158 lines
4.8 KiB
C
158 lines
4.8 KiB
C
// 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 LOOP_SET_DIRECT_IO can update a live
|
|
* loop device dio mode. It needs the backing file also supports
|
|
* dio mode and the lo_offset is aligned with the logical block size.
|
|
*
|
|
* The direct I/O error handling is a bit messy on Linux, some filesystems
|
|
* return error when it coudln't be enabled, some silently fall back to regular
|
|
* buffered I/O.
|
|
*
|
|
* The LOOP_SET_DIRECT_IO ioctl() may ignore all checks if it cannot get the
|
|
* logical block size which is the case if the block device pointer in the
|
|
* backing file inode is not set. In this case the direct I/O appears to be
|
|
* enabled but falls back to buffered I/O later on. This is the case at least
|
|
* for Btrfs. Because of that the test passes both with failure as well as
|
|
* success with non-zero offset.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <sys/mount.h>
|
|
#include "lapi/loop.h"
|
|
#include "tst_test.h"
|
|
|
|
#define DIO_MESSAGE "In dio mode"
|
|
#define NON_DIO_MESSAGE "In non dio mode"
|
|
|
|
static char dev_path[1024], sys_loop_diopath[1024], backing_file_path[1024];;
|
|
static int dev_num, dev_fd, block_devfd, attach_flag, logical_block_size;
|
|
|
|
static void check_dio_value(int flag)
|
|
{
|
|
struct loop_info loopinfoget;
|
|
|
|
memset(&loopinfoget, 0, sizeof(loopinfoget));
|
|
|
|
SAFE_IOCTL(dev_fd, LOOP_GET_STATUS, &loopinfoget);
|
|
tst_res(TINFO, "%s", flag ? DIO_MESSAGE : NON_DIO_MESSAGE);
|
|
|
|
if (loopinfoget.lo_flags & LO_FLAGS_DIRECT_IO)
|
|
tst_res(flag ? TPASS : TFAIL, "lo_flags has LO_FLAGS_DIRECT_IO flag");
|
|
else
|
|
tst_res(flag ? TFAIL : TPASS, "lo_flags doesn't have LO_FLAGS_DIRECT_IO flag");
|
|
|
|
TST_ASSERT_INT(sys_loop_diopath, flag);
|
|
}
|
|
|
|
static void verify_ioctl_loop(void)
|
|
{
|
|
struct loop_info loopinfo;
|
|
|
|
memset(&loopinfo, 0, sizeof(loopinfo));
|
|
TST_RETRY_FUNC(ioctl(dev_fd, LOOP_SET_STATUS, &loopinfo), TST_RETVAL_EQ0);
|
|
|
|
tst_res(TINFO, "Without setting lo_offset or sizelimit");
|
|
SAFE_IOCTL(dev_fd, LOOP_SET_DIRECT_IO, 1);
|
|
check_dio_value(1);
|
|
|
|
SAFE_IOCTL(dev_fd, LOOP_SET_DIRECT_IO, 0);
|
|
check_dio_value(0);
|
|
|
|
tst_res(TINFO, "With offset equal to logical_block_size");
|
|
loopinfo.lo_offset = logical_block_size;
|
|
TST_RETRY_FUNC(ioctl(dev_fd, LOOP_SET_STATUS, &loopinfo), TST_RETVAL_EQ0);
|
|
TEST(ioctl(dev_fd, LOOP_SET_DIRECT_IO, 1));
|
|
if (TST_RET == 0) {
|
|
tst_res(TPASS, "LOOP_SET_DIRECT_IO succeeded");
|
|
check_dio_value(1);
|
|
SAFE_IOCTL(dev_fd, LOOP_SET_DIRECT_IO, 0);
|
|
} else {
|
|
tst_res(TFAIL | TTERRNO, "LOOP_SET_DIRECT_IO failed");
|
|
}
|
|
|
|
tst_res(TINFO, "With nonzero offset less than logical_block_size");
|
|
loopinfo.lo_offset = logical_block_size / 2;
|
|
TST_RETRY_FUNC(ioctl(dev_fd, LOOP_SET_STATUS, &loopinfo), TST_RETVAL_EQ0);
|
|
|
|
TEST(ioctl(dev_fd, LOOP_SET_DIRECT_IO, 1));
|
|
if (TST_RET == 0) {
|
|
tst_res(TPASS, "LOOP_SET_DIRECT_IO succeeded, offset is ignored");
|
|
SAFE_IOCTL(dev_fd, LOOP_SET_DIRECT_IO, 0);
|
|
return;
|
|
}
|
|
if (TST_ERR == EINVAL)
|
|
tst_res(TPASS | TTERRNO, "LOOP_SET_DIRECT_IO failed as expected");
|
|
else
|
|
tst_res(TFAIL | TTERRNO, "LOOP_SET_DIRECT_IO failed expected EINVAL got");
|
|
}
|
|
|
|
static void setup(void)
|
|
{
|
|
char bd_path[100];
|
|
|
|
dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
|
|
if (dev_num < 0)
|
|
tst_brk(TBROK, "Failed to find free loop device");
|
|
|
|
sprintf(sys_loop_diopath, "/sys/block/loop%d/loop/dio", dev_num);
|
|
tst_fill_file("test.img", 0, 1024, 1024);
|
|
|
|
tst_attach_device(dev_path, "test.img");
|
|
attach_flag = 1;
|
|
dev_fd = SAFE_OPEN(dev_path, O_RDWR);
|
|
|
|
if (ioctl(dev_fd, LOOP_SET_DIRECT_IO, 0) && errno == EINVAL)
|
|
tst_brk(TCONF, "LOOP_SET_DIRECT_IO is not supported");
|
|
|
|
/*
|
|
* from __loop_update_dio():
|
|
* We support direct I/O only if lo_offset is aligned with the
|
|
* logical I/O size of backing device, and the logical block
|
|
* size of loop is bigger than the backing device's and the loop
|
|
* needn't transform transfer.
|
|
*/
|
|
sprintf(backing_file_path, "%s/test.img", tst_get_tmpdir());
|
|
tst_find_backing_dev(backing_file_path, bd_path);
|
|
block_devfd = SAFE_OPEN(bd_path, O_RDWR);
|
|
SAFE_IOCTL(block_devfd, BLKSSZGET, &logical_block_size);
|
|
tst_res(TINFO, "backing dev(%s) logical_block_size is %d", bd_path, logical_block_size);
|
|
SAFE_CLOSE(block_devfd);
|
|
if (logical_block_size > 512)
|
|
TST_RETRY_FUNC(ioctl(dev_fd, LOOP_SET_BLOCK_SIZE, logical_block_size), TST_RETVAL_EQ0);
|
|
}
|
|
|
|
static void cleanup(void)
|
|
{
|
|
if (dev_fd > 0)
|
|
SAFE_CLOSE(dev_fd);
|
|
if (block_devfd > 0)
|
|
SAFE_CLOSE(block_devfd);
|
|
if (attach_flag)
|
|
tst_detach_device(dev_path);
|
|
}
|
|
|
|
static struct tst_test test = {
|
|
.setup = setup,
|
|
.cleanup = cleanup,
|
|
.test_all = verify_ioctl_loop,
|
|
.needs_root = 1,
|
|
.needs_tmpdir = 1,
|
|
.skip_filesystems = (const char *const []) {
|
|
"tmpfs",
|
|
"overlayfs",
|
|
NULL
|
|
},
|
|
.needs_drivers = (const char *const []) {
|
|
"loop",
|
|
NULL
|
|
}
|
|
};
|