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
|
#include "../common/io.c"
#include "../common/tdb.c"
#include "../common/lock.c"
#include "../common/freelist.c"
#include "../common/traverse.c"
#include "../common/transaction.c"
#include "../common/error.c"
#include "../common/open.c"
#include "../common/check.c"
#include "../common/hash.c"
#include "../common/mutex.c"
#include "tap-interface.h"
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdarg.h>
#include "logging.h"
static TDB_DATA key, data;
static void do_chainlock(const char *name, int tdb_flags, int up, int down)
{
struct tdb_context *tdb;
int ret;
ssize_t nread, nwritten;
char c = 0;
tdb = tdb_open_ex(name, 3, tdb_flags,
O_RDWR|O_CREAT, 0755, &taplogctx, NULL);
ok(tdb, "tdb_open_ex should succeed");
ret = tdb_chainlock_read(tdb, key);
ok(ret == 0, "tdb_chainlock_read should succeed");
nwritten = write(up, &c, sizeof(c));
ok(nwritten == sizeof(c), "write should succeed");
nread = read(down, &c, sizeof(c));
ok(nread == 0, "read should succeed");
exit(0);
}
static void do_trylock(const char *name, int tdb_flags, int up, int down)
{
struct tdb_context *tdb;
int ret;
ssize_t nread, nwritten;
char c = 0;
tdb = tdb_open_ex(name, 3, tdb_flags,
O_RDWR|O_CREAT, 0755, &taplogctx, NULL);
ok(tdb, "tdb_open_ex should succeed");
/*
* tdb used to have a bug where with fcntl locks an upgrade
* from a readlock to writelock did not check for the
* underlying fcntl lock. Mutexes don't distinguish between
* readlocks and writelocks, so that bug does not apply here.
*/
ret = tdb_chainlock_read(tdb, key);
ok(ret == 0, "tdb_chainlock_read should succeed");
ret = tdb_chainlock_nonblock(tdb, key);
ok(ret == -1, "tdb_chainlock_nonblock should fail");
nwritten = write(up, &c, sizeof(c));
ok(nwritten == sizeof(c), "write should succeed");
nread = read(down, &c, sizeof(c));
ok(nread == 0, "read should succeed");
exit(0);
}
static int do_tests(const char *name, int tdb_flags)
{
int ret;
pid_t chainlock_child, store_child;
int chainlock_down[2];
int chainlock_up[2];
int store_down[2];
int store_up[2];
char c;
ssize_t nread;
key.dsize = strlen("hi");
key.dptr = discard_const_p(uint8_t, "hi");
data.dsize = strlen("world");
data.dptr = discard_const_p(uint8_t, "world");
ret = pipe(chainlock_down);
ok(ret == 0, "pipe should succeed");
ret = pipe(chainlock_up);
ok(ret == 0, "pipe should succeed");
ret = pipe(store_down);
ok(ret == 0, "pipe should succeed");
ret = pipe(store_up);
ok(ret == 0, "pipe should succeed");
chainlock_child = fork();
ok(chainlock_child != -1, "fork should succeed");
if (chainlock_child == 0) {
close(chainlock_up[0]);
close(chainlock_down[1]);
close(store_up[0]);
close(store_up[1]);
close(store_down[0]);
close(store_down[1]);
do_chainlock(name, tdb_flags,
chainlock_up[1], chainlock_down[0]);
exit(0);
}
close(chainlock_up[1]);
close(chainlock_down[0]);
nread = read(chainlock_up[0], &c, sizeof(c));
ok(nread == sizeof(c), "read should succeed");
/*
* Now we have a process holding a chain read lock. Start
* another process trying to write lock. This should fail.
*/
store_child = fork();
ok(store_child != -1, "fork should succeed");
if (store_child == 0) {
close(chainlock_up[0]);
close(chainlock_down[1]);
close(store_up[0]);
close(store_down[1]);
do_trylock(name, tdb_flags,
store_up[1], store_down[0]);
exit(0);
}
close(store_up[1]);
close(store_down[0]);
nread = read(store_up[0], &c, sizeof(c));
ok(nread == sizeof(c), "read should succeed");
close(chainlock_up[0]);
close(chainlock_down[1]);
close(store_up[0]);
close(store_down[1]);
diag("%s tests done", name);
return exit_status();
}
int main(int argc, char *argv[])
{
int ret;
ret = do_tests("rdlock-upgrade.tdb",
TDB_CLEAR_IF_FIRST |
TDB_INCOMPATIBLE_HASH);
ok(ret == 0, "rdlock-upgrade.tdb tests should succeed");
return exit_status();
}
|
