inode parent pointer attributes

inode parent pointer attributes

[Roger Willcocks]

Hi folks,

Commit 6d73cf133c5477f7038577bfeda603ce9946f8cb reintroduced the
XFS_SB_VERSION2_PARENTBIT in the kernel headers, which is described
in the xfs filesystem structure document as 'All inodes must have an
extended attribute that points back to its parent inode'.

There's currently (afaict) no Linux kernel implementation of this. But
it's something I would find very useful for a filesystem extension I'm
working on.

I'm quite happy to add the necessary code to maintain parent attributes
myself, borrowing from the posix acl code, but it would make sense to
make it compatible with the original - seemingly undocumented -
attribute names and encoding scheme.

So my questions are: is this something that's being worked on already,
and/or is there any information about the corresponding extended
attributes?

--
Roger

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Re: inode parent pointer attributes

[Christoph Hellwig]

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On Fri, Apr 23, 2010 at 12:07:08PM +0100, Roger Willcocks wrote:
> Hi folks,
>
> Commit 6d73cf133c5477f7038577bfeda603ce9946f8cb reintroduced the
> XFS_SB_VERSION2_PARENTBIT in the kernel headers, which is described
> in the xfs filesystem structure document as 'All inodes must have an
> extended attribute that points back to its parent inode'.
>
> There's currently (afaict) no Linux kernel implementation of this. But
> it's something I would find very useful for a filesystem extension I'm
> working on.

Work on the Linux port of this feature stopped when SGI closed the
Melbourne engineering office where people were working on it.
Fortunately SGI did publish the latest development state of it for
others to continue.  I've attached my local copy in case you're
interested on finishing this.


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Re: inode parent pointer attributes

[Roger Willcocks]

On 23 Apr 2010, at 14:00, Christoph Hellwig wrote:

> On Fri, Apr 23, 2010 at 12:07:08PM +0100, Roger Willcocks wrote:
>> Hi folks,
>>
>> Commit 6d73cf133c5477f7038577bfeda603ce9946f8cb reintroduced the
>> XFS_SB_VERSION2_PARENTBIT in the kernel headers, which is described
>> in the xfs filesystem structure document as 'All inodes must have an
>> extended attribute that points back to its parent inode'.
>>
>> There's currently (afaict) no Linux kernel implementation of this.  
>> But
>> it's something I would find very useful for a filesystem extension  
>> I'm
>> working on.
>
> Work on the Linux port of this feature stopped when SGI closed the
> Melbourne engineering office where people were working on it.
> Fortunately SGI did publish the latest development state of it for
> others to continue.  I've attached my local copy in case you're
> interested on finishing this.
>

Thanks Christoph, I'll take a look.

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