Re: [PATCH v6 4/5] mm/migrate: skip migrating folios under writeback with AS_WRITEBACK_INDETERMINATE mappings

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On Thu, Dec 19, 2024 at 09:44:42AM -0800, Joanne Koong wrote:
> On Thu, Dec 19, 2024 at 9:37 AM Shakeel Butt <shakeel.butt@xxxxxxxxx> wrote:
[...]
> > >
> > > The request is canceled then - that should clear the page/folio state
> > >
> > >
> > > I start to wonder if we should introduce really short fuse request
> > > timeouts and just repeat requests when things have cleared up. At least
> > > for write-back requests (in the sense that fuse-over-network might
> > > be slow or interrupted for some time).
> > >
> > >
> >
> > Thanks Bernd for the response. Can you tell a bit more about the request
> > timeouts? Basically does it impact/clear the page/folio state as well?
> 
> Request timeouts can be set by admins system-wide to protect against
> malicious/buggy fuse servers that do not reply to requests by a
> certain amount of time. If the request times out, then the whole
> connection will be aborted, and pages/folios will be cleaned up
> accordingly. The corresponding patchset is here [1]. This helps
> mitigate the possibility of unprivileged buggy servers tieing up
> writeback state by not replying.
> 

Thanks a lot Joanne and Bernd.

David, does these timeouts resolve your concerns?




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