[deliverable/linux.git] / fs / jfs / ioctl.c

/*
 * linux/fs/jfs/ioctl.c
 *
 * Copyright (C) 2006 Herbert Poetzl
 * adapted from Remy Card's ext2/ioctl.c
 */

#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/capability.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <asm/current.h>
#include <asm/uaccess.h>

#include "jfs_incore.h"
#include "jfs_dinode.h"
#include "jfs_inode.h"


static struct {
	long jfs_flag;
	long ext2_flag;
} jfs_map[] = {
	{JFS_NOATIME_FL,	FS_NOATIME_FL},
	{JFS_DIRSYNC_FL,	FS_DIRSYNC_FL},
	{JFS_SYNC_FL,		FS_SYNC_FL},
	{JFS_SECRM_FL,		FS_SECRM_FL},
	{JFS_UNRM_FL,		FS_UNRM_FL},
	{JFS_APPEND_FL,		FS_APPEND_FL},
	{JFS_IMMUTABLE_FL,	FS_IMMUTABLE_FL},
	{0, 0},
};

static long jfs_map_ext2(unsigned long flags, int from)
{
	int index=0;
	long mapped=0;

	while (jfs_map[index].jfs_flag) {
		if (from) {
			if (jfs_map[index].ext2_flag & flags)
				mapped |= jfs_map[index].jfs_flag;
		} else {
			if (jfs_map[index].jfs_flag & flags)
				mapped |= jfs_map[index].ext2_flag;
		}
		index++;
	}
	return mapped;
}


long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = filp->f_dentry->d_inode;
	struct jfs_inode_info *jfs_inode = JFS_IP(inode);
	unsigned int flags;

	switch (cmd) {
	case JFS_IOC_GETFLAGS:
		jfs_get_inode_flags(jfs_inode);
		flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
		flags = jfs_map_ext2(flags, 0);
		return put_user(flags, (int __user *) arg);
	case JFS_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;

		flags = jfs_map_ext2(flags, 1);
		if (!S_ISDIR(inode->i_mode))
			flags &= ~JFS_DIRSYNC_FL;

		/* Is it quota file? Do not allow user to mess with it */
		if (IS_NOQUOTA(inode))
			return -EPERM;

		/* Lock against other parallel changes of flags */
		mutex_lock(&inode->i_mutex);

		jfs_get_inode_flags(jfs_inode);
		oldflags = jfs_inode->mode2;

		/*
		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
		 * the relevant capability.
		 */
		if ((oldflags & JFS_IMMUTABLE_FL) ||
			((flags ^ oldflags) &
			(JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
			if (!capable(CAP_LINUX_IMMUTABLE)) {
				mutex_unlock(&inode->i_mutex);
				return -EPERM;
			}
		}

		flags = flags & JFS_FL_USER_MODIFIABLE;
		flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
		jfs_inode->mode2 = flags;

		jfs_set_inode_flags(inode);
		mutex_unlock(&inode->i_mutex);
		inode->i_ctime = CURRENT_TIME_SEC;
		mark_inode_dirty(inode);
		return 0;
	}
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	/* While these ioctl numbers defined with 'long' and have different
	 * numbers than the 64bit ABI,
	 * the actual implementation only deals with ints and is compatible.
	 */
	switch (cmd) {
	case JFS_IOC_GETFLAGS32:
		cmd = JFS_IOC_GETFLAGS;
		break;
	case JFS_IOC_SETFLAGS32:
		cmd = JFS_IOC_SETFLAGS;
		break;
	}
	return jfs_ioctl(filp, cmd, arg);
}
#endif
Commit	Line	Data
d9e90266 HP	1	/*
	2	* linux/fs/jfs/ioctl.c
	3	*
	4	* Copyright (C) 2006 Herbert Poetzl
	5	* adapted from Remy Card's ext2/ioctl.c
	6	*/
	7
	8	#include <linux/fs.h>
d9e90266 HP	9	#include <linux/ctype.h>
	10	#include <linux/capability.h>
	11	#include <linux/time.h>
914e2637	12	#include <linux/sched.h>
d9e90266 HP	13	#include <asm/current.h>
	14	#include <asm/uaccess.h>
	15
	16	#include "jfs_incore.h"
	17	#include "jfs_dinode.h"
	18	#include "jfs_inode.h"
	19
	20
	21	static struct {
	22	long jfs_flag;
	23	long ext2_flag;
	24	} jfs_map[] = {
36695673 DH	25	{JFS_NOATIME_FL, FS_NOATIME_FL},
	26	{JFS_DIRSYNC_FL, FS_DIRSYNC_FL},
	27	{JFS_SYNC_FL, FS_SYNC_FL},
	28	{JFS_SECRM_FL, FS_SECRM_FL},
	29	{JFS_UNRM_FL, FS_UNRM_FL},
	30	{JFS_APPEND_FL, FS_APPEND_FL},
	31	{JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL},
d9e90266 HP	32	{0, 0},
	33	};
	34
	35	static long jfs_map_ext2(unsigned long flags, int from)
	36	{
	37	int index=0;
	38	long mapped=0;
	39
	40	while (jfs_map[index].jfs_flag) {
	41	if (from) {
	42	if (jfs_map[index].ext2_flag & flags)
	43	mapped \|= jfs_map[index].jfs_flag;
	44	} else {
	45	if (jfs_map[index].jfs_flag & flags)
	46	mapped \|= jfs_map[index].ext2_flag;
	47	}
	48	index++;
	49	}
	50	return mapped;
	51	}
	52
	53
baab81fa	54	long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
d9e90266	55	{
baab81fa	56	struct inode *inode = filp->f_dentry->d_inode;
d9e90266 HP	57	struct jfs_inode_info *jfs_inode = JFS_IP(inode);
	58	unsigned int flags;
	59
	60	switch (cmd) {
	61	case JFS_IOC_GETFLAGS:
3e2221c7	62	jfs_get_inode_flags(jfs_inode);
d9e90266 HP	63	flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
	64	flags = jfs_map_ext2(flags, 0);
	65	return put_user(flags, (int __user *) arg);
	66	case JFS_IOC_SETFLAGS: {
	67	unsigned int oldflags;
	68
	69	if (IS_RDONLY(inode))
	70	return -EROFS;
	71
3bd858ab	72	if (!is_owner_or_cap(inode))
d9e90266 HP	73	return -EACCES;
	74
	75	if (get_user(flags, (int __user *) arg))
	76	return -EFAULT;
	77
	78	flags = jfs_map_ext2(flags, 1);
	79	if (!S_ISDIR(inode->i_mode))
	80	flags &= ~JFS_DIRSYNC_FL;
	81
e47776a0 JK	82	/* Is it quota file? Do not allow user to mess with it */
	83	if (IS_NOQUOTA(inode))
	84	return -EPERM;
baab81fa AK	85
	86	/* Lock against other parallel changes of flags */
	87	mutex_lock(&inode->i_mutex);
	88
3e2221c7	89	jfs_get_inode_flags(jfs_inode);
d9e90266 HP	90	oldflags = jfs_inode->mode2;
	91
	92	/*
	93	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	94	* the relevant capability.
	95	*/
	96	if ((oldflags & JFS_IMMUTABLE_FL) \|\|
	97	((flags ^ oldflags) &
	98	(JFS_APPEND_FL \| JFS_IMMUTABLE_FL))) {
baab81fa AK	99	if (!capable(CAP_LINUX_IMMUTABLE)) {
baab81fa AK	100	mutex_unlock(&inode->i_mutex);
d9e90266	101	return -EPERM;
baab81fa	102	}
d9e90266 HP	103	}
	104
	105	flags = flags & JFS_FL_USER_MODIFIABLE;
	106	flags \|= oldflags & ~JFS_FL_USER_MODIFIABLE;
	107	jfs_inode->mode2 = flags;
	108
	109	jfs_set_inode_flags(inode);
baab81fa	110	mutex_unlock(&inode->i_mutex);
d9e90266 HP	111	inode->i_ctime = CURRENT_TIME_SEC;
	112	mark_inode_dirty(inode);
	113	return 0;
	114	}
	115	default:
	116	return -ENOTTY;
	117	}
	118	}
	119
ef1fc2f0 AK	120	#ifdef CONFIG_COMPAT
	121	long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	122	{
	123	/* While these ioctl numbers defined with 'long' and have different
	124	* numbers than the 64bit ABI,
	125	* the actual implementation only deals with ints and is compatible.
	126	*/
	127	switch (cmd) {
	128	case JFS_IOC_GETFLAGS32:
	129	cmd = JFS_IOC_GETFLAGS;
	130	break;
	131	case JFS_IOC_SETFLAGS32:
	132	cmd = JFS_IOC_SETFLAGS;
	133	break;
	134	}
	135	return jfs_ioctl(filp, cmd, arg);
	136	}
	137	#endif