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Message-ID: <20120809070247.GC9128@dhcp-172-18-216-138.mtv.corp.google.com>
Date: Thu, 9 Aug 2012 03:02:47 -0400
From: Kent Overstreet <koverstreet@...gle.com>
To: Tejun Heo <tj@...nel.org>
Cc: linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
dm-devel@...hat.com, axboe@...nel.dk, agk@...hat.com,
neilb@...e.de, drbd-dev@...ts.linbit.com, vgoyal@...hat.com,
mpatocka@...hat.com, sage@...dream.net, yehuda@...newdream.net
Subject: Re: [PATCH v5 10/12] block: Add bio_clone_kmalloc()
On Wed, Aug 08, 2012 at 11:55:04PM -0700, Tejun Heo wrote:
> On Wed, Aug 08, 2012 at 06:57:04PM -0700, Kent Overstreet wrote:
> > That means bio_clone_kmalloc will just become:
> >
> > static inline struct bio *bio_clone_kmalloc(struct bio *bio,
> > gfp_t gfp_mask)
> > {
> > return bio_clone_bioset(bio, gfp_mask, BIO_KMALLOC_POOL)
> > }
> >
> > (or maybe NULL there, I think using NULL for the interface makes sense,
> > I just don't want to use it for bi_pool).
> >
> > Do you still want the /** for a one line wrapper like that?
>
> I don't know. But do you think you can do similar thing to alloc
> interface too?
Already did:
commit 313e0a46b1681a8e02b2fe9a86cfc3b82599be58
Author: Kent Overstreet <koverstreet@...gle.com>
Date: Wed Aug 8 20:30:16 2012 -0700
block: Add bio_clone_bioset(), bio_clone_kmalloc()
Previously, there was bio_clone() but it only allocated from the fs bio
set; as a result various users were open coding it and using
__bio_clone().
This changes bio_clone() to become bio_clone_bioset(), and then we add
bio_clone() and bio_clone_kmalloc() as wrappers around it, making use of
the functionality the last patch adedd.
This will also help in a later patch changing how bio cloning works.
Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
diff --git a/block/blk-core.c b/block/blk-core.c
index e9058c2..10a6e08 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2768,16 +2768,10 @@ 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/block/osdblk.c b/drivers/block/osdblk.c
index 87311eb..1bbc681 100644
--- a/drivers/block/osdblk.c
+++ b/drivers/block/osdblk.c
@@ -266,11 +266,10 @@ static struct bio *bio_chain_clone(struct bio *old_chain, gfp_t gfpmask)
struct bio *tmp, *new_chain = NULL, *tail = NULL;
while (old_chain) {
- tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs);
+ tmp = bio_clone_kmalloc(old_chain, gfpmask);
if (!tmp)
goto err_out;
- __bio_clone(tmp, old_chain);
tmp->bi_bdev = NULL;
gfpmask &= ~__GFP_WAIT;
tmp->bi_next = NULL;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index a8f5cdc..d978f7e 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1105,8 +1105,8 @@ 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);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index f9d16dc..069c3bc 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -173,28 +173,10 @@ EXPORT_SYMBOL_GPL(bio_alloc_mddev);
struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
struct mddev *mddev)
{
- struct bio *b;
-
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(bio, gfp_mask, mddev->bio_set);
}
EXPORT_SYMBOL_GPL(bio_clone_mddev);
diff --git a/fs/bio.c b/fs/bio.c
index c0b9bf3..71f1ac5 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -419,16 +419,19 @@ 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;
+ b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, bs);
if (!b)
return NULL;
@@ -437,7 +440,7 @@ 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);
@@ -447,7 +450,7 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
return b;
}
-EXPORT_SYMBOL(bio_clone);
+EXPORT_SYMBOL(bio_clone_bioset);
/**
* bio_get_nr_vecs - return approx number of vecs
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index 24a49d4..a8d92fc 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -814,8 +814,8 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
struct bio *bio;
if (per_dev != master_dev) {
- bio = bio_kmalloc(GFP_KERNEL,
- master_dev->bio->bi_max_vecs);
+ bio = bio_clone_kmalloc(master_dev->bio,
+ GFP_KERNEL);
if (unlikely(!bio)) {
ORE_DBGMSG(
"Failed to allocate BIO size=%u\n",
@@ -824,7 +824,6 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
goto out;
}
- __bio_clone(bio, master_dev->bio);
bio->bi_bdev = NULL;
bio->bi_next = NULL;
per_dev->offset = master_dev->offset;
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 3e2686f..9e2c9a5 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -213,6 +213,9 @@ extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
extern void bio_put(struct bio *);
extern void bio_free(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_set *fs_bio_set;
static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
@@ -220,6 +223,11 @@ static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
}
+static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
+{
+ return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
+}
+
#define BIO_KMALLOC_POOL ((void *) ~0)
static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
@@ -227,13 +235,16 @@ static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
return bio_alloc_bioset(gfp_mask, nr_iovecs, BIO_KMALLOC_POOL);
}
+static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
+{
+ return bio_clone_bioset(bio, gfp_mask, BIO_KMALLOC_POOL);
+
+}
+
extern void bio_endio(struct bio *, int);
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(struct bio *, gfp_t);
-
extern void bio_init(struct bio *);
extern void bio_reset(struct bio *);
--
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