px4-firmware/nuttx/drivers/bch/bchlib_cache.c

134 lines
4.4 KiB
C

/****************************************************************************
* drivers/bch/bchlib_cache.c
*
* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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;
}