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Subject[PATCH 03/13] block: Add bio_clone_bioset()
Date
From: Kent Overstreet <koverstreet@google.com>

This consolidates some code, and will help in a later patch changing how
bio cloning works.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
---
block/blk-core.c | 8 +-------
drivers/md/dm.c | 27 ++++++++++-----------------
drivers/md/md.c | 18 +-----------------
fs/bio.c | 16 ++++++++++++----
include/linux/bio.h | 1 +
5 files changed, 25 insertions(+), 45 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 1f61b74..91617eb 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2660,16 +2660,10 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
blk_rq_init(NULL, rq);

__rq_for_each_bio(bio_src, rq_src) {
- bio = bio_alloc_bioset(gfp_mask, bio_src->bi_max_vecs, bs);
+ bio = bio_clone_bioset(bio_src, gfp_mask, bs);
if (!bio)
goto free_and_out;

- __bio_clone(bio, bio_src);
-
- if (bio_integrity(bio_src) &&
- bio_integrity_clone(bio, bio_src, gfp_mask, bs))
- goto free_and_out;
-
if (bio_ctr && bio_ctr(bio, bio_src, data))
goto free_and_out;

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 3cc2169..3e33039 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1072,26 +1072,19 @@ static struct bio *split_bvec(struct bio *bio, sector_t sector,
* Creates a bio that consists of range of complete bvecs.
*/
static struct bio *clone_bio(struct bio *bio, sector_t sector,
- unsigned short idx, unsigned short bv_count,
+ unsigned short bv_count,
unsigned int len, struct bio_set *bs)
{
struct bio *clone;

- clone = bio_alloc_bioset(GFP_NOIO, bio->bi_max_vecs, bs);
- __bio_clone(clone, bio);
+ clone = bio_clone_bioset(bio, GFP_NOIO, bs);
clone->bi_sector = sector;
- clone->bi_idx = idx;
- clone->bi_vcnt = idx + bv_count;
+ clone->bi_vcnt = bv_count;
clone->bi_size = to_bytes(len);
- clone->bi_flags &= ~(1 << BIO_SEG_VALID);

- if (bio_integrity(bio)) {
- bio_integrity_clone(clone, bio, GFP_NOIO, bs);
-
- if (idx != bio->bi_idx || clone->bi_size < bio->bi_size)
- bio_integrity_trim(clone,
- bio_sector_offset(bio, idx, 0), len);
- }
+ if (bio_integrity(bio) &&
+ clone->bi_size < bio->bi_size)
+ bio_integrity_trim(clone, 0, len);

return clone;
}
@@ -1121,8 +1114,8 @@ static void __issue_target_request(struct clone_info *ci, struct dm_target *ti,
* ci->bio->bi_max_vecs is BIO_INLINE_VECS anyway, for both flush
* and discard, so no need for concern about wasted bvec allocations.
*/
- clone = bio_alloc_bioset(GFP_NOIO, ci->bio->bi_max_vecs, ci->md->bs);
- __bio_clone(clone, ci->bio);
+ clone = bio_clone_bioset(ci->bio, GFP_NOIO, ci->md->bs);
+
if (len) {
clone->bi_sector = ci->sector;
clone->bi_size = to_bytes(len);
@@ -1161,7 +1154,7 @@ static void __clone_and_map_simple(struct clone_info *ci, struct dm_target *ti)
struct dm_target_io *tio;

tio = alloc_tio(ci, ti);
- clone = clone_bio(bio, ci->sector, ci->idx,
+ clone = clone_bio(bio, ci->sector,
bio->bi_vcnt - ci->idx, ci->sector_count,
ci->md->bs);
__map_bio(ti, clone, tio);
@@ -1240,7 +1233,7 @@ static int __clone_and_map(struct clone_info *ci)
}

tio = alloc_tio(ci, ti);
- clone = clone_bio(bio, ci->sector, ci->idx, i - ci->idx, len,
+ clone = clone_bio(bio, ci->sector, i - ci->idx, len,
ci->md->bs);
__map_bio(ti, clone, tio);

diff --git a/drivers/md/md.c b/drivers/md/md.c
index a5a524e..47605e7 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -178,23 +178,7 @@ struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
if (!mddev || !mddev->bio_set)
return bio_clone(bio, gfp_mask);

- b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, mddev->bio_set);
- if (!b)
- return NULL;
-
- __bio_clone(b, bio);
- if (bio_integrity(bio)) {
- int ret;
-
- ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
-
- if (ret < 0) {
- bio_put(b);
- return NULL;
- }
- }
-
- return b;
+ return bio_clone_bioset(gfp_mask, bio_segments(bio), mddev->bio_set);
}
EXPORT_SYMBOL_GPL(bio_clone_mddev);

diff --git a/fs/bio.c b/fs/bio.c
index 3667cef..4cb621f 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -453,15 +453,17 @@ void __bio_clone(struct bio *bio, struct bio *bio_src)
EXPORT_SYMBOL(__bio_clone);

/**
- * bio_clone - clone a bio
+ * bio_clone_bioset - clone a bio
* @bio: bio to clone
* @gfp_mask: allocation priority
+ * @bs: bio_set to allocate from
*
* Like __bio_clone, only also allocates the returned bio
*/
-struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
+struct bio *bio_clone_bioset(struct bio *bio, gfp_t gfp_mask,
+ struct bio_set *bs)
{
- struct bio *b = bio_alloc(gfp_mask, bio->bi_max_vecs);
+ struct bio *b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, bs);

if (!b)
return NULL;
@@ -471,7 +473,7 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
if (bio_integrity(bio)) {
int ret;

- ret = bio_integrity_clone(b, bio, gfp_mask, fs_bio_set);
+ ret = bio_integrity_clone(b, bio, gfp_mask, bs);

if (ret < 0) {
bio_put(b);
@@ -481,6 +483,12 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)

return b;
}
+EXPORT_SYMBOL(bio_clone_bioset);
+
+struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
+{
+ return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
+}
EXPORT_SYMBOL(bio_clone);

/**
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 4d94eb8..e068a68 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -223,6 +223,7 @@ struct request_queue;
extern int bio_phys_segments(struct request_queue *, struct bio *);

extern void __bio_clone(struct bio *, struct bio *);
+extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
extern struct bio *bio_clone(struct bio *, gfp_t);

extern void bio_init(struct bio *);
--
1.7.9.rc2


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