Date: Fri, 21 Nov 2003 10:59:24 -0500 From: Erez Zadok <ezk@cs.sunysb.edu> To: Alex Povolotsky <tarkhil@over.ru> Cc: fs@freebsd.org Subject: Re: "Reverse union" mount possible? Message-ID: <200311211559.hALFxOLr015232@agora.fsl.cs.sunysb.edu> In-Reply-To: Your message of "Fri, 21 Nov 2003 12:45:49 %2B0300." <20031121124549.44895c7c.tarkhil@over.ru>
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In message <20031121124549.44895c7c.tarkhil@over.ru>, Alex Povolotsky writes: > On Thu, 20 Nov 2003 21:01:31 -0500 > Erez Zadok <ezk@cs.sunysb.edu> wrote: > > EZ> > > Right now, I'm readonly mount_null'ing /bin, /sbin, /usr/bin, > EZ> > > /usr/sbin,/usr/lib, /usr/include, /usr/libexec, /usr/share. With > EZ> > > a dozen jails, there are too many mounts to my liking, and about > EZ> > > twice a week I experience panic. Probabily it's nullfs-related. > EZ> > > EZ> > Nullfs is known to be buggy in -stable. In particular, it seems to > EZ> > deadlock under load / when vnodes start getting recycled. > EZ> > EZ> My fist stackable templates were ported to fbsd 4.x and 5.0 not too > EZ> long ago. We ran extensive tests to ensure that the code is stable. > EZ> While it's > EZ> possible we missed stuff, it might help if someone checked what is > EZ> different about my "wrapfs" vs. Nullfs. We may have fixed bugs in > EZ> wrapfs not realizing that they originally came from the base Nullfs > EZ> we started with. > > Sounds cool. Where can I get the source? FiST home page: http://www1.cs.columbia.edu/~ezk/research/fist/ > BTW, I've heard that nullfs/unionfs doesn't allow code sharing. Does wrapfs do it? What do you mean by "code sharing"? Licensing? All of the freebsd fist templates use the BSD license. > Alex. Erez.
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