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| author | Tao Ma <tao.ma@oracle.com> | 2010-01-27 10:21:52 +0800 |
|---|---|---|
| committer | Joel Becker <joel.becker@oracle.com> | 2010-02-02 18:56:37 -0800 |
| commit | 34e6c59af06cbca07b1490ec0015ea2d303470d3 (patch) | |
| tree | 1b1199825cf9f658d1abd433ff0d6b0d9f22c1de | |
| parent | cd34edd8cf80b507bb84b3f0c2988fe05099ffb5 (diff) | |
| download | linux-34e6c59af06cbca07b1490ec0015ea2d303470d3.tar.bz2 | |
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>
| -rw-r--r-- | fs/ocfs2/ioctl.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c index 31fbb0619510..7d9d9c132cef 100644 --- 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; } |