Btrfs: make sure the chunk allocator doesn't create zero length chunks
A recent commit allowed for smaller chunks to be created, but didn't
make sure they were always bigger than a stripe. After some divides,
this led to zero length stripes.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 9bf1f58..b584e9a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2249,6 +2249,12 @@
if (!looped)
calc_size = max_t(u64, min_stripe_size, calc_size);
+ /*
+ * we're about to do_div by the stripe_len so lets make sure
+ * we end up with something bigger than a stripe
+ */
+ calc_size = max_t(u64, calc_size, stripe_len * 4);
+
do_div(calc_size, stripe_len);
calc_size *= stripe_len;