Hi,
On Thursday, 19 October 2006 10:56, Pavel Machek wrote:
> 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.
--
You never change things by fighting the existing reality.
R. Buckminster Fuller
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