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Date: Thu, 15 Nov 2018 16:52:49 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Jens Axboe <axboe@...nel.dk>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, Ming Lei <ming.lei@...hat.com>,
Dave Chinner <dchinner@...hat.com>,
Kent Overstreet <kent.overstreet@...il.com>,
Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
Alexander Viro <viro@...iv.linux.org.uk>,
linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
linux-raid@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
"Darrick J . Wong" <darrick.wong@...cle.com>,
linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
Christoph Hellwig <hch@....de>, Theodore Ts'o <tytso@....edu>,
linux-ext4@...r.kernel.org, Coly Li <colyli@...e.de>,
linux-bcache@...r.kernel.org, Boaz Harrosh <ooo@...ctrozaur.com>,
Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com
Subject: [PATCH V10 02/19] block: introduce bio_for_each_bvec()
This helper is used for iterating over multi-page bvec for bio
split & merge code.
Cc: Dave Chinner <dchinner@...hat.com>
Cc: Kent Overstreet <kent.overstreet@...il.com>
Cc: Mike Snitzer <snitzer@...hat.com>
Cc: dm-devel@...hat.com
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
Cc: Shaohua Li <shli@...nel.org>
Cc: linux-raid@...r.kernel.org
Cc: linux-erofs@...ts.ozlabs.org
Cc: David Sterba <dsterba@...e.com>
Cc: linux-btrfs@...r.kernel.org
Cc: Darrick J. Wong <darrick.wong@...cle.com>
Cc: linux-xfs@...r.kernel.org
Cc: Gao Xiang <gaoxiang25@...wei.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Theodore Ts'o <tytso@....edu>
Cc: linux-ext4@...r.kernel.org
Cc: Coly Li <colyli@...e.de>
Cc: linux-bcache@...r.kernel.org
Cc: Boaz Harrosh <ooo@...ctrozaur.com>
Cc: Bob Peterson <rpeterso@...hat.com>
Cc: cluster-devel@...hat.com
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
include/linux/bio.h | 34 +++++++++++++++++++++++++++++++---
include/linux/bvec.h | 36 ++++++++++++++++++++++++++++++++----
2 files changed, 63 insertions(+), 7 deletions(-)
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 056fb627edb3..1f0dcf109841 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -76,6 +76,9 @@
#define bio_data_dir(bio) \
(op_is_write(bio_op(bio)) ? WRITE : READ)
+#define bio_iter_mp_iovec(bio, iter) \
+ mp_bvec_iter_bvec((bio)->bi_io_vec, (iter))
+
/*
* Check whether this bio carries any data or not. A NULL bio is allowed.
*/
@@ -135,18 +138,33 @@ static inline bool bio_full(struct bio *bio)
#define bio_for_each_segment_all(bvl, bio, i) \
for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++)
-static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
- unsigned bytes)
+static inline void __bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
+ unsigned bytes, bool mp)
{
iter->bi_sector += bytes >> 9;
if (bio_no_advance_iter(bio))
iter->bi_size -= bytes;
else
- bvec_iter_advance(bio->bi_io_vec, iter, bytes);
+ if (!mp)
+ bvec_iter_advance(bio->bi_io_vec, iter, bytes);
+ else
+ mp_bvec_iter_advance(bio->bi_io_vec, iter, bytes);
/* TODO: It is reasonable to complete bio with error here. */
}
+static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
+ unsigned bytes)
+{
+ __bio_advance_iter(bio, iter, bytes, false);
+}
+
+static inline void bio_advance_mp_iter(struct bio *bio, struct bvec_iter *iter,
+ unsigned bytes)
+{
+ __bio_advance_iter(bio, iter, bytes, true);
+}
+
#define __bio_for_each_segment(bvl, bio, iter, start) \
for (iter = (start); \
(iter).bi_size && \
@@ -156,6 +174,16 @@ 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 = bio_iter_mp_iovec((bio), (iter))), 1); \
+ bio_advance_mp_iter((bio), &(iter), (bvl).bv_len))
+
+/* returns one real segment(multipage bvec) each time */
+#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/bvec.h b/include/linux/bvec.h
index 8ef904a50577..3d61352cd8cf 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -124,8 +124,16 @@ struct bvec_iter {
.bv_offset = bvec_iter_offset((bvec), (iter)), \
})
-static inline bool bvec_iter_advance(const struct bio_vec *bv,
- struct bvec_iter *iter, unsigned bytes)
+#define mp_bvec_iter_bvec(bvec, iter) \
+((struct bio_vec) { \
+ .bv_page = mp_bvec_iter_page((bvec), (iter)), \
+ .bv_len = mp_bvec_iter_len((bvec), (iter)), \
+ .bv_offset = mp_bvec_iter_offset((bvec), (iter)), \
+})
+
+static inline bool __bvec_iter_advance(const struct bio_vec *bv,
+ struct bvec_iter *iter,
+ unsigned bytes, bool mp)
{
if (WARN_ONCE(bytes > iter->bi_size,
"Attempted to advance past end of bvec iter\n")) {
@@ -134,8 +142,14 @@ static inline bool bvec_iter_advance(const struct bio_vec *bv,
}
while (bytes) {
- unsigned iter_len = bvec_iter_len(bv, *iter);
- unsigned len = min(bytes, iter_len);
+ unsigned len;
+
+ if (mp)
+ len = mp_bvec_iter_len(bv, *iter);
+ else
+ len = bvec_iter_len(bv, *iter);
+
+ len = min(bytes, len);
bytes -= len;
iter->bi_size -= len;
@@ -173,6 +187,20 @@ static inline bool bvec_iter_rewind(const struct bio_vec *bv,
return true;
}
+static inline bool bvec_iter_advance(const struct bio_vec *bv,
+ struct bvec_iter *iter,
+ unsigned bytes)
+{
+ return __bvec_iter_advance(bv, iter, bytes, false);
+}
+
+static inline bool mp_bvec_iter_advance(const struct bio_vec *bv,
+ struct bvec_iter *iter,
+ unsigned bytes)
+{
+ return __bvec_iter_advance(bv, iter, bytes, true);
+}
+
#define for_each_bvec(bvl, bio_vec, iter, start) \
for (iter = (start); \
(iter).bi_size && \
--
2.9.5
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