From: Mike Snitzer <snitzer@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: axboe@kernel.dk, martin.petersen@oracle.com,
James.Bottomley@suse.de, linux-kernel@vger.kernel.org,
dm-devel@redhat.com
Subject: Re: [PATCH, RFC] block: don't allocate a payload for discard request
Date: Sat, 19 Jun 2010 00:25:34 -0400 [thread overview]
Message-ID: <20100619042534.GA16217@redhat.com> (raw)
In-Reply-To: <20100618145942.GA1148@lst.de>
On Fri, Jun 18 2010 at 10:59am -0400,
Christoph Hellwig <hch@lst.de> wrote:
>
> Allocating a fixed payload for discard requests always was a horrible hack,
> and it's not coming to byte us when adding support for discard in DM/MD.
>
> So change the code to leave the allocation of a payload to the lowlevel
> driver. Unfortunately that means we'll need another hack, which allows
> us to update the various block layer length fields indicating that we
> have a payload. Instead of hiding this in sd.c, which we already partially
> do for UNMAP support add a documented helper in the core block layer for it.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Mike Snitzer <snitzer@redhat.com>
I've built on your patch to successfully implement discard support for
DM (this includes splitting discards that span targets; only the linear
and striped DM targets are supported so far).
The patchset is still a work in progress but is available here (against
2.6.34 at the moment):
http://people.redhat.com/msnitzer/patches/dm-discard/latest/
next prev parent reply other threads:[~2010-06-19 4:25 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-18 14:59 Christoph Hellwig
2010-06-19 4:25 ` Mike Snitzer [this message]
2010-06-22 18:00 ` Mike Snitzer
2010-06-26 19:56 ` [PATCH 1/2] block: fix leaks associated with discard request payload Mike Snitzer
2010-06-27 8:49 ` FUJITA Tomonori
2010-06-27 9:26 ` Christoph Hellwig
2010-06-27 10:01 ` FUJITA Tomonori
2010-06-27 10:35 ` FUJITA Tomonori
2010-06-27 11:07 ` Christoph Hellwig
2010-06-27 12:32 ` FUJITA Tomonori
2010-06-27 14:16 ` Mike Snitzer
2010-06-27 15:35 ` Christoph Hellwig
2010-06-27 16:23 ` FUJITA Tomonori
2010-06-27 15:33 ` Christoph Hellwig
2010-06-28 7:57 ` Christoph Hellwig
2010-06-28 8:14 ` FUJITA Tomonori
2010-06-28 8:18 ` Jens Axboe
2010-06-28 8:45 ` FUJITA Tomonori
2010-06-28 15:25 ` Christoph Hellwig
2010-06-30 11:55 ` FUJITA Tomonori
2010-07-01 4:21 ` FUJITA Tomonori
2010-06-27 9:38 ` Christoph Hellwig
2010-06-27 15:29 ` James Bottomley
2010-06-28 17:16 ` Martin K. Petersen
2010-06-29 8:00 ` Boaz Harrosh
2010-06-29 22:28 ` [dm-devel] " Mikulas Patocka
2010-06-29 23:03 ` James Bottomley
2010-06-29 23:51 ` Mike Snitzer
2010-06-30 0:11 ` [dm-devel] " Mikulas Patocka
2010-06-30 14:22 ` James Bottomley
2010-06-30 15:36 ` Mike Snitzer
2010-06-30 16:26 ` James Bottomley
2010-07-01 12:28 ` [dm-devel] " Mikulas Patocka
2010-07-01 12:46 ` Mike Snitzer
2010-07-01 14:03 ` Mikulas Patocka
2010-07-01 12:49 ` [dm-devel] " Alasdair G Kergon
2010-06-30 8:32 ` Boaz Harrosh
2010-06-30 8:42 ` Christoph Hellwig
2010-06-30 10:25 ` Boaz Harrosh
2010-06-30 10:41 ` Christoph Hellwig
2010-06-30 10:57 ` Boaz Harrosh
2010-06-30 12:18 ` Mike Snitzer
2010-06-26 19:56 ` [PATCH 2/2] block: defer the use of inline biovecs for discard requests Mike Snitzer
2010-06-27 9:39 ` Christoph Hellwig
2010-06-27 14:00 ` Mike Snitzer
2010-06-27 14:55 ` [PATCH 2/2 v2] " Mike Snitzer
2010-06-27 15:33 ` Christoph Hellwig
2010-06-28 10:33 ` [PATCH 2/2] " FUJITA Tomonori
2010-06-28 12:29 ` Mike Snitzer
2010-06-28 15:15 ` FUJITA Tomonori
2010-06-28 15:31 ` Mike Snitzer
2010-06-28 12:34 ` Jens Axboe
2010-06-28 12:37 ` Mike Snitzer
2010-06-28 12:41 ` Jens Axboe
2010-06-28 12:44 ` Christoph Hellwig
2010-06-28 12:49 ` Jens Axboe
2010-06-28 12:45 ` Mike Snitzer
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