[dm-devel] DM limits setup
Joe Thornber
thornber at redhat.com
Mon Jan 5 10:21:52 UTC 2015
On Wed, Dec 31, 2014 at 02:10:52PM -0800, Doug Dumitru wrote:
> Hello all,
>
> I have a test dm target module that I use to validate storage subsystems
> for data accuracy. It basically builds weak hashes for every sector of a
> device when written, and validates these hashes when the sector is read
> back. Ugly memory usage, but it is just a test tool.
>
> I can deploy this with an iterator target and it will take on the limits of
> the device underneath, or I can skip the iterator target and get limits at
> 2048 sectors. What I would like to do is set the limit manually. I know
> this is "really bad program design", but again, this is a test tool and not
> anything for production use.
>
> Can anyone point me at an example of where the limits are setup explicitly.
Hi Doug,
This sounds like a useful target for testing, any chance you could
post it here when you finish it please?
dm-thin does lots of tweaking of limits, so that's probably the best one to look at:
https://github.com/jthornber/linux-2.6/blob/thin-dev/drivers/md/dm-thin.c#L3707
- Joe
More information about the dm-devel
mailing list