5d5d17522f
Target definitions of btrfs ioctls in 'syscall_defs.h' use the value BTRFS_IOCTL_MAGIC that is defined header 'btrfs.h'. This header is not available in kernel versions before 3.9. For that reason, these target ioctl definitions should be enwrapped in an #ifdef directive to check whether the 'btrfs.h' header is available as to not cause build errors on older Linux systems. Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20200905163802.2666-1-Filip.Bozuta@syrmia.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>