linux-kernel - Re: metadata plugins (was Re: the " 'official' point of view" expressed by kernelnewbies.org regarding reiser4 inclusion)

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Date:	Sat, 29 Jul 2006 22:57:56 +0400
From:	Nikita Danilov <nikita@...sterfs.com>
To:	David Masover <ninja@...phack.com>
Cc:	Hans Reiser <reiser@...esys.com>,
	Linus Torvalds <torvalds@...l.org>,
	"Horst H. von Brand" <vonbrand@....utfsm.cl>,
	Jeff Garzik <jeff@...zik.org>, Andrew Morton <akpm@...l.org>,
	Theodore Tso <tytso@....edu>,
	LKML <linux-kernel@...r.kernel.org>,
	ReiserFS List <reiserfs-list@...esys.com>
Subject: Re: metadata plugins (was Re: the " 'official' point of view" expressed
 by kernelnewbies.org regarding reiser4 inclusion)

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.

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