预留空间的TFFS文件系统

本文介绍如何在VxWorks中通过编写format函数实现TrueFFS的格式化,并介绍了使用网络下载方式启动VxWorks进行格式化的方法及基于dosFs的TFFS文件系统的创建。

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参照《VxWorks Kernel Programmer's Guide》 TrueFFS章节

1.在sysTffs.c中编写format函数如:sysTffsFormatC

  

在config.h中定义#define HALF_FORMAT

params的具体定义在tffsDrv.h文件中。第1个参数是保留的空间大小。

 

2.用网络下载的方式启动VxW。在shell里输入该函数格式化flash。重启以自动加载flash driver(自动加载需要定义INCLUDE_TFFS_MOUNT)或输入usrTffsConfig加载。

 

3.输入dosFsVolFormat ("/tffs0/", 0, 0),就实现了基于dosFs的TFFS文件系统。

 

Table of Contents 1 Introduction ...................................................................................................... 4 1.1 Scope ................................................................................................................... 4 1.2 Background ......................................................................................................... 4 1.3 Overview ............................................................................................................. 4 1.4 Implemented File Functionality ......................................................................... 5 1.4.1 Basic ............................................................................................................................... 5 1.4.2 Access Attributes ............................................................................................................ 5 1.4.3 Protective Mode .............................................................................................................. 7 1.4.4 Access Monitor ............................................................................................................... 7 1.5 Disk Usage Saturation ........................................................................................ 7 2 Application Programming Interfaces (APIs) .................................................. 9 2.1 The TFFS Protection Application Programming Interface (TP-API) ................ 9 2.1.1 TFFS Usage Protection .................................................................................................. 9 2.1.1.1 Pseudo Code Example .......................................................................................... 9 2.1.1.2 Posix Code Example ............................................................................................ 10 2.1.1.3 sig_semRead ....................................................................................................... 11 2.1.1.4 sig_semWrite ....................................................................................................... 11 2.1.1.5 wai_semRead ...................................................................................................... 11 2.1.1.6 wai_semWrite....................................................................................................... 11 2.1.2 Protective Mode Application Programming Interface ................................................... 11 2.1.3 Monitor Protection Application Programming Interface ................................................ 11 2.2 The TFFS User Application Programming Interface (TU-API) ....................... 13 2.2.1 tffsChange .................................................................................................................... 13 2.2.2 tffsChdir ........................................................................................................................ 14 2.2.3 tffsClearerr .................................................................................................................... 14 2.2.4 tffsDelete ....................................................................................................................... 15 2.2.5 tffsDiagMode ................................................................................................................. 15 2.2.6 tffsExists ....................................................................................................................... 16 2.2.7 tffsFclose ...................................................................................................................... 16 2.2.8 tffsFeof .......................................................................................................................... 17 2.2.9 tffsFerror ....................................................................................................................... 17 2.2.10 tffsFflush ....................................................................................................................... 17 2.2.11 tffsFopen ....................................................................................................................... 18 2.2.12 tffsFormat ...................................................................................................................... 19 2.2.13 tffsFread ........................................................................................................................ 20 2.2.14 tffsFseek ....................................................................................................................... 20 2.2.15 tffsFwrite ....................................................................................................................... 21 2.2.16 tffsGetBlockInfo ............................................................................................................ 21 2.2.17 tffsGetPath .................................................................................................................... 22 2.2.18 tffsGetRoot .................................................................................................................... 22 2.2.19 tffsInit ............................................................................................................................ 22 2.2.20 tffsLsdir ......................................................................................................................... 23 2.2.21 tffsMkdir ........................................................................................................................ 24 2.2.22 tffsMonitorAdd ............................................................................................................... 25 2.2.23 tffsMonitorRemove ........................................................................................................ 26 2.2.24 tffsMount ....................................................................................................................... 27 2.2.25 tffsReclaim .................................................................................................................... 28 2.2.26 tffsResize ...................................................................................................................... 29 2.2.27 tffsRewind ..................................................................................................................... 29 2.2.28 tffsTruncate ................................................................................................................... 30 2.2.29 tffsUnmount .................................................................................................................. 30
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