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Commit | Line | Data |
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75818250 | 1 | /* |
7a5ca864 FB |
2 | * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> |
3 | * | |
798bfe00 | 4 | * Network Block Device Server Side |
7a5ca864 FB |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; under version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
8167ee88 | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
75818250 | 17 | */ |
7a5ca864 | 18 | |
798bfe00 | 19 | #include "nbd-internal.h" |
ca441480 PB |
20 | |
21 | static int system_errno_to_nbd_errno(int err) | |
22 | { | |
23 | switch (err) { | |
24 | case 0: | |
25 | return NBD_SUCCESS; | |
26 | case EPERM: | |
27 | return NBD_EPERM; | |
28 | case EIO: | |
29 | return NBD_EIO; | |
30 | case ENOMEM: | |
31 | return NBD_ENOMEM; | |
32 | #ifdef EDQUOT | |
33 | case EDQUOT: | |
34 | #endif | |
35 | case EFBIG: | |
36 | case ENOSPC: | |
37 | return NBD_ENOSPC; | |
38 | case EINVAL: | |
39 | default: | |
40 | return NBD_EINVAL; | |
41 | } | |
42 | } | |
43 | ||
9a304d29 PB |
44 | /* Definitions for opaque data types */ |
45 | ||
46 | typedef struct NBDRequest NBDRequest; | |
47 | ||
48 | struct NBDRequest { | |
49 | QSIMPLEQ_ENTRY(NBDRequest) entry; | |
50 | NBDClient *client; | |
51 | uint8_t *data; | |
52 | }; | |
53 | ||
54 | struct NBDExport { | |
2c8d9f06 | 55 | int refcount; |
0ddf08db PB |
56 | void (*close)(NBDExport *exp); |
57 | ||
aadf99a7 | 58 | BlockBackend *blk; |
ee0a19ec | 59 | char *name; |
9a304d29 PB |
60 | off_t dev_offset; |
61 | off_t size; | |
62 | uint32_t nbdflags; | |
4b9441f6 | 63 | QTAILQ_HEAD(, NBDClient) clients; |
ee0a19ec | 64 | QTAILQ_ENTRY(NBDExport) next; |
958c717d HR |
65 | |
66 | AioContext *ctx; | |
9a304d29 PB |
67 | }; |
68 | ||
ee0a19ec PB |
69 | static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports); |
70 | ||
9a304d29 PB |
71 | struct NBDClient { |
72 | int refcount; | |
73 | void (*close)(NBDClient *client); | |
74 | ||
75 | NBDExport *exp; | |
76 | int sock; | |
77 | ||
78 | Coroutine *recv_coroutine; | |
79 | ||
80 | CoMutex send_lock; | |
81 | Coroutine *send_coroutine; | |
82 | ||
958c717d HR |
83 | bool can_read; |
84 | ||
4b9441f6 | 85 | QTAILQ_ENTRY(NBDClient) next; |
9a304d29 | 86 | int nb_requests; |
ff2b68aa | 87 | bool closing; |
9a304d29 PB |
88 | }; |
89 | ||
7a5ca864 FB |
90 | /* That's all folks */ |
91 | ||
958c717d HR |
92 | static void nbd_set_handlers(NBDClient *client); |
93 | static void nbd_unset_handlers(NBDClient *client); | |
94 | static void nbd_update_can_read(NBDClient *client); | |
95 | ||
1a6245a5 FZ |
96 | static void nbd_negotiate_continue(void *opaque) |
97 | { | |
98 | qemu_coroutine_enter(opaque, NULL); | |
99 | } | |
100 | ||
101 | static ssize_t nbd_negotiate_read(int fd, void *buffer, size_t size) | |
102 | { | |
103 | ssize_t ret; | |
104 | ||
105 | assert(qemu_in_coroutine()); | |
106 | /* Negotiation are always in main loop. */ | |
107 | qemu_set_fd_handler(fd, nbd_negotiate_continue, NULL, | |
108 | qemu_coroutine_self()); | |
109 | ret = read_sync(fd, buffer, size); | |
110 | qemu_set_fd_handler(fd, NULL, NULL, NULL); | |
111 | return ret; | |
112 | ||
113 | } | |
114 | ||
115 | static ssize_t nbd_negotiate_write(int fd, void *buffer, size_t size) | |
116 | { | |
117 | ssize_t ret; | |
118 | ||
119 | assert(qemu_in_coroutine()); | |
120 | /* Negotiation are always in main loop. */ | |
121 | qemu_set_fd_handler(fd, NULL, nbd_negotiate_continue, | |
122 | qemu_coroutine_self()); | |
123 | ret = write_sync(fd, buffer, size); | |
124 | qemu_set_fd_handler(fd, NULL, NULL, NULL); | |
125 | return ret; | |
126 | } | |
127 | ||
128 | static ssize_t nbd_negotiate_drop_sync(int fd, size_t size) | |
0379f474 HR |
129 | { |
130 | ssize_t ret, dropped = size; | |
131 | uint8_t *buffer = g_malloc(MIN(65536, size)); | |
132 | ||
133 | while (size > 0) { | |
1a6245a5 | 134 | ret = nbd_negotiate_read(fd, buffer, MIN(65536, size)); |
0379f474 HR |
135 | if (ret < 0) { |
136 | g_free(buffer); | |
137 | return ret; | |
138 | } | |
139 | ||
140 | assert(ret <= size); | |
141 | size -= ret; | |
142 | } | |
143 | ||
144 | g_free(buffer); | |
145 | return dropped; | |
146 | } | |
147 | ||
6b8c01e7 | 148 | /* Basic flow for negotiation |
7a5ca864 FB |
149 | |
150 | Server Client | |
7a5ca864 | 151 | Negotiate |
6b8c01e7 PB |
152 | |
153 | or | |
154 | ||
155 | Server Client | |
156 | Negotiate #1 | |
157 | Option | |
158 | Negotiate #2 | |
159 | ||
160 | ---- | |
161 | ||
162 | followed by | |
163 | ||
164 | Server Client | |
7a5ca864 FB |
165 | Request |
166 | Response | |
167 | Request | |
168 | Response | |
169 | ... | |
170 | ... | |
171 | Request (type == 2) | |
6b8c01e7 | 172 | |
7a5ca864 FB |
173 | */ |
174 | ||
1a6245a5 | 175 | static int nbd_negotiate_send_rep(int csock, uint32_t type, uint32_t opt) |
6b8c01e7 | 176 | { |
6b8c01e7 | 177 | uint64_t magic; |
f5076b5a | 178 | uint32_t len; |
6b8c01e7 | 179 | |
f5076b5a | 180 | magic = cpu_to_be64(NBD_REP_MAGIC); |
1a6245a5 | 181 | if (nbd_negotiate_write(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
f5076b5a HB |
182 | LOG("write failed (rep magic)"); |
183 | return -EINVAL; | |
6b8c01e7 | 184 | } |
f5076b5a | 185 | opt = cpu_to_be32(opt); |
1a6245a5 | 186 | if (nbd_negotiate_write(csock, &opt, sizeof(opt)) != sizeof(opt)) { |
f5076b5a HB |
187 | LOG("write failed (rep opt)"); |
188 | return -EINVAL; | |
6b8c01e7 | 189 | } |
f5076b5a | 190 | type = cpu_to_be32(type); |
1a6245a5 | 191 | if (nbd_negotiate_write(csock, &type, sizeof(type)) != sizeof(type)) { |
f5076b5a HB |
192 | LOG("write failed (rep type)"); |
193 | return -EINVAL; | |
6b8c01e7 | 194 | } |
f5076b5a | 195 | len = cpu_to_be32(0); |
1a6245a5 | 196 | if (nbd_negotiate_write(csock, &len, sizeof(len)) != sizeof(len)) { |
f5076b5a HB |
197 | LOG("write failed (rep data length)"); |
198 | return -EINVAL; | |
6b8c01e7 | 199 | } |
f5076b5a HB |
200 | return 0; |
201 | } | |
6b8c01e7 | 202 | |
1a6245a5 | 203 | static int nbd_negotiate_send_rep_list(int csock, NBDExport *exp) |
32d7d2e0 HB |
204 | { |
205 | uint64_t magic, name_len; | |
206 | uint32_t opt, type, len; | |
207 | ||
208 | name_len = strlen(exp->name); | |
209 | magic = cpu_to_be64(NBD_REP_MAGIC); | |
1a6245a5 | 210 | if (nbd_negotiate_write(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
32d7d2e0 HB |
211 | LOG("write failed (magic)"); |
212 | return -EINVAL; | |
213 | } | |
214 | opt = cpu_to_be32(NBD_OPT_LIST); | |
1a6245a5 | 215 | if (nbd_negotiate_write(csock, &opt, sizeof(opt)) != sizeof(opt)) { |
32d7d2e0 HB |
216 | LOG("write failed (opt)"); |
217 | return -EINVAL; | |
218 | } | |
219 | type = cpu_to_be32(NBD_REP_SERVER); | |
1a6245a5 | 220 | if (nbd_negotiate_write(csock, &type, sizeof(type)) != sizeof(type)) { |
32d7d2e0 HB |
221 | LOG("write failed (reply type)"); |
222 | return -EINVAL; | |
223 | } | |
224 | len = cpu_to_be32(name_len + sizeof(len)); | |
1a6245a5 | 225 | if (nbd_negotiate_write(csock, &len, sizeof(len)) != sizeof(len)) { |
32d7d2e0 HB |
226 | LOG("write failed (length)"); |
227 | return -EINVAL; | |
228 | } | |
229 | len = cpu_to_be32(name_len); | |
1a6245a5 | 230 | if (nbd_negotiate_write(csock, &len, sizeof(len)) != sizeof(len)) { |
32d7d2e0 HB |
231 | LOG("write failed (length)"); |
232 | return -EINVAL; | |
233 | } | |
1a6245a5 | 234 | if (nbd_negotiate_write(csock, exp->name, name_len) != name_len) { |
32d7d2e0 HB |
235 | LOG("write failed (buffer)"); |
236 | return -EINVAL; | |
237 | } | |
238 | return 0; | |
239 | } | |
240 | ||
1a6245a5 | 241 | static int nbd_negotiate_handle_list(NBDClient *client, uint32_t length) |
32d7d2e0 HB |
242 | { |
243 | int csock; | |
244 | NBDExport *exp; | |
245 | ||
246 | csock = client->sock; | |
247 | if (length) { | |
1a6245a5 | 248 | if (nbd_negotiate_drop_sync(csock, length) != length) { |
0379f474 HR |
249 | return -EIO; |
250 | } | |
1a6245a5 | 251 | return nbd_negotiate_send_rep(csock, NBD_REP_ERR_INVALID, NBD_OPT_LIST); |
32d7d2e0 HB |
252 | } |
253 | ||
254 | /* For each export, send a NBD_REP_SERVER reply. */ | |
255 | QTAILQ_FOREACH(exp, &exports, next) { | |
1a6245a5 | 256 | if (nbd_negotiate_send_rep_list(csock, exp)) { |
32d7d2e0 HB |
257 | return -EINVAL; |
258 | } | |
259 | } | |
260 | /* Finish with a NBD_REP_ACK. */ | |
1a6245a5 | 261 | return nbd_negotiate_send_rep(csock, NBD_REP_ACK, NBD_OPT_LIST); |
32d7d2e0 HB |
262 | } |
263 | ||
1a6245a5 | 264 | static int nbd_negotiate_handle_export_name(NBDClient *client, uint32_t length) |
f5076b5a HB |
265 | { |
266 | int rc = -EINVAL, csock = client->sock; | |
267 | char name[256]; | |
6b8c01e7 | 268 | |
f5076b5a HB |
269 | /* Client sends: |
270 | [20 .. xx] export name (length bytes) | |
271 | */ | |
6b8c01e7 | 272 | TRACE("Checking length"); |
6b8c01e7 PB |
273 | if (length > 255) { |
274 | LOG("Bad length received"); | |
275 | goto fail; | |
276 | } | |
1a6245a5 | 277 | if (nbd_negotiate_read(csock, name, length) != length) { |
6b8c01e7 PB |
278 | LOG("read failed"); |
279 | goto fail; | |
280 | } | |
281 | name[length] = '\0'; | |
282 | ||
283 | client->exp = nbd_export_find(name); | |
284 | if (!client->exp) { | |
285 | LOG("export not found"); | |
286 | goto fail; | |
287 | } | |
288 | ||
289 | QTAILQ_INSERT_TAIL(&client->exp->clients, client, next); | |
290 | nbd_export_get(client->exp); | |
6b8c01e7 PB |
291 | rc = 0; |
292 | fail: | |
293 | return rc; | |
294 | } | |
295 | ||
1a6245a5 | 296 | static int nbd_negotiate_options(NBDClient *client) |
f5076b5a | 297 | { |
9c122ada HR |
298 | int csock = client->sock; |
299 | uint32_t flags; | |
300 | ||
301 | /* Client sends: | |
302 | [ 0 .. 3] client flags | |
303 | ||
304 | [ 0 .. 7] NBD_OPTS_MAGIC | |
305 | [ 8 .. 11] NBD option | |
306 | [12 .. 15] Data length | |
307 | ... Rest of request | |
308 | ||
309 | [ 0 .. 7] NBD_OPTS_MAGIC | |
310 | [ 8 .. 11] Second NBD option | |
311 | [12 .. 15] Data length | |
312 | ... Rest of request | |
313 | */ | |
314 | ||
1a6245a5 | 315 | if (nbd_negotiate_read(csock, &flags, sizeof(flags)) != sizeof(flags)) { |
9c122ada HR |
316 | LOG("read failed"); |
317 | return -EIO; | |
318 | } | |
319 | TRACE("Checking client flags"); | |
320 | be32_to_cpus(&flags); | |
321 | if (flags != 0 && flags != NBD_FLAG_C_FIXED_NEWSTYLE) { | |
322 | LOG("Bad client flags received"); | |
323 | return -EIO; | |
324 | } | |
325 | ||
f5076b5a | 326 | while (1) { |
9c122ada | 327 | int ret; |
f5076b5a HB |
328 | uint32_t tmp, length; |
329 | uint64_t magic; | |
330 | ||
1a6245a5 | 331 | if (nbd_negotiate_read(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
f5076b5a HB |
332 | LOG("read failed"); |
333 | return -EINVAL; | |
334 | } | |
335 | TRACE("Checking opts magic"); | |
336 | if (magic != be64_to_cpu(NBD_OPTS_MAGIC)) { | |
337 | LOG("Bad magic received"); | |
338 | return -EINVAL; | |
339 | } | |
340 | ||
1a6245a5 | 341 | if (nbd_negotiate_read(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
f5076b5a HB |
342 | LOG("read failed"); |
343 | return -EINVAL; | |
344 | } | |
345 | ||
1a6245a5 FZ |
346 | if (nbd_negotiate_read(csock, &length, |
347 | sizeof(length)) != sizeof(length)) { | |
f5076b5a HB |
348 | LOG("read failed"); |
349 | return -EINVAL; | |
350 | } | |
351 | length = be32_to_cpu(length); | |
352 | ||
353 | TRACE("Checking option"); | |
354 | switch (be32_to_cpu(tmp)) { | |
32d7d2e0 | 355 | case NBD_OPT_LIST: |
1a6245a5 | 356 | ret = nbd_negotiate_handle_list(client, length); |
892f5a52 HR |
357 | if (ret < 0) { |
358 | return ret; | |
32d7d2e0 HB |
359 | } |
360 | break; | |
361 | ||
f5076b5a HB |
362 | case NBD_OPT_ABORT: |
363 | return -EINVAL; | |
364 | ||
365 | case NBD_OPT_EXPORT_NAME: | |
1a6245a5 | 366 | return nbd_negotiate_handle_export_name(client, length); |
f5076b5a HB |
367 | |
368 | default: | |
369 | tmp = be32_to_cpu(tmp); | |
370 | LOG("Unsupported option 0x%x", tmp); | |
1a6245a5 | 371 | nbd_negotiate_send_rep(client->sock, NBD_REP_ERR_UNSUP, tmp); |
f5076b5a HB |
372 | return -EINVAL; |
373 | } | |
374 | } | |
375 | } | |
376 | ||
1a6245a5 FZ |
377 | typedef struct { |
378 | NBDClient *client; | |
379 | Coroutine *co; | |
380 | } NBDClientNewData; | |
381 | ||
382 | static coroutine_fn int nbd_negotiate(NBDClientNewData *data) | |
7a5ca864 | 383 | { |
1a6245a5 | 384 | NBDClient *client = data->client; |
9a304d29 | 385 | int csock = client->sock; |
b2e3d87f | 386 | char buf[8 + 8 + 8 + 128]; |
185b4338 | 387 | int rc; |
6b8c01e7 PB |
388 | const int myflags = (NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_TRIM | |
389 | NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA); | |
b2e3d87f | 390 | |
6b8c01e7 PB |
391 | /* Negotiation header without options: |
392 | [ 0 .. 7] passwd ("NBDMAGIC") | |
393 | [ 8 .. 15] magic (NBD_CLIENT_MAGIC) | |
b2e3d87f | 394 | [16 .. 23] size |
6b8c01e7 | 395 | [24 .. 25] server flags (0) |
5672ee54 | 396 | [26 .. 27] export flags |
6b8c01e7 PB |
397 | [28 .. 151] reserved (0) |
398 | ||
399 | Negotiation header with options, part 1: | |
400 | [ 0 .. 7] passwd ("NBDMAGIC") | |
401 | [ 8 .. 15] magic (NBD_OPTS_MAGIC) | |
402 | [16 .. 17] server flags (0) | |
403 | ||
404 | part 2 (after options are sent): | |
405 | [18 .. 25] size | |
406 | [26 .. 27] export flags | |
407 | [28 .. 151] reserved (0) | |
b2e3d87f NT |
408 | */ |
409 | ||
185b4338 PB |
410 | rc = -EINVAL; |
411 | ||
b2e3d87f | 412 | TRACE("Beginning negotiation."); |
8ffaaba0 | 413 | memset(buf, 0, sizeof(buf)); |
b2e3d87f | 414 | memcpy(buf, "NBDMAGIC", 8); |
6b8c01e7 PB |
415 | if (client->exp) { |
416 | assert ((client->exp->nbdflags & ~65535) == 0); | |
417 | cpu_to_be64w((uint64_t*)(buf + 8), NBD_CLIENT_MAGIC); | |
418 | cpu_to_be64w((uint64_t*)(buf + 16), client->exp->size); | |
419 | cpu_to_be16w((uint16_t*)(buf + 26), client->exp->nbdflags | myflags); | |
420 | } else { | |
421 | cpu_to_be64w((uint64_t*)(buf + 8), NBD_OPTS_MAGIC); | |
f5076b5a | 422 | cpu_to_be16w((uint16_t *)(buf + 16), NBD_FLAG_FIXED_NEWSTYLE); |
6b8c01e7 | 423 | } |
b2e3d87f | 424 | |
6b8c01e7 | 425 | if (client->exp) { |
1a6245a5 | 426 | if (nbd_negotiate_write(csock, buf, sizeof(buf)) != sizeof(buf)) { |
6b8c01e7 PB |
427 | LOG("write failed"); |
428 | goto fail; | |
429 | } | |
430 | } else { | |
1a6245a5 | 431 | if (nbd_negotiate_write(csock, buf, 18) != 18) { |
6b8c01e7 PB |
432 | LOG("write failed"); |
433 | goto fail; | |
434 | } | |
1a6245a5 | 435 | rc = nbd_negotiate_options(client); |
f5076b5a | 436 | if (rc != 0) { |
6b8c01e7 PB |
437 | LOG("option negotiation failed"); |
438 | goto fail; | |
439 | } | |
440 | ||
441 | assert ((client->exp->nbdflags & ~65535) == 0); | |
442 | cpu_to_be64w((uint64_t*)(buf + 18), client->exp->size); | |
443 | cpu_to_be16w((uint16_t*)(buf + 26), client->exp->nbdflags | myflags); | |
1a6245a5 FZ |
444 | if (nbd_negotiate_write(csock, buf + 18, |
445 | sizeof(buf) - 18) != sizeof(buf) - 18) { | |
6b8c01e7 PB |
446 | LOG("write failed"); |
447 | goto fail; | |
448 | } | |
b2e3d87f NT |
449 | } |
450 | ||
07f35073 | 451 | TRACE("Negotiation succeeded."); |
185b4338 PB |
452 | rc = 0; |
453 | fail: | |
454 | return rc; | |
7a5ca864 FB |
455 | } |
456 | ||
b90fb4b8 | 457 | #ifdef __linux__ |
7a5ca864 FB |
458 | |
459 | int nbd_disconnect(int fd) | |
460 | { | |
b2e3d87f NT |
461 | ioctl(fd, NBD_CLEAR_QUE); |
462 | ioctl(fd, NBD_DISCONNECT); | |
463 | ioctl(fd, NBD_CLEAR_SOCK); | |
464 | return 0; | |
7a5ca864 FB |
465 | } |
466 | ||
03ff3ca3 | 467 | #else |
03ff3ca3 AL |
468 | |
469 | int nbd_disconnect(int fd) | |
470 | { | |
185b4338 | 471 | return -ENOTSUP; |
03ff3ca3 | 472 | } |
03ff3ca3 | 473 | #endif |
7a5ca864 | 474 | |
94e7340b | 475 | static ssize_t nbd_receive_request(int csock, struct nbd_request *request) |
75818250 | 476 | { |
fa26c26b | 477 | uint8_t buf[NBD_REQUEST_SIZE]; |
b2e3d87f | 478 | uint32_t magic; |
185b4338 | 479 | ssize_t ret; |
b2e3d87f | 480 | |
185b4338 PB |
481 | ret = read_sync(csock, buf, sizeof(buf)); |
482 | if (ret < 0) { | |
483 | return ret; | |
484 | } | |
485 | ||
486 | if (ret != sizeof(buf)) { | |
b2e3d87f | 487 | LOG("read failed"); |
185b4338 | 488 | return -EINVAL; |
b2e3d87f NT |
489 | } |
490 | ||
491 | /* Request | |
492 | [ 0 .. 3] magic (NBD_REQUEST_MAGIC) | |
493 | [ 4 .. 7] type (0 == READ, 1 == WRITE) | |
494 | [ 8 .. 15] handle | |
495 | [16 .. 23] from | |
496 | [24 .. 27] len | |
497 | */ | |
498 | ||
499 | magic = be32_to_cpup((uint32_t*)buf); | |
500 | request->type = be32_to_cpup((uint32_t*)(buf + 4)); | |
501 | request->handle = be64_to_cpup((uint64_t*)(buf + 8)); | |
502 | request->from = be64_to_cpup((uint64_t*)(buf + 16)); | |
503 | request->len = be32_to_cpup((uint32_t*)(buf + 24)); | |
504 | ||
505 | TRACE("Got request: " | |
506 | "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", | |
507 | magic, request->type, request->from, request->len); | |
508 | ||
509 | if (magic != NBD_REQUEST_MAGIC) { | |
510 | LOG("invalid magic (got 0x%x)", magic); | |
185b4338 | 511 | return -EINVAL; |
b2e3d87f NT |
512 | } |
513 | return 0; | |
75818250 TS |
514 | } |
515 | ||
94e7340b | 516 | static ssize_t nbd_send_reply(int csock, struct nbd_reply *reply) |
75818250 | 517 | { |
fa26c26b | 518 | uint8_t buf[NBD_REPLY_SIZE]; |
185b4338 | 519 | ssize_t ret; |
b2e3d87f | 520 | |
ca441480 PB |
521 | reply->error = system_errno_to_nbd_errno(reply->error); |
522 | ||
b2e3d87f NT |
523 | /* Reply |
524 | [ 0 .. 3] magic (NBD_REPLY_MAGIC) | |
525 | [ 4 .. 7] error (0 == no error) | |
526 | [ 7 .. 15] handle | |
527 | */ | |
528 | cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); | |
529 | cpu_to_be32w((uint32_t*)(buf + 4), reply->error); | |
530 | cpu_to_be64w((uint64_t*)(buf + 8), reply->handle); | |
531 | ||
532 | TRACE("Sending response to client"); | |
533 | ||
185b4338 PB |
534 | ret = write_sync(csock, buf, sizeof(buf)); |
535 | if (ret < 0) { | |
536 | return ret; | |
537 | } | |
538 | ||
539 | if (ret != sizeof(buf)) { | |
b2e3d87f | 540 | LOG("writing to socket failed"); |
185b4338 | 541 | return -EINVAL; |
b2e3d87f NT |
542 | } |
543 | return 0; | |
75818250 | 544 | } |
7a5ca864 | 545 | |
41996e38 PB |
546 | #define MAX_NBD_REQUESTS 16 |
547 | ||
ce33967a | 548 | void nbd_client_get(NBDClient *client) |
1743b515 PB |
549 | { |
550 | client->refcount++; | |
551 | } | |
552 | ||
ce33967a | 553 | void nbd_client_put(NBDClient *client) |
1743b515 PB |
554 | { |
555 | if (--client->refcount == 0) { | |
ff2b68aa | 556 | /* The last reference should be dropped by client->close, |
f53a829b | 557 | * which is called by client_close. |
ff2b68aa PB |
558 | */ |
559 | assert(client->closing); | |
560 | ||
958c717d | 561 | nbd_unset_handlers(client); |
ff2b68aa PB |
562 | close(client->sock); |
563 | client->sock = -1; | |
6b8c01e7 PB |
564 | if (client->exp) { |
565 | QTAILQ_REMOVE(&client->exp->clients, client, next); | |
566 | nbd_export_put(client->exp); | |
567 | } | |
1743b515 PB |
568 | g_free(client); |
569 | } | |
570 | } | |
571 | ||
f53a829b | 572 | static void client_close(NBDClient *client) |
1743b515 | 573 | { |
ff2b68aa PB |
574 | if (client->closing) { |
575 | return; | |
576 | } | |
577 | ||
578 | client->closing = true; | |
579 | ||
580 | /* Force requests to finish. They will drop their own references, | |
581 | * then we'll close the socket and free the NBDClient. | |
582 | */ | |
583 | shutdown(client->sock, 2); | |
584 | ||
585 | /* Also tell the client, so that they release their reference. */ | |
1743b515 PB |
586 | if (client->close) { |
587 | client->close(client); | |
588 | } | |
1743b515 PB |
589 | } |
590 | ||
72deddc5 | 591 | static NBDRequest *nbd_request_get(NBDClient *client) |
d9a73806 PB |
592 | { |
593 | NBDRequest *req; | |
72deddc5 | 594 | |
41996e38 PB |
595 | assert(client->nb_requests <= MAX_NBD_REQUESTS - 1); |
596 | client->nb_requests++; | |
958c717d | 597 | nbd_update_can_read(client); |
41996e38 | 598 | |
1729404c | 599 | req = g_new0(NBDRequest, 1); |
72deddc5 PB |
600 | nbd_client_get(client); |
601 | req->client = client; | |
d9a73806 PB |
602 | return req; |
603 | } | |
604 | ||
72deddc5 | 605 | static void nbd_request_put(NBDRequest *req) |
d9a73806 | 606 | { |
72deddc5 | 607 | NBDClient *client = req->client; |
e1adb27a | 608 | |
2d821488 SH |
609 | if (req->data) { |
610 | qemu_vfree(req->data); | |
611 | } | |
1729404c | 612 | g_free(req); |
e1adb27a | 613 | |
958c717d HR |
614 | client->nb_requests--; |
615 | nbd_update_can_read(client); | |
72deddc5 | 616 | nbd_client_put(client); |
d9a73806 PB |
617 | } |
618 | ||
aadf99a7 | 619 | static void blk_aio_attached(AioContext *ctx, void *opaque) |
f2149281 HR |
620 | { |
621 | NBDExport *exp = opaque; | |
622 | NBDClient *client; | |
623 | ||
624 | TRACE("Export %s: Attaching clients to AIO context %p\n", exp->name, ctx); | |
625 | ||
626 | exp->ctx = ctx; | |
627 | ||
628 | QTAILQ_FOREACH(client, &exp->clients, next) { | |
629 | nbd_set_handlers(client); | |
630 | } | |
631 | } | |
632 | ||
aadf99a7 | 633 | static void blk_aio_detach(void *opaque) |
f2149281 HR |
634 | { |
635 | NBDExport *exp = opaque; | |
636 | NBDClient *client; | |
637 | ||
638 | TRACE("Export %s: Detaching clients from AIO context %p\n", exp->name, exp->ctx); | |
639 | ||
640 | QTAILQ_FOREACH(client, &exp->clients, next) { | |
641 | nbd_unset_handlers(client); | |
642 | } | |
643 | ||
644 | exp->ctx = NULL; | |
645 | } | |
646 | ||
e140177d | 647 | NBDExport *nbd_export_new(BlockBackend *blk, off_t dev_offset, off_t size, |
98f44bbe HR |
648 | uint32_t nbdflags, void (*close)(NBDExport *), |
649 | Error **errp) | |
af49bbbe PB |
650 | { |
651 | NBDExport *exp = g_malloc0(sizeof(NBDExport)); | |
2c8d9f06 | 652 | exp->refcount = 1; |
4b9441f6 | 653 | QTAILQ_INIT(&exp->clients); |
aadf99a7 | 654 | exp->blk = blk; |
af49bbbe PB |
655 | exp->dev_offset = dev_offset; |
656 | exp->nbdflags = nbdflags; | |
98f44bbe HR |
657 | exp->size = size < 0 ? blk_getlength(blk) : size; |
658 | if (exp->size < 0) { | |
659 | error_setg_errno(errp, -exp->size, | |
660 | "Failed to determine the NBD export's length"); | |
661 | goto fail; | |
662 | } | |
663 | exp->size -= exp->size % BDRV_SECTOR_SIZE; | |
664 | ||
0ddf08db | 665 | exp->close = close; |
aadf99a7 HR |
666 | exp->ctx = blk_get_aio_context(blk); |
667 | blk_ref(blk); | |
668 | blk_add_aio_context_notifier(blk, blk_aio_attached, blk_aio_detach, exp); | |
7ea2d269 AK |
669 | /* |
670 | * NBD exports are used for non-shared storage migration. Make sure | |
671 | * that BDRV_O_INCOMING is cleared and the image is ready for write | |
672 | * access since the export could be available before migration handover. | |
673 | */ | |
e5f3e12e | 674 | aio_context_acquire(exp->ctx); |
aadf99a7 | 675 | blk_invalidate_cache(blk, NULL); |
e5f3e12e | 676 | aio_context_release(exp->ctx); |
af49bbbe | 677 | return exp; |
98f44bbe HR |
678 | |
679 | fail: | |
680 | g_free(exp); | |
681 | return NULL; | |
af49bbbe PB |
682 | } |
683 | ||
ee0a19ec PB |
684 | NBDExport *nbd_export_find(const char *name) |
685 | { | |
686 | NBDExport *exp; | |
687 | QTAILQ_FOREACH(exp, &exports, next) { | |
688 | if (strcmp(name, exp->name) == 0) { | |
689 | return exp; | |
690 | } | |
691 | } | |
692 | ||
693 | return NULL; | |
694 | } | |
695 | ||
696 | void nbd_export_set_name(NBDExport *exp, const char *name) | |
697 | { | |
698 | if (exp->name == name) { | |
699 | return; | |
700 | } | |
701 | ||
702 | nbd_export_get(exp); | |
703 | if (exp->name != NULL) { | |
704 | g_free(exp->name); | |
705 | exp->name = NULL; | |
706 | QTAILQ_REMOVE(&exports, exp, next); | |
707 | nbd_export_put(exp); | |
708 | } | |
709 | if (name != NULL) { | |
710 | nbd_export_get(exp); | |
711 | exp->name = g_strdup(name); | |
712 | QTAILQ_INSERT_TAIL(&exports, exp, next); | |
713 | } | |
714 | nbd_export_put(exp); | |
715 | } | |
716 | ||
af49bbbe PB |
717 | void nbd_export_close(NBDExport *exp) |
718 | { | |
4b9441f6 | 719 | NBDClient *client, *next; |
2c8d9f06 | 720 | |
4b9441f6 PB |
721 | nbd_export_get(exp); |
722 | QTAILQ_FOREACH_SAFE(client, &exp->clients, next, next) { | |
f53a829b | 723 | client_close(client); |
4b9441f6 | 724 | } |
125afda8 | 725 | nbd_export_set_name(exp, NULL); |
4b9441f6 | 726 | nbd_export_put(exp); |
2c8d9f06 PB |
727 | } |
728 | ||
729 | void nbd_export_get(NBDExport *exp) | |
730 | { | |
731 | assert(exp->refcount > 0); | |
732 | exp->refcount++; | |
733 | } | |
734 | ||
735 | void nbd_export_put(NBDExport *exp) | |
736 | { | |
737 | assert(exp->refcount > 0); | |
738 | if (exp->refcount == 1) { | |
739 | nbd_export_close(exp); | |
d9a73806 PB |
740 | } |
741 | ||
2c8d9f06 | 742 | if (--exp->refcount == 0) { |
ee0a19ec PB |
743 | assert(exp->name == NULL); |
744 | ||
0ddf08db PB |
745 | if (exp->close) { |
746 | exp->close(exp); | |
747 | } | |
748 | ||
d6268348 WC |
749 | if (exp->blk) { |
750 | blk_remove_aio_context_notifier(exp->blk, blk_aio_attached, | |
751 | blk_aio_detach, exp); | |
752 | blk_unref(exp->blk); | |
753 | exp->blk = NULL; | |
754 | } | |
755 | ||
2c8d9f06 PB |
756 | g_free(exp); |
757 | } | |
af49bbbe PB |
758 | } |
759 | ||
e140177d | 760 | BlockBackend *nbd_export_get_blockdev(NBDExport *exp) |
125afda8 | 761 | { |
aadf99a7 | 762 | return exp->blk; |
125afda8 PB |
763 | } |
764 | ||
ee0a19ec PB |
765 | void nbd_export_close_all(void) |
766 | { | |
767 | NBDExport *exp, *next; | |
768 | ||
769 | QTAILQ_FOREACH_SAFE(exp, &exports, next, next) { | |
770 | nbd_export_close(exp); | |
ee0a19ec PB |
771 | } |
772 | } | |
773 | ||
94e7340b PB |
774 | static ssize_t nbd_co_send_reply(NBDRequest *req, struct nbd_reply *reply, |
775 | int len) | |
22045592 | 776 | { |
72deddc5 PB |
777 | NBDClient *client = req->client; |
778 | int csock = client->sock; | |
94e7340b | 779 | ssize_t rc, ret; |
22045592 | 780 | |
262db388 | 781 | qemu_co_mutex_lock(&client->send_lock); |
262db388 | 782 | client->send_coroutine = qemu_coroutine_self(); |
958c717d | 783 | nbd_set_handlers(client); |
262db388 | 784 | |
22045592 PB |
785 | if (!len) { |
786 | rc = nbd_send_reply(csock, reply); | |
22045592 PB |
787 | } else { |
788 | socket_set_cork(csock, 1); | |
789 | rc = nbd_send_reply(csock, reply); | |
fc19f8a0 | 790 | if (rc >= 0) { |
262db388 | 791 | ret = qemu_co_send(csock, req->data, len); |
22045592 | 792 | if (ret != len) { |
185b4338 | 793 | rc = -EIO; |
22045592 PB |
794 | } |
795 | } | |
22045592 PB |
796 | socket_set_cork(csock, 0); |
797 | } | |
262db388 PB |
798 | |
799 | client->send_coroutine = NULL; | |
958c717d | 800 | nbd_set_handlers(client); |
262db388 | 801 | qemu_co_mutex_unlock(&client->send_lock); |
22045592 PB |
802 | return rc; |
803 | } | |
804 | ||
94e7340b | 805 | static ssize_t nbd_co_receive_request(NBDRequest *req, struct nbd_request *request) |
a030b347 | 806 | { |
72deddc5 PB |
807 | NBDClient *client = req->client; |
808 | int csock = client->sock; | |
2d821488 | 809 | uint32_t command; |
94e7340b | 810 | ssize_t rc; |
a030b347 | 811 | |
262db388 | 812 | client->recv_coroutine = qemu_coroutine_self(); |
958c717d HR |
813 | nbd_update_can_read(client); |
814 | ||
7fe7b68b PB |
815 | rc = nbd_receive_request(csock, request); |
816 | if (rc < 0) { | |
817 | if (rc != -EAGAIN) { | |
818 | rc = -EIO; | |
819 | } | |
a030b347 PB |
820 | goto out; |
821 | } | |
822 | ||
a030b347 PB |
823 | if ((request->from + request->len) < request->from) { |
824 | LOG("integer overflow detected! " | |
825 | "you're probably being attacked"); | |
826 | rc = -EINVAL; | |
827 | goto out; | |
828 | } | |
829 | ||
830 | TRACE("Decoding type"); | |
831 | ||
2d821488 SH |
832 | command = request->type & NBD_CMD_MASK_COMMAND; |
833 | if (command == NBD_CMD_READ || command == NBD_CMD_WRITE) { | |
eb38c3b6 PB |
834 | if (request->len > NBD_MAX_BUFFER_SIZE) { |
835 | LOG("len (%u) is larger than max len (%u)", | |
836 | request->len, NBD_MAX_BUFFER_SIZE); | |
837 | rc = -EINVAL; | |
838 | goto out; | |
839 | } | |
840 | ||
f1c17521 PB |
841 | req->data = blk_try_blockalign(client->exp->blk, request->len); |
842 | if (req->data == NULL) { | |
843 | rc = -ENOMEM; | |
844 | goto out; | |
845 | } | |
2d821488 SH |
846 | } |
847 | if (command == NBD_CMD_WRITE) { | |
a030b347 PB |
848 | TRACE("Reading %u byte(s)", request->len); |
849 | ||
262db388 | 850 | if (qemu_co_recv(csock, req->data, request->len) != request->len) { |
a030b347 PB |
851 | LOG("reading from socket failed"); |
852 | rc = -EIO; | |
853 | goto out; | |
854 | } | |
855 | } | |
856 | rc = 0; | |
857 | ||
858 | out: | |
262db388 | 859 | client->recv_coroutine = NULL; |
958c717d HR |
860 | nbd_update_can_read(client); |
861 | ||
a030b347 PB |
862 | return rc; |
863 | } | |
864 | ||
262db388 | 865 | static void nbd_trip(void *opaque) |
75818250 | 866 | { |
262db388 | 867 | NBDClient *client = opaque; |
1743b515 | 868 | NBDExport *exp = client->exp; |
ff2b68aa | 869 | NBDRequest *req; |
b2e3d87f NT |
870 | struct nbd_request request; |
871 | struct nbd_reply reply; | |
94e7340b | 872 | ssize_t ret; |
8c5d1abb | 873 | uint32_t command; |
b2e3d87f NT |
874 | |
875 | TRACE("Reading request."); | |
ff2b68aa PB |
876 | if (client->closing) { |
877 | return; | |
878 | } | |
b2e3d87f | 879 | |
ff2b68aa | 880 | req = nbd_request_get(client); |
262db388 | 881 | ret = nbd_co_receive_request(req, &request); |
7fe7b68b PB |
882 | if (ret == -EAGAIN) { |
883 | goto done; | |
884 | } | |
a030b347 | 885 | if (ret == -EIO) { |
d9a73806 | 886 | goto out; |
a030b347 | 887 | } |
b2e3d87f | 888 | |
fae69416 PB |
889 | reply.handle = request.handle; |
890 | reply.error = 0; | |
891 | ||
a030b347 PB |
892 | if (ret < 0) { |
893 | reply.error = -ret; | |
894 | goto error_reply; | |
b2e3d87f | 895 | } |
8c5d1abb HB |
896 | command = request.type & NBD_CMD_MASK_COMMAND; |
897 | if (command != NBD_CMD_DISC && (request.from + request.len) > exp->size) { | |
b2e3d87f NT |
898 | LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
899 | ", Offset: %" PRIu64 "\n", | |
af49bbbe | 900 | request.from, request.len, |
0fee8f34 | 901 | (uint64_t)exp->size, (uint64_t)exp->dev_offset); |
b2e3d87f | 902 | LOG("requested operation past EOF--bad client?"); |
fae69416 | 903 | goto invalid_request; |
b2e3d87f NT |
904 | } |
905 | ||
d6268348 WC |
906 | if (client->closing) { |
907 | /* | |
908 | * The client may be closed when we are blocked in | |
909 | * nbd_co_receive_request() | |
910 | */ | |
911 | goto done; | |
912 | } | |
913 | ||
8c5d1abb | 914 | switch (command) { |
b2e3d87f NT |
915 | case NBD_CMD_READ: |
916 | TRACE("Request type is READ"); | |
917 | ||
e25ceb76 | 918 | if (request.type & NBD_CMD_FLAG_FUA) { |
aadf99a7 | 919 | ret = blk_co_flush(exp->blk); |
e25ceb76 PB |
920 | if (ret < 0) { |
921 | LOG("flush failed"); | |
922 | reply.error = -ret; | |
923 | goto error_reply; | |
924 | } | |
925 | } | |
926 | ||
aadf99a7 HR |
927 | ret = blk_read(exp->blk, |
928 | (request.from + exp->dev_offset) / BDRV_SECTOR_SIZE, | |
929 | req->data, request.len / BDRV_SECTOR_SIZE); | |
adcf6302 | 930 | if (ret < 0) { |
b2e3d87f | 931 | LOG("reading from file failed"); |
adcf6302 | 932 | reply.error = -ret; |
fae69416 | 933 | goto error_reply; |
b2e3d87f | 934 | } |
b2e3d87f NT |
935 | |
936 | TRACE("Read %u byte(s)", request.len); | |
262db388 | 937 | if (nbd_co_send_reply(req, &reply, request.len) < 0) |
d9a73806 | 938 | goto out; |
b2e3d87f NT |
939 | break; |
940 | case NBD_CMD_WRITE: | |
941 | TRACE("Request type is WRITE"); | |
942 | ||
af49bbbe | 943 | if (exp->nbdflags & NBD_FLAG_READ_ONLY) { |
b2e3d87f | 944 | TRACE("Server is read-only, return error"); |
fae69416 PB |
945 | reply.error = EROFS; |
946 | goto error_reply; | |
947 | } | |
948 | ||
949 | TRACE("Writing to device"); | |
950 | ||
aadf99a7 HR |
951 | ret = blk_write(exp->blk, |
952 | (request.from + exp->dev_offset) / BDRV_SECTOR_SIZE, | |
953 | req->data, request.len / BDRV_SECTOR_SIZE); | |
fae69416 PB |
954 | if (ret < 0) { |
955 | LOG("writing to file failed"); | |
956 | reply.error = -ret; | |
957 | goto error_reply; | |
958 | } | |
b2e3d87f | 959 | |
fae69416 | 960 | if (request.type & NBD_CMD_FLAG_FUA) { |
aadf99a7 | 961 | ret = blk_co_flush(exp->blk); |
adcf6302 | 962 | if (ret < 0) { |
fae69416 | 963 | LOG("flush failed"); |
adcf6302 | 964 | reply.error = -ret; |
fae69416 | 965 | goto error_reply; |
2c7989a9 | 966 | } |
b2e3d87f NT |
967 | } |
968 | ||
fc19f8a0 | 969 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
d9a73806 | 970 | goto out; |
fc19f8a0 | 971 | } |
b2e3d87f NT |
972 | break; |
973 | case NBD_CMD_DISC: | |
974 | TRACE("Request type is DISCONNECT"); | |
975 | errno = 0; | |
262db388 | 976 | goto out; |
1486d04a PB |
977 | case NBD_CMD_FLUSH: |
978 | TRACE("Request type is FLUSH"); | |
979 | ||
aadf99a7 | 980 | ret = blk_co_flush(exp->blk); |
1486d04a PB |
981 | if (ret < 0) { |
982 | LOG("flush failed"); | |
983 | reply.error = -ret; | |
984 | } | |
fc19f8a0 | 985 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
d9a73806 | 986 | goto out; |
fc19f8a0 | 987 | } |
7a706633 PB |
988 | break; |
989 | case NBD_CMD_TRIM: | |
990 | TRACE("Request type is TRIM"); | |
aadf99a7 HR |
991 | ret = blk_co_discard(exp->blk, (request.from + exp->dev_offset) |
992 | / BDRV_SECTOR_SIZE, | |
993 | request.len / BDRV_SECTOR_SIZE); | |
7a706633 PB |
994 | if (ret < 0) { |
995 | LOG("discard failed"); | |
996 | reply.error = -ret; | |
997 | } | |
fc19f8a0 | 998 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
d9a73806 | 999 | goto out; |
fc19f8a0 | 1000 | } |
1486d04a | 1001 | break; |
b2e3d87f NT |
1002 | default: |
1003 | LOG("invalid request type (%u) received", request.type); | |
fae69416 | 1004 | invalid_request: |
8b2f0abf | 1005 | reply.error = EINVAL; |
fae69416 | 1006 | error_reply: |
fc19f8a0 | 1007 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
d9a73806 | 1008 | goto out; |
fc19f8a0 | 1009 | } |
fae69416 | 1010 | break; |
b2e3d87f NT |
1011 | } |
1012 | ||
1013 | TRACE("Request/Reply complete"); | |
1014 | ||
7fe7b68b | 1015 | done: |
262db388 PB |
1016 | nbd_request_put(req); |
1017 | return; | |
1018 | ||
d9a73806 | 1019 | out: |
72deddc5 | 1020 | nbd_request_put(req); |
f53a829b | 1021 | client_close(client); |
7a5ca864 | 1022 | } |
af49bbbe | 1023 | |
1743b515 PB |
1024 | static void nbd_read(void *opaque) |
1025 | { | |
1026 | NBDClient *client = opaque; | |
1027 | ||
262db388 PB |
1028 | if (client->recv_coroutine) { |
1029 | qemu_coroutine_enter(client->recv_coroutine, NULL); | |
1030 | } else { | |
1031 | qemu_coroutine_enter(qemu_coroutine_create(nbd_trip), client); | |
1743b515 | 1032 | } |
1743b515 PB |
1033 | } |
1034 | ||
262db388 PB |
1035 | static void nbd_restart_write(void *opaque) |
1036 | { | |
1037 | NBDClient *client = opaque; | |
1038 | ||
1039 | qemu_coroutine_enter(client->send_coroutine, NULL); | |
1040 | } | |
1041 | ||
958c717d HR |
1042 | static void nbd_set_handlers(NBDClient *client) |
1043 | { | |
1044 | if (client->exp && client->exp->ctx) { | |
1045 | aio_set_fd_handler(client->exp->ctx, client->sock, | |
172cc129 | 1046 | true, |
958c717d HR |
1047 | client->can_read ? nbd_read : NULL, |
1048 | client->send_coroutine ? nbd_restart_write : NULL, | |
1049 | client); | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | static void nbd_unset_handlers(NBDClient *client) | |
1054 | { | |
1055 | if (client->exp && client->exp->ctx) { | |
dca21ef2 | 1056 | aio_set_fd_handler(client->exp->ctx, client->sock, |
172cc129 | 1057 | true, NULL, NULL, NULL); |
958c717d HR |
1058 | } |
1059 | } | |
1060 | ||
1061 | static void nbd_update_can_read(NBDClient *client) | |
1062 | { | |
1063 | bool can_read = client->recv_coroutine || | |
1064 | client->nb_requests < MAX_NBD_REQUESTS; | |
1065 | ||
1066 | if (can_read != client->can_read) { | |
1067 | client->can_read = can_read; | |
1068 | nbd_set_handlers(client); | |
1069 | ||
1070 | /* There is no need to invoke aio_notify(), since aio_set_fd_handler() | |
1071 | * in nbd_set_handlers() will have taken care of that */ | |
1072 | } | |
1073 | } | |
1074 | ||
1a6245a5 FZ |
1075 | static coroutine_fn void nbd_co_client_start(void *opaque) |
1076 | { | |
1077 | NBDClientNewData *data = opaque; | |
1078 | NBDClient *client = data->client; | |
1079 | NBDExport *exp = client->exp; | |
1080 | ||
1081 | if (exp) { | |
1082 | nbd_export_get(exp); | |
1083 | } | |
1084 | if (nbd_negotiate(data)) { | |
1085 | shutdown(client->sock, 2); | |
1086 | client->close(client); | |
1087 | goto out; | |
1088 | } | |
1089 | qemu_co_mutex_init(&client->send_lock); | |
1090 | nbd_set_handlers(client); | |
1091 | ||
1092 | if (exp) { | |
1093 | QTAILQ_INSERT_TAIL(&exp->clients, client, next); | |
1094 | } | |
1095 | out: | |
1096 | g_free(data); | |
1097 | } | |
1098 | ||
ee7d7aab | 1099 | void nbd_client_new(NBDExport *exp, int csock, void (*close_fn)(NBDClient *)) |
af49bbbe | 1100 | { |
1743b515 | 1101 | NBDClient *client; |
1a6245a5 FZ |
1102 | NBDClientNewData *data = g_new(NBDClientNewData, 1); |
1103 | ||
1743b515 PB |
1104 | client = g_malloc0(sizeof(NBDClient)); |
1105 | client->refcount = 1; | |
1106 | client->exp = exp; | |
1107 | client->sock = csock; | |
958c717d | 1108 | client->can_read = true; |
ee7d7aab | 1109 | client->close = close_fn; |
2c8d9f06 | 1110 | |
1a6245a5 FZ |
1111 | data->client = client; |
1112 | data->co = qemu_coroutine_create(nbd_co_client_start); | |
1113 | qemu_coroutine_enter(data->co, data); | |
af49bbbe | 1114 | } |