Commit 27a1e8a0 authored Oct 19, 2020 by Roberto Bergantinos Corpas Committed by J. Bruce Fields Oct 20, 2020

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>

parent c327a310

net/sunrpc/cache.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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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