1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
4 * Copyright (c) Linux Test Project, 2020-2022
5 * Author: Yang Xu <xuyang2018.jy@cn.jujitsu.com>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Tests ioctl() on loopdevice with LO_FLAGS_AUTOCLEAR and LO_FLAGS_PARTSCAN flags.
12 *
13 * For LO_FLAGS_AUTOCLEAR flag, only checks autoclear field value in sysfs
14 * and also gets lo_flags by using LOOP_GET_STATUS.
15 *
16 * For LO_FLAGS_PARTSCAN flag, it is the same as LO_FLAGS_AUTOCLEAR flag.
17 * But also checks whether it can scan partition table correctly i.e. checks
18 * whether /dev/loopnp1 and /sys/bloclk/loop0/loop0p1 existed.
19 *
20 * For LO_FLAGS_AUTOCLEAR flag, it can be clear. For LO_FLAGS_PARTSCAN flag,
21 * it cannot be clear. Test checks this.
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];
31 static char *backing_file_path;
32 static int dev_num, attach_flag, dev_fd, parted_sup;
33
34 /*
35 * In drivers/block/loop.c code, set status function doesn't handle
36 * LO_FLAGS_READ_ONLY flag and ingore it. Only loop_set_fd with read only mode
37 * file_fd, lo_flags will include LO_FLAGS_READ_ONLY and it's the same for
38 * LO_FLAGS_DIRECT_IO.
39 */
40 #define SET_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN | LO_FLAGS_READ_ONLY | LO_FLAGS_DIRECT_IO)
41 #define GET_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN)
42
43 static char partscan_path[1024], autoclear_path[1024];
44 static char loop_partpath[1026], sys_loop_partpath[1026];
45
check_loop_value(int set_flag,int get_flag,int autoclear_field)46 static void check_loop_value(int set_flag, int get_flag, int autoclear_field)
47 {
48 struct loop_info loopinfo = {0}, loopinfoget = {0};
49 int ret;
50
51 loopinfo.lo_flags = set_flag;
52 SAFE_IOCTL(dev_fd, LOOP_SET_STATUS, &loopinfo);
53 SAFE_IOCTL(dev_fd, LOOP_GET_STATUS, &loopinfoget);
54
55 if (loopinfoget.lo_flags & ~get_flag)
56 tst_res(TFAIL, "expect %d but got %d", get_flag, loopinfoget.lo_flags);
57 else
58 tst_res(TPASS, "get expected lo_flag %d", loopinfoget.lo_flags);
59
60 TST_ASSERT_INT(partscan_path, 1);
61 TST_ASSERT_INT(autoclear_path, autoclear_field);
62
63 if (!parted_sup) {
64 tst_res(TINFO, "Current environment doesn't have parted disk, skip it");
65 return;
66 }
67
68 ret = TST_RETRY_FN_EXP_BACKOFF(access(loop_partpath, F_OK), TST_RETVAL_EQ0, 30);
69 if (ret == 0)
70 tst_res(TPASS, "access %s succeeds", loop_partpath);
71 else
72 tst_res(TFAIL, "access %s fails", loop_partpath);
73
74 ret = TST_RETRY_FN_EXP_BACKOFF(access(sys_loop_partpath, F_OK), TST_RETVAL_EQ0, 30);
75 if (ret == 0)
76 tst_res(TPASS, "access %s succeeds", sys_loop_partpath);
77 else
78 tst_res(TFAIL, "access %s fails", sys_loop_partpath);
79 }
80
verify_ioctl_loop(void)81 static void verify_ioctl_loop(void)
82 {
83 tst_attach_device(dev_path, "test.img");
84 attach_flag = 1;
85
86 TST_ASSERT_INT(partscan_path, 0);
87 TST_ASSERT_INT(autoclear_path, 0);
88 TST_ASSERT_STR(backing_path, backing_file_path);
89
90 check_loop_value(SET_FLAGS, GET_FLAGS, 1);
91
92 tst_res(TINFO, "Test flag can be clear");
93 check_loop_value(0, LO_FLAGS_PARTSCAN, 0);
94
95 tst_detach_device_by_fd(dev_path, dev_fd);
96 dev_fd = SAFE_OPEN(dev_path, O_RDWR);
97 attach_flag = 0;
98 }
99
setup(void)100 static void setup(void)
101 {
102 int ret;
103 const char *const cmd_parted[] = {"parted", "-s", "test.img", "mklabel", "msdos", "mkpart",
104 "primary", "ext4", "1M", "10M", NULL};
105
106 dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
107 if (dev_num < 0)
108 tst_brk(TBROK, "Failed to find free loop device");
109
110 tst_fill_file("test.img", 0, 1024 * 1024, 10);
111
112 ret = tst_cmd(cmd_parted, NULL, NULL, TST_CMD_PASS_RETVAL);
113 switch (ret) {
114 case 0:
115 parted_sup = 1;
116 break;
117 case 255:
118 tst_res(TCONF, "parted binary not installed or failed");
119 break;
120 default:
121 tst_res(TCONF, "parted exited with %i", ret);
122 break;
123 }
124
125 sprintf(partscan_path, "/sys/block/loop%d/loop/partscan", dev_num);
126 sprintf(autoclear_path, "/sys/block/loop%d/loop/autoclear", dev_num);
127 sprintf(backing_path, "/sys/block/loop%d/loop/backing_file", dev_num);
128 sprintf(sys_loop_partpath, "/sys/block/loop%d/loop%dp1", dev_num, dev_num);
129 backing_file_path = tst_tmpdir_genpath("test.img");
130 sprintf(loop_partpath, "%sp1", dev_path);
131 dev_fd = SAFE_OPEN(dev_path, O_RDWR);
132 }
133
cleanup(void)134 static void cleanup(void)
135 {
136 if (dev_fd > 0)
137 SAFE_CLOSE(dev_fd);
138 if (attach_flag)
139 tst_detach_device(dev_path);
140 }
141
142 static struct tst_test test = {
143 .timeout = 1,
144 .setup = setup,
145 .cleanup = cleanup,
146 .test_all = verify_ioctl_loop,
147 .needs_root = 1,
148 .needs_drivers = (const char *const []) {
149 "loop",
150 NULL
151 },
152 .tags = (const struct tst_tag[]) {
153 {"linux-git", "10c70d95c0f2"},
154 {"linux-git", "6ac92fb5cdff"},
155 {}
156 },
157 .needs_tmpdir = 1,
158 };
159