[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 <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;
}
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>
	15
	16	#include <asm/uaccess.h>
	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;
0f7fc9e4	48	struct inode * inode = filp->f_path.dentry->d_inode;
1da177e4 LT	49	int __user p = (int __user )arg;
	50
	51	switch (cmd) {
	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	if ((error = get_user(block, p)) != 0)
	62	return error;
	63
	64	lock_kernel();
	65	res = mapping->a_ops->bmap(mapping, block);
	66	unlock_kernel();
	67	return put_user(res, p);
	68	}
	69	case FIGETBSZ:
1da177e4 LT	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);
	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	*/
	85	int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long arg)
	86	{
	87	unsigned int flag;
	88	int on, error = 0;
	89
	90	switch (cmd) {
	91	case FIOCLEX:
	92	set_close_on_exec(fd, 1);
	93	break;
	94
	95	case FIONCLEX:
	96	set_close_on_exec(fd, 0);
	97	break;
	98
	99	case FIONBIO:
	100	if ((error = get_user(on, (int __user *)arg)) != 0)
	101	break;
	102	flag = O_NONBLOCK;
	103	#ifdef __sparc__
	104	/* SunOS compatibility item. */
	105	if(O_NONBLOCK != O_NDELAY)
	106	flag \|= O_NDELAY;
	107	#endif
	108	if (on)
	109	filp->f_flags \|= flag;
	110	else
	111	filp->f_flags &= ~flag;
	112	break;
	113
	114	case FIOASYNC:
	115	if ((error = get_user(on, (int __user *)arg)) != 0)
	116	break;
	117	flag = on ? FASYNC : 0;
	118
	119	/* Did FASYNC state change ? */
	120	if ((flag ^ filp->f_flags) & FASYNC) {
	121	if (filp->f_op && filp->f_op->fasync) {
	122	lock_kernel();
	123	error = filp->f_op->fasync(fd, filp, on);
	124	unlock_kernel();
	125	}
	126	else error = -ENOTTY;
	127	}
	128	if (error != 0)
	129	break;
	130
	131	if (on)
	132	filp->f_flags \|= FASYNC;
	133	else
134	filp->f_flags &= ~FASYNC;
135	break;
136
137	case FIOQSIZE:
0f7fc9e4 JJS	138	if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) \|\|
	139	S_ISREG(filp->f_path.dentry->d_inode->i_mode) \|\|
	140	S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
	141	loff_t res = inode_get_bytes(filp->f_path.dentry->d_inode);
1da177e4 LT	142	error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0;
	143	}
	144	else
	145	error = -ENOTTY;
	146	break;
	147	default:
0f7fc9e4	148	if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
1da177e4 LT	149	error = file_ioctl(filp, cmd, arg);
	150	else
	151	error = do_ioctl(filp, cmd, arg);
	152	break;
	153	}
	154	return error;
	155	}
	156
	157	asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
	158	{
	159	struct file * filp;
	160	int error = -EBADF;
	161	int fput_needed;
	162
	163	filp = fget_light(fd, &fput_needed);
	164	if (!filp)
	165	goto out;
	166
	167	error = security_file_ioctl(filp, cmd, arg);
	168	if (error)
	169	goto out_fput;
	170
	171	error = vfs_ioctl(filp, fd, cmd, arg);
	172	out_fput:
	173	fput_light(filp, fput_needed);
	174	out:
	175	return error;
	176	}