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/time.h>
12 #include <linux/sched.h>
13 #include <asm/current.h>
14 #include <asm/uaccess.h>
15
16
17 int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
18 unsigned long arg)
19 {
20 struct ext2_inode_info *ei = EXT2_I(inode);
21 unsigned int flags;
22
23 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
24
25 switch (cmd) {
26 case EXT2_IOC_GETFLAGS:
27 flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
28 return put_user(flags, (int __user *) arg);
29 case EXT2_IOC_SETFLAGS: {
30 unsigned int oldflags;
31
32 if (IS_RDONLY(inode))
33 return -EROFS;
34
35 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
36 return -EACCES;
37
38 if (get_user(flags, (int __user *) arg))
39 return -EFAULT;
40
41 if (!S_ISDIR(inode->i_mode))
42 flags &= ~EXT2_DIRSYNC_FL;
43
44 oldflags = ei->i_flags;
45
46 /*
47 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
48 * the relevant capability.
49 *
50 * This test looks nicer. Thanks to Pauline Middelink
51 */
52 if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
53 if (!capable(CAP_LINUX_IMMUTABLE))
54 return -EPERM;
55 }
56
57 flags = flags & EXT2_FL_USER_MODIFIABLE;
58 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
59 ei->i_flags = flags;
60
61 ext2_set_inode_flags(inode);
62 inode->i_ctime = CURRENT_TIME_SEC;
63 mark_inode_dirty(inode);
64 return 0;
65 }
66 case EXT2_IOC_GETVERSION:
67 return put_user(inode->i_generation, (int __user *) arg);
68 case EXT2_IOC_SETVERSION:
69 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
70 return -EPERM;
71 if (IS_RDONLY(inode))
72 return -EROFS;
73 if (get_user(inode->i_generation, (int __user *) arg))
74 return -EFAULT;
75 inode->i_ctime = CURRENT_TIME_SEC;
76 mark_inode_dirty(inode);
77 return 0;
78 default:
79 return -ENOTTY;
80 }
81 }
82
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