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#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/sysmacros.h>
#include "zdtmtst.h"
const char *test_doc = "Check that we can migrate with a device special file "
"open in a directory which has been mounted over by "
"another filesystem";
const char *test_author = "Roman Kagan <rkagan@parallels.com>";
char *dirname;
TEST_OPTION(dirname, string, "directory name", 1);
int main(int argc, char **argv)
{
int fd;
char path[256];
struct stat st;
/* /dev/null params - sure to exist in a VPS */
mode_t mode = S_IFCHR | 0700;
dev_t dev = makedev(1, 3);
test_init(argc, argv);
if (snprintf(path, sizeof(path), "%s/foo", dirname) >= sizeof(path)) {
pr_perror("directory name \"%s\"is too long", dirname);
exit(1);
}
if (mkdir(dirname, 0700)) {
pr_perror("can't make directory %s", dirname);
exit(1);
}
if (mknod(path, mode, dev)) {
pr_perror("can't make device file \"%s\"", path);
exit(1);
}
fd = open(path, O_RDWR);
if (fd < 0) {
pr_perror("can't open %s", path);
goto rmdir;
}
if (mount("rien", dirname, "tmpfs", 0, 0) < 0) {
pr_perror("can't mount tmpfs over %s", dirname);
goto cleanup;
}
test_daemon();
test_waitsig();
if (umount(dirname) < 0) {
fail("can't umount %s", dirname);
goto cleanup;
}
if (close(fd) < 0) {
fail("can't close %s", path);
goto unlink;
}
if (stat(path, &st) < 0) {
fail("can't stat %s", path);
goto unlink;
}
if (st.st_mode != mode || st.st_rdev != dev) {
fail("%s is no longer the device file we had", path);
goto unlink;
}
if (unlink(path) < 0) {
fail("can't unlink %s", path);
goto rmdir;
}
pass();
goto rmdir;
cleanup:
close(fd);
unlink:
unlink(path);
rmdir:
rmdir(dirname);
return 0;
}
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