From 26308eab69aa193f7b3fb50764a64ae14544a39b Mon Sep 17 00:00:00 2001 From: Jerome Marchand Date: Fri, 27 Mar 2009 10:31:51 +0100 Subject: block: fix inconsistency in I/O stat accounting code This forces in_flight to be zero when turning off or on the I/O stat accounting and stops updating I/O stats in attempt_merge() when accounting is turned off. Signed-off-by: Jerome Marchand Signed-off-by: Jens Axboe --- block/blk-sysfs.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'block/blk-sysfs.c') diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 3ff9bba3379a..73f36beff5cd 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -209,10 +209,14 @@ static ssize_t queue_iostats_store(struct request_queue *q, const char *page, ssize_t ret = queue_var_store(&stats, page, count); spin_lock_irq(q->queue_lock); + elv_quisce_start(q); + if (stats) queue_flag_set(QUEUE_FLAG_IO_STAT, q); else queue_flag_clear(QUEUE_FLAG_IO_STAT, q); + + elv_quisce_end(q); spin_unlock_irq(q->queue_lock); return ret; -- cgit v1.2.3-58-ga151