The Second Filesystem (SecondFS, UnixV6++ Filesystem)
(For user manual, please refer to "Instructions for use" section directly.)
UnixV6++ filesystem was designed on the basis of UnixV6++, an experimental and educational C++ UNIX V6 implementation under Intel 80386 architecture, written by Chen Hongzhong's team (https://gitee.com/solym/UNIX_V6PP) in Department of Computer Science and Technology, Tongji University.
This project is a second-level file system similar to the Unix file system, that is, a common large file (mydisk.img, called a first-level file) is used to simulate a file volume of the UNIX V6++ file system.
Operating system：Windows WSL Ubuntu 18.04 LTS
Compiler：gcc-c++ version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
cd to the Src directory and execute the make command to compile with g++. After the compilation is successful, the executable file of secondfilesystem will be generated, and the executable file of ./seconfilesystem will run directly.
After executing the make operation, the default generated system disk is an empty file, and the unix-style system disk initialization required by the experiment can be completed by the fformat command.
man : Help manual
fformat : System initialization
exit : Exit correctly
mkdir : New directory
cd : Change directory
ls : List directories and files
fcreat : Create a new file
eg:fcreat -r/-w/-rw
fdelete : Delete Files
eg:fdelete
fopen : Open the file, the fd value of the file will be returned if the file is opened successfully, which is convenient for other functions
eg:fopen -r/-w/-rw
fclose : Close file
eg:fclose
flseek : Move the read and write pointer, starting from origin, move the read and write pointer to the offset
eg:flseek
fwrite : Read content from external file and write to internal file
eg: fwrite
fread : Read the content of the internal file and output to the screen
eg: fread
fin : To import the host file, you first need to create a file named <filename> in the secondary system
eg: fin
fout : Export file to host
eg: fout
Note: mkdir, cd, fcreat, fdelete, fopen all support relative and absolute paths
The secondary file system is initially empty, and all folders need to be added manually.
system initialization
fformat
cd home
Make Sub_directory
mkdir reports
mkdir texts
mkdir photos
File test
cd texts
fcreate test.txt -rw
fopen test.txt -rw
Now assume that the fd is 8, then
fwrite 8 test.txt 10
flseek 8 0 0
fread 8 10
fclose 8
System file import and export
cd /home/photos
fcreate temp -rw
fin temp icon.png
fout temp icon_out.png
The input and output operations of the experiment report are the same as above
exit
exit
After that, perform the corresponding test according to the requirements. For the specific test process, please refer to the full report.