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block/get_block_status: set *pnum = 0 on error

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if the call is invoked through bdrv_is_allocated the caller might
expect *pnum = 0 on error. however, a new implementation of
bdrv_get_block_status might only return a negative exit value on
error while keeping *pnum untouched.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Peter Lieven 2013-09-24 15:35:08 +02:00 committed by Kevin Wolf
parent 7454d60045
commit 3e0a233d86
1 changed files with 1 additions and 0 deletions
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block.c
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@ -3162,6 +3162,7 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs,
ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum);
if (ret < 0) {
*pnum = 0;
return ret;
}