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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2014 Fujitsu Ltd.
* Author: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
*/
/*
* Test Description:
* Verify that,
* 1. link() fails with -1 return value and sets errno to EPERM
* if oldpath is a directory.
* 2. link() fails with -1 return value and sets errno to EXDEV
* if oldpath and newpath are not on the same mounted file system( Linux
* permits a file system to be mounted at multiple points, but link()
* does not work across different mount points, even if the same
* file system is mounted on both. ).
* 3. link() fails with -1 return value and sets errno to EROFS
* if the file is on a read-only file system.
* 4. link() fails with -1 return value and sets errno to ELOOP
* if too many symbolic links were encountered in resolving path.
*/
#include <errno.h>
#include "tst_test.h"
#define DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
S_IXGRP|S_IROTH|S_IXOTH)
#define MNT_POINT "mntpoint"
#define TEST_FILE "testfile"
#define TEST_FILE1 "testfile1"
#define TEST_FILE2 "mntpoint/file"
#define TEST_FILE3 "mntpoint/testfile4"
static char test_file4[PATH_MAX] = ".";
static void setup(void);
static struct tcase {
char *oldpath;
char *newpath;
int exp_errno;
} tcases[] = {
{TEST_FILE1, TEST_FILE, EPERM},
{TEST_FILE2, TEST_FILE, EXDEV},
{TEST_FILE2, TEST_FILE3, EROFS},
{test_file4, TEST_FILE, ELOOP},
};
static void link_verify(unsigned int i)
{
struct tcase *tc = &tcases[i];
TEST(link(tc->oldpath, tc->newpath));
if (TST_RET != -1) {
tst_res(TFAIL, "link() succeeded unexpectedly (%li)",
TST_RET);
return;
}
if (TST_ERR == tc->exp_errno) {
tst_res(TPASS | TTERRNO, "link() failed as expected");
return;
}
tst_res(TFAIL | TTERRNO,
"link() failed unexpectedly; expected: %d - %s",
tc->exp_errno, tst_strerrno(tc->exp_errno));
}
static void setup(void)
{
int i;
SAFE_MKDIR(TEST_FILE1, DIR_MODE);
SAFE_MKDIR("test_eloop", DIR_MODE);
SAFE_SYMLINK("../test_eloop", "test_eloop/test_eloop");
for (i = 0; i < 43; i++)
strcat(test_file4, "/test_eloop");
}
static struct tst_test test = {
.setup = setup,
.test = link_verify,
.tcnt = ARRAY_SIZE(tcases),
.needs_root = 1,
.needs_rofs = 1,
.mntpoint = MNT_POINT,
};
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