nfsd4: track recall retries in nfs4_delegation

Move this out of a local variable into the nfs4_delegation object in
preparation for making this an async rpc call (at which point we'll need
any state like this in a common object that's preserved across function
calls).
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

fs/nfsd/nfs4callback.c

@@ -507,11 +507,11 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
 		.rpc_argp = dp,
 		.rpc_cred = clp->cl_cb_conn.cb_cred
 	};
-	int retries = 1;
 	int status = 0;
 
+	dp->dl_retries = 1;
 	status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
-	while (retries--) {
+	while (dp->dl_retries--) {
 		switch (status) {
 			case -EIO:
 				/* Network partition? */

include/linux/nfsd/state.h

@@ -76,6 +76,7 @@ struct nfs4_delegation {
 	u32			dl_ident;
 	stateid_t		dl_stateid;
 	struct knfsd_fh		dl_fh;
+	int			dl_retries;
 };
 
 /* client delegation callback info */