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From: Nikita Danilov <nikita@clusterfs.com>
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Date: Sat, 29 Jul 2006 22:57:56 +0400
To: David Masover <ninja@slaphack.com>
Cc: Hans Reiser <reiser@namesys.com>, Linus Torvalds <torvalds@osdl.org>,
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       Theodore Tso <tytso@mit.edu>, LKML <linux-kernel@vger.kernel.org>,
       ReiserFS List <reiserfs-list@namesys.com>
Subject: Re: metadata plugins (was Re: the " 'official' point of view" expressed
 by kernelnewbies.org regarding reiser4 inclusion)
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David Masover writes:
 > Nikita Danilov wrote:
 > 
 > > As you see, ext2 code already has multiple file "plugins", with
 > > persistent "plugin id" (stored in i_mode field of on-disk struct
 > > ext2_inode).
 > 
 > Aha!  So here's another question:  Is it fair to ask Reiser4 to make its
 > plugins generic, or should we be asking ext2/3 first?

ext2/3 plugins are generic: in Linux every file system can implement
per-object behavior by specifying
{file,inode,dentry,address_space}_operations. This mechanism is provided
by VFS (and, in fact, is the only way that VFS interacts with file
system) and is completely generic.

 > 

Nikita.