feat: get Device from Card.

src/util.zig

@@ -0,0 +1,28 @@
+const std = @import("std");
+
+pub fn statPath(path: []const u8) !std.os.linux.Statx {
+    const posix_path = try std.posix.toPosixPath(path);
+    return statxInner(std.os.linux.AT.FDCWD, &posix_path, 0);
+}
+
+pub fn statFile(fd: std.posix.fd_t) !std.os.linux.Statx {
+    return statxInner(fd, "", std.os.linux.AT.EMPTY_PATH);
+}
+
+fn statxInner(fd: std.posix.fd_t, path: [*:0]const u8, flags: u32) !std.os.linux.Statx {
+    var stat_buf: std.os.linux.Statx = undefined;
+    const rc = std.posix.system.statx(fd, path, flags, .{}, &stat_buf);
+    return switch (std.posix.errno(rc)) {
+        .SUCCESS => stat_buf,
+        .ACCES => error.PermissionDenied,
+        .LOOP => error.SymLinkLoop,
+        .NAMETOOLONG => error.NameTooLong,
+        .NOENT => error.FileNotFound,
+        .NOMEM => error.SystemResources,
+        .NOTDIR => error.NotADirectory,
+        .BADF => unreachable,
+        .FAULT => unreachable,
+        .INVAL => unreachable,
+        else => |err| std.posix.unexpectedErrno(err),
+    };
+}