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block: Convert bs->backing_hd to BdrvChild

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This is the final step in converting all of the BlockDriverState
pointers that block drivers use to BdrvChild.

After this patch, bs->children contains the full list of child nodes
that are referenced by a given BDS, and these children are only
referenced through BdrvChild, so that updating the pointer in there is
enough for changing edges in the graph.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2015-06-17 14:55:21 +02:00
parent b26e90f56a
commit 760e006384
14 changed files with 115 additions and 109 deletions
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6
block/vvfat.c
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@ -2972,9 +2972,9 @@ static int enable_write_target(BDRVVVFATState *s, Error **errp)
#endif
bdrv_set_backing_hd(s->bs, bdrv_new());
s->bs->backing_hd->drv = &vvfat_write_target;
s->bs->backing_hd->opaque = g_new(void *, 1);
*(void**)s->bs->backing_hd->opaque = s;
s->bs->backing->bs->drv = &vvfat_write_target;
s->bs->backing->bs->opaque = g_new(void *, 1);
*(void**)s->bs->backing->bs->opaque = s;
return 0;