From: Jan Kara <jack@suse.cz>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>, Song Liu <song@kernel.org>,
Hans de Goede <hdegoede@redhat.com>,
Richard Weinberger <richard@nod.at>,
Minchan Kim <minchan@kernel.org>,
linux-mtd@lists.infradead.org, dm-devel@redhat.com,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
drbd-dev@lists.linbit.com, linux-raid@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
cgroups@vger.kernel.org,
Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: Re: [PATCH 03/12] drbd: remove RB_CONGESTED_REMOTE
Date: Thu, 17 Sep 2020 11:55:07 +0200 [thread overview]
Message-ID: <20200917095507.GJ7347@quack2.suse.cz> (raw)
In-Reply-To: <20200910144833.742260-4-hch@lst.de>
On Thu 10-09-20 16:48:23, Christoph Hellwig wrote:
> This case isn't ever used.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Are you sure it's never used? As far as I'm reading drdb code the contents
of the disk_conf structure seems to be received through netlink (that code
is really a macro hell) and so read_balancing attribute passed to
remote_due_to_read_balancing() can have any value userspace passed to it.
Honza
> ---
> drivers/block/drbd/drbd_req.c | 4 ----
> include/linux/drbd.h | 1 -
> 2 files changed, 5 deletions(-)
>
> diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
> index 5c975af9c15fb8..481bc34fcf386a 100644
> --- a/drivers/block/drbd/drbd_req.c
> +++ b/drivers/block/drbd/drbd_req.c
> @@ -901,13 +901,9 @@ static bool drbd_may_do_local_read(struct drbd_device *device, sector_t sector,
> static bool remote_due_to_read_balancing(struct drbd_device *device, sector_t sector,
> enum drbd_read_balancing rbm)
> {
> - struct backing_dev_info *bdi;
> int stripe_shift;
>
> switch (rbm) {
> - case RB_CONGESTED_REMOTE:
> - bdi = device->ldev->backing_bdev->bd_disk->queue->backing_dev_info;
> - return bdi_read_congested(bdi);
> case RB_LEAST_PENDING:
> return atomic_read(&device->local_cnt) >
> atomic_read(&device->ap_pending_cnt) + atomic_read(&device->rs_pending_cnt);
> diff --git a/include/linux/drbd.h b/include/linux/drbd.h
> index 5755537b51b114..6a8286132751df 100644
> --- a/include/linux/drbd.h
> +++ b/include/linux/drbd.h
> @@ -94,7 +94,6 @@ enum drbd_read_balancing {
> RB_PREFER_REMOTE,
> RB_ROUND_ROBIN,
> RB_LEAST_PENDING,
> - RB_CONGESTED_REMOTE,
> RB_32K_STRIPING,
> RB_64K_STRIPING,
> RB_128K_STRIPING,
> --
> 2.28.0
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2020-09-17 9:55 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-10 14:48 bdi cleanups v4 Christoph Hellwig
[not found] ` <20200910144833.742260-1-hch-jcswGhMUV9g@public.gmane.org>
2020-09-10 14:48 ` [PATCH 01/12] fs: remove the unused SB_I_MULTIROOT flag Christoph Hellwig
2020-09-17 9:41 ` Jan Kara
2020-09-10 14:48 ` [PATCH 02/12] drbd: remove dead code in device_to_statistics Christoph Hellwig
[not found] ` <20200910144833.742260-3-hch-jcswGhMUV9g@public.gmane.org>
2020-09-17 9:46 ` Jan Kara
2020-09-10 14:48 ` [PATCH 03/12] drbd: remove RB_CONGESTED_REMOTE Christoph Hellwig
2020-09-17 9:55 ` Jan Kara [this message]
[not found] ` <20200917095507.GJ7347-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2020-09-19 6:58 ` Christoph Hellwig
2020-09-10 14:48 ` [PATCH 04/12] bdi: initialize ->ra_pages and ->io_pages in bdi_init Christoph Hellwig
[not found] ` <20200910144833.742260-5-hch-jcswGhMUV9g@public.gmane.org>
2020-09-17 10:04 ` Jan Kara
2020-09-19 7:01 ` Christoph Hellwig
2020-09-10 14:48 ` [PATCH 07/12] bdi: remove BDI_CAP_CGROUP_WRITEBACK Christoph Hellwig
[not found] ` <20200910144833.742260-8-hch-jcswGhMUV9g@public.gmane.org>
2020-09-16 9:28 ` David Sterba
2020-09-17 9:36 ` Jan Kara
2020-09-10 14:48 ` [PATCH 09/12] mm: use SWP_SYNCHRONOUS_IO more intelligently Christoph Hellwig
2020-09-17 9:06 ` Jan Kara
2020-09-10 14:48 ` [PATCH 11/12] bdi: invert BDI_CAP_NO_ACCT_WB Christoph Hellwig
[not found] ` <20200910144833.742260-12-hch-jcswGhMUV9g@public.gmane.org>
2020-09-17 9:27 ` Jan Kara
2020-09-10 14:48 ` [PATCH 12/12] bdi: replace BDI_CAP_NO_{WRITEBACK, ACCT_DIRTY} with a single flag Christoph Hellwig
[not found] ` <20200910144833.742260-13-hch-jcswGhMUV9g@public.gmane.org>
2020-09-17 9:31 ` Jan Kara
2020-09-10 14:48 ` [PATCH 05/12] md: update the optimal I/O size on reshape Christoph Hellwig
2020-09-12 6:17 ` Song Liu
2020-09-10 14:48 ` [PATCH 06/12] block: lift setting the readahead size into the block layer Christoph Hellwig
[not found] ` <20200910144833.742260-7-hch-jcswGhMUV9g@public.gmane.org>
2020-09-17 10:35 ` Jan Kara
2020-09-19 7:31 ` Christoph Hellwig
2020-09-10 14:48 ` [PATCH 08/12] bdi: remove BDI_CAP_SYNCHRONOUS_IO Christoph Hellwig
[not found] ` <20200910144833.742260-9-hch-jcswGhMUV9g@public.gmane.org>
2020-09-17 9:36 ` Jan Kara
2020-09-10 14:48 ` [PATCH 10/12] bdi: replace BDI_CAP_STABLE_WRITES with a queue and a sb flag Christoph Hellwig
2020-09-17 9:25 ` Jan Kara
[not found] ` <20200917092524.GC7347-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2020-09-19 6:51 ` Christoph Hellwig
2020-09-15 15:18 bdi cleanups v5 Christoph Hellwig
[not found] ` <20200915151829.1767176-1-hch-jcswGhMUV9g@public.gmane.org>
2020-09-15 15:18 ` [PATCH 03/12] drbd: remove RB_CONGESTED_REMOTE Christoph Hellwig
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