linux-kernel - Re: [PATCH 3.14 103/114] CIFS: Fix directory rename error

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Date:	Tue, 16 Sep 2014 07:40:47 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Pavel Shilovsky <pshilovsky@...ba.org>
Cc:	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Steve French <smfrench@...il.com>
Subject: Re: [PATCH 3.14 103/114] CIFS: Fix directory rename error

On Tue, Sep 16, 2014 at 09:17:33AM +0400, Pavel Shilovsky wrote:
> 2014-09-15 23:26 GMT+04:00 Greg Kroah-Hartman <gregkh@...uxfoundation.org>:
> > 3.14-stable review patch.  If anyone has any objections, please let me know.
> >
> > ------------------
> >
> > From: Pavel Shilovsky <pshilovsky@...ba.org>
> >
> > commit a07d322059db66b84c9eb4f98959df468e88b34b upstream.
> >
> > CIFS servers process nlink counts differently for files and directories.
> > In cifs_rename() if we the request fails on the existing target, we
> > try to remove it through cifs_unlink() but this is not what we want
> > to do for directories. As the result the following sequence of commands
> >
> > mkdir {1,2}; mv -T 1 2; rmdir {1,2}; mkdir {1,2}; echo foo > 2/bar
> >
> > and XFS test generic/023 fail with -ENOENT error. That's why the second
> > mkdir reuses the existing inode (target inode of the mv -T command) with
> > S_DEAD flag.
> >
> > Fix this by checking whether the target is directory or not and
> > calling cifs_rmdir() rather than cifs_unlink() for directories.
> >
> > Signed-off-by: Pavel Shilovsky <pshilovsky@...ba.org>
> > Signed-off-by: Steve French <smfrench@...il.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >
> > ---
> >  fs/cifs/inode.c |    5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > --- a/fs/cifs/inode.c
> > +++ b/fs/cifs/inode.c
> > @@ -1706,7 +1706,10 @@ cifs_rename(struct inode *source_dir, st
> >  unlink_target:
> >         /* Try unlinking the target dentry if it's not negative */
> >         if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
> > -               tmprc = cifs_unlink(target_dir, target_dentry);
> > +               if (d_is_dir(target_dentry))
> > +                       tmprc = cifs_rmdir(target_dir, target_dentry);
> > +               else
> > +                       tmprc = cifs_unlink(target_dir, target_dentry);
> >                 if (tmprc)
> >                         goto cifs_rename_exit;
> >                 rc = cifs_do_rename(xid, source_dentry, from_name,
> >
> >
> 
> Does the next stable-3.14.y have d_is_dir()? v3.14.18 doesn't compile this one.

It does, look in the patch prior to this one in the queue.

thanks,

greg k-h
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