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[libata] SCSI: improve FORMAT UNIT; minor code cleanups
* SAT specifies that FORMAT UNIT should be translated into a series of READ and WRITE commands that zero the ATA device. That is far too cumbersome to bother with. Since we don't actually format the device, the old behavior of always returning success was inaccurate. Change FORMAT UNIT from returning success immediately (old behavior) to always returning an error (new behavior). * Add some comments around SYNCHRONIZE CACHE * Shuffle scsi command code around a bit, so that things are close to alphabetic order. Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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