linux-kernel - Re: [PATCH 07/30] IGET: Stop BEFS from using iget() and read

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Date:	Tue, 02 Oct 2007 13:02:12 +0000
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Zach Brown <zab@...bo.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>, viro@....linux.org.uk,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 07/30] IGET: Stop BEFS from using iget() and
	read_inode()

On Tue, 2007-10-02 at 13:32 +0100, David Howells wrote:
> Zach Brown <zab@...bo.net> wrote:
> 
> > /* haha, continuing the fine tradition of terrible names in this  api..  */
> > static inline void *PTR_PTR(void *err_ptr) {
> > 	BUG_ON(!IS_ERR(err_ptr) || !err_ptr);
> > 	return err_ptr;
> > }
> 
> How about ERR_CAST() instead?  Or maybe CAST_ERR()?

It's a better name than PTR_PTR(). :-)
> 
> 	struct dentry *blah(...)
> 	{
> 		struct inode *inode;
> 
> 		inode = thing(...);
> 		if (IS_ERR(inode))
> 			return ERR_CAST(inode);
> 	}
> 
> Where ERR_CAST is defined as:
> 
> 	static inline void *ERR_CAST(const void *error)
> 	{
> 		return (void *) x;
> 	}

Of course, the cast is unnecessary, and I'm sure you meant to return
error:

static inline void *ERR_CAST(const void *error)
{
	return error;
}

Shaggy
-- 
David Kleikamp
IBM Linux Technology Center

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