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>
diff --git a/fs/nfsd/xdr4cb.h b/fs/nfsd/xdr4cb.h
new file mode 100644
index 0000000..c5c55df
--- /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)