[PATCH 1 of 3] block: Globalize bio_set and bio_vec_slab

Martin K. Petersen
2008-06-16T04:13:30Z

Move struct bio_set and biovec_slab definitions to bio.h so they can
be used outside of bio.c.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>

---
2 files changed, 31 insertions(+), 28 deletions(-)
fs/bio.c | 30 ++----------------------------
include/linux/bio.h | 29 +++++++++++++++++++++++++++++

diff -r f753fd8c4dee -r 24902abbf2b6 fs/bio.c
--- a/fs/bio.c Fri Jun 13 19:24:49 2008 -0400
+++ b/fs/bio.c Fri Jun 13 19:24:49 2008 -0400
@@ -28,24 +28,9 @@
#include <linux/blktrace_api.h>
#include <scsi/sg.h> /* for struct sg_iovec */

-#define BIO_POOL_SIZE 2
-
static struct kmem_cache *bio_slab __read_mostly;

-#define BIOVEC_NR_POOLS 6
-
-/*
- * a small number of entries is fine, not going to be performance critical.
- * basically we just need to survive
- */
-#define BIO_SPLIT_ENTRIES 2
mempool_t *bio_split_pool __read_mostly;
-
-struct biovec_slab {
- int nr_vecs;
- char *name;
- struct kmem_cache *slab;
-};

/*
* if you change this list, also change bvec_alloc or things will
@@ -60,23 +45,12 @@
#undef BV

/*
- * bio_set is used to allow other portions of the IO system to
- * allocate their own private memory pools for bio and iovec structures.
- * These memory pools in turn all allocate from the bio_slab
- * and the bvec_slabs[].
- */
-struct bio_set {
- mempool_t *bio_pool;
- mempool_t *bvec_pools[BIOVEC_NR_POOLS];
-};
-
-/*
* fs_bio_set is the bio_set containing bio and iovec memory pools used by
* IO code that does not need private memory pools.
*/
-static struct bio_set *fs_bio_set;
+struct bio_set *fs_bio_set;

-static inline struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs)
+struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs)
{
struct bio_vec *bvl;

diff -r f753fd8c4dee -r 24902abbf2b6 include/linux/bio.h
--- a/include/linux/bio.h Fri Jun 13 19:24:49 2008 -0400
+++ b/include/linux/bio.h Fri Jun 13 19:24:49 2008 -0400
@@ -333,6 +333,35 @@
int, int);
extern int bio_uncopy_user(struct bio *);
void zero_fill_bio(struct bio *bio);
+extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
+
+/*
+ * bio_set is used to allow other portions of the IO system to
+ * allocate their own private memory pools for bio and iovec structures.
+ * These memory pools in turn all allocate from the bio_slab
+ * and the bvec_slabs[].
+ */
+#define BIO_POOL_SIZE 2
+#define BIOVEC_NR_POOLS 6
+
+struct bio_set {
+ mempool_t *bio_pool;
+ mempool_t *bvec_pools[BIOVEC_NR_POOLS];
+};
+
+struct biovec_slab {
+ int nr_vecs;
+ char *name;
+ struct kmem_cache *slab;
+};
+
+extern struct bio_set *fs_bio_set;
+
+/*
+ * a small number of entries is fine, not going to be performance critical.
+ * basically we just need to survive
+ */
+#define BIO_SPLIT_ENTRIES 2

#ifdef CONFIG_HIGHMEM
/*