QUEUE_FLAG_NONROT and merges

[Pierre Ossman <drzeus-list@drzeus.cx>]

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Hi Jeff,

I noticed you've added a new flag to indicate that the drive has no
seek costs and I figured it would be a good idea to use that on the
MMC/SD cards.

Since the name isn't entirely clear in what is implied, I just wanted
to check that there are no plans to assume that there is negligable
request overhead for queues with this flag. I.e. the flag should
indicate that the elevator doesn't have to care about seeks, but it
should still try to merge requests to reduce the transaction overhead.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org

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