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use bitflags::bitflags;
const DIRECT_NUMBER: usize = 15;
#[derive(Debug)]
pub struct InodeMode(u16);
bitflags! {
impl InodeMode: u16 {
const IXOTH = 0x0001;
const IWOTH = 0x0002;
const IROTH = 0x0004;
const IXGRP = 0x0008;
const IWGRP = 0x0010;
const IRGRP = 0x0020;
const IXUSR = 0x0040;
const IWUSR = 0x0080;
const IRUSR = 0x0100;
const ISVTX = 0x0200;
const ISGID = 0x0400;
const ISUID = 0x0800;
// These are mutually-exclusive:
const IFIFO = 0x1000;
const IFCHR = 0x2000;
const IFDIR = 0x4000;
const IFBLK = 0x6000;
const IFREG = 0x8000;
const IFLNK = 0xA000;
const IFSOCK = 0xC000;
}
}
/// Pretty much the same with ext2, with minor changes:
/// - removed OS dependent attributes (osd1 & osd2)
/// - removed i_faddr since fragmentation is not supported
/// - changed uid and gid from u16 to u32
/// - added more direct blocks for a total size of 128 bytes
/// TODO: do we need to extend time precision?
#[repr(C)]
#[derive(Debug)]
pub struct Inode {
mode: InodeMode,
uid: u32,
size: u32,
atime: u32, // time in seconds
ctime: u32,
mtime: u32,
dtime: u32,
gid: u32,
n_links: u16,
n_blocks: u32,
flags: u32, // TODO: do we actually need this? maybe just return 0
direct: [u32; DIRECT_NUMBER],
single_indirect: u32,
double_indirect: u32,
triple_indirect: u32,
generation: u32,
file_acl: u32,
dir_acl: u32, // TODO do we have to implement ACL......?
}
impl Inode {
pub fn directory() -> Self {
Self {
mode: InodeMode::IFDIR
| InodeMode::IRUSR
| InodeMode::IWUSR
| InodeMode::IXUSR
| InodeMode::IRGRP
| InodeMode::IXGRP
| InodeMode::IROTH
| InodeMode::IXOTH,
// Directory, 755 permissions
uid: 0,
size: 0,
atime: 0,
ctime: 0,
mtime: 0,
dtime: 0,
gid: 0,
n_links: 0,
n_blocks: 0,
flags: 0,
direct: [0; DIRECT_NUMBER],
single_indirect: 0,
double_indirect: 0,
triple_indirect: 0,
generation: 0,
file_acl: 0,
dir_acl: 0,
}
}
pub fn file() -> Self {
Self {
mode: InodeMode::IFREG
| InodeMode::IRUSR
| InodeMode::IWUSR
| InodeMode::IXUSR
| InodeMode::IRGRP
| InodeMode::IXGRP
| InodeMode::IROTH
| InodeMode::IXOTH,
// RegularFile, 755 permissions
uid: 0,
size: 0,
atime: 0,
ctime: 0,
mtime: 0,
dtime: 0,
gid: 0,
n_links: 0,
n_blocks: 0,
flags: 0,
direct: [0; DIRECT_NUMBER],
single_indirect: 0,
double_indirect: 0,
triple_indirect: 0,
generation: 0,
file_acl: 0,
dir_acl: 0,
}
}
}
//
// #[repr(C)]
// #[derive(Debug, Default)]
// pub struct FileInode {
// file_size: u32,
// direct_blocks: [u32; DIRECT_NUMBER],
// indirect_block: u32,
// doubly_indirect_block: u32,
// } // sizeof(FileInode) == 124 bytes
//
// #[repr(C)]
// #[derive(Debug, Default)]
// pub struct DirectoryInode {
// child_number: u32,
// direct_blocks: [u32; DIRECT_NUMBER],
// indirect_block: u32,
// doubly_indirect_block: u32,
// } // sizeof(FileInode) == 124 bytes
//
// #[repr(C)]
// #[derive(Debug)]
// pub enum Inode {
// File(FileInode),
// Directory(DirectoryInode),
// } // sizeof(Inode) == 128 bytes
pub const INODE_SIZE: usize = std::mem::size_of::<Inode>();
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