[linux-2.6-block.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/kallsyms.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;
	void *f;

	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 ((f = filp->f_op->ioctl)) {
		lock_kernel();
		if (!filp->f_op->ioctl) {
			printk("%s: ioctl %p disappeared\n", __FUNCTION__, f);
			print_symbol("symbol: %s\n", (unsigned long)f);
			dump_stack();
		} else {
			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;
}

/*
 * 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
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>
78ae87c3	15	#include <linux/kallsyms.h>
1da177e4 LT	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;
78ae87c3	24	void *f;
1da177e4 LT	25
	26	if (!filp->f_op)
	27	goto out;
	28
	29	if (filp->f_op->unlocked_ioctl) {
	30	error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
	31	if (error == -ENOIOCTLCMD)
	32	error = -EINVAL;
	33	goto out;
78ae87c3	34	} else if ((f = filp->f_op->ioctl)) {
1da177e4	35	lock_kernel();
78ae87c3 AM	36	if (!filp->f_op->ioctl) {
	37	printk("%s: ioctl %p disappeared\n", __FUNCTION__, f);
	38	print_symbol("symbol: %s\n", (unsigned long)f);
	39	dump_stack();
	40	} else {
	41	error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
	42	filp, cmd, arg);
	43	}
1da177e4 LT	44	unlock_kernel();
	45	}
	46
	47	out:
	48	return error;
	49	}
	50
	51	static int file_ioctl(struct file *filp, unsigned int cmd,
	52	unsigned long arg)
	53	{
	54	int error;
	55	int block;
0f7fc9e4	56	struct inode * inode = filp->f_path.dentry->d_inode;
1da177e4 LT	57	int __user p = (int __user )arg;
	58
	59	switch (cmd) {
	60	case FIBMAP:
	61	{
	62	struct address_space *mapping = filp->f_mapping;
	63	int res;
	64	/* do we support this mess? */
	65	if (!mapping->a_ops->bmap)
	66	return -EINVAL;
	67	if (!capable(CAP_SYS_RAWIO))
	68	return -EPERM;
	69	if ((error = get_user(block, p)) != 0)
	70	return error;
	71
	72	lock_kernel();
	73	res = mapping->a_ops->bmap(mapping, block);
	74	unlock_kernel();
	75	return put_user(res, p);
	76	}
	77	case FIGETBSZ:
1da177e4 LT	78	return put_user(inode->i_sb->s_blocksize, p);
	79	case FIONREAD:
	80	return put_user(i_size_read(inode) - filp->f_pos, p);
	81	}
	82
	83	return do_ioctl(filp, cmd, arg);
	84	}
	85
	86	/*
	87	* When you add any new common ioctls to the switches above and below
	88	* please update compat_sys_ioctl() too.
	89	*
	90	* vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
	91	* It's just a simple helper for sys_ioctl and compat_sys_ioctl.
	92	*/
	93	int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long arg)
	94	{
	95	unsigned int flag;
	96	int on, error = 0;
	97
	98	switch (cmd) {
	99	case FIOCLEX:
	100	set_close_on_exec(fd, 1);
	101	break;
	102
	103	case FIONCLEX:
	104	set_close_on_exec(fd, 0);
	105	break;
	106
	107	case FIONBIO:
	108	if ((error = get_user(on, (int __user *)arg)) != 0)
	109	break;
	110	flag = O_NONBLOCK;
	111	#ifdef __sparc__
	112	/* SunOS compatibility item. */
	113	if(O_NONBLOCK != O_NDELAY)
	114	flag \|= O_NDELAY;
	115	#endif
	116	if (on)
	117	filp->f_flags \|= flag;
	118	else
	119	filp->f_flags &= ~flag;
	120	break;
	121
	122	case FIOASYNC:
	123	if ((error = get_user(on, (int __user *)arg)) != 0)
	124	break;
	125	flag = on ? FASYNC : 0;
	126
	127	/* Did FASYNC state change ? */
	128	if ((flag ^ filp->f_flags) & FASYNC) {
	129	if (filp->f_op && filp->f_op->fasync) {
	130	lock_kernel();
	131	error = filp->f_op->fasync(fd, filp, on);
	132	unlock_kernel();
	133	}
	134	else error = -ENOTTY;
	135	}
	136	if (error != 0)
	137	break;
	138
	139	if (on)
	140	filp->f_flags \|= FASYNC;
	141	else
142	filp->f_flags &= ~FASYNC;
143	break;
144
145	case FIOQSIZE:
0f7fc9e4 JJS	146	if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) \|\|
	147	S_ISREG(filp->f_path.dentry->d_inode->i_mode) \|\|
	148	S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
	149	loff_t res = inode_get_bytes(filp->f_path.dentry->d_inode);
1da177e4 LT	150	error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0;
	151	}
	152	else
	153	error = -ENOTTY;
	154	break;
	155	default:
0f7fc9e4	156	if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
1da177e4 LT	157	error = file_ioctl(filp, cmd, arg);
	158	else
	159	error = do_ioctl(filp, cmd, arg);
	160	break;
	161	}
	162	return error;
	163	}
	164
	165	asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
	166	{
	167	struct file * filp;
	168	int error = -EBADF;
	169	int fput_needed;
	170
	171	filp = fget_light(fd, &fput_needed);
	172	if (!filp)
	173	goto out;
	174
	175	error = security_file_ioctl(filp, cmd, arg);
	176	if (error)
	177	goto out_fput;
	178
	179	error = vfs_ioctl(filp, fd, cmd, arg);
	180	out_fput:
	181	fput_light(filp, fput_needed);
	182	out:
	183	return error;
	184	}
	185
	186	/*
	187	* Platforms implementing 32 bit compatibility ioctl handlers in
	188	* modules need this exported
	189	*/
	190	#ifdef CONFIG_COMPAT
	191	EXPORT_SYMBOL(sys_ioctl);
	192	#endif