Subversion Repositories test_project

/*

 *  linux/fs/ioctl.c

 *

 *  Copyright (C) 1991, 1992  Linus Torvalds

 */

#include <linux/syscalls.h>

#include <linux/mm.h>

#include <linux/smp_lock.h>

#include <linux/capability.h>

#include <linux/file.h>

#include <linux/fs.h>

#include <linux/security.h>

#include <linux/module.h>

#include <asm/uaccess.h>

#include <asm/ioctls.h>

static long do_ioctl(struct file *filp, unsigned int cmd,

                unsigned long arg)

{

        int error = -ENOTTY;

        if (!filp->f_op)

                goto out;

        if (filp->f_op->unlocked_ioctl) {

                error = filp->f_op->unlocked_ioctl(filp, cmd, arg);

                if (error == -ENOIOCTLCMD)

                        error = -EINVAL;

                goto out;

        } else if (filp->f_op->ioctl) {

                lock_kernel();

                error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,

                                          filp, cmd, arg);

                unlock_kernel();

        }

 out:

        return error;

}

static int file_ioctl(struct file *filp, unsigned int cmd,

                unsigned long arg)

{

        int error;

        int block;

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

        int __user *p = (int __user *)arg;

        switch (cmd) {

                case FIBMAP:

                {

                        struct address_space *mapping = filp->f_mapping;

                        int res;

                        /* do we support this mess? */

                        if (!mapping->a_ops->bmap)

                                return -EINVAL;

                        if (!capable(CAP_SYS_RAWIO))

                                return -EPERM;

                        if ((error = get_user(block, p)) != 0)

                                return error;

                        lock_kernel();

                        res = mapping->a_ops->bmap(mapping, block);

                        unlock_kernel();

                        return put_user(res, p);

                }

                case FIGETBSZ:

                        return put_user(inode->i_sb->s_blocksize, p);

                case FIONREAD:

                        return put_user(i_size_read(inode) - filp->f_pos, p);

        }

        return do_ioctl(filp, cmd, arg);

}

/*

 * When you add any new common ioctls to the switches above and below

 * please update compat_sys_ioctl() too.

 *

 * vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.

 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.

 */

int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long arg)

{

        unsigned int flag;

        int on, error = 0;

        switch (cmd) {

                case FIOCLEX:

                        set_close_on_exec(fd, 1);

                        break;

                case FIONCLEX:

                        set_close_on_exec(fd, 0);

                        break;

                case FIONBIO:

                        if ((error = get_user(on, (int __user *)arg)) != 0)

                                break;

                        flag = O_NONBLOCK;

#ifdef __sparc__

                        /* SunOS compatibility item. */

                        if(O_NONBLOCK != O_NDELAY)

                                flag |= O_NDELAY;

#endif

                        if (on)

                                filp->f_flags |= flag;

                        else

                                filp->f_flags &= ~flag;

                        break;

                case FIOASYNC:

                        if ((error = get_user(on, (int __user *)arg)) != 0)

                                break;

                        flag = on ? FASYNC : 0;

                        /* Did FASYNC state change ? */

                        if ((flag ^ filp->f_flags) & FASYNC) {

                                if (filp->f_op && filp->f_op->fasync) {

                                        lock_kernel();

                                        error = filp->f_op->fasync(fd, filp, on);

                                        unlock_kernel();

                                }

                                else error = -ENOTTY;

                        }

                        if (error != 0)

                                break;

                        if (on)

                                filp->f_flags |= FASYNC;

                        else

                                filp->f_flags &= ~FASYNC;

                        break;

                case FIOQSIZE:

                        if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||

                            S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||

                            S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {

                                loff_t res = inode_get_bytes(filp->f_path.dentry->d_inode);

                                error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0;

                        }

                        else

                                error = -ENOTTY;

                        break;

                default:

                        if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))

                                error = file_ioctl(filp, cmd, arg);

                        else

                                error = do_ioctl(filp, cmd, arg);

                        break;

        }

        return error;

}

asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)

{

        struct file * filp;

        int error = -EBADF;

        int fput_needed;

        filp = fget_light(fd, &fput_needed);

        if (!filp)

                goto out;

        error = security_file_ioctl(filp, cmd, arg);

        if (error)

                goto out_fput;

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

 out_fput:

        fput_light(filp, fput_needed);

 out:

        return error;

}