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    SubjectRe: file changes without updating mtime
    Perhaps you could create a filesystem wrapper module
    or Linux Security module or equivalent to intercept write/truncate etc.
    to invalidate an extended attribute containing a checksum.

    This extended attribute could be updated from userspace periodically,
    and your userspace program would compare those checksums.

    That would be generally useful. For example rsync could
    use it to very quickly determine if it needed to sync file contents.

    See also http://lkml.org/lkml/2006/5/17/138

    Note also files mounted loopback and modified don't
    have their mtime updated either. Perhaps the patch
    referenced above addresses that?

    Pádraig.
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