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Btrfs: advance window_start if we're using a bitmap 

If we span a long area in a bitmap we could end up taking a lot of time
searching to the next free area if we're searching from the original
window_start, so advance window_start in order to make sure we don't do any
superficial searching.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Josef Bacik 2012-01-26 15:01:12 -05:00 committed by Chris Mason
parent 0c4e538bcc
commit 9b23062840
1 changed files with 1 additions and 0 deletions
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fs/btrfs/free-space-cache.c
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@ -2251,6 +2251,7 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
offset_index);
continue;
}
cluster->window_start += bytes;
} else {
ret = entry->offset;