test: Add inotify02

Its only purpose if to verify that we can show up
a huge number of inotify in fdoutput (before
the kernel v3.18-rc1-7-ga3816ab we can show
only handles which fit page size in summary).

In particular we revealed that hald daemon makes
up to 35 notification marks which kernel can't
show up in a one pass and dump fails.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -100,6 +100,7 @@ generate_test_list()
 		static/eventfs00
 		static/signalfd00
 		static/inotify00
+		static/inotify02
 		static/inotify_irmap
 		static/fanotify00
 		static/unbound_sock

test/zdtm/live/static/inotify02.c

@@ -0,0 +1,101 @@
+#define _GNU_SOURCE
+
+#include <unistd.h>
+#include <limits.h>
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/inotify.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <signal.h>
+#include <sched.h>
+#include <sys/mount.h>
+#include <sys/prctl.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check for inotify file-handles storm";
+const char *test_author	= "Cyrill Gorcunov <gorcunov@openvz.org>";
+
+char *dirname;
+TEST_OPTION(dirname, string, "directory name", 1);
+
+static int num_of_handles(int fd)
+{
+	char path[64];
+	char buf[512];
+	int ret = 0;
+	FILE *f;
+
+	snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
+	f = fopen(path, "r");
+	if (!f) {
+		err("Can't open %s", path);
+		return -1;
+	}
+
+	while (fgets(buf, sizeof(buf), f)) {
+		if (memcmp(buf, "inotify ", 8))
+			continue;
+		ret++;
+	}
+
+	fclose(f);
+	return ret;
+}
+
+int main (int argc, char *argv[])
+{
+	const unsigned int mask = IN_DELETE | IN_CLOSE_WRITE | IN_DELETE_SELF | IN_CREATE;
+	const int nr_dirs = 64;
+	char temp[nr_dirs][16];
+	char path[PATH_MAX];
+	int fd, i;
+
+	test_init(argc, argv);
+
+	if (mkdir(dirname, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH)) {
+		err("Can't create directory %s", dirname);
+		exit(1);
+	}
+
+	fd = inotify_init1(IN_NONBLOCK);
+	if (fd < 0) {
+		err("inotify_init failed");
+		exit(1);
+	}
+
+	for (i = 0; i < nr_dirs; i++) {
+		snprintf(temp[i], sizeof(temp[0]), "d.%03d", i);
+		snprintf(path, sizeof(path), "%s/%s", dirname, temp[i]);
+		if (mkdir(path, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH)) {
+			err("Can't create %s", path);
+			exit(1);
+		}
+
+		if (inotify_add_watch(fd, path, mask) < 0) {
+			err("inotify_add_watch failed on %s", path);
+			exit(1);
+		}
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	i = num_of_handles(fd);
+	close(fd);
+
+	if (i < nr_dirs)
+		fail("Expected %d handles but got %d", nr_dirs, i);
+	else
+		pass();
+
+	return 0;
+}

test/zdtm/live/static/inotify02.desc

@@ -0,0 +1 @@
+{'flags': 'noauto'}