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authorJerome Marchand <jmarchan@redhat.com>2009-03-27 10:31:51 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-04-07 08:12:38 +0200
commit26308eab69aa193f7b3fb50764a64ae14544a39b (patch)
tree758f6100395a23228d042c3a9d6f7dc1922d7530 /block/blk-sysfs.c
parent6c7e8cee6a9128eeb7f83c3ad1cb243f77f5cb16 (diff)
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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 <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-sysfs.c')
-rw-r--r--block/blk-sysfs.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 3ff9bba3379..73f36beff5c 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;