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block: bdrv_has_zero_init

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This fixes the problem that qemu-img's use of no_zero_init only considered the
no_zero_init flag of the format driver, but not of the underlying protocols.

Between the raw/file split and this fix, converting to host devices is broken.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2010-04-14 17:30:35 +02:00
parent 66f82ceed6
commit f2feebbd93
3 changed files with 18 additions and 2 deletions
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13
block.c
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@ -1282,6 +1282,19 @@ void bdrv_flush_all(void)
}
}
int bdrv_has_zero_init(BlockDriverState *bs)
{
assert(bs->drv);
if (bs->drv->no_zero_init) {
return 0;
} else if (bs->file) {
return bdrv_has_zero_init(bs->file);
}
return 1;
}
/*
* Returns true iff the specified sector is present in the disk image. Drivers
* not implementing the functionality are assumed to not support backing files,