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1 | /* | |
2 | * QEMU Block driver for CURL images | |
3 | * | |
4 | * Copyright (c) 2009 Alexander Graf <agraf@suse.de> | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include "qemu-common.h" | |
25 | #include "block/block_int.h" | |
26 | #include <curl/curl.h> | |
27 | ||
28 | // #define DEBUG | |
29 | // #define DEBUG_VERBOSE | |
30 | ||
31 | #ifdef DEBUG_CURL | |
32 | #define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0) | |
33 | #else | |
34 | #define DPRINTF(fmt, ...) do { } while (0) | |
35 | #endif | |
36 | ||
37 | #define CURL_NUM_STATES 8 | |
38 | #define CURL_NUM_ACB 8 | |
39 | #define SECTOR_SIZE 512 | |
40 | #define READ_AHEAD_SIZE (256 * 1024) | |
41 | ||
42 | #define FIND_RET_NONE 0 | |
43 | #define FIND_RET_OK 1 | |
44 | #define FIND_RET_WAIT 2 | |
45 | ||
46 | struct BDRVCURLState; | |
47 | ||
48 | typedef struct CURLAIOCB { | |
49 | BlockDriverAIOCB common; | |
50 | QEMUBH *bh; | |
51 | QEMUIOVector *qiov; | |
52 | ||
53 | int64_t sector_num; | |
54 | int nb_sectors; | |
55 | ||
56 | size_t start; | |
57 | size_t end; | |
58 | } CURLAIOCB; | |
59 | ||
60 | typedef struct CURLState | |
61 | { | |
62 | struct BDRVCURLState *s; | |
63 | CURLAIOCB *acb[CURL_NUM_ACB]; | |
64 | CURL *curl; | |
65 | char *orig_buf; | |
66 | size_t buf_start; | |
67 | size_t buf_off; | |
68 | size_t buf_len; | |
69 | char range[128]; | |
70 | char errmsg[CURL_ERROR_SIZE]; | |
71 | char in_use; | |
72 | } CURLState; | |
73 | ||
74 | typedef struct BDRVCURLState { | |
75 | CURLM *multi; | |
76 | size_t len; | |
77 | CURLState states[CURL_NUM_STATES]; | |
78 | char *url; | |
79 | size_t readahead_size; | |
80 | } BDRVCURLState; | |
81 | ||
82 | static void curl_clean_state(CURLState *s); | |
83 | static void curl_multi_do(void *arg); | |
84 | static int curl_aio_flush(void *opaque); | |
85 | ||
86 | static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action, | |
87 | void *s, void *sp) | |
88 | { | |
89 | DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd); | |
90 | switch (action) { | |
91 | case CURL_POLL_IN: | |
92 | qemu_aio_set_fd_handler(fd, curl_multi_do, NULL, curl_aio_flush, s); | |
93 | break; | |
94 | case CURL_POLL_OUT: | |
95 | qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, curl_aio_flush, s); | |
96 | break; | |
97 | case CURL_POLL_INOUT: | |
98 | qemu_aio_set_fd_handler(fd, curl_multi_do, curl_multi_do, | |
99 | curl_aio_flush, s); | |
100 | break; | |
101 | case CURL_POLL_REMOVE: | |
102 | qemu_aio_set_fd_handler(fd, NULL, NULL, NULL, NULL); | |
103 | break; | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static size_t curl_size_cb(void *ptr, size_t size, size_t nmemb, void *opaque) | |
110 | { | |
111 | CURLState *s = ((CURLState*)opaque); | |
112 | size_t realsize = size * nmemb; | |
113 | size_t fsize; | |
114 | ||
115 | if(sscanf(ptr, "Content-Length: %zd", &fsize) == 1) { | |
116 | s->s->len = fsize; | |
117 | } | |
118 | ||
119 | return realsize; | |
120 | } | |
121 | ||
122 | static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque) | |
123 | { | |
124 | CURLState *s = ((CURLState*)opaque); | |
125 | size_t realsize = size * nmemb; | |
126 | int i; | |
127 | ||
128 | DPRINTF("CURL: Just reading %zd bytes\n", realsize); | |
129 | ||
130 | if (!s || !s->orig_buf) | |
131 | goto read_end; | |
132 | ||
133 | memcpy(s->orig_buf + s->buf_off, ptr, realsize); | |
134 | s->buf_off += realsize; | |
135 | ||
136 | for(i=0; i<CURL_NUM_ACB; i++) { | |
137 | CURLAIOCB *acb = s->acb[i]; | |
138 | ||
139 | if (!acb) | |
140 | continue; | |
141 | ||
142 | if ((s->buf_off >= acb->end)) { | |
143 | qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start, | |
144 | acb->end - acb->start); | |
145 | acb->common.cb(acb->common.opaque, 0); | |
146 | qemu_aio_release(acb); | |
147 | s->acb[i] = NULL; | |
148 | } | |
149 | } | |
150 | ||
151 | read_end: | |
152 | return realsize; | |
153 | } | |
154 | ||
155 | static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len, | |
156 | CURLAIOCB *acb) | |
157 | { | |
158 | int i; | |
159 | size_t end = start + len; | |
160 | ||
161 | for (i=0; i<CURL_NUM_STATES; i++) { | |
162 | CURLState *state = &s->states[i]; | |
163 | size_t buf_end = (state->buf_start + state->buf_off); | |
164 | size_t buf_fend = (state->buf_start + state->buf_len); | |
165 | ||
166 | if (!state->orig_buf) | |
167 | continue; | |
168 | if (!state->buf_off) | |
169 | continue; | |
170 | ||
171 | // Does the existing buffer cover our section? | |
172 | if ((start >= state->buf_start) && | |
173 | (start <= buf_end) && | |
174 | (end >= state->buf_start) && | |
175 | (end <= buf_end)) | |
176 | { | |
177 | char *buf = state->orig_buf + (start - state->buf_start); | |
178 | ||
179 | qemu_iovec_from_buf(acb->qiov, 0, buf, len); | |
180 | acb->common.cb(acb->common.opaque, 0); | |
181 | ||
182 | return FIND_RET_OK; | |
183 | } | |
184 | ||
185 | // Wait for unfinished chunks | |
186 | if ((start >= state->buf_start) && | |
187 | (start <= buf_fend) && | |
188 | (end >= state->buf_start) && | |
189 | (end <= buf_fend)) | |
190 | { | |
191 | int j; | |
192 | ||
193 | acb->start = start - state->buf_start; | |
194 | acb->end = acb->start + len; | |
195 | ||
196 | for (j=0; j<CURL_NUM_ACB; j++) { | |
197 | if (!state->acb[j]) { | |
198 | state->acb[j] = acb; | |
199 | return FIND_RET_WAIT; | |
200 | } | |
201 | } | |
202 | } | |
203 | } | |
204 | ||
205 | return FIND_RET_NONE; | |
206 | } | |
207 | ||
208 | static void curl_multi_do(void *arg) | |
209 | { | |
210 | BDRVCURLState *s = (BDRVCURLState *)arg; | |
211 | int running; | |
212 | int r; | |
213 | int msgs_in_queue; | |
214 | ||
215 | if (!s->multi) | |
216 | return; | |
217 | ||
218 | do { | |
219 | r = curl_multi_socket_all(s->multi, &running); | |
220 | } while(r == CURLM_CALL_MULTI_PERFORM); | |
221 | ||
222 | /* Try to find done transfers, so we can free the easy | |
223 | * handle again. */ | |
224 | do { | |
225 | CURLMsg *msg; | |
226 | msg = curl_multi_info_read(s->multi, &msgs_in_queue); | |
227 | ||
228 | if (!msg) | |
229 | break; | |
230 | if (msg->msg == CURLMSG_NONE) | |
231 | break; | |
232 | ||
233 | switch (msg->msg) { | |
234 | case CURLMSG_DONE: | |
235 | { | |
236 | CURLState *state = NULL; | |
237 | curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, (char**)&state); | |
238 | ||
239 | /* ACBs for successful messages get completed in curl_read_cb */ | |
240 | if (msg->data.result != CURLE_OK) { | |
241 | int i; | |
242 | for (i = 0; i < CURL_NUM_ACB; i++) { | |
243 | CURLAIOCB *acb = state->acb[i]; | |
244 | ||
245 | if (acb == NULL) { | |
246 | continue; | |
247 | } | |
248 | ||
249 | acb->common.cb(acb->common.opaque, -EIO); | |
250 | qemu_aio_release(acb); | |
251 | state->acb[i] = NULL; | |
252 | } | |
253 | } | |
254 | ||
255 | curl_clean_state(state); | |
256 | break; | |
257 | } | |
258 | default: | |
259 | msgs_in_queue = 0; | |
260 | break; | |
261 | } | |
262 | } while(msgs_in_queue); | |
263 | } | |
264 | ||
265 | static CURLState *curl_init_state(BDRVCURLState *s) | |
266 | { | |
267 | CURLState *state = NULL; | |
268 | int i, j; | |
269 | ||
270 | do { | |
271 | for (i=0; i<CURL_NUM_STATES; i++) { | |
272 | for (j=0; j<CURL_NUM_ACB; j++) | |
273 | if (s->states[i].acb[j]) | |
274 | continue; | |
275 | if (s->states[i].in_use) | |
276 | continue; | |
277 | ||
278 | state = &s->states[i]; | |
279 | state->in_use = 1; | |
280 | break; | |
281 | } | |
282 | if (!state) { | |
283 | g_usleep(100); | |
284 | curl_multi_do(s); | |
285 | } | |
286 | } while(!state); | |
287 | ||
288 | if (state->curl) | |
289 | goto has_curl; | |
290 | ||
291 | state->curl = curl_easy_init(); | |
292 | if (!state->curl) | |
293 | return NULL; | |
294 | curl_easy_setopt(state->curl, CURLOPT_URL, s->url); | |
295 | curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, 5); | |
296 | curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_read_cb); | |
297 | curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state); | |
298 | curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state); | |
299 | curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1); | |
300 | curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1); | |
301 | curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1); | |
302 | curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg); | |
303 | curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1); | |
304 | ||
305 | #ifdef DEBUG_VERBOSE | |
306 | curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1); | |
307 | #endif | |
308 | ||
309 | has_curl: | |
310 | ||
311 | state->s = s; | |
312 | ||
313 | return state; | |
314 | } | |
315 | ||
316 | static void curl_clean_state(CURLState *s) | |
317 | { | |
318 | if (s->s->multi) | |
319 | curl_multi_remove_handle(s->s->multi, s->curl); | |
320 | s->in_use = 0; | |
321 | } | |
322 | ||
323 | static int curl_open(BlockDriverState *bs, const char *filename, int flags) | |
324 | { | |
325 | BDRVCURLState *s = bs->opaque; | |
326 | CURLState *state = NULL; | |
327 | double d; | |
328 | ||
329 | #define RA_OPTSTR ":readahead=" | |
330 | char *file; | |
331 | char *ra; | |
332 | const char *ra_val; | |
333 | int parse_state = 0; | |
334 | ||
335 | static int inited = 0; | |
336 | ||
337 | file = g_strdup(filename); | |
338 | s->readahead_size = READ_AHEAD_SIZE; | |
339 | ||
340 | /* Parse a trailing ":readahead=#:" param, if present. */ | |
341 | ra = file + strlen(file) - 1; | |
342 | while (ra >= file) { | |
343 | if (parse_state == 0) { | |
344 | if (*ra == ':') | |
345 | parse_state++; | |
346 | else | |
347 | break; | |
348 | } else if (parse_state == 1) { | |
349 | if (*ra > '9' || *ra < '0') { | |
350 | char *opt_start = ra - strlen(RA_OPTSTR) + 1; | |
351 | if (opt_start > file && | |
352 | strncmp(opt_start, RA_OPTSTR, strlen(RA_OPTSTR)) == 0) { | |
353 | ra_val = ra + 1; | |
354 | ra -= strlen(RA_OPTSTR) - 1; | |
355 | *ra = '\0'; | |
356 | s->readahead_size = atoi(ra_val); | |
357 | break; | |
358 | } else { | |
359 | break; | |
360 | } | |
361 | } | |
362 | } | |
363 | ra--; | |
364 | } | |
365 | ||
366 | if ((s->readahead_size & 0x1ff) != 0) { | |
367 | fprintf(stderr, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512\n", | |
368 | s->readahead_size); | |
369 | goto out_noclean; | |
370 | } | |
371 | ||
372 | if (!inited) { | |
373 | curl_global_init(CURL_GLOBAL_ALL); | |
374 | inited = 1; | |
375 | } | |
376 | ||
377 | DPRINTF("CURL: Opening %s\n", file); | |
378 | s->url = file; | |
379 | state = curl_init_state(s); | |
380 | if (!state) | |
381 | goto out_noclean; | |
382 | ||
383 | // Get file size | |
384 | ||
385 | curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1); | |
386 | curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_size_cb); | |
387 | if (curl_easy_perform(state->curl)) | |
388 | goto out; | |
389 | curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d); | |
390 | curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_read_cb); | |
391 | curl_easy_setopt(state->curl, CURLOPT_NOBODY, 0); | |
392 | if (d) | |
393 | s->len = (size_t)d; | |
394 | else if(!s->len) | |
395 | goto out; | |
396 | DPRINTF("CURL: Size = %zd\n", s->len); | |
397 | ||
398 | curl_clean_state(state); | |
399 | curl_easy_cleanup(state->curl); | |
400 | state->curl = NULL; | |
401 | ||
402 | // Now we know the file exists and its size, so let's | |
403 | // initialize the multi interface! | |
404 | ||
405 | s->multi = curl_multi_init(); | |
406 | curl_multi_setopt( s->multi, CURLMOPT_SOCKETDATA, s); | |
407 | curl_multi_setopt( s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb ); | |
408 | curl_multi_do(s); | |
409 | ||
410 | return 0; | |
411 | ||
412 | out: | |
413 | fprintf(stderr, "CURL: Error opening file: %s\n", state->errmsg); | |
414 | curl_easy_cleanup(state->curl); | |
415 | state->curl = NULL; | |
416 | out_noclean: | |
417 | g_free(file); | |
418 | return -EINVAL; | |
419 | } | |
420 | ||
421 | static int curl_aio_flush(void *opaque) | |
422 | { | |
423 | BDRVCURLState *s = opaque; | |
424 | int i, j; | |
425 | ||
426 | for (i=0; i < CURL_NUM_STATES; i++) { | |
427 | for(j=0; j < CURL_NUM_ACB; j++) { | |
428 | if (s->states[i].acb[j]) { | |
429 | return 1; | |
430 | } | |
431 | } | |
432 | } | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static void curl_aio_cancel(BlockDriverAIOCB *blockacb) | |
437 | { | |
438 | // Do we have to implement canceling? Seems to work without... | |
439 | } | |
440 | ||
441 | static const AIOCBInfo curl_aiocb_info = { | |
442 | .aiocb_size = sizeof(CURLAIOCB), | |
443 | .cancel = curl_aio_cancel, | |
444 | }; | |
445 | ||
446 | ||
447 | static void curl_readv_bh_cb(void *p) | |
448 | { | |
449 | CURLState *state; | |
450 | ||
451 | CURLAIOCB *acb = p; | |
452 | BDRVCURLState *s = acb->common.bs->opaque; | |
453 | ||
454 | qemu_bh_delete(acb->bh); | |
455 | acb->bh = NULL; | |
456 | ||
457 | size_t start = acb->sector_num * SECTOR_SIZE; | |
458 | size_t end; | |
459 | ||
460 | // In case we have the requested data already (e.g. read-ahead), | |
461 | // we can just call the callback and be done. | |
462 | switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) { | |
463 | case FIND_RET_OK: | |
464 | qemu_aio_release(acb); | |
465 | // fall through | |
466 | case FIND_RET_WAIT: | |
467 | return; | |
468 | default: | |
469 | break; | |
470 | } | |
471 | ||
472 | // No cache found, so let's start a new request | |
473 | state = curl_init_state(s); | |
474 | if (!state) { | |
475 | acb->common.cb(acb->common.opaque, -EIO); | |
476 | qemu_aio_release(acb); | |
477 | return; | |
478 | } | |
479 | ||
480 | acb->start = 0; | |
481 | acb->end = (acb->nb_sectors * SECTOR_SIZE); | |
482 | ||
483 | state->buf_off = 0; | |
484 | if (state->orig_buf) | |
485 | g_free(state->orig_buf); | |
486 | state->buf_start = start; | |
487 | state->buf_len = acb->end + s->readahead_size; | |
488 | end = MIN(start + state->buf_len, s->len) - 1; | |
489 | state->orig_buf = g_malloc(state->buf_len); | |
490 | state->acb[0] = acb; | |
491 | ||
492 | snprintf(state->range, 127, "%zd-%zd", start, end); | |
493 | DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n", | |
494 | (acb->nb_sectors * SECTOR_SIZE), start, state->range); | |
495 | curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range); | |
496 | ||
497 | curl_multi_add_handle(s->multi, state->curl); | |
498 | curl_multi_do(s); | |
499 | ||
500 | } | |
501 | ||
502 | static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs, | |
503 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
504 | BlockDriverCompletionFunc *cb, void *opaque) | |
505 | { | |
506 | CURLAIOCB *acb; | |
507 | ||
508 | acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque); | |
509 | ||
510 | acb->qiov = qiov; | |
511 | acb->sector_num = sector_num; | |
512 | acb->nb_sectors = nb_sectors; | |
513 | ||
514 | acb->bh = qemu_bh_new(curl_readv_bh_cb, acb); | |
515 | ||
516 | if (!acb->bh) { | |
517 | DPRINTF("CURL: qemu_bh_new failed\n"); | |
518 | return NULL; | |
519 | } | |
520 | ||
521 | qemu_bh_schedule(acb->bh); | |
522 | return &acb->common; | |
523 | } | |
524 | ||
525 | static void curl_close(BlockDriverState *bs) | |
526 | { | |
527 | BDRVCURLState *s = bs->opaque; | |
528 | int i; | |
529 | ||
530 | DPRINTF("CURL: Close\n"); | |
531 | for (i=0; i<CURL_NUM_STATES; i++) { | |
532 | if (s->states[i].in_use) | |
533 | curl_clean_state(&s->states[i]); | |
534 | if (s->states[i].curl) { | |
535 | curl_easy_cleanup(s->states[i].curl); | |
536 | s->states[i].curl = NULL; | |
537 | } | |
538 | if (s->states[i].orig_buf) { | |
539 | g_free(s->states[i].orig_buf); | |
540 | s->states[i].orig_buf = NULL; | |
541 | } | |
542 | } | |
543 | if (s->multi) | |
544 | curl_multi_cleanup(s->multi); | |
545 | g_free(s->url); | |
546 | } | |
547 | ||
548 | static int64_t curl_getlength(BlockDriverState *bs) | |
549 | { | |
550 | BDRVCURLState *s = bs->opaque; | |
551 | return s->len; | |
552 | } | |
553 | ||
554 | static BlockDriver bdrv_http = { | |
555 | .format_name = "http", | |
556 | .protocol_name = "http", | |
557 | ||
558 | .instance_size = sizeof(BDRVCURLState), | |
559 | .bdrv_file_open = curl_open, | |
560 | .bdrv_close = curl_close, | |
561 | .bdrv_getlength = curl_getlength, | |
562 | ||
563 | .bdrv_aio_readv = curl_aio_readv, | |
564 | }; | |
565 | ||
566 | static BlockDriver bdrv_https = { | |
567 | .format_name = "https", | |
568 | .protocol_name = "https", | |
569 | ||
570 | .instance_size = sizeof(BDRVCURLState), | |
571 | .bdrv_file_open = curl_open, | |
572 | .bdrv_close = curl_close, | |
573 | .bdrv_getlength = curl_getlength, | |
574 | ||
575 | .bdrv_aio_readv = curl_aio_readv, | |
576 | }; | |
577 | ||
578 | static BlockDriver bdrv_ftp = { | |
579 | .format_name = "ftp", | |
580 | .protocol_name = "ftp", | |
581 | ||
582 | .instance_size = sizeof(BDRVCURLState), | |
583 | .bdrv_file_open = curl_open, | |
584 | .bdrv_close = curl_close, | |
585 | .bdrv_getlength = curl_getlength, | |
586 | ||
587 | .bdrv_aio_readv = curl_aio_readv, | |
588 | }; | |
589 | ||
590 | static BlockDriver bdrv_ftps = { | |
591 | .format_name = "ftps", | |
592 | .protocol_name = "ftps", | |
593 | ||
594 | .instance_size = sizeof(BDRVCURLState), | |
595 | .bdrv_file_open = curl_open, | |
596 | .bdrv_close = curl_close, | |
597 | .bdrv_getlength = curl_getlength, | |
598 | ||
599 | .bdrv_aio_readv = curl_aio_readv, | |
600 | }; | |
601 | ||
602 | static BlockDriver bdrv_tftp = { | |
603 | .format_name = "tftp", | |
604 | .protocol_name = "tftp", | |
605 | ||
606 | .instance_size = sizeof(BDRVCURLState), | |
607 | .bdrv_file_open = curl_open, | |
608 | .bdrv_close = curl_close, | |
609 | .bdrv_getlength = curl_getlength, | |
610 | ||
611 | .bdrv_aio_readv = curl_aio_readv, | |
612 | }; | |
613 | ||
614 | static void curl_block_init(void) | |
615 | { | |
616 | bdrv_register(&bdrv_http); | |
617 | bdrv_register(&bdrv_https); | |
618 | bdrv_register(&bdrv_ftp); | |
619 | bdrv_register(&bdrv_ftps); | |
620 | bdrv_register(&bdrv_tftp); | |
621 | } | |
622 | ||
623 | block_init(curl_block_init); |