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authorNeilBrown <neilb@suse.de>2005-11-08 21:39:32 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-09 07:56:38 -0800
commitbd926c63b7a6843d3ce2728396c0891e54fce5c4 (patch)
tree38f7083a733e9b31efe69616c5fa3448c74c1320 /include/linux/raid
parentb2d444d7ad975d555bb919601bcdc0e58975a40e (diff)
[PATCH] md: make md on-disk bitmaps not host-endian
Current bitmaps use set_bit et.al and so are host-endian, which means not-portable. Oops. Define a new version number (4) for which bitmaps are little-endian. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/raid')
-rw-r--r--include/linux/raid/bitmap.h11
-rw-r--r--include/linux/raid/md.h4
2 files changed, 12 insertions, 3 deletions
diff --git a/include/linux/raid/bitmap.h b/include/linux/raid/bitmap.h
index 9de99198caf1..899437802aea 100644
--- a/include/linux/raid/bitmap.h
+++ b/include/linux/raid/bitmap.h
@@ -6,7 +6,13 @@
#ifndef BITMAP_H
#define BITMAP_H 1
-#define BITMAP_MAJOR 3
+#define BITMAP_MAJOR_LO 3
+/* version 4 insists the bitmap is in little-endian order
+ * with version 3, it is host-endian which is non-portable
+ */
+#define BITMAP_MAJOR_HI 4
+#define BITMAP_MAJOR_HOSTENDIAN 3
+
#define BITMAP_MINOR 39
/*
@@ -133,7 +139,8 @@ typedef __u16 bitmap_counter_t;
/* use these for bitmap->flags and bitmap->sb->state bit-fields */
enum bitmap_state {
BITMAP_ACTIVE = 0x001, /* the bitmap is in use */
- BITMAP_STALE = 0x002 /* the bitmap file is out of date or had -EIO */
+ BITMAP_STALE = 0x002, /* the bitmap file is out of date or had -EIO */
+ BITMAP_HOSTENDIAN = 0x8000,
};
/* the superblock at the front of the bitmap file -- little endian */
diff --git a/include/linux/raid/md.h b/include/linux/raid/md.h
index ffa316ce4dc8..91467a3c4a52 100644
--- a/include/linux/raid/md.h
+++ b/include/linux/raid/md.h
@@ -66,8 +66,10 @@
* and major_version/minor_version accordingly
* >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
* in the super status byte
+ * >=3 means that bitmap superblock version 4 is supported, which uses
+ * little-ending representation rather than host-endian
*/
-#define MD_PATCHLEVEL_VERSION 2
+#define MD_PATCHLEVEL_VERSION 3
extern int register_md_personality (int p_num, mdk_personality_t *p);
extern int unregister_md_personality (int p_num);