tree 4793789ea94ffec2c5169378fd6ed7228fb31eeb
parent 0e11e342bac31f51ea055b147d20f77b59b9dd2c
author Tejun Heo <tj@kernel.org> 1223897279 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1224226016 +0200

block: add partition attribute for partition number

With extended devt, finding out the partition number becomes a bit
more challenging as subtracting the minor number from that of the
parent device doesn't work anymore.  The only thing left is parsing
the partition name which is brittle and not exactly universal (some
have '-' between the device name and partition number while others
don't).  This patch introduced partition attribute which contains the
partition number of the device.  This should make finding partitions
and its index easier.

This problem and solution were suggested by H. Peter Anvin.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>