f15aca728c
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3540 42af7a65-404d-4744-a932-0658087f49c3
148 lines
4.8 KiB
C
148 lines
4.8 KiB
C
/****************************************************************************
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* fs/nxffs/nxffs_write.c
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* References: Linux/Documentation/filesystems/romfs.txt
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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 <string.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/fs.h>
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#include <nuttx/mtd.h>
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#include "nxffs.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Types
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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: nxffs_write
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*
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* Description:
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* This is an implementation of the NuttX standard file system write
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* method.
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*
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****************************************************************************/
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ssize_t nxffs_write(FAR struct file *filep, FAR const char *buffer, size_t buflen)
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{
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FAR struct nxffs_volume_s *volume;
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FAR struct nxffs_wrfile_s *wrfile;
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ssize_t ret;
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fvdbg("Write %d bytes to offset %d\n", buflen, filep->f_pos);
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/* Sanity checks */
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DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
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/* Recover the open file state from the struct file instance */
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wrfile = (FAR struct nxffs_wrfile_s *)filep->f_priv;
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/* Recover the volume state from the open file */
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volume = (FAR struct nxffs_volume_s *)filep->f_inode->i_private;
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DEBUGASSERT(volume != NULL);
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/* Get exclusive access to the volume. Note that the volume exclsem
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* protects the open file list.
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*/
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ret = sem_wait(&volume->exclsem);
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if (ret != OK)
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{
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ret = -errno;
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fdbg("sem_wait failed: %d\n", ret);
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goto errout;
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}
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/* Check if the file was opened with write access */
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#ifdef CONFIG_DEBUG
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if ((wrfile->ofile.mode & O_WROK) == 0)
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{
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fdbg("File not open for write access\n");
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ret = -EACCES;
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goto errout_with_semaphore;
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}
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#endif
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/* Seek to the current file offset */
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nxffs_ioseek(volume, wrfile->dathdr + wrfile->wrlen);
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/* Write data to that file offset */
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ret = nxffs_wrdata(volume, (FAR const uint8_t*)buffer, buflen);
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if (ret > 0)
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{
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/* Update the file offset */
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filep->f_pos += ret;
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}
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#warning "Add check for block full"
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errout_with_semaphore:
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sem_post(&volume->exclsem);
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errout:
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return ret;
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}
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