[LTP] [PATCH v1] Test statx() with flag AT_NO_AUTOMOUNT.

[Cyril Hrubis]

Hi!
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -1504,3 +1504,4 @@ statx02 statx02
>  statx03 statx03
>  statx04 statx04
>  statx05 statx05
> +statx11 statx11
> \ No newline at end of file

Can you please make sure that your patches include newlines at the end
of the files?

If these are missing adding lines at the end of the file produces ugly
patches...

> diff --git a/testcases/kernel/syscalls/statx/.gitignore b/testcases/kernel/syscalls/statx/.gitignore
> index 209fc3a33..606fb1a59 100644
> --- a/testcases/kernel/syscalls/statx/.gitignore
> +++ b/testcases/kernel/syscalls/statx/.gitignore
> @@ -3,3 +3,4 @@
>  /statx03
>  /statx04
>  /statx05
> +/statx11
> diff --git a/testcases/kernel/syscalls/statx/statx11.c b/testcases/kernel/syscalls/statx/statx11.c
> new file mode 100644
> index 000000000..62b4e7b48
> --- /dev/null
> +++ b/testcases/kernel/syscalls/statx/statx11.c
> @@ -0,0 +1,194 @@
> +// SPDX-License-Identifier: GPL-2.0 or later
> +/*
> + *  Copyright (c) Zilogic Systems Pvt. Ltd., 2018
> + *  Email : code@zilogic.com
> + */
> +
> +/*
> + * Testcase for statx syscall with AT_NO_AUTOMOUNT flag
> + *
> + * --Test Logic--
> + * Configure a mount point for autofs.
> + *
> + * Spawn a new child process.
> + *
> + * statx() is invoked within the child process-
> + *   With AT_NO_AUTOMOUNT flag- Child won't send any autofs notification
> + *                              message to parent.
> + *   Without AT_NO_AUTOMOUNT flag- Child will send autofs notification
> + *                                 message to parent, that can be read via pipe.
> + *
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <sys/time.h>
> +#include <sys/eventfd.h>
> +#include <stdbool.h>
> +
> +#include "tst_test.h"
> +#include "lapi/stat.h"
> +
> +#define MNTPOINT "mntpoint"
> +
> +static int autofs_fds[2] = {-1};
> +static int ev_fd = -1;
> +static int mounted;
> +static int pipe_created;
> +static int mnt_dir_created;
> +static int ev_fd_created;
> +
> +static bool check_autofs_notification_msg(int autofs_read_fd, int ev_fd)
> +{
> +	int retval;
> +	int max_fd;
> +	fd_set rfds;
> +	u_int64_t statx_status;
> +	struct timeval tv;
> +	bool notification_msg_status;
> +
> +	max_fd = (autofs_read_fd > ev_fd) ? autofs_read_fd : ev_fd;
> +
> +	FD_ZERO(&rfds);
> +	FD_SET(autofs_read_fd, &rfds);
> +	FD_SET(ev_fd, &rfds);
> +
> +	tv.tv_sec = 5;
> +	tv.tv_usec = 0;
> +
> +	retval = select((max_fd + 1), &rfds, NULL, NULL, &tv);
> +	if (retval == -1)
> +		tst_brk(TBROK | TERRNO, "select() failed");
> +
> +	if (FD_ISSET(autofs_read_fd, &rfds))
> +		notification_msg_status = true;
> +	else
> +		notification_msg_status = false;
> +
> +	if (FD_ISSET(ev_fd, &rfds)) {
> +		SAFE_READ(0, ev_fd, &statx_status, sizeof(statx_status));
> +		if (statx_status == 1)
> +			tst_brk(TBROK, "statx() failed");
> +		else if (statx_status == 2)
> +			tst_res(TINFO, "statx() passed");
> +	}
> +
> +	return notification_msg_status;
> +}
> +
> +void autofs_mount(int fd)
> +{
> +	char mnt_options[64];
> +
> +	SAFE_MKDIR(MNTPOINT, 0666);
> +	mnt_dir_created = 1;
> +
> +	snprintf(mnt_options, sizeof(mnt_options),
> +		 "fd=%i,minproto=5,maxproto=5,direct", fd);
> +
> +	SAFE_MOUNT("ltp_test", MNTPOINT, "autofs", 0, mnt_options);
> +	mounted = 1;
> +}
> +
> +static void autofs_run_test(bool automount)
> +{
> +	pid_t pid;
> +	bool mnt_status;
> +	u_int64_t value;
> +	struct statx file_info;
> +
> +	pid = SAFE_FORK();
> +	if (!pid) {
> +		setpgrp();

Why do you do this?

> +		TEST(statx(AT_FDCWD, MNTPOINT,
> +			   (automount) ? 0 : AT_NO_AUTOMOUNT,
> +			   0, &file_info)
> +		     );
> +
> +		if (TST_RET == -1) {
> +			/* 1 -> statx() fail*/
> +			value = 1;
> +			SAFE_WRITE(1, ev_fd, &value, sizeof(value));
> +
> +			exit(1);
> +		}
> +
> +		/* 2 -> statx() pass*/
> +		value = 2;
> +		SAFE_WRITE(1, ev_fd, &value, sizeof(value));

There is no need to propagate anything from the child process, if you
call tst_res(TPASS, ...) in the child process the result will be
propagated automatically to the parent. So there is no need for the
eventfd at all.

> +		exit(0);
> +	}
> +
> +	mnt_status = check_autofs_notification_msg(autofs_fds[0], ev_fd);
> +	if (automount == mnt_status)
> +		tst_res(TPASS, "Mount Status: %d Expected Status: %d",
> +			mnt_status, automount);
> +	else
> +		tst_brk(TFAIL, "Mount Status: %d Expected Status: %d",
> +			mnt_status, automount);
> +
> +	SAFE_KILL(pid, SIGKILL);
> +	SAFE_WAITPID(pid, NULL, 0);
> +}
> +
> +static void setup(void)
> +{
> +	/*
> +	 * Need for eventfd()-
> +	 * To make the parent process aware that statx() has
> +	 * passed/failed in the child process.
> +	 */
> +	ev_fd = eventfd(0, O_NONBLOCK);
> +	if (ev_fd == -1)
> +		tst_brk(TBROK | TERRNO, "eventfd() failed");
> +	ev_fd_created = 1;
> +
> +	SAFE_PIPE(autofs_fds);
> +	pipe_created = 1;
> +
> +	autofs_mount(autofs_fds[1]);
> +}
> +
> +static void cleanup(void)
> +{
> +	if (mounted)
> +		SAFE_UMOUNT(MNTPOINT);
> +
> +	if (mnt_dir_created)
> +		SAFE_RMDIR(MNTPOINT);
> +
> +	if (ev_fd_created)
> +		SAFE_CLOSE(ev_fd);
> +
> +	if (pipe_created) {
> +		SAFE_CLOSE(autofs_fds[0]);
> +		SAFE_CLOSE(autofs_fds[1]);
> +	}
> +}
> +
> +const struct {
> +	bool automount;
> +} tests[] = { {false},
> +	      {true} };

There is absolutely no need for this, you can just do !!tst_nr to get
bool from the test number instead...

> +static void test_controller(unsigned int tst_nr)
> +{
> +	bool automount = tests[tst_nr].automount;
> +
> +	tst_res(TINFO, "statx(AT_FDCWD, %s, %s, 0, &file_info)",
> +		MNTPOINT, (automount) ? "0" : "AT_NO_AUTOMOUNT");
> +
> +	autofs_run_test(automount);
> +}
> +
> +static struct tst_test test = {
> +	.tcnt = ARRAY_SIZE(tests),
> +	.test = test_controller,
> +	.needs_tmpdir = 1,
> +	.forks_child = 1,
> +	.needs_root = 1,
> +	.setup = setup,
> +	.cleanup = cleanup,
> +};
> -- 
> 2.17.1
> 
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
Cyril Hrubis
chrubis@suse.cz