ceph: name msgpools; useful error messages

Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/msgpool.h

@@ -9,12 +9,14 @@
  * avoid unexpected OOM conditions.
  */
 struct ceph_msgpool {
+	const char *name;
 	mempool_t *pool;
 	int front_len;          /* preallocated payload size */
 };
 
 extern int ceph_msgpool_init(struct ceph_msgpool *pool,
-			     int front_len, int size, bool blocking);
+			     int front_len, int size, bool blocking,
+			     const char *name);
 extern void ceph_msgpool_destroy(struct ceph_msgpool *pool);
 extern struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *,
 					 int front_len);