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
|
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/xattr.h>
#include <errno.h>
#include "bit-rot-object-version.h"
/* NOTE: no size discovery */
int
brstub_validate_version(char *bpath, unsigned long version)
{
int ret = 0;
int match = 0;
size_t xsize = 0;
br_version_t *xv = NULL;
xsize = sizeof(br_version_t);
xv = calloc(1, xsize);
if (!xv) {
match = -1;
goto err;
}
ret = getxattr(bpath, "trusted.bit-rot.version", xv, xsize);
if (ret < 0) {
if (errno == ENODATA)
match = -2;
goto err;
}
if (xv->ongoingversion != version) {
match = -3;
fprintf(stderr, "ongoingversion: %lu\n", xv->ongoingversion);
}
free(xv);
err:
return match;
}
int
brstub_write_validation(char *filp, char *bpath, unsigned long startversion)
{
int fd1 = 0;
int fd2 = 0;
int ret = 0;
char *string = "string\n";
/* read only check */
fd1 = open(filp, O_RDONLY);
if (fd1 < 0)
goto err;
close(fd1);
ret = brstub_validate_version(bpath, startversion);
if (ret != -2)
goto err;
/* single open (write/) check */
fd1 = open(filp, O_RDWR);
if (fd1 < 0)
goto err;
ret = write(fd1, string, strlen(string));
if (ret <= 0)
goto err;
/**
* Fsync is done so that the write call has properly reached the
* disk. For fuse mounts write-behind xlator would have held the
* writes with itself and for nfs, client would have held the
* write in its cache. So write fop would not have triggered the
* versioning as it would have not reached the bit-rot-stub.
*/
fsync(fd1);
ret = brstub_validate_version(bpath, startversion);
if (ret != 0)
goto err;
ret = write(fd1, string, strlen(string));
if (ret <= 0)
goto err;
fsync(fd1); /* let it reach the disk */
ret = brstub_validate_version(bpath, startversion);
if (ret != 0)
goto err;
close(fd1);
/**
* Well, this is not a _real_ test per se . For this test to pass
* the inode should not get a forget() in the interim. Therefore,
* perform this test asap.
*/
/* multi open (write/) check */
fd1 = open(filp, O_RDWR);
if (fd1 < 0)
goto err;
fd2 = open(filp, O_WRONLY);
if (fd1 < 0)
goto err;
ret = write(fd1, string, strlen(string));
if (ret <= 0)
goto err;
ret = write(fd2, string, strlen(string));
if (ret <= 0)
goto err;
/* probably do a syncfs() */
fsync(fd1);
fsync(fd2);
close(fd1);
close(fd2);
/**
* incremented once per write()/write().../close()/close() sequence
*/
ret = brstub_validate_version(bpath, startversion);
if (ret != 0)
goto err;
return 0;
err:
return -1;
}
int
brstub_new_object_validate(char *filp, char *brick)
{
int ret = 0;
char *fname = NULL;
char bpath[PATH_MAX] = {
0,
};
fname = basename(filp);
if (!fname)
goto err;
(void)snprintf(bpath, PATH_MAX, "%s/%s", brick, fname);
printf("Validating initial version..\n");
ret = brstub_validate_version(bpath, 2);
if (ret != -2) /* version _should_ be missing */
goto err;
printf("Validating version on modifications..\n");
ret = brstub_write_validation(filp, bpath, 2);
if (ret < 0)
goto err;
return 0;
err:
return -1;
}
int
main(int argc, char **argv)
{
int ret = 0;
char *filp = NULL;
char *brick = NULL;
if (argc != 3) {
printf("Usage: %s <path> <brick>\n", argv[0]);
goto err;
}
filp = argv[1];
brick = argv[2];
printf("Validating object version [%s]\n", filp);
ret = brstub_new_object_validate(filp, brick);
if (ret < 0)
goto err;
return 0;
err:
return -1;
}
|
