10fb515b0SLoGin use alloc::sync::Arc; 2*91e9d4abSLoGin use system_error::SystemError; 30fb515b0SLoGin 4bf4a4899SLoGin use crate::{ 5*91e9d4abSLoGin driver::base::block::SeekFrom, process::ProcessManager, 6*91e9d4abSLoGin syscall::user_access::check_and_clone_cstr, 7bf4a4899SLoGin }; 89b0abe6dSLoGin 9bf4a4899SLoGin use super::{ 100fb515b0SLoGin fcntl::AtFlags, 110fb515b0SLoGin file::{File, FileMode}, 120fb515b0SLoGin syscall::{ModeType, OpenHow, OpenHowResolve}, 130fb515b0SLoGin utils::{rsplit_path, user_path_at}, 140fb515b0SLoGin FileType, IndexNode, MAX_PATHLEN, ROOT_INODE, VFS_MAX_FOLLOW_SYMLINK_TIMES, 15bf4a4899SLoGin }; 169b0abe6dSLoGin 179b0abe6dSLoGin pub(super) fn do_faccessat( 18bf4a4899SLoGin dirfd: i32, 19bf4a4899SLoGin path: *const u8, 209b0abe6dSLoGin mode: ModeType, 219b0abe6dSLoGin flags: u32, 229b0abe6dSLoGin ) -> Result<usize, SystemError> { 23bf4a4899SLoGin if (mode.bits() & (!ModeType::S_IRWXO.bits())) != 0 { 249b0abe6dSLoGin return Err(SystemError::EINVAL); 259b0abe6dSLoGin } 269b0abe6dSLoGin 279b0abe6dSLoGin if (flags 289b0abe6dSLoGin & (!((AtFlags::AT_EACCESS | AtFlags::AT_SYMLINK_NOFOLLOW | AtFlags::AT_EMPTY_PATH).bits() 299b0abe6dSLoGin as u32))) 309b0abe6dSLoGin != 0 319b0abe6dSLoGin { 329b0abe6dSLoGin return Err(SystemError::EINVAL); 339b0abe6dSLoGin } 349b0abe6dSLoGin 359b0abe6dSLoGin // let follow_symlink = flags & AtFlags::AT_SYMLINK_NOFOLLOW.bits() as u32 == 0; 369b0abe6dSLoGin 37bf4a4899SLoGin let path = check_and_clone_cstr(path, Some(MAX_PATHLEN))?; 38bf4a4899SLoGin 39bf4a4899SLoGin if path.len() == 0 { 40bf4a4899SLoGin return Err(SystemError::EINVAL); 41bf4a4899SLoGin } 42bf4a4899SLoGin 430fb515b0SLoGin let (inode, path) = user_path_at(&ProcessManager::current_pcb(), dirfd, &path)?; 44bf4a4899SLoGin 45bf4a4899SLoGin // 如果找不到文件,则返回错误码ENOENT 46bf4a4899SLoGin let _inode = inode.lookup_follow_symlink(path.as_str(), VFS_MAX_FOLLOW_SYMLINK_TIMES)?; 47bf4a4899SLoGin 489b0abe6dSLoGin // todo: 接着完善(可以借鉴linux 6.1.9的do_faccessat) 499b0abe6dSLoGin return Ok(0); 509b0abe6dSLoGin } 51bf4a4899SLoGin 52bf4a4899SLoGin pub fn do_fchmodat(dirfd: i32, path: *const u8, _mode: ModeType) -> Result<usize, SystemError> { 53bf4a4899SLoGin let path = check_and_clone_cstr(path, Some(MAX_PATHLEN))?; 54bf4a4899SLoGin 55bf4a4899SLoGin if path.len() == 0 { 56bf4a4899SLoGin return Err(SystemError::EINVAL); 57bf4a4899SLoGin } 58bf4a4899SLoGin 590fb515b0SLoGin let (inode, path) = user_path_at(&ProcessManager::current_pcb(), dirfd, &path)?; 60bf4a4899SLoGin 61bf4a4899SLoGin // 如果找不到文件,则返回错误码ENOENT 62bf4a4899SLoGin let _inode = inode.lookup_follow_symlink(path.as_str(), VFS_MAX_FOLLOW_SYMLINK_TIMES)?; 63bf4a4899SLoGin 64bf4a4899SLoGin kwarn!("do_fchmodat: not implemented yet\n"); 65bf4a4899SLoGin // todo: 真正去改变文件的权限 66bf4a4899SLoGin 67bf4a4899SLoGin return Ok(0); 68bf4a4899SLoGin } 690fb515b0SLoGin 700fb515b0SLoGin pub(super) fn do_sys_open( 710fb515b0SLoGin dfd: i32, 720fb515b0SLoGin path: &str, 730fb515b0SLoGin o_flags: FileMode, 740fb515b0SLoGin mode: ModeType, 750fb515b0SLoGin follow_symlink: bool, 760fb515b0SLoGin ) -> Result<usize, SystemError> { 770fb515b0SLoGin let how = OpenHow::new(o_flags, mode, OpenHowResolve::empty()); 780fb515b0SLoGin return do_sys_openat2(dfd, path, how, follow_symlink); 790fb515b0SLoGin } 800fb515b0SLoGin 810fb515b0SLoGin fn do_sys_openat2( 820fb515b0SLoGin dirfd: i32, 830fb515b0SLoGin path: &str, 840fb515b0SLoGin how: OpenHow, 850fb515b0SLoGin follow_symlink: bool, 860fb515b0SLoGin ) -> Result<usize, SystemError> { 870fb515b0SLoGin // kdebug!("open: path: {}, mode: {:?}", path, mode); 880fb515b0SLoGin // 文件名过长 890fb515b0SLoGin if path.len() > MAX_PATHLEN as usize { 900fb515b0SLoGin return Err(SystemError::ENAMETOOLONG); 910fb515b0SLoGin } 920fb515b0SLoGin let (inode_begin, path) = user_path_at(&ProcessManager::current_pcb(), dirfd, path)?; 930fb515b0SLoGin let inode: Result<Arc<dyn IndexNode>, SystemError> = inode_begin.lookup_follow_symlink( 940fb515b0SLoGin &path, 950fb515b0SLoGin if follow_symlink { 960fb515b0SLoGin VFS_MAX_FOLLOW_SYMLINK_TIMES 970fb515b0SLoGin } else { 980fb515b0SLoGin 0 990fb515b0SLoGin }, 1000fb515b0SLoGin ); 1010fb515b0SLoGin 1020fb515b0SLoGin let inode: Arc<dyn IndexNode> = if inode.is_err() { 1030fb515b0SLoGin let errno = inode.unwrap_err(); 1040fb515b0SLoGin // 文件不存在,且需要创建 1050fb515b0SLoGin if how.o_flags.contains(FileMode::O_CREAT) 1060fb515b0SLoGin && !how.o_flags.contains(FileMode::O_DIRECTORY) 1070fb515b0SLoGin && errno == SystemError::ENOENT 1080fb515b0SLoGin { 1090fb515b0SLoGin let (filename, parent_path) = rsplit_path(&path); 1100fb515b0SLoGin // 查找父目录 1110fb515b0SLoGin let parent_inode: Arc<dyn IndexNode> = 1120fb515b0SLoGin ROOT_INODE().lookup(parent_path.unwrap_or("/"))?; 1130fb515b0SLoGin // 创建文件 1140fb515b0SLoGin let inode: Arc<dyn IndexNode> = parent_inode.create( 1150fb515b0SLoGin filename, 1160fb515b0SLoGin FileType::File, 1170fb515b0SLoGin ModeType::from_bits_truncate(0o755), 1180fb515b0SLoGin )?; 1190fb515b0SLoGin inode 1200fb515b0SLoGin } else { 1210fb515b0SLoGin // 不需要创建文件,因此返回错误码 1220fb515b0SLoGin return Err(errno); 1230fb515b0SLoGin } 1240fb515b0SLoGin } else { 1250fb515b0SLoGin inode.unwrap() 1260fb515b0SLoGin }; 1270fb515b0SLoGin 1280fb515b0SLoGin let file_type: FileType = inode.metadata()?.file_type; 1290fb515b0SLoGin // 如果要打开的是文件夹,而目标不是文件夹 1300fb515b0SLoGin if how.o_flags.contains(FileMode::O_DIRECTORY) && file_type != FileType::Dir { 1310fb515b0SLoGin return Err(SystemError::ENOTDIR); 1320fb515b0SLoGin } 1330fb515b0SLoGin 1340fb515b0SLoGin // 创建文件对象 1350fb515b0SLoGin 1360fb515b0SLoGin let mut file: File = File::new(inode, how.o_flags)?; 1370fb515b0SLoGin 1380fb515b0SLoGin // 打开模式为“追加” 1390fb515b0SLoGin if how.o_flags.contains(FileMode::O_APPEND) { 1400fb515b0SLoGin file.lseek(SeekFrom::SeekEnd(0))?; 1410fb515b0SLoGin } 1420fb515b0SLoGin 1430fb515b0SLoGin // 如果O_TRUNC,并且,打开模式包含O_RDWR或O_WRONLY,清空文件 1440fb515b0SLoGin if how.o_flags.contains(FileMode::O_TRUNC) 1450fb515b0SLoGin && (how.o_flags.contains(FileMode::O_RDWR) || how.o_flags.contains(FileMode::O_WRONLY)) 1460fb515b0SLoGin && file_type == FileType::File 1470fb515b0SLoGin { 1480fb515b0SLoGin file.ftruncate(0)?; 1490fb515b0SLoGin } 1500fb515b0SLoGin // 把文件对象存入pcb 1510fb515b0SLoGin let r = ProcessManager::current_pcb() 1520fb515b0SLoGin .fd_table() 1530fb515b0SLoGin .write() 1540fb515b0SLoGin .alloc_fd(file, None) 1550fb515b0SLoGin .map(|fd| fd as usize); 1560fb515b0SLoGin 1570fb515b0SLoGin return r; 1580fb515b0SLoGin } 159