操作系统二级文件系统(报告 源代码)天津科技大学

1、操作系统课程设计报告11103303 程路峰操作系统课程设计报告专 业：软件工程学 号：11103303姓 名：程路峰提交日期：2014/1/2【设计目的】1、本实验的目的是通过一个简单多用户文件系统的设计，加深理解文件系统的内部功能和内部实现。2、结合数据结构、程序设计、计算机原理等课程的知识，设计一个二级文件系统，进一步理解操作系统。.【设计内容】为linux系统设计一个简单的二级文件系统。要求做到以下几点：可以实现下列几条命令：login 用户登录dir 列目录 attrib 修改文件属性create 创建文件delete 删除文件open 打开文件close 关闭文件read 读文件w

2、rite 写文件cd 进出目录列目录时要列出文件名，物理地址，保护码和文件长度源文件可以进行读写保护.【实验环境】windows7操作平台visual studio2010【相关知识综述】理解二级目录的文件系统的组织；掌握常用的数据结构；系统采用两级目录，其中第一级对应于用户账号，第二级对应于用户帐号下的文件;使用文件来模拟外存，进行数据结构设计和操作算法的设计，实现一个文件系统并实现基本的文件操作（为了简便文件系统，不考虑文件共享，文件系统安全以及管道文件与设备文件等特殊内容）。【设计思路】采用的数据结构、主要的函数说明、程序流程设计等本文件系统采用两级目录，其中第一级对应于用户账号，第二级

3、对应于用户帐号下的文件。另外，为了简便文件系统未考虑文件共享，文件系统安全以及管道文件与设备文件等特殊内容。首先应确定文件系统的数据结构：主目录、子目录及活动文件等。主目录和子目录都以文件的形式存放于磁盘，这样便于查找和修改。用户创建的文件，可以编号存储于磁盘上。如：file0,file1,file2并以编号作为物理地址，在目录中进行登记1.主要的数据结构#define maxname 25 /*the largest length of mfdname,ufdname,filename表示三种文件的长度都为25*/#define maxchild 50 /*the largest child

4、每个用户下可以有50个文件*/#define max (maxchild*maxchild) /*the size of fpaddrno定义一个常量2500个扇区*/typedef struct /*the structure of osfile*/int fpaddr; /*file physical address物理地址*/ int flength; /*file length文件长度*/ int fmode; /*file mode:0-read only;1-write only;2-read and write; 3-protect;*/ char fnamemaxname; /

5、*file name文件名*/ osfile;typedef struct /*the structure of osufd*/char ufdnamemaxname; /*ufd name*/osfile ufdfilemaxchild; /*ufd own file*/osufd;/*osf文件的数据结构*/typedef struct /*the structure of osufdlogin*/char ufdnamemaxname; /*ufd name*/ char ufdpword8; /*ufd password*/ osufd_login;typedef struct /*f

6、ile open mode*/int ifopen; /*ifopen:0-close,1-open*/ int openmode; /*0-read only,1-write only,2-read and write,3-initial*/osufd_openmode;2.主要函数void loginf(); /*login filesystem*/void dirf(); /*dir filesystem*/void cdf(); /*change dir*/void createf(); /*create file*/void deletef(); /*delete file*/voi

7、d modifyfm(); /*modify filemode*/void openf(); /*open file*/void closef(); /*close file*/void readf(); /*read file*/void writef(); /*write file*/void quitf(); /*quit filesystem退出文件系统*/void help();3总体功能程序结构图打开命令的程序流程图 关闭命令的程序流程图写命令程序流程图 删除命令的程序流程图：【部分源程序清单】打开函数void openf() int fc,i;char fnamemaxname,

8、fmode25;int fm;printf(nplease input filename:);gets(fname);ltrim(rtrim(fname);if (existf(fname)0)printf(nerror. name %s is not existed.n,fname);wgetchar=1;elsei=existd(username);for(int a=0;aufdfilea.fname)=0)fc=a;break;ifopenifc.ifopen=1;printf(please input openmode(0-read only, 1-write only, 2-rea

9、d and write, 3-protect):);gets(fmode);fm=atoi(fmode);ifopenifc.openmode=fm;printf(nopen successed);wgetchar=1;关闭函数void closef() char fnamemaxname;int i,k;if (strcmp(strupr(dirname),strupr(username)!=0) printf(nerror.you can only modify filemode in yourself dir.n);elseprintf(nplease input filename:);

10、gets(fname);ltrim(rtrim(fname); i=existf(fname); if (i=0) k=existd(username); if(ifopenki.ifopen=0) printf(nerror. %s has been closed. you can not close it again.n,fname);else ifopenki.ifopen=0; ifopenki.openmode=4; printf(%s has been closed successfully!,fname);else printf(nerror. %s dose not exist

11、.n,fname);删除函数void deletef() /*delete file*/char fnamemaxname,str50,str150;int i,k,j;int fpaddrno1;if (strcmp(strupr(ltrim(rtrim(dirname),)=0) printf(nerror.please convert to ufd dir before delete.n);wgetchar=1;if (strcmp(strupr(dirname),strupr(username)!=0) printf(nerror.you can only modify filemod

12、e in yourself dir.n);wgetchar=1;elseprintf(nplease input filename:);gets(fname);ltrim(rtrim(fname);i=existf(fname);if (i=0)k=existd(username);if(ifopenki.ifopen=1)printf(nerror.%s is in open status. close it before delete.n,fname); wgetchar=1;elseif(ufdk-ufdfilei.fmode=3)printf(nerror.%s is in prote

13、ct status. close it before delete.n,fname); wgetchar=1;elsefpaddrno1=ufdk-ufdfilei.fpaddr;fpaddrnofpaddrno1=0;for(j=i;jufdfilej=ufdk-ufdfilej+1;strcpy(str,d:osfilefilefile);itoa(fpaddrno1,str1,10);strcat(str,str1);strcat(str,.txt);remove(str);fcountk-;printf(n %sis deleted successfully.n,fname);wget

14、char=1;elseprintf(nerror. %s dose not exist.n,fname);wgetchar=1;写入函数void writef() int i,k,m=0;int length;char fnamemaxname;char str255,str1255;if (strcmp(strupr(dirname),strupr(username)!=0) printf(nerror.please convert to ufd dir before write.n);wgetchar=1;return;printf(ncaution:open file firstn);p

15、rintf(opened file(s) list:n);k=existd(dirname);for(i=0;iufdfilei.fname);m+;if(m%4=0)&(m!=0) printf(n);printf(n%d files openned.n,m);if (m=0) wgetchar=1;if(m!=0)printf(nplease input filename:);gets(fname);ltrim(rtrim(fname);i=existf(fname);if(i=0)if(ifopenki.ifopen=1)if(ifopenki.openmode=1) |(ifopenk

16、i.openmode=2)itoa(ufdk-ufdfilei.fpaddr,str,10);strcpy(str1,file);strcat(str1,str);strcpy(str,c:osfilefile);strcat(str,str1);strcat(str,.txt);fp_file=fopen(str,ab);length=writef1(); ufdk-ufdfilei.flength=ufdk-ufdfilei.flength+length;printf(nn%d length.n,ufdk-ufdfilei.flength);printf(nnyou have write

17、file successfully!); fclose(fp_file);wgetchar=0;else if(ifopenki.openmode=0)printf(nerror.%s has been opened with read only mode. it isnt write.n,fname);wgetchar=1;elseprintf(nerror.%s has been opened with protect mode. it isnt write.n,fname);wgetchar=1;else printf(nerror.%s is in closing status. pl

18、ease open it before writen,fname);wgetchar=1;else printf(nerror. %s does not exist.n,fname);wgetchar=1;【测试结果】登录用户 创建文件：打开文件：关闭文件：第一次读文件（查看原文件内容）：写文件：再次读取文件（查看是否写入成功） 列出目录和帮助：删除文件：【设计总结】【源程序】#include stdio.h#include string.h#include conio.h#include stdlib.h#define maxname 25 /*the largest length of m

19、fdname,ufdname,filename*/#define maxchild 50 /*the largest child*/#define max (maxchild*maxchild) /*the size of fpaddrno*/typedef struct /*the structure of osfile*/int fpaddr; /*file physical address*/ int flength; /*file length*/ int fmode; /*file mode:0-read only;1-write only;2-read and write; 3-p

20、rotect;*/ char fnamemaxname; /*file name*/ osfile;typedef struct /*the structure of osufd*/char ufdnamemaxname; /*ufd name*/osfile ufdfilemaxchild; /*ufd own file*/osufd;typedef struct /*the structure of osufdlogin*/char ufdnamemaxname; /*ufd name*/ char ufdpword8; /*ufd password*/ osufd_login;typed

21、ef struct /*file open mode*/int ifopen; /*ifopen:0-close,1-open*/ int openmode; /*0-read only,1-write only,2-read and write,3-initial*/osufd_openmode;osufd *ufdmaxchild; /*ufd and ufd own files*/osufd_login ufd_lp;int ucount=0; /*the count of mfds ufds*/int fcountmaxchild; /*the count of ufds files*

22、/int loginsuc=0; /*whether login successfully*/char usernamemaxname; /*record login users name22*/char dirnamemaxname;/*record current directory*/int fpaddrnomax; /*record file physical address num*/osufd_openmode ifopenmaxchildmaxchild; /*record file open/close*/int wgetchar; /*whether getchar()*/f

23、ile *fp_mfd,*fp_ufd,*fp_file_p,*fp_file;void loginf(); /*login filesystem*/void dirf(); /*dir filesystem*/void cdf(); /*change dir*/void createf(); /*create file*/void deletef(); /*delete file*/void modifyfm(); /*modify filemode*/void openf(); /*open file*/void closef(); /*close file*/void readf();

24、/*read file*/void writef(); /*write file*/void quitf(); /*quit filesystem*/void help();char *rtrim(char *str); /*remove the trailing blanks.*/char *ltrim(char *str); /*remove the heading blanks.*/void inputpw(char *password); /*input password,use * replace*/void setpano(int rorw); /*set physical add

25、ress num*/int existd(char *dirname); /*whether dirname exist,exist-i,not exist-0*/int writef1(); /*write file*/int existf(char *filename); /*whether filename exist,exist-i,not exist-0*/int findpano(); /*find out physical address num*/ void clrscr()system(cls);void main()int i,choice1;char choice50;

26、/*choice operation:dir,create,delete,open,delete,modify,read,write*/int choiceend=1; /*whether choice end*/char *rtrim(char *str); /*remove the trailing blanks.*/char *ltrim(char *str); /*remove the heading blanks.*/if(fp_mfd=fopen(c:osfilemfd.txt,rb)=null)fp_mfd=fopen(c:osfilemfd.txt,wb);fclose(fp_

27、mfd);for(i=0;i,strupr(dirname);else printf(bad command or file name.nc:%s,strupr(username); gets(choice); strcpy(choice,ltrim(rtrim(strlwr(choice); if (strcmp(choice,dir)=0) choice1=1; else if(strcmp(choice,create)=0) choice1=2; else if(strcmp(choice,delete)=0) choice1=3; else if(strcmp(choice,attri

28、b)=0) choice1=4; else if(strcmp(choice,open)=0) choice1=5; else if(strcmp(choice,close)=0) choice1=6; else if(strcmp(choice,read)=0) choice1=7; else if(strcmp(choice,write)=0) choice1=8; else if(strcmp(choice,exit)=0) choice1=9; else if(strcmp(choice,cls)=0) choice1=10; else if(strcmp(choice,cd)=0)

29、choice1=11; else if(strcmp(choice,help)=0) choice1=20; else choice1=12;switch(choice1)case 1:dirf();choiceend=1;break;case 2:createf();choiceend=1;if(!wgetchar) getchar();break;case 3:deletef();choiceend=1;if(!wgetchar)getchar();break;case 4:modifyfm();choiceend=1;if(!wgetchar) getchar();break;case

30、5:openf();choiceend=1;if (!wgetchar) getchar();break;case 6:closef();choiceend=1;if (!wgetchar) getchar();break;case 7:readf();choiceend=1;if (!wgetchar) getchar();break;case 8:writef();choiceend=1;if (!wgetchar) getchar();break;case 9:printf(nyou have exited this system.); quitf();exit(0);break;cas

31、e 10:clrscr();choiceend=1;break;case 11:cdf();choiceend=1;break;case 20:help();choiceend=1;break;default:choiceend=0;else printf(naccess denied.);void help(void)printf(nthe command listn);printf(n 改变目录-cd 修改文件属性attrib 新建文件create 写文件write 读文件read 打开文件open 清屏cls 删除delete 退出exit 关闭文件closen);char *rtrim

32、(char *str) /*remove the trailing blanks.*/int n=strlen(str)-1;while(n=0)if(*(str+n)!= )*(str+n+1)=0;break;else n-;if (nufdname,strupr(ufd_lp.ufdname);fp_ufd=fopen(str,rb);fcountj=0;for(i=0;fread(&ufdj-ufdfilei,sizeof(osfile),1,fp_ufd)!=0;i+,fcountj+)ifopenji.ifopen=0;ifopenji.openmode=4;fclose(fp_u

33、fd);fclose(fp_mfd);ucount=j;setpano(0);printf(nnlogin successful! welcome to this filesystemnn);loginsuc=1;return;elseprintf(nn);flag=1;while(flag)printf(login failed! password error. try again(y/n):);gets(a);ltrim(rtrim(a);if (strcmp(strupr(a),y)=0) loginsuc=0;flag=0;else if(strcmp(strupr(a),n)=0)l

34、oginsuc=0;flag=0;return;elseprintf(new password(=8):);inputpw(loginpw); /*input new password,use * replace*/printf(nconfirm password(ufdname,strupr(ufd_lp.ufdname);fp_ufd=fopen(str,rb);for(i=0;fread(&ufdj-ufdfilei,sizeof(osfile),1,fp_ufd)!=0;i+,fcountj+)ifopenji.ifopen=0; ifopenji.openmode=4;fclose(

35、fp_ufd);fclose(fp_mfd);ucount=j;setpano(0);printf(nnlogin successful! welcome to this systemnn);loginsuc=1;return; elseprintf(nn);flag=1;while(flag)printf(login failed! password error. try again(y/n):);gets(a);ltrim(rtrim(a);if (strcmp(strupr(a),y)=0) loginsuc=0;flag=0;else if(strcmp(strupr(a),n)=0)

36、loginsuc=0;flag=0;return;void setpano(int rorw) /*set physical address num,0-read,1-write*/int i,j;if (rorw=0)if(fp_file_p=fopen(c:osfilefilefile_p.txt,rb)=null) fp_file_p=fopen(c:osfilefilefile_p.txt,wb);fclose(fp_file_p); fp_file_p=fopen(c:osfilefilefile_p.txt,rb);/for(i=0;fread(&j,sizeof(int),1,f

37、p_file_p)!=0;i+)fpaddrnoj=1;/*for(i=1;imax;i+)if (i%13)=0) fpaddrnoi=1;*/elsefp_file_p=fopen(c:osfilefilefile_p.txt,wb);/*for(i=1;imax;i+)if(i%13)=0) fpaddrnoi=0;*/for(i=0;imax;i+)if (fpaddrnoi=1)fwrite(&i,sizeof(int),1,fp_file_p);fclose(fp_file_p);void inputpw(char *password) /*input password,use * replace*/int j;for(j=0;j0)j-;j-;putchar(b);putchar( );putchar(b);else j-;elsepasswordj=0;break;passwordj=0;void dirf() /*dir filesystem*/int i,j,count=0;char sfmode25,sfpaddr25,str25;clrscr();if (strcmp(str