1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
4 * Author: Yang Xu <xuyang2018.jy@cn.jujitsu.com>
5 *
6 * This is a basic ioctl test about loopdevice.
7 * It is designed to test LO_FLAGS_AUTOCLEAR and LO_FLAGS_PARTSCAN flag.
8 *
9 * For LO_FLAGS_AUTOCLEAR flag, we only check autoclear field value in sys
10 * directory and also get lo_flags by using LOOP_GET_STATUS.
11 *
12 * For LO_FLAGS_PARTSCAN flag, it is the same as LO_FLAGS_AUTOCLEAR flag.
13 * But we also check whether we can scan partition table correctly ie check
14 * whether /dev/loopnp1 and /sys/bloclk/loop0/loop0p1 existed.
15 *
16 * For LO_FLAGS_AUTOCLEAR flag, it can be clear. For LO_FLAGS_PARTSCAN flag,
17 * it cannot be clear. We also check this.
18 *
19 * It is also a regression test for kernel
20 * commit 10c70d95c0f2 ("block: remove the bd_openers checks in blk_drop_partitions")
21 * commit 6ac92fb5cdff ("loop: Fix wrong masking of status flags").
22 */
23
24 #include <stdio.h>
25 #include <unistd.h>
26 #include <string.h>
27 #include "lapi/loop.h"
28 #include "tst_test.h"
29
30 static char dev_path[1024], backing_path[1024], backing_file_path[1024];
31 static int dev_num, attach_flag, dev_fd, parted_sup;
32
33 /*
34 * In drivers/block/loop.c code, set status function doesn't handle
35 * LO_FLAGS_READ_ONLY flag and ingore it. Only loop_set_fd with read only mode
36 * file_fd, lo_flags will include LO_FLAGS_READ_ONLY and it's the same for
37 * LO_FLAGS_DIRECT_IO.
38 */
39 #define SET_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN | LO_FLAGS_READ_ONLY | LO_FLAGS_DIRECT_IO)
40 #define GET_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN)
41
42 static char partscan_path[1024], autoclear_path[1024];
43 static char loop_partpath[1026], sys_loop_partpath[1026];
44
check_loop_value(int set_flag,int get_flag,int autoclear_field)45 static void check_loop_value(int set_flag, int get_flag, int autoclear_field)
46 {
47 struct loop_info loopinfo = {0}, loopinfoget = {0};
48 int ret;
49
50 loopinfo.lo_flags = set_flag;
51 SAFE_IOCTL(dev_fd, LOOP_SET_STATUS, &loopinfo);
52 SAFE_IOCTL(dev_fd, LOOP_GET_STATUS, &loopinfoget);
53
54 if (loopinfoget.lo_flags & ~get_flag)
55 tst_res(TFAIL, "expect %d but got %d", get_flag, loopinfoget.lo_flags);
56 else
57 tst_res(TPASS, "get expected lo_flag %d", loopinfoget.lo_flags);
58
59 TST_ASSERT_INT(partscan_path, 1);
60 TST_ASSERT_INT(autoclear_path, autoclear_field);
61
62 if (!parted_sup) {
63 tst_res(TINFO, "Current environment doesn't have parted disk, skip it");
64 return;
65 }
66
67 ret = TST_RETRY_FN_EXP_BACKOFF(access(loop_partpath, F_OK), TST_RETVAL_EQ0, 30);
68 if (ret == 0)
69 tst_res(TPASS, "access %s succeeds", loop_partpath);
70 else
71 tst_res(TFAIL, "access %s fails", loop_partpath);
72
73 ret = TST_RETRY_FN_EXP_BACKOFF(access(sys_loop_partpath, F_OK), TST_RETVAL_EQ0, 30);
74 if (ret == 0)
75 tst_res(TPASS, "access %s succeeds", sys_loop_partpath);
76 else
77 tst_res(TFAIL, "access %s fails", sys_loop_partpath);
78 }
79
verify_ioctl_loop(void)80 static void verify_ioctl_loop(void)
81 {
82 tst_attach_device(dev_path, "test.img");
83 attach_flag = 1;
84
85 TST_ASSERT_INT(partscan_path, 0);
86 TST_ASSERT_INT(autoclear_path, 0);
87 TST_ASSERT_STR(backing_path, backing_file_path);
88
89 check_loop_value(SET_FLAGS, GET_FLAGS, 1);
90
91 tst_res(TINFO, "Test flag can be clear");
92 check_loop_value(0, LO_FLAGS_PARTSCAN, 0);
93
94 tst_detach_device_by_fd(dev_path, dev_fd);
95 attach_flag = 0;
96 }
97
setup(void)98 static void setup(void)
99 {
100 int ret;
101 const char *const cmd_parted[] = {"parted", "-s", "test.img", "mklabel", "msdos", "mkpart",
102 "primary", "ext4", "1M", "10M", NULL};
103
104 dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
105 if (dev_num < 0)
106 tst_brk(TBROK, "Failed to find free loop device");
107
108 tst_fill_file("test.img", 0, 1024 * 1024, 10);
109
110 ret = tst_cmd(cmd_parted, NULL, NULL, TST_CMD_PASS_RETVAL);
111 switch (ret) {
112 case 0:
113 parted_sup = 1;
114 break;
115 case 255:
116 tst_res(TCONF, "parted binary not installed or failed");
117 break;
118 default:
119 tst_res(TCONF, "parted exited with %i", ret);
120 break;
121 }
122
123 sprintf(partscan_path, "/sys/block/loop%d/loop/partscan", dev_num);
124 sprintf(autoclear_path, "/sys/block/loop%d/loop/autoclear", dev_num);
125 sprintf(backing_path, "/sys/block/loop%d/loop/backing_file", dev_num);
126 sprintf(sys_loop_partpath, "/sys/block/loop%d/loop%dp1", dev_num, dev_num);
127 sprintf(backing_file_path, "%s/test.img", tst_get_tmpdir());
128 sprintf(loop_partpath, "%sp1", dev_path);
129 dev_fd = SAFE_OPEN(dev_path, O_RDWR);
130 }
131
cleanup(void)132 static void cleanup(void)
133 {
134 if (dev_fd > 0)
135 SAFE_CLOSE(dev_fd);
136 if (attach_flag)
137 tst_detach_device(dev_path);
138 }
139
140 static struct tst_test test = {
141 .setup = setup,
142 .cleanup = cleanup,
143 .test_all = verify_ioctl_loop,
144 .needs_root = 1,
145 .needs_drivers = (const char *const []) {
146 "loop",
147 NULL
148 },
149 .tags = (const struct tst_tag[]) {
150 {"linux-git", "10c70d95c0f2"},
151 {"linux-git", "6ac92fb5cdff"},
152 {}
153 },
154 .needs_tmpdir = 1,
155 };
156