diff options
Diffstat (limited to 'kernel/tests/testcases/kernel/syscalls/ioctl/ioctl_loop02.c')
| -rw-r--r-- | kernel/tests/testcases/kernel/syscalls/ioctl/ioctl_loop02.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/kernel/tests/testcases/kernel/syscalls/ioctl/ioctl_loop02.c b/kernel/tests/testcases/kernel/syscalls/ioctl/ioctl_loop02.c new file mode 100644 index 0000000..ac61842 --- /dev/null +++ b/kernel/tests/testcases/kernel/syscalls/ioctl/ioctl_loop02.c @@ -0,0 +1,164 @@ +// 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 + } +}; |