1 /*        $NetBSD: t_basic.c,v 1.6 2024/07/28 12:55:59 bad Exp $      */
2 
3 #include <sys/types.h>
4 #include <sys/mount.h>
5 
6 #include <atf-c.h>
7 #include <err.h>
8 #include <errno.h>
9 #include <fcntl.h>
10 #include <stdio.h>
11 #include <unistd.h>
12 #include <string.h>
13 #include <stdlib.h>
14 
15 #include <rump/rump.h>
16 #include <rump/rump_syscalls.h>
17 
18 #include <miscfs/nullfs/null.h>
19 #include <fs/tmpfs/tmpfs_args.h>
20 
21 #include "h_macros.h"
22 
23 ATF_TC(basic);
ATF_TC_HEAD(basic,tc)24 ATF_TC_HEAD(basic, tc)
25 {
26           atf_tc_set_md_var(tc, "descr", "basic nullfs functionality");
27 }
28 
29 #define MSTR "magic bus"
30 
31 static void
xput_tfile(const char * path,const char * mstr)32 xput_tfile(const char *path, const char *mstr)
33 {
34           int fd;
35 
36           fd = rump_sys_open(path, O_CREAT | O_RDWR, 0777);
37           if (fd == -1)
38                     atf_tc_fail_errno("create %s", path);
39           if (rump_sys_write(fd, MSTR, sizeof(MSTR)) != sizeof(MSTR))
40                     atf_tc_fail_errno("write to testfile");
41           rump_sys_close(fd);
42 }
43 
44 static int
xread_tfile(const char * path,const char * mstr)45 xread_tfile(const char *path, const char *mstr)
46 {
47           char buf[128];
48           int fd;
49 
50           fd = rump_sys_open(path, O_RDONLY);
51           if (fd == -1)
52                     return errno;
53           if (rump_sys_read(fd, buf, sizeof(buf)) == -1)
54                     atf_tc_fail_errno("read tfile");
55           rump_sys_close(fd);
56           if (strcmp(buf, MSTR) == 0)
57                     return 0;
58           return EPROGMISMATCH;
59 }
60 
61 static void
mountnull(const char * what,const char * mp,int flags)62 mountnull(const char *what, const char *mp, int flags)
63 {
64           struct null_args nargs;
65 
66           memset(&nargs, 0, sizeof(nargs));
67           nargs.nulla_target = __UNCONST(what);
68           if (rump_sys_mount(MOUNT_NULL, mp, flags, &nargs, sizeof(nargs)) == -1)
69                     atf_tc_fail_errno("could not mount nullfs");
70 
71 }
72 
ATF_TC_BODY(basic,tc)73 ATF_TC_BODY(basic, tc)
74 {
75           struct tmpfs_args targs;
76           struct stat sb;
77           int error;
78 
79           rump_init();
80           if (rump_sys_mkdir("/td1", 0777) == -1)
81                     atf_tc_fail_errno("mkdir /td1");
82           if (rump_sys_mkdir("/td2", 0777) == -1)
83                     atf_tc_fail_errno("mkdir /td2");
84 
85           /* use tmpfs because rumpfs doesn't support regular files */
86           memset(&targs, 0, sizeof(targs));
87           targs.ta_version = TMPFS_ARGS_VERSION;
88           targs.ta_root_mode = 0777;
89           if (rump_sys_mount(MOUNT_TMPFS, "/td1", 0, &targs, sizeof(targs)) == -1)
90                     atf_tc_fail_errno("could not mount tmpfs td1");
91 
92           mountnull("/td1", "/td2", 0);
93 
94           /* test unnull -> null */
95           xput_tfile("/td1/tensti", "jeppe");
96           error = xread_tfile("/td2/tensti", "jeppe");
97           if (error != 0)
98                     atf_tc_fail("null compare failed: %d (%s)",
99                         error, strerror(error));
100 
101           /* test null -> unnull */
102           xput_tfile("/td2/kiekko", "keppi");
103           error = xread_tfile("/td1/kiekko", "keppi");
104           if (error != 0)
105                     atf_tc_fail("unnull compare failed: %d (%s)",
106                         error, strerror(error));
107 
108           /* test unnull -> null overwrite */
109           xput_tfile("/td1/tensti", "se oolannin sota");
110           error = xread_tfile("/td2/tensti", "se oolannin sota");
111           if (error != 0)
112                     atf_tc_fail("unnull compare failed: %d (%s)",
113                         error, strerror(error));
114 
115           /* test that /td2 is unaffected in "real life" */
116           if (rump_sys_unmount("/td2", 0) == -1)
117                     atf_tc_fail_errno("cannot unmount nullfs");
118           if ((error = rump_sys_stat("/td2/tensti", &sb)) != -1
119               || errno != ENOENT) {
120                     atf_tc_fail("stat tensti should return ENOENT, got %d", error);
121           }
122           if ((error = rump_sys_stat("/td2/kiekko", &sb)) != -1
123               || errno != ENOENT) {
124                     atf_tc_fail("stat kiekko should return ENOENT, got %d", error);
125           }
126 
127           /* done */
128 }
129 
130 ATF_TC(twistymount);
ATF_TC_HEAD(twistymount,tc)131 ATF_TC_HEAD(twistymount, tc)
132 {
133 
134           /* this is expected to fail until the PR is fixed */
135           atf_tc_set_md_var(tc, "descr", "\"recursive\" mounts deadlock"
136               " (PR kern/43439)");
137 }
138 
139 /*
140  * Mapping to identifiers in PR kern/43439:
141  *  /td             = /home/current/pkgsrc
142  *  /td/dist        = /home/current/pkgsrc/distiles
143  *  /mp             = /usr/pkgsrc
144  *  /mp/dist        = /usr/pkgsrc/distfiles -- "created" by first null mount
145  */
146 
ATF_TC_BODY(twistymount,tc)147 ATF_TC_BODY(twistymount, tc)
148 {
149           rump_init();
150 
151           if (rump_sys_mkdir("/td", 0777) == -1)
152                     atf_tc_fail_errno("mkdir /td");
153           if (rump_sys_mkdir("/td/dist", 0777) == -1)
154                     atf_tc_fail_errno("mkdir /td/dist");
155           if (rump_sys_mkdir("/mp", 0777) == -1)
156                     atf_tc_fail_errno("mkdir /mp");
157 
158           /* MNT_RDONLY doesn't matter, but just for compat with the PR */
159           mountnull("/td", "/mp", MNT_RDONLY);
160           mountnull("/td/dist", "/mp/dist", 0);
161 
162           /* if we didn't get a locking-against-meself panic, we passed */
163 }
164 
ATF_TP_ADD_TCS(tp)165 ATF_TP_ADD_TCS(tp)
166 {
167 
168           ATF_TP_ADD_TC(tp, basic);
169           ATF_TP_ADD_TC(tp, twistymount);
170 
171           return atf_no_error();
172 }
173