Function BlockDiskSizeBytes

internal/server/storage/drivers/utils.go:805–832

BlockDiskSizeBytes returns the size of a block disk (path can be either block device or raw file).

(blockDiskPath string)

// BlockDiskSizeBytes returns the size of a block disk (path can be either block device or raw file).
func BlockDiskSizeBytes(blockDiskPath string) (int64, error) {
	if linux.IsBlockdevPath(blockDiskPath) {
		// Attempt to open the device path.
		f, err := os.Open(blockDiskPath)
		if err != nil {
			return -1, err
		}

		defer logger.WarnOnError(f.Close, "Failed to close file")
		fd := int(f.Fd())

		// Retrieve the block device size.
		res, err := unix.IoctlGetInt(fd, unix.BLKGETSIZE64)
		if err != nil {
			return -1, err
		}

		return int64(res), nil
	}

	// Block device is assumed to be a raw file.
	fi, err := os.Lstat(blockDiskPath)
	if err != nil {
		return -1, err
	}

	return fi.Size(), nil
}

// GetPhysicalBlockSize returns the physical block size for the device.
func GetPhysicalBlockSize(blockDiskPath string) (int, error) {