a05f9aaa85
since the driver can also support fsync by implementing BIOC_FLUSH Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/****************************************************************************
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* fs/vfs/fs_fsync.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <assert.h>
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#include <nuttx/sched.h>
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#include <nuttx/cancelpt.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/fs/ioctl.h>
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#include "inode/inode.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: file_fsync
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*
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* Description:
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* Equivalent to the standard fsync() function except that is accepts a
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* struct file instance instead of a file descriptor and it does not set
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* the errno variable.
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*
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****************************************************************************/
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int file_fsync(FAR struct file *filep)
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{
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FAR struct inode *inode;
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int ret;
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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 = filep->f_inode;
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if (inode != NULL)
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{
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#ifndef CONFIG_DISABLE_MOUNTPOINT
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if (INODE_IS_MOUNTPT(inode) && inode->u.i_mops &&
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inode->u.i_mops->sync)
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{
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/* Yes, then tell the mountpoint to sync this file */
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return inode->u.i_mops->sync(filep);
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}
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else
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#endif
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if (inode->u.i_ops && inode->u.i_ops->ioctl)
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{
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ret = inode->u.i_ops->ioctl(filep, BIOC_FLUSH, 0);
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return ret >= 0 ? 0 : ret;
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}
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}
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return -EINVAL;
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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 file *filep;
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int ret;
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/* fsync() is a cancellation point */
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enter_cancellation_point();
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/* Get the file structure corresponding to the file descriptor. */
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ret = fs_getfilep(fd, &filep);
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if (ret < 0)
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{
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goto errout;
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}
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DEBUGASSERT(filep != NULL);
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/* Perform the fsync operation */
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ret = file_fsync(filep);
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if (ret < 0)
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{
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goto errout;
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}
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leave_cancellation_point();
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return ret;
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errout:
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leave_cancellation_point();
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set_errno(-ret);
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return ERROR;
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}
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