From 27a1e8a0f79e643d4dedb46f71e76bdee3801877 Mon Sep 17 00:00:00 2001
From: Roberto Bergantinos Corpas <rbergant@redhat.com>
Date: Mon, 19 Oct 2020 11:33:56 +0200
Subject: sunrpc: raise kernel RPC channel buffer size

Its possible that using AUTH_SYS and mountd manage-gids option a
user may hit the 8k RPC channel buffer limit. This have been observed
on field, causing unanswered RPCs on clients after mountd fails to
write on channel :

rpc.mountd[11231]: auth_unix_gid: error writing reply

Userland nfs-utils uses a buffer size of 32k (RPC_CHAN_BUF_SIZE), so
lets match those two.

Signed-off-by: Roberto Bergantinos Corpas <rbergant@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
 net/sunrpc/cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'net')

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 2990a7ab9e2a..20c93b68505e 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -909,7 +909,7 @@ static ssize_t cache_do_downcall(char *kaddr, const char __user *buf,
 static ssize_t cache_slow_downcall(const char __user *buf,
 				   size_t count, struct cache_detail *cd)
 {
-	static char write_buf[8192]; /* protected by queue_io_mutex */
+	static char write_buf[32768]; /* protected by queue_io_mutex */
 	ssize_t ret = -EINVAL;
 
 	if (count >= sizeof(write_buf))
-- 
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