[GitHub/mt8127/android_kernel_alcatel_ttab.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/smp_lock.h>
#include <asm/current.h>
#include <asm/uaccess.h>


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

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

	switch (cmd) {
	case EXT2_IOC_GETFLAGS:
		ext2_get_inode_flags(ei);
		flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case EXT2_IOC_SETFLAGS: {
		unsigned int oldflags;

		if (IS_RDONLY(inode))
			return -EROFS;

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

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

		if (!S_ISDIR(inode->i_mode))
			flags &= ~EXT2_DIRSYNC_FL;

		mutex_lock(&inode->i_mutex);
		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)) {
				mutex_unlock(&inode->i_mutex);
				return -EPERM;
			}
		}

		flags = flags & EXT2_FL_USER_MODIFIABLE;
		flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
		ei->i_flags = flags;
		mutex_unlock(&inode->i_mutex);

		ext2_set_inode_flags(inode);
		inode->i_ctime = CURRENT_TIME_SEC;
		mark_inode_dirty(inode);
		return 0;
	}
	case EXT2_IOC_GETVERSION:
		return put_user(inode->i_generation, (int __user *) arg);
	case EXT2_IOC_SETVERSION:
		if (!is_owner_or_cap(inode))
			return -EPERM;
		if (IS_RDONLY(inode))
			return -EROFS;
		if (get_user(inode->i_generation, (int __user *) arg))
			return -EFAULT;	
		inode->i_ctime = CURRENT_TIME_SEC;
		mark_inode_dirty(inode);
		return 0;
	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 (IS_RDONLY(inode))
			return -EROFS;

		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
			return -EACCES;

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

		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);
		return 0;
	}
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	int ret;

	/* 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;
	}
	lock_kernel();
	ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
	unlock_kernel();
	return ret;
}
#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 DH	14	#include <linux/compat.h>
e322ff07 DH	15	#include <linux/smp_lock.h>
1da177e4 LT	16	#include <asm/current.h>
	17	#include <asm/uaccess.h>
	18
	19
	20	int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
	21	unsigned long arg)
	22	{
	23	struct ext2_inode_info *ei = EXT2_I(inode);
	24	unsigned int flags;
a686cd89	25	unsigned short rsv_window_size;
1da177e4 LT	26
	27	ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
	28
	29	switch (cmd) {
	30	case EXT2_IOC_GETFLAGS:
4f99ed67	31	ext2_get_inode_flags(ei);
1da177e4 LT	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
	37	if (IS_RDONLY(inode))
	38	return -EROFS;
	39
3bd858ab	40	if (!is_owner_or_cap(inode))
1da177e4 LT	41	return -EACCES;
	42
	43	if (get_user(flags, (int __user *) arg))
	44	return -EFAULT;
	45
	46	if (!S_ISDIR(inode->i_mode))
	47	flags &= ~EXT2_DIRSYNC_FL;
	48
93f210dd	49	mutex_lock(&inode->i_mutex);
1da177e4 LT	50	oldflags = ei->i_flags;
	51
	52	/*
	53	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	54	* the relevant capability.
	55	*
	56	* This test looks nicer. Thanks to Pauline Middelink
	57	*/
	58	if ((flags ^ oldflags) & (EXT2_APPEND_FL \| EXT2_IMMUTABLE_FL)) {
93f210dd AM	59	if (!capable(CAP_LINUX_IMMUTABLE)) {
93f210dd AM	60	mutex_unlock(&inode->i_mutex);
1da177e4	61	return -EPERM;
93f210dd	62	}
1da177e4 LT	63	}
	64
	65	flags = flags & EXT2_FL_USER_MODIFIABLE;
	66	flags \|= oldflags & ~EXT2_FL_USER_MODIFIABLE;
	67	ei->i_flags = flags;
93f210dd	68	mutex_unlock(&inode->i_mutex);
1da177e4 LT	69
	70	ext2_set_inode_flags(inode);
	71	inode->i_ctime = CURRENT_TIME_SEC;
	72	mark_inode_dirty(inode);
	73	return 0;
	74	}
	75	case EXT2_IOC_GETVERSION:
	76	return put_user(inode->i_generation, (int __user *) arg);
	77	case EXT2_IOC_SETVERSION:
3bd858ab	78	if (!is_owner_or_cap(inode))
1da177e4 LT	79	return -EPERM;
	80	if (IS_RDONLY(inode))
	81	return -EROFS;
	82	if (get_user(inode->i_generation, (int __user *) arg))
	83	return -EFAULT;
	84	inode->i_ctime = CURRENT_TIME_SEC;
	85	mark_inode_dirty(inode);
	86	return 0;
a686cd89 MB	87	case EXT2_IOC_GETRSVSZ:
	88	if (test_opt(inode->i_sb, RESERVATION)
	89	&& S_ISREG(inode->i_mode)
	90	&& ei->i_block_alloc_info) {
	91	rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
	92	return put_user(rsv_window_size, (int __user *)arg);
	93	}
	94	return -ENOTTY;
	95	case EXT2_IOC_SETRSVSZ: {
	96
	97	if (!test_opt(inode->i_sb, RESERVATION) \|\|!S_ISREG(inode->i_mode))
	98	return -ENOTTY;
	99
	100	if (IS_RDONLY(inode))
	101	return -EROFS;
	102
	103	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
	104	return -EACCES;
	105
	106	if (get_user(rsv_window_size, (int __user *)arg))
	107	return -EFAULT;
	108
	109	if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
	110	rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
	111
	112	/*
	113	* need to allocate reservation structure for this inode
	114	* before set the window size
	115	*/
	116	/*
	117	* XXX What lock should protect the rsv_goal_size?
	118	* Accessed in ext2_get_block only. ext3 uses i_truncate.
	119	*/
	120	mutex_lock(&ei->truncate_mutex);
	121	if (!ei->i_block_alloc_info)
	122	ext2_init_block_alloc_info(inode);
	123
	124	if (ei->i_block_alloc_info){
	125	struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
	126	rsv->rsv_goal_size = rsv_window_size;
	127	}
	128	mutex_unlock(&ei->truncate_mutex);
	129	return 0;
	130	}
1da177e4 LT	131	default:
	132	return -ENOTTY;
	133	}
	134	}
e322ff07 DH	135
	136	#ifdef CONFIG_COMPAT
	137	long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	138	{
c29c6934	139	struct inode *inode = file->f_path.dentry->d_inode;
e322ff07 DH	140	int ret;
	141
	142	/* These are just misnamed, they actually get/put from/to user an int */
	143	switch (cmd) {
	144	case EXT2_IOC32_GETFLAGS:
	145	cmd = EXT2_IOC_GETFLAGS;
	146	break;
	147	case EXT2_IOC32_SETFLAGS:
	148	cmd = EXT2_IOC_SETFLAGS;
	149	break;
	150	case EXT2_IOC32_GETVERSION:
	151	cmd = EXT2_IOC_GETVERSION;
	152	break;
	153	case EXT2_IOC32_SETVERSION:
	154	cmd = EXT2_IOC_SETVERSION;
	155	break;
	156	default:
	157	return -ENOIOCTLCMD;
	158	}
	159	lock_kernel();
	160	ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
	161	unlock_kernel();
	162	return ret;
	163	}
	164	#endif