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authorTejun Heo <htejun@gmail.com>2005-11-10 08:52:05 +0100
committerJens Axboe <axboe@nelson.home.kernel.dk>2005-11-12 10:56:06 +0100
commit15853af9f07673680439b224519c692f1352b959 (patch)
treee6a8fc1cd34dec568883cd62102e1e626d9241d9 /include/linux/blkdev.h
parent1b5ed5e1f1315e37380e55102f58bcae3344d2a7 (diff)
[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>
Diffstat (limited to 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 025a7f084dbd..a33a31e71bbc 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -406,6 +406,7 @@ struct request_queue
atomic_t refcnt;
+ unsigned int nr_sorted;
unsigned int in_flight;
/*
@@ -631,6 +632,7 @@ static inline void elv_dispatch_add_tail(struct request_queue *q,
{
if (q->last_merge == rq)
q->last_merge = NULL;
+ q->nr_sorted--;
q->end_sector = rq_end_sector(rq);
q->boundary_rq = rq;