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authorChuck Lever <chuck.lever@oracle.com>2016-03-01 21:06:02 +0300
committerJ. Bruce Fields <bfields@redhat.com>2016-03-02 00:06:35 +0300
commit4500632f60fa0d85e4101c374898cdf9b7b0cfac (patch)
tree108e40fab78bcb843b2a7efa9e6439f8f2d4249b /net/sunrpc/auth_unix.c
parentf6763c29ab86c3ee27760a06e07bbeab47635b61 (diff)
downloadlinux-4500632f60fa0d85e4101c374898cdf9b7b0cfac.tar.xz
nfsd: Lower NFSv4.1 callback message size limit
The maximum size of a backchannel message on RPC-over-RDMA depends on the connection's inline threshold. Today that threshold is typically 1024 bytes, making the maximum message size 996 bytes. The Linux server's CREATE_SESSION operation checks that the size of callback Calls can be as large as 1044 bytes, to accommodate RPCSEC_GSS. Thus CREATE_SESSION fails if a client advertises the true message size maximum of 996 bytes. But the server's backchannel currently does not support RPCSEC_GSS. The actual maximum size it needs is much smaller. It is safe to reduce the limit to enable NFSv4.1 on RDMA backchannel operation. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc/auth_unix.c')
-rw-r--r--net/sunrpc/auth_unix.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
index 548240dd15fc..0d3dd364c22f 100644
--- a/net/sunrpc/auth_unix.c
+++ b/net/sunrpc/auth_unix.c
@@ -23,8 +23,6 @@ struct unx_cred {
};
#define uc_uid uc_base.cr_uid
-#define UNX_WRITESLACK (21 + XDR_QUADLEN(UNX_MAXNODENAME))
-
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif
@@ -228,8 +226,8 @@ const struct rpc_authops authunix_ops = {
static
struct rpc_auth unix_auth = {
- .au_cslack = UNX_WRITESLACK,
- .au_rslack = 2, /* assume AUTH_NULL verf */
+ .au_cslack = UNX_CALLSLACK,
+ .au_rslack = NUL_REPLYSLACK,
.au_ops = &authunix_ops,
.au_flavor = RPC_AUTH_UNIX,
.au_count = ATOMIC_INIT(0),