Commit 357b9784 authored Jan 26, 2012 by Josef Bacik Committed by Chris Mason Jan 26, 2012

Btrfs: make sure a bitmap has enough bytes

We have only been checking for min_bytes available in bitmap entries, but we
won't successfully setup a bitmap cluster unless it has at least bytes in the
bitmap, so in the common case min_bytes is 4k and we want something like 2MB, so
if there are a bunch of bitmap entries with less than 2mb's in them, we'll
search all them anyway, which is suboptimal. Fix this check. Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

parent b1375d64

fs/btrfs/free-space-cache.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2475,7 +2475,7 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group,
		}

		list_for_each_entry(entry, bitmaps, list) {
		if (entry->bytes < min_bytes)
		if (entry->bytes < bytes)
		continue;
		ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset,
		bytes, cont1_bytes, min_bytes);