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

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Message-ID: <ZICpyBl9/Beq46ad@itl-email>
Date:   Wed, 7 Jun 2023 12:01:11 -0400
From:   Demi Marie Obenour <demi@...isiblethingslab.com>
To:     Christoph Hellwig <hch@...radead.org>
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

On Wed, Jun 07, 2023 at 12:46:16AM -0700, Christoph Hellwig wrote:
> > --- 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.

Will fix in v3.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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