This is an implementation of a File System based on Linux FS.
Use the following command to open a shell.
make && ./shell
We implemented the following commands
mkfs: formats the disk
open <filename> <flag> : opens a file given its name and flags. The flag argument is an integer that corresponds to
- 1: Read Only;
- 2: Write Only;
- 3: Read and Write.
If the filename does not exist and flag is 2 or 3, then the file is created.
Relative path are not implemented, so you must be on the path where the desired file is (or will be, if you create it).
read <fd> <size>: reads <size> bytes from the file associated with file descriptor <fd>. This action moves the file pointer of the <fd> forward.
write <fd> <string>: writes <string> on file associated with file descriptor <fd>. This action moves the file pointer of the <fd> forward.
lseek <fd> <offset>: moves the file pointer associated with file descriptor <fd> to <offset> from the beggining of the file.
close <fd>: closes file associated with <fd>.
mkdir <dirname>: creates a subdirectory named <dirname> in the current path.
rmdir <dirname>: erases the subdirectory named <dirname> in the current path if it is empty.
cd <dirname>: moves current path to <dirname>.
link <src_name> <dest_name>: creates a link between <src_name> and <dest_name>. They must be in the same directory.
unlink <filename>: removes a link to file <filename>.
ls: lists the current directory contents.
cat <filename>: shows the content the given file.
create <filename> <size>: creates a file in the current directory named <filename> and sized <size> bytes.
fsck: prints disk information, such as the magic number, the number of inodes allocated and its bitmap and the number of blocks allocated and its bitmap.
Blocks have 512 bytes.
We have 256 blocks with 8 inodes each, resulting in a total of 2048 inodes available.
Each inode has 10 direct blocks, 1 single indirect block, 1 double indirect block and 1 triple indirect block.