nfsd: return nfserr_minor_vers_mismatch when compound minorversion != 0

Check minorversion once before decoding any operation and reject with
nfserr_minor_vers_mismatch if != 0 (this still happens in nfsd4_proc_compound).
In this case return a zero length resultdata array as required by RFC3530.

minorversion 1 processing will have its own vector of decoders.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 3 insertions, 7 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 9547ab636274..413a15332177 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1019,6 +1019,9 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
                 }
         }
 
+        if (argp->minorversion != 0)
+                argp->opcnt = 0;
+
         for (i = 0; i < argp->opcnt; i++) {
                 op = &argp->ops[i];
                 op->replay = NULL;
@@ -1057,13 +1060,6 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
                 op->opnum = ntohl(*argp->p++);
 
                 switch (op->opnum) {
-                case 2: /* Reserved operation */
-                        op->opnum = OP_ILLEGAL;
-                        if (argp->minorversion == 0)
-                                op->status = nfserr_op_illegal;
-                        else
-                                op->status = nfserr_minor_vers_mismatch;
-                        break;
                 case OP_ACCESS:
                         op->status = nfsd4_decode_access(argp, &op->u.access);
                         break;