commit e56f81e0b01ef4e45292d8c1e19edd4d09724e14
author Christoph Hellwig <hch@lst.de> Thu Oct 15 14:10:50 2015 +0200
committer Mike Snitzer <snitzer@redhat.com> Sat Oct 31 19:05:59 2015 -0400
tree 68b1faed3589d00b7a473ce856532e321f9e4908
parent 47796938c46b943d157ac8a6f9ed4e3b98b83cf4

dm: refactor ioctl handling

This moves the call to blkdev_ioctl and the argument checking to DM core
code, and only leaves a callout to find the block device to operate on
in the targets.  This simplifies the code and allows us to pass through
ioctl-like command using other methods in the next patch.

Also split out a helper around calling the prepare_ioctl method that
will be reused for persistent reservation handling.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>