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>
9#include <linux/ctype.h>
10#include <linux/capability.h>
11#include <linux/time.h>
12#include <linux/sched.h>
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
21static struct {
22	long jfs_flag;
23	long ext2_flag;
24} jfs_map[] = {
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},
32	{0, 0},
33};
34
35static 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
54int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
55		unsigned long arg)
56{
57	struct jfs_inode_info *jfs_inode = JFS_IP(inode);
58	unsigned int flags;
59
60	switch (cmd) {
61	case JFS_IOC_GETFLAGS:
62		jfs_get_inode_flags(jfs_inode);
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
72		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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
82		jfs_get_inode_flags(jfs_inode);
83		oldflags = jfs_inode->mode2;
84
85		/*
86		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
87		 * the relevant capability.
88		 */
89		if ((oldflags & JFS_IMMUTABLE_FL) ||
90			((flags ^ oldflags) &
91			(JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
92			if (!capable(CAP_LINUX_IMMUTABLE))
93				return -EPERM;
94		}
95
96		flags = flags & JFS_FL_USER_MODIFIABLE;
97		flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
98		jfs_inode->mode2 = flags;
99
100		jfs_set_inode_flags(inode);
101		inode->i_ctime = CURRENT_TIME_SEC;
102		mark_inode_dirty(inode);
103		return 0;
104	}
105	default:
106		return -ENOTTY;
107	}
108}
109