NFSv4.1: RECLAIM_COMPLETE must handle EACCES

commit e35a5e7 upstream.

A client should be able to handle getting an EACCES error while doing
a mount operation to reclaim state due to NFS4CLNT_RECLAIM_REBOOT
being set. If the server returns RPC_AUTH_BADCRED because authentication
failed when we execute "exportfs -au", then RECLAIM_COMPLETE will go a
wrong way. After mount succeeds, all OPEN call will fail due to an
NFS4ERR_GRACE error being returned. This patch is to fix it by resending
a RPC request.

Signed-off-by: Zhang Xianwei <[email protected]>
Signed-off-by: Yi Wang <[email protected]>
Fixes: aa5190d ("NFSv4: Kill nfs4_async_handle_error() abuses by NFSv4.1")
Signed-off-by: Trond Myklebust <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: zhangxianwei8

fs/nfs/nfs4proc.c

@@ -9408,6 +9408,9 @@ static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nf
 		rpc_delay(task, NFS4_POLL_RETRY_MAX);
 		fallthrough;
 	case -NFS4ERR_RETRY_UNCACHED_REP:
+	case -EACCES:
+		dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
+			__func__, task->tk_status, clp->cl_hostname);
 		return -EAGAIN;
 	case -NFS4ERR_BADSESSION:
 	case -NFS4ERR_DEADSESSION: