mainline inclusion
from mainline-5.10-rc1
commit 27a1e8a0
category: bugfix
bugzilla: 51817
CVE: NA

-------------------------------------------------
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: NRoberto Bergantinos Corpas <rbergant@redhat.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
(cherry picked from commit 27a1e8a0)
Signed-off-by: NBaisong Zhong <zhongbaisong@huawei.com>
Reviewed-by: NYue Haibing <yuehaibing@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>