Am 17.12.2019 um 15:59 hat Kevin Wolf geschrieben: > bdrv_invalidate_cache_all() assumes that all nodes in a given subtree > are either active or inactive when it starts. Therefore, as soon as it > arrives at an already active node, it stops. > > However, this assumption is wrong. For example, it's possible to take a > snapshot of an inactive node, which results in an active overlay over an > inactive backing file. The active overlay is probably also the root node > of an inactive BlockBackend (blk->disable_perm == true). > > In this case, bdrv_invalidate_cache_all() does not need to do anything > to activate the overlay node, but it still needs to recurse into the > children and the parents to make sure that after returning success, > really everything is activated. > > Signed-off-by: Kevin Wolf <kw...@redhat.com>
Actually: Cc: qemu-sta...@nongnu.org
