Btrfs: check free space in block group before searching for a cluster (7d0d2e8e) · Commits · 戴 / test

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>

fs/btrfs/free-space-cache.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -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 */

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