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Commit | Line | Data |
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75818250 TS |
1 | /* |
2 | * QEMU Block driver for NBD | |
3 | * | |
4 | * Copyright (C) 2008 Bull S.A.S. | |
bd5921b4 | 5 | * Author: Laurent Vivier <Laurent.Vivier@bull.net> |
75818250 TS |
6 | * |
7 | * Some parts: | |
8 | * Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws> | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
26 | * THE SOFTWARE. | |
27 | */ | |
28 | ||
29 | #include "qemu-common.h" | |
737e150e | 30 | #include "block/nbd.h" |
1de7afc9 | 31 | #include "qemu/uri.h" |
737e150e | 32 | #include "block/block_int.h" |
1de7afc9 PB |
33 | #include "qemu/module.h" |
34 | #include "qemu/sockets.h" | |
f53a1feb KW |
35 | #include "qapi/qmp/qjson.h" |
36 | #include "qapi/qmp/qint.h" | |
75818250 TS |
37 | |
38 | #include <sys/types.h> | |
39 | #include <unistd.h> | |
75818250 | 40 | |
1d45f8b5 LV |
41 | #define EN_OPTSTR ":exportname=" |
42 | ||
33897dc7 NT |
43 | /* #define DEBUG_NBD */ |
44 | ||
45 | #if defined(DEBUG_NBD) | |
46 | #define logout(fmt, ...) \ | |
47 | fprintf(stderr, "nbd\t%-24s" fmt, __func__, ##__VA_ARGS__) | |
48 | #else | |
49 | #define logout(fmt, ...) ((void)0) | |
50 | #endif | |
51 | ||
ecda3447 PB |
52 | #define MAX_NBD_REQUESTS 16 |
53 | #define HANDLE_TO_INDEX(bs, handle) ((handle) ^ ((uint64_t)(intptr_t)bs)) | |
54 | #define INDEX_TO_HANDLE(bs, index) ((index) ^ ((uint64_t)(intptr_t)bs)) | |
55 | ||
75818250 TS |
56 | typedef struct BDRVNBDState { |
57 | int sock; | |
b90fb4b8 | 58 | uint32_t nbdflags; |
75818250 TS |
59 | off_t size; |
60 | size_t blocksize; | |
33897dc7 | 61 | |
ecda3447 PB |
62 | CoMutex send_mutex; |
63 | CoMutex free_sema; | |
64 | Coroutine *send_coroutine; | |
65 | int in_flight; | |
ae255e52 | 66 | |
ecda3447 | 67 | Coroutine *recv_coroutine[MAX_NBD_REQUESTS]; |
ae255e52 PB |
68 | struct nbd_reply reply; |
69 | ||
f53a1feb KW |
70 | bool is_unix; |
71 | QemuOpts *socket_opts; | |
f17c90be | 72 | |
d04b0bbb | 73 | char *export_name; /* An NBD server may export several devices */ |
75818250 TS |
74 | } BDRVNBDState; |
75 | ||
f53a1feb | 76 | static int nbd_parse_uri(const char *filename, QDict *options) |
1d7d2a9d PB |
77 | { |
78 | URI *uri; | |
79 | const char *p; | |
80 | QueryParams *qp = NULL; | |
81 | int ret = 0; | |
f53a1feb | 82 | bool is_unix; |
1d7d2a9d PB |
83 | |
84 | uri = uri_parse(filename); | |
85 | if (!uri) { | |
86 | return -EINVAL; | |
87 | } | |
88 | ||
89 | /* transport */ | |
90 | if (!strcmp(uri->scheme, "nbd")) { | |
f53a1feb | 91 | is_unix = false; |
1d7d2a9d | 92 | } else if (!strcmp(uri->scheme, "nbd+tcp")) { |
f53a1feb | 93 | is_unix = false; |
1d7d2a9d | 94 | } else if (!strcmp(uri->scheme, "nbd+unix")) { |
f53a1feb | 95 | is_unix = true; |
1d7d2a9d PB |
96 | } else { |
97 | ret = -EINVAL; | |
98 | goto out; | |
99 | } | |
100 | ||
101 | p = uri->path ? uri->path : "/"; | |
102 | p += strspn(p, "/"); | |
103 | if (p[0]) { | |
f53a1feb | 104 | qdict_put(options, "export", qstring_from_str(p)); |
1d7d2a9d PB |
105 | } |
106 | ||
107 | qp = query_params_parse(uri->query); | |
f53a1feb | 108 | if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) { |
1d7d2a9d PB |
109 | ret = -EINVAL; |
110 | goto out; | |
111 | } | |
112 | ||
f53a1feb | 113 | if (is_unix) { |
1d7d2a9d PB |
114 | /* nbd+unix:///export?socket=path */ |
115 | if (uri->server || uri->port || strcmp(qp->p[0].name, "socket")) { | |
116 | ret = -EINVAL; | |
117 | goto out; | |
118 | } | |
f53a1feb | 119 | qdict_put(options, "path", qstring_from_str(qp->p[0].value)); |
1d7d2a9d | 120 | } else { |
bebbf7fa | 121 | /* nbd[+tcp]://host[:port]/export */ |
1d7d2a9d PB |
122 | if (!uri->server) { |
123 | ret = -EINVAL; | |
124 | goto out; | |
125 | } | |
f17c90be | 126 | |
f53a1feb | 127 | qdict_put(options, "host", qstring_from_str(uri->server)); |
bebbf7fa KW |
128 | if (uri->port) { |
129 | char* port_str = g_strdup_printf("%d", uri->port); | |
130 | qdict_put(options, "port", qstring_from_str(port_str)); | |
131 | g_free(port_str); | |
132 | } | |
1d7d2a9d PB |
133 | } |
134 | ||
135 | out: | |
136 | if (qp) { | |
137 | query_params_free(qp); | |
138 | } | |
139 | uri_free(uri); | |
140 | return ret; | |
141 | } | |
142 | ||
6963a30d KW |
143 | static void nbd_parse_filename(const char *filename, QDict *options, |
144 | Error **errp) | |
75818250 | 145 | { |
1d45f8b5 | 146 | char *file; |
33897dc7 NT |
147 | char *export_name; |
148 | const char *host_spec; | |
75818250 | 149 | const char *unixpath; |
75818250 | 150 | |
681e7ad0 KW |
151 | if (qdict_haskey(options, "host") |
152 | || qdict_haskey(options, "port") | |
153 | || qdict_haskey(options, "path")) | |
154 | { | |
155 | error_setg(errp, "host/port/path and a file name may not be specified " | |
156 | "at the same time"); | |
157 | return; | |
158 | } | |
159 | ||
1d7d2a9d | 160 | if (strstr(filename, "://")) { |
6963a30d KW |
161 | int ret = nbd_parse_uri(filename, options); |
162 | if (ret < 0) { | |
163 | error_setg(errp, "No valid URL specified"); | |
164 | } | |
165 | return; | |
1d7d2a9d PB |
166 | } |
167 | ||
7267c094 | 168 | file = g_strdup(filename); |
1d45f8b5 | 169 | |
33897dc7 NT |
170 | export_name = strstr(file, EN_OPTSTR); |
171 | if (export_name) { | |
172 | if (export_name[strlen(EN_OPTSTR)] == 0) { | |
1d45f8b5 LV |
173 | goto out; |
174 | } | |
33897dc7 NT |
175 | export_name[0] = 0; /* truncate 'file' */ |
176 | export_name += strlen(EN_OPTSTR); | |
f53a1feb KW |
177 | |
178 | qdict_put(options, "export", qstring_from_str(export_name)); | |
1d45f8b5 LV |
179 | } |
180 | ||
33897dc7 NT |
181 | /* extract the host_spec - fail if it's not nbd:... */ |
182 | if (!strstart(file, "nbd:", &host_spec)) { | |
6963a30d | 183 | error_setg(errp, "File name string for NBD must start with 'nbd:'"); |
1d45f8b5 LV |
184 | goto out; |
185 | } | |
75818250 | 186 | |
f53a1feb | 187 | if (!*host_spec) { |
f53a1feb KW |
188 | goto out; |
189 | } | |
190 | ||
33897dc7 NT |
191 | /* are we a UNIX or TCP socket? */ |
192 | if (strstart(host_spec, "unix:", &unixpath)) { | |
f53a1feb | 193 | qdict_put(options, "path", qstring_from_str(unixpath)); |
75818250 | 194 | } else { |
f53a1feb KW |
195 | InetSocketAddress *addr = NULL; |
196 | ||
6963a30d KW |
197 | addr = inet_parse(host_spec, errp); |
198 | if (error_is_set(errp)) { | |
f17c90be KW |
199 | goto out; |
200 | } | |
75818250 | 201 | |
f53a1feb KW |
202 | qdict_put(options, "host", qstring_from_str(addr->host)); |
203 | qdict_put(options, "port", qstring_from_str(addr->port)); | |
204 | qapi_free_InetSocketAddress(addr); | |
205 | } | |
75818250 | 206 | |
33897dc7 | 207 | out: |
7267c094 | 208 | g_free(file); |
f53a1feb KW |
209 | } |
210 | ||
211 | static int nbd_config(BDRVNBDState *s, QDict *options) | |
212 | { | |
213 | Error *local_err = NULL; | |
214 | ||
215 | if (qdict_haskey(options, "path")) { | |
681e7ad0 KW |
216 | if (qdict_haskey(options, "host")) { |
217 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "path and host may not " | |
218 | "be used at the same time."); | |
219 | return -EINVAL; | |
220 | } | |
f53a1feb KW |
221 | s->is_unix = true; |
222 | } else if (qdict_haskey(options, "host")) { | |
223 | s->is_unix = false; | |
224 | } else { | |
225 | return -EINVAL; | |
33897dc7 | 226 | } |
f53a1feb KW |
227 | |
228 | s->socket_opts = qemu_opts_create_nofail(&socket_optslist); | |
229 | ||
230 | qemu_opts_absorb_qdict(s->socket_opts, options, &local_err); | |
231 | if (error_is_set(&local_err)) { | |
232 | qerror_report_err(local_err); | |
233 | error_free(local_err); | |
234 | return -EINVAL; | |
235 | } | |
236 | ||
bebbf7fa KW |
237 | if (!qemu_opt_get(s->socket_opts, "port")) { |
238 | qemu_opt_set_number(s->socket_opts, "port", NBD_DEFAULT_PORT); | |
239 | } | |
240 | ||
f53a1feb KW |
241 | s->export_name = g_strdup(qdict_get_try_str(options, "export")); |
242 | if (s->export_name) { | |
243 | qdict_del(options, "export"); | |
244 | } | |
245 | ||
246 | return 0; | |
33897dc7 | 247 | } |
1d45f8b5 | 248 | |
f53a1feb | 249 | |
ae255e52 PB |
250 | static void nbd_coroutine_start(BDRVNBDState *s, struct nbd_request *request) |
251 | { | |
ecda3447 PB |
252 | int i; |
253 | ||
254 | /* Poor man semaphore. The free_sema is locked when no other request | |
255 | * can be accepted, and unlocked after receiving one reply. */ | |
256 | if (s->in_flight >= MAX_NBD_REQUESTS - 1) { | |
257 | qemu_co_mutex_lock(&s->free_sema); | |
258 | assert(s->in_flight < MAX_NBD_REQUESTS); | |
259 | } | |
260 | s->in_flight++; | |
261 | ||
262 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { | |
263 | if (s->recv_coroutine[i] == NULL) { | |
264 | s->recv_coroutine[i] = qemu_coroutine_self(); | |
265 | break; | |
266 | } | |
267 | } | |
268 | ||
269 | assert(i < MAX_NBD_REQUESTS); | |
270 | request->handle = INDEX_TO_HANDLE(s, i); | |
ae255e52 PB |
271 | } |
272 | ||
273 | static int nbd_have_request(void *opaque) | |
274 | { | |
275 | BDRVNBDState *s = opaque; | |
276 | ||
ecda3447 | 277 | return s->in_flight > 0; |
ae255e52 PB |
278 | } |
279 | ||
280 | static void nbd_reply_ready(void *opaque) | |
281 | { | |
282 | BDRVNBDState *s = opaque; | |
dd3e8ac4 | 283 | uint64_t i; |
7fe7b68b | 284 | int ret; |
ae255e52 PB |
285 | |
286 | if (s->reply.handle == 0) { | |
7fe7b68b PB |
287 | /* No reply already in flight. Fetch a header. It is possible |
288 | * that another thread has done the same thing in parallel, so | |
289 | * the socket is not readable anymore. | |
290 | */ | |
291 | ret = nbd_receive_reply(s->sock, &s->reply); | |
292 | if (ret == -EAGAIN) { | |
293 | return; | |
294 | } | |
295 | if (ret < 0) { | |
ae255e52 | 296 | s->reply.handle = 0; |
ecda3447 | 297 | goto fail; |
ae255e52 PB |
298 | } |
299 | } | |
300 | ||
301 | /* There's no need for a mutex on the receive side, because the | |
302 | * handler acts as a synchronization point and ensures that only | |
303 | * one coroutine is called until the reply finishes. */ | |
ecda3447 | 304 | i = HANDLE_TO_INDEX(s, s->reply.handle); |
dd3e8ac4 PB |
305 | if (i >= MAX_NBD_REQUESTS) { |
306 | goto fail; | |
307 | } | |
308 | ||
ecda3447 PB |
309 | if (s->recv_coroutine[i]) { |
310 | qemu_coroutine_enter(s->recv_coroutine[i], NULL); | |
311 | return; | |
312 | } | |
313 | ||
314 | fail: | |
315 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { | |
316 | if (s->recv_coroutine[i]) { | |
317 | qemu_coroutine_enter(s->recv_coroutine[i], NULL); | |
318 | } | |
ae255e52 PB |
319 | } |
320 | } | |
321 | ||
322 | static void nbd_restart_write(void *opaque) | |
323 | { | |
324 | BDRVNBDState *s = opaque; | |
ecda3447 | 325 | qemu_coroutine_enter(s->send_coroutine, NULL); |
ae255e52 PB |
326 | } |
327 | ||
328 | static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request, | |
2fc8ae1d | 329 | QEMUIOVector *qiov, int offset) |
ae255e52 PB |
330 | { |
331 | int rc, ret; | |
332 | ||
ecda3447 PB |
333 | qemu_co_mutex_lock(&s->send_mutex); |
334 | s->send_coroutine = qemu_coroutine_self(); | |
ae255e52 | 335 | qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write, |
bafbd6a1 | 336 | nbd_have_request, s); |
ae255e52 | 337 | rc = nbd_send_request(s->sock, request); |
2fc8ae1d MT |
338 | if (rc >= 0 && qiov) { |
339 | ret = qemu_co_sendv(s->sock, qiov->iov, qiov->niov, | |
340 | offset, request->len); | |
ae255e52 | 341 | if (ret != request->len) { |
185b4338 | 342 | return -EIO; |
ae255e52 PB |
343 | } |
344 | } | |
345 | qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, NULL, | |
bafbd6a1 | 346 | nbd_have_request, s); |
ecda3447 PB |
347 | s->send_coroutine = NULL; |
348 | qemu_co_mutex_unlock(&s->send_mutex); | |
ae255e52 PB |
349 | return rc; |
350 | } | |
351 | ||
352 | static void nbd_co_receive_reply(BDRVNBDState *s, struct nbd_request *request, | |
353 | struct nbd_reply *reply, | |
2fc8ae1d | 354 | QEMUIOVector *qiov, int offset) |
ae255e52 PB |
355 | { |
356 | int ret; | |
357 | ||
ecda3447 PB |
358 | /* Wait until we're woken up by the read handler. TODO: perhaps |
359 | * peek at the next reply and avoid yielding if it's ours? */ | |
ae255e52 PB |
360 | qemu_coroutine_yield(); |
361 | *reply = s->reply; | |
362 | if (reply->handle != request->handle) { | |
363 | reply->error = EIO; | |
364 | } else { | |
2fc8ae1d MT |
365 | if (qiov && reply->error == 0) { |
366 | ret = qemu_co_recvv(s->sock, qiov->iov, qiov->niov, | |
367 | offset, request->len); | |
ae255e52 PB |
368 | if (ret != request->len) { |
369 | reply->error = EIO; | |
370 | } | |
371 | } | |
372 | ||
373 | /* Tell the read handler to read another header. */ | |
374 | s->reply.handle = 0; | |
375 | } | |
376 | } | |
377 | ||
378 | static void nbd_coroutine_end(BDRVNBDState *s, struct nbd_request *request) | |
379 | { | |
ecda3447 PB |
380 | int i = HANDLE_TO_INDEX(s, request->handle); |
381 | s->recv_coroutine[i] = NULL; | |
382 | if (s->in_flight-- == MAX_NBD_REQUESTS) { | |
383 | qemu_co_mutex_unlock(&s->free_sema); | |
384 | } | |
ae255e52 PB |
385 | } |
386 | ||
33897dc7 NT |
387 | static int nbd_establish_connection(BlockDriverState *bs) |
388 | { | |
389 | BDRVNBDState *s = bs->opaque; | |
390 | int sock; | |
391 | int ret; | |
392 | off_t size; | |
393 | size_t blocksize; | |
75818250 | 394 | |
d04b0bbb | 395 | if (s->is_unix) { |
f53a1feb | 396 | sock = unix_socket_outgoing(qemu_opt_get(s->socket_opts, "path")); |
33897dc7 | 397 | } else { |
f53a1feb | 398 | sock = tcp_socket_outgoing_opts(s->socket_opts); |
75818250 TS |
399 | } |
400 | ||
33897dc7 | 401 | /* Failed to establish connection */ |
fc19f8a0 | 402 | if (sock < 0) { |
33897dc7 NT |
403 | logout("Failed to establish connection to NBD server\n"); |
404 | return -errno; | |
1d45f8b5 | 405 | } |
75818250 | 406 | |
33897dc7 | 407 | /* NBD handshake */ |
b90fb4b8 | 408 | ret = nbd_receive_negotiate(sock, s->export_name, &s->nbdflags, &size, |
33897dc7 | 409 | &blocksize); |
fc19f8a0 | 410 | if (ret < 0) { |
33897dc7 NT |
411 | logout("Failed to negotiate with the NBD server\n"); |
412 | closesocket(sock); | |
185b4338 | 413 | return ret; |
1d45f8b5 | 414 | } |
75818250 | 415 | |
ae255e52 PB |
416 | /* Now that we're connected, set the socket to be non-blocking and |
417 | * kick the reply mechanism. */ | |
f9e8cacc | 418 | qemu_set_nonblock(sock); |
b3adf53a | 419 | qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL, |
bafbd6a1 | 420 | nbd_have_request, s); |
33897dc7 | 421 | |
75818250 TS |
422 | s->sock = sock; |
423 | s->size = size; | |
424 | s->blocksize = blocksize; | |
425 | ||
33897dc7 NT |
426 | logout("Established connection with NBD server\n"); |
427 | return 0; | |
428 | } | |
429 | ||
430 | static void nbd_teardown_connection(BlockDriverState *bs) | |
431 | { | |
432 | BDRVNBDState *s = bs->opaque; | |
433 | struct nbd_request request; | |
434 | ||
435 | request.type = NBD_CMD_DISC; | |
33897dc7 NT |
436 | request.from = 0; |
437 | request.len = 0; | |
438 | nbd_send_request(s->sock, &request); | |
439 | ||
bafbd6a1 | 440 | qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL, NULL); |
33897dc7 NT |
441 | closesocket(s->sock); |
442 | } | |
443 | ||
787e4a85 KW |
444 | static int nbd_open(BlockDriverState *bs, const char* filename, |
445 | QDict *options, int flags) | |
33897dc7 NT |
446 | { |
447 | BDRVNBDState *s = bs->opaque; | |
448 | int result; | |
449 | ||
ecda3447 PB |
450 | qemu_co_mutex_init(&s->send_mutex); |
451 | qemu_co_mutex_init(&s->free_sema); | |
ae255e52 | 452 | |
33897dc7 | 453 | /* Pop the config into our state object. Exit if invalid. */ |
f53a1feb | 454 | result = nbd_config(s, options); |
33897dc7 NT |
455 | if (result != 0) { |
456 | return result; | |
457 | } | |
458 | ||
459 | /* establish TCP connection, return error if it fails | |
460 | * TODO: Configurable retry-until-timeout behaviour. | |
461 | */ | |
462 | result = nbd_establish_connection(bs); | |
463 | ||
464 | return result; | |
75818250 TS |
465 | } |
466 | ||
d9b09f13 PB |
467 | static int nbd_co_readv_1(BlockDriverState *bs, int64_t sector_num, |
468 | int nb_sectors, QEMUIOVector *qiov, | |
469 | int offset) | |
75818250 TS |
470 | { |
471 | BDRVNBDState *s = bs->opaque; | |
472 | struct nbd_request request; | |
473 | struct nbd_reply reply; | |
fc19f8a0 | 474 | ssize_t ret; |
75818250 TS |
475 | |
476 | request.type = NBD_CMD_READ; | |
3a93113a | 477 | request.from = sector_num * 512; |
75818250 TS |
478 | request.len = nb_sectors * 512; |
479 | ||
ae255e52 | 480 | nbd_coroutine_start(s, &request); |
fc19f8a0 PB |
481 | ret = nbd_co_send_request(s, &request, NULL, 0); |
482 | if (ret < 0) { | |
185b4338 | 483 | reply.error = -ret; |
ae255e52 | 484 | } else { |
2fc8ae1d | 485 | nbd_co_receive_reply(s, &request, &reply, qiov, offset); |
ae255e52 PB |
486 | } |
487 | nbd_coroutine_end(s, &request); | |
488 | return -reply.error; | |
75818250 | 489 | |
75818250 TS |
490 | } |
491 | ||
d9b09f13 PB |
492 | static int nbd_co_writev_1(BlockDriverState *bs, int64_t sector_num, |
493 | int nb_sectors, QEMUIOVector *qiov, | |
494 | int offset) | |
75818250 TS |
495 | { |
496 | BDRVNBDState *s = bs->opaque; | |
497 | struct nbd_request request; | |
498 | struct nbd_reply reply; | |
fc19f8a0 | 499 | ssize_t ret; |
75818250 TS |
500 | |
501 | request.type = NBD_CMD_WRITE; | |
2c7989a9 PB |
502 | if (!bdrv_enable_write_cache(bs) && (s->nbdflags & NBD_FLAG_SEND_FUA)) { |
503 | request.type |= NBD_CMD_FLAG_FUA; | |
504 | } | |
505 | ||
3a93113a | 506 | request.from = sector_num * 512; |
75818250 TS |
507 | request.len = nb_sectors * 512; |
508 | ||
ae255e52 | 509 | nbd_coroutine_start(s, &request); |
2fc8ae1d | 510 | ret = nbd_co_send_request(s, &request, qiov, offset); |
fc19f8a0 | 511 | if (ret < 0) { |
185b4338 | 512 | reply.error = -ret; |
ae255e52 PB |
513 | } else { |
514 | nbd_co_receive_reply(s, &request, &reply, NULL, 0); | |
515 | } | |
516 | nbd_coroutine_end(s, &request); | |
517 | return -reply.error; | |
e183ef75 PB |
518 | } |
519 | ||
d9b09f13 PB |
520 | /* qemu-nbd has a limit of slightly less than 1M per request. Try to |
521 | * remain aligned to 4K. */ | |
522 | #define NBD_MAX_SECTORS 2040 | |
523 | ||
524 | static int nbd_co_readv(BlockDriverState *bs, int64_t sector_num, | |
525 | int nb_sectors, QEMUIOVector *qiov) | |
526 | { | |
527 | int offset = 0; | |
528 | int ret; | |
529 | while (nb_sectors > NBD_MAX_SECTORS) { | |
530 | ret = nbd_co_readv_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset); | |
531 | if (ret < 0) { | |
532 | return ret; | |
533 | } | |
534 | offset += NBD_MAX_SECTORS * 512; | |
535 | sector_num += NBD_MAX_SECTORS; | |
536 | nb_sectors -= NBD_MAX_SECTORS; | |
537 | } | |
538 | return nbd_co_readv_1(bs, sector_num, nb_sectors, qiov, offset); | |
539 | } | |
540 | ||
541 | static int nbd_co_writev(BlockDriverState *bs, int64_t sector_num, | |
542 | int nb_sectors, QEMUIOVector *qiov) | |
543 | { | |
544 | int offset = 0; | |
545 | int ret; | |
546 | while (nb_sectors > NBD_MAX_SECTORS) { | |
547 | ret = nbd_co_writev_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset); | |
548 | if (ret < 0) { | |
549 | return ret; | |
550 | } | |
551 | offset += NBD_MAX_SECTORS * 512; | |
552 | sector_num += NBD_MAX_SECTORS; | |
553 | nb_sectors -= NBD_MAX_SECTORS; | |
554 | } | |
555 | return nbd_co_writev_1(bs, sector_num, nb_sectors, qiov, offset); | |
556 | } | |
557 | ||
1486d04a PB |
558 | static int nbd_co_flush(BlockDriverState *bs) |
559 | { | |
560 | BDRVNBDState *s = bs->opaque; | |
561 | struct nbd_request request; | |
562 | struct nbd_reply reply; | |
fc19f8a0 | 563 | ssize_t ret; |
1486d04a PB |
564 | |
565 | if (!(s->nbdflags & NBD_FLAG_SEND_FLUSH)) { | |
566 | return 0; | |
567 | } | |
568 | ||
569 | request.type = NBD_CMD_FLUSH; | |
570 | if (s->nbdflags & NBD_FLAG_SEND_FUA) { | |
571 | request.type |= NBD_CMD_FLAG_FUA; | |
572 | } | |
573 | ||
574 | request.from = 0; | |
575 | request.len = 0; | |
576 | ||
577 | nbd_coroutine_start(s, &request); | |
fc19f8a0 PB |
578 | ret = nbd_co_send_request(s, &request, NULL, 0); |
579 | if (ret < 0) { | |
185b4338 | 580 | reply.error = -ret; |
1486d04a PB |
581 | } else { |
582 | nbd_co_receive_reply(s, &request, &reply, NULL, 0); | |
583 | } | |
584 | nbd_coroutine_end(s, &request); | |
585 | return -reply.error; | |
586 | } | |
587 | ||
7a706633 PB |
588 | static int nbd_co_discard(BlockDriverState *bs, int64_t sector_num, |
589 | int nb_sectors) | |
590 | { | |
591 | BDRVNBDState *s = bs->opaque; | |
592 | struct nbd_request request; | |
593 | struct nbd_reply reply; | |
fc19f8a0 | 594 | ssize_t ret; |
7a706633 PB |
595 | |
596 | if (!(s->nbdflags & NBD_FLAG_SEND_TRIM)) { | |
597 | return 0; | |
598 | } | |
599 | request.type = NBD_CMD_TRIM; | |
600 | request.from = sector_num * 512;; | |
601 | request.len = nb_sectors * 512; | |
602 | ||
603 | nbd_coroutine_start(s, &request); | |
fc19f8a0 PB |
604 | ret = nbd_co_send_request(s, &request, NULL, 0); |
605 | if (ret < 0) { | |
185b4338 | 606 | reply.error = -ret; |
7a706633 PB |
607 | } else { |
608 | nbd_co_receive_reply(s, &request, &reply, NULL, 0); | |
609 | } | |
610 | nbd_coroutine_end(s, &request); | |
611 | return -reply.error; | |
612 | } | |
613 | ||
75818250 TS |
614 | static void nbd_close(BlockDriverState *bs) |
615 | { | |
d2d979c6 | 616 | BDRVNBDState *s = bs->opaque; |
7267c094 | 617 | g_free(s->export_name); |
f53a1feb | 618 | qemu_opts_del(s->socket_opts); |
d2d979c6 | 619 | |
33897dc7 | 620 | nbd_teardown_connection(bs); |
75818250 TS |
621 | } |
622 | ||
623 | static int64_t nbd_getlength(BlockDriverState *bs) | |
624 | { | |
625 | BDRVNBDState *s = bs->opaque; | |
626 | ||
627 | return s->size; | |
628 | } | |
629 | ||
5efa9d5a | 630 | static BlockDriver bdrv_nbd = { |
1486d04a | 631 | .format_name = "nbd", |
1d7d2a9d PB |
632 | .protocol_name = "nbd", |
633 | .instance_size = sizeof(BDRVNBDState), | |
6963a30d | 634 | .bdrv_parse_filename = nbd_parse_filename, |
1d7d2a9d PB |
635 | .bdrv_file_open = nbd_open, |
636 | .bdrv_co_readv = nbd_co_readv, | |
637 | .bdrv_co_writev = nbd_co_writev, | |
638 | .bdrv_close = nbd_close, | |
639 | .bdrv_co_flush_to_os = nbd_co_flush, | |
640 | .bdrv_co_discard = nbd_co_discard, | |
641 | .bdrv_getlength = nbd_getlength, | |
642 | }; | |
643 | ||
644 | static BlockDriver bdrv_nbd_tcp = { | |
645 | .format_name = "nbd", | |
646 | .protocol_name = "nbd+tcp", | |
647 | .instance_size = sizeof(BDRVNBDState), | |
6963a30d | 648 | .bdrv_parse_filename = nbd_parse_filename, |
1d7d2a9d PB |
649 | .bdrv_file_open = nbd_open, |
650 | .bdrv_co_readv = nbd_co_readv, | |
651 | .bdrv_co_writev = nbd_co_writev, | |
652 | .bdrv_close = nbd_close, | |
653 | .bdrv_co_flush_to_os = nbd_co_flush, | |
654 | .bdrv_co_discard = nbd_co_discard, | |
655 | .bdrv_getlength = nbd_getlength, | |
656 | }; | |
657 | ||
658 | static BlockDriver bdrv_nbd_unix = { | |
659 | .format_name = "nbd", | |
660 | .protocol_name = "nbd+unix", | |
1486d04a | 661 | .instance_size = sizeof(BDRVNBDState), |
6963a30d | 662 | .bdrv_parse_filename = nbd_parse_filename, |
1486d04a PB |
663 | .bdrv_file_open = nbd_open, |
664 | .bdrv_co_readv = nbd_co_readv, | |
665 | .bdrv_co_writev = nbd_co_writev, | |
666 | .bdrv_close = nbd_close, | |
667 | .bdrv_co_flush_to_os = nbd_co_flush, | |
7a706633 | 668 | .bdrv_co_discard = nbd_co_discard, |
1486d04a | 669 | .bdrv_getlength = nbd_getlength, |
75818250 | 670 | }; |
5efa9d5a AL |
671 | |
672 | static void bdrv_nbd_init(void) | |
673 | { | |
674 | bdrv_register(&bdrv_nbd); | |
1d7d2a9d PB |
675 | bdrv_register(&bdrv_nbd_tcp); |
676 | bdrv_register(&bdrv_nbd_unix); | |
5efa9d5a AL |
677 | } |
678 | ||
679 | block_init(bdrv_nbd_init); |