Messages in this thread | | | Date | Thu, 07 Jun 2007 17:43:33 -0400 | From | Mark Lord <> | Subject | Re: ext3fs: umount+sync not enough to guarantee metadata-on-disk |
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Chuck Ebbert wrote: > On 06/07/2007 11:41 AM, Andrew Morton wrote: >>> mount /var/lib/mythtv -oremount,ro >>> sync >>> umount /var/lib/mythtv >> 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.
And I kind of expected sync or remount,ro to complete *after* the unlink finishes..
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