[PATCH 3/4] rbd: allocate object requests with a slab allocator

[Alex Elder <elder@inktank.com>]

Create a slab cache to manage rbd_obj_request allocation.  We aren't
using a constructor, and we'll zero-fill object request structures
when they're allocated.

This is part of:
    http://tracker.ceph.com/issues/3926

Signed-off-by: Alex Elder <elder@inktank.com>
---
 drivers/block/rbd.c |   23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index da9f41d..28a5ea3 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -346,6 +346,7 @@ static LIST_HEAD(rbd_client_list);		/* clients */
 static DEFINE_SPINLOCK(rbd_client_list_lock);

 static struct kmem_cache	*rbd_img_request_cache;
+static struct kmem_cache	*rbd_obj_request_cache;

 static int rbd_img_request_submit(struct rbd_img_request *img_request);

@@ -1762,7 +1763,7 @@ static struct rbd_obj_request
*rbd_obj_request_create(const char *object_name,
 	if (!name)
 		return NULL;

-	obj_request = kzalloc(sizeof (*obj_request), GFP_KERNEL);
+	obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_KERNEL);
 	if (!obj_request) {
 		kfree(name);
 		return NULL;
@@ -1814,7 +1815,8 @@ static void rbd_obj_request_destroy(struct kref *kref)
 	}

 	kfree(obj_request->object_name);
-	kfree(obj_request);
+	obj_request->object_name = NULL;
+	kmem_cache_free(rbd_obj_request_cache, obj_request);
 }

 /*
@@ -5008,14 +5010,29 @@ static int rbd_slab_init(void)
 					sizeof (struct rbd_img_request),
 					__alignof__(struct rbd_img_request),
 					0, NULL);
-	if (rbd_img_request_cache)
+	if (!rbd_img_request_cache)
+		return -ENOMEM;
+
+	rbd_assert(!rbd_obj_request_cache);
+	rbd_obj_request_cache = kmem_cache_create("rbd_obj_request",
+					sizeof (struct rbd_obj_request),
+					__alignof__(struct rbd_obj_request),
+					0, NULL);
+	if (rbd_obj_request_cache)
 		return 0;

+	kmem_cache_destroy(rbd_img_request_cache);
+	rbd_img_request_cache = NULL;
+
 	return -ENOMEM;
 }

 static void rbd_slab_exit(void)
 {
+	rbd_assert(rbd_obj_request_cache);
+	kmem_cache_destroy(rbd_obj_request_cache);
+	rbd_obj_request_cache = NULL;
+
 	rbd_assert(rbd_img_request_cache);
 	kmem_cache_destroy(rbd_img_request_cache);
 	rbd_img_request_cache = NULL;
-- 
1.7.9.5