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[dm-devel] Determine partition prefix used for mpath devices



In a script, I need to somehow determine what prefix is being used for partitions as set by UDEV. It seems that the naming convention is in flux and could change frequently. When using user_friendly_names the prefix is set using kpartx within udev rules. My problem is I need to know what the prefix is so my scripts know what device naming convention to look for.

Here are the different iterations of naming schemes:

mpath0p1
mpath0-part1
mpathap1
mpatha-part1

Is there a way other than grepping through the udev rules to determine what the prefix is? The partitions may not exist so I cannot just look to see what they are. I need to know BEFORE I create partitions. I know this is a strange request, but I am working with a lot of code that was designed before multipath was available and using the sys naming is not an option (i.e. /disk/by-id/wwid).

Thanks in advance,
David


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