blob: 37db524882628dd3b4a4eed92b7a3243d6e61b60 [file] [log] [blame]
Herbert Poetzld9e90262006-02-22 14:14:58 -06001/*
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>
Herbert Poetzld9e90262006-02-22 14:14:58 -06009#include <linux/ctype.h>
10#include <linux/capability.h>
11#include <linux/time.h>
12#include <asm/current.h>
13#include <asm/uaccess.h>
14
15#include "jfs_incore.h"
16#include "jfs_dinode.h"
17#include "jfs_inode.h"
18
19
20static struct {
21 long jfs_flag;
22 long ext2_flag;
23} jfs_map[] = {
David Howells36695672006-08-29 19:06:16 +010024 {JFS_NOATIME_FL, FS_NOATIME_FL},
25 {JFS_DIRSYNC_FL, FS_DIRSYNC_FL},
26 {JFS_SYNC_FL, FS_SYNC_FL},
27 {JFS_SECRM_FL, FS_SECRM_FL},
28 {JFS_UNRM_FL, FS_UNRM_FL},
29 {JFS_APPEND_FL, FS_APPEND_FL},
30 {JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL},
Herbert Poetzld9e90262006-02-22 14:14:58 -060031 {0, 0},
32};
33
34static long jfs_map_ext2(unsigned long flags, int from)
35{
36 int index=0;
37 long mapped=0;
38
39 while (jfs_map[index].jfs_flag) {
40 if (from) {
41 if (jfs_map[index].ext2_flag & flags)
42 mapped |= jfs_map[index].jfs_flag;
43 } else {
44 if (jfs_map[index].jfs_flag & flags)
45 mapped |= jfs_map[index].ext2_flag;
46 }
47 index++;
48 }
49 return mapped;
50}
51
52
53int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
54 unsigned long arg)
55{
56 struct jfs_inode_info *jfs_inode = JFS_IP(inode);
57 unsigned int flags;
58
59 switch (cmd) {
60 case JFS_IOC_GETFLAGS:
61 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
62 flags = jfs_map_ext2(flags, 0);
63 return put_user(flags, (int __user *) arg);
64 case JFS_IOC_SETFLAGS: {
65 unsigned int oldflags;
66
67 if (IS_RDONLY(inode))
68 return -EROFS;
69
70 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
71 return -EACCES;
72
73 if (get_user(flags, (int __user *) arg))
74 return -EFAULT;
75
76 flags = jfs_map_ext2(flags, 1);
77 if (!S_ISDIR(inode->i_mode))
78 flags &= ~JFS_DIRSYNC_FL;
79
80 oldflags = jfs_inode->mode2;
81
82 /*
83 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
84 * the relevant capability.
85 */
86 if ((oldflags & JFS_IMMUTABLE_FL) ||
87 ((flags ^ oldflags) &
88 (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
89 if (!capable(CAP_LINUX_IMMUTABLE))
90 return -EPERM;
91 }
92
93 flags = flags & JFS_FL_USER_MODIFIABLE;
94 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
95 jfs_inode->mode2 = flags;
96
97 jfs_set_inode_flags(inode);
98 inode->i_ctime = CURRENT_TIME_SEC;
99 mark_inode_dirty(inode);
100 return 0;
101 }
102 default:
103 return -ENOTTY;
104 }
105}
106