ocfs2: Use compat_ptr in reflink_arguments.

Although we use u64 to pass userspace pointers to the kernel
to avoid compat_ioctl, it doesn't work in some ppc platform.
So wrap them with compat_ptr and add compat_ioctl.

The detailed discussion about compat_ptr can be found in thread
http://lkml.org/lkml/2009/10/27/423.

We indeed met with a bug when testing on ppc(-EFAULT is returned
when using old_path). This patch try to fix this.
I have tested in ppc64(with 32 bit reflink) and x86_64(with i686
reflink), both works.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index 31fbb061951035d3211e1041e5b39bb6ed8d6db9..7d9d9c132cef3a5d59a412aa4d0d3c26c10a5fb0 100644 (file)
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -7,6 +7,7 @@
 
 #include <linux/fs.h>
 #include <linux/mount.h>
+#include <linux/compat.h>
 
 #define MLOG_MASK_PREFIX ML_INODE
 #include <cluster/masklog.h>
@@ -181,6 +182,10 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 #ifdef CONFIG_COMPAT
 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 {
+       bool preserve;
+       struct reflink_arguments args;
+       struct inode *inode = file->f_path.dentry->d_inode;
+
        switch (cmd) {
        case OCFS2_IOC32_GETFLAGS:
                cmd = OCFS2_IOC_GETFLAGS;
@@ -195,8 +200,15 @@ long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
        case OCFS2_IOC_GROUP_EXTEND:
        case OCFS2_IOC_GROUP_ADD:
        case OCFS2_IOC_GROUP_ADD64:
-       case OCFS2_IOC_REFLINK:
                break;
+       case OCFS2_IOC_REFLINK:
+               if (copy_from_user(&args, (struct reflink_arguments *)arg,
+                                  sizeof(args)))
+                       return -EFAULT;
+               preserve = (args.preserve != 0);
+
+               return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
+                                          compat_ptr(args.new_path), preserve);
        default:
                return -ENOIOCTLCMD;
        }