taglinefilesource code
where80kernel/blk_drv/blk.h#define RO_IOCTLS(dev,where) \
where82kernel/blk_drv/blk.hset_device_ro((dev),get_fs_long((long *) (where))); return 0; \
where83kernel/blk_drv/blk.hcase BLKROGET: verify_area((void *) (where), sizeof(long)); \
where84kernel/blk_drv/blk.hput_fs_long(is_read_only(dev),(long *) (where)); return 0;