Add a new header that describes the clname tracking daemon upcall. The
daemon takes a versioned binary struct. Hopefully this should allow us
to revise the struct later if it becomes necessary.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
include/linux/nfsd/clstate.h | 59 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 59 insertions(+), 0 deletions(-)
create mode 100644 include/linux/nfsd/clstate.h
diff --git a/include/linux/nfsd/clstate.h b/include/linux/nfsd/clstate.h
new file mode 100644
index 0000000..d571aa5
--- /dev/null
+++ b/include/linux/nfsd/clstate.h
@@ -0,0 +1,59 @@
+/*
+ * fs/nfsd/clstate.h - data type and function declarations for clstate mgmt
+ *
+ * Copyright (c) 2011 Red Hat, Inc.
+ * Author(s): Jeff Layton <jlayton@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _NFSD_CLSTATE_H
+#define _NFSD_CLSTATE_H
+
+/* latest upcall version available */
+#define CLSTATE_MAX_UPCALL_VERSION 1
+
+/* defined by RFC3530 */
+#define NFS4_OPAQUE_LIMIT 1024
+
+/*
+ * Maximum length of an address string. We could use INET6_ADDRSTRLEN, but
+ * the kernel and userspace definitions are different.
+ */
+#define CLSTATE_MAX_ADDRESS_LEN 48
+
+enum clstate_command {
+ Cl_Create, /* create a record for this cm_id */
+ Cl_Expire, /* remove record for this cm_id */
+ Cl_NrToReclaim, /* how many client records need reclaim? */
+ Cl_Allow, /* is this cm_id allowed? */
+ Cl_GraceDone /* grace period is complete */
+};
+
+/* message struct for communication with userspace */
+struct clstate_msg {
+ uint8_t cm_vers; /* upcall version */
+ uint8_t cm_cmd; /* upcall command */
+ uint32_t cm_xid; /* transaction id */
+ int16_t cm_status; /* return code */
+ uint16_t cm_len; /* length of cm_id */
+ unsigned char cm_addr[CLSTATE_MAX_ADDRESS_LEN]; /* server addr */
+ union {
+ int64_t cm_gracetime; /* grace period start time */
+ unsigned char cm_id[NFS4_OPAQUE_LIMIT]; /* client-provided */
+ } __attribute__((packed)) cm_u;
+} __attribute__((packed));
+
+#endif /* !_NFSD_CLSTATE_H */
--
1.7.1
--
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