linux-kernel - Re: [RFC PATCH 0/5] Shadow directories

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Date:	Thu, 18 Oct 2007 19:10:19 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	jaroslav.sykora@...il.com
cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] Shadow directories


On Oct 18 2007 19:07, Jaroslav Sykora wrote:
>> On Oct 18 2007 17:21, Jaroslav Sykora wrote:
>> >Hello,
>> >
>> >Let's say we have an archive file "hello.zip" with a hello world program source
>> >code. We want to do this:
>> >	cat hello.zip^/hello.c
>> >	gcc hello.zip^/hello.c -o hello
>> >	etc..
>> >
>> >The '^' is an escape character and it tells the computer to treat the file as a directory.
>> 
>> But what you could do is: write a FUSE fs that mirrors the lower content
>> (lofs/fuseloop/however it was named) and expands .zip files as
>> directories are readdir'ed or the zip files stat'ed. That saves us
>> from cluttering up the Linux VFS with such stuff.
>
>Yes, that's exactly what RheaVFS and AVFS do. Except that they both use an escape
>character because:
>1. without it some programs may break [ http://lwn.net/Articles/100148/ ]
>2. it's very useful to pass additional parameters after the escape char to the server.
>
>We can start VFS servers (mentioned above) and chroot the whole user session into
>the mount directory of the server. It works but it's very slow, practically unusable.

Sounds like a program bug, since NTFS-3G is proof of concept that FUSE
can be fast.

>If anybody can think of any other solution of the "redirector
>problem", possibly even non-kernel based one, let me know and I'd be
>glad :-)
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