linux-kernel - Re: [PATCH] LogFS take three

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Date:	Sat, 19 May 2007 02:15:33 -0400
From:	Rob Landley <rob@...dley.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jörn Engel <joern@...ybastard.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, Albert Cahalan <acahalan@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Greg KH <greg@...ah.com>, Ingo Oeser <ioe-lkml@...eria.de>
Subject: Re: [PATCH] LogFS take three

On Tuesday 15 May 2007 4:37 pm, Andrew Morton wrote:

> > +static inline struct logfs_super *LOGFS_SUPER(struct super_block *sb)
> > +{
> > +	return sb->s_fs_info;
> > +}
> > +
> > +static inline struct logfs_inode *LOGFS_INODE(struct inode *inode)
> > +{
> > +	return container_of(inode, struct logfs_inode, vfs_inode);
> > +}
> 
> Do these need to be uppercase?

I'm trying to keep it clear in my head...

When do you need to say __always_inline and when can you get away with just 
saying "static inline"?

(I'm attempting to write documentation on a topic I don't understand.  Best 
way to learn it, I've found...)

> > +     buf = kmap(page);
> > +     ret = logfs_write_buf(inode, index, buf);
> > +     kunmap(page);
>
> kmap() is lame.  The preferred approach would be to pass the page* down to
> the lower layers and to use kmap_atomic() at the lowest possible point.

Um, would I read about this in DMA-mapping.txt or cachetlb.txt?  (I don't 
think it's fujitsu/frv/mmu-layout.txt)

Rob
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