dm: remove now unused bio-based io_pool and _io_cache

Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index 8a7dc8f..124ffa2 100644 (file)
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -92,8 +92,6 @@ struct mapped_device {
         * io objects are allocated from here.
         */
        struct bio_set *io_bs;
-       mempool_t *io_pool;
-
        struct bio_set *bs;
 
        /*

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 01d0f9c..4284ad8 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -149,7 +149,6 @@ static int dm_numa_node = DM_NUMA_NODE;
  * For mempools pre-allocation at the table loading time.
  */
 struct dm_md_mempools {
-       mempool_t *io_pool;
        struct bio_set *bs;
        struct bio_set *io_bs;
 };
@@ -160,7 +159,6 @@ struct table_device {
        struct dm_dev dm_dev;
 };
 
-static struct kmem_cache *_io_cache;
 static struct kmem_cache *_rq_tio_cache;
 static struct kmem_cache *_rq_cache;
 
@@ -227,14 +225,9 @@ static int __init local_init(void)
 {
        int r = -ENOMEM;
 
-       /* allocate a slab for the dm_ios */
-       _io_cache = KMEM_CACHE(dm_io, 0);
-       if (!_io_cache)
-               return r;
-
        _rq_tio_cache = KMEM_CACHE(dm_rq_target_io, 0);
        if (!_rq_tio_cache)
-               goto out_free_io_cache;
+               return r;
 
        _rq_cache = kmem_cache_create("dm_old_clone_request", sizeof(struct request),
                                      __alignof__(struct request), 0, NULL);
@@ -269,8 +262,6 @@ out_free_rq_cache:
        kmem_cache_destroy(_rq_cache);
 out_free_rq_tio_cache:
        kmem_cache_destroy(_rq_tio_cache);
-out_free_io_cache:
-       kmem_cache_destroy(_io_cache);
 
        return r;
 }
@@ -282,7 +273,6 @@ static void local_exit(void)
 
        kmem_cache_destroy(_rq_cache);
        kmem_cache_destroy(_rq_tio_cache);
-       kmem_cache_destroy(_io_cache);
        unregister_blkdev(_major, _name);
        dm_uevent_exit();
 
@@ -1698,7 +1688,6 @@ static void cleanup_mapped_device(struct mapped_device *md)
                destroy_workqueue(md->wq);
        if (md->kworker_task)
                kthread_stop(md->kworker_task);
-       mempool_destroy(md->io_pool);
        if (md->bs)
                bioset_free(md->bs);
        if (md->io_bs)
@@ -1881,14 +1870,6 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
                        bioset_free(md->io_bs);
                        md->io_bs = NULL;
                }
-               if (md->io_pool) {
-                       /*
-                        * Reload io_pool because pool_size may have changed
-                        * because a different table was loaded.
-                        */
-                       mempool_destroy(md->io_pool);
-                       md->io_pool = NULL;
-               }
 
        } else if (md->bs) {
                /*
@@ -1902,10 +1883,8 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
                goto out;
        }
 
-       BUG_ON(!p || md->io_pool || md->bs || md->io_bs);
+       BUG_ON(!p || md->bs || md->io_bs);
 
-       md->io_pool = p->io_pool;
-       p->io_pool = NULL;
        md->bs = p->bs;
        p->bs = NULL;
        md->io_bs = p->io_bs;
@@ -2816,9 +2795,6 @@ struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_qu
                        goto out;
                if (integrity && bioset_integrity_create(pools->io_bs, pool_size))
                        goto out;
-               pools->io_pool = mempool_create_slab_pool(pool_size, _io_cache);
-               if (!pools->io_pool)
-                       goto out;
                break;
        case DM_TYPE_REQUEST_BASED:
        case DM_TYPE_MQ_REQUEST_BASED:
@@ -2850,8 +2826,6 @@ void dm_free_md_mempools(struct dm_md_mempools *pools)
        if (!pools)
                return;
 
-       mempool_destroy(pools->io_pool);
-
        if (pools->bs)
                bioset_free(pools->bs);
        if (pools->io_bs)