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diff --git a/pfinet/linux-src/include/linux/umsdos_fs_i.h b/pfinet/linux-src/include/linux/umsdos_fs_i.h
new file mode 100644
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+++ b/pfinet/linux-src/include/linux/umsdos_fs_i.h
@@ -0,0 +1,75 @@
+#ifndef UMSDOS_FS_I_H
+#define UMSDOS_FS_I_H
+
+#ifndef _LINUX_TYPES_H
+#include <linux/types.h>
+#endif
+
+#include <linux/msdos_fs_i.h>
+#include <linux/pipe_fs_i.h>
+
+/* #Specification: strategy / in memory inode
+ * Here is the information specific to the inode of the UMSDOS file
+ * system. This information is added to the end of the standard struct
+ * inode. Each file system has its own extension to struct inode,
+ * so do the umsdos file system.
+ * 
+ * The strategy is to have the umsdos_inode_info as a superset of
+ * the msdos_inode_info, since most of the time the job is done
+ * by the msdos fs code.
+ * 
+ * So we duplicate the msdos_inode_info, and add our own info at the
+ * end.
+ * 
+ * For all file type (and directory) the inode has a reference to:
+ * the directory which hold this entry: i_dir_owner
+ * The EMD file of i_dir_owner: i_emd_owner
+ * The offset in this EMD file of the entry: pos
+ * 
+ * For directory, we also have a reference to the inode of its
+ * own EMD file. Also, we have dir_locking_info to help synchronise
+ * file creation and file lookup. This data is sharing space with
+ * the pipe_inode_info not used by directory. See also msdos_fs_i.h
+ * for more information about pipe_inode_info and msdos_inode_info.
+ * 
+ * Special file and fifo do have an inode which correspond to an
+ * empty MSDOS file.
+ * 
+ * symlink are processed mostly like regular file. The content is the
+ * link.
+ * 
+ * fifos add there own extension to the inode. I have reserved some
+ * space for fifos side by side with msdos_inode_info. This is just
+ * to for the show, because msdos_inode_info already include the
+ * pipe_inode_info.
+ * 
+ * The UMSDOS specific extension is placed after the union.
+ */
+
+struct dir_locking_info {
+	struct wait_queue *p;
+	short int looking;	/* How many process doing a lookup */
+	short int creating;	/* Is there any creation going on here
+				 *  Only one at a time, although one
+				 *  may recursively lock, so it is a counter
+				 */
+	long pid;		/* pid of the process owning the creation */
+	/* lock */
+};
+
+struct umsdos_inode_info {
+	union {
+		struct msdos_inode_info msdos_info;
+		struct pipe_inode_info pipe_info;
+		struct dir_locking_info dir_info;
+	} u;
+	int i_patched;			/* Inode has been patched */
+	int i_is_hlink;			/* Resolved hardlink inode? */
+	unsigned long i_emd_owner;	/* Is this the EMD file inode? */
+	off_t pos;			/* Entry offset in the emd_owner file */
+	/* The rest is used only if this inode describes a directory */
+	struct dentry *i_emd_dentry;	/* EMD dentry for this directory */
+	unsigned long i_emd_dir;	/* Inode of the EMD file */
+};
+
+#endif