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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @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 & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#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 */
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