[net-next-2.6.git] / fs / ioctl.c

/*
 *  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 <linux/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;
		error = get_user(block, p);
		if (error)
			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:
		error = get_user(on, (int __user *)arg);
		if (error)
			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:
		error = get_user(on, (int __user *)arg);
		if (error)
			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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ioctl.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
1da177e4 LT	7	#include <linux/syscalls.h>
	8	#include <linux/mm.h>
	9	#include <linux/smp_lock.h>
16f7e0fe	10	#include <linux/capability.h>
1da177e4 LT	11	#include <linux/file.h>
	12	#include <linux/fs.h>
	13	#include <linux/security.h>
	14	#include <linux/module.h>
c9845ff1	15	#include <linux/uaccess.h>
1da177e4	16
1da177e4 LT	17	#include <asm/ioctls.h>
	18
	19	static long do_ioctl(struct file *filp, unsigned int cmd,
	20	unsigned long arg)
	21	{
	22	int error = -ENOTTY;
	23
	24	if (!filp->f_op)
	25	goto out;
	26
	27	if (filp->f_op->unlocked_ioctl) {
	28	error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
	29	if (error == -ENOIOCTLCMD)
	30	error = -EINVAL;
	31	goto out;
64d67d21	32	} else if (filp->f_op->ioctl) {
1da177e4	33	lock_kernel();
64d67d21 AM	34	error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
64d67d21 AM	35	filp, cmd, arg);
1da177e4 LT	36	unlock_kernel();
	37	}
	38
	39	out:
	40	return error;
	41	}
	42
	43	static int file_ioctl(struct file *filp, unsigned int cmd,
	44	unsigned long arg)
	45	{
	46	int error;
	47	int block;
c9845ff1	48	struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4 LT	49	int __user p = (int __user )arg;
	50
	51	switch (cmd) {
c9845ff1 EZ	52	case FIBMAP:
	53	{
	54	struct address_space *mapping = filp->f_mapping;
	55	int res;
	56	/* do we support this mess? */
	57	if (!mapping->a_ops->bmap)
	58	return -EINVAL;
	59	if (!capable(CAP_SYS_RAWIO))
	60	return -EPERM;
	61	error = get_user(block, p);
	62	if (error)
	63	return error;
	64	lock_kernel();
	65	res = mapping->a_ops->bmap(mapping, block);
	66	unlock_kernel();
	67	return put_user(res, p);
	68	}
	69	case FIGETBSZ:
	70	return put_user(inode->i_sb->s_blocksize, p);
	71	case FIONREAD:
	72	return put_user(i_size_read(inode) - filp->f_pos, p);
1da177e4 LT	73	}
	74
	75	return do_ioctl(filp, cmd, arg);
	76	}
	77
	78	/*
	79	* When you add any new common ioctls to the switches above and below
	80	* please update compat_sys_ioctl() too.
	81	*
	82	* vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
	83	* It's just a simple helper for sys_ioctl and compat_sys_ioctl.
	84	*/
c9845ff1 EZ	85	int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
c9845ff1 EZ	86	unsigned long arg)
1da177e4 LT	87	{
	88	unsigned int flag;
	89	int on, error = 0;
	90
	91	switch (cmd) {
c9845ff1 EZ	92	case FIOCLEX:
	93	set_close_on_exec(fd, 1);
	94	break;
1da177e4	95
c9845ff1 EZ	96	case FIONCLEX:
	97	set_close_on_exec(fd, 0);
	98	break;
1da177e4	99
c9845ff1 EZ	100	case FIONBIO:
	101	error = get_user(on, (int __user *)arg);
	102	if (error)
	103	break;
	104	flag = O_NONBLOCK;
1da177e4	105	#ifdef __sparc__
c9845ff1 EZ	106	/* SunOS compatibility item. */
	107	if (O_NONBLOCK != O_NDELAY)
	108	flag \|= O_NDELAY;
1da177e4	109	#endif
c9845ff1 EZ	110	if (on)
	111	filp->f_flags \|= flag;
	112	else
	113	filp->f_flags &= ~flag;
	114	break;
	115
	116	case FIOASYNC:
	117	error = get_user(on, (int __user *)arg);
	118	if (error)
1da177e4	119	break;
c9845ff1 EZ	120	flag = on ? FASYNC : 0;
	121
	122	/* Did FASYNC state change ? */
	123	if ((flag ^ filp->f_flags) & FASYNC) {
	124	if (filp->f_op && filp->f_op->fasync) {
	125	lock_kernel();
	126	error = filp->f_op->fasync(fd, filp, on);
	127	unlock_kernel();
	128	} else
1da177e4	129	error = -ENOTTY;
c9845ff1 EZ	130	}
c9845ff1 EZ	131	if (error != 0)
1da177e4	132	break;
c9845ff1 EZ	133
	134	if (on)
	135	filp->f_flags \|= FASYNC;
	136	else
	137	filp->f_flags &= ~FASYNC;
	138	break;
	139
	140	case FIOQSIZE:
	141	if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) \|\|
	142	S_ISREG(filp->f_path.dentry->d_inode->i_mode) \|\|
	143	S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
	144	loff_t res =
	145	inode_get_bytes(filp->f_path.dentry->d_inode);
	146	error = copy_to_user((loff_t __user *)arg, &res,
	147	sizeof(res)) ? -EFAULT : 0;
	148	} else
	149	error = -ENOTTY;
	150	break;
	151	default:
	152	if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
	153	error = file_ioctl(filp, cmd, arg);
	154	else
	155	error = do_ioctl(filp, cmd, arg);
	156	break;
1da177e4 LT	157	}
	158	return error;
	159	}
	160
	161	asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
	162	{
c9845ff1	163	struct file *filp;
1da177e4 LT	164	int error = -EBADF;
	165	int fput_needed;
	166
	167	filp = fget_light(fd, &fput_needed);
	168	if (!filp)
	169	goto out;
	170
	171	error = security_file_ioctl(filp, cmd, arg);
	172	if (error)
	173	goto out_fput;
	174
	175	error = vfs_ioctl(filp, fd, cmd, arg);
	176	out_fput:
	177	fput_light(filp, fput_needed);
	178	out:
	179	return error;
	180	}