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Date:	Mon, 24 Dec 2012 06:41:08 +0900
From:	Ryo Onodera <ryoqun@...il.com>
To:	Nick Piggin <npiggin@...nel.dk>
Cc:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...il.com>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: [PATCH] brd: enable diskstats

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

On Mon, 2012-11-19 at 16:26 +0900, Ryo Onodera wrote:
> Hi,
> 
> I'm Ryo Onodera. I created this very tiny patch to enable /proc/diskstats for
> /dev/ramX.
> 
> I'm contacting Nick Piggin as the maintainer of ramdisk ram block.
> 
> This is my first patch to the Linux kernel. Sorry if this is not the expected
> way of submitting patches.
> 
> Regards
> 
> Ryo Onodera
> 
> On Mon, Nov 19, 2012 at 4:16 PM, Ryo Onodera <ryoqun@...il.com> wrote:
> > 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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