rbd: allocate name separate from obj_request

The next patch will define a slab allocator for a object requests.
To use that we'll need to allocate the name of an object separate
from the request structure itself.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index e90abde..d74be04 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1758,11 +1758,16 @@ static struct rbd_obj_request *rbd_obj_request_create(const char *object_name,
        rbd_assert(obj_request_type_valid(type));
 
        size = strlen(object_name) + 1;
-       obj_request = kzalloc(sizeof (*obj_request) + size, GFP_KERNEL);
-       if (!obj_request)
+       name = kmalloc(size, GFP_KERNEL);
+       if (!name)
+               return NULL;
+
+       obj_request = kzalloc(sizeof (*obj_request), GFP_KERNEL);
+       if (!obj_request) {
+               kfree(name);
                return NULL;
+       }
 
-       name = (char *)(obj_request + 1);
        obj_request->object_name = memcpy(name, object_name, size);
        obj_request->offset = offset;
        obj_request->length = length;
@@ -1808,6 +1813,7 @@ static void rbd_obj_request_destroy(struct kref *kref)
                break;
        }
 
+       kfree(obj_request->object_name);
        kfree(obj_request);
 }