mkfs: allow users to configure the desired maximum atomic write size

Allow callers of mkfs.xfs to specify a desired maximum atomic write
size.  This value will cause the log size to be adjusted to support
software atomic writes, and the AG size to be aligned to support
hardware atomic writes.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: John Garry <john.g.garry@oracle.com>
4 files changed