Btrfs: fix chunk allocate size calculation

Commit Message

Chris Mason April 6, 2010, 2:15 p.m. UTC

None

Patch

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 @@  again:
 	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;