1 files changed, 109 insertions, 0 deletions
diff --git a/include/rtems/fs.h b/include/rtems/fs.h
new file mode 100644
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+++ b/include/rtems/fs.h
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+/**
+ * @file rtems/fs.h
+ *
+ * @brief Basic Filesystem Types
+ *
+ * This file defines basic filesystem types
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-2011.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  Modifications to support reference counting in the file system are
+ *  Copyright (c) 2012 embedded brains GmbH.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _RTEMS_FS_H
+#define _RTEMS_FS_H
+
+#include <rtems/chain.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ *  File descriptor Table Information
+ */
+
+/* Forward declarations */
+
+/* FIXME: shouldn't this better not be here? */
+typedef struct rtems_libio_tt rtems_libio_t;
+
+struct rtems_filesystem_mount_table_entry_tt;
+typedef struct rtems_filesystem_mount_table_entry_tt
+    rtems_filesystem_mount_table_entry_t;
+
+typedef struct _rtems_filesystem_file_handlers_r
+    rtems_filesystem_file_handlers_r;
+typedef struct _rtems_filesystem_operations_table
+    rtems_filesystem_operations_table;
+
+/**
+ * @brief File system location.
+ *
+ * @ingroup LibIO
+ */
+typedef struct rtems_filesystem_location_info_tt {
+   rtems_chain_node                         mt_entry_node;
+   void                                    *node_access;
+   void                                    *node_access_2;
+   const rtems_filesystem_file_handlers_r  *handlers;
+   rtems_filesystem_mount_table_entry_t    *mt_entry;
+} rtems_filesystem_location_info_t;
+
+/**
+ * @brief Global file system location.
+ *
+ * @ingroup LibIO
+ *
+ * The global file system locations are used for
+ * - the mount point location in the mount table entry,
+ * - the file system root location in the mount table entry,
+ * - the root directory location in the user environment, and
+ * - the current directory location in the user environment.
+ *
+ * During the path evaluation global start locations are obtained to ensure
+ * that the current file system will be not unmounted in the meantime.
+ *
+ * To support a release within critical sections of the operating system a
+ * deferred release is supported.  This is similar to malloc() and free().
+ *
+ * @see rtems_filesystem_global_location_obtain() and
+ * rtems_filesystem_global_location_release().
+ */
+typedef struct rtems_filesystem_global_location_t {
+  rtems_filesystem_location_info_t location;
+  int reference_count;
+
+  /**
+   * A release within a critical section of the operating system will add this
+   * location to a list of deferred released locations.  This list is processed
+   * in the next rtems_filesystem_global_location_obtain() in FIFO order.
+   */
+  struct rtems_filesystem_global_location_t *deferred_released_next;
+
+  /**
+   * A release within a critical section can happen multiple times.  This field
+   * counts the deferred releases.
+   */
+  int deferred_released_count;
+} rtems_filesystem_global_location_t;
+
+/*
+ * Return the mount table entry for a path location.
+ */
+#define rtems_filesystem_location_mount(_pl) ((_pl)->mt_entry)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+/* end of include file */