use crate::filesystem::vfs::file::FileMode; use crate::filesystem::vfs::make_rawdev; use crate::filesystem::vfs::{ core::generate_inode_id, FilePrivateData, FileSystem, FileType, IndexNode, Metadata, PollStatus, }; use crate::{libs::spinlock::SpinLock, syscall::SystemError, time::TimeSpec}; use alloc::{ string::String, sync::{Arc, Weak}, vec::Vec, }; // use uuid::{uuid, Uuid}; use super::{DevFS, DeviceINode}; #[derive(Debug)] pub struct ZeroInode { /// uuid 暂时不知道有什么用(x // uuid: Uuid, /// 指向自身的弱引用 self_ref: Weak, /// 指向inode所在的文件系统对象的指针 fs: Weak, /// INode 元数据 metadata: Metadata, } #[derive(Debug)] pub struct LockedZeroInode(SpinLock); impl LockedZeroInode { pub fn new() -> Arc { let inode = ZeroInode { // uuid: Uuid::new_v5(), self_ref: Weak::default(), fs: Weak::default(), metadata: Metadata { dev_id: 1, inode_id: generate_inode_id(), size: 0, blk_size: 0, blocks: 0, atime: TimeSpec::default(), mtime: TimeSpec::default(), ctime: TimeSpec::default(), file_type: FileType::CharDevice, // 文件夹,block设备,char设备 mode: 0o666, nlinks: 1, uid: 0, gid: 0, raw_dev: make_rawdev(1, 3), // 这里用来作为device number }, }; let result = Arc::new(LockedZeroInode(SpinLock::new(inode))); result.0.lock().self_ref = Arc::downgrade(&result); return result; } } impl DeviceINode for LockedZeroInode { fn set_fs(&self, fs: Weak) { self.0.lock().fs = fs; } } impl IndexNode for LockedZeroInode { fn as_any_ref(&self) -> &dyn core::any::Any { self } fn open(&self, _data: &mut FilePrivateData, _mode: &FileMode) -> Result<(), SystemError> { Err(SystemError::EOPNOTSUPP_OR_ENOTSUP) } fn close(&self, _data: &mut FilePrivateData) -> Result<(), SystemError> { Err(SystemError::EOPNOTSUPP_OR_ENOTSUP) } fn metadata(&self) -> Result { return Ok(self.0.lock().metadata.clone()); } fn fs(&self) -> Arc { return self.0.lock().fs.upgrade().unwrap(); } fn list(&self) -> Result, SystemError> { Err(SystemError::EOPNOTSUPP_OR_ENOTSUP) } fn set_metadata(&self, metadata: &Metadata) -> Result<(), SystemError> { let mut inode = self.0.lock(); inode.metadata.atime = metadata.atime; inode.metadata.mtime = metadata.mtime; inode.metadata.ctime = metadata.ctime; inode.metadata.mode = metadata.mode; inode.metadata.uid = metadata.uid; inode.metadata.gid = metadata.gid; return Ok(()); } fn poll(&self) -> Result { return Ok(PollStatus::READ | PollStatus::WRITE); } /// 读设备 - 应该调用设备的函数读写,而不是通过文件系统读写 fn read_at( &self, _offset: usize, len: usize, buf: &mut [u8], _data: &mut FilePrivateData, ) -> Result { if buf.len() < len { return Err(SystemError::EINVAL); } for i in 0..len { buf[i] = 0; } return Ok(len); } /// 写设备 - 应该调用设备的函数读写,而不是通过文件系统读写 fn write_at( &self, _offset: usize, len: usize, buf: &[u8], _data: &mut FilePrivateData, ) -> Result { if buf.len() < len { return Err(SystemError::EINVAL); } Ok(len) } }