Revision 93c65b47 qemu-img.c
| b/qemu-img.c | ||
|---|---|---|
| 493 | 493 |
ret = bdrv_create(drv, out_filename, total_sectors, out_baseimg, flags); |
| 494 | 494 |
if (ret < 0) {
|
| 495 | 495 |
if (ret == -ENOTSUP) {
|
| 496 |
error("Formatting not supported for file format '%s'", fmt);
|
|
| 496 |
error("Formatting not supported for file format '%s'", out_fmt);
|
|
| 497 | 497 |
} else {
|
| 498 | 498 |
error("Error while formatting '%s'", out_filename);
|
| 499 | 499 |
} |
| ... | ... | |
| 592 | 592 |
if (n > bs_offset + bs_sectors - sector_num) |
| 593 | 593 |
n = bs_offset + bs_sectors - sector_num; |
| 594 | 594 |
|
| 595 |
/* If the output image is being created as a copy on write image, |
|
| 596 |
assume that sectors which are unallocated in the input image |
|
| 597 |
are present in both the output's and input's base images (no |
|
| 598 |
need to copy them). */ |
|
| 599 |
if (out_baseimg) {
|
|
| 600 |
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, n, &n1)) {
|
|
| 601 |
sector_num += n1; |
|
| 602 |
continue; |
|
| 603 |
} |
|
| 604 |
/* The next 'n1' sectors are allocated in the input image. Copy |
|
| 605 |
only those as they may be followed by unallocated sectors. */ |
|
| 606 |
n = n1; |
|
| 595 |
if (drv != &bdrv_host_device) {
|
|
| 596 |
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, |
|
| 597 |
n, &n1)) {
|
|
| 598 |
sector_num += n1; |
|
| 599 |
continue; |
|
| 600 |
} |
|
| 601 |
/* The next 'n1' sectors are allocated in the input image. Copy |
|
| 602 |
only those as they may be followed by unallocated sectors. */ |
|
| 603 |
n = n1; |
|
| 604 |
} else {
|
|
| 605 |
n1 = n; |
|
| 607 | 606 |
} |
| 608 | 607 |
|
| 609 | 608 |
if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0) |
| ... | ... | |
| 615 | 614 |
while (n > 0) {
|
| 616 | 615 |
/* If the output image is being created as a copy on write image, |
| 617 | 616 |
copy all sectors even the ones containing only NUL bytes, |
| 618 |
because they may differ from the sectors in the base image. */ |
|
| 619 |
if (out_baseimg || is_allocated_sectors(buf1, n, &n1)) {
|
|
| 617 |
because they may differ from the sectors in the base image. |
|
| 618 |
|
|
| 619 |
If the output is to a host device, we also write out |
|
| 620 |
sectors that are entirely 0, since whatever data was |
|
| 621 |
already there is garbage, not 0s. */ |
|
| 622 |
if (drv == &bdrv_host_device || out_baseimg || |
|
| 623 |
is_allocated_sectors(buf1, n, &n1)) {
|
|
| 620 | 624 |
if (bdrv_write(out_bs, sector_num, buf1, n1) < 0) |
| 621 | 625 |
error("error while writing");
|
| 622 | 626 |
} |
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