[PATCH] dm-ioctl.h - device-mapper ioctl packet fixes

[Kevin Corry <corryk@us.ibm.com>]

Joe, Linus,

This patch fixes some device-mapper ioctl packet definitions in dm-ioctl.h
in 2.5.51.

Notes:
- The "dev" fields in "struct dm_ioctl" and "struct dm_target_deps" should
  be fixed-size to avoid requiring translation code on architectures such as
  ppc64 and sparc64 with 32-bit user-space and 64-bit kernel-space.
- The "length" field in "struct dm_target_spec" should be should be 64-bit
  to allow single targets within a device to be greater than 2 TB.
- The "status" field in "struct dm_target_spec" should be moved to ensure
  proper field alignment on 64-bit architectures.
- The version of the ioctl interface changes from 1.0.6 to 2.0.0, because
  the new structure definitions are not backwards compatible with the previous
  definitions.

-- 
Kevin Corry
corryk@us.ibm.com
http://evms.sourceforge.net/


--- linux-2.5.51a/include/linux/dm-ioctl.h	Tue Dec 10 10:59:55 2002
+++ linux-2.5.51b/include/linux/dm-ioctl.h	Wed Nov 20 14:44:06 2002
@@ -50,7 +50,7 @@
 	uint32_t open_count;	/* out */
 	uint32_t flags;		/* in/out */
 
-	__kernel_dev_t dev;	/* in/out */
+	uint32_t dev;		/* in/out */
 
 	char name[DM_NAME_LEN];	/* device name */
 	char uuid[DM_UUID_LEN];	/* unique identifier for
@@ -62,9 +62,9 @@
  * dm_ioctl.
  */
 struct dm_target_spec {
-	int32_t status;		/* used when reading from kernel only */
 	uint64_t sector_start;
-	uint32_t length;
+	uint64_t length;
+	int32_t status;		/* used when reading from kernel only */
 
 	/*
 	 * Offset in bytes (from the start of this struct) to
@@ -87,7 +87,7 @@
 struct dm_target_deps {
 	uint32_t count;
 
-	__kernel_dev_t dev[0];	/* out */
+	uint32_t dev[0];	/* out */
 };
 
 /*
@@ -129,10 +129,10 @@
 #define DM_TARGET_STATUS _IOWR(DM_IOCTL, DM_TARGET_STATUS_CMD, struct dm_ioctl)
 #define DM_TARGET_WAIT   _IOWR(DM_IOCTL, DM_TARGET_WAIT_CMD, struct dm_ioctl)
 
-#define DM_VERSION_MAJOR	1
+#define DM_VERSION_MAJOR	2
 #define DM_VERSION_MINOR	0
-#define DM_VERSION_PATCHLEVEL	6
-#define DM_VERSION_EXTRA	"-ioctl (2002-10-15)"
+#define DM_VERSION_PATCHLEVEL	0
+#define DM_VERSION_EXTRA	"-ioctl (2002-12-10)"
 
 /* Status bits */
 #define DM_READONLY_FLAG	0x00000001