[Drbd-dev] [PATCH 4/5] block: make blkdev_get/put() handle exclusive access

Tejun Heo tj at kernel.org
Tue Nov 9 11:18:05 CET 2010


On 11/03/2010 04:06 PM, Jan Kara wrote:
> On Mon 01-11-10 17:15:28, Tejun Heo wrote:
>   The patch looks OK to me as far as ext3, ext4, and reiserfs are
> concerned. One thing I wondered about when I looked at it - does someone
> use the 'mode' argument of the blkdev_put() function (well, apart from the
> exclusive flag)? Because I've looked at a few random disk ->release()
> functions and none of them used it...

Yeah, I thought about removing @mode and make blkdev_put() take
@holder for exclusive releases.  From what I can see, it doesn't seem
like any implementation cares but it's customary to have access to
@mode on ->release(), so I decided to keep it.  It's rather flaky as
there's no mechanism to check or enforce it tho.



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