linux-kernel - Re: [PATCH 11/16] f2fs: add inode operations for special inodes

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Message-Id: <201210171225.01511.arnd@arndb.de>
Date:	Wed, 17 Oct 2012 12:25:01 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Jaegeuk Kim <jaegeuk.kim@...il.com>
Cc:	Jaegeuk Kim <jaegeuk.kim@...sung.com>,
	"'Dave Chinner'" <david@...morbit.com>,
	"'Vyacheslav Dubeyko'" <slava@...eyko.com>,
	viro@...iv.linux.org.uk, "'Theodore Ts'o'" <tytso@....edu>,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	chur.lee@...sung.com, cm224.lee@...sung.com,
	jooyoung.hwang@...sung.com
Subject: Re: [PATCH 11/16] f2fs: add inode operations for special inodes

On Tuesday 16 October 2012, Jaegeuk Kim wrote:
> > 
> > > > An xattr on the root inode that holds a list like this is something
> > > > that could be set at mkfs time, but then also updated easily by new
> > > > software packages that are installed...
> > 
> > Yes, good idea.
> 
> Likewise many file systems, f2fs also supports xattr as a configurable
> Kconfig option.
> If user disables the xattr feature, how can we do this?

I can see three options here:

* make the extension list feature dependent on xattr, and treat all files
  the same if it's disabled.

* put the list into the superblock instead. 

* fall back on a hardcoded list of extensions when the extended attribute
  is not present or the feature is disabled.

	Arnd
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