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

[Pavel Machek <pavel@ucw.cz>]

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

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