[dm-devel] checkerloop checks too many devices

[Benjamin Marzinski <bmarzins redhat com>]

It seems that checkerloop isn't just checking the your multipathed devices.
It's checking all your devices.  Wouldn't it be more sensible to find out which
devices make up part of a multipathed device, and only check those?

Currently, when I start up multipathd, I getting this printed out:

Unknown switch: (null)
multipath v0.4.4 (16/04, 2005)
Usage: /sbin/multipath  [-v level] [-d] [-l] [-S]
                        [-p failover|multibus|group_by_serial|group_by_prio]
                        [device]

        -v level        verbosty level
           0                    no output
           1                    print created devmap names only
           2                    default verbosity
           3                    print debug information
        -d              dry run, do not create or update devmaps
        -l              list the current multipath topology
        -F              flush all multipath device maps
        -p policy       force all maps to specified policy :
           failover             1 path per priority group
           multibus             all paths in 1 priority group
           group_by_serial      1 priority group per serial
           group_by_prio        1 priority group per priority lvl
           group_by_node_name   1 priority group per target node

        device          limit scope to the device's multipath
                        (udev-style $DEVNAME reference, eg /dev/sdb
                        or major:minor or a device map name)

because checkerloop is trying to check the status of /dev/hda, which is not
multipathed.

-Ben