xfs: reserve AG space for the refcount btree root
authorDarrick J. Wong <darrick.wong@oracle.com>
Mon, 3 Oct 2016 16:11:24 +0000 (09:11 -0700)
committerDarrick J. Wong <darrick.wong@oracle.com>
Mon, 3 Oct 2016 16:11:24 +0000 (09:11 -0700)
commitd0e853f3600cd2a3f7c4a067dc38155c77c51df9
tree78dbdb0332cb24d52e9931befa292b90a8719983
parenta90c00f05554e3a305cc2f4836e065368709926f
xfs: reserve AG space for the refcount btree root

Reduce the max AG usable space size so that we always have space for
the refcount btree root.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
fs/xfs/libxfs/xfs_alloc.c