GetDeviceLogicalBlockSize impl for Linux and macOS

osspecifics/osspecifics_linux.go

@@ -0,0 +1,36 @@
+// Linsk - A utility to access Linux-native file systems on non-Linux operating systems.
+// Copyright (c) 2023 The Linsk Authors.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+// go:build linux
+
+package osspecifics
+
+import (
+	"unsafe"
+
+	"github.com/pkg/errors"
+	"golang.org/x/sys/unix"
+)
+
+func getDeviceLogicalBlockSizeInner(fd uintptr) (int64, error) {
+	var bs int64
+	_, _, serr := unix.Syscall(unix.SYS_IOCTL, fd, unix.BLKSSZGET, uintptr(unsafe.Pointer(&bs)))
+	if serr != 0 {
+		return 0, errors.Wrap(serr, "syscall get logical block size")
+	}
+
+	return int64(bs), nil
+}