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use crate::block_device::BLOCK_SIZE;
use crate::disk::inode::{Inode, INODE_SIZE};
use crate::{AyaFS, INODE_PER_BLOCK};
use fuser::FileAttr;
use std::time::{Duration, SystemTime, UNIX_EPOCH};
pub(crate) fn time_now() -> u32 {
SystemTime::now()
.duration_since(UNIX_EPOCH)
.expect("How can current time be earlier than UNIX_EPOCH?")
.as_secs() as u32
}
pub(crate) fn from_systime(system_time: SystemTime) -> u32 {
system_time
.duration_since(UNIX_EPOCH)
.expect("How can current time be earlier than UNIX_EPOCH?")
.as_secs() as u32
}
pub(crate) fn make_fileattr(inode_index: usize, inode: &Inode) -> FileAttr {
FileAttr {
ino: inode_index as u64,
size: inode.size as u64,
blocks: inode.n_blocks as u64,
atime: to_systime(inode.atime),
mtime: to_systime(inode.atime),
ctime: to_systime(inode.ctime),
crtime: to_systime(inode.crtime),
kind: inode.mode.into(),
perm: inode.mode.perm(),
nlink: inode.n_links as u32,
uid: inode.uid,
gid: inode.gid,
rdev: 0, // 我们不会遇到这个的
blksize: BLOCK_SIZE as u32,
flags: inode.flags,
}
}
pub(crate) fn to_systime(time: u32) -> SystemTime {
UNIX_EPOCH + Duration::from_secs(time as u64)
}
impl AyaFS {
/// 输入 inode 编号, 返回它对应的 block number 和 block 内 offset
pub(crate) fn locate_inode(&self, inode_index: usize) -> (usize, usize) {
let block_number =
inode_index / INODE_PER_BLOCK + 1 + self.inode_bitmap.length + self.data_bitmap.length;
let block_offset = inode_index % INODE_PER_BLOCK * INODE_SIZE;
(block_number, block_offset)
}
}
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