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block: simplify and cleanup bvec pool handling

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Instead of a flag and an index just make sure an index of 0 means
no need to free the bvec array.  Also move the constants related
to the bvec pools together and use a consistent naming scheme for
them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
2016-07-19 11:28:42 +02:00
committed by Jens Axboe
parent 70246286e9
commit ed996a52c8
5 changed files with 36 additions and 30 deletions
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2
include/linux/bio.h
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@@ -715,8 +715,6 @@ static inline void bio_inc_remaining(struct bio *bio)
* and the bvec_slabs[].
*/
#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;

22
include/linux/blk_types.h
View File

@@ -134,19 +134,25 @@ struct bio {
/*
* Flags starting here get preserved by bio_reset() - this includes
* BIO_POOL_IDX()
* BVEC_POOL_IDX()
*/
#define BIO_RESET_BITS 13
#define BIO_OWNS_VEC 13 /* bio_free() should free bvec */
/*
* top 4 bits of bio flags indicate the pool this bio came from
* We support 6 different bvec pools, the last one is magic in that it
* is backed by a mempool.
*/
#define BIO_POOL_BITS (4)
#define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1)
#define BIO_POOL_OFFSET (32 - BIO_POOL_BITS)
#define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
#define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
#define BVEC_POOL_NR 6
#define BVEC_POOL_MAX (BVEC_POOL_NR - 1)
/*
* Top 4 bits of bio flags indicate the pool the bvecs came from. We add
* 1 to the actual index so that 0 indicates that there are no bvecs to be
* freed.
*/
#define BVEC_POOL_BITS (4)
#define BVEC_POOL_OFFSET (32 - BVEC_POOL_BITS)
#define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET)
#endif /* CONFIG_BLOCK */