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SubjectRe: [PATCH 0/6 v7] overlay filesystem - request for inclusion
On Tuesday 22 March 2011, 19:49:44 Xianghua Xiao wrote:
> On Tue, Mar 22, 2011 at 1:22 PM, Felix Fietkau <>
> > On 2011-03-22 6:36 PM, Linus Torvalds wrote:
> >> On Tue, Mar 22, 2011 at 8:26 AM, Miklos Szeredi <>
> >>> 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?

and aufs2: it's a minimalistic version of a layered filesystem, being
much less capable then its ancestors, but hopefully the right approach
to get the foot in the door.. Unfortunately, it's locking out NFS,
which is a big miss for diskless usage scenarios (where layered
filesystems are also used commonly since ages..).

Probably, it will grow up, Al gets the VFS sorted out from a FS layering
perspective, Valerie Aurora and friends get union mounts operating and
merged, and/or Linus finally merges Junjiro Okajima's aufs2, which is
often used in production environments today, where other layered
filesystem approaches are unusable or simply fail in practice.

Btw: Fortunately, Junjiro, being a Tokio habitant, wasn't injured from
the earth quake nor the tzunami, and let us all pray five minutes for
success and survival of those brave guys, that try to fix the cooling
in the Fukushima atomic plant.

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