linux-kernel - Re: [patch 5/7] genhd: send async notification on media change

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Date:	Wed, 23 May 2007 09:31:19 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	jeff@...zik.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	htejun@...il.com
Subject: Re: [patch 5/7] genhd: send async notification on media change

On Tue, 22 May 2007 14:12:11 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Wed, 9 May 2007 16:38:35 -0700
> Kristen Carlson Accardi <kristen.c.accardi@...el.com> wrote:
> 
> > Send an uevent to user space to indicate that a media change event has occurred.
> > 
> > Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@...el.com>
> > 
> > Index: 2.6-git/block/genhd.c
> > ===================================================================
> > --- 2.6-git.orig/block/genhd.c
> > +++ 2.6-git/block/genhd.c
> > @@ -643,6 +643,27 @@ struct seq_operations diskstats_op = {
> >  	.show	= diskstats_show
> >  };
> >  
> > +static void media_change_notify_thread(struct work_struct *work)
> > +{
> > +	struct gendisk *gd = container_of(work, struct gendisk, async_notify);
> > +	char event[] = "MEDIA_CHANGE=1";
> > +	char *envp[] = { event, NULL };
> > +
> > +	/*
> > +	 * set enviroment vars to indicate which event this is for
> > +	 * so that user space will know to go check the media status.
> > +	 */
> > +	kobject_uevent_env(&gd->kobj, KOBJ_CHANGE, envp);
> > +	put_device(gd->driverfs_dev);
> > +}
> > +
> > +void genhd_media_change_notify(struct gendisk *disk)
> > +{
> > +	get_device(disk->driverfs_dev);
> > +	schedule_work(&disk->async_notify);
> > +}
> > +EXPORT_SYMBOL_GPL(genhd_media_change_notify);
> > +
> >  struct gendisk *alloc_disk(int minors)
> >  {
> >  	return alloc_disk_node(minors, -1);
> > @@ -672,6 +693,8 @@ struct gendisk *alloc_disk_node(int mino
> >  		kobj_set_kset_s(disk,block_subsys);
> >  		kobject_init(&disk->kobj);
> >  		rand_initialize_disk(disk);
> > +		INIT_WORK(&disk->async_notify,
> > +			media_change_notify_thread);
> >  	}
> >  	return disk;
> 
> Why does this do a schedule_work() rather than calling kobject_uevent_env()
> directly?
> 

Because it is called at Interrupt time.

Kristen
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