linux-kernel - Re: Using kernel filesystems as userland libraries

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Date:	Tue, 25 Nov 2014 15:46:59 +0800
From:	xun ni <ni.xun.intel@...il.com>
To:	Nicolas George <george@...p.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Using kernel filesystems as userland libraries

Hi, George:

   is there any reason to do this? we still need to copy files from
userspace to kernel.

Thanks,
Xun

2014-11-24 21:12 GMT+08:00 Nicolas George <george@...p.org>:
> Hi.
>
> With the libraries present in e2fsprogs, it is possible to open a plain file
> (or any other reasonable storage) as an EXT2 filesystem and manipulate files
> inside it.
>
> Is it possible to use the implementations in the kernel to do the same thing
> with any supported normal filesystem?
>
> Obviously, it is theoretically possible, but my question is whether it has
> been done in practice. I suppose it would require writing userland
> replacement for the kernel APIs (memory management, access to block devices,
> scheduling) and either rebuilding the kernel source as userland code or
> loading the modules directly.
>
> Regards,
>
> --
>   Nicolas George
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