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block: Mark bdrv_root_unref_child() GRAPH_WRLOCK

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Instead of taking the writer lock internally, require callers to already
hold it when calling bdrv_root_unref_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>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230911094620.45040-20-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-09-11 11:46:18 +02:00
parent 7f831d29e3
commit ede01e4635
4 changed files with 9 additions and 4 deletions
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3
block/block-backend.c
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@ -915,7 +915,10 @@ void blk_remove_bs(BlockBackend *blk)
blk_drain(blk);
root = blk->root;
blk->root = NULL;
bdrv_graph_wrlock(NULL);
bdrv_root_unref_child(root);
bdrv_graph_wrunlock();
}
/*