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>

parent ab6e2410

fs/btrfs/volumes.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -2249,6 +2249,12 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
		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;