nfsd4: check backchannel attributes on create_session

Make sure the client gives us an adequate backchannel.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/fs/nfsd/xdr4cb.h b/fs/nfsd/xdr4cb.h
new file mode 100644
index 000000000000..c5c55dfb91a9
--- /dev/null
+++ b/fs/nfsd/xdr4cb.h
@@ -0,0 +1,23 @@
+#define NFS4_MAXTAGLEN          20
+
+#define NFS4_enc_cb_null_sz             0
+#define NFS4_dec_cb_null_sz             0
+#define cb_compound_enc_hdr_sz          4
+#define cb_compound_dec_hdr_sz          (3 + (NFS4_MAXTAGLEN >> 2))
+#define sessionid_sz                    (NFS4_MAX_SESSIONID_LEN >> 2)
+#define cb_sequence_enc_sz              (sessionid_sz + 4 +             \
+                                        1 /* no referring calls list yet */)
+#define cb_sequence_dec_sz              (op_dec_sz + sessionid_sz + 4)
+
+#define op_enc_sz                       1
+#define op_dec_sz                       2
+#define enc_nfs4_fh_sz                  (1 + (NFS4_FHSIZE >> 2))
+#define enc_stateid_sz                  (NFS4_STATEID_SIZE >> 2)
+#define NFS4_enc_cb_recall_sz           (cb_compound_enc_hdr_sz +       \
+                                        cb_sequence_enc_sz +            \
+                                        1 + enc_stateid_sz +            \
+                                        enc_nfs4_fh_sz)
+
+#define NFS4_dec_cb_recall_sz           (cb_compound_dec_hdr_sz  +      \
+                                        cb_sequence_dec_sz +            \
+                                        op_dec_sz)