134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
/****************************************************************************
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* drivers/bch/bchlib_cache.c
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*
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* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 <stdbool.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/fs.h>
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#include "bch_internal.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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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: bchlib_flushsector
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*
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* Description:
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* Flush the current contents of the sector buffer (if dirty)
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*
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* Assumptions:
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* Caller must assume mutual exclusion
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*
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****************************************************************************/
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int bchlib_flushsector(FAR struct bchlib_s *bch)
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{
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FAR struct inode *inode;
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ssize_t ret = OK;
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if (bch->dirty)
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{
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inode = bch->inode;
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ret = inode->u.i_bops->write(inode, bch->buffer, bch->sector, 1);
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if (ret < 0)
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{
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fdbg("Write failed: %d\n");
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}
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bch->dirty = false;
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}
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return (int)ret;
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}
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/****************************************************************************
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* Name: bchlib_readsector
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*
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* Description:
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* Flush the current contents of the sector buffer (if dirty)
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*
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* Assumptions:
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* Caller must assume mutual exclusion
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*
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****************************************************************************/
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int bchlib_readsector(FAR struct bchlib_s *bch, size_t sector)
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{
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FAR struct inode *inode;
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ssize_t ret = OK;
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if (bch->sector != sector)
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{
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inode = bch->inode;
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(void)bchlib_flushsector(bch);
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bch->sector = (size_t)-1;
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ret = inode->u.i_bops->read(inode, bch->buffer, sector, 1);
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if (ret < 0)
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{
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fdbg("Read failed: %d\n");
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}
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bch->sector = sector;
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}
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return (int)ret;
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}
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