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block: Use BdrvChild to discard

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Other I/O functions are already using a BdrvChild pointer in the API, so
make discard do the same. It makes it possible to initiate the same
permission checks before doing I/O, and much easier to share the
helper functions for this, which will be added and used by write,
truncate and copy range paths.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2018-07-10 14:31:17 +08:00 • committed by Kevin Wolf
parent ecc983a507
commit 0b9fd3f467
11 changed files with 20 additions and 20 deletions
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2
block/mirror.c
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@ -1333,7 +1333,7 @@ static int coroutine_fn bdrv_mirror_top_do_write(BlockDriverState *bs,
break;
case MIRROR_METHOD_DISCARD:
ret = bdrv_co_pdiscard(bs->backing->bs, offset, bytes);
ret = bdrv_co_pdiscard(bs->backing, offset, bytes);
break;
default: