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Subject[PATCH] Add gfp_mask to bio_integrity_clone()
Hi Martin,

What do you think about adding gfp_mask parameter to bio_integrity_clone()
like the attached patch?

Kiyoshi Ueda and I are working on request-based device-mapper (*1)
and it clones bios like the existing bio-based dm.
However, since the request cloning may happen in interrupt context,
GFP_ATOMIC is used in our case (*2).

(*1) http://lkml.org/lkml/2008/10/3/177
(*2) http://lkml.org/lkml/2008/10/3/188

To cope with cloning the integrity payload,
we want to pass gfp_mask to bio_integrity_clone().

It also seems natural to inherit gfp_mask from bio_clone when
bio_integrity_clone is called from it.
Since bio_clone() is the only caller of bio_integrity_clone() in 2.6.28-rc2
and all in-tree callers of bio_clone() are using GFP_NOIO,
the patch does nothing other than changing the interface.


Add gfp_mask parameter to bio_integrity_clone().

Stricter gfp_mask might be required for clone allocation.
For example, request-based dm may clone bio in interrupt context
so it has to use GFP_ATOMIC.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Alasdair G Kergon <agk@redhat.com>

---
fs/bio-integrity.c | 5 +++--
fs/bio.c | 2 +-
include/linux/bio.h | 4 ++--
3 files changed, 6 insertions(+), 5 deletions(-)

Index: linux-2.6.28-rc2/fs/bio-integrity.c
===================================================================
--- linux-2.6.28-rc2.orig/fs/bio-integrity.c
+++ linux-2.6.28-rc2/fs/bio-integrity.c
@@ -681,19 +681,20 @@ EXPORT_SYMBOL(bio_integrity_split);
* bio_integrity_clone - Callback for cloning bios with integrity metadata
* @bio: New bio
* @bio_src: Original bio
+ * @gfp_mask: Memory allocation mask
* @bs: bio_set to allocate bip from
*
* Description: Called to allocate a bip when cloning a bio
*/
int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
- struct bio_set *bs)
+ gfp_t gfp_mask, struct bio_set *bs)
{
struct bio_integrity_payload *bip_src = bio_src->bi_integrity;
struct bio_integrity_payload *bip;

BUG_ON(bip_src == NULL);

- bip = bio_integrity_alloc_bioset(bio, GFP_NOIO, bip_src->bip_vcnt, bs);
+ bip = bio_integrity_alloc_bioset(bio, gfp_mask, bip_src->bip_vcnt, bs);

if (bip == NULL)
return -EIO;
Index: linux-2.6.28-rc2/include/linux/bio.h
===================================================================
--- linux-2.6.28-rc2.orig/include/linux/bio.h
+++ linux-2.6.28-rc2/include/linux/bio.h
@@ -496,7 +496,7 @@ extern void bio_integrity_endio(struct b
extern void bio_integrity_advance(struct bio *, unsigned int);
extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
-extern int bio_integrity_clone(struct bio *, struct bio *, struct bio_set *);
+extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
extern int bioset_integrity_create(struct bio_set *, int);
extern void bioset_integrity_free(struct bio_set *);
extern void bio_integrity_init_slab(void);
@@ -507,7 +507,7 @@ extern void bio_integrity_init_slab(void
#define bioset_integrity_create(a, b) (0)
#define bio_integrity_prep(a) (0)
#define bio_integrity_enabled(a) (0)
-#define bio_integrity_clone(a, b, c) (0)
+#define bio_integrity_clone(a, b, c, d) (0)
#define bioset_integrity_free(a) do { } while (0)
#define bio_integrity_free(a, b) do { } while (0)
#define bio_integrity_endio(a, b) do { } while (0)
Index: linux-2.6.28-rc2/fs/bio.c
===================================================================
--- linux-2.6.28-rc2.orig/fs/bio.c
+++ linux-2.6.28-rc2/fs/bio.c
@@ -309,7 +309,7 @@ struct bio *bio_clone(struct bio *bio, g
if (bio_integrity(bio)) {
int ret;

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

if (ret < 0)
return NULL;

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