1 /*
2 * Copyright (C) 2010 Advanced Micro Devices
3 * Author Christoph Egger <Christoph.Egger@amd.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License as published
7 * by the Free Software Foundation; version 2.1 only.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU Lesser General Public License for more details.
13 */
14
15 #include "libxl_osdeps.h" /* must come before any other headers */
16 #include "libxl_internal.h"
17
18 #include "tap-ctl.h"
19
libxl__blktap_enabled(libxl__gc * gc)20 int libxl__blktap_enabled(libxl__gc *gc)
21 {
22 const char *msg;
23 return !tap_ctl_check(&msg);
24 }
25
libxl__blktap_devpath(libxl__gc * gc,const char * disk,libxl_disk_format format)26 char *libxl__blktap_devpath(libxl__gc *gc,
27 const char *disk,
28 libxl_disk_format format)
29 {
30 const char *type;
31 char *params, *devname = NULL;
32 tap_list_t tap;
33 int err;
34
35 type = libxl__device_disk_string_of_format(format);
36 err = tap_ctl_find(type, disk, &tap);
37 if (err == 0) {
38 devname = GCSPRINTF("/dev/xen/blktap-2/tapdev%d", tap.minor);
39 if (devname)
40 return devname;
41 }
42
43 params = GCSPRINTF("%s:%s", type, disk);
44 err = tap_ctl_create(params, &devname);
45 if (!err) {
46 libxl__ptr_add(gc, devname);
47 return devname;
48 }
49
50 free(devname);
51 return NULL;
52 }
53
54
libxl__device_destroy_tapdisk(libxl__gc * gc,const char * params)55 int libxl__device_destroy_tapdisk(libxl__gc *gc, const char *params)
56 {
57 char *type, *disk;
58 int err;
59 tap_list_t tap;
60
61 type = libxl__strdup(gc, params);
62
63 disk = strchr(type, ':');
64 if (!disk) {
65 LOG(ERROR, "Unable to parse params %s", params);
66 return ERROR_INVAL;
67 }
68
69 *disk++ = '\0';
70
71 err = tap_ctl_find(type, disk, &tap);
72 if (err < 0) {
73 /* returns -errno */
74 LOGEV(ERROR, -err, "Unable to find type %s disk %s", type, disk);
75 return ERROR_FAIL;
76 }
77
78 err = tap_ctl_destroy(tap.id, tap.minor);
79 if (err < 0) {
80 LOGEV(ERROR, -err, "Failed to destroy tap device id %d minor %d",
81 tap.id, tap.minor);
82 return ERROR_FAIL;
83 }
84
85 return 0;
86 }
87
88 /*
89 * Local variables:
90 * mode: C
91 * c-basic-offset: 4
92 * indent-tabs-mode: nil
93 * End:
94 */
95