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138 lines
4.4 KiB
138 lines
4.4 KiB
/**************************************************************************** |
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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 <gnutt@nuttx.org> |
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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/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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set_errno(ret); |
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return ERROR; |
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} |
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