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

/*
 *  linux/fs/ioctl.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/config.h>
#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_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_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:
			if (inode->i_sb == NULL)
				return -EBADF;
			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_dentry->d_inode->i_mode) ||
			    S_ISREG(filp->f_dentry->d_inode->i_mode) ||
			    S_ISLNK(filp->f_dentry->d_inode->i_mode)) {
				loff_t res = inode_get_bytes(filp->f_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_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;
}

/*
 * Platforms implementing 32 bit compatibility ioctl handlers in
 * modules need this exported
 */
#ifdef CONFIG_COMPAT
EXPORT_SYMBOL(sys_ioctl);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ioctl.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
	7	#include <linux/config.h>
	8	#include <linux/syscalls.h>
	9	#include <linux/mm.h>
	10	#include <linux/smp_lock.h>
16f7e0fe	11	#include <linux/capability.h>
1da177e4 LT	12	#include <linux/file.h>
	13	#include <linux/fs.h>
	14	#include <linux/security.h>
	15	#include <linux/module.h>
	16
	17	#include <asm/uaccess.h>
	18	#include <asm/ioctls.h>
	19
	20	static long do_ioctl(struct file *filp, unsigned int cmd,
	21	unsigned long arg)
	22	{
	23	int error = -ENOTTY;
	24
	25	if (!filp->f_op)
	26	goto out;
	27
	28	if (filp->f_op->unlocked_ioctl) {
	29	error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
	30	if (error == -ENOIOCTLCMD)
	31	error = -EINVAL;
	32	goto out;
	33	} else if (filp->f_op->ioctl) {
	34	lock_kernel();
	35	error = filp->f_op->ioctl(filp->f_dentry->d_inode,
	36	filp, cmd, arg);
	37	unlock_kernel();
	38	}
	39
	40	out:
	41	return error;
	42	}
	43
	44	static int file_ioctl(struct file *filp, unsigned int cmd,
	45	unsigned long arg)
	46	{
	47	int error;
	48	int block;
	49	struct inode * inode = filp->f_dentry->d_inode;
	50	int __user p = (int __user )arg;
	51
	52	switch (cmd) {
	53	case FIBMAP:
	54	{
	55	struct address_space *mapping = filp->f_mapping;
	56	int res;
	57	/* do we support this mess? */
	58	if (!mapping->a_ops->bmap)
	59	return -EINVAL;
	60	if (!capable(CAP_SYS_RAWIO))
	61	return -EPERM;
	62	if ((error = get_user(block, p)) != 0)
	63	return error;
	64
	65	lock_kernel();
	66	res = mapping->a_ops->bmap(mapping, block);
	67	unlock_kernel();
	68	return put_user(res, p);
	69	}
	70	case FIGETBSZ:
	71	if (inode->i_sb == NULL)
	72	return -EBADF;
	73	return put_user(inode->i_sb->s_blocksize, p);
	74	case FIONREAD:
	75	return put_user(i_size_read(inode) - filp->f_pos, p);
76	}
77
78	return do_ioctl(filp, cmd, arg);
79	}
80
81	/*
82	* When you add any new common ioctls to the switches above and below
83	* please update compat_sys_ioctl() too.
84	*
85	* vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
86	* It's just a simple helper for sys_ioctl and compat_sys_ioctl.
87	*/
88	int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long arg)
89	{
90	unsigned int flag;
91	int on, error = 0;
92
93	switch (cmd) {
94	case FIOCLEX:
95	set_close_on_exec(fd, 1);
96	break;
97
98	case FIONCLEX:
99	set_close_on_exec(fd, 0);
100	break;
101
102	case FIONBIO:
103	if ((error = get_user(on, (int __user *)arg)) != 0)
104	break;
105	flag = O_NONBLOCK;
106	#ifdef __sparc__
107	/* SunOS compatibility item. */
108	if(O_NONBLOCK != O_NDELAY)
109	flag \|= O_NDELAY;
110	#endif
111	if (on)
112	filp->f_flags \|= flag;
113	else
114	filp->f_flags &= ~flag;
115	break;
116
117	case FIOASYNC:
118	if ((error = get_user(on, (int __user *)arg)) != 0)
119	break;
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	}
129	else error = -ENOTTY;
130	}
131	if (error != 0)
132	break;
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_dentry->d_inode->i_mode) \|\|
142	S_ISREG(filp->f_dentry->d_inode->i_mode) \|\|
143	S_ISLNK(filp->f_dentry->d_inode->i_mode)) {
144	loff_t res = inode_get_bytes(filp->f_dentry->d_inode);
145	error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0;
146	}
147	else
148	error = -ENOTTY;
149	break;
150	default:
151	if (S_ISREG(filp->f_dentry->d_inode->i_mode))
152	error = file_ioctl(filp, cmd, arg);
153	else
154	error = do_ioctl(filp, cmd, arg);
155	break;
156	}
157	return error;
158	}
159
160	asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
161	{
162	struct file * filp;
163	int error = -EBADF;
164	int fput_needed;
165
166	filp = fget_light(fd, &fput_needed);
167	if (!filp)
168	goto out;
169
170	error = security_file_ioctl(filp, cmd, arg);
171	if (error)
172	goto out_fput;
173
174	error = vfs_ioctl(filp, fd, cmd, arg);
175	out_fput:
176	fput_light(filp, fput_needed);
177	out:
178	return error;
179	}
180
181	/*
182	* Platforms implementing 32 bit compatibility ioctl handlers in
183	* modules need this exported
184	*/
185	#ifdef CONFIG_COMPAT
186	EXPORT_SYMBOL(sys_ioctl);
187	#endif