/****************************************************************************
 * fs/vfs/fs_fsync.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 "vfs_config.h"

#include "unistd.h"
#include "fcntl.h"
#include "errno.h"
#include "assert.h"



#include "vnode.h"

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

/****************************************************************************
 * Name: file_fsync
 *
 * Description:
 *   Equivalent to the standard fsync() function except that is accepts a
 *   struct file instance instead of a file descriptor and it does not set
 *   the errno variable.
 *
 ****************************************************************************/

int file_fsync(struct file *filep)
{
  int ret;

  /* Was this file opened for write access? */

  if ((filep->f_oflags & O_ACCMODE) == 0)
    {
      ret = EBADF;
      goto errout;
    }

  /* Is this vnode a registered mountpoint? Does it support the
   * sync operations may be relevant to device drivers but only
   * the mountpoint operations vtable contains a sync method.
   */

  if (!filep || !filep->ops || !filep->ops->fsync)
    {
      ret = EINVAL;
      goto errout;
    }

  /* Yes, then tell the mountpoint to sync this file */

  ret = filep->ops->fsync(filep);
  if (ret >= 0)
    {
      return OK;
    }

  ret = -ret;

errout:
  set_errno(ret);
  return VFS_ERROR;
}

/****************************************************************************
 * Name: fsync
 *
 * Description:
 *   This func simply binds vnode sync methods to the sync system call.
 *
 ****************************************************************************/

int fsync(int fd)
{
  struct file *filep = NULL;

  /* Get the file structure corresponding to the file descriptor. */

  int ret = fs_getfilep(fd, &filep);
  if (ret < 0)
    {
      /* The errno value has already been set */
      return VFS_ERROR;
    }

  /* Perform the fsync operation */

  return file_fsync(filep);
}