linux-kernel - [PATCH 2 of 7] block: Globalize bio_set and bio_vec

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Date:	Sat, 07 Jun 2008 00:55:35 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: [PATCH 2 of 7] block: Globalize bio_set and bio_vec_slab

2 files changed, 38 insertions(+), 28 deletions(-)
fs/bio.c            |   36 ++++++++----------------------------
include/linux/bio.h |   30 ++++++++++++++++++++++++++++++


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@...cle.com>

---

diff -r fb6f53e13ff3 -r 550d61001baa fs/bio.c
--- a/fs/bio.c	Sat Jun 07 00:45:14 2008 -0400
+++ b/fs/bio.c	Sat Jun 07 00:45:14 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 +45,18 @@
 #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)
+inline int bvec_nr_vecs(int idx)
+{
+	return bvec_slabs[idx].nr_vecs;
+}
+EXPORT_SYMBOL(bvec_nr_vecs);
+
+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 fb6f53e13ff3 -r 550d61001baa include/linux/bio.h
--- a/include/linux/bio.h	Sat Jun 07 00:45:14 2008 -0400
+++ b/include/linux/bio.h	Sat Jun 07 00:45:14 2008 -0400
@@ -333,6 +333,36 @@
 				     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 *);
+extern inline int bvec_nr_vecs(int idx);
+
+/*
+ * 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
 /*


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