linux-kernel - Re: [patch 07/10] vfs: add path

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Date:	Fri, 04 Apr 2008 20:04:23 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	ezk@...sunysb.edu
CC:	miklos@...redi.hu, viro@...iv.linux.org.uk,
	akpm@...ux-foundation.org, dave@...ux.vnet.ibm.com,
	ezk@...sunysb.edu, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 07/10] vfs: add path_rename()

> > From: Miklos Szeredi <mszeredi@...e.cz>
> > 
> > Introduce path_rename().  Make vfs_rename() static.
> [...]
> > +int path_rename(struct path *old_dir_path, struct dentry *old_dentry,
> > +		struct inode *new_dir, struct dentry *new_dentry)
> > +{
> > +	int error = mnt_want_write(old_dir_path->mnt);
> > +
> > +	if (!error) {
> > +		struct inode *old_dir = old_dir_path->dentry->d_inode;
> > +
> > +		error = vfs_rename(old_dir, old_dentry, new_dir, new_dentry);
> > +		mnt_drop_write(old_dir_path->mnt);
> > +	}
> > +
> > +	return error;
> > +}
> > +EXPORT_SYMBOL(path_rename);
> 
> You're grabbing a want_write ref on the source vfsmount only.  Shouldn't
> path_rename() call mnt_want_write on *both* the source and destination
> vfsmounts?

The source and the destination vfsmounts are always the same.

> If so, do we need to order the locks ala lock_rename()?

These are counters (similar to reference counts), not locks.

Miklos
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