All of lore.kernel.org
 help / color / mirror / Atom feed
From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>, Mike Snitzer <snitzer@redhat.com>
Cc: linux-block@vger.kernel.org,
	Jeffle Xu <jefflexu@linux.alibaba.com>,
	dm-devel@redhat.com, Hannes Reinecke <hare@suse.de>,
	Christoph Hellwig <hch@lst.de>, Ming Lei <ming.lei@redhat.com>
Subject: [RFC PATCH 2/4] block: add field of .bi_bio_drv_data to bio
Date: Wed, 16 Jun 2021 21:05:31 +0800	[thread overview]
Message-ID: <20210616130533.754248-3-ming.lei@redhat.com> (raw)
In-Reply-To: <20210616130533.754248-1-ming.lei@redhat.com>

After bio is submitted, bio->bi_next is used for IO merge for request
based queue only.

Reuse the filed for bio based driver for storing driver data, and name
it as .bi_bio_drv_data.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 include/linux/blk_types.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 6e6c2af48d74..acb45213338c 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -220,7 +220,16 @@ typedef unsigned int blk_qc_t;
  * stacking drivers)
  */
 struct bio {
-	struct bio		*bi_next;	/* request queue link */
+	union {
+		/* request queue link */
+		struct bio		*bi_next;
+
+		/*
+		 * once bio is submitted to bio based queue, driver can use
+		 * this field to store its own data
+		 */
+		void			*bi_bio_drv_data;
+	};
 	struct block_device	*bi_bdev;
 	unsigned int		bi_opf;		/* bottom bits req flags,
 						 * top bits REQ_OP. Use
-- 
2.31.1


WARNING: multiple messages have this Message-ID (diff)
From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>, Mike Snitzer <snitzer@redhat.com>
Cc: Ming Lei <ming.lei@redhat.com>,
	linux-block@vger.kernel.org, dm-devel@redhat.com,
	Jeffle Xu <jefflexu@linux.alibaba.com>,
	Christoph Hellwig <hch@lst.de>
Subject: [dm-devel] [RFC PATCH 2/4] block: add field of .bi_bio_drv_data to bio
Date: Wed, 16 Jun 2021 21:05:31 +0800	[thread overview]
Message-ID: <20210616130533.754248-3-ming.lei@redhat.com> (raw)
In-Reply-To: <20210616130533.754248-1-ming.lei@redhat.com>

After bio is submitted, bio->bi_next is used for IO merge for request
based queue only.

Reuse the filed for bio based driver for storing driver data, and name
it as .bi_bio_drv_data.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 include/linux/blk_types.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 6e6c2af48d74..acb45213338c 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -220,7 +220,16 @@ typedef unsigned int blk_qc_t;
  * stacking drivers)
  */
 struct bio {
-	struct bio		*bi_next;	/* request queue link */
+	union {
+		/* request queue link */
+		struct bio		*bi_next;
+
+		/*
+		 * once bio is submitted to bio based queue, driver can use
+		 * this field to store its own data
+		 */
+		void			*bi_bio_drv_data;
+	};
 	struct block_device	*bi_bdev;
 	unsigned int		bi_opf;		/* bottom bits req flags,
 						 * top bits REQ_OP. Use
-- 
2.31.1

--
dm-devel mailing list
dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel


  parent reply	other threads:[~2021-06-16 13:07 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-16 13:05 [RFC PATCH 0/4] block/dm: support bio polling Ming Lei
2021-06-16 13:05 ` [dm-devel] " Ming Lei
2021-06-16 13:05 ` [RFC PATCH 1/4] block: add helper of blk_queue_poll Ming Lei
2021-06-16 13:05   ` [dm-devel] " Ming Lei
2021-06-16 13:05 ` Ming Lei [this message]
2021-06-16 13:05   ` [dm-devel] [RFC PATCH 2/4] block: add field of .bi_bio_drv_data to bio Ming Lei
2021-06-16 13:05 ` [RFC PATCH 3/4] block: add ->poll_bio to block_device_operations Ming Lei
2021-06-16 13:05   ` [dm-devel] " Ming Lei
2021-06-16 13:05 ` [RFC PATCH 4/4] dm: support bio polling Ming Lei
2021-06-16 13:05   ` [dm-devel] " Ming Lei
2021-06-16 16:05   ` Mike Snitzer
2021-06-16 16:05     ` [dm-devel] " Mike Snitzer
2021-06-17  2:14     ` Ming Lei
2021-06-17  2:14       ` [dm-devel] " Ming Lei
2021-06-18 14:33     ` Christoph Hellwig
2021-06-18 14:33       ` [dm-devel] " Christoph Hellwig

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=20210616130533.754248-3-ming.lei@redhat.com \
    --to=ming.lei@redhat.com \
    --cc=axboe@kernel.dk \
    --cc=dm-devel@redhat.com \
    --cc=hare@suse.de \
    --cc=hch@lst.de \
    --cc=jefflexu@linux.alibaba.com \
    --cc=linux-block@vger.kernel.org \
    --cc=snitzer@redhat.com \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.