1 use crate::driver::base::device::device_number::DeviceNumber; 2 use crate::filesystem::vfs::file::FileMode; 3 use crate::filesystem::vfs::syscall::ModeType; 4 use crate::filesystem::vfs::{ 5 core::generate_inode_id, FilePrivateData, FileSystem, FileType, IndexNode, Metadata, 6 }; 7 use crate::libs::spinlock::SpinLockGuard; 8 use crate::{libs::spinlock::SpinLock, time::PosixTimeSpec}; 9 use alloc::{ 10 string::String, 11 sync::{Arc, Weak}, 12 vec::Vec, 13 }; 14 use system_error::SystemError; 15 // use uuid::{uuid, Uuid}; 16 use super::{DevFS, DeviceINode}; 17 18 #[derive(Debug)] 19 pub struct NullInode { 20 /// uuid 暂时不知道有什么用（x 21 // uuid: Uuid, 22 /// 指向自身的弱引用 23 self_ref: Weak<LockedNullInode>, 24 /// 指向inode所在的文件系统对象的指针 25 fs: Weak<DevFS>, 26 /// INode 元数据 27 metadata: Metadata, 28 } 29 30 #[derive(Debug)] 31 pub struct LockedNullInode(SpinLock<NullInode>); 32 33 impl LockedNullInode { 34 pub fn new() -> Arc<Self> { 35 let inode = NullInode { 36 // uuid: Uuid::new_v5(), 37 self_ref: Weak::default(), 38 fs: Weak::default(), 39 metadata: Metadata { 40 dev_id: 1, 41 inode_id: generate_inode_id(), 42 size: 0, 43 blk_size: 0, 44 blocks: 0, 45 atime: PosixTimeSpec::default(), 46 mtime: PosixTimeSpec::default(), 47 ctime: PosixTimeSpec::default(), 48 file_type: FileType::CharDevice, // 文件夹，block设备，char设备 49 mode: ModeType::from_bits_truncate(0o666), 50 nlinks: 1, 51 uid: 0, 52 gid: 0, 53 raw_dev: DeviceNumber::default(), // 这里用来作为device number 54 }, 55 }; 56 57 let result = Arc::new(LockedNullInode(SpinLock::new(inode))); 58 result.0.lock().self_ref = Arc::downgrade(&result); 59 60 return result; 61 } 62 } 63 64 impl DeviceINode for LockedNullInode { 65 fn set_fs(&self, fs: Weak<DevFS>) { 66 self.0.lock().fs = fs; 67 } 68 } 69 70 impl IndexNode for LockedNullInode { 71 fn as_any_ref(&self) -> &dyn core::any::Any { 72 self 73 } 74 75 fn open( 76 &self, 77 _data: SpinLockGuard<FilePrivateData>, 78 _mode: &FileMode, 79 ) -> Result<(), SystemError> { 80 return Ok(()); 81 } 82 83 fn close(&self, _data: SpinLockGuard<FilePrivateData>) -> Result<(), SystemError> { 84 return Ok(()); 85 } 86 87 fn metadata(&self) -> Result<Metadata, SystemError> { 88 return Ok(self.0.lock().metadata.clone()); 89 } 90 91 fn fs(&self) -> Arc<dyn FileSystem> { 92 return self.0.lock().fs.upgrade().unwrap(); 93 } 94 95 fn list(&self) -> Result<Vec<String>, SystemError> { 96 Err(SystemError::EOPNOTSUPP_OR_ENOTSUP) 97 } 98 99 fn set_metadata(&self, metadata: &Metadata) -> Result<(), SystemError> { 100 let mut inode = self.0.lock(); 101 inode.metadata.atime = metadata.atime; 102 inode.metadata.mtime = metadata.mtime; 103 inode.metadata.ctime = metadata.ctime; 104 inode.metadata.mode = metadata.mode; 105 inode.metadata.uid = metadata.uid; 106 inode.metadata.gid = metadata.gid; 107 108 return Ok(()); 109 } 110 111 /// 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 112 fn read_at( 113 &self, 114 _offset: usize, 115 _len: usize, 116 _buf: &mut [u8], 117 _data: SpinLockGuard<FilePrivateData>, 118 ) -> Result<usize, SystemError> { 119 return Ok(0); 120 } 121 122 /// 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 123 fn write_at( 124 &self, 125 _offset: usize, 126 len: usize, 127 buf: &[u8], 128 _data: SpinLockGuard<FilePrivateData>, 129 ) -> Result<usize, SystemError> { 130 if buf.len() < len { 131 return Err(SystemError::EINVAL); 132 } 133 134 Ok(len) 135 } 136 } 137