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block: Introduce BdrvChild.opaque

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BlockBackends use it to get a back pointer from BdrvChild to
BlockBackend in any BdrvChildRole callbacks.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-02-24 15:13:35 +01:00
parent 97148076e8
commit 22aa8b246a
2 changed files with 3 additions and 0 deletions
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include/block/block_int.h
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@ -373,6 +373,7 @@ struct BdrvChild {
BlockDriverState *bs;
char *name;
const BdrvChildRole *role;
void *opaque;
QLIST_ENTRY(BdrvChild) next;
QLIST_ENTRY(BdrvChild) next_parent;
};