linux-kernel - Re: [RFC 3/7] cramfs: allow unlinking of files

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Message-Id: <200806012328.57577.arnd@arndb.de>
Date:	Sun, 1 Jun 2008 23:28:57 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Jörn Engel <joern@...fs.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@....de
Subject: Re: [RFC 3/7] cramfs: allow unlinking of files

On Sunday 01 June 2008, Jörn Engel wrote:
> On Sat, 31 May 2008 17:20:16 +0200, arnd@...db.de wrote:
> >  
> > +int cramfs_unlink(struct inode *dir, struct dentry *dentry)
> > +{
> > +     struct inode *inode = dentry->d_inode;
> > +     struct dentry *new;
> > +
> > +     inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
> > +     drop_nlink(inode);
> > +     new = d_alloc(dentry->d_parent, &dentry->d_name);
> > +     d_add(new, NULL);
> > +
> > +     dget(dentry);
> 
> How is the negative dentry dropped on umount?  Looks like we want a
> per-sb list to put them on.  Then we can walk it and dput each one at
> umount time.

Good point. I think ramfs does exactly that, using kill_litter_super.
I haven't tested unmount so far, and should probably do something like
that in cramfs_put_super.

	Arnd <><
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