linux-kernel - Re: 2.6.29 -mm merge plans

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Date:	Tue, 6 Jan 2009 18:31:53 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	"Diego E. 'Flameeyes' Petten?" <flameeyes@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Warren Turkal <wt@...guintechs.org>,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: 2.6.29 -mm merge plans

Yes, the version you attached looks much better, and correct.

Just some minor comments:

> +++ b/fs/hfsplus/export.c
> @@ -0,0 +1,118 @@
> +/*
> + *  linux/fs/hfsplus/export.c
> + *

Please don't put filenames in top of file comments.  They don't serve
any purpose and easily get out of date.

> +	if ( be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {

no space after the opening brace, please/

> +	inode = hfsplus_iget(child->d_sb, be32_to_cpu(entry.thread.parentID));
> +	if (IS_ERR(inode)) {
> +		printk(KERN_ERR "hfs: unable to find parent, call the social services\n");
> +		return ERR_CAST(inode);
> +	}

no lines longer than 80 characters please.

> +	inode = hfsplus_iget(sb, ino);
> +	if (IS_ERR(inode))
> +		return ERR_CAST(inode);
> +
> +	/* probably superfluous but it does not seem to hurt */
> +	if (generation && inode->i_generation != generation) {
> +		/* we didn't find the right inode.. */
> +		iput(inode);
> +		return ERR_PTR(-ESTALE);
> +	}
> +	return inode;

Given that hfsplus never sets i_generation it's superflous.  So just
write the above as

	return hfsplus_iget(sb, ino);

And maybe write a little comment that there is no generation number
in hfsplus.

> +/* Yes, most of these are left as NULL!!
> + * A NULL value implies the default, which works with hfs+-like file
> + * systems, but can be improved upon.
> + */

No need for this comment I think.  All this is pretty well documented
in Documentation/filesystems/Exporting, and all the other filesystems
that just fill out these three methods don't comment on it either.

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