DM_DEV_RENAME_CMD 1677 drivers/md/dm-ioctl.c 		{DM_DEV_RENAME_CMD, IOCTL_FLAGS_ISSUE_GLOBAL_EVENT, dev_rename},
DM_DEV_RENAME_CMD  257 include/uapi/linux/dm-ioctl.h #define DM_DEV_RENAME    _IOWR(DM_IOCTL, DM_DEV_RENAME_CMD, struct dm_ioctl)