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>
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 18c729a..4e1589a 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -734,7 +734,7 @@
/* Discard is optional, ignore the return value */
if (ret >= 0) {
- bdrv_pdiscard(bs->file->bs, d->offset, d->bytes);
+ bdrv_pdiscard(bs->file, d->offset, d->bytes);
}
g_free(d);
