1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/* $NetBSD: t_union.c,v 1.9 2017/01/13 21:30:40 christos Exp $ */
#include <sys/types.h>
#include <sys/mount.h>
#include <atf-c.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <rump/rump.h>
#include <rump/rump_syscalls.h>
#include <miscfs/union/union.h>
#include "h_macros.h"
#include "../common/h_fsmacros.h"
#define MSTR "magic bus"
static void
xput_tfile(const char *mp, const char *path)
{
char pathb[MAXPATHLEN];
int fd;
strcpy(pathb, mp);
strcat(pathb, "/");
strcat(pathb, path);
RL(fd = rump_sys_open(pathb, O_CREAT | O_RDWR, 0777));
if (rump_sys_write(fd, MSTR, sizeof(MSTR)) != sizeof(MSTR))
atf_tc_fail_errno("write to testfile");
RL(rump_sys_close(fd));
}
static int
xread_tfile(const char *mp, const char *path)
{
char pathb[MAXPATHLEN];
char buf[128];
int fd;
strcpy(pathb, mp);
strcat(pathb, "/");
strcat(pathb, path);
fd = rump_sys_open(pathb, O_RDONLY);
if (fd == -1)
return errno;
if (rump_sys_read(fd, buf, sizeof(buf)) == -1)
atf_tc_fail_errno("read tfile");
RL(rump_sys_close(fd));
if (strcmp(buf, MSTR) == 0)
return 0;
return EPROGMISMATCH;
}
/*
* Mount a unionfs for testing. Before calling, "mp" contains
* the upper layer. Lowerpath is constructed so that the directory
* contains rumpfs.
*/
static void
mountunion(const char *mp, char *lowerpath)
{
struct union_args unionargs;
sprintf(lowerpath, "/lower");
rump_sys_mkdir(lowerpath, 0777);
/* mount the union with our testfs as the upper layer */
memset(&unionargs, 0, sizeof(unionargs));
unionargs.target = lowerpath;
unionargs.mntflags = UNMNT_BELOW;
if (rump_sys_mount(MOUNT_UNION, mp, 0,
&unionargs, sizeof(unionargs)) == -1) {
if (errno == EOPNOTSUPP) {
atf_tc_skip("fs does not support VOP_WHITEOUT");
} else {
atf_tc_fail_errno("union mount");
}
}
}
#if 0
static void
toggleroot(void)
{
static int status;
status ^= MNT_RDONLY;
printf("0x%x\n", status);
RL(rump_sys_mount(MOUNT_RUMPFS, "/", status | MNT_UPDATE, NULL, 0));
}
#endif
#define TFILE "tensti"
#define TDIR "testdir"
#define TDFILE TDIR "/indir"
static void
basic(const atf_tc_t *tc, const char *mp)
{
char lowerpath[MAXPATHLEN];
char dbuf[8192];
struct stat sb;
struct dirent *dp;
int error, fd, dsize;
mountunion(mp, lowerpath);
/* create a file in the lower layer */
xput_tfile(lowerpath, TFILE);
/* first, test we can read the old file from the new namespace */
error = xread_tfile(mp, TFILE);
if (error != 0)
atf_tc_fail("union compare failed: %d (%s)",
error, strerror(error));
/* then, test upper layer writes don't affect the lower layer */
xput_tfile(mp, "kiekko");
if ((error = xread_tfile(lowerpath, "kiekko")) != ENOENT)
atf_tc_fail("invisibility failed: %d (%s)",
error, strerror(error));
/* check that we can whiteout stuff in the upper layer */
FSTEST_ENTER();
RL(rump_sys_unlink(TFILE));
ATF_REQUIRE_ERRNO(ENOENT, rump_sys_stat(TFILE, &sb) == -1);
FSTEST_EXIT();
/* check that the removed node is not in the directory listing */
RL(fd = rump_sys_open(mp, O_RDONLY));
RL(dsize = rump_sys_getdents(fd, dbuf, sizeof(dbuf)));
for (dp = (struct dirent *)dbuf;
(char *)dp < dbuf + dsize;
dp = _DIRENT_NEXT(dp)) {
if (strcmp(dp->d_name, TFILE) == 0 && dp->d_type != DT_WHT)
atf_tc_fail("removed file non-white-outed");
}
RL(rump_sys_close(fd));
RL(rump_sys_unmount(mp, 0));
}
static void
whiteout(const atf_tc_t *tc, const char *mp)
{
char lower[MAXPATHLEN];
struct stat sb;
void *fsarg;
/*
* XXX: use ffs here to make sure any screwups in rumpfs don't
* affect the test
*/
RL(ffs_fstest_newfs(tc, &fsarg, "daimage", 1024*1024*5, NULL));
RL(ffs_fstest_mount(tc, fsarg, "/lower", 0));
/* create a file in the lower layer */
RL(rump_sys_chdir("/lower"));
RL(rump_sys_mkdir(TDIR, 0777));
RL(rump_sys_mkdir(TDFILE, 0777));
RL(rump_sys_chdir("/"));
RL(ffs_fstest_unmount(tc, "/lower", 0));
RL(ffs_fstest_mount(tc, fsarg, "/lower", MNT_RDONLY));
mountunion(mp, lower);
FSTEST_ENTER();
ATF_REQUIRE_ERRNO(ENOTEMPTY, rump_sys_rmdir(TDIR) == -1);
RL(rump_sys_rmdir(TDFILE));
RL(rump_sys_rmdir(TDIR));
ATF_REQUIRE_ERRNO(ENOENT, rump_sys_stat(TDFILE, &sb) == -1);
ATF_REQUIRE_ERRNO(ENOENT, rump_sys_stat(TDIR, &sb) == -1);
RL(rump_sys_mkdir(TDIR, 0777));
RL(rump_sys_stat(TDIR, &sb));
ATF_REQUIRE_ERRNO(ENOENT, rump_sys_stat(TDFILE, &sb) == -1);
FSTEST_EXIT();
RL(rump_sys_unmount(mp, 0));
}
ATF_TC_FSAPPLY(basic, "check basic union functionality");
ATF_TC_FSAPPLY(whiteout, "create whiteout in upper layer");
ATF_TP_ADD_TCS(tp)
{
ATF_TP_FSAPPLY(basic);
ATF_TP_FSAPPLY(whiteout);
return atf_no_error();
}
|
