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    SubjectRe: ext3fs: umount+sync not enough to guarantee metadata-on-disk
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    Hi,

    On Thu, 2007-06-07 at 12:01 -0400, Mark Lord 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.
    >
    > Actually, what I expect to happen is for the remount,ro
    > to block until the file deletion completes. But it doesn't.

    No -- all that the remount,ro sees is that there's a fd still open for
    write. It has no idea if or when that fd is going to get closed, so it
    should fail. Returning -EBUSY is the only thing it _can_ do: waiting
    for the fs to be remountable might wait forever.

    So the fs is still writable after that point.

    --Stephen


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