linux-kernel - Re: [GIT PULL] Core block IO bits for 4.2

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Date:	Fri, 26 Jun 2015 08:05:35 +0000
From:	Junichi Nomura <j-nomura@...jp.nec.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	Christoph Hellwig <hch@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mike Snitzer <snitzer@...hat.com>, Jens Axboe <axboe@...com>
Subject: Re: [GIT PULL] Core block IO bits for 4.2

On 06/26/15 15:41, Linus Torvalds wrote:
> On Jun 25, 2015 23:17, "Junichi Nomura" <j-nomura@...jp.nec.com <mailto:j-nomura@...jp.nec.com>> wrote:
>> On 06/25/15 23:37, Jens Axboe wrote:
>> >       block, dm: don't copy bios for request clones
>>
>> this change should not be pushed to mainline yet.
> 
> Hmm. I merged all of Jens' pull requests today, so it's now in my tree. What do?

Then I think following 3 commits should be reverted.

2d76fff dm: cleanup methods that requeue requests
cbc4e3c dm: do not allocate any mempools for blk-mq request-based DM
5f1b670 block, dm: don't copy bios for request clones

Reverting 5f1b670 involves conflicts in drvers/md/dm.c for
these 2 hunks due to diff contexts difference.
It's ok to revert those changes ignoring the contexts.

  @@ -1089,8 +1038,6 @@ static void free_rq_clone(struct request *clone, bool must_be_mapped)
   
          WARN_ON_ONCE(must_be_mapped && !clone->q);
   
  -       blk_rq_unprep_clone(clone);
  -
          if (md->type == DM_TYPE_MQ_REQUEST_BASED)
                  /* stacked on blk-mq queue(s) */
                  tio->ti->type->release_clone_rq(clone);

  @@ -1973,11 +1889,7 @@ static int map_request(struct dm_rq_target_io *tio, struct request *rq,
                  }
                  if (IS_ERR(clone))
                          return DM_MAPIO_REQUEUE;
  -               if (setup_clone(clone, rq, tio, GFP_ATOMIC)) {
  -                       /* -ENOMEM */
  -                       ti->type->release_clone_rq(clone);
  -                       return DM_MAPIO_REQUEUE;
  -               }
  +               setup_clone(clone, rq, tio);
          }
   
          switch (r) {

-- 
Jun'ichi Nomura, NEC Corporation--
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