floppy_open
.open = floppy_open,
ret = floppy_open(disk, mode);
static int floppy_open(struct gendisk *disk, blk_mode_t mode);
.open = floppy_open,
ret = floppy_open(disk, mode);
ret = floppy_open(disk, mode);
static int floppy_open(struct gendisk *disk, blk_mode_t mode);