Revision 466ad822 block.c
| b/block.c | ||
|---|---|---|
| 489 | 489 |
|
| 490 | 490 |
memset(&bs->bl, 0, sizeof(bs->bl)); |
| 491 | 491 |
|
| 492 |
if (drv && drv->bdrv_refresh_limits) {
|
|
| 492 |
if (!drv) {
|
|
| 493 |
return 0; |
|
| 494 |
} |
|
| 495 |
|
|
| 496 |
/* Take some limits from the children as a default */ |
|
| 497 |
if (bs->file) {
|
|
| 498 |
bdrv_refresh_limits(bs->file); |
|
| 499 |
bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; |
|
| 500 |
} |
|
| 501 |
|
|
| 502 |
if (bs->backing_hd) {
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|
| 503 |
bdrv_refresh_limits(bs->backing_hd); |
|
| 504 |
bs->bl.opt_transfer_length = |
|
| 505 |
MAX(bs->bl.opt_transfer_length, |
|
| 506 |
bs->backing_hd->bl.opt_transfer_length); |
|
| 507 |
} |
|
| 508 |
|
|
| 509 |
/* Then let the driver override it */ |
|
| 510 |
if (drv->bdrv_refresh_limits) {
|
|
| 493 | 511 |
return drv->bdrv_refresh_limits(bs); |
| 494 | 512 |
} |
| 495 | 513 |
|
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