[PATCH] dm: Fix 64/32 bit ioctl problems.

From: Kevin Corry <kevcorry@us.ibm.com>

Fix 64/32 bit ioctl problems.

include/linux/compat_ioctl.h

@@ -123,6 +123,19 @@ COMPATIBLE_IOCTL(STOP_ARRAY)
 COMPATIBLE_IOCTL(STOP_ARRAY_RO)
 COMPATIBLE_IOCTL(RESTART_ARRAY_RW)
 /* DM */
+COMPATIBLE_IOCTL(DM_VERSION_32)
+COMPATIBLE_IOCTL(DM_LIST_DEVICES_32)
+COMPATIBLE_IOCTL(DM_DEV_CREATE_32)
+COMPATIBLE_IOCTL(DM_DEV_REMOVE_32)
+COMPATIBLE_IOCTL(DM_DEV_RENAME_32)
+COMPATIBLE_IOCTL(DM_DEV_SUSPEND_32)
+COMPATIBLE_IOCTL(DM_DEV_STATUS_32)
+COMPATIBLE_IOCTL(DM_DEV_WAIT_32)
+COMPATIBLE_IOCTL(DM_TABLE_LOAD_32)
+COMPATIBLE_IOCTL(DM_TABLE_CLEAR_32)
+COMPATIBLE_IOCTL(DM_TABLE_DEPS_32)
+COMPATIBLE_IOCTL(DM_TABLE_STATUS_32)
+COMPATIBLE_IOCTL(DM_LIST_VERSIONS_32)
 COMPATIBLE_IOCTL(DM_VERSION)
 COMPATIBLE_IOCTL(DM_LIST_DEVICES)
 COMPATIBLE_IOCTL(DM_DEV_CREATE)

include/linux/dm-ioctl.h

@@ -200,6 +200,34 @@ enum {
 	DM_LIST_VERSIONS_CMD,
 };
 
+/*
+ * The dm_ioctl struct passed into the ioctl is just the header
+ * on a larger chunk of memory.  On x86-64 and other
+ * architectures the dm-ioctl struct will be padded to an 8 byte
+ * boundary so the size will be different, which would change the
+ * ioctl code - yes I really messed up.  This hack forces these
+ * architectures to have the correct ioctl code.
+ */
+#ifdef CONFIG_COMPAT
+typedef char ioctl_struct[308];
+#define DM_VERSION_32       _IOWR(DM_IOCTL, DM_VERSION_CMD, ioctl_struct)
+#define DM_REMOVE_ALL_32    _IOWR(DM_IOCTL, DM_REMOVE_ALL_CMD, ioctl_struct)
+#define DM_LIST_DEVICES_32  _IOWR(DM_IOCTL, DM_LIST_DEVICES_CMD, ioctl_struct)
+
+#define DM_DEV_CREATE_32    _IOWR(DM_IOCTL, DM_DEV_CREATE_CMD, ioctl_struct)
+#define DM_DEV_REMOVE_32    _IOWR(DM_IOCTL, DM_DEV_REMOVE_CMD, ioctl_struct)
+#define DM_DEV_RENAME_32    _IOWR(DM_IOCTL, DM_DEV_RENAME_CMD, ioctl_struct)
+#define DM_DEV_SUSPEND_32   _IOWR(DM_IOCTL, DM_DEV_SUSPEND_CMD, ioctl_struct)
+#define DM_DEV_STATUS_32    _IOWR(DM_IOCTL, DM_DEV_STATUS_CMD, ioctl_struct)
+#define DM_DEV_WAIT_32      _IOWR(DM_IOCTL, DM_DEV_WAIT_CMD, ioctl_struct)
+
+#define DM_TABLE_LOAD_32    _IOWR(DM_IOCTL, DM_TABLE_LOAD_CMD, ioctl_struct)
+#define DM_TABLE_CLEAR_32   _IOWR(DM_IOCTL, DM_TABLE_CLEAR_CMD, ioctl_struct)
+#define DM_TABLE_DEPS_32    _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, ioctl_struct)
+#define DM_TABLE_STATUS_32  _IOWR(DM_IOCTL, DM_TABLE_STATUS_CMD, ioctl_struct)
+#define DM_LIST_VERSIONS_32 _IOWR(DM_IOCTL, DM_LIST_VERSIONS_CMD, ioctl_struct)
+#endif
+
 #define DM_IOCTL 0xfd
 
 #define DM_VERSION       _IOWR(DM_IOCTL, DM_VERSION_CMD, struct dm_ioctl)