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/*
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* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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*
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* Network Block Device
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu-common.h" |
20 |
#include "block.h" |
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#include "nbd.h" |
22 |
|
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#include <stdarg.h> |
24 |
#include <stdio.h> |
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#include <getopt.h> |
26 |
#include <err.h> |
27 |
#include <sys/types.h> |
28 |
#include <sys/socket.h> |
29 |
#include <netinet/in.h> |
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#include <netinet/tcp.h> |
31 |
#include <arpa/inet.h> |
32 |
#include <signal.h> |
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#include <libgen.h> |
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#include <pthread.h> |
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|
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#define SOCKET_PATH "/var/lock/qemu-nbd-%s" |
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#define QEMU_NBD_OPT_CACHE 1 |
38 |
#define QEMU_NBD_OPT_AIO 2 |
39 |
|
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static NBDExport *exp;
|
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static int verbose; |
42 |
static char *srcpath; |
43 |
static char *sockpath; |
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static int persistent = 0; |
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static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; |
46 |
static int shared = 1; |
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static int nb_fds; |
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|
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static void usage(const char *name) |
50 |
{ |
51 |
(printf) ( |
52 |
"Usage: %s [OPTIONS] FILE\n"
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"QEMU Disk Network Block Device Server\n"
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"\n"
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" -h, --help display this help and exit\n"
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" -V, --version output version information and exit\n"
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"\n"
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"Connection properties:\n"
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" -p, --port=PORT port to listen on (default `%d')\n"
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" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
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" -k, --socket=PATH path to the unix socket\n"
|
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" (default '"SOCKET_PATH"')\n" |
63 |
" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
|
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" -t, --persistent don't exit on the last connection\n"
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" -v, --verbose display extra debugging information\n"
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"\n"
|
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"Exposing part of the image:\n"
|
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" -o, --offset=OFFSET offset into the image\n"
|
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" -P, --partition=NUM only expose partition NUM\n"
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"\n"
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#ifdef __linux__
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"Kernel NBD client support:\n"
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" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
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" -d, --disconnect disconnect the specified device\n"
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"\n"
|
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#endif
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"\n"
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78 |
"Block device options:\n"
|
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" -r, --read-only export read-only\n"
|
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" -s, --snapshot use snapshot file\n"
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" -n, --nocache disable host cache\n"
|
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" --cache=MODE set cache mode (none, writeback, ...)\n"
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#ifdef CONFIG_LINUX_AIO
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" --aio=MODE set AIO mode (native or threads)\n"
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#endif
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"\n"
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"Report bugs to <qemu-devel@nongnu.org>\n"
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, name, NBD_DEFAULT_PORT, "DEVICE");
|
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} |
90 |
|
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static void version(const char *name) |
92 |
{ |
93 |
printf( |
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"%s version 0.0.1\n"
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"Written by Anthony Liguori.\n"
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"\n"
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"Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
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"This is free software; see the source for copying conditions. There is NO\n"
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"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
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, name); |
101 |
} |
102 |
|
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struct partition_record
|
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{ |
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uint8_t bootable; |
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uint8_t start_head; |
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uint32_t start_cylinder; |
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uint8_t start_sector; |
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uint8_t system; |
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uint8_t end_head; |
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uint8_t end_cylinder; |
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uint8_t end_sector; |
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uint32_t start_sector_abs; |
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uint32_t nb_sectors_abs; |
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}; |
116 |
|
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static void read_partition(uint8_t *p, struct partition_record *r) |
118 |
{ |
119 |
r->bootable = p[0];
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r->start_head = p[1];
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r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); |
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r->start_sector = p[2] & 0x3f; |
123 |
r->system = p[4];
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r->end_head = p[5];
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r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); |
126 |
r->end_sector = p[6] & 0x3f; |
127 |
r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; |
128 |
r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; |
129 |
} |
130 |
|
131 |
static int find_partition(BlockDriverState *bs, int partition, |
132 |
off_t *offset, off_t *size) |
133 |
{ |
134 |
struct partition_record mbr[4]; |
135 |
uint8_t data[512];
|
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int i;
|
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int ext_partnum = 4; |
138 |
int ret;
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139 |
|
140 |
if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { |
141 |
errno = -ret; |
142 |
err(EXIT_FAILURE, "error while reading");
|
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} |
144 |
|
145 |
if (data[510] != 0x55 || data[511] != 0xaa) { |
146 |
return -EINVAL;
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} |
148 |
|
149 |
for (i = 0; i < 4; i++) { |
150 |
read_partition(&data[446 + 16 * i], &mbr[i]); |
151 |
|
152 |
if (!mbr[i].nb_sectors_abs)
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continue;
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154 |
|
155 |
if (mbr[i].system == 0xF || mbr[i].system == 0x5) { |
156 |
struct partition_record ext[4]; |
157 |
uint8_t data1[512];
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int j;
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159 |
|
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if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { |
161 |
errno = -ret; |
162 |
err(EXIT_FAILURE, "error while reading");
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} |
164 |
|
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for (j = 0; j < 4; j++) { |
166 |
read_partition(&data1[446 + 16 * j], &ext[j]); |
167 |
if (!ext[j].nb_sectors_abs)
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continue;
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169 |
|
170 |
if ((ext_partnum + j + 1) == partition) { |
171 |
*offset = (uint64_t)ext[j].start_sector_abs << 9;
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*size = (uint64_t)ext[j].nb_sectors_abs << 9;
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return 0; |
174 |
} |
175 |
} |
176 |
ext_partnum += 4;
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177 |
} else if ((i + 1) == partition) { |
178 |
*offset = (uint64_t)mbr[i].start_sector_abs << 9;
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*size = (uint64_t)mbr[i].nb_sectors_abs << 9;
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return 0; |
181 |
} |
182 |
} |
183 |
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184 |
return -ENOENT;
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} |
186 |
|
187 |
static void termsig_handler(int signum) |
188 |
{ |
189 |
state = TERMINATE; |
190 |
qemu_notify_event(); |
191 |
} |
192 |
|
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static void *show_parts(void *arg) |
194 |
{ |
195 |
char *device = arg;
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int nbd;
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197 |
|
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/* linux just needs an open() to trigger
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* the partition table update
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* but remember to load the module with max_part != 0 :
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* modprobe nbd max_part=63
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*/
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203 |
nbd = open(device, O_RDWR); |
204 |
if (nbd >= 0) { |
205 |
close(nbd); |
206 |
} |
207 |
return NULL; |
208 |
} |
209 |
|
210 |
static void *nbd_client_thread(void *arg) |
211 |
{ |
212 |
char *device = arg;
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off_t size; |
214 |
size_t blocksize; |
215 |
uint32_t nbdflags; |
216 |
int fd, sock;
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217 |
int ret;
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pthread_t show_parts_thread; |
219 |
|
220 |
sock = unix_socket_outgoing(sockpath); |
221 |
if (sock < 0) { |
222 |
goto out;
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223 |
} |
224 |
|
225 |
ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
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&size, &blocksize); |
227 |
if (ret < 0) { |
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goto out;
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229 |
} |
230 |
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fd = open(device, O_RDWR); |
232 |
if (fd < 0) { |
233 |
/* Linux-only, we can use %m in printf. */
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fprintf(stderr, "Failed to open %s: %m", device);
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goto out;
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236 |
} |
237 |
|
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ret = nbd_init(fd, sock, nbdflags, size, blocksize); |
239 |
if (ret < 0) { |
240 |
goto out;
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} |
242 |
|
243 |
/* update partition table */
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pthread_create(&show_parts_thread, NULL, show_parts, device);
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245 |
|
246 |
if (verbose) {
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fprintf(stderr, "NBD device %s is now connected to %s\n",
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device, srcpath); |
249 |
} else {
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250 |
/* Close stderr so that the qemu-nbd process exits. */
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dup2(STDOUT_FILENO, STDERR_FILENO); |
252 |
} |
253 |
|
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ret = nbd_client(fd); |
255 |
if (ret) {
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goto out;
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257 |
} |
258 |
close(fd); |
259 |
kill(getpid(), SIGTERM); |
260 |
return (void *) EXIT_SUCCESS; |
261 |
|
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out:
|
263 |
kill(getpid(), SIGTERM); |
264 |
return (void *) EXIT_FAILURE; |
265 |
} |
266 |
|
267 |
static int nbd_can_accept(void *opaque) |
268 |
{ |
269 |
return nb_fds < shared;
|
270 |
} |
271 |
|
272 |
static void nbd_export_closed(NBDExport *exp) |
273 |
{ |
274 |
assert(state == TERMINATING); |
275 |
state = TERMINATED; |
276 |
} |
277 |
|
278 |
static void nbd_client_closed(NBDClient *client) |
279 |
{ |
280 |
nb_fds--; |
281 |
if (nb_fds == 0 && !persistent && state == RUNNING) { |
282 |
state = TERMINATE; |
283 |
} |
284 |
qemu_notify_event(); |
285 |
nbd_client_put(client); |
286 |
} |
287 |
|
288 |
static void nbd_accept(void *opaque) |
289 |
{ |
290 |
int server_fd = (uintptr_t) opaque;
|
291 |
struct sockaddr_in addr;
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292 |
socklen_t addr_len = sizeof(addr);
|
293 |
|
294 |
int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); |
295 |
if (state >= TERMINATE) {
|
296 |
close(fd); |
297 |
return;
|
298 |
} |
299 |
|
300 |
if (fd >= 0 && nbd_client_new(exp, fd, nbd_client_closed)) { |
301 |
nb_fds++; |
302 |
} |
303 |
} |
304 |
|
305 |
int main(int argc, char **argv) |
306 |
{ |
307 |
BlockDriverState *bs; |
308 |
off_t dev_offset = 0;
|
309 |
uint32_t nbdflags = 0;
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310 |
bool disconnect = false; |
311 |
const char *bindto = "0.0.0.0"; |
312 |
char *device = NULL; |
313 |
int port = NBD_DEFAULT_PORT;
|
314 |
off_t fd_size; |
315 |
const char *sopt = "hVb:o:p:rsnP:c:dvk:e:t"; |
316 |
struct option lopt[] = {
|
317 |
{ "help", 0, NULL, 'h' }, |
318 |
{ "version", 0, NULL, 'V' }, |
319 |
{ "bind", 1, NULL, 'b' }, |
320 |
{ "port", 1, NULL, 'p' }, |
321 |
{ "socket", 1, NULL, 'k' }, |
322 |
{ "offset", 1, NULL, 'o' }, |
323 |
{ "read-only", 0, NULL, 'r' }, |
324 |
{ "partition", 1, NULL, 'P' }, |
325 |
{ "connect", 1, NULL, 'c' }, |
326 |
{ "disconnect", 0, NULL, 'd' }, |
327 |
{ "snapshot", 0, NULL, 's' }, |
328 |
{ "nocache", 0, NULL, 'n' }, |
329 |
{ "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, |
330 |
#ifdef CONFIG_LINUX_AIO
|
331 |
{ "aio", 1, NULL, QEMU_NBD_OPT_AIO }, |
332 |
#endif
|
333 |
{ "shared", 1, NULL, 'e' }, |
334 |
{ "persistent", 0, NULL, 't' }, |
335 |
{ "verbose", 0, NULL, 'v' }, |
336 |
{ NULL, 0, NULL, 0 } |
337 |
}; |
338 |
int ch;
|
339 |
int opt_ind = 0; |
340 |
int li;
|
341 |
char *end;
|
342 |
int flags = BDRV_O_RDWR;
|
343 |
int partition = -1; |
344 |
int ret;
|
345 |
int fd;
|
346 |
bool seen_cache = false; |
347 |
#ifdef CONFIG_LINUX_AIO
|
348 |
bool seen_aio = false; |
349 |
#endif
|
350 |
pthread_t client_thread; |
351 |
|
352 |
/* The client thread uses SIGTERM to interrupt the server. A signal
|
353 |
* handler ensures that "qemu-nbd -v -c" exits with a nice status code.
|
354 |
*/
|
355 |
struct sigaction sa_sigterm;
|
356 |
memset(&sa_sigterm, 0, sizeof(sa_sigterm)); |
357 |
sa_sigterm.sa_handler = termsig_handler; |
358 |
sigaction(SIGTERM, &sa_sigterm, NULL);
|
359 |
|
360 |
while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { |
361 |
switch (ch) {
|
362 |
case 's': |
363 |
flags |= BDRV_O_SNAPSHOT; |
364 |
break;
|
365 |
case 'n': |
366 |
optarg = (char *) "none"; |
367 |
/* fallthrough */
|
368 |
case QEMU_NBD_OPT_CACHE:
|
369 |
if (seen_cache) {
|
370 |
errx(EXIT_FAILURE, "-n and --cache can only be specified once");
|
371 |
} |
372 |
seen_cache = true;
|
373 |
if (bdrv_parse_cache_flags(optarg, &flags) == -1) { |
374 |
errx(EXIT_FAILURE, "Invalid cache mode `%s'", optarg);
|
375 |
} |
376 |
break;
|
377 |
#ifdef CONFIG_LINUX_AIO
|
378 |
case QEMU_NBD_OPT_AIO:
|
379 |
if (seen_aio) {
|
380 |
errx(EXIT_FAILURE, "--aio can only be specified once");
|
381 |
} |
382 |
seen_aio = true;
|
383 |
if (!strcmp(optarg, "native")) { |
384 |
flags |= BDRV_O_NATIVE_AIO; |
385 |
} else if (!strcmp(optarg, "threads")) { |
386 |
/* this is the default */
|
387 |
} else {
|
388 |
errx(EXIT_FAILURE, "invalid aio mode `%s'", optarg);
|
389 |
} |
390 |
break;
|
391 |
#endif
|
392 |
case 'b': |
393 |
bindto = optarg; |
394 |
break;
|
395 |
case 'p': |
396 |
li = strtol(optarg, &end, 0);
|
397 |
if (*end) {
|
398 |
errx(EXIT_FAILURE, "Invalid port `%s'", optarg);
|
399 |
} |
400 |
if (li < 1 || li > 65535) { |
401 |
errx(EXIT_FAILURE, "Port out of range `%s'", optarg);
|
402 |
} |
403 |
port = (uint16_t)li; |
404 |
break;
|
405 |
case 'o': |
406 |
dev_offset = strtoll (optarg, &end, 0);
|
407 |
if (*end) {
|
408 |
errx(EXIT_FAILURE, "Invalid offset `%s'", optarg);
|
409 |
} |
410 |
if (dev_offset < 0) { |
411 |
errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg);
|
412 |
} |
413 |
break;
|
414 |
case 'r': |
415 |
nbdflags |= NBD_FLAG_READ_ONLY; |
416 |
flags &= ~BDRV_O_RDWR; |
417 |
break;
|
418 |
case 'P': |
419 |
partition = strtol(optarg, &end, 0);
|
420 |
if (*end)
|
421 |
errx(EXIT_FAILURE, "Invalid partition `%s'", optarg);
|
422 |
if (partition < 1 || partition > 8) |
423 |
errx(EXIT_FAILURE, "Invalid partition %d", partition);
|
424 |
break;
|
425 |
case 'k': |
426 |
sockpath = optarg; |
427 |
if (sockpath[0] != '/') |
428 |
errx(EXIT_FAILURE, "socket path must be absolute\n");
|
429 |
break;
|
430 |
case 'd': |
431 |
disconnect = true;
|
432 |
break;
|
433 |
case 'c': |
434 |
device = optarg; |
435 |
break;
|
436 |
case 'e': |
437 |
shared = strtol(optarg, &end, 0);
|
438 |
if (*end) {
|
439 |
errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg);
|
440 |
} |
441 |
if (shared < 1) { |
442 |
errx(EXIT_FAILURE, "Shared device number must be greater than 0\n");
|
443 |
} |
444 |
break;
|
445 |
case 't': |
446 |
persistent = 1;
|
447 |
break;
|
448 |
case 'v': |
449 |
verbose = 1;
|
450 |
break;
|
451 |
case 'V': |
452 |
version(argv[0]);
|
453 |
exit(0);
|
454 |
break;
|
455 |
case 'h': |
456 |
usage(argv[0]);
|
457 |
exit(0);
|
458 |
break;
|
459 |
case '?': |
460 |
errx(EXIT_FAILURE, "Try `%s --help' for more information.",
|
461 |
argv[0]);
|
462 |
} |
463 |
} |
464 |
|
465 |
if ((argc - optind) != 1) { |
466 |
errx(EXIT_FAILURE, "Invalid number of argument.\n"
|
467 |
"Try `%s --help' for more information.",
|
468 |
argv[0]);
|
469 |
} |
470 |
|
471 |
if (disconnect) {
|
472 |
fd = open(argv[optind], O_RDWR); |
473 |
if (fd < 0) { |
474 |
err(EXIT_FAILURE, "Cannot open %s", argv[optind]);
|
475 |
} |
476 |
nbd_disconnect(fd); |
477 |
|
478 |
close(fd); |
479 |
|
480 |
printf("%s disconnected\n", argv[optind]);
|
481 |
|
482 |
return 0; |
483 |
} |
484 |
|
485 |
if (device && !verbose) {
|
486 |
int stderr_fd[2]; |
487 |
pid_t pid; |
488 |
int ret;
|
489 |
|
490 |
if (qemu_pipe(stderr_fd) < 0) { |
491 |
err(EXIT_FAILURE, "Error setting up communication pipe");
|
492 |
} |
493 |
|
494 |
/* Now daemonize, but keep a communication channel open to
|
495 |
* print errors and exit with the proper status code.
|
496 |
*/
|
497 |
pid = fork(); |
498 |
if (pid == 0) { |
499 |
close(stderr_fd[0]);
|
500 |
ret = qemu_daemon(1, 0); |
501 |
|
502 |
/* Temporarily redirect stderr to the parent's pipe... */
|
503 |
dup2(stderr_fd[1], STDERR_FILENO);
|
504 |
if (ret < 0) { |
505 |
err(EXIT_FAILURE, "Failed to daemonize");
|
506 |
} |
507 |
|
508 |
/* ... close the descriptor we inherited and go on. */
|
509 |
close(stderr_fd[1]);
|
510 |
} else {
|
511 |
bool errors = false; |
512 |
char *buf;
|
513 |
|
514 |
/* In the parent. Print error messages from the child until
|
515 |
* it closes the pipe.
|
516 |
*/
|
517 |
close(stderr_fd[1]);
|
518 |
buf = g_malloc(1024);
|
519 |
while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { |
520 |
errors = true;
|
521 |
ret = qemu_write_full(STDERR_FILENO, buf, ret); |
522 |
if (ret < 0) { |
523 |
exit(EXIT_FAILURE); |
524 |
} |
525 |
} |
526 |
if (ret < 0) { |
527 |
err(EXIT_FAILURE, "Cannot read from daemon");
|
528 |
} |
529 |
|
530 |
/* Usually the daemon should not print any message.
|
531 |
* Exit with zero status in that case.
|
532 |
*/
|
533 |
exit(errors); |
534 |
} |
535 |
} |
536 |
|
537 |
if (device != NULL && sockpath == NULL) { |
538 |
sockpath = g_malloc(128);
|
539 |
snprintf(sockpath, 128, SOCKET_PATH, basename(device));
|
540 |
} |
541 |
|
542 |
bdrv_init(); |
543 |
atexit(bdrv_close_all); |
544 |
|
545 |
bs = bdrv_new("hda");
|
546 |
srcpath = argv[optind]; |
547 |
if ((ret = bdrv_open(bs, srcpath, flags, NULL)) < 0) { |
548 |
errno = -ret; |
549 |
err(EXIT_FAILURE, "Failed to bdrv_open '%s'", argv[optind]);
|
550 |
} |
551 |
|
552 |
fd_size = bdrv_getlength(bs); |
553 |
|
554 |
if (partition != -1) { |
555 |
ret = find_partition(bs, partition, &dev_offset, &fd_size); |
556 |
if (ret < 0) { |
557 |
errno = -ret; |
558 |
err(EXIT_FAILURE, "Could not find partition %d", partition);
|
559 |
} |
560 |
} |
561 |
|
562 |
exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed); |
563 |
|
564 |
if (sockpath) {
|
565 |
fd = unix_socket_incoming(sockpath); |
566 |
} else {
|
567 |
fd = tcp_socket_incoming(bindto, port); |
568 |
} |
569 |
|
570 |
if (fd < 0) { |
571 |
return 1; |
572 |
} |
573 |
|
574 |
if (device) {
|
575 |
int ret;
|
576 |
|
577 |
ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
|
578 |
if (ret != 0) { |
579 |
errx(EXIT_FAILURE, "Failed to create client thread: %s",
|
580 |
strerror(ret)); |
581 |
} |
582 |
} else {
|
583 |
/* Shut up GCC warnings. */
|
584 |
memset(&client_thread, 0, sizeof(client_thread)); |
585 |
} |
586 |
|
587 |
qemu_init_main_loop(); |
588 |
qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL,
|
589 |
(void *)(uintptr_t)fd);
|
590 |
|
591 |
/* now when the initialization is (almost) complete, chdir("/")
|
592 |
* to free any busy filesystems */
|
593 |
if (chdir("/") < 0) { |
594 |
err(EXIT_FAILURE, "Could not chdir to root directory");
|
595 |
} |
596 |
|
597 |
state = RUNNING; |
598 |
do {
|
599 |
main_loop_wait(false);
|
600 |
if (state == TERMINATE) {
|
601 |
state = TERMINATING; |
602 |
nbd_export_close(exp); |
603 |
nbd_export_put(exp); |
604 |
exp = NULL;
|
605 |
} |
606 |
} while (state != TERMINATED);
|
607 |
|
608 |
bdrv_close(bs); |
609 |
if (sockpath) {
|
610 |
unlink(sockpath); |
611 |
} |
612 |
|
613 |
if (device) {
|
614 |
void *ret;
|
615 |
pthread_join(client_thread, &ret); |
616 |
exit(ret != NULL);
|
617 |
} else {
|
618 |
exit(EXIT_SUCCESS); |
619 |
} |
620 |
} |