From: Tejun Heo <htejun@gmail.com>
Date: Thu, 10 Nov 2005 07:52:05 +0000 (+0100)
Subject: [BLOCK] Implement elv_drain_elevator for improved switch error detection
X-Git-Tag: v2.6.15-rc2~227
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15853af9f07673680439b224519c692f1352b959;p=pandora-kernel.git

[BLOCK] Implement elv_drain_elevator for improved switch error detection

This patch adds request_queue->nr_sorted which keeps the number of
requests in the iosched and implement elv_drain_elevator which
performs forced dispatching.  elv_drain_elevator checks whether
iosched actually dispatches all requests it has and prints error
message if it doesn't.  As buggy forced dispatching can result in
wrong barrier operations, I think this extra check is worthwhile.

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