forked from Archive/PX4-Autopilot
134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
/****************************************************************************
|
|
* drivers/bch/bchlib_cache.c
|
|
*
|
|
* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* 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.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <stdbool.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/fs/fs.h>
|
|
|
|
#include "bch_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: bchlib_flushsector
|
|
*
|
|
* Description:
|
|
* Flush the current contents of the sector buffer (if dirty)
|
|
*
|
|
* Assumptions:
|
|
* Caller must assume mutual exclusion
|
|
*
|
|
****************************************************************************/
|
|
|
|
int bchlib_flushsector(FAR struct bchlib_s *bch)
|
|
{
|
|
FAR struct inode *inode;
|
|
ssize_t ret = OK;
|
|
|
|
if (bch->dirty)
|
|
{
|
|
inode = bch->inode;
|
|
ret = inode->u.i_bops->write(inode, bch->buffer, bch->sector, 1);
|
|
if (ret < 0)
|
|
{
|
|
fdbg("Write failed: %d\n");
|
|
}
|
|
bch->dirty = false;
|
|
}
|
|
return (int)ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: bchlib_readsector
|
|
*
|
|
* Description:
|
|
* Flush the current contents of the sector buffer (if dirty)
|
|
*
|
|
* Assumptions:
|
|
* Caller must assume mutual exclusion
|
|
*
|
|
****************************************************************************/
|
|
|
|
int bchlib_readsector(FAR struct bchlib_s *bch, size_t sector)
|
|
{
|
|
FAR struct inode *inode;
|
|
ssize_t ret = OK;
|
|
|
|
if (bch->sector != sector)
|
|
{
|
|
inode = bch->inode;
|
|
|
|
(void)bchlib_flushsector(bch);
|
|
bch->sector = (size_t)-1;
|
|
|
|
ret = inode->u.i_bops->read(inode, bch->buffer, sector, 1);
|
|
if (ret < 0)
|
|
{
|
|
fdbg("Read failed: %d\n");
|
|
}
|
|
bch->sector = sector;
|
|
}
|
|
return (int)ret;
|
|
}
|
|
|