linux-kernel - Re: [PATCH 2/2] xen-blkback: Inform userspace that device has been opened

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Message-ID: <ZIA1yLiJyfcJ45vD@infradead.org>
Date:   Wed, 7 Jun 2023 00:46:16 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Demi Marie Obenour <demi@...isiblethingslab.com>
Cc:     Roger Pau Monné <roger.pau@...rix.com>,
        Jens Axboe <axboe@...nel.dk>,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, xen-devel@...ts.xenproject.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] xen-blkback: Inform userspace that device has been
 opened

> --- a/drivers/block/xen-blkback/xenbus.c
> +++ b/drivers/block/xen-blkback/xenbus.c
> @@ -3,6 +3,20 @@
>      Copyright (C) 2005 Rusty Russell <rusty@...tcorp.com.au>
>      Copyright (C) 2005 XenSource Ltd
>  
> +In addition to the Xenstore nodes required by the Xen block device
> +specification, this implementation of blkback uses a new Xenstore
> +node: "opened".  blkback sets "opened" to "0" before the hotplug script
> +is called.  Once the device node has been opened, blkback sets "opened"
> +to "1".

This is a really odd comment style, and a really strange place for it.
To me it feels like this should just be a file in Documentation as it
relates to how to use the driver, and doesn't really explain the code.