block: Use BdrvChild to discard

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/block/block.h b/include/block/block.h
index a91f37bedf..f85e3a6ed3 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -418,8 +418,8 @@ AioWait *bdrv_get_aio_wait(BlockDriverState *bs);
                    bdrv_get_aio_context(bs_),              \
                    cond); })
 
-int bdrv_pdiscard(BlockDriverState *bs, int64_t offset, int bytes);
-int bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes);
+int bdrv_pdiscard(BdrvChild *child, int64_t offset, int bytes);
+int bdrv_co_pdiscard(BdrvChild *child, int64_t offset, int bytes);
 int bdrv_has_zero_init_1(BlockDriverState *bs);
 int bdrv_has_zero_init(BlockDriverState *bs);
 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);