Re: bcache-3.2 branch

On 10 July 2012 01:57, Kent Overstreet [off-list ref] wrote:

On Wed, Jun 20, 2012 at 10:08:51PM +1000, Joseph Glanville wrote:

quoted

Hi Kent and list,

I have pulled down the latest bcache code and have been playing around
with it when I noticed that I am having issues starting Xen virtual
machines using bcache + LVM.
What is interesting is the QEMU storage emulation in userspace is able
to access the device fine however blkback kernel module which uses the
device directly seems to fail.
How would I go about debugging any of this?

Older versions of bcache work fine so it's a regression as far as I can tell.

Hey, sorry for the delay - I just got back from my first sort-of
vacation in... awhile :P

I'm pretty sure I know the approximate source of the regression - I
fairly recently reworked some code in the generic block layer to handle
arbitrary size bios (which enabled some major cleanups in the bcache
code). I've chased down a few bugs with that code since then.

Got some logs for me to look at? Or did you want me to give you pointers
on debugging kernel code? :)

A few pointers would be great. :)

Also how do I best get it to do a really verbose log that I can use to
help you track down bugs?

quoted

Joseph.

--
CTO | Orion Virtualisation Solutions | www.orionvm.com.au
Phone: 1300 56 99 52 | Mobile: 0428 754 846

Cheers,
Joseph.

-- 
CTO | Orion Virtualisation Solutions | www.orionvm.com.au
Phone: 1300 56 99 52 | Mobile: 0428 754 846