linux-kernel - Re: [PATCH] brd: enable diskstats

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Date:	Mon, 24 Dec 2012 06:47:40 +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: Re: [PATCH] brd: enable diskstats

Hi,

I'm Ryo Onodera.

This is a resend for my earlier patch. Because I got no reply, I've
added other people as CC, picking from the commit history of the
relevant file.

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. As
mentioned above, I'm also contacting some related people to get more
attention.

This is my first patch to the Linux kernel. Sorry if this is not the
expected way of submitting patches.

Regards

On Mon, 2012-12-24 at 06:41 +0900, Ryo Onodera 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,


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