DM_DEV_SUSPEND_CMD 1678 drivers/md/dm-ioctl.c {DM_DEV_SUSPEND_CMD, IOCTL_FLAGS_NO_PARAMS, dev_suspend}, DM_DEV_SUSPEND_CMD 258 include/uapi/linux/dm-ioctl.h #define DM_DEV_SUSPEND _IOWR(DM_IOCTL, DM_DEV_SUSPEND_CMD, struct dm_ioctl)