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From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Geoff Levand <geoff@infradead.org>,
	Ilya Dryomov <idryomov@gmail.com>,
	Dongsheng Yang <dongsheng.yang@easystack.cn>,
	Mike Snitzer <snitzer@redhat.com>,
	Ira Weiny <ira.weiny@intel.com>,
	dm-devel@redhat.com, linux-mips@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, ceph-devel@vger.kernel.org
Subject: [PATCH 11/16] block: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec
Date: Tue,  8 Jun 2021 18:05:58 +0200	[thread overview]
Message-ID: <20210608160603.1535935-12-hch@lst.de> (raw)
In-Reply-To: <20210608160603.1535935-1-hch@lst.de>

Use the proper helpers instead of open coding the copy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/bio.c | 28 ++++++++--------------------
 1 file changed, 8 insertions(+), 20 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 1d7abdb83a39..c14d2e66c084 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1186,27 +1186,15 @@ EXPORT_SYMBOL(bio_advance);
 void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
 			struct bio *src, struct bvec_iter *src_iter)
 {
-	struct bio_vec src_bv, dst_bv;
-	void *src_p, *dst_p;
-	unsigned bytes;
-
 	while (src_iter->bi_size && dst_iter->bi_size) {
-		src_bv = bio_iter_iovec(src, *src_iter);
-		dst_bv = bio_iter_iovec(dst, *dst_iter);
-
-		bytes = min(src_bv.bv_len, dst_bv.bv_len);
-
-		src_p = kmap_atomic(src_bv.bv_page);
-		dst_p = kmap_atomic(dst_bv.bv_page);
-
-		memcpy(dst_p + dst_bv.bv_offset,
-		       src_p + src_bv.bv_offset,
-		       bytes);
-
-		kunmap_atomic(dst_p);
-		kunmap_atomic(src_p);
-
-		flush_dcache_page(dst_bv.bv_page);
+		struct bio_vec src_bv = bio_iter_iovec(src, *src_iter);
+		struct bio_vec dst_bv = bio_iter_iovec(dst, *dst_iter);
+		unsigned int bytes = min(src_bv.bv_len, dst_bv.bv_len);
+		void *src_buf;
+
+		src_buf = bvec_kmap_local(&src_bv);
+		memcpy_to_bvec(&dst_bv, src_buf);
+		kunmap_local(src_buf);
 
 		bio_advance_iter_single(src, src_iter, bytes);
 		bio_advance_iter_single(dst, dst_iter, bytes);
-- 
2.30.2


WARNING: multiple messages have this Message-ID
From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Mike Snitzer <snitzer@redhat.com>,
	Geoff Levand <geoff@infradead.org>,
	linuxppc-dev@lists.ozlabs.org, linux-mips@vger.kernel.org,
	Dongsheng Yang <dongsheng.yang@easystack.cn>,
	linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
	dm-devel@redhat.com, Ilya Dryomov <idryomov@gmail.com>,
	Ira Weiny <ira.weiny@intel.com>,
	ceph-devel@vger.kernel.org
Subject: [PATCH 11/16] block: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec
Date: Tue,  8 Jun 2021 18:05:58 +0200	[thread overview]
Message-ID: <20210608160603.1535935-12-hch@lst.de> (raw)
In-Reply-To: <20210608160603.1535935-1-hch@lst.de>

Use the proper helpers instead of open coding the copy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/bio.c | 28 ++++++++--------------------
 1 file changed, 8 insertions(+), 20 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 1d7abdb83a39..c14d2e66c084 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1186,27 +1186,15 @@ EXPORT_SYMBOL(bio_advance);
 void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
 			struct bio *src, struct bvec_iter *src_iter)
 {
-	struct bio_vec src_bv, dst_bv;
-	void *src_p, *dst_p;
-	unsigned bytes;
-
 	while (src_iter->bi_size && dst_iter->bi_size) {
-		src_bv = bio_iter_iovec(src, *src_iter);
-		dst_bv = bio_iter_iovec(dst, *dst_iter);
-
-		bytes = min(src_bv.bv_len, dst_bv.bv_len);
-
-		src_p = kmap_atomic(src_bv.bv_page);
-		dst_p = kmap_atomic(dst_bv.bv_page);
-
-		memcpy(dst_p + dst_bv.bv_offset,
-		       src_p + src_bv.bv_offset,
-		       bytes);
-
-		kunmap_atomic(dst_p);
-		kunmap_atomic(src_p);
-
-		flush_dcache_page(dst_bv.bv_page);
+		struct bio_vec src_bv = bio_iter_iovec(src, *src_iter);
+		struct bio_vec dst_bv = bio_iter_iovec(dst, *dst_iter);
+		unsigned int bytes = min(src_bv.bv_len, dst_bv.bv_len);
+		void *src_buf;
+
+		src_buf = bvec_kmap_local(&src_bv);
+		memcpy_to_bvec(&dst_bv, src_buf);
+		kunmap_local(src_buf);
 
 		bio_advance_iter_single(src, src_iter, bytes);
 		bio_advance_iter_single(dst, dst_iter, bytes);
-- 
2.30.2


WARNING: multiple messages have this Message-ID
From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Mike Snitzer <snitzer@redhat.com>,
	Geoff Levand <geoff@infradead.org>,
	linuxppc-dev@lists.ozlabs.org, linux-mips@vger.kernel.org,
	Dongsheng Yang <dongsheng.yang@easystack.cn>,
	linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
	dm-devel@redhat.com, Ilya Dryomov <idryomov@gmail.com>,
	Ira Weiny <ira.weiny@intel.com>,
	ceph-devel@vger.kernel.org
Subject: [dm-devel] [PATCH 11/16] block: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec
Date: Tue,  8 Jun 2021 18:05:58 +0200	[thread overview]
Message-ID: <20210608160603.1535935-12-hch@lst.de> (raw)
In-Reply-To: <20210608160603.1535935-1-hch@lst.de>

Use the proper helpers instead of open coding the copy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/bio.c | 28 ++++++++--------------------
 1 file changed, 8 insertions(+), 20 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 1d7abdb83a39..c14d2e66c084 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1186,27 +1186,15 @@ EXPORT_SYMBOL(bio_advance);
 void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
 			struct bio *src, struct bvec_iter *src_iter)
 {
-	struct bio_vec src_bv, dst_bv;
-	void *src_p, *dst_p;
-	unsigned bytes;
-
 	while (src_iter->bi_size && dst_iter->bi_size) {
-		src_bv = bio_iter_iovec(src, *src_iter);
-		dst_bv = bio_iter_iovec(dst, *dst_iter);
-
-		bytes = min(src_bv.bv_len, dst_bv.bv_len);
-
-		src_p = kmap_atomic(src_bv.bv_page);
-		dst_p = kmap_atomic(dst_bv.bv_page);
-
-		memcpy(dst_p + dst_bv.bv_offset,
-		       src_p + src_bv.bv_offset,
-		       bytes);
-
-		kunmap_atomic(dst_p);
-		kunmap_atomic(src_p);
-
-		flush_dcache_page(dst_bv.bv_page);
+		struct bio_vec src_bv = bio_iter_iovec(src, *src_iter);
+		struct bio_vec dst_bv = bio_iter_iovec(dst, *dst_iter);
+		unsigned int bytes = min(src_bv.bv_len, dst_bv.bv_len);
+		void *src_buf;
+
+		src_buf = bvec_kmap_local(&src_bv);
+		memcpy_to_bvec(&dst_bv, src_buf);
+		kunmap_local(src_buf);
 
 		bio_advance_iter_single(src, src_iter, bytes);
 		bio_advance_iter_single(dst, dst_iter, bytes);
-- 
2.30.2

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


  parent reply	other threads:[~2021-06-08 16:07 UTC|newest]

Thread overview: 110+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-08 16:05 [dm-devel] switch the block layer to use kmap_local_page Christoph Hellwig
2021-06-08 16:05 ` [dm-devel] [PATCH 01/16] mm: use kmap_local_page in memzero_page Christoph Hellwig
2021-06-08 18:17   ` Chaitanya Kulkarni
2021-06-08 16:05 ` [dm-devel] [PATCH 02/16] MIPS: don't include <linux/genhd.h> in <asm/mach-rc32434/rb.h> Christoph Hellwig
2021-06-08 16:23   ` Bart Van Assche
2021-06-08 16:05 ` [dm-devel] [PATCH 03/16] bvec: fix the include guards for bvec.h Christoph Hellwig
2021-06-08 16:23   ` Bart Van Assche
2021-06-08 18:18   ` Chaitanya Kulkarni
2021-06-08 16:05 ` [dm-devel] [PATCH 04/16] bvec: add a bvec_kmap_local helper Christoph Hellwig
2021-06-08 18:18   ` Chaitanya Kulkarni
2021-06-09  9:33   ` Ilya Dryomov
2021-06-08 16:05 ` [dm-devel] [PATCH 05/16] bvec: add memcpy_{from, to}_bvec and memzero_bvec helper Christoph Hellwig
2021-06-08 18:21   ` Chaitanya Kulkarni
2021-06-08 16:05 ` [dm-devel] [PATCH 06/16] block: use memzero_page in zero_fill_bio Christoph Hellwig
2021-06-08 18:19   ` Chaitanya Kulkarni
2021-06-08 16:05 ` [dm-devel] [PATCH 07/16] rbd: use memzero_bvec Christoph Hellwig
2021-06-09  9:37   ` Ilya Dryomov
2021-06-08 16:05 ` [dm-devel] [PATCH 08/16] dm-writecache: use bvec_kmap_local instead of bvec_kmap_irq Christoph Hellwig
2021-06-08 16:30   ` Bart Van Assche
2021-06-08 16:38     ` Christoph Hellwig
2021-06-08 16:05 ` [dm-devel] [PATCH 09/16] ps3disk: use memcpy_{from,to}_bvec Christoph Hellwig
2021-06-09  1:48   ` Ira Weiny
2021-06-11  6:53     ` Christoph Hellwig
2021-06-12  4:07       ` Ira Weiny
2021-06-15  5:02         ` Herbert Xu
2021-06-08 16:05 ` [dm-devel] [PATCH 10/16] block: remove bvec_kmap_irq and bvec_kunmap_irq Christoph Hellwig
2021-06-08 16:05 ` Christoph Hellwig [this message]
2021-06-08 16:05 ` [dm-devel] [PATCH 12/16] block: use memcpy_to_bvec in copy_to_high_bio_irq Christoph Hellwig
2021-06-08 18:24   ` Chaitanya Kulkarni
2021-06-08 16:06 ` [dm-devel] [PATCH 13/16] block: use memcpy_from_bvec in bio_copy_kern_endio_read Christoph Hellwig
2021-06-08 18:26   ` Chaitanya Kulkarni
2021-06-08 16:06 ` [dm-devel] [PATCH 14/16] block: use memcpy_from_bvec in __blk_queue_bounce Christoph Hellwig
2021-06-09  1:58   ` Ira Weiny
2021-06-08 16:06 ` [dm-devel] [PATCH 15/16] block: use bvec_kmap_local in t10_pi_type1_{prepare, complete} Christoph Hellwig
2021-06-08 16:06 ` [dm-devel] [PATCH 16/16] block: use bvec_kmap_local in bio_integrity_process Christoph Hellwig
2021-06-09  1:59 ` [dm-devel] switch the block layer to use kmap_local_page Ira Weiny

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