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    SubjectRe: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway
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    On Tuesday, 3 July 2007 22:19, Miklos Szeredi wrote:
    > > > Well, but you did remove sys_sync() from the freezer, which is
    > > > and must be called in the hibernate path.
    > >
    > > That's not really true. We _want_ to call sys_sync() in both the
    > > hibernate and suspend paths (in case the batteries run down), to help
    > > avoid filesystem problems if something goes wrong with the resume. But
    > > it isn't a hard requirement.
    > >
    > > > > I'm not sure why this can't be made atomic, but assuming, that it
    > > > > can't, fuse should still not need to be implicated. If it is, that's
    > > > > an indication about something wrong in the suspend procedure.
    > > >
    > > > Nope, something's wrong in fuse. You must be able to deal with sync
    > > > until every task is frozen.
    > >
    > > That's ridiculous. FUSE itself runs partially as a user task. How can
    > > you expect it to carry out a sync or anything else when it is frozen?
    > >
    > > I suppose you could "deal" with it by having the kernel portion return
    > > an error if the userspace part is frozen. If the hibernate/suspend
    > > code bothered to check the return value, it would immediately abort
    > > the suspend.

    Er, do_sync() doesn't return a result.

    > I strongly believe, that we don't want to deal with it. If we want to
    > call sync(), do it while the system is fully operational. It's a best
    > effort thing anyway, and you can loose data in other ways if resume
    > fails.

    The requirement of syncing when the system (including the user space) is fully
    operational is FUSE-specific. Thus we'd rather like to sync FUSE filesystems
    before freezing the user space and freeze the other filesystems after freezing
    the user space.

    Greetings,
    Rafael


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