When multipath is enabled and friendly names are ON and we try
to extend a volume, we pass the SCSI WWID to the multipath_resize_map
method which is not correct.
There are 2 things we can pass to the multipathd resize map command:
1) Multipath device (eg: dm-0)
2) Alias (eg: mpath1) or UUID (eg: 36005076303ffc56200000000000010aa)
The value should be an alias (mpath1) when friendly names are ON
and UUID (36005076303ffc56200000000000010aa) when friendly names
are OFF. However, we only pass the UUID irrespective of the value
set for friendly names.
This patch passes the multipath device path (to multipathd resize
map command) which is the real path of the multipath device (/dev/dm-*).
This fixes the issue as it passes the same value irrespective of if
the friendly names are ON or OFF.
-> self.multipath_resize_map(os.path.realpath(mpath_device))
(Pdb) mpath_device
'/dev/disk/by-id/dm-uuid-mpath-3600140522774ce73be84f9cb9537e0c9'
(Pdb) os.path.realpath(mpath_device)
'/dev/dm-5'
Closes-Bug: 1609753
Change-Id: I1c60af19c2ebaa9de878cd07cfc0077c5ea56fe3
75714711f2