Re: [Ext2-devel] [RFC] [PATCH 2/4] Add extended attributes to ext2/3

[Christoph Hellwig <hch@infradead.org>]

On Tue, Oct 08, 2002 at 02:08:14PM -0400, tytso@mit.edu wrote:
> 
> This is the second of four patches which add extended attribute support
> to the ext2 and ext3 filesystems.  Please comment and bleed.
> 
> This patch creates a meta block cache which is utilized by the ext3 and
> ext2 extended attribute patch (patches 3 and 4, respectively).  This
> cache allows directory blocks to be indexed by multiple keys.  In the
> case of the extended attribute patches, it is used to look up blocks by
> both the block number and by the hash of the extended attributes.  This
> is extremely important to allow the sharing of acl's when stored as
> extended attributes.  Otherwise every single file would require its own,
> separate, one block overhead to store then ACL, even though there might
> be a large number of files that have the same ACL.

The code doesn't really make æny sense outside ext2/ext3. I'd suggest you
move it there instead of bloating every kernel with it unconditionally.

__mb_cache_entry_in_lru() is buggy and can't work anymore now that akpm removed
some list_head debugging.

And please get rid of the LINUX_VERSION_CODE checks..