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

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Message-id: <000501cdacf2$b604bf80$220e3e80$%kim@samsung.com>
Date:	Thu, 18 Oct 2012 14:37:49 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	'Arnd Bergmann' <arnd@...db.de>,
	'Jaegeuk Kim' <jaegeuk.kim@...il.com>
Cc:	'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.
> 

IMHO, we don't need to disable the extension list among the cases.
So, as I described before, I propose the following options.

* By default, mkfs stores an extension list in superblock, and f2fs simply
   uses it.
* If users try to handle cold files by themselves, they can give a hint
  via the xattr interface.
* Whenever they want not to use the default extension list, they can
  easily disable it by a mount option.

> 	Arnd

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