// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
* Author: Yang Xu <xuyang2018.jy@cn.jujitsu.com>
*
* This is a basic ioctl test about loopdevice.
*
* It is designed to test LO_FLAGS_READ_ONLY (similar as losetup -r)
* and LOOP_CHANGE_FD.
*
* For LOOP_CHANGE_FD, this operation is possible only if the loop device
* is read-only and the new backing store is the same size and type as the
* old backing store.
*
* If using LOOP_CONFIGURE ioctl, we can set LO_FLAGS_READ_ONLY
* flag even though backing file with write mode.
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include "lapi/loop.h"
#include "tst_test.h"
static int file_fd, file_change_fd, file_fd_invalid;
static char backing_path[1024], backing_file_path[1024], backing_file_change_path[1024];
static int attach_flag, dev_fd, loop_configure_sup = 1;
static char loop_ro_path[1024], dev_path[1024];
static struct loop_config loopconfig;
static struct tcase {
int mode;
int ioctl;
char *message;
} tcases[] = {
{O_RDONLY, LOOP_SET_FD, "Using LOOP_SET_FD to setup loopdevice"},
{O_RDWR, LOOP_CONFIGURE, "Using LOOP_CONFIGURE with read_only flag"},
};
static void verify_ioctl_loop(unsigned int n)
{
struct tcase *tc = &tcases[n];
struct loop_info loopinfoget;
if (tc->ioctl == LOOP_CONFIGURE && !loop_configure_sup) {
tst_res(TCONF, "LOOP_CONFIGURE ioctl not supported");
return;
}
tst_res(TINFO, "%s", tc->message);
file_fd = SAFE_OPEN("test.img", tc->mode);
if (tc->ioctl == LOOP_SET_FD) {
SAFE_IOCTL(dev_fd, LOOP_SET_FD, file_fd);
} else {
loopconfig.fd = file_fd;
SAFE_IOCTL(dev_fd, LOOP_CONFIGURE, &loopconfig);
}
attach_flag = 1;
TST_ASSERT_INT(loop_ro_path, 1);
TST_ASSERT_STR(backing_path, backing_file_path);
memset(&loopinfoget, 0, sizeof(loopinfoget));
SAFE_IOCTL(dev_fd, LOOP_GET_STATUS, &loopinfoget);
if (loopinfoget.lo_flags & ~LO_FLAGS_READ_ONLY)
tst_res(TFAIL, "lo_flags has unexpected %d flag", loopinfoget.lo_flags);
else
tst_res(TPASS, "lo_flags only has default LO_FLAGS_READ_ONLY flag");
TEST(write(dev_fd, "xx", 2));
if (TST_RET != -1)
tst_res(TFAIL, "write succeed unexpectedly");
else
tst_res(TPASS | TTERRNO, "Can not write data in RO mode");
TEST(ioctl(dev_fd, LOOP_CHANGE_FD, file_change_fd));
if (TST_RET) {
tst_res(TFAIL | TTERRNO, "LOOP_CHANGE_FD failed");
} else {
tst_res(TPASS, "LOOP_CHANGE_FD succeeded");
TST_ASSERT_INT(loop_ro_path, 1);
TST_ASSERT_STR(backing_path, backing_file_change_path);
}
TEST(ioctl(dev_fd, LOOP_CHANGE_FD, file_fd_invalid));
if (TST_RET) {
if (TST_ERR == EINVAL)
tst_res(TPASS | TTERRNO, "LOOP_CHANGE_FD failed as expected");
else
tst_res(TFAIL | TTERRNO, "LOOP_CHANGE_FD failed expected EINVAL got");
} else {
tst_res(TFAIL, "LOOP_CHANGE_FD succeeded");
}
SAFE_CLOSE(file_fd);
tst_detach_device_by_fd(dev_path, dev_fd);
attach_flag = 0;
}
static void setup(void)
{
int dev_num;
int ret;
char *tmpdir = tst_get_tmpdir();
dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
if (dev_num < 0)
tst_brk(TBROK, "Failed to find free loop device");
tst_fill_file("test.img", 0, 1024, 10);
tst_fill_file("test1.img", 0, 1024, 10);
tst_fill_file("test2.img", 0, 2048, 20);
sprintf(backing_path, "/sys/block/loop%d/loop/backing_file", dev_num);
sprintf(backing_file_path, "%s/test.img", tmpdir);
sprintf(backing_file_change_path, "%s/test1.img", tmpdir);
sprintf(loop_ro_path, "/sys/block/loop%d/ro", dev_num);
free(tmpdir);
file_change_fd = SAFE_OPEN("test1.img", O_RDWR);
file_fd_invalid = SAFE_OPEN("test2.img", O_RDWR);
dev_fd = SAFE_OPEN(dev_path, O_RDWR);
loopconfig.fd = -1;
ret = ioctl(dev_fd, LOOP_CONFIGURE, &loopconfig);
if (ret && errno != EBADF) {
tst_res(TINFO | TERRNO, "LOOP_CONFIGURE is not supported");
loop_configure_sup = 0;
}
loopconfig.info.lo_flags = LO_FLAGS_READ_ONLY;
}
static void cleanup(void)
{
if (dev_fd > 0)
SAFE_CLOSE(dev_fd);
if (file_fd > 0)
SAFE_CLOSE(file_fd);
if (file_change_fd > 0)
SAFE_CLOSE(file_change_fd);
if (file_fd_invalid > 0)
SAFE_CLOSE(file_fd_invalid);
if (attach_flag)
tst_detach_device(dev_path);
}
static struct tst_test test = {
.setup = setup,
.cleanup = cleanup,
.tcnt = ARRAY_SIZE(tcases),
.test = verify_ioctl_loop,
.needs_root = 1,
.needs_tmpdir = 1,
.needs_drivers = (const char *const []) {
"loop",
NULL
}
};
