ocfs2: sparse b-tree support

[powerpc.git] / fs / ocfs2 / ocfs2_fs.h

diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 3330a5d..f010197 100644 (file)
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -85,8 +85,9 @@
 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask)                  \
        OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
 
-#define OCFS2_FEATURE_COMPAT_SUPP      0
-#define OCFS2_FEATURE_INCOMPAT_SUPP    0
+#define OCFS2_FEATURE_COMPAT_SUPP      OCFS2_FEATURE_COMPAT_BACKUP_SB
+#define OCFS2_FEATURE_INCOMPAT_SUPP    (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
+                                        | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
 #define OCFS2_FEATURE_RO_COMPAT_SUPP   0
 
 /*
@@ -96,6 +97,32 @@
  */
 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV   0x0002
 
+/*
+ * tunefs sets this incompat flag before starting the resize and clears it
+ * at the end. This flag protects users from inadvertently mounting the fs
+ * after an aborted run without fsck-ing.
+ */
+#define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG    0x0004
+
+/* Used to denote a non-clustered volume */
+#define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT     0x0008
+
+/* 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
@@ -285,7 +312,10 @@ struct ocfs2_extent_list {
 /*00*/ __le16 l_tree_depth;            /* Extent tree depth from this
                                           point.  0 means data extents
                                           hang directly off this
-                                          header (a leaf) */
+                                          header (a leaf)
+                                          NOTE: The high 8 bits cannot be
+                                          used - tree_depth is never that big.
+                                       */
        __le16 l_count;                 /* Number of extent records */
        __le16 l_next_free_rec;         /* Next unused extent slot */
        __le16 l_reserved1;
@@ -420,7 +450,9 @@ struct ocfs2_dinode {
        __le32 i_ctime_nsec;
        __le32 i_mtime_nsec;
        __le32 i_attr;
-       __le32 i_reserved1;
+       __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
+                                          was set in i_flags */
+       __le16 i_reserved1;
 /*70*/ __le64 i_reserved2[8];
 /*B8*/ union {
                __le64 i_pad1;          /* Generic way to refer to this
@@ -554,6 +586,20 @@ 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_bits;
+               return offset;
+       }
+
+       return 0;
+
+}
 #else
 static inline int ocfs2_fast_symlink_chars(int blocksize)
 {
@@ -619,6 +665,19 @@ 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__ */