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
|
/*
* Copyright (C) 2010 Advanced Micro Devices
* Author Christoph Egger <Christoph.Egger@amd.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; version 2.1 only.
*
* 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 Lesser General Public License for more details.
*/
#include "libxl_osdeps.h" /* must come before any other headers */
#include "libxl_internal.h"
#include "tap-ctl.h"
int libxl__blktap_enabled(libxl__gc *gc)
{
const char *msg;
return !tap_ctl_check(&msg);
}
char *libxl__blktap_devpath(libxl__gc *gc,
const char *disk,
libxl_disk_format format)
{
const char *type;
char *params, *devname = NULL;
tap_list_t tap;
int err;
type = libxl__device_disk_string_of_format(format);
err = tap_ctl_find(type, disk, &tap);
if (err == 0) {
devname = libxl__sprintf(gc, "/dev/xen/blktap-2/tapdev%d", tap.minor);
if (devname)
return devname;
}
params = libxl__sprintf(gc, "%s:%s", type, disk);
err = tap_ctl_create(params, &devname);
if (!err) {
libxl__ptr_add(gc, devname);
return devname;
}
return NULL;
}
int libxl__device_destroy_tapdisk(libxl__gc *gc, const char *params)
{
char *type, *disk;
int err;
tap_list_t tap;
type = libxl__strdup(gc, params);
disk = strchr(type, ':');
if (!disk) {
LOG(ERROR, "Unable to parse params %s", params);
return ERROR_INVAL;
}
*disk++ = '\0';
err = tap_ctl_find(type, disk, &tap);
if (err < 0) {
/* returns -errno */
LOGEV(ERROR, -err, "Unable to find type %s disk %s", type, disk);
return ERROR_FAIL;
}
err = tap_ctl_destroy(tap.id, tap.minor);
if (err < 0) {
LOGEV(ERROR, -err, "Failed to destroy tap device id %d minor %d",
tap.id, tap.minor);
return ERROR_FAIL;
}
return 0;
}
/*
* Local variables:
* mode: C
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
|
