1) Multi-user (2) multi-level directory: with a tree directory structure (3) with a login (user) and user authentication function (4) file creation: create (5) the file is open: open (6 ) file read: read (7) to write the file: write (8) Closing the file: close (9) delete the file: delete (12) lists the files directory: dir (out directory to list the file name, physical address, and file size) (13) exit: logout (14) File Protection-integrity of the file system

操作系统实验四：文件系统
........................\code
........................\....\access.c
........................\....\bak
........................\....\...\access.c
........................\....\...\ballfre.c
........................\....\...\close.c
........................\....\...\creat.c
........................\....\...\delete.c
........................\....\...\dir.c
........................\....\...\dirlt.c
........................\....\...\filesys.h
........................\....\...\format.c
........................\....\...\halt.c
........................\....\...\iallfre.c
........................\....\...\igetput.c
........................\....\...\install.c
........................\....\...\log.c
........................\....\...\main.c
........................\....\...\name.c
........................\....\...\open.c
........................\....\...\rdwt.c
........................\....\...\smakefile
........................\....\ballfre.c
........................\....\close.c
........................\....\creat.c
........................\....\delete.c
........................\....\dir.c
........................\....\dirlt.c
........................\....\filesys.h
........................\....\filesys_vc工程
........................\....\..............\access.c
........................\....\..............\ballfre.c
........................\....\..............\close.c
........................\....\..............\creat.c
........................\....\..............\Debug
........................\....\..............\delete.c
........................\....\..............\dir.c
........................\....\..............\dirlt.c
........................\....\..............\filesys.h
........................\....\..............\format.c
........................\....\..............\halt.c
........................\....\..............\iallfre.c
........................\....\..............\igetput.c
........................\....\..............\install.c
........................\....\..............\main.c
........................\....\..............\main.dsp
........................\....\..............\main.dsw
........................\....\..............\main.ncb
........................\....\..............\main.opt
........................\....\..............\main.plg
........................\....\..............\name.c
........................\....\..............\open.c
........................\....\..............\rdwt.c
........................\....\filesys_vc工程.rar
........................\....\format.c
........................\....\halt.c
........................\....\iallfre.c
........................\....\igetput.c
........................\....\install.c
........................\....\log.c
........................\....\main.c
........................\....\name.c
........................\....\open.c
........................\....\rdwt.c
........................\....\smakefile
........................\....\说明.txt
........................\操作系统实验四：文件系统.doc

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