From owner-freebsd-arch Fri Jun 8 19:30:19 2001 Delivered-To: freebsd-arch@freebsd.org Received: from relay.butya.kz (butya-gw.butya.kz [212.154.129.94]) by hub.freebsd.org (Postfix) with ESMTP id B071537B405; Fri, 8 Jun 2001 19:30:13 -0700 (PDT) (envelope-from bp@butya.kz) Received: by relay.butya.kz (Postfix, from userid 1000) id 6720029020; Sat, 9 Jun 2001 09:29:55 +0700 (ALMST) Received: from localhost (localhost [127.0.0.1]) by relay.butya.kz (Postfix) with ESMTP id 5A91B28FF6; Sat, 9 Jun 2001 09:29:55 +0700 (ALMST) Date: Sat, 9 Jun 2001 09:29:55 +0700 (ALMST) From: Boris Popov To: Alfred Perlstein Cc: Peter Wemm , tlambert2@mindspring.com, "Patrick W. Penzias Dirks" , FreeBSD-FS@FreeBSD.ORG, FreeBSD-Arch@FreeBSD.ORG Subject: Re: Support for pivot_root-like system call? In-Reply-To: <20010608130128.E1832@superconductor.rush.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, 8 Jun 2001, Alfred Perlstein wrote: > The cache coherency bugs are not fixed for all cases, being able to > ask the underlying filesystem for the vm_object does not solve the > problem. > > What if i have a stacking layer where each page alternates > between two files that i'm stacked on top of? This is a case of "fan-out" stacking and such filesystems are much more complex than fan-in ones. VOP_*VOBJECT() were specifically designed for fan-in type of stacking. -- Boris Popov http://www.butya.kz/~bp/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message