linux-kernel - Re: [PATCH v3 3/3] blk-crypto: show crypto capabilities in sysfs

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Date:   Mon, 13 Dec 2021 21:04:29 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Eric Biggers <ebiggers@...nel.org>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-mmc@...r.kernel.org,
        Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH v3 3/3] blk-crypto: show crypto capabilities in sysfs

On 12/11/21 02:50, Greg Kroah-Hartman wrote:
> On Fri, Dec 10, 2021 at 09:29:41AM -0800, Bart Van Assche wrote:
>> (b) No other block layer sysfs attribute follows this encoding scheme.
> 
> Then follow what they do.  Do they have multiple values in a single
> file?  If so, they are broken and we should change that.

Hi Greg,

The only other block layer sysfs attribute I know of that reports 
multiple values is the queue/scheduler attribute. Here is an example of 
the output that can be produced by reading that attribute:

# cat /sys/block/sda/queue/scheduler
[mq-deadline] kyber bfq none

I don't think that changing the behavior of that attribute is an option 
because that would break existing user space software, e.g. the 
https://github.com/osandov/blktests/ test suite.

Thanks,

Bart.