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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
blockjob.c
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@ -248,8 +248,10 @@ int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
}
aio_context_acquire(ctx);
}
bdrv_graph_wrlock(bs);
c = bdrv_root_attach_child(bs, name, &child_job, 0, perm, shared_perm, job,
errp);
bdrv_graph_wrunlock();
if (need_context_ops) {
aio_context_release(ctx);
if (job->job.aio_context != qemu_get_aio_context()) {