nfs41: make sure nfs server return right ca_maxresponsesize_cached

According to rfc5661,

  ca_maxresponsesize_cached:

     Like ca_maxresponsesize, but the maximum size of a reply that
     will be stored in the reply cache (Section 2.10.6.1).  For each
     channel, the server MAY decrease this value, but MUST NOT
     increase it.

the latest kernel(2.6.38-rc8) may increase the value for ignoring
request's ca_maxresponsesize_cached value. We should not ignore it.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index c26dc31fb943..a20827804c50 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -608,7 +608,8 @@ static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4
         u32 maxrpc = nfsd_serv->sv_max_mesg;
 
         new->maxreqs = numslots;
-        new->maxresp_cached = slotsize + NFSD_MIN_HDR_SEQ_SZ;
+        new->maxresp_cached = min_t(u32, req->maxresp_cached,
+                                        slotsize + NFSD_MIN_HDR_SEQ_SZ);
         new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
         new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
         new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);