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Subject[PATCH] brd: enable diskstats
From
Date
Signed-off-by: Ryo Onodera <ryoqun@gmail.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@gmail.com> wrote:
> > Signed-off-by: Ryo Onodera <ryoqun@gmail.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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