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
|
/*
* Copyright (C) 2014, Parallels, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <getopt.h>
static int usage(int rc)
{
FILE *out = (rc == 0)? stdout : stderr;
fprintf(out,
"Usage: vzfsync {-s|-d} [-n] file [file ...]\n"
" -s, --sync do fsync()\n"
" -d, --datasync do fdatasync()\n"
" -n, --dontneed do fadvise(DONTNEED)\n"
);
return rc;
}
int main(int argc, char *argv[])
{
int i;
int fails = 0;
int sync = 0, datasync = 0, dontneed = 0;
struct option longopt[] = {
{ "help", no_argument, 0, 'h' },
{ "sync", no_argument, 0, 's' },
{ "datasync", no_argument, 0, 'd' },
{ "dontneed", no_argument, 0, 'n' },
{}
};
while ((i = getopt_long(argc, argv, "hsdn", longopt, NULL)) != EOF) {
switch (i) {
case 'h':
return usage(0);
break;
case 's':
sync = 1;
break;
case 'd':
datasync = 1;
break;
case 'n':
dontneed = 1;
break;
default:
return usage(1);
}
}
argc -= optind;
argv += optind;
if (argc < 1)
return usage(0);
if (sync == 1 && datasync == 1) {
fprintf(stderr, "Options -s and -d can't be used together\n");
return usage(1);
}
if (sync == 0 && datasync == 0 && dontneed == 0) {
fprintf(stderr, "No options given\n");
return usage(1);
}
/* Process files one by one */
for (; argc > 0; argc--, argv++) {
const char *name = argv[0];
int fd;
fd = open(name, O_RDONLY|O_DIRECT);
if (fd < 0) {
fprintf(stderr, "Can't open %s: %m\n", name);
fails++;
continue;
}
if (sync && fsync(fd) < 0) {
fprintf(stderr, "Error fsync(%s): %m\n", name);
fails++;
}
if (datasync && fdatasync(fd) < 0) {
fprintf(stderr, "Error fdatasync(%s): %m\n", name);
fails++;
}
if (dontneed && posix_fadvise(fd, 0, 0,
POSIX_FADV_DONTNEED) < 0) {
fprintf(stderr, "Error fadvise(%s): %m\n", name);
fails++;
}
if (close(fd) < 0) {
fprintf(stderr, "Error close(%s): %m\n", name);
fails++;
}
}
return (fails == 0) ? 0 : 2;
}
|
