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

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Date:	Fri, 8 Sep 2006 14:00:42 -0700
From:	Greg KH <greg@...ah.com>
To:	Thomas Maier <balagi@...tmail.de>
Cc:	linux-kernel@...r.kernel.org,
	"petero2@...ia.com" <petero2@...ia.com>
Subject: Re: [PATCH] pktcdvd: added sysfs interface + bio write queue handling fix

On Fri, Sep 08, 2006 at 07:55:08PM +0200, Thomas Maier wrote:
> +/sys/block/pktcdvd/<pktdevname>/packet/
> +    statistic         (r)  Show device statistic. One line with
> +                           5 values in following order:
> +                              packets-started
> +                              packets-end
> +                              written in kB
> +                              read gather in kB
> +                              read in kB

Please no.  One value per file is the sysfs rule.

> +    reset_statistic   (w)  Write any value to it to reset
> +                           pktcdvd device statistic values, like
> +                           bytes read/written.
> +
> +    info              (r)  Lots of user readable driver statistics
> +                           and infos. Multiple lines!

Again, no.  Put it in debugfs if you want multiple lines.

> +    write_queue_size  (r)  Contains the size of the bio write
> +                           queue.
> +
> +    write_congestion_off (rw) If bio write queue size is below
> +                              this mark, accept new bio requests
> +                              from the block layer.
> +
> +    write_congestion_on  (rw) If bio write queue size is higher
> +                              as this mark, do no longer accept
> +                              bio write requests from the block
> +                              layer and wait till the pktcdvd
> +                              device has processed enough bio's
> +                              so that bio write queue size is
> +                              below congestion off mark.
> +
> +    mapped_to              Symbolic link to mapped block device
> +                           in the /sys/block tree.

Shouldn't this whole thing be in /sys/class/ instead of /sys/block/ ?

thanks,

greg k-h
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