set_device_ro    1575 block/genhd.c  EXPORT_SYMBOL(set_device_ro);
set_device_ro     455 block/ioctl.c  	set_device_ro(bdev, n);
set_device_ro    1012 drivers/block/loop.c 	set_device_ro(bdev, (lo_flags & LO_FLAGS_READ_ONLY) != 0);
set_device_ro     441 include/linux/genhd.h extern void set_device_ro(struct block_device *bdev, int flag);