基于Linux的模擬文件系統(tǒng)的設計實現(xiàn)

1、中北大學操作系統(tǒng)課程設計說明書學院、系：軟件學院專 業(yè)：軟件工程學生姓名： 戴國鵬 學號： 1121011532設計題目： 基于Linux的模擬文件系統(tǒng)的設計與實現(xiàn)起迄日期：2013年11月22日-2013年12月6日指導教師：李玉蓉2013年12月6日1 .需求分析（1）設計目的:模擬文文件管理是操作系統(tǒng)的重要功能之一。用高級語言編寫和調試一個簡單的文件系統(tǒng), 件管理的工作過程。從而加深學生對文件系統(tǒng)內部功能和內部實現(xiàn)的理解和認識。（2）基本功能：主要包括：改變目錄（CD,創(chuàng)建目錄（MD,顯示目錄（DIR）,刪除目錄（RD,打開全部 文件（openall ），打開單個文件（open）,建立一

2、個文件（create ）,刪除一個文件（delete ）, 寫文件（write ）,讀文件（read）,改文件的保護碼（change）,退出（exit ）等。（3）設計要求：設計一個10個用戶的文件系統(tǒng)。每個用戶最多可以保存10個文件，一次運行用戶可打開多個文件。程序采用二級文件目錄。（即設置主目錄（MFD和用戶文件目錄（UFD）。另外，可打開文件設置指針。為了方便實現(xiàn)，對文件的讀寫作了簡化。在執(zhí)行讀寫命令時，只需改讀寫指針。并不進行實際的讀寫操作。2 .總體設計2.1 數(shù)據(jù)結構struck filechar name10;int code;/保護碼int size;char pwrite;/

3、讀寫指針;struct userchar name10;struct file *list;目錄指針;2.2 主要函數(shù)聲明void running。；void delet（）;void write（）;void open（）;Word資料void close();void bye();void read();void create();void input();2.3模塊結構圖Main函數(shù)0巖鳥.一3 .詳細設計3.1 模塊及功能說明3.1.1 input() 模塊功能：進入文件系統(tǒng)。3.1.2 running。模塊功能：選擇相應的操作。3.1.3 bye()模塊功能：退出文件系統(tǒng)函數(shù) bye

4、()。3.1.4 create()模塊功能：創(chuàng)建文件。3.1.5 open()模塊功能：打開文件。3.1.6 close()模塊功能：關閉文件。3.1.7 write()模塊功能：寫文件(需要先打開文件)。3.1.8 read() 模塊功能：讀文件(需要先打開文件)。3.1.9 9 delet()模塊功能：刪除文件。3.2 模塊代碼3.2.1 main()模塊int main() input()；running。；return 0;3.2.2 input()模塊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。 模塊 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 .心得體會操作系統(tǒng)是計算機科學與技術專業(yè)中的一門重要基礎課，目的是讓我們了解操作系統(tǒng)的基本概念，理解計算機系統(tǒng)的資源如何組織，操作系統(tǒng)如何有效地管理這些系統(tǒng)資源，用戶如何通過操作系統(tǒng)與計算機系統(tǒng)打交道。通過課程設計，可以進一步理解在計算機系統(tǒng)上運行的其它各類操作系統(tǒng)，并懂得在操作系統(tǒng)的支持下建立自己的應用系統(tǒng)。 操作系統(tǒng)課程設計， 對于訓練我們掌握程序設計、 熟 悉上機操作和程序調試技術都有重要作用。 重點培養(yǎng)我們的思維能力、創(chuàng)新能力和排錯能力。通過課程設計，進一步融會貫通教材內容，掌握程序各功能模塊的工作原

12、理，相互聯(lián)系和來龍去脈，完整地建立系統(tǒng)的概念。激發(fā)我的學習熱情和主動性，培養(yǎng)我的獨立工作能力， 在實踐活動中，將所學知識綜合運用，增長才干，并積累經(jīng)驗。對編程語言又有了更深一層次的認識，并對編程能力有所加強， 但還是很多的不足有待改進， 對于編程來說還需要大量 的實踐，才能在發(fā)現(xiàn)問題和解決問題中前進與提高。5 .附錄：源代碼#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資料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資料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資料 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!");