dm ioctl: move compat code
Move compat_ioctl handling into dm-ioctl.c.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 4aa1f78..9c49139 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/dm-ioctl.h>
#include <linux/hdreg.h>
+#include <linux/compat.h>
#include <asm/uaccess.h>
@@ -1350,10 +1351,10 @@
{
struct dm_ioctl tmp, *dmi;
- if (copy_from_user(&tmp, user, sizeof(tmp)))
+ if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data)))
return -EFAULT;
- if (tmp.data_size < sizeof(tmp))
+ if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data)))
return -EINVAL;
dmi = vmalloc(tmp.data_size);
@@ -1474,8 +1475,18 @@
return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u);
}
+#ifdef CONFIG_COMPAT
+static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u)
+{
+ return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u));
+}
+#else
+#define dm_compat_ctl_ioctl NULL
+#endif
+
static const struct file_operations _ctl_fops = {
.unlocked_ioctl = dm_ctl_ioctl,
+ .compat_ioctl = dm_compat_ctl_ioctl,
.owner = THIS_MODULE,
};