root / block.c @ 71d0770c
History | View | Annotate | Download (43.5 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 "config-host.h" |
| 25 |
#ifdef _BSD
|
| 26 |
/* include native header before sys-queue.h */
|
| 27 |
#include <sys/queue.h> |
| 28 |
#endif
|
| 29 |
|
| 30 |
#include "qemu-common.h" |
| 31 |
#include "console.h" |
| 32 |
#include "block_int.h" |
| 33 |
|
| 34 |
#ifdef _BSD
|
| 35 |
#include <sys/types.h> |
| 36 |
#include <sys/stat.h> |
| 37 |
#include <sys/ioctl.h> |
| 38 |
#include <sys/disk.h> |
| 39 |
#endif
|
| 40 |
|
| 41 |
#define SECTOR_BITS 9 |
| 42 |
#define SECTOR_SIZE (1 << SECTOR_BITS) |
| 43 |
|
| 44 |
typedef struct BlockDriverAIOCBSync { |
| 45 |
BlockDriverAIOCB common; |
| 46 |
QEMUBH *bh; |
| 47 |
int ret;
|
| 48 |
} BlockDriverAIOCBSync; |
| 49 |
|
| 50 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
| 51 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
| 52 |
BlockDriverCompletionFunc *cb, void *opaque);
|
| 53 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
| 54 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
| 55 |
BlockDriverCompletionFunc *cb, void *opaque);
|
| 56 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
| 57 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 58 |
uint8_t *buf, int nb_sectors);
|
| 59 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 60 |
const uint8_t *buf, int nb_sectors); |
| 61 |
|
| 62 |
BlockDriverState *bdrv_first; |
| 63 |
|
| 64 |
static BlockDriver *first_drv;
|
| 65 |
|
| 66 |
int path_is_absolute(const char *path) |
| 67 |
{
|
| 68 |
const char *p; |
| 69 |
#ifdef _WIN32
|
| 70 |
/* specific case for names like: "\\.\d:" */
|
| 71 |
if (*path == '/' || *path == '\\') |
| 72 |
return 1; |
| 73 |
#endif
|
| 74 |
p = strchr(path, ':');
|
| 75 |
if (p)
|
| 76 |
p++; |
| 77 |
else
|
| 78 |
p = path; |
| 79 |
#ifdef _WIN32
|
| 80 |
return (*p == '/' || *p == '\\'); |
| 81 |
#else
|
| 82 |
return (*p == '/'); |
| 83 |
#endif
|
| 84 |
} |
| 85 |
|
| 86 |
/* if filename is absolute, just copy it to dest. Otherwise, build a
|
| 87 |
path to it by considering it is relative to base_path. URL are
|
| 88 |
supported. */
|
| 89 |
void path_combine(char *dest, int dest_size, |
| 90 |
const char *base_path, |
| 91 |
const char *filename) |
| 92 |
{
|
| 93 |
const char *p, *p1; |
| 94 |
int len;
|
| 95 |
|
| 96 |
if (dest_size <= 0) |
| 97 |
return;
|
| 98 |
if (path_is_absolute(filename)) {
|
| 99 |
pstrcpy(dest, dest_size, filename); |
| 100 |
} else {
|
| 101 |
p = strchr(base_path, ':');
|
| 102 |
if (p)
|
| 103 |
p++; |
| 104 |
else
|
| 105 |
p = base_path; |
| 106 |
p1 = strrchr(base_path, '/');
|
| 107 |
#ifdef _WIN32
|
| 108 |
{
|
| 109 |
const char *p2; |
| 110 |
p2 = strrchr(base_path, '\\');
|
| 111 |
if (!p1 || p2 > p1)
|
| 112 |
p1 = p2; |
| 113 |
} |
| 114 |
#endif
|
| 115 |
if (p1)
|
| 116 |
p1++; |
| 117 |
else
|
| 118 |
p1 = base_path; |
| 119 |
if (p1 > p)
|
| 120 |
p = p1; |
| 121 |
len = p - base_path; |
| 122 |
if (len > dest_size - 1) |
| 123 |
len = dest_size - 1;
|
| 124 |
memcpy(dest, base_path, len); |
| 125 |
dest[len] = '\0';
|
| 126 |
pstrcat(dest, dest_size, filename); |
| 127 |
} |
| 128 |
} |
| 129 |
|
| 130 |
|
| 131 |
static void bdrv_register(BlockDriver *bdrv) |
| 132 |
{
|
| 133 |
if (!bdrv->bdrv_aio_read) {
|
| 134 |
/* add AIO emulation layer */
|
| 135 |
bdrv->bdrv_aio_read = bdrv_aio_read_em; |
| 136 |
bdrv->bdrv_aio_write = bdrv_aio_write_em; |
| 137 |
bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
| 138 |
bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
|
| 139 |
} else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
| 140 |
/* add synchronous IO emulation layer */
|
| 141 |
bdrv->bdrv_read = bdrv_read_em; |
| 142 |
bdrv->bdrv_write = bdrv_write_em; |
| 143 |
} |
| 144 |
bdrv->next = first_drv; |
| 145 |
first_drv = bdrv; |
| 146 |
} |
| 147 |
|
| 148 |
/* create a new block device (by default it is empty) */
|
| 149 |
BlockDriverState *bdrv_new(const char *device_name) |
| 150 |
{
|
| 151 |
BlockDriverState **pbs, *bs; |
| 152 |
|
| 153 |
bs = qemu_mallocz(sizeof(BlockDriverState));
|
| 154 |
pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
|
| 155 |
if (device_name[0] != '\0') { |
| 156 |
/* insert at the end */
|
| 157 |
pbs = &bdrv_first; |
| 158 |
while (*pbs != NULL) |
| 159 |
pbs = &(*pbs)->next; |
| 160 |
*pbs = bs; |
| 161 |
} |
| 162 |
return bs;
|
| 163 |
} |
| 164 |
|
| 165 |
BlockDriver *bdrv_find_format(const char *format_name) |
| 166 |
{
|
| 167 |
BlockDriver *drv1; |
| 168 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 169 |
if (!strcmp(drv1->format_name, format_name))
|
| 170 |
return drv1;
|
| 171 |
} |
| 172 |
return NULL; |
| 173 |
} |
| 174 |
|
| 175 |
int bdrv_create(BlockDriver *drv,
|
| 176 |
const char *filename, int64_t size_in_sectors, |
| 177 |
const char *backing_file, int flags) |
| 178 |
{
|
| 179 |
if (!drv->bdrv_create)
|
| 180 |
return -ENOTSUP;
|
| 181 |
return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
|
| 182 |
} |
| 183 |
|
| 184 |
#ifdef _WIN32
|
| 185 |
void get_tmp_filename(char *filename, int size) |
| 186 |
{
|
| 187 |
char temp_dir[MAX_PATH];
|
| 188 |
|
| 189 |
GetTempPath(MAX_PATH, temp_dir); |
| 190 |
GetTempFileName(temp_dir, "qem", 0, filename); |
| 191 |
} |
| 192 |
#else
|
| 193 |
void get_tmp_filename(char *filename, int size) |
| 194 |
{
|
| 195 |
int fd;
|
| 196 |
const char *tmpdir; |
| 197 |
/* XXX: race condition possible */
|
| 198 |
tmpdir = getenv("TMPDIR");
|
| 199 |
if (!tmpdir)
|
| 200 |
tmpdir = "/tmp";
|
| 201 |
snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
|
| 202 |
fd = mkstemp(filename); |
| 203 |
close(fd); |
| 204 |
} |
| 205 |
#endif
|
| 206 |
|
| 207 |
#ifdef _WIN32
|
| 208 |
static int is_windows_drive_prefix(const char *filename) |
| 209 |
{
|
| 210 |
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 211 |
(filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 212 |
filename[1] == ':'); |
| 213 |
} |
| 214 |
|
| 215 |
static int is_windows_drive(const char *filename) |
| 216 |
{
|
| 217 |
if (is_windows_drive_prefix(filename) &&
|
| 218 |
filename[2] == '\0') |
| 219 |
return 1; |
| 220 |
if (strstart(filename, "\\\\.\\", NULL) || |
| 221 |
strstart(filename, "//./", NULL)) |
| 222 |
return 1; |
| 223 |
return 0; |
| 224 |
} |
| 225 |
#endif
|
| 226 |
|
| 227 |
static BlockDriver *find_protocol(const char *filename) |
| 228 |
{
|
| 229 |
BlockDriver *drv1; |
| 230 |
char protocol[128]; |
| 231 |
int len;
|
| 232 |
const char *p; |
| 233 |
|
| 234 |
#ifdef _WIN32
|
| 235 |
if (is_windows_drive(filename) ||
|
| 236 |
is_windows_drive_prefix(filename)) |
| 237 |
return &bdrv_raw;
|
| 238 |
#endif
|
| 239 |
p = strchr(filename, ':');
|
| 240 |
if (!p)
|
| 241 |
return &bdrv_raw;
|
| 242 |
len = p - filename; |
| 243 |
if (len > sizeof(protocol) - 1) |
| 244 |
len = sizeof(protocol) - 1; |
| 245 |
memcpy(protocol, filename, len); |
| 246 |
protocol[len] = '\0';
|
| 247 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 248 |
if (drv1->protocol_name &&
|
| 249 |
!strcmp(drv1->protocol_name, protocol)) |
| 250 |
return drv1;
|
| 251 |
} |
| 252 |
return NULL; |
| 253 |
} |
| 254 |
|
| 255 |
/* XXX: force raw format if block or character device ? It would
|
| 256 |
simplify the BSD case */
|
| 257 |
static BlockDriver *find_image_format(const char *filename) |
| 258 |
{
|
| 259 |
int ret, score, score_max;
|
| 260 |
BlockDriver *drv1, *drv; |
| 261 |
uint8_t buf[2048];
|
| 262 |
BlockDriverState *bs; |
| 263 |
|
| 264 |
/* detect host devices. By convention, /dev/cdrom[N] is always
|
| 265 |
recognized as a host CDROM */
|
| 266 |
if (strstart(filename, "/dev/cdrom", NULL)) |
| 267 |
return &bdrv_host_device;
|
| 268 |
#ifdef _WIN32
|
| 269 |
if (is_windows_drive(filename))
|
| 270 |
return &bdrv_host_device;
|
| 271 |
#else
|
| 272 |
{
|
| 273 |
struct stat st;
|
| 274 |
if (stat(filename, &st) >= 0 && |
| 275 |
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
|
| 276 |
return &bdrv_host_device;
|
| 277 |
} |
| 278 |
} |
| 279 |
#endif
|
| 280 |
|
| 281 |
drv = find_protocol(filename); |
| 282 |
/* no need to test disk image formats for vvfat */
|
| 283 |
if (drv == &bdrv_vvfat)
|
| 284 |
return drv;
|
| 285 |
|
| 286 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
| 287 |
if (ret < 0) |
| 288 |
return NULL; |
| 289 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
| 290 |
bdrv_delete(bs); |
| 291 |
if (ret < 0) { |
| 292 |
return NULL; |
| 293 |
} |
| 294 |
|
| 295 |
score_max = 0;
|
| 296 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 297 |
if (drv1->bdrv_probe) {
|
| 298 |
score = drv1->bdrv_probe(buf, ret, filename); |
| 299 |
if (score > score_max) {
|
| 300 |
score_max = score; |
| 301 |
drv = drv1; |
| 302 |
} |
| 303 |
} |
| 304 |
} |
| 305 |
return drv;
|
| 306 |
} |
| 307 |
|
| 308 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
| 309 |
{
|
| 310 |
BlockDriverState *bs; |
| 311 |
int ret;
|
| 312 |
|
| 313 |
bs = bdrv_new("");
|
| 314 |
if (!bs)
|
| 315 |
return -ENOMEM;
|
| 316 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
| 317 |
if (ret < 0) { |
| 318 |
bdrv_delete(bs); |
| 319 |
return ret;
|
| 320 |
} |
| 321 |
bs->growable = 1;
|
| 322 |
*pbs = bs; |
| 323 |
return 0; |
| 324 |
} |
| 325 |
|
| 326 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
| 327 |
{
|
| 328 |
return bdrv_open2(bs, filename, flags, NULL); |
| 329 |
} |
| 330 |
|
| 331 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
| 332 |
BlockDriver *drv) |
| 333 |
{
|
| 334 |
int ret, open_flags;
|
| 335 |
char tmp_filename[PATH_MAX];
|
| 336 |
char backing_filename[PATH_MAX];
|
| 337 |
|
| 338 |
bs->read_only = 0;
|
| 339 |
bs->is_temporary = 0;
|
| 340 |
bs->encrypted = 0;
|
| 341 |
|
| 342 |
if (flags & BDRV_O_SNAPSHOT) {
|
| 343 |
BlockDriverState *bs1; |
| 344 |
int64_t total_size; |
| 345 |
int is_protocol = 0; |
| 346 |
|
| 347 |
/* if snapshot, we create a temporary backing file and open it
|
| 348 |
instead of opening 'filename' directly */
|
| 349 |
|
| 350 |
/* if there is a backing file, use it */
|
| 351 |
bs1 = bdrv_new("");
|
| 352 |
if (!bs1) {
|
| 353 |
return -ENOMEM;
|
| 354 |
} |
| 355 |
if (bdrv_open(bs1, filename, 0) < 0) { |
| 356 |
bdrv_delete(bs1); |
| 357 |
return -1; |
| 358 |
} |
| 359 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
| 360 |
|
| 361 |
if (bs1->drv && bs1->drv->protocol_name)
|
| 362 |
is_protocol = 1;
|
| 363 |
|
| 364 |
bdrv_delete(bs1); |
| 365 |
|
| 366 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
| 367 |
|
| 368 |
/* Real path is meaningless for protocols */
|
| 369 |
if (is_protocol)
|
| 370 |
snprintf(backing_filename, sizeof(backing_filename),
|
| 371 |
"%s", filename);
|
| 372 |
else
|
| 373 |
realpath(filename, backing_filename); |
| 374 |
|
| 375 |
if (bdrv_create(&bdrv_qcow2, tmp_filename,
|
| 376 |
total_size, backing_filename, 0) < 0) { |
| 377 |
return -1; |
| 378 |
} |
| 379 |
filename = tmp_filename; |
| 380 |
bs->is_temporary = 1;
|
| 381 |
} |
| 382 |
|
| 383 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
| 384 |
if (flags & BDRV_O_FILE) {
|
| 385 |
drv = find_protocol(filename); |
| 386 |
if (!drv)
|
| 387 |
return -ENOENT;
|
| 388 |
} else {
|
| 389 |
if (!drv) {
|
| 390 |
drv = find_image_format(filename); |
| 391 |
if (!drv)
|
| 392 |
return -1; |
| 393 |
} |
| 394 |
} |
| 395 |
bs->drv = drv; |
| 396 |
bs->opaque = qemu_mallocz(drv->instance_size); |
| 397 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
| 398 |
RDONLY as fallback */
|
| 399 |
if (!(flags & BDRV_O_FILE))
|
| 400 |
open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK); |
| 401 |
else
|
| 402 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
| 403 |
ret = drv->bdrv_open(bs, filename, open_flags); |
| 404 |
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
| 405 |
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
| 406 |
bs->read_only = 1;
|
| 407 |
} |
| 408 |
if (ret < 0) { |
| 409 |
qemu_free(bs->opaque); |
| 410 |
bs->opaque = NULL;
|
| 411 |
bs->drv = NULL;
|
| 412 |
return ret;
|
| 413 |
} |
| 414 |
if (drv->bdrv_getlength) {
|
| 415 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
| 416 |
} |
| 417 |
#ifndef _WIN32
|
| 418 |
if (bs->is_temporary) {
|
| 419 |
unlink(filename); |
| 420 |
} |
| 421 |
#endif
|
| 422 |
if (bs->backing_file[0] != '\0') { |
| 423 |
/* if there is a backing file, use it */
|
| 424 |
bs->backing_hd = bdrv_new("");
|
| 425 |
if (!bs->backing_hd) {
|
| 426 |
fail:
|
| 427 |
bdrv_close(bs); |
| 428 |
return -ENOMEM;
|
| 429 |
} |
| 430 |
path_combine(backing_filename, sizeof(backing_filename),
|
| 431 |
filename, bs->backing_file); |
| 432 |
if (bdrv_open(bs->backing_hd, backing_filename, open_flags) < 0) |
| 433 |
goto fail;
|
| 434 |
} |
| 435 |
|
| 436 |
/* call the change callback */
|
| 437 |
bs->media_changed = 1;
|
| 438 |
if (bs->change_cb)
|
| 439 |
bs->change_cb(bs->change_opaque); |
| 440 |
|
| 441 |
return 0; |
| 442 |
} |
| 443 |
|
| 444 |
void bdrv_close(BlockDriverState *bs)
|
| 445 |
{
|
| 446 |
if (bs->drv) {
|
| 447 |
if (bs->backing_hd)
|
| 448 |
bdrv_delete(bs->backing_hd); |
| 449 |
bs->drv->bdrv_close(bs); |
| 450 |
qemu_free(bs->opaque); |
| 451 |
#ifdef _WIN32
|
| 452 |
if (bs->is_temporary) {
|
| 453 |
unlink(bs->filename); |
| 454 |
} |
| 455 |
#endif
|
| 456 |
bs->opaque = NULL;
|
| 457 |
bs->drv = NULL;
|
| 458 |
|
| 459 |
/* call the change callback */
|
| 460 |
bs->media_changed = 1;
|
| 461 |
if (bs->change_cb)
|
| 462 |
bs->change_cb(bs->change_opaque); |
| 463 |
} |
| 464 |
} |
| 465 |
|
| 466 |
void bdrv_delete(BlockDriverState *bs)
|
| 467 |
{
|
| 468 |
BlockDriverState **pbs; |
| 469 |
|
| 470 |
pbs = &bdrv_first; |
| 471 |
while (*pbs != bs && *pbs != NULL) |
| 472 |
pbs = &(*pbs)->next; |
| 473 |
if (*pbs == bs)
|
| 474 |
*pbs = bs->next; |
| 475 |
|
| 476 |
bdrv_close(bs); |
| 477 |
qemu_free(bs); |
| 478 |
} |
| 479 |
|
| 480 |
/* commit COW file into the raw image */
|
| 481 |
int bdrv_commit(BlockDriverState *bs)
|
| 482 |
{
|
| 483 |
BlockDriver *drv = bs->drv; |
| 484 |
int64_t i, total_sectors; |
| 485 |
int n, j;
|
| 486 |
unsigned char sector[512]; |
| 487 |
|
| 488 |
if (!drv)
|
| 489 |
return -ENOMEDIUM;
|
| 490 |
|
| 491 |
if (bs->read_only) {
|
| 492 |
return -EACCES;
|
| 493 |
} |
| 494 |
|
| 495 |
if (!bs->backing_hd) {
|
| 496 |
return -ENOTSUP;
|
| 497 |
} |
| 498 |
|
| 499 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
| 500 |
for (i = 0; i < total_sectors;) { |
| 501 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
| 502 |
for(j = 0; j < n; j++) { |
| 503 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
| 504 |
return -EIO;
|
| 505 |
} |
| 506 |
|
| 507 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
| 508 |
return -EIO;
|
| 509 |
} |
| 510 |
i++; |
| 511 |
} |
| 512 |
} else {
|
| 513 |
i += n; |
| 514 |
} |
| 515 |
} |
| 516 |
|
| 517 |
if (drv->bdrv_make_empty)
|
| 518 |
return drv->bdrv_make_empty(bs);
|
| 519 |
|
| 520 |
return 0; |
| 521 |
} |
| 522 |
|
| 523 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
| 524 |
size_t size) |
| 525 |
{
|
| 526 |
int64_t len; |
| 527 |
|
| 528 |
if (!bdrv_is_inserted(bs))
|
| 529 |
return -ENOMEDIUM;
|
| 530 |
|
| 531 |
if (bs->growable)
|
| 532 |
return 0; |
| 533 |
|
| 534 |
len = bdrv_getlength(bs); |
| 535 |
|
| 536 |
if ((offset + size) > len)
|
| 537 |
return -EIO;
|
| 538 |
|
| 539 |
return 0; |
| 540 |
} |
| 541 |
|
| 542 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
| 543 |
int nb_sectors)
|
| 544 |
{
|
| 545 |
int64_t offset; |
| 546 |
|
| 547 |
/* Deal with byte accesses */
|
| 548 |
if (sector_num < 0) |
| 549 |
offset = -sector_num; |
| 550 |
else
|
| 551 |
offset = sector_num * 512;
|
| 552 |
|
| 553 |
return bdrv_check_byte_request(bs, offset, nb_sectors * 512); |
| 554 |
} |
| 555 |
|
| 556 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
| 557 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
| 558 |
uint8_t *buf, int nb_sectors)
|
| 559 |
{
|
| 560 |
BlockDriver *drv = bs->drv; |
| 561 |
|
| 562 |
if (!drv)
|
| 563 |
return -ENOMEDIUM;
|
| 564 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 565 |
return -EIO;
|
| 566 |
|
| 567 |
if (drv->bdrv_pread) {
|
| 568 |
int ret, len;
|
| 569 |
len = nb_sectors * 512;
|
| 570 |
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
|
| 571 |
if (ret < 0) |
| 572 |
return ret;
|
| 573 |
else if (ret != len) |
| 574 |
return -EINVAL;
|
| 575 |
else {
|
| 576 |
bs->rd_bytes += (unsigned) len;
|
| 577 |
bs->rd_ops ++; |
| 578 |
return 0; |
| 579 |
} |
| 580 |
} else {
|
| 581 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
| 582 |
} |
| 583 |
} |
| 584 |
|
| 585 |
/* Return < 0 if error. Important errors are:
|
| 586 |
-EIO generic I/O error (may happen for all errors)
|
| 587 |
-ENOMEDIUM No media inserted.
|
| 588 |
-EINVAL Invalid sector number or nb_sectors
|
| 589 |
-EACCES Trying to write a read-only device
|
| 590 |
*/
|
| 591 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
| 592 |
const uint8_t *buf, int nb_sectors) |
| 593 |
{
|
| 594 |
BlockDriver *drv = bs->drv; |
| 595 |
if (!bs->drv)
|
| 596 |
return -ENOMEDIUM;
|
| 597 |
if (bs->read_only)
|
| 598 |
return -EACCES;
|
| 599 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 600 |
return -EIO;
|
| 601 |
|
| 602 |
if (drv->bdrv_pwrite) {
|
| 603 |
int ret, len, count = 0; |
| 604 |
len = nb_sectors * 512;
|
| 605 |
do {
|
| 606 |
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len - count);
|
| 607 |
if (ret < 0) { |
| 608 |
printf("bdrv_write ret=%d\n", ret);
|
| 609 |
return ret;
|
| 610 |
} |
| 611 |
count += ret; |
| 612 |
buf += ret; |
| 613 |
} while (count != len);
|
| 614 |
bs->wr_bytes += (unsigned) len;
|
| 615 |
bs->wr_ops ++; |
| 616 |
return 0; |
| 617 |
} |
| 618 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
| 619 |
} |
| 620 |
|
| 621 |
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
| 622 |
uint8_t *buf, int count1)
|
| 623 |
{
|
| 624 |
uint8_t tmp_buf[SECTOR_SIZE]; |
| 625 |
int len, nb_sectors, count;
|
| 626 |
int64_t sector_num; |
| 627 |
|
| 628 |
count = count1; |
| 629 |
/* first read to align to sector start */
|
| 630 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
| 631 |
if (len > count)
|
| 632 |
len = count; |
| 633 |
sector_num = offset >> SECTOR_BITS; |
| 634 |
if (len > 0) { |
| 635 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 636 |
return -EIO;
|
| 637 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
| 638 |
count -= len; |
| 639 |
if (count == 0) |
| 640 |
return count1;
|
| 641 |
sector_num++; |
| 642 |
buf += len; |
| 643 |
} |
| 644 |
|
| 645 |
/* read the sectors "in place" */
|
| 646 |
nb_sectors = count >> SECTOR_BITS; |
| 647 |
if (nb_sectors > 0) { |
| 648 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
| 649 |
return -EIO;
|
| 650 |
sector_num += nb_sectors; |
| 651 |
len = nb_sectors << SECTOR_BITS; |
| 652 |
buf += len; |
| 653 |
count -= len; |
| 654 |
} |
| 655 |
|
| 656 |
/* add data from the last sector */
|
| 657 |
if (count > 0) { |
| 658 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 659 |
return -EIO;
|
| 660 |
memcpy(buf, tmp_buf, count); |
| 661 |
} |
| 662 |
return count1;
|
| 663 |
} |
| 664 |
|
| 665 |
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
| 666 |
const uint8_t *buf, int count1) |
| 667 |
{
|
| 668 |
uint8_t tmp_buf[SECTOR_SIZE]; |
| 669 |
int len, nb_sectors, count;
|
| 670 |
int64_t sector_num; |
| 671 |
|
| 672 |
count = count1; |
| 673 |
/* first write to align to sector start */
|
| 674 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
| 675 |
if (len > count)
|
| 676 |
len = count; |
| 677 |
sector_num = offset >> SECTOR_BITS; |
| 678 |
if (len > 0) { |
| 679 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 680 |
return -EIO;
|
| 681 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
| 682 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 683 |
return -EIO;
|
| 684 |
count -= len; |
| 685 |
if (count == 0) |
| 686 |
return count1;
|
| 687 |
sector_num++; |
| 688 |
buf += len; |
| 689 |
} |
| 690 |
|
| 691 |
/* write the sectors "in place" */
|
| 692 |
nb_sectors = count >> SECTOR_BITS; |
| 693 |
if (nb_sectors > 0) { |
| 694 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
| 695 |
return -EIO;
|
| 696 |
sector_num += nb_sectors; |
| 697 |
len = nb_sectors << SECTOR_BITS; |
| 698 |
buf += len; |
| 699 |
count -= len; |
| 700 |
} |
| 701 |
|
| 702 |
/* add data from the last sector */
|
| 703 |
if (count > 0) { |
| 704 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 705 |
return -EIO;
|
| 706 |
memcpy(tmp_buf, buf, count); |
| 707 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 708 |
return -EIO;
|
| 709 |
} |
| 710 |
return count1;
|
| 711 |
} |
| 712 |
|
| 713 |
/**
|
| 714 |
* Read with byte offsets (needed only for file protocols)
|
| 715 |
*/
|
| 716 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
| 717 |
void *buf1, int count1) |
| 718 |
{
|
| 719 |
BlockDriver *drv = bs->drv; |
| 720 |
|
| 721 |
if (!drv)
|
| 722 |
return -ENOMEDIUM;
|
| 723 |
if (bdrv_check_byte_request(bs, offset, count1))
|
| 724 |
return -EIO;
|
| 725 |
|
| 726 |
if (!drv->bdrv_pread)
|
| 727 |
return bdrv_pread_em(bs, offset, buf1, count1);
|
| 728 |
return drv->bdrv_pread(bs, offset, buf1, count1);
|
| 729 |
} |
| 730 |
|
| 731 |
/**
|
| 732 |
* Write with byte offsets (needed only for file protocols)
|
| 733 |
*/
|
| 734 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
| 735 |
const void *buf1, int count1) |
| 736 |
{
|
| 737 |
BlockDriver *drv = bs->drv; |
| 738 |
|
| 739 |
if (!drv)
|
| 740 |
return -ENOMEDIUM;
|
| 741 |
if (bdrv_check_byte_request(bs, offset, count1))
|
| 742 |
return -EIO;
|
| 743 |
|
| 744 |
if (!drv->bdrv_pwrite)
|
| 745 |
return bdrv_pwrite_em(bs, offset, buf1, count1);
|
| 746 |
return drv->bdrv_pwrite(bs, offset, buf1, count1);
|
| 747 |
} |
| 748 |
|
| 749 |
/**
|
| 750 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
| 751 |
*/
|
| 752 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
| 753 |
{
|
| 754 |
BlockDriver *drv = bs->drv; |
| 755 |
if (!drv)
|
| 756 |
return -ENOMEDIUM;
|
| 757 |
if (!drv->bdrv_truncate)
|
| 758 |
return -ENOTSUP;
|
| 759 |
return drv->bdrv_truncate(bs, offset);
|
| 760 |
} |
| 761 |
|
| 762 |
/**
|
| 763 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
| 764 |
*/
|
| 765 |
int64_t bdrv_getlength(BlockDriverState *bs) |
| 766 |
{
|
| 767 |
BlockDriver *drv = bs->drv; |
| 768 |
if (!drv)
|
| 769 |
return -ENOMEDIUM;
|
| 770 |
if (!drv->bdrv_getlength) {
|
| 771 |
/* legacy mode */
|
| 772 |
return bs->total_sectors * SECTOR_SIZE;
|
| 773 |
} |
| 774 |
return drv->bdrv_getlength(bs);
|
| 775 |
} |
| 776 |
|
| 777 |
/* return 0 as number of sectors if no device present or error */
|
| 778 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
| 779 |
{
|
| 780 |
int64_t length; |
| 781 |
length = bdrv_getlength(bs); |
| 782 |
if (length < 0) |
| 783 |
length = 0;
|
| 784 |
else
|
| 785 |
length = length >> SECTOR_BITS; |
| 786 |
*nb_sectors_ptr = length; |
| 787 |
} |
| 788 |
|
| 789 |
struct partition {
|
| 790 |
uint8_t boot_ind; /* 0x80 - active */
|
| 791 |
uint8_t head; /* starting head */
|
| 792 |
uint8_t sector; /* starting sector */
|
| 793 |
uint8_t cyl; /* starting cylinder */
|
| 794 |
uint8_t sys_ind; /* What partition type */
|
| 795 |
uint8_t end_head; /* end head */
|
| 796 |
uint8_t end_sector; /* end sector */
|
| 797 |
uint8_t end_cyl; /* end cylinder */
|
| 798 |
uint32_t start_sect; /* starting sector counting from 0 */
|
| 799 |
uint32_t nr_sects; /* nr of sectors in partition */
|
| 800 |
} __attribute__((packed)); |
| 801 |
|
| 802 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
| 803 |
static int guess_disk_lchs(BlockDriverState *bs, |
| 804 |
int *pcylinders, int *pheads, int *psectors) |
| 805 |
{
|
| 806 |
uint8_t buf[512];
|
| 807 |
int ret, i, heads, sectors, cylinders;
|
| 808 |
struct partition *p;
|
| 809 |
uint32_t nr_sects; |
| 810 |
uint64_t nb_sectors; |
| 811 |
|
| 812 |
bdrv_get_geometry(bs, &nb_sectors); |
| 813 |
|
| 814 |
ret = bdrv_read(bs, 0, buf, 1); |
| 815 |
if (ret < 0) |
| 816 |
return -1; |
| 817 |
/* test msdos magic */
|
| 818 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
| 819 |
return -1; |
| 820 |
for(i = 0; i < 4; i++) { |
| 821 |
p = ((struct partition *)(buf + 0x1be)) + i; |
| 822 |
nr_sects = le32_to_cpu(p->nr_sects); |
| 823 |
if (nr_sects && p->end_head) {
|
| 824 |
/* We make the assumption that the partition terminates on
|
| 825 |
a cylinder boundary */
|
| 826 |
heads = p->end_head + 1;
|
| 827 |
sectors = p->end_sector & 63;
|
| 828 |
if (sectors == 0) |
| 829 |
continue;
|
| 830 |
cylinders = nb_sectors / (heads * sectors); |
| 831 |
if (cylinders < 1 || cylinders > 16383) |
| 832 |
continue;
|
| 833 |
*pheads = heads; |
| 834 |
*psectors = sectors; |
| 835 |
*pcylinders = cylinders; |
| 836 |
#if 0
|
| 837 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
| 838 |
cylinders, heads, sectors);
|
| 839 |
#endif
|
| 840 |
return 0; |
| 841 |
} |
| 842 |
} |
| 843 |
return -1; |
| 844 |
} |
| 845 |
|
| 846 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
| 847 |
{
|
| 848 |
int translation, lba_detected = 0; |
| 849 |
int cylinders, heads, secs;
|
| 850 |
uint64_t nb_sectors; |
| 851 |
|
| 852 |
/* if a geometry hint is available, use it */
|
| 853 |
bdrv_get_geometry(bs, &nb_sectors); |
| 854 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
| 855 |
translation = bdrv_get_translation_hint(bs); |
| 856 |
if (cylinders != 0) { |
| 857 |
*pcyls = cylinders; |
| 858 |
*pheads = heads; |
| 859 |
*psecs = secs; |
| 860 |
} else {
|
| 861 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
| 862 |
if (heads > 16) { |
| 863 |
/* if heads > 16, it means that a BIOS LBA
|
| 864 |
translation was active, so the default
|
| 865 |
hardware geometry is OK */
|
| 866 |
lba_detected = 1;
|
| 867 |
goto default_geometry;
|
| 868 |
} else {
|
| 869 |
*pcyls = cylinders; |
| 870 |
*pheads = heads; |
| 871 |
*psecs = secs; |
| 872 |
/* disable any translation to be in sync with
|
| 873 |
the logical geometry */
|
| 874 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
| 875 |
bdrv_set_translation_hint(bs, |
| 876 |
BIOS_ATA_TRANSLATION_NONE); |
| 877 |
} |
| 878 |
} |
| 879 |
} else {
|
| 880 |
default_geometry:
|
| 881 |
/* if no geometry, use a standard physical disk geometry */
|
| 882 |
cylinders = nb_sectors / (16 * 63); |
| 883 |
|
| 884 |
if (cylinders > 16383) |
| 885 |
cylinders = 16383;
|
| 886 |
else if (cylinders < 2) |
| 887 |
cylinders = 2;
|
| 888 |
*pcyls = cylinders; |
| 889 |
*pheads = 16;
|
| 890 |
*psecs = 63;
|
| 891 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
| 892 |
if ((*pcyls * *pheads) <= 131072) { |
| 893 |
bdrv_set_translation_hint(bs, |
| 894 |
BIOS_ATA_TRANSLATION_LARGE); |
| 895 |
} else {
|
| 896 |
bdrv_set_translation_hint(bs, |
| 897 |
BIOS_ATA_TRANSLATION_LBA); |
| 898 |
} |
| 899 |
} |
| 900 |
} |
| 901 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
| 902 |
} |
| 903 |
} |
| 904 |
|
| 905 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
| 906 |
int cyls, int heads, int secs) |
| 907 |
{
|
| 908 |
bs->cyls = cyls; |
| 909 |
bs->heads = heads; |
| 910 |
bs->secs = secs; |
| 911 |
} |
| 912 |
|
| 913 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
| 914 |
{
|
| 915 |
bs->type = type; |
| 916 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
| 917 |
type == BDRV_TYPE_FLOPPY)); |
| 918 |
} |
| 919 |
|
| 920 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
| 921 |
{
|
| 922 |
bs->translation = translation; |
| 923 |
} |
| 924 |
|
| 925 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
| 926 |
int *pcyls, int *pheads, int *psecs) |
| 927 |
{
|
| 928 |
*pcyls = bs->cyls; |
| 929 |
*pheads = bs->heads; |
| 930 |
*psecs = bs->secs; |
| 931 |
} |
| 932 |
|
| 933 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
| 934 |
{
|
| 935 |
return bs->type;
|
| 936 |
} |
| 937 |
|
| 938 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
| 939 |
{
|
| 940 |
return bs->translation;
|
| 941 |
} |
| 942 |
|
| 943 |
int bdrv_is_removable(BlockDriverState *bs)
|
| 944 |
{
|
| 945 |
return bs->removable;
|
| 946 |
} |
| 947 |
|
| 948 |
int bdrv_is_read_only(BlockDriverState *bs)
|
| 949 |
{
|
| 950 |
return bs->read_only;
|
| 951 |
} |
| 952 |
|
| 953 |
int bdrv_is_sg(BlockDriverState *bs)
|
| 954 |
{
|
| 955 |
return bs->sg;
|
| 956 |
} |
| 957 |
|
| 958 |
/* XXX: no longer used */
|
| 959 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
| 960 |
void (*change_cb)(void *opaque), void *opaque) |
| 961 |
{
|
| 962 |
bs->change_cb = change_cb; |
| 963 |
bs->change_opaque = opaque; |
| 964 |
} |
| 965 |
|
| 966 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
| 967 |
{
|
| 968 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 969 |
return 1; |
| 970 |
return bs->encrypted;
|
| 971 |
} |
| 972 |
|
| 973 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 974 |
{
|
| 975 |
int ret;
|
| 976 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
| 977 |
ret = bdrv_set_key(bs->backing_hd, key); |
| 978 |
if (ret < 0) |
| 979 |
return ret;
|
| 980 |
if (!bs->encrypted)
|
| 981 |
return 0; |
| 982 |
} |
| 983 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
| 984 |
return -1; |
| 985 |
return bs->drv->bdrv_set_key(bs, key);
|
| 986 |
} |
| 987 |
|
| 988 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
| 989 |
{
|
| 990 |
if (!bs->drv) {
|
| 991 |
buf[0] = '\0'; |
| 992 |
} else {
|
| 993 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
| 994 |
} |
| 995 |
} |
| 996 |
|
| 997 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
| 998 |
void *opaque)
|
| 999 |
{
|
| 1000 |
BlockDriver *drv; |
| 1001 |
|
| 1002 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
| 1003 |
it(opaque, drv->format_name); |
| 1004 |
} |
| 1005 |
} |
| 1006 |
|
| 1007 |
BlockDriverState *bdrv_find(const char *name) |
| 1008 |
{
|
| 1009 |
BlockDriverState *bs; |
| 1010 |
|
| 1011 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1012 |
if (!strcmp(name, bs->device_name))
|
| 1013 |
return bs;
|
| 1014 |
} |
| 1015 |
return NULL; |
| 1016 |
} |
| 1017 |
|
| 1018 |
void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
| 1019 |
{
|
| 1020 |
BlockDriverState *bs; |
| 1021 |
|
| 1022 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1023 |
it(opaque, bs->device_name); |
| 1024 |
} |
| 1025 |
} |
| 1026 |
|
| 1027 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
| 1028 |
{
|
| 1029 |
return bs->device_name;
|
| 1030 |
} |
| 1031 |
|
| 1032 |
void bdrv_flush(BlockDriverState *bs)
|
| 1033 |
{
|
| 1034 |
if (bs->drv->bdrv_flush)
|
| 1035 |
bs->drv->bdrv_flush(bs); |
| 1036 |
if (bs->backing_hd)
|
| 1037 |
bdrv_flush(bs->backing_hd); |
| 1038 |
} |
| 1039 |
|
| 1040 |
void bdrv_flush_all(void) |
| 1041 |
{
|
| 1042 |
BlockDriverState *bs; |
| 1043 |
|
| 1044 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
| 1045 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
| 1046 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
| 1047 |
bdrv_flush(bs); |
| 1048 |
} |
| 1049 |
|
| 1050 |
/*
|
| 1051 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
| 1052 |
* not implementing the functionality are assumed to not support backing files,
|
| 1053 |
* hence all their sectors are reported as allocated.
|
| 1054 |
*
|
| 1055 |
* 'pnum' is set to the number of sectors (including and immediately following
|
| 1056 |
* the specified sector) that are known to be in the same
|
| 1057 |
* allocated/unallocated state.
|
| 1058 |
*
|
| 1059 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
| 1060 |
*/
|
| 1061 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
| 1062 |
int *pnum)
|
| 1063 |
{
|
| 1064 |
int64_t n; |
| 1065 |
if (!bs->drv->bdrv_is_allocated) {
|
| 1066 |
if (sector_num >= bs->total_sectors) {
|
| 1067 |
*pnum = 0;
|
| 1068 |
return 0; |
| 1069 |
} |
| 1070 |
n = bs->total_sectors - sector_num; |
| 1071 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
| 1072 |
return 1; |
| 1073 |
} |
| 1074 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
| 1075 |
} |
| 1076 |
|
| 1077 |
void bdrv_info(void) |
| 1078 |
{
|
| 1079 |
BlockDriverState *bs; |
| 1080 |
|
| 1081 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1082 |
term_printf("%s:", bs->device_name);
|
| 1083 |
term_printf(" type=");
|
| 1084 |
switch(bs->type) {
|
| 1085 |
case BDRV_TYPE_HD:
|
| 1086 |
term_printf("hd");
|
| 1087 |
break;
|
| 1088 |
case BDRV_TYPE_CDROM:
|
| 1089 |
term_printf("cdrom");
|
| 1090 |
break;
|
| 1091 |
case BDRV_TYPE_FLOPPY:
|
| 1092 |
term_printf("floppy");
|
| 1093 |
break;
|
| 1094 |
} |
| 1095 |
term_printf(" removable=%d", bs->removable);
|
| 1096 |
if (bs->removable) {
|
| 1097 |
term_printf(" locked=%d", bs->locked);
|
| 1098 |
} |
| 1099 |
if (bs->drv) {
|
| 1100 |
term_printf(" file=");
|
| 1101 |
term_print_filename(bs->filename); |
| 1102 |
if (bs->backing_file[0] != '\0') { |
| 1103 |
term_printf(" backing_file=");
|
| 1104 |
term_print_filename(bs->backing_file); |
| 1105 |
} |
| 1106 |
term_printf(" ro=%d", bs->read_only);
|
| 1107 |
term_printf(" drv=%s", bs->drv->format_name);
|
| 1108 |
if (bs->encrypted)
|
| 1109 |
term_printf(" encrypted");
|
| 1110 |
} else {
|
| 1111 |
term_printf(" [not inserted]");
|
| 1112 |
} |
| 1113 |
term_printf("\n");
|
| 1114 |
} |
| 1115 |
} |
| 1116 |
|
| 1117 |
/* The "info blockstats" command. */
|
| 1118 |
void bdrv_info_stats (void) |
| 1119 |
{
|
| 1120 |
BlockDriverState *bs; |
| 1121 |
BlockDriverInfo bdi; |
| 1122 |
|
| 1123 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1124 |
term_printf ("%s:"
|
| 1125 |
" rd_bytes=%" PRIu64
|
| 1126 |
" wr_bytes=%" PRIu64
|
| 1127 |
" rd_operations=%" PRIu64
|
| 1128 |
" wr_operations=%" PRIu64
|
| 1129 |
, |
| 1130 |
bs->device_name, |
| 1131 |
bs->rd_bytes, bs->wr_bytes, |
| 1132 |
bs->rd_ops, bs->wr_ops); |
| 1133 |
if (bdrv_get_info(bs, &bdi) == 0) |
| 1134 |
term_printf(" high=%" PRId64
|
| 1135 |
" bytes_free=%" PRId64,
|
| 1136 |
bdi.highest_alloc, bdi.num_free_bytes); |
| 1137 |
term_printf("\n");
|
| 1138 |
} |
| 1139 |
} |
| 1140 |
|
| 1141 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
| 1142 |
char *filename, int filename_size) |
| 1143 |
{
|
| 1144 |
if (!bs->backing_hd) {
|
| 1145 |
pstrcpy(filename, filename_size, "");
|
| 1146 |
} else {
|
| 1147 |
pstrcpy(filename, filename_size, bs->backing_file); |
| 1148 |
} |
| 1149 |
} |
| 1150 |
|
| 1151 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
| 1152 |
const uint8_t *buf, int nb_sectors) |
| 1153 |
{
|
| 1154 |
BlockDriver *drv = bs->drv; |
| 1155 |
if (!drv)
|
| 1156 |
return -ENOMEDIUM;
|
| 1157 |
if (!drv->bdrv_write_compressed)
|
| 1158 |
return -ENOTSUP;
|
| 1159 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
| 1160 |
} |
| 1161 |
|
| 1162 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
| 1163 |
{
|
| 1164 |
BlockDriver *drv = bs->drv; |
| 1165 |
if (!drv)
|
| 1166 |
return -ENOMEDIUM;
|
| 1167 |
if (!drv->bdrv_get_info)
|
| 1168 |
return -ENOTSUP;
|
| 1169 |
memset(bdi, 0, sizeof(*bdi)); |
| 1170 |
return drv->bdrv_get_info(bs, bdi);
|
| 1171 |
} |
| 1172 |
|
| 1173 |
/**************************************************************/
|
| 1174 |
/* handling of snapshots */
|
| 1175 |
|
| 1176 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
| 1177 |
QEMUSnapshotInfo *sn_info) |
| 1178 |
{
|
| 1179 |
BlockDriver *drv = bs->drv; |
| 1180 |
if (!drv)
|
| 1181 |
return -ENOMEDIUM;
|
| 1182 |
if (!drv->bdrv_snapshot_create)
|
| 1183 |
return -ENOTSUP;
|
| 1184 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
| 1185 |
} |
| 1186 |
|
| 1187 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
| 1188 |
const char *snapshot_id) |
| 1189 |
{
|
| 1190 |
BlockDriver *drv = bs->drv; |
| 1191 |
if (!drv)
|
| 1192 |
return -ENOMEDIUM;
|
| 1193 |
if (!drv->bdrv_snapshot_goto)
|
| 1194 |
return -ENOTSUP;
|
| 1195 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
| 1196 |
} |
| 1197 |
|
| 1198 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
| 1199 |
{
|
| 1200 |
BlockDriver *drv = bs->drv; |
| 1201 |
if (!drv)
|
| 1202 |
return -ENOMEDIUM;
|
| 1203 |
if (!drv->bdrv_snapshot_delete)
|
| 1204 |
return -ENOTSUP;
|
| 1205 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
| 1206 |
} |
| 1207 |
|
| 1208 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
| 1209 |
QEMUSnapshotInfo **psn_info) |
| 1210 |
{
|
| 1211 |
BlockDriver *drv = bs->drv; |
| 1212 |
if (!drv)
|
| 1213 |
return -ENOMEDIUM;
|
| 1214 |
if (!drv->bdrv_snapshot_list)
|
| 1215 |
return -ENOTSUP;
|
| 1216 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
| 1217 |
} |
| 1218 |
|
| 1219 |
#define NB_SUFFIXES 4 |
| 1220 |
|
| 1221 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
| 1222 |
{
|
| 1223 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
| 1224 |
int64_t base; |
| 1225 |
int i;
|
| 1226 |
|
| 1227 |
if (size <= 999) { |
| 1228 |
snprintf(buf, buf_size, "%" PRId64, size);
|
| 1229 |
} else {
|
| 1230 |
base = 1024;
|
| 1231 |
for(i = 0; i < NB_SUFFIXES; i++) { |
| 1232 |
if (size < (10 * base)) { |
| 1233 |
snprintf(buf, buf_size, "%0.1f%c",
|
| 1234 |
(double)size / base,
|
| 1235 |
suffixes[i]); |
| 1236 |
break;
|
| 1237 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
| 1238 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
| 1239 |
((size + (base >> 1)) / base),
|
| 1240 |
suffixes[i]); |
| 1241 |
break;
|
| 1242 |
} |
| 1243 |
base = base * 1024;
|
| 1244 |
} |
| 1245 |
} |
| 1246 |
return buf;
|
| 1247 |
} |
| 1248 |
|
| 1249 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
| 1250 |
{
|
| 1251 |
char buf1[128], date_buf[128], clock_buf[128]; |
| 1252 |
#ifdef _WIN32
|
| 1253 |
struct tm *ptm;
|
| 1254 |
#else
|
| 1255 |
struct tm tm;
|
| 1256 |
#endif
|
| 1257 |
time_t ti; |
| 1258 |
int64_t secs; |
| 1259 |
|
| 1260 |
if (!sn) {
|
| 1261 |
snprintf(buf, buf_size, |
| 1262 |
"%-10s%-20s%7s%20s%15s",
|
| 1263 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
| 1264 |
} else {
|
| 1265 |
ti = sn->date_sec; |
| 1266 |
#ifdef _WIN32
|
| 1267 |
ptm = localtime(&ti); |
| 1268 |
strftime(date_buf, sizeof(date_buf),
|
| 1269 |
"%Y-%m-%d %H:%M:%S", ptm);
|
| 1270 |
#else
|
| 1271 |
localtime_r(&ti, &tm); |
| 1272 |
strftime(date_buf, sizeof(date_buf),
|
| 1273 |
"%Y-%m-%d %H:%M:%S", &tm);
|
| 1274 |
#endif
|
| 1275 |
secs = sn->vm_clock_nsec / 1000000000;
|
| 1276 |
snprintf(clock_buf, sizeof(clock_buf),
|
| 1277 |
"%02d:%02d:%02d.%03d",
|
| 1278 |
(int)(secs / 3600), |
| 1279 |
(int)((secs / 60) % 60), |
| 1280 |
(int)(secs % 60), |
| 1281 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
| 1282 |
snprintf(buf, buf_size, |
| 1283 |
"%-10s%-20s%7s%20s%15s",
|
| 1284 |
sn->id_str, sn->name, |
| 1285 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
| 1286 |
date_buf, |
| 1287 |
clock_buf); |
| 1288 |
} |
| 1289 |
return buf;
|
| 1290 |
} |
| 1291 |
|
| 1292 |
|
| 1293 |
/**************************************************************/
|
| 1294 |
/* async I/Os */
|
| 1295 |
|
| 1296 |
typedef struct VectorTranslationState { |
| 1297 |
QEMUIOVector *iov; |
| 1298 |
uint8_t *bounce; |
| 1299 |
int is_write;
|
| 1300 |
BlockDriverAIOCB *aiocb; |
| 1301 |
BlockDriverAIOCB *this_aiocb; |
| 1302 |
} VectorTranslationState; |
| 1303 |
|
| 1304 |
static void bdrv_aio_rw_vector_cb(void *opaque, int ret) |
| 1305 |
{
|
| 1306 |
VectorTranslationState *s = opaque; |
| 1307 |
|
| 1308 |
if (!s->is_write) {
|
| 1309 |
qemu_iovec_from_buffer(s->iov, s->bounce, s->iov->size); |
| 1310 |
} |
| 1311 |
qemu_vfree(s->bounce); |
| 1312 |
s->this_aiocb->cb(s->this_aiocb->opaque, ret); |
| 1313 |
qemu_aio_release(s->this_aiocb); |
| 1314 |
} |
| 1315 |
|
| 1316 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
| 1317 |
int64_t sector_num, |
| 1318 |
QEMUIOVector *iov, |
| 1319 |
int nb_sectors,
|
| 1320 |
BlockDriverCompletionFunc *cb, |
| 1321 |
void *opaque,
|
| 1322 |
int is_write)
|
| 1323 |
|
| 1324 |
{
|
| 1325 |
VectorTranslationState *s = qemu_mallocz(sizeof(*s));
|
| 1326 |
BlockDriverAIOCB *aiocb = qemu_aio_get(bs, cb, opaque); |
| 1327 |
|
| 1328 |
s->this_aiocb = aiocb; |
| 1329 |
s->iov = iov; |
| 1330 |
s->bounce = qemu_memalign(512, nb_sectors * 512); |
| 1331 |
s->is_write = is_write; |
| 1332 |
if (is_write) {
|
| 1333 |
qemu_iovec_to_buffer(s->iov, s->bounce); |
| 1334 |
s->aiocb = bdrv_aio_write(bs, sector_num, s->bounce, nb_sectors, |
| 1335 |
bdrv_aio_rw_vector_cb, s); |
| 1336 |
} else {
|
| 1337 |
s->aiocb = bdrv_aio_read(bs, sector_num, s->bounce, nb_sectors, |
| 1338 |
bdrv_aio_rw_vector_cb, s); |
| 1339 |
} |
| 1340 |
return aiocb;
|
| 1341 |
} |
| 1342 |
|
| 1343 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
| 1344 |
QEMUIOVector *iov, int nb_sectors,
|
| 1345 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1346 |
{
|
| 1347 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1348 |
return NULL; |
| 1349 |
|
| 1350 |
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
|
| 1351 |
cb, opaque, 0);
|
| 1352 |
} |
| 1353 |
|
| 1354 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
| 1355 |
QEMUIOVector *iov, int nb_sectors,
|
| 1356 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1357 |
{
|
| 1358 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1359 |
return NULL; |
| 1360 |
|
| 1361 |
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
|
| 1362 |
cb, opaque, 1);
|
| 1363 |
} |
| 1364 |
|
| 1365 |
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
| 1366 |
uint8_t *buf, int nb_sectors,
|
| 1367 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1368 |
{
|
| 1369 |
BlockDriver *drv = bs->drv; |
| 1370 |
BlockDriverAIOCB *ret; |
| 1371 |
|
| 1372 |
if (!drv)
|
| 1373 |
return NULL; |
| 1374 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1375 |
return NULL; |
| 1376 |
|
| 1377 |
ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
| 1378 |
|
| 1379 |
if (ret) {
|
| 1380 |
/* Update stats even though technically transfer has not happened. */
|
| 1381 |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
| 1382 |
bs->rd_ops ++; |
| 1383 |
} |
| 1384 |
|
| 1385 |
return ret;
|
| 1386 |
} |
| 1387 |
|
| 1388 |
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
| 1389 |
const uint8_t *buf, int nb_sectors, |
| 1390 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1391 |
{
|
| 1392 |
BlockDriver *drv = bs->drv; |
| 1393 |
BlockDriverAIOCB *ret; |
| 1394 |
|
| 1395 |
if (!drv)
|
| 1396 |
return NULL; |
| 1397 |
if (bs->read_only)
|
| 1398 |
return NULL; |
| 1399 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1400 |
return NULL; |
| 1401 |
|
| 1402 |
ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
| 1403 |
|
| 1404 |
if (ret) {
|
| 1405 |
/* Update stats even though technically transfer has not happened. */
|
| 1406 |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
| 1407 |
bs->wr_ops ++; |
| 1408 |
} |
| 1409 |
|
| 1410 |
return ret;
|
| 1411 |
} |
| 1412 |
|
| 1413 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
| 1414 |
{
|
| 1415 |
BlockDriver *drv = acb->bs->drv; |
| 1416 |
|
| 1417 |
if (acb->cb == bdrv_aio_rw_vector_cb) {
|
| 1418 |
VectorTranslationState *s = acb->opaque; |
| 1419 |
acb = s->aiocb; |
| 1420 |
} |
| 1421 |
|
| 1422 |
drv->bdrv_aio_cancel(acb); |
| 1423 |
} |
| 1424 |
|
| 1425 |
|
| 1426 |
/**************************************************************/
|
| 1427 |
/* async block device emulation */
|
| 1428 |
|
| 1429 |
static void bdrv_aio_bh_cb(void *opaque) |
| 1430 |
{
|
| 1431 |
BlockDriverAIOCBSync *acb = opaque; |
| 1432 |
acb->common.cb(acb->common.opaque, acb->ret); |
| 1433 |
qemu_aio_release(acb); |
| 1434 |
} |
| 1435 |
|
| 1436 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
| 1437 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
| 1438 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1439 |
{
|
| 1440 |
BlockDriverAIOCBSync *acb; |
| 1441 |
int ret;
|
| 1442 |
|
| 1443 |
acb = qemu_aio_get(bs, cb, opaque); |
| 1444 |
if (!acb->bh)
|
| 1445 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 1446 |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
| 1447 |
acb->ret = ret; |
| 1448 |
qemu_bh_schedule(acb->bh); |
| 1449 |
return &acb->common;
|
| 1450 |
} |
| 1451 |
|
| 1452 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
| 1453 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
| 1454 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1455 |
{
|
| 1456 |
BlockDriverAIOCBSync *acb; |
| 1457 |
int ret;
|
| 1458 |
|
| 1459 |
acb = qemu_aio_get(bs, cb, opaque); |
| 1460 |
if (!acb->bh)
|
| 1461 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 1462 |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
| 1463 |
acb->ret = ret; |
| 1464 |
qemu_bh_schedule(acb->bh); |
| 1465 |
return &acb->common;
|
| 1466 |
} |
| 1467 |
|
| 1468 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
| 1469 |
{
|
| 1470 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
| 1471 |
qemu_bh_cancel(acb->bh); |
| 1472 |
qemu_aio_release(acb); |
| 1473 |
} |
| 1474 |
|
| 1475 |
/**************************************************************/
|
| 1476 |
/* sync block device emulation */
|
| 1477 |
|
| 1478 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
| 1479 |
{
|
| 1480 |
*(int *)opaque = ret;
|
| 1481 |
} |
| 1482 |
|
| 1483 |
#define NOT_DONE 0x7fffffff |
| 1484 |
|
| 1485 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 1486 |
uint8_t *buf, int nb_sectors)
|
| 1487 |
{
|
| 1488 |
int async_ret;
|
| 1489 |
BlockDriverAIOCB *acb; |
| 1490 |
|
| 1491 |
async_ret = NOT_DONE; |
| 1492 |
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
| 1493 |
bdrv_rw_em_cb, &async_ret); |
| 1494 |
if (acb == NULL) |
| 1495 |
return -1; |
| 1496 |
|
| 1497 |
while (async_ret == NOT_DONE) {
|
| 1498 |
qemu_aio_wait(); |
| 1499 |
} |
| 1500 |
|
| 1501 |
return async_ret;
|
| 1502 |
} |
| 1503 |
|
| 1504 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 1505 |
const uint8_t *buf, int nb_sectors) |
| 1506 |
{
|
| 1507 |
int async_ret;
|
| 1508 |
BlockDriverAIOCB *acb; |
| 1509 |
|
| 1510 |
async_ret = NOT_DONE; |
| 1511 |
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
| 1512 |
bdrv_rw_em_cb, &async_ret); |
| 1513 |
if (acb == NULL) |
| 1514 |
return -1; |
| 1515 |
while (async_ret == NOT_DONE) {
|
| 1516 |
qemu_aio_wait(); |
| 1517 |
} |
| 1518 |
return async_ret;
|
| 1519 |
} |
| 1520 |
|
| 1521 |
void bdrv_init(void) |
| 1522 |
{
|
| 1523 |
bdrv_register(&bdrv_raw); |
| 1524 |
bdrv_register(&bdrv_host_device); |
| 1525 |
#ifndef _WIN32
|
| 1526 |
bdrv_register(&bdrv_cow); |
| 1527 |
#endif
|
| 1528 |
bdrv_register(&bdrv_qcow); |
| 1529 |
bdrv_register(&bdrv_vmdk); |
| 1530 |
bdrv_register(&bdrv_cloop); |
| 1531 |
bdrv_register(&bdrv_dmg); |
| 1532 |
bdrv_register(&bdrv_bochs); |
| 1533 |
bdrv_register(&bdrv_vpc); |
| 1534 |
bdrv_register(&bdrv_vvfat); |
| 1535 |
bdrv_register(&bdrv_qcow2); |
| 1536 |
bdrv_register(&bdrv_parallels); |
| 1537 |
bdrv_register(&bdrv_nbd); |
| 1538 |
} |
| 1539 |
|
| 1540 |
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
|
| 1541 |
void *opaque)
|
| 1542 |
{
|
| 1543 |
BlockDriver *drv; |
| 1544 |
BlockDriverAIOCB *acb; |
| 1545 |
|
| 1546 |
drv = bs->drv; |
| 1547 |
if (drv->free_aiocb) {
|
| 1548 |
acb = drv->free_aiocb; |
| 1549 |
drv->free_aiocb = acb->next; |
| 1550 |
} else {
|
| 1551 |
acb = qemu_mallocz(drv->aiocb_size); |
| 1552 |
} |
| 1553 |
acb->bs = bs; |
| 1554 |
acb->cb = cb; |
| 1555 |
acb->opaque = opaque; |
| 1556 |
return acb;
|
| 1557 |
} |
| 1558 |
|
| 1559 |
void qemu_aio_release(void *p) |
| 1560 |
{
|
| 1561 |
BlockDriverAIOCB *acb = p; |
| 1562 |
BlockDriver *drv = acb->bs->drv; |
| 1563 |
acb->next = drv->free_aiocb; |
| 1564 |
drv->free_aiocb = acb; |
| 1565 |
} |
| 1566 |
|
| 1567 |
/**************************************************************/
|
| 1568 |
/* removable device support */
|
| 1569 |
|
| 1570 |
/**
|
| 1571 |
* Return TRUE if the media is present
|
| 1572 |
*/
|
| 1573 |
int bdrv_is_inserted(BlockDriverState *bs)
|
| 1574 |
{
|
| 1575 |
BlockDriver *drv = bs->drv; |
| 1576 |
int ret;
|
| 1577 |
if (!drv)
|
| 1578 |
return 0; |
| 1579 |
if (!drv->bdrv_is_inserted)
|
| 1580 |
return 1; |
| 1581 |
ret = drv->bdrv_is_inserted(bs); |
| 1582 |
return ret;
|
| 1583 |
} |
| 1584 |
|
| 1585 |
/**
|
| 1586 |
* Return TRUE if the media changed since the last call to this
|
| 1587 |
* function. It is currently only used for floppy disks
|
| 1588 |
*/
|
| 1589 |
int bdrv_media_changed(BlockDriverState *bs)
|
| 1590 |
{
|
| 1591 |
BlockDriver *drv = bs->drv; |
| 1592 |
int ret;
|
| 1593 |
|
| 1594 |
if (!drv || !drv->bdrv_media_changed)
|
| 1595 |
ret = -ENOTSUP; |
| 1596 |
else
|
| 1597 |
ret = drv->bdrv_media_changed(bs); |
| 1598 |
if (ret == -ENOTSUP)
|
| 1599 |
ret = bs->media_changed; |
| 1600 |
bs->media_changed = 0;
|
| 1601 |
return ret;
|
| 1602 |
} |
| 1603 |
|
| 1604 |
/**
|
| 1605 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
| 1606 |
*/
|
| 1607 |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
| 1608 |
{
|
| 1609 |
BlockDriver *drv = bs->drv; |
| 1610 |
int ret;
|
| 1611 |
|
| 1612 |
if (!drv || !drv->bdrv_eject) {
|
| 1613 |
ret = -ENOTSUP; |
| 1614 |
} else {
|
| 1615 |
ret = drv->bdrv_eject(bs, eject_flag); |
| 1616 |
} |
| 1617 |
if (ret == -ENOTSUP) {
|
| 1618 |
if (eject_flag)
|
| 1619 |
bdrv_close(bs); |
| 1620 |
} |
| 1621 |
} |
| 1622 |
|
| 1623 |
int bdrv_is_locked(BlockDriverState *bs)
|
| 1624 |
{
|
| 1625 |
return bs->locked;
|
| 1626 |
} |
| 1627 |
|
| 1628 |
/**
|
| 1629 |
* Lock or unlock the media (if it is locked, the user won't be able
|
| 1630 |
* to eject it manually).
|
| 1631 |
*/
|
| 1632 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
| 1633 |
{
|
| 1634 |
BlockDriver *drv = bs->drv; |
| 1635 |
|
| 1636 |
bs->locked = locked; |
| 1637 |
if (drv && drv->bdrv_set_locked) {
|
| 1638 |
drv->bdrv_set_locked(bs, locked); |
| 1639 |
} |
| 1640 |
} |
| 1641 |
|
| 1642 |
/* needed for generic scsi interface */
|
| 1643 |
|
| 1644 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 1645 |
{
|
| 1646 |
BlockDriver *drv = bs->drv; |
| 1647 |
|
| 1648 |
if (drv && drv->bdrv_ioctl)
|
| 1649 |
return drv->bdrv_ioctl(bs, req, buf);
|
| 1650 |
return -ENOTSUP;
|
| 1651 |
} |