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block: Add bdrv_next_node

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Similar to bdrv_next, this traverses through graph_bdrv_states. Will be
useful to enumerate all the named nodes.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2014-10-31 11:32:54 +08:00 committed by Kevin Wolf
parent 7fb8da2b88
commit 04df765ab4
2 changed files with 9 additions and 0 deletions
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8
block.c
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@ -3801,6 +3801,14 @@ bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base)
return top != NULL;
}
BlockDriverState *bdrv_next_node(BlockDriverState *bs)
{
if (!bs) {
return QTAILQ_FIRST(&graph_bdrv_states);
}
return QTAILQ_NEXT(bs, node_list);
}
BlockDriverState *bdrv_next(BlockDriverState *bs)
{
if (!bs) {

1
include/block/block.h
View File

@ -374,6 +374,7 @@ BlockDriverState *bdrv_lookup_bs(const char *device,
const char *node_name,
Error **errp);
bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base);
BlockDriverState *bdrv_next_node(BlockDriverState *bs);
BlockDriverState *bdrv_next(BlockDriverState *bs);
int bdrv_is_encrypted(BlockDriverState *bs);
int bdrv_key_required(BlockDriverState *bs);