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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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2
blockjob.c
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@ -198,6 +198,7 @@ void block_job_remove_all_bdrv(BlockJob *job)
* one to make sure that such a concurrent access does not attempt
* to process an already freed BdrvChild.
*/
bdrv_graph_wrlock(NULL);
while (job->nodes) {
GSList *l = job->nodes;
BdrvChild *c = l->data;
@ -209,6 +210,7 @@ void block_job_remove_all_bdrv(BlockJob *job)
g_slist_free_1(l);
}
bdrv_graph_wrunlock();
}
bool block_job_has_bdrv(BlockJob *job, BlockDriverState *bs)