From: Kevin Corry <kevcorry@us.ibm.com>
Date: Wed, 1 Feb 2006 11:04:52 +0000 (-0800)
Subject: [PATCH] device-mapper statistics: basic
X-Git-Tag: v2.6.16-rc2~151
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12f03a49cf0ab5e8511911142d28699499a572c4;p=linux-2.6

[PATCH] device-mapper statistics: basic

Record basic I/O statistics for mapped devices.

Signed-off-by: Kevin Corry <kevcorry@us.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 8c16359f8b..c47518386c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -573,10 +573,14 @@ static void __split_bio(struct mapped_device *md, struct bio *bio)
 static int dm_request(request_queue_t *q, struct bio *bio)
 {
 	int r;
+	int rw = bio_data_dir(bio);
 	struct mapped_device *md = q->queuedata;
 
 	down_read(&md->io_lock);
 
+	disk_stat_inc(dm_disk(md), ios[rw]);
+	disk_stat_add(dm_disk(md), sectors[rw], bio_sectors(bio));
+
 	/*
 	 * If we're suspended we have to queue
 	 * this io for later.