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use crate::disk::block::InodeBlock;
use crate::disk::inode::{Inode, INODE_SIZE};
use crate::{utils, AyaFS};
use and_then_some::BoolExt;
use fuser::FileType;
use libc::{c_int, EIO, EISDIR, ENOENT, ENOTDIR, ENOTEMPTY};
use log::{debug, error};
use std::ffi::OsStr;
use std::os::unix::ffi::OsStrExt;
use std::path::Path;
use std::slice;
impl AyaFS {
pub(crate) fn create_file(
&mut self,
permissions: u16,
uid: u32,
gid: u32,
flags: u32,
) -> Option<(usize, &Inode)> {
self.inode_bitmap.allocate().map(|inode_index| {
self.get_inode_mut(inode_index).map(|inode| {
*inode = Inode::file(permissions, uid, gid, utils::time_now(), flags, 0, 0, 0);
});
(inode_index, self.get_inode(inode_index).unwrap())
})
}
pub(crate) fn create_symlink(
&mut self,
permissions: u16,
uid: u32,
gid: u32,
flags: u32,
) -> Option<(usize, &Inode)> {
self.inode_bitmap.allocate().map(|inode_index| {
self.get_inode_mut(inode_index).map(|inode| {
*inode = Inode::symlink(permissions, uid, gid, utils::time_now(), flags, 0, 0, 0);
});
(inode_index, self.get_inode(inode_index).unwrap())
})
}
/// 根目录的 parent_inode_number 传入 None, 会直接以自己作为 .. 的 inode number
pub(crate) fn create_directory(
&mut self,
permissions: u16,
uid: u32,
gid: u32,
flags: u32,
parent_inode_number: Option<usize>,
) -> Option<(usize, &Inode)> {
self.inode_bitmap.allocate().map(|inode_index| {
// 创建 Inode
let mut new_inode =
Inode::directory(permissions, uid, gid, utils::time_now(), flags, 0, 0, 0);
self.init_direntry_map(inode_index);
self.add_direntry(inode_index, &mut new_inode, inode_index, ".", 0x2)
.unwrap();
self.add_direntry(
inode_index,
&mut new_inode,
parent_inode_number.unwrap_or(inode_index),
"..",
0x2,
)
.unwrap();
// 把 inode 放到指定位置
self.get_inode_mut(inode_index).map(|inode| {
*inode = new_inode;
});
(inode_index, self.get_inode(inode_index).unwrap())
})
}
pub(crate) fn remove_file(&mut self, inode_index: usize) -> Result<bool, c_int> {
if self.inode_bitmap.query(inode_index) {
let (block_index, offset) = self.locate_inode(inode_index);
if let Some(cached_block) = self.cached_inodes.get_block::<InodeBlock>(block_index) {
let inode = cached_block.block.inodes[offset / INODE_SIZE].clone();
match inode.file_type() {
FileType::RegularFile => self.deallocate_all_blocks_for(&inode).unwrap(),
FileType::Symlink => {
if inode.size >= 60 {
self.deallocate_all_blocks_for(&inode).unwrap();
}
}
FileType::Directory => return Err(EISDIR),
_ => return Err(EIO),
}
}
self.inode_bitmap.deallocate(inode_index);
Ok(true)
} else {
Err(ENOENT)
}
}
// 要删除的 inode 一定得是空的
pub(crate) fn remove_dir(&mut self, inode_index: usize) -> Result<bool, c_int> {
if self.inode_bitmap.query(inode_index) {
let (block_index, offset) = self.locate_inode(inode_index);
if let Some(cached_block) = self.cached_inodes.get_block::<InodeBlock>(block_index) {
let inode = &cached_block.block.inodes[offset / INODE_SIZE].clone();
if !inode.is_dir() {
// 不是 dir -> ENOTDIR
return Err(ENOTDIR);
}
if inode.size > 2 {
// 有 . 和 .. 以外的 entry -> ENOTEMPTY
return Err(ENOTEMPTY);
}
// 销毁 inode 里的所有 block
self.deallocate_all_blocks_for(inode).unwrap();
}
// 销毁 inode
self.inode_bitmap.deallocate(inode_index);
Ok(true)
} else {
Err(ENOENT)
}
}
pub(crate) fn update_inode(&mut self, inode_index: usize, inode: Inode) -> bool {
if self.inode_bitmap.query(inode_index) {
let (block_index, offset) = self.locate_inode(inode_index);
if let Some(cached_block) = self.cached_inodes.get_block_mut::<InodeBlock>(block_index)
{
cached_block.block.inodes[offset / INODE_SIZE] = inode;
}
true
} else {
false
}
}
pub(crate) fn get_inode(&mut self, inode_index: usize) -> Option<&Inode> {
self.inode_bitmap.query(inode_index).and_then(|| {
let (block_index, offset) = self.locate_inode(inode_index);
// debug!("get_inode(inode_index: {}) -> block_index: {}, offset: {}", inode_index, block_index, offset);
self.cached_inodes
.get_block::<InodeBlock>(block_index)
.map(|cached_block| &cached_block.block.inodes[offset / INODE_SIZE])
})
}
pub(crate) fn get_inode_mut(&mut self, inode_index: usize) -> Option<&mut Inode> {
self.inode_bitmap.query(inode_index).and_then(|| {
let (block_index, offset) = self.locate_inode(inode_index);
// debug!("get_inode_mut(inode_index: {}) -> block_index: {}, offset: {}", inode_index, block_index, offset);
self.cached_inodes
.get_block_mut::<InodeBlock>(block_index)
.map(|cached_block| {
cached_block.dirty = true; // 保守一些, 只要返回了 &mut Inode 这个页一定标记为脏
&mut cached_block.block.inodes[offset / INODE_SIZE]
})
})
}
#[allow(unused)]
pub(crate) fn peek_inode(&self, inode_index: usize) -> Option<&Inode> {
self.inode_bitmap.query(inode_index).and_then(|| {
let (block_index, offset) = self.locate_inode(inode_index);
self.cached_inodes
.peek_block::<InodeBlock>(block_index)
.map(|cached_block| &cached_block.block.inodes[offset / INODE_SIZE])
})
}
#[allow(unused)]
pub(crate) fn peek_inode_mut(&mut self, inode_index: usize) -> Option<&mut Inode> {
self.inode_bitmap.query(inode_index).and_then(|| {
let (block_index, offset) = self.locate_inode(inode_index);
self.cached_inodes
.peek_block_mut::<InodeBlock>(block_index)
.map(|cached_block| {
cached_block.dirty = true; // 保守一些, 只要返回了 &mut Inode 这个页一定标记为脏
&mut cached_block.block.inodes[offset / INODE_SIZE]
})
})
}
}
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