTRFS_I(page->mapping->host)->extent_tree; 7466af118ceSChris Mason 7477b13b7b1SChris Mason ret = try_release_extent_state(map, tree, page, gfp_flags); 748d397712bSChris Mason if (!ret) 7496af118ceSChris Mason return 0; 7506af118ceSChris Mason 7516af118ceSChris Mason ret = try_release_extent_buffer(tree, page); 7525f39d397SChris Mason if (ret == 1) { 7535f39d397SChris Mason ClearPagePrivate(page); 7545f39d397SChris Mason set_page_private(page, 0); 755d98237b3SChris Mason page_cache_release(page); 7565f39d397SChris Mason } 7576af118ceSChris Mason 758d98237b3SChris Mason return ret; 759d98237b3SChris Mason } 760d98237b3SChris Mason 7615f39d397SChris Mason static void btree_invalidatepage(struct page *page, unsigned long offset) 762d98237b3SChris Mason { 763d1310b2eSChris Mason struct extent_io_tree *tree; 764d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 7655f39d397SChris Mason extent_invalidatepage(tree, page, offset); 7665f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 7679ad6b7bcSChris Mason if (PagePrivate(page)) { 768d397712bSChris Mason printk(KERN_WARNING "btrfs warning page private not zero " 769d397712bSChris Mason "on page %llu\n", (unsigned long long)page_offset(page)); 7709ad6b7bcSChris Mason ClearPagePrivate(page); 7719ad6b7bcSChris Mason set_page_private(page, 0); 7729ad6b7bcSChris Mason page_cache_release(page); 7739ad6b7bcSChris Mason } 774d98237b3SChris Mason } 775d98237b3SChris Mason 776d98237b3SChris Mason static struct address_space_operations btree_aops = { 777d98237b3SChris Mason .readpage = btree_readpage, 778d98237b3SChris Mason .writepage = btree_writepage, 7790da5468fSChris Mason .writepages = btree_writepages, 7805f39d397SChris Mason .releasepage = btree_releasepage, 7815f39d397SChris Mason .invalidatepage = btree_invalidatepage, 782d98237b3SChris Mason .sync_page = block_sync_page, 783d98237b3SChris Mason }; 784123abc88SChris Mason 785ca7a79adSChris Mason int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, 786ca7a79adSChris Mason u64 parent_transid) 787090d1875SChris Mason { 7885f39d397SChris Mason struct extent_buffer *buf = NULL; 7895f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 790de428b63SChris Mason int ret = 0; 791090d1875SChris Mason 792db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 7935f39d397SChris Mason if (!buf) 794090d1875SChris Mason return 0; 795d1310b2eSChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, 796f188591eSChris Mason buf, 0, 0, btree_get_extent, 0); 7975f39d397SChris Mason free_extent_buffer(buf); 798de428b63SChris Mason return ret; 799090d1875SChris Mason } 800090d1875SChris Mason 8010999df54SChris Mason struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, 8020999df54SChris Mason u64 bytenr, u32 blocksize) 8030999df54SChris Mason { 8040999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 8050999df54SChris Mason struct extent_buffer *eb; 8060999df54SChris Mason eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 8070999df54SChris Mason bytenr, blocksize, GFP_NOFS); 8080999df54SChris Mason return eb; 8090999df54SChris Mason } 8100999df54SChris Mason 8110999df54SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 8120999df54SChris Mason u64 bytenr, u32 blocksize) 8130999df54SChris Mason { 8140999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 8150999df54SChris Mason struct extent_buffer *eb; 8160999df54SChris Mason 8170999df54SChris Mason eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 8180999df54SChris Mason bytenr, blocksize, NULL, GFP_NOFS); 8190999df54SChris Mason return eb; 8200999df54SChris Mason } 8210999df54SChris Mason 8220999df54SChris Mason 823e02119d5SChris Mason int btrfs_write_tree_block(struct extent_buffer *buf) 824e02119d5SChris Mason { 825e02119d5SChris Mason return btrfs_fdatawrite_range(buf->first_page->mapping, buf->start, 82624ab9cd8SChris Mason buf->start + buf->len - 1, WB_SYNC_ALL); 827e02119d5SChris Mason } 828e02119d5SChris Mason 829e02119d5SChris Mason int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) 830e02119d5SChris Mason { 831e02119d5SChris Mason return btrfs_wait_on_page_writeback_range(buf->first_page->mapping, 832e02119d5SChris Mason buf->start, buf->start + buf->len - 1); 833e02119d5SChris Mason } 834e02119d5SChris Mason 835db94535dSChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, 836ca7a79adSChris Mason u32 blocksize, u64 parent_transid) 837e20d96d6SChris Mason { 8385f39d397SChris Mason struct extent_buffer *buf = NULL; 8395f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 840d1310b2eSChris Mason struct extent_io_tree *io_tree; 84119c00ddcSChris Mason int ret; 84219c00ddcSChris Mason 843d1310b2eSChris Mason io_tree = &BTRFS_I(btree_inode)->io_tree; 844e20d96d6SChris Mason 845db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 8465f39d397SChris Mason if (!buf) 847d98237b3SChris Mason return NULL; 848e4204dedSChris Mason 849ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 850ce9adaa5SChris Mason 851d397712bSChris Mason if (ret == 0) 852b4ce94deSChris Mason set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); 8535f39d397SChris Mason return buf; 854ce9adaa5SChris Mason 855eb60ceacSChris Mason } 856eb60ceacSChris Mason 857e089f05cSChris Mason int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, 8585f39d397SChris Mason struct extent_buffer *buf) 859ed2ff2cbSChris Mason { 8605f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 86155c69072SChris Mason if (btrfs_header_generation(buf) == 862925baeddSChris Mason root->fs_info->running_transaction->transid) { 863b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 864b4ce94deSChris Mason 865b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { 866b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 867b9473439SChris Mason if (root->fs_info->dirty_metadata_bytes >= buf->len) 868b9473439SChris Mason root->fs_info->dirty_metadata_bytes -= buf->len; 869b9473439SChris Mason else 870b9473439SChris Mason WARN_ON(1); 871b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 872b9473439SChris Mason } 873b4ce94deSChris Mason 874b9473439SChris Mason /* ugh, clear_extent_buffer_dirty needs to lock the page */ 875b9473439SChris Mason btrfs_set_lock_blocking(buf); 876d1310b2eSChris Mason clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 87755c69072SChris Mason buf); 878925baeddSChris Mason } 8795f39d397SChris Mason return 0; 8805f39d397SChris Mason } 8815f39d397SChris Mason 882db94535dSChris Mason static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 88387ee04ebSChris Mason u32 stripesize, struct btrfs_root *root, 8849f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 885e20d96d6SChris Mason u64 objectid) 886d97e63b6SChris Mason { 887cfaa7295SChris Mason root->node = NULL; 888a28ec197SChris Mason root->commit_root = NULL; 889db94535dSChris Mason root->sectorsize = sectorsize; 890db94535dSChris Mason root->nodesize = nodesize; 891db94535dSChris Mason root->leafsize = leafsize; 89287ee04ebSChris Mason root->stripesize = stripesize; 893123abc88SChris Mason root->ref_cows = 0; 8940b86a832SChris Mason root->track_dirty = 0; 8950b86a832SChris Mason 8969f5fae2fSChris Mason root->fs_info = fs_info; 8970f7d52f4SChris Mason root->objectid = objectid; 8980f7d52f4SChris Mason root->last_trans = 0; 89913a8a7c8SYan, Zheng root->highest_objectid = 0; 90058176a96SJosef Bacik root->name = NULL; 9014313b399SChris Mason root->in_sysfs = 0; 9025d4f98a2SYan Zheng root->inode_tree.rb_node = NULL; 9030b86a832SChris Mason 9040b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 9057b128766SJosef Bacik INIT_LIST_HEAD(&root->orphan_list); 9065d4f98a2SYan Zheng INIT_LIST_HEAD(&root->root_list); 907925baeddSChris Mason spin_lock_init(&root->node_lock); 908bcc63abbSYan spin_lock_init(&root->list_lock); 9095d4f98a2SYan Zheng spin_lock_init(&root->inode_lock); 910a2135011SChris Mason mutex_init(&root->objectid_mutex); 911e02119d5SChris Mason mutex_init(&root->log_mutex); 9127237f183SYan Zheng init_waitqueue_head(&root->log_writer_wait); 9137237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[0]); 9147237f183SYan Zheng init_waitqueue_head(&root->log_commit_wait[1]); 9157237f183SYan Zheng atomic_set(&root->log_commit[0], 0); 9167237f183SYan Zheng atomic_set(&root->log_commit[1], 0); 9177237f183SYan Zheng atomic_set(&root->log_writers, 0); 9187237f183SYan Zheng root->log_batch = 0; 9197237f183SYan Zheng root->log_transid = 0; 920d0c803c4SChris Mason extent_io_tree_init(&root->dirty_log_pages, 921d0c803c4SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 922017e5369SChris Mason 9233768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 9243768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 9256702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 92658176a96SJosef Bacik memset(&root->root_kobj, 0, sizeof(root->root_kobj)); 9273f157a2fSChris Mason root->defrag_trans_start = fs_info->generation; 92858176a96SJosef Bacik init_completion(&root->kobj_unregister); 9296702ed49SChris Mason root->defrag_running = 0; 9306702ed49SChris Mason root->defrag_level = 0; 9314d775673SChris Mason root->root_key.objectid = objectid; 9323394e160SChris Mason root->anon_super.s_root = NULL; 9333394e160SChris Mason root->anon_super.s_dev = 0; 9343394e160SChris Mason INIT_LIST_HEAD(&root->anon_super.s_list); 9353394e160SChris Mason INIT_LIST_HEAD(&root->anon_super.s_instances); 9363394e160SChris Mason init_rwsem(&root->anon_super.s_umount); 9373394e160SChris Mason 9383768f368SChris Mason return 0; 9393768f368SChris Mason } 9403768f368SChris Mason 941db94535dSChris Mason static int find_and_setup_root(struct btrfs_root *tree_root, 9429f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 9439f5fae2fSChris Mason u64 objectid, 944e20d96d6SChris Mason struct btrfs_root *root) 9453768f368SChris Mason { 9463768f368SChris Mason int ret; 947db94535dSChris Mason u32 blocksize; 94884234f3aSYan Zheng u64 generation; 9493768f368SChris Mason 950db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 95187ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 95287ee04ebSChris Mason root, fs_info, objectid); 9533768f368SChris Mason ret = btrfs_find_last_root(tree_root, objectid, 9543768f368SChris Mason &root->root_item, &root->root_key); 9554df27c4dSYan, Zheng if (ret > 0) 9564df27c4dSYan, Zheng return -ENOENT; 9573768f368SChris Mason BUG_ON(ret); 9583768f368SChris Mason 95984234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 960db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 961db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 96284234f3aSYan Zheng blocksize, generation); 9633768f368SChris Mason BUG_ON(!root->node); 9644df27c4dSYan, Zheng root->commit_root = btrfs_root_node(root); 965d97e63b6SChris Mason return 0; 966d97e63b6SChris Mason } 967d97e63b6SChris Mason 968e02119d5SChris Mason int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, 969e02119d5SChris Mason struct btrfs_fs_info *fs_info) 970e02119d5SChris Mason { 971e02119d5SChris Mason struct extent_buffer *eb; 972d0c803c4SChris Mason struct btrfs_root *log_root_tree = fs_info->log_root_tree; 973d0c803c4SChris Mason u64 start = 0; 974d0c803c4SChris Mason u64 end = 0; 975e02119d5SChris Mason int ret; 976e02119d5SChris Mason 977d0c803c4SChris Mason if (!log_root_tree) 978e02119d5SChris Mason return 0; 979e02119d5SChris Mason 980d0c803c4SChris Mason while (1) { 981d0c803c4SChris Mason ret = find_first_extent_bit(&log_root_tree->dirty_log_pages, 982d0c803c4SChris Mason 0, &start, &end, EXTENT_DIRTY); 983d0c803c4SChris Mason if (ret) 984d0c803c4SChris Mason break; 985d0c803c4SChris Mason 986d0c803c4SChris Mason clear_extent_dirty(&log_root_tree->dirty_log_pages, 987d0c803c4SChris Mason start, end, GFP_NOFS); 988d0c803c4SChris Mason } 989e02119d5SChris Mason eb = fs_info->log_root_tree->node; 990e02119d5SChris Mason 991e02119d5SChris Mason WARN_ON(btrfs_header_level(eb) != 0); 992e02119d5SChris Mason WARN_ON(btrfs_header_nritems(eb) != 0); 993e02119d5SChris Mason 994d00aff00SChris Mason ret = btrfs_free_reserved_extent(fs_info->tree_root, 995d00aff00SChris Mason eb->start, eb->len); 996e02119d5SChris Mason BUG_ON(ret); 997e02119d5SChris Mason 998e02119d5SChris Mason free_extent_buffer(eb); 999e02119d5SChris Mason kfree(fs_info->log_root_tree); 1000e02119d5SChris Mason fs_info->log_root_tree = NULL; 1001e02119d5SChris Mason return 0; 1002e02119d5SChris Mason } 1003e02119d5SChris Mason 10047237f183SYan Zheng static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, 1005e02119d5SChris Mason struct btrfs_fs_info *fs_info) 10060f7d52f4SChris Mason { 10070f7d52f4SChris Mason struct btrfs_root *root; 10080f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 10097237f183SYan Zheng struct extent_buffer *leaf; 1010e02119d5SChris Mason 1011e02119d5SChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 1012e02119d5SChris Mason if (!root) 10137237f183SYan Zheng return ERR_PTR(-ENOMEM); 1014e02119d5SChris Mason 1015e02119d5SChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 1016e02119d5SChris Mason tree_root->sectorsize, tree_root->stripesize, 1017e02119d5SChris Mason root, fs_info, BTRFS_TREE_LOG_OBJECTID); 1018e02119d5SChris Mason 1019e02119d5SChris Mason root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; 1020e02119d5SChris Mason root->root_key.type = BTRFS_ROOT_ITEM_KEY; 1021e02119d5SChris Mason root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; 10227237f183SYan Zheng /* 10237237f183SYan Zheng * log trees do not get reference counted because they go away 10247237f183SYan Zheng * before a real commit is actually done. They do store pointers 10257237f183SYan Zheng * to file data extents, and those reference counts still get 10267237f183SYan Zheng * updated (along with back refs to the log tree). 10277237f183SYan Zheng */ 1028e02119d5SChris Mason root->ref_cows = 0; 1029e02119d5SChris Mason 10305d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 10315d4f98a2SYan Zheng BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0); 10327237f183SYan Zheng if (IS_ERR(leaf)) { 10337237f183SYan Zheng kfree(root); 10347237f183SYan Zheng return ERR_CAST(leaf); 10357237f183SYan Zheng } 1036e02119d5SChris Mason 10375d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 10385d4f98a2SYan Zheng btrfs_set_header_bytenr(leaf, leaf->start); 10395d4f98a2SYan Zheng btrfs_set_header_generation(leaf, trans->transid); 10405d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 10415d4f98a2SYan Zheng btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); 10427237f183SYan Zheng root->node = leaf; 1043e02119d5SChris Mason 1044e02119d5SChris Mason write_extent_buffer(root->node, root->fs_info->fsid, 1045e02119d5SChris Mason (unsigned long)btrfs_header_fsid(root->node), 1046e02119d5SChris Mason BTRFS_FSID_SIZE); 1047e02119d5SChris Mason btrfs_mark_buffer_dirty(root->node); 1048e02119d5SChris Mason btrfs_tree_unlock(root->node); 10497237f183SYan Zheng return root; 10507237f183SYan Zheng } 10517237f183SYan Zheng 10527237f183SYan Zheng int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 10537237f183SYan Zheng struct btrfs_fs_info *fs_info) 10547237f183SYan Zheng { 10557237f183SYan Zheng struct btrfs_root *log_root; 10567237f183SYan Zheng 10577237f183SYan Zheng log_root = alloc_log_tree(trans, fs_info); 10587237f183SYan Zheng if (IS_ERR(log_root)) 10597237f183SYan Zheng return PTR_ERR(log_root); 10607237f183SYan Zheng WARN_ON(fs_info->log_root_tree); 10617237f183SYan Zheng fs_info->log_root_tree = log_root; 10627237f183SYan Zheng return 0; 10637237f183SYan Zheng } 10647237f183SYan Zheng 10657237f183SYan Zheng int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 10667237f183SYan Zheng struct btrfs_root *root) 10677237f183SYan Zheng { 10687237f183SYan Zheng struct btrfs_root *log_root; 10697237f183SYan Zheng struct btrfs_inode_item *inode_item; 10707237f183SYan Zheng 10717237f183SYan Zheng log_root = alloc_log_tree(trans, root->fs_info); 10727237f183SYan Zheng if (IS_ERR(log_root)) 10737237f183SYan Zheng return PTR_ERR(log_root); 10747237f183SYan Zheng 10757237f183SYan Zheng log_root->last_trans = trans->transid; 10767237f183SYan Zheng log_root->root_key.offset = root->root_key.objectid; 10777237f183SYan Zheng 10787237f183SYan Zheng inode_item = &log_root->root_item.inode; 10797237f183SYan Zheng inode_item->generation = cpu_to_le64(1); 10807237f183SYan Zheng inode_item->size = cpu_to_le64(3); 10817237f183SYan Zheng inode_item->nlink = cpu_to_le32(1); 10827237f183SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 10837237f183SYan Zheng inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 10847237f183SYan Zheng 10855d4f98a2SYan Zheng btrfs_set_root_node(&log_root->root_item, log_root->node); 10867237f183SYan Zheng 10877237f183SYan Zheng WARN_ON(root->log_root); 10887237f183SYan Zheng root->log_root = log_root; 10897237f183SYan Zheng root->log_transid = 0; 1090e02119d5SChris Mason return 0; 1091e02119d5SChris Mason } 1092e02119d5SChris Mason 1093e02119d5SChris Mason struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, 1094e02119d5SChris Mason struct btrfs_key *location) 1095e02119d5SChris Mason { 1096e02119d5SChris Mason struct btrfs_root *root; 1097e02119d5SChris Mason struct btrfs_fs_info *fs_info = tree_root->fs_info; 10980f7d52f4SChris Mason struct btrfs_path *path; 10995f39d397SChris Mason struct extent_buffer *l; 110084234f3aSYan Zheng u64 generation; 1101db94535dSChris Mason u32 blocksize; 11020f7d52f4SChris Mason int ret = 0; 11030f7d52f4SChris Mason 11045eda7b5eSChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 11050cf6c620SChris Mason if (!root) 11060f7d52f4SChris Mason return ERR_PTR(-ENOMEM); 11070f7d52f4SChris Mason if (location->offset == (u64)-1) { 1108db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 11090f7d52f4SChris Mason location->objectid, root); 11100f7d52f4SChris Mason if (ret) { 11110f7d52f4SChris Mason kfree(root); 11120f7d52f4SChris Mason return ERR_PTR(ret); 11130f7d52f4SChris Mason } 111413a8a7c8SYan, Zheng goto out; 11150f7d52f4SChris Mason } 11160f7d52f4SChris Mason 1117db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 111887ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 111987ee04ebSChris Mason root, fs_info, location->objectid); 11200f7d52f4SChris Mason 11210f7d52f4SChris Mason path = btrfs_alloc_path(); 11220f7d52f4SChris Mason BUG_ON(!path); 11230f7d52f4SChris Mason ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); 112413a8a7c8SYan, Zheng if (ret == 0) { 11255f39d397SChris Mason l = path->nodes[0]; 11265f39d397SChris Mason read_extent_buffer(l, &root->root_item, 11275f39d397SChris Mason btrfs_item_ptr_offset(l, path->slots[0]), 11280f7d52f4SChris Mason sizeof(root->root_item)); 112944b36eb2SYan Zheng memcpy(&root->root_key, location, sizeof(*location)); 113013a8a7c8SYan, Zheng } 11310f7d52f4SChris Mason btrfs_free_path(path); 11320f7d52f4SChris Mason if (ret) { 113313a8a7c8SYan, Zheng if (ret > 0) 113413a8a7c8SYan, Zheng ret = -ENOENT; 11350f7d52f4SChris Mason return ERR_PTR(ret); 11360f7d52f4SChris Mason } 113713a8a7c8SYan, Zheng 113884234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1139db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 1140db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 114184234f3aSYan Zheng blocksize, generation); 11425d4f98a2SYan Zheng root->commit_root = btrfs_root_node(root); 11430f7d52f4SChris Mason BUG_ON(!root->node); 114413a8a7c8SYan, Zheng out: 114513a8a7c8SYan, Zheng if (location->objectid != BTRFS_TREE_LOG_OBJECTID) 11460f7d52f4SChris Mason root->ref_cows = 1; 114713a8a7c8SYan, Zheng 11485eda7b5eSChris Mason return root; 11495eda7b5eSChris Mason } 11505eda7b5eSChris Mason 1151dc17ff8fSChris Mason struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, 1152dc17ff8fSChris Mason u64 root_objectid) 1153dc17ff8fSChris Mason { 1154dc17ff8fSChris Mason struct btrfs_root *root; 1155dc17ff8fSChris Mason 1156dc17ff8fSChris Mason if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) 1157dc17ff8fSChris Mason return fs_info->tree_root; 1158dc17ff8fSChris Mason if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) 1159dc17ff8fSChris Mason return fs_info->extent_root; 1160dc17ff8fSChris Mason 1161dc17ff8fSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 1162dc17ff8fSChris Mason (unsigned long)root_objectid); 1163dc17ff8fSChris Mason return root; 1164dc17ff8fSChris Mason } 1165dc17ff8fSChris Mason 1166edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 1167edbd8d4eSChris Mason struct btrfs_key *location) 11685eda7b5eSChris Mason { 11695eda7b5eSChris Mason struct btrfs_root *root; 11705eda7b5eSChris Mason int ret; 11715eda7b5eSChris Mason 1172edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 1173edbd8d4eSChris Mason return fs_info->tree_root; 1174edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 1175edbd8d4eSChris Mason return fs_info->extent_root; 11768f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 11778f18cf13SChris Mason return fs_info->chunk_root; 11788f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 11798f18cf13SChris Mason return fs_info->dev_root; 11800403e47eSYan Zheng if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) 11810403e47eSYan Zheng return fs_info->csum_root; 11824df27c4dSYan, Zheng again: 11834df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 11845eda7b5eSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 11855eda7b5eSChris Mason (unsigned long)location->objectid); 11864df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 11875eda7b5eSChris Mason if (root) 11885eda7b5eSChris Mason return root; 11895eda7b5eSChris Mason 11904df27c4dSYan, Zheng ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid); 11914df27c4dSYan, Zheng if (ret == 0) 11924df27c4dSYan, Zheng ret = -ENOENT; 11934df27c4dSYan, Zheng if (ret < 0) 11944df27c4dSYan, Zheng return ERR_PTR(ret); 11954df27c4dSYan, Zheng 1196e02119d5SChris Mason root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); 11975eda7b5eSChris Mason if (IS_ERR(root)) 11985eda7b5eSChris Mason return root; 11993394e160SChris Mason 12004df27c4dSYan, Zheng WARN_ON(btrfs_root_refs(&root->root_item) == 0); 12013394e160SChris Mason set_anon_super(&root->anon_super, NULL); 12023394e160SChris Mason 12034df27c4dSYan, Zheng ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); 12044df27c4dSYan, Zheng if (ret) 12054df27c4dSYan, Zheng goto fail; 12064df27c4dSYan, Zheng 12074df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 12082619ba1fSChris Mason ret = radix_tree_insert(&fs_info->fs_roots_radix, 12092619ba1fSChris Mason (unsigned long)root->root_key.objectid, 12100f7d52f4SChris Mason root); 12114df27c4dSYan, Zheng if (ret == 0) 12124df27c4dSYan, Zheng root->in_radix = 1; 12134df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 12144df27c4dSYan, Zheng radix_tree_preload_end(); 12150f7d52f4SChris Mason if (ret) { 12164df27c4dSYan, Zheng if (ret == -EEXIST) { 12174df27c4dSYan, Zheng free_fs_root(root); 12184df27c4dSYan, Zheng goto again; 12190f7d52f4SChris Mason } 12204df27c4dSYan, Zheng goto fail; 12214df27c4dSYan, Zheng } 12224df27c4dSYan, Zheng 1223edbd8d4eSChris Mason ret = btrfs_find_dead_roots(fs_info->tree_root, 12245d4f98a2SYan Zheng root->root_key.objectid); 12254df27c4dSYan, Zheng WARN_ON(ret); 12264df27c4dSYan, Zheng 12274df27c4dSYan, Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) 1228c146afadSYan Zheng btrfs_orphan_cleanup(root); 12294df27c4dSYan, Zheng 1230edbd8d4eSChris Mason return root; 12314df27c4dSYan, Zheng fail: 12324df27c4dSYan, Zheng free_fs_root(root); 12334df27c4dSYan, Zheng return ERR_PTR(ret); 1234edbd8d4eSChris Mason } 1235edbd8d4eSChris Mason 1236edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, 1237edbd8d4eSChris Mason struct btrfs_key *location, 1238edbd8d4eSChris Mason const char *name, int namelen) 1239edbd8d4eSChris Mason { 12404df27c4dSYan, Zheng return btrfs_read_fs_root_no_name(fs_info, location); 12414df27c4dSYan, Zheng #if 0 1242edbd8d4eSChris Mason struct btrfs_root *root; 1243edbd8d4eSChris Mason int ret; 1244edbd8d4eSChris Mason 1245edbd8d4eSChris Mason root = btrfs_read_fs_root_no_name(fs_info, location); 1246edbd8d4eSChris Mason if (!root) 1247edbd8d4eSChris Mason return NULL; 124858176a96SJosef Bacik 12494313b399SChris Mason if (root->in_sysfs) 12504313b399SChris Mason return root; 12514313b399SChris Mason 125258176a96SJosef Bacik ret = btrfs_set_root_name(root, name, namelen); 125358176a96SJosef Bacik if (ret) { 12545f39d397SChris Mason free_extent_buffer(root->node); 125558176a96SJosef Bacik kfree(root); 125658176a96SJosef Bacik return ERR_PTR(ret); 125758176a96SJosef Bacik } 12584df27c4dSYan, Zheng 125958176a96SJosef Bacik ret = btrfs_sysfs_add_root(root); 126058176a96SJosef Bacik if (ret) { 12615f39d397SChris Mason free_extent_buffer(root->node); 126258176a96SJosef Bacik kfree(root->name); 126358176a96SJosef Bacik kfree(root); 126458176a96SJosef Bacik return ERR_PTR(ret); 126558176a96SJosef Bacik } 12664313b399SChris Mason root->in_sysfs = 1; 12670f7d52f4SChris Mason return root; 12684df27c4dSYan, Zheng #endif 12690f7d52f4SChris Mason } 127004160088SChris Mason 127104160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 127204160088SChris Mason { 127304160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 127404160088SChris Mason int ret = 0; 127504160088SChris Mason struct btrfs_device *device; 127604160088SChris Mason struct backing_dev_info *bdi; 1277b7967db7SChris Mason 1278c6e30871SQinghuang Feng list_for_each_entry(device, &info->fs_devices->devices, dev_list) { 1279dfe25020SChris Mason if (!device->bdev) 1280dfe25020SChris Mason continue; 128104160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 128204160088SChris Mason if (bdi && bdi_congested(bdi, bdi_bits)) { 128304160088SChris Mason ret = 1; 128404160088SChris Mason break; 128504160088SChris Mason } 128604160088SChris Mason } 128704160088SChris Mason return ret; 128804160088SChris Mason } 128904160088SChris Mason 129038b66988SChris Mason /* 129138b66988SChris Mason * this unplugs every device on the box, and it is only used when page 129238b66988SChris Mason * is null 129338b66988SChris Mason */ 129438b66988SChris Mason static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 129538b66988SChris Mason { 129638b66988SChris Mason struct btrfs_device *device; 129738b66988SChris Mason struct btrfs_fs_info *info; 129838b66988SChris Mason 129938b66988SChris Mason info = (struct btrfs_fs_info *)bdi->unplug_io_data; 1300c6e30871SQinghuang Feng list_for_each_entry(device, &info->fs_devices->devices, dev_list) { 1301d20f7043SChris Mason if (!device->bdev) 1302d20f7043SChris Mason continue; 1303d20f7043SChris Mason 130438b66988SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 1305d397712bSChris Mason if (bdi->unplug_io_fn) 130638b66988SChris Mason bdi->unplug_io_fn(bdi, page); 130738b66988SChris Mason } 130838b66988SChris Mason } 130938b66988SChris Mason 1310b2950863SChristoph Hellwig static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 131104160088SChris Mason { 131238b66988SChris Mason struct inode *inode; 1313f2d8d74dSChris Mason struct extent_map_tree *em_tree; 1314f2d8d74dSChris Mason struct extent_map *em; 1315bcbfce8aSChris Mason struct address_space *mapping; 131638b66988SChris Mason u64 offset; 131738b66988SChris Mason 1318bcbfce8aSChris Mason /* the generic O_DIRECT read code does this */ 13199f0ba5bdSChris Mason if (1 || !page) { 132038b66988SChris Mason __unplug_io_fn(bdi, page); 132138b66988SChris Mason return; 132238b66988SChris Mason } 132338b66988SChris Mason 1324bcbfce8aSChris Mason /* 1325bcbfce8aSChris Mason * page->mapping may change at any time. Get a consistent copy 1326bcbfce8aSChris Mason * and use that for everything below 1327bcbfce8aSChris Mason */ 1328bcbfce8aSChris Mason smp_mb(); 1329bcbfce8aSChris Mason mapping = page->mapping; 1330bcbfce8aSChris Mason if (!mapping) 1331bcbfce8aSChris Mason return; 1332bcbfce8aSChris Mason 1333bcbfce8aSChris Mason inode = mapping->host; 1334240d5d48SChris Mason 1335240d5d48SChris Mason /* 1336240d5d48SChris Mason * don't do the expensive searching for a small number of 1337240d5d48SChris Mason * devices 1338240d5d48SChris Mason */ 1339240d5d48SChris Mason if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) { 1340240d5d48SChris Mason __unplug_io_fn(bdi, page); 1341240d5d48SChris Mason return; 1342240d5d48SChris Mason } 1343240d5d48SChris Mason 134438b66988SChris Mason offset = page_offset(page); 134504160088SChris Mason 1346f2d8d74dSChris Mason em_tree = &BTRFS_I(inode)->extent_tree; 1347890871beSChris Mason read_lock(&em_tree->lock); 1348f2d8d74dSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 1349890871beSChris Mason read_unlock(&em_tree->lock); 135089642229SChris Mason if (!em) { 135189642229SChris Mason __unplug_io_fn(bdi, page); 1352f2d8d74dSChris Mason return; 135389642229SChris Mason } 1354f2d8d74dSChris Mason 135589642229SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 135689642229SChris Mason free_extent_map(em); 135789642229SChris Mason __unplug_io_fn(bdi, page); 135889642229SChris Mason return; 135989642229SChris Mason } 1360f2d8d74dSChris Mason offset = offset - em->start; 1361f2d8d74dSChris Mason btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, 1362f2d8d74dSChris Mason em->block_start + offset, page); 1363f2d8d74dSChris Mason free_extent_map(em); 136404160088SChris Mason } 136504160088SChris Mason 1366ad081f14SJens Axboe /* 1367ad081f14SJens Axboe * If this fails, caller must call bdi_destroy() to get rid of the 1368ad081f14SJens Axboe * bdi again. 1369ad081f14SJens Axboe */ 137004160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 137104160088SChris Mason { 1372ad081f14SJens Axboe int err; 1373ad081f14SJens Axboe 1374ad081f14SJens Axboe bdi->capabilities = BDI_CAP_MAP_COPY; 1375ad081f14SJens Axboe err = bdi_init(bdi); 1376ad081f14SJens Axboe if (err) 1377ad081f14SJens Axboe return err; 1378ad081f14SJens Axboe 1379ad081f14SJens Axboe err = bdi_register(bdi, NULL, "btrfs-%d", 1380ad081f14SJens Axboe atomic_inc_return(&btrfs_bdi_num)); 1381ad081f14SJens Axboe if (err) 1382ad081f14SJens Axboe return err; 1383ad081f14SJens Axboe 13844575c9ccSChris Mason bdi->ra_pages = default_backing_dev_info.ra_pages; 138504160088SChris Mason bdi->unplug_io_fn = btrfs_unplug_io_fn; 138604160088SChris Mason bdi->unplug_io_data = info; 138704160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 138804160088SChris Mason bdi->congested_data = info; 138904160088SChris Mason return 0; 139004160088SChris Mason } 139104160088SChris Mason 1392ce9adaa5SChris Mason static int bio_ready_for_csum(struct bio *bio) 1393ce9adaa5SChris Mason { 1394ce9adaa5SChris Mason u64 length = 0; 1395ce9adaa5SChris Mason u64 buf_len = 0; 1396ce9adaa5SChris Mason u64 start = 0; 1397ce9adaa5SChris Mason struct page *page; 1398ce9adaa5SChris Mason struct extent_io_tree *io_tree = NULL; 1399ce9adaa5SChris Mason struct btrfs_fs_info *info = NULL; 1400ce9adaa5SChris Mason struct bio_vec *bvec; 1401ce9adaa5SChris Mason int i; 1402ce9adaa5SChris Mason int ret; 1403ce9adaa5SChris Mason 1404ce9adaa5SChris Mason bio_for_each_segment(bvec, bio, i) { 1405ce9adaa5SChris Mason page = bvec->bv_page; 1406ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 1407ce9adaa5SChris Mason length += bvec->bv_len; 1408ce9adaa5SChris Mason continue; 1409ce9adaa5SChris Mason } 1410ce9adaa5SChris Mason if (!page->private) { 1411ce9adaa5SChris Mason length += bvec->bv_len; 1412ce9adaa5SChris Mason continue; 1413ce9adaa5SChris Mason } 1414ce9adaa5SChris Mason length = bvec->bv_len; 1415ce9adaa5SChris Mason buf_len = page->private >> 2; 1416ce9adaa5SChris Mason start = page_offset(page) + bvec->bv_offset; 1417ce9adaa5SChris Mason io_tree = &BTRFS_I(page->mapping->host)->io_tree; 1418ce9adaa5SChris Mason info = BTRFS_I(page->mapping->host)->root->fs_info; 1419ce9adaa5SChris Mason } 1420ce9adaa5SChris Mason /* are we fully contained in this bio? */ 1421ce9adaa5SChris Mason if (buf_len <= length) 1422ce9adaa5SChris Mason return 1; 1423ce9adaa5SChris Mason 1424ce9adaa5SChris Mason ret = extent_range_uptodate(io_tree, start + length, 1425ce9adaa5SChris Mason start + buf_len - 1); 1426ce9adaa5SChris Mason return ret; 1427ce9adaa5SChris Mason } 1428ce9adaa5SChris Mason 14298b712842SChris Mason /* 14308b712842SChris Mason * called by the kthread helper functions to finally call the bio end_io 14318b712842SChris Mason * functions. This is where read checksum verification actually happens 14328b712842SChris Mason */ 14338b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work) 1434ce9adaa5SChris Mason { 1435ce9adaa5SChris Mason struct bio *bio; 14368b712842SChris Mason struct end_io_wq *end_io_wq; 14378b712842SChris Mason struct btrfs_fs_info *fs_info; 1438ce9adaa5SChris Mason int error; 1439ce9adaa5SChris Mason 14408b712842SChris Mason end_io_wq = container_of(work, struct end_io_wq, work); 1441ce9adaa5SChris Mason bio = end_io_wq->bio; 14428b712842SChris Mason fs_info = end_io_wq->info; 14438b712842SChris Mason 1444cad321adSChris Mason /* metadata bio reads are special because the whole tree block must 14458b712842SChris Mason * be checksummed at once. This makes sure the entire block is in 14468b712842SChris Mason * ram and up to date before trying to verify things. For 14478b712842SChris Mason * blocksize <= pagesize, it is basically a noop 14488b712842SChris Mason */ 1449cad321adSChris Mason if (!(bio->bi_rw & (1 << BIO_RW)) && end_io_wq->metadata && 1450cad321adSChris Mason !bio_ready_for_csum(bio)) { 1451d20f7043SChris Mason btrfs_queue_worker(&fs_info->endio_meta_workers, 14528b712842SChris Mason &end_io_wq->work); 1453ce9adaa5SChris Mason return; 1454ce9adaa5SChris Mason } 1455ce9adaa5SChris Mason error = end_io_wq->error; 1456ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1457ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 1458ce9adaa5SChris Mason kfree(end_io_wq); 1459ce9adaa5SChris Mason bio_endio(bio, error); 1460ce9adaa5SChris Mason } 146144b8bd7eSChris Mason 1462a74a4b97SChris Mason static int cleaner_kthread(void *arg) 1463a74a4b97SChris Mason { 1464a74a4b97SChris Mason struct btrfs_root *root = arg; 1465a74a4b97SChris Mason 1466a74a4b97SChris Mason do { 1467a74a4b97SChris Mason smp_mb(); 1468a74a4b97SChris Mason if (root->fs_info->closing) 1469a74a4b97SChris Mason break; 1470a74a4b97SChris Mason 1471a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 1472a74a4b97SChris Mason mutex_lock(&root->fs_info->cleaner_mutex); 1473a74a4b97SChris Mason btrfs_clean_old_snapshots(root); 1474a74a4b97SChris Mason mutex_unlock(&root->fs_info->cleaner_mutex); 1475a74a4b97SChris Mason 1476a74a4b97SChris Mason if (freezing(current)) { 1477a74a4b97SChris Mason refrigerator(); 1478a74a4b97SChris Mason } else { 1479a74a4b97SChris Mason smp_mb(); 1480a74a4b97SChris Mason if (root->fs_info->closing) 1481a74a4b97SChris Mason break; 1482a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 1483a74a4b97SChris Mason schedule(); 1484a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1485a74a4b97SChris Mason } 1486a74a4b97SChris Mason } while (!kthread_should_stop()); 1487a74a4b97SChris Mason return 0; 1488a74a4b97SChris Mason } 1489a74a4b97SChris Mason 1490a74a4b97SChris Mason static int transaction_kthread(void *arg) 1491a74a4b97SChris Mason { 1492a74a4b97SChris Mason struct btrfs_root *root = arg; 1493a74a4b97SChris Mason struct btrfs_trans_handle *trans; 1494a74a4b97SChris Mason struct btrfs_transaction *cur; 1495a74a4b97SChris Mason unsigned long now; 1496a74a4b97SChris Mason unsigned long delay; 1497a74a4b97SChris Mason int ret; 1498a74a4b97SChris Mason 1499a74a4b97SChris Mason do { 1500a74a4b97SChris Mason smp_mb(); 1501a74a4b97SChris Mason if (root->fs_info->closing) 1502a74a4b97SChris Mason break; 1503a74a4b97SChris Mason 1504a74a4b97SChris Mason delay = HZ * 30; 1505a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 1506a74a4b97SChris Mason mutex_lock(&root->fs_info->transaction_kthread_mutex); 1507a74a4b97SChris Mason 1508a74a4b97SChris Mason mutex_lock(&root->fs_info->trans_mutex); 1509a74a4b97SChris Mason cur = root->fs_info->running_transaction; 1510a74a4b97SChris Mason if (!cur) { 1511a74a4b97SChris Mason mutex_unlock(&root->fs_info->trans_mutex); 1512a74a4b97SChris Mason goto sleep; 1513a74a4b97SChris Mason } 151431153d81SYan Zheng 1515a74a4b97SChris Mason now = get_seconds(); 1516a74a4b97SChris Mason if (now < cur->start_time || now - cur->start_time < 30) { 1517a74a4b97SChris Mason mutex_unlock(&root->fs_info->trans_mutex); 1518a74a4b97SChris Mason delay = HZ * 5; 1519a74a4b97SChris Mason goto sleep; 1520a74a4b97SChris Mason } 1521a74a4b97SChris Mason mutex_unlock(&root->fs_info->trans_mutex); 1522a74a4b97SChris Mason trans = btrfs_start_transaction(root, 1); 1523a74a4b97SChris Mason ret = btrfs_commit_transaction(trans, root); 152456bec294SChris Mason 1525a74a4b97SChris Mason sleep: 1526a74a4b97SChris Mason wake_up_process(root->fs_info->cleaner_kthread); 1527a74a4b97SChris Mason mutex_unlock(&root->fs_info->transaction_kthread_mutex); 1528a74a4b97SChris Mason 1529a74a4b97SChris Mason if (freezing(current)) { 1530a74a4b97SChris Mason refrigerator(); 1531a74a4b97SChris Mason } else { 1532a74a4b97SChris Mason if (root->fs_info->closing) 1533a74a4b97SChris Mason break; 1534a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 1535a74a4b97SChris Mason schedule_timeout(delay); 1536a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1537a74a4b97SChris Mason } 1538a74a4b97SChris Mason } while (!kthread_should_stop()); 1539a74a4b97SChris Mason return 0; 1540a74a4b97SChris Mason } 1541a74a4b97SChris Mason 15428a4b83ccSChris Mason struct btrfs_root *open_ctree(struct super_block *sb, 1543dfe25020SChris Mason struct btrfs_fs_devices *fs_devices, 1544dfe25020SChris Mason char *options) 1545eb60ceacSChris Mason { 1546db94535dSChris Mason u32 sectorsize; 1547db94535dSChris Mason u32 nodesize; 1548db94535dSChris Mason u32 leafsize; 1549db94535dSChris Mason u32 blocksize; 155087ee04ebSChris Mason u32 stripesize; 155184234f3aSYan Zheng u64 generation; 1552f2b636e8SJosef Bacik u64 features; 15533de4586cSChris Mason struct btrfs_key location; 1554a061fc8dSChris Mason struct buffer_head *bh; 1555e02119d5SChris Mason struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), 1556e20d96d6SChris Mason GFP_NOFS); 1557d20f7043SChris Mason struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root), 1558d20f7043SChris Mason GFP_NOFS); 1559e02119d5SChris Mason struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root), 1560e20d96d6SChris Mason GFP_NOFS); 15618790d502SChris Mason struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info), 1562e20d96d6SChris Mason GFP_NOFS); 1563e02119d5SChris Mason struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), 15640b86a832SChris Mason GFP_NOFS); 1565e02119d5SChris Mason struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), 15660b86a832SChris Mason GFP_NOFS); 1567e02119d5SChris Mason struct btrfs_root *log_tree_root; 1568e02119d5SChris Mason 1569eb60ceacSChris Mason int ret; 1570e58ca020SYan int err = -EINVAL; 15714543df7eSChris Mason 15722c90e5d6SChris Mason struct btrfs_super_block *disk_super; 15738790d502SChris Mason 15740463bb4eSJim Meyering if (!extent_root || !tree_root || !fs_info || 1575d20f7043SChris Mason !chunk_root || !dev_root || !csum_root) { 157639279cc3SChris Mason err = -ENOMEM; 157739279cc3SChris Mason goto fail; 157839279cc3SChris Mason } 15790f7d52f4SChris Mason INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS); 15808fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 1581facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 158219c00ddcSChris Mason INIT_LIST_HEAD(&fs_info->hashers); 1583ea8c2819SChris Mason INIT_LIST_HEAD(&fs_info->delalloc_inodes); 15845a3f23d5SChris Mason INIT_LIST_HEAD(&fs_info->ordered_operations); 158511833d66SYan Zheng INIT_LIST_HEAD(&fs_info->caching_block_groups); 15861832a6d5SChris Mason spin_lock_init(&fs_info->delalloc_lock); 1587cee36a03SChris Mason spin_lock_init(&fs_info->new_trans_lock); 158831153d81SYan Zheng spin_lock_init(&fs_info->ref_cache_lock); 158919c00ddcSChris Mason 159058176a96SJosef Bacik init_completion(&fs_info->kobj_unregister); 15919f5fae2fSChris Mason fs_info->tree_root = tree_root; 15929f5fae2fSChris Mason fs_info->extent_root = extent_root; 1593d20f7043SChris Mason fs_info->csum_root = csum_root; 15940b86a832SChris Mason fs_info->chunk_root = chunk_root; 15950b86a832SChris Mason fs_info->dev_root = dev_root; 15968a4b83ccSChris Mason fs_info->fs_devices = fs_devices; 15970b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 15986324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 15990b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 1600cb03c743SChris Mason atomic_set(&fs_info->nr_async_submits, 0); 1601771ed689SChris Mason atomic_set(&fs_info->async_delalloc_pages, 0); 16028c8bee1dSChris Mason atomic_set(&fs_info->async_submit_draining, 0); 16030986fe9eSChris Mason atomic_set(&fs_info->nr_async_bios, 0); 1604e20d96d6SChris Mason fs_info->sb = sb; 1605c59f8951SChris Mason fs_info->max_extent = (u64)-1; 16066f568d35SChris Mason fs_info->max_inline = 8192 * 1024; 1607ad081f14SJens Axboe if (setup_bdi(fs_info, &fs_info->bdi)) 1608ad081f14SJens Axboe goto fail_bdi; 1609d98237b3SChris Mason fs_info->btree_inode = new_inode(sb); 1610d98237b3SChris Mason fs_info->btree_inode->i_ino = 1; 16112c90e5d6SChris Mason fs_info->btree_inode->i_nlink = 1; 161297e728d4SJosef Bacik fs_info->metadata_ratio = 8; 1613c8b97818SChris Mason 1614b34b086cSChris Mason fs_info->thread_pool_size = min_t(unsigned long, 1615b34b086cSChris Mason num_online_cpus() + 2, 8); 16160afbaf8cSChris Mason 16173eaa2885SChris Mason INIT_LIST_HEAD(&fs_info->ordered_extents); 16183eaa2885SChris Mason spin_lock_init(&fs_info->ordered_extent_lock); 16193eaa2885SChris Mason 1620a061fc8dSChris Mason sb->s_blocksize = 4096; 1621a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 1622a061fc8dSChris Mason 16230afbaf8cSChris Mason /* 16240afbaf8cSChris Mason * we set the i_size on the btree inode to the max possible int. 16250afbaf8cSChris Mason * the real end of the address space is determined by all of 16260afbaf8cSChris Mason * the devices in the system 16270afbaf8cSChris Mason */ 16280afbaf8cSChris Mason fs_info->btree_inode->i_size = OFFSET_MAX; 1629d98237b3SChris Mason fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 163004160088SChris Mason fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; 163104160088SChris Mason 16325d4f98a2SYan Zheng RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); 1633d1310b2eSChris Mason extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 16345f39d397SChris Mason fs_info->btree_inode->i_mapping, 16355f39d397SChris Mason GFP_NOFS); 1636d1310b2eSChris Mason extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, 1637d1310b2eSChris Mason GFP_NOFS); 16380da5468fSChris Mason 1639d1310b2eSChris Mason BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 1640d1310b2eSChris Mason 16410f9dd46cSJosef Bacik spin_lock_init(&fs_info->block_group_cache_lock); 16420f9dd46cSJosef Bacik fs_info->block_group_cache_tree.rb_node = NULL; 16430f9dd46cSJosef Bacik 164411833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[0], 16451a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 164611833d66SYan Zheng extent_io_tree_init(&fs_info->freed_extents[1], 164711833d66SYan Zheng fs_info->btree_inode->i_mapping, GFP_NOFS); 164811833d66SYan Zheng fs_info->pinned_extents = &fs_info->freed_extents[0]; 1649e66f709bSChris Mason fs_info->do_barriers = 1; 1650e18e4809SChris Mason 16510f7d52f4SChris Mason BTRFS_I(fs_info->btree_inode)->root = tree_root; 16520f7d52f4SChris Mason memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 16530f7d52f4SChris Mason sizeof(struct btrfs_key)); 165422b0ebdaSChris Mason insert_inode_hash(fs_info->btree_inode); 165539279cc3SChris Mason 165679154b1bSChris Mason mutex_init(&fs_info->trans_mutex); 16575a3f23d5SChris Mason mutex_init(&fs_info->ordered_operations_mutex); 1658e02119d5SChris Mason mutex_init(&fs_info->tree_log_mutex); 1659a2135011SChris Mason mutex_init(&fs_info->drop_mutex); 1660925baeddSChris Mason mutex_init(&fs_info->chunk_mutex); 1661a74a4b97SChris Mason mutex_init(&fs_info->transaction_kthread_mutex); 1662a74a4b97SChris Mason mutex_init(&fs_info->cleaner_mutex); 16637d9eb12cSChris Mason mutex_init(&fs_info->volume_mutex); 16641a40e23bSZheng Yan mutex_init(&fs_info->tree_reloc_mutex); 1665276e680dSYan Zheng init_rwsem(&fs_info->extent_commit_sem); 1666fa9c0d79SChris Mason 1667fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); 1668fa9c0d79SChris Mason btrfs_init_free_cluster(&fs_info->data_alloc_cluster); 1669fa9c0d79SChris Mason 1670e6dcd2dcSChris Mason init_waitqueue_head(&fs_info->transaction_throttle); 1671f9295749SChris Mason init_waitqueue_head(&fs_info->transaction_wait); 16724854ddd0SChris Mason init_waitqueue_head(&fs_info->async_submit_wait); 16733768f368SChris Mason 16740b86a832SChris Mason __setup_root(4096, 4096, 4096, 4096, tree_root, 16752c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 16767eccb903SChris Mason 1677d98237b3SChris Mason 1678a512bbf8SYan Zheng bh = btrfs_read_dev_super(fs_devices->latest_bdev); 1679a061fc8dSChris Mason if (!bh) 168039279cc3SChris Mason goto fail_iput; 168139279cc3SChris Mason 1682a061fc8dSChris Mason memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); 16832d69a0f8SYan Zheng memcpy(&fs_info->super_for_commit, &fs_info->super_copy, 16842d69a0f8SYan Zheng sizeof(fs_info->super_for_commit)); 1685a061fc8dSChris Mason brelse(bh); 16865f39d397SChris Mason 1687a061fc8dSChris Mason memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); 16880b86a832SChris Mason 16895f39d397SChris Mason disk_super = &fs_info->super_copy; 16900f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 1691c6e2bac1SJosef Bacik goto fail_iput; 16920f7d52f4SChris Mason 16932b82032cSYan Zheng ret = btrfs_parse_options(tree_root, options); 16942b82032cSYan Zheng if (ret) { 16952b82032cSYan Zheng err = ret; 1696c6e2bac1SJosef Bacik goto fail_iput; 16972b82032cSYan Zheng } 1698dfe25020SChris Mason 1699f2b636e8SJosef Bacik features = btrfs_super_incompat_flags(disk_super) & 1700f2b636e8SJosef Bacik ~BTRFS_FEATURE_INCOMPAT_SUPP; 1701f2b636e8SJosef Bacik if (features) { 1702f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount because of " 1703f2b636e8SJosef Bacik "unsupported optional features (%Lx).\n", 170421380931SJoel Becker (unsigned long long)features); 1705f2b636e8SJosef Bacik err = -EINVAL; 1706c6e2bac1SJosef Bacik goto fail_iput; 1707f2b636e8SJosef Bacik } 1708f2b636e8SJosef Bacik 17095d4f98a2SYan Zheng features = btrfs_super_incompat_flags(disk_super); 17105d4f98a2SYan Zheng if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) { 17115d4f98a2SYan Zheng features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; 17125d4f98a2SYan Zheng btrfs_set_super_incompat_flags(disk_super, features); 17135d4f98a2SYan Zheng } 17145d4f98a2SYan Zheng 1715f2b636e8SJosef Bacik features = btrfs_super_compat_ro_flags(disk_super) & 1716f2b636e8SJosef Bacik ~BTRFS_FEATURE_COMPAT_RO_SUPP; 1717f2b636e8SJosef Bacik if (!(sb->s_flags & MS_RDONLY) && features) { 1718f2b636e8SJosef Bacik printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " 1719f2b636e8SJosef Bacik "unsupported option features (%Lx).\n", 172021380931SJoel Becker (unsigned long long)features); 1721f2b636e8SJosef Bacik err = -EINVAL; 1722c6e2bac1SJosef Bacik goto fail_iput; 1723f2b636e8SJosef Bacik } 17249042846bSChris Mason printk("thread pool is %d\n", fs_info->thread_pool_size); 17254543df7eSChris Mason /* 17264543df7eSChris Mason * we need to start all the end_io workers up front because the 17274543df7eSChris Mason * queue work function gets called at interrupt time, and so it 17284543df7eSChris Mason * cannot dynamically grow. 17294543df7eSChris Mason */ 17305443be45SChris Mason btrfs_init_workers(&fs_info->workers, "worker", 17315443be45SChris Mason fs_info->thread_pool_size); 1732c8b97818SChris Mason 1733771ed689SChris Mason btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", 1734771ed689SChris Mason fs_info->thread_pool_size); 1735771ed689SChris Mason 17365443be45SChris Mason btrfs_init_workers(&fs_info->submit_workers, "submit", 1737b720d209SChris Mason min_t(u64, fs_devices->num_devices, 1738b720d209SChris Mason fs_info->thread_pool_size)); 173961b49440SChris Mason 174061b49440SChris Mason /* a higher idle thresh on the submit workers makes it much more 174161b49440SChris Mason * likely that bios will be send down in a sane order to the 174261b49440SChris Mason * devices 174361b49440SChris Mason */ 174461b49440SChris Mason fs_info->submit_workers.idle_thresh = 64; 174553863232SChris Mason 1746771ed689SChris Mason fs_info->workers.idle_thresh = 16; 17474a69a410SChris Mason fs_info->workers.ordered = 1; 174861b49440SChris Mason 1749771ed689SChris Mason fs_info->delalloc_workers.idle_thresh = 2; 1750771ed689SChris Mason fs_info->delalloc_workers.ordered = 1; 1751771ed689SChris Mason 17525443be45SChris Mason btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1); 17535443be45SChris Mason btrfs_init_workers(&fs_info->endio_workers, "endio", 17545443be45SChris Mason fs_info->thread_pool_size); 1755d20f7043SChris Mason btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", 1756d20f7043SChris Mason fs_info->thread_pool_size); 1757cad321adSChris Mason btrfs_init_workers(&fs_info->endio_meta_write_workers, 1758cad321adSChris Mason "endio-meta-write", fs_info->thread_pool_size); 17595443be45SChris Mason btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", 1760e6dcd2dcSChris Mason fs_info->thread_pool_size); 176161b49440SChris Mason 176261b49440SChris Mason /* 176361b49440SChris Mason * endios are largely parallel and should have a very 176461b49440SChris Mason * low idle thresh 176561b49440SChris Mason */ 176661b49440SChris Mason fs_info->endio_workers.idle_thresh = 4; 1767b51912c9SChris Mason fs_info->endio_meta_workers.idle_thresh = 4; 1768b51912c9SChris Mason 17699042846bSChris Mason fs_info->endio_write_workers.idle_thresh = 2; 17709042846bSChris Mason fs_info->endio_meta_write_workers.idle_thresh = 2; 17719042846bSChris Mason 17729042846bSChris Mason fs_info->endio_workers.atomic_worker_start = 1; 17739042846bSChris Mason fs_info->endio_meta_workers.atomic_worker_start = 1; 17749042846bSChris Mason fs_info->endio_write_workers.atomic_worker_start = 1; 17759042846bSChris Mason fs_info->endio_meta_write_workers.atomic_worker_start = 1; 177661b49440SChris Mason 17774543df7eSChris Mason btrfs_start_workers(&fs_info->workers, 1); 17781cc127b5SChris Mason btrfs_start_workers(&fs_info->submit_workers, 1); 1779771ed689SChris Mason btrfs_start_workers(&fs_info->delalloc_workers, 1); 1780247e743cSChris Mason btrfs_start_workers(&fs_info->fixup_workers, 1); 17819042846bSChris Mason btrfs_start_workers(&fs_info->endio_workers, 1); 17829042846bSChris Mason btrfs_start_workers(&fs_info->endio_meta_workers, 1); 17839042846bSChris Mason btrfs_start_workers(&fs_info->endio_meta_write_workers, 1); 17849042846bSChris Mason btrfs_start_workers(&fs_info->endio_write_workers, 1); 17854543df7eSChris Mason 17864575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 1787c8b97818SChris Mason fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, 1788c8b97818SChris Mason 4 * 1024 * 1024 / PAGE_CACHE_SIZE); 17894575c9ccSChris Mason 1790db94535dSChris Mason nodesize = btrfs_super_nodesize(disk_super); 1791db94535dSChris Mason leafsize = btrfs_super_leafsize(disk_super); 1792db94535dSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 179387ee04ebSChris Mason stripesize = btrfs_super_stripesize(disk_super); 1794db94535dSChris Mason tree_root->nodesize = nodesize; 1795db94535dSChris Mason tree_root->leafsize = leafsize; 1796db94535dSChris Mason tree_root->sectorsize = sectorsize; 179787ee04ebSChris Mason tree_root->stripesize = stripesize; 1798a061fc8dSChris Mason 1799a061fc8dSChris Mason sb->s_blocksize = sectorsize; 1800a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 1801db94535dSChris Mason 180239279cc3SChris Mason if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, 180339279cc3SChris Mason sizeof(disk_super->magic))) { 1804d397712bSChris Mason printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id); 180539279cc3SChris Mason goto fail_sb_buffer; 180639279cc3SChris Mason } 180719c00ddcSChris Mason 1808925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 1809e4404d6eSYan Zheng ret = btrfs_read_sys_array(tree_root); 1810925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 181184eed90fSChris Mason if (ret) { 1812d397712bSChris Mason printk(KERN_WARNING "btrfs: failed to read the system " 1813d397712bSChris Mason "array on %s\n", sb->s_id); 18145d4f98a2SYan Zheng goto fail_sb_buffer; 181584eed90fSChris Mason } 18160b86a832SChris Mason 18170b86a832SChris Mason blocksize = btrfs_level_size(tree_root, 18180b86a832SChris Mason btrfs_super_chunk_root_level(disk_super)); 181984234f3aSYan Zheng generation = btrfs_super_chunk_root_generation(disk_super); 18200b86a832SChris Mason 18210b86a832SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 18220b86a832SChris Mason chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); 18230b86a832SChris Mason 18240b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 18250b86a832SChris Mason btrfs_super_chunk_root(disk_super), 182684234f3aSYan Zheng blocksize, generation); 18270b86a832SChris Mason BUG_ON(!chunk_root->node); 182883121942SDavid Woodhouse if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { 182983121942SDavid Woodhouse printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", 183083121942SDavid Woodhouse sb->s_id); 183183121942SDavid Woodhouse goto fail_chunk_root; 183283121942SDavid Woodhouse } 18335d4f98a2SYan Zheng btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); 18345d4f98a2SYan Zheng chunk_root->commit_root = btrfs_root_node(chunk_root); 18350b86a832SChris Mason 1836e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 1837e17cade2SChris Mason (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), 1838e17cade2SChris Mason BTRFS_UUID_SIZE); 1839e17cade2SChris Mason 1840925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 18410b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 1842925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 18432b82032cSYan Zheng if (ret) { 1844d397712bSChris Mason printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n", 1845d397712bSChris Mason sb->s_id); 18462b82032cSYan Zheng goto fail_chunk_root; 18472b82032cSYan Zheng } 18480b86a832SChris Mason 1849dfe25020SChris Mason btrfs_close_extra_devices(fs_devices); 1850dfe25020SChris Mason 1851db94535dSChris Mason blocksize = btrfs_level_size(tree_root, 1852db94535dSChris Mason btrfs_super_root_level(disk_super)); 185384234f3aSYan Zheng generation = btrfs_super_generation(disk_super); 18540b86a832SChris Mason 1855e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 1856db94535dSChris Mason btrfs_super_root(disk_super), 185784234f3aSYan Zheng blocksize, generation); 185839279cc3SChris Mason if (!tree_root->node) 18592b82032cSYan Zheng goto fail_chunk_root; 186083121942SDavid Woodhouse if (!test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { 186183121942SDavid Woodhouse printk(KERN_WARNING "btrfs: failed to read tree root on %s\n", 186283121942SDavid Woodhouse sb->s_id); 186383121942SDavid Woodhouse goto fail_tree_root; 186483121942SDavid Woodhouse } 18655d4f98a2SYan Zheng btrfs_set_root_node(&tree_root->root_item, tree_root->node); 18665d4f98a2SYan Zheng tree_root->commit_root = btrfs_root_node(tree_root); 1867db94535dSChris Mason 1868db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 1869e20d96d6SChris Mason BTRFS_EXTENT_TREE_OBJECTID, extent_root); 18700b86a832SChris Mason if (ret) 187139279cc3SChris Mason goto fail_tree_root; 18720b86a832SChris Mason extent_root->track_dirty = 1; 18730b86a832SChris Mason 18740b86a832SChris Mason ret = find_and_setup_root(tree_root, fs_info, 18750b86a832SChris Mason BTRFS_DEV_TREE_OBJECTID, dev_root); 18760b86a832SChris Mason if (ret) 18770b86a832SChris Mason goto fail_extent_root; 18785d4f98a2SYan Zheng dev_root->track_dirty = 1; 18793768f368SChris Mason 1880d20f7043SChris Mason ret = find_and_setup_root(tree_root, fs_info, 1881d20f7043SChris Mason BTRFS_CSUM_TREE_OBJECTID, csum_root); 1882d20f7043SChris Mason if (ret) 18835d4f98a2SYan Zheng goto fail_dev_root; 1884d20f7043SChris Mason 1885d20f7043SChris Mason csum_root->track_dirty = 1; 1886d20f7043SChris Mason 18879078a3e1SChris Mason btrfs_read_block_groups(extent_root); 18889078a3e1SChris Mason 18892d69a0f8SYan Zheng fs_info->generation = generation; 1890c146afadSYan Zheng fs_info->last_trans_committed = generation; 1891d18a2c44SChris Mason fs_info->data_alloc_profile = (u64)-1; 1892d18a2c44SChris Mason fs_info->metadata_alloc_profile = (u64)-1; 1893611f0e00SChris Mason fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; 1894a74a4b97SChris Mason fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, 1895a74a4b97SChris Mason "btrfs-cleaner"); 189657506d50SQinghuang Feng if (IS_ERR(fs_info->cleaner_kthread)) 1897d20f7043SChris Mason goto fail_csum_root; 1898a74a4b97SChris Mason 1899a74a4b97SChris Mason fs_info->transaction_kthread = kthread_run(transaction_kthread, 1900a74a4b97SChris Mason tree_root, 1901a74a4b97SChris Mason "btrfs-transaction"); 190257506d50SQinghuang Feng if (IS_ERR(fs_info->transaction_kthread)) 19033f157a2fSChris Mason goto fail_cleaner; 1904a74a4b97SChris Mason 1905c289811cSChris Mason if (!btrfs_test_opt(tree_root, SSD) && 1906c289811cSChris Mason !btrfs_test_opt(tree_root, NOSSD) && 1907c289811cSChris Mason !fs_info->fs_devices->rotating) { 1908c289811cSChris Mason printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD " 1909c289811cSChris Mason "mode\n"); 1910c289811cSChris Mason btrfs_set_opt(fs_info->mount_opt, SSD); 1911c289811cSChris Mason } 1912c289811cSChris Mason 1913e02119d5SChris Mason if (btrfs_super_log_root(disk_super) != 0) { 1914e02119d5SChris Mason u64 bytenr = btrfs_super_log_root(disk_super); 1915d18a2c44SChris Mason 19167c2ca468SChris Mason if (fs_devices->rw_devices == 0) { 1917d397712bSChris Mason printk(KERN_WARNING "Btrfs log replay required " 1918d397712bSChris Mason "on RO media\n"); 19197c2ca468SChris Mason err = -EIO; 19207c2ca468SChris Mason goto fail_trans_kthread; 19217c2ca468SChris Mason } 1922e02119d5SChris Mason blocksize = 1923e02119d5SChris Mason btrfs_level_size(tree_root, 1924e02119d5SChris Mason btrfs_super_log_root_level(disk_super)); 1925e02119d5SChris Mason 1926e02119d5SChris Mason log_tree_root = kzalloc(sizeof(struct btrfs_root), 1927e02119d5SChris Mason GFP_NOFS); 1928e02119d5SChris Mason 1929e02119d5SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 1930e02119d5SChris Mason log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); 1931e02119d5SChris Mason 1932e02119d5SChris Mason log_tree_root->node = read_tree_block(tree_root, bytenr, 193384234f3aSYan Zheng blocksize, 193484234f3aSYan Zheng generation + 1); 1935e02119d5SChris Mason ret = btrfs_recover_log_trees(log_tree_root); 1936e02119d5SChris Mason BUG_ON(ret); 1937e556ce2cSYan Zheng 1938e556ce2cSYan Zheng if (sb->s_flags & MS_RDONLY) { 1939e556ce2cSYan Zheng ret = btrfs_commit_super(tree_root); 1940e556ce2cSYan Zheng BUG_ON(ret); 1941e556ce2cSYan Zheng } 1942e02119d5SChris Mason } 19431a40e23bSZheng Yan 19447c2ca468SChris Mason if (!(sb->s_flags & MS_RDONLY)) { 19455d4f98a2SYan Zheng ret = btrfs_recover_relocation(tree_root); 19461a40e23bSZheng Yan BUG_ON(ret); 19477c2ca468SChris Mason } 19481a40e23bSZheng Yan 19493de4586cSChris Mason location.objectid = BTRFS_FS_TREE_OBJECTID; 19503de4586cSChris Mason location.type = BTRFS_ROOT_ITEM_KEY; 19513de4586cSChris Mason location.offset = (u64)-1; 19523de4586cSChris Mason 19533de4586cSChris Mason fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); 19543de4586cSChris Mason if (!fs_info->fs_root) 19557c2ca468SChris Mason goto fail_trans_kthread; 1956c289811cSChris Mason 19570f7d52f4SChris Mason return tree_root; 195839279cc3SChris Mason 19597c2ca468SChris Mason fail_trans_kthread: 19607c2ca468SChris Mason kthread_stop(fs_info->transaction_kthread); 19613f157a2fSChris Mason fail_cleaner: 1962a74a4b97SChris Mason kthread_stop(fs_info->cleaner_kthread); 19637c2ca468SChris Mason 19647c2ca468SChris Mason /* 19657c2ca468SChris Mason * make sure we're done with the btree inode before we stop our 19667c2ca468SChris Mason * kthreads 19677c2ca468SChris Mason */ 19687c2ca468SChris Mason filemap_write_and_wait(fs_info->btree_inode->i_mapping); 19697c2ca468SChris Mason invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 19707c2ca468SChris Mason 1971d20f7043SChris Mason fail_csum_root: 1972d20f7043SChris Mason free_extent_buffer(csum_root->node); 19735d4f98a2SYan Zheng free_extent_buffer(csum_root->commit_root); 19745d4f98a2SYan Zheng fail_dev_root: 19755d4f98a2SYan Zheng free_extent_buffer(dev_root->node); 19765d4f98a2SYan Zheng free_extent_buffer(dev_root->commit_root); 19770b86a832SChris Mason fail_extent_root: 19780b86a832SChris Mason free_extent_buffer(extent_root->node); 19795d4f98a2SYan Zheng free_extent_buffer(extent_root->commit_root); 198039279cc3SChris Mason fail_tree_root: 19815f39d397SChris Mason free_extent_buffer(tree_root->node); 19825d4f98a2SYan Zheng free_extent_buffer(tree_root->commit_root); 19832b82032cSYan Zheng fail_chunk_root: 19842b82032cSYan Zheng free_extent_buffer(chunk_root->node); 19855d4f98a2SYan Zheng free_extent_buffer(chunk_root->commit_root); 198639279cc3SChris Mason fail_sb_buffer: 1987247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 1988771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 19898b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 19908b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 1991d20f7043SChris Mason btrfs_stop_workers(&fs_info->endio_meta_workers); 1992cad321adSChris Mason btrfs_stop_workers(&fs_info->endio_meta_write_workers); 1993e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 19941cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 19954543df7eSChris Mason fail_iput: 19967c2ca468SChris Mason invalidate_inode_pages2(fs_info->btree_inode->i_mapping); 19974543df7eSChris Mason iput(fs_info->btree_inode); 19987e662854SQinghuang Feng 1999dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 200084eed90fSChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 2001ad081f14SJens Axboe fail_bdi: 20027e662854SQinghuang Feng bdi_destroy(&fs_info->bdi); 20037e662854SQinghuang Feng fail: 200439279cc3SChris Mason kfree(extent_root); 200539279cc3SChris Mason kfree(tree_root); 200639279cc3SChris Mason kfree(fs_info); 200783afeac4SJim Meyering kfree(chunk_root); 200883afeac4SJim Meyering kfree(dev_root); 2009d20f7043SChris Mason kfree(csum_root); 201039279cc3SChris Mason return ERR_PTR(err); 2011eb60ceacSChris Mason } 2012eb60ceacSChris Mason 2013f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 2014f2984462SChris Mason { 2015f2984462SChris Mason char b[BDEVNAME_SIZE]; 2016f2984462SChris Mason 2017f2984462SChris Mason if (uptodate) { 2018f2984462SChris Mason set_buffer_uptodate(bh); 2019f2984462SChris Mason } else { 2020f2984462SChris Mason if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { 2021f2984462SChris Mason printk(KERN_WARNING "lost page write due to " 2022f2984462SChris Mason "I/O error on %s\n", 2023f2984462SChris Mason bdevname(bh->b_bdev, b)); 2024f2984462SChris Mason } 20251259ab75SChris Mason /* note, we dont' set_buffer_write_io_error because we have 20261259ab75SChris Mason * our own ways of dealing with the IO errors 20271259ab75SChris Mason */ 2028f2984462SChris Mason clear_buffer_uptodate(bh); 2029f2984462SChris Mason } 2030f2984462SChris Mason unlock_buffer(bh); 2031f2984462SChris Mason put_bh(bh); 2032f2984462SChris Mason } 2033f2984462SChris Mason 2034a512bbf8SYan Zheng struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) 2035a512bbf8SYan Zheng { 2036a512bbf8SYan Zheng struct buffer_head *bh; 2037a512bbf8SYan Zheng struct buffer_head *latest = NULL; 2038a512bbf8SYan Zheng struct btrfs_super_block *super; 2039a512bbf8SYan Zheng int i; 2040a512bbf8SYan Zheng u64 transid = 0; 2041a512bbf8SYan Zheng u64 bytenr; 2042a512bbf8SYan Zheng 2043a512bbf8SYan Zheng /* we would like to check all the supers, but that would make 2044a512bbf8SYan Zheng * a btrfs mount succeed after a mkfs from a different FS. 2045a512bbf8SYan Zheng * So, we need to add a special mount option to scan for 2046a512bbf8SYan Zheng * later supers, using BTRFS_SUPER_MIRROR_MAX instead 2047a512bbf8SYan Zheng */ 2048a512bbf8SYan Zheng for (i = 0; i < 1; i++) { 2049a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2050a512bbf8SYan Zheng if (bytenr + 4096 >= i_size_read(bdev->bd_inode)) 2051a512bbf8SYan Zheng break; 2052a512bbf8SYan Zheng bh = __bread(bdev, bytenr / 4096, 4096); 2053a512bbf8SYan Zheng if (!bh) 2054a512bbf8SYan Zheng continue; 2055a512bbf8SYan Zheng 2056a512bbf8SYan Zheng super = (struct btrfs_super_block *)bh->b_data; 2057a512bbf8SYan Zheng if (btrfs_super_bytenr(super) != bytenr || 2058a512bbf8SYan Zheng strncmp((char *)(&super->magic), BTRFS_MAGIC, 2059a512bbf8SYan Zheng sizeof(super->magic))) { 2060a512bbf8SYan Zheng brelse(bh); 2061a512bbf8SYan Zheng continue; 2062a512bbf8SYan Zheng } 2063a512bbf8SYan Zheng 2064a512bbf8SYan Zheng if (!latest || btrfs_super_generation(super) > transid) { 2065a512bbf8SYan Zheng brelse(latest); 2066a512bbf8SYan Zheng latest = bh; 2067a512bbf8SYan Zheng transid = btrfs_super_generation(super); 2068a512bbf8SYan Zheng } else { 2069a512bbf8SYan Zheng brelse(bh); 2070a512bbf8SYan Zheng } 2071a512bbf8SYan Zheng } 2072a512bbf8SYan Zheng return latest; 2073a512bbf8SYan Zheng } 2074a512bbf8SYan Zheng 20754eedeb75SHisashi Hifumi /* 20764eedeb75SHisashi Hifumi * this should be called twice, once with wait == 0 and 20774eedeb75SHisashi Hifumi * once with wait == 1. When wait == 0 is done, all the buffer heads 20784eedeb75SHisashi Hifumi * we write are pinned. 20794eedeb75SHisashi Hifumi * 20804eedeb75SHisashi Hifumi * They are released when wait == 1 is done. 20814eedeb75SHisashi Hifumi * max_mirrors must be the same for both runs, and it indicates how 20824eedeb75SHisashi Hifumi * many supers on this one device should be written. 20834eedeb75SHisashi Hifumi * 20844eedeb75SHisashi Hifumi * max_mirrors == 0 means to write them all. 20854eedeb75SHisashi Hifumi */ 2086a512bbf8SYan Zheng static int write_dev_supers(struct btrfs_device *device, 2087a512bbf8SYan Zheng struct btrfs_super_block *sb, 2088a512bbf8SYan Zheng int do_barriers, int wait, int max_mirrors) 2089a512bbf8SYan Zheng { 2090a512bbf8SYan Zheng struct buffer_head *bh; 2091a512bbf8SYan Zheng int i; 2092a512bbf8SYan Zheng int ret; 2093a512bbf8SYan Zheng int errors = 0; 2094a512bbf8SYan Zheng u32 crc; 2095a512bbf8SYan Zheng u64 bytenr; 2096a512bbf8SYan Zheng int last_barrier = 0; 2097a512bbf8SYan Zheng 2098a512bbf8SYan Zheng if (max_mirrors == 0) 2099a512bbf8SYan Zheng max_mirrors = BTRFS_SUPER_MIRROR_MAX; 2100a512bbf8SYan Zheng 2101a512bbf8SYan Zheng /* make sure only the last submit_bh does a barrier */ 2102a512bbf8SYan Zheng if (do_barriers) { 2103a512bbf8SYan Zheng for (i = 0; i < max_mirrors; i++) { 2104a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2105a512bbf8SYan Zheng if (bytenr + BTRFS_SUPER_INFO_SIZE >= 2106a512bbf8SYan Zheng device->total_bytes) 2107a512bbf8SYan Zheng break; 2108a512bbf8SYan Zheng last_barrier = i; 2109a512bbf8SYan Zheng } 2110a512bbf8SYan Zheng } 2111a512bbf8SYan Zheng 2112a512bbf8SYan Zheng for (i = 0; i < max_mirrors; i++) { 2113a512bbf8SYan Zheng bytenr = btrfs_sb_offset(i); 2114a512bbf8SYan Zheng if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) 2115a512bbf8SYan Zheng break; 2116a512bbf8SYan Zheng 2117a512bbf8SYan Zheng if (wait) { 2118a512bbf8SYan Zheng bh = __find_get_block(device->bdev, bytenr / 4096, 2119a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 2120a512bbf8SYan Zheng BUG_ON(!bh); 2121a512bbf8SYan Zheng wait_on_buffer(bh); 21224eedeb75SHisashi Hifumi if (!buffer_uptodate(bh)) 21234eedeb75SHisashi Hifumi errors++; 21244eedeb75SHisashi Hifumi 21254eedeb75SHisashi Hifumi /* drop our reference */ 21264eedeb75SHisashi Hifumi brelse(bh); 21274eedeb75SHisashi Hifumi 21284eedeb75SHisashi Hifumi /* drop the reference from the wait == 0 run */ 2129a512bbf8SYan Zheng brelse(bh); 2130a512bbf8SYan Zheng continue; 2131a512bbf8SYan Zheng } else { 2132a512bbf8SYan Zheng btrfs_set_super_bytenr(sb, bytenr); 2133a512bbf8SYan Zheng 2134a512bbf8SYan Zheng crc = ~(u32)0; 2135a512bbf8SYan Zheng crc = btrfs_csum_data(NULL, (char *)sb + 2136a512bbf8SYan Zheng BTRFS_CSUM_SIZE, crc, 2137a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE - 2138a512bbf8SYan Zheng BTRFS_CSUM_SIZE); 2139a512bbf8SYan Zheng btrfs_csum_final(crc, sb->csum); 2140a512bbf8SYan Zheng 21414eedeb75SHisashi Hifumi /* 21424eedeb75SHisashi Hifumi * one reference for us, and we leave it for the 21434eedeb75SHisashi Hifumi * caller 21444eedeb75SHisashi Hifumi */ 2145a512bbf8SYan Zheng bh = __getblk(device->bdev, bytenr / 4096, 2146a512bbf8SYan Zheng BTRFS_SUPER_INFO_SIZE); 2147a512bbf8SYan Zheng memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 2148a512bbf8SYan Zheng 21494eedeb75SHisashi Hifumi /* one reference for submit_bh */ 2150a512bbf8SYan Zheng get_bh(bh); 21514eedeb75SHisashi Hifumi 21524eedeb75SHisashi Hifumi set_buffer_uptodate(bh); 2153a512bbf8SYan Zheng lock_buffer(bh); 2154a512bbf8SYan Zheng bh->b_end_io = btrfs_end_buffer_write_sync; 2155a512bbf8SYan Zheng } 2156a512bbf8SYan Zheng 2157a512bbf8SYan Zheng if (i == last_barrier && do_barriers && device->barriers) { 2158a512bbf8SYan Zheng ret = submit_bh(WRITE_BARRIER, bh); 2159a512bbf8SYan Zheng if (ret == -EOPNOTSUPP) { 2160a512bbf8SYan Zheng printk("btrfs: disabling barriers on dev %s\n", 2161a512bbf8SYan Zheng device->name); 2162a512bbf8SYan Zheng set_buffer_uptodate(bh); 2163a512bbf8SYan Zheng device->barriers = 0; 21644eedeb75SHisashi Hifumi /* one reference for submit_bh */ 2165a512bbf8SYan Zheng get_bh(bh); 2166a512bbf8SYan Zheng lock_buffer(bh); 2167ffbd517dSChris Mason ret = submit_bh(WRITE_SYNC, bh); 2168a512bbf8SYan Zheng } 2169a512bbf8SYan Zheng } else { 2170ffbd517dSChris Mason ret = submit_bh(WRITE_SYNC, bh); 2171a512bbf8SYan Zheng } 2172a512bbf8SYan Zheng 21734eedeb75SHisashi Hifumi if (ret) 2174a512bbf8SYan Zheng errors++; 2175a512bbf8SYan Zheng } 2176a512bbf8SYan Zheng return errors < i ? 0 : -1; 2177a512bbf8SYan Zheng } 2178a512bbf8SYan Zheng 2179a512bbf8SYan Zheng int write_all_supers(struct btrfs_root *root, int max_mirrors) 2180f2984462SChris Mason { 2181e5e9a520SChris Mason struct list_head *head; 2182f2984462SChris Mason struct btrfs_device *dev; 2183a061fc8dSChris Mason struct btrfs_super_block *sb; 2184f2984462SChris Mason struct btrfs_dev_item *dev_item; 2185f2984462SChris Mason int ret; 2186f2984462SChris Mason int do_barriers; 2187a236aed1SChris Mason int max_errors; 2188a236aed1SChris Mason int total_errors = 0; 2189a061fc8dSChris Mason u64 flags; 2190f2984462SChris Mason 2191a236aed1SChris Mason max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; 2192f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 2193f2984462SChris Mason 2194a061fc8dSChris Mason sb = &root->fs_info->super_for_commit; 2195a061fc8dSChris Mason dev_item = &sb->dev_item; 2196e5e9a520SChris Mason 2197e5e9a520SChris Mason mutex_lock(&root->fs_info->fs_devices->device_list_mutex); 2198e5e9a520SChris Mason head = &root->fs_info->fs_devices->devices; 2199c6e30871SQinghuang Feng list_for_each_entry(dev, head, dev_list) { 2200dfe25020SChris Mason if (!dev->bdev) { 2201dfe25020SChris Mason total_errors++; 2202dfe25020SChris Mason continue; 2203dfe25020SChris Mason } 22042b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 2205dfe25020SChris Mason continue; 2206dfe25020SChris Mason 22072b82032cSYan Zheng btrfs_set_stack_device_generation(dev_item, 0); 2208a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 2209a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 2210a061fc8dSChris Mason btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); 2211a061fc8dSChris Mason btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); 2212a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 2213a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 2214a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 2215a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 22162b82032cSYan Zheng memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 2217a512bbf8SYan Zheng 2218a061fc8dSChris Mason flags = btrfs_super_flags(sb); 2219a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 2220f2984462SChris Mason 2221a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); 2222a236aed1SChris Mason if (ret) 2223a236aed1SChris Mason total_errors++; 2224f2984462SChris Mason } 2225a236aed1SChris Mason if (total_errors > max_errors) { 2226d397712bSChris Mason printk(KERN_ERR "btrfs: %d errors while writing supers\n", 2227d397712bSChris Mason total_errors); 2228a236aed1SChris Mason BUG(); 2229a236aed1SChris Mason } 2230f2984462SChris Mason 2231a512bbf8SYan Zheng total_errors = 0; 2232c6e30871SQinghuang Feng list_for_each_entry(dev, head, dev_list) { 2233dfe25020SChris Mason if (!dev->bdev) 2234dfe25020SChris Mason continue; 22352b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 2236dfe25020SChris Mason continue; 2237dfe25020SChris Mason 2238a512bbf8SYan Zheng ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); 2239a512bbf8SYan Zheng if (ret) 22401259ab75SChris Mason total_errors++; 2241f2984462SChris Mason } 2242e5e9a520SChris Mason mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); 2243a236aed1SChris Mason if (total_errors > max_errors) { 2244d397712bSChris Mason printk(KERN_ERR "btrfs: %d errors while writing supers\n", 2245d397712bSChris Mason total_errors); 2246a236aed1SChris Mason BUG(); 2247a236aed1SChris Mason } 2248f2984462SChris Mason return 0; 2249f2984462SChris Mason } 2250f2984462SChris Mason 2251a512bbf8SYan Zheng int write_ctree_super(struct btrfs_trans_handle *trans, 2252a512bbf8SYan Zheng struct btrfs_root *root, int max_mirrors) 2253cfaa7295SChris Mason { 2254e66f709bSChris Mason int ret; 22552c90e5d6SChris Mason 2256a512bbf8SYan Zheng ret = write_all_supers(root, max_mirrors); 22575f39d397SChris Mason return ret; 2258cfaa7295SChris Mason } 2259cfaa7295SChris Mason 22605eda7b5eSChris Mason int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) 22612619ba1fSChris Mason { 22624df27c4dSYan, Zheng spin_lock(&fs_info->fs_roots_radix_lock); 22632619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 22642619ba1fSChris Mason (unsigned long)root->root_key.objectid); 22654df27c4dSYan, Zheng spin_unlock(&fs_info->fs_roots_radix_lock); 22664df27c4dSYan, Zheng free_fs_root(root); 22674df27c4dSYan, Zheng return 0; 22684df27c4dSYan, Zheng } 22694df27c4dSYan, Zheng 22704df27c4dSYan, Zheng static void free_fs_root(struct btrfs_root *root) 22714df27c4dSYan, Zheng { 22724df27c4dSYan, Zheng WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); 22733394e160SChris Mason if (root->anon_super.s_dev) { 22743394e160SChris Mason down_write(&root->anon_super.s_umount); 22753394e160SChris Mason kill_anon_super(&root->anon_super); 22763394e160SChris Mason } 22775f39d397SChris Mason free_extent_buffer(root->node); 22785f39d397SChris Mason free_extent_buffer(root->commit_root); 227958176a96SJosef Bacik kfree(root->name); 22802619ba1fSChris Mason kfree(root); 22812619ba1fSChris Mason } 22822619ba1fSChris Mason 228335b7e476SChris Mason static int del_fs_roots(struct btrfs_fs_info *fs_info) 22840f7d52f4SChris Mason { 22850f7d52f4SChris Mason int ret; 22860f7d52f4SChris Mason struct btrfs_root *gang[8]; 22870f7d52f4SChris Mason int i; 22880f7d52f4SChris Mason 22890f7d52f4SChris Mason while (1) { 22900f7d52f4SChris Mason ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 22910f7d52f4SChris Mason (void **)gang, 0, 22920f7d52f4SChris Mason ARRAY_SIZE(gang)); 22930f7d52f4SChris Mason if (!ret) 22940f7d52f4SChris Mason break; 22952619ba1fSChris Mason for (i = 0; i < ret; i++) 22965eda7b5eSChris Mason btrfs_free_fs_root(fs_info, gang[i]); 22970f7d52f4SChris Mason } 22980f7d52f4SChris Mason return 0; 22990f7d52f4SChris Mason } 2300b4100d64SChris Mason 2301c146afadSYan Zheng int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) 2302c146afadSYan Zheng { 2303c146afadSYan Zheng u64 root_objectid = 0; 2304c146afadSYan Zheng struct btrfs_root *gang[8]; 2305c146afadSYan Zheng int i; 2306c146afadSYan Zheng int ret; 2307c146afadSYan Zheng 2308c146afadSYan Zheng while (1) { 2309c146afadSYan Zheng ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 2310c146afadSYan Zheng (void **)gang, root_objectid, 2311c146afadSYan Zheng ARRAY_SIZE(gang)); 2312c146afadSYan Zheng if (!ret) 2313c146afadSYan Zheng break; 23145d4f98a2SYan Zheng 23155d4f98a2SYan Zheng root_objectid = gang[ret - 1]->root_key.objectid + 1; 2316c146afadSYan Zheng for (i = 0; i < ret; i++) { 2317c146afadSYan Zheng root_objectid = gang[i]->root_key.objectid; 2318c146afadSYan Zheng ret = btrfs_find_dead_roots(fs_info->tree_root, 23195d4f98a2SYan Zheng root_objectid); 2320c146afadSYan Zheng BUG_ON(ret); 2321c146afadSYan Zheng btrfs_orphan_cleanup(gang[i]); 2322c146afadSYan Zheng } 2323c146afadSYan Zheng root_objectid++; 2324c146afadSYan Zheng } 2325c146afadSYan Zheng return 0; 2326c146afadSYan Zheng } 2327c146afadSYan Zheng 2328c146afadSYan Zheng int btrfs_commit_super(struct btrfs_root *root) 2329c146afadSYan Zheng { 2330c146afadSYan Zheng struct btrfs_trans_handle *trans; 2331c146afadSYan Zheng int ret; 2332c146afadSYan Zheng 2333c146afadSYan Zheng mutex_lock(&root->fs_info->cleaner_mutex); 2334c146afadSYan Zheng btrfs_clean_old_snapshots(root); 2335c146afadSYan Zheng mutex_unlock(&root->fs_info->cleaner_mutex); 2336c146afadSYan Zheng trans = btrfs_start_transaction(root, 1); 2337c146afadSYan Zheng ret = btrfs_commit_transaction(trans, root); 2338c146afadSYan Zheng BUG_ON(ret); 2339c146afadSYan Zheng /* run commit again to drop the original snapshot */ 2340c146afadSYan Zheng trans = btrfs_start_transaction(root, 1); 2341c146afadSYan Zheng btrfs_commit_transaction(trans, root); 2342c146afadSYan Zheng ret = btrfs_write_and_wait_transaction(NULL, root); 2343c146afadSYan Zheng BUG_ON(ret); 2344c146afadSYan Zheng 2345a512bbf8SYan Zheng ret = write_ctree_super(NULL, root, 0); 2346c146afadSYan Zheng return ret; 2347c146afadSYan Zheng } 2348c146afadSYan Zheng 2349e20d96d6SChris Mason int close_ctree(struct btrfs_root *root) 2350eb60ceacSChris Mason { 23510f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 2352c146afadSYan Zheng int ret; 2353e089f05cSChris Mason 2354facda1e7SChris Mason fs_info->closing = 1; 2355a2135011SChris Mason smp_mb(); 2356a2135011SChris Mason 2357a74a4b97SChris Mason kthread_stop(root->fs_info->transaction_kthread); 2358a74a4b97SChris Mason kthread_stop(root->fs_info->cleaner_kthread); 2359a74a4b97SChris Mason 2360c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 2361c146afadSYan Zheng ret = btrfs_commit_super(root); 2362d397712bSChris Mason if (ret) 2363d397712bSChris Mason printk(KERN_ERR "btrfs: commit super ret %d\n", ret); 2364c146afadSYan Zheng } 2365ed2ff2cbSChris Mason 2366f25784b3SYan Zheng fs_info->closing = 2; 2367f25784b3SYan Zheng smp_mb(); 2368f25784b3SYan Zheng 2369b0c68f8bSChris Mason if (fs_info->delalloc_bytes) { 2370d397712bSChris Mason printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n", 237121380931SJoel Becker (unsigned long long)fs_info->delalloc_bytes); 2372b0c68f8bSChris Mason } 237331153d81SYan Zheng if (fs_info->total_ref_cache_size) { 2374d397712bSChris Mason printk(KERN_INFO "btrfs: at umount reference cache size %llu\n", 2375d397712bSChris Mason (unsigned long long)fs_info->total_ref_cache_size); 237631153d81SYan Zheng } 237731153d81SYan Zheng 23785f39d397SChris Mason free_extent_buffer(fs_info->extent_root->node); 23795d4f98a2SYan Zheng free_extent_buffer(fs_info->extent_root->commit_root); 23805f39d397SChris Mason free_extent_buffer(fs_info->tree_root->node); 23815d4f98a2SYan Zheng free_extent_buffer(fs_info->tree_root->commit_root); 23820b86a832SChris Mason free_extent_buffer(root->fs_info->chunk_root->node); 23835d4f98a2SYan Zheng free_extent_buffer(root->fs_info->chunk_root->commit_root); 23840b86a832SChris Mason free_extent_buffer(root->fs_info->dev_root->node); 23855d4f98a2SYan Zheng free_extent_buffer(root->fs_info->dev_root->commit_root); 2386d20f7043SChris Mason free_extent_buffer(root->fs_info->csum_root->node); 23875d4f98a2SYan Zheng free_extent_buffer(root->fs_info->csum_root->commit_root); 2388d20f7043SChris Mason 23899078a3e1SChris Mason btrfs_free_block_groups(root->fs_info); 2390c146afadSYan Zheng 23910f7d52f4SChris Mason del_fs_roots(fs_info); 2392d10c5f31SChris Mason 2393c146afadSYan Zheng iput(fs_info->btree_inode); 23949ad6b7bcSChris Mason 2395247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 2396771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 23978b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 23988b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 2399d20f7043SChris Mason btrfs_stop_workers(&fs_info->endio_meta_workers); 2400cad321adSChris Mason btrfs_stop_workers(&fs_info->endio_meta_write_workers); 2401e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 24021cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 2403d6bfde87SChris Mason 2404dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 24050b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 2406b248a415SChris Mason 240704160088SChris Mason bdi_destroy(&fs_info->bdi); 24080b86a832SChris Mason 24090f7d52f4SChris Mason kfree(fs_info->extent_root); 24100f7d52f4SChris Mason kfree(fs_info->tree_root); 24110b86a832SChris Mason kfree(fs_info->chunk_root); 24120b86a832SChris Mason kfree(fs_info->dev_root); 2413d20f7043SChris Mason kfree(fs_info->csum_root); 2414eb60ceacSChris Mason return 0; 2415eb60ceacSChris Mason } 2416eb60ceacSChris Mason 24171259ab75SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) 2418ccd467d6SChris Mason { 24191259ab75SChris Mason int ret; 2420810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 24211259ab75SChris Mason 24221259ab75SChris Mason ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf); 24231259ab75SChris Mason if (!ret) 24241259ab75SChris Mason return ret; 24251259ab75SChris Mason 24261259ab75SChris Mason ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, 24271259ab75SChris Mason parent_transid); 24281259ab75SChris Mason return !ret; 24295f39d397SChris Mason } 24306702ed49SChris Mason 24315f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 24325f39d397SChris Mason { 2433810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 2434d1310b2eSChris Mason return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, 24355f39d397SChris Mason buf); 24365f39d397SChris Mason } 24375f39d397SChris Mason 24385f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 24395f39d397SChris Mason { 2440810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 24415f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 24425f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 2443b9473439SChris Mason int was_dirty; 2444b4ce94deSChris Mason 2445b9447ef8SChris Mason btrfs_assert_tree_locked(buf); 2446ccd467d6SChris Mason if (transid != root->fs_info->generation) { 2447d397712bSChris Mason printk(KERN_CRIT "btrfs transid mismatch buffer %llu, " 2448d397712bSChris Mason "found %llu running %llu\n", 2449db94535dSChris Mason (unsigned long long)buf->start, 2450d397712bSChris Mason (unsigned long long)transid, 2451d397712bSChris Mason (unsigned long long)root->fs_info->generation); 2452ccd467d6SChris Mason WARN_ON(1); 2453ccd467d6SChris Mason } 2454b9473439SChris Mason was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 2455b9473439SChris Mason buf); 2456b9473439SChris Mason if (!was_dirty) { 2457b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 2458b9473439SChris Mason root->fs_info->dirty_metadata_bytes += buf->len; 2459b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 2460b9473439SChris Mason } 2461eb60ceacSChris Mason } 2462eb60ceacSChris Mason 2463d3c2fdcfSChris Mason void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 246435b7e476SChris Mason { 2465188de649SChris Mason /* 2466188de649SChris Mason * looks as though older kernels can get into trouble with 2467188de649SChris Mason * this code, they end up stuck in balance_dirty_pages forever 2468188de649SChris Mason */ 2469d6bfde87SChris Mason u64 num_dirty; 2470771ed689SChris Mason unsigned long thresh = 32 * 1024 * 1024; 2471d6bfde87SChris Mason 24726933c02eSJens Axboe if (current->flags & PF_MEMALLOC) 2473d6bfde87SChris Mason return; 2474d6bfde87SChris Mason 2475585ad2c3SChris Mason num_dirty = root->fs_info->dirty_metadata_bytes; 2476585ad2c3SChris Mason 2477d6bfde87SChris Mason if (num_dirty > thresh) { 2478d3c2fdcfSChris Mason balance_dirty_pages_ratelimited_nr( 2479304fced6SChris Mason root->fs_info->btree_inode->i_mapping, 1); 248035b7e476SChris Mason } 2481188de649SChris Mason return; 2482d6bfde87SChris Mason } 24836b80053dSChris Mason 2484ca7a79adSChris Mason int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 24856b80053dSChris Mason { 2486810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 2487ce9adaa5SChris Mason int ret; 2488ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 2489d397712bSChris Mason if (ret == 0) 2490b4ce94deSChris Mason set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); 2491ce9adaa5SChris Mason return ret; 24926b80053dSChris Mason } 24930da5468fSChris Mason 24944bef0848SChris Mason int btree_lock_page_hook(struct page *page) 24954bef0848SChris Mason { 24964bef0848SChris Mason struct inode *inode = page->mapping->host; 2497b9473439SChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 24984bef0848SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 24994bef0848SChris Mason struct extent_buffer *eb; 25004bef0848SChris Mason unsigned long len; 25014bef0848SChris Mason u64 bytenr = page_offset(page); 25024bef0848SChris Mason 25034bef0848SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 25044bef0848SChris Mason goto out; 25054bef0848SChris Mason 25064bef0848SChris Mason len = page->private >> 2; 25074bef0848SChris Mason eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS); 25084bef0848SChris Mason if (!eb) 25094bef0848SChris Mason goto out; 25104bef0848SChris Mason 25114bef0848SChris Mason btrfs_tree_lock(eb); 25124bef0848SChris Mason btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); 2513b9473439SChris Mason 2514b9473439SChris Mason if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { 2515b9473439SChris Mason spin_lock(&root->fs_info->delalloc_lock); 2516b9473439SChris Mason if (root->fs_info->dirty_metadata_bytes >= eb->len) 2517b9473439SChris Mason root->fs_info->dirty_metadata_bytes -= eb->len; 2518b9473439SChris Mason else 2519b9473439SChris Mason WARN_ON(1); 2520b9473439SChris Mason spin_unlock(&root->fs_info->delalloc_lock); 2521b9473439SChris Mason } 2522b9473439SChris Mason 25234bef0848SChris Mason btrfs_tree_unlock(eb); 25244bef0848SChris Mason free_extent_buffer(eb); 25254bef0848SChris Mason out: 25264bef0848SChris Mason lock_page(page); 25274bef0848SChris Mason return 0; 25284bef0848SChris Mason } 25294bef0848SChris Mason 2530d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops = { 25314bef0848SChris Mason .write_cache_pages_lock_hook = btree_lock_page_hook, 2532ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 25330b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 2534239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 2535239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 25360da5468fSChris Mason }; 2537