Hi!
> > > > > For reference, this is the diff of this function (with the above
> > > > > patch)
> > > > > against a 2.6.13 (the last one i found around here that had this
> > > > > working, the
> > > > > kernel of suse 10.0, after that it disappeared before 2.6.16):
> > > > >
> > > > > # static int prepare_processes(void)
> > > > > # {
> > > > > # int error;
> > > > > #
> > > > > # pm_prepare_console();
> > > > > # -
> > > > > # - sys_sync();
> > > > > # -
> > > > > # disable_nonboot_cpus();
> > > > > #
> > > > > # if (freeze_processes()) {
> > > >
> > > > Why exacly was sys_sync removed from prepare_processes?
> > >
> > > Because it was moved to freeze_processes().
> > >
> > > > My last power failure during suspend-to-disk caused a journal replay
> > > > which took a few minutes on reboot.
> > >
> > > AFAICT, sys_sync doesn't prevent journal replies from happening on
> > > failure.
> > > It only causes data to be written to the storage, metadata are different
> > > story.
> >
> > Are you sure?
> >
> > sync should sync data and metadata, AFAICT... but it is okay to sync
> > it to the journal, only.
>
> If I understood correctly what the XFS people told us, they sync only as much
> metadata as needed to recover everything in case of a crash, so in fact after
> a crash they need to reply the journal to recover the rest.
Yep, that is what I thought.
That is okay by me.
You loose no data. You may have to replay journal, but that's okay.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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