tree c0d5974f469dd2d3d4f9b15d87d201b61e248f54
parent 52d9e675361261a1eb1716b02222ec6177ec342b
author Tejun Heo <htejun@gmail.com> 1136537463 +0100
committer Jens Axboe <axboe@suse.de> 1136537463 +0100

[BLOCK] reimplement handling of barrier request

Reimplement handling of barrier requests.

* Flexible handling to deal with various capabilities of
  target devices.
* Retry support for falling back.
* Tagged queues which don't support ordered tag can do ordered.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>