linux-kernel - Re: [patch 1/13] signal/timer/event fds v6

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Date:	Sat, 17 Mar 2007 21:58:45 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: [patch 1/13] signal/timer/event fds v6 - anonymous inode source ...

On Friday 16 March 2007 01:22:15 Davide Libenzi wrote:

> +
> +static int ainofs_delete_dentry(struct dentry *dentry);
> +static struct inode *aino_getinode(void);
> +static struct inode *aino_mkinode(void);
> +static int ainofs_get_sb(struct file_system_type *fs_type, int flags,
> +			 const char *dev_name, void *data, struct vfsmount *mnt);
> +

In general, it would be good if you could just reorder your functions
so that you don't need any forward declarations like these. It makes
reviewing from bottom to top a little easier and it becomes obvious
that there are no recursions in the code.

> +static struct vfsmount *aino_mnt __read_mostly;
> +static struct inode *aino_inode;
> +static struct file_operations aino_fops = { };

Iirc, file_operations should be const.

> +int aino_getfd(int *pfd, struct inode **pinode, struct file **pfile,
> +	       char const *name, const struct file_operations *fops, void *priv)
> +{

Since this is meant to be a generic interface that can be used
from other subsystems, a kerneldoc style comment would be nice

> +static int __init aino_init(void)
> +{
> +
> +	if (register_filesystem(&aino_fs_type))
> +		goto epanic;
> +
> +	aino_mnt = kern_mount(&aino_fs_type);
> +	if (IS_ERR(aino_mnt))
> +		goto epanic;
> +
> +	aino_inode = aino_mkinode();
> +	if (IS_ERR(aino_inode))
> +		goto epanic;
> +
> +	return 0;
> +
> +epanic:
> +	panic("aino_init() failed\n");
> +}

panic() is a little harsh from a loadable module. If you mean
the aino support to be used as a module, this should probably
just return an error.

> +static void __exit aino_exit(void)
> +{
> +	iput(aino_inode);
> +	unregister_filesystem(&aino_fs_type);
> +	mntput(aino_mnt);
> +}

but since the Makefile always has it as built-in, maybe you should
instead just kill the exit function and use fs_initcall instead
of init_module().

	Arnd <><
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