forked from Archive/PX4-Autopilot
122 lines
4.6 KiB
C
122 lines
4.6 KiB
C
/****************************************************************************
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* fs/fs_registerblockdriver.c
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*
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* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#include "fs_internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: register_driver
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*
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* Description:
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* Register a block driver inode the pseudo file system.
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*
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* Input parameters:
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* path - The path to the inode to create
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* bops - The block driver operations structure
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* mode - inmode priviledges (not used)
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* priv - Private, user data that will be associated with the inode.
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*
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* Returned Value:
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* Zero on success (with the inode point in 'inode'); A negated errno
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* value is returned on a failure (all error values returned by
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* inode_reserve):
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*
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* EINVAL - 'path' is invalid for this operation
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* EEXIST - An inode already exists at 'path'
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* ENOMEM - Failed to allocate in-memory resources for the operation
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*
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****************************************************************************/
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int register_blockdriver(FAR const char *path,
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FAR const struct block_operations *bops,
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mode_t mode, FAR void *priv)
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{
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FAR struct inode *node;
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int ret;
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/* Insert an inode for the device driver -- we need to hold the inode
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* semaphore to prevent access to the tree while we this. This is because
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* we will have a momentarily bad true until we populate the inode with
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* valid data.
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*/
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inode_semtake();
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ret = inode_reserve(path, &node);
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if (ret >= 0)
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{
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/* We have it, now populate it with block driver specific information. */
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INODE_SET_BLOCK(node);
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node->u.i_bops = bops;
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#ifdef CONFIG_FILE_MODE
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node->i_mode = mode;
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#endif
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node->i_private = priv;
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ret = OK;
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}
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inode_semgive();
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return ret;
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}
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