Revision 83f64091 block-qcow.c
| b/block-qcow.c | ||
|---|---|---|
| 1 | 1 |
/* |
| 2 | 2 |
* Block driver for the QCOW format |
| 3 | 3 |
* |
| 4 |
* Copyright (c) 2004 Fabrice Bellard |
|
| 4 |
* Copyright (c) 2004-2006 Fabrice Bellard
|
|
| 5 | 5 |
* |
| 6 | 6 |
* Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | 7 |
* of this software and associated documentation files (the "Software"), to deal |
| ... | ... | |
| 53 | 53 |
#define L2_CACHE_SIZE 16 |
| 54 | 54 |
|
| 55 | 55 |
typedef struct BDRVQcowState {
|
| 56 |
int fd;
|
|
| 56 |
BlockDriverState *hd;
|
|
| 57 | 57 |
int cluster_bits; |
| 58 | 58 |
int cluster_size; |
| 59 | 59 |
int cluster_sectors; |
| ... | ... | |
| 89 | 89 |
return 0; |
| 90 | 90 |
} |
| 91 | 91 |
|
| 92 |
static int qcow_open(BlockDriverState *bs, const char *filename) |
|
| 92 |
static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
|
|
| 93 | 93 |
{
|
| 94 | 94 |
BDRVQcowState *s = bs->opaque; |
| 95 |
int fd, len, i, shift;
|
|
| 95 |
int len, i, shift, ret;
|
|
| 96 | 96 |
QCowHeader header; |
| 97 |
|
|
| 98 |
fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE); |
|
| 99 |
if (fd < 0) {
|
|
| 100 |
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); |
|
| 101 |
if (fd < 0) |
|
| 102 |
return -1; |
|
| 103 |
} |
|
| 104 |
s->fd = fd; |
|
| 105 |
if (read(fd, &header, sizeof(header)) != sizeof(header)) |
|
| 97 |
|
|
| 98 |
ret = bdrv_file_open(&s->hd, filename, flags); |
|
| 99 |
if (ret < 0) |
|
| 100 |
return ret; |
|
| 101 |
if (bdrv_pread(s->hd, 0, &header, sizeof(header)) != sizeof(header)) |
|
| 106 | 102 |
goto fail; |
| 107 | 103 |
be32_to_cpus(&header.magic); |
| 108 | 104 |
be32_to_cpus(&header.version); |
| ... | ... | |
| 138 | 134 |
s->l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t)); |
| 139 | 135 |
if (!s->l1_table) |
| 140 | 136 |
goto fail; |
| 141 |
lseek(fd, s->l1_table_offset, SEEK_SET); |
|
| 142 |
if (read(fd, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
|
| 137 |
if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
|
| 143 | 138 |
s->l1_size * sizeof(uint64_t)) |
| 144 | 139 |
goto fail; |
| 145 | 140 |
for(i = 0;i < s->l1_size; i++) {
|
| ... | ... | |
| 162 | 157 |
len = header.backing_file_size; |
| 163 | 158 |
if (len > 1023) |
| 164 | 159 |
len = 1023; |
| 165 |
lseek(fd, header.backing_file_offset, SEEK_SET); |
|
| 166 |
if (read(fd, bs->backing_file, len) != len) |
|
| 160 |
if (bdrv_pread(s->hd, header.backing_file_offset, bs->backing_file, len) != len) |
|
| 167 | 161 |
goto fail; |
| 168 | 162 |
bs->backing_file[len] = '\0'; |
| 169 | 163 |
} |
| ... | ... | |
| 174 | 168 |
qemu_free(s->l2_cache); |
| 175 | 169 |
qemu_free(s->cluster_cache); |
| 176 | 170 |
qemu_free(s->cluster_data); |
| 177 |
close(fd);
|
|
| 171 |
bdrv_delete(s->hd);
|
|
| 178 | 172 |
return -1; |
| 179 | 173 |
} |
| 180 | 174 |
|
| ... | ... | |
| 276 | 270 |
if (!allocate) |
| 277 | 271 |
return 0; |
| 278 | 272 |
/* allocate a new l2 entry */ |
| 279 |
l2_offset = lseek(s->fd, 0, SEEK_END);
|
|
| 273 |
l2_offset = bdrv_getlength(s->hd);
|
|
| 280 | 274 |
/* round to cluster size */ |
| 281 | 275 |
l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1); |
| 282 | 276 |
/* update the L1 entry */ |
| 283 | 277 |
s->l1_table[l1_index] = l2_offset; |
| 284 | 278 |
tmp = cpu_to_be64(l2_offset); |
| 285 |
lseek(s->fd, s->l1_table_offset + l1_index * sizeof(tmp), SEEK_SET);
|
|
| 286 |
if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp))
|
|
| 279 |
if (bdrv_pwrite(s->hd, s->l1_table_offset + l1_index * sizeof(tmp),
|
|
| 280 |
&tmp, sizeof(tmp)) != sizeof(tmp))
|
|
| 287 | 281 |
return 0; |
| 288 | 282 |
new_l2_table = 1; |
| 289 | 283 |
} |
| ... | ... | |
| 309 | 303 |
} |
| 310 | 304 |
} |
| 311 | 305 |
l2_table = s->l2_cache + (min_index << s->l2_bits); |
| 312 |
lseek(s->fd, l2_offset, SEEK_SET); |
|
| 313 | 306 |
if (new_l2_table) {
|
| 314 | 307 |
memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); |
| 315 |
if (write(s->fd, l2_table, s->l2_size * sizeof(uint64_t)) !=
|
|
| 308 |
if (bdrv_pwrite(s->hd, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
|
|
| 316 | 309 |
s->l2_size * sizeof(uint64_t)) |
| 317 | 310 |
return 0; |
| 318 | 311 |
} else {
|
| 319 |
if (read(s->fd, l2_table, s->l2_size * sizeof(uint64_t)) !=
|
|
| 312 |
if (bdrv_pread(s->hd, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
|
|
| 320 | 313 |
s->l2_size * sizeof(uint64_t)) |
| 321 | 314 |
return 0; |
| 322 | 315 |
} |
| ... | ... | |
| 337 | 330 |
overwritten */ |
| 338 | 331 |
if (decompress_cluster(s, cluster_offset) < 0) |
| 339 | 332 |
return 0; |
| 340 |
cluster_offset = lseek(s->fd, 0, SEEK_END);
|
|
| 333 |
cluster_offset = bdrv_getlength(s->hd);
|
|
| 341 | 334 |
cluster_offset = (cluster_offset + s->cluster_size - 1) & |
| 342 | 335 |
~(s->cluster_size - 1); |
| 343 | 336 |
/* write the cluster content */ |
| 344 |
lseek(s->fd, cluster_offset, SEEK_SET); |
|
| 345 |
if (write(s->fd, s->cluster_cache, s->cluster_size) != |
|
| 337 |
if (bdrv_pwrite(s->hd, cluster_offset, s->cluster_cache, s->cluster_size) != |
|
| 346 | 338 |
s->cluster_size) |
| 347 | 339 |
return -1; |
| 348 | 340 |
} else {
|
| 349 |
cluster_offset = lseek(s->fd, 0, SEEK_END);
|
|
| 341 |
cluster_offset = bdrv_getlength(s->hd);
|
|
| 350 | 342 |
if (allocate == 1) {
|
| 351 | 343 |
/* round to cluster size */ |
| 352 | 344 |
cluster_offset = (cluster_offset + s->cluster_size - 1) & |
| 353 | 345 |
~(s->cluster_size - 1); |
| 354 |
ftruncate(s->fd, cluster_offset + s->cluster_size);
|
|
| 346 |
bdrv_truncate(s->hd, cluster_offset + s->cluster_size);
|
|
| 355 | 347 |
/* if encrypted, we must initialize the cluster |
| 356 | 348 |
content which won't be written */ |
| 357 | 349 |
if (s->crypt_method && |
| ... | ... | |
| 365 | 357 |
s->cluster_data, |
| 366 | 358 |
s->cluster_data + 512, 1, 1, |
| 367 | 359 |
&s->aes_encrypt_key); |
| 368 |
lseek(s->fd, cluster_offset + i * 512, SEEK_SET);
|
|
| 369 |
if (write(s->fd, s->cluster_data, 512) != 512)
|
|
| 360 |
if (bdrv_pwrite(s->hd, cluster_offset + i * 512,
|
|
| 361 |
s->cluster_data, 512) != 512)
|
|
| 370 | 362 |
return -1; |
| 371 | 363 |
} |
| 372 | 364 |
} |
| ... | ... | |
| 379 | 371 |
/* update L2 table */ |
| 380 | 372 |
tmp = cpu_to_be64(cluster_offset); |
| 381 | 373 |
l2_table[l2_index] = tmp; |
| 382 |
lseek(s->fd, l2_offset + l2_index * sizeof(tmp), SEEK_SET);
|
|
| 383 |
if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp))
|
|
| 374 |
if (bdrv_pwrite(s->hd,
|
|
| 375 |
l2_offset + l2_index * sizeof(tmp), &tmp, sizeof(tmp)) != sizeof(tmp))
|
|
| 384 | 376 |
return 0; |
| 385 | 377 |
} |
| 386 | 378 |
return cluster_offset; |
| ... | ... | |
| 438 | 430 |
if (s->cluster_cache_offset != coffset) {
|
| 439 | 431 |
csize = cluster_offset >> (63 - s->cluster_bits); |
| 440 | 432 |
csize &= (s->cluster_size - 1); |
| 441 |
lseek(s->fd, coffset, SEEK_SET); |
|
| 442 |
ret = read(s->fd, s->cluster_data, csize); |
|
| 433 |
ret = bdrv_pread(s->hd, coffset, s->cluster_data, csize); |
|
| 443 | 434 |
if (ret != csize) |
| 444 | 435 |
return -1; |
| 445 | 436 |
if (decompress_buffer(s->cluster_cache, s->cluster_size, |
| ... | ... | |
| 451 | 442 |
return 0; |
| 452 | 443 |
} |
| 453 | 444 |
|
| 445 |
#if 0 |
|
| 446 |
|
|
| 454 | 447 |
static int qcow_read(BlockDriverState *bs, int64_t sector_num, |
| 455 | 448 |
uint8_t *buf, int nb_sectors) |
| 456 | 449 |
{
|
| ... | ... | |
| 465 | 458 |
if (n > nb_sectors) |
| 466 | 459 |
n = nb_sectors; |
| 467 | 460 |
if (!cluster_offset) {
|
| 468 |
memset(buf, 0, 512 * n); |
|
| 461 |
if (bs->backing_hd) {
|
|
| 462 |
/* read from the base image */ |
|
| 463 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
|
| 464 |
if (ret < 0) |
|
| 465 |
return -1; |
|
| 466 |
} else {
|
|
| 467 |
memset(buf, 0, 512 * n); |
|
| 468 |
} |
|
| 469 | 469 |
} else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
|
| 470 | 470 |
if (decompress_cluster(s, cluster_offset) < 0) |
| 471 | 471 |
return -1; |
| 472 | 472 |
memcpy(buf, s->cluster_cache + index_in_cluster * 512, 512 * n); |
| 473 | 473 |
} else {
|
| 474 |
lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET); |
|
| 475 |
ret = read(s->fd, buf, n * 512); |
|
| 474 |
ret = bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512); |
|
| 476 | 475 |
if (ret != n * 512) |
| 477 | 476 |
return -1; |
| 478 | 477 |
if (s->crypt_method) {
|
| ... | ... | |
| 486 | 485 |
} |
| 487 | 486 |
return 0; |
| 488 | 487 |
} |
| 488 |
#endif |
|
| 489 | 489 |
|
| 490 | 490 |
static int qcow_write(BlockDriverState *bs, int64_t sector_num, |
| 491 | 491 |
const uint8_t *buf, int nb_sectors) |
| ... | ... | |
| 504 | 504 |
index_in_cluster + n); |
| 505 | 505 |
if (!cluster_offset) |
| 506 | 506 |
return -1; |
| 507 |
lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET); |
|
| 508 | 507 |
if (s->crypt_method) {
|
| 509 | 508 |
encrypt_sectors(s, sector_num, s->cluster_data, buf, n, 1, |
| 510 | 509 |
&s->aes_encrypt_key); |
| 511 |
ret = write(s->fd, s->cluster_data, n * 512); |
|
| 510 |
ret = bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, |
|
| 511 |
s->cluster_data, n * 512); |
|
| 512 | 512 |
} else {
|
| 513 |
ret = write(s->fd, buf, n * 512);
|
|
| 513 |
ret = bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512);
|
|
| 514 | 514 |
} |
| 515 | 515 |
if (ret != n * 512) |
| 516 | 516 |
return -1; |
| ... | ... | |
| 522 | 522 |
return 0; |
| 523 | 523 |
} |
| 524 | 524 |
|
| 525 |
typedef struct {
|
|
| 526 |
int64_t sector_num; |
|
| 527 |
uint8_t *buf; |
|
| 528 |
int nb_sectors; |
|
| 529 |
int n; |
|
| 530 |
uint64_t cluster_offset; |
|
| 531 |
uint8_t *cluster_data; |
|
| 532 |
BlockDriverAIOCB *hd_aiocb; |
|
| 533 |
BlockDriverAIOCB *backing_hd_aiocb; |
|
| 534 |
} QCowAIOCB; |
|
| 535 |
|
|
| 536 |
static void qcow_aio_delete(BlockDriverAIOCB *acb); |
|
| 537 |
|
|
| 538 |
static int qcow_aio_new(BlockDriverAIOCB *acb) |
|
| 539 |
{
|
|
| 540 |
BlockDriverState *bs = acb->bs; |
|
| 541 |
BDRVQcowState *s = bs->opaque; |
|
| 542 |
QCowAIOCB *acb1; |
|
| 543 |
acb1 = qemu_mallocz(sizeof(QCowAIOCB)); |
|
| 544 |
if (!acb1) |
|
| 545 |
return -1; |
|
| 546 |
acb->opaque = acb1; |
|
| 547 |
acb1->hd_aiocb = bdrv_aio_new(s->hd); |
|
| 548 |
if (!acb1->hd_aiocb) |
|
| 549 |
goto fail; |
|
| 550 |
if (bs->backing_hd) {
|
|
| 551 |
acb1->backing_hd_aiocb = bdrv_aio_new(bs->backing_hd); |
|
| 552 |
if (!acb1->backing_hd_aiocb) |
|
| 553 |
goto fail; |
|
| 554 |
} |
|
| 555 |
return 0; |
|
| 556 |
fail: |
|
| 557 |
qcow_aio_delete(acb); |
|
| 558 |
return -1; |
|
| 559 |
} |
|
| 560 |
|
|
| 561 |
static void qcow_aio_read_cb(void *opaque, int ret) |
|
| 562 |
{
|
|
| 563 |
BlockDriverAIOCB *acb = opaque; |
|
| 564 |
BlockDriverState *bs = acb->bs; |
|
| 565 |
BDRVQcowState *s = bs->opaque; |
|
| 566 |
QCowAIOCB *acb1 = acb->opaque; |
|
| 567 |
int index_in_cluster; |
|
| 568 |
|
|
| 569 |
if (ret < 0) {
|
|
| 570 |
fail: |
|
| 571 |
acb->cb(acb->cb_opaque, ret); |
|
| 572 |
return; |
|
| 573 |
} |
|
| 574 |
|
|
| 575 |
redo: |
|
| 576 |
/* post process the read buffer */ |
|
| 577 |
if (!acb1->cluster_offset) {
|
|
| 578 |
/* nothing to do */ |
|
| 579 |
} else if (acb1->cluster_offset & QCOW_OFLAG_COMPRESSED) {
|
|
| 580 |
/* nothing to do */ |
|
| 581 |
} else {
|
|
| 582 |
if (s->crypt_method) {
|
|
| 583 |
encrypt_sectors(s, acb1->sector_num, acb1->buf, acb1->buf, |
|
| 584 |
acb1->n, 0, |
|
| 585 |
&s->aes_decrypt_key); |
|
| 586 |
} |
|
| 587 |
} |
|
| 588 |
|
|
| 589 |
acb1->nb_sectors -= acb1->n; |
|
| 590 |
acb1->sector_num += acb1->n; |
|
| 591 |
acb1->buf += acb1->n * 512; |
|
| 592 |
|
|
| 593 |
if (acb1->nb_sectors == 0) {
|
|
| 594 |
/* request completed */ |
|
| 595 |
acb->cb(acb->cb_opaque, 0); |
|
| 596 |
return; |
|
| 597 |
} |
|
| 598 |
|
|
| 599 |
/* prepare next AIO request */ |
|
| 600 |
acb1->cluster_offset = get_cluster_offset(bs, |
|
| 601 |
acb1->sector_num << 9, |
|
| 602 |
0, 0, 0, 0); |
|
| 603 |
index_in_cluster = acb1->sector_num & (s->cluster_sectors - 1); |
|
| 604 |
acb1->n = s->cluster_sectors - index_in_cluster; |
|
| 605 |
if (acb1->n > acb1->nb_sectors) |
|
| 606 |
acb1->n = acb1->nb_sectors; |
|
| 607 |
|
|
| 608 |
if (!acb1->cluster_offset) {
|
|
| 609 |
if (bs->backing_hd) {
|
|
| 610 |
/* read from the base image */ |
|
| 611 |
ret = bdrv_aio_read(acb1->backing_hd_aiocb, acb1->sector_num, |
|
| 612 |
acb1->buf, acb1->n, qcow_aio_read_cb, acb); |
|
| 613 |
if (ret < 0) |
|
| 614 |
goto fail; |
|
| 615 |
} else {
|
|
| 616 |
/* Note: in this case, no need to wait */ |
|
| 617 |
memset(acb1->buf, 0, 512 * acb1->n); |
|
| 618 |
goto redo; |
|
| 619 |
} |
|
| 620 |
} else if (acb1->cluster_offset & QCOW_OFLAG_COMPRESSED) {
|
|
| 621 |
/* add AIO support for compressed blocks ? */ |
|
| 622 |
if (decompress_cluster(s, acb1->cluster_offset) < 0) |
|
| 623 |
goto fail; |
|
| 624 |
memcpy(acb1->buf, |
|
| 625 |
s->cluster_cache + index_in_cluster * 512, 512 * acb1->n); |
|
| 626 |
goto redo; |
|
| 627 |
} else {
|
|
| 628 |
if ((acb1->cluster_offset & 511) != 0) {
|
|
| 629 |
ret = -EIO; |
|
| 630 |
goto fail; |
|
| 631 |
} |
|
| 632 |
ret = bdrv_aio_read(acb1->hd_aiocb, |
|
| 633 |
(acb1->cluster_offset >> 9) + index_in_cluster, |
|
| 634 |
acb1->buf, acb1->n, qcow_aio_read_cb, acb); |
|
| 635 |
if (ret < 0) |
|
| 636 |
goto fail; |
|
| 637 |
} |
|
| 638 |
} |
|
| 639 |
|
|
| 640 |
static int qcow_aio_read(BlockDriverAIOCB *acb, int64_t sector_num, |
|
| 641 |
uint8_t *buf, int nb_sectors) |
|
| 642 |
{
|
|
| 643 |
QCowAIOCB *acb1 = acb->opaque; |
|
| 644 |
|
|
| 645 |
acb1->sector_num = sector_num; |
|
| 646 |
acb1->buf = buf; |
|
| 647 |
acb1->nb_sectors = nb_sectors; |
|
| 648 |
acb1->n = 0; |
|
| 649 |
acb1->cluster_offset = 0; |
|
| 650 |
|
|
| 651 |
qcow_aio_read_cb(acb, 0); |
|
| 652 |
} |
|
| 653 |
|
|
| 654 |
static void qcow_aio_write_cb(void *opaque, int ret) |
|
| 655 |
{
|
|
| 656 |
BlockDriverAIOCB *acb = opaque; |
|
| 657 |
BlockDriverState *bs = acb->bs; |
|
| 658 |
BDRVQcowState *s = bs->opaque; |
|
| 659 |
QCowAIOCB *acb1 = acb->opaque; |
|
| 660 |
int index_in_cluster; |
|
| 661 |
uint64_t cluster_offset; |
|
| 662 |
const uint8_t *src_buf; |
|
| 663 |
|
|
| 664 |
if (ret < 0) {
|
|
| 665 |
fail: |
|
| 666 |
acb->cb(acb->cb_opaque, ret); |
|
| 667 |
return; |
|
| 668 |
} |
|
| 669 |
|
|
| 670 |
acb1->nb_sectors -= acb1->n; |
|
| 671 |
acb1->sector_num += acb1->n; |
|
| 672 |
acb1->buf += acb1->n * 512; |
|
| 673 |
|
|
| 674 |
if (acb1->nb_sectors == 0) {
|
|
| 675 |
/* request completed */ |
|
| 676 |
acb->cb(acb->cb_opaque, 0); |
|
| 677 |
return; |
|
| 678 |
} |
|
| 679 |
|
|
| 680 |
index_in_cluster = acb1->sector_num & (s->cluster_sectors - 1); |
|
| 681 |
acb1->n = s->cluster_sectors - index_in_cluster; |
|
| 682 |
if (acb1->n > acb1->nb_sectors) |
|
| 683 |
acb1->n = acb1->nb_sectors; |
|
| 684 |
cluster_offset = get_cluster_offset(bs, acb1->sector_num << 9, 1, 0, |
|
| 685 |
index_in_cluster, |
|
| 686 |
index_in_cluster + acb1->n); |
|
| 687 |
if (!cluster_offset || (cluster_offset & 511) != 0) {
|
|
| 688 |
ret = -EIO; |
|
| 689 |
goto fail; |
|
| 690 |
} |
|
| 691 |
if (s->crypt_method) {
|
|
| 692 |
if (!acb1->cluster_data) {
|
|
| 693 |
acb1->cluster_data = qemu_mallocz(s->cluster_size); |
|
| 694 |
if (!acb1->cluster_data) {
|
|
| 695 |
ret = -ENOMEM; |
|
| 696 |
goto fail; |
|
| 697 |
} |
|
| 698 |
} |
|
| 699 |
encrypt_sectors(s, acb1->sector_num, acb1->cluster_data, acb1->buf, |
|
| 700 |
acb1->n, 1, &s->aes_encrypt_key); |
|
| 701 |
src_buf = acb1->cluster_data; |
|
| 702 |
} else {
|
|
| 703 |
src_buf = acb1->buf; |
|
| 704 |
} |
|
| 705 |
ret = bdrv_aio_write(acb1->hd_aiocb, |
|
| 706 |
(cluster_offset >> 9) + index_in_cluster, |
|
| 707 |
src_buf, acb1->n, |
|
| 708 |
qcow_aio_write_cb, acb); |
|
| 709 |
if (ret < 0) |
|
| 710 |
goto fail; |
|
| 711 |
} |
|
| 712 |
|
|
| 713 |
static int qcow_aio_write(BlockDriverAIOCB *acb, int64_t sector_num, |
|
| 714 |
const uint8_t *buf, int nb_sectors) |
|
| 715 |
{
|
|
| 716 |
QCowAIOCB *acb1 = acb->opaque; |
|
| 717 |
BlockDriverState *bs = acb->bs; |
|
| 718 |
BDRVQcowState *s = bs->opaque; |
|
| 719 |
|
|
| 720 |
s->cluster_cache_offset = -1; /* disable compressed cache */ |
|
| 721 |
|
|
| 722 |
acb1->sector_num = sector_num; |
|
| 723 |
acb1->buf = (uint8_t *)buf; |
|
| 724 |
acb1->nb_sectors = nb_sectors; |
|
| 725 |
acb1->n = 0; |
|
| 726 |
|
|
| 727 |
qcow_aio_write_cb(acb, 0); |
|
| 728 |
} |
|
| 729 |
|
|
| 730 |
static void qcow_aio_cancel(BlockDriverAIOCB *acb) |
|
| 731 |
{
|
|
| 732 |
QCowAIOCB *acb1 = acb->opaque; |
|
| 733 |
if (acb1->hd_aiocb) |
|
| 734 |
bdrv_aio_cancel(acb1->hd_aiocb); |
|
| 735 |
if (acb1->backing_hd_aiocb) |
|
| 736 |
bdrv_aio_cancel(acb1->backing_hd_aiocb); |
|
| 737 |
} |
|
| 738 |
|
|
| 739 |
static void qcow_aio_delete(BlockDriverAIOCB *acb) |
|
| 740 |
{
|
|
| 741 |
QCowAIOCB *acb1 = acb->opaque; |
|
| 742 |
if (acb1->hd_aiocb) |
|
| 743 |
bdrv_aio_delete(acb1->hd_aiocb); |
|
| 744 |
if (acb1->backing_hd_aiocb) |
|
| 745 |
bdrv_aio_delete(acb1->backing_hd_aiocb); |
|
| 746 |
qemu_free(acb1->cluster_data); |
|
| 747 |
qemu_free(acb1); |
|
| 748 |
} |
|
| 749 |
|
|
| 525 | 750 |
static void qcow_close(BlockDriverState *bs) |
| 526 | 751 |
{
|
| 527 | 752 |
BDRVQcowState *s = bs->opaque; |
| ... | ... | |
| 529 | 754 |
qemu_free(s->l2_cache); |
| 530 | 755 |
qemu_free(s->cluster_cache); |
| 531 | 756 |
qemu_free(s->cluster_data); |
| 532 |
close(s->fd);
|
|
| 757 |
bdrv_delete(s->hd);
|
|
| 533 | 758 |
} |
| 534 | 759 |
|
| 535 | 760 |
static int qcow_create(const char *filename, int64_t total_size, |
| ... | ... | |
| 537 | 762 |
{
|
| 538 | 763 |
int fd, header_size, backing_filename_len, l1_size, i, shift; |
| 539 | 764 |
QCowHeader header; |
| 540 |
char backing_filename[1024]; |
|
| 541 | 765 |
uint64_t tmp; |
| 542 |
struct stat st; |
|
| 543 | 766 |
|
| 544 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
|
| 545 |
0644); |
|
| 767 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); |
|
| 546 | 768 |
if (fd < 0) |
| 547 | 769 |
return -1; |
| 548 | 770 |
memset(&header, 0, sizeof(header)); |
| ... | ... | |
| 552 | 774 |
header_size = sizeof(header); |
| 553 | 775 |
backing_filename_len = 0; |
| 554 | 776 |
if (backing_file) {
|
| 555 |
if (strcmp(backing_file, "fat:")) {
|
|
| 556 |
const char *p; |
|
| 557 |
/* XXX: this is a hack: we do not attempt to check for URL |
|
| 558 |
like syntax */ |
|
| 559 |
p = strchr(backing_file, ':'); |
|
| 560 |
if (p && (p - backing_file) >= 2) {
|
|
| 561 |
/* URL like but exclude "c:" like filenames */ |
|
| 562 |
pstrcpy(backing_filename, sizeof(backing_filename), |
|
| 563 |
backing_file); |
|
| 564 |
} else {
|
|
| 565 |
realpath(backing_file, backing_filename); |
|
| 566 |
if (stat(backing_filename, &st) != 0) {
|
|
| 567 |
return -1; |
|
| 568 |
} |
|
| 569 |
} |
|
| 570 |
header.backing_file_offset = cpu_to_be64(header_size); |
|
| 571 |
backing_filename_len = strlen(backing_filename); |
|
| 572 |
header.backing_file_size = cpu_to_be32(backing_filename_len); |
|
| 573 |
header_size += backing_filename_len; |
|
| 574 |
} else |
|
| 575 |
backing_file = NULL; |
|
| 576 |
header.mtime = cpu_to_be32(st.st_mtime); |
|
| 777 |
header.backing_file_offset = cpu_to_be64(header_size); |
|
| 778 |
backing_filename_len = strlen(backing_file); |
|
| 779 |
header.backing_file_size = cpu_to_be32(backing_filename_len); |
|
| 780 |
header_size += backing_filename_len; |
|
| 781 |
header.mtime = cpu_to_be32(0); |
|
| 577 | 782 |
header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
| 578 | 783 |
unmodifyed sectors */ |
| 579 | 784 |
header.l2_bits = 12; /* 32 KB L2 tables */ |
| ... | ... | |
| 595 | 800 |
/* write all the data */ |
| 596 | 801 |
write(fd, &header, sizeof(header)); |
| 597 | 802 |
if (backing_file) {
|
| 598 |
write(fd, backing_filename, backing_filename_len);
|
|
| 803 |
write(fd, backing_file, backing_filename_len); |
|
| 599 | 804 |
} |
| 600 | 805 |
lseek(fd, header_size, SEEK_SET); |
| 601 | 806 |
tmp = 0; |
| ... | ... | |
| 610 | 815 |
{
|
| 611 | 816 |
BDRVQcowState *s = bs->opaque; |
| 612 | 817 |
uint32_t l1_length = s->l1_size * sizeof(uint64_t); |
| 818 |
int ret; |
|
| 613 | 819 |
|
| 614 | 820 |
memset(s->l1_table, 0, l1_length); |
| 615 |
lseek(s->fd, s->l1_table_offset, SEEK_SET); |
|
| 616 |
if (write(s->fd, s->l1_table, l1_length) < 0) |
|
| 821 |
if (bdrv_pwrite(s->hd, s->l1_table_offset, s->l1_table, l1_length) < 0) |
|
| 617 | 822 |
return -1; |
| 618 |
ftruncate(s->fd, s->l1_table_offset + l1_length); |
|
| 823 |
ret = bdrv_truncate(s->hd, s->l1_table_offset + l1_length); |
|
| 824 |
if (ret < 0) |
|
| 825 |
return ret; |
|
| 619 | 826 |
|
| 620 | 827 |
memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
| 621 | 828 |
memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); |
| ... | ... | |
| 682 | 889 |
cluster_offset = get_cluster_offset(bs, sector_num << 9, 2, |
| 683 | 890 |
out_len, 0, 0); |
| 684 | 891 |
cluster_offset &= s->cluster_offset_mask; |
| 685 |
lseek(s->fd, cluster_offset, SEEK_SET); |
|
| 686 |
if (write(s->fd, out_buf, out_len) != out_len) {
|
|
| 892 |
if (bdrv_pwrite(s->hd, cluster_offset, out_buf, out_len) != out_len) {
|
|
| 687 | 893 |
qemu_free(out_buf); |
| 688 | 894 |
return -1; |
| 689 | 895 |
} |
| ... | ... | |
| 696 | 902 |
static void qcow_flush(BlockDriverState *bs) |
| 697 | 903 |
{
|
| 698 | 904 |
BDRVQcowState *s = bs->opaque; |
| 699 |
fsync(s->fd);
|
|
| 905 |
bdrv_flush(s->hd);
|
|
| 700 | 906 |
} |
| 701 | 907 |
|
| 702 | 908 |
BlockDriver bdrv_qcow = {
|
| ... | ... | |
| 704 | 910 |
sizeof(BDRVQcowState), |
| 705 | 911 |
qcow_probe, |
| 706 | 912 |
qcow_open, |
| 707 |
qcow_read,
|
|
| 708 |
qcow_write,
|
|
| 913 |
NULL,
|
|
| 914 |
NULL,
|
|
| 709 | 915 |
qcow_close, |
| 710 | 916 |
qcow_create, |
| 711 | 917 |
qcow_flush, |
| 712 | 918 |
qcow_is_allocated, |
| 713 | 919 |
qcow_set_key, |
| 714 |
qcow_make_empty |
|
| 920 |
qcow_make_empty, |
|
| 921 |
|
|
| 922 |
.bdrv_aio_new = qcow_aio_new, |
|
| 923 |
.bdrv_aio_read = qcow_aio_read, |
|
| 924 |
.bdrv_aio_write = qcow_aio_write, |
|
| 925 |
.bdrv_aio_cancel = qcow_aio_cancel, |
|
| 926 |
.bdrv_aio_delete = qcow_aio_delete, |
|
| 715 | 927 |
}; |
| 716 | 928 |
|
| 717 | 929 |
|
Also available in: Unified diff