block: change the tag sync vs async restriction logic
authorJens Axboe <jens.axboe@oracle.com>
Wed, 20 May 2009 06:54:31 +0000 (08:54 +0200)
committerJens Axboe <jens.axboe@oracle.com>
Wed, 20 May 2009 06:54:31 +0000 (08:54 +0200)
Make them fully share the tag space, but disallow async requests using
the last any two slots.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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