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

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Date:	Sun, 14 Oct 2012 15:51:54 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	±èÀç±Ø <jaegeuk.kim@...sung.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

2012-10-13 (í† ), 20:52 +0000, Arnd Bergmann:
> On Friday 05 October 2012, ê¹€ìž¬ê·¹ wrote:
> > +const char *media_ext_lists[] = {
> > +       "jpg",
> > +       "gif",
> > +       "png",
> > +       "avi",
> > +       "divx",
> > +       "mp4",
> > +       "mp3",
> > ...
> 
> > + * Set multimedia files as cold files for hot/cold data separation
> > + */
> > +static inline void set_cold_file(struct inode *inode, const unsigned char *name)
> > +{
> > +       const char **extlist = media_ext_lists;
> > +
> > +       while (*extlist) {
> > +               if (!is_multimedia_file(name, *extlist)) {
> > +                       F2FS_I(inode)->is_cold = 1;
> > +                       break;
> > +               }
> > +               extlist++;
> > +       }
> > +}
> 
> This is a very clever way of categorizing files by their name, but I wonder if hardcoding
> the list of file name extensions at in the kernel source is the best strategy. Generally
> I would consider this to be a policy that should be configurable by the user.
> 
> Unfortunately I can't think of a good interface to configure this, but maybe someone
> else has a useful idea. Maybe the list can be stored in the superblock and get written
> at mkfs time from the same defaults, but with the option of overriding it using
> a debugfs tool.
> 

Good point!
I'll think about a user-made list.
Thanks,

> 	Arnd
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-- 
Jaegeuk Kim
Samsung

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