Re: [PATCH] fs: allow nesting with FREEZE_EXCL

[Christian Brauner]

On Wed, May 07, 2025 at 01:18:34PM +0200, Jan Kara wrote:
> On Fri 04-04-25 12:24:09, 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.
> > 
> > Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
> 
> This has fallen through the cracks in my inbox but the patch now looks good
> to me. Maybe we should fold it into "fs: add owner of freeze/thaw" to not
> have strange intermediate state in the series?

Done.