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block: Introduce BdrvChild.opaque 

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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2
block/block-backend.c
View File

@ -133,6 +133,7 @@ BlockBackend *blk_new_with_bs(Error **errp)
bs = bdrv_new_root(); bs = bdrv_new_root();
blk->root = bdrv_root_attach_child(bs, "root", &child_root); blk->root = bdrv_root_attach_child(bs, "root", &child_root);
blk->root->opaque = blk;
bs->blk = blk; bs->blk = blk;
return blk; return blk;
} }
@ -458,6 +459,7 @@ void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
assert(!blk->root && !bs->blk); assert(!blk->root && !bs->blk);
bdrv_ref(bs); bdrv_ref(bs);
blk->root = bdrv_root_attach_child(bs, "root", &child_root); blk->root = bdrv_root_attach_child(bs, "root", &child_root);
blk->root->opaque = blk;
bs->blk = blk; bs->blk = blk;
notifier_list_notify(&blk->insert_bs_notifiers, blk); notifier_list_notify(&blk->insert_bs_notifiers, blk);

1
include/block/block_int.h
View File

@ -373,6 +373,7 @@ struct BdrvChild {
BlockDriverState *bs; BlockDriverState *bs;
char *name; char *name;
const BdrvChildRole *role; const BdrvChildRole *role;
void *opaque;
QLIST_ENTRY(BdrvChild) next; QLIST_ENTRY(BdrvChild) next;
QLIST_ENTRY(BdrvChild) next_parent; QLIST_ENTRY(BdrvChild) next_parent;
}; };