Re: ext3fs: umount+sync not enough to guarantee metadata-on-disk

Pavel Machek
2007-06-12T14:41:37Z

Hi!

> >>Did this succeed? If the application is still
> >>truncating that file, the
> >>umount should have failed.
> >
> >Shouldn't sync should wait for truncate to finish?
>
> The part that gets me here, and that others might be
> missing,
> is that we are not waiting for ftruncate at this point.
>
> We're waiting for unlink. The application that was
> doing ftruncate
> in tiny little doses has been sent a kill-9 signal, so
> what should
> be happening now (confirmed by disk activity LEDs) is
> the file should
> just be getting deleted the same as if we did "rm
> bigfile" on it.

Well, AFAICT kill-9 signal delivery can take time. It still might be
doing ftruncate.

It would be interesting to know when in that sequence mythtv dies...
or perhaps put loop 'while killall -9 mythtv returns success, sleep 1'
into shutdown scripts?
Pavel

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html