nfs41: decode minorversion 1 cb_compound header

decode cb_compound header conforming to
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26

Get rid of cb_compound_hdr_arg.callback_ident

callback_ident is not used anywhere so we shouldn't waste any memory to
store it.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: no need to break read_buf in decode_compound_hdr_arg]
See http://linux-nfs.org/pipermail/pnfs/2009-June/007844.html
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index 91f6f74ffea7..f6cc79b1d1f3 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -147,14 +147,15 @@ static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound
         if (unlikely(p == NULL))
                 return htonl(NFS4ERR_RESOURCE);
         hdr->minorversion = ntohl(*p++);
-        /* Check minor version is zero. */
-        if (hdr->minorversion != 0) {
+        /* Check minor version is zero or one. */
+        if (hdr->minorversion <= 1) {
+                p++;    /* skip callback_ident */
+        } else {
                 printk(KERN_WARNING "%s: NFSv4 server callback with "
                         "illegal minor version %u!\n",
                         __func__, hdr->minorversion);
                 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
         }
-        hdr->callback_ident = ntohl(*p++);
         hdr->nops = ntohl(*p);
         dprintk("%s: minorversion %d nops %d\n", __func__,
                 hdr->minorversion, hdr->nops);