Re: Re: [RFC/PATCH] revoke/frevoke system calls V2

[Pekka J Enberg <penberg@cs.Helsinki.FI>]

Ar Iau, 2006-07-27 am 18:33 +0300, ysgrifennodd Pekka Enberg:
> > Don't device drivers already do that for f_ops->flush (filp_close) and

On Thu, 27 Jul 2006, Alan Cox wrote:
> ->flush is called when each closing occurs.

Yes revoke calls it too, but is that sufficient, or do we need ->revoke?

Ar Iau, 2006-07-27 am 18:33 +0300, ysgrifennodd Pekka Enberg:
> > vm_ops->close (munmap)? What revoke and frevoke do is basically
> > unmap/fsync/close on all the open file descriptors.

On Thu, 27 Jul 2006, Alan Cox wrote:
> What happens if an app is already blocked on a read when you do a
> revoke ? The nasty case answer could be "it completes later on and
> returns the users captured password"

Ouch. You are right. I need to stick that invalidate_inode_pages2 
back in there. The do_fsync call takes care of writes only, obviously. 
Thanks!

				Pekka
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/