/****************************************************************************
 * fs/inode/fs_inode.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/fs/fs.h>
#include <nuttx/rwsem.h>

#include "inode/inode.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

static rw_semaphore_t g_inode_lock = RWSEM_INITIALIZER;

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: inode_initialize
 *
 * Description:
 *   This is called from the OS initialization logic to configure the file
 *   system.
 *
 ****************************************************************************/

void inode_initialize(void)
{
  /* Reserve the root node */

  inode_root_reserve();
}

/****************************************************************************
 * Name: inode_lock
 *
 * Description:
 *   Get writeable exclusive access to the in-memory inode tree.
 *
 ****************************************************************************/

void inode_lock(void)
{
  down_write(&g_inode_lock);
}

/****************************************************************************
 * Name: inode_rlock
 *
 * Description:
 *   Get readable exclusive access to the in-memory inode tree.
 *
 ****************************************************************************/

void inode_rlock(void)
{
  down_read(&g_inode_lock);
}

/****************************************************************************
 * Name: inode_unlock
 *
 * Description:
 *   Relinquish writeable exclusive access to the in-memory inode tree.
 *
 ****************************************************************************/

void inode_unlock(void)
{
  up_write(&g_inode_lock);
}

/****************************************************************************
 * Name: inode_runlock
 *
 * Description:
 *   Relinquish read exclusive access to the in-memory inode tree.
 *
 ****************************************************************************/

void inode_runlock(void)
{
  up_read(&g_inode_lock);
}