| 12 | namespace vfs { |
| 13 | |
| 14 | auto Open(const char* path, OpenFlags flags) -> Expected<File*> { |
| 15 | if (!GetVfsState().initialized) { |
| 16 | return std::unexpected(Error(ErrorCode::kFsNotMounted)); |
| 17 | } |
| 18 | |
| 19 | if (path == nullptr) { |
| 20 | return std::unexpected(Error(ErrorCode::kInvalidArgument)); |
| 21 | } |
| 22 | |
| 23 | if (strlen(path) >= kMaxPathLength) { |
| 24 | return std::unexpected(Error(ErrorCode::kFsInvalidPath)); |
| 25 | } |
| 26 | |
| 27 | LockGuard<SpinLock> guard(GetVfsState().vfs_lock_); |
| 28 | // 查找或创建 dentry |
| 29 | auto lookup_result = Lookup(path); |
| 30 | Dentry* dentry = nullptr; |
| 31 | |
| 32 | if (!lookup_result.has_value()) { |
| 33 | // 文件不存在，检查是否需要创建 |
| 34 | if ((flags & OpenFlags::kOCreate) == 0U) { |
| 35 | return std::unexpected(lookup_result.error()); |
| 36 | } |
| 37 | |
| 38 | // 创建新文件 |
| 39 | // 找到父目录路径 |
| 40 | char parent_path[512]; |
| 41 | char file_name[256]; |
| 42 | const char* last_slash = strrchr(path, '/'); |
| 43 | if (last_slash == nullptr || last_slash == path) { |
| 44 | strncpy(parent_path, "/", sizeof(parent_path)); |
| 45 | const char* name_start = path[0] == '/' ? path + 1 : path; |
| 46 | if (strlen(name_start) >= sizeof(file_name)) { |
| 47 | return std::unexpected(Error(ErrorCode::kFsInvalidPath)); |
| 48 | } |
| 49 | strncpy(file_name, name_start, sizeof(file_name)); |
| 50 | } else { |
| 51 | size_t parent_len = last_slash - path; |
| 52 | if (parent_len >= sizeof(parent_path)) { |
| 53 | return std::unexpected(Error(ErrorCode::kFsInvalidPath)); |
| 54 | } |
| 55 | strncpy(parent_path, path, parent_len); |
| 56 | parent_path[parent_len] = '\0'; |
| 57 | if (strlen(last_slash + 1) >= sizeof(file_name)) { |
| 58 | return std::unexpected(Error(ErrorCode::kFsInvalidPath)); |
| 59 | } |
| 60 | strncpy(file_name, last_slash + 1, sizeof(file_name)); |
| 61 | } |
| 62 | file_name[sizeof(file_name) - 1] = '\0'; |
| 63 | |
| 64 | // 查找父目录 |
| 65 | auto parent_result = Lookup(parent_path); |
| 66 | if (!parent_result.has_value()) { |
| 67 | return std::unexpected(parent_result.error()); |
| 68 | } |
| 69 | |
| 70 | Dentry* parent_dentry = parent_result.value(); |
| 71 | if (parent_dentry->inode == nullptr || |