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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 { |
23307908 | 121 | QString *host; |
bebbf7fa | 122 | /* nbd[+tcp]://host[:port]/export */ |
1d7d2a9d PB |
123 | if (!uri->server) { |
124 | ret = -EINVAL; | |
125 | goto out; | |
126 | } | |
f17c90be | 127 | |
23307908 JT |
128 | /* strip braces from literal IPv6 address */ |
129 | if (uri->server[0] == '[') { | |
130 | host = qstring_from_substr(uri->server, 1, | |
131 | strlen(uri->server) - 2); | |
132 | } else { | |
133 | host = qstring_from_str(uri->server); | |
134 | } | |
135 | ||
136 | qdict_put(options, "host", host); | |
bebbf7fa KW |
137 | if (uri->port) { |
138 | char* port_str = g_strdup_printf("%d", uri->port); | |
139 | qdict_put(options, "port", qstring_from_str(port_str)); | |
140 | g_free(port_str); | |
141 | } | |
1d7d2a9d PB |
142 | } |
143 | ||
144 | out: | |
145 | if (qp) { | |
146 | query_params_free(qp); | |
147 | } | |
148 | uri_free(uri); | |
149 | return ret; | |
150 | } | |
151 | ||
6963a30d KW |
152 | static void nbd_parse_filename(const char *filename, QDict *options, |
153 | Error **errp) | |
75818250 | 154 | { |
1d45f8b5 | 155 | char *file; |
33897dc7 NT |
156 | char *export_name; |
157 | const char *host_spec; | |
75818250 | 158 | const char *unixpath; |
75818250 | 159 | |
681e7ad0 KW |
160 | if (qdict_haskey(options, "host") |
161 | || qdict_haskey(options, "port") | |
162 | || qdict_haskey(options, "path")) | |
163 | { | |
164 | error_setg(errp, "host/port/path and a file name may not be specified " | |
165 | "at the same time"); | |
166 | return; | |
167 | } | |
168 | ||
1d7d2a9d | 169 | if (strstr(filename, "://")) { |
6963a30d KW |
170 | int ret = nbd_parse_uri(filename, options); |
171 | if (ret < 0) { | |
172 | error_setg(errp, "No valid URL specified"); | |
173 | } | |
174 | return; | |
1d7d2a9d PB |
175 | } |
176 | ||
7267c094 | 177 | file = g_strdup(filename); |
1d45f8b5 | 178 | |
33897dc7 NT |
179 | export_name = strstr(file, EN_OPTSTR); |
180 | if (export_name) { | |
181 | if (export_name[strlen(EN_OPTSTR)] == 0) { | |
1d45f8b5 LV |
182 | goto out; |
183 | } | |
33897dc7 NT |
184 | export_name[0] = 0; /* truncate 'file' */ |
185 | export_name += strlen(EN_OPTSTR); | |
f53a1feb KW |
186 | |
187 | qdict_put(options, "export", qstring_from_str(export_name)); | |
1d45f8b5 LV |
188 | } |
189 | ||
33897dc7 NT |
190 | /* extract the host_spec - fail if it's not nbd:... */ |
191 | if (!strstart(file, "nbd:", &host_spec)) { | |
6963a30d | 192 | error_setg(errp, "File name string for NBD must start with 'nbd:'"); |
1d45f8b5 LV |
193 | goto out; |
194 | } | |
75818250 | 195 | |
f53a1feb | 196 | if (!*host_spec) { |
f53a1feb KW |
197 | goto out; |
198 | } | |
199 | ||
33897dc7 NT |
200 | /* are we a UNIX or TCP socket? */ |
201 | if (strstart(host_spec, "unix:", &unixpath)) { | |
f53a1feb | 202 | qdict_put(options, "path", qstring_from_str(unixpath)); |
75818250 | 203 | } else { |
f53a1feb KW |
204 | InetSocketAddress *addr = NULL; |
205 | ||
6963a30d KW |
206 | addr = inet_parse(host_spec, errp); |
207 | if (error_is_set(errp)) { | |
f17c90be KW |
208 | goto out; |
209 | } | |
75818250 | 210 | |
f53a1feb KW |
211 | qdict_put(options, "host", qstring_from_str(addr->host)); |
212 | qdict_put(options, "port", qstring_from_str(addr->port)); | |
213 | qapi_free_InetSocketAddress(addr); | |
214 | } | |
75818250 | 215 | |
33897dc7 | 216 | out: |
7267c094 | 217 | g_free(file); |
f53a1feb KW |
218 | } |
219 | ||
220 | static int nbd_config(BDRVNBDState *s, QDict *options) | |
221 | { | |
222 | Error *local_err = NULL; | |
223 | ||
224 | if (qdict_haskey(options, "path")) { | |
681e7ad0 KW |
225 | if (qdict_haskey(options, "host")) { |
226 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "path and host may not " | |
227 | "be used at the same time."); | |
228 | return -EINVAL; | |
229 | } | |
f53a1feb KW |
230 | s->is_unix = true; |
231 | } else if (qdict_haskey(options, "host")) { | |
232 | s->is_unix = false; | |
233 | } else { | |
234 | return -EINVAL; | |
33897dc7 | 235 | } |
f53a1feb KW |
236 | |
237 | s->socket_opts = qemu_opts_create_nofail(&socket_optslist); | |
238 | ||
239 | qemu_opts_absorb_qdict(s->socket_opts, options, &local_err); | |
240 | if (error_is_set(&local_err)) { | |
241 | qerror_report_err(local_err); | |
242 | error_free(local_err); | |
243 | return -EINVAL; | |
244 | } | |
245 | ||
bebbf7fa KW |
246 | if (!qemu_opt_get(s->socket_opts, "port")) { |
247 | qemu_opt_set_number(s->socket_opts, "port", NBD_DEFAULT_PORT); | |
248 | } | |
249 | ||
f53a1feb KW |
250 | s->export_name = g_strdup(qdict_get_try_str(options, "export")); |
251 | if (s->export_name) { | |
252 | qdict_del(options, "export"); | |
253 | } | |
254 | ||
255 | return 0; | |
33897dc7 | 256 | } |
1d45f8b5 | 257 | |
f53a1feb | 258 | |
ae255e52 PB |
259 | static void nbd_coroutine_start(BDRVNBDState *s, struct nbd_request *request) |
260 | { | |
ecda3447 PB |
261 | int i; |
262 | ||
263 | /* Poor man semaphore. The free_sema is locked when no other request | |
264 | * can be accepted, and unlocked after receiving one reply. */ | |
265 | if (s->in_flight >= MAX_NBD_REQUESTS - 1) { | |
266 | qemu_co_mutex_lock(&s->free_sema); | |
267 | assert(s->in_flight < MAX_NBD_REQUESTS); | |
268 | } | |
269 | s->in_flight++; | |
270 | ||
271 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { | |
272 | if (s->recv_coroutine[i] == NULL) { | |
273 | s->recv_coroutine[i] = qemu_coroutine_self(); | |
274 | break; | |
275 | } | |
276 | } | |
277 | ||
278 | assert(i < MAX_NBD_REQUESTS); | |
279 | request->handle = INDEX_TO_HANDLE(s, i); | |
ae255e52 PB |
280 | } |
281 | ||
282 | static int nbd_have_request(void *opaque) | |
283 | { | |
284 | BDRVNBDState *s = opaque; | |
285 | ||
ecda3447 | 286 | return s->in_flight > 0; |
ae255e52 PB |
287 | } |
288 | ||
289 | static void nbd_reply_ready(void *opaque) | |
290 | { | |
291 | BDRVNBDState *s = opaque; | |
dd3e8ac4 | 292 | uint64_t i; |
7fe7b68b | 293 | int ret; |
ae255e52 PB |
294 | |
295 | if (s->reply.handle == 0) { | |
7fe7b68b PB |
296 | /* No reply already in flight. Fetch a header. It is possible |
297 | * that another thread has done the same thing in parallel, so | |
298 | * the socket is not readable anymore. | |
299 | */ | |
300 | ret = nbd_receive_reply(s->sock, &s->reply); | |
301 | if (ret == -EAGAIN) { | |
302 | return; | |
303 | } | |
304 | if (ret < 0) { | |
ae255e52 | 305 | s->reply.handle = 0; |
ecda3447 | 306 | goto fail; |
ae255e52 PB |
307 | } |
308 | } | |
309 | ||
310 | /* There's no need for a mutex on the receive side, because the | |
311 | * handler acts as a synchronization point and ensures that only | |
312 | * one coroutine is called until the reply finishes. */ | |
ecda3447 | 313 | i = HANDLE_TO_INDEX(s, s->reply.handle); |
dd3e8ac4 PB |
314 | if (i >= MAX_NBD_REQUESTS) { |
315 | goto fail; | |
316 | } | |
317 | ||
ecda3447 PB |
318 | if (s->recv_coroutine[i]) { |
319 | qemu_coroutine_enter(s->recv_coroutine[i], NULL); | |
320 | return; | |
321 | } | |
322 | ||
323 | fail: | |
324 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { | |
325 | if (s->recv_coroutine[i]) { | |
326 | qemu_coroutine_enter(s->recv_coroutine[i], NULL); | |
327 | } | |
ae255e52 PB |
328 | } |
329 | } | |
330 | ||
331 | static void nbd_restart_write(void *opaque) | |
332 | { | |
333 | BDRVNBDState *s = opaque; | |
ecda3447 | 334 | qemu_coroutine_enter(s->send_coroutine, NULL); |
ae255e52 PB |
335 | } |
336 | ||
337 | static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request, | |
2fc8ae1d | 338 | QEMUIOVector *qiov, int offset) |
ae255e52 PB |
339 | { |
340 | int rc, ret; | |
341 | ||
ecda3447 PB |
342 | qemu_co_mutex_lock(&s->send_mutex); |
343 | s->send_coroutine = qemu_coroutine_self(); | |
ae255e52 | 344 | qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write, |
bafbd6a1 | 345 | nbd_have_request, s); |
0fcece25 SH |
346 | if (qiov) { |
347 | if (!s->is_unix) { | |
348 | socket_set_cork(s->sock, 1); | |
ae255e52 | 349 | } |
0fcece25 SH |
350 | rc = nbd_send_request(s->sock, request); |
351 | if (rc >= 0) { | |
352 | ret = qemu_co_sendv(s->sock, qiov->iov, qiov->niov, | |
353 | offset, request->len); | |
354 | if (ret != request->len) { | |
355 | rc = -EIO; | |
356 | } | |
357 | } | |
358 | if (!s->is_unix) { | |
359 | socket_set_cork(s->sock, 0); | |
360 | } | |
361 | } else { | |
362 | rc = nbd_send_request(s->sock, request); | |
ae255e52 PB |
363 | } |
364 | qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, NULL, | |
bafbd6a1 | 365 | nbd_have_request, s); |
ecda3447 PB |
366 | s->send_coroutine = NULL; |
367 | qemu_co_mutex_unlock(&s->send_mutex); | |
ae255e52 PB |
368 | return rc; |
369 | } | |
370 | ||
371 | static void nbd_co_receive_reply(BDRVNBDState *s, struct nbd_request *request, | |
372 | struct nbd_reply *reply, | |
2fc8ae1d | 373 | QEMUIOVector *qiov, int offset) |
ae255e52 PB |
374 | { |
375 | int ret; | |
376 | ||
ecda3447 PB |
377 | /* Wait until we're woken up by the read handler. TODO: perhaps |
378 | * peek at the next reply and avoid yielding if it's ours? */ | |
ae255e52 PB |
379 | qemu_coroutine_yield(); |
380 | *reply = s->reply; | |
381 | if (reply->handle != request->handle) { | |
382 | reply->error = EIO; | |
383 | } else { | |
2fc8ae1d MT |
384 | if (qiov && reply->error == 0) { |
385 | ret = qemu_co_recvv(s->sock, qiov->iov, qiov->niov, | |
386 | offset, request->len); | |
ae255e52 PB |
387 | if (ret != request->len) { |
388 | reply->error = EIO; | |
389 | } | |
390 | } | |
391 | ||
392 | /* Tell the read handler to read another header. */ | |
393 | s->reply.handle = 0; | |
394 | } | |
395 | } | |
396 | ||
397 | static void nbd_coroutine_end(BDRVNBDState *s, struct nbd_request *request) | |
398 | { | |
ecda3447 PB |
399 | int i = HANDLE_TO_INDEX(s, request->handle); |
400 | s->recv_coroutine[i] = NULL; | |
401 | if (s->in_flight-- == MAX_NBD_REQUESTS) { | |
402 | qemu_co_mutex_unlock(&s->free_sema); | |
403 | } | |
ae255e52 PB |
404 | } |
405 | ||
33897dc7 NT |
406 | static int nbd_establish_connection(BlockDriverState *bs) |
407 | { | |
408 | BDRVNBDState *s = bs->opaque; | |
409 | int sock; | |
410 | int ret; | |
411 | off_t size; | |
412 | size_t blocksize; | |
75818250 | 413 | |
d04b0bbb | 414 | if (s->is_unix) { |
f53a1feb | 415 | sock = unix_socket_outgoing(qemu_opt_get(s->socket_opts, "path")); |
33897dc7 | 416 | } else { |
f53a1feb | 417 | sock = tcp_socket_outgoing_opts(s->socket_opts); |
97ebbab0 SH |
418 | if (sock >= 0) { |
419 | socket_set_nodelay(sock); | |
420 | } | |
75818250 TS |
421 | } |
422 | ||
33897dc7 | 423 | /* Failed to establish connection */ |
fc19f8a0 | 424 | if (sock < 0) { |
33897dc7 NT |
425 | logout("Failed to establish connection to NBD server\n"); |
426 | return -errno; | |
1d45f8b5 | 427 | } |
75818250 | 428 | |
33897dc7 | 429 | /* NBD handshake */ |
b90fb4b8 | 430 | ret = nbd_receive_negotiate(sock, s->export_name, &s->nbdflags, &size, |
33897dc7 | 431 | &blocksize); |
fc19f8a0 | 432 | if (ret < 0) { |
33897dc7 NT |
433 | logout("Failed to negotiate with the NBD server\n"); |
434 | closesocket(sock); | |
185b4338 | 435 | return ret; |
1d45f8b5 | 436 | } |
75818250 | 437 | |
ae255e52 PB |
438 | /* Now that we're connected, set the socket to be non-blocking and |
439 | * kick the reply mechanism. */ | |
f9e8cacc | 440 | qemu_set_nonblock(sock); |
b3adf53a | 441 | qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL, |
bafbd6a1 | 442 | nbd_have_request, s); |
33897dc7 | 443 | |
75818250 TS |
444 | s->sock = sock; |
445 | s->size = size; | |
446 | s->blocksize = blocksize; | |
447 | ||
33897dc7 NT |
448 | logout("Established connection with NBD server\n"); |
449 | return 0; | |
450 | } | |
451 | ||
452 | static void nbd_teardown_connection(BlockDriverState *bs) | |
453 | { | |
454 | BDRVNBDState *s = bs->opaque; | |
455 | struct nbd_request request; | |
456 | ||
457 | request.type = NBD_CMD_DISC; | |
33897dc7 NT |
458 | request.from = 0; |
459 | request.len = 0; | |
460 | nbd_send_request(s->sock, &request); | |
461 | ||
bafbd6a1 | 462 | qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL, NULL); |
33897dc7 NT |
463 | closesocket(s->sock); |
464 | } | |
465 | ||
56d1b4d2 | 466 | static int nbd_open(BlockDriverState *bs, QDict *options, int flags) |
33897dc7 NT |
467 | { |
468 | BDRVNBDState *s = bs->opaque; | |
469 | int result; | |
470 | ||
ecda3447 PB |
471 | qemu_co_mutex_init(&s->send_mutex); |
472 | qemu_co_mutex_init(&s->free_sema); | |
ae255e52 | 473 | |
33897dc7 | 474 | /* Pop the config into our state object. Exit if invalid. */ |
f53a1feb | 475 | result = nbd_config(s, options); |
33897dc7 NT |
476 | if (result != 0) { |
477 | return result; | |
478 | } | |
479 | ||
480 | /* establish TCP connection, return error if it fails | |
481 | * TODO: Configurable retry-until-timeout behaviour. | |
482 | */ | |
483 | result = nbd_establish_connection(bs); | |
484 | ||
485 | return result; | |
75818250 TS |
486 | } |
487 | ||
d9b09f13 PB |
488 | static int nbd_co_readv_1(BlockDriverState *bs, int64_t sector_num, |
489 | int nb_sectors, QEMUIOVector *qiov, | |
490 | int offset) | |
75818250 TS |
491 | { |
492 | BDRVNBDState *s = bs->opaque; | |
493 | struct nbd_request request; | |
494 | struct nbd_reply reply; | |
fc19f8a0 | 495 | ssize_t ret; |
75818250 TS |
496 | |
497 | request.type = NBD_CMD_READ; | |
3a93113a | 498 | request.from = sector_num * 512; |
75818250 TS |
499 | request.len = nb_sectors * 512; |
500 | ||
ae255e52 | 501 | nbd_coroutine_start(s, &request); |
fc19f8a0 PB |
502 | ret = nbd_co_send_request(s, &request, NULL, 0); |
503 | if (ret < 0) { | |
185b4338 | 504 | reply.error = -ret; |
ae255e52 | 505 | } else { |
2fc8ae1d | 506 | nbd_co_receive_reply(s, &request, &reply, qiov, offset); |
ae255e52 PB |
507 | } |
508 | nbd_coroutine_end(s, &request); | |
509 | return -reply.error; | |
75818250 | 510 | |
75818250 TS |
511 | } |
512 | ||
d9b09f13 PB |
513 | static int nbd_co_writev_1(BlockDriverState *bs, int64_t sector_num, |
514 | int nb_sectors, QEMUIOVector *qiov, | |
515 | int offset) | |
75818250 TS |
516 | { |
517 | BDRVNBDState *s = bs->opaque; | |
518 | struct nbd_request request; | |
519 | struct nbd_reply reply; | |
fc19f8a0 | 520 | ssize_t ret; |
75818250 TS |
521 | |
522 | request.type = NBD_CMD_WRITE; | |
2c7989a9 PB |
523 | if (!bdrv_enable_write_cache(bs) && (s->nbdflags & NBD_FLAG_SEND_FUA)) { |
524 | request.type |= NBD_CMD_FLAG_FUA; | |
525 | } | |
526 | ||
3a93113a | 527 | request.from = sector_num * 512; |
75818250 TS |
528 | request.len = nb_sectors * 512; |
529 | ||
ae255e52 | 530 | nbd_coroutine_start(s, &request); |
2fc8ae1d | 531 | ret = nbd_co_send_request(s, &request, qiov, offset); |
fc19f8a0 | 532 | if (ret < 0) { |
185b4338 | 533 | reply.error = -ret; |
ae255e52 PB |
534 | } else { |
535 | nbd_co_receive_reply(s, &request, &reply, NULL, 0); | |
536 | } | |
537 | nbd_coroutine_end(s, &request); | |
538 | return -reply.error; | |
e183ef75 PB |
539 | } |
540 | ||
d9b09f13 PB |
541 | /* qemu-nbd has a limit of slightly less than 1M per request. Try to |
542 | * remain aligned to 4K. */ | |
543 | #define NBD_MAX_SECTORS 2040 | |
544 | ||
545 | static int nbd_co_readv(BlockDriverState *bs, int64_t sector_num, | |
546 | int nb_sectors, QEMUIOVector *qiov) | |
547 | { | |
548 | int offset = 0; | |
549 | int ret; | |
550 | while (nb_sectors > NBD_MAX_SECTORS) { | |
551 | ret = nbd_co_readv_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset); | |
552 | if (ret < 0) { | |
553 | return ret; | |
554 | } | |
555 | offset += NBD_MAX_SECTORS * 512; | |
556 | sector_num += NBD_MAX_SECTORS; | |
557 | nb_sectors -= NBD_MAX_SECTORS; | |
558 | } | |
559 | return nbd_co_readv_1(bs, sector_num, nb_sectors, qiov, offset); | |
560 | } | |
561 | ||
562 | static int nbd_co_writev(BlockDriverState *bs, int64_t sector_num, | |
563 | int nb_sectors, QEMUIOVector *qiov) | |
564 | { | |
565 | int offset = 0; | |
566 | int ret; | |
567 | while (nb_sectors > NBD_MAX_SECTORS) { | |
568 | ret = nbd_co_writev_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset); | |
569 | if (ret < 0) { | |
570 | return ret; | |
571 | } | |
572 | offset += NBD_MAX_SECTORS * 512; | |
573 | sector_num += NBD_MAX_SECTORS; | |
574 | nb_sectors -= NBD_MAX_SECTORS; | |
575 | } | |
576 | return nbd_co_writev_1(bs, sector_num, nb_sectors, qiov, offset); | |
577 | } | |
578 | ||
1486d04a PB |
579 | static int nbd_co_flush(BlockDriverState *bs) |
580 | { | |
581 | BDRVNBDState *s = bs->opaque; | |
582 | struct nbd_request request; | |
583 | struct nbd_reply reply; | |
fc19f8a0 | 584 | ssize_t ret; |
1486d04a PB |
585 | |
586 | if (!(s->nbdflags & NBD_FLAG_SEND_FLUSH)) { | |
587 | return 0; | |
588 | } | |
589 | ||
590 | request.type = NBD_CMD_FLUSH; | |
591 | if (s->nbdflags & NBD_FLAG_SEND_FUA) { | |
592 | request.type |= NBD_CMD_FLAG_FUA; | |
593 | } | |
594 | ||
595 | request.from = 0; | |
596 | request.len = 0; | |
597 | ||
598 | nbd_coroutine_start(s, &request); | |
fc19f8a0 PB |
599 | ret = nbd_co_send_request(s, &request, NULL, 0); |
600 | if (ret < 0) { | |
185b4338 | 601 | reply.error = -ret; |
1486d04a PB |
602 | } else { |
603 | nbd_co_receive_reply(s, &request, &reply, NULL, 0); | |
604 | } | |
605 | nbd_coroutine_end(s, &request); | |
606 | return -reply.error; | |
607 | } | |
608 | ||
7a706633 PB |
609 | static int nbd_co_discard(BlockDriverState *bs, int64_t sector_num, |
610 | int nb_sectors) | |
611 | { | |
612 | BDRVNBDState *s = bs->opaque; | |
613 | struct nbd_request request; | |
614 | struct nbd_reply reply; | |
fc19f8a0 | 615 | ssize_t ret; |
7a706633 PB |
616 | |
617 | if (!(s->nbdflags & NBD_FLAG_SEND_TRIM)) { | |
618 | return 0; | |
619 | } | |
620 | request.type = NBD_CMD_TRIM; | |
c7e775e4 | 621 | request.from = sector_num * 512; |
7a706633 PB |
622 | request.len = nb_sectors * 512; |
623 | ||
624 | nbd_coroutine_start(s, &request); | |
fc19f8a0 PB |
625 | ret = nbd_co_send_request(s, &request, NULL, 0); |
626 | if (ret < 0) { | |
185b4338 | 627 | reply.error = -ret; |
7a706633 PB |
628 | } else { |
629 | nbd_co_receive_reply(s, &request, &reply, NULL, 0); | |
630 | } | |
631 | nbd_coroutine_end(s, &request); | |
632 | return -reply.error; | |
633 | } | |
634 | ||
75818250 TS |
635 | static void nbd_close(BlockDriverState *bs) |
636 | { | |
d2d979c6 | 637 | BDRVNBDState *s = bs->opaque; |
7267c094 | 638 | g_free(s->export_name); |
f53a1feb | 639 | qemu_opts_del(s->socket_opts); |
d2d979c6 | 640 | |
33897dc7 | 641 | nbd_teardown_connection(bs); |
75818250 TS |
642 | } |
643 | ||
644 | static int64_t nbd_getlength(BlockDriverState *bs) | |
645 | { | |
646 | BDRVNBDState *s = bs->opaque; | |
647 | ||
648 | return s->size; | |
649 | } | |
650 | ||
5efa9d5a | 651 | static BlockDriver bdrv_nbd = { |
1486d04a | 652 | .format_name = "nbd", |
1d7d2a9d PB |
653 | .protocol_name = "nbd", |
654 | .instance_size = sizeof(BDRVNBDState), | |
6963a30d | 655 | .bdrv_parse_filename = nbd_parse_filename, |
1d7d2a9d PB |
656 | .bdrv_file_open = nbd_open, |
657 | .bdrv_co_readv = nbd_co_readv, | |
658 | .bdrv_co_writev = nbd_co_writev, | |
659 | .bdrv_close = nbd_close, | |
660 | .bdrv_co_flush_to_os = nbd_co_flush, | |
661 | .bdrv_co_discard = nbd_co_discard, | |
662 | .bdrv_getlength = nbd_getlength, | |
663 | }; | |
664 | ||
665 | static BlockDriver bdrv_nbd_tcp = { | |
666 | .format_name = "nbd", | |
667 | .protocol_name = "nbd+tcp", | |
668 | .instance_size = sizeof(BDRVNBDState), | |
6963a30d | 669 | .bdrv_parse_filename = nbd_parse_filename, |
1d7d2a9d PB |
670 | .bdrv_file_open = nbd_open, |
671 | .bdrv_co_readv = nbd_co_readv, | |
672 | .bdrv_co_writev = nbd_co_writev, | |
673 | .bdrv_close = nbd_close, | |
674 | .bdrv_co_flush_to_os = nbd_co_flush, | |
675 | .bdrv_co_discard = nbd_co_discard, | |
676 | .bdrv_getlength = nbd_getlength, | |
677 | }; | |
678 | ||
679 | static BlockDriver bdrv_nbd_unix = { | |
680 | .format_name = "nbd", | |
681 | .protocol_name = "nbd+unix", | |
1486d04a | 682 | .instance_size = sizeof(BDRVNBDState), |
6963a30d | 683 | .bdrv_parse_filename = nbd_parse_filename, |
1486d04a PB |
684 | .bdrv_file_open = nbd_open, |
685 | .bdrv_co_readv = nbd_co_readv, | |
686 | .bdrv_co_writev = nbd_co_writev, | |
687 | .bdrv_close = nbd_close, | |
688 | .bdrv_co_flush_to_os = nbd_co_flush, | |
7a706633 | 689 | .bdrv_co_discard = nbd_co_discard, |
1486d04a | 690 | .bdrv_getlength = nbd_getlength, |
75818250 | 691 | }; |
5efa9d5a AL |
692 | |
693 | static void bdrv_nbd_init(void) | |
694 | { | |
695 | bdrv_register(&bdrv_nbd); | |
1d7d2a9d PB |
696 | bdrv_register(&bdrv_nbd_tcp); |
697 | bdrv_register(&bdrv_nbd_unix); | |
5efa9d5a AL |
698 | } |
699 | ||
700 | block_init(bdrv_nbd_init); |