root / block.c @ 336c1c12
History | View | Annotate | Download (70.1 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 |
#include "qemu-common.h" |
| 26 |
#include "monitor.h" |
| 27 |
#include "block_int.h" |
| 28 |
#include "module.h" |
| 29 |
#include "qemu-objects.h" |
| 30 |
|
| 31 |
#ifdef CONFIG_BSD
|
| 32 |
#include <sys/types.h> |
| 33 |
#include <sys/stat.h> |
| 34 |
#include <sys/ioctl.h> |
| 35 |
#include <sys/queue.h> |
| 36 |
#ifndef __DragonFly__
|
| 37 |
#include <sys/disk.h> |
| 38 |
#endif
|
| 39 |
#endif
|
| 40 |
|
| 41 |
#ifdef _WIN32
|
| 42 |
#include <windows.h> |
| 43 |
#endif
|
| 44 |
|
| 45 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
| 46 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 47 |
BlockDriverCompletionFunc *cb, void *opaque);
|
| 48 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
| 49 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 50 |
BlockDriverCompletionFunc *cb, void *opaque);
|
| 51 |
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
| 52 |
BlockDriverCompletionFunc *cb, void *opaque);
|
| 53 |
static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
|
| 54 |
BlockDriverCompletionFunc *cb, void *opaque);
|
| 55 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 56 |
uint8_t *buf, int nb_sectors);
|
| 57 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 58 |
const uint8_t *buf, int nb_sectors); |
| 59 |
|
| 60 |
static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
|
| 61 |
QTAILQ_HEAD_INITIALIZER(bdrv_states); |
| 62 |
|
| 63 |
static QLIST_HEAD(, BlockDriver) bdrv_drivers =
|
| 64 |
QLIST_HEAD_INITIALIZER(bdrv_drivers); |
| 65 |
|
| 66 |
/* The device to use for VM snapshots */
|
| 67 |
static BlockDriverState *bs_snapshots;
|
| 68 |
|
| 69 |
/* If non-zero, use only whitelisted block drivers */
|
| 70 |
static int use_bdrv_whitelist; |
| 71 |
|
| 72 |
int path_is_absolute(const char *path) |
| 73 |
{
|
| 74 |
const char *p; |
| 75 |
#ifdef _WIN32
|
| 76 |
/* specific case for names like: "\\.\d:" */
|
| 77 |
if (*path == '/' || *path == '\\') |
| 78 |
return 1; |
| 79 |
#endif
|
| 80 |
p = strchr(path, ':');
|
| 81 |
if (p)
|
| 82 |
p++; |
| 83 |
else
|
| 84 |
p = path; |
| 85 |
#ifdef _WIN32
|
| 86 |
return (*p == '/' || *p == '\\'); |
| 87 |
#else
|
| 88 |
return (*p == '/'); |
| 89 |
#endif
|
| 90 |
} |
| 91 |
|
| 92 |
/* if filename is absolute, just copy it to dest. Otherwise, build a
|
| 93 |
path to it by considering it is relative to base_path. URL are
|
| 94 |
supported. */
|
| 95 |
void path_combine(char *dest, int dest_size, |
| 96 |
const char *base_path, |
| 97 |
const char *filename) |
| 98 |
{
|
| 99 |
const char *p, *p1; |
| 100 |
int len;
|
| 101 |
|
| 102 |
if (dest_size <= 0) |
| 103 |
return;
|
| 104 |
if (path_is_absolute(filename)) {
|
| 105 |
pstrcpy(dest, dest_size, filename); |
| 106 |
} else {
|
| 107 |
p = strchr(base_path, ':');
|
| 108 |
if (p)
|
| 109 |
p++; |
| 110 |
else
|
| 111 |
p = base_path; |
| 112 |
p1 = strrchr(base_path, '/');
|
| 113 |
#ifdef _WIN32
|
| 114 |
{
|
| 115 |
const char *p2; |
| 116 |
p2 = strrchr(base_path, '\\');
|
| 117 |
if (!p1 || p2 > p1)
|
| 118 |
p1 = p2; |
| 119 |
} |
| 120 |
#endif
|
| 121 |
if (p1)
|
| 122 |
p1++; |
| 123 |
else
|
| 124 |
p1 = base_path; |
| 125 |
if (p1 > p)
|
| 126 |
p = p1; |
| 127 |
len = p - base_path; |
| 128 |
if (len > dest_size - 1) |
| 129 |
len = dest_size - 1;
|
| 130 |
memcpy(dest, base_path, len); |
| 131 |
dest[len] = '\0';
|
| 132 |
pstrcat(dest, dest_size, filename); |
| 133 |
} |
| 134 |
} |
| 135 |
|
| 136 |
void bdrv_register(BlockDriver *bdrv)
|
| 137 |
{
|
| 138 |
if (!bdrv->bdrv_aio_readv) {
|
| 139 |
/* add AIO emulation layer */
|
| 140 |
bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
| 141 |
bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
| 142 |
} else if (!bdrv->bdrv_read) { |
| 143 |
/* add synchronous IO emulation layer */
|
| 144 |
bdrv->bdrv_read = bdrv_read_em; |
| 145 |
bdrv->bdrv_write = bdrv_write_em; |
| 146 |
} |
| 147 |
|
| 148 |
if (!bdrv->bdrv_aio_flush)
|
| 149 |
bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
| 150 |
|
| 151 |
QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
| 152 |
} |
| 153 |
|
| 154 |
/* create a new block device (by default it is empty) */
|
| 155 |
BlockDriverState *bdrv_new(const char *device_name) |
| 156 |
{
|
| 157 |
BlockDriverState *bs; |
| 158 |
|
| 159 |
bs = qemu_mallocz(sizeof(BlockDriverState));
|
| 160 |
pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
|
| 161 |
if (device_name[0] != '\0') { |
| 162 |
QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
| 163 |
} |
| 164 |
return bs;
|
| 165 |
} |
| 166 |
|
| 167 |
BlockDriver *bdrv_find_format(const char *format_name) |
| 168 |
{
|
| 169 |
BlockDriver *drv1; |
| 170 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
|
| 171 |
if (!strcmp(drv1->format_name, format_name)) {
|
| 172 |
return drv1;
|
| 173 |
} |
| 174 |
} |
| 175 |
return NULL; |
| 176 |
} |
| 177 |
|
| 178 |
static int bdrv_is_whitelisted(BlockDriver *drv) |
| 179 |
{
|
| 180 |
static const char *whitelist[] = { |
| 181 |
CONFIG_BDRV_WHITELIST |
| 182 |
}; |
| 183 |
const char **p; |
| 184 |
|
| 185 |
if (!whitelist[0]) |
| 186 |
return 1; /* no whitelist, anything goes */ |
| 187 |
|
| 188 |
for (p = whitelist; *p; p++) {
|
| 189 |
if (!strcmp(drv->format_name, *p)) {
|
| 190 |
return 1; |
| 191 |
} |
| 192 |
} |
| 193 |
return 0; |
| 194 |
} |
| 195 |
|
| 196 |
BlockDriver *bdrv_find_whitelisted_format(const char *format_name) |
| 197 |
{
|
| 198 |
BlockDriver *drv = bdrv_find_format(format_name); |
| 199 |
return drv && bdrv_is_whitelisted(drv) ? drv : NULL; |
| 200 |
} |
| 201 |
|
| 202 |
int bdrv_create(BlockDriver *drv, const char* filename, |
| 203 |
QEMUOptionParameter *options) |
| 204 |
{
|
| 205 |
if (!drv->bdrv_create)
|
| 206 |
return -ENOTSUP;
|
| 207 |
|
| 208 |
return drv->bdrv_create(filename, options);
|
| 209 |
} |
| 210 |
|
| 211 |
int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
| 212 |
{
|
| 213 |
BlockDriver *drv; |
| 214 |
|
| 215 |
drv = bdrv_find_protocol(filename); |
| 216 |
if (drv == NULL) { |
| 217 |
drv = bdrv_find_format("file");
|
| 218 |
} |
| 219 |
|
| 220 |
return bdrv_create(drv, filename, options);
|
| 221 |
} |
| 222 |
|
| 223 |
#ifdef _WIN32
|
| 224 |
void get_tmp_filename(char *filename, int size) |
| 225 |
{
|
| 226 |
char temp_dir[MAX_PATH];
|
| 227 |
|
| 228 |
GetTempPath(MAX_PATH, temp_dir); |
| 229 |
GetTempFileName(temp_dir, "qem", 0, filename); |
| 230 |
} |
| 231 |
#else
|
| 232 |
void get_tmp_filename(char *filename, int size) |
| 233 |
{
|
| 234 |
int fd;
|
| 235 |
const char *tmpdir; |
| 236 |
/* XXX: race condition possible */
|
| 237 |
tmpdir = getenv("TMPDIR");
|
| 238 |
if (!tmpdir)
|
| 239 |
tmpdir = "/tmp";
|
| 240 |
snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
|
| 241 |
fd = mkstemp(filename); |
| 242 |
close(fd); |
| 243 |
} |
| 244 |
#endif
|
| 245 |
|
| 246 |
#ifdef _WIN32
|
| 247 |
static int is_windows_drive_prefix(const char *filename) |
| 248 |
{
|
| 249 |
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 250 |
(filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 251 |
filename[1] == ':'); |
| 252 |
} |
| 253 |
|
| 254 |
int is_windows_drive(const char *filename) |
| 255 |
{
|
| 256 |
if (is_windows_drive_prefix(filename) &&
|
| 257 |
filename[2] == '\0') |
| 258 |
return 1; |
| 259 |
if (strstart(filename, "\\\\.\\", NULL) || |
| 260 |
strstart(filename, "//./", NULL)) |
| 261 |
return 1; |
| 262 |
return 0; |
| 263 |
} |
| 264 |
#endif
|
| 265 |
|
| 266 |
/*
|
| 267 |
* Detect host devices. By convention, /dev/cdrom[N] is always
|
| 268 |
* recognized as a host CDROM.
|
| 269 |
*/
|
| 270 |
static BlockDriver *find_hdev_driver(const char *filename) |
| 271 |
{
|
| 272 |
int score_max = 0, score; |
| 273 |
BlockDriver *drv = NULL, *d;
|
| 274 |
|
| 275 |
QLIST_FOREACH(d, &bdrv_drivers, list) {
|
| 276 |
if (d->bdrv_probe_device) {
|
| 277 |
score = d->bdrv_probe_device(filename); |
| 278 |
if (score > score_max) {
|
| 279 |
score_max = score; |
| 280 |
drv = d; |
| 281 |
} |
| 282 |
} |
| 283 |
} |
| 284 |
|
| 285 |
return drv;
|
| 286 |
} |
| 287 |
|
| 288 |
BlockDriver *bdrv_find_protocol(const char *filename) |
| 289 |
{
|
| 290 |
BlockDriver *drv1; |
| 291 |
char protocol[128]; |
| 292 |
int len;
|
| 293 |
const char *p; |
| 294 |
|
| 295 |
/* TODO Drivers without bdrv_file_open must be specified explicitly */
|
| 296 |
|
| 297 |
/*
|
| 298 |
* XXX(hch): we really should not let host device detection
|
| 299 |
* override an explicit protocol specification, but moving this
|
| 300 |
* later breaks access to device names with colons in them.
|
| 301 |
* Thanks to the brain-dead persistent naming schemes on udev-
|
| 302 |
* based Linux systems those actually are quite common.
|
| 303 |
*/
|
| 304 |
drv1 = find_hdev_driver(filename); |
| 305 |
if (drv1) {
|
| 306 |
return drv1;
|
| 307 |
} |
| 308 |
|
| 309 |
#ifdef _WIN32
|
| 310 |
if (is_windows_drive(filename) ||
|
| 311 |
is_windows_drive_prefix(filename)) |
| 312 |
return bdrv_find_format("file"); |
| 313 |
#endif
|
| 314 |
|
| 315 |
p = strchr(filename, ':');
|
| 316 |
if (!p) {
|
| 317 |
return bdrv_find_format("file"); |
| 318 |
} |
| 319 |
len = p - filename; |
| 320 |
if (len > sizeof(protocol) - 1) |
| 321 |
len = sizeof(protocol) - 1; |
| 322 |
memcpy(protocol, filename, len); |
| 323 |
protocol[len] = '\0';
|
| 324 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
|
| 325 |
if (drv1->protocol_name &&
|
| 326 |
!strcmp(drv1->protocol_name, protocol)) {
|
| 327 |
return drv1;
|
| 328 |
} |
| 329 |
} |
| 330 |
return NULL; |
| 331 |
} |
| 332 |
|
| 333 |
static int find_image_format(const char *filename, BlockDriver **pdrv) |
| 334 |
{
|
| 335 |
int ret, score, score_max;
|
| 336 |
BlockDriver *drv1, *drv; |
| 337 |
uint8_t buf[2048];
|
| 338 |
BlockDriverState *bs; |
| 339 |
|
| 340 |
ret = bdrv_file_open(&bs, filename, 0);
|
| 341 |
if (ret < 0) { |
| 342 |
*pdrv = NULL;
|
| 343 |
return ret;
|
| 344 |
} |
| 345 |
|
| 346 |
/* Return the raw BlockDriver * to scsi-generic devices or empty drives */
|
| 347 |
if (bs->sg || !bdrv_is_inserted(bs)) {
|
| 348 |
bdrv_delete(bs); |
| 349 |
drv = bdrv_find_format("raw");
|
| 350 |
if (!drv) {
|
| 351 |
ret = -ENOENT; |
| 352 |
} |
| 353 |
*pdrv = drv; |
| 354 |
return ret;
|
| 355 |
} |
| 356 |
|
| 357 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
| 358 |
bdrv_delete(bs); |
| 359 |
if (ret < 0) { |
| 360 |
*pdrv = NULL;
|
| 361 |
return ret;
|
| 362 |
} |
| 363 |
|
| 364 |
score_max = 0;
|
| 365 |
drv = NULL;
|
| 366 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
|
| 367 |
if (drv1->bdrv_probe) {
|
| 368 |
score = drv1->bdrv_probe(buf, ret, filename); |
| 369 |
if (score > score_max) {
|
| 370 |
score_max = score; |
| 371 |
drv = drv1; |
| 372 |
} |
| 373 |
} |
| 374 |
} |
| 375 |
if (!drv) {
|
| 376 |
ret = -ENOENT; |
| 377 |
} |
| 378 |
*pdrv = drv; |
| 379 |
return ret;
|
| 380 |
} |
| 381 |
|
| 382 |
/**
|
| 383 |
* Set the current 'total_sectors' value
|
| 384 |
*/
|
| 385 |
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
| 386 |
{
|
| 387 |
BlockDriver *drv = bs->drv; |
| 388 |
|
| 389 |
/* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
|
| 390 |
if (bs->sg)
|
| 391 |
return 0; |
| 392 |
|
| 393 |
/* query actual device if possible, otherwise just trust the hint */
|
| 394 |
if (drv->bdrv_getlength) {
|
| 395 |
int64_t length = drv->bdrv_getlength(bs); |
| 396 |
if (length < 0) { |
| 397 |
return length;
|
| 398 |
} |
| 399 |
hint = length >> BDRV_SECTOR_BITS; |
| 400 |
} |
| 401 |
|
| 402 |
bs->total_sectors = hint; |
| 403 |
return 0; |
| 404 |
} |
| 405 |
|
| 406 |
/*
|
| 407 |
* Common part for opening disk images and files
|
| 408 |
*/
|
| 409 |
static int bdrv_open_common(BlockDriverState *bs, const char *filename, |
| 410 |
int flags, BlockDriver *drv)
|
| 411 |
{
|
| 412 |
int ret, open_flags;
|
| 413 |
|
| 414 |
assert(drv != NULL);
|
| 415 |
|
| 416 |
bs->file = NULL;
|
| 417 |
bs->total_sectors = 0;
|
| 418 |
bs->encrypted = 0;
|
| 419 |
bs->valid_key = 0;
|
| 420 |
bs->open_flags = flags; |
| 421 |
/* buffer_alignment defaulted to 512, drivers can change this value */
|
| 422 |
bs->buffer_alignment = 512;
|
| 423 |
|
| 424 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
| 425 |
|
| 426 |
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
|
| 427 |
return -ENOTSUP;
|
| 428 |
} |
| 429 |
|
| 430 |
bs->drv = drv; |
| 431 |
bs->opaque = qemu_mallocz(drv->instance_size); |
| 432 |
|
| 433 |
/*
|
| 434 |
* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
|
| 435 |
* write cache to the guest. We do need the fdatasync to flush
|
| 436 |
* out transactions for block allocations, and we maybe have a
|
| 437 |
* volatile write cache in our backing device to deal with.
|
| 438 |
*/
|
| 439 |
if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
|
| 440 |
bs->enable_write_cache = 1;
|
| 441 |
|
| 442 |
/*
|
| 443 |
* Clear flags that are internal to the block layer before opening the
|
| 444 |
* image.
|
| 445 |
*/
|
| 446 |
open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
| 447 |
|
| 448 |
/*
|
| 449 |
* Snapshots should be writeable.
|
| 450 |
*/
|
| 451 |
if (bs->is_temporary) {
|
| 452 |
open_flags |= BDRV_O_RDWR; |
| 453 |
} |
| 454 |
|
| 455 |
/* Open the image, either directly or using a protocol */
|
| 456 |
if (drv->bdrv_file_open) {
|
| 457 |
ret = drv->bdrv_file_open(bs, filename, open_flags); |
| 458 |
} else {
|
| 459 |
ret = bdrv_file_open(&bs->file, filename, open_flags); |
| 460 |
if (ret >= 0) { |
| 461 |
ret = drv->bdrv_open(bs, open_flags); |
| 462 |
} |
| 463 |
} |
| 464 |
|
| 465 |
if (ret < 0) { |
| 466 |
goto free_and_fail;
|
| 467 |
} |
| 468 |
|
| 469 |
bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
| 470 |
|
| 471 |
ret = refresh_total_sectors(bs, bs->total_sectors); |
| 472 |
if (ret < 0) { |
| 473 |
goto free_and_fail;
|
| 474 |
} |
| 475 |
|
| 476 |
#ifndef _WIN32
|
| 477 |
if (bs->is_temporary) {
|
| 478 |
unlink(filename); |
| 479 |
} |
| 480 |
#endif
|
| 481 |
return 0; |
| 482 |
|
| 483 |
free_and_fail:
|
| 484 |
if (bs->file) {
|
| 485 |
bdrv_delete(bs->file); |
| 486 |
bs->file = NULL;
|
| 487 |
} |
| 488 |
qemu_free(bs->opaque); |
| 489 |
bs->opaque = NULL;
|
| 490 |
bs->drv = NULL;
|
| 491 |
return ret;
|
| 492 |
} |
| 493 |
|
| 494 |
/*
|
| 495 |
* Opens a file using a protocol (file, host_device, nbd, ...)
|
| 496 |
*/
|
| 497 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
| 498 |
{
|
| 499 |
BlockDriverState *bs; |
| 500 |
BlockDriver *drv; |
| 501 |
int ret;
|
| 502 |
|
| 503 |
drv = bdrv_find_protocol(filename); |
| 504 |
if (!drv) {
|
| 505 |
return -ENOENT;
|
| 506 |
} |
| 507 |
|
| 508 |
bs = bdrv_new("");
|
| 509 |
ret = bdrv_open_common(bs, filename, flags, drv); |
| 510 |
if (ret < 0) { |
| 511 |
bdrv_delete(bs); |
| 512 |
return ret;
|
| 513 |
} |
| 514 |
bs->growable = 1;
|
| 515 |
*pbs = bs; |
| 516 |
return 0; |
| 517 |
} |
| 518 |
|
| 519 |
/*
|
| 520 |
* Opens a disk image (raw, qcow2, vmdk, ...)
|
| 521 |
*/
|
| 522 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
| 523 |
BlockDriver *drv) |
| 524 |
{
|
| 525 |
int ret;
|
| 526 |
int probed = 0; |
| 527 |
|
| 528 |
if (flags & BDRV_O_SNAPSHOT) {
|
| 529 |
BlockDriverState *bs1; |
| 530 |
int64_t total_size; |
| 531 |
int is_protocol = 0; |
| 532 |
BlockDriver *bdrv_qcow2; |
| 533 |
QEMUOptionParameter *options; |
| 534 |
char tmp_filename[PATH_MAX];
|
| 535 |
char backing_filename[PATH_MAX];
|
| 536 |
|
| 537 |
/* if snapshot, we create a temporary backing file and open it
|
| 538 |
instead of opening 'filename' directly */
|
| 539 |
|
| 540 |
/* if there is a backing file, use it */
|
| 541 |
bs1 = bdrv_new("");
|
| 542 |
ret = bdrv_open(bs1, filename, 0, drv);
|
| 543 |
if (ret < 0) { |
| 544 |
bdrv_delete(bs1); |
| 545 |
return ret;
|
| 546 |
} |
| 547 |
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
| 548 |
|
| 549 |
if (bs1->drv && bs1->drv->protocol_name)
|
| 550 |
is_protocol = 1;
|
| 551 |
|
| 552 |
bdrv_delete(bs1); |
| 553 |
|
| 554 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
| 555 |
|
| 556 |
/* Real path is meaningless for protocols */
|
| 557 |
if (is_protocol)
|
| 558 |
snprintf(backing_filename, sizeof(backing_filename),
|
| 559 |
"%s", filename);
|
| 560 |
else if (!realpath(filename, backing_filename)) |
| 561 |
return -errno;
|
| 562 |
|
| 563 |
bdrv_qcow2 = bdrv_find_format("qcow2");
|
| 564 |
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
| 565 |
|
| 566 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
| 567 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
| 568 |
if (drv) {
|
| 569 |
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
| 570 |
drv->format_name); |
| 571 |
} |
| 572 |
|
| 573 |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
| 574 |
free_option_parameters(options); |
| 575 |
if (ret < 0) { |
| 576 |
return ret;
|
| 577 |
} |
| 578 |
|
| 579 |
filename = tmp_filename; |
| 580 |
drv = bdrv_qcow2; |
| 581 |
bs->is_temporary = 1;
|
| 582 |
} |
| 583 |
|
| 584 |
/* Find the right image format driver */
|
| 585 |
if (!drv) {
|
| 586 |
ret = find_image_format(filename, &drv); |
| 587 |
probed = 1;
|
| 588 |
} |
| 589 |
|
| 590 |
if (!drv) {
|
| 591 |
goto unlink_and_fail;
|
| 592 |
} |
| 593 |
|
| 594 |
/* Open the image */
|
| 595 |
ret = bdrv_open_common(bs, filename, flags, drv); |
| 596 |
if (ret < 0) { |
| 597 |
goto unlink_and_fail;
|
| 598 |
} |
| 599 |
|
| 600 |
bs->probed = probed; |
| 601 |
|
| 602 |
/* If there is a backing file, use it */
|
| 603 |
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
| 604 |
char backing_filename[PATH_MAX];
|
| 605 |
int back_flags;
|
| 606 |
BlockDriver *back_drv = NULL;
|
| 607 |
|
| 608 |
bs->backing_hd = bdrv_new("");
|
| 609 |
path_combine(backing_filename, sizeof(backing_filename),
|
| 610 |
filename, bs->backing_file); |
| 611 |
if (bs->backing_format[0] != '\0') |
| 612 |
back_drv = bdrv_find_format(bs->backing_format); |
| 613 |
|
| 614 |
/* backing files always opened read-only */
|
| 615 |
back_flags = |
| 616 |
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
| 617 |
|
| 618 |
ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); |
| 619 |
if (ret < 0) { |
| 620 |
bdrv_close(bs); |
| 621 |
return ret;
|
| 622 |
} |
| 623 |
if (bs->is_temporary) {
|
| 624 |
bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); |
| 625 |
} else {
|
| 626 |
/* base image inherits from "parent" */
|
| 627 |
bs->backing_hd->keep_read_only = bs->keep_read_only; |
| 628 |
} |
| 629 |
} |
| 630 |
|
| 631 |
if (!bdrv_key_required(bs)) {
|
| 632 |
/* call the change callback */
|
| 633 |
bs->media_changed = 1;
|
| 634 |
if (bs->change_cb)
|
| 635 |
bs->change_cb(bs->change_opaque); |
| 636 |
} |
| 637 |
|
| 638 |
return 0; |
| 639 |
|
| 640 |
unlink_and_fail:
|
| 641 |
if (bs->is_temporary) {
|
| 642 |
unlink(filename); |
| 643 |
} |
| 644 |
return ret;
|
| 645 |
} |
| 646 |
|
| 647 |
void bdrv_close(BlockDriverState *bs)
|
| 648 |
{
|
| 649 |
if (bs->drv) {
|
| 650 |
if (bs == bs_snapshots) {
|
| 651 |
bs_snapshots = NULL;
|
| 652 |
} |
| 653 |
if (bs->backing_hd) {
|
| 654 |
bdrv_delete(bs->backing_hd); |
| 655 |
bs->backing_hd = NULL;
|
| 656 |
} |
| 657 |
bs->drv->bdrv_close(bs); |
| 658 |
qemu_free(bs->opaque); |
| 659 |
#ifdef _WIN32
|
| 660 |
if (bs->is_temporary) {
|
| 661 |
unlink(bs->filename); |
| 662 |
} |
| 663 |
#endif
|
| 664 |
bs->opaque = NULL;
|
| 665 |
bs->drv = NULL;
|
| 666 |
|
| 667 |
if (bs->file != NULL) { |
| 668 |
bdrv_close(bs->file); |
| 669 |
} |
| 670 |
|
| 671 |
/* call the change callback */
|
| 672 |
bs->media_changed = 1;
|
| 673 |
if (bs->change_cb)
|
| 674 |
bs->change_cb(bs->change_opaque); |
| 675 |
} |
| 676 |
} |
| 677 |
|
| 678 |
void bdrv_close_all(void) |
| 679 |
{
|
| 680 |
BlockDriverState *bs; |
| 681 |
|
| 682 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 683 |
bdrv_close(bs); |
| 684 |
} |
| 685 |
} |
| 686 |
|
| 687 |
void bdrv_delete(BlockDriverState *bs)
|
| 688 |
{
|
| 689 |
assert(!bs->peer); |
| 690 |
|
| 691 |
/* remove from list, if necessary */
|
| 692 |
if (bs->device_name[0] != '\0') { |
| 693 |
QTAILQ_REMOVE(&bdrv_states, bs, list); |
| 694 |
} |
| 695 |
|
| 696 |
bdrv_close(bs); |
| 697 |
if (bs->file != NULL) { |
| 698 |
bdrv_delete(bs->file); |
| 699 |
} |
| 700 |
|
| 701 |
assert(bs != bs_snapshots); |
| 702 |
qemu_free(bs); |
| 703 |
} |
| 704 |
|
| 705 |
int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
|
| 706 |
{
|
| 707 |
if (bs->peer) {
|
| 708 |
return -EBUSY;
|
| 709 |
} |
| 710 |
bs->peer = qdev; |
| 711 |
return 0; |
| 712 |
} |
| 713 |
|
| 714 |
void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
|
| 715 |
{
|
| 716 |
assert(bs->peer == qdev); |
| 717 |
bs->peer = NULL;
|
| 718 |
} |
| 719 |
|
| 720 |
DeviceState *bdrv_get_attached(BlockDriverState *bs) |
| 721 |
{
|
| 722 |
return bs->peer;
|
| 723 |
} |
| 724 |
|
| 725 |
/*
|
| 726 |
* Run consistency checks on an image
|
| 727 |
*
|
| 728 |
* Returns 0 if the check could be completed (it doesn't mean that the image is
|
| 729 |
* free of errors) or -errno when an internal error occured. The results of the
|
| 730 |
* check are stored in res.
|
| 731 |
*/
|
| 732 |
int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
|
| 733 |
{
|
| 734 |
if (bs->drv->bdrv_check == NULL) { |
| 735 |
return -ENOTSUP;
|
| 736 |
} |
| 737 |
|
| 738 |
memset(res, 0, sizeof(*res)); |
| 739 |
return bs->drv->bdrv_check(bs, res);
|
| 740 |
} |
| 741 |
|
| 742 |
#define COMMIT_BUF_SECTORS 2048 |
| 743 |
|
| 744 |
/* commit COW file into the raw image */
|
| 745 |
int bdrv_commit(BlockDriverState *bs)
|
| 746 |
{
|
| 747 |
BlockDriver *drv = bs->drv; |
| 748 |
int64_t sector, total_sectors; |
| 749 |
int n, ro, open_flags;
|
| 750 |
int ret = 0, rw_ret = 0; |
| 751 |
uint8_t *buf; |
| 752 |
char filename[1024]; |
| 753 |
BlockDriverState *bs_rw, *bs_ro; |
| 754 |
|
| 755 |
if (!drv)
|
| 756 |
return -ENOMEDIUM;
|
| 757 |
|
| 758 |
if (!bs->backing_hd) {
|
| 759 |
return -ENOTSUP;
|
| 760 |
} |
| 761 |
|
| 762 |
if (bs->backing_hd->keep_read_only) {
|
| 763 |
return -EACCES;
|
| 764 |
} |
| 765 |
|
| 766 |
ro = bs->backing_hd->read_only; |
| 767 |
strncpy(filename, bs->backing_hd->filename, sizeof(filename));
|
| 768 |
open_flags = bs->backing_hd->open_flags; |
| 769 |
|
| 770 |
if (ro) {
|
| 771 |
/* re-open as RW */
|
| 772 |
bdrv_delete(bs->backing_hd); |
| 773 |
bs->backing_hd = NULL;
|
| 774 |
bs_rw = bdrv_new("");
|
| 775 |
rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv); |
| 776 |
if (rw_ret < 0) { |
| 777 |
bdrv_delete(bs_rw); |
| 778 |
/* try to re-open read-only */
|
| 779 |
bs_ro = bdrv_new("");
|
| 780 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
| 781 |
if (ret < 0) { |
| 782 |
bdrv_delete(bs_ro); |
| 783 |
/* drive not functional anymore */
|
| 784 |
bs->drv = NULL;
|
| 785 |
return ret;
|
| 786 |
} |
| 787 |
bs->backing_hd = bs_ro; |
| 788 |
return rw_ret;
|
| 789 |
} |
| 790 |
bs->backing_hd = bs_rw; |
| 791 |
} |
| 792 |
|
| 793 |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
| 794 |
buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
| 795 |
|
| 796 |
for (sector = 0; sector < total_sectors; sector += n) { |
| 797 |
if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
|
| 798 |
|
| 799 |
if (bdrv_read(bs, sector, buf, n) != 0) { |
| 800 |
ret = -EIO; |
| 801 |
goto ro_cleanup;
|
| 802 |
} |
| 803 |
|
| 804 |
if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { |
| 805 |
ret = -EIO; |
| 806 |
goto ro_cleanup;
|
| 807 |
} |
| 808 |
} |
| 809 |
} |
| 810 |
|
| 811 |
if (drv->bdrv_make_empty) {
|
| 812 |
ret = drv->bdrv_make_empty(bs); |
| 813 |
bdrv_flush(bs); |
| 814 |
} |
| 815 |
|
| 816 |
/*
|
| 817 |
* Make sure all data we wrote to the backing device is actually
|
| 818 |
* stable on disk.
|
| 819 |
*/
|
| 820 |
if (bs->backing_hd)
|
| 821 |
bdrv_flush(bs->backing_hd); |
| 822 |
|
| 823 |
ro_cleanup:
|
| 824 |
qemu_free(buf); |
| 825 |
|
| 826 |
if (ro) {
|
| 827 |
/* re-open as RO */
|
| 828 |
bdrv_delete(bs->backing_hd); |
| 829 |
bs->backing_hd = NULL;
|
| 830 |
bs_ro = bdrv_new("");
|
| 831 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
| 832 |
if (ret < 0) { |
| 833 |
bdrv_delete(bs_ro); |
| 834 |
/* drive not functional anymore */
|
| 835 |
bs->drv = NULL;
|
| 836 |
return ret;
|
| 837 |
} |
| 838 |
bs->backing_hd = bs_ro; |
| 839 |
bs->backing_hd->keep_read_only = 0;
|
| 840 |
} |
| 841 |
|
| 842 |
return ret;
|
| 843 |
} |
| 844 |
|
| 845 |
void bdrv_commit_all(void) |
| 846 |
{
|
| 847 |
BlockDriverState *bs; |
| 848 |
|
| 849 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 850 |
bdrv_commit(bs); |
| 851 |
} |
| 852 |
} |
| 853 |
|
| 854 |
/*
|
| 855 |
* Return values:
|
| 856 |
* 0 - success
|
| 857 |
* -EINVAL - backing format specified, but no file
|
| 858 |
* -ENOSPC - can't update the backing file because no space is left in the
|
| 859 |
* image file header
|
| 860 |
* -ENOTSUP - format driver doesn't support changing the backing file
|
| 861 |
*/
|
| 862 |
int bdrv_change_backing_file(BlockDriverState *bs,
|
| 863 |
const char *backing_file, const char *backing_fmt) |
| 864 |
{
|
| 865 |
BlockDriver *drv = bs->drv; |
| 866 |
|
| 867 |
if (drv->bdrv_change_backing_file != NULL) { |
| 868 |
return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
|
| 869 |
} else {
|
| 870 |
return -ENOTSUP;
|
| 871 |
} |
| 872 |
} |
| 873 |
|
| 874 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
| 875 |
size_t size) |
| 876 |
{
|
| 877 |
int64_t len; |
| 878 |
|
| 879 |
if (!bdrv_is_inserted(bs))
|
| 880 |
return -ENOMEDIUM;
|
| 881 |
|
| 882 |
if (bs->growable)
|
| 883 |
return 0; |
| 884 |
|
| 885 |
len = bdrv_getlength(bs); |
| 886 |
|
| 887 |
if (offset < 0) |
| 888 |
return -EIO;
|
| 889 |
|
| 890 |
if ((offset > len) || (len - offset < size))
|
| 891 |
return -EIO;
|
| 892 |
|
| 893 |
return 0; |
| 894 |
} |
| 895 |
|
| 896 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
| 897 |
int nb_sectors)
|
| 898 |
{
|
| 899 |
return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
|
| 900 |
nb_sectors * BDRV_SECTOR_SIZE); |
| 901 |
} |
| 902 |
|
| 903 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
| 904 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
| 905 |
uint8_t *buf, int nb_sectors)
|
| 906 |
{
|
| 907 |
BlockDriver *drv = bs->drv; |
| 908 |
|
| 909 |
if (!drv)
|
| 910 |
return -ENOMEDIUM;
|
| 911 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 912 |
return -EIO;
|
| 913 |
|
| 914 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
| 915 |
} |
| 916 |
|
| 917 |
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
| 918 |
int nb_sectors, int dirty) |
| 919 |
{
|
| 920 |
int64_t start, end; |
| 921 |
unsigned long val, idx, bit; |
| 922 |
|
| 923 |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
| 924 |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
| 925 |
|
| 926 |
for (; start <= end; start++) {
|
| 927 |
idx = start / (sizeof(unsigned long) * 8); |
| 928 |
bit = start % (sizeof(unsigned long) * 8); |
| 929 |
val = bs->dirty_bitmap[idx]; |
| 930 |
if (dirty) {
|
| 931 |
if (!(val & (1 << bit))) { |
| 932 |
bs->dirty_count++; |
| 933 |
val |= 1 << bit;
|
| 934 |
} |
| 935 |
} else {
|
| 936 |
if (val & (1 << bit)) { |
| 937 |
bs->dirty_count--; |
| 938 |
val &= ~(1 << bit);
|
| 939 |
} |
| 940 |
} |
| 941 |
bs->dirty_bitmap[idx] = val; |
| 942 |
} |
| 943 |
} |
| 944 |
|
| 945 |
/* Return < 0 if error. Important errors are:
|
| 946 |
-EIO generic I/O error (may happen for all errors)
|
| 947 |
-ENOMEDIUM No media inserted.
|
| 948 |
-EINVAL Invalid sector number or nb_sectors
|
| 949 |
-EACCES Trying to write a read-only device
|
| 950 |
*/
|
| 951 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
| 952 |
const uint8_t *buf, int nb_sectors) |
| 953 |
{
|
| 954 |
BlockDriver *drv = bs->drv; |
| 955 |
if (!bs->drv)
|
| 956 |
return -ENOMEDIUM;
|
| 957 |
if (bs->read_only)
|
| 958 |
return -EACCES;
|
| 959 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 960 |
return -EIO;
|
| 961 |
|
| 962 |
if (bs->dirty_bitmap) {
|
| 963 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
| 964 |
} |
| 965 |
|
| 966 |
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
| 967 |
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
| 968 |
} |
| 969 |
|
| 970 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
| 971 |
} |
| 972 |
|
| 973 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
| 974 |
void *buf, int count1) |
| 975 |
{
|
| 976 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
| 977 |
int len, nb_sectors, count;
|
| 978 |
int64_t sector_num; |
| 979 |
int ret;
|
| 980 |
|
| 981 |
count = count1; |
| 982 |
/* first read to align to sector start */
|
| 983 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
| 984 |
if (len > count)
|
| 985 |
len = count; |
| 986 |
sector_num = offset >> BDRV_SECTOR_BITS; |
| 987 |
if (len > 0) { |
| 988 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 989 |
return ret;
|
| 990 |
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
| 991 |
count -= len; |
| 992 |
if (count == 0) |
| 993 |
return count1;
|
| 994 |
sector_num++; |
| 995 |
buf += len; |
| 996 |
} |
| 997 |
|
| 998 |
/* read the sectors "in place" */
|
| 999 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
| 1000 |
if (nb_sectors > 0) { |
| 1001 |
if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
| 1002 |
return ret;
|
| 1003 |
sector_num += nb_sectors; |
| 1004 |
len = nb_sectors << BDRV_SECTOR_BITS; |
| 1005 |
buf += len; |
| 1006 |
count -= len; |
| 1007 |
} |
| 1008 |
|
| 1009 |
/* add data from the last sector */
|
| 1010 |
if (count > 0) { |
| 1011 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1012 |
return ret;
|
| 1013 |
memcpy(buf, tmp_buf, count); |
| 1014 |
} |
| 1015 |
return count1;
|
| 1016 |
} |
| 1017 |
|
| 1018 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
| 1019 |
const void *buf, int count1) |
| 1020 |
{
|
| 1021 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
| 1022 |
int len, nb_sectors, count;
|
| 1023 |
int64_t sector_num; |
| 1024 |
int ret;
|
| 1025 |
|
| 1026 |
count = count1; |
| 1027 |
/* first write to align to sector start */
|
| 1028 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
| 1029 |
if (len > count)
|
| 1030 |
len = count; |
| 1031 |
sector_num = offset >> BDRV_SECTOR_BITS; |
| 1032 |
if (len > 0) { |
| 1033 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1034 |
return ret;
|
| 1035 |
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
| 1036 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
| 1037 |
return ret;
|
| 1038 |
count -= len; |
| 1039 |
if (count == 0) |
| 1040 |
return count1;
|
| 1041 |
sector_num++; |
| 1042 |
buf += len; |
| 1043 |
} |
| 1044 |
|
| 1045 |
/* write the sectors "in place" */
|
| 1046 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
| 1047 |
if (nb_sectors > 0) { |
| 1048 |
if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
| 1049 |
return ret;
|
| 1050 |
sector_num += nb_sectors; |
| 1051 |
len = nb_sectors << BDRV_SECTOR_BITS; |
| 1052 |
buf += len; |
| 1053 |
count -= len; |
| 1054 |
} |
| 1055 |
|
| 1056 |
/* add data from the last sector */
|
| 1057 |
if (count > 0) { |
| 1058 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1059 |
return ret;
|
| 1060 |
memcpy(tmp_buf, buf, count); |
| 1061 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
| 1062 |
return ret;
|
| 1063 |
} |
| 1064 |
return count1;
|
| 1065 |
} |
| 1066 |
|
| 1067 |
/*
|
| 1068 |
* Writes to the file and ensures that no writes are reordered across this
|
| 1069 |
* request (acts as a barrier)
|
| 1070 |
*
|
| 1071 |
* Returns 0 on success, -errno in error cases.
|
| 1072 |
*/
|
| 1073 |
int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
|
| 1074 |
const void *buf, int count) |
| 1075 |
{
|
| 1076 |
int ret;
|
| 1077 |
|
| 1078 |
ret = bdrv_pwrite(bs, offset, buf, count); |
| 1079 |
if (ret < 0) { |
| 1080 |
return ret;
|
| 1081 |
} |
| 1082 |
|
| 1083 |
/* No flush needed for cache=writethrough, it uses O_DSYNC */
|
| 1084 |
if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) { |
| 1085 |
bdrv_flush(bs); |
| 1086 |
} |
| 1087 |
|
| 1088 |
return 0; |
| 1089 |
} |
| 1090 |
|
| 1091 |
/*
|
| 1092 |
* Writes to the file and ensures that no writes are reordered across this
|
| 1093 |
* request (acts as a barrier)
|
| 1094 |
*
|
| 1095 |
* Returns 0 on success, -errno in error cases.
|
| 1096 |
*/
|
| 1097 |
int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
|
| 1098 |
const uint8_t *buf, int nb_sectors) |
| 1099 |
{
|
| 1100 |
return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
|
| 1101 |
buf, BDRV_SECTOR_SIZE * nb_sectors); |
| 1102 |
} |
| 1103 |
|
| 1104 |
/**
|
| 1105 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
| 1106 |
*/
|
| 1107 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
| 1108 |
{
|
| 1109 |
BlockDriver *drv = bs->drv; |
| 1110 |
int ret;
|
| 1111 |
if (!drv)
|
| 1112 |
return -ENOMEDIUM;
|
| 1113 |
if (!drv->bdrv_truncate)
|
| 1114 |
return -ENOTSUP;
|
| 1115 |
if (bs->read_only)
|
| 1116 |
return -EACCES;
|
| 1117 |
ret = drv->bdrv_truncate(bs, offset); |
| 1118 |
if (ret == 0) { |
| 1119 |
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
| 1120 |
} |
| 1121 |
return ret;
|
| 1122 |
} |
| 1123 |
|
| 1124 |
/**
|
| 1125 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
| 1126 |
*/
|
| 1127 |
int64_t bdrv_getlength(BlockDriverState *bs) |
| 1128 |
{
|
| 1129 |
BlockDriver *drv = bs->drv; |
| 1130 |
if (!drv)
|
| 1131 |
return -ENOMEDIUM;
|
| 1132 |
|
| 1133 |
/* Fixed size devices use the total_sectors value for speed instead of
|
| 1134 |
issuing a length query (like lseek) on each call. Also, legacy block
|
| 1135 |
drivers don't provide a bdrv_getlength function and must use
|
| 1136 |
total_sectors. */
|
| 1137 |
if (!bs->growable || !drv->bdrv_getlength) {
|
| 1138 |
return bs->total_sectors * BDRV_SECTOR_SIZE;
|
| 1139 |
} |
| 1140 |
return drv->bdrv_getlength(bs);
|
| 1141 |
} |
| 1142 |
|
| 1143 |
/* return 0 as number of sectors if no device present or error */
|
| 1144 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
| 1145 |
{
|
| 1146 |
int64_t length; |
| 1147 |
length = bdrv_getlength(bs); |
| 1148 |
if (length < 0) |
| 1149 |
length = 0;
|
| 1150 |
else
|
| 1151 |
length = length >> BDRV_SECTOR_BITS; |
| 1152 |
*nb_sectors_ptr = length; |
| 1153 |
} |
| 1154 |
|
| 1155 |
struct partition {
|
| 1156 |
uint8_t boot_ind; /* 0x80 - active */
|
| 1157 |
uint8_t head; /* starting head */
|
| 1158 |
uint8_t sector; /* starting sector */
|
| 1159 |
uint8_t cyl; /* starting cylinder */
|
| 1160 |
uint8_t sys_ind; /* What partition type */
|
| 1161 |
uint8_t end_head; /* end head */
|
| 1162 |
uint8_t end_sector; /* end sector */
|
| 1163 |
uint8_t end_cyl; /* end cylinder */
|
| 1164 |
uint32_t start_sect; /* starting sector counting from 0 */
|
| 1165 |
uint32_t nr_sects; /* nr of sectors in partition */
|
| 1166 |
} __attribute__((packed)); |
| 1167 |
|
| 1168 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
| 1169 |
static int guess_disk_lchs(BlockDriverState *bs, |
| 1170 |
int *pcylinders, int *pheads, int *psectors) |
| 1171 |
{
|
| 1172 |
uint8_t buf[BDRV_SECTOR_SIZE]; |
| 1173 |
int ret, i, heads, sectors, cylinders;
|
| 1174 |
struct partition *p;
|
| 1175 |
uint32_t nr_sects; |
| 1176 |
uint64_t nb_sectors; |
| 1177 |
|
| 1178 |
bdrv_get_geometry(bs, &nb_sectors); |
| 1179 |
|
| 1180 |
ret = bdrv_read(bs, 0, buf, 1); |
| 1181 |
if (ret < 0) |
| 1182 |
return -1; |
| 1183 |
/* test msdos magic */
|
| 1184 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
| 1185 |
return -1; |
| 1186 |
for(i = 0; i < 4; i++) { |
| 1187 |
p = ((struct partition *)(buf + 0x1be)) + i; |
| 1188 |
nr_sects = le32_to_cpu(p->nr_sects); |
| 1189 |
if (nr_sects && p->end_head) {
|
| 1190 |
/* We make the assumption that the partition terminates on
|
| 1191 |
a cylinder boundary */
|
| 1192 |
heads = p->end_head + 1;
|
| 1193 |
sectors = p->end_sector & 63;
|
| 1194 |
if (sectors == 0) |
| 1195 |
continue;
|
| 1196 |
cylinders = nb_sectors / (heads * sectors); |
| 1197 |
if (cylinders < 1 || cylinders > 16383) |
| 1198 |
continue;
|
| 1199 |
*pheads = heads; |
| 1200 |
*psectors = sectors; |
| 1201 |
*pcylinders = cylinders; |
| 1202 |
#if 0
|
| 1203 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
| 1204 |
cylinders, heads, sectors);
|
| 1205 |
#endif
|
| 1206 |
return 0; |
| 1207 |
} |
| 1208 |
} |
| 1209 |
return -1; |
| 1210 |
} |
| 1211 |
|
| 1212 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
| 1213 |
{
|
| 1214 |
int translation, lba_detected = 0; |
| 1215 |
int cylinders, heads, secs;
|
| 1216 |
uint64_t nb_sectors; |
| 1217 |
|
| 1218 |
/* if a geometry hint is available, use it */
|
| 1219 |
bdrv_get_geometry(bs, &nb_sectors); |
| 1220 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
| 1221 |
translation = bdrv_get_translation_hint(bs); |
| 1222 |
if (cylinders != 0) { |
| 1223 |
*pcyls = cylinders; |
| 1224 |
*pheads = heads; |
| 1225 |
*psecs = secs; |
| 1226 |
} else {
|
| 1227 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
| 1228 |
if (heads > 16) { |
| 1229 |
/* if heads > 16, it means that a BIOS LBA
|
| 1230 |
translation was active, so the default
|
| 1231 |
hardware geometry is OK */
|
| 1232 |
lba_detected = 1;
|
| 1233 |
goto default_geometry;
|
| 1234 |
} else {
|
| 1235 |
*pcyls = cylinders; |
| 1236 |
*pheads = heads; |
| 1237 |
*psecs = secs; |
| 1238 |
/* disable any translation to be in sync with
|
| 1239 |
the logical geometry */
|
| 1240 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
| 1241 |
bdrv_set_translation_hint(bs, |
| 1242 |
BIOS_ATA_TRANSLATION_NONE); |
| 1243 |
} |
| 1244 |
} |
| 1245 |
} else {
|
| 1246 |
default_geometry:
|
| 1247 |
/* if no geometry, use a standard physical disk geometry */
|
| 1248 |
cylinders = nb_sectors / (16 * 63); |
| 1249 |
|
| 1250 |
if (cylinders > 16383) |
| 1251 |
cylinders = 16383;
|
| 1252 |
else if (cylinders < 2) |
| 1253 |
cylinders = 2;
|
| 1254 |
*pcyls = cylinders; |
| 1255 |
*pheads = 16;
|
| 1256 |
*psecs = 63;
|
| 1257 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
| 1258 |
if ((*pcyls * *pheads) <= 131072) { |
| 1259 |
bdrv_set_translation_hint(bs, |
| 1260 |
BIOS_ATA_TRANSLATION_LARGE); |
| 1261 |
} else {
|
| 1262 |
bdrv_set_translation_hint(bs, |
| 1263 |
BIOS_ATA_TRANSLATION_LBA); |
| 1264 |
} |
| 1265 |
} |
| 1266 |
} |
| 1267 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
| 1268 |
} |
| 1269 |
} |
| 1270 |
|
| 1271 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
| 1272 |
int cyls, int heads, int secs) |
| 1273 |
{
|
| 1274 |
bs->cyls = cyls; |
| 1275 |
bs->heads = heads; |
| 1276 |
bs->secs = secs; |
| 1277 |
} |
| 1278 |
|
| 1279 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
| 1280 |
{
|
| 1281 |
bs->type = type; |
| 1282 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
| 1283 |
type == BDRV_TYPE_FLOPPY)); |
| 1284 |
} |
| 1285 |
|
| 1286 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
| 1287 |
{
|
| 1288 |
bs->translation = translation; |
| 1289 |
} |
| 1290 |
|
| 1291 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
| 1292 |
int *pcyls, int *pheads, int *psecs) |
| 1293 |
{
|
| 1294 |
*pcyls = bs->cyls; |
| 1295 |
*pheads = bs->heads; |
| 1296 |
*psecs = bs->secs; |
| 1297 |
} |
| 1298 |
|
| 1299 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
| 1300 |
{
|
| 1301 |
return bs->type;
|
| 1302 |
} |
| 1303 |
|
| 1304 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
| 1305 |
{
|
| 1306 |
return bs->translation;
|
| 1307 |
} |
| 1308 |
|
| 1309 |
void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
|
| 1310 |
BlockErrorAction on_write_error) |
| 1311 |
{
|
| 1312 |
bs->on_read_error = on_read_error; |
| 1313 |
bs->on_write_error = on_write_error; |
| 1314 |
} |
| 1315 |
|
| 1316 |
BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
|
| 1317 |
{
|
| 1318 |
return is_read ? bs->on_read_error : bs->on_write_error;
|
| 1319 |
} |
| 1320 |
|
| 1321 |
void bdrv_set_removable(BlockDriverState *bs, int removable) |
| 1322 |
{
|
| 1323 |
bs->removable = removable; |
| 1324 |
if (removable && bs == bs_snapshots) {
|
| 1325 |
bs_snapshots = NULL;
|
| 1326 |
} |
| 1327 |
} |
| 1328 |
|
| 1329 |
int bdrv_is_removable(BlockDriverState *bs)
|
| 1330 |
{
|
| 1331 |
return bs->removable;
|
| 1332 |
} |
| 1333 |
|
| 1334 |
int bdrv_is_read_only(BlockDriverState *bs)
|
| 1335 |
{
|
| 1336 |
return bs->read_only;
|
| 1337 |
} |
| 1338 |
|
| 1339 |
int bdrv_is_sg(BlockDriverState *bs)
|
| 1340 |
{
|
| 1341 |
return bs->sg;
|
| 1342 |
} |
| 1343 |
|
| 1344 |
int bdrv_enable_write_cache(BlockDriverState *bs)
|
| 1345 |
{
|
| 1346 |
return bs->enable_write_cache;
|
| 1347 |
} |
| 1348 |
|
| 1349 |
/* XXX: no longer used */
|
| 1350 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
| 1351 |
void (*change_cb)(void *opaque), void *opaque) |
| 1352 |
{
|
| 1353 |
bs->change_cb = change_cb; |
| 1354 |
bs->change_opaque = opaque; |
| 1355 |
} |
| 1356 |
|
| 1357 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
| 1358 |
{
|
| 1359 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 1360 |
return 1; |
| 1361 |
return bs->encrypted;
|
| 1362 |
} |
| 1363 |
|
| 1364 |
int bdrv_key_required(BlockDriverState *bs)
|
| 1365 |
{
|
| 1366 |
BlockDriverState *backing_hd = bs->backing_hd; |
| 1367 |
|
| 1368 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
| 1369 |
return 1; |
| 1370 |
return (bs->encrypted && !bs->valid_key);
|
| 1371 |
} |
| 1372 |
|
| 1373 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 1374 |
{
|
| 1375 |
int ret;
|
| 1376 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
| 1377 |
ret = bdrv_set_key(bs->backing_hd, key); |
| 1378 |
if (ret < 0) |
| 1379 |
return ret;
|
| 1380 |
if (!bs->encrypted)
|
| 1381 |
return 0; |
| 1382 |
} |
| 1383 |
if (!bs->encrypted) {
|
| 1384 |
return -EINVAL;
|
| 1385 |
} else if (!bs->drv || !bs->drv->bdrv_set_key) { |
| 1386 |
return -ENOMEDIUM;
|
| 1387 |
} |
| 1388 |
ret = bs->drv->bdrv_set_key(bs, key); |
| 1389 |
if (ret < 0) { |
| 1390 |
bs->valid_key = 0;
|
| 1391 |
} else if (!bs->valid_key) { |
| 1392 |
bs->valid_key = 1;
|
| 1393 |
/* call the change callback now, we skipped it on open */
|
| 1394 |
bs->media_changed = 1;
|
| 1395 |
if (bs->change_cb)
|
| 1396 |
bs->change_cb(bs->change_opaque); |
| 1397 |
} |
| 1398 |
return ret;
|
| 1399 |
} |
| 1400 |
|
| 1401 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
| 1402 |
{
|
| 1403 |
if (!bs->drv) {
|
| 1404 |
buf[0] = '\0'; |
| 1405 |
} else {
|
| 1406 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
| 1407 |
} |
| 1408 |
} |
| 1409 |
|
| 1410 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
| 1411 |
void *opaque)
|
| 1412 |
{
|
| 1413 |
BlockDriver *drv; |
| 1414 |
|
| 1415 |
QLIST_FOREACH(drv, &bdrv_drivers, list) {
|
| 1416 |
it(opaque, drv->format_name); |
| 1417 |
} |
| 1418 |
} |
| 1419 |
|
| 1420 |
BlockDriverState *bdrv_find(const char *name) |
| 1421 |
{
|
| 1422 |
BlockDriverState *bs; |
| 1423 |
|
| 1424 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 1425 |
if (!strcmp(name, bs->device_name)) {
|
| 1426 |
return bs;
|
| 1427 |
} |
| 1428 |
} |
| 1429 |
return NULL; |
| 1430 |
} |
| 1431 |
|
| 1432 |
BlockDriverState *bdrv_next(BlockDriverState *bs) |
| 1433 |
{
|
| 1434 |
if (!bs) {
|
| 1435 |
return QTAILQ_FIRST(&bdrv_states);
|
| 1436 |
} |
| 1437 |
return QTAILQ_NEXT(bs, list);
|
| 1438 |
} |
| 1439 |
|
| 1440 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
| 1441 |
{
|
| 1442 |
BlockDriverState *bs; |
| 1443 |
|
| 1444 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 1445 |
it(opaque, bs); |
| 1446 |
} |
| 1447 |
} |
| 1448 |
|
| 1449 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
| 1450 |
{
|
| 1451 |
return bs->device_name;
|
| 1452 |
} |
| 1453 |
|
| 1454 |
void bdrv_flush(BlockDriverState *bs)
|
| 1455 |
{
|
| 1456 |
if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
| 1457 |
return;
|
| 1458 |
} |
| 1459 |
|
| 1460 |
if (bs->drv && bs->drv->bdrv_flush)
|
| 1461 |
bs->drv->bdrv_flush(bs); |
| 1462 |
} |
| 1463 |
|
| 1464 |
void bdrv_flush_all(void) |
| 1465 |
{
|
| 1466 |
BlockDriverState *bs; |
| 1467 |
|
| 1468 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 1469 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
| 1470 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
|
| 1471 |
bdrv_flush(bs); |
| 1472 |
} |
| 1473 |
} |
| 1474 |
} |
| 1475 |
|
| 1476 |
int bdrv_has_zero_init(BlockDriverState *bs)
|
| 1477 |
{
|
| 1478 |
assert(bs->drv); |
| 1479 |
|
| 1480 |
if (bs->drv->bdrv_has_zero_init) {
|
| 1481 |
return bs->drv->bdrv_has_zero_init(bs);
|
| 1482 |
} |
| 1483 |
|
| 1484 |
return 1; |
| 1485 |
} |
| 1486 |
|
| 1487 |
/*
|
| 1488 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
| 1489 |
* not implementing the functionality are assumed to not support backing files,
|
| 1490 |
* hence all their sectors are reported as allocated.
|
| 1491 |
*
|
| 1492 |
* 'pnum' is set to the number of sectors (including and immediately following
|
| 1493 |
* the specified sector) that are known to be in the same
|
| 1494 |
* allocated/unallocated state.
|
| 1495 |
*
|
| 1496 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
| 1497 |
*/
|
| 1498 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
| 1499 |
int *pnum)
|
| 1500 |
{
|
| 1501 |
int64_t n; |
| 1502 |
if (!bs->drv->bdrv_is_allocated) {
|
| 1503 |
if (sector_num >= bs->total_sectors) {
|
| 1504 |
*pnum = 0;
|
| 1505 |
return 0; |
| 1506 |
} |
| 1507 |
n = bs->total_sectors - sector_num; |
| 1508 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
| 1509 |
return 1; |
| 1510 |
} |
| 1511 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
| 1512 |
} |
| 1513 |
|
| 1514 |
void bdrv_mon_event(const BlockDriverState *bdrv, |
| 1515 |
BlockMonEventAction action, int is_read)
|
| 1516 |
{
|
| 1517 |
QObject *data; |
| 1518 |
const char *action_str; |
| 1519 |
|
| 1520 |
switch (action) {
|
| 1521 |
case BDRV_ACTION_REPORT:
|
| 1522 |
action_str = "report";
|
| 1523 |
break;
|
| 1524 |
case BDRV_ACTION_IGNORE:
|
| 1525 |
action_str = "ignore";
|
| 1526 |
break;
|
| 1527 |
case BDRV_ACTION_STOP:
|
| 1528 |
action_str = "stop";
|
| 1529 |
break;
|
| 1530 |
default:
|
| 1531 |
abort(); |
| 1532 |
} |
| 1533 |
|
| 1534 |
data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
|
| 1535 |
bdrv->device_name, |
| 1536 |
action_str, |
| 1537 |
is_read ? "read" : "write"); |
| 1538 |
monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); |
| 1539 |
|
| 1540 |
qobject_decref(data); |
| 1541 |
} |
| 1542 |
|
| 1543 |
static void bdrv_print_dict(QObject *obj, void *opaque) |
| 1544 |
{
|
| 1545 |
QDict *bs_dict; |
| 1546 |
Monitor *mon = opaque; |
| 1547 |
|
| 1548 |
bs_dict = qobject_to_qdict(obj); |
| 1549 |
|
| 1550 |
monitor_printf(mon, "%s: type=%s removable=%d",
|
| 1551 |
qdict_get_str(bs_dict, "device"),
|
| 1552 |
qdict_get_str(bs_dict, "type"),
|
| 1553 |
qdict_get_bool(bs_dict, "removable"));
|
| 1554 |
|
| 1555 |
if (qdict_get_bool(bs_dict, "removable")) { |
| 1556 |
monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); |
| 1557 |
} |
| 1558 |
|
| 1559 |
if (qdict_haskey(bs_dict, "inserted")) { |
| 1560 |
QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
|
| 1561 |
|
| 1562 |
monitor_printf(mon, " file=");
|
| 1563 |
monitor_print_filename(mon, qdict_get_str(qdict, "file"));
|
| 1564 |
if (qdict_haskey(qdict, "backing_file")) { |
| 1565 |
monitor_printf(mon, " backing_file=");
|
| 1566 |
monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
|
| 1567 |
} |
| 1568 |
monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
|
| 1569 |
qdict_get_bool(qdict, "ro"),
|
| 1570 |
qdict_get_str(qdict, "drv"),
|
| 1571 |
qdict_get_bool(qdict, "encrypted"));
|
| 1572 |
} else {
|
| 1573 |
monitor_printf(mon, " [not inserted]");
|
| 1574 |
} |
| 1575 |
|
| 1576 |
monitor_printf(mon, "\n");
|
| 1577 |
} |
| 1578 |
|
| 1579 |
void bdrv_info_print(Monitor *mon, const QObject *data) |
| 1580 |
{
|
| 1581 |
qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); |
| 1582 |
} |
| 1583 |
|
| 1584 |
void bdrv_info(Monitor *mon, QObject **ret_data)
|
| 1585 |
{
|
| 1586 |
QList *bs_list; |
| 1587 |
BlockDriverState *bs; |
| 1588 |
|
| 1589 |
bs_list = qlist_new(); |
| 1590 |
|
| 1591 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 1592 |
QObject *bs_obj; |
| 1593 |
const char *type = "unknown"; |
| 1594 |
|
| 1595 |
switch(bs->type) {
|
| 1596 |
case BDRV_TYPE_HD:
|
| 1597 |
type = "hd";
|
| 1598 |
break;
|
| 1599 |
case BDRV_TYPE_CDROM:
|
| 1600 |
type = "cdrom";
|
| 1601 |
break;
|
| 1602 |
case BDRV_TYPE_FLOPPY:
|
| 1603 |
type = "floppy";
|
| 1604 |
break;
|
| 1605 |
} |
| 1606 |
|
| 1607 |
bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
|
| 1608 |
"'removable': %i, 'locked': %i }",
|
| 1609 |
bs->device_name, type, bs->removable, |
| 1610 |
bs->locked); |
| 1611 |
|
| 1612 |
if (bs->drv) {
|
| 1613 |
QObject *obj; |
| 1614 |
QDict *bs_dict = qobject_to_qdict(bs_obj); |
| 1615 |
|
| 1616 |
obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
|
| 1617 |
"'encrypted': %i }",
|
| 1618 |
bs->filename, bs->read_only, |
| 1619 |
bs->drv->format_name, |
| 1620 |
bdrv_is_encrypted(bs)); |
| 1621 |
if (bs->backing_file[0] != '\0') { |
| 1622 |
QDict *qdict = qobject_to_qdict(obj); |
| 1623 |
qdict_put(qdict, "backing_file",
|
| 1624 |
qstring_from_str(bs->backing_file)); |
| 1625 |
} |
| 1626 |
|
| 1627 |
qdict_put_obj(bs_dict, "inserted", obj);
|
| 1628 |
} |
| 1629 |
qlist_append_obj(bs_list, bs_obj); |
| 1630 |
} |
| 1631 |
|
| 1632 |
*ret_data = QOBJECT(bs_list); |
| 1633 |
} |
| 1634 |
|
| 1635 |
static void bdrv_stats_iter(QObject *data, void *opaque) |
| 1636 |
{
|
| 1637 |
QDict *qdict; |
| 1638 |
Monitor *mon = opaque; |
| 1639 |
|
| 1640 |
qdict = qobject_to_qdict(data); |
| 1641 |
monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); |
| 1642 |
|
| 1643 |
qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
|
| 1644 |
monitor_printf(mon, " rd_bytes=%" PRId64
|
| 1645 |
" wr_bytes=%" PRId64
|
| 1646 |
" rd_operations=%" PRId64
|
| 1647 |
" wr_operations=%" PRId64
|
| 1648 |
"\n",
|
| 1649 |
qdict_get_int(qdict, "rd_bytes"),
|
| 1650 |
qdict_get_int(qdict, "wr_bytes"),
|
| 1651 |
qdict_get_int(qdict, "rd_operations"),
|
| 1652 |
qdict_get_int(qdict, "wr_operations"));
|
| 1653 |
} |
| 1654 |
|
| 1655 |
void bdrv_stats_print(Monitor *mon, const QObject *data) |
| 1656 |
{
|
| 1657 |
qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); |
| 1658 |
} |
| 1659 |
|
| 1660 |
static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
|
| 1661 |
{
|
| 1662 |
QObject *res; |
| 1663 |
QDict *dict; |
| 1664 |
|
| 1665 |
res = qobject_from_jsonf("{ 'stats': {"
|
| 1666 |
"'rd_bytes': %" PRId64 "," |
| 1667 |
"'wr_bytes': %" PRId64 "," |
| 1668 |
"'rd_operations': %" PRId64 "," |
| 1669 |
"'wr_operations': %" PRId64 "," |
| 1670 |
"'wr_highest_offset': %" PRId64
|
| 1671 |
"} }",
|
| 1672 |
bs->rd_bytes, bs->wr_bytes, |
| 1673 |
bs->rd_ops, bs->wr_ops, |
| 1674 |
bs->wr_highest_sector * |
| 1675 |
(uint64_t)BDRV_SECTOR_SIZE); |
| 1676 |
dict = qobject_to_qdict(res); |
| 1677 |
|
| 1678 |
if (*bs->device_name) {
|
| 1679 |
qdict_put(dict, "device", qstring_from_str(bs->device_name));
|
| 1680 |
} |
| 1681 |
|
| 1682 |
if (bs->file) {
|
| 1683 |
QObject *parent = bdrv_info_stats_bs(bs->file); |
| 1684 |
qdict_put_obj(dict, "parent", parent);
|
| 1685 |
} |
| 1686 |
|
| 1687 |
return res;
|
| 1688 |
} |
| 1689 |
|
| 1690 |
void bdrv_info_stats(Monitor *mon, QObject **ret_data)
|
| 1691 |
{
|
| 1692 |
QObject *obj; |
| 1693 |
QList *devices; |
| 1694 |
BlockDriverState *bs; |
| 1695 |
|
| 1696 |
devices = qlist_new(); |
| 1697 |
|
| 1698 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 1699 |
obj = bdrv_info_stats_bs(bs); |
| 1700 |
qlist_append_obj(devices, obj); |
| 1701 |
} |
| 1702 |
|
| 1703 |
*ret_data = QOBJECT(devices); |
| 1704 |
} |
| 1705 |
|
| 1706 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 1707 |
{
|
| 1708 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 1709 |
return bs->backing_file;
|
| 1710 |
else if (bs->encrypted) |
| 1711 |
return bs->filename;
|
| 1712 |
else
|
| 1713 |
return NULL; |
| 1714 |
} |
| 1715 |
|
| 1716 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
| 1717 |
char *filename, int filename_size) |
| 1718 |
{
|
| 1719 |
if (!bs->backing_file) {
|
| 1720 |
pstrcpy(filename, filename_size, "");
|
| 1721 |
} else {
|
| 1722 |
pstrcpy(filename, filename_size, bs->backing_file); |
| 1723 |
} |
| 1724 |
} |
| 1725 |
|
| 1726 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
| 1727 |
const uint8_t *buf, int nb_sectors) |
| 1728 |
{
|
| 1729 |
BlockDriver *drv = bs->drv; |
| 1730 |
if (!drv)
|
| 1731 |
return -ENOMEDIUM;
|
| 1732 |
if (!drv->bdrv_write_compressed)
|
| 1733 |
return -ENOTSUP;
|
| 1734 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1735 |
return -EIO;
|
| 1736 |
|
| 1737 |
if (bs->dirty_bitmap) {
|
| 1738 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
| 1739 |
} |
| 1740 |
|
| 1741 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
| 1742 |
} |
| 1743 |
|
| 1744 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
| 1745 |
{
|
| 1746 |
BlockDriver *drv = bs->drv; |
| 1747 |
if (!drv)
|
| 1748 |
return -ENOMEDIUM;
|
| 1749 |
if (!drv->bdrv_get_info)
|
| 1750 |
return -ENOTSUP;
|
| 1751 |
memset(bdi, 0, sizeof(*bdi)); |
| 1752 |
return drv->bdrv_get_info(bs, bdi);
|
| 1753 |
} |
| 1754 |
|
| 1755 |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
| 1756 |
int64_t pos, int size)
|
| 1757 |
{
|
| 1758 |
BlockDriver *drv = bs->drv; |
| 1759 |
if (!drv)
|
| 1760 |
return -ENOMEDIUM;
|
| 1761 |
if (drv->bdrv_save_vmstate)
|
| 1762 |
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
| 1763 |
if (bs->file)
|
| 1764 |
return bdrv_save_vmstate(bs->file, buf, pos, size);
|
| 1765 |
return -ENOTSUP;
|
| 1766 |
} |
| 1767 |
|
| 1768 |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
| 1769 |
int64_t pos, int size)
|
| 1770 |
{
|
| 1771 |
BlockDriver *drv = bs->drv; |
| 1772 |
if (!drv)
|
| 1773 |
return -ENOMEDIUM;
|
| 1774 |
if (drv->bdrv_load_vmstate)
|
| 1775 |
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
| 1776 |
if (bs->file)
|
| 1777 |
return bdrv_load_vmstate(bs->file, buf, pos, size);
|
| 1778 |
return -ENOTSUP;
|
| 1779 |
} |
| 1780 |
|
| 1781 |
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
|
| 1782 |
{
|
| 1783 |
BlockDriver *drv = bs->drv; |
| 1784 |
|
| 1785 |
if (!drv || !drv->bdrv_debug_event) {
|
| 1786 |
return;
|
| 1787 |
} |
| 1788 |
|
| 1789 |
return drv->bdrv_debug_event(bs, event);
|
| 1790 |
|
| 1791 |
} |
| 1792 |
|
| 1793 |
/**************************************************************/
|
| 1794 |
/* handling of snapshots */
|
| 1795 |
|
| 1796 |
int bdrv_can_snapshot(BlockDriverState *bs)
|
| 1797 |
{
|
| 1798 |
BlockDriver *drv = bs->drv; |
| 1799 |
if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
|
| 1800 |
return 0; |
| 1801 |
} |
| 1802 |
|
| 1803 |
if (!drv->bdrv_snapshot_create) {
|
| 1804 |
if (bs->file != NULL) { |
| 1805 |
return bdrv_can_snapshot(bs->file);
|
| 1806 |
} |
| 1807 |
return 0; |
| 1808 |
} |
| 1809 |
|
| 1810 |
return 1; |
| 1811 |
} |
| 1812 |
|
| 1813 |
int bdrv_is_snapshot(BlockDriverState *bs)
|
| 1814 |
{
|
| 1815 |
return !!(bs->open_flags & BDRV_O_SNAPSHOT);
|
| 1816 |
} |
| 1817 |
|
| 1818 |
BlockDriverState *bdrv_snapshots(void)
|
| 1819 |
{
|
| 1820 |
BlockDriverState *bs; |
| 1821 |
|
| 1822 |
if (bs_snapshots) {
|
| 1823 |
return bs_snapshots;
|
| 1824 |
} |
| 1825 |
|
| 1826 |
bs = NULL;
|
| 1827 |
while ((bs = bdrv_next(bs))) {
|
| 1828 |
if (bdrv_can_snapshot(bs)) {
|
| 1829 |
bs_snapshots = bs; |
| 1830 |
return bs;
|
| 1831 |
} |
| 1832 |
} |
| 1833 |
return NULL; |
| 1834 |
} |
| 1835 |
|
| 1836 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
| 1837 |
QEMUSnapshotInfo *sn_info) |
| 1838 |
{
|
| 1839 |
BlockDriver *drv = bs->drv; |
| 1840 |
if (!drv)
|
| 1841 |
return -ENOMEDIUM;
|
| 1842 |
if (drv->bdrv_snapshot_create)
|
| 1843 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
| 1844 |
if (bs->file)
|
| 1845 |
return bdrv_snapshot_create(bs->file, sn_info);
|
| 1846 |
return -ENOTSUP;
|
| 1847 |
} |
| 1848 |
|
| 1849 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
| 1850 |
const char *snapshot_id) |
| 1851 |
{
|
| 1852 |
BlockDriver *drv = bs->drv; |
| 1853 |
int ret, open_ret;
|
| 1854 |
|
| 1855 |
if (!drv)
|
| 1856 |
return -ENOMEDIUM;
|
| 1857 |
if (drv->bdrv_snapshot_goto)
|
| 1858 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
| 1859 |
|
| 1860 |
if (bs->file) {
|
| 1861 |
drv->bdrv_close(bs); |
| 1862 |
ret = bdrv_snapshot_goto(bs->file, snapshot_id); |
| 1863 |
open_ret = drv->bdrv_open(bs, bs->open_flags); |
| 1864 |
if (open_ret < 0) { |
| 1865 |
bdrv_delete(bs->file); |
| 1866 |
bs->drv = NULL;
|
| 1867 |
return open_ret;
|
| 1868 |
} |
| 1869 |
return ret;
|
| 1870 |
} |
| 1871 |
|
| 1872 |
return -ENOTSUP;
|
| 1873 |
} |
| 1874 |
|
| 1875 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
| 1876 |
{
|
| 1877 |
BlockDriver *drv = bs->drv; |
| 1878 |
if (!drv)
|
| 1879 |
return -ENOMEDIUM;
|
| 1880 |
if (drv->bdrv_snapshot_delete)
|
| 1881 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
| 1882 |
if (bs->file)
|
| 1883 |
return bdrv_snapshot_delete(bs->file, snapshot_id);
|
| 1884 |
return -ENOTSUP;
|
| 1885 |
} |
| 1886 |
|
| 1887 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
| 1888 |
QEMUSnapshotInfo **psn_info) |
| 1889 |
{
|
| 1890 |
BlockDriver *drv = bs->drv; |
| 1891 |
if (!drv)
|
| 1892 |
return -ENOMEDIUM;
|
| 1893 |
if (drv->bdrv_snapshot_list)
|
| 1894 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
| 1895 |
if (bs->file)
|
| 1896 |
return bdrv_snapshot_list(bs->file, psn_info);
|
| 1897 |
return -ENOTSUP;
|
| 1898 |
} |
| 1899 |
|
| 1900 |
#define NB_SUFFIXES 4 |
| 1901 |
|
| 1902 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
| 1903 |
{
|
| 1904 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
| 1905 |
int64_t base; |
| 1906 |
int i;
|
| 1907 |
|
| 1908 |
if (size <= 999) { |
| 1909 |
snprintf(buf, buf_size, "%" PRId64, size);
|
| 1910 |
} else {
|
| 1911 |
base = 1024;
|
| 1912 |
for(i = 0; i < NB_SUFFIXES; i++) { |
| 1913 |
if (size < (10 * base)) { |
| 1914 |
snprintf(buf, buf_size, "%0.1f%c",
|
| 1915 |
(double)size / base,
|
| 1916 |
suffixes[i]); |
| 1917 |
break;
|
| 1918 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
| 1919 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
| 1920 |
((size + (base >> 1)) / base),
|
| 1921 |
suffixes[i]); |
| 1922 |
break;
|
| 1923 |
} |
| 1924 |
base = base * 1024;
|
| 1925 |
} |
| 1926 |
} |
| 1927 |
return buf;
|
| 1928 |
} |
| 1929 |
|
| 1930 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
| 1931 |
{
|
| 1932 |
char buf1[128], date_buf[128], clock_buf[128]; |
| 1933 |
#ifdef _WIN32
|
| 1934 |
struct tm *ptm;
|
| 1935 |
#else
|
| 1936 |
struct tm tm;
|
| 1937 |
#endif
|
| 1938 |
time_t ti; |
| 1939 |
int64_t secs; |
| 1940 |
|
| 1941 |
if (!sn) {
|
| 1942 |
snprintf(buf, buf_size, |
| 1943 |
"%-10s%-20s%7s%20s%15s",
|
| 1944 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
| 1945 |
} else {
|
| 1946 |
ti = sn->date_sec; |
| 1947 |
#ifdef _WIN32
|
| 1948 |
ptm = localtime(&ti); |
| 1949 |
strftime(date_buf, sizeof(date_buf),
|
| 1950 |
"%Y-%m-%d %H:%M:%S", ptm);
|
| 1951 |
#else
|
| 1952 |
localtime_r(&ti, &tm); |
| 1953 |
strftime(date_buf, sizeof(date_buf),
|
| 1954 |
"%Y-%m-%d %H:%M:%S", &tm);
|
| 1955 |
#endif
|
| 1956 |
secs = sn->vm_clock_nsec / 1000000000;
|
| 1957 |
snprintf(clock_buf, sizeof(clock_buf),
|
| 1958 |
"%02d:%02d:%02d.%03d",
|
| 1959 |
(int)(secs / 3600), |
| 1960 |
(int)((secs / 60) % 60), |
| 1961 |
(int)(secs % 60), |
| 1962 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
| 1963 |
snprintf(buf, buf_size, |
| 1964 |
"%-10s%-20s%7s%20s%15s",
|
| 1965 |
sn->id_str, sn->name, |
| 1966 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
| 1967 |
date_buf, |
| 1968 |
clock_buf); |
| 1969 |
} |
| 1970 |
return buf;
|
| 1971 |
} |
| 1972 |
|
| 1973 |
|
| 1974 |
/**************************************************************/
|
| 1975 |
/* async I/Os */
|
| 1976 |
|
| 1977 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
| 1978 |
QEMUIOVector *qiov, int nb_sectors,
|
| 1979 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1980 |
{
|
| 1981 |
BlockDriver *drv = bs->drv; |
| 1982 |
BlockDriverAIOCB *ret; |
| 1983 |
|
| 1984 |
if (!drv)
|
| 1985 |
return NULL; |
| 1986 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1987 |
return NULL; |
| 1988 |
|
| 1989 |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
| 1990 |
cb, opaque); |
| 1991 |
|
| 1992 |
if (ret) {
|
| 1993 |
/* Update stats even though technically transfer has not happened. */
|
| 1994 |
bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
| 1995 |
bs->rd_ops ++; |
| 1996 |
} |
| 1997 |
|
| 1998 |
return ret;
|
| 1999 |
} |
| 2000 |
|
| 2001 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
| 2002 |
QEMUIOVector *qiov, int nb_sectors,
|
| 2003 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2004 |
{
|
| 2005 |
BlockDriver *drv = bs->drv; |
| 2006 |
BlockDriverAIOCB *ret; |
| 2007 |
|
| 2008 |
if (!drv)
|
| 2009 |
return NULL; |
| 2010 |
if (bs->read_only)
|
| 2011 |
return NULL; |
| 2012 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 2013 |
return NULL; |
| 2014 |
|
| 2015 |
if (bs->dirty_bitmap) {
|
| 2016 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
| 2017 |
} |
| 2018 |
|
| 2019 |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
| 2020 |
cb, opaque); |
| 2021 |
|
| 2022 |
if (ret) {
|
| 2023 |
/* Update stats even though technically transfer has not happened. */
|
| 2024 |
bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
| 2025 |
bs->wr_ops ++; |
| 2026 |
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
| 2027 |
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
| 2028 |
} |
| 2029 |
} |
| 2030 |
|
| 2031 |
return ret;
|
| 2032 |
} |
| 2033 |
|
| 2034 |
|
| 2035 |
typedef struct MultiwriteCB { |
| 2036 |
int error;
|
| 2037 |
int num_requests;
|
| 2038 |
int num_callbacks;
|
| 2039 |
struct {
|
| 2040 |
BlockDriverCompletionFunc *cb; |
| 2041 |
void *opaque;
|
| 2042 |
QEMUIOVector *free_qiov; |
| 2043 |
void *free_buf;
|
| 2044 |
} callbacks[]; |
| 2045 |
} MultiwriteCB; |
| 2046 |
|
| 2047 |
static void multiwrite_user_cb(MultiwriteCB *mcb) |
| 2048 |
{
|
| 2049 |
int i;
|
| 2050 |
|
| 2051 |
for (i = 0; i < mcb->num_callbacks; i++) { |
| 2052 |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
| 2053 |
if (mcb->callbacks[i].free_qiov) {
|
| 2054 |
qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
| 2055 |
} |
| 2056 |
qemu_free(mcb->callbacks[i].free_qiov); |
| 2057 |
qemu_vfree(mcb->callbacks[i].free_buf); |
| 2058 |
} |
| 2059 |
} |
| 2060 |
|
| 2061 |
static void multiwrite_cb(void *opaque, int ret) |
| 2062 |
{
|
| 2063 |
MultiwriteCB *mcb = opaque; |
| 2064 |
|
| 2065 |
if (ret < 0 && !mcb->error) { |
| 2066 |
mcb->error = ret; |
| 2067 |
} |
| 2068 |
|
| 2069 |
mcb->num_requests--; |
| 2070 |
if (mcb->num_requests == 0) { |
| 2071 |
multiwrite_user_cb(mcb); |
| 2072 |
qemu_free(mcb); |
| 2073 |
} |
| 2074 |
} |
| 2075 |
|
| 2076 |
static int multiwrite_req_compare(const void *a, const void *b) |
| 2077 |
{
|
| 2078 |
const BlockRequest *req1 = a, *req2 = b;
|
| 2079 |
|
| 2080 |
/*
|
| 2081 |
* Note that we can't simply subtract req2->sector from req1->sector
|
| 2082 |
* here as that could overflow the return value.
|
| 2083 |
*/
|
| 2084 |
if (req1->sector > req2->sector) {
|
| 2085 |
return 1; |
| 2086 |
} else if (req1->sector < req2->sector) { |
| 2087 |
return -1; |
| 2088 |
} else {
|
| 2089 |
return 0; |
| 2090 |
} |
| 2091 |
} |
| 2092 |
|
| 2093 |
/*
|
| 2094 |
* Takes a bunch of requests and tries to merge them. Returns the number of
|
| 2095 |
* requests that remain after merging.
|
| 2096 |
*/
|
| 2097 |
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
| 2098 |
int num_reqs, MultiwriteCB *mcb)
|
| 2099 |
{
|
| 2100 |
int i, outidx;
|
| 2101 |
|
| 2102 |
// Sort requests by start sector
|
| 2103 |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
| 2104 |
|
| 2105 |
// Check if adjacent requests touch the same clusters. If so, combine them,
|
| 2106 |
// filling up gaps with zero sectors.
|
| 2107 |
outidx = 0;
|
| 2108 |
for (i = 1; i < num_reqs; i++) { |
| 2109 |
int merge = 0; |
| 2110 |
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
| 2111 |
|
| 2112 |
// This handles the cases that are valid for all block drivers, namely
|
| 2113 |
// exactly sequential writes and overlapping writes.
|
| 2114 |
if (reqs[i].sector <= oldreq_last) {
|
| 2115 |
merge = 1;
|
| 2116 |
} |
| 2117 |
|
| 2118 |
// The block driver may decide that it makes sense to combine requests
|
| 2119 |
// even if there is a gap of some sectors between them. In this case,
|
| 2120 |
// the gap is filled with zeros (therefore only applicable for yet
|
| 2121 |
// unused space in format like qcow2).
|
| 2122 |
if (!merge && bs->drv->bdrv_merge_requests) {
|
| 2123 |
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
| 2124 |
} |
| 2125 |
|
| 2126 |
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
| 2127 |
merge = 0;
|
| 2128 |
} |
| 2129 |
|
| 2130 |
if (merge) {
|
| 2131 |
size_t size; |
| 2132 |
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
| 2133 |
qemu_iovec_init(qiov, |
| 2134 |
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
| 2135 |
|
| 2136 |
// Add the first request to the merged one. If the requests are
|
| 2137 |
// overlapping, drop the last sectors of the first request.
|
| 2138 |
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
| 2139 |
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
| 2140 |
|
| 2141 |
// We might need to add some zeros between the two requests
|
| 2142 |
if (reqs[i].sector > oldreq_last) {
|
| 2143 |
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
| 2144 |
uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
| 2145 |
memset(buf, 0, zero_bytes);
|
| 2146 |
qemu_iovec_add(qiov, buf, zero_bytes); |
| 2147 |
mcb->callbacks[i].free_buf = buf; |
| 2148 |
} |
| 2149 |
|
| 2150 |
// Add the second request
|
| 2151 |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
| 2152 |
|
| 2153 |
reqs[outidx].nb_sectors = qiov->size >> 9;
|
| 2154 |
reqs[outidx].qiov = qiov; |
| 2155 |
|
| 2156 |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
| 2157 |
} else {
|
| 2158 |
outidx++; |
| 2159 |
reqs[outidx].sector = reqs[i].sector; |
| 2160 |
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
| 2161 |
reqs[outidx].qiov = reqs[i].qiov; |
| 2162 |
} |
| 2163 |
} |
| 2164 |
|
| 2165 |
return outidx + 1; |
| 2166 |
} |
| 2167 |
|
| 2168 |
/*
|
| 2169 |
* Submit multiple AIO write requests at once.
|
| 2170 |
*
|
| 2171 |
* On success, the function returns 0 and all requests in the reqs array have
|
| 2172 |
* been submitted. In error case this function returns -1, and any of the
|
| 2173 |
* requests may or may not be submitted yet. In particular, this means that the
|
| 2174 |
* callback will be called for some of the requests, for others it won't. The
|
| 2175 |
* caller must check the error field of the BlockRequest to wait for the right
|
| 2176 |
* callbacks (if error != 0, no callback will be called).
|
| 2177 |
*
|
| 2178 |
* The implementation may modify the contents of the reqs array, e.g. to merge
|
| 2179 |
* requests. However, the fields opaque and error are left unmodified as they
|
| 2180 |
* are used to signal failure for a single request to the caller.
|
| 2181 |
*/
|
| 2182 |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
| 2183 |
{
|
| 2184 |
BlockDriverAIOCB *acb; |
| 2185 |
MultiwriteCB *mcb; |
| 2186 |
int i;
|
| 2187 |
|
| 2188 |
if (num_reqs == 0) { |
| 2189 |
return 0; |
| 2190 |
} |
| 2191 |
|
| 2192 |
// Create MultiwriteCB structure
|
| 2193 |
mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
| 2194 |
mcb->num_requests = 0;
|
| 2195 |
mcb->num_callbacks = num_reqs; |
| 2196 |
|
| 2197 |
for (i = 0; i < num_reqs; i++) { |
| 2198 |
mcb->callbacks[i].cb = reqs[i].cb; |
| 2199 |
mcb->callbacks[i].opaque = reqs[i].opaque; |
| 2200 |
} |
| 2201 |
|
| 2202 |
// Check for mergable requests
|
| 2203 |
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
| 2204 |
|
| 2205 |
/*
|
| 2206 |
* Run the aio requests. As soon as one request can't be submitted
|
| 2207 |
* successfully, fail all requests that are not yet submitted (we must
|
| 2208 |
* return failure for all requests anyway)
|
| 2209 |
*
|
| 2210 |
* num_requests cannot be set to the right value immediately: If
|
| 2211 |
* bdrv_aio_writev fails for some request, num_requests would be too high
|
| 2212 |
* and therefore multiwrite_cb() would never recognize the multiwrite
|
| 2213 |
* request as completed. We also cannot use the loop variable i to set it
|
| 2214 |
* when the first request fails because the callback may already have been
|
| 2215 |
* called for previously submitted requests. Thus, num_requests must be
|
| 2216 |
* incremented for each request that is submitted.
|
| 2217 |
*
|
| 2218 |
* The problem that callbacks may be called early also means that we need
|
| 2219 |
* to take care that num_requests doesn't become 0 before all requests are
|
| 2220 |
* submitted - multiwrite_cb() would consider the multiwrite request
|
| 2221 |
* completed. A dummy request that is "completed" by a manual call to
|
| 2222 |
* multiwrite_cb() takes care of this.
|
| 2223 |
*/
|
| 2224 |
mcb->num_requests = 1;
|
| 2225 |
|
| 2226 |
for (i = 0; i < num_reqs; i++) { |
| 2227 |
mcb->num_requests++; |
| 2228 |
acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
| 2229 |
reqs[i].nb_sectors, multiwrite_cb, mcb); |
| 2230 |
|
| 2231 |
if (acb == NULL) { |
| 2232 |
// We can only fail the whole thing if no request has been
|
| 2233 |
// submitted yet. Otherwise we'll wait for the submitted AIOs to
|
| 2234 |
// complete and report the error in the callback.
|
| 2235 |
if (i == 0) { |
| 2236 |
goto fail;
|
| 2237 |
} else {
|
| 2238 |
multiwrite_cb(mcb, -EIO); |
| 2239 |
break;
|
| 2240 |
} |
| 2241 |
} |
| 2242 |
} |
| 2243 |
|
| 2244 |
/* Complete the dummy request */
|
| 2245 |
multiwrite_cb(mcb, 0);
|
| 2246 |
|
| 2247 |
return 0; |
| 2248 |
|
| 2249 |
fail:
|
| 2250 |
for (i = 0; i < mcb->num_callbacks; i++) { |
| 2251 |
reqs[i].error = -EIO; |
| 2252 |
} |
| 2253 |
qemu_free(mcb); |
| 2254 |
return -1; |
| 2255 |
} |
| 2256 |
|
| 2257 |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
| 2258 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2259 |
{
|
| 2260 |
BlockDriver *drv = bs->drv; |
| 2261 |
|
| 2262 |
if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
| 2263 |
return bdrv_aio_noop_em(bs, cb, opaque);
|
| 2264 |
} |
| 2265 |
|
| 2266 |
if (!drv)
|
| 2267 |
return NULL; |
| 2268 |
return drv->bdrv_aio_flush(bs, cb, opaque);
|
| 2269 |
} |
| 2270 |
|
| 2271 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
| 2272 |
{
|
| 2273 |
acb->pool->cancel(acb); |
| 2274 |
} |
| 2275 |
|
| 2276 |
|
| 2277 |
/**************************************************************/
|
| 2278 |
/* async block device emulation */
|
| 2279 |
|
| 2280 |
typedef struct BlockDriverAIOCBSync { |
| 2281 |
BlockDriverAIOCB common; |
| 2282 |
QEMUBH *bh; |
| 2283 |
int ret;
|
| 2284 |
/* vector translation state */
|
| 2285 |
QEMUIOVector *qiov; |
| 2286 |
uint8_t *bounce; |
| 2287 |
int is_write;
|
| 2288 |
} BlockDriverAIOCBSync; |
| 2289 |
|
| 2290 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
| 2291 |
{
|
| 2292 |
BlockDriverAIOCBSync *acb = |
| 2293 |
container_of(blockacb, BlockDriverAIOCBSync, common); |
| 2294 |
qemu_bh_delete(acb->bh); |
| 2295 |
acb->bh = NULL;
|
| 2296 |
qemu_aio_release(acb); |
| 2297 |
} |
| 2298 |
|
| 2299 |
static AIOPool bdrv_em_aio_pool = {
|
| 2300 |
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
| 2301 |
.cancel = bdrv_aio_cancel_em, |
| 2302 |
}; |
| 2303 |
|
| 2304 |
static void bdrv_aio_bh_cb(void *opaque) |
| 2305 |
{
|
| 2306 |
BlockDriverAIOCBSync *acb = opaque; |
| 2307 |
|
| 2308 |
if (!acb->is_write)
|
| 2309 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
| 2310 |
qemu_vfree(acb->bounce); |
| 2311 |
acb->common.cb(acb->common.opaque, acb->ret); |
| 2312 |
qemu_bh_delete(acb->bh); |
| 2313 |
acb->bh = NULL;
|
| 2314 |
qemu_aio_release(acb); |
| 2315 |
} |
| 2316 |
|
| 2317 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
| 2318 |
int64_t sector_num, |
| 2319 |
QEMUIOVector *qiov, |
| 2320 |
int nb_sectors,
|
| 2321 |
BlockDriverCompletionFunc *cb, |
| 2322 |
void *opaque,
|
| 2323 |
int is_write)
|
| 2324 |
|
| 2325 |
{
|
| 2326 |
BlockDriverAIOCBSync *acb; |
| 2327 |
|
| 2328 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
| 2329 |
acb->is_write = is_write; |
| 2330 |
acb->qiov = qiov; |
| 2331 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
| 2332 |
|
| 2333 |
if (!acb->bh)
|
| 2334 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 2335 |
|
| 2336 |
if (is_write) {
|
| 2337 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
| 2338 |
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
| 2339 |
} else {
|
| 2340 |
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
| 2341 |
} |
| 2342 |
|
| 2343 |
qemu_bh_schedule(acb->bh); |
| 2344 |
|
| 2345 |
return &acb->common;
|
| 2346 |
} |
| 2347 |
|
| 2348 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
| 2349 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 2350 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2351 |
{
|
| 2352 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
| 2353 |
} |
| 2354 |
|
| 2355 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
| 2356 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 2357 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2358 |
{
|
| 2359 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
| 2360 |
} |
| 2361 |
|
| 2362 |
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
| 2363 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2364 |
{
|
| 2365 |
BlockDriverAIOCBSync *acb; |
| 2366 |
|
| 2367 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
| 2368 |
acb->is_write = 1; /* don't bounce in the completion hadler */ |
| 2369 |
acb->qiov = NULL;
|
| 2370 |
acb->bounce = NULL;
|
| 2371 |
acb->ret = 0;
|
| 2372 |
|
| 2373 |
if (!acb->bh)
|
| 2374 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 2375 |
|
| 2376 |
bdrv_flush(bs); |
| 2377 |
qemu_bh_schedule(acb->bh); |
| 2378 |
return &acb->common;
|
| 2379 |
} |
| 2380 |
|
| 2381 |
static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
|
| 2382 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2383 |
{
|
| 2384 |
BlockDriverAIOCBSync *acb; |
| 2385 |
|
| 2386 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
| 2387 |
acb->is_write = 1; /* don't bounce in the completion handler */ |
| 2388 |
acb->qiov = NULL;
|
| 2389 |
acb->bounce = NULL;
|
| 2390 |
acb->ret = 0;
|
| 2391 |
|
| 2392 |
if (!acb->bh) {
|
| 2393 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 2394 |
} |
| 2395 |
|
| 2396 |
qemu_bh_schedule(acb->bh); |
| 2397 |
return &acb->common;
|
| 2398 |
} |
| 2399 |
|
| 2400 |
/**************************************************************/
|
| 2401 |
/* sync block device emulation */
|
| 2402 |
|
| 2403 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
| 2404 |
{
|
| 2405 |
*(int *)opaque = ret;
|
| 2406 |
} |
| 2407 |
|
| 2408 |
#define NOT_DONE 0x7fffffff |
| 2409 |
|
| 2410 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 2411 |
uint8_t *buf, int nb_sectors)
|
| 2412 |
{
|
| 2413 |
int async_ret;
|
| 2414 |
BlockDriverAIOCB *acb; |
| 2415 |
struct iovec iov;
|
| 2416 |
QEMUIOVector qiov; |
| 2417 |
|
| 2418 |
async_context_push(); |
| 2419 |
|
| 2420 |
async_ret = NOT_DONE; |
| 2421 |
iov.iov_base = (void *)buf;
|
| 2422 |
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
| 2423 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
| 2424 |
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
| 2425 |
bdrv_rw_em_cb, &async_ret); |
| 2426 |
if (acb == NULL) { |
| 2427 |
async_ret = -1;
|
| 2428 |
goto fail;
|
| 2429 |
} |
| 2430 |
|
| 2431 |
while (async_ret == NOT_DONE) {
|
| 2432 |
qemu_aio_wait(); |
| 2433 |
} |
| 2434 |
|
| 2435 |
|
| 2436 |
fail:
|
| 2437 |
async_context_pop(); |
| 2438 |
return async_ret;
|
| 2439 |
} |
| 2440 |
|
| 2441 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 2442 |
const uint8_t *buf, int nb_sectors) |
| 2443 |
{
|
| 2444 |
int async_ret;
|
| 2445 |
BlockDriverAIOCB *acb; |
| 2446 |
struct iovec iov;
|
| 2447 |
QEMUIOVector qiov; |
| 2448 |
|
| 2449 |
async_context_push(); |
| 2450 |
|
| 2451 |
async_ret = NOT_DONE; |
| 2452 |
iov.iov_base = (void *)buf;
|
| 2453 |
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
| 2454 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
| 2455 |
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
| 2456 |
bdrv_rw_em_cb, &async_ret); |
| 2457 |
if (acb == NULL) { |
| 2458 |
async_ret = -1;
|
| 2459 |
goto fail;
|
| 2460 |
} |
| 2461 |
while (async_ret == NOT_DONE) {
|
| 2462 |
qemu_aio_wait(); |
| 2463 |
} |
| 2464 |
|
| 2465 |
fail:
|
| 2466 |
async_context_pop(); |
| 2467 |
return async_ret;
|
| 2468 |
} |
| 2469 |
|
| 2470 |
void bdrv_init(void) |
| 2471 |
{
|
| 2472 |
module_call_init(MODULE_INIT_BLOCK); |
| 2473 |
} |
| 2474 |
|
| 2475 |
void bdrv_init_with_whitelist(void) |
| 2476 |
{
|
| 2477 |
use_bdrv_whitelist = 1;
|
| 2478 |
bdrv_init(); |
| 2479 |
} |
| 2480 |
|
| 2481 |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
| 2482 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2483 |
{
|
| 2484 |
BlockDriverAIOCB *acb; |
| 2485 |
|
| 2486 |
if (pool->free_aiocb) {
|
| 2487 |
acb = pool->free_aiocb; |
| 2488 |
pool->free_aiocb = acb->next; |
| 2489 |
} else {
|
| 2490 |
acb = qemu_mallocz(pool->aiocb_size); |
| 2491 |
acb->pool = pool; |
| 2492 |
} |
| 2493 |
acb->bs = bs; |
| 2494 |
acb->cb = cb; |
| 2495 |
acb->opaque = opaque; |
| 2496 |
return acb;
|
| 2497 |
} |
| 2498 |
|
| 2499 |
void qemu_aio_release(void *p) |
| 2500 |
{
|
| 2501 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
| 2502 |
AIOPool *pool = acb->pool; |
| 2503 |
acb->next = pool->free_aiocb; |
| 2504 |
pool->free_aiocb = acb; |
| 2505 |
} |
| 2506 |
|
| 2507 |
/**************************************************************/
|
| 2508 |
/* removable device support */
|
| 2509 |
|
| 2510 |
/**
|
| 2511 |
* Return TRUE if the media is present
|
| 2512 |
*/
|
| 2513 |
int bdrv_is_inserted(BlockDriverState *bs)
|
| 2514 |
{
|
| 2515 |
BlockDriver *drv = bs->drv; |
| 2516 |
int ret;
|
| 2517 |
if (!drv)
|
| 2518 |
return 0; |
| 2519 |
if (!drv->bdrv_is_inserted)
|
| 2520 |
return 1; |
| 2521 |
ret = drv->bdrv_is_inserted(bs); |
| 2522 |
return ret;
|
| 2523 |
} |
| 2524 |
|
| 2525 |
/**
|
| 2526 |
* Return TRUE if the media changed since the last call to this
|
| 2527 |
* function. It is currently only used for floppy disks
|
| 2528 |
*/
|
| 2529 |
int bdrv_media_changed(BlockDriverState *bs)
|
| 2530 |
{
|
| 2531 |
BlockDriver *drv = bs->drv; |
| 2532 |
int ret;
|
| 2533 |
|
| 2534 |
if (!drv || !drv->bdrv_media_changed)
|
| 2535 |
ret = -ENOTSUP; |
| 2536 |
else
|
| 2537 |
ret = drv->bdrv_media_changed(bs); |
| 2538 |
if (ret == -ENOTSUP)
|
| 2539 |
ret = bs->media_changed; |
| 2540 |
bs->media_changed = 0;
|
| 2541 |
return ret;
|
| 2542 |
} |
| 2543 |
|
| 2544 |
/**
|
| 2545 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
| 2546 |
*/
|
| 2547 |
int bdrv_eject(BlockDriverState *bs, int eject_flag) |
| 2548 |
{
|
| 2549 |
BlockDriver *drv = bs->drv; |
| 2550 |
int ret;
|
| 2551 |
|
| 2552 |
if (bs->locked) {
|
| 2553 |
return -EBUSY;
|
| 2554 |
} |
| 2555 |
|
| 2556 |
if (!drv || !drv->bdrv_eject) {
|
| 2557 |
ret = -ENOTSUP; |
| 2558 |
} else {
|
| 2559 |
ret = drv->bdrv_eject(bs, eject_flag); |
| 2560 |
} |
| 2561 |
if (ret == -ENOTSUP) {
|
| 2562 |
if (eject_flag)
|
| 2563 |
bdrv_close(bs); |
| 2564 |
ret = 0;
|
| 2565 |
} |
| 2566 |
|
| 2567 |
return ret;
|
| 2568 |
} |
| 2569 |
|
| 2570 |
int bdrv_is_locked(BlockDriverState *bs)
|
| 2571 |
{
|
| 2572 |
return bs->locked;
|
| 2573 |
} |
| 2574 |
|
| 2575 |
/**
|
| 2576 |
* Lock or unlock the media (if it is locked, the user won't be able
|
| 2577 |
* to eject it manually).
|
| 2578 |
*/
|
| 2579 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
| 2580 |
{
|
| 2581 |
BlockDriver *drv = bs->drv; |
| 2582 |
|
| 2583 |
bs->locked = locked; |
| 2584 |
if (drv && drv->bdrv_set_locked) {
|
| 2585 |
drv->bdrv_set_locked(bs, locked); |
| 2586 |
} |
| 2587 |
} |
| 2588 |
|
| 2589 |
/* needed for generic scsi interface */
|
| 2590 |
|
| 2591 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 2592 |
{
|
| 2593 |
BlockDriver *drv = bs->drv; |
| 2594 |
|
| 2595 |
if (drv && drv->bdrv_ioctl)
|
| 2596 |
return drv->bdrv_ioctl(bs, req, buf);
|
| 2597 |
return -ENOTSUP;
|
| 2598 |
} |
| 2599 |
|
| 2600 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
| 2601 |
unsigned long int req, void *buf, |
| 2602 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2603 |
{
|
| 2604 |
BlockDriver *drv = bs->drv; |
| 2605 |
|
| 2606 |
if (drv && drv->bdrv_aio_ioctl)
|
| 2607 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
| 2608 |
return NULL; |
| 2609 |
} |
| 2610 |
|
| 2611 |
|
| 2612 |
|
| 2613 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
| 2614 |
{
|
| 2615 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
| 2616 |
} |
| 2617 |
|
| 2618 |
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
| 2619 |
{
|
| 2620 |
int64_t bitmap_size; |
| 2621 |
|
| 2622 |
bs->dirty_count = 0;
|
| 2623 |
if (enable) {
|
| 2624 |
if (!bs->dirty_bitmap) {
|
| 2625 |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
| 2626 |
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
| 2627 |
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
| 2628 |
|
| 2629 |
bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
| 2630 |
} |
| 2631 |
} else {
|
| 2632 |
if (bs->dirty_bitmap) {
|
| 2633 |
qemu_free(bs->dirty_bitmap); |
| 2634 |
bs->dirty_bitmap = NULL;
|
| 2635 |
} |
| 2636 |
} |
| 2637 |
} |
| 2638 |
|
| 2639 |
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
| 2640 |
{
|
| 2641 |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
| 2642 |
|
| 2643 |
if (bs->dirty_bitmap &&
|
| 2644 |
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
|
| 2645 |
return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
| 2646 |
(1 << (chunk % (sizeof(unsigned long) * 8))); |
| 2647 |
} else {
|
| 2648 |
return 0; |
| 2649 |
} |
| 2650 |
} |
| 2651 |
|
| 2652 |
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
| 2653 |
int nr_sectors)
|
| 2654 |
{
|
| 2655 |
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
| 2656 |
} |
| 2657 |
|
| 2658 |
int64_t bdrv_get_dirty_count(BlockDriverState *bs) |
| 2659 |
{
|
| 2660 |
return bs->dirty_count;
|
| 2661 |
} |