From: Ming Lei <tom.leiming@gmail.com>
To: Coly Li <i@coly.li>
Cc: Jens Axboe <axboe@fb.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-block <linux-block@vger.kernel.org>,
Christoph Hellwig <hch@infradead.org>,
Kent Overstreet <kent.overstreet@gmail.com>,
Shaohua Li <shli@kernel.org>, Mike Christie <mchristi@redhat.com>,
Guoqing Jiang <gqjiang@suse.com>,
"open list:BCACHE (BLOCK LAYER CACHE)"
<linux-bcache@vger.kernel.org>,
"open list:SOFTWARE RAID (Multiple Disks) SUPPORT"
<linux-raid@vger.kernel.org>
Subject: Re: [PATCH v1 23/54] bcache: handle bio_clone() & bvec updating for multipage bvecs
Date: Sat, 31 Dec 2016 18:29:32 +0800 [thread overview]
Message-ID: <CACVXFVNdJjo18PzdkacA_rpBpDydcemOh9ui2NfzZ2Qd22BX_A@mail.gmail.com> (raw)
In-Reply-To: <4d015585-c830-17ff-de4a-60f2d5f06a0d@coly.li>
Hi Coly,
On Fri, Dec 30, 2016 at 7:01 PM, Coly Li <i@coly.li> wrote:
> On 2016/12/27 下午11:56, Ming Lei wrote:
>> The incoming bio may be too big to be cloned into
>> one singlepage bvecs bio, so split the bio and
>> check the splitted bio one by one.
>>
>> Signed-off-by: Ming Lei <tom.leiming@gmail.com>
>> ---
>> drivers/md/bcache/debug.c | 24 ++++++++++++++++++++++--
>> 1 file changed, 22 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c
>> index 48d03e8b3385..18b2d2d138e3 100644
>> --- a/drivers/md/bcache/debug.c
>> +++ b/drivers/md/bcache/debug.c
>> @@ -103,7 +103,7 @@ void bch_btree_verify(struct btree *b)
>> up(&b->io_mutex);
>> }
>>
>> -void bch_data_verify(struct cached_dev *dc, struct bio *bio)
>> +static void __bch_data_verify(struct cached_dev *dc, struct bio *bio)
>> {
>> char name[BDEVNAME_SIZE];
>> struct bio *check;
>> @@ -116,7 +116,7 @@ void bch_data_verify(struct cached_dev *dc, struct bio *bio)
>> * in the new cloned bio because each single page need
>> * to assign to each bvec of the new bio.
>> */
>> - check = bio_clone(bio, GFP_NOIO);
>> + check = bio_clone_sp(bio, GFP_NOIO);
>> if (!check)
>> return;
>> check->bi_opf = REQ_OP_READ;
>> @@ -151,6 +151,26 @@ void bch_data_verify(struct cached_dev *dc, struct bio *bio)
>> bio_put(check);
>> }
>>
>> +void bch_data_verify(struct cached_dev *dc, struct bio *bio)
>> +{
>> + struct request_queue *q = bdev_get_queue(bio->bi_bdev);
>> + struct bio *clone = bio_clone_fast(bio, GFP_NOIO, q->bio_split);
>> + unsigned sectors;
>> +
>> + while (!bio_can_convert_to_sp(clone, §ors)) {
>> + struct bio *split = bio_split(clone, sectors,
>> + GFP_NOIO, q->bio_split);
>> +
>> + __bch_data_verify(dc, split);
>> + bio_put(split);
>> + }
>> +
>> + if (bio_sectors(clone))
>> + __bch_data_verify(dc, clone);
>> +
>> + bio_put(clone);
>> +}
>> +
>
> Hi Lei,
>
> The above patch is good IMHO. Just wondering why not use the classical
> style ? something like,
I don't know there is the classical style, :-)
>
>
> do {
> if (!bio_can_convert_to_sp(clone, §ors))
> split = bio_split(clone, sectors,
> GFP_NOIO, q->bio_split);
> else
> split = clone;
>
> __bch_data_verity(gc, split);
> bio_put(split);
> } while (split != clone);
>
>
> I guess maybe the above style generates less binary code.
Maybe, will take this style in V2.
Thanks for the review!
--
Ming Lei
next prev parent reply other threads:[~2016-12-31 10:29 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1482854250-13481-1-git-send-email-tom.leiming@gmail.com>
2016-12-27 15:55 ` [PATCH v1 01/54] block: drbd: comment on direct access bvec table Ming Lei
2016-12-27 15:55 ` [PATCH v1 02/54] block: loop: comment on direct access to " Ming Lei
2016-12-27 15:55 ` [PATCH v1 03/54] kernel/power/swap.c: " Ming Lei
2016-12-27 15:55 ` [PATCH v1 04/54] mm: page_io.c: " Ming Lei
2016-12-27 15:55 ` [PATCH v1 05/54] fs/buffer: " Ming Lei
2016-12-27 15:55 ` [PATCH v1 06/54] f2fs: f2fs_read_end_io: " Ming Lei
2016-12-27 15:55 ` [PATCH v1 07/54] bcache: " Ming Lei
2016-12-30 16:56 ` Coly Li
2016-12-27 15:55 ` [PATCH v1 08/54] block: comment on bio_alloc_pages() Ming Lei
2016-12-30 10:40 ` Coly Li
2016-12-30 11:06 ` Coly Li
2016-12-27 15:55 ` [PATCH v1 09/54] block: comment on bio_iov_iter_get_pages() Ming Lei
2016-12-27 15:55 ` [PATCH v1 10/54] block: introduce flag QUEUE_FLAG_NO_MP Ming Lei
2016-12-27 15:56 ` [PATCH v1 11/54] md: set NO_MP for request queue of md Ming Lei
2016-12-27 15:56 ` [PATCH v1 12/54] dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE Ming Lei
2017-01-03 16:43 ` Mike Snitzer
2017-01-06 3:30 ` Ming Lei
2016-12-27 15:56 ` [PATCH v1 13/54] block: comments on bio_for_each_segment[_all] Ming Lei
2016-12-27 15:56 ` [PATCH v1 14/54] block: introduce multipage/single page bvec helpers Ming Lei
2016-12-27 15:56 ` [PATCH v1 15/54] block: implement sp version of bvec iterator helpers Ming Lei
2016-12-27 15:56 ` [PATCH v1 16/54] block: introduce bio_for_each_segment_mp() Ming Lei
2016-12-27 15:56 ` [PATCH v1 17/54] block: introduce bio_clone_sp() Ming Lei
2016-12-27 15:56 ` [PATCH v1 18/54] bvec_iter: introduce BVEC_ITER_ALL_INIT Ming Lei
2016-12-27 15:56 ` [PATCH v1 19/54] block: bounce: avoid direct access to bvec table Ming Lei
2016-12-27 15:56 ` [PATCH v1 20/54] block: bounce: don't access bio->bi_io_vec in copy_to_high_bio_irq Ming Lei
2016-12-27 15:56 ` [PATCH v1 21/54] block: introduce bio_can_convert_to_sp() Ming Lei
2016-12-27 15:56 ` [PATCH v1 22/54] block: bounce: convert multipage bvecs into singlepage Ming Lei
2016-12-27 15:56 ` [PATCH v1 23/54] bcache: handle bio_clone() & bvec updating for multipage bvecs Ming Lei
2016-12-30 11:01 ` Coly Li
2016-12-31 10:29 ` Ming Lei [this message]
2016-12-27 15:56 ` [PATCH v1 24/54] blk-merge: compute bio->bi_seg_front_size efficiently Ming Lei
2016-12-27 15:56 ` [PATCH v1 25/54] block: blk-merge: try to make front segments in full size Ming Lei
2016-12-27 15:56 ` [PATCH v1 26/54] block: blk-merge: remove unnecessary check Ming Lei
2016-12-27 15:56 ` [PATCH v1 27/54] block: use bio_for_each_segment_mp() to compute segments count Ming Lei
2016-12-27 15:56 ` [PATCH v1 28/54] block: use bio_for_each_segment_mp() to map sg Ming Lei
2016-12-27 15:56 ` [PATCH v1 29/54] block: introduce bvec_for_each_sp_bvec() Ming Lei
2016-12-27 15:56 ` [PATCH v1 30/54] block: bio: introduce single/multi page version of bio_for_each_segment_all() Ming Lei
2016-12-27 15:56 ` [PATCH v1 31/54] block: introduce bio_segments_all() Ming Lei
2017-01-16 3:19 ` [PATCH v1 00/54] block: support multipage bvec Ming Lei
2017-01-16 15:18 ` Christoph Hellwig
2017-01-17 2:40 ` Ming Lei
2017-01-17 7:50 ` Christoph Hellwig
2017-01-17 8:13 ` Ming Lei
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CACVXFVNdJjo18PzdkacA_rpBpDydcemOh9ui2NfzZ2Qd22BX_A@mail.gmail.com \
--to=tom.leiming@gmail.com \
--cc=axboe@fb.com \
--cc=gqjiang@suse.com \
--cc=hch@infradead.org \
--cc=i@coly.li \
--cc=kent.overstreet@gmail.com \
--cc=linux-bcache@vger.kernel.org \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-raid@vger.kernel.org \
--cc=mchristi@redhat.com \
--cc=shli@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).