基于Linux的模拟文件系统的设计实现

1、中北大学操作系统课程设计说明书学院、系：软件学院专 业：软件工程学生姓名： 戴国鹏 学号： 1121011532设计题目： 基于Linux的模拟文件系统的设计与实现起迄日期：2013年11月22日-2013年12月6日指导教师：李玉蓉2013年12月6日1 .需求分析（1）设计目的:模拟文文件管理是操作系统的重要功能之一。用高级语言编写和调试一个简单的文件系统, 件管理的工作过程。从而加深学生对文件系统内部功能和内部实现的理解和认识。（2）基本功能：主要包括：改变目录（CD,创建目录（MD,显示目录（DIR）,删除目录（RD,打开全部 文件（openall ），打开单个文件（open）,建立一

2、个文件（create ）,删除一个文件（delete ）, 写文件（write ）,读文件（read）,改文件的保护码（change）,退出（exit ）等。（3）设计要求：设计一个10个用户的文件系统。每个用户最多可以保存10个文件，一次运行用户可打开多个文件。程序采用二级文件目录。（即设置主目录（MFD和用户文件目录（UFD）。另外，可打开文件设置指针。为了方便实现，对文件的读写作了简化。在执行读写命令时，只需改读写指针。并不进行实际的读写操作。2 .总体设计2.1 数据结构struck filechar name10;int code;/保护码int size;char pwrite;/

3、读写指针;struct userchar name10;struct file *list;目录指针;2.2 主要函数声明void running。；void delet（）;void write（）;void open（）;Word资料void close();void bye();void read();void create();void input();2.3模块结构图Main函数0岩鸟.一3 .详细设计3.1 模块及功能说明3.1.1 input() 模块功能：进入文件系统。3.1.2 running。模块功能：选择相应的操作。3.1.3 bye()模块功能：退出文件系统函数 bye

4、()。3.1.4 create()模块功能：创建文件。3.1.5 open()模块功能：打开文件。3.1.6 close()模块功能：关闭文件。3.1.7 write()模块功能：写文件(需要先打开文件)。3.1.8 read() 模块功能：读文件(需要先打开文件)。3.1.9 9 delet()模块功能：删除文件。3.2 模块代码3.2.1 main()模块int main() input()；running。；return 0;3.2.2 input()模块void input() char name;int i;printf("n*n");*(input digita

5、lprintf(" Please choose the following usernamen");printf("1.one 2.two 3.three 4.four 5.fine 6.six 7.seven 8.eigh9.nine 0.ten n");printf(”*nn");printf("Please input username:");scanf("%s",&name); switch(name) case'1':for(i=0;i<10;i+)UFDi=one

6、i;MFD0=use1;running();break; case'2':for(i=0;i<10;i+)UFDi=twoi;MFD0=use1;running();break; case'3':for(i=0;i<10;i+)UFDi=threei;MFD0=use2;running();break; case'4':for(i=0;i<10;i+)UFDi=fouri;MFD0=use3;running();break; case'5':for(i=0;i<10;i+)UFDi=finei;MFD0=u

7、se4;running();break; case'6':for(i=0;i<10;i+)UFDi=sixi;MFD0=use5;running();break; case'7':for(i=0;i<10;i+)UFDi=seveni;MFD0=use6;running();break; case'8':for(i=0;i<10;i+)UFDi=eighti;MFD0=use7;running();break; case'9':for(i=0;i<10;i+)UFDi=ninei;MFD0=use8;run

8、ning();break; case'0':for(i=0;i<10;i+)UFDi=teni;MFD0=use9;running();break; default : printf("Enter the user name wrong!n"); input(); 3.2.3 running。 模块 void running。 char order;int i;printf("n*n")；printf("The user all the files below: n");for(i=0;i<10;i+)pr

9、intf("%s",UFD);printf("t");printf("n*n");printf(Choose option(input code ) : n");printf("c-create d-delete o-open s-close r-read w-write b-bye t.exit R Re-election user ) n");printf("n*n");printf("Input commandin');scanf("%s&

10、quot;,&order);switch(order) case 'c' : create();break;case 'd' :delet();break;case 'o' :open();break;case 's' :close();break;case 'r' :read();break;case 'w' :write();break;case 'b' :bye();break;case 't' : input();break;default : pri

11、ntf("Input error!nn");running。;4 .心得体会操作系统是计算机科学与技术专业中的一门重要基础课，目的是让我们了解操作系统的基本概念，理解计算机系统的资源如何组织，操作系统如何有效地管理这些系统资源，用户如何通过操作系统与计算机系统打交道。通过课程设计，可以进一步理解在计算机系统上运行的其它各类操作系统，并懂得在操作系统的支持下建立自己的应用系统。 操作系统课程设计， 对于训练我们掌握程序设计、 熟 悉上机操作和程序调试技术都有重要作用。 重点培养我们的思维能力、创新能力和排错能力。通过课程设计，进一步融会贯通教材内容，掌握程序各功能模块的工作原

12、理，相互联系和来龙去脉，完整地建立系统的概念。激发我的学习热情和主动性，培养我的独立工作能力， 在实践活动中，将所学知识综合运用，增长才干，并积累经验。对编程语言又有了更深一层次的认识，并对编程能力有所加强， 但还是很多的不足有待改进， 对于编程来说还需要大量 的实践，才能在发现问题和解决问题中前进与提高。5 .附录：源代码#include <stdlib.h>#include <stdio.h>#include <string.h>#define NULL 0int count=0;struct filechar name10;int code;int s

13、ize;char pwrite;struct userchar name10;struct file *list;struct file one10="a1",0,10,0,"a2”210,0,"a3”,1,10,0,"a4",2,10,0,"a5”,2,10,0,"a6”,2,10,0,"a7”,1,10,0,"0",0,0,0, "0",0,0,0,"0",0,0,0;struct file two10="b1",0,10

14、,0,"b2",2,10,0,"b3",1,10,0,"b4”210,0,"b5”210,0,"b6”210,0,"b7”210,0,"0",0,0,0, "0",0,0,0,"0",0,0,0;struct file three10="c1",0,10,0,"c2”210,0,"c3”,1,10,0, "c4",2,10,0,"c5",2,10,0,"c6"

15、;,2,10,0,"c7",1,10,0,"0",0,0,0, "0",0,0,0,"0",0,0,0;struct file four10="d1",0,10,0,"d2",2,10,0,"d3",1,10,0, "d4",2,10,0,"d5",2,10,0,"d6",2,10,0,"d7",1,10,0,"0",0,0,0, "0"

16、,0,0,0,"0",0,0,0;struct file fine10="e1",0,10,0,"e2",2,10,0,"e3",1,10,0,"e4",2,10,0,"e5”,2,10,0,"e6”,2,10,0,"e7”,1,10,0,"0",0,0,0, "0",0,0,0,"0",0,0,0;struct file six10="f1",0,10,0,"f2"

17、,2,10,0,"f3",1,10,0,"f4",2,10,0,"f5",2,10,0,"f6",2,10,0,"f7",1,10,0,"0",0,0,0,"0",0,0,0,"0",0,0,0;struct file seven10="g1",0,10,0,"g2",2,10,0,"g3",1,10,0, "g4"210,0"g5"21

18、0,0"g6"210,0"g7",1,10,0,"0",0,0,0, "0",0,0,0,"0",0,0,0;struct file eight10="h1",0,10,0,"h2",2,10,0,"h3",1,10,0, "h4",2,10,0,"h5",2,10,0,"h6",2,10,0,"h7",1,10,0,"0",0,0,0,

19、 "0",0,0,0,"0",0,0,0;struct file nine10="j1",0,10,0,"j2",2,10,0,"j3",1,10,0,"j4",2,10,0,"j5",2,10,0,"j6",2,10,0,"j7",1,10,0,"0",0,0,0,"0",0,0,0,"0",0,0,0;struct file ten10="k1

20、",0,10,0,"k2",2,10,0,"k3",1,10,0,"k4",2,10,0,"k5",2,10,0,"k6",2,10,0,"k7",1,10,0,"0",0,0,0, "0",0,0,0,"0",0,0,0;struct file UFD10;filestructAFD5="0",0,0,0,"0",0,0,0,"0",0,0,0,

21、"0",0,0,0,"0",0,0,0;userstruct use10="number1",one,"number2",two,"number3",three,"number4",four,"number5",fine,"number6",six,"number7",seven,"number8",eight,"number9",nine,"number10&quo

22、t;,ten;struct user MFD1="0",0;void running。；void delet();void write();void open();void close();void bye();void read();void create。;void input();int main() input();running。；return 0;void running() char order;int i;*n，)；printf("The user all the files below:n");for(i=0;i<10;i+)pr

23、intf("%s",UFD);printf("t");printf("n*n");printf(printf("nChoose option<input code>: n");printf("c-create d-delete o-open s-close r-read w-write b-bye t.exit<Re-election user> n");*n");printf("Input command:n");scanf(&

24、quot;%s",&order);switch(order) case 'c' : create();break;case 'd' :delet();break;case 'o' :open();break;case 's' :close();break;case 'r' :read();break;case 'w' :write();break;case 'b' :bye();break;case 't' :input();break;defaul

25、t :printf("Input error!nn");running();void delet() char name10;int i,flag;do printf("Input file name: nn");scanf("%s",&name);flag=0;for(i=0;i<10;i+) if(strcmp(UFD,name)flag=1;else flag=0;strcpy(UFD,"0");UFDi.code=0;UFDi.pwrite=0;UFDi.size=0;

26、printf("Delete success!n");break;Word资料if(flag=1)printf("Without this file,please enter again!n");while(flag=1);printf("n");running。；void open() char name10;int i,j,flag；if(count=5) printf("Run queue is full!n");running。；else do printf("Input file name:n&

27、quot;);scanf("%s",&name);flag=0;for(i=0;i<10;i+) if(strcmp(UFD,name)flag=1;else flag=0;break;Word资料if(flag=1)printf("Without this file,please enter again!n");while(flag=1);for(j=0;j<5;j+) if(strcmp(AFD,name)flag=1；else flag=0;break;if(flag=1)for(j=0;j<5;j

28、+) if(!strcmp(AFD,"0") AFDj=UFDi;printf("The file has been opend!n");count+;break;elseprintf("The file has been opended in the queue!nn");running。；void close() char name10;int j,flag;printf("Input file name: n");scanf("%s",&name);flag=0;for

29、(j=0;j<5;j+) if(strcmp(AFD,name) flag=1; else flag=0;strcpy(AFD,"0");AFDj.code=0;AFDj.pwrite=0;AFDj.size=0;printf("The file has been closed in the run queue!n"); break;if(flag=1)operateprintf("Runqueue without the open file ,pleaseagain!nn");running。；void

30、 bye() int i,j；for(i=0;i<5;i+) for(j=0;j<10;j+) if(!strcmp(AFD,UFD) UFDi=AFDi;break;printf("The saved file directory!n");printf("End of the operation。")；exit(0);void read() char name10;int j,flag=0;printf("Input file name: n");scanf("%s",&

31、;name);for(j=0;j<5;j+)if(!strcmp(AFD,name) flag=1; break;if(flag=1)if(AFDj.code=0|AFDj.code=2) AFDj.pwrite='R'printf("The state of the files are read!n");else printf("No permission to write this file!n"); elsefileprintf("Run queue without this file,please op

32、en thefirst!n");printf("n"); running。；void write() char name10;int j,flag=0;printf("Input file name: n");scanf("%s",&name);for(j=0;j<5;j+)if(!strcmp(AFD,name) flag=1; break;if(flag=1)if(AFDj.code=1|AFDj.code=2) AFDj.pwrite=W;printf("The state of t

33、he files are write!n");else printf("No permission to write this file!n"); elseprintf("Run queue without this file,please open the filefirst!n");printf("n");running。； void create。 char name10;int i,j=0,flag;for(i=0;i<10;i+) if(!strcmp(UFD,"0") j+;

34、if(j>9) printf("The folder is full,please delete!n"); running。； else do printf("Input file name; n");scanf("%s",&name);flag=0;for(i=0;i<10;i+)Word资料 if(!strcmp(UFD,name) printf("File name duplication,please enter again!n");flag=1；break;while(fl

35、ag=1);for(i=0;i<10;i+) if(!strcmp(UFD,"0") strcpy(UFD,name);doprintf("Please enter the protected codechoose0-2,0-Read1-Write 2-Read or Write:n");scanf("%d”,&UFDi.code);if(UFDi.code!=0&&UFDi.code!=1&&UFDi.code!=2)printf("Inputerror,input protection code again!n");while(UFDi.code!=0&&UFDi.code!=1&&UFDi.code!=2);printf("Please enter the file sizechoose the digital:n");scanf("%d”,&UFDi.size);printf("The file has been established!");