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Introduce new libata flags ATA_FLAG_NO_POWEROFF_SPINDOWN and ATA_FLAG_NO_HIBERNATE_SPINDOWN that, if set, will prevent disks from being spun off during system power off and hibernation, respectively (to handle the hibernation case we need the new system state SYSTEM_HIBERNATE_ENTER that can be checked against by libata, in analogy with SYSTEM_POWER_OFF). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>