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Subject[PATCH 04/13] block: Add bio_clone_kmalloc()
Date
From: Kent Overstreet <koverstreet@google.com>

Signed-off-by: Kent Overstreet <koverstreet@google.com>
---
drivers/block/osdblk.c | 3 +--
drivers/block/rbd.c | 8 ++------
fs/bio.c | 13 +++++++++++++
fs/exofs/ore.c | 5 ++---
include/linux/bio.h | 1 +
5 files changed, 19 insertions(+), 11 deletions(-)
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/block/rbd.c b/drivers/block/rbd.c
index 013c7a5..5a953c6 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -729,7 +729,7 @@ static struct bio *bio_chain_clone(struct bio **old, struct bio **next,
}

while (old_chain && (total < len)) {
- tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs);
+ tmp = bio_clone_kmalloc(old_chain, gfpmask);
if (!tmp)
goto err_out;

@@ -751,13 +751,9 @@ static struct bio *bio_chain_clone(struct bio **old, struct bio **next,
if (!bp)
goto err_out;

- __bio_clone(tmp, &bp->bio1);
-
*next = &bp->bio2;
- } else {
- __bio_clone(tmp, old_chain);
+ } else
*next = old_chain->bi_next;
- }

tmp->bi_bdev = NULL;
gfpmask &= ~__GFP_WAIT;
diff --git a/fs/bio.c b/fs/bio.c
index 4cb621f..e2c0970 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -491,6 +491,19 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
}
EXPORT_SYMBOL(bio_clone);

+struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
+{
+ struct bio *b = bio_kmalloc(gfp_mask, bio->bi_max_vecs);
+
+ if (!b)
+ return NULL;
+
+ __bio_clone(b, bio);
+
+ return b;
+}
+EXPORT_SYMBOL(bio_clone_kmalloc);
+
/**
* bio_get_nr_vecs - return approx number of vecs
* @bdev: I/O target
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index 49cf230..95c7264 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -820,8 +820,8 @@ 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",
@@ -830,7 +830,6 @@ 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 e068a68..b27f16b 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -225,6 +225,7 @@ 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);
+struct bio *bio_clone_kmalloc(struct bio *, gfp_t);

extern void bio_init(struct bio *);

--
1.7.9.rc2


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