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2302c1ca MAL |
1 | /* |
2 | * QEMU Block driver for NBD | |
3 | * | |
b626b51a | 4 | * Copyright (C) 2016 Red Hat, Inc. |
2302c1ca MAL |
5 | * Copyright (C) 2008 Bull S.A.S. |
6 | * Author: Laurent Vivier <Laurent.Vivier@bull.net> | |
7 | * | |
8 | * Some parts: | |
9 | * Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws> | |
10 | * | |
11 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
12 | * of this software and associated documentation files (the "Software"), to deal | |
13 | * in the Software without restriction, including without limitation the rights | |
14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
15 | * copies of the Software, and to permit persons to whom the Software is | |
16 | * furnished to do so, subject to the following conditions: | |
17 | * | |
18 | * The above copyright notice and this permission notice shall be included in | |
19 | * all copies or substantial portions of the Software. | |
20 | * | |
21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
24 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
27 | * THE SOFTWARE. | |
28 | */ | |
29 | ||
80c71a24 | 30 | #include "qemu/osdep.h" |
d8b4bad8 VSO |
31 | |
32 | #include "trace.h" | |
be41c100 | 33 | #include "qapi/error.h" |
2302c1ca | 34 | #include "nbd-client.h" |
2302c1ca | 35 | |
cfa3ad63 EB |
36 | #define HANDLE_TO_INDEX(bs, handle) ((handle) ^ (uint64_t)(intptr_t)(bs)) |
37 | #define INDEX_TO_HANDLE(bs, index) ((index) ^ (uint64_t)(intptr_t)(bs)) | |
2302c1ca | 38 | |
07b1b99c | 39 | static void nbd_recv_coroutines_wake_all(NBDClientSession *s) |
69152c09 MAL |
40 | { |
41 | int i; | |
42 | ||
43 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { | |
40f4a218 SH |
44 | NBDClientRequest *req = &s->requests[i]; |
45 | ||
46 | if (req->coroutine && req->receiving) { | |
47 | aio_co_wake(req->coroutine); | |
69152c09 MAL |
48 | } |
49 | } | |
50 | } | |
51 | ||
f53a829b | 52 | static void nbd_teardown_connection(BlockDriverState *bs) |
4a41a2d6 | 53 | { |
10676b81 | 54 | NBDClientSession *client = nbd_get_client_session(bs); |
f53a829b | 55 | |
88ed4e1b | 56 | assert(client->ioc); |
064097d9 | 57 | |
4a41a2d6 | 58 | /* finish any pending coroutines */ |
064097d9 DB |
59 | qio_channel_shutdown(client->ioc, |
60 | QIO_CHANNEL_SHUTDOWN_BOTH, | |
61 | NULL); | |
a12a712a | 62 | BDRV_POLL_WHILE(bs, client->read_reply_co); |
4a41a2d6 | 63 | |
f53a829b | 64 | nbd_client_detach_aio_context(bs); |
064097d9 DB |
65 | object_unref(OBJECT(client->sioc)); |
66 | client->sioc = NULL; | |
67 | object_unref(OBJECT(client->ioc)); | |
68 | client->ioc = NULL; | |
4a41a2d6 SH |
69 | } |
70 | ||
ff82911c | 71 | static coroutine_fn void nbd_read_reply_entry(void *opaque) |
2302c1ca | 72 | { |
ff82911c | 73 | NBDClientSession *s = opaque; |
2302c1ca | 74 | uint64_t i; |
d0a18013 | 75 | int ret = 0; |
be41c100 | 76 | Error *local_err = NULL; |
2302c1ca | 77 | |
72b6ffc7 | 78 | while (!s->quit) { |
ff82911c | 79 | assert(s->reply.handle == 0); |
be41c100 | 80 | ret = nbd_receive_reply(s->ioc, &s->reply, &local_err); |
08ace1d7 | 81 | if (local_err) { |
d8b4bad8 VSO |
82 | trace_nbd_read_reply_entry_fail(ret, error_get_pretty(local_err)); |
83 | error_free(local_err); | |
be41c100 | 84 | } |
a12a712a | 85 | if (ret <= 0) { |
ff82911c | 86 | break; |
2302c1ca | 87 | } |
2302c1ca | 88 | |
ff82911c PB |
89 | /* There's no need for a mutex on the receive side, because the |
90 | * handler acts as a synchronization point and ensures that only | |
91 | * one coroutine is called until the reply finishes. | |
92 | */ | |
93 | i = HANDLE_TO_INDEX(s, s->reply.handle); | |
40f4a218 SH |
94 | if (i >= MAX_NBD_REQUESTS || |
95 | !s->requests[i].coroutine || | |
d2febedb | 96 | !s->requests[i].receiving || |
f140e300 | 97 | (nbd_reply_is_structured(&s->reply) && !s->info.structured_reply)) |
d2febedb | 98 | { |
ff82911c PB |
99 | break; |
100 | } | |
2302c1ca | 101 | |
40f4a218 | 102 | /* We're woken up again by the request itself. Note that there |
ff82911c PB |
103 | * is no race between yielding and reentering read_reply_co. This |
104 | * is because: | |
105 | * | |
40f4a218 | 106 | * - if the request runs on the same AioContext, it is only |
ff82911c PB |
107 | * entered after we yield |
108 | * | |
40f4a218 | 109 | * - if the request runs on a different AioContext, reentering |
ff82911c PB |
110 | * read_reply_co happens through a bottom half, which can only |
111 | * run after we yield. | |
112 | */ | |
40f4a218 | 113 | aio_co_wake(s->requests[i].coroutine); |
ff82911c | 114 | qemu_coroutine_yield(); |
2302c1ca | 115 | } |
a12a712a | 116 | |
40f4a218 | 117 | s->quit = true; |
07b1b99c | 118 | nbd_recv_coroutines_wake_all(s); |
ff82911c | 119 | s->read_reply_co = NULL; |
4720cbee | 120 | aio_wait_kick(); |
2302c1ca MAL |
121 | } |
122 | ||
f53a829b | 123 | static int nbd_co_send_request(BlockDriverState *bs, |
ed2dd912 | 124 | NBDRequest *request, |
1e2a77a8 | 125 | QEMUIOVector *qiov) |
2302c1ca | 126 | { |
10676b81 | 127 | NBDClientSession *s = nbd_get_client_session(bs); |
030fa7f6 | 128 | int rc, i; |
2302c1ca MAL |
129 | |
130 | qemu_co_mutex_lock(&s->send_mutex); | |
6bdcc018 PB |
131 | while (s->in_flight == MAX_NBD_REQUESTS) { |
132 | qemu_co_queue_wait(&s->free_sema, &s->send_mutex); | |
133 | } | |
134 | s->in_flight++; | |
141cabe6 BW |
135 | |
136 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { | |
40f4a218 | 137 | if (s->requests[i].coroutine == NULL) { |
141cabe6 BW |
138 | break; |
139 | } | |
140 | } | |
141 | ||
1c778ef7 | 142 | g_assert(qemu_in_coroutine()); |
141cabe6 | 143 | assert(i < MAX_NBD_REQUESTS); |
40f4a218 SH |
144 | |
145 | s->requests[i].coroutine = qemu_coroutine_self(); | |
f140e300 | 146 | s->requests[i].offset = request->from; |
40f4a218 SH |
147 | s->requests[i].receiving = false; |
148 | ||
141cabe6 | 149 | request->handle = INDEX_TO_HANDLE(s, i); |
064097d9 | 150 | |
72b6ffc7 | 151 | if (s->quit) { |
3c2d5183 SH |
152 | rc = -EIO; |
153 | goto err; | |
72b6ffc7 | 154 | } |
88ed4e1b | 155 | assert(s->ioc); |
064097d9 | 156 | |
2302c1ca | 157 | if (qiov) { |
064097d9 | 158 | qio_channel_set_cork(s->ioc, true); |
1c778ef7 | 159 | rc = nbd_send_request(s->ioc, request); |
72b6ffc7 | 160 | if (rc >= 0 && !s->quit) { |
030fa7f6 EB |
161 | if (qio_channel_writev_all(s->ioc, qiov->iov, qiov->niov, |
162 | NULL) < 0) { | |
2302c1ca MAL |
163 | rc = -EIO; |
164 | } | |
a6934370 VSO |
165 | } else if (rc >= 0) { |
166 | rc = -EIO; | |
2302c1ca | 167 | } |
064097d9 | 168 | qio_channel_set_cork(s->ioc, false); |
2302c1ca | 169 | } else { |
1c778ef7 | 170 | rc = nbd_send_request(s->ioc, request); |
2302c1ca | 171 | } |
3c2d5183 SH |
172 | |
173 | err: | |
72b6ffc7 EB |
174 | if (rc < 0) { |
175 | s->quit = true; | |
3c2d5183 SH |
176 | s->requests[i].coroutine = NULL; |
177 | s->in_flight--; | |
178 | qemu_co_queue_next(&s->free_sema); | |
72b6ffc7 | 179 | } |
2302c1ca MAL |
180 | qemu_co_mutex_unlock(&s->send_mutex); |
181 | return rc; | |
182 | } | |
183 | ||
f140e300 VSO |
184 | static inline uint16_t payload_advance16(uint8_t **payload) |
185 | { | |
186 | *payload += 2; | |
187 | return lduw_be_p(*payload - 2); | |
188 | } | |
189 | ||
190 | static inline uint32_t payload_advance32(uint8_t **payload) | |
191 | { | |
192 | *payload += 4; | |
193 | return ldl_be_p(*payload - 4); | |
194 | } | |
195 | ||
196 | static inline uint64_t payload_advance64(uint8_t **payload) | |
197 | { | |
198 | *payload += 8; | |
199 | return ldq_be_p(*payload - 8); | |
200 | } | |
201 | ||
202 | static int nbd_parse_offset_hole_payload(NBDStructuredReplyChunk *chunk, | |
203 | uint8_t *payload, uint64_t orig_offset, | |
204 | QEMUIOVector *qiov, Error **errp) | |
205 | { | |
206 | uint64_t offset; | |
207 | uint32_t hole_size; | |
208 | ||
209 | if (chunk->length != sizeof(offset) + sizeof(hole_size)) { | |
210 | error_setg(errp, "Protocol error: invalid payload for " | |
211 | "NBD_REPLY_TYPE_OFFSET_HOLE"); | |
212 | return -EINVAL; | |
213 | } | |
214 | ||
215 | offset = payload_advance64(&payload); | |
216 | hole_size = payload_advance32(&payload); | |
217 | ||
b4176cb3 | 218 | if (!hole_size || offset < orig_offset || hole_size > qiov->size || |
f140e300 VSO |
219 | offset > orig_offset + qiov->size - hole_size) { |
220 | error_setg(errp, "Protocol error: server sent chunk exceeding requested" | |
221 | " region"); | |
222 | return -EINVAL; | |
223 | } | |
224 | ||
225 | qemu_iovec_memset(qiov, offset - orig_offset, 0, hole_size); | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
78a33ab5 VSO |
230 | /* nbd_parse_blockstatus_payload |
231 | * support only one extent in reply and only for | |
232 | * base:allocation context | |
233 | */ | |
234 | static int nbd_parse_blockstatus_payload(NBDClientSession *client, | |
235 | NBDStructuredReplyChunk *chunk, | |
236 | uint8_t *payload, uint64_t orig_length, | |
237 | NBDExtent *extent, Error **errp) | |
238 | { | |
239 | uint32_t context_id; | |
240 | ||
00d96a46 | 241 | if (chunk->length != sizeof(context_id) + sizeof(*extent)) { |
78a33ab5 VSO |
242 | error_setg(errp, "Protocol error: invalid payload for " |
243 | "NBD_REPLY_TYPE_BLOCK_STATUS"); | |
244 | return -EINVAL; | |
245 | } | |
246 | ||
247 | context_id = payload_advance32(&payload); | |
2df94eb5 | 248 | if (client->info.context_id != context_id) { |
78a33ab5 VSO |
249 | error_setg(errp, "Protocol error: unexpected context id %d for " |
250 | "NBD_REPLY_TYPE_BLOCK_STATUS, when negotiated context " | |
251 | "id is %d", context_id, | |
2df94eb5 | 252 | client->info.context_id); |
78a33ab5 VSO |
253 | return -EINVAL; |
254 | } | |
255 | ||
256 | extent->length = payload_advance32(&payload); | |
257 | extent->flags = payload_advance32(&payload); | |
258 | ||
259 | if (extent->length == 0 || | |
260 | (client->info.min_block && !QEMU_IS_ALIGNED(extent->length, | |
acfd8f7a | 261 | client->info.min_block))) { |
78a33ab5 VSO |
262 | error_setg(errp, "Protocol error: server sent status chunk with " |
263 | "invalid length"); | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
acfd8f7a EB |
267 | /* The server is allowed to send us extra information on the final |
268 | * extent; just clamp it to the length we requested. */ | |
269 | if (extent->length > orig_length) { | |
270 | extent->length = orig_length; | |
271 | } | |
272 | ||
78a33ab5 VSO |
273 | return 0; |
274 | } | |
275 | ||
f140e300 VSO |
276 | /* nbd_parse_error_payload |
277 | * on success @errp contains message describing nbd error reply | |
278 | */ | |
279 | static int nbd_parse_error_payload(NBDStructuredReplyChunk *chunk, | |
280 | uint8_t *payload, int *request_ret, | |
281 | Error **errp) | |
282 | { | |
283 | uint32_t error; | |
284 | uint16_t message_size; | |
285 | ||
286 | assert(chunk->type & (1 << 15)); | |
287 | ||
288 | if (chunk->length < sizeof(error) + sizeof(message_size)) { | |
289 | error_setg(errp, | |
290 | "Protocol error: invalid payload for structured error"); | |
291 | return -EINVAL; | |
292 | } | |
293 | ||
294 | error = nbd_errno_to_system_errno(payload_advance32(&payload)); | |
295 | if (error == 0) { | |
e659fb3b | 296 | error_setg(errp, "Protocol error: server sent structured error chunk " |
f140e300 VSO |
297 | "with error = 0"); |
298 | return -EINVAL; | |
299 | } | |
300 | ||
301 | *request_ret = -error; | |
302 | message_size = payload_advance16(&payload); | |
303 | ||
304 | if (message_size > chunk->length - sizeof(error) - sizeof(message_size)) { | |
e659fb3b | 305 | error_setg(errp, "Protocol error: server sent structured error chunk " |
f140e300 VSO |
306 | "with incorrect message size"); |
307 | return -EINVAL; | |
308 | } | |
309 | ||
310 | /* TODO: Add a trace point to mention the server complaint */ | |
311 | ||
312 | /* TODO handle ERROR_OFFSET */ | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static int nbd_co_receive_offset_data_payload(NBDClientSession *s, | |
318 | uint64_t orig_offset, | |
319 | QEMUIOVector *qiov, Error **errp) | |
320 | { | |
321 | QEMUIOVector sub_qiov; | |
322 | uint64_t offset; | |
323 | size_t data_size; | |
324 | int ret; | |
325 | NBDStructuredReplyChunk *chunk = &s->reply.structured; | |
326 | ||
327 | assert(nbd_reply_is_structured(&s->reply)); | |
328 | ||
b4176cb3 EB |
329 | /* The NBD spec requires at least one byte of payload */ |
330 | if (chunk->length <= sizeof(offset)) { | |
f140e300 VSO |
331 | error_setg(errp, "Protocol error: invalid payload for " |
332 | "NBD_REPLY_TYPE_OFFSET_DATA"); | |
333 | return -EINVAL; | |
334 | } | |
335 | ||
e6798f06 | 336 | if (nbd_read64(s->ioc, &offset, "OFFSET_DATA offset", errp) < 0) { |
f140e300 VSO |
337 | return -EIO; |
338 | } | |
f140e300 VSO |
339 | |
340 | data_size = chunk->length - sizeof(offset); | |
b4176cb3 | 341 | assert(data_size); |
f140e300 VSO |
342 | if (offset < orig_offset || data_size > qiov->size || |
343 | offset > orig_offset + qiov->size - data_size) { | |
344 | error_setg(errp, "Protocol error: server sent chunk exceeding requested" | |
345 | " region"); | |
346 | return -EINVAL; | |
347 | } | |
348 | ||
349 | qemu_iovec_init(&sub_qiov, qiov->niov); | |
350 | qemu_iovec_concat(&sub_qiov, qiov, offset - orig_offset, data_size); | |
351 | ret = qio_channel_readv_all(s->ioc, sub_qiov.iov, sub_qiov.niov, errp); | |
352 | qemu_iovec_destroy(&sub_qiov); | |
353 | ||
354 | return ret < 0 ? -EIO : 0; | |
355 | } | |
356 | ||
357 | #define NBD_MAX_MALLOC_PAYLOAD 1000 | |
358 | /* nbd_co_receive_structured_payload | |
359 | */ | |
360 | static coroutine_fn int nbd_co_receive_structured_payload( | |
361 | NBDClientSession *s, void **payload, Error **errp) | |
362 | { | |
363 | int ret; | |
364 | uint32_t len; | |
365 | ||
366 | assert(nbd_reply_is_structured(&s->reply)); | |
367 | ||
368 | len = s->reply.structured.length; | |
369 | ||
370 | if (len == 0) { | |
371 | return 0; | |
372 | } | |
373 | ||
374 | if (payload == NULL) { | |
375 | error_setg(errp, "Unexpected structured payload"); | |
376 | return -EINVAL; | |
377 | } | |
378 | ||
379 | if (len > NBD_MAX_MALLOC_PAYLOAD) { | |
380 | error_setg(errp, "Payload too large"); | |
381 | return -EINVAL; | |
382 | } | |
383 | ||
384 | *payload = g_new(char, len); | |
e6798f06 | 385 | ret = nbd_read(s->ioc, *payload, len, "structured payload", errp); |
f140e300 VSO |
386 | if (ret < 0) { |
387 | g_free(*payload); | |
388 | *payload = NULL; | |
389 | return ret; | |
390 | } | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
395 | /* nbd_co_do_receive_one_chunk | |
396 | * for simple reply: | |
397 | * set request_ret to received reply error | |
398 | * if qiov is not NULL: read payload to @qiov | |
399 | * for structured reply chunk: | |
400 | * if error chunk: read payload, set @request_ret, do not set @payload | |
401 | * else if offset_data chunk: read payload data to @qiov, do not set @payload | |
402 | * else: read payload to @payload | |
403 | * | |
404 | * If function fails, @errp contains corresponding error message, and the | |
405 | * connection with the server is suspect. If it returns 0, then the | |
406 | * transaction succeeded (although @request_ret may be a negative errno | |
407 | * corresponding to the server's error reply), and errp is unchanged. | |
408 | */ | |
409 | static coroutine_fn int nbd_co_do_receive_one_chunk( | |
410 | NBDClientSession *s, uint64_t handle, bool only_structured, | |
411 | int *request_ret, QEMUIOVector *qiov, void **payload, Error **errp) | |
2302c1ca | 412 | { |
319a56cd | 413 | int ret; |
ed397b2f | 414 | int i = HANDLE_TO_INDEX(s, handle); |
f140e300 VSO |
415 | void *local_payload = NULL; |
416 | NBDStructuredReplyChunk *chunk; | |
417 | ||
418 | if (payload) { | |
419 | *payload = NULL; | |
420 | } | |
421 | *request_ret = 0; | |
2302c1ca | 422 | |
ff82911c | 423 | /* Wait until we're woken up by nbd_read_reply_entry. */ |
40f4a218 | 424 | s->requests[i].receiving = true; |
2302c1ca | 425 | qemu_coroutine_yield(); |
40f4a218 | 426 | s->requests[i].receiving = false; |
88ed4e1b | 427 | if (s->quit) { |
f140e300 VSO |
428 | error_setg(errp, "Connection closed"); |
429 | return -EIO; | |
430 | } | |
88ed4e1b | 431 | assert(s->ioc); |
f140e300 VSO |
432 | |
433 | assert(s->reply.handle == handle); | |
434 | ||
435 | if (nbd_reply_is_simple(&s->reply)) { | |
436 | if (only_structured) { | |
437 | error_setg(errp, "Protocol error: simple reply when structured " | |
438 | "reply chunk was expected"); | |
439 | return -EINVAL; | |
2302c1ca MAL |
440 | } |
441 | ||
f140e300 VSO |
442 | *request_ret = -nbd_errno_to_system_errno(s->reply.simple.error); |
443 | if (*request_ret < 0 || !qiov) { | |
444 | return 0; | |
445 | } | |
446 | ||
447 | return qio_channel_readv_all(s->ioc, qiov->iov, qiov->niov, | |
448 | errp) < 0 ? -EIO : 0; | |
449 | } | |
450 | ||
451 | /* handle structured reply chunk */ | |
452 | assert(s->info.structured_reply); | |
453 | chunk = &s->reply.structured; | |
454 | ||
455 | if (chunk->type == NBD_REPLY_TYPE_NONE) { | |
456 | if (!(chunk->flags & NBD_REPLY_FLAG_DONE)) { | |
457 | error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk without" | |
e659fb3b | 458 | " NBD_REPLY_FLAG_DONE flag set"); |
f140e300 VSO |
459 | return -EINVAL; |
460 | } | |
b4176cb3 EB |
461 | if (chunk->length) { |
462 | error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk with" | |
463 | " nonzero length"); | |
464 | return -EINVAL; | |
465 | } | |
f140e300 VSO |
466 | return 0; |
467 | } | |
468 | ||
469 | if (chunk->type == NBD_REPLY_TYPE_OFFSET_DATA) { | |
470 | if (!qiov) { | |
471 | error_setg(errp, "Unexpected NBD_REPLY_TYPE_OFFSET_DATA chunk"); | |
472 | return -EINVAL; | |
473 | } | |
474 | ||
475 | return nbd_co_receive_offset_data_payload(s, s->requests[i].offset, | |
476 | qiov, errp); | |
477 | } | |
478 | ||
479 | if (nbd_reply_type_is_error(chunk->type)) { | |
480 | payload = &local_payload; | |
481 | } | |
482 | ||
483 | ret = nbd_co_receive_structured_payload(s, payload, errp); | |
484 | if (ret < 0) { | |
485 | return ret; | |
2302c1ca | 486 | } |
ff82911c | 487 | |
f140e300 VSO |
488 | if (nbd_reply_type_is_error(chunk->type)) { |
489 | ret = nbd_parse_error_payload(chunk, local_payload, request_ret, errp); | |
490 | g_free(local_payload); | |
491 | return ret; | |
492 | } | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
497 | /* nbd_co_receive_one_chunk | |
498 | * Read reply, wake up read_reply_co and set s->quit if needed. | |
499 | * Return value is a fatal error code or normal nbd reply error code | |
500 | */ | |
501 | static coroutine_fn int nbd_co_receive_one_chunk( | |
502 | NBDClientSession *s, uint64_t handle, bool only_structured, | |
7f86068d VSO |
503 | int *request_ret, QEMUIOVector *qiov, NBDReply *reply, void **payload, |
504 | Error **errp) | |
f140e300 | 505 | { |
f140e300 | 506 | int ret = nbd_co_do_receive_one_chunk(s, handle, only_structured, |
7f86068d | 507 | request_ret, qiov, payload, errp); |
f140e300 VSO |
508 | |
509 | if (ret < 0) { | |
510 | s->quit = true; | |
511 | } else { | |
512 | /* For assert at loop start in nbd_read_reply_entry */ | |
513 | if (reply) { | |
514 | *reply = s->reply; | |
515 | } | |
516 | s->reply.handle = 0; | |
f140e300 | 517 | } |
ff82911c | 518 | |
ff82911c PB |
519 | if (s->read_reply_co) { |
520 | aio_co_wake(s->read_reply_co); | |
2302c1ca | 521 | } |
6bdcc018 | 522 | |
f140e300 VSO |
523 | return ret; |
524 | } | |
525 | ||
526 | typedef struct NBDReplyChunkIter { | |
527 | int ret; | |
7f86068d | 528 | int request_ret; |
f140e300 VSO |
529 | Error *err; |
530 | bool done, only_structured; | |
531 | } NBDReplyChunkIter; | |
532 | ||
7f86068d VSO |
533 | static void nbd_iter_channel_error(NBDReplyChunkIter *iter, |
534 | int ret, Error **local_err) | |
f140e300 VSO |
535 | { |
536 | assert(ret < 0); | |
537 | ||
7f86068d | 538 | if (!iter->ret) { |
f140e300 VSO |
539 | iter->ret = ret; |
540 | error_propagate(&iter->err, *local_err); | |
541 | } else { | |
542 | error_free(*local_err); | |
543 | } | |
544 | ||
545 | *local_err = NULL; | |
546 | } | |
547 | ||
7f86068d VSO |
548 | static void nbd_iter_request_error(NBDReplyChunkIter *iter, int ret) |
549 | { | |
550 | assert(ret < 0); | |
551 | ||
552 | if (!iter->request_ret) { | |
553 | iter->request_ret = ret; | |
554 | } | |
555 | } | |
556 | ||
f140e300 VSO |
557 | /* NBD_FOREACH_REPLY_CHUNK |
558 | */ | |
559 | #define NBD_FOREACH_REPLY_CHUNK(s, iter, handle, structured, \ | |
560 | qiov, reply, payload) \ | |
561 | for (iter = (NBDReplyChunkIter) { .only_structured = structured }; \ | |
562 | nbd_reply_chunk_iter_receive(s, &iter, handle, qiov, reply, payload);) | |
563 | ||
564 | /* nbd_reply_chunk_iter_receive | |
565 | */ | |
566 | static bool nbd_reply_chunk_iter_receive(NBDClientSession *s, | |
567 | NBDReplyChunkIter *iter, | |
568 | uint64_t handle, | |
569 | QEMUIOVector *qiov, NBDReply *reply, | |
570 | void **payload) | |
571 | { | |
7f86068d | 572 | int ret, request_ret; |
f140e300 VSO |
573 | NBDReply local_reply; |
574 | NBDStructuredReplyChunk *chunk; | |
575 | Error *local_err = NULL; | |
576 | if (s->quit) { | |
577 | error_setg(&local_err, "Connection closed"); | |
7f86068d | 578 | nbd_iter_channel_error(iter, -EIO, &local_err); |
f140e300 VSO |
579 | goto break_loop; |
580 | } | |
581 | ||
582 | if (iter->done) { | |
583 | /* Previous iteration was last. */ | |
584 | goto break_loop; | |
585 | } | |
586 | ||
587 | if (reply == NULL) { | |
588 | reply = &local_reply; | |
589 | } | |
590 | ||
591 | ret = nbd_co_receive_one_chunk(s, handle, iter->only_structured, | |
7f86068d VSO |
592 | &request_ret, qiov, reply, payload, |
593 | &local_err); | |
f140e300 | 594 | if (ret < 0) { |
7f86068d VSO |
595 | nbd_iter_channel_error(iter, ret, &local_err); |
596 | } else if (request_ret < 0) { | |
597 | nbd_iter_request_error(iter, request_ret); | |
f140e300 VSO |
598 | } |
599 | ||
600 | /* Do not execute the body of NBD_FOREACH_REPLY_CHUNK for simple reply. */ | |
65e01d47 | 601 | if (nbd_reply_is_simple(reply) || s->quit) { |
f140e300 VSO |
602 | goto break_loop; |
603 | } | |
604 | ||
605 | chunk = &reply->structured; | |
606 | iter->only_structured = true; | |
607 | ||
608 | if (chunk->type == NBD_REPLY_TYPE_NONE) { | |
609 | /* NBD_REPLY_FLAG_DONE is already checked in nbd_co_receive_one_chunk */ | |
610 | assert(chunk->flags & NBD_REPLY_FLAG_DONE); | |
611 | goto break_loop; | |
612 | } | |
613 | ||
614 | if (chunk->flags & NBD_REPLY_FLAG_DONE) { | |
615 | /* This iteration is last. */ | |
616 | iter->done = true; | |
617 | } | |
618 | ||
619 | /* Execute the loop body */ | |
620 | return true; | |
621 | ||
622 | break_loop: | |
623 | s->requests[HANDLE_TO_INDEX(s, handle)].coroutine = NULL; | |
624 | ||
6bdcc018 PB |
625 | qemu_co_mutex_lock(&s->send_mutex); |
626 | s->in_flight--; | |
627 | qemu_co_queue_next(&s->free_sema); | |
628 | qemu_co_mutex_unlock(&s->send_mutex); | |
319a56cd | 629 | |
f140e300 | 630 | return false; |
2302c1ca MAL |
631 | } |
632 | ||
f140e300 | 633 | static int nbd_co_receive_return_code(NBDClientSession *s, uint64_t handle, |
7f86068d | 634 | int *request_ret, Error **errp) |
f140e300 VSO |
635 | { |
636 | NBDReplyChunkIter iter; | |
637 | ||
638 | NBD_FOREACH_REPLY_CHUNK(s, iter, handle, false, NULL, NULL, NULL) { | |
639 | /* nbd_reply_chunk_iter_receive does all the work */ | |
640 | } | |
641 | ||
642 | error_propagate(errp, iter.err); | |
7f86068d | 643 | *request_ret = iter.request_ret; |
f140e300 VSO |
644 | return iter.ret; |
645 | } | |
646 | ||
647 | static int nbd_co_receive_cmdread_reply(NBDClientSession *s, uint64_t handle, | |
648 | uint64_t offset, QEMUIOVector *qiov, | |
7f86068d | 649 | int *request_ret, Error **errp) |
f140e300 VSO |
650 | { |
651 | NBDReplyChunkIter iter; | |
652 | NBDReply reply; | |
653 | void *payload = NULL; | |
654 | Error *local_err = NULL; | |
655 | ||
656 | NBD_FOREACH_REPLY_CHUNK(s, iter, handle, s->info.structured_reply, | |
657 | qiov, &reply, &payload) | |
658 | { | |
659 | int ret; | |
660 | NBDStructuredReplyChunk *chunk = &reply.structured; | |
661 | ||
662 | assert(nbd_reply_is_structured(&reply)); | |
663 | ||
664 | switch (chunk->type) { | |
665 | case NBD_REPLY_TYPE_OFFSET_DATA: | |
666 | /* special cased in nbd_co_receive_one_chunk, data is already | |
667 | * in qiov */ | |
668 | break; | |
669 | case NBD_REPLY_TYPE_OFFSET_HOLE: | |
670 | ret = nbd_parse_offset_hole_payload(&reply.structured, payload, | |
671 | offset, qiov, &local_err); | |
672 | if (ret < 0) { | |
673 | s->quit = true; | |
7f86068d | 674 | nbd_iter_channel_error(&iter, ret, &local_err); |
f140e300 VSO |
675 | } |
676 | break; | |
677 | default: | |
678 | if (!nbd_reply_type_is_error(chunk->type)) { | |
679 | /* not allowed reply type */ | |
680 | s->quit = true; | |
681 | error_setg(&local_err, | |
682 | "Unexpected reply type: %d (%s) for CMD_READ", | |
683 | chunk->type, nbd_reply_type_lookup(chunk->type)); | |
7f86068d | 684 | nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
f140e300 VSO |
685 | } |
686 | } | |
687 | ||
688 | g_free(payload); | |
689 | payload = NULL; | |
690 | } | |
691 | ||
692 | error_propagate(errp, iter.err); | |
7f86068d | 693 | *request_ret = iter.request_ret; |
f140e300 VSO |
694 | return iter.ret; |
695 | } | |
696 | ||
78a33ab5 VSO |
697 | static int nbd_co_receive_blockstatus_reply(NBDClientSession *s, |
698 | uint64_t handle, uint64_t length, | |
7f86068d VSO |
699 | NBDExtent *extent, |
700 | int *request_ret, Error **errp) | |
78a33ab5 VSO |
701 | { |
702 | NBDReplyChunkIter iter; | |
703 | NBDReply reply; | |
704 | void *payload = NULL; | |
705 | Error *local_err = NULL; | |
706 | bool received = false; | |
707 | ||
708 | assert(!extent->length); | |
709 | NBD_FOREACH_REPLY_CHUNK(s, iter, handle, s->info.structured_reply, | |
710 | NULL, &reply, &payload) | |
711 | { | |
712 | int ret; | |
713 | NBDStructuredReplyChunk *chunk = &reply.structured; | |
714 | ||
715 | assert(nbd_reply_is_structured(&reply)); | |
716 | ||
717 | switch (chunk->type) { | |
718 | case NBD_REPLY_TYPE_BLOCK_STATUS: | |
719 | if (received) { | |
720 | s->quit = true; | |
721 | error_setg(&local_err, "Several BLOCK_STATUS chunks in reply"); | |
7f86068d | 722 | nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
78a33ab5 VSO |
723 | } |
724 | received = true; | |
725 | ||
726 | ret = nbd_parse_blockstatus_payload(s, &reply.structured, | |
727 | payload, length, extent, | |
728 | &local_err); | |
729 | if (ret < 0) { | |
730 | s->quit = true; | |
7f86068d | 731 | nbd_iter_channel_error(&iter, ret, &local_err); |
78a33ab5 VSO |
732 | } |
733 | break; | |
734 | default: | |
735 | if (!nbd_reply_type_is_error(chunk->type)) { | |
736 | s->quit = true; | |
737 | error_setg(&local_err, | |
738 | "Unexpected reply type: %d (%s) " | |
739 | "for CMD_BLOCK_STATUS", | |
740 | chunk->type, nbd_reply_type_lookup(chunk->type)); | |
7f86068d | 741 | nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
78a33ab5 VSO |
742 | } |
743 | } | |
744 | ||
745 | g_free(payload); | |
746 | payload = NULL; | |
747 | } | |
748 | ||
749 | if (!extent->length && !iter.err) { | |
750 | error_setg(&iter.err, | |
751 | "Server did not reply with any status extents"); | |
752 | if (!iter.ret) { | |
753 | iter.ret = -EIO; | |
754 | } | |
755 | } | |
7f86068d | 756 | |
78a33ab5 | 757 | error_propagate(errp, iter.err); |
7f86068d | 758 | *request_ret = iter.request_ret; |
78a33ab5 VSO |
759 | return iter.ret; |
760 | } | |
761 | ||
f140e300 VSO |
762 | static int nbd_co_request(BlockDriverState *bs, NBDRequest *request, |
763 | QEMUIOVector *write_qiov) | |
f35dff7e | 764 | { |
7f86068d | 765 | int ret, request_ret; |
f140e300 VSO |
766 | Error *local_err = NULL; |
767 | NBDClientSession *client = nbd_get_client_session(bs); | |
f35dff7e | 768 | |
f140e300 VSO |
769 | assert(request->type != NBD_CMD_READ); |
770 | if (write_qiov) { | |
771 | assert(request->type == NBD_CMD_WRITE); | |
772 | assert(request->len == iov_size(write_qiov->iov, write_qiov->niov)); | |
4bfe4478 | 773 | } else { |
f140e300 | 774 | assert(request->type != NBD_CMD_WRITE); |
4bfe4478 | 775 | } |
f140e300 | 776 | ret = nbd_co_send_request(bs, request, write_qiov); |
f35dff7e | 777 | if (ret < 0) { |
319a56cd | 778 | return ret; |
f35dff7e | 779 | } |
319a56cd | 780 | |
7f86068d VSO |
781 | ret = nbd_co_receive_return_code(client, request->handle, |
782 | &request_ret, &local_err); | |
f140e300 | 783 | if (local_err) { |
d8b4bad8 VSO |
784 | trace_nbd_co_request_fail(request->from, request->len, request->handle, |
785 | request->flags, request->type, | |
786 | nbd_cmd_lookup(request->type), | |
787 | ret, error_get_pretty(local_err)); | |
788 | error_free(local_err); | |
f140e300 | 789 | } |
7f86068d | 790 | return ret ? ret : request_ret; |
f35dff7e VSO |
791 | } |
792 | ||
70c4fb26 EB |
793 | int nbd_client_co_preadv(BlockDriverState *bs, uint64_t offset, |
794 | uint64_t bytes, QEMUIOVector *qiov, int flags) | |
2302c1ca | 795 | { |
7f86068d | 796 | int ret, request_ret; |
f140e300 VSO |
797 | Error *local_err = NULL; |
798 | NBDClientSession *client = nbd_get_client_session(bs); | |
ed2dd912 | 799 | NBDRequest request = { |
70c4fb26 EB |
800 | .type = NBD_CMD_READ, |
801 | .from = offset, | |
802 | .len = bytes, | |
803 | }; | |
2302c1ca | 804 | |
70c4fb26 EB |
805 | assert(bytes <= NBD_MAX_BUFFER_SIZE); |
806 | assert(!flags); | |
2302c1ca | 807 | |
9d8f818c EB |
808 | if (!bytes) { |
809 | return 0; | |
810 | } | |
f140e300 VSO |
811 | ret = nbd_co_send_request(bs, &request, NULL); |
812 | if (ret < 0) { | |
813 | return ret; | |
814 | } | |
815 | ||
816 | ret = nbd_co_receive_cmdread_reply(client, request.handle, offset, qiov, | |
7f86068d | 817 | &request_ret, &local_err); |
08ace1d7 | 818 | if (local_err) { |
d8b4bad8 VSO |
819 | trace_nbd_co_request_fail(request.from, request.len, request.handle, |
820 | request.flags, request.type, | |
821 | nbd_cmd_lookup(request.type), | |
822 | ret, error_get_pretty(local_err)); | |
823 | error_free(local_err); | |
f140e300 | 824 | } |
7f86068d | 825 | return ret ? ret : request_ret; |
2302c1ca MAL |
826 | } |
827 | ||
70c4fb26 EB |
828 | int nbd_client_co_pwritev(BlockDriverState *bs, uint64_t offset, |
829 | uint64_t bytes, QEMUIOVector *qiov, int flags) | |
2302c1ca | 830 | { |
10676b81 | 831 | NBDClientSession *client = nbd_get_client_session(bs); |
ed2dd912 | 832 | NBDRequest request = { |
70c4fb26 EB |
833 | .type = NBD_CMD_WRITE, |
834 | .from = offset, | |
835 | .len = bytes, | |
836 | }; | |
2302c1ca | 837 | |
1104d83c | 838 | assert(!(client->info.flags & NBD_FLAG_READ_ONLY)); |
52a46505 | 839 | if (flags & BDRV_REQ_FUA) { |
004a89fc | 840 | assert(client->info.flags & NBD_FLAG_SEND_FUA); |
b626b51a | 841 | request.flags |= NBD_CMD_FLAG_FUA; |
2302c1ca MAL |
842 | } |
843 | ||
70c4fb26 | 844 | assert(bytes <= NBD_MAX_BUFFER_SIZE); |
2302c1ca | 845 | |
9d8f818c EB |
846 | if (!bytes) { |
847 | return 0; | |
848 | } | |
f35dff7e | 849 | return nbd_co_request(bs, &request, qiov); |
2302c1ca MAL |
850 | } |
851 | ||
fa778fff | 852 | int nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, |
f5a5ca79 | 853 | int bytes, BdrvRequestFlags flags) |
fa778fff | 854 | { |
fa778fff EB |
855 | NBDClientSession *client = nbd_get_client_session(bs); |
856 | NBDRequest request = { | |
857 | .type = NBD_CMD_WRITE_ZEROES, | |
858 | .from = offset, | |
f5a5ca79 | 859 | .len = bytes, |
fa778fff | 860 | }; |
fa778fff | 861 | |
1104d83c | 862 | assert(!(client->info.flags & NBD_FLAG_READ_ONLY)); |
004a89fc | 863 | if (!(client->info.flags & NBD_FLAG_SEND_WRITE_ZEROES)) { |
fa778fff EB |
864 | return -ENOTSUP; |
865 | } | |
866 | ||
867 | if (flags & BDRV_REQ_FUA) { | |
004a89fc | 868 | assert(client->info.flags & NBD_FLAG_SEND_FUA); |
fa778fff EB |
869 | request.flags |= NBD_CMD_FLAG_FUA; |
870 | } | |
871 | if (!(flags & BDRV_REQ_MAY_UNMAP)) { | |
872 | request.flags |= NBD_CMD_FLAG_NO_HOLE; | |
873 | } | |
874 | ||
9d8f818c EB |
875 | if (!bytes) { |
876 | return 0; | |
877 | } | |
f35dff7e | 878 | return nbd_co_request(bs, &request, NULL); |
fa778fff EB |
879 | } |
880 | ||
f53a829b | 881 | int nbd_client_co_flush(BlockDriverState *bs) |
2302c1ca | 882 | { |
10676b81 | 883 | NBDClientSession *client = nbd_get_client_session(bs); |
ed2dd912 | 884 | NBDRequest request = { .type = NBD_CMD_FLUSH }; |
2302c1ca | 885 | |
004a89fc | 886 | if (!(client->info.flags & NBD_FLAG_SEND_FLUSH)) { |
2302c1ca MAL |
887 | return 0; |
888 | } | |
889 | ||
2302c1ca MAL |
890 | request.from = 0; |
891 | request.len = 0; | |
892 | ||
f35dff7e | 893 | return nbd_co_request(bs, &request, NULL); |
2302c1ca MAL |
894 | } |
895 | ||
f5a5ca79 | 896 | int nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) |
2302c1ca | 897 | { |
10676b81 | 898 | NBDClientSession *client = nbd_get_client_session(bs); |
ed2dd912 | 899 | NBDRequest request = { |
447e57c3 EB |
900 | .type = NBD_CMD_TRIM, |
901 | .from = offset, | |
f5a5ca79 | 902 | .len = bytes, |
447e57c3 | 903 | }; |
2302c1ca | 904 | |
1104d83c | 905 | assert(!(client->info.flags & NBD_FLAG_READ_ONLY)); |
9d8f818c | 906 | if (!(client->info.flags & NBD_FLAG_SEND_TRIM) || !bytes) { |
2302c1ca MAL |
907 | return 0; |
908 | } | |
2302c1ca | 909 | |
f35dff7e | 910 | return nbd_co_request(bs, &request, NULL); |
2302c1ca MAL |
911 | } |
912 | ||
78a33ab5 VSO |
913 | int coroutine_fn nbd_client_co_block_status(BlockDriverState *bs, |
914 | bool want_zero, | |
915 | int64_t offset, int64_t bytes, | |
916 | int64_t *pnum, int64_t *map, | |
917 | BlockDriverState **file) | |
918 | { | |
7f86068d | 919 | int ret, request_ret; |
78a33ab5 VSO |
920 | NBDExtent extent = { 0 }; |
921 | NBDClientSession *client = nbd_get_client_session(bs); | |
922 | Error *local_err = NULL; | |
923 | ||
924 | NBDRequest request = { | |
925 | .type = NBD_CMD_BLOCK_STATUS, | |
926 | .from = offset, | |
927 | .len = MIN(MIN_NON_ZERO(QEMU_ALIGN_DOWN(INT_MAX, | |
928 | bs->bl.request_alignment), | |
929 | client->info.max_block), bytes), | |
930 | .flags = NBD_CMD_FLAG_REQ_ONE, | |
931 | }; | |
932 | ||
933 | if (!client->info.base_allocation) { | |
934 | *pnum = bytes; | |
935 | return BDRV_BLOCK_DATA; | |
936 | } | |
937 | ||
938 | ret = nbd_co_send_request(bs, &request, NULL); | |
939 | if (ret < 0) { | |
940 | return ret; | |
941 | } | |
942 | ||
943 | ret = nbd_co_receive_blockstatus_reply(client, request.handle, bytes, | |
7f86068d | 944 | &extent, &request_ret, &local_err); |
78a33ab5 | 945 | if (local_err) { |
d8b4bad8 VSO |
946 | trace_nbd_co_request_fail(request.from, request.len, request.handle, |
947 | request.flags, request.type, | |
948 | nbd_cmd_lookup(request.type), | |
949 | ret, error_get_pretty(local_err)); | |
950 | error_free(local_err); | |
78a33ab5 | 951 | } |
7f86068d VSO |
952 | if (ret < 0 || request_ret < 0) { |
953 | return ret ? ret : request_ret; | |
78a33ab5 VSO |
954 | } |
955 | ||
956 | assert(extent.length); | |
957 | *pnum = extent.length; | |
958 | return (extent.flags & NBD_STATE_HOLE ? 0 : BDRV_BLOCK_DATA) | | |
959 | (extent.flags & NBD_STATE_ZERO ? BDRV_BLOCK_ZERO : 0); | |
960 | } | |
961 | ||
f53a829b | 962 | void nbd_client_detach_aio_context(BlockDriverState *bs) |
69447cd8 | 963 | { |
ff82911c | 964 | NBDClientSession *client = nbd_get_client_session(bs); |
96d06835 | 965 | qio_channel_detach_aio_context(QIO_CHANNEL(client->ioc)); |
69447cd8 SH |
966 | } |
967 | ||
f53a829b HR |
968 | void nbd_client_attach_aio_context(BlockDriverState *bs, |
969 | AioContext *new_context) | |
69447cd8 | 970 | { |
ff82911c | 971 | NBDClientSession *client = nbd_get_client_session(bs); |
96d06835 | 972 | qio_channel_attach_aio_context(QIO_CHANNEL(client->ioc), new_context); |
ff82911c | 973 | aio_co_schedule(new_context, client->read_reply_co); |
69447cd8 SH |
974 | } |
975 | ||
f53a829b | 976 | void nbd_client_close(BlockDriverState *bs) |
2302c1ca | 977 | { |
10676b81 | 978 | NBDClientSession *client = nbd_get_client_session(bs); |
ed2dd912 | 979 | NBDRequest request = { .type = NBD_CMD_DISC }; |
2302c1ca | 980 | |
88ed4e1b | 981 | assert(client->ioc); |
4a41a2d6 | 982 | |
1c778ef7 | 983 | nbd_send_request(client->ioc, &request); |
5ad283eb | 984 | |
f53a829b | 985 | nbd_teardown_connection(bs); |
2302c1ca MAL |
986 | } |
987 | ||
d42f78e9 VSO |
988 | static QIOChannelSocket *nbd_establish_connection(SocketAddress *saddr, |
989 | Error **errp) | |
990 | { | |
991 | QIOChannelSocket *sioc; | |
992 | Error *local_err = NULL; | |
993 | ||
994 | sioc = qio_channel_socket_new(); | |
995 | qio_channel_set_name(QIO_CHANNEL(sioc), "nbd-client"); | |
996 | ||
997 | qio_channel_socket_connect_sync(sioc, saddr, &local_err); | |
998 | if (local_err) { | |
999 | object_unref(OBJECT(sioc)); | |
1000 | error_propagate(errp, local_err); | |
1001 | return NULL; | |
1002 | } | |
1003 | ||
1004 | qio_channel_set_delay(QIO_CHANNEL(sioc), false); | |
1005 | ||
1006 | return sioc; | |
1007 | } | |
1008 | ||
b0e4b5a5 VSO |
1009 | static int nbd_client_connect(BlockDriverState *bs, |
1010 | SocketAddress *saddr, | |
1011 | const char *export, | |
1012 | QCryptoTLSCreds *tlscreds, | |
1013 | const char *hostname, | |
1014 | const char *x_dirty_bitmap, | |
1015 | Error **errp) | |
2302c1ca | 1016 | { |
10676b81 | 1017 | NBDClientSession *client = nbd_get_client_session(bs); |
2302c1ca MAL |
1018 | int ret; |
1019 | ||
d42f78e9 VSO |
1020 | /* |
1021 | * establish TCP connection, return error if it fails | |
1022 | * TODO: Configurable retry-until-timeout behaviour. | |
1023 | */ | |
1024 | QIOChannelSocket *sioc = nbd_establish_connection(saddr, errp); | |
1025 | ||
1026 | if (!sioc) { | |
1027 | return -ECONNREFUSED; | |
1028 | } | |
1029 | ||
2302c1ca | 1030 | /* NBD handshake */ |
e2bc625f | 1031 | logout("session init %s\n", export); |
064097d9 DB |
1032 | qio_channel_set_blocking(QIO_CHANNEL(sioc), true, NULL); |
1033 | ||
081dd1fe | 1034 | client->info.request_sizes = true; |
f140e300 | 1035 | client->info.structured_reply = true; |
78a33ab5 | 1036 | client->info.base_allocation = true; |
216ee365 | 1037 | client->info.x_dirty_bitmap = g_strdup(x_dirty_bitmap); |
6dc1667d EB |
1038 | client->info.name = g_strdup(export ?: ""); |
1039 | ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), tlscreds, hostname, | |
004a89fc | 1040 | &client->ioc, &client->info, errp); |
216ee365 | 1041 | g_free(client->info.x_dirty_bitmap); |
6dc1667d | 1042 | g_free(client->info.name); |
2302c1ca MAL |
1043 | if (ret < 0) { |
1044 | logout("Failed to negotiate with the NBD server\n"); | |
d42f78e9 | 1045 | object_unref(OBJECT(sioc)); |
2302c1ca MAL |
1046 | return ret; |
1047 | } | |
47829c40 EB |
1048 | if (x_dirty_bitmap && !client->info.base_allocation) { |
1049 | error_setg(errp, "requested x-dirty-bitmap %s not found", | |
1050 | x_dirty_bitmap); | |
c688e6ca EB |
1051 | ret = -EINVAL; |
1052 | goto fail; | |
47829c40 | 1053 | } |
6c2e581d KW |
1054 | if (client->info.flags & NBD_FLAG_READ_ONLY) { |
1055 | ret = bdrv_apply_auto_read_only(bs, "NBD export is read-only", errp); | |
1056 | if (ret < 0) { | |
c688e6ca | 1057 | goto fail; |
6c2e581d | 1058 | } |
1104d83c | 1059 | } |
004a89fc | 1060 | if (client->info.flags & NBD_FLAG_SEND_FUA) { |
4df863f3 | 1061 | bs->supported_write_flags = BDRV_REQ_FUA; |
169407e1 EB |
1062 | bs->supported_zero_flags |= BDRV_REQ_FUA; |
1063 | } | |
004a89fc | 1064 | if (client->info.flags & NBD_FLAG_SEND_WRITE_ZEROES) { |
169407e1 | 1065 | bs->supported_zero_flags |= BDRV_REQ_MAY_UNMAP; |
4df863f3 | 1066 | } |
2302c1ca | 1067 | |
064097d9 | 1068 | client->sioc = sioc; |
f95910fe DB |
1069 | |
1070 | if (!client->ioc) { | |
1071 | client->ioc = QIO_CHANNEL(sioc); | |
1072 | object_ref(OBJECT(client->ioc)); | |
1073 | } | |
2302c1ca MAL |
1074 | |
1075 | /* Now that we're connected, set the socket to be non-blocking and | |
1076 | * kick the reply mechanism. */ | |
064097d9 | 1077 | qio_channel_set_blocking(QIO_CHANNEL(sioc), false, NULL); |
ff82911c | 1078 | client->read_reply_co = qemu_coroutine_create(nbd_read_reply_entry, client); |
f53a829b | 1079 | nbd_client_attach_aio_context(bs, bdrv_get_aio_context(bs)); |
2302c1ca MAL |
1080 | |
1081 | logout("Established connection with NBD server\n"); | |
1082 | return 0; | |
c688e6ca EB |
1083 | |
1084 | fail: | |
1085 | /* | |
1086 | * We have connected, but must fail for other reasons. The | |
1087 | * connection is still blocking; send NBD_CMD_DISC as a courtesy | |
1088 | * to the server. | |
1089 | */ | |
1090 | { | |
1091 | NBDRequest request = { .type = NBD_CMD_DISC }; | |
1092 | ||
1093 | nbd_send_request(client->ioc ?: QIO_CHANNEL(sioc), &request); | |
d42f78e9 VSO |
1094 | |
1095 | object_unref(OBJECT(sioc)); | |
1096 | ||
c688e6ca EB |
1097 | return ret; |
1098 | } | |
2302c1ca | 1099 | } |
b0e4b5a5 VSO |
1100 | |
1101 | int nbd_client_init(BlockDriverState *bs, | |
1102 | SocketAddress *saddr, | |
1103 | const char *export, | |
1104 | QCryptoTLSCreds *tlscreds, | |
1105 | const char *hostname, | |
1106 | const char *x_dirty_bitmap, | |
1107 | Error **errp) | |
1108 | { | |
1109 | NBDClientSession *client = nbd_get_client_session(bs); | |
1110 | ||
1111 | qemu_co_mutex_init(&client->send_mutex); | |
1112 | qemu_co_queue_init(&client->free_sema); | |
1113 | ||
1114 | return nbd_client_connect(bs, saddr, export, tlscreds, hostname, | |
1115 | x_dirty_bitmap, errp); | |
1116 | } |