kernel/hfsplus-Fix-bless-ioctl-when-used-with-hardlinks.patch

101 lines
4.5 KiB
Diff
Raw Normal View History

Path: news.gmane.org!not-for-mail
From: Matthew Garrett <mjg@redhat.com>
Newsgroups: gmane.linux.kernel,gmane.linux.file-systems
Subject: [PATCH V2] hfsplus: Fix bless ioctl when used with hardlinks
Date: Mon, 16 Apr 2012 16:57:18 -0400
Lines: 45
Approved: news@gmane.org
Message-ID: <1334609838-14831-1-git-send-email-mjg@redhat.com>
NNTP-Posting-Host: plane.gmane.org
X-Trace: dough.gmane.org 1334609870 7622 80.91.229.3 (16 Apr 2012 20:57:50 GMT)
X-Complaints-To: usenet@dough.gmane.org
NNTP-Posting-Date: Mon, 16 Apr 2012 20:57:50 +0000 (UTC)
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Matthew Garrett <mjg@redhat.com>
To: hch@infradead.org
Original-X-From: linux-kernel-owner@vger.kernel.org Mon Apr 16 22:57:49 2012
Return-path: <linux-kernel-owner@vger.kernel.org>
Envelope-to: glk-linux-kernel-3@plane.gmane.org
Original-Received: from vger.kernel.org ([209.132.180.67])
by plane.gmane.org with esmtp (Exim 4.69)
(envelope-from <linux-kernel-owner@vger.kernel.org>)
id 1SJszc-0006G8-Gd
for glk-linux-kernel-3@plane.gmane.org; Mon, 16 Apr 2012 22:57:48 +0200
Original-Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
id S1755330Ab2DPU5g (ORCPT <rfc822;glk-linux-kernel-3@m.gmane.org>);
Mon, 16 Apr 2012 16:57:36 -0400
Original-Received: from mx1.redhat.com ([209.132.183.28]:44295 "EHLO mx1.redhat.com"
rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
id S1752969Ab2DPU5e (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
Mon, 16 Apr 2012 16:57:34 -0400
Original-Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22])
by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q3GKvQoA029518
(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK);
Mon, 16 Apr 2012 16:57:26 -0400
Original-Received: from cavan.codon.org.uk (ovpn-113-122.phx2.redhat.com [10.3.113.122])
by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id q3GKvP1p017146
(version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO);
Mon, 16 Apr 2012 16:57:26 -0400
Original-Received: from nat-pool-rdu.redhat.com ([66.187.233.202] helo=x220.boston.devel.redhat.com)
by cavan.codon.org.uk with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)
(Exim 4.72)
(envelope-from <mjg@redhat.com>)
id 1SJszC-0003jY-P9; Mon, 16 Apr 2012 21:57:23 +0100
X-SA-Do-Not-Run: Yes
X-SA-Exim-Connect-IP: 66.187.233.202
X-SA-Exim-Mail-From: mjg@redhat.com
X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false
X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22
Original-Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Xref: news.gmane.org gmane.linux.kernel:1282933 gmane.linux.file-systems:63394
Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1282933>
HFS+ doesn't really implement hard links - instead, hardlinks are indicated
by a magic file type which refers to an indirect node in a hidden
directory. The spec indicates that stat() should return the inode number
of the indirect node, but it turns out that this doesn't satisfy the
firmware when it's looking for a bootloader - it wants the catalog ID of
the hardlink file instead. Fix up this case.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
---
V2 cleans up the casting.
fs/hfsplus/ioctl.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/fs/hfsplus/ioctl.c b/fs/hfsplus/ioctl.c
index c640ba5..09addc8 100644
--- a/fs/hfsplus/ioctl.c
+++ b/fs/hfsplus/ioctl.c
@@ -31,6 +31,7 @@ static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)
struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
struct hfsplus_vh *vh = sbi->s_vhdr;
struct hfsplus_vh *bvh = sbi->s_backup_vhdr;
+ u32 cnid = (unsigned long)dentry->d_fsdata;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -41,8 +42,12 @@ static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)
vh->finder_info[0] = bvh->finder_info[0] =
cpu_to_be32(parent_ino(dentry));
- /* Bootloader */
- vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(inode->i_ino);
+ /*
+ * Bootloader. Just using the inode here breaks in the case of
+ * hard links - the firmware wants the ID of the hard link file,
+ * but the inode points at the indirect inode
+ */
+ vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid);
/* Per spec, the OS X system folder - same as finder_info[0] here */
vh->finder_info[5] = bvh->finder_info[5] =
--
1.7.10