[LTP PATCH 3/4] posix mqns: test vfs and mq interaction

[Serge E. Hallyn]

Test that the interaction between mqueuefs and ipc namespaces
is correct (one mqueuefs for each ipc namespace, living at least
as long as the namespace)

Signed-off-by: Serge Hallyn <serue@xxxxxxxxxx>
---
 testcases/kernel/containers/mqns/mqns.h         |    1 +
 testcases/kernel/containers/mqns/mqns_03.c      |  196 +++++++++++++++++++++++
 testcases/kernel/containers/mqns/runmqnstest.sh |    2 +-
 3 files changed, 198 insertions(+), 1 deletions(-)
 create mode 100644 testcases/kernel/containers/mqns/mqns_03.c

diff --git a/testcases/kernel/containers/mqns/mqns.h b/testcases/kernel/containers/mqns/mqns.h
index df8fc4b..4bf1e1f 100644
--- a/testcases/kernel/containers/mqns/mqns.h
+++ b/testcases/kernel/containers/mqns/mqns.h
@@ -9,5 +9,6 @@
 
 #define DEV_MQUEUE "/dev/mqueue"
 #define SLASH_MQ1 "/MQ1"
+#define SLASH_MQ2 "/MQ2"
 
 #endif /* __MQNS_H */
diff --git a/testcases/kernel/containers/mqns/mqns_03.c b/testcases/kernel/containers/mqns/mqns_03.c
new file mode 100644
index 0000000..732bf88
--- /dev/null
+++ b/testcases/kernel/containers/mqns/mqns_03.c
@@ -0,0 +1,196 @@
+/*
+* Copyright (c) International Business Machines Corp., 2007
+* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*
+* Author: Serge Hallyn <serue@xxxxxxxxxx>
+*
+* Check ipcns+sb longevity
+*
+* Mount mqueue fs
+* unshare
+* In unshared process:
+*    Create "/mq1" with mq_open()
+*    Mount mqueuefs
+*    Check that /mq1 exists
+*    Create /dev/mqueue/mq2 through vfs (create(2))
+*    Umount /dev/mqueue
+*    Remount /dev/mqueue
+*    Check that both /mq1 and /mq2 exist
+
+***************************************************************************/
+
+#define _GNU_SOURCE 1
+#include <sys/wait.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include "mqns.h"
+
+char *TCID = "posixmq_namespace_03";
+int TST_TOTAL=1;
+
+int p1[2];
+int p2[2];
+
+#define FNAM1 DEV_MQUEUE2 SLASH_MQ1
+#define FNAM2 DEV_MQUEUE2 SLASH_MQ2
+
+int check_mqueue(void *vtest)
+{
+	char buf[30];
+	mqd_t mqd;
+	int rc;
+	struct stat statbuf;
+
+	close(p1[1]);
+	close(p2[0]);
+
+	read(p1[0], buf, 3); /* go */
+
+	mqd = mq_open(SLASH_MQ1, O_RDWR|O_CREAT|O_EXCL, 0755, NULL);
+	if (mqd == -1) {
+		write(p2[1], "mqfail", 7);
+		tst_exit(3);
+	}
+
+	mq_close(mqd);
+
+	rc = mount("mqueue", DEV_MQUEUE2, "mqueue", 0, NULL);
+	if (rc == -1) {
+		perror("mount");
+		write(p2[1], "mount1", 7);
+		tst_exit(3);
+	}
+
+	rc = stat(FNAM1, &statbuf);
+	if (rc == -1) {
+		write(p2[1], "stat1", 6);
+		tst_exit(3);
+	}
+
+	rc = creat(FNAM2, 0755);
+	if (rc == -1) {
+		write(p2[1], "creat", 6);
+		tst_exit(3);
+	}
+
+	close(rc);
+
+	rc = umount(DEV_MQUEUE2);
+	if (rc == -1) {
+		perror("umount");
+		write(p2[1], "umount", 7);
+		tst_exit(3);
+	}
+
+	rc = mount("mqueue", DEV_MQUEUE2, "mqueue", 0, NULL);
+	if (rc == -1) {
+		write(p2[1], "mount2", 7);
+		tst_exit(3);
+	}
+
+	rc = stat(FNAM1, &statbuf);
+	if (rc == -1) {
+		write(p2[1], "stat2", 7);
+		tst_exit(3);
+	}
+
+	rc = stat(FNAM2, &statbuf);
+	if (rc == -1) {
+		write(p2[1], "stat3", 7);
+		tst_exit(3);
+	}
+
+	write(p2[1], "done", 5);
+
+	tst_exit(0);
+
+	/* NOT REACHED */
+	return 0;
+}
+
+
+int main(int argc, char *argv[])
+{
+	int r;
+	char buf[7];
+	int use_clone = T_UNSHARE;
+
+	if (argc == 2 && strcmp(argv[1], "-clone") == 0) {
+		tst_resm(TINFO, "Testing posix mq namespaces through clone(2).\n");
+		use_clone = T_CLONE;
+	} else
+		tst_resm(TINFO, "Testing posix mq namespaces through unshare(2).\n");
+ 
+	if (pipe(p1) == -1) { perror("pipe"); exit(EXIT_FAILURE); }
+	if (pipe(p2) == -1) { perror("pipe"); exit(EXIT_FAILURE); }
+
+	/* fire off the test */
+	r = do_clone_unshare_test(use_clone, CLONE_NEWIPC, check_mqueue, NULL);
+	if (r < 0) {
+		tst_resm(TFAIL, "failed clone/unshare\n");
+		tst_exit(1);
+	}
+
+	tst_resm(TINFO, "Checking correct umount+remount of mqueuefs\n");
+
+	mkdir(DEV_MQUEUE2, 0755);
+
+ 	close(p1[0]);
+	close(p1[0]);
+	close(p2[1]);
+	write(p1[1], "go", 3);
+
+	read(p2[0], buf, 7);
+	r = TFAIL;
+	if (!strcmp(buf, "mqfail")) {
+		tst_resm(TFAIL, "child process could not create mqueue\n");
+		goto fail;
+	} else if (!strcmp(buf, "mount1")) {
+		tst_resm(TFAIL, "child process could not mount mqueue\n");
+		goto fail;
+	} else if (!strcmp(buf, "stat1x")) {
+		tst_resm(TFAIL, "mq created by child is not in mqueuefs\n");
+		goto fail;
+	} else if (!strcmp(buf, "creat")) {
+		tst_resm(TFAIL, "child couldn't creat mq through mqueuefs\n");
+		goto fail;
+	} else if (!strcmp(buf, "umount")) {
+		tst_resm(TFAIL, "child couldn't umount mqueuefs\n");
+		goto fail;
+	} else if (!strcmp(buf, "mount2")) {
+		tst_resm(TFAIL, "child couldn't remount mqueuefs\n");
+		goto fail;
+	} else if (!strcmp(buf, "stat2")) {
+		tst_resm(TFAIL, "mq_open()d file gone after remount of mqueuefs\n");
+		goto fail;
+	} else if (!strcmp(buf, "stat3")) {
+		tst_resm(TFAIL, "creat(2)'d file gone after remount of mqueuefs\n");
+		goto fail;
+	}
+
+	tst_resm(TPASS, "umount+remount of mqueuefs remounted the right fs\n");
+
+	r = 0;
+fail:
+	umount(DEV_MQUEUE2);
+	rmdir(DEV_MQUEUE2);
+	tst_exit(r);
+
+	/* NOT REACHED */
+	return 0;
+}
diff --git a/testcases/kernel/containers/mqns/runmqnstest.sh b/testcases/kernel/containers/mqns/runmqnstest.sh
index a5bbd24..b518d28 100755
--- a/testcases/kernel/containers/mqns/runmqnstest.sh
+++ b/testcases/kernel/containers/mqns/runmqnstest.sh
@@ -20,7 +20,7 @@
 ################################################################################
 
 exit_code=0
-tests_list='mqns_01 mqns_02'
+tests_list='mqns_01 mqns_02 mqns_03'
 
 for t in $tests_list
 do
-- 
1.6.0.5

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