NFS: use scope from exchange_id to skip reclaim

can be skipped if the "eir_server_scope" from the exchange_id proc differs from
previous calls.

Also, in the future server_scope will be useful for determining whether client
trunking is available

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index e6e8f3b9a1de..1555c74dd336 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4977,11 +4977,17 @@ static int decode_exchange_id(struct xdr_stream *xdr,
         if (unlikely(status))
                 return status;
 
-        /* Throw away server_scope */
+        /* Save server_scope */
         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
         if (unlikely(status))
                 return status;
 
+        if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
+                return -EIO;
+
+        memcpy(res->server_scope->server_scope, dummy_str, dummy);
+        res->server_scope->server_scope_sz = dummy;
+
         /* Throw away Implementation id array */
         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
         if (unlikely(status))