xfs_db: improve getting and setting extended attributes

Add an attr_get command to retrieve the value of an xattr from a file;
and extend the attr_set command to allow passing of string values.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Dave Chinner <dchinner@redhat.com>
2 files changed