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[BLOCK] reimplement handling of barrier request

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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>
This commit is contained in:
Tejun Heo
2006-01-06 09:51:03 +01:00
committed by Jens Axboe
parent 52d9e67536
commit 797e7dbbee
4 changed files with 371 additions and 204 deletions
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include/linux/elevator.h
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@@ -130,6 +130,7 @@ extern int elv_try_last_merge(request_queue_t *, struct bio *);
#define ELEVATOR_INSERT_FRONT 1
#define ELEVATOR_INSERT_BACK 2
#define ELEVATOR_INSERT_SORT 3
#define ELEVATOR_INSERT_REQUEUE 4
/*
* return values from elevator_may_queue_fn