- make HEAD from b_post_cmd3

[fs/lustre-release.git] / lustre / utils / gss / svcgssd_main_loop.c

diff --git a/lustre/utils/gss/svcgssd_main_loop.c b/lustre/utils/gss/svcgssd_main_loop.c
new file mode 100644 (file)
index 0000000..3132829
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+++ b/lustre/utils/gss/svcgssd_main_loop.c
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+/*
+  Copyright (c) 2004 The Regents of the University of Michigan.
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in the
+     documentation and/or other materials provided with the distribution.
+  3. Neither the name of the University nor the names of its
+     contributors may be used to endorse or promote products derived
+     from this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/poll.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <memory.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "svcgssd.h"
+#include "err_util.h"
+
+/*
+ * nfs4 in-kernel cache implementation make upcall failed directly
+ * if there's no listener detected. so here we should keep the init
+ * channel file open as possible as we can.
+ *
+ * unfortunately the proc doesn't support dir change notification.
+ * and when an entry get unlinked, we only got POLLIN event once,
+ * it's the only oppotunity we can close the file and startover.
+ */
+void
+svcgssd_run()
+{
+       int                     ret;
+       FILE                    *f = NULL;
+       struct pollfd           pollfd;
+       struct timespec         halfsec = { .tv_sec = 0, .tv_nsec = 500000000 };
+
+#define NULLRPC_FILE "/proc/net/rpc/auth.ptlrpcs.init/channel"
+
+       while (1) {
+               int save_err;
+
+               while (f == NULL) {
+                       f = fopen(NULLRPC_FILE, "rw");
+                       if (f == NULL) {
+                               printerr(4, "failed to open %s: %s\n",
+                                        NULLRPC_FILE, strerror(errno));
+                               nanosleep(&halfsec, NULL);
+                       } else {
+                               printerr(1, "successfully open %s\n",
+                                        NULLRPC_FILE);
+                               break;
+                       }
+               }
+               pollfd.fd = fileno(f);
+               pollfd.events = POLLIN;
+
+               pollfd.revents = 0;
+               ret = poll(&pollfd, 1, 1000);
+               save_err = errno;
+
+               if (ret < 0) {
+                       printerr(0, "error return from poll: %s\n",
+                                strerror(save_err));
+                       fclose(f);
+                       f = NULL;
+               } else if (ret == 0) {
+                       printerr(3, "poll timeout\n");
+               } else {
+                       if (ret != 1) {
+                               printerr(0, "bug: unexpected poll return %d\n",
+                                               ret);
+                               exit(1);
+                       }
+                       if (pollfd.revents & POLLIN) {
+                               if (handle_nullreq(f) < 0) {
+                                       fclose(f);
+                                       f = NULL;
+                               }
+                       }
+               }
+       }
+}