linux-kernel - Re: block: re-add discard_granularity and alignment checks

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Message-ID: <CAF1ivSapbRDuQX5iW5MyC=YWiu0poKoFhVKRcut+rLR1fsv2iQ@mail.gmail.com>
Date:	Tue, 27 Oct 2015 14:23:56 -0700
From:	Ming Lin <mlin@...nel.org>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Kent Overstreet <kent.overstreet@...il.com>
Subject: Re: block: re-add discard_granularity and alignment checks

On Thu, Oct 22, 2015 at 10:03 AM, Mike Snitzer <snitzer@...hat.com> wrote:
> On Thu, Oct 22 2015 at 12:59pm -0400,
> Ming Lin <mlin@...nel.org> wrote:
>
>> From: Ming Lin <ming.l@....samsung.com>
>>
>> In commit b49a087("block: remove split code in
>> blkdev_issue_{discard,write_same}"), discard_granularity and alignment
>> checks were removed. Ideally, with bio late splitting, the upper layers
>> shouldn't need to depend on device's limits.
>>
>> Christoph reported a discard regression on the HGST Ultrastar SN100 NVMe
>> device when mkfs.xfs. We have not found the root cause yet.
>>
>> This patch re-adds discard_granularity and alignment checks by reverting
>> the related changes in commit b49a087. The good thing is now we can
>> remove the 2G discard size cap and just use UINT_MAX to avoid bi_size
>> overflow.
>>
>> Reviewed-by: Christoph Hellwig <hch@....de>
>> Tested-by: Christoph Hellwig <hch@....de>
>> Signed-off-by: Ming Lin <ming.l@....samsung.com>
>
> Reviewed-by: Mike Snitzer <snitzer@...hat.com>

Hi Jens,

Would you please take this one?

>
> Thanks!
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