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https://bugzilla.redhat.com/show_bug.cgi?id=1265694 Commit id '020135dc' didn't quite get the algorithm correct when a device mapper source ended with a non numeric value (e.g. ends with an alphabet value). This patch modifies the 'part_separator' logic to add the "p" separator to the attempted target path name only when specified as part_separator='yes'. For a source name that already ends with a number, the logic doesn't change as the part separator would need to be there. For a source name that ends with something other than a number, this allows the possibility that a "p" separator can be added. The default for one of these source devices is to not add the separator. The key for device mapper and the need for a partition separator "p" is the presence of a number in the last character of the device name link in /dev/mapper. A name such as "/dev/mapper/mpatha1" would generate a "/dev/mapper/mpatha1p1" partition, while "/dev/mapper/mpatha" would generate partition "/dev/mapper/mpatha1". Similarly for a device mapper entry not using friendly names or an alias, a device such as "/dev/mapper/3600a0b80005b10ca00005ad656fd8d93" would generate a paritition "/dev/mapper/3600a0b80005b10ca00005ad656fd8d93p1", while a device such as "/dev/mapper/3600a0b80005b10ca00005e115729093f" would generate a partition "/dev/mapper/3600a0b80005b10ca00005e115729093f1". The long number is the WWID of the device. It's also possible to assign an alias for a device mapper entry, that alias follows the same rules with respect to ending with a number or not when adding a "p" to create the target device path.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>