Unix-File-System

This project represent a Unix file system in a file.

Here is the instruction of how to use:

• Before you start

make all

Create new ufs

• mymkfs(s)
  • Parameter s will be the size of the file system file.

Load\Save

• mymount()
  • First parameter is the path where you want to save the mounted file_system.
  • Second parameter is the path of the loaded file_system.

Handle files in the system

In order to read/write into a file, you must open it first using myopen()

• myopen(path, flag)
  • Path parameter defines which file to open from the f_system.
  • Flag parameter determine the decisions of the program in case the requested file or any directory in the path do not exist.
    • Pass O_CREAT flag to the function to open a new file in case it does not exist.
  • RETURN the file descriptor of the file.

Write to file:

• mywrite(fd,buf,count)
  • fd parameter will be the file descriptor of the file, returned from myopen()
  • buf parameter is a provided char* from the user that contain the context of what to write.
  • count parameter is the off-set that tells the program how many chars to write.
  • RETURN the number of writen bytes

read from file:

• myread(fd, buf, count)
  • fd parameter will be the file descriptor of the file, returned from myopen()
  • buf parameter is a provided char* from the user that will be filled with the content from the file.
  • count parameter is the off-set that tells the program how many chars to read from the file.
  • RETURN the number of bytes that we read.

handle write/read file pointer:

• mylseek(fd, offset, whence)
  • fd parameter will be the file descriptor of the file, returned from myopen()
  • offset will be the number of bytes that the pointer will move.
  • whence is a flag that set the starting point of the pointer before offset and support 3 options:
    • SEEK_SET - set the pointer to the beginning of the file.
    • SEEK_CUR - current position of the pointer
    • SEEK_END - set the pointer to the end of the file.
  • RETURN the position of the pointer.

Test

./test

At the end don't forget to call destroy_mkmfs()

./make clean