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1 | /* | |
2 | * QEMU System Emulator block driver | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
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 "config-host.h" | |
25 | #include "qemu-common.h" | |
26 | #include "trace.h" | |
27 | #include "monitor.h" | |
28 | #include "block_int.h" | |
29 | #include "module.h" | |
30 | #include "qjson.h" | |
31 | #include "qemu-coroutine.h" | |
32 | #include "qmp-commands.h" | |
33 | ||
34 | #ifdef CONFIG_BSD | |
35 | #include <sys/types.h> | |
36 | #include <sys/stat.h> | |
37 | #include <sys/ioctl.h> | |
38 | #include <sys/queue.h> | |
39 | #ifndef __DragonFly__ | |
40 | #include <sys/disk.h> | |
41 | #endif | |
42 | #endif | |
43 | ||
44 | #ifdef _WIN32 | |
45 | #include <windows.h> | |
46 | #endif | |
47 | ||
48 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ | |
49 | ||
50 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); | |
51 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, | |
52 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
53 | BlockDriverCompletionFunc *cb, void *opaque); | |
54 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, | |
55 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
56 | BlockDriverCompletionFunc *cb, void *opaque); | |
57 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
58 | int64_t sector_num, int nb_sectors, | |
59 | QEMUIOVector *iov); | |
60 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
61 | int64_t sector_num, int nb_sectors, | |
62 | QEMUIOVector *iov); | |
63 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
64 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); | |
65 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
66 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); | |
67 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, | |
68 | int64_t sector_num, | |
69 | QEMUIOVector *qiov, | |
70 | int nb_sectors, | |
71 | BlockDriverCompletionFunc *cb, | |
72 | void *opaque, | |
73 | bool is_write); | |
74 | static void coroutine_fn bdrv_co_do_rw(void *opaque); | |
75 | ||
76 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = | |
77 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
78 | ||
79 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = | |
80 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
81 | ||
82 | /* The device to use for VM snapshots */ | |
83 | static BlockDriverState *bs_snapshots; | |
84 | ||
85 | /* If non-zero, use only whitelisted block drivers */ | |
86 | static int use_bdrv_whitelist; | |
87 | ||
88 | #ifdef _WIN32 | |
89 | static int is_windows_drive_prefix(const char *filename) | |
90 | { | |
91 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
92 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
93 | filename[1] == ':'); | |
94 | } | |
95 | ||
96 | int is_windows_drive(const char *filename) | |
97 | { | |
98 | if (is_windows_drive_prefix(filename) && | |
99 | filename[2] == '\0') | |
100 | return 1; | |
101 | if (strstart(filename, "\\\\.\\", NULL) || | |
102 | strstart(filename, "//./", NULL)) | |
103 | return 1; | |
104 | return 0; | |
105 | } | |
106 | #endif | |
107 | ||
108 | /* check if the path starts with "<protocol>:" */ | |
109 | static int path_has_protocol(const char *path) | |
110 | { | |
111 | #ifdef _WIN32 | |
112 | if (is_windows_drive(path) || | |
113 | is_windows_drive_prefix(path)) { | |
114 | return 0; | |
115 | } | |
116 | #endif | |
117 | ||
118 | return strchr(path, ':') != NULL; | |
119 | } | |
120 | ||
121 | int path_is_absolute(const char *path) | |
122 | { | |
123 | const char *p; | |
124 | #ifdef _WIN32 | |
125 | /* specific case for names like: "\\.\d:" */ | |
126 | if (*path == '/' || *path == '\\') | |
127 | return 1; | |
128 | #endif | |
129 | p = strchr(path, ':'); | |
130 | if (p) | |
131 | p++; | |
132 | else | |
133 | p = path; | |
134 | #ifdef _WIN32 | |
135 | return (*p == '/' || *p == '\\'); | |
136 | #else | |
137 | return (*p == '/'); | |
138 | #endif | |
139 | } | |
140 | ||
141 | /* if filename is absolute, just copy it to dest. Otherwise, build a | |
142 | path to it by considering it is relative to base_path. URL are | |
143 | supported. */ | |
144 | void path_combine(char *dest, int dest_size, | |
145 | const char *base_path, | |
146 | const char *filename) | |
147 | { | |
148 | const char *p, *p1; | |
149 | int len; | |
150 | ||
151 | if (dest_size <= 0) | |
152 | return; | |
153 | if (path_is_absolute(filename)) { | |
154 | pstrcpy(dest, dest_size, filename); | |
155 | } else { | |
156 | p = strchr(base_path, ':'); | |
157 | if (p) | |
158 | p++; | |
159 | else | |
160 | p = base_path; | |
161 | p1 = strrchr(base_path, '/'); | |
162 | #ifdef _WIN32 | |
163 | { | |
164 | const char *p2; | |
165 | p2 = strrchr(base_path, '\\'); | |
166 | if (!p1 || p2 > p1) | |
167 | p1 = p2; | |
168 | } | |
169 | #endif | |
170 | if (p1) | |
171 | p1++; | |
172 | else | |
173 | p1 = base_path; | |
174 | if (p1 > p) | |
175 | p = p1; | |
176 | len = p - base_path; | |
177 | if (len > dest_size - 1) | |
178 | len = dest_size - 1; | |
179 | memcpy(dest, base_path, len); | |
180 | dest[len] = '\0'; | |
181 | pstrcat(dest, dest_size, filename); | |
182 | } | |
183 | } | |
184 | ||
185 | void bdrv_register(BlockDriver *bdrv) | |
186 | { | |
187 | /* Block drivers without coroutine functions need emulation */ | |
188 | if (!bdrv->bdrv_co_readv) { | |
189 | bdrv->bdrv_co_readv = bdrv_co_readv_em; | |
190 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
191 | ||
192 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if | |
193 | * the block driver lacks aio we need to emulate that too. | |
194 | */ | |
195 | if (!bdrv->bdrv_aio_readv) { | |
196 | /* add AIO emulation layer */ | |
197 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
198 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
199 | } | |
200 | } | |
201 | ||
202 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); | |
203 | } | |
204 | ||
205 | /* create a new block device (by default it is empty) */ | |
206 | BlockDriverState *bdrv_new(const char *device_name) | |
207 | { | |
208 | BlockDriverState *bs; | |
209 | ||
210 | bs = g_malloc0(sizeof(BlockDriverState)); | |
211 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
212 | if (device_name[0] != '\0') { | |
213 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); | |
214 | } | |
215 | bdrv_iostatus_disable(bs); | |
216 | return bs; | |
217 | } | |
218 | ||
219 | BlockDriver *bdrv_find_format(const char *format_name) | |
220 | { | |
221 | BlockDriver *drv1; | |
222 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
223 | if (!strcmp(drv1->format_name, format_name)) { | |
224 | return drv1; | |
225 | } | |
226 | } | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | static int bdrv_is_whitelisted(BlockDriver *drv) | |
231 | { | |
232 | static const char *whitelist[] = { | |
233 | CONFIG_BDRV_WHITELIST | |
234 | }; | |
235 | const char **p; | |
236 | ||
237 | if (!whitelist[0]) | |
238 | return 1; /* no whitelist, anything goes */ | |
239 | ||
240 | for (p = whitelist; *p; p++) { | |
241 | if (!strcmp(drv->format_name, *p)) { | |
242 | return 1; | |
243 | } | |
244 | } | |
245 | return 0; | |
246 | } | |
247 | ||
248 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
249 | { | |
250 | BlockDriver *drv = bdrv_find_format(format_name); | |
251 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
252 | } | |
253 | ||
254 | int bdrv_create(BlockDriver *drv, const char* filename, | |
255 | QEMUOptionParameter *options) | |
256 | { | |
257 | if (!drv->bdrv_create) | |
258 | return -ENOTSUP; | |
259 | ||
260 | return drv->bdrv_create(filename, options); | |
261 | } | |
262 | ||
263 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) | |
264 | { | |
265 | BlockDriver *drv; | |
266 | ||
267 | drv = bdrv_find_protocol(filename); | |
268 | if (drv == NULL) { | |
269 | return -ENOENT; | |
270 | } | |
271 | ||
272 | return bdrv_create(drv, filename, options); | |
273 | } | |
274 | ||
275 | #ifdef _WIN32 | |
276 | void get_tmp_filename(char *filename, int size) | |
277 | { | |
278 | char temp_dir[MAX_PATH]; | |
279 | ||
280 | GetTempPath(MAX_PATH, temp_dir); | |
281 | GetTempFileName(temp_dir, "qem", 0, filename); | |
282 | } | |
283 | #else | |
284 | void get_tmp_filename(char *filename, int size) | |
285 | { | |
286 | int fd; | |
287 | const char *tmpdir; | |
288 | /* XXX: race condition possible */ | |
289 | tmpdir = getenv("TMPDIR"); | |
290 | if (!tmpdir) | |
291 | tmpdir = "/tmp"; | |
292 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
293 | fd = mkstemp(filename); | |
294 | close(fd); | |
295 | } | |
296 | #endif | |
297 | ||
298 | /* | |
299 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
300 | * recognized as a host CDROM. | |
301 | */ | |
302 | static BlockDriver *find_hdev_driver(const char *filename) | |
303 | { | |
304 | int score_max = 0, score; | |
305 | BlockDriver *drv = NULL, *d; | |
306 | ||
307 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
308 | if (d->bdrv_probe_device) { | |
309 | score = d->bdrv_probe_device(filename); | |
310 | if (score > score_max) { | |
311 | score_max = score; | |
312 | drv = d; | |
313 | } | |
314 | } | |
315 | } | |
316 | ||
317 | return drv; | |
318 | } | |
319 | ||
320 | BlockDriver *bdrv_find_protocol(const char *filename) | |
321 | { | |
322 | BlockDriver *drv1; | |
323 | char protocol[128]; | |
324 | int len; | |
325 | const char *p; | |
326 | ||
327 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ | |
328 | ||
329 | /* | |
330 | * XXX(hch): we really should not let host device detection | |
331 | * override an explicit protocol specification, but moving this | |
332 | * later breaks access to device names with colons in them. | |
333 | * Thanks to the brain-dead persistent naming schemes on udev- | |
334 | * based Linux systems those actually are quite common. | |
335 | */ | |
336 | drv1 = find_hdev_driver(filename); | |
337 | if (drv1) { | |
338 | return drv1; | |
339 | } | |
340 | ||
341 | if (!path_has_protocol(filename)) { | |
342 | return bdrv_find_format("file"); | |
343 | } | |
344 | p = strchr(filename, ':'); | |
345 | assert(p != NULL); | |
346 | len = p - filename; | |
347 | if (len > sizeof(protocol) - 1) | |
348 | len = sizeof(protocol) - 1; | |
349 | memcpy(protocol, filename, len); | |
350 | protocol[len] = '\0'; | |
351 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
352 | if (drv1->protocol_name && | |
353 | !strcmp(drv1->protocol_name, protocol)) { | |
354 | return drv1; | |
355 | } | |
356 | } | |
357 | return NULL; | |
358 | } | |
359 | ||
360 | static int find_image_format(const char *filename, BlockDriver **pdrv) | |
361 | { | |
362 | int ret, score, score_max; | |
363 | BlockDriver *drv1, *drv; | |
364 | uint8_t buf[2048]; | |
365 | BlockDriverState *bs; | |
366 | ||
367 | ret = bdrv_file_open(&bs, filename, 0); | |
368 | if (ret < 0) { | |
369 | *pdrv = NULL; | |
370 | return ret; | |
371 | } | |
372 | ||
373 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ | |
374 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
375 | bdrv_delete(bs); | |
376 | drv = bdrv_find_format("raw"); | |
377 | if (!drv) { | |
378 | ret = -ENOENT; | |
379 | } | |
380 | *pdrv = drv; | |
381 | return ret; | |
382 | } | |
383 | ||
384 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
385 | bdrv_delete(bs); | |
386 | if (ret < 0) { | |
387 | *pdrv = NULL; | |
388 | return ret; | |
389 | } | |
390 | ||
391 | score_max = 0; | |
392 | drv = NULL; | |
393 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
394 | if (drv1->bdrv_probe) { | |
395 | score = drv1->bdrv_probe(buf, ret, filename); | |
396 | if (score > score_max) { | |
397 | score_max = score; | |
398 | drv = drv1; | |
399 | } | |
400 | } | |
401 | } | |
402 | if (!drv) { | |
403 | ret = -ENOENT; | |
404 | } | |
405 | *pdrv = drv; | |
406 | return ret; | |
407 | } | |
408 | ||
409 | /** | |
410 | * Set the current 'total_sectors' value | |
411 | */ | |
412 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
413 | { | |
414 | BlockDriver *drv = bs->drv; | |
415 | ||
416 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ | |
417 | if (bs->sg) | |
418 | return 0; | |
419 | ||
420 | /* query actual device if possible, otherwise just trust the hint */ | |
421 | if (drv->bdrv_getlength) { | |
422 | int64_t length = drv->bdrv_getlength(bs); | |
423 | if (length < 0) { | |
424 | return length; | |
425 | } | |
426 | hint = length >> BDRV_SECTOR_BITS; | |
427 | } | |
428 | ||
429 | bs->total_sectors = hint; | |
430 | return 0; | |
431 | } | |
432 | ||
433 | /** | |
434 | * Set open flags for a given cache mode | |
435 | * | |
436 | * Return 0 on success, -1 if the cache mode was invalid. | |
437 | */ | |
438 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
439 | { | |
440 | *flags &= ~BDRV_O_CACHE_MASK; | |
441 | ||
442 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
443 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
444 | } else if (!strcmp(mode, "directsync")) { | |
445 | *flags |= BDRV_O_NOCACHE; | |
446 | } else if (!strcmp(mode, "writeback")) { | |
447 | *flags |= BDRV_O_CACHE_WB; | |
448 | } else if (!strcmp(mode, "unsafe")) { | |
449 | *flags |= BDRV_O_CACHE_WB; | |
450 | *flags |= BDRV_O_NO_FLUSH; | |
451 | } else if (!strcmp(mode, "writethrough")) { | |
452 | /* this is the default */ | |
453 | } else { | |
454 | return -1; | |
455 | } | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | /* | |
461 | * Common part for opening disk images and files | |
462 | */ | |
463 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
464 | int flags, BlockDriver *drv) | |
465 | { | |
466 | int ret, open_flags; | |
467 | ||
468 | assert(drv != NULL); | |
469 | ||
470 | trace_bdrv_open_common(bs, filename, flags, drv->format_name); | |
471 | ||
472 | bs->file = NULL; | |
473 | bs->total_sectors = 0; | |
474 | bs->encrypted = 0; | |
475 | bs->valid_key = 0; | |
476 | bs->sg = 0; | |
477 | bs->open_flags = flags; | |
478 | bs->growable = 0; | |
479 | bs->buffer_alignment = 512; | |
480 | ||
481 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
482 | bs->backing_file[0] = '\0'; | |
483 | ||
484 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
485 | return -ENOTSUP; | |
486 | } | |
487 | ||
488 | bs->drv = drv; | |
489 | bs->opaque = g_malloc0(drv->instance_size); | |
490 | ||
491 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); | |
492 | ||
493 | /* | |
494 | * Clear flags that are internal to the block layer before opening the | |
495 | * image. | |
496 | */ | |
497 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
498 | ||
499 | /* | |
500 | * Snapshots should be writable. | |
501 | */ | |
502 | if (bs->is_temporary) { | |
503 | open_flags |= BDRV_O_RDWR; | |
504 | } | |
505 | ||
506 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
507 | ||
508 | /* Open the image, either directly or using a protocol */ | |
509 | if (drv->bdrv_file_open) { | |
510 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
511 | } else { | |
512 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
513 | if (ret >= 0) { | |
514 | ret = drv->bdrv_open(bs, open_flags); | |
515 | } | |
516 | } | |
517 | ||
518 | if (ret < 0) { | |
519 | goto free_and_fail; | |
520 | } | |
521 | ||
522 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
523 | if (ret < 0) { | |
524 | goto free_and_fail; | |
525 | } | |
526 | ||
527 | #ifndef _WIN32 | |
528 | if (bs->is_temporary) { | |
529 | unlink(filename); | |
530 | } | |
531 | #endif | |
532 | return 0; | |
533 | ||
534 | free_and_fail: | |
535 | if (bs->file) { | |
536 | bdrv_delete(bs->file); | |
537 | bs->file = NULL; | |
538 | } | |
539 | g_free(bs->opaque); | |
540 | bs->opaque = NULL; | |
541 | bs->drv = NULL; | |
542 | return ret; | |
543 | } | |
544 | ||
545 | /* | |
546 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
547 | */ | |
548 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) | |
549 | { | |
550 | BlockDriverState *bs; | |
551 | BlockDriver *drv; | |
552 | int ret; | |
553 | ||
554 | drv = bdrv_find_protocol(filename); | |
555 | if (!drv) { | |
556 | return -ENOENT; | |
557 | } | |
558 | ||
559 | bs = bdrv_new(""); | |
560 | ret = bdrv_open_common(bs, filename, flags, drv); | |
561 | if (ret < 0) { | |
562 | bdrv_delete(bs); | |
563 | return ret; | |
564 | } | |
565 | bs->growable = 1; | |
566 | *pbs = bs; | |
567 | return 0; | |
568 | } | |
569 | ||
570 | /* | |
571 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
572 | */ | |
573 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, | |
574 | BlockDriver *drv) | |
575 | { | |
576 | int ret; | |
577 | char tmp_filename[PATH_MAX]; | |
578 | ||
579 | if (flags & BDRV_O_SNAPSHOT) { | |
580 | BlockDriverState *bs1; | |
581 | int64_t total_size; | |
582 | int is_protocol = 0; | |
583 | BlockDriver *bdrv_qcow2; | |
584 | QEMUOptionParameter *options; | |
585 | char backing_filename[PATH_MAX]; | |
586 | ||
587 | /* if snapshot, we create a temporary backing file and open it | |
588 | instead of opening 'filename' directly */ | |
589 | ||
590 | /* if there is a backing file, use it */ | |
591 | bs1 = bdrv_new(""); | |
592 | ret = bdrv_open(bs1, filename, 0, drv); | |
593 | if (ret < 0) { | |
594 | bdrv_delete(bs1); | |
595 | return ret; | |
596 | } | |
597 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; | |
598 | ||
599 | if (bs1->drv && bs1->drv->protocol_name) | |
600 | is_protocol = 1; | |
601 | ||
602 | bdrv_delete(bs1); | |
603 | ||
604 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); | |
605 | ||
606 | /* Real path is meaningless for protocols */ | |
607 | if (is_protocol) | |
608 | snprintf(backing_filename, sizeof(backing_filename), | |
609 | "%s", filename); | |
610 | else if (!realpath(filename, backing_filename)) | |
611 | return -errno; | |
612 | ||
613 | bdrv_qcow2 = bdrv_find_format("qcow2"); | |
614 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
615 | ||
616 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); | |
617 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
618 | if (drv) { | |
619 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
620 | drv->format_name); | |
621 | } | |
622 | ||
623 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
624 | free_option_parameters(options); | |
625 | if (ret < 0) { | |
626 | return ret; | |
627 | } | |
628 | ||
629 | filename = tmp_filename; | |
630 | drv = bdrv_qcow2; | |
631 | bs->is_temporary = 1; | |
632 | } | |
633 | ||
634 | /* Find the right image format driver */ | |
635 | if (!drv) { | |
636 | ret = find_image_format(filename, &drv); | |
637 | } | |
638 | ||
639 | if (!drv) { | |
640 | goto unlink_and_fail; | |
641 | } | |
642 | ||
643 | /* Open the image */ | |
644 | ret = bdrv_open_common(bs, filename, flags, drv); | |
645 | if (ret < 0) { | |
646 | goto unlink_and_fail; | |
647 | } | |
648 | ||
649 | /* If there is a backing file, use it */ | |
650 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
651 | char backing_filename[PATH_MAX]; | |
652 | int back_flags; | |
653 | BlockDriver *back_drv = NULL; | |
654 | ||
655 | bs->backing_hd = bdrv_new(""); | |
656 | ||
657 | if (path_has_protocol(bs->backing_file)) { | |
658 | pstrcpy(backing_filename, sizeof(backing_filename), | |
659 | bs->backing_file); | |
660 | } else { | |
661 | path_combine(backing_filename, sizeof(backing_filename), | |
662 | filename, bs->backing_file); | |
663 | } | |
664 | ||
665 | if (bs->backing_format[0] != '\0') { | |
666 | back_drv = bdrv_find_format(bs->backing_format); | |
667 | } | |
668 | ||
669 | /* backing files always opened read-only */ | |
670 | back_flags = | |
671 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
672 | ||
673 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
674 | if (ret < 0) { | |
675 | bdrv_close(bs); | |
676 | return ret; | |
677 | } | |
678 | if (bs->is_temporary) { | |
679 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
680 | } else { | |
681 | /* base image inherits from "parent" */ | |
682 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
683 | } | |
684 | } | |
685 | ||
686 | if (!bdrv_key_required(bs)) { | |
687 | bdrv_dev_change_media_cb(bs, true); | |
688 | } | |
689 | ||
690 | return 0; | |
691 | ||
692 | unlink_and_fail: | |
693 | if (bs->is_temporary) { | |
694 | unlink(filename); | |
695 | } | |
696 | return ret; | |
697 | } | |
698 | ||
699 | void bdrv_close(BlockDriverState *bs) | |
700 | { | |
701 | if (bs->drv) { | |
702 | if (bs == bs_snapshots) { | |
703 | bs_snapshots = NULL; | |
704 | } | |
705 | if (bs->backing_hd) { | |
706 | bdrv_delete(bs->backing_hd); | |
707 | bs->backing_hd = NULL; | |
708 | } | |
709 | bs->drv->bdrv_close(bs); | |
710 | g_free(bs->opaque); | |
711 | #ifdef _WIN32 | |
712 | if (bs->is_temporary) { | |
713 | unlink(bs->filename); | |
714 | } | |
715 | #endif | |
716 | bs->opaque = NULL; | |
717 | bs->drv = NULL; | |
718 | ||
719 | if (bs->file != NULL) { | |
720 | bdrv_close(bs->file); | |
721 | } | |
722 | ||
723 | bdrv_dev_change_media_cb(bs, false); | |
724 | } | |
725 | } | |
726 | ||
727 | void bdrv_close_all(void) | |
728 | { | |
729 | BlockDriverState *bs; | |
730 | ||
731 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
732 | bdrv_close(bs); | |
733 | } | |
734 | } | |
735 | ||
736 | /* make a BlockDriverState anonymous by removing from bdrv_state list. | |
737 | Also, NULL terminate the device_name to prevent double remove */ | |
738 | void bdrv_make_anon(BlockDriverState *bs) | |
739 | { | |
740 | if (bs->device_name[0] != '\0') { | |
741 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
742 | } | |
743 | bs->device_name[0] = '\0'; | |
744 | } | |
745 | ||
746 | void bdrv_delete(BlockDriverState *bs) | |
747 | { | |
748 | assert(!bs->dev); | |
749 | ||
750 | /* remove from list, if necessary */ | |
751 | bdrv_make_anon(bs); | |
752 | ||
753 | bdrv_close(bs); | |
754 | if (bs->file != NULL) { | |
755 | bdrv_delete(bs->file); | |
756 | } | |
757 | ||
758 | assert(bs != bs_snapshots); | |
759 | g_free(bs); | |
760 | } | |
761 | ||
762 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) | |
763 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
764 | { | |
765 | if (bs->dev) { | |
766 | return -EBUSY; | |
767 | } | |
768 | bs->dev = dev; | |
769 | bdrv_iostatus_reset(bs); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ | |
774 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
775 | { | |
776 | if (bdrv_attach_dev(bs, dev) < 0) { | |
777 | abort(); | |
778 | } | |
779 | } | |
780 | ||
781 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
782 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
783 | { | |
784 | assert(bs->dev == dev); | |
785 | bs->dev = NULL; | |
786 | bs->dev_ops = NULL; | |
787 | bs->dev_opaque = NULL; | |
788 | bs->buffer_alignment = 512; | |
789 | } | |
790 | ||
791 | /* TODO change to return DeviceState * when all users are qdevified */ | |
792 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
793 | { | |
794 | return bs->dev; | |
795 | } | |
796 | ||
797 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, | |
798 | void *opaque) | |
799 | { | |
800 | bs->dev_ops = ops; | |
801 | bs->dev_opaque = opaque; | |
802 | if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { | |
803 | bs_snapshots = NULL; | |
804 | } | |
805 | } | |
806 | ||
807 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) | |
808 | { | |
809 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { | |
810 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); | |
811 | } | |
812 | } | |
813 | ||
814 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) | |
815 | { | |
816 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
817 | } | |
818 | ||
819 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) | |
820 | { | |
821 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
822 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
823 | } | |
824 | } | |
825 | ||
826 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) | |
827 | { | |
828 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
829 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
830 | } | |
831 | return false; | |
832 | } | |
833 | ||
834 | static void bdrv_dev_resize_cb(BlockDriverState *bs) | |
835 | { | |
836 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
837 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
838 | } | |
839 | } | |
840 | ||
841 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) | |
842 | { | |
843 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
844 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
845 | } | |
846 | return false; | |
847 | } | |
848 | ||
849 | /* | |
850 | * Run consistency checks on an image | |
851 | * | |
852 | * Returns 0 if the check could be completed (it doesn't mean that the image is | |
853 | * free of errors) or -errno when an internal error occurred. The results of the | |
854 | * check are stored in res. | |
855 | */ | |
856 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) | |
857 | { | |
858 | if (bs->drv->bdrv_check == NULL) { | |
859 | return -ENOTSUP; | |
860 | } | |
861 | ||
862 | memset(res, 0, sizeof(*res)); | |
863 | return bs->drv->bdrv_check(bs, res); | |
864 | } | |
865 | ||
866 | #define COMMIT_BUF_SECTORS 2048 | |
867 | ||
868 | /* commit COW file into the raw image */ | |
869 | int bdrv_commit(BlockDriverState *bs) | |
870 | { | |
871 | BlockDriver *drv = bs->drv; | |
872 | BlockDriver *backing_drv; | |
873 | int64_t sector, total_sectors; | |
874 | int n, ro, open_flags; | |
875 | int ret = 0, rw_ret = 0; | |
876 | uint8_t *buf; | |
877 | char filename[1024]; | |
878 | BlockDriverState *bs_rw, *bs_ro; | |
879 | ||
880 | if (!drv) | |
881 | return -ENOMEDIUM; | |
882 | ||
883 | if (!bs->backing_hd) { | |
884 | return -ENOTSUP; | |
885 | } | |
886 | ||
887 | if (bs->backing_hd->keep_read_only) { | |
888 | return -EACCES; | |
889 | } | |
890 | ||
891 | backing_drv = bs->backing_hd->drv; | |
892 | ro = bs->backing_hd->read_only; | |
893 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
894 | open_flags = bs->backing_hd->open_flags; | |
895 | ||
896 | if (ro) { | |
897 | /* re-open as RW */ | |
898 | bdrv_delete(bs->backing_hd); | |
899 | bs->backing_hd = NULL; | |
900 | bs_rw = bdrv_new(""); | |
901 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, | |
902 | backing_drv); | |
903 | if (rw_ret < 0) { | |
904 | bdrv_delete(bs_rw); | |
905 | /* try to re-open read-only */ | |
906 | bs_ro = bdrv_new(""); | |
907 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, | |
908 | backing_drv); | |
909 | if (ret < 0) { | |
910 | bdrv_delete(bs_ro); | |
911 | /* drive not functional anymore */ | |
912 | bs->drv = NULL; | |
913 | return ret; | |
914 | } | |
915 | bs->backing_hd = bs_ro; | |
916 | return rw_ret; | |
917 | } | |
918 | bs->backing_hd = bs_rw; | |
919 | } | |
920 | ||
921 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; | |
922 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); | |
923 | ||
924 | for (sector = 0; sector < total_sectors; sector += n) { | |
925 | if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { | |
926 | ||
927 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
928 | ret = -EIO; | |
929 | goto ro_cleanup; | |
930 | } | |
931 | ||
932 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
933 | ret = -EIO; | |
934 | goto ro_cleanup; | |
935 | } | |
936 | } | |
937 | } | |
938 | ||
939 | if (drv->bdrv_make_empty) { | |
940 | ret = drv->bdrv_make_empty(bs); | |
941 | bdrv_flush(bs); | |
942 | } | |
943 | ||
944 | /* | |
945 | * Make sure all data we wrote to the backing device is actually | |
946 | * stable on disk. | |
947 | */ | |
948 | if (bs->backing_hd) | |
949 | bdrv_flush(bs->backing_hd); | |
950 | ||
951 | ro_cleanup: | |
952 | g_free(buf); | |
953 | ||
954 | if (ro) { | |
955 | /* re-open as RO */ | |
956 | bdrv_delete(bs->backing_hd); | |
957 | bs->backing_hd = NULL; | |
958 | bs_ro = bdrv_new(""); | |
959 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, | |
960 | backing_drv); | |
961 | if (ret < 0) { | |
962 | bdrv_delete(bs_ro); | |
963 | /* drive not functional anymore */ | |
964 | bs->drv = NULL; | |
965 | return ret; | |
966 | } | |
967 | bs->backing_hd = bs_ro; | |
968 | bs->backing_hd->keep_read_only = 0; | |
969 | } | |
970 | ||
971 | return ret; | |
972 | } | |
973 | ||
974 | void bdrv_commit_all(void) | |
975 | { | |
976 | BlockDriverState *bs; | |
977 | ||
978 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
979 | bdrv_commit(bs); | |
980 | } | |
981 | } | |
982 | ||
983 | /* | |
984 | * Return values: | |
985 | * 0 - success | |
986 | * -EINVAL - backing format specified, but no file | |
987 | * -ENOSPC - can't update the backing file because no space is left in the | |
988 | * image file header | |
989 | * -ENOTSUP - format driver doesn't support changing the backing file | |
990 | */ | |
991 | int bdrv_change_backing_file(BlockDriverState *bs, | |
992 | const char *backing_file, const char *backing_fmt) | |
993 | { | |
994 | BlockDriver *drv = bs->drv; | |
995 | ||
996 | if (drv->bdrv_change_backing_file != NULL) { | |
997 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
998 | } else { | |
999 | return -ENOTSUP; | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, | |
1004 | size_t size) | |
1005 | { | |
1006 | int64_t len; | |
1007 | ||
1008 | if (!bdrv_is_inserted(bs)) | |
1009 | return -ENOMEDIUM; | |
1010 | ||
1011 | if (bs->growable) | |
1012 | return 0; | |
1013 | ||
1014 | len = bdrv_getlength(bs); | |
1015 | ||
1016 | if (offset < 0) | |
1017 | return -EIO; | |
1018 | ||
1019 | if ((offset > len) || (len - offset < size)) | |
1020 | return -EIO; | |
1021 | ||
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
1026 | int nb_sectors) | |
1027 | { | |
1028 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, | |
1029 | nb_sectors * BDRV_SECTOR_SIZE); | |
1030 | } | |
1031 | ||
1032 | typedef struct RwCo { | |
1033 | BlockDriverState *bs; | |
1034 | int64_t sector_num; | |
1035 | int nb_sectors; | |
1036 | QEMUIOVector *qiov; | |
1037 | bool is_write; | |
1038 | int ret; | |
1039 | } RwCo; | |
1040 | ||
1041 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
1042 | { | |
1043 | RwCo *rwco = opaque; | |
1044 | ||
1045 | if (!rwco->is_write) { | |
1046 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
1047 | rwco->nb_sectors, rwco->qiov); | |
1048 | } else { | |
1049 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
1050 | rwco->nb_sectors, rwco->qiov); | |
1051 | } | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Process a synchronous request using coroutines | |
1056 | */ | |
1057 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
1058 | int nb_sectors, bool is_write) | |
1059 | { | |
1060 | QEMUIOVector qiov; | |
1061 | struct iovec iov = { | |
1062 | .iov_base = (void *)buf, | |
1063 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1064 | }; | |
1065 | Coroutine *co; | |
1066 | RwCo rwco = { | |
1067 | .bs = bs, | |
1068 | .sector_num = sector_num, | |
1069 | .nb_sectors = nb_sectors, | |
1070 | .qiov = &qiov, | |
1071 | .is_write = is_write, | |
1072 | .ret = NOT_DONE, | |
1073 | }; | |
1074 | ||
1075 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1076 | ||
1077 | if (qemu_in_coroutine()) { | |
1078 | /* Fast-path if already in coroutine context */ | |
1079 | bdrv_rw_co_entry(&rwco); | |
1080 | } else { | |
1081 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
1082 | qemu_coroutine_enter(co, &rwco); | |
1083 | while (rwco.ret == NOT_DONE) { | |
1084 | qemu_aio_wait(); | |
1085 | } | |
1086 | } | |
1087 | return rwco.ret; | |
1088 | } | |
1089 | ||
1090 | /* return < 0 if error. See bdrv_write() for the return codes */ | |
1091 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
1092 | uint8_t *buf, int nb_sectors) | |
1093 | { | |
1094 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); | |
1095 | } | |
1096 | ||
1097 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, | |
1098 | int nb_sectors, int dirty) | |
1099 | { | |
1100 | int64_t start, end; | |
1101 | unsigned long val, idx, bit; | |
1102 | ||
1103 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
1104 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
1105 | ||
1106 | for (; start <= end; start++) { | |
1107 | idx = start / (sizeof(unsigned long) * 8); | |
1108 | bit = start % (sizeof(unsigned long) * 8); | |
1109 | val = bs->dirty_bitmap[idx]; | |
1110 | if (dirty) { | |
1111 | if (!(val & (1UL << bit))) { | |
1112 | bs->dirty_count++; | |
1113 | val |= 1UL << bit; | |
1114 | } | |
1115 | } else { | |
1116 | if (val & (1UL << bit)) { | |
1117 | bs->dirty_count--; | |
1118 | val &= ~(1UL << bit); | |
1119 | } | |
1120 | } | |
1121 | bs->dirty_bitmap[idx] = val; | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | /* Return < 0 if error. Important errors are: | |
1126 | -EIO generic I/O error (may happen for all errors) | |
1127 | -ENOMEDIUM No media inserted. | |
1128 | -EINVAL Invalid sector number or nb_sectors | |
1129 | -EACCES Trying to write a read-only device | |
1130 | */ | |
1131 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, | |
1132 | const uint8_t *buf, int nb_sectors) | |
1133 | { | |
1134 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); | |
1135 | } | |
1136 | ||
1137 | int bdrv_pread(BlockDriverState *bs, int64_t offset, | |
1138 | void *buf, int count1) | |
1139 | { | |
1140 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; | |
1141 | int len, nb_sectors, count; | |
1142 | int64_t sector_num; | |
1143 | int ret; | |
1144 | ||
1145 | count = count1; | |
1146 | /* first read to align to sector start */ | |
1147 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); | |
1148 | if (len > count) | |
1149 | len = count; | |
1150 | sector_num = offset >> BDRV_SECTOR_BITS; | |
1151 | if (len > 0) { | |
1152 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1153 | return ret; | |
1154 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); | |
1155 | count -= len; | |
1156 | if (count == 0) | |
1157 | return count1; | |
1158 | sector_num++; | |
1159 | buf += len; | |
1160 | } | |
1161 | ||
1162 | /* read the sectors "in place" */ | |
1163 | nb_sectors = count >> BDRV_SECTOR_BITS; | |
1164 | if (nb_sectors > 0) { | |
1165 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) | |
1166 | return ret; | |
1167 | sector_num += nb_sectors; | |
1168 | len = nb_sectors << BDRV_SECTOR_BITS; | |
1169 | buf += len; | |
1170 | count -= len; | |
1171 | } | |
1172 | ||
1173 | /* add data from the last sector */ | |
1174 | if (count > 0) { | |
1175 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1176 | return ret; | |
1177 | memcpy(buf, tmp_buf, count); | |
1178 | } | |
1179 | return count1; | |
1180 | } | |
1181 | ||
1182 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
1183 | const void *buf, int count1) | |
1184 | { | |
1185 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; | |
1186 | int len, nb_sectors, count; | |
1187 | int64_t sector_num; | |
1188 | int ret; | |
1189 | ||
1190 | count = count1; | |
1191 | /* first write to align to sector start */ | |
1192 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); | |
1193 | if (len > count) | |
1194 | len = count; | |
1195 | sector_num = offset >> BDRV_SECTOR_BITS; | |
1196 | if (len > 0) { | |
1197 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1198 | return ret; | |
1199 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); | |
1200 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) | |
1201 | return ret; | |
1202 | count -= len; | |
1203 | if (count == 0) | |
1204 | return count1; | |
1205 | sector_num++; | |
1206 | buf += len; | |
1207 | } | |
1208 | ||
1209 | /* write the sectors "in place" */ | |
1210 | nb_sectors = count >> BDRV_SECTOR_BITS; | |
1211 | if (nb_sectors > 0) { | |
1212 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) | |
1213 | return ret; | |
1214 | sector_num += nb_sectors; | |
1215 | len = nb_sectors << BDRV_SECTOR_BITS; | |
1216 | buf += len; | |
1217 | count -= len; | |
1218 | } | |
1219 | ||
1220 | /* add data from the last sector */ | |
1221 | if (count > 0) { | |
1222 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1223 | return ret; | |
1224 | memcpy(tmp_buf, buf, count); | |
1225 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) | |
1226 | return ret; | |
1227 | } | |
1228 | return count1; | |
1229 | } | |
1230 | ||
1231 | /* | |
1232 | * Writes to the file and ensures that no writes are reordered across this | |
1233 | * request (acts as a barrier) | |
1234 | * | |
1235 | * Returns 0 on success, -errno in error cases. | |
1236 | */ | |
1237 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1238 | const void *buf, int count) | |
1239 | { | |
1240 | int ret; | |
1241 | ||
1242 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1243 | if (ret < 0) { | |
1244 | return ret; | |
1245 | } | |
1246 | ||
1247 | /* No flush needed for cache modes that use O_DSYNC */ | |
1248 | if ((bs->open_flags & BDRV_O_CACHE_WB) != 0) { | |
1249 | bdrv_flush(bs); | |
1250 | } | |
1251 | ||
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Handle a read request in coroutine context | |
1257 | */ | |
1258 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
1259 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
1260 | { | |
1261 | BlockDriver *drv = bs->drv; | |
1262 | ||
1263 | if (!drv) { | |
1264 | return -ENOMEDIUM; | |
1265 | } | |
1266 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1267 | return -EIO; | |
1268 | } | |
1269 | ||
1270 | return drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
1271 | } | |
1272 | ||
1273 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, | |
1274 | int nb_sectors, QEMUIOVector *qiov) | |
1275 | { | |
1276 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); | |
1277 | ||
1278 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov); | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * Handle a write request in coroutine context | |
1283 | */ | |
1284 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
1285 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
1286 | { | |
1287 | BlockDriver *drv = bs->drv; | |
1288 | int ret; | |
1289 | ||
1290 | if (!bs->drv) { | |
1291 | return -ENOMEDIUM; | |
1292 | } | |
1293 | if (bs->read_only) { | |
1294 | return -EACCES; | |
1295 | } | |
1296 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1297 | return -EIO; | |
1298 | } | |
1299 | ||
1300 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
1301 | ||
1302 | if (bs->dirty_bitmap) { | |
1303 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1304 | } | |
1305 | ||
1306 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1307 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1308 | } | |
1309 | ||
1310 | return ret; | |
1311 | } | |
1312 | ||
1313 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, | |
1314 | int nb_sectors, QEMUIOVector *qiov) | |
1315 | { | |
1316 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
1317 | ||
1318 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov); | |
1319 | } | |
1320 | ||
1321 | /** | |
1322 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
1323 | */ | |
1324 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
1325 | { | |
1326 | BlockDriver *drv = bs->drv; | |
1327 | int ret; | |
1328 | if (!drv) | |
1329 | return -ENOMEDIUM; | |
1330 | if (!drv->bdrv_truncate) | |
1331 | return -ENOTSUP; | |
1332 | if (bs->read_only) | |
1333 | return -EACCES; | |
1334 | if (bdrv_in_use(bs)) | |
1335 | return -EBUSY; | |
1336 | ret = drv->bdrv_truncate(bs, offset); | |
1337 | if (ret == 0) { | |
1338 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
1339 | bdrv_dev_resize_cb(bs); | |
1340 | } | |
1341 | return ret; | |
1342 | } | |
1343 | ||
1344 | /** | |
1345 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
1346 | * allocated space. Return < 0 if error or unknown. | |
1347 | */ | |
1348 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
1349 | { | |
1350 | BlockDriver *drv = bs->drv; | |
1351 | if (!drv) { | |
1352 | return -ENOMEDIUM; | |
1353 | } | |
1354 | if (drv->bdrv_get_allocated_file_size) { | |
1355 | return drv->bdrv_get_allocated_file_size(bs); | |
1356 | } | |
1357 | if (bs->file) { | |
1358 | return bdrv_get_allocated_file_size(bs->file); | |
1359 | } | |
1360 | return -ENOTSUP; | |
1361 | } | |
1362 | ||
1363 | /** | |
1364 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1365 | */ | |
1366 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1367 | { | |
1368 | BlockDriver *drv = bs->drv; | |
1369 | if (!drv) | |
1370 | return -ENOMEDIUM; | |
1371 | ||
1372 | if (bs->growable || bdrv_dev_has_removable_media(bs)) { | |
1373 | if (drv->bdrv_getlength) { | |
1374 | return drv->bdrv_getlength(bs); | |
1375 | } | |
1376 | } | |
1377 | return bs->total_sectors * BDRV_SECTOR_SIZE; | |
1378 | } | |
1379 | ||
1380 | /* return 0 as number of sectors if no device present or error */ | |
1381 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) | |
1382 | { | |
1383 | int64_t length; | |
1384 | length = bdrv_getlength(bs); | |
1385 | if (length < 0) | |
1386 | length = 0; | |
1387 | else | |
1388 | length = length >> BDRV_SECTOR_BITS; | |
1389 | *nb_sectors_ptr = length; | |
1390 | } | |
1391 | ||
1392 | struct partition { | |
1393 | uint8_t boot_ind; /* 0x80 - active */ | |
1394 | uint8_t head; /* starting head */ | |
1395 | uint8_t sector; /* starting sector */ | |
1396 | uint8_t cyl; /* starting cylinder */ | |
1397 | uint8_t sys_ind; /* What partition type */ | |
1398 | uint8_t end_head; /* end head */ | |
1399 | uint8_t end_sector; /* end sector */ | |
1400 | uint8_t end_cyl; /* end cylinder */ | |
1401 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1402 | uint32_t nr_sects; /* nr of sectors in partition */ | |
1403 | } QEMU_PACKED; | |
1404 | ||
1405 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1406 | static int guess_disk_lchs(BlockDriverState *bs, | |
1407 | int *pcylinders, int *pheads, int *psectors) | |
1408 | { | |
1409 | uint8_t buf[BDRV_SECTOR_SIZE]; | |
1410 | int ret, i, heads, sectors, cylinders; | |
1411 | struct partition *p; | |
1412 | uint32_t nr_sects; | |
1413 | uint64_t nb_sectors; | |
1414 | ||
1415 | bdrv_get_geometry(bs, &nb_sectors); | |
1416 | ||
1417 | ret = bdrv_read(bs, 0, buf, 1); | |
1418 | if (ret < 0) | |
1419 | return -1; | |
1420 | /* test msdos magic */ | |
1421 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1422 | return -1; | |
1423 | for(i = 0; i < 4; i++) { | |
1424 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1425 | nr_sects = le32_to_cpu(p->nr_sects); | |
1426 | if (nr_sects && p->end_head) { | |
1427 | /* We make the assumption that the partition terminates on | |
1428 | a cylinder boundary */ | |
1429 | heads = p->end_head + 1; | |
1430 | sectors = p->end_sector & 63; | |
1431 | if (sectors == 0) | |
1432 | continue; | |
1433 | cylinders = nb_sectors / (heads * sectors); | |
1434 | if (cylinders < 1 || cylinders > 16383) | |
1435 | continue; | |
1436 | *pheads = heads; | |
1437 | *psectors = sectors; | |
1438 | *pcylinders = cylinders; | |
1439 | #if 0 | |
1440 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1441 | cylinders, heads, sectors); | |
1442 | #endif | |
1443 | return 0; | |
1444 | } | |
1445 | } | |
1446 | return -1; | |
1447 | } | |
1448 | ||
1449 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1450 | { | |
1451 | int translation, lba_detected = 0; | |
1452 | int cylinders, heads, secs; | |
1453 | uint64_t nb_sectors; | |
1454 | ||
1455 | /* if a geometry hint is available, use it */ | |
1456 | bdrv_get_geometry(bs, &nb_sectors); | |
1457 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1458 | translation = bdrv_get_translation_hint(bs); | |
1459 | if (cylinders != 0) { | |
1460 | *pcyls = cylinders; | |
1461 | *pheads = heads; | |
1462 | *psecs = secs; | |
1463 | } else { | |
1464 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1465 | if (heads > 16) { | |
1466 | /* if heads > 16, it means that a BIOS LBA | |
1467 | translation was active, so the default | |
1468 | hardware geometry is OK */ | |
1469 | lba_detected = 1; | |
1470 | goto default_geometry; | |
1471 | } else { | |
1472 | *pcyls = cylinders; | |
1473 | *pheads = heads; | |
1474 | *psecs = secs; | |
1475 | /* disable any translation to be in sync with | |
1476 | the logical geometry */ | |
1477 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1478 | bdrv_set_translation_hint(bs, | |
1479 | BIOS_ATA_TRANSLATION_NONE); | |
1480 | } | |
1481 | } | |
1482 | } else { | |
1483 | default_geometry: | |
1484 | /* if no geometry, use a standard physical disk geometry */ | |
1485 | cylinders = nb_sectors / (16 * 63); | |
1486 | ||
1487 | if (cylinders > 16383) | |
1488 | cylinders = 16383; | |
1489 | else if (cylinders < 2) | |
1490 | cylinders = 2; | |
1491 | *pcyls = cylinders; | |
1492 | *pheads = 16; | |
1493 | *psecs = 63; | |
1494 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1495 | if ((*pcyls * *pheads) <= 131072) { | |
1496 | bdrv_set_translation_hint(bs, | |
1497 | BIOS_ATA_TRANSLATION_LARGE); | |
1498 | } else { | |
1499 | bdrv_set_translation_hint(bs, | |
1500 | BIOS_ATA_TRANSLATION_LBA); | |
1501 | } | |
1502 | } | |
1503 | } | |
1504 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1505 | } | |
1506 | } | |
1507 | ||
1508 | void bdrv_set_geometry_hint(BlockDriverState *bs, | |
1509 | int cyls, int heads, int secs) | |
1510 | { | |
1511 | bs->cyls = cyls; | |
1512 | bs->heads = heads; | |
1513 | bs->secs = secs; | |
1514 | } | |
1515 | ||
1516 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) | |
1517 | { | |
1518 | bs->translation = translation; | |
1519 | } | |
1520 | ||
1521 | void bdrv_get_geometry_hint(BlockDriverState *bs, | |
1522 | int *pcyls, int *pheads, int *psecs) | |
1523 | { | |
1524 | *pcyls = bs->cyls; | |
1525 | *pheads = bs->heads; | |
1526 | *psecs = bs->secs; | |
1527 | } | |
1528 | ||
1529 | /* Recognize floppy formats */ | |
1530 | typedef struct FDFormat { | |
1531 | FDriveType drive; | |
1532 | uint8_t last_sect; | |
1533 | uint8_t max_track; | |
1534 | uint8_t max_head; | |
1535 | } FDFormat; | |
1536 | ||
1537 | static const FDFormat fd_formats[] = { | |
1538 | /* First entry is default format */ | |
1539 | /* 1.44 MB 3"1/2 floppy disks */ | |
1540 | { FDRIVE_DRV_144, 18, 80, 1, }, | |
1541 | { FDRIVE_DRV_144, 20, 80, 1, }, | |
1542 | { FDRIVE_DRV_144, 21, 80, 1, }, | |
1543 | { FDRIVE_DRV_144, 21, 82, 1, }, | |
1544 | { FDRIVE_DRV_144, 21, 83, 1, }, | |
1545 | { FDRIVE_DRV_144, 22, 80, 1, }, | |
1546 | { FDRIVE_DRV_144, 23, 80, 1, }, | |
1547 | { FDRIVE_DRV_144, 24, 80, 1, }, | |
1548 | /* 2.88 MB 3"1/2 floppy disks */ | |
1549 | { FDRIVE_DRV_288, 36, 80, 1, }, | |
1550 | { FDRIVE_DRV_288, 39, 80, 1, }, | |
1551 | { FDRIVE_DRV_288, 40, 80, 1, }, | |
1552 | { FDRIVE_DRV_288, 44, 80, 1, }, | |
1553 | { FDRIVE_DRV_288, 48, 80, 1, }, | |
1554 | /* 720 kB 3"1/2 floppy disks */ | |
1555 | { FDRIVE_DRV_144, 9, 80, 1, }, | |
1556 | { FDRIVE_DRV_144, 10, 80, 1, }, | |
1557 | { FDRIVE_DRV_144, 10, 82, 1, }, | |
1558 | { FDRIVE_DRV_144, 10, 83, 1, }, | |
1559 | { FDRIVE_DRV_144, 13, 80, 1, }, | |
1560 | { FDRIVE_DRV_144, 14, 80, 1, }, | |
1561 | /* 1.2 MB 5"1/4 floppy disks */ | |
1562 | { FDRIVE_DRV_120, 15, 80, 1, }, | |
1563 | { FDRIVE_DRV_120, 18, 80, 1, }, | |
1564 | { FDRIVE_DRV_120, 18, 82, 1, }, | |
1565 | { FDRIVE_DRV_120, 18, 83, 1, }, | |
1566 | { FDRIVE_DRV_120, 20, 80, 1, }, | |
1567 | /* 720 kB 5"1/4 floppy disks */ | |
1568 | { FDRIVE_DRV_120, 9, 80, 1, }, | |
1569 | { FDRIVE_DRV_120, 11, 80, 1, }, | |
1570 | /* 360 kB 5"1/4 floppy disks */ | |
1571 | { FDRIVE_DRV_120, 9, 40, 1, }, | |
1572 | { FDRIVE_DRV_120, 9, 40, 0, }, | |
1573 | { FDRIVE_DRV_120, 10, 41, 1, }, | |
1574 | { FDRIVE_DRV_120, 10, 42, 1, }, | |
1575 | /* 320 kB 5"1/4 floppy disks */ | |
1576 | { FDRIVE_DRV_120, 8, 40, 1, }, | |
1577 | { FDRIVE_DRV_120, 8, 40, 0, }, | |
1578 | /* 360 kB must match 5"1/4 better than 3"1/2... */ | |
1579 | { FDRIVE_DRV_144, 9, 80, 0, }, | |
1580 | /* end */ | |
1581 | { FDRIVE_DRV_NONE, -1, -1, 0, }, | |
1582 | }; | |
1583 | ||
1584 | void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, | |
1585 | int *max_track, int *last_sect, | |
1586 | FDriveType drive_in, FDriveType *drive) | |
1587 | { | |
1588 | const FDFormat *parse; | |
1589 | uint64_t nb_sectors, size; | |
1590 | int i, first_match, match; | |
1591 | ||
1592 | bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); | |
1593 | if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { | |
1594 | /* User defined disk */ | |
1595 | } else { | |
1596 | bdrv_get_geometry(bs, &nb_sectors); | |
1597 | match = -1; | |
1598 | first_match = -1; | |
1599 | for (i = 0; ; i++) { | |
1600 | parse = &fd_formats[i]; | |
1601 | if (parse->drive == FDRIVE_DRV_NONE) { | |
1602 | break; | |
1603 | } | |
1604 | if (drive_in == parse->drive || | |
1605 | drive_in == FDRIVE_DRV_NONE) { | |
1606 | size = (parse->max_head + 1) * parse->max_track * | |
1607 | parse->last_sect; | |
1608 | if (nb_sectors == size) { | |
1609 | match = i; | |
1610 | break; | |
1611 | } | |
1612 | if (first_match == -1) { | |
1613 | first_match = i; | |
1614 | } | |
1615 | } | |
1616 | } | |
1617 | if (match == -1) { | |
1618 | if (first_match == -1) { | |
1619 | match = 1; | |
1620 | } else { | |
1621 | match = first_match; | |
1622 | } | |
1623 | parse = &fd_formats[match]; | |
1624 | } | |
1625 | *nb_heads = parse->max_head + 1; | |
1626 | *max_track = parse->max_track; | |
1627 | *last_sect = parse->last_sect; | |
1628 | *drive = parse->drive; | |
1629 | } | |
1630 | } | |
1631 | ||
1632 | int bdrv_get_translation_hint(BlockDriverState *bs) | |
1633 | { | |
1634 | return bs->translation; | |
1635 | } | |
1636 | ||
1637 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, | |
1638 | BlockErrorAction on_write_error) | |
1639 | { | |
1640 | bs->on_read_error = on_read_error; | |
1641 | bs->on_write_error = on_write_error; | |
1642 | } | |
1643 | ||
1644 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
1645 | { | |
1646 | return is_read ? bs->on_read_error : bs->on_write_error; | |
1647 | } | |
1648 | ||
1649 | int bdrv_is_read_only(BlockDriverState *bs) | |
1650 | { | |
1651 | return bs->read_only; | |
1652 | } | |
1653 | ||
1654 | int bdrv_is_sg(BlockDriverState *bs) | |
1655 | { | |
1656 | return bs->sg; | |
1657 | } | |
1658 | ||
1659 | int bdrv_enable_write_cache(BlockDriverState *bs) | |
1660 | { | |
1661 | return bs->enable_write_cache; | |
1662 | } | |
1663 | ||
1664 | int bdrv_is_encrypted(BlockDriverState *bs) | |
1665 | { | |
1666 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1667 | return 1; | |
1668 | return bs->encrypted; | |
1669 | } | |
1670 | ||
1671 | int bdrv_key_required(BlockDriverState *bs) | |
1672 | { | |
1673 | BlockDriverState *backing_hd = bs->backing_hd; | |
1674 | ||
1675 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1676 | return 1; | |
1677 | return (bs->encrypted && !bs->valid_key); | |
1678 | } | |
1679 | ||
1680 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
1681 | { | |
1682 | int ret; | |
1683 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1684 | ret = bdrv_set_key(bs->backing_hd, key); | |
1685 | if (ret < 0) | |
1686 | return ret; | |
1687 | if (!bs->encrypted) | |
1688 | return 0; | |
1689 | } | |
1690 | if (!bs->encrypted) { | |
1691 | return -EINVAL; | |
1692 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1693 | return -ENOMEDIUM; | |
1694 | } | |
1695 | ret = bs->drv->bdrv_set_key(bs, key); | |
1696 | if (ret < 0) { | |
1697 | bs->valid_key = 0; | |
1698 | } else if (!bs->valid_key) { | |
1699 | bs->valid_key = 1; | |
1700 | /* call the change callback now, we skipped it on open */ | |
1701 | bdrv_dev_change_media_cb(bs, true); | |
1702 | } | |
1703 | return ret; | |
1704 | } | |
1705 | ||
1706 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1707 | { | |
1708 | if (!bs->drv) { | |
1709 | buf[0] = '\0'; | |
1710 | } else { | |
1711 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1712 | } | |
1713 | } | |
1714 | ||
1715 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), | |
1716 | void *opaque) | |
1717 | { | |
1718 | BlockDriver *drv; | |
1719 | ||
1720 | QLIST_FOREACH(drv, &bdrv_drivers, list) { | |
1721 | it(opaque, drv->format_name); | |
1722 | } | |
1723 | } | |
1724 | ||
1725 | BlockDriverState *bdrv_find(const char *name) | |
1726 | { | |
1727 | BlockDriverState *bs; | |
1728 | ||
1729 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1730 | if (!strcmp(name, bs->device_name)) { | |
1731 | return bs; | |
1732 | } | |
1733 | } | |
1734 | return NULL; | |
1735 | } | |
1736 | ||
1737 | BlockDriverState *bdrv_next(BlockDriverState *bs) | |
1738 | { | |
1739 | if (!bs) { | |
1740 | return QTAILQ_FIRST(&bdrv_states); | |
1741 | } | |
1742 | return QTAILQ_NEXT(bs, list); | |
1743 | } | |
1744 | ||
1745 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) | |
1746 | { | |
1747 | BlockDriverState *bs; | |
1748 | ||
1749 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1750 | it(opaque, bs); | |
1751 | } | |
1752 | } | |
1753 | ||
1754 | const char *bdrv_get_device_name(BlockDriverState *bs) | |
1755 | { | |
1756 | return bs->device_name; | |
1757 | } | |
1758 | ||
1759 | void bdrv_flush_all(void) | |
1760 | { | |
1761 | BlockDriverState *bs; | |
1762 | ||
1763 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1764 | if (!bdrv_is_read_only(bs) && bdrv_is_inserted(bs)) { | |
1765 | bdrv_flush(bs); | |
1766 | } | |
1767 | } | |
1768 | } | |
1769 | ||
1770 | int bdrv_has_zero_init(BlockDriverState *bs) | |
1771 | { | |
1772 | assert(bs->drv); | |
1773 | ||
1774 | if (bs->drv->bdrv_has_zero_init) { | |
1775 | return bs->drv->bdrv_has_zero_init(bs); | |
1776 | } | |
1777 | ||
1778 | return 1; | |
1779 | } | |
1780 | ||
1781 | /* | |
1782 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1783 | * not implementing the functionality are assumed to not support backing files, | |
1784 | * hence all their sectors are reported as allocated. | |
1785 | * | |
1786 | * 'pnum' is set to the number of sectors (including and immediately following | |
1787 | * the specified sector) that are known to be in the same | |
1788 | * allocated/unallocated state. | |
1789 | * | |
1790 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1791 | */ | |
1792 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1793 | int *pnum) | |
1794 | { | |
1795 | int64_t n; | |
1796 | if (!bs->drv->bdrv_is_allocated) { | |
1797 | if (sector_num >= bs->total_sectors) { | |
1798 | *pnum = 0; | |
1799 | return 0; | |
1800 | } | |
1801 | n = bs->total_sectors - sector_num; | |
1802 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1803 | return 1; | |
1804 | } | |
1805 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1806 | } | |
1807 | ||
1808 | void bdrv_mon_event(const BlockDriverState *bdrv, | |
1809 | BlockMonEventAction action, int is_read) | |
1810 | { | |
1811 | QObject *data; | |
1812 | const char *action_str; | |
1813 | ||
1814 | switch (action) { | |
1815 | case BDRV_ACTION_REPORT: | |
1816 | action_str = "report"; | |
1817 | break; | |
1818 | case BDRV_ACTION_IGNORE: | |
1819 | action_str = "ignore"; | |
1820 | break; | |
1821 | case BDRV_ACTION_STOP: | |
1822 | action_str = "stop"; | |
1823 | break; | |
1824 | default: | |
1825 | abort(); | |
1826 | } | |
1827 | ||
1828 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1829 | bdrv->device_name, | |
1830 | action_str, | |
1831 | is_read ? "read" : "write"); | |
1832 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1833 | ||
1834 | qobject_decref(data); | |
1835 | } | |
1836 | ||
1837 | BlockInfoList *qmp_query_block(Error **errp) | |
1838 | { | |
1839 | BlockInfoList *head = NULL, *cur_item = NULL; | |
1840 | BlockDriverState *bs; | |
1841 | ||
1842 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1843 | BlockInfoList *info = g_malloc0(sizeof(*info)); | |
1844 | ||
1845 | info->value = g_malloc0(sizeof(*info->value)); | |
1846 | info->value->device = g_strdup(bs->device_name); | |
1847 | info->value->type = g_strdup("unknown"); | |
1848 | info->value->locked = bdrv_dev_is_medium_locked(bs); | |
1849 | info->value->removable = bdrv_dev_has_removable_media(bs); | |
1850 | ||
1851 | if (bdrv_dev_has_removable_media(bs)) { | |
1852 | info->value->has_tray_open = true; | |
1853 | info->value->tray_open = bdrv_dev_is_tray_open(bs); | |
1854 | } | |
1855 | ||
1856 | if (bdrv_iostatus_is_enabled(bs)) { | |
1857 | info->value->has_io_status = true; | |
1858 | info->value->io_status = bs->iostatus; | |
1859 | } | |
1860 | ||
1861 | if (bs->drv) { | |
1862 | info->value->has_inserted = true; | |
1863 | info->value->inserted = g_malloc0(sizeof(*info->value->inserted)); | |
1864 | info->value->inserted->file = g_strdup(bs->filename); | |
1865 | info->value->inserted->ro = bs->read_only; | |
1866 | info->value->inserted->drv = g_strdup(bs->drv->format_name); | |
1867 | info->value->inserted->encrypted = bs->encrypted; | |
1868 | if (bs->backing_file[0]) { | |
1869 | info->value->inserted->has_backing_file = true; | |
1870 | info->value->inserted->backing_file = g_strdup(bs->backing_file); | |
1871 | } | |
1872 | } | |
1873 | ||
1874 | /* XXX: waiting for the qapi to support GSList */ | |
1875 | if (!cur_item) { | |
1876 | head = cur_item = info; | |
1877 | } else { | |
1878 | cur_item->next = info; | |
1879 | cur_item = info; | |
1880 | } | |
1881 | } | |
1882 | ||
1883 | return head; | |
1884 | } | |
1885 | ||
1886 | /* Consider exposing this as a full fledged QMP command */ | |
1887 | static BlockStats *qmp_query_blockstat(const BlockDriverState *bs, Error **errp) | |
1888 | { | |
1889 | BlockStats *s; | |
1890 | ||
1891 | s = g_malloc0(sizeof(*s)); | |
1892 | ||
1893 | if (bs->device_name[0]) { | |
1894 | s->has_device = true; | |
1895 | s->device = g_strdup(bs->device_name); | |
1896 | } | |
1897 | ||
1898 | s->stats = g_malloc0(sizeof(*s->stats)); | |
1899 | s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; | |
1900 | s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; | |
1901 | s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; | |
1902 | s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; | |
1903 | s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; | |
1904 | s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; | |
1905 | s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; | |
1906 | s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; | |
1907 | s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; | |
1908 | ||
1909 | if (bs->file) { | |
1910 | s->has_parent = true; | |
1911 | s->parent = qmp_query_blockstat(bs->file, NULL); | |
1912 | } | |
1913 | ||
1914 | return s; | |
1915 | } | |
1916 | ||
1917 | BlockStatsList *qmp_query_blockstats(Error **errp) | |
1918 | { | |
1919 | BlockStatsList *head = NULL, *cur_item = NULL; | |
1920 | BlockDriverState *bs; | |
1921 | ||
1922 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1923 | BlockStatsList *info = g_malloc0(sizeof(*info)); | |
1924 | info->value = qmp_query_blockstat(bs, NULL); | |
1925 | ||
1926 | /* XXX: waiting for the qapi to support GSList */ | |
1927 | if (!cur_item) { | |
1928 | head = cur_item = info; | |
1929 | } else { | |
1930 | cur_item->next = info; | |
1931 | cur_item = info; | |
1932 | } | |
1933 | } | |
1934 | ||
1935 | return head; | |
1936 | } | |
1937 | ||
1938 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) | |
1939 | { | |
1940 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1941 | return bs->backing_file; | |
1942 | else if (bs->encrypted) | |
1943 | return bs->filename; | |
1944 | else | |
1945 | return NULL; | |
1946 | } | |
1947 | ||
1948 | void bdrv_get_backing_filename(BlockDriverState *bs, | |
1949 | char *filename, int filename_size) | |
1950 | { | |
1951 | pstrcpy(filename, filename_size, bs->backing_file); | |
1952 | } | |
1953 | ||
1954 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, | |
1955 | const uint8_t *buf, int nb_sectors) | |
1956 | { | |
1957 | BlockDriver *drv = bs->drv; | |
1958 | if (!drv) | |
1959 | return -ENOMEDIUM; | |
1960 | if (!drv->bdrv_write_compressed) | |
1961 | return -ENOTSUP; | |
1962 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
1963 | return -EIO; | |
1964 | ||
1965 | if (bs->dirty_bitmap) { | |
1966 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1967 | } | |
1968 | ||
1969 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); | |
1970 | } | |
1971 | ||
1972 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
1973 | { | |
1974 | BlockDriver *drv = bs->drv; | |
1975 | if (!drv) | |
1976 | return -ENOMEDIUM; | |
1977 | if (!drv->bdrv_get_info) | |
1978 | return -ENOTSUP; | |
1979 | memset(bdi, 0, sizeof(*bdi)); | |
1980 | return drv->bdrv_get_info(bs, bdi); | |
1981 | } | |
1982 | ||
1983 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, | |
1984 | int64_t pos, int size) | |
1985 | { | |
1986 | BlockDriver *drv = bs->drv; | |
1987 | if (!drv) | |
1988 | return -ENOMEDIUM; | |
1989 | if (drv->bdrv_save_vmstate) | |
1990 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
1991 | if (bs->file) | |
1992 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
1993 | return -ENOTSUP; | |
1994 | } | |
1995 | ||
1996 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, | |
1997 | int64_t pos, int size) | |
1998 | { | |
1999 | BlockDriver *drv = bs->drv; | |
2000 | if (!drv) | |
2001 | return -ENOMEDIUM; | |
2002 | if (drv->bdrv_load_vmstate) | |
2003 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
2004 | if (bs->file) | |
2005 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
2006 | return -ENOTSUP; | |
2007 | } | |
2008 | ||
2009 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) | |
2010 | { | |
2011 | BlockDriver *drv = bs->drv; | |
2012 | ||
2013 | if (!drv || !drv->bdrv_debug_event) { | |
2014 | return; | |
2015 | } | |
2016 | ||
2017 | return drv->bdrv_debug_event(bs, event); | |
2018 | ||
2019 | } | |
2020 | ||
2021 | /**************************************************************/ | |
2022 | /* handling of snapshots */ | |
2023 | ||
2024 | int bdrv_can_snapshot(BlockDriverState *bs) | |
2025 | { | |
2026 | BlockDriver *drv = bs->drv; | |
2027 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { | |
2028 | return 0; | |
2029 | } | |
2030 | ||
2031 | if (!drv->bdrv_snapshot_create) { | |
2032 | if (bs->file != NULL) { | |
2033 | return bdrv_can_snapshot(bs->file); | |
2034 | } | |
2035 | return 0; | |
2036 | } | |
2037 | ||
2038 | return 1; | |
2039 | } | |
2040 | ||
2041 | int bdrv_is_snapshot(BlockDriverState *bs) | |
2042 | { | |
2043 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
2044 | } | |
2045 | ||
2046 | BlockDriverState *bdrv_snapshots(void) | |
2047 | { | |
2048 | BlockDriverState *bs; | |
2049 | ||
2050 | if (bs_snapshots) { | |
2051 | return bs_snapshots; | |
2052 | } | |
2053 | ||
2054 | bs = NULL; | |
2055 | while ((bs = bdrv_next(bs))) { | |
2056 | if (bdrv_can_snapshot(bs)) { | |
2057 | bs_snapshots = bs; | |
2058 | return bs; | |
2059 | } | |
2060 | } | |
2061 | return NULL; | |
2062 | } | |
2063 | ||
2064 | int bdrv_snapshot_create(BlockDriverState *bs, | |
2065 | QEMUSnapshotInfo *sn_info) | |
2066 | { | |
2067 | BlockDriver *drv = bs->drv; | |
2068 | if (!drv) | |
2069 | return -ENOMEDIUM; | |
2070 | if (drv->bdrv_snapshot_create) | |
2071 | return drv->bdrv_snapshot_create(bs, sn_info); | |
2072 | if (bs->file) | |
2073 | return bdrv_snapshot_create(bs->file, sn_info); | |
2074 | return -ENOTSUP; | |
2075 | } | |
2076 | ||
2077 | int bdrv_snapshot_goto(BlockDriverState *bs, | |
2078 | const char *snapshot_id) | |
2079 | { | |
2080 | BlockDriver *drv = bs->drv; | |
2081 | int ret, open_ret; | |
2082 | ||
2083 | if (!drv) | |
2084 | return -ENOMEDIUM; | |
2085 | if (drv->bdrv_snapshot_goto) | |
2086 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
2087 | ||
2088 | if (bs->file) { | |
2089 | drv->bdrv_close(bs); | |
2090 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
2091 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
2092 | if (open_ret < 0) { | |
2093 | bdrv_delete(bs->file); | |
2094 | bs->drv = NULL; | |
2095 | return open_ret; | |
2096 | } | |
2097 | return ret; | |
2098 | } | |
2099 | ||
2100 | return -ENOTSUP; | |
2101 | } | |
2102 | ||
2103 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2104 | { | |
2105 | BlockDriver *drv = bs->drv; | |
2106 | if (!drv) | |
2107 | return -ENOMEDIUM; | |
2108 | if (drv->bdrv_snapshot_delete) | |
2109 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
2110 | if (bs->file) | |
2111 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
2112 | return -ENOTSUP; | |
2113 | } | |
2114 | ||
2115 | int bdrv_snapshot_list(BlockDriverState *bs, | |
2116 | QEMUSnapshotInfo **psn_info) | |
2117 | { | |
2118 | BlockDriver *drv = bs->drv; | |
2119 | if (!drv) | |
2120 | return -ENOMEDIUM; | |
2121 | if (drv->bdrv_snapshot_list) | |
2122 | return drv->bdrv_snapshot_list(bs, psn_info); | |
2123 | if (bs->file) | |
2124 | return bdrv_snapshot_list(bs->file, psn_info); | |
2125 | return -ENOTSUP; | |
2126 | } | |
2127 | ||
2128 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, | |
2129 | const char *snapshot_name) | |
2130 | { | |
2131 | BlockDriver *drv = bs->drv; | |
2132 | if (!drv) { | |
2133 | return -ENOMEDIUM; | |
2134 | } | |
2135 | if (!bs->read_only) { | |
2136 | return -EINVAL; | |
2137 | } | |
2138 | if (drv->bdrv_snapshot_load_tmp) { | |
2139 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
2140 | } | |
2141 | return -ENOTSUP; | |
2142 | } | |
2143 | ||
2144 | #define NB_SUFFIXES 4 | |
2145 | ||
2146 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
2147 | { | |
2148 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
2149 | int64_t base; | |
2150 | int i; | |
2151 | ||
2152 | if (size <= 999) { | |
2153 | snprintf(buf, buf_size, "%" PRId64, size); | |
2154 | } else { | |
2155 | base = 1024; | |
2156 | for(i = 0; i < NB_SUFFIXES; i++) { | |
2157 | if (size < (10 * base)) { | |
2158 | snprintf(buf, buf_size, "%0.1f%c", | |
2159 | (double)size / base, | |
2160 | suffixes[i]); | |
2161 | break; | |
2162 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
2163 | snprintf(buf, buf_size, "%" PRId64 "%c", | |
2164 | ((size + (base >> 1)) / base), | |
2165 | suffixes[i]); | |
2166 | break; | |
2167 | } | |
2168 | base = base * 1024; | |
2169 | } | |
2170 | } | |
2171 | return buf; | |
2172 | } | |
2173 | ||
2174 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
2175 | { | |
2176 | char buf1[128], date_buf[128], clock_buf[128]; | |
2177 | #ifdef _WIN32 | |
2178 | struct tm *ptm; | |
2179 | #else | |
2180 | struct tm tm; | |
2181 | #endif | |
2182 | time_t ti; | |
2183 | int64_t secs; | |
2184 | ||
2185 | if (!sn) { | |
2186 | snprintf(buf, buf_size, | |
2187 | "%-10s%-20s%7s%20s%15s", | |
2188 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); | |
2189 | } else { | |
2190 | ti = sn->date_sec; | |
2191 | #ifdef _WIN32 | |
2192 | ptm = localtime(&ti); | |
2193 | strftime(date_buf, sizeof(date_buf), | |
2194 | "%Y-%m-%d %H:%M:%S", ptm); | |
2195 | #else | |
2196 | localtime_r(&ti, &tm); | |
2197 | strftime(date_buf, sizeof(date_buf), | |
2198 | "%Y-%m-%d %H:%M:%S", &tm); | |
2199 | #endif | |
2200 | secs = sn->vm_clock_nsec / 1000000000; | |
2201 | snprintf(clock_buf, sizeof(clock_buf), | |
2202 | "%02d:%02d:%02d.%03d", | |
2203 | (int)(secs / 3600), | |
2204 | (int)((secs / 60) % 60), | |
2205 | (int)(secs % 60), | |
2206 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); | |
2207 | snprintf(buf, buf_size, | |
2208 | "%-10s%-20s%7s%20s%15s", | |
2209 | sn->id_str, sn->name, | |
2210 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
2211 | date_buf, | |
2212 | clock_buf); | |
2213 | } | |
2214 | return buf; | |
2215 | } | |
2216 | ||
2217 | /**************************************************************/ | |
2218 | /* async I/Os */ | |
2219 | ||
2220 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, | |
2221 | QEMUIOVector *qiov, int nb_sectors, | |
2222 | BlockDriverCompletionFunc *cb, void *opaque) | |
2223 | { | |
2224 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); | |
2225 | ||
2226 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, | |
2227 | cb, opaque, false); | |
2228 | } | |
2229 | ||
2230 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, | |
2231 | QEMUIOVector *qiov, int nb_sectors, | |
2232 | BlockDriverCompletionFunc *cb, void *opaque) | |
2233 | { | |
2234 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); | |
2235 | ||
2236 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, | |
2237 | cb, opaque, true); | |
2238 | } | |
2239 | ||
2240 | ||
2241 | typedef struct MultiwriteCB { | |
2242 | int error; | |
2243 | int num_requests; | |
2244 | int num_callbacks; | |
2245 | struct { | |
2246 | BlockDriverCompletionFunc *cb; | |
2247 | void *opaque; | |
2248 | QEMUIOVector *free_qiov; | |
2249 | void *free_buf; | |
2250 | } callbacks[]; | |
2251 | } MultiwriteCB; | |
2252 | ||
2253 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
2254 | { | |
2255 | int i; | |
2256 | ||
2257 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2258 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
2259 | if (mcb->callbacks[i].free_qiov) { | |
2260 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
2261 | } | |
2262 | g_free(mcb->callbacks[i].free_qiov); | |
2263 | qemu_vfree(mcb->callbacks[i].free_buf); | |
2264 | } | |
2265 | } | |
2266 | ||
2267 | static void multiwrite_cb(void *opaque, int ret) | |
2268 | { | |
2269 | MultiwriteCB *mcb = opaque; | |
2270 | ||
2271 | trace_multiwrite_cb(mcb, ret); | |
2272 | ||
2273 | if (ret < 0 && !mcb->error) { | |
2274 | mcb->error = ret; | |
2275 | } | |
2276 | ||
2277 | mcb->num_requests--; | |
2278 | if (mcb->num_requests == 0) { | |
2279 | multiwrite_user_cb(mcb); | |
2280 | g_free(mcb); | |
2281 | } | |
2282 | } | |
2283 | ||
2284 | static int multiwrite_req_compare(const void *a, const void *b) | |
2285 | { | |
2286 | const BlockRequest *req1 = a, *req2 = b; | |
2287 | ||
2288 | /* | |
2289 | * Note that we can't simply subtract req2->sector from req1->sector | |
2290 | * here as that could overflow the return value. | |
2291 | */ | |
2292 | if (req1->sector > req2->sector) { | |
2293 | return 1; | |
2294 | } else if (req1->sector < req2->sector) { | |
2295 | return -1; | |
2296 | } else { | |
2297 | return 0; | |
2298 | } | |
2299 | } | |
2300 | ||
2301 | /* | |
2302 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
2303 | * requests that remain after merging. | |
2304 | */ | |
2305 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
2306 | int num_reqs, MultiwriteCB *mcb) | |
2307 | { | |
2308 | int i, outidx; | |
2309 | ||
2310 | // Sort requests by start sector | |
2311 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
2312 | ||
2313 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
2314 | // filling up gaps with zero sectors. | |
2315 | outidx = 0; | |
2316 | for (i = 1; i < num_reqs; i++) { | |
2317 | int merge = 0; | |
2318 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
2319 | ||
2320 | // This handles the cases that are valid for all block drivers, namely | |
2321 | // exactly sequential writes and overlapping writes. | |
2322 | if (reqs[i].sector <= oldreq_last) { | |
2323 | merge = 1; | |
2324 | } | |
2325 | ||
2326 | // The block driver may decide that it makes sense to combine requests | |
2327 | // even if there is a gap of some sectors between them. In this case, | |
2328 | // the gap is filled with zeros (therefore only applicable for yet | |
2329 | // unused space in format like qcow2). | |
2330 | if (!merge && bs->drv->bdrv_merge_requests) { | |
2331 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
2332 | } | |
2333 | ||
2334 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { | |
2335 | merge = 0; | |
2336 | } | |
2337 | ||
2338 | if (merge) { | |
2339 | size_t size; | |
2340 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); | |
2341 | qemu_iovec_init(qiov, | |
2342 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
2343 | ||
2344 | // Add the first request to the merged one. If the requests are | |
2345 | // overlapping, drop the last sectors of the first request. | |
2346 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
2347 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
2348 | ||
2349 | // We might need to add some zeros between the two requests | |
2350 | if (reqs[i].sector > oldreq_last) { | |
2351 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
2352 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
2353 | memset(buf, 0, zero_bytes); | |
2354 | qemu_iovec_add(qiov, buf, zero_bytes); | |
2355 | mcb->callbacks[i].free_buf = buf; | |
2356 | } | |
2357 | ||
2358 | // Add the second request | |
2359 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2360 | ||
2361 | reqs[outidx].nb_sectors = qiov->size >> 9; | |
2362 | reqs[outidx].qiov = qiov; | |
2363 | ||
2364 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2365 | } else { | |
2366 | outidx++; | |
2367 | reqs[outidx].sector = reqs[i].sector; | |
2368 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2369 | reqs[outidx].qiov = reqs[i].qiov; | |
2370 | } | |
2371 | } | |
2372 | ||
2373 | return outidx + 1; | |
2374 | } | |
2375 | ||
2376 | /* | |
2377 | * Submit multiple AIO write requests at once. | |
2378 | * | |
2379 | * On success, the function returns 0 and all requests in the reqs array have | |
2380 | * been submitted. In error case this function returns -1, and any of the | |
2381 | * requests may or may not be submitted yet. In particular, this means that the | |
2382 | * callback will be called for some of the requests, for others it won't. The | |
2383 | * caller must check the error field of the BlockRequest to wait for the right | |
2384 | * callbacks (if error != 0, no callback will be called). | |
2385 | * | |
2386 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2387 | * requests. However, the fields opaque and error are left unmodified as they | |
2388 | * are used to signal failure for a single request to the caller. | |
2389 | */ | |
2390 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2391 | { | |
2392 | BlockDriverAIOCB *acb; | |
2393 | MultiwriteCB *mcb; | |
2394 | int i; | |
2395 | ||
2396 | /* don't submit writes if we don't have a medium */ | |
2397 | if (bs->drv == NULL) { | |
2398 | for (i = 0; i < num_reqs; i++) { | |
2399 | reqs[i].error = -ENOMEDIUM; | |
2400 | } | |
2401 | return -1; | |
2402 | } | |
2403 | ||
2404 | if (num_reqs == 0) { | |
2405 | return 0; | |
2406 | } | |
2407 | ||
2408 | // Create MultiwriteCB structure | |
2409 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
2410 | mcb->num_requests = 0; | |
2411 | mcb->num_callbacks = num_reqs; | |
2412 | ||
2413 | for (i = 0; i < num_reqs; i++) { | |
2414 | mcb->callbacks[i].cb = reqs[i].cb; | |
2415 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2416 | } | |
2417 | ||
2418 | // Check for mergable requests | |
2419 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2420 | ||
2421 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); | |
2422 | ||
2423 | /* | |
2424 | * Run the aio requests. As soon as one request can't be submitted | |
2425 | * successfully, fail all requests that are not yet submitted (we must | |
2426 | * return failure for all requests anyway) | |
2427 | * | |
2428 | * num_requests cannot be set to the right value immediately: If | |
2429 | * bdrv_aio_writev fails for some request, num_requests would be too high | |
2430 | * and therefore multiwrite_cb() would never recognize the multiwrite | |
2431 | * request as completed. We also cannot use the loop variable i to set it | |
2432 | * when the first request fails because the callback may already have been | |
2433 | * called for previously submitted requests. Thus, num_requests must be | |
2434 | * incremented for each request that is submitted. | |
2435 | * | |
2436 | * The problem that callbacks may be called early also means that we need | |
2437 | * to take care that num_requests doesn't become 0 before all requests are | |
2438 | * submitted - multiwrite_cb() would consider the multiwrite request | |
2439 | * completed. A dummy request that is "completed" by a manual call to | |
2440 | * multiwrite_cb() takes care of this. | |
2441 | */ | |
2442 | mcb->num_requests = 1; | |
2443 | ||
2444 | // Run the aio requests | |
2445 | for (i = 0; i < num_reqs; i++) { | |
2446 | mcb->num_requests++; | |
2447 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
2448 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2449 | ||
2450 | if (acb == NULL) { | |
2451 | // We can only fail the whole thing if no request has been | |
2452 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2453 | // complete and report the error in the callback. | |
2454 | if (i == 0) { | |
2455 | trace_bdrv_aio_multiwrite_earlyfail(mcb); | |
2456 | goto fail; | |
2457 | } else { | |
2458 | trace_bdrv_aio_multiwrite_latefail(mcb, i); | |
2459 | multiwrite_cb(mcb, -EIO); | |
2460 | break; | |
2461 | } | |
2462 | } | |
2463 | } | |
2464 | ||
2465 | /* Complete the dummy request */ | |
2466 | multiwrite_cb(mcb, 0); | |
2467 | ||
2468 | return 0; | |
2469 | ||
2470 | fail: | |
2471 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2472 | reqs[i].error = -EIO; | |
2473 | } | |
2474 | g_free(mcb); | |
2475 | return -1; | |
2476 | } | |
2477 | ||
2478 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
2479 | { | |
2480 | acb->pool->cancel(acb); | |
2481 | } | |
2482 | ||
2483 | ||
2484 | /**************************************************************/ | |
2485 | /* async block device emulation */ | |
2486 | ||
2487 | typedef struct BlockDriverAIOCBSync { | |
2488 | BlockDriverAIOCB common; | |
2489 | QEMUBH *bh; | |
2490 | int ret; | |
2491 | /* vector translation state */ | |
2492 | QEMUIOVector *qiov; | |
2493 | uint8_t *bounce; | |
2494 | int is_write; | |
2495 | } BlockDriverAIOCBSync; | |
2496 | ||
2497 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2498 | { | |
2499 | BlockDriverAIOCBSync *acb = | |
2500 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
2501 | qemu_bh_delete(acb->bh); | |
2502 | acb->bh = NULL; | |
2503 | qemu_aio_release(acb); | |
2504 | } | |
2505 | ||
2506 | static AIOPool bdrv_em_aio_pool = { | |
2507 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2508 | .cancel = bdrv_aio_cancel_em, | |
2509 | }; | |
2510 | ||
2511 | static void bdrv_aio_bh_cb(void *opaque) | |
2512 | { | |
2513 | BlockDriverAIOCBSync *acb = opaque; | |
2514 | ||
2515 | if (!acb->is_write) | |
2516 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
2517 | qemu_vfree(acb->bounce); | |
2518 | acb->common.cb(acb->common.opaque, acb->ret); | |
2519 | qemu_bh_delete(acb->bh); | |
2520 | acb->bh = NULL; | |
2521 | qemu_aio_release(acb); | |
2522 | } | |
2523 | ||
2524 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, | |
2525 | int64_t sector_num, | |
2526 | QEMUIOVector *qiov, | |
2527 | int nb_sectors, | |
2528 | BlockDriverCompletionFunc *cb, | |
2529 | void *opaque, | |
2530 | int is_write) | |
2531 | ||
2532 | { | |
2533 | BlockDriverAIOCBSync *acb; | |
2534 | ||
2535 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2536 | acb->is_write = is_write; | |
2537 | acb->qiov = qiov; | |
2538 | acb->bounce = qemu_blockalign(bs, qiov->size); | |
2539 | ||
2540 | if (!acb->bh) | |
2541 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2542 | ||
2543 | if (is_write) { | |
2544 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
2545 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
2546 | } else { | |
2547 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
2548 | } | |
2549 | ||
2550 | qemu_bh_schedule(acb->bh); | |
2551 | ||
2552 | return &acb->common; | |
2553 | } | |
2554 | ||
2555 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, | |
2556 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2557 | BlockDriverCompletionFunc *cb, void *opaque) | |
2558 | { | |
2559 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); | |
2560 | } | |
2561 | ||
2562 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, | |
2563 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2564 | BlockDriverCompletionFunc *cb, void *opaque) | |
2565 | { | |
2566 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
2567 | } | |
2568 | ||
2569 | ||
2570 | typedef struct BlockDriverAIOCBCoroutine { | |
2571 | BlockDriverAIOCB common; | |
2572 | BlockRequest req; | |
2573 | bool is_write; | |
2574 | QEMUBH* bh; | |
2575 | } BlockDriverAIOCBCoroutine; | |
2576 | ||
2577 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
2578 | { | |
2579 | qemu_aio_flush(); | |
2580 | } | |
2581 | ||
2582 | static AIOPool bdrv_em_co_aio_pool = { | |
2583 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), | |
2584 | .cancel = bdrv_aio_co_cancel_em, | |
2585 | }; | |
2586 | ||
2587 | static void bdrv_co_em_bh(void *opaque) | |
2588 | { | |
2589 | BlockDriverAIOCBCoroutine *acb = opaque; | |
2590 | ||
2591 | acb->common.cb(acb->common.opaque, acb->req.error); | |
2592 | qemu_bh_delete(acb->bh); | |
2593 | qemu_aio_release(acb); | |
2594 | } | |
2595 | ||
2596 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ | |
2597 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
2598 | { | |
2599 | BlockDriverAIOCBCoroutine *acb = opaque; | |
2600 | BlockDriverState *bs = acb->common.bs; | |
2601 | ||
2602 | if (!acb->is_write) { | |
2603 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
2604 | acb->req.nb_sectors, acb->req.qiov); | |
2605 | } else { | |
2606 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
2607 | acb->req.nb_sectors, acb->req.qiov); | |
2608 | } | |
2609 | ||
2610 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
2611 | qemu_bh_schedule(acb->bh); | |
2612 | } | |
2613 | ||
2614 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, | |
2615 | int64_t sector_num, | |
2616 | QEMUIOVector *qiov, | |
2617 | int nb_sectors, | |
2618 | BlockDriverCompletionFunc *cb, | |
2619 | void *opaque, | |
2620 | bool is_write) | |
2621 | { | |
2622 | Coroutine *co; | |
2623 | BlockDriverAIOCBCoroutine *acb; | |
2624 | ||
2625 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
2626 | acb->req.sector = sector_num; | |
2627 | acb->req.nb_sectors = nb_sectors; | |
2628 | acb->req.qiov = qiov; | |
2629 | acb->is_write = is_write; | |
2630 | ||
2631 | co = qemu_coroutine_create(bdrv_co_do_rw); | |
2632 | qemu_coroutine_enter(co, acb); | |
2633 | ||
2634 | return &acb->common; | |
2635 | } | |
2636 | ||
2637 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) | |
2638 | { | |
2639 | BlockDriverAIOCBCoroutine *acb = opaque; | |
2640 | BlockDriverState *bs = acb->common.bs; | |
2641 | ||
2642 | acb->req.error = bdrv_co_flush(bs); | |
2643 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
2644 | qemu_bh_schedule(acb->bh); | |
2645 | } | |
2646 | ||
2647 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, | |
2648 | BlockDriverCompletionFunc *cb, void *opaque) | |
2649 | { | |
2650 | trace_bdrv_aio_flush(bs, opaque); | |
2651 | ||
2652 | Coroutine *co; | |
2653 | BlockDriverAIOCBCoroutine *acb; | |
2654 | ||
2655 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
2656 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); | |
2657 | qemu_coroutine_enter(co, acb); | |
2658 | ||
2659 | return &acb->common; | |
2660 | } | |
2661 | ||
2662 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) | |
2663 | { | |
2664 | BlockDriverAIOCBCoroutine *acb = opaque; | |
2665 | BlockDriverState *bs = acb->common.bs; | |
2666 | ||
2667 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
2668 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
2669 | qemu_bh_schedule(acb->bh); | |
2670 | } | |
2671 | ||
2672 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
2673 | int64_t sector_num, int nb_sectors, | |
2674 | BlockDriverCompletionFunc *cb, void *opaque) | |
2675 | { | |
2676 | Coroutine *co; | |
2677 | BlockDriverAIOCBCoroutine *acb; | |
2678 | ||
2679 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
2680 | ||
2681 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
2682 | acb->req.sector = sector_num; | |
2683 | acb->req.nb_sectors = nb_sectors; | |
2684 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); | |
2685 | qemu_coroutine_enter(co, acb); | |
2686 | ||
2687 | return &acb->common; | |
2688 | } | |
2689 | ||
2690 | void bdrv_init(void) | |
2691 | { | |
2692 | module_call_init(MODULE_INIT_BLOCK); | |
2693 | } | |
2694 | ||
2695 | void bdrv_init_with_whitelist(void) | |
2696 | { | |
2697 | use_bdrv_whitelist = 1; | |
2698 | bdrv_init(); | |
2699 | } | |
2700 | ||
2701 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, | |
2702 | BlockDriverCompletionFunc *cb, void *opaque) | |
2703 | { | |
2704 | BlockDriverAIOCB *acb; | |
2705 | ||
2706 | if (pool->free_aiocb) { | |
2707 | acb = pool->free_aiocb; | |
2708 | pool->free_aiocb = acb->next; | |
2709 | } else { | |
2710 | acb = g_malloc0(pool->aiocb_size); | |
2711 | acb->pool = pool; | |
2712 | } | |
2713 | acb->bs = bs; | |
2714 | acb->cb = cb; | |
2715 | acb->opaque = opaque; | |
2716 | return acb; | |
2717 | } | |
2718 | ||
2719 | void qemu_aio_release(void *p) | |
2720 | { | |
2721 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; | |
2722 | AIOPool *pool = acb->pool; | |
2723 | acb->next = pool->free_aiocb; | |
2724 | pool->free_aiocb = acb; | |
2725 | } | |
2726 | ||
2727 | /**************************************************************/ | |
2728 | /* Coroutine block device emulation */ | |
2729 | ||
2730 | typedef struct CoroutineIOCompletion { | |
2731 | Coroutine *coroutine; | |
2732 | int ret; | |
2733 | } CoroutineIOCompletion; | |
2734 | ||
2735 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
2736 | { | |
2737 | CoroutineIOCompletion *co = opaque; | |
2738 | ||
2739 | co->ret = ret; | |
2740 | qemu_coroutine_enter(co->coroutine, NULL); | |
2741 | } | |
2742 | ||
2743 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
2744 | int nb_sectors, QEMUIOVector *iov, | |
2745 | bool is_write) | |
2746 | { | |
2747 | CoroutineIOCompletion co = { | |
2748 | .coroutine = qemu_coroutine_self(), | |
2749 | }; | |
2750 | BlockDriverAIOCB *acb; | |
2751 | ||
2752 | if (is_write) { | |
2753 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, | |
2754 | bdrv_co_io_em_complete, &co); | |
2755 | } else { | |
2756 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, | |
2757 | bdrv_co_io_em_complete, &co); | |
2758 | } | |
2759 | ||
2760 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); | |
2761 | if (!acb) { | |
2762 | return -EIO; | |
2763 | } | |
2764 | qemu_coroutine_yield(); | |
2765 | ||
2766 | return co.ret; | |
2767 | } | |
2768 | ||
2769 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
2770 | int64_t sector_num, int nb_sectors, | |
2771 | QEMUIOVector *iov) | |
2772 | { | |
2773 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
2774 | } | |
2775 | ||
2776 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
2777 | int64_t sector_num, int nb_sectors, | |
2778 | QEMUIOVector *iov) | |
2779 | { | |
2780 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
2781 | } | |
2782 | ||
2783 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) | |
2784 | { | |
2785 | RwCo *rwco = opaque; | |
2786 | ||
2787 | rwco->ret = bdrv_co_flush(rwco->bs); | |
2788 | } | |
2789 | ||
2790 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
2791 | { | |
2792 | int ret; | |
2793 | ||
2794 | if (!bs->drv) { | |
2795 | return 0; | |
2796 | } | |
2797 | ||
2798 | /* Write back cached data to the OS even with cache=unsafe */ | |
2799 | if (bs->drv->bdrv_co_flush_to_os) { | |
2800 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
2801 | if (ret < 0) { | |
2802 | return ret; | |
2803 | } | |
2804 | } | |
2805 | ||
2806 | /* But don't actually force it to the disk with cache=unsafe */ | |
2807 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
2808 | return 0; | |
2809 | } | |
2810 | ||
2811 | if (bs->drv->bdrv_co_flush_to_disk) { | |
2812 | return bs->drv->bdrv_co_flush_to_disk(bs); | |
2813 | } else if (bs->drv->bdrv_aio_flush) { | |
2814 | BlockDriverAIOCB *acb; | |
2815 | CoroutineIOCompletion co = { | |
2816 | .coroutine = qemu_coroutine_self(), | |
2817 | }; | |
2818 | ||
2819 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
2820 | if (acb == NULL) { | |
2821 | return -EIO; | |
2822 | } else { | |
2823 | qemu_coroutine_yield(); | |
2824 | return co.ret; | |
2825 | } | |
2826 | } else { | |
2827 | /* | |
2828 | * Some block drivers always operate in either writethrough or unsafe | |
2829 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
2830 | * know how the server works (because the behaviour is hardcoded or | |
2831 | * depends on server-side configuration), so we can't ensure that | |
2832 | * everything is safe on disk. Returning an error doesn't work because | |
2833 | * that would break guests even if the server operates in writethrough | |
2834 | * mode. | |
2835 | * | |
2836 | * Let's hope the user knows what he's doing. | |
2837 | */ | |
2838 | return 0; | |
2839 | } | |
2840 | } | |
2841 | ||
2842 | void bdrv_invalidate_cache(BlockDriverState *bs) | |
2843 | { | |
2844 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
2845 | bs->drv->bdrv_invalidate_cache(bs); | |
2846 | } | |
2847 | } | |
2848 | ||
2849 | void bdrv_invalidate_cache_all(void) | |
2850 | { | |
2851 | BlockDriverState *bs; | |
2852 | ||
2853 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
2854 | bdrv_invalidate_cache(bs); | |
2855 | } | |
2856 | } | |
2857 | ||
2858 | int bdrv_flush(BlockDriverState *bs) | |
2859 | { | |
2860 | Coroutine *co; | |
2861 | RwCo rwco = { | |
2862 | .bs = bs, | |
2863 | .ret = NOT_DONE, | |
2864 | }; | |
2865 | ||
2866 | if (qemu_in_coroutine()) { | |
2867 | /* Fast-path if already in coroutine context */ | |
2868 | bdrv_flush_co_entry(&rwco); | |
2869 | } else { | |
2870 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
2871 | qemu_coroutine_enter(co, &rwco); | |
2872 | while (rwco.ret == NOT_DONE) { | |
2873 | qemu_aio_wait(); | |
2874 | } | |
2875 | } | |
2876 | ||
2877 | return rwco.ret; | |
2878 | } | |
2879 | ||
2880 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) | |
2881 | { | |
2882 | RwCo *rwco = opaque; | |
2883 | ||
2884 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
2885 | } | |
2886 | ||
2887 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
2888 | int nb_sectors) | |
2889 | { | |
2890 | if (!bs->drv) { | |
2891 | return -ENOMEDIUM; | |
2892 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2893 | return -EIO; | |
2894 | } else if (bs->read_only) { | |
2895 | return -EROFS; | |
2896 | } else if (bs->drv->bdrv_co_discard) { | |
2897 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); | |
2898 | } else if (bs->drv->bdrv_aio_discard) { | |
2899 | BlockDriverAIOCB *acb; | |
2900 | CoroutineIOCompletion co = { | |
2901 | .coroutine = qemu_coroutine_self(), | |
2902 | }; | |
2903 | ||
2904 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
2905 | bdrv_co_io_em_complete, &co); | |
2906 | if (acb == NULL) { | |
2907 | return -EIO; | |
2908 | } else { | |
2909 | qemu_coroutine_yield(); | |
2910 | return co.ret; | |
2911 | } | |
2912 | } else { | |
2913 | return 0; | |
2914 | } | |
2915 | } | |
2916 | ||
2917 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
2918 | { | |
2919 | Coroutine *co; | |
2920 | RwCo rwco = { | |
2921 | .bs = bs, | |
2922 | .sector_num = sector_num, | |
2923 | .nb_sectors = nb_sectors, | |
2924 | .ret = NOT_DONE, | |
2925 | }; | |
2926 | ||
2927 | if (qemu_in_coroutine()) { | |
2928 | /* Fast-path if already in coroutine context */ | |
2929 | bdrv_discard_co_entry(&rwco); | |
2930 | } else { | |
2931 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
2932 | qemu_coroutine_enter(co, &rwco); | |
2933 | while (rwco.ret == NOT_DONE) { | |
2934 | qemu_aio_wait(); | |
2935 | } | |
2936 | } | |
2937 | ||
2938 | return rwco.ret; | |
2939 | } | |
2940 | ||
2941 | /**************************************************************/ | |
2942 | /* removable device support */ | |
2943 | ||
2944 | /** | |
2945 | * Return TRUE if the media is present | |
2946 | */ | |
2947 | int bdrv_is_inserted(BlockDriverState *bs) | |
2948 | { | |
2949 | BlockDriver *drv = bs->drv; | |
2950 | ||
2951 | if (!drv) | |
2952 | return 0; | |
2953 | if (!drv->bdrv_is_inserted) | |
2954 | return 1; | |
2955 | return drv->bdrv_is_inserted(bs); | |
2956 | } | |
2957 | ||
2958 | /** | |
2959 | * Return whether the media changed since the last call to this | |
2960 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
2961 | */ | |
2962 | int bdrv_media_changed(BlockDriverState *bs) | |
2963 | { | |
2964 | BlockDriver *drv = bs->drv; | |
2965 | ||
2966 | if (drv && drv->bdrv_media_changed) { | |
2967 | return drv->bdrv_media_changed(bs); | |
2968 | } | |
2969 | return -ENOTSUP; | |
2970 | } | |
2971 | ||
2972 | /** | |
2973 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2974 | */ | |
2975 | void bdrv_eject(BlockDriverState *bs, int eject_flag) | |
2976 | { | |
2977 | BlockDriver *drv = bs->drv; | |
2978 | ||
2979 | if (drv && drv->bdrv_eject) { | |
2980 | drv->bdrv_eject(bs, eject_flag); | |
2981 | } | |
2982 | } | |
2983 | ||
2984 | /** | |
2985 | * Lock or unlock the media (if it is locked, the user won't be able | |
2986 | * to eject it manually). | |
2987 | */ | |
2988 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) | |
2989 | { | |
2990 | BlockDriver *drv = bs->drv; | |
2991 | ||
2992 | trace_bdrv_lock_medium(bs, locked); | |
2993 | ||
2994 | if (drv && drv->bdrv_lock_medium) { | |
2995 | drv->bdrv_lock_medium(bs, locked); | |
2996 | } | |
2997 | } | |
2998 | ||
2999 | /* needed for generic scsi interface */ | |
3000 | ||
3001 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
3002 | { | |
3003 | BlockDriver *drv = bs->drv; | |
3004 | ||
3005 | if (drv && drv->bdrv_ioctl) | |
3006 | return drv->bdrv_ioctl(bs, req, buf); | |
3007 | return -ENOTSUP; | |
3008 | } | |
3009 | ||
3010 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, | |
3011 | unsigned long int req, void *buf, | |
3012 | BlockDriverCompletionFunc *cb, void *opaque) | |
3013 | { | |
3014 | BlockDriver *drv = bs->drv; | |
3015 | ||
3016 | if (drv && drv->bdrv_aio_ioctl) | |
3017 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
3018 | return NULL; | |
3019 | } | |
3020 | ||
3021 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) | |
3022 | { | |
3023 | bs->buffer_alignment = align; | |
3024 | } | |
3025 | ||
3026 | void *qemu_blockalign(BlockDriverState *bs, size_t size) | |
3027 | { | |
3028 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
3029 | } | |
3030 | ||
3031 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
3032 | { | |
3033 | int64_t bitmap_size; | |
3034 | ||
3035 | bs->dirty_count = 0; | |
3036 | if (enable) { | |
3037 | if (!bs->dirty_bitmap) { | |
3038 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
3039 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
3040 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
3041 | ||
3042 | bs->dirty_bitmap = g_malloc0(bitmap_size); | |
3043 | } | |
3044 | } else { | |
3045 | if (bs->dirty_bitmap) { | |
3046 | g_free(bs->dirty_bitmap); | |
3047 | bs->dirty_bitmap = NULL; | |
3048 | } | |
3049 | } | |
3050 | } | |
3051 | ||
3052 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
3053 | { | |
3054 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; | |
3055 | ||
3056 | if (bs->dirty_bitmap && | |
3057 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
3058 | return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
3059 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
3060 | } else { | |
3061 | return 0; | |
3062 | } | |
3063 | } | |
3064 | ||
3065 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, | |
3066 | int nr_sectors) | |
3067 | { | |
3068 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
3069 | } | |
3070 | ||
3071 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
3072 | { | |
3073 | return bs->dirty_count; | |
3074 | } | |
3075 | ||
3076 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) | |
3077 | { | |
3078 | assert(bs->in_use != in_use); | |
3079 | bs->in_use = in_use; | |
3080 | } | |
3081 | ||
3082 | int bdrv_in_use(BlockDriverState *bs) | |
3083 | { | |
3084 | return bs->in_use; | |
3085 | } | |
3086 | ||
3087 | void bdrv_iostatus_enable(BlockDriverState *bs) | |
3088 | { | |
3089 | bs->iostatus_enabled = true; | |
3090 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
3091 | } | |
3092 | ||
3093 | /* The I/O status is only enabled if the drive explicitly | |
3094 | * enables it _and_ the VM is configured to stop on errors */ | |
3095 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
3096 | { | |
3097 | return (bs->iostatus_enabled && | |
3098 | (bs->on_write_error == BLOCK_ERR_STOP_ENOSPC || | |
3099 | bs->on_write_error == BLOCK_ERR_STOP_ANY || | |
3100 | bs->on_read_error == BLOCK_ERR_STOP_ANY)); | |
3101 | } | |
3102 | ||
3103 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
3104 | { | |
3105 | bs->iostatus_enabled = false; | |
3106 | } | |
3107 | ||
3108 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
3109 | { | |
3110 | if (bdrv_iostatus_is_enabled(bs)) { | |
3111 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
3112 | } | |
3113 | } | |
3114 | ||
3115 | /* XXX: Today this is set by device models because it makes the implementation | |
3116 | quite simple. However, the block layer knows about the error, so it's | |
3117 | possible to implement this without device models being involved */ | |
3118 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) | |
3119 | { | |
3120 | if (bdrv_iostatus_is_enabled(bs) && | |
3121 | bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
3122 | assert(error >= 0); | |
3123 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
3124 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
3125 | } | |
3126 | } | |
3127 | ||
3128 | void | |
3129 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
3130 | enum BlockAcctType type) | |
3131 | { | |
3132 | assert(type < BDRV_MAX_IOTYPE); | |
3133 | ||
3134 | cookie->bytes = bytes; | |
3135 | cookie->start_time_ns = get_clock(); | |
3136 | cookie->type = type; | |
3137 | } | |
3138 | ||
3139 | void | |
3140 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
3141 | { | |
3142 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
3143 | ||
3144 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
3145 | bs->nr_ops[cookie->type]++; | |
3146 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; | |
3147 | } | |
3148 | ||
3149 | int bdrv_img_create(const char *filename, const char *fmt, | |
3150 | const char *base_filename, const char *base_fmt, | |
3151 | char *options, uint64_t img_size, int flags) | |
3152 | { | |
3153 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
3154 | QEMUOptionParameter *backing_fmt, *backing_file, *size; | |
3155 | BlockDriverState *bs = NULL; | |
3156 | BlockDriver *drv, *proto_drv; | |
3157 | BlockDriver *backing_drv = NULL; | |
3158 | int ret = 0; | |
3159 | ||
3160 | /* Find driver and parse its options */ | |
3161 | drv = bdrv_find_format(fmt); | |
3162 | if (!drv) { | |
3163 | error_report("Unknown file format '%s'", fmt); | |
3164 | ret = -EINVAL; | |
3165 | goto out; | |
3166 | } | |
3167 | ||
3168 | proto_drv = bdrv_find_protocol(filename); | |
3169 | if (!proto_drv) { | |
3170 | error_report("Unknown protocol '%s'", filename); | |
3171 | ret = -EINVAL; | |
3172 | goto out; | |
3173 | } | |
3174 | ||
3175 | create_options = append_option_parameters(create_options, | |
3176 | drv->create_options); | |
3177 | create_options = append_option_parameters(create_options, | |
3178 | proto_drv->create_options); | |
3179 | ||
3180 | /* Create parameter list with default values */ | |
3181 | param = parse_option_parameters("", create_options, param); | |
3182 | ||
3183 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
3184 | ||
3185 | /* Parse -o options */ | |
3186 | if (options) { | |
3187 | param = parse_option_parameters(options, create_options, param); | |
3188 | if (param == NULL) { | |
3189 | error_report("Invalid options for file format '%s'.", fmt); | |
3190 | ret = -EINVAL; | |
3191 | goto out; | |
3192 | } | |
3193 | } | |
3194 | ||
3195 | if (base_filename) { | |
3196 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
3197 | base_filename)) { | |
3198 | error_report("Backing file not supported for file format '%s'", | |
3199 | fmt); | |
3200 | ret = -EINVAL; | |
3201 | goto out; | |
3202 | } | |
3203 | } | |
3204 | ||
3205 | if (base_fmt) { | |
3206 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
3207 | error_report("Backing file format not supported for file " | |
3208 | "format '%s'", fmt); | |
3209 | ret = -EINVAL; | |
3210 | goto out; | |
3211 | } | |
3212 | } | |
3213 | ||
3214 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); | |
3215 | if (backing_file && backing_file->value.s) { | |
3216 | if (!strcmp(filename, backing_file->value.s)) { | |
3217 | error_report("Error: Trying to create an image with the " | |
3218 | "same filename as the backing file"); | |
3219 | ret = -EINVAL; | |
3220 | goto out; | |
3221 | } | |
3222 | } | |
3223 | ||
3224 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); | |
3225 | if (backing_fmt && backing_fmt->value.s) { | |
3226 | backing_drv = bdrv_find_format(backing_fmt->value.s); | |
3227 | if (!backing_drv) { | |
3228 | error_report("Unknown backing file format '%s'", | |
3229 | backing_fmt->value.s); | |
3230 | ret = -EINVAL; | |
3231 | goto out; | |
3232 | } | |
3233 | } | |
3234 | ||
3235 | // The size for the image must always be specified, with one exception: | |
3236 | // If we are using a backing file, we can obtain the size from there | |
3237 | size = get_option_parameter(param, BLOCK_OPT_SIZE); | |
3238 | if (size && size->value.n == -1) { | |
3239 | if (backing_file && backing_file->value.s) { | |
3240 | uint64_t size; | |
3241 | char buf[32]; | |
3242 | ||
3243 | bs = bdrv_new(""); | |
3244 | ||
3245 | ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv); | |
3246 | if (ret < 0) { | |
3247 | error_report("Could not open '%s'", backing_file->value.s); | |
3248 | goto out; | |
3249 | } | |
3250 | bdrv_get_geometry(bs, &size); | |
3251 | size *= 512; | |
3252 | ||
3253 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
3254 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
3255 | } else { | |
3256 | error_report("Image creation needs a size parameter"); | |
3257 | ret = -EINVAL; | |
3258 | goto out; | |
3259 | } | |
3260 | } | |
3261 | ||
3262 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
3263 | print_option_parameters(param); | |
3264 | puts(""); | |
3265 | ||
3266 | ret = bdrv_create(drv, filename, param); | |
3267 | ||
3268 | if (ret < 0) { | |
3269 | if (ret == -ENOTSUP) { | |
3270 | error_report("Formatting or formatting option not supported for " | |
3271 | "file format '%s'", fmt); | |
3272 | } else if (ret == -EFBIG) { | |
3273 | error_report("The image size is too large for file format '%s'", | |
3274 | fmt); | |
3275 | } else { | |
3276 | error_report("%s: error while creating %s: %s", filename, fmt, | |
3277 | strerror(-ret)); | |
3278 | } | |
3279 | } | |
3280 | ||
3281 | out: | |
3282 | free_option_parameters(create_options); | |
3283 | free_option_parameters(param); | |
3284 | ||
3285 | if (bs) { | |
3286 | bdrv_delete(bs); | |
3287 | } | |
3288 | ||
3289 | return ret; | |
3290 | } |