Alexander Motin 4fc0d1d757 Improve length handling when writing sense data.
- Allow maximal sense size limitation via Control Extension mode page.
 - When sense size limited, include descriptors atomically: whole or none.
 - Set new SDAT_OVFL bit if some descriptors don't fit the limit.
 - Report real written sense length instead of static maximal 252 bytes.

MFC after:	2 weeks
2016-12-24 17:42:34 +00:00
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