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block: Mark bdrv_apply_auto_read_only() and callers GRAPH_RDLOCK

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This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_apply_auto_read_only() need to hold a reader lock for the graph
because it calls bdrv_can_set_read_only(), which indirectly accesses the
parents list of a node.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230929145157.45443-19-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-09-29 16:51:53 +02:00
parent 277f2007ce
commit 018f9dea9c
10 changed files with 22 additions and 5 deletions
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2
block/rbd.c
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@ -1168,7 +1168,9 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
/* If we are using an rbd snapshot, we must be r/o, otherwise
* leave as-is */
if (s->snap != NULL) {
bdrv_graph_rdlock_main_loop();
r = bdrv_apply_auto_read_only(bs, "rbd snapshots are read-only", errp);
bdrv_graph_rdunlock_main_loop();
if (r < 0) {
goto failed_post_open;
}