autofs/autofs-5.0.1-random-selection.patch

--- autofs-5.0.1/include/replicated.h.random-selection	2007-03-16 16:27:36.000000000 +0900
+++ autofs-5.0.1/include/replicated.h	2007-03-16 16:27:54.000000000 +0900
@@ -60,6 +60,7 @@ struct host {
 	struct host *next;
 };
 
+void seed_random(void);
 void free_host_list(struct host **);
 int parse_location(struct host **, const char *);
 int prune_host_list(struct host **, unsigned int, const char *);
--- autofs-5.0.1/modules/replicated.c.random-selection	2007-03-16 16:27:36.000000000 +0900
+++ autofs-5.0.1/modules/replicated.c	2007-03-16 16:27:54.000000000 +0900
@@ -74,6 +74,29 @@
 #define max(x, y)	(x >= y ? x : y)
 #define mmax(x, y, z)	(max(x, y) == x ? max(x, z) : max(y, z))
 
+extern unsigned int random_selection;
+
+void seed_random(void)
+{
+	int fd;
+	unsigned int seed;
+
+	fd = open("/dev/random", O_RDONLY);
+	if (fd < 0) {
+		srandom(time(NULL));
+		return;
+	}
+
+	if (read(fd, &seed, sizeof(seed)) != -1)
+		srandom(seed);
+	else
+		srandom(time(NULL));
+
+	close(fd);
+
+	return;
+}
+
 static unsigned int get_proximity(const char *host_addr, int addr_len)
 {
 	struct sockaddr_in *msk_addr, *if_addr;
@@ -403,7 +426,11 @@ static unsigned int get_nfs_info(struct 
 		status = rpc_ping_proto(rpc_info);
 		gettimeofday(&end, &tz);
 		if (status) {
-			taken += elapsed(start, end);
+			if (random_selection)
+				/* Random value between 0 and 1 */
+				taken += ((float) random())/((float) RAND_MAX+1);
+			else
+				taken += elapsed(start, end);;
 			count++;
 			supported = NFS4_SUPPORTED;
 		}
@@ -440,7 +467,11 @@ v3_ver:
 		status = rpc_ping_proto(rpc_info);
 		gettimeofday(&end, &tz);
 		if (status) {
-			taken += elapsed(start, end);
+			if (random_selection)
+				/* Random value between 0 and 1 */
+				taken += ((float) random())/((float) RAND_MAX+1);
+			else
+				taken += elapsed(start, end);;
 			count++;
 			supported |= NFS3_SUPPORTED;
 		}
@@ -470,7 +501,11 @@ v2_ver:
 		status = rpc_ping_proto(rpc_info);
 		gettimeofday(&end, &tz);
 		if (status) {
-			taken += elapsed(start, end);
+			if (random_selection)
+				/* Random value between 0 and 1 */
+				taken += ((float) random())/((float) RAND_MAX+1);
+			else
+				taken += elapsed(start, end);;
 			count++;
 			supported |= NFS2_SUPPORTED;
 		}
@@ -610,8 +645,13 @@ static int get_supported_ver_and_cost(st
 		gettimeofday(&start, &tz);
 		status = rpc_ping_proto(&rpc_info);
 		gettimeofday(&end, &tz);
-		if (status)
-			taken = elapsed(start, end);
+		if (status) {
+			if (random_selection)
+				/* Random value between 0 and 1 */
+				taken = ((float) random())/((float) RAND_MAX+1);
+			else
+				taken = elapsed(start, end);
+		}
 	}
 done:
 	if (rpc_info.proto->p_proto == IPPROTO_UDP) {
--- autofs-5.0.1/modules/mount_nfs.c.random-selection	2007-03-16 16:27:36.000000000 +0900
+++ autofs-5.0.1/modules/mount_nfs.c	2007-03-16 16:27:54.000000000 +0900
@@ -51,6 +51,8 @@ int mount_init(void **context)
 	} else
 		init_ctr++;
 
+	seed_random();
+
 	return !mount_bind;
 }
 
--- autofs-5.0.1/daemon/automount.c.random-selection	2007-03-16 16:27:36.000000000 +0900
+++ autofs-5.0.1/daemon/automount.c	2007-03-16 16:27:54.000000000 +0900
@@ -48,6 +48,8 @@ const char *mapdir = AUTOFS_MAP_DIR;	/* 
 const char *confdir = AUTOFS_CONF_DIR;	/* Location of autofs config file */
 
 static char *pid_file = NULL;	/* File in which to keep pid */
+unsigned int random_selection;	/* use random policy when selecting
+				 * which multi-mount host to mount */
 static int start_pipefd[2];
 static int st_stat = 0;
 static int *pst_stat = &st_stat;
@@ -1363,6 +1365,8 @@ static void usage(void)
 		"	-d --debug	log debuging info\n"
 		"	-D --define	define global macro variable\n"
 		/*"	-f --foreground do not fork into background\n" */
+		"	-r --random-replicated-selection"
+		"			use ramdom replicated server selection\n"
 		"	-V --version	print version, build config and exit\n"
 		, program);
 }
@@ -1461,6 +1465,7 @@ int main(int argc, char *argv[])
 		{"debug", 0, 0, 'd'},
 		{"define", 1, 0, 'D'},
 		{"foreground", 0, 0, 'f'},
+		{"random-selection", 0, 0, 'r'},
 		{"version", 0, 0, 'V'},
 		{0, 0, 0, 0}
 	};
@@ -1476,10 +1481,11 @@ int main(int argc, char *argv[])
 	timeout = defaults_get_timeout();
 	ghost = defaults_get_browse_mode();
 	logging = defaults_get_logging();
+	random_selection = 0;
 	foreground = 0;
 
 	opterr = 0;
-	while ((opt = getopt_long(argc, argv, "+hp:t:vdD:fV", long_options, NULL)) != EOF) {
+	while ((opt = getopt_long(argc, argv, "+hp:t:vdD:fVr", long_options, NULL)) != EOF) {
 		switch (opt) {
 		case 'h':
 			usage();
@@ -1513,6 +1519,10 @@ int main(int argc, char *argv[])
 			show_build_info();
 			exit(0);
 
+		case 'r':
+			random_selection = 1;
+			break;
+
 		case '?':
 		case ':':
 			printf("%s: Ambiguous or unknown options\n", program);
--- autofs-5.0.1/man/automount.8.in.random-selection	2007-03-16 16:27:36.000000000 +0900
+++ autofs-5.0.1/man/automount.8.in	2007-03-16 16:27:54.000000000 +0900
@@ -49,6 +49,10 @@ Define a global macro substitution varia
 are over-ridden macro definitions of the same name specified in
 mount entries.
 .TP
+.I "\-r, \-\-random-replicated-selection"
+Enables the use of ramdom selection when choosing a host from a
+list of replicated servers.
+.TP
 .I "\-V, \-\-version"
 Display the version number, then exit.
 .SH ARGUMENTS