99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
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* Author: Yang Xu <xuyang2018.jy@cn.jujitsu.com>
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*
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* This is a basic ioctl test about loopdevice.
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*
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* It is designed to test LOOP_SET_CAPACITY can update a live
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* loop device size when we change the size of the underlying
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* backing file. Also check sys value.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include "lapi/loop.h"
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#include "tst_test.h"
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#define OLD_SIZE 10240
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#define NEW_SIZE 5120
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static char dev_path[1024], sys_loop_sizepath[1024];
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static char *wrbuf;
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static int dev_num, dev_fd, file_fd, attach_flag;
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static void verify_ioctl_loop(void)
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{
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struct loop_info loopinfoget;
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memset(&loopinfoget, 0, sizeof(loopinfoget));
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tst_fill_file("test.img", 0, 1024, OLD_SIZE/1024);
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tst_attach_device(dev_path, "test.img");
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attach_flag = 1;
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TST_ASSERT_INT(sys_loop_sizepath, OLD_SIZE/512);
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file_fd = SAFE_OPEN("test.img", O_RDWR);
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SAFE_IOCTL(dev_fd, LOOP_GET_STATUS, &loopinfoget);
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if (loopinfoget.lo_flags & LO_FLAGS_READ_ONLY)
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tst_brk(TCONF, "Current environment has unexpected LO_FLAGS_READ_ONLY flag");
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SAFE_TRUNCATE("test.img", NEW_SIZE);
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SAFE_IOCTL(dev_fd, LOOP_SET_CAPACITY);
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SAFE_LSEEK(dev_fd, 0, SEEK_SET);
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/*check that we can't write data beyond 5K into loop device*/
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TEST(write(dev_fd, wrbuf, OLD_SIZE));
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if (TST_RET == NEW_SIZE) {
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tst_res(TPASS, "LOOP_SET_CAPACITY set loop size to %d", NEW_SIZE);
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} else {
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tst_res(TFAIL, "LOOP_SET_CAPACITY didn't set loop size to %d, its size is %ld",
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NEW_SIZE, TST_RET);
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}
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TST_ASSERT_INT(sys_loop_sizepath, NEW_SIZE/512);
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SAFE_CLOSE(file_fd);
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tst_detach_device_by_fd(dev_path, dev_fd);
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unlink("test.img");
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attach_flag = 0;
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}
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static void setup(void)
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{
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dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
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if (dev_num < 0)
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tst_brk(TBROK, "Failed to find free loop device");
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wrbuf = SAFE_MALLOC(OLD_SIZE);
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memset(wrbuf, 'x', OLD_SIZE);
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sprintf(sys_loop_sizepath, "/sys/block/loop%d/size", dev_num);
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dev_fd = SAFE_OPEN(dev_path, O_RDWR);
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}
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static void cleanup(void)
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{
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if (dev_fd > 0)
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SAFE_CLOSE(dev_fd);
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if (file_fd > 0)
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SAFE_CLOSE(file_fd);
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if (wrbuf)
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free(wrbuf);
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if (attach_flag)
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tst_detach_device(dev_path);
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}
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static struct tst_test test = {
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.setup = setup,
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.cleanup = cleanup,
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.test_all = verify_ioctl_loop,
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.needs_root = 1,
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.needs_tmpdir = 1,
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.needs_drivers = (const char *const []) {
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"loop",
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NULL
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}
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};
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