root / block.c @ 0fead125
History | View | Annotate | Download (35.9 kB)
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 "qemu-common.h" |
25 |
#ifndef QEMU_IMG
|
26 |
#include "console.h" |
27 |
#endif
|
28 |
#include "block_int.h" |
29 |
|
30 |
#ifdef _BSD
|
31 |
#include <sys/types.h> |
32 |
#include <sys/stat.h> |
33 |
#include <sys/ioctl.h> |
34 |
#include <sys/queue.h> |
35 |
#include <sys/disk.h> |
36 |
#endif
|
37 |
|
38 |
#define SECTOR_BITS 9 |
39 |
#define SECTOR_SIZE (1 << SECTOR_BITS) |
40 |
|
41 |
typedef struct BlockDriverAIOCBSync { |
42 |
BlockDriverAIOCB common; |
43 |
QEMUBH *bh; |
44 |
int ret;
|
45 |
} BlockDriverAIOCBSync; |
46 |
|
47 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
48 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
49 |
BlockDriverCompletionFunc *cb, void *opaque);
|
50 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
51 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
52 |
BlockDriverCompletionFunc *cb, void *opaque);
|
53 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
54 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
55 |
uint8_t *buf, int nb_sectors);
|
56 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
57 |
const uint8_t *buf, int nb_sectors); |
58 |
|
59 |
BlockDriverState *bdrv_first; |
60 |
static BlockDriver *first_drv;
|
61 |
|
62 |
int path_is_absolute(const char *path) |
63 |
{ |
64 |
const char *p; |
65 |
#ifdef _WIN32
|
66 |
/* specific case for names like: "\\.\d:" */
|
67 |
if (*path == '/' || *path == '\\') |
68 |
return 1; |
69 |
#endif
|
70 |
p = strchr(path, ':');
|
71 |
if (p)
|
72 |
p++; |
73 |
else
|
74 |
p = path; |
75 |
#ifdef _WIN32
|
76 |
return (*p == '/' || *p == '\\'); |
77 |
#else
|
78 |
return (*p == '/'); |
79 |
#endif
|
80 |
} |
81 |
|
82 |
/* if filename is absolute, just copy it to dest. Otherwise, build a
|
83 |
path to it by considering it is relative to base_path. URL are
|
84 |
supported. */
|
85 |
void path_combine(char *dest, int dest_size, |
86 |
const char *base_path, |
87 |
const char *filename) |
88 |
{ |
89 |
const char *p, *p1; |
90 |
int len;
|
91 |
|
92 |
if (dest_size <= 0) |
93 |
return;
|
94 |
if (path_is_absolute(filename)) {
|
95 |
pstrcpy(dest, dest_size, filename); |
96 |
} else {
|
97 |
p = strchr(base_path, ':');
|
98 |
if (p)
|
99 |
p++; |
100 |
else
|
101 |
p = base_path; |
102 |
p1 = strrchr(base_path, '/');
|
103 |
#ifdef _WIN32
|
104 |
{ |
105 |
const char *p2; |
106 |
p2 = strrchr(base_path, '\\');
|
107 |
if (!p1 || p2 > p1)
|
108 |
p1 = p2; |
109 |
} |
110 |
#endif
|
111 |
if (p1)
|
112 |
p1++; |
113 |
else
|
114 |
p1 = base_path; |
115 |
if (p1 > p)
|
116 |
p = p1; |
117 |
len = p - base_path; |
118 |
if (len > dest_size - 1) |
119 |
len = dest_size - 1;
|
120 |
memcpy(dest, base_path, len); |
121 |
dest[len] = '\0';
|
122 |
pstrcat(dest, dest_size, filename); |
123 |
} |
124 |
} |
125 |
|
126 |
|
127 |
static void bdrv_register(BlockDriver *bdrv) |
128 |
{ |
129 |
if (!bdrv->bdrv_aio_read) {
|
130 |
/* add AIO emulation layer */
|
131 |
bdrv->bdrv_aio_read = bdrv_aio_read_em; |
132 |
bdrv->bdrv_aio_write = bdrv_aio_write_em; |
133 |
bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
134 |
bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
|
135 |
} else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
136 |
/* add synchronous IO emulation layer */
|
137 |
bdrv->bdrv_read = bdrv_read_em; |
138 |
bdrv->bdrv_write = bdrv_write_em; |
139 |
} |
140 |
bdrv->next = first_drv; |
141 |
first_drv = bdrv; |
142 |
} |
143 |
|
144 |
/* create a new block device (by default it is empty) */
|
145 |
BlockDriverState *bdrv_new(const char *device_name) |
146 |
{ |
147 |
BlockDriverState **pbs, *bs; |
148 |
|
149 |
bs = qemu_mallocz(sizeof(BlockDriverState));
|
150 |
if(!bs)
|
151 |
return NULL; |
152 |
pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
|
153 |
if (device_name[0] != '\0') { |
154 |
/* insert at the end */
|
155 |
pbs = &bdrv_first; |
156 |
while (*pbs != NULL) |
157 |
pbs = &(*pbs)->next; |
158 |
*pbs = bs; |
159 |
} |
160 |
return bs;
|
161 |
} |
162 |
|
163 |
BlockDriver *bdrv_find_format(const char *format_name) |
164 |
{ |
165 |
BlockDriver *drv1; |
166 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
167 |
if (!strcmp(drv1->format_name, format_name))
|
168 |
return drv1;
|
169 |
} |
170 |
return NULL; |
171 |
} |
172 |
|
173 |
int bdrv_create(BlockDriver *drv,
|
174 |
const char *filename, int64_t size_in_sectors, |
175 |
const char *backing_file, int flags) |
176 |
{ |
177 |
if (!drv->bdrv_create)
|
178 |
return -ENOTSUP;
|
179 |
return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
|
180 |
} |
181 |
|
182 |
#ifdef _WIN32
|
183 |
void get_tmp_filename(char *filename, int size) |
184 |
{ |
185 |
char temp_dir[MAX_PATH];
|
186 |
|
187 |
GetTempPath(MAX_PATH, temp_dir); |
188 |
GetTempFileName(temp_dir, "qem", 0, filename); |
189 |
} |
190 |
#else
|
191 |
void get_tmp_filename(char *filename, int size) |
192 |
{ |
193 |
int fd;
|
194 |
char *tmpdir;
|
195 |
/* XXX: race condition possible */
|
196 |
tmpdir = getenv("TMPDIR");
|
197 |
if (!tmpdir)
|
198 |
tmpdir = "/tmp";
|
199 |
snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
|
200 |
fd = mkstemp(filename); |
201 |
close(fd); |
202 |
} |
203 |
#endif
|
204 |
|
205 |
#ifdef _WIN32
|
206 |
static int is_windows_drive_prefix(const char *filename) |
207 |
{ |
208 |
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
209 |
(filename[0] >= 'A' && filename[0] <= 'Z')) && |
210 |
filename[1] == ':'); |
211 |
} |
212 |
|
213 |
static int is_windows_drive(const char *filename) |
214 |
{ |
215 |
if (is_windows_drive_prefix(filename) &&
|
216 |
filename[2] == '\0') |
217 |
return 1; |
218 |
if (strstart(filename, "\\\\.\\", NULL) || |
219 |
strstart(filename, "//./", NULL)) |
220 |
return 1; |
221 |
return 0; |
222 |
} |
223 |
#endif
|
224 |
|
225 |
static BlockDriver *find_protocol(const char *filename) |
226 |
{ |
227 |
BlockDriver *drv1; |
228 |
char protocol[128]; |
229 |
int len;
|
230 |
const char *p; |
231 |
|
232 |
#ifdef _WIN32
|
233 |
if (is_windows_drive(filename) ||
|
234 |
is_windows_drive_prefix(filename)) |
235 |
return &bdrv_raw;
|
236 |
#endif
|
237 |
p = strchr(filename, ':');
|
238 |
if (!p)
|
239 |
return &bdrv_raw;
|
240 |
len = p - filename; |
241 |
if (len > sizeof(protocol) - 1) |
242 |
len = sizeof(protocol) - 1; |
243 |
memcpy(protocol, filename, len); |
244 |
protocol[len] = '\0';
|
245 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
246 |
if (drv1->protocol_name &&
|
247 |
!strcmp(drv1->protocol_name, protocol)) |
248 |
return drv1;
|
249 |
} |
250 |
return NULL; |
251 |
} |
252 |
|
253 |
/* XXX: force raw format if block or character device ? It would
|
254 |
simplify the BSD case */
|
255 |
static BlockDriver *find_image_format(const char *filename) |
256 |
{ |
257 |
int ret, score, score_max;
|
258 |
BlockDriver *drv1, *drv; |
259 |
uint8_t buf[2048];
|
260 |
BlockDriverState *bs; |
261 |
|
262 |
/* detect host devices. By convention, /dev/cdrom[N] is always
|
263 |
recognized as a host CDROM */
|
264 |
if (strstart(filename, "/dev/cdrom", NULL)) |
265 |
return &bdrv_host_device;
|
266 |
#ifdef _WIN32
|
267 |
if (is_windows_drive(filename))
|
268 |
return &bdrv_host_device;
|
269 |
#else
|
270 |
{ |
271 |
struct stat st;
|
272 |
if (stat(filename, &st) >= 0 && |
273 |
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
274 |
return &bdrv_host_device;
|
275 |
} |
276 |
} |
277 |
#endif
|
278 |
|
279 |
drv = find_protocol(filename); |
280 |
/* no need to test disk image formats for vvfat */
|
281 |
if (drv == &bdrv_vvfat)
|
282 |
return drv;
|
283 |
|
284 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
285 |
if (ret < 0) |
286 |
return NULL; |
287 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
288 |
bdrv_delete(bs); |
289 |
if (ret < 0) { |
290 |
return NULL; |
291 |
} |
292 |
|
293 |
score_max = 0;
|
294 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
295 |
if (drv1->bdrv_probe) {
|
296 |
score = drv1->bdrv_probe(buf, ret, filename); |
297 |
if (score > score_max) {
|
298 |
score_max = score; |
299 |
drv = drv1; |
300 |
} |
301 |
} |
302 |
} |
303 |
return drv;
|
304 |
} |
305 |
|
306 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
307 |
{ |
308 |
BlockDriverState *bs; |
309 |
int ret;
|
310 |
|
311 |
bs = bdrv_new("");
|
312 |
if (!bs)
|
313 |
return -ENOMEM;
|
314 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
315 |
if (ret < 0) { |
316 |
bdrv_delete(bs); |
317 |
return ret;
|
318 |
} |
319 |
*pbs = bs; |
320 |
return 0; |
321 |
} |
322 |
|
323 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
324 |
{ |
325 |
return bdrv_open2(bs, filename, flags, NULL); |
326 |
} |
327 |
|
328 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
329 |
BlockDriver *drv) |
330 |
{ |
331 |
int ret, open_flags;
|
332 |
char tmp_filename[PATH_MAX];
|
333 |
char backing_filename[PATH_MAX];
|
334 |
|
335 |
bs->read_only = 0;
|
336 |
bs->is_temporary = 0;
|
337 |
bs->encrypted = 0;
|
338 |
|
339 |
if (flags & BDRV_O_SNAPSHOT) {
|
340 |
BlockDriverState *bs1; |
341 |
int64_t total_size; |
342 |
|
343 |
/* if snapshot, we create a temporary backing file and open it
|
344 |
instead of opening 'filename' directly */
|
345 |
|
346 |
/* if there is a backing file, use it */
|
347 |
bs1 = bdrv_new("");
|
348 |
if (!bs1) {
|
349 |
return -ENOMEM;
|
350 |
} |
351 |
if (bdrv_open(bs1, filename, 0) < 0) { |
352 |
bdrv_delete(bs1); |
353 |
return -1; |
354 |
} |
355 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
356 |
bdrv_delete(bs1); |
357 |
|
358 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
359 |
realpath(filename, backing_filename); |
360 |
if (bdrv_create(&bdrv_qcow2, tmp_filename,
|
361 |
total_size, backing_filename, 0) < 0) { |
362 |
return -1; |
363 |
} |
364 |
filename = tmp_filename; |
365 |
bs->is_temporary = 1;
|
366 |
} |
367 |
|
368 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
369 |
if (flags & BDRV_O_FILE) {
|
370 |
drv = find_protocol(filename); |
371 |
if (!drv)
|
372 |
return -ENOENT;
|
373 |
} else {
|
374 |
if (!drv) {
|
375 |
drv = find_image_format(filename); |
376 |
if (!drv)
|
377 |
return -1; |
378 |
} |
379 |
} |
380 |
bs->drv = drv; |
381 |
bs->opaque = qemu_mallocz(drv->instance_size); |
382 |
if (bs->opaque == NULL && drv->instance_size > 0) |
383 |
return -1; |
384 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
385 |
RDONLY as fallback */
|
386 |
if (!(flags & BDRV_O_FILE))
|
387 |
open_flags = BDRV_O_RDWR | (flags & BDRV_O_DIRECT); |
388 |
else
|
389 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
390 |
ret = drv->bdrv_open(bs, filename, open_flags); |
391 |
if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
|
392 |
ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); |
393 |
bs->read_only = 1;
|
394 |
} |
395 |
if (ret < 0) { |
396 |
qemu_free(bs->opaque); |
397 |
bs->opaque = NULL;
|
398 |
bs->drv = NULL;
|
399 |
return ret;
|
400 |
} |
401 |
if (drv->bdrv_getlength) {
|
402 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
403 |
} |
404 |
#ifndef _WIN32
|
405 |
if (bs->is_temporary) {
|
406 |
unlink(filename); |
407 |
} |
408 |
#endif
|
409 |
if (bs->backing_file[0] != '\0') { |
410 |
/* if there is a backing file, use it */
|
411 |
bs->backing_hd = bdrv_new("");
|
412 |
if (!bs->backing_hd) {
|
413 |
fail:
|
414 |
bdrv_close(bs); |
415 |
return -ENOMEM;
|
416 |
} |
417 |
path_combine(backing_filename, sizeof(backing_filename),
|
418 |
filename, bs->backing_file); |
419 |
if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) |
420 |
goto fail;
|
421 |
} |
422 |
|
423 |
/* call the change callback */
|
424 |
bs->media_changed = 1;
|
425 |
if (bs->change_cb)
|
426 |
bs->change_cb(bs->change_opaque); |
427 |
|
428 |
return 0; |
429 |
} |
430 |
|
431 |
void bdrv_close(BlockDriverState *bs)
|
432 |
{ |
433 |
if (bs->drv) {
|
434 |
if (bs->backing_hd)
|
435 |
bdrv_delete(bs->backing_hd); |
436 |
bs->drv->bdrv_close(bs); |
437 |
qemu_free(bs->opaque); |
438 |
#ifdef _WIN32
|
439 |
if (bs->is_temporary) {
|
440 |
unlink(bs->filename); |
441 |
} |
442 |
#endif
|
443 |
bs->opaque = NULL;
|
444 |
bs->drv = NULL;
|
445 |
|
446 |
/* call the change callback */
|
447 |
bs->media_changed = 1;
|
448 |
if (bs->change_cb)
|
449 |
bs->change_cb(bs->change_opaque); |
450 |
} |
451 |
} |
452 |
|
453 |
void bdrv_delete(BlockDriverState *bs)
|
454 |
{ |
455 |
BlockDriverState **pbs; |
456 |
|
457 |
pbs = &bdrv_first; |
458 |
while (*pbs != bs && *pbs != NULL) |
459 |
pbs = &(*pbs)->next; |
460 |
if (*pbs == bs)
|
461 |
*pbs = bs->next; |
462 |
|
463 |
bdrv_close(bs); |
464 |
qemu_free(bs); |
465 |
} |
466 |
|
467 |
/* commit COW file into the raw image */
|
468 |
int bdrv_commit(BlockDriverState *bs)
|
469 |
{ |
470 |
BlockDriver *drv = bs->drv; |
471 |
int64_t i, total_sectors; |
472 |
int n, j;
|
473 |
unsigned char sector[512]; |
474 |
|
475 |
if (!drv)
|
476 |
return -ENOMEDIUM;
|
477 |
|
478 |
if (bs->read_only) {
|
479 |
return -EACCES;
|
480 |
} |
481 |
|
482 |
if (!bs->backing_hd) {
|
483 |
return -ENOTSUP;
|
484 |
} |
485 |
|
486 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
487 |
for (i = 0; i < total_sectors;) { |
488 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
489 |
for(j = 0; j < n; j++) { |
490 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
491 |
return -EIO;
|
492 |
} |
493 |
|
494 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
495 |
return -EIO;
|
496 |
} |
497 |
i++; |
498 |
} |
499 |
} else {
|
500 |
i += n; |
501 |
} |
502 |
} |
503 |
|
504 |
if (drv->bdrv_make_empty)
|
505 |
return drv->bdrv_make_empty(bs);
|
506 |
|
507 |
return 0; |
508 |
} |
509 |
|
510 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
511 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
512 |
uint8_t *buf, int nb_sectors)
|
513 |
{ |
514 |
BlockDriver *drv = bs->drv; |
515 |
|
516 |
if (!drv)
|
517 |
return -ENOMEDIUM;
|
518 |
|
519 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
520 |
memcpy(buf, bs->boot_sector_data, 512);
|
521 |
sector_num++; |
522 |
nb_sectors--; |
523 |
buf += 512;
|
524 |
if (nb_sectors == 0) |
525 |
return 0; |
526 |
} |
527 |
if (drv->bdrv_pread) {
|
528 |
int ret, len;
|
529 |
len = nb_sectors * 512;
|
530 |
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
|
531 |
if (ret < 0) |
532 |
return ret;
|
533 |
else if (ret != len) |
534 |
return -EINVAL;
|
535 |
else {
|
536 |
bs->rd_bytes += (unsigned) len;
|
537 |
bs->rd_ops ++; |
538 |
return 0; |
539 |
} |
540 |
} else {
|
541 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
542 |
} |
543 |
} |
544 |
|
545 |
/* Return < 0 if error. Important errors are:
|
546 |
-EIO generic I/O error (may happen for all errors)
|
547 |
-ENOMEDIUM No media inserted.
|
548 |
-EINVAL Invalid sector number or nb_sectors
|
549 |
-EACCES Trying to write a read-only device
|
550 |
*/
|
551 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
552 |
const uint8_t *buf, int nb_sectors) |
553 |
{ |
554 |
BlockDriver *drv = bs->drv; |
555 |
if (!bs->drv)
|
556 |
return -ENOMEDIUM;
|
557 |
if (bs->read_only)
|
558 |
return -EACCES;
|
559 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
560 |
memcpy(bs->boot_sector_data, buf, 512);
|
561 |
} |
562 |
if (drv->bdrv_pwrite) {
|
563 |
int ret, len;
|
564 |
len = nb_sectors * 512;
|
565 |
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
|
566 |
if (ret < 0) |
567 |
return ret;
|
568 |
else if (ret != len) |
569 |
return -EIO;
|
570 |
else {
|
571 |
bs->wr_bytes += (unsigned) len;
|
572 |
bs->wr_ops ++; |
573 |
return 0; |
574 |
} |
575 |
} else {
|
576 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
577 |
} |
578 |
} |
579 |
|
580 |
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
581 |
uint8_t *buf, int count1)
|
582 |
{ |
583 |
uint8_t tmp_buf[SECTOR_SIZE]; |
584 |
int len, nb_sectors, count;
|
585 |
int64_t sector_num; |
586 |
|
587 |
count = count1; |
588 |
/* first read to align to sector start */
|
589 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
590 |
if (len > count)
|
591 |
len = count; |
592 |
sector_num = offset >> SECTOR_BITS; |
593 |
if (len > 0) { |
594 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
595 |
return -EIO;
|
596 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
597 |
count -= len; |
598 |
if (count == 0) |
599 |
return count1;
|
600 |
sector_num++; |
601 |
buf += len; |
602 |
} |
603 |
|
604 |
/* read the sectors "in place" */
|
605 |
nb_sectors = count >> SECTOR_BITS; |
606 |
if (nb_sectors > 0) { |
607 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
608 |
return -EIO;
|
609 |
sector_num += nb_sectors; |
610 |
len = nb_sectors << SECTOR_BITS; |
611 |
buf += len; |
612 |
count -= len; |
613 |
} |
614 |
|
615 |
/* add data from the last sector */
|
616 |
if (count > 0) { |
617 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
618 |
return -EIO;
|
619 |
memcpy(buf, tmp_buf, count); |
620 |
} |
621 |
return count1;
|
622 |
} |
623 |
|
624 |
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
625 |
const uint8_t *buf, int count1) |
626 |
{ |
627 |
uint8_t tmp_buf[SECTOR_SIZE]; |
628 |
int len, nb_sectors, count;
|
629 |
int64_t sector_num; |
630 |
|
631 |
count = count1; |
632 |
/* first write to align to sector start */
|
633 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
634 |
if (len > count)
|
635 |
len = count; |
636 |
sector_num = offset >> SECTOR_BITS; |
637 |
if (len > 0) { |
638 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
639 |
return -EIO;
|
640 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
641 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
642 |
return -EIO;
|
643 |
count -= len; |
644 |
if (count == 0) |
645 |
return count1;
|
646 |
sector_num++; |
647 |
buf += len; |
648 |
} |
649 |
|
650 |
/* write the sectors "in place" */
|
651 |
nb_sectors = count >> SECTOR_BITS; |
652 |
if (nb_sectors > 0) { |
653 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
654 |
return -EIO;
|
655 |
sector_num += nb_sectors; |
656 |
len = nb_sectors << SECTOR_BITS; |
657 |
buf += len; |
658 |
count -= len; |
659 |
} |
660 |
|
661 |
/* add data from the last sector */
|
662 |
if (count > 0) { |
663 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
664 |
return -EIO;
|
665 |
memcpy(tmp_buf, buf, count); |
666 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
667 |
return -EIO;
|
668 |
} |
669 |
return count1;
|
670 |
} |
671 |
|
672 |
/**
|
673 |
* Read with byte offsets (needed only for file protocols)
|
674 |
*/
|
675 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
676 |
void *buf1, int count1) |
677 |
{ |
678 |
BlockDriver *drv = bs->drv; |
679 |
|
680 |
if (!drv)
|
681 |
return -ENOMEDIUM;
|
682 |
if (!drv->bdrv_pread)
|
683 |
return bdrv_pread_em(bs, offset, buf1, count1);
|
684 |
return drv->bdrv_pread(bs, offset, buf1, count1);
|
685 |
} |
686 |
|
687 |
/**
|
688 |
* Write with byte offsets (needed only for file protocols)
|
689 |
*/
|
690 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
691 |
const void *buf1, int count1) |
692 |
{ |
693 |
BlockDriver *drv = bs->drv; |
694 |
|
695 |
if (!drv)
|
696 |
return -ENOMEDIUM;
|
697 |
if (!drv->bdrv_pwrite)
|
698 |
return bdrv_pwrite_em(bs, offset, buf1, count1);
|
699 |
return drv->bdrv_pwrite(bs, offset, buf1, count1);
|
700 |
} |
701 |
|
702 |
/**
|
703 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
704 |
*/
|
705 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
706 |
{ |
707 |
BlockDriver *drv = bs->drv; |
708 |
if (!drv)
|
709 |
return -ENOMEDIUM;
|
710 |
if (!drv->bdrv_truncate)
|
711 |
return -ENOTSUP;
|
712 |
return drv->bdrv_truncate(bs, offset);
|
713 |
} |
714 |
|
715 |
/**
|
716 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
717 |
*/
|
718 |
int64_t bdrv_getlength(BlockDriverState *bs) |
719 |
{ |
720 |
BlockDriver *drv = bs->drv; |
721 |
if (!drv)
|
722 |
return -ENOMEDIUM;
|
723 |
if (!drv->bdrv_getlength) {
|
724 |
/* legacy mode */
|
725 |
return bs->total_sectors * SECTOR_SIZE;
|
726 |
} |
727 |
return drv->bdrv_getlength(bs);
|
728 |
} |
729 |
|
730 |
/* return 0 as number of sectors if no device present or error */
|
731 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
732 |
{ |
733 |
int64_t length; |
734 |
length = bdrv_getlength(bs); |
735 |
if (length < 0) |
736 |
length = 0;
|
737 |
else
|
738 |
length = length >> SECTOR_BITS; |
739 |
*nb_sectors_ptr = length; |
740 |
} |
741 |
|
742 |
/* force a given boot sector. */
|
743 |
void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) |
744 |
{ |
745 |
bs->boot_sector_enabled = 1;
|
746 |
if (size > 512) |
747 |
size = 512;
|
748 |
memcpy(bs->boot_sector_data, data, size); |
749 |
memset(bs->boot_sector_data + size, 0, 512 - size); |
750 |
} |
751 |
|
752 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
753 |
int cyls, int heads, int secs) |
754 |
{ |
755 |
bs->cyls = cyls; |
756 |
bs->heads = heads; |
757 |
bs->secs = secs; |
758 |
} |
759 |
|
760 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
761 |
{ |
762 |
bs->type = type; |
763 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
764 |
type == BDRV_TYPE_FLOPPY)); |
765 |
} |
766 |
|
767 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
768 |
{ |
769 |
bs->translation = translation; |
770 |
} |
771 |
|
772 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
773 |
int *pcyls, int *pheads, int *psecs) |
774 |
{ |
775 |
*pcyls = bs->cyls; |
776 |
*pheads = bs->heads; |
777 |
*psecs = bs->secs; |
778 |
} |
779 |
|
780 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
781 |
{ |
782 |
return bs->type;
|
783 |
} |
784 |
|
785 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
786 |
{ |
787 |
return bs->translation;
|
788 |
} |
789 |
|
790 |
int bdrv_is_removable(BlockDriverState *bs)
|
791 |
{ |
792 |
return bs->removable;
|
793 |
} |
794 |
|
795 |
int bdrv_is_read_only(BlockDriverState *bs)
|
796 |
{ |
797 |
return bs->read_only;
|
798 |
} |
799 |
|
800 |
int bdrv_is_sg(BlockDriverState *bs)
|
801 |
{ |
802 |
return bs->sg;
|
803 |
} |
804 |
|
805 |
/* XXX: no longer used */
|
806 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
807 |
void (*change_cb)(void *opaque), void *opaque) |
808 |
{ |
809 |
bs->change_cb = change_cb; |
810 |
bs->change_opaque = opaque; |
811 |
} |
812 |
|
813 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
814 |
{ |
815 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
816 |
return 1; |
817 |
return bs->encrypted;
|
818 |
} |
819 |
|
820 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
821 |
{ |
822 |
int ret;
|
823 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
824 |
ret = bdrv_set_key(bs->backing_hd, key); |
825 |
if (ret < 0) |
826 |
return ret;
|
827 |
if (!bs->encrypted)
|
828 |
return 0; |
829 |
} |
830 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
831 |
return -1; |
832 |
return bs->drv->bdrv_set_key(bs, key);
|
833 |
} |
834 |
|
835 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
836 |
{ |
837 |
if (!bs->drv) {
|
838 |
buf[0] = '\0'; |
839 |
} else {
|
840 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
841 |
} |
842 |
} |
843 |
|
844 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
845 |
void *opaque)
|
846 |
{ |
847 |
BlockDriver *drv; |
848 |
|
849 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
850 |
it(opaque, drv->format_name); |
851 |
} |
852 |
} |
853 |
|
854 |
BlockDriverState *bdrv_find(const char *name) |
855 |
{ |
856 |
BlockDriverState *bs; |
857 |
|
858 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
859 |
if (!strcmp(name, bs->device_name))
|
860 |
return bs;
|
861 |
} |
862 |
return NULL; |
863 |
} |
864 |
|
865 |
void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
866 |
{ |
867 |
BlockDriverState *bs; |
868 |
|
869 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
870 |
it(opaque, bs->device_name); |
871 |
} |
872 |
} |
873 |
|
874 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
875 |
{ |
876 |
return bs->device_name;
|
877 |
} |
878 |
|
879 |
void bdrv_flush(BlockDriverState *bs)
|
880 |
{ |
881 |
if (bs->drv->bdrv_flush)
|
882 |
bs->drv->bdrv_flush(bs); |
883 |
if (bs->backing_hd)
|
884 |
bdrv_flush(bs->backing_hd); |
885 |
} |
886 |
|
887 |
#ifndef QEMU_IMG
|
888 |
void bdrv_info(void) |
889 |
{ |
890 |
BlockDriverState *bs; |
891 |
|
892 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
893 |
term_printf("%s:", bs->device_name);
|
894 |
term_printf(" type=");
|
895 |
switch(bs->type) {
|
896 |
case BDRV_TYPE_HD:
|
897 |
term_printf("hd");
|
898 |
break;
|
899 |
case BDRV_TYPE_CDROM:
|
900 |
term_printf("cdrom");
|
901 |
break;
|
902 |
case BDRV_TYPE_FLOPPY:
|
903 |
term_printf("floppy");
|
904 |
break;
|
905 |
} |
906 |
term_printf(" removable=%d", bs->removable);
|
907 |
if (bs->removable) {
|
908 |
term_printf(" locked=%d", bs->locked);
|
909 |
} |
910 |
if (bs->drv) {
|
911 |
term_printf(" file=");
|
912 |
term_print_filename(bs->filename); |
913 |
if (bs->backing_file[0] != '\0') { |
914 |
term_printf(" backing_file=");
|
915 |
term_print_filename(bs->backing_file); |
916 |
} |
917 |
term_printf(" ro=%d", bs->read_only);
|
918 |
term_printf(" drv=%s", bs->drv->format_name);
|
919 |
if (bs->encrypted)
|
920 |
term_printf(" encrypted");
|
921 |
} else {
|
922 |
term_printf(" [not inserted]");
|
923 |
} |
924 |
term_printf("\n");
|
925 |
} |
926 |
} |
927 |
|
928 |
/* The "info blockstats" command. */
|
929 |
void bdrv_info_stats (void) |
930 |
{ |
931 |
BlockDriverState *bs; |
932 |
|
933 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
934 |
term_printf ("%s:"
|
935 |
" rd_bytes=%" PRIu64
|
936 |
" wr_bytes=%" PRIu64
|
937 |
" rd_operations=%" PRIu64
|
938 |
" wr_operations=%" PRIu64
|
939 |
"\n",
|
940 |
bs->device_name, |
941 |
bs->rd_bytes, bs->wr_bytes, |
942 |
bs->rd_ops, bs->wr_ops); |
943 |
} |
944 |
} |
945 |
#endif
|
946 |
|
947 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
948 |
char *filename, int filename_size) |
949 |
{ |
950 |
if (!bs->backing_hd) {
|
951 |
pstrcpy(filename, filename_size, "");
|
952 |
} else {
|
953 |
pstrcpy(filename, filename_size, bs->backing_file); |
954 |
} |
955 |
} |
956 |
|
957 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
958 |
const uint8_t *buf, int nb_sectors) |
959 |
{ |
960 |
BlockDriver *drv = bs->drv; |
961 |
if (!drv)
|
962 |
return -ENOMEDIUM;
|
963 |
if (!drv->bdrv_write_compressed)
|
964 |
return -ENOTSUP;
|
965 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
966 |
} |
967 |
|
968 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
969 |
{ |
970 |
BlockDriver *drv = bs->drv; |
971 |
if (!drv)
|
972 |
return -ENOMEDIUM;
|
973 |
if (!drv->bdrv_get_info)
|
974 |
return -ENOTSUP;
|
975 |
memset(bdi, 0, sizeof(*bdi)); |
976 |
return drv->bdrv_get_info(bs, bdi);
|
977 |
} |
978 |
|
979 |
/**************************************************************/
|
980 |
/* handling of snapshots */
|
981 |
|
982 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
983 |
QEMUSnapshotInfo *sn_info) |
984 |
{ |
985 |
BlockDriver *drv = bs->drv; |
986 |
if (!drv)
|
987 |
return -ENOMEDIUM;
|
988 |
if (!drv->bdrv_snapshot_create)
|
989 |
return -ENOTSUP;
|
990 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
991 |
} |
992 |
|
993 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
994 |
const char *snapshot_id) |
995 |
{ |
996 |
BlockDriver *drv = bs->drv; |
997 |
if (!drv)
|
998 |
return -ENOMEDIUM;
|
999 |
if (!drv->bdrv_snapshot_goto)
|
1000 |
return -ENOTSUP;
|
1001 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1002 |
} |
1003 |
|
1004 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1005 |
{ |
1006 |
BlockDriver *drv = bs->drv; |
1007 |
if (!drv)
|
1008 |
return -ENOMEDIUM;
|
1009 |
if (!drv->bdrv_snapshot_delete)
|
1010 |
return -ENOTSUP;
|
1011 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1012 |
} |
1013 |
|
1014 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
1015 |
QEMUSnapshotInfo **psn_info) |
1016 |
{ |
1017 |
BlockDriver *drv = bs->drv; |
1018 |
if (!drv)
|
1019 |
return -ENOMEDIUM;
|
1020 |
if (!drv->bdrv_snapshot_list)
|
1021 |
return -ENOTSUP;
|
1022 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
1023 |
} |
1024 |
|
1025 |
#define NB_SUFFIXES 4 |
1026 |
|
1027 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1028 |
{ |
1029 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1030 |
int64_t base; |
1031 |
int i;
|
1032 |
|
1033 |
if (size <= 999) { |
1034 |
snprintf(buf, buf_size, "%" PRId64, size);
|
1035 |
} else {
|
1036 |
base = 1024;
|
1037 |
for(i = 0; i < NB_SUFFIXES; i++) { |
1038 |
if (size < (10 * base)) { |
1039 |
snprintf(buf, buf_size, "%0.1f%c",
|
1040 |
(double)size / base,
|
1041 |
suffixes[i]); |
1042 |
break;
|
1043 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1044 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
1045 |
((size + (base >> 1)) / base),
|
1046 |
suffixes[i]); |
1047 |
break;
|
1048 |
} |
1049 |
base = base * 1024;
|
1050 |
} |
1051 |
} |
1052 |
return buf;
|
1053 |
} |
1054 |
|
1055 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1056 |
{ |
1057 |
char buf1[128], date_buf[128], clock_buf[128]; |
1058 |
#ifdef _WIN32
|
1059 |
struct tm *ptm;
|
1060 |
#else
|
1061 |
struct tm tm;
|
1062 |
#endif
|
1063 |
time_t ti; |
1064 |
int64_t secs; |
1065 |
|
1066 |
if (!sn) {
|
1067 |
snprintf(buf, buf_size, |
1068 |
"%-10s%-20s%7s%20s%15s",
|
1069 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1070 |
} else {
|
1071 |
ti = sn->date_sec; |
1072 |
#ifdef _WIN32
|
1073 |
ptm = localtime(&ti); |
1074 |
strftime(date_buf, sizeof(date_buf),
|
1075 |
"%Y-%m-%d %H:%M:%S", ptm);
|
1076 |
#else
|
1077 |
localtime_r(&ti, &tm); |
1078 |
strftime(date_buf, sizeof(date_buf),
|
1079 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1080 |
#endif
|
1081 |
secs = sn->vm_clock_nsec / 1000000000;
|
1082 |
snprintf(clock_buf, sizeof(clock_buf),
|
1083 |
"%02d:%02d:%02d.%03d",
|
1084 |
(int)(secs / 3600), |
1085 |
(int)((secs / 60) % 60), |
1086 |
(int)(secs % 60), |
1087 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1088 |
snprintf(buf, buf_size, |
1089 |
"%-10s%-20s%7s%20s%15s",
|
1090 |
sn->id_str, sn->name, |
1091 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1092 |
date_buf, |
1093 |
clock_buf); |
1094 |
} |
1095 |
return buf;
|
1096 |
} |
1097 |
|
1098 |
|
1099 |
/**************************************************************/
|
1100 |
/* async I/Os */
|
1101 |
|
1102 |
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
1103 |
uint8_t *buf, int nb_sectors,
|
1104 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1105 |
{ |
1106 |
BlockDriver *drv = bs->drv; |
1107 |
BlockDriverAIOCB *ret; |
1108 |
|
1109 |
if (!drv)
|
1110 |
return NULL; |
1111 |
|
1112 |
/* XXX: we assume that nb_sectors == 0 is suppored by the async read */
|
1113 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
1114 |
memcpy(buf, bs->boot_sector_data, 512);
|
1115 |
sector_num++; |
1116 |
nb_sectors--; |
1117 |
buf += 512;
|
1118 |
} |
1119 |
|
1120 |
ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
1121 |
|
1122 |
if (ret) {
|
1123 |
/* Update stats even though technically transfer has not happened. */
|
1124 |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1125 |
bs->rd_ops ++; |
1126 |
} |
1127 |
|
1128 |
return ret;
|
1129 |
} |
1130 |
|
1131 |
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
1132 |
const uint8_t *buf, int nb_sectors, |
1133 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1134 |
{ |
1135 |
BlockDriver *drv = bs->drv; |
1136 |
BlockDriverAIOCB *ret; |
1137 |
|
1138 |
if (!drv)
|
1139 |
return NULL; |
1140 |
if (bs->read_only)
|
1141 |
return NULL; |
1142 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
1143 |
memcpy(bs->boot_sector_data, buf, 512);
|
1144 |
} |
1145 |
|
1146 |
ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
1147 |
|
1148 |
if (ret) {
|
1149 |
/* Update stats even though technically transfer has not happened. */
|
1150 |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1151 |
bs->wr_ops ++; |
1152 |
} |
1153 |
|
1154 |
return ret;
|
1155 |
} |
1156 |
|
1157 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
1158 |
{ |
1159 |
BlockDriver *drv = acb->bs->drv; |
1160 |
|
1161 |
drv->bdrv_aio_cancel(acb); |
1162 |
} |
1163 |
|
1164 |
|
1165 |
/**************************************************************/
|
1166 |
/* async block device emulation */
|
1167 |
|
1168 |
#ifdef QEMU_IMG
|
1169 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
1170 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
1171 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1172 |
{ |
1173 |
int ret;
|
1174 |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
1175 |
cb(opaque, ret); |
1176 |
return NULL; |
1177 |
} |
1178 |
|
1179 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
1180 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
1181 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1182 |
{ |
1183 |
int ret;
|
1184 |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
1185 |
cb(opaque, ret); |
1186 |
return NULL; |
1187 |
} |
1188 |
|
1189 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb) |
1190 |
{ |
1191 |
} |
1192 |
#else
|
1193 |
static void bdrv_aio_bh_cb(void *opaque) |
1194 |
{ |
1195 |
BlockDriverAIOCBSync *acb = opaque; |
1196 |
acb->common.cb(acb->common.opaque, acb->ret); |
1197 |
qemu_aio_release(acb); |
1198 |
} |
1199 |
|
1200 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
1201 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
1202 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1203 |
{ |
1204 |
BlockDriverAIOCBSync *acb; |
1205 |
int ret;
|
1206 |
|
1207 |
acb = qemu_aio_get(bs, cb, opaque); |
1208 |
if (!acb->bh)
|
1209 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1210 |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
1211 |
acb->ret = ret; |
1212 |
qemu_bh_schedule(acb->bh); |
1213 |
return &acb->common;
|
1214 |
} |
1215 |
|
1216 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
1217 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
1218 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1219 |
{ |
1220 |
BlockDriverAIOCBSync *acb; |
1221 |
int ret;
|
1222 |
|
1223 |
acb = qemu_aio_get(bs, cb, opaque); |
1224 |
if (!acb->bh)
|
1225 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1226 |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
1227 |
acb->ret = ret; |
1228 |
qemu_bh_schedule(acb->bh); |
1229 |
return &acb->common;
|
1230 |
} |
1231 |
|
1232 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
1233 |
{ |
1234 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1235 |
qemu_bh_cancel(acb->bh); |
1236 |
qemu_aio_release(acb); |
1237 |
} |
1238 |
#endif /* !QEMU_IMG */ |
1239 |
|
1240 |
/**************************************************************/
|
1241 |
/* sync block device emulation */
|
1242 |
|
1243 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
1244 |
{ |
1245 |
*(int *)opaque = ret;
|
1246 |
} |
1247 |
|
1248 |
#define NOT_DONE 0x7fffffff |
1249 |
|
1250 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
1251 |
uint8_t *buf, int nb_sectors)
|
1252 |
{ |
1253 |
int async_ret;
|
1254 |
BlockDriverAIOCB *acb; |
1255 |
|
1256 |
async_ret = NOT_DONE; |
1257 |
qemu_aio_wait_start(); |
1258 |
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
1259 |
bdrv_rw_em_cb, &async_ret); |
1260 |
if (acb == NULL) { |
1261 |
qemu_aio_wait_end(); |
1262 |
return -1; |
1263 |
} |
1264 |
while (async_ret == NOT_DONE) {
|
1265 |
qemu_aio_wait(); |
1266 |
} |
1267 |
qemu_aio_wait_end(); |
1268 |
return async_ret;
|
1269 |
} |
1270 |
|
1271 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1272 |
const uint8_t *buf, int nb_sectors) |
1273 |
{ |
1274 |
int async_ret;
|
1275 |
BlockDriverAIOCB *acb; |
1276 |
|
1277 |
async_ret = NOT_DONE; |
1278 |
qemu_aio_wait_start(); |
1279 |
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
1280 |
bdrv_rw_em_cb, &async_ret); |
1281 |
if (acb == NULL) { |
1282 |
qemu_aio_wait_end(); |
1283 |
return -1; |
1284 |
} |
1285 |
while (async_ret == NOT_DONE) {
|
1286 |
qemu_aio_wait(); |
1287 |
} |
1288 |
qemu_aio_wait_end(); |
1289 |
return async_ret;
|
1290 |
} |
1291 |
|
1292 |
void bdrv_init(void) |
1293 |
{ |
1294 |
bdrv_register(&bdrv_raw); |
1295 |
bdrv_register(&bdrv_host_device); |
1296 |
#ifndef _WIN32
|
1297 |
bdrv_register(&bdrv_cow); |
1298 |
#endif
|
1299 |
bdrv_register(&bdrv_qcow); |
1300 |
bdrv_register(&bdrv_vmdk); |
1301 |
bdrv_register(&bdrv_cloop); |
1302 |
bdrv_register(&bdrv_dmg); |
1303 |
bdrv_register(&bdrv_bochs); |
1304 |
bdrv_register(&bdrv_vpc); |
1305 |
bdrv_register(&bdrv_vvfat); |
1306 |
bdrv_register(&bdrv_qcow2); |
1307 |
bdrv_register(&bdrv_parallels); |
1308 |
} |
1309 |
|
1310 |
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
|
1311 |
void *opaque)
|
1312 |
{ |
1313 |
BlockDriver *drv; |
1314 |
BlockDriverAIOCB *acb; |
1315 |
|
1316 |
drv = bs->drv; |
1317 |
if (drv->free_aiocb) {
|
1318 |
acb = drv->free_aiocb; |
1319 |
drv->free_aiocb = acb->next; |
1320 |
} else {
|
1321 |
acb = qemu_mallocz(drv->aiocb_size); |
1322 |
if (!acb)
|
1323 |
return NULL; |
1324 |
} |
1325 |
acb->bs = bs; |
1326 |
acb->cb = cb; |
1327 |
acb->opaque = opaque; |
1328 |
return acb;
|
1329 |
} |
1330 |
|
1331 |
void qemu_aio_release(void *p) |
1332 |
{ |
1333 |
BlockDriverAIOCB *acb = p; |
1334 |
BlockDriver *drv = acb->bs->drv; |
1335 |
acb->next = drv->free_aiocb; |
1336 |
drv->free_aiocb = acb; |
1337 |
} |
1338 |
|
1339 |
/**************************************************************/
|
1340 |
/* removable device support */
|
1341 |
|
1342 |
/**
|
1343 |
* Return TRUE if the media is present
|
1344 |
*/
|
1345 |
int bdrv_is_inserted(BlockDriverState *bs)
|
1346 |
{ |
1347 |
BlockDriver *drv = bs->drv; |
1348 |
int ret;
|
1349 |
if (!drv)
|
1350 |
return 0; |
1351 |
if (!drv->bdrv_is_inserted)
|
1352 |
return 1; |
1353 |
ret = drv->bdrv_is_inserted(bs); |
1354 |
return ret;
|
1355 |
} |
1356 |
|
1357 |
/**
|
1358 |
* Return TRUE if the media changed since the last call to this
|
1359 |
* function. It is currently only used for floppy disks
|
1360 |
*/
|
1361 |
int bdrv_media_changed(BlockDriverState *bs)
|
1362 |
{ |
1363 |
BlockDriver *drv = bs->drv; |
1364 |
int ret;
|
1365 |
|
1366 |
if (!drv || !drv->bdrv_media_changed)
|
1367 |
ret = -ENOTSUP; |
1368 |
else
|
1369 |
ret = drv->bdrv_media_changed(bs); |
1370 |
if (ret == -ENOTSUP)
|
1371 |
ret = bs->media_changed; |
1372 |
bs->media_changed = 0;
|
1373 |
return ret;
|
1374 |
} |
1375 |
|
1376 |
/**
|
1377 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
1378 |
*/
|
1379 |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
1380 |
{ |
1381 |
BlockDriver *drv = bs->drv; |
1382 |
int ret;
|
1383 |
|
1384 |
if (!drv || !drv->bdrv_eject) {
|
1385 |
ret = -ENOTSUP; |
1386 |
} else {
|
1387 |
ret = drv->bdrv_eject(bs, eject_flag); |
1388 |
} |
1389 |
if (ret == -ENOTSUP) {
|
1390 |
if (eject_flag)
|
1391 |
bdrv_close(bs); |
1392 |
} |
1393 |
} |
1394 |
|
1395 |
int bdrv_is_locked(BlockDriverState *bs)
|
1396 |
{ |
1397 |
return bs->locked;
|
1398 |
} |
1399 |
|
1400 |
/**
|
1401 |
* Lock or unlock the media (if it is locked, the user won't be able
|
1402 |
* to eject it manually).
|
1403 |
*/
|
1404 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
1405 |
{ |
1406 |
BlockDriver *drv = bs->drv; |
1407 |
|
1408 |
bs->locked = locked; |
1409 |
if (drv && drv->bdrv_set_locked) {
|
1410 |
drv->bdrv_set_locked(bs, locked); |
1411 |
} |
1412 |
} |
1413 |
|
1414 |
/* needed for generic scsi interface */
|
1415 |
|
1416 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
1417 |
{ |
1418 |
BlockDriver *drv = bs->drv; |
1419 |
|
1420 |
if (drv && drv->bdrv_ioctl)
|
1421 |
return drv->bdrv_ioctl(bs, req, buf);
|
1422 |
return -ENOTSUP;
|
1423 |
} |