Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband
[linux-2.6] / fs / jfs / ioctl.c
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/ext2_fs.h>
10 #include <linux/ctype.h>
11 #include <linux/capability.h>
12 #include <linux/time.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
21 static struct {
22         long jfs_flag;
23         long ext2_flag;
24 } jfs_map[] = {
25         {JFS_NOATIME_FL, EXT2_NOATIME_FL},
26         {JFS_DIRSYNC_FL, EXT2_DIRSYNC_FL},
27         {JFS_SYNC_FL, EXT2_SYNC_FL},
28         {JFS_SECRM_FL, EXT2_SECRM_FL},
29         {JFS_UNRM_FL, EXT2_UNRM_FL},
30         {JFS_APPEND_FL, EXT2_APPEND_FL},
31         {JFS_IMMUTABLE_FL, EXT2_IMMUTABLE_FL},
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
54 int 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                 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
63                 flags = jfs_map_ext2(flags, 0);
64                 return put_user(flags, (int __user *) arg);
65         case JFS_IOC_SETFLAGS: {
66                 unsigned int oldflags;
67
68                 if (IS_RDONLY(inode))
69                         return -EROFS;
70
71                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
72                         return -EACCES;
73
74                 if (get_user(flags, (int __user *) arg))
75                         return -EFAULT;
76
77                 flags = jfs_map_ext2(flags, 1);
78                 if (!S_ISDIR(inode->i_mode))
79                         flags &= ~JFS_DIRSYNC_FL;
80
81                 oldflags = jfs_inode->mode2;
82
83                 /*
84                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
85                  * the relevant capability.
86                  */
87                 if ((oldflags & JFS_IMMUTABLE_FL) ||
88                         ((flags ^ oldflags) &
89                         (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
90                         if (!capable(CAP_LINUX_IMMUTABLE))
91                                 return -EPERM;
92                 }
93
94                 flags = flags & JFS_FL_USER_MODIFIABLE;
95                 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
96                 jfs_inode->mode2 = flags;
97
98                 jfs_set_inode_flags(inode);
99                 inode->i_ctime = CURRENT_TIME_SEC;
100                 mark_inode_dirty(inode);
101                 return 0;
102         }
103         default:
104                 return -ENOTTY;
105         }
106 }
107