mg_disk: dequeue and track in-flight request

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mg_disk has at most single request in flight per device.  Till now,
whenever it needs to access the in-flight request it called
elv_next_request().  This patch makes mg_disk track the in-flight
request directly using mg_host->req and dequeue it when processing
starts.

q->queuedata is set to mg_host so that mg_host can be determined
without fetching request from the queue.

[ Impact: dequeue in-flight request, one elv_next_request() per request ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: unsik Kim <donari75@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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Tejun Heo 2009-05-08 11:54:01 +09:00 • committed by Jens Axboe

parent 9a8d23d885

commit 5b36ad6000

1 changed files with 59 additions and 50 deletions

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drivers/block/mg_disk.c

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