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block: Mark bdrv_root_attach_child() GRAPH_WRLOCK

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Instead of taking the writer lock internally, require callers to already
hold it when calling bdrv_root_attach_child(). These callers will
typically already hold the graph lock once the locking work is
completed, which means that they can't call functions that take it
internally.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20231027155333.420094-5-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-10-27 17:53:13 +02:00
parent f5a3a270fe
commit 03b9eaca54
4 changed files with 12 additions and 10 deletions
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2
block/block-backend.c
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@ -931,10 +931,12 @@ int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp)
ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
GLOBAL_STATE_CODE();
bdrv_ref(bs);
bdrv_graph_wrlock(bs);
blk->root = bdrv_root_attach_child(bs, "root", &child_root,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
blk->perm, blk->shared_perm,
blk, errp);
bdrv_graph_wrunlock();
if (blk->root == NULL) {
return -EPERM;
}