diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index f88eacb111d4151dc5491797fe0e03faaadc26a9..7c05ac202d90650069d4713ac2e13b3be9b86024 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -10,6 +10,12 @@
 #include "osdmap.h"
 #include "messenger.h"
 
+/* 
+ * Maximum object name size 
+ * (must be at least as big as RBD_MAX_MD_NAME_LEN -- currently 100) 
+ */
+#define MAX_OBJ_NAME_SIZE 100
+
 struct ceph_msg;
 struct ceph_snap_context;
 struct ceph_osd_request;
@@ -75,7 +81,7 @@ struct ceph_osd_request {
 	struct inode *r_inode;         	      /* for use by callbacks */
 	void *r_priv;			      /* ditto */
 
-	char              r_oid[40];          /* object name */
+	char              r_oid[MAX_OBJ_NAME_SIZE];          /* object name */
 	int               r_oid_len;
 	unsigned long     r_stamp;            /* send OR check time */
 
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 733e46008b89d6e67397d779edf9ccb5cb3e5c8a..f4f3f58f5234c1a5ce5eb4b54638c730f571ffb9 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -244,7 +244,7 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 		ceph_pagelist_init(req->r_trail);
 	}
 	/* create request message; allow space for oid */
-	msg_size += 40;
+	msg_size += MAX_OBJ_NAME_SIZE;
 	if (snapc)
 		msg_size += sizeof(u64) * snapc->num_snaps;
 	if (use_mempool)