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From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: Mike Snitzer <snitzer@redhat.com>,
	linux-mm@kvack.org, dm-devel@redhat.com,
	Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	Omar Sandoval <osandov@fb.com>,
	cluster-devel@redhat.com, linux-ext4@vger.kernel.org,
	Shaohua Li <shli@kernel.org>,
	Kent Overstreet <kent.overstreet@gmail.com>,
	Boaz Harrosh <ooo@electrozaur.com>,
	Gao Xiang <gaoxiang25@huawei.com>, Coly Li <colyli@suse.de>,
	linux-raid@vger.kernel.org, linux-bcache@vger.kernel.org,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	David Sterba <dsterba@suse.com>, Ming Lei <ming.lei@redhat.com>,
	linux-block@vger.kernel.org, Theodore Ts'o <tytso@mit.edu>,
	linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org
Subject: [PATCH V12 08/20] block: introduce bio_for_each_bvec() and rq_for_each_bvec()
Date: Mon, 26 Nov 2018 10:17:08 +0800	[thread overview]
Message-ID: <20181126021720.19471-9-ming.lei@redhat.com> (raw)
In-Reply-To: <20181126021720.19471-1-ming.lei@redhat.com>

bio_for_each_bvec() is used for iterating over multi-page bvec for bio
split & merge code.

rq_for_each_bvec() can be used for drivers which may handle the
multi-page bvec directly, so far loop is one perfect use case.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 include/linux/bio.h    | 10 ++++++++++
 include/linux/blkdev.h |  4 ++++
 include/linux/bvec.h   |  7 +++++++
 3 files changed, 21 insertions(+)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 6a0ff02f4d1c..46fd0e03233b 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -156,6 +156,16 @@ static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
 #define bio_for_each_segment(bvl, bio, iter)				\
 	__bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter)
 
+#define __bio_for_each_bvec(bvl, bio, iter, start)		\
+	for (iter = (start);						\
+	     (iter).bi_size &&						\
+		((bvl = bvec_iter_bvec((bio)->bi_io_vec, (iter))), 1); \
+	     bio_advance_iter((bio), &(iter), (bvl).bv_len))
+
+/* iterate over multi-page bvec */
+#define bio_for_each_bvec(bvl, bio, iter)			\
+	__bio_for_each_bvec(bvl, bio, iter, (bio)->bi_iter)
+
 #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
 
 static inline unsigned bio_segments(struct bio *bio)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 399a7a415609..fa263de3f1d1 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -799,6 +799,10 @@ struct req_iterator {
 	__rq_for_each_bio(_iter.bio, _rq)			\
 		bio_for_each_segment(bvl, _iter.bio, _iter.iter)
 
+#define rq_for_each_bvec(bvl, _rq, _iter)			\
+	__rq_for_each_bio(_iter.bio, _rq)			\
+		bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
+
 #define rq_iter_last(bvec, _iter)				\
 		(_iter.bio->bi_next == NULL &&			\
 		 bio_iter_last(bvec, _iter.iter))
diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index babc6316c117..d441486db605 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -65,6 +65,13 @@ struct bvec_iter {
 #define bvec_iter_page_idx(bvec, iter)			\
 	(bvec_iter_offset((bvec), (iter)) / PAGE_SIZE)
 
+#define bvec_iter_bvec(bvec, iter)				\
+((struct bio_vec) {						\
+	.bv_page	= bvec_iter_page((bvec), (iter)),	\
+	.bv_len		= bvec_iter_len((bvec), (iter)),	\
+	.bv_offset	= bvec_iter_offset((bvec), (iter)),	\
+})
+
 /* For building single-page bvec(segment) in flight */
  #define segment_iter_offset(bvec, iter)				\
 	(bvec_iter_offset((bvec), (iter)) % PAGE_SIZE)
-- 
2.9.5

WARNING: multiple messages have this Message-ID (diff)
From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, Theodore Ts'o <tytso@mit.edu>,
	Omar Sandoval <osandov@fb.com>, Sagi Grimberg <sagi@grimberg.me>,
	Dave Chinner <dchinner@redhat.com>,
	Kent Overstreet <kent.overstreet@gmail.com>,
	Mike Snitzer <snitzer@redhat.com>,
	dm-devel@redhat.com, Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-fsdevel@vger.kernel.org, Shaohua Li <shli@kernel.org>,
	linux-raid@vger.kernel.org, David Sterba <dsterba@suse.com>,
	linux-btrfs@vger.kernel.org,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	linux-xfs@vger.kernel.org, Gao Xiang <gaoxiang25@huawei.com>,
	Christoph Hellwig <hch@lst.de>,
	linux-ext4@vger.kernel.org, Coly Li <colyli@suse.de>,
	linux-bcache@vger.kernel.org, Boaz Harrosh <ooo@electrozaur.com>,
	Bob Peterson <rpeterso@redhat.com>,
	cluster-devel@redhat.com, Ming Lei <ming.lei@redhat.com>
Subject: [PATCH V12 08/20] block: introduce bio_for_each_bvec() and rq_for_each_bvec()
Date: Mon, 26 Nov 2018 10:17:08 +0800	[thread overview]
Message-ID: <20181126021720.19471-9-ming.lei@redhat.com> (raw)
In-Reply-To: <20181126021720.19471-1-ming.lei@redhat.com>

bio_for_each_bvec() is used for iterating over multi-page bvec for bio
split & merge code.

rq_for_each_bvec() can be used for drivers which may handle the
multi-page bvec directly, so far loop is one perfect use case.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 include/linux/bio.h    | 10 ++++++++++
 include/linux/blkdev.h |  4 ++++
 include/linux/bvec.h   |  7 +++++++
 3 files changed, 21 insertions(+)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 6a0ff02f4d1c..46fd0e03233b 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -156,6 +156,16 @@ static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
 #define bio_for_each_segment(bvl, bio, iter)				\
 	__bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter)
 
+#define __bio_for_each_bvec(bvl, bio, iter, start)		\
+	for (iter = (start);						\
+	     (iter).bi_size &&						\
+		((bvl = bvec_iter_bvec((bio)->bi_io_vec, (iter))), 1); \
+	     bio_advance_iter((bio), &(iter), (bvl).bv_len))
+
+/* iterate over multi-page bvec */
+#define bio_for_each_bvec(bvl, bio, iter)			\
+	__bio_for_each_bvec(bvl, bio, iter, (bio)->bi_iter)
+
 #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
 
 static inline unsigned bio_segments(struct bio *bio)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 399a7a415609..fa263de3f1d1 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -799,6 +799,10 @@ struct req_iterator {
 	__rq_for_each_bio(_iter.bio, _rq)			\
 		bio_for_each_segment(bvl, _iter.bio, _iter.iter)
 
+#define rq_for_each_bvec(bvl, _rq, _iter)			\
+	__rq_for_each_bio(_iter.bio, _rq)			\
+		bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
+
 #define rq_iter_last(bvec, _iter)				\
 		(_iter.bio->bi_next == NULL &&			\
 		 bio_iter_last(bvec, _iter.iter))
diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index babc6316c117..d441486db605 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -65,6 +65,13 @@ struct bvec_iter {
 #define bvec_iter_page_idx(bvec, iter)			\
 	(bvec_iter_offset((bvec), (iter)) / PAGE_SIZE)
 
+#define bvec_iter_bvec(bvec, iter)				\
+((struct bio_vec) {						\
+	.bv_page	= bvec_iter_page((bvec), (iter)),	\
+	.bv_len		= bvec_iter_len((bvec), (iter)),	\
+	.bv_offset	= bvec_iter_offset((bvec), (iter)),	\
+})
+
 /* For building single-page bvec(segment) in flight */
  #define segment_iter_offset(bvec, iter)				\
 	(bvec_iter_offset((bvec), (iter)) % PAGE_SIZE)
-- 
2.9.5


WARNING: multiple messages have this Message-ID (diff)
From: Ming Lei <ming.lei@redhat.com>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] [PATCH V12 08/20] block: introduce bio_for_each_bvec() and rq_for_each_bvec()
Date: Mon, 26 Nov 2018 10:17:08 +0800	[thread overview]
Message-ID: <20181126021720.19471-9-ming.lei@redhat.com> (raw)
In-Reply-To: <20181126021720.19471-1-ming.lei@redhat.com>

bio_for_each_bvec() is used for iterating over multi-page bvec for bio
split & merge code.

rq_for_each_bvec() can be used for drivers which may handle the
multi-page bvec directly, so far loop is one perfect use case.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 include/linux/bio.h    | 10 ++++++++++
 include/linux/blkdev.h |  4 ++++
 include/linux/bvec.h   |  7 +++++++
 3 files changed, 21 insertions(+)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 6a0ff02f4d1c..46fd0e03233b 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -156,6 +156,16 @@ static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
 #define bio_for_each_segment(bvl, bio, iter)				\
 	__bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter)
 
+#define __bio_for_each_bvec(bvl, bio, iter, start)		\
+	for (iter = (start);						\
+	     (iter).bi_size &&						\
+		((bvl = bvec_iter_bvec((bio)->bi_io_vec, (iter))), 1); \
+	     bio_advance_iter((bio), &(iter), (bvl).bv_len))
+
+/* iterate over multi-page bvec */
+#define bio_for_each_bvec(bvl, bio, iter)			\
+	__bio_for_each_bvec(bvl, bio, iter, (bio)->bi_iter)
+
 #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
 
 static inline unsigned bio_segments(struct bio *bio)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 399a7a415609..fa263de3f1d1 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -799,6 +799,10 @@ struct req_iterator {
 	__rq_for_each_bio(_iter.bio, _rq)			\
 		bio_for_each_segment(bvl, _iter.bio, _iter.iter)
 
+#define rq_for_each_bvec(bvl, _rq, _iter)			\
+	__rq_for_each_bio(_iter.bio, _rq)			\
+		bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
+
 #define rq_iter_last(bvec, _iter)				\
 		(_iter.bio->bi_next == NULL &&			\
 		 bio_iter_last(bvec, _iter.iter))
diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index babc6316c117..d441486db605 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -65,6 +65,13 @@ struct bvec_iter {
 #define bvec_iter_page_idx(bvec, iter)			\
 	(bvec_iter_offset((bvec), (iter)) / PAGE_SIZE)
 
+#define bvec_iter_bvec(bvec, iter)				\
+((struct bio_vec) {						\
+	.bv_page	= bvec_iter_page((bvec), (iter)),	\
+	.bv_len		= bvec_iter_len((bvec), (iter)),	\
+	.bv_offset	= bvec_iter_offset((bvec), (iter)),	\
+})
+
 /* For building single-page bvec(segment) in flight */
  #define segment_iter_offset(bvec, iter)				\
 	(bvec_iter_offset((bvec), (iter)) % PAGE_SIZE)
-- 
2.9.5



  parent reply	other threads:[~2018-11-26  2:17 UTC|newest]

Thread overview: 144+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-26  2:17 [PATCH V12 00/20] block: support multi-page bvec Ming Lei
2018-11-26  2:17 ` [Cluster-devel] " Ming Lei
2018-11-26  2:17 ` Ming Lei
2018-11-26  2:17 ` [PATCH V12 01/20] btrfs: remove various bio_offset arguments Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 22:28   ` Omar Sandoval
2018-11-26 22:28     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:28     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 02/20] btrfs: look at bi_size for repair decisions Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 22:46   ` Omar Sandoval
2018-11-26 22:46     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:46     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 03/20] block: remove the "cluster" flag Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 22:12   ` Omar Sandoval
2018-11-26 22:12     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:12     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 04/20] block: don't use bio->bi_vcnt to figure out segment number Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 22:14   ` Omar Sandoval
2018-11-26 22:14     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:14     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 05/20] block: remove bvec_iter_rewind() Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 12:53   ` Christoph Hellwig
2018-11-26 12:53     ` [Cluster-devel] " Christoph Hellwig
2018-11-26 12:53     ` Christoph Hellwig
2018-11-26 22:16   ` Omar Sandoval
2018-11-26 22:16     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:16     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 06/20] block: rename bvec helpers Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26  8:17   ` Miguel Ojeda
2018-11-26  8:17     ` [Cluster-devel] " Miguel Ojeda
2018-11-26 12:54   ` Christoph Hellwig
2018-11-26 12:54     ` [Cluster-devel] " Christoph Hellwig
2018-11-26 12:54     ` Christoph Hellwig
2018-11-26 22:18   ` Omar Sandoval
2018-11-26 22:18     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:18     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 07/20] block: introduce multi-page " Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 12:55   ` Christoph Hellwig
2018-11-26 12:55     ` [Cluster-devel] " Christoph Hellwig
2018-11-26 12:55     ` Christoph Hellwig
2018-11-26  2:17 ` Ming Lei [this message]
2018-11-26  2:17   ` [Cluster-devel] [PATCH V12 08/20] block: introduce bio_for_each_bvec() and rq_for_each_bvec() Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 12:55   ` Christoph Hellwig
2018-11-26 12:55     ` [Cluster-devel] " Christoph Hellwig
2018-11-26 12:55     ` Christoph Hellwig
2018-11-26  2:17 ` [PATCH V12 09/20] block: use bio_for_each_bvec() to compute multi-page bvec count Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 13:11   ` Christoph Hellwig
2018-11-26 13:11     ` [Cluster-devel] " Christoph Hellwig
2018-11-26 13:11     ` Christoph Hellwig
2018-11-26 22:37   ` Omar Sandoval
2018-11-26 22:37     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:37     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 10/20] block: use bio_for_each_bvec() to map sg Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 13:11   ` Christoph Hellwig
2018-11-26 13:11     ` [Cluster-devel] " Christoph Hellwig
2018-11-26 13:11     ` Christoph Hellwig
2018-11-26  2:17 ` [PATCH V12 11/20] block: introduce bvec_last_segment() Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26  2:17 ` [PATCH V12 12/20] fs/buffer.c: use bvec iterator to truncate the bio Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26  2:17 ` [PATCH V12 13/20] block: loop: pass multi-page bvec to iov_iter Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 22:39   ` Omar Sandoval
2018-11-26 22:39     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:39     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 14/20] bcache: avoid to use bio_for_each_segment_all() in bch_bio_alloc_pages() Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 22:40   ` Omar Sandoval
2018-11-26 22:40     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:40     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 15/20] block: allow bio_for_each_segment_all() to iterate over multi-page bvec Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 22:42   ` Omar Sandoval
2018-11-26 22:42     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:42     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 16/20] block: enable multipage bvecs Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 12:58   ` Christoph Hellwig
2018-11-26 12:58     ` [Cluster-devel] " Christoph Hellwig
2018-11-26 12:58     ` Christoph Hellwig
2018-11-27  2:25     ` Ming Lei
2018-11-27  2:25       ` [Cluster-devel] " Ming Lei
2018-11-27  2:25       ` Ming Lei
2018-11-26 22:56   ` Omar Sandoval
2018-11-26 22:56     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:56     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 17/20] block: always define BIO_MAX_PAGES as 256 Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 22:44   ` Omar Sandoval
2018-11-26 22:44     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:44     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 18/20] block: document usage of bio iterator helpers Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26 12:59   ` Christoph Hellwig
2018-11-26 12:59     ` [Cluster-devel] " Christoph Hellwig
2018-11-26 12:59     ` Christoph Hellwig
2018-11-26 22:43   ` Omar Sandoval
2018-11-26 22:43     ` [Cluster-devel] " Omar Sandoval
2018-11-26 22:43     ` Omar Sandoval
2018-11-26  2:17 ` [PATCH V12 19/20] block: kill QUEUE_FLAG_NO_SG_MERGE Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-26  2:17 ` [PATCH V12 20/20] block: kill BLK_MQ_F_SG_MERGE Ming Lei
2018-11-26  2:17   ` [Cluster-devel] " Ming Lei
2018-11-26  2:17   ` Ming Lei
2018-11-28 13:44 ` [PATCH V12 00/20] block: support multi-page bvec Jens Axboe
2018-11-28 13:44   ` [Cluster-devel] " Jens Axboe
2018-11-28 13:44   ` Jens Axboe
2018-11-29  1:30   ` Ming Lei
2018-11-29  1:30     ` [Cluster-devel] " Ming Lei
2018-11-29  1:30     ` Ming Lei
2018-11-29  1:30     ` Ming Lei
2018-11-29  2:20     ` Jens Axboe
2018-11-29  2:20       ` [Cluster-devel] " Jens Axboe
2018-11-29  2:20       ` Jens Axboe
2018-11-29  3:30       ` Ming Lei
2018-11-29  3:30         ` [Cluster-devel] " Ming Lei
2018-11-29  3:30         ` Ming Lei

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