Imported reiserfsprogs-3.6.20

include/reiserfs/internal.h

@@ -0,0 +1,78 @@
+/*
+ *  Copyright 2000-2004 by Hans Reiser, licensing governed by 
+ *  reiserfsprogs/README
+ */
+
+#ifndef REISERFS_INTERNAL_H
+#define REISERFS_INTERNAL_H
+
+/*
+ * Picture represents an internal node of the reiserfs tree
+ *  ______________________________________________________
+ * |      |  Array of     |  Array of         |  Free     |
+ * |block |    keys       |  pointers         | space     |
+ * | head |      N        |      N+1          |           |
+ * |______|_______________|___________________|___________|
+ */
+
+
+/* Disk child pointer: The pointer from an internal node of the tree
+   to a node that is on disk. */
+struct reiserfs_dc {
+    __u32 dc2_block_number;              /* Disk child's block number. */
+    __u16 dc2_size;		            /* Disk child's used space.   */
+    __u16 dc2_reserved;
+} __attribute__ ((__packed__));
+
+typedef struct reiserfs_dc reiserfs_dc_t;
+
+#define REISERFS_DC_SIZE (sizeof(reiserfs_dc_t))
+
+/* set/get fields of disk_child with these defines */
+#define reiserfs_dc_get_nr(dc)		get_le32 (dc, dc2_block_number)
+#define reiserfs_dc_set_nr(dc,val)	set_le32 (dc, dc2_block_number, val)
+
+#define reiserfs_dc_get_size(dc)	get_le16 (dc, dc2_size)
+#define reiserfs_dc_set_size(dc,val)	set_le16 (dc, dc2_size, val)
+
+#define reiserfs_dc_init(dc, size, blocknr)				\
+({									\
+    reiserfs_dc_set_nr(dc, blocknr);					\
+    reiserfs_dc_set_size(dc, size);					\
+    set_le16(dc, dc2_reserved, 0);					\
+})
+
+/* max and min number of keys in internal node */
+#define REISERFS_INT_MAX(bh)	\
+	((REISERFS_NODE_SPACE(bh->b_size) - REISERFS_DC_SIZE) /		\
+	 (REISERFS_KEY_SIZE+REISERFS_DC_SIZE))
+
+#define REISERFS_INT_MIN(bh)	(REISERFS_INT_MAX(bh) / 2)
+
+/* get key */
+#define reiserfs_int_key_at(bh,item_num)				\
+	((reiserfs_key_t * )((bh)->b_data + REISERFS_NODEH_SIZE) +	\
+	 (item_num) )
+
+/* Get disk child by buffer header and position in the tree node. */
+#define reiserfs_int_at(p_s_bh,n_pos)					\
+	((reiserfs_dc_t *) ((p_s_bh)->b_data + REISERFS_NODEH_SIZE +	\
+			    reiserfs_node_items(p_s_bh) * REISERFS_KEY_SIZE +\
+			    REISERFS_DC_SIZE * (n_pos)))
+
+#define reiserfs_int_head(bh)						\
+	((reiserfs_nh_get_level (((reiserfs_node_head_t *)((bh)->b_data))) >	\
+	  LEAF_LEVEL) &&						\
+	 (reiserfs_nh_get_level (((reiserfs_node_head_t *)((bh)->b_data))) <=	\
+	  REISERFS_TREE_HEIGHT_MAX))
+
+extern int reiserfs_internal_correct (reiserfs_bh_t *bh);
+
+extern int reiserfs_internal_print (FILE * fp, 
+				    reiserfs_bh_t * bh, 
+				    int first, int last);
+
+extern int reiserfs_internal_get_pos (reiserfs_bh_t * bh, 
+				      unsigned long block);
+
+#endif