Re: [PATCH] add securityfs for all LSMs to use

[Greg KH <greg@kroah.com>]

On Wed, Jul 06, 2005 at 10:12:59PM +0200, Ingo Oeser wrote:
> Hi Greg,
> 
> On Wednesday 06 July 2005 10:17, Greg KH wrote:
> > + * TODO:
> > + *   I think I can get rid of these default_file_ops, but not quite sure...
> > + */
> > +static ssize_t default_read_file(struct file *file, char __user *buf,
> > +				 size_t count, loff_t *ppos)
> > +{
> > +	return 0;
> > +}
> > +
> > +static ssize_t default_write_file(struct file *file, const char __user *buf,
> > +				   size_t count, loff_t *ppos)
> > +{
> > +	return count;
> > +}
> 
> Yes, you can get rid of both, if you move read_null and write_null from 
> drivers/char/mem.c to fs/libfs.c and export them.

That's not really necessary.

> But for what do you need a successful dummy read/write?

I don't.  I need a file_ops structure to give to my newly created dentry
before I assign the one passed in by the caller to it.  That's all.  I
could probably just pass it up the function stack to do it properly,
haven't really looked into it...

thanks,

greg k-h