--- /dev/null
+/*
+ * Interface constants and typedefs shared between kernel/user space
+ * Copyright (c) 2003, Jeffrey K. Hollingsworth <hollings@cs.umd.edu>
+ * Copyright (c) 2004, David H. Hovemeyer <daveho@cs.umd.edu>
+ * $Revision: 1.1 $
+ *
+ * This is free software. You are permitted to use,
+ * redistribute, and modify it as specified in the file "COPYING".
+ */
+
+#ifndef GEEKOS_FILEIO_H
+#define GEEKOS_FILEIO_H
+
+#include <stddef.h>
+#include <geekos/ktypes.h>
+
+/* Maximum name of a path. */
+#define VFS_MAX_PATH_LEN 1023
+
+/* Maximum length of the name of a filesystem type: e.g., "pfat", "gosfs", etc. */
+#define VFS_MAX_FS_NAME_LEN 15
+
+/* Maximum number of ACL entries in a directory entry. */
+#define VFS_MAX_ACL_ENTRIES 10
+
+/* We assume that all block devices have 512 byte sectors. */
+#define SECTOR_SIZE 512
+
+/* Maximum length for the name of a block device, e.g. "ide0". */
+#define BLOCKDEV_MAX_NAME_LEN 15
+
+/*
+ * File permissions.
+ * These are used as flags for Open() VFS function.
+ * O_READ and O_WRITE are also used in the permissions
+ * field of struct VFS_ACL_Entry.
+ */
+#define O_CREATE 0x1 /* Create the file if it doesn't exist. */
+#define O_READ 0x2 /* Open file for reading. */
+#define O_WRITE 0x4 /* Open file for writing. */
+#define O_EXCL 0x8 /* Don't create file if it already exists. */
+
+/*
+ * An entry in an Access Control List (ACL).
+ * Represents a set of permissions for a particular user id.
+ */
+struct VFS_ACL_Entry {
+ uint_t uid:28;
+ uint_t permission:4;
+};
+
+/*
+ * Generic structure representing the metadata for a directory entry.
+ * This is filled in by the Stat() and FStat() VFS functions.
+ */
+struct VFS_File_Stat {
+ int size;
+ int isDirectory:1;
+ int isSetuid:1;
+ struct VFS_ACL_Entry acls[VFS_MAX_ACL_ENTRIES];
+};
+
+/*
+ * Generic directory entry structure.
+ * This is filled in by the Read_Entry() VFS function.
+ */
+struct VFS_Dir_Entry {
+ char name[1024];
+ struct VFS_File_Stat stats;
+};
+
+/*
+ * A request to mount a filesystem.
+ * This is passed as a struct because it would require too many registers
+ * to pass all of the information in registers.
+ */
+struct VFS_Mount_Request {
+ char devname[BLOCKDEV_MAX_NAME_LEN+1];/* Name of block device: e.g., "ide1". */
+ char prefix[VFS_MAX_PATH_LEN+1]; /* Directory prefix to mount on: e.g., "/d". */
+ char fstype[VFS_MAX_FS_NAME_LEN+1]; /* Filesystem type: e.g., "gosfs". */
+};
+
+#endif
