From 04047a9b534e9d3545d02afd674b230f4a2d459d Mon Sep 17 00:00:00 2001
From: Casey Bodley <cbodley@citi.umich.edu>
Date: Tue, 12 Oct 2010 09:54:16 -0400
Subject: [PATCH] handling NFS4ERR_OPENMODE on read

if read fails with NFS4ERR_OPENMODE, retry th read with a special stateid.
---
 daemon/readwrite.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/daemon/readwrite.c b/daemon/readwrite.c
index 9b520cb..71cad66 100644
--- a/daemon/readwrite.c
+++ b/daemon/readwrite.c
@@ -30,6 +30,8 @@
 #include "daemon_debug.h"
 #include "util.h"
 
+stateid4 special_read_stateid = {0xffffffff, 
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}};
 
 int parse_rw(unsigned char *buffer, uint32_t length, nfs41_upcall *upcall)
 {
@@ -81,10 +83,14 @@ static int read_from_mds(
 
         status = nfs41_read(session, file, stateid,
             offset + reloffset, chunk, p, &bytes_read, &eof);
-        if (status && !len) {
+        if (status == NFS4ERR_OPENMODE && !len) {
+            stateid = &special_read_stateid;
+            continue;
+        } else if (status && !len) {
             status = nfs_to_windows_error(status, ERROR_NET_WRITE_FAULT);
             goto out;
         }
+
         p += bytes_read;
         to_rcv -= bytes_read;
         len += bytes_read;