linux-kernel - Re: [PATCH] pktcdvd: added sysfs interface + bio write queue handling fix

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Message-Id: <1157927146.26962.13.camel@min.off.vrfy.org>
Date:	Mon, 11 Sep 2006 00:25:46 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	balagi@...tmail.de
Cc:	Greg KH <greg@...ah.com>, Phillip Susi <psusi@....rr.com>,
	linux-kernel@...r.kernel.org,
	"petero2@...ia.com" <petero2@...ia.com>
Subject: Re: [PATCH] pktcdvd: added sysfs interface + bio write queue
	handling fix

On Sun, 2006-09-10 at 21:33 +0200, Thomas Maier wrote:
> Hello,
> 
> > Is this always device specific, or also driver global information? Is
> > pktcdvd always on a block device? Maybe you just want them to be a group
> > of attributes in the block device directory where they belong to, like:
> >   /sys/block/sr0/pktcdvd/info
> >   /sys/block/sr0/pktcdvd/write_queue_size
> >   /sys/block/sr0/pktcdvd/...
> >
> > Does that make sense? We should avoid messing around with symlinks
> > pointing to other devices, if not absolutely needed. We should also not
> > create a new device type, just for adding properties to an existing one,
> > especially if there is not some kind of "device stacking". The
> > "mapped_to" link to the parent device looks like a wild hack to me, we
> > should avoid.
> 
> The pktcdvd driver creates new block devices using a "struct gendisk"
> that creates the /sys/block/pktcdvd[0-7]/ entries (alloc_disk() -> add_disk()).
> 
> Since the files like write_queue_size are per pktcdvd device and belong to
> this device, they should be below the /sys/block/pktcdvd[0-7]/ directory,
> not below the e.g. /sys/block/sr0/ .

So the pktcdvd device have their own device nodes, userspace talks to?

Kay

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