This program opens and "listens" on the new nfsd/clname rpc_pipefs pipe.
The code here doesn't actually do anything on stable storage yet. That
will be added in a later patch.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
configure.ac | 1 +
utils/Makefile.am | 1 +
utils/clstated/Makefile.am | 14 +++
utils/clstated/clstated.c | 243 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 259 insertions(+), 0 deletions(-)
create mode 100644 utils/clstated/Makefile.am
create mode 100644 utils/clstated/clstated.c
diff --git a/configure.ac b/configure.ac
index f101b86..822cf17 100644
--- a/configure.ac
+++ b/configure.ac
@@ -458,6 +458,7 @@ AC_CONFIG_FILES([
tools/nfs-iostat/Makefile
utils/Makefile
utils/blkmapd/Makefile
+ utils/clstated/Makefile
utils/exportfs/Makefile
utils/gssd/Makefile
utils/idmapd/Makefile
diff --git a/utils/Makefile.am b/utils/Makefile.am
index d074b85..beaf4e9 100644
--- a/utils/Makefile.am
+++ b/utils/Makefile.am
@@ -22,6 +22,7 @@ OPTDIRS += mount
endif
SUBDIRS = \
+ clstated \
exportfs \
mountd \
nfsd \
diff --git a/utils/clstated/Makefile.am b/utils/clstated/Makefile.am
new file mode 100644
index 0000000..9937353
--- /dev/null
+++ b/utils/clstated/Makefile.am
@@ -0,0 +1,14 @@
+## Process this file with automake to produce Makefile.in
+
+#man8_MANS = clstated.man
+#EXTRA_DIST = $(man8_MANS)
+
+AM_CFLAGS += -D_LARGEFILE64_SOURCE
+sbin_PROGRAMS = clstated
+
+clstated_SOURCES = clstated.c
+
+clstated_LDADD = ../../support/nfs/libnfs.a $(LIBEVENT)
+
+MAINTAINERCLEANFILES = Makefile.in
+
diff --git a/utils/clstated/clstated.c b/utils/clstated/clstated.c
new file mode 100644
index 0000000..93a2710
--- /dev/null
+++ b/utils/clstated/clstated.c
@@ -0,0 +1,243 @@
+/*
+ * clstated.c -- NFSv4 client state tracking daemon
+ *
+ * Copyright (C) 2011 Red Hat, 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., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <errno.h>
+#include <event.h>
+#include <stdbool.h>
+#include <getopt.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/nfsd/clstate.h>
+
+#include "xlog.h"
+#include "nfslib.h"
+
+#ifndef PIPEFS_DIR
+#define PIPEFS_DIR NFS_STATEDIR "/rpc_pipefs"
+#endif
+
+#define DEFAULT_CLNAMED_PATH PIPEFS_DIR "/nfsd/clstate"
+
+/* private data structures */
+struct clstate_client {
+ int cl_fd;
+ struct event cl_event;
+ struct clstate_msg cl_msg;
+};
+
+/* global variables */
+static char *pipepath = DEFAULT_CLNAMED_PATH;
+
+static struct option longopts[] =
+{
+ { "help", 0, NULL, 'h' },
+ { "foreground", 0, NULL, 'F' },
+ { "debug", 0, NULL, 'd' },
+ { "path", 1, NULL, 'p' },
+ { NULL, 0, 0, 0 },
+};
+
+/* forward declarations */
+static void clstatecb(int UNUSED(fd), short which, void *data);
+
+static void
+usage(char *progname)
+{
+ printf("Usage:\n");
+ printf("%s [ -hFdp ]\n", progname);
+}
+
+static int
+clstate_pipe_open(struct clstate_client *clnt)
+{
+ clnt->cl_fd = open(pipepath, O_RDWR, 0);
+ if (clnt->cl_fd < 0) {
+ xlog(L_ERROR, "%s: unable to open %s: %m", __func__, pipepath);
+ return clnt->cl_fd;
+ }
+
+ event_set(&clnt->cl_event, clnt->cl_fd, EV_READ, clstatecb, clnt);
+ event_add(&clnt->cl_event, NULL);
+
+ return clnt->cl_fd;
+}
+
+static void
+clstate_pipe_reopen(struct clstate_client *clnt)
+{
+ int fd;
+
+ fd = open(pipepath, O_RDWR, 0);
+ if (fd < 0) {
+ xlog_warn("%s: Re-opening of %s failed: %m");
+ return;
+ }
+
+ if ((clnt->cl_event.ev_flags & EVLIST_INIT))
+ event_del(&clnt->cl_event);
+ if (clnt->cl_fd > 0)
+ close(clnt->cl_fd);
+
+ clnt->cl_fd = fd;
+ event_set(&clnt->cl_event, clnt->cl_fd, EV_READ, clstatecb, clnt);
+ /* event_add is done by the caller */
+}
+
+static void
+clstate_create(struct clstate_client *clnt)
+{
+ ssize_t bsize, wsize;
+ struct clstate_msg *cmsg = &clnt->cl_msg;
+
+ xlog(D_GENERAL, "%s: create client record", __func__);
+
+ /* FIXME: create client record on storage here */
+
+ /* set up reply */
+ cmsg->cm_status = 0;
+ cmsg->cm_len = 0;
+ memset(cmsg->cm_addr, 0, sizeof(cmsg->cm_addr) +
+ sizeof(cmsg->cm_u.cm_id));
+
+ bsize = sizeof(*cmsg);
+
+ wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+ if (wsize != bsize) {
+ xlog(L_ERROR, "%s: problem writing to clstate pipe (%ld): %m",
+ __func__, wsize);
+ clstate_pipe_reopen(clnt);
+ }
+}
+
+static void
+clstatecb(int UNUSED(fd), short which, void *data)
+{
+ ssize_t len;
+ struct clstate_client *clnt = data;
+ struct clstate_msg *cmsg = &clnt->cl_msg;
+
+ if (which != EV_READ)
+ goto out;
+
+ len = atomicio(read, clnt->cl_fd, cmsg, sizeof(*cmsg));
+ if (len <= 0) {
+ xlog_warn("%s: pipe read failed: %m", __func__);
+ clstate_pipe_reopen(clnt);
+ goto out;
+ }
+
+ switch(cmsg->cm_cmd) {
+ case Cl_Create:
+ clstate_create(clnt);
+ break;
+ case Cl_Expire:
+ case Cl_NrToReclaim:
+ case Cl_Allow:
+ case Cl_GraceDone:
+ xlog_warn("%s: command %u is not yet implemented", __func__,
+ cmsg->cm_cmd);
+ break;
+ default:
+ xlog_warn("%s: unrecognized command %u", __func__,
+ cmsg->cm_cmd);
+ clstate_pipe_reopen(clnt);
+ }
+out:
+ event_add(&clnt->cl_event, NULL);
+}
+
+int
+main(int argc, char **argv)
+{
+ char arg;
+ int rc = 0, fd;
+ bool foreground = false;
+ char *progname;
+ struct clstate_client clnt;
+
+ memset(&clnt, 0, sizeof(clnt));
+
+ progname = strdup(basename(argv[0]));
+ if (!progname) {
+ fprintf(stderr, "%s: unable to allocate memory.\n", argv[0]);
+ return 1;
+ }
+
+ event_init();
+ xlog_syslog(0);
+ xlog_stderr(1);
+
+ /* process command-line options */
+ while ((arg = getopt_long(argc, argv, "hdFp:", longopts,
+ NULL)) != EOF) {
+ switch (arg) {
+ case 'd':
+ xlog_config(D_ALL, 1);
+ break;
+ case 'F':
+ foreground = true;
+ break;
+ case 'p':
+ pipepath = optarg;
+ break;
+ default:
+ usage(progname);
+ return 0;
+ }
+ }
+
+
+ xlog_open(progname);
+ if (!foreground) {
+ xlog_syslog(1);
+ xlog_stderr(0);
+ rc = daemon(0, 0);
+ if (rc) {
+ xlog(L_ERROR, "Unable to daemonize: %m");
+ goto out;
+ }
+ }
+
+ /* set up storage db */
+
+ /* set up event handler */
+ fd = clstate_pipe_open(&clnt);
+ if (fd < 0) {
+ rc = fd;
+ goto out;
+ }
+
+ rc = event_dispatch();
+ if (rc < 0)
+ xlog(L_ERROR, "%s: event_dispatch failed: %m", __func__);
+
+ close(clnt.cl_fd);
+out:
+ free(progname);
+ return rc;
+}
--
1.7.1
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