nfsd41: implement NFS4_SHARE_WANT_NO_DELEG, NFS4_OPEN_DELEGATE_NONE_EXT, why_no_deleg

Respect client request for not getting a delegation in NFSv4.1
Appropriately return delegation "type" NFS4_OPEN_DELEGATE_NONE_EXT
and WND4_NOT_WANTED reason.

[nfsd41: add missing break when encoding op_why_no_deleg]
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index a58f2064f479..f8fcddca0414 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2849,6 +2849,20 @@ nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_op
                 WRITE32(0);   /* XXX: is NULL principal ok? */
                 ADJUST_ARGS();
                 break;
+        case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
+                switch (open->op_why_no_deleg) {
+                case WND4_CONTENTION:
+                case WND4_RESOURCE:
+                        RESERVE_SPACE(8);
+                        WRITE32(open->op_why_no_deleg);
+                        WRITE32(0);     /* deleg signaling not supported yet */
+                        break;
+                default:
+                        RESERVE_SPACE(4);
+                        WRITE32(open->op_why_no_deleg);
+                }
+                ADJUST_ARGS();
+                break;
         default:
                 BUG();
         }