Btrfs: fix cluster alignment for mount -o ssd
With the new raid56 code, we want to make sure we're
properly aligning our allocation clusters with -o ssd
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 3345f68..f1340210 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5715,6 +5715,7 @@
* lets look there
*/
if (last_ptr) {
+ unsigned long aligned_cluster;
/*
* the refill lock keeps out other
* people trying to start a new cluster
@@ -5781,11 +5782,15 @@
goto unclustered_alloc;
}
+ aligned_cluster = max_t(unsigned long,
+ empty_cluster + empty_size,
+ block_group->full_stripe_len);
+
/* allocate a cluster in this block group */
ret = btrfs_find_space_cluster(trans, root,
block_group, last_ptr,
search_start, num_bytes,
- empty_cluster + empty_size);
+ aligned_cluster);
if (ret == 0) {
/*
* now pull our allocation out of this
