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dm bio prison v1: intelligently size dm_bio_prison's prison_regions

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

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mike Snitzer 2023-03-27 14:30:46 -04:00
parent c6273411d1
commit b6279f82eb
1 changed files with 6 additions and 5 deletions
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11
drivers/md/dm-bio-prison-v1.c
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@ -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);