[mirror_ubuntu-artful-kernel.git] / fs / ext2 / ioctl.c

/*
 * linux/fs/ext2/ioctl.c
 *
 * Copyright (C) 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 */

#include "ext2.h"
#include <linux/capability.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/compat.h>
#include <linux/mount.h>
#include <asm/current.h>
#include <linux/uaccess.h>


long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	struct ext2_inode_info *ei = EXT2_I(inode);
	unsigned int flags;
	unsigned short rsv_window_size;
	int ret;

	ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);

	switch (cmd) {
	case EXT2_IOC_GETFLAGS:
		flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case EXT2_IOC_SETFLAGS: {
		unsigned int oldflags;

		ret = mnt_want_write_file(filp);
		if (ret)
			return ret;

		if (!inode_owner_or_capable(inode)) {
			ret = -EACCES;
			goto setflags_out;
		}

		if (get_user(flags, (int __user *) arg)) {
			ret = -EFAULT;
			goto setflags_out;
		}

		flags = ext2_mask_flags(inode->i_mode, flags);

		inode_lock(inode);
		/* Is it quota file? Do not allow user to mess with it */
		if (IS_NOQUOTA(inode)) {
			inode_unlock(inode);
			ret = -EPERM;
			goto setflags_out;
		}
		oldflags = ei->i_flags;

		/*
		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
		 * the relevant capability.
		 *
		 * This test looks nicer. Thanks to Pauline Middelink
		 */
		if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
			if (!capable(CAP_LINUX_IMMUTABLE)) {
				inode_unlock(inode);
				ret = -EPERM;
				goto setflags_out;
			}
		}

		flags = flags & EXT2_FL_USER_MODIFIABLE;
		flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
		ei->i_flags = flags;

		ext2_set_inode_flags(inode);
		inode->i_ctime = current_time(inode);
		inode_unlock(inode);

		mark_inode_dirty(inode);
setflags_out:
		mnt_drop_write_file(filp);
		return ret;
	}
	case EXT2_IOC_GETVERSION:
		return put_user(inode->i_generation, (int __user *) arg);
	case EXT2_IOC_SETVERSION: {
		__u32 generation;

		if (!inode_owner_or_capable(inode))
			return -EPERM;
		ret = mnt_want_write_file(filp);
		if (ret)
			return ret;
		if (get_user(generation, (int __user *) arg)) {
			ret = -EFAULT;
			goto setversion_out;
		}

		inode_lock(inode);
		inode->i_ctime = current_time(inode);
		inode->i_generation = generation;
		inode_unlock(inode);

		mark_inode_dirty(inode);
setversion_out:
		mnt_drop_write_file(filp);
		return ret;
	}
	case EXT2_IOC_GETRSVSZ:
		if (test_opt(inode->i_sb, RESERVATION)
			&& S_ISREG(inode->i_mode)
			&& ei->i_block_alloc_info) {
			rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
			return put_user(rsv_window_size, (int __user *)arg);
		}
		return -ENOTTY;
	case EXT2_IOC_SETRSVSZ: {

		if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
			return -ENOTTY;

		if (!inode_owner_or_capable(inode))
			return -EACCES;

		if (get_user(rsv_window_size, (int __user *)arg))
			return -EFAULT;

		ret = mnt_want_write_file(filp);
		if (ret)
			return ret;

		if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
			rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;

		/*
		 * need to allocate reservation structure for this inode
		 * before set the window size
		 */
		/*
		 * XXX What lock should protect the rsv_goal_size?
		 * Accessed in ext2_get_block only.  ext3 uses i_truncate.
		 */
		mutex_lock(&ei->truncate_mutex);
		if (!ei->i_block_alloc_info)
			ext2_init_block_alloc_info(inode);

		if (ei->i_block_alloc_info){
			struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
			rsv->rsv_goal_size = rsv_window_size;
		}
		mutex_unlock(&ei->truncate_mutex);
		mnt_drop_write_file(filp);
		return 0;
	}
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	/* These are just misnamed, they actually get/put from/to user an int */
	switch (cmd) {
	case EXT2_IOC32_GETFLAGS:
		cmd = EXT2_IOC_GETFLAGS;
		break;
	case EXT2_IOC32_SETFLAGS:
		cmd = EXT2_IOC_SETFLAGS;
		break;
	case EXT2_IOC32_GETVERSION:
		cmd = EXT2_IOC_GETVERSION;
		break;
	case EXT2_IOC32_SETVERSION:
		cmd = EXT2_IOC_SETVERSION;
		break;
	default:
		return -ENOIOCTLCMD;
	}
	return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ext2/ioctl.c
	3	*
	4	* Copyright (C) 1993, 1994, 1995
	5	* Remy Card (card@masi.ibp.fr)
	6	* Laboratoire MASI - Institut Blaise Pascal
	7	* Universite Pierre et Marie Curie (Paris VI)
	8	*/
	9
	10	#include "ext2.h"
16f7e0fe	11	#include <linux/capability.h>
1da177e4 LT	12	#include <linux/time.h>
1da177e4 LT	13	#include <linux/sched.h>
e322ff07	14	#include <linux/compat.h>
42a74f20	15	#include <linux/mount.h>
1da177e4	16	#include <asm/current.h>
7c0f6ba6	17	#include <linux/uaccess.h>
1da177e4 LT	18
1da177e4 LT	19
14f9f7b2	20	long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1da177e4	21	{
496ad9aa	22	struct inode *inode = file_inode(filp);
1da177e4 LT	23	struct ext2_inode_info *ei = EXT2_I(inode);
1da177e4 LT	24	unsigned int flags;
a686cd89	25	unsigned short rsv_window_size;
42a74f20	26	int ret;
1da177e4 LT	27
	28	ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
	29
	30	switch (cmd) {
	31	case EXT2_IOC_GETFLAGS:
	32	flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
	33	return put_user(flags, (int __user *) arg);
	34	case EXT2_IOC_SETFLAGS: {
	35	unsigned int oldflags;
	36
a561be71	37	ret = mnt_want_write_file(filp);
42a74f20 DH	38	if (ret)
42a74f20 DH	39	return ret;
1da177e4	40
2e149670	41	if (!inode_owner_or_capable(inode)) {
42a74f20 DH	42	ret = -EACCES;
	43	goto setflags_out;
	44	}
1da177e4	45
42a74f20 DH	46	if (get_user(flags, (int __user *) arg)) {
	47	ret = -EFAULT;
	48	goto setflags_out;
	49	}
1da177e4	50
ef8b6461	51	flags = ext2_mask_flags(inode->i_mode, flags);
1da177e4	52
5955102c	53	inode_lock(inode);
e47776a0 JK	54	/* Is it quota file? Do not allow user to mess with it */
e47776a0 JK	55	if (IS_NOQUOTA(inode)) {
5955102c	56	inode_unlock(inode);
42a74f20 DH	57	ret = -EPERM;
42a74f20 DH	58	goto setflags_out;
e47776a0	59	}
1da177e4 LT	60	oldflags = ei->i_flags;
	61
	62	/*
	63	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	64	* the relevant capability.
	65	*
	66	* This test looks nicer. Thanks to Pauline Middelink
	67	*/
	68	if ((flags ^ oldflags) & (EXT2_APPEND_FL \| EXT2_IMMUTABLE_FL)) {
93f210dd	69	if (!capable(CAP_LINUX_IMMUTABLE)) {
5955102c	70	inode_unlock(inode);
42a74f20 DH	71	ret = -EPERM;
42a74f20 DH	72	goto setflags_out;
93f210dd	73	}
1da177e4 LT	74	}
	75
	76	flags = flags & EXT2_FL_USER_MODIFIABLE;
	77	flags \|= oldflags & ~EXT2_FL_USER_MODIFIABLE;
	78	ei->i_flags = flags;
	79
	80	ext2_set_inode_flags(inode);
02027d42	81	inode->i_ctime = current_time(inode);
5955102c	82	inode_unlock(inode);
34b07840	83
1da177e4	84	mark_inode_dirty(inode);
42a74f20	85	setflags_out:
2a79f17e	86	mnt_drop_write_file(filp);
42a74f20	87	return ret;
1da177e4 LT	88	}
	89	case EXT2_IOC_GETVERSION:
	90	return put_user(inode->i_generation, (int __user *) arg);
34b07840 DH	91	case EXT2_IOC_SETVERSION: {
	92	__u32 generation;
	93
2e149670	94	if (!inode_owner_or_capable(inode))
1da177e4	95	return -EPERM;
a561be71	96	ret = mnt_want_write_file(filp);
42a74f20 DH	97	if (ret)
42a74f20 DH	98	return ret;
34b07840	99	if (get_user(generation, (int __user *) arg)) {
42a74f20	100	ret = -EFAULT;
34b07840	101	goto setversion_out;
42a74f20	102	}
34b07840	103
5955102c	104	inode_lock(inode);
02027d42	105	inode->i_ctime = current_time(inode);
34b07840	106	inode->i_generation = generation;
5955102c	107	inode_unlock(inode);
34b07840 DH	108
	109	mark_inode_dirty(inode);
	110	setversion_out:
2a79f17e	111	mnt_drop_write_file(filp);
42a74f20	112	return ret;
34b07840	113	}
a686cd89 MB	114	case EXT2_IOC_GETRSVSZ:
	115	if (test_opt(inode->i_sb, RESERVATION)
	116	&& S_ISREG(inode->i_mode)
	117	&& ei->i_block_alloc_info) {
	118	rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
	119	return put_user(rsv_window_size, (int __user *)arg);
	120	}
	121	return -ENOTTY;
	122	case EXT2_IOC_SETRSVSZ: {
	123
	124	if (!test_opt(inode->i_sb, RESERVATION) \|\|!S_ISREG(inode->i_mode))
	125	return -ENOTTY;
	126
2e149670	127	if (!inode_owner_or_capable(inode))
a686cd89 MB	128	return -EACCES;
	129
	130	if (get_user(rsv_window_size, (int __user *)arg))
	131	return -EFAULT;
	132
a561be71	133	ret = mnt_want_write_file(filp);
42a74f20 DH	134	if (ret)
	135	return ret;
	136
a686cd89 MB	137	if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
	138	rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
	139
	140	/*
	141	* need to allocate reservation structure for this inode
	142	* before set the window size
	143	*/
	144	/*
	145	* XXX What lock should protect the rsv_goal_size?
	146	* Accessed in ext2_get_block only. ext3 uses i_truncate.
	147	*/
	148	mutex_lock(&ei->truncate_mutex);
	149	if (!ei->i_block_alloc_info)
	150	ext2_init_block_alloc_info(inode);
	151
	152	if (ei->i_block_alloc_info){
	153	struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
	154	rsv->rsv_goal_size = rsv_window_size;
	155	}
	156	mutex_unlock(&ei->truncate_mutex);
2a79f17e	157	mnt_drop_write_file(filp);
a686cd89 MB	158	return 0;
a686cd89 MB	159	}
1da177e4 LT	160	default:
	161	return -ENOTTY;
	162	}
	163	}
e322ff07 DH	164
	165	#ifdef CONFIG_COMPAT
	166	long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	167	{
e322ff07 DH	168	/* These are just misnamed, they actually get/put from/to user an int */
	169	switch (cmd) {
	170	case EXT2_IOC32_GETFLAGS:
	171	cmd = EXT2_IOC_GETFLAGS;
	172	break;
	173	case EXT2_IOC32_SETFLAGS:
	174	cmd = EXT2_IOC_SETFLAGS;
	175	break;
	176	case EXT2_IOC32_GETVERSION:
	177	cmd = EXT2_IOC_GETVERSION;
	178	break;
	179	case EXT2_IOC32_SETVERSION:
	180	cmd = EXT2_IOC_SETVERSION;
	181	break;
	182	default:
	183	return -ENOIOCTLCMD;
	184	}
14f9f7b2	185	return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
e322ff07 DH	186	}
e322ff07 DH	187	#endif