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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/*
* Copyright (C) 2009 Citrix Ltd.
* Author Vincent Hanquez <vincent.hanquez@eu.citrix.com>
* Author Stefano Stabellini <stefano.stabellini@eu.citrix.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. with the special
* exception on linking described in file LICENSE.
*
* 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 <string.h>
#include "libxl.h"
#include "libxl_internal.h"
#include <sys/time.h> /* for struct timeval */
char *string_of_kinds[] = {
[DEVICE_VIF] = "vif",
[DEVICE_VBD] = "vbd",
[DEVICE_TAP] = "tap",
[DEVICE_PCI] = "pci",
[DEVICE_VFB] = "vfb",
[DEVICE_VKBD] = "vkbd",
};
int libxl_device_generic_add(struct libxl_ctx *ctx, libxl_device *device,
char **bents, char **fents)
{
char *dom_path_backend, *dom_path, *frontend_path, *backend_path, *hotplug_path;
xs_transaction_t t;
struct xs_permissions frontend_perms[2];
struct xs_permissions backend_perms[2];
struct xs_permissions hotplug_perms[1];
dom_path_backend = xs_get_domain_path(ctx->xsh, device->backend_domid);
dom_path = xs_get_domain_path(ctx->xsh, device->domid);
frontend_path = libxl_sprintf(ctx, "%s/device/%s/%d",
dom_path, string_of_kinds[device->kind], device->devid);
backend_path = libxl_sprintf(ctx, "%s/backend/%s/%u/%d",
dom_path_backend, string_of_kinds[device->backend_kind], device->domid, device->devid);
hotplug_path = libxl_sprintf(ctx, "/xapi/%d/hotplug/%s/%d",
device->domid, string_of_kinds[device->kind], device->devid);
frontend_perms[0].id = device->domid;
frontend_perms[0].perms = XS_PERM_NONE;
frontend_perms[1].id = device->backend_domid;
frontend_perms[1].perms = XS_PERM_READ;
backend_perms[0].id = device->backend_domid;
backend_perms[0].perms = XS_PERM_NONE;
backend_perms[1].id = device->domid;
backend_perms[1].perms = XS_PERM_READ;
hotplug_perms[0].id = device->backend_domid;
hotplug_perms[0].perms = XS_PERM_NONE;
retry_transaction:
t = xs_transaction_start(ctx->xsh);
/* FIXME: read frontend_path and check state before removing stuff */
xs_rm(ctx->xsh, t, frontend_path);
xs_rm(ctx->xsh, t, backend_path);
xs_mkdir(ctx->xsh, t, frontend_path);
xs_set_permissions(ctx->xsh, t, frontend_path, frontend_perms, ARRAY_SIZE(frontend_perms));
xs_mkdir(ctx->xsh, t, backend_path);
xs_set_permissions(ctx->xsh, t, backend_path, backend_perms, ARRAY_SIZE(backend_perms));
xs_mkdir(ctx->xsh, t, hotplug_path);
xs_set_permissions(ctx->xsh, t, hotplug_path, hotplug_perms, ARRAY_SIZE(hotplug_perms));
xs_write(ctx->xsh, t, libxl_sprintf(ctx, "%s/backend", frontend_path), backend_path, strlen(backend_path));
xs_write(ctx->xsh, t, libxl_sprintf(ctx, "%s/frontend", backend_path), frontend_path, strlen(frontend_path));
/* and write frontend kvs and backend kvs */
libxl_xs_writev(ctx, t, backend_path, bents);
libxl_xs_writev(ctx, t, frontend_path, fents);
if (!xs_transaction_end(ctx->xsh, t, 0))
if (errno == EAGAIN)
goto retry_transaction;
return 0;
}
char *device_disk_string_of_phystype(libxl_disk_phystype phystype)
{
switch (phystype) {
case PHYSTYPE_QCOW: return "qcow";
case PHYSTYPE_QCOW2: return "qcow2";
case PHYSTYPE_VHD: return "vhd";
case PHYSTYPE_AIO: return "aio";
case PHYSTYPE_FILE: return "file";
case PHYSTYPE_PHY: return "phy";
default: return NULL;
}
}
char *device_disk_backend_type_of_phystype(libxl_disk_phystype phystype)
{
switch (phystype) {
case PHYSTYPE_QCOW: return "tap";
case PHYSTYPE_VHD: return "tap";
case PHYSTYPE_AIO: return "tap";
case PHYSTYPE_FILE: return "file";
case PHYSTYPE_PHY: return "phy";
default: return NULL;
}
}
int device_disk_major_minor(char *virtpath, int *major, int *minor)
{
if (strstr(virtpath, "sd") == virtpath) {
return -1;
} else if (strstr(virtpath, "xvd") == virtpath) {
return -1;
} else if (strstr(virtpath, "hd") == virtpath) {
char letter, letter2;
*major = 0; *minor = 0;
letter = virtpath[2];
if (letter < 'a' || letter > 't')
return -1;
letter2 = virtpath[3];
*major = letter - 'a';
*minor = atoi(virtpath + 3);
return 0;
} else {
return -1;
}
}
int device_disk_dev_number(char *virtpath)
{
int majors_table[] = { 3, 22, 33, 34, 56, 57, 88, 89, 90, 91 };
int major, minor;
if (device_disk_major_minor(virtpath, &major, &minor))
return -1;
return majors_table[major / 2] * 256 + (64 * (major % 2)) + minor;
}
int libxl_device_destroy(struct libxl_ctx *ctx, char *be_path, int force)
{
xs_transaction_t t;
char *state_path = libxl_sprintf(ctx, "%s/state", be_path);
char *state = libxl_xs_read(ctx, XBT_NULL, state_path);
if (!state)
return 0;
if (atoi(state) <= 3) {
xs_rm(ctx->xsh, XBT_NULL, be_path);
return 0;
}
retry_transaction:
t = xs_transaction_start(ctx->xsh);
xs_write(ctx->xsh, t, libxl_sprintf(ctx, "%s/online", be_path), "0", strlen("0"));
xs_write(ctx->xsh, t, state_path, "5", strlen("5"));
if (!xs_transaction_end(ctx->xsh, t, 0)) {
if (errno == EAGAIN)
goto retry_transaction;
else
return -1;
}
if (!force) {
xs_watch(ctx->xsh, state_path, be_path);
return 1;
} else
return 0;
}
int libxl_devices_destroy(struct libxl_ctx *ctx, uint32_t domid, int force)
{
char *path, *be_path, *fe_path;
unsigned int num1, num2;
char **l1 = NULL, **l2 = NULL;
int i, j, nfds, n = 0, n_watches = 0;
fd_set rfds;
struct timeval tv;
flexarray_t *toremove;
toremove = flexarray_make(16, 1);
path = libxl_sprintf(ctx, "/local/domain/%d/device", domid);
l1 = libxl_xs_directory(ctx, XBT_NULL, path, &num1);
if (!l1) {
XL_LOG(ctx, XL_LOG_ERROR, "%s is empty\n", path);
return -1;
}
for (i = 0; i < num1; i++) {
path = libxl_sprintf(ctx, "/local/domain/%d/device/%s", domid, l1[i]);
l2 = libxl_xs_directory(ctx, XBT_NULL, path, &num2);
if (!l2)
continue;
for (j = 0; j < num2; j++) {
fe_path = libxl_sprintf(ctx, "/local/domain/%d/device/%s/%s", domid, l1[i], l2[j]);
be_path = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/backend", fe_path));
if (be_path != NULL) {
if (libxl_device_destroy(ctx, be_path, force) > 0)
n_watches++;
flexarray_set(toremove, n++, libxl_dirname(ctx, be_path));
} else {
xs_rm(ctx->xsh, XBT_NULL, path);
}
}
}
if (!force) {
nfds = xs_fileno(ctx->xsh) + 1;
/* Linux-ism */
tv.tv_sec = LIBXL_DESTROY_TIMEOUT;
tv.tv_usec = 0;
while (n_watches > 0 && tv.tv_sec > 0) {
FD_ZERO(&rfds);
FD_SET(xs_fileno(ctx->xsh), &rfds);
if (select(nfds, &rfds, NULL, NULL, &tv) > 0) {
l1 = xs_read_watch(ctx->xsh, &num1);
if (l1 != NULL) {
char *state = libxl_xs_read(ctx, XBT_NULL, l1[0]);
if (!state || atoi(state) == 6) {
xs_unwatch(ctx->xsh, l1[0], l1[1]);
xs_rm(ctx->xsh, XBT_NULL, l1[1]);
XL_LOG(ctx, XL_LOG_DEBUG, "Destroyed device backend at %s\n", l1[1]);
n_watches--;
}
}
} else
break;
}
}
for (i = 0; i < n; i++) {
flexarray_get(toremove, i, (void**) &path);
xs_rm(ctx->xsh, XBT_NULL, path);
}
flexarray_free(toremove);
return 0;
}
|
