SUNRPC: Fix "EPIPE" error on mount of rpcsec_gss-protected partitions

 gss_create_upcall() should not error just because rpc.gssd closed the
 pipe on its end. Instead, it should requeue the pending requests and then
 retry.

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

2 files changed, 6 insertions, 4 deletions

diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index f44f46f1d8e0..8d782282ec19 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -638,7 +638,7 @@ gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
                                 gss_msg);
                 atomic_inc(&gss_msg->count);
                 gss_unhash_msg(gss_msg);
-                if (msg->errno == -ETIMEDOUT || msg->errno == -EPIPE) {
+                if (msg->errno == -ETIMEDOUT) {
                         unsigned long now = jiffies;
                         if (time_after(now, ratelimit)) {
                                 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
@@ -786,7 +786,9 @@ gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int taskflags)
         cred->gc_flags = 0;
         cred->gc_base.cr_ops = &gss_credops;
         cred->gc_service = gss_auth->service;
-        err = gss_create_upcall(gss_auth, cred);
+        do {
+                err = gss_create_upcall(gss_auth, cred);
+        } while (err == -EAGAIN);
         if (err < 0)
                 goto out_err;
 
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index c76ea221798c..16a2458f38f7 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -174,7 +174,7 @@ rpc_pipe_release(struct inode *inode, struct file *filp)
                 goto out;
         msg = (struct rpc_pipe_msg *)filp->private_data;
         if (msg != NULL) {
-                msg->errno = -EPIPE;
+                msg->errno = -EAGAIN;
                 list_del_init(&msg->list);
                 rpci->ops->destroy_msg(msg);
         }
@@ -183,7 +183,7 @@ rpc_pipe_release(struct inode *inode, struct file *filp)
         if (filp->f_mode & FMODE_READ)
                 rpci->nreaders --;
         if (!rpci->nreaders)
-                __rpc_purge_upcall(inode, -EPIPE);
+                __rpc_purge_upcall(inode, -EAGAIN);
         if (rpci->ops->release_pipe)
                 rpci->ops->release_pipe(inode);
 out: