[LTP] [PATCH v3 2/4] Add lstat03 test

[Andrea Cervesato]

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

This test has been extracted from symlink01 test and it checks that
lstat() provides the right information, according with device, access
time, block size, ownership, etc.

Reviewed-by: Li Wang <liwang@redhat.com>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                           |   4 +-
 testcases/kernel/syscalls/lstat/.gitignore |   2 +
 testcases/kernel/syscalls/lstat/lstat03.c  | 102 +++++++++++++++++++++++++++++
 3 files changed, 106 insertions(+), 2 deletions(-)

diff --git a/runtest/syscalls b/runtest/syscalls
index 1e1203503..160725893 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -725,12 +725,12 @@ lseek02 lseek02
 lseek07 lseek07
 lseek11 lseek11
 
-lstat01A symlink01 -T lstat01
-lstat01A_64 symlink01 -T lstat01_64
 lstat01 lstat01
 lstat01_64 lstat01_64
 lstat02 lstat02
 lstat02_64 lstat02_64
+lstat03 lstat03
+lstat03_64 lstat03_64
 
 mallinfo02 mallinfo02
 
diff --git a/testcases/kernel/syscalls/lstat/.gitignore b/testcases/kernel/syscalls/lstat/.gitignore
index a497a445f..72cba871f 100644
--- a/testcases/kernel/syscalls/lstat/.gitignore
+++ b/testcases/kernel/syscalls/lstat/.gitignore
@@ -2,3 +2,5 @@
 /lstat01_64
 /lstat02
 /lstat02_64
+/lstat03
+/lstat03_64
diff --git a/testcases/kernel/syscalls/lstat/lstat03.c b/testcases/kernel/syscalls/lstat/lstat03.c
new file mode 100644
index 000000000..134efb471
--- /dev/null
+++ b/testcases/kernel/syscalls/lstat/lstat03.c
@@ -0,0 +1,102 @@
+// 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 verifies that lstat() provides correct information according
+ * with device, access time, block size, ownership, etc.
+ * The implementation provides a set of tests which are specific for each one
+ * of the `struct stat` used to read file and symlink information.
+ */
+
+#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 void run(void)
+{
+	SAFE_LSTAT(FILENAME, file_stat);
+	SAFE_LSTAT(SYMBNAME, symb_stat);
+
+	TST_EXP_EXPR(file_stat->st_dev != symb_stat->st_dev);
+	TST_EXP_EXPR(file_stat->st_mode != symb_stat->st_mode);
+	TST_EXP_EXPR(file_stat->st_nlink != symb_stat->st_nlink);
+	TST_EXP_EXPR(file_stat->st_ino != symb_stat->st_ino);
+	TST_EXP_EXPR(file_stat->st_uid != symb_stat->st_uid);
+	TST_EXP_EXPR(file_stat->st_gid != symb_stat->st_gid);
+	TST_EXP_EXPR(file_stat->st_size != symb_stat->st_size);
+	TST_EXP_EXPR(file_stat->st_blocks != symb_stat->st_blocks);
+	TST_EXP_EXPR(file_stat->st_blksize != symb_stat->st_blksize);
+	TST_EXP_EXPR(file_stat->st_atime != symb_stat->st_atime);
+	TST_EXP_EXPR(file_stat->st_mtime != symb_stat->st_mtime);
+	TST_EXP_EXPR(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;
+
+	/* 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);
+
+	SAFE_SYMLINK(FILENAME, SYMBNAME);
+}
+
+static void cleanup(void)
+{
+	if (access(SYMBNAME, F_OK) != -1)
+		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)},
+		{}
+	}
+};

-- 
2.43.0