From: Christoph Hellwig <hch@infradead.org>
To: NeilBrown <neilb@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
Philipp Reisner <philipp.reisner@linbit.com>,
Lars Ellenberg <lars.ellenberg@linbit.com>,
drbd-dev@lists.linbit.com
Subject: Re: [PATCH 06/11] drbd: use bio_clone_fast() instead of bio_clone()
Date: Fri, 21 Apr 2017 04:30:43 -0700 [thread overview]
Message-ID: <20170421113043.GF12523@infradead.org> (raw)
In-Reply-To: <149266672944.27388.18032655582081459017.stgit@noble>
On Thu, Apr 20, 2017 at 03:38:49PM +1000, NeilBrown wrote:
> drbd does not modify the bi_io_vec of the cloned bio,
> so there is no need to clone that part. So bio_clone_fast()
> is the better choice.
> For bio_clone_fast() we need to specify a bio_set.
> We could use fs_bio_set, which bio_clone() uses, or
> drbd_md_io_bio_set, which drbd uses for metadata, but it is
> generally best to avoid sharing bio_sets unless you can
> be certain that there are no interdependencies.
>
> So create a new bio_set, drbd_io_bio_set, and use bio_clone_fast().
>
> Signed-off-by: NeilBrown <neilb@suse.com>
All the zeroing of the gblobal variable looks unessecary / stupid.
But given that the surrounding code already does it:
Reviewed-by: Christoph Hellwig <hch@lst.de>
> + bio = bio_clone_fast(bio_src, GFP_NOIO, drbd_io_bio_set); /* XXX cannot fail!! */
but maybe I'd drop this comment..
next prev parent reply other threads:[~2017-04-21 11:30 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-20 5:38 [PATCH 00/11] block: assorted cleanup for bio splitting and cloning NeilBrown
2017-04-20 5:38 ` [PATCH 01/11] blk: remove bio_set arg from blk_queue_split() NeilBrown
2017-04-21 11:21 ` Christoph Hellwig
2017-04-21 15:14 ` Ming Lei
2017-04-22 9:16 ` Javier González
2017-04-24 2:32 ` NeilBrown
2017-04-20 5:38 ` [PATCH 02/11] blk: make the bioset rescue_workqueue optional NeilBrown
2017-04-21 11:24 ` Christoph Hellwig
2017-04-24 1:51 ` NeilBrown
2017-04-24 15:10 ` Christoph Hellwig
2017-05-01 5:00 ` NeilBrown
2017-05-01 14:02 ` Jens Axboe
2017-05-02 3:33 ` NeilBrown
2017-04-20 5:38 ` [PATCH 07/11] pktcdvd: use bio_clone_fast() instead of bio_clone() NeilBrown
2017-04-21 11:29 ` Christoph Hellwig
2017-04-20 5:38 ` [PATCH 05/11] rbd: " NeilBrown
2017-04-21 11:31 ` Christoph Hellwig
2017-04-20 5:38 ` [PATCH 03/11] blk: use non-rescuing bioset for q->bio_split NeilBrown
2017-04-21 11:25 ` Christoph Hellwig
2017-04-20 5:38 ` [PATCH 04/11] block: Improvements to bounce-buffer handling NeilBrown
2017-04-21 11:28 ` Christoph Hellwig
2017-04-21 15:39 ` Ming Lei
2017-04-20 5:38 ` [PATCH 06/11] drbd: use bio_clone_fast() instead of bio_clone() NeilBrown
2017-04-21 11:30 ` Christoph Hellwig [this message]
2017-04-20 5:38 ` [PATCH 09/11] bcache: use kmalloc to allocate bio in bch_data_verify() NeilBrown
2017-04-21 11:31 ` Christoph Hellwig
2017-04-21 11:32 ` Kent Overstreet
2017-04-21 15:41 ` Ming Lei
2017-04-20 5:38 ` [PATCH 08/11] xen-blkfront: remove bio splitting NeilBrown
2017-04-20 10:00 ` Roger Pau Monné
2017-04-21 11:36 ` Christoph Hellwig
2017-04-21 11:46 ` Roger Pau Monne
2017-04-20 5:38 ` [PATCH 11/11] block: don't check for BIO_MAX_PAGES in blk_bio_segment_split() NeilBrown
2017-04-21 11:34 ` Christoph Hellwig
2017-04-21 15:48 ` Ming Lei
2017-04-24 3:16 ` NeilBrown
2017-04-24 3:14 ` NeilBrown
2017-04-20 5:38 ` [PATCH 10/11] block: remove bio_clone() and all references NeilBrown
2017-04-21 11:32 ` Christoph Hellwig
2017-04-21 15:43 ` Ming Lei
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