From: Keith Busch <keith.busch@intel.com>
Date: Mon, 1 Jun 2015 15:29:53 +0000 (-0600)
Subject: blk-mq: Shared tag enhancements
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~149^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f26cdc8536;p=pandora-kernel.git

blk-mq: Shared tag enhancements

Storage controllers may expose multiple block devices that share hardware
resources managed by blk-mq. This patch enhances the shared tags so a
low-level driver can access the shared resources not tied to the unshared
h/w contexts. This way the LLD can dynamically add and delete disks and
request queues without having to track all the request_queue hctx's to
iterate outstanding tags.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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