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    SubjectRe: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway
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    > > Indeed. Actually, one could argue that it's impossible to solve the
    > > problem as long as we try to call out to userspace during suspend and
    > > need to wait until that's finished, like in the case of sys_sync() and
    > > fuse filesystems, and probably other cases. Maybe we should make *those*
    > > calls return a failure so that the suspend isn't transparent inside the
    > > kernel but is transparent to userspace.
    >
    > Well, it generally needs more consideration. :-)
    >
    > I think that we should introduce mechanisms that will allow us to notify all
    > kernel subsystems, including FUSE and similar, that the system is going to
    > enter a sleep state (one of those is the notifier chain introduced recently).

    Ugh, please no.

    Believe me, fuse is doing _nothing_ out of the ordinary, and should
    not need special treatment during suspend/resume. If suspend itself
    is doing something that triggers fuse activity, then that's a bug,
    such as the sync() thing that started this thread.

    > Then, they may react to such a notification by entering a "suspend" mode
    > of operation in which they will return errors from some callbacks that
    > otherwise should have succeeded etc. That depends on the subsystem in
    > question.

    Sounds horrible.

    Why do we need to deal with subsystem interdependencies during
    suspend? Isn't it about saving device state to ram? That definitely
    _should not_ need to trigger anything that touches filesystems or
    other subsystems.

    Miklos
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