Am 07.12.2009 15:16, schrieb Richard W.M. Jones: > Here's a second go at this patch. The only change is that we add a > second parameter (backinglock=none|shared|exclusive) which can be used > to control locking on the first level (only) of backing disk.
And what about the backing file of the backing file? ;-) This approach feels wrong somehow. We need to infer the locking for backing file from the COW file (none => none; shared/exclusive => shared; commit acquires an exclusive lock temporarily, but still can't prevent corruption with turned off VMs) You probably should add the locking flags to bdrv_open calls in qemu-img, too. Kevin
