NFSv4: Don't loop forever on state recovery failure...

If the server is broken, then retrying forever won't fix it. We
should just give up after a while, and return an error to the user.
We set the number of retries to 10 for now...

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 12 insertions, 6 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 6917311f201c..d95f7f9e60c4 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -61,6 +61,8 @@
 #define NFS4_POLL_RETRY_MIN     (HZ/10)
 #define NFS4_POLL_RETRY_MAX     (15*HZ)
 
+#define NFS4_MAX_LOOP_ON_RECOVER (10)
+
 struct nfs4_opendata;
 static int _nfs4_proc_open(struct nfs4_opendata *data);
 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
@@ -426,17 +428,19 @@ out:
 static int nfs4_recover_session(struct nfs4_session *session)
 {
         struct nfs_client *clp = session->clp;
+        unsigned int loop;
         int ret;
 
-        for (;;) {
+        for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
                 ret = nfs4_wait_clnt_recover(clp);
                 if (ret != 0)
-                                return ret;
+                        break;
                 if (!test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
                         break;
                 nfs4_schedule_state_manager(clp);
+                ret = -EIO;
         }
-        return 0;
+        return ret;
 }
 
 static int nfs41_setup_sequence(struct nfs4_session *session,
@@ -1444,18 +1448,20 @@ static int _nfs4_proc_open(struct nfs4_opendata *data)
 static int nfs4_recover_expired_lease(struct nfs_server *server)
 {
         struct nfs_client *clp = server->nfs_client;
+        unsigned int loop;
         int ret;
 
-        for (;;) {
+        for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
                 ret = nfs4_wait_clnt_recover(clp);
                 if (ret != 0)
-                        return ret;
+                        break;
                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
                         break;
                 nfs4_schedule_state_recovery(clp);
+                ret = -EIO;
         }
-        return 0;
+        return ret;
 }
 
 /*