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From: Damien Le Moal <Damien.LeMoal@wdc.com>
To: Coly Li <colyli@suse.de>,
	"linux-bcache@vger.kernel.org" <linux-bcache@vger.kernel.org>
Cc: "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	Hannes Reinecke <hare@suse.com>,
	Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
Subject: Re: [RFC PATCH v4 3/3] bcache: reject writeback cache mode for zoned backing device
Date: Mon, 25 May 2020 01:26:34 +0000
Message-ID: <CY4PR04MB3751EF222D4DFFB9C05AB38EE7B30@CY4PR04MB3751.namprd04.prod.outlook.com> (raw)
In-Reply-To: <20200522121837.109651-4-colyli@suse.de>

On 2020/05/22 21:19, Coly Li wrote:
> Currently we don't support writeback mode for zoned device as backing
> device. So reject it by sysfs interface.
> 
> This rejection will be removed after the writeback cache mode support
> for zoned device gets done.
> 
> Signed-off-by: Coly Li <colyli@suse.de>
> Cc: Damien Le Moal <damien.lemoal@wdc.com>
> Cc: Hannes Reinecke <hare@suse.com>
> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> ---
>  drivers/md/bcache/sysfs.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
> index 323276994aab..41bdbc42a17d 100644
> --- a/drivers/md/bcache/sysfs.c
> +++ b/drivers/md/bcache/sysfs.c
> @@ -359,6 +359,11 @@ STORE(__cached_dev)
>  		if (v < 0)
>  			return v;
>  
> +		if ((unsigned int) v == CACHE_MODE_WRITEBACK) {
> +			pr_err("writeback mode is not supported for zoned backing device.\n");
> +			return -ENOTSUPP;
> +		}
> +
>  		if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) {
>  			SET_BDEV_CACHE_MODE(&dc->sb, v);
>  			bch_write_bdev_super(dc, NULL);
> 

Do you have a similar check in bcache user tools at format time ? Or is the
cache mode specified only when the bcache device is started ?

Looks good.

Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>

-- 
Damien Le Moal
Western Digital Research

  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-22 12:18 [RFC PATCH v4 0/3] bcache: support zoned device as bcache " Coly Li
2020-05-22 12:18 ` [RFC PATCH v4 1/3] bcache: export bcache zone information for zoned " Coly Li
2020-05-25  1:10   ` Damien Le Moal
2020-06-01 12:34     ` Coly Li
2020-06-02  8:48       ` Damien Le Moal
2020-06-02 12:50         ` Coly Li
2020-06-03  0:58           ` Damien Le Moal
2020-05-22 12:18 ` [RFC PATCH v4 2/3] bcache: handle zone management bios for bcache device Coly Li
2020-05-25  1:24   ` Damien Le Moal
2020-06-01 16:06     ` Coly Li
2020-06-02  8:54       ` Damien Le Moal
2020-06-02 10:18         ` Coly Li
2020-06-03  0:51           ` Damien Le Moal
2020-05-22 12:18 ` [RFC PATCH v4 3/3] bcache: reject writeback cache mode for zoned backing device Coly Li
2020-05-25  1:26   ` Damien Le Moal [this message]
2020-06-01 16:09     ` Coly Li
2020-05-25  5:25 ` [RFC PATCH v4 0/3] bcache: support zoned device as bcache " Damien Le Moal
2020-05-25  8:14   ` Coly Li

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