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
|
/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
#include <nbdkit-filter.h>
#ifdef HAVE_STDATOMIC_H
#include <stdatomic.h>
#else
/* Only used for counting statistics. */
#define _Atomic /**/
#endif
static _Atomic uint64_t bytes_read, bytes_written, bytes_zeroed, bytes_trimmed;
static void
count_unload (void)
{
nbdkit_debug ("count bytes: "
"read %" PRIu64 ", "
"written %" PRIu64 ", "
"zeroed %" PRIu64 ", "
"trimmed %" PRIu64,
bytes_read, bytes_written, bytes_zeroed, bytes_trimmed);
}
/* Read data. */
static int
count_pread (nbdkit_next *next,
void *handle,
void *buf,
uint32_t count, uint64_t offset, uint32_t flags,
int *err)
{
int r;
r = next->pread (next, buf, count, offset, flags, err);
if (r >= 0)
bytes_read += count;
return r;
}
/* Write data. */
static int
count_pwrite (nbdkit_next *next,
void *handle,
const void *buf,
uint32_t count, uint64_t offset, uint32_t flags,
int *err)
{
int r;
r = next->pwrite (next, buf, count, offset, flags, err);
if (r >= 0)
bytes_written += count;
return r;
}
/* Trim data. */
static int
count_trim (nbdkit_next *next,
void *handle, uint32_t count, uint64_t offset, uint32_t flags,
int *err)
{
int r;
r = next->trim (next, count, offset, flags, err);
if (r >= 0)
bytes_trimmed += count;
return r;
}
/* Zero data. */
static int
count_zero (nbdkit_next *next,
void *handle, uint32_t count, uint64_t offset, uint32_t flags,
int *err)
{
int r;
r = next->zero (next, count, offset, flags, err);
if (r >= 0)
bytes_zeroed += count;
return r;
}
static struct nbdkit_filter filter = {
.name = "count",
.longname = "nbdkit count filter",
.unload = count_unload,
.pread = count_pread,
.pwrite = count_pwrite,
.trim = count_trim,
.zero = count_zero,
};
NBDKIT_REGISTER_FILTER (filter)
|
