[dm-devel] [PATCH] dm-log-writes: invalidate the bdev's for both of our devices

[Amir Goldstein]

On Tue, Nov 28, 2017 at 7:30 PM, Josef Bacik <josef at toxicpanda.com> wrote:
> From: Josef Bacik <jbacik at fb.com>
>
> Amir noticed that sometimes the xfstests using dm-log-writes would fail
> randomly but would work fine after trying again manually.  This is
> because dm-log-writes writes directly to the device, but the log replay
> tools read and write via the block device page cache.  Sometimes this
> resulted in stale data being in the block device's page cache which
> would result in random failures.  To handle this simply invalidate the
> block device page cache on destruction so any replay of the log device
> that follows will be forced to read the new real contents.
>
> Reported-and-tested-by: Amir Goldstein <amir73il at gmail.com>

I'm fine with the Reported-by, but let's wait a while with this patch so
I have more time to torture it.
The incidents I got even before the patch did not happen more than
a handful of times after running for a few days, so I need some more
days to validate the fix.
I had already sent you some weird output. Let's see what else comes
along.

Thanks,
Amir.