Fix hfsplus bless ioctl with hardlinks (from Matthew Garrett)

1 files changed, 100 insertions, 0 deletions

diff --git a/hfsplus-Fix-bless-ioctl-when-used-with-hardlinks.patch b/hfsplus-Fix-bless-ioctl-when-used-with-hardlinks.patch
new file mode 100644
index 000000000..3e0b4a5c7
--- /dev/null
+++ b/hfsplus-Fix-bless-ioctl-when-used-with-hardlinks.patch
@@ -0,0 +1,100 @@
+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
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+Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
+	Matthew Garrett <mjg@redhat.com>
+To: hch@infradead.org
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+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
+