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|
use bitflags::bitflags;
use fuser::{FileAttr, FileType};
use std::fs::File;
const DIRECT_NUMBER: usize = 15;
#[derive(Debug, Clone, Copy)]
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;
}
}
impl InodeMode {
pub(crate) fn perm(&self) -> u16 {
self.0 & 0x0FFF
}
pub(crate) fn is_file(&self) -> bool {
(self.0 & 0xF000) == Self::IFREG.0
}
pub(crate) fn is_dir(&self) -> bool {
(self.0 & 0xF000) == Self::IFDIR.0
}
pub(crate) fn validate(mode_value: u16) -> Option<Self> {
let valid_flags: [u16; 7] = [0x1000, 0x2000, 0x4000, 0x6000, 0x8000, 0xA000, 0xC000];
valid_flags
.contains(&(mode_value & 0xF000))
.then(|| Self(mode_value))
}
}
impl From<InodeMode> for FileType {
fn from(value: InodeMode) -> Self {
let type_flag = value.0 & 0xF000;
match type_flag {
0x1000 => FileType::NamedPipe,
0x2000 => FileType::CharDevice,
0x4000 => FileType::Directory,
0x6000 => FileType::BlockDevice,
0x8000 => FileType::RegularFile,
0xA000 => FileType::Symlink,
0xC000 => FileType::Socket,
_ => panic!("Invalid inode mode {:x}", type_flag),
}
}
}
/// 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, Clone)]
pub struct Inode {
pub mode: InodeMode,
pub uid: u32,
pub size: u32,
pub atime: u32, // access time, in seconds
pub ctime: u32, // change time, in seconds
pub mtime: u32, // modify time, in seconds
pub crtime: u32, // create time, in seconds
pub gid: u32,
pub n_links: u16,
pub n_blocks: u32,
pub flags: u32, // TODO: do we actually need this? maybe just return 0
pub direct: [u32; DIRECT_NUMBER],
pub single_indirect: u32,
pub double_indirect: u32,
pub triple_indirect: u32,
pub generation: u32,
pub file_acl: u32,
pub dir_acl: u32, // TODO do we have to implement ACL......?
}
impl Inode {
fn new(
mode: InodeMode,
uid: u32,
gid: u32,
time: u32,
flags: u32,
generation: u32,
file_acl: u32,
dir_acl: u32,
) -> Self {
Self {
mode,
uid,
size: 0,
atime: time,
ctime: time,
mtime: time,
crtime: time,
gid,
n_links: 0,
n_blocks: 0,
flags,
direct: [0; DIRECT_NUMBER],
single_indirect: 0,
double_indirect: 0,
triple_indirect: 0,
generation,
file_acl,
dir_acl,
}
}
pub fn make_inode(
permissions: u16,
mode: InodeMode,
uid: u32,
gid: u32,
time: u32,
flags: u32,
generation: u32,
file_acl: u32,
dir_acl: u32,
) -> Self {
Self::new(
InodeMode(permissions) | mode,
uid,
gid,
time,
flags,
generation,
file_acl,
dir_acl,
)
}
pub fn directory(
permissions: u16,
uid: u32,
gid: u32,
time: u32,
flags: u32,
generation: u32,
file_acl: u32,
dir_acl: u32,
) -> Self {
Self::new(
InodeMode(permissions) | InodeMode::IFDIR,
uid,
gid,
time,
flags,
generation,
file_acl,
dir_acl,
)
}
pub fn file(
permissions: u16,
uid: u32,
gid: u32,
time: u32,
flags: u32,
generation: u32,
file_acl: u32,
dir_acl: u32,
) -> Self {
Self::new(
InodeMode(permissions) | InodeMode::IFREG,
uid,
gid,
time,
flags,
generation,
file_acl,
dir_acl,
)
}
pub(crate) fn is_file(&self) -> bool {
self.mode.is_file()
}
pub(crate) fn is_dir(&self) -> bool {
self.mode.is_dir()
}
pub fn empty() -> Self {
Self::new(InodeMode(0), 0, 0, 0, 0, 0, 0, 0)
}
}
pub const INODE_SIZE: usize = std::mem::size_of::<Inode>();
|
