Re: [PATCH] dynamic addition of virtual disks on PPC64 iSeries

[Dave Hansen <haveblue@us.ibm.com>]

On Mon, 2004-05-24 at 00:05, Stephen Rothwell wrote:
> On Sun, 23 May 2004 23:29:20 -0700 Andrew Morton <akpm@osdl.org> wrote:
> > Or to generate a hotplug event when a disk is added?  Even if there's no
> > notification to the kernel, it should be possible to generate the hotplug
> > events in response to a /proc-based trigger.
> 
> I guess that would be possible.  In this case I am trying to do the
> minimum change.

I think this would be a worthy change.  It's the same kind of thing that
we're planning for memory hotplug on ppc64: initiate a probe in /sys
somewhere, and get a few hotplug events in short order.  The only
difference is that we'll probably require a write for the probe to
trigger.  You don't want a 'grep -r foo /sys' to cause probes, do you?

> +       printk(VIOD_KERN_INFO "disk %d: %lu sectors (%lu MB) "
> +                       "CHS=%d/%d/%d sector size %d%s\n",
> +                       dev_no, (unsigned long)(d->size >> 9),
> +                       (unsigned long)(d->size >> 20),
> +                       (int)d->cylinders, (int)d->tracks,
> +                       (int)d->sectors, (int)d->bytes_per_sector,
> +                       d->read_only ? " (RO)" : "");
> +

Isn't it a little naughty to be spitting out so many values in a /sys
file?  

-- Dave