Revision 7b272452 block.c
| b/block.c | ||
|---|---|---|
| 634 | 634 |
bs->copy_on_read--; |
| 635 | 635 |
} |
| 636 | 636 |
|
| 637 |
static int bdrv_open_flags(BlockDriverState *bs, int flags) |
|
| 638 |
{
|
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| 639 |
int open_flags = flags | BDRV_O_CACHE_WB; |
|
| 640 |
|
|
| 641 |
/* |
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| 642 |
* Clear flags that are internal to the block layer before opening the |
|
| 643 |
* image. |
|
| 644 |
*/ |
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| 645 |
open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
|
| 646 |
|
|
| 647 |
/* |
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| 648 |
* Snapshots should be writable. |
|
| 649 |
*/ |
|
| 650 |
if (bs->is_temporary) {
|
|
| 651 |
open_flags |= BDRV_O_RDWR; |
|
| 652 |
} |
|
| 653 |
|
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| 654 |
return open_flags; |
|
| 655 |
} |
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| 656 |
|
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| 637 | 657 |
/* |
| 638 | 658 |
* Common part for opening disk images and files |
| 639 | 659 |
*/ |
| ... | ... | |
| 665 | 685 |
bs->opaque = g_malloc0(drv->instance_size); |
| 666 | 686 |
|
| 667 | 687 |
bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
| 668 |
open_flags = flags | BDRV_O_CACHE_WB; |
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| 669 |
|
|
| 670 |
/* |
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| 671 |
* Clear flags that are internal to the block layer before opening the |
|
| 672 |
* image. |
|
| 673 |
*/ |
|
| 674 |
open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
|
| 675 |
|
|
| 676 |
/* |
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| 677 |
* Snapshots should be writable. |
|
| 678 |
*/ |
|
| 679 |
if (bs->is_temporary) {
|
|
| 680 |
open_flags |= BDRV_O_RDWR; |
|
| 681 |
} |
|
| 688 |
open_flags = bdrv_open_flags(bs, flags); |
|
| 682 | 689 |
|
| 683 | 690 |
bs->read_only = !(open_flags & BDRV_O_RDWR); |
| 684 | 691 |
|
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