Commit b6279f82 authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm bio prison v1: intelligently size dm_bio_prison's prison_regions 



Size the dm_bio_prison's number of prison_region structs using
dm_num_hash_locks().

Signed-off-by: default avatarMike Snitzer <snitzer@kernel.org>
parent c6273411

drivers/md/dm-bio-prison-v1.c

+6 −5
Original line number Diff line number Diff line
@@ -16,7 +16,6 @@ 


/*----------------------------------------------------------------*/



#define NR_LOCKS 64

#define MIN_CELLS 1024



struct prison_region {
@@ -27,7 +26,7 @@ struct prison_region { 
struct dm_bio_prison {

	mempool_t cell_pool;

	unsigned int num_locks;

	struct prison_region regions[NR_LOCKS];

	struct prison_region regions[];

};



static struct kmem_cache *_cell_cache;
@@ -41,12 +40,14 @@ static struct kmem_cache *_cell_cache; 
struct dm_bio_prison *dm_bio_prison_create(void)

{

	int ret;

	unsigned i;

	struct dm_bio_prison *prison = kzalloc(sizeof(*prison), GFP_KERNEL);

	unsigned int i, num_locks;

	struct dm_bio_prison *prison;



	num_locks = dm_num_hash_locks();

	prison = kzalloc(struct_size(prison, regions, num_locks), GFP_KERNEL);

	if (!prison)

		return NULL;

	prison->num_locks = NR_LOCKS;

	prison->num_locks = num_locks;



	for (i = 0; i < prison->num_locks; i++) {

		spin_lock_init(&prison->regions[i].lock);