static void setup(void)
{
struct stat c_buf, l_buf;
if ((tst_kvercmp(2, 6, 16)) < 0)
tst_brkm(TCONF, NULL, "This test needs kernel 2.6.16 or newer");
tst_require_root(NULL);
tst_sig(NOFORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
tst_tmpdir();
dirfd = SAFE_OPEN(cleanup, "./", O_DIRECTORY);
SAFE_TOUCH(cleanup, TESTFILE, 0600, NULL);
SAFE_SYMLINK(cleanup, TESTFILE, TESTFILE_LINK);
SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
if (l_buf.st_uid == set_uid || l_buf.st_gid == set_gid) {
tst_brkm(TBROK | TERRNO, cleanup,
"link_uid(%d) == set_uid(%d) or link_gid(%d) == "
"set_gid(%d)", l_buf.st_uid, set_uid, l_buf.st_gid,
set_gid);
}
}
/*
* We try raising bdi readahead limit as much as we can. We write
* and read back "read_ahead_kb" sysfs value, starting with filesize.
* If that fails, we try again with lower value.
* readahead_length used in the test is then set to MIN(bdi limit, 2M),
* to respect kernels prior to commit 600e19afc5f8a6c.
*/
static void setup_readahead_length(void)
{
struct stat sbuf;
char tmp[PATH_MAX], *backing_dev;
int ra_new_limit, ra_limit;
/* Find out backing device name */
SAFE_LSTAT(tst_device->dev, &sbuf);
if (S_ISLNK(sbuf.st_mode))
SAFE_READLINK(tst_device->dev, tmp, PATH_MAX);
else
strcpy(tmp, tst_device->dev);
backing_dev = basename(tmp);
sprintf(sys_bdi_ra_path, "/sys/class/block/%s/bdi/read_ahead_kb",
backing_dev);
if (access(sys_bdi_ra_path, F_OK))
return;
SAFE_FILE_SCANF(sys_bdi_ra_path, "%d", &orig_bdi_limit);
/* raise bdi limit as much as kernel allows */
ra_new_limit = testfile_size / 1024;
while (ra_new_limit > pagesize / 1024) {
FILE_PRINTF(sys_bdi_ra_path, "%d", ra_new_limit);
SAFE_FILE_SCANF(sys_bdi_ra_path, "%d", &ra_limit);
if (ra_limit == ra_new_limit) {
readahead_length = MIN(ra_new_limit * 1024,
2 * 1024 * 1024);
break;
}
ra_new_limit = ra_new_limit / 2;
}
}
static void test_verify(void)
{
struct stat c_buf, l_buf;
SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
if (c_buf.st_uid != set_uid && l_buf.st_uid == set_uid &&
c_buf.st_gid != set_gid && l_buf.st_gid == set_gid) {
tst_resm(TPASS, "fchownat() test AT_SYMLINK_NOFOLLOW success");
} else {
tst_resm(TFAIL,
"fchownat() test AT_SYMLINK_NOFOLLOW fail with uid=%d "
"link_uid=%d set_uid=%d | gid=%d link_gid=%d "
"set_gid=%d", c_buf.st_uid, l_buf.st_uid, set_uid,
c_buf.st_gid, l_buf.st_gid, set_gid);
}
}
