X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fbio.h;h=18462c5b8fff91e0b4d5341dac07e4e263907690;hb=f8d665422603ee1b8ed04dcad4242f14d623c941;hp=6a642098e5c3524ad69fd15993268f35ef02cad9;hpb=4d9c6a21befe6c73c35f2799c7e25a9eda82a95d;p=linux-2.6-omap-h63xx.git

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 6a642098e5c..18462c5b8ff 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -90,10 +90,11 @@ struct bio {
 
 	unsigned int		bi_comp_cpu;	/* completion CPU */
 
+	atomic_t		bi_cnt;		/* pin count */
+
 	struct bio_vec		*bi_io_vec;	/* the actual vec list */
 
 	bio_end_io_t		*bi_end_io;
-	atomic_t		bi_cnt;		/* pin count */
 
 	void			*bi_private;
 #if defined(CONFIG_BLK_DEV_INTEGRITY)
@@ -101,6 +102,13 @@ struct bio {
 #endif
 
 	bio_destructor_t	*bi_destructor;	/* destructor */
+
+	/*
+	 * We can inline a number of vecs at the end of the bio, to avoid
+	 * double allocations for a small number of bio_vecs. This member
+	 * MUST obviously be kept at the very end of the bio.
+	 */
+	struct bio_vec		bi_inline_vecs[0];
 };
 
 /*
@@ -117,6 +125,7 @@ struct bio {
 #define BIO_CPU_AFFINE	8	/* complete bio on same CPU as submitted */
 #define BIO_NULL_MAPPED 9	/* contains invalid user pages */
 #define BIO_FS_INTEGRITY 10	/* fs owns integrity data, not block layer */
+#define BIO_QUIET	11	/* Make BIO Quiet */
 #define bio_flagged(bio, flag)	((bio)->bi_flags & (1 << (flag)))
 
 /*
@@ -211,6 +220,11 @@ static inline void *bio_data(struct bio *bio)
 	return NULL;
 }
 
+static inline int bio_has_allocated_vec(struct bio *bio)
+{
+	return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
+}
+
 /*
  * will die
  */
@@ -332,7 +346,7 @@ struct bio_pair {
 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
 extern void bio_pair_release(struct bio_pair *dbio);
 
-extern struct bio_set *bioset_create(int, int);
+extern struct bio_set *bioset_create(unsigned int, unsigned int);
 extern void bioset_free(struct bio_set *);
 
 extern struct bio *bio_alloc(gfp_t, int);
@@ -377,6 +391,7 @@ extern struct bio *bio_copy_user_iov(struct request_queue *,
 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 void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
 extern unsigned int bvec_nr_vecs(unsigned short idx);
 
 /*
@@ -395,13 +410,17 @@ static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
  */
 #define BIO_POOL_SIZE 2
 #define BIOVEC_NR_POOLS 6
+#define BIOVEC_MAX_IDX	(BIOVEC_NR_POOLS - 1)
 
 struct bio_set {
+	struct kmem_cache *bio_slab;
+	unsigned int front_pad;
+
 	mempool_t *bio_pool;
 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 	mempool_t *bio_integrity_pool;
 #endif
-	mempool_t *bvec_pools[BIOVEC_NR_POOLS];
+	mempool_t *bvec_pool;
 };
 
 struct biovec_slab {
@@ -411,6 +430,7 @@ struct biovec_slab {
 };
 
 extern struct bio_set *fs_bio_set;
+extern struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly;
 
 /*
  * a small number of entries is fine, not going to be performance critical.