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block: Add bioset_init()/bioset_exit()

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Similarly to mempool_init()/mempool_exit(), take a pointer indirection
out of allocation/freeing by allowing biosets to be embedded in other
structs.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kent Overstreet 2018-05-08 21:33:51 -04:00 committed by Jens Axboe
parent 8aa6ba2f6e
commit 917a38c71a
2 changed files with 67 additions and 28 deletions
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93
block/bio.c
View File

@ -1856,21 +1856,83 @@ int biovec_init_pool(mempool_t *pool, int pool_entries)
return mempool_init_slab_pool(pool, pool_entries, bp->slab);
}
void bioset_free(struct bio_set *bs)
/*
* bioset_exit - exit a bioset initialized with bioset_init()
*
* May be called on a zeroed but uninitialized bioset (i.e. allocated with
* kzalloc()).
*/
void bioset_exit(struct bio_set *bs)
{
if (bs->rescue_workqueue)
destroy_workqueue(bs->rescue_workqueue);
bs->rescue_workqueue = NULL;
mempool_exit(&bs->bio_pool);
mempool_exit(&bs->bvec_pool);
bioset_integrity_free(bs);
bio_put_slab(bs);
if (bs->bio_slab)
bio_put_slab(bs);
bs->bio_slab = NULL;
}
EXPORT_SYMBOL(bioset_exit);
void bioset_free(struct bio_set *bs)
{
bioset_exit(bs);
kfree(bs);
}
EXPORT_SYMBOL(bioset_free);
/**
* bioset_init - Initialize a bio_set
* @pool_size: Number of bio and bio_vecs to cache in the mempool
* @front_pad: Number of bytes to allocate in front of the returned bio
* @flags: Flags to modify behavior, currently %BIOSET_NEED_BVECS
* and %BIOSET_NEED_RESCUER
*
* Similar to bioset_create(), but initializes a passed-in bioset instead of
* separately allocating it.
*/
int bioset_init(struct bio_set *bs,
unsigned int pool_size,
unsigned int front_pad,
int flags)
{
unsigned int back_pad = BIO_INLINE_VECS * sizeof(struct bio_vec);
bs->front_pad = front_pad;
spin_lock_init(&bs->rescue_lock);
bio_list_init(&bs->rescue_list);
INIT_WORK(&bs->rescue_work, bio_alloc_rescue);
bs->bio_slab = bio_find_or_create_slab(front_pad + back_pad);
if (!bs->bio_slab)
return -ENOMEM;
if (mempool_init_slab_pool(&bs->bio_pool, pool_size, bs->bio_slab))
goto bad;
if ((flags & BIOSET_NEED_BVECS) &&
biovec_init_pool(&bs->bvec_pool, pool_size))
goto bad;
if (!(flags & BIOSET_NEED_RESCUER))
return 0;
bs->rescue_workqueue = alloc_workqueue("bioset", WQ_MEM_RECLAIM, 0);
if (!bs->rescue_workqueue)
goto bad;
return 0;
bad:
bioset_exit(bs);
return -ENOMEM;
}
EXPORT_SYMBOL(bioset_init);
/**
* bioset_create - Create a bio_set
* @pool_size: Number of bio and bio_vecs to cache in the mempool
@ -1895,43 +1957,18 @@ struct bio_set *bioset_create(unsigned int pool_size,
unsigned int front_pad,
int flags)
{
unsigned int back_pad = BIO_INLINE_VECS * sizeof(struct bio_vec);
struct bio_set *bs;
bs = kzalloc(sizeof(*bs), GFP_KERNEL);
if (!bs)
return NULL;
bs->front_pad = front_pad;
spin_lock_init(&bs->rescue_lock);
bio_list_init(&bs->rescue_list);
INIT_WORK(&bs->rescue_work, bio_alloc_rescue);
bs->bio_slab = bio_find_or_create_slab(front_pad + back_pad);
if (!bs->bio_slab) {
if (bioset_init(bs, pool_size, front_pad, flags)) {
kfree(bs);
return NULL;
}
if (mempool_init_slab_pool(&bs->bio_pool, pool_size, bs->bio_slab))
goto bad;
if ((flags & BIOSET_NEED_BVECS) &&
biovec_init_pool(&bs->bvec_pool, pool_size))
goto bad;
if (!(flags & BIOSET_NEED_RESCUER))
return bs;
bs->rescue_workqueue = alloc_workqueue("bioset", WQ_MEM_RECLAIM, 0);
if (!bs->rescue_workqueue)
goto bad;
return bs;
bad:
bioset_free(bs);
return NULL;
}
EXPORT_SYMBOL(bioset_create);

2
include/linux/bio.h
View File

@ -406,6 +406,8 @@ static inline struct bio *bio_next_split(struct bio *bio, int sectors,
return bio_split(bio, sectors, gfp, bs);
}
extern int bioset_init(struct bio_set *, unsigned int, unsigned int, int flags);
extern void bioset_exit(struct bio_set *);
extern struct bio_set *bioset_create(unsigned int, unsigned int, int flags);
enum {
BIOSET_NEED_BVECS = BIT(0),