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Re: How to link against diskfs

From: Sergiu Ivanov
Subject: Re: How to link against diskfs
Date: Thu, 15 May 2008 10:29:43 +0300

On Thu, May 15, 2008 at 2:58 AM, <olafBuddenhagen@gmx.net> wrote:
> Why would that be the wrong library? isofs uses diskfs, and isofs does
> a similar thing: takes a file and shows it in another way, as a
> directory tree. Isn't the filtering translator supposed to do the same
> thing: take the underlying directory and show it filtered?

What isofs does is offering access to the filesystem structures (inodes
etc.) contained within a store. Thus it uses libdiskfs -- a library for
"real" filesystems that directly store the filesystem data in the
underlying store. (Usually a disk partition. It can also be a normal
file, but it will still be treated like a "real" store -- just like
loopback devices on other systems, only less awkward...)

Does it mean that the store should be a single file (special file)? I thought that the store could be a directory, too.
So, if I were implementing a tar file translator, I should have used libdiskfs, do I get it right?
> Unfourtunately, I cannot even suppose what another way to write such a
> translator could be :-(

For virtual filesystems, where the filesystem structures are mapped to
something else rather than stored directly, you should use libnetfs.
(Which is a misnomer: libvirtfs or something like that would fit much
better -- just like libdiskfs should rather be named libstorefs...)

Frankly speaking, I didn't even suppose that libNETfs could be used for this purposes :-) Okay, I'm happy I've acquainted myself with libdiskfs (thought quite superificially), and I'm diving into ftpfs now. I hope I'll be able to cope with new information faster this time. I also hope it is not really bad that I lost time playing with libdiskfs...


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