// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved. * Author: Yang Xu * * This is a basic ioctl test about loopdevice. * It is designed to test LO_FLAGS_AUTOCLEAR and LO_FLAGS_PARTSCAN flag. * * For LO_FLAGS_AUTOCLEAR flag, we only check autoclear field value in sys * directory and also get lo_flags by using LOOP_GET_STATUS. * * For LO_FLAGS_PARTSCAN flag, it is the same as LO_FLAGS_AUTOCLEAR flag. * But we also check whether we can scan partition table correctly ie check * whether /dev/loopnp1 and /sys/bloclk/loop0/loop0p1 existed. * * For LO_FLAGS_AUTOCLEAR flag, it can be clear. For LO_FLAGS_PARTSCAN flag, * it cannot be clear. We also check this. * * It is also a regression test for kernel * commit 10c70d95c0f2 ("block: remove the bd_openers checks in blk_drop_partitions") * commit 6ac92fb5cdff ("loop: Fix wrong masking of status flags"). */ #include #include #include #include "lapi/loop.h" #include "tst_test.h" static char dev_path[1024], backing_path[1024], backing_file_path[1024]; static int dev_num, attach_flag, dev_fd, parted_sup; /* * In drivers/block/loop.c code, set status function doesn't handle * LO_FLAGS_READ_ONLY flag and ingore it. Only loop_set_fd with read only mode * file_fd, lo_flags will include LO_FLAGS_READ_ONLY and it's the same for * LO_FLAGS_DIRECT_IO. */ #define SET_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN | LO_FLAGS_READ_ONLY | LO_FLAGS_DIRECT_IO) #define GET_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN) static char partscan_path[1024], autoclear_path[1024]; static char loop_partpath[1026], sys_loop_partpath[1026]; static void check_loop_value(int set_flag, int get_flag, int autoclear_field) { struct loop_info loopinfo = {0}, loopinfoget = {0}; int ret; loopinfo.lo_flags = set_flag; SAFE_IOCTL(dev_fd, LOOP_SET_STATUS, &loopinfo); SAFE_IOCTL(dev_fd, LOOP_GET_STATUS, &loopinfoget); if (loopinfoget.lo_flags & ~get_flag) tst_res(TFAIL, "expect %d but got %d", get_flag, loopinfoget.lo_flags); else tst_res(TPASS, "get expected lo_flag %d", loopinfoget.lo_flags); TST_ASSERT_INT(partscan_path, 1); TST_ASSERT_INT(autoclear_path, autoclear_field); if (!parted_sup) { tst_res(TINFO, "Current environment doesn't have parted disk, skip it"); return; } ret = TST_RETRY_FN_EXP_BACKOFF(access(loop_partpath, F_OK), TST_RETVAL_EQ0, 30); if (ret == 0) tst_res(TPASS, "access %s succeeds", loop_partpath); else tst_res(TFAIL, "access %s fails", loop_partpath); ret = TST_RETRY_FN_EXP_BACKOFF(access(sys_loop_partpath, F_OK), TST_RETVAL_EQ0, 30); if (ret == 0) tst_res(TPASS, "access %s succeeds", sys_loop_partpath); else tst_res(TFAIL, "access %s fails", sys_loop_partpath); } static void verify_ioctl_loop(void) { tst_attach_device(dev_path, "test.img"); attach_flag = 1; TST_ASSERT_INT(partscan_path, 0); TST_ASSERT_INT(autoclear_path, 0); TST_ASSERT_STR(backing_path, backing_file_path); check_loop_value(SET_FLAGS, GET_FLAGS, 1); tst_res(TINFO, "Test flag can be clear"); check_loop_value(0, LO_FLAGS_PARTSCAN, 0); tst_detach_device_by_fd(dev_path, dev_fd); attach_flag = 0; } static void setup(void) { int ret; const char *const cmd_parted[] = {"parted", "-s", "test.img", "mklabel", "msdos", "mkpart", "primary", "ext4", "1M", "10M", NULL}; 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 * 1024, 10); ret = tst_cmd(cmd_parted, NULL, NULL, TST_CMD_PASS_RETVAL); switch (ret) { case 0: parted_sup = 1; break; case 255: tst_res(TCONF, "parted binary not installed or failed"); break; default: tst_res(TCONF, "parted exited with %i", ret); break; } sprintf(partscan_path, "/sys/block/loop%d/loop/partscan", dev_num); sprintf(autoclear_path, "/sys/block/loop%d/loop/autoclear", dev_num); sprintf(backing_path, "/sys/block/loop%d/loop/backing_file", dev_num); sprintf(sys_loop_partpath, "/sys/block/loop%d/loop%dp1", dev_num, dev_num); sprintf(backing_file_path, "%s/test.img", tst_get_tmpdir()); sprintf(loop_partpath, "%sp1", dev_path); dev_fd = SAFE_OPEN(dev_path, O_RDWR); } static void cleanup(void) { if (dev_fd > 0) SAFE_CLOSE(dev_fd); 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_drivers = (const char *const []) { "loop", NULL }, .tags = (const struct tst_tag[]) { {"linux-git", "10c70d95c0f2"}, {"linux-git", "6ac92fb5cdff"}, {} }, .needs_tmpdir = 1, };