Merge branch 'master' of git://oak/home/sfr/kernels/iseries/work
[linux-2.6] / fs / ext2 / ioctl.c
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"
11 #include <linux/capability.h>
12 #include <linux/time.h>
13 #include <linux/sched.h>
14 #include <linux/compat.h>
15 #include <linux/smp_lock.h>
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;
25
26         ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
27
28         switch (cmd) {
29         case EXT2_IOC_GETFLAGS:
30                 flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
31                 return put_user(flags, (int __user *) arg);
32         case EXT2_IOC_SETFLAGS: {
33                 unsigned int oldflags;
34
35                 if (IS_RDONLY(inode))
36                         return -EROFS;
37
38                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
39                         return -EACCES;
40
41                 if (get_user(flags, (int __user *) arg))
42                         return -EFAULT;
43
44                 if (!S_ISDIR(inode->i_mode))
45                         flags &= ~EXT2_DIRSYNC_FL;
46
47                 oldflags = ei->i_flags;
48
49                 /*
50                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
51                  * the relevant capability.
52                  *
53                  * This test looks nicer. Thanks to Pauline Middelink
54                  */
55                 if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
56                         if (!capable(CAP_LINUX_IMMUTABLE))
57                                 return -EPERM;
58                 }
59
60                 flags = flags & EXT2_FL_USER_MODIFIABLE;
61                 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
62                 ei->i_flags = flags;
63
64                 ext2_set_inode_flags(inode);
65                 inode->i_ctime = CURRENT_TIME_SEC;
66                 mark_inode_dirty(inode);
67                 return 0;
68         }
69         case EXT2_IOC_GETVERSION:
70                 return put_user(inode->i_generation, (int __user *) arg);
71         case EXT2_IOC_SETVERSION:
72                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
73                         return -EPERM;
74                 if (IS_RDONLY(inode))
75                         return -EROFS;
76                 if (get_user(inode->i_generation, (int __user *) arg))
77                         return -EFAULT; 
78                 inode->i_ctime = CURRENT_TIME_SEC;
79                 mark_inode_dirty(inode);
80                 return 0;
81         default:
82                 return -ENOTTY;
83         }
84 }
85
86 #ifdef CONFIG_COMPAT
87 long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
88 {
89         struct inode *inode = file->f_dentry->d_inode;
90         int ret;
91
92         /* These are just misnamed, they actually get/put from/to user an int */
93         switch (cmd) {
94         case EXT2_IOC32_GETFLAGS:
95                 cmd = EXT2_IOC_GETFLAGS;
96                 break;
97         case EXT2_IOC32_SETFLAGS:
98                 cmd = EXT2_IOC_SETFLAGS;
99                 break;
100         case EXT2_IOC32_GETVERSION:
101                 cmd = EXT2_IOC_GETVERSION;
102                 break;
103         case EXT2_IOC32_SETVERSION:
104                 cmd = EXT2_IOC_SETVERSION;
105                 break;
106         default:
107                 return -ENOIOCTLCMD;
108         }
109         lock_kernel();
110         ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
111         unlock_kernel();
112         return ret;
113 }
114 #endif