linux-kernel - Re: [PATCH V2 2/2] hfsplus: Add an ioctl to bless files

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Message-ID: <20120206173553.GB1135@infradead.org>
Date:	Mon, 6 Feb 2012 12:35:53 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org
Subject: Re: [PATCH V2 2/2] hfsplus: Add an ioctl to bless files

+#define HFSPLUS_IOC_BLESS              _IO('f', 0x20)

I'd probably move this to fs.h and follow the numbering there,
otherwise we are bound to run into conflicts.

> +static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)

Care to add a little comment on what this ioctl does, bless is a bit
of a generic name.

> +{
> +	struct inode *inode = file->f_dentry->d_inode;

Please use file->f_path.dentry instead of the f_dentry define, please.

Also given that we use the dentry almost as often I'd pull it into a
local variable as well.

> +	mutex_lock(&sbi->vh_mutex);
> +	vh->finder_info[0] = bvh->finder_info[0] =
> +		cpu_to_be32(parent_ino(file->f_dentry));
> +	vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(inode->i_ino);
> +	vh->finder_info[5] = bvh->finder_info[5] =
> +		cpu_to_be32(parent_ino(file->f_dentry));

Any idea why we write the parent twice?



Not directly relevant, but where do you plan to put the userspace to
call this ioctl?
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