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Btrfs: fix sleep with spinlock held during unmount 

The code to free block groups needs to drop the space info spin lock
before calling btrfs_remove_free_space_cache (which can schedule).

This is safe because at unmount time, nobody else is going to play
with the block groups.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-09-24 12:50:10 -04:00
parent 2b1f55b0f0
commit 4434c33c7f
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/extent-tree.c
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@ -3157,9 +3157,13 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
block_group = rb_entry(n, struct btrfs_block_group_cache,
cache_node);
spin_unlock(&info->block_group_cache_lock);
btrfs_remove_free_space_cache(block_group);
spin_lock(&info->block_group_cache_lock);
rb_erase(&block_group->cache_node,
&info->block_group_cache_tree);
spin_lock(&block_group->space_info->lock);
list_del(&block_group->list);
spin_unlock(&block_group->space_info->lock);