linux-kernel - Re: [patch 1/13] signal/timer/event fds v7

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Date:	Mon, 19 Mar 2007 18:38:48 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: [patch 1/13] signal/timer/event fds v7 - anonymous inode source
 ...

On Tue, 20 Mar 2007, Thomas Gleixner wrote:

> > +	error = -ENFILE;
> > +	file = get_empty_filp();
> > +	if (!file)
> > +		goto eexit_1;
> 
> make this "return -ENFILE;" please

Done


> > +	inode = aino_getinode();
> > +	if (IS_ERR(inode)) {
> > +		error = PTR_ERR(inode);
> > +		goto eexit_2;
> 
> Can you please use a bit more descriptive labels ?
> 
> e.g:
> 	goto out_filp;

Done


> > +static int ainofs_delete_dentry(struct dentry *dentry)
> > +{
> > +	/*
> > +	 * We faked vfs to believe the dentry was hashed when we created it.
> > +	 * Now we restore the flag so that dput() will work correctly.
> > +	 */
> > +	dentry->d_flags |= DCACHE_UNHASHED;
> > +	return 1;
> > +}
> 
> Please put either "struct ainofs_dentry_operations ..." below the next
> function or move ainofs_delete_dentry() above "struct
> ainofs_dentry_operations ..."
> 
> It's annoying to lookup the protoypes and implemenation back and forth.

I prefer to have all data declarations at the beginning. but if you can 
manage to have that requirement in the Coding Style, I'll change it ;)



> > +static struct inode *aino_getinode(void)
> > +{
> > +	return igrab(aino_inode);
> > +}
> 
> Please use "igrab(aino_inode);" directly in this one single place above.
> That saves us a prototype and an useless static function with no value.

Done



> > +/*
> > + * A single inode exist for all aino files. On the contrary of pipes,
> > + * aino inodes has no per-instance data associated, so we can avoid
> > + * the allocation of multiple of them.
> > + */
> > +static struct inode *aino_mkinode(void)
> > +{
> > +	int error = -ENOMEM;
> > +	struct inode *inode = new_inode(aino_mnt->mnt_sb);
> > +
> > +	if (!inode)
> > +		goto eexit_1;
> 
> 	return ERR_PTR(-ENOMEM);

Done


> > +	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 ? It's not life critical - is it ? 
> 
> A printk(KERN_ERR...) and a return -Exx would be sufficient.

Done.




- Davide


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