Re: Revert "dm raid: remove unnecessary discard limits for raid10"

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> On Dec 9, 2020, at 2:36 PM, Mike Snitzer <snitzer@xxxxxxxxxx> wrote:
> 
> On Wed, Dec 09 2020 at  4:58pm -0500,
> Song Liu <songliubraving@xxxxxx> wrote:
> 
>> This reverts commit f0e90b6c663a7e3b4736cb318c6c7c589f152c28.
>> 
>> Matthew Ruffell reported data corruption in raid10 due to the changes
>> in discard handling [1]. Revert these changes before we find a proper fix.
>> 
>> [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1907262/ 
>> Cc: Matthew Ruffell <matthew.ruffell@xxxxxxxxxxxxx>
>> Cc: Xiao Ni <xni@xxxxxxxxxx>
>> Cc: Mike Snitzer <snitzer@xxxxxxxxxx>
>> Signed-off-by: Song Liu <songliubraving@xxxxxx>
> 
> If you're reverting all the MD code that enabled this DM change, then
> obviously the DM change must be reverted too.  But please do _not_
> separate the DM revert from the MD reverts.

Good point! I should have thought about it through. 

Thanks,
Song

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