hdreg.h    8 block/compat_ioctl.c #include <linux/hdreg.h>
hdreg.h    4 block/ioctl.c  #include <linux/hdreg.h>
hdreg.h   10 fs/partitions/ibm.c #include <linux/hdreg.h>
hdreg.h   27 include/linux/raid/md.h #include <linux/hdreg.h>