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    SubjectRe: [RFC][PATCH] PM / Sleep: Freeze filesystems during system suspend/hibernation
    On Wed, 1 Feb 2012, Pavel Machek wrote:

    > > particular, this should help to solve a long-standing issue that, in
    > > some cases, during resume from hibernation the boot loader causes the
    > > journal to be replied for the filesystem containing the kernel image
    > > and/or initrd causing it to become inconsistent with the information
    > > stored in the hibernation image.
    >
    > Ungood. Why is bootloader/initrd doing that? If it mounts filesystem
    > read/write, what is the guarantee that it will not change data on the
    > filesystem, breaking stuff?
    >
    > Bootloaders should just not replay journals.
    >
    > > The user-space-driven hibernation (s2disk) is not covered by this
    > > change, because the freezing of filesystems prevents s2disk from
    > > accessing device special files it needs to do its job.
    >
    > ...so bootloaders need to be fixed, anyway.

    I don't know about bootloaders, but from what I've heard, Linux fs
    drivers (including those inside initrds) always replay the journal,
    even if the filesystem is mounted read-only. This could be considered
    a bug in the filesystem code.

    Alan Stern



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