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//! This module contains all the data structures used to track information
//! about inodes, which present tvix-castore nodes in a filesystem.
use std::time::Duration;
use crate::proto as castorepb;
use crate::B3Digest;
#[derive(Clone, Debug)]
pub enum InodeData {
Regular(B3Digest, u64, bool), // digest, size, executable
Symlink(bytes::Bytes), // target
Directory(DirectoryInodeData), // either [DirectoryInodeData:Sparse] or [DirectoryInodeData:Populated]
}
impl InodeData {
pub fn as_fuse_file_attr(&self, inode: u64) -> fuse_backend_rs::abi::fuse_abi::Attr {
fuse_backend_rs::abi::fuse_abi::Attr {
ino: inode,
// FUTUREWORK: play with this numbers, as it affects read sizes for client applications.
blocks: 1024,
size: match self {
InodeData::Regular(_, size, _) => *size,
InodeData::Symlink(target) => target.len() as u64,
InodeData::Directory(DirectoryInodeData::Sparse(_, size)) => *size,
InodeData::Directory(DirectoryInodeData::Populated(_, ref children)) => {
children.len() as u64
}
},
mode: match self {
InodeData::Regular(_, _, false) => libc::S_IFREG | 0o444, // no-executable files
InodeData::Regular(_, _, true) => libc::S_IFREG | 0o555, // executable files
InodeData::Symlink(_) => libc::S_IFLNK | 0o444,
InodeData::Directory(_) => libc::S_IFDIR | 0o555,
},
..Default::default()
}
}
pub fn as_fuse_entry(&self, inode: u64) -> fuse_backend_rs::api::filesystem::Entry {
fuse_backend_rs::api::filesystem::Entry {
inode,
attr: self.as_fuse_file_attr(inode).into(),
attr_timeout: Duration::MAX,
entry_timeout: Duration::MAX,
..Default::default()
}
}
}
/// This encodes the two different states of [InodeData::Directory].
/// Either the data still is sparse (we only saw a [castorepb::DirectoryNode],
/// but didn't fetch the [castorepb::Directory] struct yet, or we processed a
/// lookup and did fetch the data.
#[derive(Clone, Debug)]
pub enum DirectoryInodeData {
Sparse(B3Digest, u64), // digest, size
Populated(B3Digest, Vec<(u64, castorepb::node::Node)>), // [(child_inode, node)]
}
impl From<&castorepb::node::Node> for InodeData {
fn from(value: &castorepb::node::Node) -> Self {
match value {
castorepb::node::Node::Directory(directory_node) => directory_node.into(),
castorepb::node::Node::File(file_node) => file_node.into(),
castorepb::node::Node::Symlink(symlink_node) => symlink_node.into(),
}
}
}
impl From<&castorepb::SymlinkNode> for InodeData {
fn from(value: &castorepb::SymlinkNode) -> Self {
InodeData::Symlink(value.target.clone())
}
}
impl From<&castorepb::FileNode> for InodeData {
fn from(value: &castorepb::FileNode) -> Self {
InodeData::Regular(
value.digest.clone().try_into().unwrap(),
value.size,
value.executable,
)
}
}
/// Converts a DirectoryNode to a sparsely populated InodeData::Directory.
impl From<&castorepb::DirectoryNode> for InodeData {
fn from(value: &castorepb::DirectoryNode) -> Self {
InodeData::Directory(DirectoryInodeData::Sparse(
value.digest.clone().try_into().unwrap(),
value.size,
))
}
}
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