From 50af94b14c98f5769860a282a397c6f3b135c8a8 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] ocfs2: Add backup superblock info to ocfs2_fs.h
This synchronizes us with recent ocfs2-tools changes.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
---
fs/ocfs2/ocfs2_fs.h | 43 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index b5c68567077ec..c99e9058c1988 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/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__ */
--
2.30.2