[LTP] [PATCH 1/5] Add stat04 test

[Andrea Cervesato]

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.

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   | 121 ++++++++++++++++++++++++++++++
 4 files changed, 127 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
 rename01A symlink01 -T rename01
 splice02 splice02 -s 20
 df01_sh df01.sh
diff --git a/runtest/syscalls b/runtest/syscalls
index 44a577db3..3e7a5ca1b 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..ee635dbd9
--- /dev/null
+++ b/testcases/kernel/syscalls/stat/stat04.c
@@ -0,0 +1,121 @@
+// 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 struct stat *file_stat;
+static struct stat *symb_stat;
+static char *tmpdir;
+
+static void run(void)
+{
+	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];
+	char symb_path[PATH_MAX];
+	char file_path[PATH_MAX];
+	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 */
+	sleep(1);
+
+	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);
+
+	SAFE_STAT(file_path, file_stat);
+	SAFE_STAT(symb_path, symb_stat);
+}
+
+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,
+	.dev_fs_type = "ext2",
+	.bufs = (struct tst_buffers []) {
+		{&file_stat, .size = sizeof(struct stat)},
+		{&symb_stat, .size = sizeof(struct stat)},
+		{}
+	}
+};

-- 
2.43.0