linux-kernel - Re: [PATCH 0/6 v7] overlay filesystem

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Message-ID: <AANLkTim-_h9_mp3hPQXndTc3gR+AJKj+keoN2yDZV2Sr@mail.gmail.com>
Date:	Tue, 22 Mar 2011 13:49:44 -0500
From:	Xianghua Xiao <xiaoxianghua@...il.com>
To:	Felix Fietkau <nbd@...nwrt.org>
Cc:	linux-kernel@...r.kernel.org, neilb@...e.de
Subject: Re: [PATCH 0/6 v7] overlay filesystem - request for inclusion

On Tue, Mar 22, 2011 at 1:22 PM, Felix Fietkau <nbd@...nwrt.org> wrote:
> On 2011-03-22 6:36 PM, Linus Torvalds wrote:
>> On Tue, Mar 22, 2011 at 8:26 AM, Miklos Szeredi <miklos@...redi.hu> wrote:
>>> Here's an updated version of the overlay filesystem.  I'd like to
>>> propose it for inclusion into mainline.
>>
>> So on the whole it looked pretty small and simple. And most of the VFS
>> level changes looked fine and I just reacted to the odd calling
>> convention for open (I really think you should aim for ->open to have
>> the basically same arguments as you made __dentry_open have: 'struct
>> path', 'struct filp' and 'struct cred').
>>
>> But I'd want Al's ack on the series. And also hear who uses it and how
>> it's been tested?
> We're using it in OpenWrt (an Embedded Linux distribution) for devices
> with tiny amounts of flash for the entire system (e.g. 4 MB).
> We're using it to provide a writable on-flash root filesystem with
> squashfs for the read-only part and jffs2 for the writable overlay. This
> saves some precious flash space compared to using only jffs2, and it
> makes it easy for users to reset their device to defaults without having
> to reflash.
> With a backport of v6 of this series + my fixes that went into v7 this
> is working quite well on 2.6.37 and 2.6.38 - I'm using it on a few
> wireless access points at home.
>
> - Felix
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how is this filesystem related to mini_fo and unionfs?
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