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Btrfs: check free space in block group before searching for a cluster 

The free space cluster stuff is heavy duty, so there is no sense in going
through the entire song and dance if there isn't enough space in the block group
to begin with.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik 2011-03-18 15:13:42 -04:00
parent 22a94d44bd
commit 7d0d2e8e6b
1 changed files with 10 additions and 0 deletions
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10
fs/btrfs/free-space-cache.c
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@ -1999,6 +1999,16 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
min_bytes = max(bytes, (bytes + empty_size) >> 2);
spin_lock(&block_group->tree_lock);
/*
* If we know we don't have enough space to make a cluster don't even
* bother doing all the work to try and find one.
*/
if (block_group->free_space < min_bytes) {
spin_unlock(&block_group->tree_lock);
return -ENOSPC;
}
spin_lock(&cluster->lock);
/* someone already found a cluster, hooray */