1 | /* |
2 | * QEMU Block driver for NBD |
3 | * |
4 | * Copyright (C) 2016 Red Hat, Inc. |
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 | |
30 | #include "qemu/osdep.h" |
31 | |
32 | #include "trace.h" |
33 | #include "qemu/uri.h" |
34 | #include "qemu/option.h" |
35 | #include "qemu/cutils.h" |
36 | #include "qemu/main-loop.h" |
37 | |
38 | #include "qapi/qapi-visit-sockets.h" |
39 | #include "qapi/qmp/qstring.h" |
40 | |
41 | #include "block/qdict.h" |
42 | #include "block/nbd.h" |
43 | #include "block/block_int.h" |
44 | |
45 | #define EN_OPTSTR ":exportname=" |
46 | #define MAX_NBD_REQUESTS 16 |
47 | |
48 | #define HANDLE_TO_INDEX(bs, handle) ((handle) ^ (uint64_t)(intptr_t)(bs)) |
49 | #define INDEX_TO_HANDLE(bs, index) ((index) ^ (uint64_t)(intptr_t)(bs)) |
50 | |
51 | typedef struct { |
52 | Coroutine *coroutine; |
53 | uint64_t offset; /* original offset of the request */ |
54 | bool receiving; /* waiting for connection_co? */ |
55 | } NBDClientRequest; |
56 | |
57 | typedef enum NBDClientState { |
58 | NBD_CLIENT_CONNECTED, |
59 | NBD_CLIENT_QUIT |
60 | } NBDClientState; |
61 | |
62 | typedef struct BDRVNBDState { |
63 | QIOChannelSocket *sioc; /* The master data channel */ |
64 | QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */ |
65 | NBDExportInfo info; |
66 | |
67 | CoMutex send_mutex; |
68 | CoQueue free_sema; |
69 | Coroutine *connection_co; |
70 | int in_flight; |
71 | NBDClientState state; |
72 | |
73 | NBDClientRequest requests[MAX_NBD_REQUESTS]; |
74 | NBDReply reply; |
75 | BlockDriverState *bs; |
76 | |
77 | /* Connection parameters */ |
78 | uint32_t reconnect_delay; |
79 | SocketAddress *saddr; |
80 | char *export, *tlscredsid; |
81 | QCryptoTLSCreds *tlscreds; |
82 | const char *hostname; |
83 | char *x_dirty_bitmap; |
84 | } BDRVNBDState; |
85 | |
86 | /* @ret will be used for reconnect in future */ |
87 | static void nbd_channel_error(BDRVNBDState *s, int ret) |
88 | { |
89 | s->state = NBD_CLIENT_QUIT; |
90 | } |
91 | |
92 | static void nbd_recv_coroutines_wake_all(BDRVNBDState *s) |
93 | { |
94 | int i; |
95 | |
96 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { |
97 | NBDClientRequest *req = &s->requests[i]; |
98 | |
99 | if (req->coroutine && req->receiving) { |
100 | aio_co_wake(req->coroutine); |
101 | } |
102 | } |
103 | } |
104 | |
105 | static void nbd_client_detach_aio_context(BlockDriverState *bs) |
106 | { |
107 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
108 | |
109 | qio_channel_detach_aio_context(QIO_CHANNEL(s->ioc)); |
110 | } |
111 | |
112 | static void nbd_client_attach_aio_context_bh(void *opaque) |
113 | { |
114 | BlockDriverState *bs = opaque; |
115 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
116 | |
117 | /* |
118 | * The node is still drained, so we know the coroutine has yielded in |
119 | * nbd_read_eof(), the only place where bs->in_flight can reach 0, or it is |
120 | * entered for the first time. Both places are safe for entering the |
121 | * coroutine. |
122 | */ |
123 | qemu_aio_coroutine_enter(bs->aio_context, s->connection_co); |
124 | bdrv_dec_in_flight(bs); |
125 | } |
126 | |
127 | static void nbd_client_attach_aio_context(BlockDriverState *bs, |
128 | AioContext *new_context) |
129 | { |
130 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
131 | |
132 | qio_channel_attach_aio_context(QIO_CHANNEL(s->ioc), new_context); |
133 | |
134 | bdrv_inc_in_flight(bs); |
135 | |
136 | /* |
137 | * Need to wait here for the BH to run because the BH must run while the |
138 | * node is still drained. |
139 | */ |
140 | aio_wait_bh_oneshot(new_context, nbd_client_attach_aio_context_bh, bs); |
141 | } |
142 | |
143 | |
144 | static void nbd_teardown_connection(BlockDriverState *bs) |
145 | { |
146 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
147 | |
148 | assert(s->ioc); |
149 | |
150 | /* finish any pending coroutines */ |
151 | qio_channel_shutdown(s->ioc, |
152 | QIO_CHANNEL_SHUTDOWN_BOTH, |
153 | NULL); |
154 | BDRV_POLL_WHILE(bs, s->connection_co); |
155 | |
156 | nbd_client_detach_aio_context(bs); |
157 | object_unref(OBJECT(s->sioc)); |
158 | s->sioc = NULL; |
159 | object_unref(OBJECT(s->ioc)); |
160 | s->ioc = NULL; |
161 | } |
162 | |
163 | static coroutine_fn void nbd_connection_entry(void *opaque) |
164 | { |
165 | BDRVNBDState *s = opaque; |
166 | uint64_t i; |
167 | int ret = 0; |
168 | Error *local_err = NULL; |
169 | |
170 | while (s->state != NBD_CLIENT_QUIT) { |
171 | /* |
172 | * The NBD client can only really be considered idle when it has |
173 | * yielded from qio_channel_readv_all_eof(), waiting for data. This is |
174 | * the point where the additional scheduled coroutine entry happens |
175 | * after nbd_client_attach_aio_context(). |
176 | * |
177 | * Therefore we keep an additional in_flight reference all the time and |
178 | * only drop it temporarily here. |
179 | */ |
180 | assert(s->reply.handle == 0); |
181 | ret = nbd_receive_reply(s->bs, s->ioc, &s->reply, &local_err); |
182 | |
183 | if (local_err) { |
184 | trace_nbd_read_reply_entry_fail(ret, error_get_pretty(local_err)); |
185 | error_free(local_err); |
186 | } |
187 | if (ret <= 0) { |
188 | nbd_channel_error(s, ret ? ret : -EIO); |
189 | break; |
190 | } |
191 | |
192 | /* |
193 | * There's no need for a mutex on the receive side, because the |
194 | * handler acts as a synchronization point and ensures that only |
195 | * one coroutine is called until the reply finishes. |
196 | */ |
197 | i = HANDLE_TO_INDEX(s, s->reply.handle); |
198 | if (i >= MAX_NBD_REQUESTS || |
199 | !s->requests[i].coroutine || |
200 | !s->requests[i].receiving || |
201 | (nbd_reply_is_structured(&s->reply) && !s->info.structured_reply)) |
202 | { |
203 | nbd_channel_error(s, -EINVAL); |
204 | break; |
205 | } |
206 | |
207 | /* |
208 | * We're woken up again by the request itself. Note that there |
209 | * is no race between yielding and reentering connection_co. This |
210 | * is because: |
211 | * |
212 | * - if the request runs on the same AioContext, it is only |
213 | * entered after we yield |
214 | * |
215 | * - if the request runs on a different AioContext, reentering |
216 | * connection_co happens through a bottom half, which can only |
217 | * run after we yield. |
218 | */ |
219 | aio_co_wake(s->requests[i].coroutine); |
220 | qemu_coroutine_yield(); |
221 | } |
222 | |
223 | nbd_recv_coroutines_wake_all(s); |
224 | bdrv_dec_in_flight(s->bs); |
225 | |
226 | s->connection_co = NULL; |
227 | aio_wait_kick(); |
228 | } |
229 | |
230 | static int nbd_co_send_request(BlockDriverState *bs, |
231 | NBDRequest *request, |
232 | QEMUIOVector *qiov) |
233 | { |
234 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
235 | int rc, i = -1; |
236 | |
237 | qemu_co_mutex_lock(&s->send_mutex); |
238 | while (s->in_flight == MAX_NBD_REQUESTS) { |
239 | qemu_co_queue_wait(&s->free_sema, &s->send_mutex); |
240 | } |
241 | |
242 | if (s->state != NBD_CLIENT_CONNECTED) { |
243 | rc = -EIO; |
244 | goto err; |
245 | } |
246 | |
247 | s->in_flight++; |
248 | |
249 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { |
250 | if (s->requests[i].coroutine == NULL) { |
251 | break; |
252 | } |
253 | } |
254 | |
255 | g_assert(qemu_in_coroutine()); |
256 | assert(i < MAX_NBD_REQUESTS); |
257 | |
258 | s->requests[i].coroutine = qemu_coroutine_self(); |
259 | s->requests[i].offset = request->from; |
260 | s->requests[i].receiving = false; |
261 | |
262 | request->handle = INDEX_TO_HANDLE(s, i); |
263 | |
264 | assert(s->ioc); |
265 | |
266 | if (qiov) { |
267 | qio_channel_set_cork(s->ioc, true); |
268 | rc = nbd_send_request(s->ioc, request); |
269 | if (rc >= 0 && s->state == NBD_CLIENT_CONNECTED) { |
270 | if (qio_channel_writev_all(s->ioc, qiov->iov, qiov->niov, |
271 | NULL) < 0) { |
272 | rc = -EIO; |
273 | } |
274 | } else if (rc >= 0) { |
275 | rc = -EIO; |
276 | } |
277 | qio_channel_set_cork(s->ioc, false); |
278 | } else { |
279 | rc = nbd_send_request(s->ioc, request); |
280 | } |
281 | |
282 | err: |
283 | if (rc < 0) { |
284 | nbd_channel_error(s, rc); |
285 | if (i != -1) { |
286 | s->requests[i].coroutine = NULL; |
287 | s->in_flight--; |
288 | } |
289 | qemu_co_queue_next(&s->free_sema); |
290 | } |
291 | qemu_co_mutex_unlock(&s->send_mutex); |
292 | return rc; |
293 | } |
294 | |
295 | static inline uint16_t payload_advance16(uint8_t **payload) |
296 | { |
297 | *payload += 2; |
298 | return lduw_be_p(*payload - 2); |
299 | } |
300 | |
301 | static inline uint32_t payload_advance32(uint8_t **payload) |
302 | { |
303 | *payload += 4; |
304 | return ldl_be_p(*payload - 4); |
305 | } |
306 | |
307 | static inline uint64_t payload_advance64(uint8_t **payload) |
308 | { |
309 | *payload += 8; |
310 | return ldq_be_p(*payload - 8); |
311 | } |
312 | |
313 | static int nbd_parse_offset_hole_payload(BDRVNBDState *s, |
314 | NBDStructuredReplyChunk *chunk, |
315 | uint8_t *payload, uint64_t orig_offset, |
316 | QEMUIOVector *qiov, Error **errp) |
317 | { |
318 | uint64_t offset; |
319 | uint32_t hole_size; |
320 | |
321 | if (chunk->length != sizeof(offset) + sizeof(hole_size)) { |
322 | error_setg(errp, "Protocol error: invalid payload for " |
323 | "NBD_REPLY_TYPE_OFFSET_HOLE" ); |
324 | return -EINVAL; |
325 | } |
326 | |
327 | offset = payload_advance64(&payload); |
328 | hole_size = payload_advance32(&payload); |
329 | |
330 | if (!hole_size || offset < orig_offset || hole_size > qiov->size || |
331 | offset > orig_offset + qiov->size - hole_size) { |
332 | error_setg(errp, "Protocol error: server sent chunk exceeding requested" |
333 | " region" ); |
334 | return -EINVAL; |
335 | } |
336 | if (s->info.min_block && |
337 | !QEMU_IS_ALIGNED(hole_size, s->info.min_block)) { |
338 | trace_nbd_structured_read_compliance("hole" ); |
339 | } |
340 | |
341 | qemu_iovec_memset(qiov, offset - orig_offset, 0, hole_size); |
342 | |
343 | return 0; |
344 | } |
345 | |
346 | /* |
347 | * nbd_parse_blockstatus_payload |
348 | * Based on our request, we expect only one extent in reply, for the |
349 | * base:allocation context. |
350 | */ |
351 | static int nbd_parse_blockstatus_payload(BDRVNBDState *s, |
352 | NBDStructuredReplyChunk *chunk, |
353 | uint8_t *payload, uint64_t orig_length, |
354 | NBDExtent *extent, Error **errp) |
355 | { |
356 | uint32_t context_id; |
357 | |
358 | /* The server succeeded, so it must have sent [at least] one extent */ |
359 | if (chunk->length < sizeof(context_id) + sizeof(*extent)) { |
360 | error_setg(errp, "Protocol error: invalid payload for " |
361 | "NBD_REPLY_TYPE_BLOCK_STATUS" ); |
362 | return -EINVAL; |
363 | } |
364 | |
365 | context_id = payload_advance32(&payload); |
366 | if (s->info.context_id != context_id) { |
367 | error_setg(errp, "Protocol error: unexpected context id %d for " |
368 | "NBD_REPLY_TYPE_BLOCK_STATUS, when negotiated context " |
369 | "id is %d" , context_id, |
370 | s->info.context_id); |
371 | return -EINVAL; |
372 | } |
373 | |
374 | extent->length = payload_advance32(&payload); |
375 | extent->flags = payload_advance32(&payload); |
376 | |
377 | if (extent->length == 0) { |
378 | error_setg(errp, "Protocol error: server sent status chunk with " |
379 | "zero length" ); |
380 | return -EINVAL; |
381 | } |
382 | |
383 | /* |
384 | * A server sending unaligned block status is in violation of the |
385 | * protocol, but as qemu-nbd 3.1 is such a server (at least for |
386 | * POSIX files that are not a multiple of 512 bytes, since qemu |
387 | * rounds files up to 512-byte multiples but lseek(SEEK_HOLE) |
388 | * still sees an implicit hole beyond the real EOF), it's nicer to |
389 | * work around the misbehaving server. If the request included |
390 | * more than the final unaligned block, truncate it back to an |
391 | * aligned result; if the request was only the final block, round |
392 | * up to the full block and change the status to fully-allocated |
393 | * (always a safe status, even if it loses information). |
394 | */ |
395 | if (s->info.min_block && !QEMU_IS_ALIGNED(extent->length, |
396 | s->info.min_block)) { |
397 | trace_nbd_parse_blockstatus_compliance("extent length is unaligned" ); |
398 | if (extent->length > s->info.min_block) { |
399 | extent->length = QEMU_ALIGN_DOWN(extent->length, |
400 | s->info.min_block); |
401 | } else { |
402 | extent->length = s->info.min_block; |
403 | extent->flags = 0; |
404 | } |
405 | } |
406 | |
407 | /* |
408 | * We used NBD_CMD_FLAG_REQ_ONE, so the server should not have |
409 | * sent us any more than one extent, nor should it have included |
410 | * status beyond our request in that extent. However, it's easy |
411 | * enough to ignore the server's noncompliance without killing the |
412 | * connection; just ignore trailing extents, and clamp things to |
413 | * the length of our request. |
414 | */ |
415 | if (chunk->length > sizeof(context_id) + sizeof(*extent)) { |
416 | trace_nbd_parse_blockstatus_compliance("more than one extent" ); |
417 | } |
418 | if (extent->length > orig_length) { |
419 | extent->length = orig_length; |
420 | trace_nbd_parse_blockstatus_compliance("extent length too large" ); |
421 | } |
422 | |
423 | return 0; |
424 | } |
425 | |
426 | /* |
427 | * nbd_parse_error_payload |
428 | * on success @errp contains message describing nbd error reply |
429 | */ |
430 | static int nbd_parse_error_payload(NBDStructuredReplyChunk *chunk, |
431 | uint8_t *payload, int *request_ret, |
432 | Error **errp) |
433 | { |
434 | uint32_t error; |
435 | uint16_t message_size; |
436 | |
437 | assert(chunk->type & (1 << 15)); |
438 | |
439 | if (chunk->length < sizeof(error) + sizeof(message_size)) { |
440 | error_setg(errp, |
441 | "Protocol error: invalid payload for structured error" ); |
442 | return -EINVAL; |
443 | } |
444 | |
445 | error = nbd_errno_to_system_errno(payload_advance32(&payload)); |
446 | if (error == 0) { |
447 | error_setg(errp, "Protocol error: server sent structured error chunk " |
448 | "with error = 0" ); |
449 | return -EINVAL; |
450 | } |
451 | |
452 | *request_ret = -error; |
453 | message_size = payload_advance16(&payload); |
454 | |
455 | if (message_size > chunk->length - sizeof(error) - sizeof(message_size)) { |
456 | error_setg(errp, "Protocol error: server sent structured error chunk " |
457 | "with incorrect message size" ); |
458 | return -EINVAL; |
459 | } |
460 | |
461 | /* TODO: Add a trace point to mention the server complaint */ |
462 | |
463 | /* TODO handle ERROR_OFFSET */ |
464 | |
465 | return 0; |
466 | } |
467 | |
468 | static int nbd_co_receive_offset_data_payload(BDRVNBDState *s, |
469 | uint64_t orig_offset, |
470 | QEMUIOVector *qiov, Error **errp) |
471 | { |
472 | QEMUIOVector sub_qiov; |
473 | uint64_t offset; |
474 | size_t data_size; |
475 | int ret; |
476 | NBDStructuredReplyChunk *chunk = &s->reply.structured; |
477 | |
478 | assert(nbd_reply_is_structured(&s->reply)); |
479 | |
480 | /* The NBD spec requires at least one byte of payload */ |
481 | if (chunk->length <= sizeof(offset)) { |
482 | error_setg(errp, "Protocol error: invalid payload for " |
483 | "NBD_REPLY_TYPE_OFFSET_DATA" ); |
484 | return -EINVAL; |
485 | } |
486 | |
487 | if (nbd_read64(s->ioc, &offset, "OFFSET_DATA offset" , errp) < 0) { |
488 | return -EIO; |
489 | } |
490 | |
491 | data_size = chunk->length - sizeof(offset); |
492 | assert(data_size); |
493 | if (offset < orig_offset || data_size > qiov->size || |
494 | offset > orig_offset + qiov->size - data_size) { |
495 | error_setg(errp, "Protocol error: server sent chunk exceeding requested" |
496 | " region" ); |
497 | return -EINVAL; |
498 | } |
499 | if (s->info.min_block && !QEMU_IS_ALIGNED(data_size, s->info.min_block)) { |
500 | trace_nbd_structured_read_compliance("data" ); |
501 | } |
502 | |
503 | qemu_iovec_init(&sub_qiov, qiov->niov); |
504 | qemu_iovec_concat(&sub_qiov, qiov, offset - orig_offset, data_size); |
505 | ret = qio_channel_readv_all(s->ioc, sub_qiov.iov, sub_qiov.niov, errp); |
506 | qemu_iovec_destroy(&sub_qiov); |
507 | |
508 | return ret < 0 ? -EIO : 0; |
509 | } |
510 | |
511 | #define NBD_MAX_MALLOC_PAYLOAD 1000 |
512 | static coroutine_fn int nbd_co_receive_structured_payload( |
513 | BDRVNBDState *s, void **payload, Error **errp) |
514 | { |
515 | int ret; |
516 | uint32_t len; |
517 | |
518 | assert(nbd_reply_is_structured(&s->reply)); |
519 | |
520 | len = s->reply.structured.length; |
521 | |
522 | if (len == 0) { |
523 | return 0; |
524 | } |
525 | |
526 | if (payload == NULL) { |
527 | error_setg(errp, "Unexpected structured payload" ); |
528 | return -EINVAL; |
529 | } |
530 | |
531 | if (len > NBD_MAX_MALLOC_PAYLOAD) { |
532 | error_setg(errp, "Payload too large" ); |
533 | return -EINVAL; |
534 | } |
535 | |
536 | *payload = g_new(char, len); |
537 | ret = nbd_read(s->ioc, *payload, len, "structured payload" , errp); |
538 | if (ret < 0) { |
539 | g_free(*payload); |
540 | *payload = NULL; |
541 | return ret; |
542 | } |
543 | |
544 | return 0; |
545 | } |
546 | |
547 | /* |
548 | * nbd_co_do_receive_one_chunk |
549 | * for simple reply: |
550 | * set request_ret to received reply error |
551 | * if qiov is not NULL: read payload to @qiov |
552 | * for structured reply chunk: |
553 | * if error chunk: read payload, set @request_ret, do not set @payload |
554 | * else if offset_data chunk: read payload data to @qiov, do not set @payload |
555 | * else: read payload to @payload |
556 | * |
557 | * If function fails, @errp contains corresponding error message, and the |
558 | * connection with the server is suspect. If it returns 0, then the |
559 | * transaction succeeded (although @request_ret may be a negative errno |
560 | * corresponding to the server's error reply), and errp is unchanged. |
561 | */ |
562 | static coroutine_fn int nbd_co_do_receive_one_chunk( |
563 | BDRVNBDState *s, uint64_t handle, bool only_structured, |
564 | int *request_ret, QEMUIOVector *qiov, void **payload, Error **errp) |
565 | { |
566 | int ret; |
567 | int i = HANDLE_TO_INDEX(s, handle); |
568 | void *local_payload = NULL; |
569 | NBDStructuredReplyChunk *chunk; |
570 | |
571 | if (payload) { |
572 | *payload = NULL; |
573 | } |
574 | *request_ret = 0; |
575 | |
576 | /* Wait until we're woken up by nbd_connection_entry. */ |
577 | s->requests[i].receiving = true; |
578 | qemu_coroutine_yield(); |
579 | s->requests[i].receiving = false; |
580 | if (s->state != NBD_CLIENT_CONNECTED) { |
581 | error_setg(errp, "Connection closed" ); |
582 | return -EIO; |
583 | } |
584 | assert(s->ioc); |
585 | |
586 | assert(s->reply.handle == handle); |
587 | |
588 | if (nbd_reply_is_simple(&s->reply)) { |
589 | if (only_structured) { |
590 | error_setg(errp, "Protocol error: simple reply when structured " |
591 | "reply chunk was expected" ); |
592 | return -EINVAL; |
593 | } |
594 | |
595 | *request_ret = -nbd_errno_to_system_errno(s->reply.simple.error); |
596 | if (*request_ret < 0 || !qiov) { |
597 | return 0; |
598 | } |
599 | |
600 | return qio_channel_readv_all(s->ioc, qiov->iov, qiov->niov, |
601 | errp) < 0 ? -EIO : 0; |
602 | } |
603 | |
604 | /* handle structured reply chunk */ |
605 | assert(s->info.structured_reply); |
606 | chunk = &s->reply.structured; |
607 | |
608 | if (chunk->type == NBD_REPLY_TYPE_NONE) { |
609 | if (!(chunk->flags & NBD_REPLY_FLAG_DONE)) { |
610 | error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk without" |
611 | " NBD_REPLY_FLAG_DONE flag set" ); |
612 | return -EINVAL; |
613 | } |
614 | if (chunk->length) { |
615 | error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk with" |
616 | " nonzero length" ); |
617 | return -EINVAL; |
618 | } |
619 | return 0; |
620 | } |
621 | |
622 | if (chunk->type == NBD_REPLY_TYPE_OFFSET_DATA) { |
623 | if (!qiov) { |
624 | error_setg(errp, "Unexpected NBD_REPLY_TYPE_OFFSET_DATA chunk" ); |
625 | return -EINVAL; |
626 | } |
627 | |
628 | return nbd_co_receive_offset_data_payload(s, s->requests[i].offset, |
629 | qiov, errp); |
630 | } |
631 | |
632 | if (nbd_reply_type_is_error(chunk->type)) { |
633 | payload = &local_payload; |
634 | } |
635 | |
636 | ret = nbd_co_receive_structured_payload(s, payload, errp); |
637 | if (ret < 0) { |
638 | return ret; |
639 | } |
640 | |
641 | if (nbd_reply_type_is_error(chunk->type)) { |
642 | ret = nbd_parse_error_payload(chunk, local_payload, request_ret, errp); |
643 | g_free(local_payload); |
644 | return ret; |
645 | } |
646 | |
647 | return 0; |
648 | } |
649 | |
650 | /* |
651 | * nbd_co_receive_one_chunk |
652 | * Read reply, wake up connection_co and set s->quit if needed. |
653 | * Return value is a fatal error code or normal nbd reply error code |
654 | */ |
655 | static coroutine_fn int nbd_co_receive_one_chunk( |
656 | BDRVNBDState *s, uint64_t handle, bool only_structured, |
657 | int *request_ret, QEMUIOVector *qiov, NBDReply *reply, void **payload, |
658 | Error **errp) |
659 | { |
660 | int ret = nbd_co_do_receive_one_chunk(s, handle, only_structured, |
661 | request_ret, qiov, payload, errp); |
662 | |
663 | if (ret < 0) { |
664 | memset(reply, 0, sizeof(*reply)); |
665 | nbd_channel_error(s, ret); |
666 | } else { |
667 | /* For assert at loop start in nbd_connection_entry */ |
668 | *reply = s->reply; |
669 | s->reply.handle = 0; |
670 | } |
671 | |
672 | if (s->connection_co) { |
673 | aio_co_wake(s->connection_co); |
674 | } |
675 | |
676 | return ret; |
677 | } |
678 | |
679 | typedef struct NBDReplyChunkIter { |
680 | int ret; |
681 | int request_ret; |
682 | Error *err; |
683 | bool done, only_structured; |
684 | } NBDReplyChunkIter; |
685 | |
686 | static void nbd_iter_channel_error(NBDReplyChunkIter *iter, |
687 | int ret, Error **local_err) |
688 | { |
689 | assert(ret < 0); |
690 | |
691 | if (!iter->ret) { |
692 | iter->ret = ret; |
693 | error_propagate(&iter->err, *local_err); |
694 | } else { |
695 | error_free(*local_err); |
696 | } |
697 | |
698 | *local_err = NULL; |
699 | } |
700 | |
701 | static void nbd_iter_request_error(NBDReplyChunkIter *iter, int ret) |
702 | { |
703 | assert(ret < 0); |
704 | |
705 | if (!iter->request_ret) { |
706 | iter->request_ret = ret; |
707 | } |
708 | } |
709 | |
710 | /* |
711 | * NBD_FOREACH_REPLY_CHUNK |
712 | * The pointer stored in @payload requires g_free() to free it. |
713 | */ |
714 | #define NBD_FOREACH_REPLY_CHUNK(s, iter, handle, structured, \ |
715 | qiov, reply, payload) \ |
716 | for (iter = (NBDReplyChunkIter) { .only_structured = structured }; \ |
717 | nbd_reply_chunk_iter_receive(s, &iter, handle, qiov, reply, payload);) |
718 | |
719 | /* |
720 | * nbd_reply_chunk_iter_receive |
721 | * The pointer stored in @payload requires g_free() to free it. |
722 | */ |
723 | static bool nbd_reply_chunk_iter_receive(BDRVNBDState *s, |
724 | NBDReplyChunkIter *iter, |
725 | uint64_t handle, |
726 | QEMUIOVector *qiov, NBDReply *reply, |
727 | void **payload) |
728 | { |
729 | int ret, request_ret; |
730 | NBDReply local_reply; |
731 | NBDStructuredReplyChunk *chunk; |
732 | Error *local_err = NULL; |
733 | if (s->state != NBD_CLIENT_CONNECTED) { |
734 | error_setg(&local_err, "Connection closed" ); |
735 | nbd_iter_channel_error(iter, -EIO, &local_err); |
736 | goto break_loop; |
737 | } |
738 | |
739 | if (iter->done) { |
740 | /* Previous iteration was last. */ |
741 | goto break_loop; |
742 | } |
743 | |
744 | if (reply == NULL) { |
745 | reply = &local_reply; |
746 | } |
747 | |
748 | ret = nbd_co_receive_one_chunk(s, handle, iter->only_structured, |
749 | &request_ret, qiov, reply, payload, |
750 | &local_err); |
751 | if (ret < 0) { |
752 | nbd_iter_channel_error(iter, ret, &local_err); |
753 | } else if (request_ret < 0) { |
754 | nbd_iter_request_error(iter, request_ret); |
755 | } |
756 | |
757 | /* Do not execute the body of NBD_FOREACH_REPLY_CHUNK for simple reply. */ |
758 | if (nbd_reply_is_simple(reply) || s->state != NBD_CLIENT_CONNECTED) { |
759 | goto break_loop; |
760 | } |
761 | |
762 | chunk = &reply->structured; |
763 | iter->only_structured = true; |
764 | |
765 | if (chunk->type == NBD_REPLY_TYPE_NONE) { |
766 | /* NBD_REPLY_FLAG_DONE is already checked in nbd_co_receive_one_chunk */ |
767 | assert(chunk->flags & NBD_REPLY_FLAG_DONE); |
768 | goto break_loop; |
769 | } |
770 | |
771 | if (chunk->flags & NBD_REPLY_FLAG_DONE) { |
772 | /* This iteration is last. */ |
773 | iter->done = true; |
774 | } |
775 | |
776 | /* Execute the loop body */ |
777 | return true; |
778 | |
779 | break_loop: |
780 | s->requests[HANDLE_TO_INDEX(s, handle)].coroutine = NULL; |
781 | |
782 | qemu_co_mutex_lock(&s->send_mutex); |
783 | s->in_flight--; |
784 | qemu_co_queue_next(&s->free_sema); |
785 | qemu_co_mutex_unlock(&s->send_mutex); |
786 | |
787 | return false; |
788 | } |
789 | |
790 | static int nbd_co_receive_return_code(BDRVNBDState *s, uint64_t handle, |
791 | int *request_ret, Error **errp) |
792 | { |
793 | NBDReplyChunkIter iter; |
794 | |
795 | NBD_FOREACH_REPLY_CHUNK(s, iter, handle, false, NULL, NULL, NULL) { |
796 | /* nbd_reply_chunk_iter_receive does all the work */ |
797 | } |
798 | |
799 | error_propagate(errp, iter.err); |
800 | *request_ret = iter.request_ret; |
801 | return iter.ret; |
802 | } |
803 | |
804 | static int nbd_co_receive_cmdread_reply(BDRVNBDState *s, uint64_t handle, |
805 | uint64_t offset, QEMUIOVector *qiov, |
806 | int *request_ret, Error **errp) |
807 | { |
808 | NBDReplyChunkIter iter; |
809 | NBDReply reply; |
810 | void *payload = NULL; |
811 | Error *local_err = NULL; |
812 | |
813 | NBD_FOREACH_REPLY_CHUNK(s, iter, handle, s->info.structured_reply, |
814 | qiov, &reply, &payload) |
815 | { |
816 | int ret; |
817 | NBDStructuredReplyChunk *chunk = &reply.structured; |
818 | |
819 | assert(nbd_reply_is_structured(&reply)); |
820 | |
821 | switch (chunk->type) { |
822 | case NBD_REPLY_TYPE_OFFSET_DATA: |
823 | /* |
824 | * special cased in nbd_co_receive_one_chunk, data is already |
825 | * in qiov |
826 | */ |
827 | break; |
828 | case NBD_REPLY_TYPE_OFFSET_HOLE: |
829 | ret = nbd_parse_offset_hole_payload(s, &reply.structured, payload, |
830 | offset, qiov, &local_err); |
831 | if (ret < 0) { |
832 | nbd_channel_error(s, ret); |
833 | nbd_iter_channel_error(&iter, ret, &local_err); |
834 | } |
835 | break; |
836 | default: |
837 | if (!nbd_reply_type_is_error(chunk->type)) { |
838 | /* not allowed reply type */ |
839 | nbd_channel_error(s, -EINVAL); |
840 | error_setg(&local_err, |
841 | "Unexpected reply type: %d (%s) for CMD_READ" , |
842 | chunk->type, nbd_reply_type_lookup(chunk->type)); |
843 | nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
844 | } |
845 | } |
846 | |
847 | g_free(payload); |
848 | payload = NULL; |
849 | } |
850 | |
851 | error_propagate(errp, iter.err); |
852 | *request_ret = iter.request_ret; |
853 | return iter.ret; |
854 | } |
855 | |
856 | static int nbd_co_receive_blockstatus_reply(BDRVNBDState *s, |
857 | uint64_t handle, uint64_t length, |
858 | NBDExtent *extent, |
859 | int *request_ret, Error **errp) |
860 | { |
861 | NBDReplyChunkIter iter; |
862 | NBDReply reply; |
863 | void *payload = NULL; |
864 | Error *local_err = NULL; |
865 | bool received = false; |
866 | |
867 | assert(!extent->length); |
868 | NBD_FOREACH_REPLY_CHUNK(s, iter, handle, false, NULL, &reply, &payload) { |
869 | int ret; |
870 | NBDStructuredReplyChunk *chunk = &reply.structured; |
871 | |
872 | assert(nbd_reply_is_structured(&reply)); |
873 | |
874 | switch (chunk->type) { |
875 | case NBD_REPLY_TYPE_BLOCK_STATUS: |
876 | if (received) { |
877 | nbd_channel_error(s, -EINVAL); |
878 | error_setg(&local_err, "Several BLOCK_STATUS chunks in reply" ); |
879 | nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
880 | } |
881 | received = true; |
882 | |
883 | ret = nbd_parse_blockstatus_payload(s, &reply.structured, |
884 | payload, length, extent, |
885 | &local_err); |
886 | if (ret < 0) { |
887 | nbd_channel_error(s, ret); |
888 | nbd_iter_channel_error(&iter, ret, &local_err); |
889 | } |
890 | break; |
891 | default: |
892 | if (!nbd_reply_type_is_error(chunk->type)) { |
893 | nbd_channel_error(s, -EINVAL); |
894 | error_setg(&local_err, |
895 | "Unexpected reply type: %d (%s) " |
896 | "for CMD_BLOCK_STATUS" , |
897 | chunk->type, nbd_reply_type_lookup(chunk->type)); |
898 | nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
899 | } |
900 | } |
901 | |
902 | g_free(payload); |
903 | payload = NULL; |
904 | } |
905 | |
906 | if (!extent->length && !iter.request_ret) { |
907 | error_setg(&local_err, "Server did not reply with any status extents" ); |
908 | nbd_iter_channel_error(&iter, -EIO, &local_err); |
909 | } |
910 | |
911 | error_propagate(errp, iter.err); |
912 | *request_ret = iter.request_ret; |
913 | return iter.ret; |
914 | } |
915 | |
916 | static int nbd_co_request(BlockDriverState *bs, NBDRequest *request, |
917 | QEMUIOVector *write_qiov) |
918 | { |
919 | int ret, request_ret; |
920 | Error *local_err = NULL; |
921 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
922 | |
923 | assert(request->type != NBD_CMD_READ); |
924 | if (write_qiov) { |
925 | assert(request->type == NBD_CMD_WRITE); |
926 | assert(request->len == iov_size(write_qiov->iov, write_qiov->niov)); |
927 | } else { |
928 | assert(request->type != NBD_CMD_WRITE); |
929 | } |
930 | ret = nbd_co_send_request(bs, request, write_qiov); |
931 | if (ret < 0) { |
932 | return ret; |
933 | } |
934 | |
935 | ret = nbd_co_receive_return_code(s, request->handle, |
936 | &request_ret, &local_err); |
937 | if (local_err) { |
938 | trace_nbd_co_request_fail(request->from, request->len, request->handle, |
939 | request->flags, request->type, |
940 | nbd_cmd_lookup(request->type), |
941 | ret, error_get_pretty(local_err)); |
942 | error_free(local_err); |
943 | } |
944 | return ret ? ret : request_ret; |
945 | } |
946 | |
947 | static int nbd_client_co_preadv(BlockDriverState *bs, uint64_t offset, |
948 | uint64_t bytes, QEMUIOVector *qiov, int flags) |
949 | { |
950 | int ret, request_ret; |
951 | Error *local_err = NULL; |
952 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
953 | NBDRequest request = { |
954 | .type = NBD_CMD_READ, |
955 | .from = offset, |
956 | .len = bytes, |
957 | }; |
958 | |
959 | assert(bytes <= NBD_MAX_BUFFER_SIZE); |
960 | assert(!flags); |
961 | |
962 | if (!bytes) { |
963 | return 0; |
964 | } |
965 | /* |
966 | * Work around the fact that the block layer doesn't do |
967 | * byte-accurate sizing yet - if the read exceeds the server's |
968 | * advertised size because the block layer rounded size up, then |
969 | * truncate the request to the server and tail-pad with zero. |
970 | */ |
971 | if (offset >= s->info.size) { |
972 | assert(bytes < BDRV_SECTOR_SIZE); |
973 | qemu_iovec_memset(qiov, 0, 0, bytes); |
974 | return 0; |
975 | } |
976 | if (offset + bytes > s->info.size) { |
977 | uint64_t slop = offset + bytes - s->info.size; |
978 | |
979 | assert(slop < BDRV_SECTOR_SIZE); |
980 | qemu_iovec_memset(qiov, bytes - slop, 0, slop); |
981 | request.len -= slop; |
982 | } |
983 | |
984 | ret = nbd_co_send_request(bs, &request, NULL); |
985 | if (ret < 0) { |
986 | return ret; |
987 | } |
988 | |
989 | ret = nbd_co_receive_cmdread_reply(s, request.handle, offset, qiov, |
990 | &request_ret, &local_err); |
991 | if (local_err) { |
992 | trace_nbd_co_request_fail(request.from, request.len, request.handle, |
993 | request.flags, request.type, |
994 | nbd_cmd_lookup(request.type), |
995 | ret, error_get_pretty(local_err)); |
996 | error_free(local_err); |
997 | } |
998 | return ret ? ret : request_ret; |
999 | } |
1000 | |
1001 | static int nbd_client_co_pwritev(BlockDriverState *bs, uint64_t offset, |
1002 | uint64_t bytes, QEMUIOVector *qiov, int flags) |
1003 | { |
1004 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
1005 | NBDRequest request = { |
1006 | .type = NBD_CMD_WRITE, |
1007 | .from = offset, |
1008 | .len = bytes, |
1009 | }; |
1010 | |
1011 | assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); |
1012 | if (flags & BDRV_REQ_FUA) { |
1013 | assert(s->info.flags & NBD_FLAG_SEND_FUA); |
1014 | request.flags |= NBD_CMD_FLAG_FUA; |
1015 | } |
1016 | |
1017 | assert(bytes <= NBD_MAX_BUFFER_SIZE); |
1018 | |
1019 | if (!bytes) { |
1020 | return 0; |
1021 | } |
1022 | return nbd_co_request(bs, &request, qiov); |
1023 | } |
1024 | |
1025 | static int nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, |
1026 | int bytes, BdrvRequestFlags flags) |
1027 | { |
1028 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
1029 | NBDRequest request = { |
1030 | .type = NBD_CMD_WRITE_ZEROES, |
1031 | .from = offset, |
1032 | .len = bytes, |
1033 | }; |
1034 | |
1035 | assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); |
1036 | if (!(s->info.flags & NBD_FLAG_SEND_WRITE_ZEROES)) { |
1037 | return -ENOTSUP; |
1038 | } |
1039 | |
1040 | if (flags & BDRV_REQ_FUA) { |
1041 | assert(s->info.flags & NBD_FLAG_SEND_FUA); |
1042 | request.flags |= NBD_CMD_FLAG_FUA; |
1043 | } |
1044 | if (!(flags & BDRV_REQ_MAY_UNMAP)) { |
1045 | request.flags |= NBD_CMD_FLAG_NO_HOLE; |
1046 | } |
1047 | |
1048 | if (!bytes) { |
1049 | return 0; |
1050 | } |
1051 | return nbd_co_request(bs, &request, NULL); |
1052 | } |
1053 | |
1054 | static int nbd_client_co_flush(BlockDriverState *bs) |
1055 | { |
1056 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
1057 | NBDRequest request = { .type = NBD_CMD_FLUSH }; |
1058 | |
1059 | if (!(s->info.flags & NBD_FLAG_SEND_FLUSH)) { |
1060 | return 0; |
1061 | } |
1062 | |
1063 | request.from = 0; |
1064 | request.len = 0; |
1065 | |
1066 | return nbd_co_request(bs, &request, NULL); |
1067 | } |
1068 | |
1069 | static int nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset, |
1070 | int bytes) |
1071 | { |
1072 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
1073 | NBDRequest request = { |
1074 | .type = NBD_CMD_TRIM, |
1075 | .from = offset, |
1076 | .len = bytes, |
1077 | }; |
1078 | |
1079 | assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); |
1080 | if (!(s->info.flags & NBD_FLAG_SEND_TRIM) || !bytes) { |
1081 | return 0; |
1082 | } |
1083 | |
1084 | return nbd_co_request(bs, &request, NULL); |
1085 | } |
1086 | |
1087 | static int coroutine_fn nbd_client_co_block_status( |
1088 | BlockDriverState *bs, bool want_zero, int64_t offset, int64_t bytes, |
1089 | int64_t *pnum, int64_t *map, BlockDriverState **file) |
1090 | { |
1091 | int ret, request_ret; |
1092 | NBDExtent extent = { 0 }; |
1093 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
1094 | Error *local_err = NULL; |
1095 | |
1096 | NBDRequest request = { |
1097 | .type = NBD_CMD_BLOCK_STATUS, |
1098 | .from = offset, |
1099 | .len = MIN(MIN_NON_ZERO(QEMU_ALIGN_DOWN(INT_MAX, |
1100 | bs->bl.request_alignment), |
1101 | s->info.max_block), |
1102 | MIN(bytes, s->info.size - offset)), |
1103 | .flags = NBD_CMD_FLAG_REQ_ONE, |
1104 | }; |
1105 | |
1106 | if (!s->info.base_allocation) { |
1107 | *pnum = bytes; |
1108 | *map = offset; |
1109 | *file = bs; |
1110 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
1111 | } |
1112 | |
1113 | /* |
1114 | * Work around the fact that the block layer doesn't do |
1115 | * byte-accurate sizing yet - if the status request exceeds the |
1116 | * server's advertised size because the block layer rounded size |
1117 | * up, we truncated the request to the server (above), or are |
1118 | * called on just the hole. |
1119 | */ |
1120 | if (offset >= s->info.size) { |
1121 | *pnum = bytes; |
1122 | assert(bytes < BDRV_SECTOR_SIZE); |
1123 | /* Intentionally don't report offset_valid for the hole */ |
1124 | return BDRV_BLOCK_ZERO; |
1125 | } |
1126 | |
1127 | if (s->info.min_block) { |
1128 | assert(QEMU_IS_ALIGNED(request.len, s->info.min_block)); |
1129 | } |
1130 | ret = nbd_co_send_request(bs, &request, NULL); |
1131 | if (ret < 0) { |
1132 | return ret; |
1133 | } |
1134 | |
1135 | ret = nbd_co_receive_blockstatus_reply(s, request.handle, bytes, |
1136 | &extent, &request_ret, &local_err); |
1137 | if (local_err) { |
1138 | trace_nbd_co_request_fail(request.from, request.len, request.handle, |
1139 | request.flags, request.type, |
1140 | nbd_cmd_lookup(request.type), |
1141 | ret, error_get_pretty(local_err)); |
1142 | error_free(local_err); |
1143 | } |
1144 | if (ret < 0 || request_ret < 0) { |
1145 | return ret ? ret : request_ret; |
1146 | } |
1147 | |
1148 | assert(extent.length); |
1149 | *pnum = extent.length; |
1150 | *map = offset; |
1151 | *file = bs; |
1152 | return (extent.flags & NBD_STATE_HOLE ? 0 : BDRV_BLOCK_DATA) | |
1153 | (extent.flags & NBD_STATE_ZERO ? BDRV_BLOCK_ZERO : 0) | |
1154 | BDRV_BLOCK_OFFSET_VALID; |
1155 | } |
1156 | |
1157 | static void nbd_client_close(BlockDriverState *bs) |
1158 | { |
1159 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
1160 | NBDRequest request = { .type = NBD_CMD_DISC }; |
1161 | |
1162 | assert(s->ioc); |
1163 | |
1164 | nbd_send_request(s->ioc, &request); |
1165 | |
1166 | nbd_teardown_connection(bs); |
1167 | } |
1168 | |
1169 | static QIOChannelSocket *nbd_establish_connection(SocketAddress *saddr, |
1170 | Error **errp) |
1171 | { |
1172 | QIOChannelSocket *sioc; |
1173 | Error *local_err = NULL; |
1174 | |
1175 | sioc = qio_channel_socket_new(); |
1176 | qio_channel_set_name(QIO_CHANNEL(sioc), "nbd-client" ); |
1177 | |
1178 | qio_channel_socket_connect_sync(sioc, saddr, &local_err); |
1179 | if (local_err) { |
1180 | object_unref(OBJECT(sioc)); |
1181 | error_propagate(errp, local_err); |
1182 | return NULL; |
1183 | } |
1184 | |
1185 | qio_channel_set_delay(QIO_CHANNEL(sioc), false); |
1186 | |
1187 | return sioc; |
1188 | } |
1189 | |
1190 | static int nbd_client_connect(BlockDriverState *bs, Error **errp) |
1191 | { |
1192 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
1193 | AioContext *aio_context = bdrv_get_aio_context(bs); |
1194 | int ret; |
1195 | |
1196 | /* |
1197 | * establish TCP connection, return error if it fails |
1198 | * TODO: Configurable retry-until-timeout behaviour. |
1199 | */ |
1200 | QIOChannelSocket *sioc = nbd_establish_connection(s->saddr, errp); |
1201 | |
1202 | if (!sioc) { |
1203 | return -ECONNREFUSED; |
1204 | } |
1205 | |
1206 | /* NBD handshake */ |
1207 | trace_nbd_client_connect(s->export); |
1208 | qio_channel_set_blocking(QIO_CHANNEL(sioc), false, NULL); |
1209 | qio_channel_attach_aio_context(QIO_CHANNEL(sioc), aio_context); |
1210 | |
1211 | s->info.request_sizes = true; |
1212 | s->info.structured_reply = true; |
1213 | s->info.base_allocation = true; |
1214 | s->info.x_dirty_bitmap = g_strdup(s->x_dirty_bitmap); |
1215 | s->info.name = g_strdup(s->export ?: "" ); |
1216 | ret = nbd_receive_negotiate(aio_context, QIO_CHANNEL(sioc), s->tlscreds, |
1217 | s->hostname, &s->ioc, &s->info, errp); |
1218 | g_free(s->info.x_dirty_bitmap); |
1219 | g_free(s->info.name); |
1220 | if (ret < 0) { |
1221 | object_unref(OBJECT(sioc)); |
1222 | return ret; |
1223 | } |
1224 | if (s->x_dirty_bitmap && !s->info.base_allocation) { |
1225 | error_setg(errp, "requested x-dirty-bitmap %s not found" , |
1226 | s->x_dirty_bitmap); |
1227 | ret = -EINVAL; |
1228 | goto fail; |
1229 | } |
1230 | if (s->info.flags & NBD_FLAG_READ_ONLY) { |
1231 | ret = bdrv_apply_auto_read_only(bs, "NBD export is read-only" , errp); |
1232 | if (ret < 0) { |
1233 | goto fail; |
1234 | } |
1235 | } |
1236 | if (s->info.flags & NBD_FLAG_SEND_FUA) { |
1237 | bs->supported_write_flags = BDRV_REQ_FUA; |
1238 | bs->supported_zero_flags |= BDRV_REQ_FUA; |
1239 | } |
1240 | if (s->info.flags & NBD_FLAG_SEND_WRITE_ZEROES) { |
1241 | bs->supported_zero_flags |= BDRV_REQ_MAY_UNMAP; |
1242 | } |
1243 | |
1244 | s->sioc = sioc; |
1245 | |
1246 | if (!s->ioc) { |
1247 | s->ioc = QIO_CHANNEL(sioc); |
1248 | object_ref(OBJECT(s->ioc)); |
1249 | } |
1250 | |
1251 | trace_nbd_client_connect_success(s->export); |
1252 | |
1253 | return 0; |
1254 | |
1255 | fail: |
1256 | /* |
1257 | * We have connected, but must fail for other reasons. |
1258 | * Send NBD_CMD_DISC as a courtesy to the server. |
1259 | */ |
1260 | { |
1261 | NBDRequest request = { .type = NBD_CMD_DISC }; |
1262 | |
1263 | nbd_send_request(s->ioc ?: QIO_CHANNEL(sioc), &request); |
1264 | |
1265 | object_unref(OBJECT(sioc)); |
1266 | |
1267 | return ret; |
1268 | } |
1269 | } |
1270 | |
1271 | /* |
1272 | * Parse nbd_open options |
1273 | */ |
1274 | |
1275 | static int nbd_parse_uri(const char *filename, QDict *options) |
1276 | { |
1277 | URI *uri; |
1278 | const char *p; |
1279 | QueryParams *qp = NULL; |
1280 | int ret = 0; |
1281 | bool is_unix; |
1282 | |
1283 | uri = uri_parse(filename); |
1284 | if (!uri) { |
1285 | return -EINVAL; |
1286 | } |
1287 | |
1288 | /* transport */ |
1289 | if (!g_strcmp0(uri->scheme, "nbd" )) { |
1290 | is_unix = false; |
1291 | } else if (!g_strcmp0(uri->scheme, "nbd+tcp" )) { |
1292 | is_unix = false; |
1293 | } else if (!g_strcmp0(uri->scheme, "nbd+unix" )) { |
1294 | is_unix = true; |
1295 | } else { |
1296 | ret = -EINVAL; |
1297 | goto out; |
1298 | } |
1299 | |
1300 | p = uri->path ? uri->path : "/" ; |
1301 | p += strspn(p, "/" ); |
1302 | if (p[0]) { |
1303 | qdict_put_str(options, "export" , p); |
1304 | } |
1305 | |
1306 | qp = query_params_parse(uri->query); |
1307 | if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) { |
1308 | ret = -EINVAL; |
1309 | goto out; |
1310 | } |
1311 | |
1312 | if (is_unix) { |
1313 | /* nbd+unix:///export?socket=path */ |
1314 | if (uri->server || uri->port || strcmp(qp->p[0].name, "socket" )) { |
1315 | ret = -EINVAL; |
1316 | goto out; |
1317 | } |
1318 | qdict_put_str(options, "server.type" , "unix" ); |
1319 | qdict_put_str(options, "server.path" , qp->p[0].value); |
1320 | } else { |
1321 | QString *host; |
1322 | char *port_str; |
1323 | |
1324 | /* nbd[+tcp]://host[:port]/export */ |
1325 | if (!uri->server) { |
1326 | ret = -EINVAL; |
1327 | goto out; |
1328 | } |
1329 | |
1330 | /* strip braces from literal IPv6 address */ |
1331 | if (uri->server[0] == '[') { |
1332 | host = qstring_from_substr(uri->server, 1, |
1333 | strlen(uri->server) - 1); |
1334 | } else { |
1335 | host = qstring_from_str(uri->server); |
1336 | } |
1337 | |
1338 | qdict_put_str(options, "server.type" , "inet" ); |
1339 | qdict_put(options, "server.host" , host); |
1340 | |
1341 | port_str = g_strdup_printf("%d" , uri->port ?: NBD_DEFAULT_PORT); |
1342 | qdict_put_str(options, "server.port" , port_str); |
1343 | g_free(port_str); |
1344 | } |
1345 | |
1346 | out: |
1347 | if (qp) { |
1348 | query_params_free(qp); |
1349 | } |
1350 | uri_free(uri); |
1351 | return ret; |
1352 | } |
1353 | |
1354 | static bool nbd_has_filename_options_conflict(QDict *options, Error **errp) |
1355 | { |
1356 | const QDictEntry *e; |
1357 | |
1358 | for (e = qdict_first(options); e; e = qdict_next(options, e)) { |
1359 | if (!strcmp(e->key, "host" ) || |
1360 | !strcmp(e->key, "port" ) || |
1361 | !strcmp(e->key, "path" ) || |
1362 | !strcmp(e->key, "export" ) || |
1363 | strstart(e->key, "server." , NULL)) |
1364 | { |
1365 | error_setg(errp, "Option '%s' cannot be used with a file name" , |
1366 | e->key); |
1367 | return true; |
1368 | } |
1369 | } |
1370 | |
1371 | return false; |
1372 | } |
1373 | |
1374 | static void nbd_parse_filename(const char *filename, QDict *options, |
1375 | Error **errp) |
1376 | { |
1377 | char *file; |
1378 | char *export_name; |
1379 | const char *host_spec; |
1380 | const char *unixpath; |
1381 | |
1382 | if (nbd_has_filename_options_conflict(options, errp)) { |
1383 | return; |
1384 | } |
1385 | |
1386 | if (strstr(filename, "://" )) { |
1387 | int ret = nbd_parse_uri(filename, options); |
1388 | if (ret < 0) { |
1389 | error_setg(errp, "No valid URL specified" ); |
1390 | } |
1391 | return; |
1392 | } |
1393 | |
1394 | file = g_strdup(filename); |
1395 | |
1396 | export_name = strstr(file, EN_OPTSTR); |
1397 | if (export_name) { |
1398 | if (export_name[strlen(EN_OPTSTR)] == 0) { |
1399 | goto out; |
1400 | } |
1401 | export_name[0] = 0; /* truncate 'file' */ |
1402 | export_name += strlen(EN_OPTSTR); |
1403 | |
1404 | qdict_put_str(options, "export" , export_name); |
1405 | } |
1406 | |
1407 | /* extract the host_spec - fail if it's not nbd:... */ |
1408 | if (!strstart(file, "nbd:" , &host_spec)) { |
1409 | error_setg(errp, "File name string for NBD must start with 'nbd:'" ); |
1410 | goto out; |
1411 | } |
1412 | |
1413 | if (!*host_spec) { |
1414 | goto out; |
1415 | } |
1416 | |
1417 | /* are we a UNIX or TCP socket? */ |
1418 | if (strstart(host_spec, "unix:" , &unixpath)) { |
1419 | qdict_put_str(options, "server.type" , "unix" ); |
1420 | qdict_put_str(options, "server.path" , unixpath); |
1421 | } else { |
1422 | InetSocketAddress *addr = g_new(InetSocketAddress, 1); |
1423 | |
1424 | if (inet_parse(addr, host_spec, errp)) { |
1425 | goto out_inet; |
1426 | } |
1427 | |
1428 | qdict_put_str(options, "server.type" , "inet" ); |
1429 | qdict_put_str(options, "server.host" , addr->host); |
1430 | qdict_put_str(options, "server.port" , addr->port); |
1431 | out_inet: |
1432 | qapi_free_InetSocketAddress(addr); |
1433 | } |
1434 | |
1435 | out: |
1436 | g_free(file); |
1437 | } |
1438 | |
1439 | static bool nbd_process_legacy_socket_options(QDict *output_options, |
1440 | QemuOpts *legacy_opts, |
1441 | Error **errp) |
1442 | { |
1443 | const char *path = qemu_opt_get(legacy_opts, "path" ); |
1444 | const char *host = qemu_opt_get(legacy_opts, "host" ); |
1445 | const char *port = qemu_opt_get(legacy_opts, "port" ); |
1446 | const QDictEntry *e; |
1447 | |
1448 | if (!path && !host && !port) { |
1449 | return true; |
1450 | } |
1451 | |
1452 | for (e = qdict_first(output_options); e; e = qdict_next(output_options, e)) |
1453 | { |
1454 | if (strstart(e->key, "server." , NULL)) { |
1455 | error_setg(errp, "Cannot use 'server' and path/host/port at the " |
1456 | "same time" ); |
1457 | return false; |
1458 | } |
1459 | } |
1460 | |
1461 | if (path && host) { |
1462 | error_setg(errp, "path and host may not be used at the same time" ); |
1463 | return false; |
1464 | } else if (path) { |
1465 | if (port) { |
1466 | error_setg(errp, "port may not be used without host" ); |
1467 | return false; |
1468 | } |
1469 | |
1470 | qdict_put_str(output_options, "server.type" , "unix" ); |
1471 | qdict_put_str(output_options, "server.path" , path); |
1472 | } else if (host) { |
1473 | qdict_put_str(output_options, "server.type" , "inet" ); |
1474 | qdict_put_str(output_options, "server.host" , host); |
1475 | qdict_put_str(output_options, "server.port" , |
1476 | port ?: stringify(NBD_DEFAULT_PORT)); |
1477 | } |
1478 | |
1479 | return true; |
1480 | } |
1481 | |
1482 | static SocketAddress *nbd_config(BDRVNBDState *s, QDict *options, |
1483 | Error **errp) |
1484 | { |
1485 | SocketAddress *saddr = NULL; |
1486 | QDict *addr = NULL; |
1487 | Visitor *iv = NULL; |
1488 | Error *local_err = NULL; |
1489 | |
1490 | qdict_extract_subqdict(options, &addr, "server." ); |
1491 | if (!qdict_size(addr)) { |
1492 | error_setg(errp, "NBD server address missing" ); |
1493 | goto done; |
1494 | } |
1495 | |
1496 | iv = qobject_input_visitor_new_flat_confused(addr, errp); |
1497 | if (!iv) { |
1498 | goto done; |
1499 | } |
1500 | |
1501 | visit_type_SocketAddress(iv, NULL, &saddr, &local_err); |
1502 | if (local_err) { |
1503 | error_propagate(errp, local_err); |
1504 | goto done; |
1505 | } |
1506 | |
1507 | done: |
1508 | qobject_unref(addr); |
1509 | visit_free(iv); |
1510 | return saddr; |
1511 | } |
1512 | |
1513 | static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) |
1514 | { |
1515 | Object *obj; |
1516 | QCryptoTLSCreds *creds; |
1517 | |
1518 | obj = object_resolve_path_component( |
1519 | object_get_objects_root(), id); |
1520 | if (!obj) { |
1521 | error_setg(errp, "No TLS credentials with id '%s'" , |
1522 | id); |
1523 | return NULL; |
1524 | } |
1525 | creds = (QCryptoTLSCreds *) |
1526 | object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); |
1527 | if (!creds) { |
1528 | error_setg(errp, "Object with id '%s' is not TLS credentials" , |
1529 | id); |
1530 | return NULL; |
1531 | } |
1532 | |
1533 | if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) { |
1534 | error_setg(errp, |
1535 | "Expecting TLS credentials with a client endpoint" ); |
1536 | return NULL; |
1537 | } |
1538 | object_ref(obj); |
1539 | return creds; |
1540 | } |
1541 | |
1542 | |
1543 | static QemuOptsList nbd_runtime_opts = { |
1544 | .name = "nbd" , |
1545 | .head = QTAILQ_HEAD_INITIALIZER(nbd_runtime_opts.head), |
1546 | .desc = { |
1547 | { |
1548 | .name = "host" , |
1549 | .type = QEMU_OPT_STRING, |
1550 | .help = "TCP host to connect to" , |
1551 | }, |
1552 | { |
1553 | .name = "port" , |
1554 | .type = QEMU_OPT_STRING, |
1555 | .help = "TCP port to connect to" , |
1556 | }, |
1557 | { |
1558 | .name = "path" , |
1559 | .type = QEMU_OPT_STRING, |
1560 | .help = "Unix socket path to connect to" , |
1561 | }, |
1562 | { |
1563 | .name = "export" , |
1564 | .type = QEMU_OPT_STRING, |
1565 | .help = "Name of the NBD export to open" , |
1566 | }, |
1567 | { |
1568 | .name = "tls-creds" , |
1569 | .type = QEMU_OPT_STRING, |
1570 | .help = "ID of the TLS credentials to use" , |
1571 | }, |
1572 | { |
1573 | .name = "x-dirty-bitmap" , |
1574 | .type = QEMU_OPT_STRING, |
1575 | .help = "experimental: expose named dirty bitmap in place of " |
1576 | "block status" , |
1577 | }, |
1578 | { |
1579 | .name = "reconnect-delay" , |
1580 | .type = QEMU_OPT_NUMBER, |
1581 | .help = "On an unexpected disconnect, the nbd client tries to " |
1582 | "connect again until succeeding or encountering a serious " |
1583 | "error. During the first @reconnect-delay seconds, all " |
1584 | "requests are paused and will be rerun on a successful " |
1585 | "reconnect. After that time, any delayed requests and all " |
1586 | "future requests before a successful reconnect will " |
1587 | "immediately fail. Default 0" , |
1588 | }, |
1589 | { /* end of list */ } |
1590 | }, |
1591 | }; |
1592 | |
1593 | static int nbd_process_options(BlockDriverState *bs, QDict *options, |
1594 | Error **errp) |
1595 | { |
1596 | BDRVNBDState *s = bs->opaque; |
1597 | QemuOpts *opts; |
1598 | Error *local_err = NULL; |
1599 | int ret = -EINVAL; |
1600 | |
1601 | opts = qemu_opts_create(&nbd_runtime_opts, NULL, 0, &error_abort); |
1602 | qemu_opts_absorb_qdict(opts, options, &local_err); |
1603 | if (local_err) { |
1604 | error_propagate(errp, local_err); |
1605 | goto error; |
1606 | } |
1607 | |
1608 | /* Translate @host, @port, and @path to a SocketAddress */ |
1609 | if (!nbd_process_legacy_socket_options(options, opts, errp)) { |
1610 | goto error; |
1611 | } |
1612 | |
1613 | /* Pop the config into our state object. Exit if invalid. */ |
1614 | s->saddr = nbd_config(s, options, errp); |
1615 | if (!s->saddr) { |
1616 | goto error; |
1617 | } |
1618 | |
1619 | s->export = g_strdup(qemu_opt_get(opts, "export" )); |
1620 | |
1621 | s->tlscredsid = g_strdup(qemu_opt_get(opts, "tls-creds" )); |
1622 | if (s->tlscredsid) { |
1623 | s->tlscreds = nbd_get_tls_creds(s->tlscredsid, errp); |
1624 | if (!s->tlscreds) { |
1625 | goto error; |
1626 | } |
1627 | |
1628 | /* TODO SOCKET_ADDRESS_KIND_FD where fd has AF_INET or AF_INET6 */ |
1629 | if (s->saddr->type != SOCKET_ADDRESS_TYPE_INET) { |
1630 | error_setg(errp, "TLS only supported over IP sockets" ); |
1631 | goto error; |
1632 | } |
1633 | s->hostname = s->saddr->u.inet.host; |
1634 | } |
1635 | |
1636 | s->x_dirty_bitmap = g_strdup(qemu_opt_get(opts, "x-dirty-bitmap" )); |
1637 | s->reconnect_delay = qemu_opt_get_number(opts, "reconnect-delay" , 0); |
1638 | |
1639 | ret = 0; |
1640 | |
1641 | error: |
1642 | if (ret < 0) { |
1643 | object_unref(OBJECT(s->tlscreds)); |
1644 | qapi_free_SocketAddress(s->saddr); |
1645 | g_free(s->export); |
1646 | g_free(s->tlscredsid); |
1647 | } |
1648 | qemu_opts_del(opts); |
1649 | return ret; |
1650 | } |
1651 | |
1652 | static int nbd_open(BlockDriverState *bs, QDict *options, int flags, |
1653 | Error **errp) |
1654 | { |
1655 | int ret; |
1656 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
1657 | |
1658 | ret = nbd_process_options(bs, options, errp); |
1659 | if (ret < 0) { |
1660 | return ret; |
1661 | } |
1662 | |
1663 | s->bs = bs; |
1664 | qemu_co_mutex_init(&s->send_mutex); |
1665 | qemu_co_queue_init(&s->free_sema); |
1666 | |
1667 | ret = nbd_client_connect(bs, errp); |
1668 | if (ret < 0) { |
1669 | return ret; |
1670 | } |
1671 | /* successfully connected */ |
1672 | s->state = NBD_CLIENT_CONNECTED; |
1673 | |
1674 | s->connection_co = qemu_coroutine_create(nbd_connection_entry, s); |
1675 | bdrv_inc_in_flight(bs); |
1676 | aio_co_schedule(bdrv_get_aio_context(bs), s->connection_co); |
1677 | |
1678 | return 0; |
1679 | } |
1680 | |
1681 | static int nbd_co_flush(BlockDriverState *bs) |
1682 | { |
1683 | return nbd_client_co_flush(bs); |
1684 | } |
1685 | |
1686 | static void nbd_refresh_limits(BlockDriverState *bs, Error **errp) |
1687 | { |
1688 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
1689 | uint32_t min = s->info.min_block; |
1690 | uint32_t max = MIN_NON_ZERO(NBD_MAX_BUFFER_SIZE, s->info.max_block); |
1691 | |
1692 | /* |
1693 | * If the server did not advertise an alignment: |
1694 | * - a size that is not sector-aligned implies that an alignment |
1695 | * of 1 can be used to access those tail bytes |
1696 | * - advertisement of block status requires an alignment of 1, so |
1697 | * that we don't violate block layer constraints that block |
1698 | * status is always aligned (as we can't control whether the |
1699 | * server will report sub-sector extents, such as a hole at EOF |
1700 | * on an unaligned POSIX file) |
1701 | * - otherwise, assume the server is so old that we are safer avoiding |
1702 | * sub-sector requests |
1703 | */ |
1704 | if (!min) { |
1705 | min = (!QEMU_IS_ALIGNED(s->info.size, BDRV_SECTOR_SIZE) || |
1706 | s->info.base_allocation) ? 1 : BDRV_SECTOR_SIZE; |
1707 | } |
1708 | |
1709 | bs->bl.request_alignment = min; |
1710 | bs->bl.max_pdiscard = max; |
1711 | bs->bl.max_pwrite_zeroes = max; |
1712 | bs->bl.max_transfer = max; |
1713 | |
1714 | if (s->info.opt_block && |
1715 | s->info.opt_block > bs->bl.opt_transfer) { |
1716 | bs->bl.opt_transfer = s->info.opt_block; |
1717 | } |
1718 | } |
1719 | |
1720 | static void nbd_close(BlockDriverState *bs) |
1721 | { |
1722 | BDRVNBDState *s = bs->opaque; |
1723 | |
1724 | nbd_client_close(bs); |
1725 | |
1726 | object_unref(OBJECT(s->tlscreds)); |
1727 | qapi_free_SocketAddress(s->saddr); |
1728 | g_free(s->export); |
1729 | g_free(s->tlscredsid); |
1730 | g_free(s->x_dirty_bitmap); |
1731 | } |
1732 | |
1733 | static int64_t nbd_getlength(BlockDriverState *bs) |
1734 | { |
1735 | BDRVNBDState *s = bs->opaque; |
1736 | |
1737 | return s->info.size; |
1738 | } |
1739 | |
1740 | static void nbd_refresh_filename(BlockDriverState *bs) |
1741 | { |
1742 | BDRVNBDState *s = bs->opaque; |
1743 | const char *host = NULL, *port = NULL, *path = NULL; |
1744 | |
1745 | if (s->saddr->type == SOCKET_ADDRESS_TYPE_INET) { |
1746 | const InetSocketAddress *inet = &s->saddr->u.inet; |
1747 | if (!inet->has_ipv4 && !inet->has_ipv6 && !inet->has_to) { |
1748 | host = inet->host; |
1749 | port = inet->port; |
1750 | } |
1751 | } else if (s->saddr->type == SOCKET_ADDRESS_TYPE_UNIX) { |
1752 | path = s->saddr->u.q_unix.path; |
1753 | } /* else can't represent as pseudo-filename */ |
1754 | |
1755 | if (path && s->export) { |
1756 | snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
1757 | "nbd+unix:///%s?socket=%s" , s->export, path); |
1758 | } else if (path && !s->export) { |
1759 | snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
1760 | "nbd+unix://?socket=%s" , path); |
1761 | } else if (host && s->export) { |
1762 | snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
1763 | "nbd://%s:%s/%s" , host, port, s->export); |
1764 | } else if (host && !s->export) { |
1765 | snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
1766 | "nbd://%s:%s" , host, port); |
1767 | } |
1768 | } |
1769 | |
1770 | static char *nbd_dirname(BlockDriverState *bs, Error **errp) |
1771 | { |
1772 | /* The generic bdrv_dirname() implementation is able to work out some |
1773 | * directory name for NBD nodes, but that would be wrong. So far there is no |
1774 | * specification for how "export paths" would work, so NBD does not have |
1775 | * directory names. */ |
1776 | error_setg(errp, "Cannot generate a base directory for NBD nodes" ); |
1777 | return NULL; |
1778 | } |
1779 | |
1780 | static const char *const nbd_strong_runtime_opts[] = { |
1781 | "path" , |
1782 | "host" , |
1783 | "port" , |
1784 | "export" , |
1785 | "tls-creds" , |
1786 | "server." , |
1787 | |
1788 | NULL |
1789 | }; |
1790 | |
1791 | static BlockDriver bdrv_nbd = { |
1792 | .format_name = "nbd" , |
1793 | .protocol_name = "nbd" , |
1794 | .instance_size = sizeof(BDRVNBDState), |
1795 | .bdrv_parse_filename = nbd_parse_filename, |
1796 | .bdrv_file_open = nbd_open, |
1797 | .bdrv_co_preadv = nbd_client_co_preadv, |
1798 | .bdrv_co_pwritev = nbd_client_co_pwritev, |
1799 | .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
1800 | .bdrv_close = nbd_close, |
1801 | .bdrv_co_flush_to_os = nbd_co_flush, |
1802 | .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
1803 | .bdrv_refresh_limits = nbd_refresh_limits, |
1804 | .bdrv_getlength = nbd_getlength, |
1805 | .bdrv_detach_aio_context = nbd_client_detach_aio_context, |
1806 | .bdrv_attach_aio_context = nbd_client_attach_aio_context, |
1807 | .bdrv_refresh_filename = nbd_refresh_filename, |
1808 | .bdrv_co_block_status = nbd_client_co_block_status, |
1809 | .bdrv_dirname = nbd_dirname, |
1810 | .strong_runtime_opts = nbd_strong_runtime_opts, |
1811 | }; |
1812 | |
1813 | static BlockDriver bdrv_nbd_tcp = { |
1814 | .format_name = "nbd" , |
1815 | .protocol_name = "nbd+tcp" , |
1816 | .instance_size = sizeof(BDRVNBDState), |
1817 | .bdrv_parse_filename = nbd_parse_filename, |
1818 | .bdrv_file_open = nbd_open, |
1819 | .bdrv_co_preadv = nbd_client_co_preadv, |
1820 | .bdrv_co_pwritev = nbd_client_co_pwritev, |
1821 | .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
1822 | .bdrv_close = nbd_close, |
1823 | .bdrv_co_flush_to_os = nbd_co_flush, |
1824 | .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
1825 | .bdrv_refresh_limits = nbd_refresh_limits, |
1826 | .bdrv_getlength = nbd_getlength, |
1827 | .bdrv_detach_aio_context = nbd_client_detach_aio_context, |
1828 | .bdrv_attach_aio_context = nbd_client_attach_aio_context, |
1829 | .bdrv_refresh_filename = nbd_refresh_filename, |
1830 | .bdrv_co_block_status = nbd_client_co_block_status, |
1831 | .bdrv_dirname = nbd_dirname, |
1832 | .strong_runtime_opts = nbd_strong_runtime_opts, |
1833 | }; |
1834 | |
1835 | static BlockDriver bdrv_nbd_unix = { |
1836 | .format_name = "nbd" , |
1837 | .protocol_name = "nbd+unix" , |
1838 | .instance_size = sizeof(BDRVNBDState), |
1839 | .bdrv_parse_filename = nbd_parse_filename, |
1840 | .bdrv_file_open = nbd_open, |
1841 | .bdrv_co_preadv = nbd_client_co_preadv, |
1842 | .bdrv_co_pwritev = nbd_client_co_pwritev, |
1843 | .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
1844 | .bdrv_close = nbd_close, |
1845 | .bdrv_co_flush_to_os = nbd_co_flush, |
1846 | .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
1847 | .bdrv_refresh_limits = nbd_refresh_limits, |
1848 | .bdrv_getlength = nbd_getlength, |
1849 | .bdrv_detach_aio_context = nbd_client_detach_aio_context, |
1850 | .bdrv_attach_aio_context = nbd_client_attach_aio_context, |
1851 | .bdrv_refresh_filename = nbd_refresh_filename, |
1852 | .bdrv_co_block_status = nbd_client_co_block_status, |
1853 | .bdrv_dirname = nbd_dirname, |
1854 | .strong_runtime_opts = nbd_strong_runtime_opts, |
1855 | }; |
1856 | |
1857 | static void bdrv_nbd_init(void) |
1858 | { |
1859 | bdrv_register(&bdrv_nbd); |
1860 | bdrv_register(&bdrv_nbd_tcp); |
1861 | bdrv_register(&bdrv_nbd_unix); |
1862 | } |
1863 | |
1864 | block_init(bdrv_nbd_init); |
1865 | |