linux-kernel - Re: [PATCH] block: hide badblocks attribute by default

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Date:   Thu, 27 Apr 2017 23:12:38 +0000
From:   "Verma, Vishal L" <vishal.l.verma@...el.com>
To:     "Williams, Dan J" <dan.j.williams@...el.com>,
        "axboe@...com" <axboe@...com>
CC:     "hch@....de" <hch@....de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
Subject: Re: [PATCH] block: hide badblocks attribute by default

On Thu, 2017-04-27 at 14:46 -0700, Dan Williams wrote:
> Commit 99e6608c9e74 "block: Add badblock management for gendisks"
> allowed for drivers like pmem and software-raid to advertise a list of
> bad media areas. However, it inadvertently added a 'badblocks' to all
> block devices. Lets clean this up by having the 'badblocks' attribute
> not be visible when the driver has not populated a 'struct badblocks'
> instance in the gendisk.
> 
> Cc: Jens Axboe <axboe@...com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Martin K. Petersen <martin.petersen@...cle.com>
> Reported-by: Vishal Verma <vishal.l.verma@...el.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  block/genhd.c |   11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
Tested that this removes the badblocks attribute for block devices that
don't use them:

$ cat /sys/block/pmem6/badblocks 
61576 8

$ cat /sys/block/vda/badblocks 
cat: /sys/block/vda/badblocks: No such file or directory

Tested-by: Vishal Verma <vishal.l.verma@...el.com>