diff mbox series

[v2,1/5] Add stat04 test

Message ID 20240709-stat04-v2-1-2693a473a2ab@suse.com
State Accepted
Headers show
Series symlink01 split | expand

Commit Message

Andrea Cervesato July 9, 2024, 10:45 a.m. UTC
From: Andrea Cervesato <andrea.cervesato@suse.com>

This test has been extracted from symlink01 test and it checks that
stat() executed on file provide the same information of symlink linking
to it.

Reviewed-by: Li Wang <liwang@redhat.com>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/smoketest                         |   4 +-
 runtest/syscalls                          |   4 +-
 testcases/kernel/syscalls/stat/.gitignore |   2 +
 testcases/kernel/syscalls/stat/stat04.c   | 120 ++++++++++++++++++++++++++++++
 4 files changed, 126 insertions(+), 4 deletions(-)

Comments

Petr Vorel July 9, 2024, 9:13 p.m. UTC | #1
Hi all,

> From: Andrea Cervesato <andrea.cervesato@suse.com>

> This test has been extracted from symlink01 test and it checks that
> stat() executed on file provide the same information of symlink linking
> to it.

> Reviewed-by: Li Wang <liwang@redhat.com>
> Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
> ---
>  runtest/smoketest                         |   4 +-
>  runtest/syscalls                          |   4 +-
>  testcases/kernel/syscalls/stat/.gitignore |   2 +
>  testcases/kernel/syscalls/stat/stat04.c   | 120 ++++++++++++++++++++++++++++++
>  4 files changed, 126 insertions(+), 4 deletions(-)

> diff --git a/runtest/smoketest b/runtest/smoketest
> index f6f14fd2b..5608417f9 100644
> --- a/runtest/smoketest
> +++ b/runtest/smoketest
> @@ -8,8 +8,8 @@ time01 time01
>  wait02 wait02
>  write01 write01
>  symlink01 symlink01
> -stat04 symlink01 -T stat04
> -utime07 utime07
> +stat04 stat04
> +utime01A symlink01 -T utime01
nit: Why replace utime07 with utime01? I suggest to merge without this change
(modify only stat04).

Original test also tested ENOENT and ELOOP, but we have this in stat03.c.
(you probably have been discussing this previously.)

@Cyril: will you add your RBT (you reviewed v1).

>  rename01A symlink01 -T rename01
>  splice02 splice02 -s 20
>  df01_sh df01.sh
> diff --git a/runtest/syscalls b/runtest/syscalls
> index b6cadb2df..1e1203503 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -1535,8 +1535,8 @@ stat02 stat02
>  stat02_64 stat02_64
>  stat03 stat03
>  stat03_64 stat03_64
> -stat04 symlink01 -T stat04
> -stat04_64 symlink01 -T stat04_64
> +stat04 stat04
> +stat04_64 stat04_64

OT: Out of curiosity, I'm looking into
testcases/kernel/syscalls/utils/newer_64.mk, I have no idea why there is
utils/newer_64.h part.

>  statfs01 statfs01
>  statfs01_64 statfs01_64
> diff --git a/testcases/kernel/syscalls/stat/.gitignore b/testcases/kernel/syscalls/stat/.gitignore
> index fa0a4ce9f..0a62dc6ee 100644
> --- a/testcases/kernel/syscalls/stat/.gitignore
> +++ b/testcases/kernel/syscalls/stat/.gitignore
> @@ -4,3 +4,5 @@
>  /stat02_64
>  /stat03
>  /stat03_64
> +/stat04
> +/stat04_64
> diff --git a/testcases/kernel/syscalls/stat/stat04.c b/testcases/kernel/syscalls/stat/stat04.c
> new file mode 100644
> index 000000000..4609f02d8
> --- /dev/null
> +++ b/testcases/kernel/syscalls/stat/stat04.c
> @@ -0,0 +1,120 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later

Also, original test was GPL v2 only, but with rewrite like this I guess we can
have GPL v2+.

> +/*
> + * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
> + *    Author: David Fenner, Jon Hendrickson
> + * Copyright (C) 2024 Andrea Cervesato <andrea.cervesato@suse.com>
> + */
> +
> +/*\
> + * [Description]
> + *
> + * This test checks that stat() executed on file provide the same information
> + * of symlink linking to it.
> + */
> +
> +#include <stdlib.h>
> +#include "tst_test.h"
> +
> +#define FILENAME "file.txt"
> +#define MNTPOINT "mntpoint"
> +#define SYMBNAME MNTPOINT"/file_symlink"
> +
> +static char symb_path[PATH_MAX];
> +static char file_path[PATH_MAX];
> +static struct stat *file_stat;
> +static struct stat *symb_stat;
> +static char *tmpdir;
> +
> +static void run(void)
> +{
> +	SAFE_STAT(file_path, file_stat);
> +	SAFE_STAT(symb_path, symb_stat);
> +
> +	TST_EXP_EQ_LI(file_stat->st_dev, symb_stat->st_dev);
> +	TST_EXP_EQ_LI(file_stat->st_mode, symb_stat->st_mode);
> +	TST_EXP_EQ_LI(file_stat->st_nlink, symb_stat->st_nlink);
> +	TST_EXP_EQ_LI(file_stat->st_uid, symb_stat->st_uid);
> +	TST_EXP_EQ_LI(file_stat->st_gid, symb_stat->st_gid);
> +	TST_EXP_EQ_LI(file_stat->st_size, symb_stat->st_size);
> +	TST_EXP_EQ_LI(file_stat->st_atime, symb_stat->st_atime);
> +	TST_EXP_EQ_LI(file_stat->st_mtime, symb_stat->st_mtime);
> +	TST_EXP_EQ_LI(file_stat->st_ctime, symb_stat->st_ctime);
> +}
> +
> +static void setup(void)
> +{
> +	char opt_bsize[32];
> +	const char *const fs_opts[] = {opt_bsize, NULL};
> +	struct stat sb;
> +	int pagesize;
> +	int fd;
> +
> +	tmpdir = tst_get_tmpdir();
> +
> +	if (strlen(tmpdir) >= (PATH_MAX - strlen(FILENAME))) {
> +		tst_brk(TCONF, "Temporary folder name is too long. "
> +			"Can't create file");
> +	}
> +
> +	if (strlen(tmpdir) >= (PATH_MAX - strlen(SYMBNAME))) {
> +		tst_brk(TCONF, "Temporary folder name is too long. "
> +			"Can't create symbolic link");
> +	}

PATH_MAX is 4096, right? Is it really needed to test the length?
> +
> +	/* change st_blksize / st_dev */
> +	SAFE_STAT(".", &sb);
> +	pagesize = sb.st_blksize == 4096 ? 1024 : 4096;
> +
> +	snprintf(opt_bsize, sizeof(opt_bsize), "-b %i", pagesize);
> +	SAFE_MKFS(tst_device->dev, tst_device->fs_type, fs_opts, NULL);
> +	SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, 0);

Isn't symlink filesystem related? Shouldn't this be run on all_filesystems?
But we could not force block size change.

> +
> +	SAFE_TOUCH(FILENAME, 0777, NULL);
> +
> +	/* change st_nlink */
> +	SAFE_LINK(FILENAME, "linked_file");
> +
> +	/* change st_uid and st_gid */
> +	SAFE_CHOWN(FILENAME, 1000, 1000);
> +
> +	/* change st_size */
> +	fd = SAFE_OPEN(FILENAME, O_WRONLY, 0777);
> +	tst_fill_fd(fd, 'a', TST_KB, 500);
> +	SAFE_CLOSE(fd);
> +
> +	/* change st_atime / st_mtime / st_ctime */
> +	usleep(1001000);
> +
> +	memset(file_path, 0, PATH_MAX);
> +	snprintf(file_path, PATH_MAX, "%s/%s", tmpdir, FILENAME);
> +
> +	memset(symb_path, 0, PATH_MAX);
> +	snprintf(symb_path, PATH_MAX, "%s/%s", tmpdir, SYMBNAME);
> +
> +	SAFE_SYMLINK(file_path, symb_path);
> +}
> +
> +static void cleanup(void)
> +{
> +	free(tmpdir);
nit: I know that tst_get_tmpdir() is first thing in setup(), but I would still
guard it with if (tmpdir) (code may change later).

> +
> +	SAFE_UNLINK(SYMBNAME);
nit: Ideally this would be guarded by flag that SAFE_SYMLINK(file_path,
symb_path) got executed.

> +
> +	if (tst_is_mounted(MNTPOINT))
> +		SAFE_UMOUNT(MNTPOINT);
> +}
> +
> +static struct tst_test test = {
> +	.setup = setup,
> +	.cleanup = cleanup,
> +	.test_all = run,
> +	.needs_root = 1,
> +	.needs_tmpdir = 1,
nit: useless tag: needs_tmpdir (can be removed before merge).

Reviewed-by: Petr Vorel <pvorel@suse.cz>

Kind regards,
Petr

> +	.needs_device = 1,
> +	.mntpoint = MNTPOINT,
> +	.bufs = (struct tst_buffers []) {
> +		{&file_stat, .size = sizeof(struct stat)},
> +		{&symb_stat, .size = sizeof(struct stat)},
> +		{}
> +	}
> +};
Andrea Cervesato July 10, 2024, 8:17 a.m. UTC | #2
Hi,

On 7/9/24 23:13, Petr Vorel wrote:
> Hi all,
>
>> From: Andrea Cervesato <andrea.cervesato@suse.com>
>> This test has been extracted from symlink01 test and it checks that
>> stat() executed on file provide the same information of symlink linking
>> to it.
>> Reviewed-by: Li Wang <liwang@redhat.com>
>> Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
>> ---
>>   runtest/smoketest                         |   4 +-
>>   runtest/syscalls                          |   4 +-
>>   testcases/kernel/syscalls/stat/.gitignore |   2 +
>>   testcases/kernel/syscalls/stat/stat04.c   | 120 ++++++++++++++++++++++++++++++
>>   4 files changed, 126 insertions(+), 4 deletions(-)
>> diff --git a/runtest/smoketest b/runtest/smoketest
>> index f6f14fd2b..5608417f9 100644
>> --- a/runtest/smoketest
>> +++ b/runtest/smoketest
>> @@ -8,8 +8,8 @@ time01 time01
>>   wait02 wait02
>>   write01 write01
>>   symlink01 symlink01
>> -stat04 symlink01 -T stat04
>> -utime07 utime07
>> +stat04 stat04
>> +utime01A symlink01 -T utime01
> nit: Why replace utime07 with utime01? I suggest to merge without this change
> (modify only stat04).
This must be an error
> Original test also tested ENOENT and ELOOP, but we have this in stat03.c.
> (you probably have been discussing this previously.)
Yeah there's no need for that since it's tested somewhere else.
>
> @Cyril: will you add your RBT (you reviewed v1).
>
>>   rename01A symlink01 -T rename01
>>   splice02 splice02 -s 20
>>   df01_sh df01.sh
>> diff --git a/runtest/syscalls b/runtest/syscalls
>> index b6cadb2df..1e1203503 100644
>> --- a/runtest/syscalls
>> +++ b/runtest/syscalls
>> @@ -1535,8 +1535,8 @@ stat02 stat02
>>   stat02_64 stat02_64
>>   stat03 stat03
>>   stat03_64 stat03_64
>> -stat04 symlink01 -T stat04
>> -stat04_64 symlink01 -T stat04_64
>> +stat04 stat04
>> +stat04_64 stat04_64
> OT: Out of curiosity, I'm looking into
> testcases/kernel/syscalls/utils/newer_64.mk, I have no idea why there is
> utils/newer_64.h part.
no idea...
>>   statfs01 statfs01
>>   statfs01_64 statfs01_64
>> diff --git a/testcases/kernel/syscalls/stat/.gitignore b/testcases/kernel/syscalls/stat/.gitignore
>> index fa0a4ce9f..0a62dc6ee 100644
>> --- a/testcases/kernel/syscalls/stat/.gitignore
>> +++ b/testcases/kernel/syscalls/stat/.gitignore
>> @@ -4,3 +4,5 @@
>>   /stat02_64
>>   /stat03
>>   /stat03_64
>> +/stat04
>> +/stat04_64
>> diff --git a/testcases/kernel/syscalls/stat/stat04.c b/testcases/kernel/syscalls/stat/stat04.c
>> new file mode 100644
>> index 000000000..4609f02d8
>> --- /dev/null
>> +++ b/testcases/kernel/syscalls/stat/stat04.c
>> @@ -0,0 +1,120 @@
>> +// SPDX-License-Identifier: GPL-2.0-or-later
> Also, original test was GPL v2 only, but with rewrite like this I guess we can
> have GPL v2+.
>
>> +/*
>> + * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
>> + *    Author: David Fenner, Jon Hendrickson
>> + * Copyright (C) 2024 Andrea Cervesato <andrea.cervesato@suse.com>
>> + */
>> +
>> +/*\
>> + * [Description]
>> + *
>> + * This test checks that stat() executed on file provide the same information
>> + * of symlink linking to it.
>> + */
>> +
>> +#include <stdlib.h>
>> +#include "tst_test.h"
>> +
>> +#define FILENAME "file.txt"
>> +#define MNTPOINT "mntpoint"
>> +#define SYMBNAME MNTPOINT"/file_symlink"
>> +
>> +static char symb_path[PATH_MAX];
>> +static char file_path[PATH_MAX];
>> +static struct stat *file_stat;
>> +static struct stat *symb_stat;
>> +static char *tmpdir;
>> +
>> +static void run(void)
>> +{
>> +	SAFE_STAT(file_path, file_stat);
>> +	SAFE_STAT(symb_path, symb_stat);
>> +
>> +	TST_EXP_EQ_LI(file_stat->st_dev, symb_stat->st_dev);
>> +	TST_EXP_EQ_LI(file_stat->st_mode, symb_stat->st_mode);
>> +	TST_EXP_EQ_LI(file_stat->st_nlink, symb_stat->st_nlink);
>> +	TST_EXP_EQ_LI(file_stat->st_uid, symb_stat->st_uid);
>> +	TST_EXP_EQ_LI(file_stat->st_gid, symb_stat->st_gid);
>> +	TST_EXP_EQ_LI(file_stat->st_size, symb_stat->st_size);
>> +	TST_EXP_EQ_LI(file_stat->st_atime, symb_stat->st_atime);
>> +	TST_EXP_EQ_LI(file_stat->st_mtime, symb_stat->st_mtime);
>> +	TST_EXP_EQ_LI(file_stat->st_ctime, symb_stat->st_ctime);
>> +}
>> +
>> +static void setup(void)
>> +{
>> +	char opt_bsize[32];
>> +	const char *const fs_opts[] = {opt_bsize, NULL};
>> +	struct stat sb;
>> +	int pagesize;
>> +	int fd;
>> +
>> +	tmpdir = tst_get_tmpdir();
>> +
>> +	if (strlen(tmpdir) >= (PATH_MAX - strlen(FILENAME))) {
>> +		tst_brk(TCONF, "Temporary folder name is too long. "
>> +			"Can't create file");
>> +	}
>> +
>> +	if (strlen(tmpdir) >= (PATH_MAX - strlen(SYMBNAME))) {
>> +		tst_brk(TCONF, "Temporary folder name is too long. "
>> +			"Can't create symbolic link");
>> +	}
> PATH_MAX is 4096, right? Is it really needed to test the length?
Yes, check previous conversation (easily buffer overflow).
>> +
>> +	/* change st_blksize / st_dev */
>> +	SAFE_STAT(".", &sb);
>> +	pagesize = sb.st_blksize == 4096 ? 1024 : 4096;
>> +
>> +	snprintf(opt_bsize, sizeof(opt_bsize), "-b %i", pagesize);
>> +	SAFE_MKFS(tst_device->dev, tst_device->fs_type, fs_opts, NULL);
>> +	SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, 0);
> Isn't symlink filesystem related? Shouldn't this be run on all_filesystems?
> But we could not force block size change.
This was suggested by @Cyril
>
>> +
>> +	SAFE_TOUCH(FILENAME, 0777, NULL);
>> +
>> +	/* change st_nlink */
>> +	SAFE_LINK(FILENAME, "linked_file");
>> +
>> +	/* change st_uid and st_gid */
>> +	SAFE_CHOWN(FILENAME, 1000, 1000);
>> +
>> +	/* change st_size */
>> +	fd = SAFE_OPEN(FILENAME, O_WRONLY, 0777);
>> +	tst_fill_fd(fd, 'a', TST_KB, 500);
>> +	SAFE_CLOSE(fd);
>> +
>> +	/* change st_atime / st_mtime / st_ctime */
>> +	usleep(1001000);
>> +
>> +	memset(file_path, 0, PATH_MAX);
>> +	snprintf(file_path, PATH_MAX, "%s/%s", tmpdir, FILENAME);
>> +
>> +	memset(symb_path, 0, PATH_MAX);
>> +	snprintf(symb_path, PATH_MAX, "%s/%s", tmpdir, SYMBNAME);
>> +
>> +	SAFE_SYMLINK(file_path, symb_path);
>> +}
>> +
>> +static void cleanup(void)
>> +{
>> +	free(tmpdir);
> nit: I know that tst_get_tmpdir() is first thing in setup(), but I would still
> guard it with if (tmpdir) (code may change later).
>
>> +
>> +	SAFE_UNLINK(SYMBNAME);
> nit: Ideally this would be guarded by flag that SAFE_SYMLINK(file_path,
> symb_path) got executed.
What if it doesn't?
>
>> +
>> +	if (tst_is_mounted(MNTPOINT))
>> +		SAFE_UMOUNT(MNTPOINT);
>> +}
>> +
>> +static struct tst_test test = {
>> +	.setup = setup,
>> +	.cleanup = cleanup,
>> +	.test_all = run,
>> +	.needs_root = 1,
>> +	.needs_tmpdir = 1,
> nit: useless tag: needs_tmpdir (can be removed before merge).
>
> Reviewed-by: Petr Vorel <pvorel@suse.cz>
>
> Kind regards,
> Petr
>
>> +	.needs_device = 1,
>> +	.mntpoint = MNTPOINT,
>> +	.bufs = (struct tst_buffers []) {
>> +		{&file_stat, .size = sizeof(struct stat)},
>> +		{&symb_stat, .size = sizeof(struct stat)},
>> +		{}
>> +	}
>> +};

Andrea
Petr Vorel July 10, 2024, 10:38 a.m. UTC | #3
Hi Andrea,

...
> > > +static void cleanup(void)
> > > +{
> > > +	free(tmpdir);
> > nit: I know that tst_get_tmpdir() is first thing in setup(), but I would still
> > guard it with if (tmpdir) (code may change later).

> > > +
> > > +	SAFE_UNLINK(SYMBNAME);
> > nit: Ideally this would be guarded by flag that SAFE_SYMLINK(file_path,
> > symb_path) got executed.
> What if it doesn't?

Well, just one more WARN, no big deal. Just it might be misleading for a
reviewer. I see you fixed it in v3, thanks!

Kind regards,
Petr
Cyril Hrubis July 10, 2024, 12:29 p.m. UTC | #4
Hi!
> PATH_MAX is 4096, right? Is it really needed to test the length?

Contrary to the popular belief PATH_MAX is a limit for lenght of a
single filesytem path component, i.e. directory or a file name. And yes
I've seen bugreports for LTP where people pointed TMPDIR to a deep
enough filesystem path for this to matter.

Anyways I've proposed to allocate the paths instead with asprintf().

> > +
> > +	/* change st_blksize / st_dev */
> > +	SAFE_STAT(".", &sb);
> > +	pagesize = sb.st_blksize == 4096 ? 1024 : 4096;
> > +
> > +	snprintf(opt_bsize, sizeof(opt_bsize), "-b %i", pagesize);
> > +	SAFE_MKFS(tst_device->dev, tst_device->fs_type, fs_opts, NULL);
> > +	SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, 0);
> 
> Isn't symlink filesystem related? Shouldn't this be run on all_filesystems?

Hmm, I was assuming that symlink was a generic funcionality, but
thinking about it the symlink data has to be stored in the filesystem so
I suppose that there is some filesystem specific code to be tested after
all.

I guess that this could stil be implemented but we would have to add
support for multiple devices. I can have a look later on, but I wouldn't
block this patch because of that.

> > +
> > +	SAFE_TOUCH(FILENAME, 0777, NULL);
> > +
> > +	/* change st_nlink */
> > +	SAFE_LINK(FILENAME, "linked_file");
> > +
> > +	/* change st_uid and st_gid */
> > +	SAFE_CHOWN(FILENAME, 1000, 1000);
> > +
> > +	/* change st_size */
> > +	fd = SAFE_OPEN(FILENAME, O_WRONLY, 0777);
> > +	tst_fill_fd(fd, 'a', TST_KB, 500);
> > +	SAFE_CLOSE(fd);
> > +
> > +	/* change st_atime / st_mtime / st_ctime */
> > +	usleep(1001000);
> > +
> > +	memset(file_path, 0, PATH_MAX);
> > +	snprintf(file_path, PATH_MAX, "%s/%s", tmpdir, FILENAME);
> > +
> > +	memset(symb_path, 0, PATH_MAX);
> > +	snprintf(symb_path, PATH_MAX, "%s/%s", tmpdir, SYMBNAME);
> > +
> > +	SAFE_SYMLINK(file_path, symb_path);
> > +}
> > +
> > +static void cleanup(void)
> > +{
> > +	free(tmpdir);
> nit: I know that tst_get_tmpdir() is first thing in setup(), but I would still
> guard it with if (tmpdir) (code may change later).
> 
> > +
> > +	SAFE_UNLINK(SYMBNAME);
> nit: Ideally this would be guarded by flag that SAFE_SYMLINK(file_path,
> symb_path) got executed.

I do not think that we need to unlink the symlink, it should be removed
by the test library when the temorary directory is removed. Or is there
a problem with that?
diff mbox series

Patch

diff --git a/runtest/smoketest b/runtest/smoketest
index f6f14fd2b..5608417f9 100644
--- a/runtest/smoketest
+++ b/runtest/smoketest
@@ -8,8 +8,8 @@  time01 time01
 wait02 wait02
 write01 write01
 symlink01 symlink01
-stat04 symlink01 -T stat04
-utime07 utime07
+stat04 stat04
+utime01A symlink01 -T utime01
 rename01A symlink01 -T rename01
 splice02 splice02 -s 20
 df01_sh df01.sh
diff --git a/runtest/syscalls b/runtest/syscalls
index b6cadb2df..1e1203503 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1535,8 +1535,8 @@  stat02 stat02
 stat02_64 stat02_64
 stat03 stat03
 stat03_64 stat03_64
-stat04 symlink01 -T stat04
-stat04_64 symlink01 -T stat04_64
+stat04 stat04
+stat04_64 stat04_64
 
 statfs01 statfs01
 statfs01_64 statfs01_64
diff --git a/testcases/kernel/syscalls/stat/.gitignore b/testcases/kernel/syscalls/stat/.gitignore
index fa0a4ce9f..0a62dc6ee 100644
--- a/testcases/kernel/syscalls/stat/.gitignore
+++ b/testcases/kernel/syscalls/stat/.gitignore
@@ -4,3 +4,5 @@ 
 /stat02_64
 /stat03
 /stat03_64
+/stat04
+/stat04_64
diff --git a/testcases/kernel/syscalls/stat/stat04.c b/testcases/kernel/syscalls/stat/stat04.c
new file mode 100644
index 000000000..4609f02d8
--- /dev/null
+++ b/testcases/kernel/syscalls/stat/stat04.c
@@ -0,0 +1,120 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
+ *    Author: David Fenner, Jon Hendrickson
+ * Copyright (C) 2024 Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * This test checks that stat() executed on file provide the same information
+ * of symlink linking to it.
+ */
+
+#include <stdlib.h>
+#include "tst_test.h"
+
+#define FILENAME "file.txt"
+#define MNTPOINT "mntpoint"
+#define SYMBNAME MNTPOINT"/file_symlink"
+
+static char symb_path[PATH_MAX];
+static char file_path[PATH_MAX];
+static struct stat *file_stat;
+static struct stat *symb_stat;
+static char *tmpdir;
+
+static void run(void)
+{
+	SAFE_STAT(file_path, file_stat);
+	SAFE_STAT(symb_path, symb_stat);
+
+	TST_EXP_EQ_LI(file_stat->st_dev, symb_stat->st_dev);
+	TST_EXP_EQ_LI(file_stat->st_mode, symb_stat->st_mode);
+	TST_EXP_EQ_LI(file_stat->st_nlink, symb_stat->st_nlink);
+	TST_EXP_EQ_LI(file_stat->st_uid, symb_stat->st_uid);
+	TST_EXP_EQ_LI(file_stat->st_gid, symb_stat->st_gid);
+	TST_EXP_EQ_LI(file_stat->st_size, symb_stat->st_size);
+	TST_EXP_EQ_LI(file_stat->st_atime, symb_stat->st_atime);
+	TST_EXP_EQ_LI(file_stat->st_mtime, symb_stat->st_mtime);
+	TST_EXP_EQ_LI(file_stat->st_ctime, symb_stat->st_ctime);
+}
+
+static void setup(void)
+{
+	char opt_bsize[32];
+	const char *const fs_opts[] = {opt_bsize, NULL};
+	struct stat sb;
+	int pagesize;
+	int fd;
+
+	tmpdir = tst_get_tmpdir();
+
+	if (strlen(tmpdir) >= (PATH_MAX - strlen(FILENAME))) {
+		tst_brk(TCONF, "Temporary folder name is too long. "
+			"Can't create file");
+	}
+
+	if (strlen(tmpdir) >= (PATH_MAX - strlen(SYMBNAME))) {
+		tst_brk(TCONF, "Temporary folder name is too long. "
+			"Can't create symbolic link");
+	}
+
+	/* change st_blksize / st_dev */
+	SAFE_STAT(".", &sb);
+	pagesize = sb.st_blksize == 4096 ? 1024 : 4096;
+
+	snprintf(opt_bsize, sizeof(opt_bsize), "-b %i", pagesize);
+	SAFE_MKFS(tst_device->dev, tst_device->fs_type, fs_opts, NULL);
+	SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, 0);
+
+	SAFE_TOUCH(FILENAME, 0777, NULL);
+
+	/* change st_nlink */
+	SAFE_LINK(FILENAME, "linked_file");
+
+	/* change st_uid and st_gid */
+	SAFE_CHOWN(FILENAME, 1000, 1000);
+
+	/* change st_size */
+	fd = SAFE_OPEN(FILENAME, O_WRONLY, 0777);
+	tst_fill_fd(fd, 'a', TST_KB, 500);
+	SAFE_CLOSE(fd);
+
+	/* change st_atime / st_mtime / st_ctime */
+	usleep(1001000);
+
+	memset(file_path, 0, PATH_MAX);
+	snprintf(file_path, PATH_MAX, "%s/%s", tmpdir, FILENAME);
+
+	memset(symb_path, 0, PATH_MAX);
+	snprintf(symb_path, PATH_MAX, "%s/%s", tmpdir, SYMBNAME);
+
+	SAFE_SYMLINK(file_path, symb_path);
+}
+
+static void cleanup(void)
+{
+	free(tmpdir);
+
+	SAFE_UNLINK(SYMBNAME);
+
+	if (tst_is_mounted(MNTPOINT))
+		SAFE_UMOUNT(MNTPOINT);
+}
+
+static struct tst_test test = {
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run,
+	.needs_root = 1,
+	.needs_tmpdir = 1,
+	.needs_device = 1,
+	.mntpoint = MNTPOINT,
+	.bufs = (struct tst_buffers []) {
+		{&file_stat, .size = sizeof(struct stat)},
+		{&symb_stat, .size = sizeof(struct stat)},
+		{}
+	}
+};