linux-kernel - Re: [PATCH 03/22][RFC] Unionfs: Branch management functionality

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Message-ID: <84144f020609040420l5c24a48ci2b7b53516e74bcee@mail.gmail.com>
Date:	Mon, 4 Sep 2006 14:20:43 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Josef Sipek" <jsipek@...sunysb.edu>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	hch@...radead.org, akpm@...l.org, viro@....linux.org.uk
Subject: Re: [PATCH 03/22][RFC] Unionfs: Branch management functionality

On 9/1/06, Josef Sipek <jsipek@...sunysb.edu> wrote:
> +struct dentry **alloc_new_dentries(int objs)
> +{
> +       if (!objs)
> +               return NULL;
> +
> +       return kzalloc(sizeof(struct dentry *) * objs, GFP_KERNEL);

kcalloc

> +struct unionfs_usi_data *alloc_new_data(int objs)
> +{
> +       if (!objs)
> +               return NULL;
> +
> +       return kzalloc(sizeof(struct unionfs_usi_data) * objs, GFP_KERNEL);
> +}

Same here. I suggest you kill the wrappers too.

> +int unionfs_ioctl_incgen(struct file *file, unsigned int cmd, unsigned long arg)
> +{
> +       struct super_block *sb;
> +       int gen;
> +
> +       sb = file->f_dentry->d_sb;
> +
> +       unionfs_write_lock(sb);
> +
> +       atomic_inc(&stopd(sb)->usi_generation);
> +       gen = atomic_read(&stopd(sb)->usi_generation);

You could use atomic_inc_return here. Is usi_generation protected by
write lock on sb or do you really need atomic ops?

> +
> +       atomic_set(&dtopd(sb->s_root)->udi_generation, gen);
> +       atomic_set(&itopd(sb->s_root->d_inode)->uii_generation, gen);
> +
> +       unionfs_write_unlock(sb);
> +
> +       return gen;
> +}

-- 
VGER BF report: U 0.5
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