From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@fb.com>, Christoph Hellwig <hch@infradead.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Kent Overstreet <kent.overstreet@gmail.com>
Cc: David Sterba <dsterba@suse.cz>, Huang Ying <ying.huang@intel.com>,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
Theodore Ts'o <tytso@mit.edu>,
"Darrick J . Wong" <darrick.wong@oracle.com>,
Coly Li <colyli@suse.de>, Filipe Manana <fdmanana@gmail.com>,
Randy Dunlap <rdunlap@infradead.org>,
Ming Lei <ming.lei@redhat.com>
Subject: [PATCH V6 15/30] block: introduce bio_clone_chunk_bioset()
Date: Sat, 9 Jun 2018 20:29:59 +0800 [thread overview]
Message-ID: <20180609123014.8861-16-ming.lei@redhat.com> (raw)
In-Reply-To: <20180609123014.8861-1-ming.lei@redhat.com>
There is one use case(DM) which requires to clone bio chunk by
chunk, so introduce this API.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
block/bio.c | 56 +++++++++++++++++++++++++++++++++++++++--------------
include/linux/bio.h | 1 +
2 files changed, 43 insertions(+), 14 deletions(-)
diff --git a/block/bio.c b/block/bio.c
index cb0f46e2752b..60219f82ddab 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -644,21 +644,13 @@ struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs)
}
EXPORT_SYMBOL(bio_clone_fast);
-/**
- * bio_clone_bioset - clone a bio
- * @bio_src: bio to clone
- * @gfp_mask: allocation priority
- * @bs: bio_set to allocate from
- *
- * Clone bio. Caller will own the returned bio, but not the actual data it
- * points to. Reference count of returned bio will be one.
- */
-struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
- struct bio_set *bs)
+static struct bio *__bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
+ struct bio_set *bs, bool seg)
{
struct bvec_iter iter;
struct bio_vec bv;
struct bio *bio;
+ int nr_vecs = seg ? bio_segments(bio_src) : bio_chunks(bio_src);
/*
* Pre immutable biovecs, __bio_clone() used to just do a memcpy from
@@ -682,7 +674,7 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
* __bio_clone_fast() anyways.
*/
- bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs);
+ bio = bio_alloc_bioset(gfp_mask, nr_vecs, bs);
if (!bio)
return NULL;
bio->bi_disk = bio_src->bi_disk;
@@ -700,8 +692,13 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
break;
default:
- bio_for_each_segment(bv, bio_src, iter)
- bio->bi_io_vec[bio->bi_vcnt++] = bv;
+ if (seg) {
+ bio_for_each_segment(bv, bio_src, iter)
+ bio->bi_io_vec[bio->bi_vcnt++] = bv;
+ } else {
+ bio_for_each_chunk(bv, bio_src, iter)
+ bio->bi_io_vec[bio->bi_vcnt++] = bv;
+ }
break;
}
@@ -719,9 +716,40 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
return bio;
}
+
+/**
+ * bio_clone_bioset - clone a bio
+ * @bio_src: bio to clone
+ * @gfp_mask: allocation priority
+ * @bs: bio_set to allocate from
+ *
+ * Clone bio. Caller will own the returned bio, but not the actual data it
+ * points to. Reference count of returned bio will be one.
+ */
+struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
+ struct bio_set *bs)
+{
+ return __bio_clone_bioset(bio_src, gfp_mask, bs, true);
+}
EXPORT_SYMBOL(bio_clone_bioset);
/**
+ * bio_clone_seg_bioset - clone a bio segment by segment
+ * @bio_src: bio to clone
+ * @gfp_mask: allocation priority
+ * @bs: bio_set to allocate from
+ *
+ * Clone bio. Caller will own the returned bio, but not the actual data it
+ * points to. Reference count of returned bio will be one.
+ */
+struct bio *bio_clone_chunk_bioset(struct bio *bio_src, gfp_t gfp_mask,
+ struct bio_set *bs)
+{
+ return __bio_clone_bioset(bio_src, gfp_mask, bs, false);
+}
+EXPORT_SYMBOL(bio_clone_chunk_bioset);
+
+/**
* bio_add_pc_page - attempt to add page to bio
* @q: the target queue
* @bio: destination bio
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 13fd7bc30390..0fa1035dde38 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -483,6 +483,7 @@ extern void bio_put(struct bio *);
extern void __bio_clone_fast(struct bio *, struct bio *);
extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *);
extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
+extern struct bio *bio_clone_chunk_bioset(struct bio *, gfp_t, struct bio_set *bs);
extern struct bio_set fs_bio_set;
--
2.9.5
next prev parent reply other threads:[~2018-06-09 12:29 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-09 12:29 [PATCH V6 00/30] block: support multipage bvec Ming Lei
2018-06-09 12:29 ` [PATCH V6 01/30] block: simplify bio_check_pages_dirty Ming Lei
2018-06-09 12:29 ` [PATCH V6 02/30] block: bio_set_pages_dirty can't see NULL bv_page in a valid bio_vec Ming Lei
2018-06-09 12:29 ` [PATCH V6 03/30] block: use bio_add_page in bio_iov_iter_get_pages Ming Lei
2018-06-09 12:29 ` [PATCH V6 04/30] block: introduce multipage page bvec helpers Ming Lei
2018-06-09 12:29 ` [PATCH V6 05/30] block: introduce bio_for_each_chunk() Ming Lei
2018-06-09 12:29 ` [PATCH V6 06/30] block: use bio_for_each_chunk() to compute multipage bvec count Ming Lei
2018-06-09 12:29 ` [PATCH V6 07/30] block: use bio_for_each_chunk() to map sg Ming Lei
2018-06-09 12:29 ` [PATCH V6 08/30] block: introduce chunk_last_segment() Ming Lei
2018-06-11 17:19 ` Christoph Hellwig
2018-06-12 3:24 ` Ming Lei
2018-06-09 12:29 ` [PATCH V6 09/30] fs/buffer.c: use bvec iterator to truncate the bio Ming Lei
2018-06-09 12:29 ` [PATCH V6 10/30] btrfs: use chunk_last_segment to get bio's last page Ming Lei
2018-06-09 12:29 ` [PATCH V6 11/30] block: implement bio_pages_all() via bio_for_each_segment_all() Ming Lei
2018-06-13 14:44 ` Christoph Hellwig
2018-06-14 1:23 ` Ming Lei
2018-06-14 6:20 ` Christoph Hellwig
2018-06-09 12:29 ` [PATCH V6 12/30] block: introduce bio_chunks() Ming Lei
2018-06-13 14:47 ` Christoph Hellwig
2018-06-13 14:57 ` Kent Overstreet
2018-06-09 12:29 ` [PATCH V6 13/30] block: introduce rq_for_each_chunk() Ming Lei
2018-06-13 14:48 ` Christoph Hellwig
2018-06-14 1:52 ` Ming Lei
2018-06-09 12:29 ` [PATCH V6 14/30] block: loop: pass multipage chunks to iov_iter Ming Lei
2018-06-09 12:29 ` Ming Lei [this message]
2018-06-13 14:56 ` [PATCH V6 15/30] block: introduce bio_clone_chunk_bioset() Christoph Hellwig
2018-06-14 2:01 ` Ming Lei
2018-06-14 6:39 ` Christoph Hellwig
2018-06-14 7:28 ` Ming Lei
2018-06-09 12:30 ` [PATCH V6 16/30] dm: clone bio via bio_clone_chunk_bioset Ming Lei
2018-06-09 12:30 ` [PATCH V6 17/30] block: introduce bio_for_each_chunk_all and bio_for_each_chunk_segment_all Ming Lei
2018-06-09 12:30 ` [PATCH V6 18/30] block: convert to bio_for_each_chunk_segment_all() Ming Lei
2018-06-09 12:30 ` [PATCH V6 19/30] md/dm/bcache: conver to bio_for_each_chunk_segment_all and bio_for_each_chunk_all Ming Lei
2018-06-10 12:38 ` Coly Li
2018-06-13 14:57 ` Christoph Hellwig
2018-06-09 12:30 ` [PATCH V6 20/30] fs: conver to bio_for_each_chunk_segment_all() Ming Lei
2018-06-09 12:30 ` [PATCH V6 21/30] btrfs: conver to bio_for_each_chunk_segment_all Ming Lei
2018-06-09 12:30 ` [PATCH V6 22/30] ext4: " Ming Lei
2018-06-09 12:30 ` [PATCH V6 23/30] f2fs: " Ming Lei
2018-06-09 12:30 ` [PATCH V6 24/30] xfs: " Ming Lei
2018-06-09 12:30 ` [PATCH V6 25/30] exofs: " Ming Lei
2018-06-09 12:30 ` [PATCH V6 26/30] gfs2: " Ming Lei
2018-06-09 12:30 ` [PATCH V6 27/30] block: kill bio_for_each_segment_all() Ming Lei
2018-06-09 12:30 ` [PATCH V6 28/30] block: enable multipage bvecs Ming Lei
2018-06-09 12:30 ` [PATCH V6 29/30] block: always define BIO_MAX_PAGES as 256 Ming Lei
2018-06-09 12:30 ` [PATCH V6 30/30] block: document usage of bio iterator helpers Ming Lei
2018-06-15 15:43 ` Gi-Oh Kim
2018-06-11 16:48 ` [PATCH V6 00/30] block: support multipage bvec Christoph Hellwig
2018-06-12 3:42 ` Ming Lei
2018-06-13 14:42 ` Christoph Hellwig
2018-06-14 1:18 ` Ming Lei
2018-06-14 6:18 ` Christoph Hellwig
2018-06-13 14:59 ` Kent Overstreet
2018-06-14 1:20 ` Ming Lei
2018-06-15 12:59 ` Gi-Oh Kim
2018-06-21 1:17 ` Ming Lei
2018-06-21 8:40 ` Gi-Oh Kim
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