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block: Fix AioContext locking in bdrv_insert_node() 

While calling bdrv_new_open_driver_opts(), the main AioContext lock must
be held, not the lock of the AioContext of the block subtree it will be
added to afterwards.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230525124713.401149-11-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 2023-05-25 14:47:11 +02:00
parent 8dc8a60c9e
commit 8823407c06
1 changed files with 11 additions and 0 deletions
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11
block.c
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@ -5399,12 +5399,17 @@ static void bdrv_delete(BlockDriverState *bs)
* empty set of options. The reference to the QDict belongs to the block layer
* after the call (even on failure), so if the caller intends to reuse the
* dictionary, it needs to use qobject_ref() before calling bdrv_open.
*
* The caller holds the AioContext lock for @bs. It must make sure that @bs
* stays in the same AioContext, i.e. @options must not refer to nodes in a
* different AioContext.
*/
BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options,
int flags, Error **errp)
{
ERRP_GUARD();
int ret;
AioContext *ctx = bdrv_get_aio_context(bs);
BlockDriverState *new_node_bs = NULL;
const char *drvname, *node_name;
BlockDriver *drv;
@ -5425,8 +5430,14 @@ BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options,
GLOBAL_STATE_CODE();
aio_context_release(ctx);
aio_context_acquire(qemu_get_aio_context());
new_node_bs = bdrv_new_open_driver_opts(drv, node_name, options, flags,
errp);
aio_context_release(qemu_get_aio_context());
aio_context_acquire(ctx);
assert(bdrv_get_aio_context(bs) == ctx);
options = NULL; /* bdrv_new_open_driver() eats options */
if (!new_node_bs) {
error_prepend(errp, "Could not create node: ");