546 int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,

 547             unsigned long arg)

 548 {

 549        int error = 0;

 550        int __user *argp = (int __user *)arg;

 551        struct inode *inode = filp->f_path.dentry->d_inode;

 552

 553        switch (cmd) {

 554        case FIOCLEX:

 555                set_close_on_exec(fd, 1);

 556                break;

 557

 558        case FIONCLEX:

 559                set_close_on_exec(fd, 0);

 560                break;

 561

 562        case FIONBIO:

 563                error = ioctl_fionbio(filp, argp);

 564                break;

 565

 566        case FIOASYNC:

 567                error = ioctl_fioasync(fd, filp, argp);

 568                break;

 569

 570        case FIOQSIZE:

 571                if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||

 572                    S_ISLNK(inode->i_mode)) {

 573                        loff_t res = inode_get_bytes(inode);

 574                        error = copy_to_user(argp, &res, sizeof(res)) ?

 575                                        -EFAULT : 0;

 576                } else

 577                        error = -ENOTTY;

 578                break;

 579

 580        case FIFREEZE:

 581                error = ioctl_fsfreeze(filp);

 582                break;

 583

 584        case FITHAW:

 585                error = ioctl_fsthaw(filp);

 586                break;

 587

 588        case FS_IOC_FIEMAP:

 589                return ioctl_fiemap(filp, arg);

 590

 591        case FIGETBSZ:

 592                return put_user(inode->i_sb->s_blocksize, argp);

 593

 594        default:

 595                if (S_ISREG(inode->i_mode))

 596                        error = file_ioctl(filp, cmd, arg);

 597                else

 598                        error = vfs_ioctl(filp, cmd, arg);

 599                break;

 600        }

 601        return error;