On Fri, Apr 04, 2025 at 12:24:09PM +0200, Christian Brauner wrote: > If hibernation races with filesystem freezing (e.g. DM reconfiguration), > then hibernation need not freeze a filesystem because it's already > frozen but userspace may thaw the filesystem before hibernation actually > happens. > > If the race happens the other way around, DM reconfiguration may > unexpectedly fail with EBUSY. > > So allow FREEZE_EXCL to nest with other holders. An exclusive freezer > cannot be undone by any of the other concurrent freezers. What is FREEZE_EXCL? I can't find it anywhere including in linux-next.
