linux-kernel - Re: [PATCH 20/25] sysfs: Rename Support multiple superblocks

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Date:	Wed, 8 Aug 2007 18:35:05 +0900
From:	Tejun Heo <htejun@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	satyam@...radead.org, cornelia.huck@...ibm.com,
	stern@...land.harvard.edu,
	Linux Containers <containers@...ts.osdl.org>, gregkh@...e.de
Subject: Re: [PATCH 20/25] sysfs: Rename Support multiple superblocks

Hello,

On Tue, Aug 07, 2007 at 03:31:18PM -0600, Eric W. Biederman wrote:
> This patch modifies the sysfs_rename_dir and sysfs_move_dir
> to support multiple sysfs dentry trees rooted in different
> sysfs superblocks.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>

> +struct sysfs_rename_struct {
> +	struct list_head list;
> +	struct dentry *old_dentry;
> +	struct dentry *new_dentry;
> +	struct dentry *old_parent;
> +	struct dentry *new_parent;
> +};

Please rename to sysfs_rename_cxt to it consistent with
sysfs_addrm_cxt.

> +static void post_rename(struct list_head *head)

Please rename to sysfs_post_rename() and add comment.

> +{
> +	struct sysfs_rename_struct *srs;
> +	while (!list_empty(head)) {
> +		srs = list_entry(head->next, struct sysfs_rename_struct, list);
> +		dput(srs->old_dentry);
> +		dput(srs->new_dentry);
> +		dput(srs->old_parent);
> +		dput(srs->new_parent);
> +		list_del(&srs->list);
> +		kfree(srs);
> +	}
> +}
> +
> +static int prep_rename(struct list_head *head,
> +	struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,
> +	const char *name)

Ditto.

> +{
> +	struct sysfs_rename_struct *srs;
> +	struct super_block *sb;
> +	struct dentry *dentry;
> +	int error;
> +
> +	list_for_each_entry(sb, &sysfs_fs_type.fs_supers, s_instances) {
> +		dentry = sysfs_get_dentry(sb, sd);
> +		if (!dentry)
> +			continue;

sysfs_get_dentry() return ERR_PTR() value.  Oops, sysfs_get_dentry()
implementation is wrong too.  Also, please move
sysfs_grab/release_supers() near this patch and add (a lot of)
comments there.

Other than that, I think this is as clean as this can be.  Great.

-- 
tejun
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