From 17927372cf781093c33c5f9840af77cd87f47e5e Mon Sep 17 00:00:00 2001
From: Mark Fasheh <mark.fasheh@oracle.com>
Date: Sun, 21 Jan 2007 14:44:59 -0800
Subject: [PATCH] --- yaml --- r: 45599 b: refs/heads/master c:
 50af94b14c98f5769860a282a397c6f3b135c8a8 h: refs/heads/master i:   45597:
 f689a4d1e9d38a3a24a8812739ba53e2ca609c41   45595:
 ba67e778a8d36edfd693b3be51000aef240aee59   45591:
 e2acc14b65d3a30f334f842c939cc45077338654   45583:
 51fbdaadc3a782a7003c375b57e19469cac950b9   45567:
 7e365dd9da39b728c06fca40bcaba3b5cb47daf0 v: v3

---
 [refs]                    |  2 +-
 trunk/fs/ocfs2/ocfs2_fs.h | 43 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 20da42dd4c90..7d8232c90cf1 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6a1bd4a5788435b6ef1664383604b43607eb825a
+refs/heads/master: 50af94b14c98f5769860a282a397c6f3b135c8a8
diff --git a/trunk/fs/ocfs2/ocfs2_fs.h b/trunk/fs/ocfs2/ocfs2_fs.h
index b5c68567077e..c99e9058c198 100644
--- a/trunk/fs/ocfs2/ocfs2_fs.h
+++ b/trunk/fs/ocfs2/ocfs2_fs.h
@@ -85,7 +85,7 @@
 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask)			\
 	OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
 
-#define OCFS2_FEATURE_COMPAT_SUPP	0
+#define OCFS2_FEATURE_COMPAT_SUPP	OCFS2_FEATURE_COMPAT_BACKUP_SB
 #define OCFS2_FEATURE_INCOMPAT_SUPP	OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT
 #define OCFS2_FEATURE_RO_COMPAT_SUPP	0
 
@@ -109,6 +109,20 @@
 /* Support for sparse allocation in b-trees */
 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC	0x0010
 
+/*
+ * backup superblock flag is used to indicate that this volume
+ * has backup superblocks.
+ */
+#define OCFS2_FEATURE_COMPAT_BACKUP_SB		0x0001
+
+/* The byte offset of the first backup block will be 1G.
+ * The following will be 4G, 16G, 64G, 256G and 1T.
+ */
+#define OCFS2_BACKUP_SB_START			1 << 30
+
+/* the max backup superblock nums */
+#define OCFS2_MAX_BACKUP_SUPERBLOCKS	6
+
 /*
  * Flags on ocfs2_dinode.i_flags
  */
@@ -566,6 +580,20 @@ static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
 
 	return size / sizeof(struct ocfs2_truncate_rec);
 }
+
+static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
+{
+	u64 offset = OCFS2_BACKUP_SB_START;
+
+	if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
+		offset <<= (2 * index);
+		offset /= sb->s_blocksize;
+		return offset;
+	}
+
+	return 0;
+
+}
 #else
 static inline int ocfs2_fast_symlink_chars(int blocksize)
 {
@@ -631,6 +659,19 @@ static inline int ocfs2_truncate_recs_per_inode(int blocksize)
 
 	return size / sizeof(struct ocfs2_truncate_rec);
 }
+
+static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
+{
+	uint64_t offset = OCFS2_BACKUP_SB_START;
+
+	if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
+		offset <<= (2 * index);
+		offset /= blocksize;
+		return offset;
+	}
+
+	return 0;
+}
 #endif  /* __KERNEL__ */