--- /sys/ufs/ufs/inode.h	2008-01-16 01:37:55.000000000 +0300
+++ /sys/fs/bsdext2fs/inode.h	2008-02-25 22:48:07.000000000 +0300
@@ -32,12 +32,16 @@
  * SUCH DAMAGE.
  *
  *	@(#)inode.h	8.9 (Berkeley) 5/14/95
- * $FreeBSD: src/sys/ufs/ufs/inode.h,v 1.51 2006/10/10 09:20:54 kib Exp $
+ *
+ * From: src/sys/ufs/ufs/inode.h,v 1.51
+ *
+ * $FreeBSD$
  */
 
 #ifndef _UFS_UFS_INODE_H_
 #define	_UFS_UFS_INODE_H_
 
+#include <sys/file.h>
 #include <sys/lock.h>
 #include <sys/queue.h>
 #include <ufs/ufs/dinode.h>
@@ -48,6 +52,14 @@
 #define	doff_t		int32_t
 
 /*
+ * Per-filesystem inode extensions.
+ */
+struct ext2fs_inode_ext {
+	daddr_t ext2fs_last_lblk;	/* last logical block allocated */
+	daddr_t ext2fs_last_blk;	/* last block allocated on disk */
+};
+
+/*
  * The inode is used to describe each active (or recently active) file in the
  * UFS filesystem. It is composed of two types of information. The first part
  * is the information that is needed only while the file is active (such as
@@ -72,7 +84,13 @@
 	ino_t	  i_number;	/* The identity of the inode. */
 	int	  i_effnlink;	/* i_nlink when I/O completes */
 
-	struct	 fs *i_fs;	/* Associated filesystem superblock. */
+	union {
+		struct fs *fs;	/* FFS */
+		struct m_ext2fs *e2fs;	/* EXT2FS */
+	} inode_u;
+#define	i_fs	inode_u.fs
+#define i_e2fs	inode_u.e2fs
+
 	struct	 dquot *i_dquot[MAXQUOTAS]; /* Dquot structures. */
 	u_quad_t i_modrev;	/* Revision level for NFS lease. */
 	struct	 lockf *i_lockf;/* Head of byte-level lock list. */
@@ -89,7 +107,10 @@
 	union {
 		struct dirhash *dirhash; /* Hashing for large directories. */
 		daddr_t *snapblklist;    /* Collect expunged snapshot blocks. */
+		struct ext2fs_inode_ext e2fs;
 	} i_un;
+#define	i_e2fs_last_lblk	i_un.e2fs.ext2fs_last_lblk
+#define	i_e2fs_last_blk		i_un.e2fs.ext2fs_last_blk
 
 	/*
 	 * Data for extended attribute modification.
@@ -114,7 +135,40 @@
 	union {
 		struct ufs1_dinode *din1;	/* UFS1 on-disk dinode. */
 		struct ufs2_dinode *din2;	/* UFS2 on-disk dinode. */
+		struct ext2fs_dinode *e2fs_din; /* 128 bytes of the on-disk
+								dinode. */
 	} dinode_u;
+        /* misc data field for different tn_type node */
+        union {
+                /* Valid when tn_type == VBLK || tn_type == VCHR. */
+                dev_t                   tn_rdev;
+
+                /* Valid when tn_type == VLNK. */
+                /* The link's target, allocated from a string pool. */
+                char *                  tn_link;
+
+                /* Valid when tn_type == VREG. */
+                struct tn_reg {
+                        /* The contents of regular files stored in a tmpfs
+                         * file system are represented by a single anonymous
+                         * memory object (aobj, for short).  The aobj provides
+                         * direct access to any position within the file,
+                         * because its contents are always mapped in a   
+                         * contiguous region of virtual memory.  It is a task
+                         * of the memory management subsystem (see uvm(9)) to
+                         * issue the required page ins or page outs whenever 
+                         * a position within the file is accessed. */
+                        vm_object_t             tn_aobj;
+                        size_t                  tn_aobj_pages;
+
+                }tn_reg;
+
+                /* Valid when tn_type = VFIFO */
+                struct tn_fifo {
+                        fo_rdwr_t               *tn_fo_read;
+                        fo_rdwr_t               *tn_fo_write;
+                }tn_fifo;
+        }tn_spec;
 };
 /*
  * These flags are kept in i_flag.
@@ -135,6 +189,7 @@
 #define i_snapblklist i_un.snapblklist
 #define i_din1 dinode_u.din1
 #define i_din2 dinode_u.din2
+#define i_e2di dinode_u.e2fs_din
 
 #ifdef _KERNEL
 /*