> > > In general, writepage is supposed to do work without blocking on
> > > expensive locks that will get pdflush and dirty reclaim stuck in this
> > > fashion. You'll probably have to take the same approach reiserfs does
> > > in data=journal mode, which is leaving the page dirty if fuse_get_req_wp
> > > is going to block without making progress.
> >
> > Pdflush, and dirty reclaim set wbc->nonblocking to true.
> > balance_dirty_pages and fsync don't. The problem here is that
> > Andrew's patch is wrong to let balance_dirty_pages() try to write back
> > pages from a different queue.
>
> async or sync, writepage is supposed to either make progress or bail.
> loopback aside, if the fuse call is blocking long term, you're going to
> run into problems.
Hmm, like what?
Thanks,
Miklos
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