linux-kernel - [PATCH] Enable /proc/diskstats for /dev/ramX

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Message-ID: <1353309387.12210.0.camel@erika>
Date:	Mon, 19 Nov 2012 16:16:27 +0900
From:	Ryo Onodera <ryoqun@...il.com>
To:	Nick Piggin <npiggin@...nel.dk>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Enable /proc/diskstats for /dev/ramX

Signed-off-by: Ryo Onodera <ryoqun@...il.com>
---
 drivers/block/brd.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 531ceb3..181b2d7 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -332,6 +332,7 @@ static void brd_make_request(struct request_queue *q, struct bio *bio)
 	sector_t sector;
 	int i;
 	int err = -EIO;
+	int cpu;
 
 	sector = bio->bi_sector;
 	if (sector + (bio->bi_size >> SECTOR_SHIFT) >
@@ -348,6 +349,12 @@ static void brd_make_request(struct request_queue *q, struct bio *bio)
 	if (rw == READA)
 		rw = READ;
 
+	cpu = part_stat_lock();
+	part_stat_inc(cpu, &brd->brd_disk->part0, ios[rw]);
+	part_stat_add(cpu, &brd->brd_disk->part0, sectors[rw],
+					bio_sectors(bio));
+	part_stat_unlock();
+
 	bio_for_each_segment(bvec, bio, i) {
 		unsigned int len = bvec->bv_len;
 		err = brd_do_bvec(brd, bvec->bv_page, len,
-- 
1.7.9.5



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