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

From: Pavel Machek
Date: Tue Jun 12 2007 - 10:41:41 EST


> >>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?

(cesky, pictures)
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