2 * linux/fs/ext2/ioctl.c
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)
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 <linux/mount.h>
17 #include <asm/current.h>
18 #include <asm/uaccess.h>
21 int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
24 struct ext2_inode_info *ei = EXT2_I(inode);
27 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
30 case EXT2_IOC_GETFLAGS:
31 flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
32 return put_user(flags, (int __user *) arg);
33 case EXT2_IOC_SETFLAGS: {
34 unsigned int oldflags;
36 if (IS_RDONLY(inode) ||
37 (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
40 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
43 if (get_user(flags, (int __user *) arg))
46 if (!S_ISDIR(inode->i_mode))
47 flags &= ~EXT2_DIRSYNC_FL;
49 mutex_lock(&inode->i_mutex);
50 oldflags = ei->i_flags;
53 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
54 * the relevant capability.
56 * This test looks nicer. Thanks to Pauline Middelink
58 if ((oldflags & EXT2_IMMUTABLE_FL) ||
59 ((flags ^ oldflags) & (EXT2_APPEND_FL |
60 EXT2_IMMUTABLE_FL | EXT2_IUNLINK_FL))) {
61 if (!capable(CAP_LINUX_IMMUTABLE)) {
62 mutex_unlock(&inode->i_mutex);
67 flags = flags & EXT2_FL_USER_MODIFIABLE;
68 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
70 mutex_unlock(&inode->i_mutex);
72 ext2_set_inode_flags(inode);
73 inode->i_ctime = CURRENT_TIME_SEC;
74 mark_inode_dirty(inode);
77 case EXT2_IOC_GETVERSION:
78 return put_user(inode->i_generation, (int __user *) arg);
79 case EXT2_IOC_SETVERSION:
80 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
82 if (IS_RDONLY(inode) ||
83 (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
85 if (get_user(inode->i_generation, (int __user *) arg))
87 inode->i_ctime = CURRENT_TIME_SEC;
88 mark_inode_dirty(inode);
96 long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
98 struct inode *inode = file->f_path.dentry->d_inode;
101 /* These are just misnamed, they actually get/put from/to user an int */
103 case EXT2_IOC32_GETFLAGS:
104 cmd = EXT2_IOC_GETFLAGS;
106 case EXT2_IOC32_SETFLAGS:
107 cmd = EXT2_IOC_SETFLAGS;
109 case EXT2_IOC32_GETVERSION:
110 cmd = EXT2_IOC_GETVERSION;
112 case EXT2_IOC32_SETVERSION:
113 cmd = EXT2_IOC_SETVERSION;
119 ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));