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blk-mq: split out tag initialization, support shared tags

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Add a new blk_mq_tag_set structure that gets set up before we initialize
the queue.  A single blk_mq_tag_set structure can be shared by multiple
queues.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Modular export of blk_mq_{alloc,free}_tagset added by me.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-04-15 14:14:00 -06:00 • committed by Jens Axboe
commit 24d2f90309
8 changed files with 262 additions and 200 deletions
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