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Btrfs: fix locking issue in btrfs_remove_block_group 

We should hold the block_group_cache_lock while modifying the
block groups red-black tree. Thank you,

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
This commit is contained in:
Yan Zheng 2009-01-21 10:49:16 -05:00 committed by Chris Mason
parent c6e308713a
commit 3dfdb9348a
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/extent-tree.c
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@ -5952,9 +5952,11 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_remove_free_space_cache(block_group);
spin_lock(&root->fs_info->block_group_cache_lock);
rb_erase(&block_group->cache_node,
&root->fs_info->block_group_cache_tree);
spin_unlock(&root->fs_info->block_group_cache_lock);
btrfs_remove_free_space_cache(block_group);
down_write(&block_group->space_info->groups_sem);
list_del(&block_group->list);
up_write(&block_group->space_info->groups_sem);