138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
/****************************************************************************
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* fs/fs_fsync.c
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*
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* Copyright (C) 2007-2009 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 <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include <nuttx/sched.h>
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#include "fs_internal.h"
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/****************************************************************************
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* Pre-processor 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: fsync
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*
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* Description:
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* This func simply binds inode sync methods to the sync system call.
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*
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****************************************************************************/
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int fsync(int fd)
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{
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FAR struct filelist *list;
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FAR struct file *this_file;
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struct inode *inode;
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int ret;
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/* Get the thread-specific file list */
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list = sched_getfiles();
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if (!list)
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{
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ret = EMFILE;
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goto errout;
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}
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/* Did we get a valid file descriptor? */
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if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
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{
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ret = EBADF;
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goto errout;
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}
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/* Was this file opened for write access? */
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this_file = &list->fl_files[fd];
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if ((this_file->f_oflags & O_WROK) == 0)
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{
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ret = EBADF;
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goto errout;
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}
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/* Is this inode a registered mountpoint? Does it support the
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* sync operations may be relevant to device drivers but only
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* the mountpoint operations vtable contains a sync method.
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*/
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inode = this_file->f_inode;
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if (!inode || !INODE_IS_MOUNTPT(inode) ||
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!inode->u.i_mops || !inode->u.i_mops->sync)
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{
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ret = EINVAL;
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goto errout;
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}
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/* Yes, then tell the mountpoint to sync this file */
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ret = inode->u.i_mops->sync(this_file);
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if (ret >= 0)
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{
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return OK;
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}
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ret = -ret;
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errout:
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*get_errno_ptr() = ret;
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return ERROR;
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}
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