Date: Sat, 09 Jun 2001 10:39:24 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Boris Popov <bp@butya.kz> Cc: Alfred Perlstein <bright@rush.net>, Peter Wemm <peter@wemm.org>, "Patrick W. Penzias Dirks" <pwd@apple.com>, FreeBSD-FS@FreeBSD.ORG, FreeBSD-Arch@FreeBSD.ORG Subject: Re: Support for pivot_root-like system call? Message-ID: <3B225F4C.CEE4E28C@mindspring.com> References: <Pine.BSF.4.21.0106090922230.72173-100000@lion.butya.kz>
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Boris Popov wrote: > > 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. Wrong. Read the FICUS papers. Support for a "translucent" FS was one of the intial goals, as was HSM. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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