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authorJens Axboe <jens.axboe@oracle.com>2009-03-27 10:30:47 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-04-07 08:12:37 +0200
commit6c7e8cee6a9128eeb7f83c3ad1cb243f77f5cb16 (patch)
treef57ac6ab9e57a4e3317a54d04c39151d3bb942cf /block/blk.h
parentd508afb437daee7cf07da085b635c44a4ebf9b38 (diff)
block: elevator quiescing helpers
Simple helper functions to quiesce the request queue. These are currently only used for switching IO schedulers on-the-fly, but we can use them to properly switch IO accounting on and off as well. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk.h')
-rw-r--r--block/blk.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk.h b/block/blk.h
index 3ee94358b43..22043c2886c 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -70,6 +70,10 @@ void blk_queue_congestion_threshold(struct request_queue *q);
int blk_dev_init(void);
+void elv_quisce_start(struct request_queue *q);
+void elv_quisce_end(struct request_queue *q);
+
+
/*
* Return the threshold (number of used requests) at which the queue is
* considered to be congested. It include a little hysteresis to keep the