def_blk_fops     2121 fs/block_dev.c const struct file_operations def_blk_fops = {
def_blk_fops     2033 fs/inode.c     		inode->i_fop = &def_blk_fops;
def_blk_fops       16 fs/no-block.c  const struct file_operations def_blk_fops = {
def_blk_fops     2625 include/linux/fs.h extern const struct file_operations def_blk_fops;