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Btrfs: Protect the readonly flag of block group

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The access for ro in btrfs_block_group_cache should be protected
because of the racy lock in relocation.

Signed-off-by: Wu Bo <wu.bo@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
WuBo 2011-07-26 03:30:11 +00:00 committed by Chris Mason
parent 1bf85046e4
commit 61cfea9bb8
1 changed files with 7 additions and 3 deletions
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10
fs/btrfs/extent-tree.c
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@ -6549,8 +6549,6 @@ static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force)
u64 min_allocable_bytes;
int ret = -ENOSPC;
if (cache->ro)
return 0;
/*
* We need some metadata space and system metadata space for
@ -6566,6 +6564,12 @@ static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force)
spin_lock(&sinfo->lock);
spin_lock(&cache->lock);
if (cache->ro) {
ret = 0;
goto out;
}
num_bytes = cache->key.offset - cache->reserved - cache->pinned -
cache->bytes_super - btrfs_block_group_used(&cache->item);
@ -6579,7 +6583,7 @@ static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force)
cache->ro = 1;
ret = 0;
}
out:
spin_unlock(&cache->lock);
spin_unlock(&sinfo->lock);
return ret;