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of the minor). Establish and use a control mode open. Control mode opens may open the device without locking, but are prohibited from all but some ioctls. MTIOCGET always works. MTIOCERRSTAT works, but the clearing of latched error status is contingent upon whether another application has the device open, in which case an interruptible perip acquire is done. MTSETBSIZ, MTSETDNSTY and MTCOMP also require a periph aquire. Relative fileno and blkno are tracked. Note that just about any error will make these undefined, and if you space to EOD or use hardware block positioning, these are also lost until the next UNLOAD or REWIND. Driver state is also tracked and recorded in the unit softc to be passed back in mt_dsreg for a MTIOCGET call. Thanks to Dan Strick for suggesting this. Reintroduce 2 filemarks at EOD for all but QIC devices. I really think it's wrong, but there is a lot of 3rd party software that depends upon this (not the least of which is tcopy). Introduce a SA_QUIRK_1FM to ensure that some devices can be marked as only being able to do 1 FM at EOD. At samount time force a load to BOT if we aren't mounted. If the LOAD command fails, use the REWIND command (e.g., for the IBM 3590 which for some gawdawful reason doesn't support the LOAD (to BOT) command). Also at samount time, if you don't know fixed or variable, try to *set* to one of the known fixed (or variable, for special case) density codes. We only have to do this once per boot, so it's not that painful. This is another way to try and figure out the wierd QIC devices without having to quirk everything in the universe. A substantial amount of cleanup as to what operations can and what operations cannot be retried. Don't retry space operations if they fail- it'll just lead to lossage. Not yet done is invalidating mounts correctly after errors. ENOTIME.
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