support > 16 byte CDBs for blocklayer SG_IO

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To: Jens Axboe <axboe@xxxxxxxxx>
Subject: support > 16 byte CDBs for blocklayer SG_IO
From: Christoph Hellwig <hch@xxxxxx>
Date: Sun, 20 Jul 2014 12:23:22 +0200
Cc: linux-scsi@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx

Follow the bsg and sg drivers to support large CDBs by allocation
the larger than 16 byte CDB array if nessecary.

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  - From: Christoph Hellwig
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  - From: Christoph Hellwig

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