11496ba7bSLoGin use alloc::{ 21496ba7bSLoGin string::{String, ToString}, 31496ba7bSLoGin sync::Arc, 41496ba7bSLoGin vec::Vec, 51496ba7bSLoGin }; 6004e86ffSlogin 7004e86ffSlogin use crate::{ 8b087521eSChiichen driver::base::block::SeekFrom, 92b771e32SGou Ngai filesystem::vfs::file::FileDescriptorVec, 10aa0367d6SLoGin include::bindings::bindings::{verify_area, AT_REMOVEDIR, PAGE_4K_SIZE, PROC_MAX_FD_NUM}, 112b771e32SGou Ngai kerror, 121496ba7bSLoGin libs::rwlock::RwLockWriteGuard, 131496ba7bSLoGin mm::VirtAddr, 141496ba7bSLoGin process::ProcessManager, 15ab5c8ca4Slogin syscall::{Syscall, SystemError}, 1667b48188Shoumkh time::TimeSpec, 17004e86ffSlogin }; 18004e86ffSlogin 19004e86ffSlogin use super::{ 20ab5c8ca4Slogin core::{do_mkdir, do_remove_dir, do_unlink_at}, 216d81180bSLoGin fcntl::{FcntlCommand, FD_CLOEXEC}, 22004e86ffSlogin file::{File, FileMode}, 23ab5c8ca4Slogin utils::rsplit_path, 24ab5c8ca4Slogin Dirent, FileType, IndexNode, ROOT_INODE, 25004e86ffSlogin }; 26004e86ffSlogin 27ab5c8ca4Slogin pub const SEEK_SET: u32 = 0; 28ab5c8ca4Slogin pub const SEEK_CUR: u32 = 1; 29ab5c8ca4Slogin pub const SEEK_END: u32 = 2; 30ab5c8ca4Slogin pub const SEEK_MAX: u32 = 3; 31004e86ffSlogin 3267b48188Shoumkh bitflags! { 3367b48188Shoumkh /// 文件类型和权限 34*6b4e7a29SLoGin #[repr(C)] 3567b48188Shoumkh pub struct ModeType: u32 { 3667b48188Shoumkh /// 掩码 3767b48188Shoumkh const S_IFMT = 0o0_170_000; 3867b48188Shoumkh /// 文件类型 3967b48188Shoumkh const S_IFSOCK = 0o140000; 4067b48188Shoumkh const S_IFLNK = 0o120000; 4167b48188Shoumkh const S_IFREG = 0o100000; 4267b48188Shoumkh const S_IFBLK = 0o060000; 4367b48188Shoumkh const S_IFDIR = 0o040000; 4467b48188Shoumkh const S_IFCHR = 0o020000; 4567b48188Shoumkh const S_IFIFO = 0o010000; 4667b48188Shoumkh 4767b48188Shoumkh const S_ISUID = 0o004000; 4867b48188Shoumkh const S_ISGID = 0o002000; 4967b48188Shoumkh const S_ISVTX = 0o001000; 5067b48188Shoumkh /// 文件用户权限 5167b48188Shoumkh const S_IRWXU = 0o0700; 5267b48188Shoumkh const S_IRUSR = 0o0400; 5367b48188Shoumkh const S_IWUSR = 0o0200; 5467b48188Shoumkh const S_IXUSR = 0o0100; 5567b48188Shoumkh /// 文件组权限 5667b48188Shoumkh const S_IRWXG = 0o0070; 5767b48188Shoumkh const S_IRGRP = 0o0040; 5867b48188Shoumkh const S_IWGRP = 0o0020; 5967b48188Shoumkh const S_IXGRP = 0o0010; 6067b48188Shoumkh /// 文件其他用户权限 6167b48188Shoumkh const S_IRWXO = 0o0007; 6267b48188Shoumkh const S_IROTH = 0o0004; 6367b48188Shoumkh const S_IWOTH = 0o0002; 6467b48188Shoumkh const S_IXOTH = 0o0001; 6567b48188Shoumkh } 6667b48188Shoumkh } 6767b48188Shoumkh 6867b48188Shoumkh #[repr(C)] 6967b48188Shoumkh /// # 文件信息结构体 7067b48188Shoumkh pub struct PosixKstat { 7167b48188Shoumkh /// 硬件设备ID 7267b48188Shoumkh dev_id: u64, 7367b48188Shoumkh /// inode号 7467b48188Shoumkh inode: u64, 7567b48188Shoumkh /// 硬链接数 7667b48188Shoumkh nlink: u64, 7767b48188Shoumkh /// 文件权限 7867b48188Shoumkh mode: ModeType, 7967b48188Shoumkh /// 所有者用户ID 8067b48188Shoumkh uid: i32, 8167b48188Shoumkh /// 所有者组ID 8267b48188Shoumkh gid: i32, 8367b48188Shoumkh /// 设备ID 8467b48188Shoumkh rdev: i64, 8567b48188Shoumkh /// 文件大小 8667b48188Shoumkh size: i64, 8767b48188Shoumkh /// 文件系统块大小 8867b48188Shoumkh blcok_size: i64, 8967b48188Shoumkh /// 分配的512B块数 9067b48188Shoumkh blocks: u64, 9167b48188Shoumkh /// 最后访问时间 9267b48188Shoumkh atime: TimeSpec, 9367b48188Shoumkh /// 最后修改时间 9467b48188Shoumkh mtime: TimeSpec, 9567b48188Shoumkh /// 最后状态变化时间 9667b48188Shoumkh ctime: TimeSpec, 9767b48188Shoumkh /// 用于填充结构体大小的空白数据 9867b48188Shoumkh pub _pad: [i8; 24], 9967b48188Shoumkh } 10067b48188Shoumkh impl PosixKstat { 10167b48188Shoumkh fn new() -> Self { 10267b48188Shoumkh Self { 10367b48188Shoumkh inode: 0, 10467b48188Shoumkh dev_id: 0, 10567b48188Shoumkh mode: ModeType { bits: 0 }, 10667b48188Shoumkh nlink: 0, 10767b48188Shoumkh uid: 0, 10867b48188Shoumkh gid: 0, 10967b48188Shoumkh rdev: 0, 11067b48188Shoumkh size: 0, 11167b48188Shoumkh atime: TimeSpec { 11267b48188Shoumkh tv_sec: 0, 11367b48188Shoumkh tv_nsec: 0, 11467b48188Shoumkh }, 11567b48188Shoumkh mtime: TimeSpec { 11667b48188Shoumkh tv_sec: 0, 11767b48188Shoumkh tv_nsec: 0, 11867b48188Shoumkh }, 11967b48188Shoumkh ctime: TimeSpec { 12067b48188Shoumkh tv_sec: 0, 12167b48188Shoumkh tv_nsec: 0, 12267b48188Shoumkh }, 12367b48188Shoumkh blcok_size: 0, 12467b48188Shoumkh blocks: 0, 12567b48188Shoumkh _pad: Default::default(), 12667b48188Shoumkh } 12767b48188Shoumkh } 12867b48188Shoumkh } 129ab5c8ca4Slogin impl Syscall { 130ab5c8ca4Slogin /// @brief 为当前进程打开一个文件 131ab5c8ca4Slogin /// 132ab5c8ca4Slogin /// @param path 文件路径 133ab5c8ca4Slogin /// @param o_flags 打开文件的标志位 134ab5c8ca4Slogin /// 135ab5c8ca4Slogin /// @return 文件描述符编号,或者是错误码 136ab5c8ca4Slogin pub fn open(path: &str, mode: FileMode) -> Result<usize, SystemError> { 1376d81180bSLoGin // kdebug!("open: path: {}, mode: {:?}", path, mode); 1381496ba7bSLoGin 139ab5c8ca4Slogin // 文件名过长 140ab5c8ca4Slogin if path.len() > PAGE_4K_SIZE as usize { 141ab5c8ca4Slogin return Err(SystemError::ENAMETOOLONG); 142ab5c8ca4Slogin } 143ab5c8ca4Slogin 144ab5c8ca4Slogin let inode: Result<Arc<dyn IndexNode>, SystemError> = ROOT_INODE().lookup(path); 145ab5c8ca4Slogin 146ab5c8ca4Slogin let inode: Arc<dyn IndexNode> = if inode.is_err() { 147ab5c8ca4Slogin let errno = inode.unwrap_err(); 148ab5c8ca4Slogin // 文件不存在,且需要创建 149ab5c8ca4Slogin if mode.contains(FileMode::O_CREAT) 150ab5c8ca4Slogin && !mode.contains(FileMode::O_DIRECTORY) 151ab5c8ca4Slogin && errno == SystemError::ENOENT 152ab5c8ca4Slogin { 153ab5c8ca4Slogin let (filename, parent_path) = rsplit_path(path); 154ab5c8ca4Slogin // 查找父目录 155ab5c8ca4Slogin let parent_inode: Arc<dyn IndexNode> = 156ab5c8ca4Slogin ROOT_INODE().lookup(parent_path.unwrap_or("/"))?; 157ab5c8ca4Slogin // 创建文件 158*6b4e7a29SLoGin let inode: Arc<dyn IndexNode> = parent_inode.create( 159*6b4e7a29SLoGin filename, 160*6b4e7a29SLoGin FileType::File, 161*6b4e7a29SLoGin ModeType::from_bits_truncate(0o755), 162*6b4e7a29SLoGin )?; 163ab5c8ca4Slogin inode 164004e86ffSlogin } else { 165ab5c8ca4Slogin // 不需要创建文件,因此返回错误码 166ab5c8ca4Slogin return Err(errno); 167004e86ffSlogin } 168004e86ffSlogin } else { 169ab5c8ca4Slogin inode.unwrap() 170004e86ffSlogin }; 171004e86ffSlogin 172ab5c8ca4Slogin let file_type: FileType = inode.metadata()?.file_type; 173ab5c8ca4Slogin // 如果要打开的是文件夹,而目标不是文件夹 174ab5c8ca4Slogin if mode.contains(FileMode::O_DIRECTORY) && file_type != FileType::Dir { 175ab5c8ca4Slogin return Err(SystemError::ENOTDIR); 176004e86ffSlogin } 177ab5c8ca4Slogin 178ab5c8ca4Slogin // 如果O_TRUNC,并且,打开模式包含O_RDWR或O_WRONLY,清空文件 179ab5c8ca4Slogin if mode.contains(FileMode::O_TRUNC) 180ab5c8ca4Slogin && (mode.contains(FileMode::O_RDWR) || mode.contains(FileMode::O_WRONLY)) 181ab5c8ca4Slogin && file_type == FileType::File 182ab5c8ca4Slogin { 183ab5c8ca4Slogin inode.truncate(0)?; 184ab5c8ca4Slogin } 185ab5c8ca4Slogin 186ab5c8ca4Slogin // 创建文件对象 187ab5c8ca4Slogin let mut file: File = File::new(inode, mode)?; 188ab5c8ca4Slogin 189ab5c8ca4Slogin // 打开模式为“追加” 190ab5c8ca4Slogin if mode.contains(FileMode::O_APPEND) { 191ab5c8ca4Slogin file.lseek(SeekFrom::SeekEnd(0))?; 192ab5c8ca4Slogin } 193ab5c8ca4Slogin 194ab5c8ca4Slogin // 把文件对象存入pcb 1951496ba7bSLoGin let r = ProcessManager::current_pcb() 1961496ba7bSLoGin .fd_table() 1971496ba7bSLoGin .write() 1981496ba7bSLoGin .alloc_fd(file, None) 1991496ba7bSLoGin .map(|fd| fd as usize); 2001496ba7bSLoGin 2016d81180bSLoGin return r; 202ab5c8ca4Slogin } 203ab5c8ca4Slogin 204ab5c8ca4Slogin /// @brief 关闭文件 205ab5c8ca4Slogin /// 206ab5c8ca4Slogin /// @param fd 文件描述符编号 207ab5c8ca4Slogin /// 208ab5c8ca4Slogin /// @return 成功返回0,失败返回错误码 209ab5c8ca4Slogin pub fn close(fd: usize) -> Result<usize, SystemError> { 2101496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 2111496ba7bSLoGin let mut fd_table_guard = binding.write(); 2121496ba7bSLoGin 2131496ba7bSLoGin return fd_table_guard.drop_fd(fd as i32).map(|_| 0); 214ab5c8ca4Slogin } 215ab5c8ca4Slogin 216ab5c8ca4Slogin /// @brief 根据文件描述符,读取文件数据。尝试读取的数据长度与buf的长度相同。 217ab5c8ca4Slogin /// 218ab5c8ca4Slogin /// @param fd 文件描述符编号 219ab5c8ca4Slogin /// @param buf 输出缓冲区。 220ab5c8ca4Slogin /// 221ab5c8ca4Slogin /// @return Ok(usize) 成功读取的数据的字节数 222ab5c8ca4Slogin /// @return Err(SystemError) 读取失败,返回posix错误码 223ab5c8ca4Slogin pub fn read(fd: i32, buf: &mut [u8]) -> Result<usize, SystemError> { 2241496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 2251496ba7bSLoGin let fd_table_guard = binding.read(); 2261496ba7bSLoGin 2271496ba7bSLoGin let file = fd_table_guard.get_file_by_fd(fd); 228ab5c8ca4Slogin if file.is_none() { 229ab5c8ca4Slogin return Err(SystemError::EBADF); 230ab5c8ca4Slogin } 2311496ba7bSLoGin // drop guard 以避免无法调度的问题 2321496ba7bSLoGin drop(fd_table_guard); 2331496ba7bSLoGin let file = file.unwrap(); 234ab5c8ca4Slogin 2351496ba7bSLoGin return file.lock_no_preempt().read(buf.len(), buf); 236ab5c8ca4Slogin } 237ab5c8ca4Slogin 238ab5c8ca4Slogin /// @brief 根据文件描述符,向文件写入数据。尝试写入的数据长度与buf的长度相同。 239ab5c8ca4Slogin /// 240ab5c8ca4Slogin /// @param fd 文件描述符编号 241ab5c8ca4Slogin /// @param buf 输入缓冲区。 242ab5c8ca4Slogin /// 243ab5c8ca4Slogin /// @return Ok(usize) 成功写入的数据的字节数 244ab5c8ca4Slogin /// @return Err(SystemError) 写入失败,返回posix错误码 245ab5c8ca4Slogin pub fn write(fd: i32, buf: &[u8]) -> Result<usize, SystemError> { 2461496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 2471496ba7bSLoGin let fd_table_guard = binding.read(); 248ab5c8ca4Slogin 2491496ba7bSLoGin let file = fd_table_guard 2501496ba7bSLoGin .get_file_by_fd(fd) 2511496ba7bSLoGin .ok_or(SystemError::EBADF)?; 2521496ba7bSLoGin 2531496ba7bSLoGin // drop guard 以避免无法调度的问题 2541496ba7bSLoGin drop(fd_table_guard); 2551496ba7bSLoGin return file.lock_no_preempt().write(buf.len(), buf); 256ab5c8ca4Slogin } 257ab5c8ca4Slogin 258ab5c8ca4Slogin /// @brief 调整文件操作指针的位置 259ab5c8ca4Slogin /// 260ab5c8ca4Slogin /// @param fd 文件描述符编号 261ab5c8ca4Slogin /// @param seek 调整的方式 262ab5c8ca4Slogin /// 263ab5c8ca4Slogin /// @return Ok(usize) 调整后,文件访问指针相对于文件头部的偏移量 264ab5c8ca4Slogin /// @return Err(SystemError) 调整失败,返回posix错误码 265ab5c8ca4Slogin pub fn lseek(fd: i32, seek: SeekFrom) -> Result<usize, SystemError> { 2661496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 2671496ba7bSLoGin let fd_table_guard = binding.read(); 2681496ba7bSLoGin let file = fd_table_guard 2691496ba7bSLoGin .get_file_by_fd(fd) 2701496ba7bSLoGin .ok_or(SystemError::EBADF)?; 2711496ba7bSLoGin 2721496ba7bSLoGin // drop guard 以避免无法调度的问题 2731496ba7bSLoGin drop(fd_table_guard); 2741496ba7bSLoGin return file.lock_no_preempt().lseek(seek); 275004e86ffSlogin } 276004e86ffSlogin 277004e86ffSlogin /// @brief 切换工作目录 278004e86ffSlogin /// 279004e86ffSlogin /// @param dest_path 目标路径 280004e86ffSlogin /// 281004e86ffSlogin /// @return 返回码 描述 282004e86ffSlogin /// 0 | 成功 283004e86ffSlogin /// 284004e86ffSlogin /// EACCESS | 权限不足 285004e86ffSlogin /// 286004e86ffSlogin /// ELOOP | 解析path时遇到路径循环 287004e86ffSlogin /// 288004e86ffSlogin /// ENAMETOOLONG | 路径名过长 289004e86ffSlogin /// 290004e86ffSlogin /// ENOENT | 目标文件或目录不存在 291004e86ffSlogin /// 292004e86ffSlogin /// ENODIR | 检索期间发现非目录项 293004e86ffSlogin /// 294004e86ffSlogin /// ENOMEM | 系统内存不足 295004e86ffSlogin /// 296004e86ffSlogin /// EFAULT | 错误的地址 297004e86ffSlogin /// 298004e86ffSlogin /// ENAMETOOLONG | 路径过长 299ab5c8ca4Slogin pub fn chdir(dest_path: &str) -> Result<usize, SystemError> { 3001496ba7bSLoGin let proc = ProcessManager::current_pcb(); 301ab5c8ca4Slogin // Copy path to kernel space to avoid some security issues 3021496ba7bSLoGin let path = dest_path.to_string(); 3031496ba7bSLoGin let mut new_path = String::from(""); 3041496ba7bSLoGin if path.len() > 0 { 3051496ba7bSLoGin let cwd = match path.as_bytes()[0] { 3061496ba7bSLoGin b'/' => String::from("/"), 3071496ba7bSLoGin _ => proc.basic().cwd(), 3081496ba7bSLoGin }; 3091496ba7bSLoGin let mut cwd_vec: Vec<_> = cwd.split("/").filter(|&x| x != "").collect(); 3101496ba7bSLoGin let path_split = path.split("/").filter(|&x| x != ""); 3111496ba7bSLoGin for seg in path_split { 3121496ba7bSLoGin if seg == ".." { 3131496ba7bSLoGin cwd_vec.pop(); 3141496ba7bSLoGin } else if seg == "." { 3151496ba7bSLoGin // 当前目录 3161496ba7bSLoGin } else { 3171496ba7bSLoGin cwd_vec.push(seg); 3181496ba7bSLoGin } 3191496ba7bSLoGin } 3201496ba7bSLoGin //proc.basic().set_path(String::from("")); 3211496ba7bSLoGin for seg in cwd_vec { 3221496ba7bSLoGin new_path.push_str("/"); 3231496ba7bSLoGin new_path.push_str(seg); 3241496ba7bSLoGin } 3251496ba7bSLoGin if new_path == "" { 3261496ba7bSLoGin new_path = String::from("/"); 3271496ba7bSLoGin } 3281496ba7bSLoGin } 3291496ba7bSLoGin let inode = match ROOT_INODE().lookup(&new_path) { 330004e86ffSlogin Err(e) => { 331676b8ef6SMork kerror!("Change Directory Failed, Error = {:?}", e); 332ab5c8ca4Slogin return Err(SystemError::ENOENT); 333004e86ffSlogin } 334004e86ffSlogin Ok(i) => i, 335004e86ffSlogin }; 3361496ba7bSLoGin let metadata = inode.metadata()?; 3371496ba7bSLoGin if metadata.file_type == FileType::Dir { 3381496ba7bSLoGin proc.basic_mut().set_cwd(String::from(new_path)); 339ab5c8ca4Slogin return Ok(0); 340004e86ffSlogin } else { 341ab5c8ca4Slogin return Err(SystemError::ENOTDIR); 342004e86ffSlogin } 343004e86ffSlogin } 3441496ba7bSLoGin 3451496ba7bSLoGin /// @brief 获取当前进程的工作目录路径 3461496ba7bSLoGin /// 3471496ba7bSLoGin /// @param buf 指向缓冲区的指针 3481496ba7bSLoGin /// @param size 缓冲区的大小 3491496ba7bSLoGin /// 3501496ba7bSLoGin /// @return 成功,返回的指针指向包含工作目录路径的字符串 3511496ba7bSLoGin /// @return 错误,没有足够的空间 3521496ba7bSLoGin pub fn getcwd(buf: &mut [u8]) -> Result<VirtAddr, SystemError> { 3531496ba7bSLoGin let proc = ProcessManager::current_pcb(); 3541496ba7bSLoGin let cwd = proc.basic().cwd(); 3551496ba7bSLoGin 3561496ba7bSLoGin let cwd_bytes = cwd.as_bytes(); 3571496ba7bSLoGin let cwd_len = cwd_bytes.len(); 3581496ba7bSLoGin if cwd_len + 1 > buf.len() { 3591496ba7bSLoGin return Err(SystemError::ENOMEM); 360004e86ffSlogin } 3611496ba7bSLoGin buf[..cwd_len].copy_from_slice(cwd_bytes); 3621496ba7bSLoGin buf[cwd_len] = 0; 3631496ba7bSLoGin 3641496ba7bSLoGin return Ok(VirtAddr::new(buf.as_ptr() as usize)); 365004e86ffSlogin } 366004e86ffSlogin 367004e86ffSlogin /// @brief 获取目录中的数据 368004e86ffSlogin /// 369ab5c8ca4Slogin /// TODO: 这个函数的语义与Linux不一致,需要修改!!! 370ab5c8ca4Slogin /// 371004e86ffSlogin /// @param fd 文件描述符号 372ab5c8ca4Slogin /// @param buf 输出缓冲区 373ab5c8ca4Slogin /// 374ab5c8ca4Slogin /// @return 成功返回读取的字节数,失败返回错误码 375ab5c8ca4Slogin pub fn getdents(fd: i32, buf: &mut [u8]) -> Result<usize, SystemError> { 376ab5c8ca4Slogin let dirent = 377ab5c8ca4Slogin unsafe { (buf.as_mut_ptr() as *mut Dirent).as_mut() }.ok_or(SystemError::EFAULT)?; 378004e86ffSlogin 379004e86ffSlogin if fd < 0 || fd as u32 > PROC_MAX_FD_NUM { 380ab5c8ca4Slogin return Err(SystemError::EBADF); 381004e86ffSlogin } 382004e86ffSlogin 383004e86ffSlogin // 获取fd 3841496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 3851496ba7bSLoGin let fd_table_guard = binding.read(); 3861496ba7bSLoGin let file = fd_table_guard 3871496ba7bSLoGin .get_file_by_fd(fd) 3881496ba7bSLoGin .ok_or(SystemError::EBADF)?; 389004e86ffSlogin 3901496ba7bSLoGin // drop guard 以避免无法调度的问题 3911496ba7bSLoGin drop(fd_table_guard); 3921496ba7bSLoGin return file.lock_no_preempt().readdir(dirent).map(|x| x as usize); 393004e86ffSlogin } 394004e86ffSlogin 395004e86ffSlogin /// @brief 创建文件夹 396004e86ffSlogin /// 397004e86ffSlogin /// @param path(r8) 路径 / mode(r9) 模式 398004e86ffSlogin /// 399004e86ffSlogin /// @return uint64_t 负数错误码 / 0表示成功 400ab5c8ca4Slogin pub fn mkdir(path: &str, mode: usize) -> Result<usize, SystemError> { 401ab5c8ca4Slogin return do_mkdir(path, FileMode::from_bits_truncate(mode as u32)).map(|x| x as usize); 402004e86ffSlogin } 403004e86ffSlogin 404ab5c8ca4Slogin /// **删除文件夹、取消文件的链接、删除文件的系统调用** 405004e86ffSlogin /// 406ab5c8ca4Slogin /// ## 参数 407004e86ffSlogin /// 408ab5c8ca4Slogin /// - `dirfd`:文件夹的文件描述符.目前暂未实现 409ab5c8ca4Slogin /// - `pathname`:文件夹的路径 410ab5c8ca4Slogin /// - `flags`:标志位 411004e86ffSlogin /// 412004e86ffSlogin /// 413ab5c8ca4Slogin pub fn unlinkat(_dirfd: i32, pathname: &str, flags: u32) -> Result<usize, SystemError> { 414004e86ffSlogin // kdebug!("sys_unlink_at={path:?}"); 415ab5c8ca4Slogin if (flags & (!AT_REMOVEDIR)) != 0 { 416ab5c8ca4Slogin return Err(SystemError::EINVAL); 417004e86ffSlogin } 418004e86ffSlogin 419ab5c8ca4Slogin if (flags & AT_REMOVEDIR) > 0 { 420004e86ffSlogin // kdebug!("rmdir"); 421ab5c8ca4Slogin match do_remove_dir(&pathname) { 422004e86ffSlogin Err(err) => { 423676b8ef6SMork kerror!("Failed to Remove Directory, Error Code = {:?}", err); 424ab5c8ca4Slogin return Err(err); 425004e86ffSlogin } 426004e86ffSlogin Ok(_) => { 427ab5c8ca4Slogin return Ok(0); 428004e86ffSlogin } 429004e86ffSlogin } 430004e86ffSlogin } 431004e86ffSlogin 432ab5c8ca4Slogin match do_unlink_at(&pathname, FileMode::from_bits_truncate(flags as u32)) { 433004e86ffSlogin Err(err) => { 434676b8ef6SMork kerror!("Failed to Remove Directory, Error Code = {:?}", err); 435ab5c8ca4Slogin return Err(err); 436004e86ffSlogin } 437004e86ffSlogin Ok(_) => { 438ab5c8ca4Slogin return Ok(0); 439004e86ffSlogin } 440004e86ffSlogin } 441004e86ffSlogin } 4422b771e32SGou Ngai 443ab5c8ca4Slogin /// @brief 根据提供的文件描述符的fd,复制对应的文件结构体,并返回新复制的文件结构体对应的fd 444ab5c8ca4Slogin pub fn dup(oldfd: i32) -> Result<usize, SystemError> { 4451496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 4461496ba7bSLoGin let mut fd_table_guard = binding.write(); 447ab5c8ca4Slogin 4481496ba7bSLoGin let old_file = fd_table_guard 4491496ba7bSLoGin .get_file_by_fd(oldfd) 4501496ba7bSLoGin .ok_or(SystemError::EBADF)?; 4511496ba7bSLoGin 4521496ba7bSLoGin let new_file = old_file 4531496ba7bSLoGin .lock_no_preempt() 4541496ba7bSLoGin .try_clone() 4551496ba7bSLoGin .ok_or(SystemError::EBADF)?; 4562b771e32SGou Ngai // 申请文件描述符,并把文件对象存入其中 4571496ba7bSLoGin let res = fd_table_guard.alloc_fd(new_file, None).map(|x| x as usize); 4582b771e32SGou Ngai return res; 4592b771e32SGou Ngai } 4602b771e32SGou Ngai 461ab5c8ca4Slogin /// 根据提供的文件描述符的fd,和指定新fd,复制对应的文件结构体, 462ab5c8ca4Slogin /// 并返回新复制的文件结构体对应的fd. 463ab5c8ca4Slogin /// 如果新fd已经打开,则会先关闭新fd. 464ab5c8ca4Slogin /// 465ab5c8ca4Slogin /// ## 参数 466ab5c8ca4Slogin /// 467ab5c8ca4Slogin /// - `oldfd`:旧文件描述符 468ab5c8ca4Slogin /// - `newfd`:新文件描述符 469ab5c8ca4Slogin /// 470ab5c8ca4Slogin /// ## 返回值 471ab5c8ca4Slogin /// 472ab5c8ca4Slogin /// - 成功:新文件描述符 473ab5c8ca4Slogin /// - 失败:错误码 474ab5c8ca4Slogin pub fn dup2(oldfd: i32, newfd: i32) -> Result<usize, SystemError> { 4751496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 4761496ba7bSLoGin let mut fd_table_guard = binding.write(); 4771496ba7bSLoGin return Self::do_dup2(oldfd, newfd, &mut fd_table_guard); 4781496ba7bSLoGin } 4791496ba7bSLoGin 4801496ba7bSLoGin fn do_dup2( 4811496ba7bSLoGin oldfd: i32, 4821496ba7bSLoGin newfd: i32, 4831496ba7bSLoGin fd_table_guard: &mut RwLockWriteGuard<'_, FileDescriptorVec>, 4841496ba7bSLoGin ) -> Result<usize, SystemError> { 4852b771e32SGou Ngai // 确认oldfd, newid是否有效 4861496ba7bSLoGin if !(FileDescriptorVec::validate_fd(oldfd) && FileDescriptorVec::validate_fd(newfd)) { 4871496ba7bSLoGin return Err(SystemError::EBADF); 4881496ba7bSLoGin } 4891496ba7bSLoGin 4902b771e32SGou Ngai if oldfd == newfd { 4912b771e32SGou Ngai // 若oldfd与newfd相等 492ab5c8ca4Slogin return Ok(newfd as usize); 4932b771e32SGou Ngai } 4941496ba7bSLoGin let new_exists = fd_table_guard.get_file_by_fd(newfd).is_some(); 4951496ba7bSLoGin if new_exists { 4962b771e32SGou Ngai // close newfd 4971496ba7bSLoGin if let Err(_) = fd_table_guard.drop_fd(newfd) { 4982b771e32SGou Ngai // An I/O error occurred while attempting to close fildes2. 4992b771e32SGou Ngai return Err(SystemError::EIO); 5002b771e32SGou Ngai } 5012b771e32SGou Ngai } 5022b771e32SGou Ngai 5031496ba7bSLoGin let old_file = fd_table_guard 5041496ba7bSLoGin .get_file_by_fd(oldfd) 5051496ba7bSLoGin .ok_or(SystemError::EBADF)?; 5061496ba7bSLoGin let new_file = old_file 5071496ba7bSLoGin .lock_no_preempt() 5081496ba7bSLoGin .try_clone() 5091496ba7bSLoGin .ok_or(SystemError::EBADF)?; 5102b771e32SGou Ngai // 申请文件描述符,并把文件对象存入其中 5111496ba7bSLoGin let res = fd_table_guard 5121496ba7bSLoGin .alloc_fd(new_file, Some(newfd)) 513ab5c8ca4Slogin .map(|x| x as usize); 5142b771e32SGou Ngai return res; 5152b771e32SGou Ngai } 5166d81180bSLoGin 5176d81180bSLoGin /// # fcntl 5186d81180bSLoGin /// 5196d81180bSLoGin /// ## 参数 5206d81180bSLoGin /// 5216d81180bSLoGin /// - `fd`:文件描述符 5226d81180bSLoGin /// - `cmd`:命令 5236d81180bSLoGin /// - `arg`:参数 5246d81180bSLoGin pub fn fcntl(fd: i32, cmd: FcntlCommand, arg: i32) -> Result<usize, SystemError> { 5256d81180bSLoGin match cmd { 5266d81180bSLoGin FcntlCommand::DupFd => { 5276d81180bSLoGin if arg < 0 || arg as usize >= FileDescriptorVec::PROCESS_MAX_FD { 5286d81180bSLoGin return Err(SystemError::EBADF); 5296d81180bSLoGin } 5306d81180bSLoGin let arg = arg as usize; 5316d81180bSLoGin for i in arg..FileDescriptorVec::PROCESS_MAX_FD { 5321496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5331496ba7bSLoGin let mut fd_table_guard = binding.write(); 5341496ba7bSLoGin if fd_table_guard.get_file_by_fd(fd).is_none() { 5351496ba7bSLoGin return Self::do_dup2(fd, i as i32, &mut fd_table_guard); 5366d81180bSLoGin } 5376d81180bSLoGin } 5386d81180bSLoGin return Err(SystemError::EMFILE); 5396d81180bSLoGin } 5406d81180bSLoGin FcntlCommand::GetFd => { 5416d81180bSLoGin // Get file descriptor flags. 5421496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5431496ba7bSLoGin let fd_table_guard = binding.read(); 5441496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 5451496ba7bSLoGin // drop guard 以避免无法调度的问题 5461496ba7bSLoGin drop(fd_table_guard); 5476d81180bSLoGin 5481496ba7bSLoGin if file.lock().close_on_exec() { 5496d81180bSLoGin return Ok(FD_CLOEXEC as usize); 5506d81180bSLoGin } 5516d81180bSLoGin } 5526d81180bSLoGin return Err(SystemError::EBADF); 5536d81180bSLoGin } 5546d81180bSLoGin FcntlCommand::SetFd => { 5556d81180bSLoGin // Set file descriptor flags. 5561496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5571496ba7bSLoGin let fd_table_guard = binding.write(); 5581496ba7bSLoGin 5591496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 5601496ba7bSLoGin // drop guard 以避免无法调度的问题 5611496ba7bSLoGin drop(fd_table_guard); 5626d81180bSLoGin let arg = arg as u32; 5636d81180bSLoGin if arg & FD_CLOEXEC != 0 { 5641496ba7bSLoGin file.lock().set_close_on_exec(true); 5656d81180bSLoGin } else { 5661496ba7bSLoGin file.lock().set_close_on_exec(false); 5676d81180bSLoGin } 5686d81180bSLoGin return Ok(0); 5696d81180bSLoGin } 5706d81180bSLoGin return Err(SystemError::EBADF); 5716d81180bSLoGin } 5726d81180bSLoGin 5736d81180bSLoGin FcntlCommand::GetFlags => { 5746d81180bSLoGin // Get file status flags. 5751496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5761496ba7bSLoGin let fd_table_guard = binding.read(); 5771496ba7bSLoGin 5781496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 5791496ba7bSLoGin // drop guard 以避免无法调度的问题 5801496ba7bSLoGin drop(fd_table_guard); 5811496ba7bSLoGin return Ok(file.lock_no_preempt().mode().bits() as usize); 5826d81180bSLoGin } 5831496ba7bSLoGin 5846d81180bSLoGin return Err(SystemError::EBADF); 5856d81180bSLoGin } 5866d81180bSLoGin FcntlCommand::SetFlags => { 5876d81180bSLoGin // Set file status flags. 5881496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5891496ba7bSLoGin let fd_table_guard = binding.write(); 5901496ba7bSLoGin 5911496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 5926d81180bSLoGin let arg = arg as u32; 5936d81180bSLoGin let mode = FileMode::from_bits(arg).ok_or(SystemError::EINVAL)?; 5941496ba7bSLoGin // drop guard 以避免无法调度的问题 5951496ba7bSLoGin drop(fd_table_guard); 5961496ba7bSLoGin file.lock_no_preempt().set_mode(mode)?; 5976d81180bSLoGin return Ok(0); 5986d81180bSLoGin } 5991496ba7bSLoGin 6006d81180bSLoGin return Err(SystemError::EBADF); 6016d81180bSLoGin } 6026d81180bSLoGin _ => { 6036d81180bSLoGin // TODO: unimplemented 6046d81180bSLoGin // 未实现的命令,返回0,不报错。 6056d81180bSLoGin 6066d81180bSLoGin // kwarn!("fcntl: unimplemented command: {:?}, defaults to 0.", cmd); 6076d81180bSLoGin return Ok(0); 6086d81180bSLoGin } 6096d81180bSLoGin } 6106d81180bSLoGin } 6116d81180bSLoGin 6126d81180bSLoGin /// # ftruncate 6136d81180bSLoGin /// 6146d81180bSLoGin /// ## 描述 6156d81180bSLoGin /// 6166d81180bSLoGin /// 改变文件大小. 6176d81180bSLoGin /// 如果文件大小大于原来的大小,那么文件的内容将会被扩展到指定的大小,新的空间将会用0填充. 6186d81180bSLoGin /// 如果文件大小小于原来的大小,那么文件的内容将会被截断到指定的大小. 6196d81180bSLoGin /// 6206d81180bSLoGin /// ## 参数 6216d81180bSLoGin /// 6226d81180bSLoGin /// - `fd`:文件描述符 6236d81180bSLoGin /// - `len`:文件大小 6246d81180bSLoGin /// 6256d81180bSLoGin /// ## 返回值 6266d81180bSLoGin /// 6276d81180bSLoGin /// 如果成功,返回0,否则返回错误码. 6286d81180bSLoGin pub fn ftruncate(fd: i32, len: usize) -> Result<usize, SystemError> { 6291496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 6301496ba7bSLoGin let fd_table_guard = binding.read(); 6311496ba7bSLoGin 6321496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 6331496ba7bSLoGin // drop guard 以避免无法调度的问题 6341496ba7bSLoGin drop(fd_table_guard); 6351496ba7bSLoGin let r = file.lock_no_preempt().ftruncate(len).map(|_| 0); 6366d81180bSLoGin return r; 6376d81180bSLoGin } 6381496ba7bSLoGin 6396d81180bSLoGin return Err(SystemError::EBADF); 6406d81180bSLoGin } 6411496ba7bSLoGin 64267b48188Shoumkh fn do_fstat(fd: i32) -> Result<PosixKstat, SystemError> { 6431496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 6441496ba7bSLoGin let fd_table_guard = binding.read(); 6451496ba7bSLoGin let file = fd_table_guard 6461496ba7bSLoGin .get_file_by_fd(fd) 6471496ba7bSLoGin .ok_or(SystemError::EBADF)?; 6481496ba7bSLoGin // drop guard 以避免无法调度的问题 6491496ba7bSLoGin drop(fd_table_guard); 6501496ba7bSLoGin 65167b48188Shoumkh let mut kstat = PosixKstat::new(); 65267b48188Shoumkh // 获取文件信息 6531496ba7bSLoGin let metadata = file.lock().metadata()?; 65467b48188Shoumkh kstat.size = metadata.size as i64; 65567b48188Shoumkh kstat.dev_id = metadata.dev_id as u64; 656*6b4e7a29SLoGin kstat.inode = metadata.inode_id.into() as u64; 65767b48188Shoumkh kstat.blcok_size = metadata.blk_size as i64; 65867b48188Shoumkh kstat.blocks = metadata.blocks as u64; 65967b48188Shoumkh 66067b48188Shoumkh kstat.atime.tv_sec = metadata.atime.tv_sec; 66167b48188Shoumkh kstat.atime.tv_nsec = metadata.atime.tv_nsec; 66267b48188Shoumkh kstat.mtime.tv_sec = metadata.mtime.tv_sec; 66367b48188Shoumkh kstat.mtime.tv_nsec = metadata.mtime.tv_nsec; 66467b48188Shoumkh kstat.ctime.tv_sec = metadata.ctime.tv_sec; 66567b48188Shoumkh kstat.ctime.tv_nsec = metadata.ctime.tv_nsec; 66667b48188Shoumkh 66767b48188Shoumkh kstat.nlink = metadata.nlinks as u64; 66867b48188Shoumkh kstat.uid = metadata.uid as i32; 66967b48188Shoumkh kstat.gid = metadata.gid as i32; 67067b48188Shoumkh kstat.rdev = metadata.raw_dev as i64; 671*6b4e7a29SLoGin kstat.mode = metadata.mode; 6721496ba7bSLoGin match file.lock().file_type() { 67367b48188Shoumkh FileType::File => kstat.mode.insert(ModeType::S_IFMT), 67467b48188Shoumkh FileType::Dir => kstat.mode.insert(ModeType::S_IFDIR), 67567b48188Shoumkh FileType::BlockDevice => kstat.mode.insert(ModeType::S_IFBLK), 67667b48188Shoumkh FileType::CharDevice => kstat.mode.insert(ModeType::S_IFCHR), 67767b48188Shoumkh FileType::SymLink => kstat.mode.insert(ModeType::S_IFLNK), 67867b48188Shoumkh FileType::Socket => kstat.mode.insert(ModeType::S_IFSOCK), 67967b48188Shoumkh FileType::Pipe => kstat.mode.insert(ModeType::S_IFIFO), 68067b48188Shoumkh } 68167b48188Shoumkh 68267b48188Shoumkh return Ok(kstat); 68367b48188Shoumkh } 6841496ba7bSLoGin 68567b48188Shoumkh pub fn fstat(fd: i32, usr_kstat: *mut PosixKstat) -> Result<usize, SystemError> { 6861496ba7bSLoGin let kstat = Self::do_fstat(fd)?; 68767b48188Shoumkh if usr_kstat.is_null() { 68867b48188Shoumkh return Err(SystemError::EFAULT); 68967b48188Shoumkh } 69067b48188Shoumkh unsafe { 69167b48188Shoumkh *usr_kstat = kstat; 69267b48188Shoumkh } 69367b48188Shoumkh return Ok(0); 69467b48188Shoumkh } 69567b48188Shoumkh } 696cde5492fSlogin #[repr(C)] 697cde5492fSlogin #[derive(Debug, Clone, Copy)] 698cde5492fSlogin pub struct IoVec { 699cde5492fSlogin /// 缓冲区的起始地址 700cde5492fSlogin pub iov_base: *mut u8, 701cde5492fSlogin /// 缓冲区的长度 702cde5492fSlogin pub iov_len: usize, 703cde5492fSlogin } 704cde5492fSlogin 705cde5492fSlogin /// 用于存储多个来自用户空间的IoVec 706cde5492fSlogin /// 707cde5492fSlogin /// 由于目前内核中的文件系统还不支持分散读写,所以暂时只支持将用户空间的IoVec聚合成一个缓冲区,然后进行操作。 708cde5492fSlogin /// TODO:支持分散读写 709cde5492fSlogin #[derive(Debug)] 710cde5492fSlogin pub struct IoVecs(Vec<&'static mut [u8]>); 711cde5492fSlogin 712cde5492fSlogin impl IoVecs { 713cde5492fSlogin /// 从用户空间的IoVec中构造IoVecs 714cde5492fSlogin /// 715cde5492fSlogin /// @param iov 用户空间的IoVec 716cde5492fSlogin /// @param iovcnt 用户空间的IoVec的数量 717cde5492fSlogin /// @param readv 是否为readv系统调用 718cde5492fSlogin /// 719cde5492fSlogin /// @return 构造成功返回IoVecs,否则返回错误码 720cde5492fSlogin pub unsafe fn from_user( 721cde5492fSlogin iov: *const IoVec, 722cde5492fSlogin iovcnt: usize, 723cde5492fSlogin _readv: bool, 724cde5492fSlogin ) -> Result<Self, SystemError> { 725cde5492fSlogin // 检查iov指针所在空间是否合法 726cde5492fSlogin if !verify_area( 727cde5492fSlogin iov as usize as u64, 728cde5492fSlogin (iovcnt * core::mem::size_of::<IoVec>()) as u64, 729cde5492fSlogin ) { 730cde5492fSlogin return Err(SystemError::EFAULT); 731cde5492fSlogin } 732cde5492fSlogin 733cde5492fSlogin // 将用户空间的IoVec转换为引用(注意:这里的引用是静态的,因为用户空间的IoVec不会被释放) 734cde5492fSlogin let iovs: &[IoVec] = core::slice::from_raw_parts(iov, iovcnt); 735cde5492fSlogin 736cde5492fSlogin let mut slices: Vec<&mut [u8]> = vec![]; 737cde5492fSlogin slices.reserve(iovs.len()); 738cde5492fSlogin 739cde5492fSlogin for iov in iovs.iter() { 740cde5492fSlogin if iov.iov_len == 0 { 741cde5492fSlogin continue; 742cde5492fSlogin } 743cde5492fSlogin 744cde5492fSlogin if !verify_area(iov.iov_base as usize as u64, iov.iov_len as u64) { 745cde5492fSlogin return Err(SystemError::EFAULT); 746cde5492fSlogin } 747cde5492fSlogin 748cde5492fSlogin slices.push(core::slice::from_raw_parts_mut(iov.iov_base, iov.iov_len)); 749cde5492fSlogin } 750cde5492fSlogin 751cde5492fSlogin return Ok(Self(slices)); 752cde5492fSlogin } 753cde5492fSlogin 754cde5492fSlogin /// @brief 将IoVecs中的数据聚合到一个缓冲区中 755cde5492fSlogin /// 756cde5492fSlogin /// @return 返回聚合后的缓冲区 757cde5492fSlogin pub fn gather(&self) -> Vec<u8> { 758cde5492fSlogin let mut buf = Vec::new(); 759cde5492fSlogin for slice in self.0.iter() { 760cde5492fSlogin buf.extend_from_slice(slice); 761cde5492fSlogin } 762cde5492fSlogin return buf; 763cde5492fSlogin } 764cde5492fSlogin 765cde5492fSlogin /// @brief 将给定的数据分散写入到IoVecs中 766cde5492fSlogin pub fn scatter(&mut self, data: &[u8]) { 767cde5492fSlogin let mut data: &[u8] = data; 768cde5492fSlogin for slice in self.0.iter_mut() { 769cde5492fSlogin let len = core::cmp::min(slice.len(), data.len()); 770cde5492fSlogin if len == 0 { 771cde5492fSlogin continue; 772cde5492fSlogin } 773cde5492fSlogin 774cde5492fSlogin slice[..len].copy_from_slice(&data[..len]); 775cde5492fSlogin data = &data[len..]; 776cde5492fSlogin } 777cde5492fSlogin } 778cde5492fSlogin 779cde5492fSlogin /// @brief 创建与IoVecs等长的缓冲区 780cde5492fSlogin /// 781cde5492fSlogin /// @param set_len 是否设置返回的Vec的len。 782cde5492fSlogin /// 如果为true,则返回的Vec的len为所有IoVec的长度之和; 783cde5492fSlogin /// 否则返回的Vec的len为0,capacity为所有IoVec的长度之和. 784cde5492fSlogin /// 785cde5492fSlogin /// @return 返回创建的缓冲区 786cde5492fSlogin pub fn new_buf(&self, set_len: bool) -> Vec<u8> { 787cde5492fSlogin let total_len: usize = self.0.iter().map(|slice| slice.len()).sum(); 788cde5492fSlogin let mut buf: Vec<u8> = Vec::with_capacity(total_len); 789cde5492fSlogin 790cde5492fSlogin if set_len { 7917ae679ddSLoGin buf.resize(total_len, 0); 792cde5492fSlogin } 793cde5492fSlogin return buf; 794cde5492fSlogin } 795cde5492fSlogin } 796