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 346b4e7a29SLoGin #[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 1586b4e7a29SLoGin let inode: Arc<dyn IndexNode> = parent_inode.create( 1596b4e7a29SLoGin filename, 1606b4e7a29SLoGin FileType::File, 1616b4e7a29SLoGin ModeType::from_bits_truncate(0o755), 1626b4e7a29SLoGin )?; 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 187*34e6d6c8Syuyi2439 188ab5c8ca4Slogin let mut file: File = File::new(inode, mode)?; 189ab5c8ca4Slogin 190ab5c8ca4Slogin // 打开模式为“追加” 191ab5c8ca4Slogin if mode.contains(FileMode::O_APPEND) { 192ab5c8ca4Slogin file.lseek(SeekFrom::SeekEnd(0))?; 193ab5c8ca4Slogin } 194ab5c8ca4Slogin 195ab5c8ca4Slogin // 把文件对象存入pcb 1961496ba7bSLoGin let r = ProcessManager::current_pcb() 1971496ba7bSLoGin .fd_table() 1981496ba7bSLoGin .write() 1991496ba7bSLoGin .alloc_fd(file, None) 2001496ba7bSLoGin .map(|fd| fd as usize); 2011496ba7bSLoGin 2026d81180bSLoGin return r; 203ab5c8ca4Slogin } 204ab5c8ca4Slogin 205ab5c8ca4Slogin /// @brief 关闭文件 206ab5c8ca4Slogin /// 207ab5c8ca4Slogin /// @param fd 文件描述符编号 208ab5c8ca4Slogin /// 209ab5c8ca4Slogin /// @return 成功返回0,失败返回错误码 210ab5c8ca4Slogin pub fn close(fd: usize) -> Result<usize, SystemError> { 2111496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 2121496ba7bSLoGin let mut fd_table_guard = binding.write(); 2131496ba7bSLoGin 214*34e6d6c8Syuyi2439 let res = fd_table_guard.drop_fd(fd as i32).map(|_| 0); 215*34e6d6c8Syuyi2439 216*34e6d6c8Syuyi2439 return res; 217ab5c8ca4Slogin } 218ab5c8ca4Slogin 219ab5c8ca4Slogin /// @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。 220ab5c8ca4Slogin /// 221ab5c8ca4Slogin /// @param fd 文件描述符编号 222ab5c8ca4Slogin /// @param buf 输出缓冲区。 223ab5c8ca4Slogin /// 224ab5c8ca4Slogin /// @return Ok(usize) 成功读取的数据的字节数 225ab5c8ca4Slogin /// @return Err(SystemError) 读取失败,返回posix错误码 226ab5c8ca4Slogin pub fn read(fd: i32, buf: &mut [u8]) -> Result<usize, SystemError> { 2271496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 2281496ba7bSLoGin let fd_table_guard = binding.read(); 2291496ba7bSLoGin 2301496ba7bSLoGin let file = fd_table_guard.get_file_by_fd(fd); 231ab5c8ca4Slogin if file.is_none() { 232ab5c8ca4Slogin return Err(SystemError::EBADF); 233ab5c8ca4Slogin } 2341496ba7bSLoGin // drop guard 以避免无法调度的问题 2351496ba7bSLoGin drop(fd_table_guard); 2361496ba7bSLoGin let file = file.unwrap(); 237ab5c8ca4Slogin 2381496ba7bSLoGin return file.lock_no_preempt().read(buf.len(), buf); 239ab5c8ca4Slogin } 240ab5c8ca4Slogin 241ab5c8ca4Slogin /// @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。 242ab5c8ca4Slogin /// 243ab5c8ca4Slogin /// @param fd 文件描述符编号 244ab5c8ca4Slogin /// @param buf 输入缓冲区。 245ab5c8ca4Slogin /// 246ab5c8ca4Slogin /// @return Ok(usize) 成功写入的数据的字节数 247ab5c8ca4Slogin /// @return Err(SystemError) 写入失败,返回posix错误码 248ab5c8ca4Slogin pub fn write(fd: i32, buf: &[u8]) -> Result<usize, SystemError> { 2491496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 2501496ba7bSLoGin let fd_table_guard = binding.read(); 251ab5c8ca4Slogin 2521496ba7bSLoGin let file = fd_table_guard 2531496ba7bSLoGin .get_file_by_fd(fd) 2541496ba7bSLoGin .ok_or(SystemError::EBADF)?; 2551496ba7bSLoGin 2561496ba7bSLoGin // drop guard 以避免无法调度的问题 2571496ba7bSLoGin drop(fd_table_guard); 2581496ba7bSLoGin return file.lock_no_preempt().write(buf.len(), buf); 259ab5c8ca4Slogin } 260ab5c8ca4Slogin 261ab5c8ca4Slogin /// @brief 调整文件操作指针的位置 262ab5c8ca4Slogin /// 263ab5c8ca4Slogin /// @param fd 文件描述符编号 264ab5c8ca4Slogin /// @param seek 调整的方式 265ab5c8ca4Slogin /// 266ab5c8ca4Slogin /// @return Ok(usize) 调整后,文件访问指针相对于文件头部的偏移量 267ab5c8ca4Slogin /// @return Err(SystemError) 调整失败,返回posix错误码 268ab5c8ca4Slogin pub fn lseek(fd: i32, seek: SeekFrom) -> Result<usize, SystemError> { 2691496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 2701496ba7bSLoGin let fd_table_guard = binding.read(); 2711496ba7bSLoGin let file = fd_table_guard 2721496ba7bSLoGin .get_file_by_fd(fd) 2731496ba7bSLoGin .ok_or(SystemError::EBADF)?; 2741496ba7bSLoGin 2751496ba7bSLoGin // drop guard 以避免无法调度的问题 2761496ba7bSLoGin drop(fd_table_guard); 2771496ba7bSLoGin return file.lock_no_preempt().lseek(seek); 278004e86ffSlogin } 279004e86ffSlogin 280004e86ffSlogin /// @brief 切换工作目录 281004e86ffSlogin /// 282004e86ffSlogin /// @param dest_path 目标路径 283004e86ffSlogin /// 284004e86ffSlogin /// @return 返回码 描述 285004e86ffSlogin /// 0 | 成功 286004e86ffSlogin /// 287004e86ffSlogin /// EACCESS | 权限不足 288004e86ffSlogin /// 289004e86ffSlogin /// ELOOP | 解析path时遇到路径循环 290004e86ffSlogin /// 291004e86ffSlogin /// ENAMETOOLONG | 路径名过长 292004e86ffSlogin /// 293004e86ffSlogin /// ENOENT | 目标文件或目录不存在 294004e86ffSlogin /// 295004e86ffSlogin /// ENODIR | 检索期间发现非目录项 296004e86ffSlogin /// 297004e86ffSlogin /// ENOMEM | 系统内存不足 298004e86ffSlogin /// 299004e86ffSlogin /// EFAULT | 错误的地址 300004e86ffSlogin /// 301004e86ffSlogin /// ENAMETOOLONG | 路径过长 302ab5c8ca4Slogin pub fn chdir(dest_path: &str) -> Result<usize, SystemError> { 3031496ba7bSLoGin let proc = ProcessManager::current_pcb(); 304ab5c8ca4Slogin // Copy path to kernel space to avoid some security issues 3051496ba7bSLoGin let path = dest_path.to_string(); 3061496ba7bSLoGin let mut new_path = String::from(""); 3071496ba7bSLoGin if path.len() > 0 { 3081496ba7bSLoGin let cwd = match path.as_bytes()[0] { 3091496ba7bSLoGin b'/' => String::from("/"), 3101496ba7bSLoGin _ => proc.basic().cwd(), 3111496ba7bSLoGin }; 3121496ba7bSLoGin let mut cwd_vec: Vec<_> = cwd.split("/").filter(|&x| x != "").collect(); 3131496ba7bSLoGin let path_split = path.split("/").filter(|&x| x != ""); 3141496ba7bSLoGin for seg in path_split { 3151496ba7bSLoGin if seg == ".." { 3161496ba7bSLoGin cwd_vec.pop(); 3171496ba7bSLoGin } else if seg == "." { 3181496ba7bSLoGin // 当前目录 3191496ba7bSLoGin } else { 3201496ba7bSLoGin cwd_vec.push(seg); 3211496ba7bSLoGin } 3221496ba7bSLoGin } 3231496ba7bSLoGin //proc.basic().set_path(String::from("")); 3241496ba7bSLoGin for seg in cwd_vec { 3251496ba7bSLoGin new_path.push_str("/"); 3261496ba7bSLoGin new_path.push_str(seg); 3271496ba7bSLoGin } 3281496ba7bSLoGin if new_path == "" { 3291496ba7bSLoGin new_path = String::from("/"); 3301496ba7bSLoGin } 3311496ba7bSLoGin } 3321496ba7bSLoGin let inode = match ROOT_INODE().lookup(&new_path) { 333004e86ffSlogin Err(e) => { 334676b8ef6SMork kerror!("Change Directory Failed, Error = {:?}", e); 335ab5c8ca4Slogin return Err(SystemError::ENOENT); 336004e86ffSlogin } 337004e86ffSlogin Ok(i) => i, 338004e86ffSlogin }; 3391496ba7bSLoGin let metadata = inode.metadata()?; 3401496ba7bSLoGin if metadata.file_type == FileType::Dir { 3411496ba7bSLoGin proc.basic_mut().set_cwd(String::from(new_path)); 342ab5c8ca4Slogin return Ok(0); 343004e86ffSlogin } else { 344ab5c8ca4Slogin return Err(SystemError::ENOTDIR); 345004e86ffSlogin } 346004e86ffSlogin } 3471496ba7bSLoGin 3481496ba7bSLoGin /// @brief 获取当前进程的工作目录路径 3491496ba7bSLoGin /// 3501496ba7bSLoGin /// @param buf 指向缓冲区的指针 3511496ba7bSLoGin /// @param size 缓冲区的大小 3521496ba7bSLoGin /// 3531496ba7bSLoGin /// @return 成功,返回的指针指向包含工作目录路径的字符串 3541496ba7bSLoGin /// @return 错误,没有足够的空间 3551496ba7bSLoGin pub fn getcwd(buf: &mut [u8]) -> Result<VirtAddr, SystemError> { 3561496ba7bSLoGin let proc = ProcessManager::current_pcb(); 3571496ba7bSLoGin let cwd = proc.basic().cwd(); 3581496ba7bSLoGin 3591496ba7bSLoGin let cwd_bytes = cwd.as_bytes(); 3601496ba7bSLoGin let cwd_len = cwd_bytes.len(); 3611496ba7bSLoGin if cwd_len + 1 > buf.len() { 3621496ba7bSLoGin return Err(SystemError::ENOMEM); 363004e86ffSlogin } 3641496ba7bSLoGin buf[..cwd_len].copy_from_slice(cwd_bytes); 3651496ba7bSLoGin buf[cwd_len] = 0; 3661496ba7bSLoGin 3671496ba7bSLoGin return Ok(VirtAddr::new(buf.as_ptr() as usize)); 368004e86ffSlogin } 369004e86ffSlogin 370004e86ffSlogin /// @brief 获取目录中的数据 371004e86ffSlogin /// 372ab5c8ca4Slogin /// TODO: 这个函数的语义与Linux不一致,需要修改!!! 373ab5c8ca4Slogin /// 374004e86ffSlogin /// @param fd 文件描述符号 375ab5c8ca4Slogin /// @param buf 输出缓冲区 376ab5c8ca4Slogin /// 377ab5c8ca4Slogin /// @return 成功返回读取的字节数,失败返回错误码 378ab5c8ca4Slogin pub fn getdents(fd: i32, buf: &mut [u8]) -> Result<usize, SystemError> { 379ab5c8ca4Slogin let dirent = 380ab5c8ca4Slogin unsafe { (buf.as_mut_ptr() as *mut Dirent).as_mut() }.ok_or(SystemError::EFAULT)?; 381004e86ffSlogin 382004e86ffSlogin if fd < 0 || fd as u32 > PROC_MAX_FD_NUM { 383ab5c8ca4Slogin return Err(SystemError::EBADF); 384004e86ffSlogin } 385004e86ffSlogin 386004e86ffSlogin // 获取fd 3871496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 3881496ba7bSLoGin let fd_table_guard = binding.read(); 3891496ba7bSLoGin let file = fd_table_guard 3901496ba7bSLoGin .get_file_by_fd(fd) 3911496ba7bSLoGin .ok_or(SystemError::EBADF)?; 392004e86ffSlogin 3931496ba7bSLoGin // drop guard 以避免无法调度的问题 3941496ba7bSLoGin drop(fd_table_guard); 395*34e6d6c8Syuyi2439 396*34e6d6c8Syuyi2439 let res = file.lock_no_preempt().readdir(dirent).map(|x| x as usize); 397*34e6d6c8Syuyi2439 398*34e6d6c8Syuyi2439 return res; 399004e86ffSlogin } 400004e86ffSlogin 401004e86ffSlogin /// @brief 创建文件夹 402004e86ffSlogin /// 403004e86ffSlogin /// @param path(r8) 路径 / mode(r9) 模式 404004e86ffSlogin /// 405004e86ffSlogin /// @return uint64_t 负数错误码 / 0表示成功 406ab5c8ca4Slogin pub fn mkdir(path: &str, mode: usize) -> Result<usize, SystemError> { 407ab5c8ca4Slogin return do_mkdir(path, FileMode::from_bits_truncate(mode as u32)).map(|x| x as usize); 408004e86ffSlogin } 409004e86ffSlogin 410ab5c8ca4Slogin /// **删除文件夹、取消文件的链接、删除文件的系统调用** 411004e86ffSlogin /// 412ab5c8ca4Slogin /// ## 参数 413004e86ffSlogin /// 414ab5c8ca4Slogin /// - `dirfd`:文件夹的文件描述符.目前暂未实现 415ab5c8ca4Slogin /// - `pathname`:文件夹的路径 416ab5c8ca4Slogin /// - `flags`:标志位 417004e86ffSlogin /// 418004e86ffSlogin /// 419ab5c8ca4Slogin pub fn unlinkat(_dirfd: i32, pathname: &str, flags: u32) -> Result<usize, SystemError> { 420004e86ffSlogin // kdebug!("sys_unlink_at={path:?}"); 421ab5c8ca4Slogin if (flags & (!AT_REMOVEDIR)) != 0 { 422ab5c8ca4Slogin return Err(SystemError::EINVAL); 423004e86ffSlogin } 424004e86ffSlogin 425ab5c8ca4Slogin if (flags & AT_REMOVEDIR) > 0 { 426004e86ffSlogin // kdebug!("rmdir"); 427ab5c8ca4Slogin match do_remove_dir(&pathname) { 428004e86ffSlogin Err(err) => { 429676b8ef6SMork kerror!("Failed to Remove Directory, Error Code = {:?}", err); 430ab5c8ca4Slogin return Err(err); 431004e86ffSlogin } 432004e86ffSlogin Ok(_) => { 433ab5c8ca4Slogin return Ok(0); 434004e86ffSlogin } 435004e86ffSlogin } 436004e86ffSlogin } 437004e86ffSlogin 438ab5c8ca4Slogin match do_unlink_at(&pathname, FileMode::from_bits_truncate(flags as u32)) { 439004e86ffSlogin Err(err) => { 440676b8ef6SMork kerror!("Failed to Remove Directory, Error Code = {:?}", err); 441ab5c8ca4Slogin return Err(err); 442004e86ffSlogin } 443004e86ffSlogin Ok(_) => { 444ab5c8ca4Slogin return Ok(0); 445004e86ffSlogin } 446004e86ffSlogin } 447004e86ffSlogin } 4482b771e32SGou Ngai 449ab5c8ca4Slogin /// @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 450ab5c8ca4Slogin pub fn dup(oldfd: i32) -> Result<usize, SystemError> { 4511496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 4521496ba7bSLoGin let mut fd_table_guard = binding.write(); 453ab5c8ca4Slogin 4541496ba7bSLoGin let old_file = fd_table_guard 4551496ba7bSLoGin .get_file_by_fd(oldfd) 4561496ba7bSLoGin .ok_or(SystemError::EBADF)?; 4571496ba7bSLoGin 4581496ba7bSLoGin let new_file = old_file 4591496ba7bSLoGin .lock_no_preempt() 4601496ba7bSLoGin .try_clone() 4611496ba7bSLoGin .ok_or(SystemError::EBADF)?; 4622b771e32SGou Ngai // 申请文件描述符,并把文件对象存入其中 4631496ba7bSLoGin let res = fd_table_guard.alloc_fd(new_file, None).map(|x| x as usize); 4642b771e32SGou Ngai return res; 4652b771e32SGou Ngai } 4662b771e32SGou Ngai 467ab5c8ca4Slogin /// 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, 468ab5c8ca4Slogin /// 并返回新复制的文件结构体对应的fd. 469ab5c8ca4Slogin /// 如果新fd已经打开,则会先关闭新fd. 470ab5c8ca4Slogin /// 471ab5c8ca4Slogin /// ## 参数 472ab5c8ca4Slogin /// 473ab5c8ca4Slogin /// - `oldfd`:旧文件描述符 474ab5c8ca4Slogin /// - `newfd`:新文件描述符 475ab5c8ca4Slogin /// 476ab5c8ca4Slogin /// ## 返回值 477ab5c8ca4Slogin /// 478ab5c8ca4Slogin /// - 成功:新文件描述符 479ab5c8ca4Slogin /// - 失败:错误码 480ab5c8ca4Slogin pub fn dup2(oldfd: i32, newfd: i32) -> Result<usize, SystemError> { 4811496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 4821496ba7bSLoGin let mut fd_table_guard = binding.write(); 4831496ba7bSLoGin return Self::do_dup2(oldfd, newfd, &mut fd_table_guard); 4841496ba7bSLoGin } 4851496ba7bSLoGin 4861496ba7bSLoGin fn do_dup2( 4871496ba7bSLoGin oldfd: i32, 4881496ba7bSLoGin newfd: i32, 4891496ba7bSLoGin fd_table_guard: &mut RwLockWriteGuard<'_, FileDescriptorVec>, 4901496ba7bSLoGin ) -> Result<usize, SystemError> { 4912b771e32SGou Ngai // 确认oldfd, newid是否有效 4921496ba7bSLoGin if !(FileDescriptorVec::validate_fd(oldfd) && FileDescriptorVec::validate_fd(newfd)) { 4931496ba7bSLoGin return Err(SystemError::EBADF); 4941496ba7bSLoGin } 4951496ba7bSLoGin 4962b771e32SGou Ngai if oldfd == newfd { 4972b771e32SGou Ngai // 若oldfd与newfd相等 498ab5c8ca4Slogin return Ok(newfd as usize); 4992b771e32SGou Ngai } 5001496ba7bSLoGin let new_exists = fd_table_guard.get_file_by_fd(newfd).is_some(); 5011496ba7bSLoGin if new_exists { 5022b771e32SGou Ngai // close newfd 5031496ba7bSLoGin if let Err(_) = fd_table_guard.drop_fd(newfd) { 5042b771e32SGou Ngai // An I/O error occurred while attempting to close fildes2. 5052b771e32SGou Ngai return Err(SystemError::EIO); 5062b771e32SGou Ngai } 5072b771e32SGou Ngai } 5082b771e32SGou Ngai 5091496ba7bSLoGin let old_file = fd_table_guard 5101496ba7bSLoGin .get_file_by_fd(oldfd) 5111496ba7bSLoGin .ok_or(SystemError::EBADF)?; 5121496ba7bSLoGin let new_file = old_file 5131496ba7bSLoGin .lock_no_preempt() 5141496ba7bSLoGin .try_clone() 5151496ba7bSLoGin .ok_or(SystemError::EBADF)?; 5162b771e32SGou Ngai // 申请文件描述符,并把文件对象存入其中 5171496ba7bSLoGin let res = fd_table_guard 5181496ba7bSLoGin .alloc_fd(new_file, Some(newfd)) 519ab5c8ca4Slogin .map(|x| x as usize); 5202b771e32SGou Ngai return res; 5212b771e32SGou Ngai } 5226d81180bSLoGin 5236d81180bSLoGin /// # fcntl 5246d81180bSLoGin /// 5256d81180bSLoGin /// ## 参数 5266d81180bSLoGin /// 5276d81180bSLoGin /// - `fd`:文件描述符 5286d81180bSLoGin /// - `cmd`:命令 5296d81180bSLoGin /// - `arg`:参数 5306d81180bSLoGin pub fn fcntl(fd: i32, cmd: FcntlCommand, arg: i32) -> Result<usize, SystemError> { 5316d81180bSLoGin match cmd { 5326d81180bSLoGin FcntlCommand::DupFd => { 5336d81180bSLoGin if arg < 0 || arg as usize >= FileDescriptorVec::PROCESS_MAX_FD { 5346d81180bSLoGin return Err(SystemError::EBADF); 5356d81180bSLoGin } 5366d81180bSLoGin let arg = arg as usize; 5376d81180bSLoGin for i in arg..FileDescriptorVec::PROCESS_MAX_FD { 5381496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5391496ba7bSLoGin let mut fd_table_guard = binding.write(); 5401496ba7bSLoGin if fd_table_guard.get_file_by_fd(fd).is_none() { 5411496ba7bSLoGin return Self::do_dup2(fd, i as i32, &mut fd_table_guard); 5426d81180bSLoGin } 5436d81180bSLoGin } 5446d81180bSLoGin return Err(SystemError::EMFILE); 5456d81180bSLoGin } 5466d81180bSLoGin FcntlCommand::GetFd => { 5476d81180bSLoGin // Get file descriptor flags. 5481496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5491496ba7bSLoGin let fd_table_guard = binding.read(); 5501496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 5511496ba7bSLoGin // drop guard 以避免无法调度的问题 5521496ba7bSLoGin drop(fd_table_guard); 5536d81180bSLoGin 5541496ba7bSLoGin if file.lock().close_on_exec() { 5556d81180bSLoGin return Ok(FD_CLOEXEC as usize); 5566d81180bSLoGin } 5576d81180bSLoGin } 5586d81180bSLoGin return Err(SystemError::EBADF); 5596d81180bSLoGin } 5606d81180bSLoGin FcntlCommand::SetFd => { 5616d81180bSLoGin // Set file descriptor flags. 5621496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5631496ba7bSLoGin let fd_table_guard = binding.write(); 5641496ba7bSLoGin 5651496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 5661496ba7bSLoGin // drop guard 以避免无法调度的问题 5671496ba7bSLoGin drop(fd_table_guard); 5686d81180bSLoGin let arg = arg as u32; 5696d81180bSLoGin if arg & FD_CLOEXEC != 0 { 5701496ba7bSLoGin file.lock().set_close_on_exec(true); 5716d81180bSLoGin } else { 5721496ba7bSLoGin file.lock().set_close_on_exec(false); 5736d81180bSLoGin } 5746d81180bSLoGin return Ok(0); 5756d81180bSLoGin } 5766d81180bSLoGin return Err(SystemError::EBADF); 5776d81180bSLoGin } 5786d81180bSLoGin 5796d81180bSLoGin FcntlCommand::GetFlags => { 5806d81180bSLoGin // Get file status flags. 5811496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5821496ba7bSLoGin let fd_table_guard = binding.read(); 5831496ba7bSLoGin 5841496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 5851496ba7bSLoGin // drop guard 以避免无法调度的问题 5861496ba7bSLoGin drop(fd_table_guard); 5871496ba7bSLoGin return Ok(file.lock_no_preempt().mode().bits() as usize); 5886d81180bSLoGin } 5891496ba7bSLoGin 5906d81180bSLoGin return Err(SystemError::EBADF); 5916d81180bSLoGin } 5926d81180bSLoGin FcntlCommand::SetFlags => { 5936d81180bSLoGin // Set file status flags. 5941496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 5951496ba7bSLoGin let fd_table_guard = binding.write(); 5961496ba7bSLoGin 5971496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 5986d81180bSLoGin let arg = arg as u32; 5996d81180bSLoGin let mode = FileMode::from_bits(arg).ok_or(SystemError::EINVAL)?; 6001496ba7bSLoGin // drop guard 以避免无法调度的问题 6011496ba7bSLoGin drop(fd_table_guard); 6021496ba7bSLoGin file.lock_no_preempt().set_mode(mode)?; 6036d81180bSLoGin return Ok(0); 6046d81180bSLoGin } 6051496ba7bSLoGin 6066d81180bSLoGin return Err(SystemError::EBADF); 6076d81180bSLoGin } 6086d81180bSLoGin _ => { 6096d81180bSLoGin // TODO: unimplemented 6106d81180bSLoGin // 未实现的命令,返回0,不报错。 6116d81180bSLoGin 6126d81180bSLoGin // kwarn!("fcntl: unimplemented command: {:?}, defaults to 0.", cmd); 6136d81180bSLoGin return Ok(0); 6146d81180bSLoGin } 6156d81180bSLoGin } 6166d81180bSLoGin } 6176d81180bSLoGin 6186d81180bSLoGin /// # ftruncate 6196d81180bSLoGin /// 6206d81180bSLoGin /// ## 描述 6216d81180bSLoGin /// 6226d81180bSLoGin /// 改变文件大小. 6236d81180bSLoGin /// 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. 6246d81180bSLoGin /// 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. 6256d81180bSLoGin /// 6266d81180bSLoGin /// ## 参数 6276d81180bSLoGin /// 6286d81180bSLoGin /// - `fd`:文件描述符 6296d81180bSLoGin /// - `len`:文件大小 6306d81180bSLoGin /// 6316d81180bSLoGin /// ## 返回值 6326d81180bSLoGin /// 6336d81180bSLoGin /// 如果成功,返回0,否则返回错误码. 6346d81180bSLoGin pub fn ftruncate(fd: i32, len: usize) -> Result<usize, SystemError> { 6351496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 6361496ba7bSLoGin let fd_table_guard = binding.read(); 6371496ba7bSLoGin 6381496ba7bSLoGin if let Some(file) = fd_table_guard.get_file_by_fd(fd) { 6391496ba7bSLoGin // drop guard 以避免无法调度的问题 6401496ba7bSLoGin drop(fd_table_guard); 6411496ba7bSLoGin let r = file.lock_no_preempt().ftruncate(len).map(|_| 0); 6426d81180bSLoGin return r; 6436d81180bSLoGin } 6441496ba7bSLoGin 6456d81180bSLoGin return Err(SystemError::EBADF); 6466d81180bSLoGin } 6471496ba7bSLoGin 64867b48188Shoumkh fn do_fstat(fd: i32) -> Result<PosixKstat, SystemError> { 6491496ba7bSLoGin let binding = ProcessManager::current_pcb().fd_table(); 6501496ba7bSLoGin let fd_table_guard = binding.read(); 6511496ba7bSLoGin let file = fd_table_guard 6521496ba7bSLoGin .get_file_by_fd(fd) 6531496ba7bSLoGin .ok_or(SystemError::EBADF)?; 6541496ba7bSLoGin // drop guard 以避免无法调度的问题 6551496ba7bSLoGin drop(fd_table_guard); 6561496ba7bSLoGin 65767b48188Shoumkh let mut kstat = PosixKstat::new(); 65867b48188Shoumkh // 获取文件信息 6591496ba7bSLoGin let metadata = file.lock().metadata()?; 66067b48188Shoumkh kstat.size = metadata.size as i64; 66167b48188Shoumkh kstat.dev_id = metadata.dev_id as u64; 6626b4e7a29SLoGin kstat.inode = metadata.inode_id.into() as u64; 66367b48188Shoumkh kstat.blcok_size = metadata.blk_size as i64; 66467b48188Shoumkh kstat.blocks = metadata.blocks as u64; 66567b48188Shoumkh 66667b48188Shoumkh kstat.atime.tv_sec = metadata.atime.tv_sec; 66767b48188Shoumkh kstat.atime.tv_nsec = metadata.atime.tv_nsec; 66867b48188Shoumkh kstat.mtime.tv_sec = metadata.mtime.tv_sec; 66967b48188Shoumkh kstat.mtime.tv_nsec = metadata.mtime.tv_nsec; 67067b48188Shoumkh kstat.ctime.tv_sec = metadata.ctime.tv_sec; 67167b48188Shoumkh kstat.ctime.tv_nsec = metadata.ctime.tv_nsec; 67267b48188Shoumkh 67367b48188Shoumkh kstat.nlink = metadata.nlinks as u64; 67467b48188Shoumkh kstat.uid = metadata.uid as i32; 67567b48188Shoumkh kstat.gid = metadata.gid as i32; 67667b48188Shoumkh kstat.rdev = metadata.raw_dev as i64; 6776b4e7a29SLoGin kstat.mode = metadata.mode; 6781496ba7bSLoGin match file.lock().file_type() { 67967b48188Shoumkh FileType::File => kstat.mode.insert(ModeType::S_IFMT), 68067b48188Shoumkh FileType::Dir => kstat.mode.insert(ModeType::S_IFDIR), 68167b48188Shoumkh FileType::BlockDevice => kstat.mode.insert(ModeType::S_IFBLK), 68267b48188Shoumkh FileType::CharDevice => kstat.mode.insert(ModeType::S_IFCHR), 68367b48188Shoumkh FileType::SymLink => kstat.mode.insert(ModeType::S_IFLNK), 68467b48188Shoumkh FileType::Socket => kstat.mode.insert(ModeType::S_IFSOCK), 68567b48188Shoumkh FileType::Pipe => kstat.mode.insert(ModeType::S_IFIFO), 68667b48188Shoumkh } 68767b48188Shoumkh 68867b48188Shoumkh return Ok(kstat); 68967b48188Shoumkh } 6901496ba7bSLoGin 69167b48188Shoumkh pub fn fstat(fd: i32, usr_kstat: *mut PosixKstat) -> Result<usize, SystemError> { 6921496ba7bSLoGin let kstat = Self::do_fstat(fd)?; 69367b48188Shoumkh if usr_kstat.is_null() { 69467b48188Shoumkh return Err(SystemError::EFAULT); 69567b48188Shoumkh } 69667b48188Shoumkh unsafe { 69767b48188Shoumkh *usr_kstat = kstat; 69867b48188Shoumkh } 69967b48188Shoumkh return Ok(0); 70067b48188Shoumkh } 70167b48188Shoumkh } 702cde5492fSlogin #[repr(C)] 703cde5492fSlogin #[derive(Debug, Clone, Copy)] 704cde5492fSlogin pub struct IoVec { 705cde5492fSlogin /// 缓冲区的起始地址 706cde5492fSlogin pub iov_base: *mut u8, 707cde5492fSlogin /// 缓冲区的长度 708cde5492fSlogin pub iov_len: usize, 709cde5492fSlogin } 710cde5492fSlogin 711cde5492fSlogin /// 用于存储多个来自用户空间的IoVec 712cde5492fSlogin /// 713cde5492fSlogin /// 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。 714cde5492fSlogin /// TODO:支持分散读写 715cde5492fSlogin #[derive(Debug)] 716cde5492fSlogin pub struct IoVecs(Vec<&'static mut [u8]>); 717cde5492fSlogin 718cde5492fSlogin impl IoVecs { 719cde5492fSlogin /// 从用户空间的IoVec中构造IoVecs 720cde5492fSlogin /// 721cde5492fSlogin /// @param iov 用户空间的IoVec 722cde5492fSlogin /// @param iovcnt 用户空间的IoVec的数量 723cde5492fSlogin /// @param readv 是否为readv系统调用 724cde5492fSlogin /// 725cde5492fSlogin /// @return 构造成功返回IoVecs,否则返回错误码 726cde5492fSlogin pub unsafe fn from_user( 727cde5492fSlogin iov: *const IoVec, 728cde5492fSlogin iovcnt: usize, 729cde5492fSlogin _readv: bool, 730cde5492fSlogin ) -> Result<Self, SystemError> { 731cde5492fSlogin // 检查iov指针所在空间是否合法 732cde5492fSlogin if !verify_area( 733cde5492fSlogin iov as usize as u64, 734cde5492fSlogin (iovcnt * core::mem::size_of::<IoVec>()) as u64, 735cde5492fSlogin ) { 736cde5492fSlogin return Err(SystemError::EFAULT); 737cde5492fSlogin } 738cde5492fSlogin 739cde5492fSlogin // 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) 740cde5492fSlogin let iovs: &[IoVec] = core::slice::from_raw_parts(iov, iovcnt); 741cde5492fSlogin 742cde5492fSlogin let mut slices: Vec<&mut [u8]> = vec![]; 743cde5492fSlogin slices.reserve(iovs.len()); 744cde5492fSlogin 745cde5492fSlogin for iov in iovs.iter() { 746cde5492fSlogin if iov.iov_len == 0 { 747cde5492fSlogin continue; 748cde5492fSlogin } 749cde5492fSlogin 750cde5492fSlogin if !verify_area(iov.iov_base as usize as u64, iov.iov_len as u64) { 751cde5492fSlogin return Err(SystemError::EFAULT); 752cde5492fSlogin } 753cde5492fSlogin 754cde5492fSlogin slices.push(core::slice::from_raw_parts_mut(iov.iov_base, iov.iov_len)); 755cde5492fSlogin } 756cde5492fSlogin 757cde5492fSlogin return Ok(Self(slices)); 758cde5492fSlogin } 759cde5492fSlogin 760cde5492fSlogin /// @brief 将IoVecs中的数据聚合到一个缓冲区中 761cde5492fSlogin /// 762cde5492fSlogin /// @return 返回聚合后的缓冲区 763cde5492fSlogin pub fn gather(&self) -> Vec<u8> { 764cde5492fSlogin let mut buf = Vec::new(); 765cde5492fSlogin for slice in self.0.iter() { 766cde5492fSlogin buf.extend_from_slice(slice); 767cde5492fSlogin } 768cde5492fSlogin return buf; 769cde5492fSlogin } 770cde5492fSlogin 771cde5492fSlogin /// @brief 将给定的数据分散写入到IoVecs中 772cde5492fSlogin pub fn scatter(&mut self, data: &[u8]) { 773cde5492fSlogin let mut data: &[u8] = data; 774cde5492fSlogin for slice in self.0.iter_mut() { 775cde5492fSlogin let len = core::cmp::min(slice.len(), data.len()); 776cde5492fSlogin if len == 0 { 777cde5492fSlogin continue; 778cde5492fSlogin } 779cde5492fSlogin 780cde5492fSlogin slice[..len].copy_from_slice(&data[..len]); 781cde5492fSlogin data = &data[len..]; 782cde5492fSlogin } 783cde5492fSlogin } 784cde5492fSlogin 785cde5492fSlogin /// @brief 创建与IoVecs等长的缓冲区 786cde5492fSlogin /// 787cde5492fSlogin /// @param set_len 是否设置返回的Vec的len。 788cde5492fSlogin /// 如果为true,则返回的Vec的len为所有IoVec的长度之和; 789cde5492fSlogin /// 否则返回的Vec的len为0,capacity为所有IoVec的长度之和. 790cde5492fSlogin /// 791cde5492fSlogin /// @return 返回创建的缓冲区 792cde5492fSlogin pub fn new_buf(&self, set_len: bool) -> Vec<u8> { 793cde5492fSlogin let total_len: usize = self.0.iter().map(|slice| slice.len()).sum(); 794cde5492fSlogin let mut buf: Vec<u8> = Vec::with_capacity(total_len); 795cde5492fSlogin 796cde5492fSlogin if set_len { 7977ae679ddSLoGin buf.resize(total_len, 0); 798cde5492fSlogin } 799cde5492fSlogin return buf; 800cde5492fSlogin } 801cde5492fSlogin } 802