Date: Fri, 21 Nov 2003 11:57:06 +1100 From: Tim Robbins <tjr@freebsd.org> To: Alex Povolotsky <tarkhil@over.ru> Cc: fs@freebsd.org Subject: Re: "Reverse union" mount possible? Message-ID: <20031121005706.GA67377@wombat.robbins.dropbear.id.au> In-Reply-To: <20031120144143.6cf73e06.tarkhil@over.ru> References: <20031120144143.6cf73e06.tarkhil@over.ru>
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On Thu, Nov 20, 2003 at 02:41:43PM +0300, Alex Povolotsky wrote: > Is it somehow possible, or how complex patch will require to get "reverse union" > mount, with first lookup in underlying system, and file creation there as well? I believe unionfs can do this (mount_unionfs -b option). mount's "union" option only has a small subset of unionfs's features. > Right now, I'm readonly mount_null'ing /bin, /sbin, /usr/bin, /usr/sbin, > /usr/lib, /usr/include, /usr/libexec, /usr/share. With a dozen jails, there > are too many mounts to my liking, and about twice a week I experience panic. > Probabily it's nullfs-related. Nullfs is known to be buggy in -stable. In particular, it seems to deadlock under load / when vnodes start getting recycled. Tim
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