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 long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
21 {
22 struct inode *inode = filp->f_dentry->d_inode;
23 struct ext2_inode_info *ei = EXT2_I(inode);
24 unsigned int flags;
25 unsigned short rsv_window_size;
26
27 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
28
29 switch (cmd) {
30 case EXT2_IOC_GETFLAGS:
31 ext2_get_inode_flags(ei);
32 flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
33 return put_user(flags, (int __user *) arg);
34 case EXT2_IOC_SETFLAGS: {
35 unsigned int oldflags;
36
37 if (IS_RDONLY(inode))
38 return -EROFS;
39
40 if (!is_owner_or_cap(inode))
41 return -EACCES;
42
43 if (get_user(flags, (int __user *) arg))
44 return -EFAULT;
45
46 if (!S_ISDIR(inode->i_mode))
47 flags &= ~EXT2_DIRSYNC_FL;
48
49 mutex_lock(&inode->i_mutex);
50 /* Is it quota file? Do not allow user to mess with it */
51 if (IS_NOQUOTA(inode)) {
52 mutex_unlock(&inode->i_mutex);
53 return -EPERM;
54 }
55 oldflags = ei->i_flags;
56
57 /*
58 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
59 * the relevant capability.
60 *
61 * This test looks nicer. Thanks to Pauline Middelink
62 */
63 if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
64 if (!capable(CAP_LINUX_IMMUTABLE)) {
65 mutex_unlock(&inode->i_mutex);
66 return -EPERM;
67 }
68 }
69
70 flags = flags & EXT2_FL_USER_MODIFIABLE;
71 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
72 ei->i_flags = flags;
73 mutex_unlock(&inode->i_mutex);
74
75 ext2_set_inode_flags(inode);
76 inode->i_ctime = CURRENT_TIME_SEC;
77 mark_inode_dirty(inode);
78 return 0;
79 }
80 case EXT2_IOC_GETVERSION:
81 return put_user(inode->i_generation, (int __user *) arg);
82 case EXT2_IOC_SETVERSION:
83 if (!is_owner_or_cap(inode))
84 return -EPERM;
85 if (IS_RDONLY(inode))
86 return -EROFS;
87 if (get_user(inode->i_generation, (int __user *) arg))
88 return -EFAULT;
89 inode->i_ctime = CURRENT_TIME_SEC;
90 mark_inode_dirty(inode);
91 return 0;
92 case EXT2_IOC_GETRSVSZ:
93 if (test_opt(inode->i_sb, RESERVATION)
94 && S_ISREG(inode->i_mode)
95 && ei->i_block_alloc_info) {
96 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
97 return put_user(rsv_window_size, (int __user *)arg);
98 }
99 return -ENOTTY;
100 case EXT2_IOC_SETRSVSZ: {
101
102 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
103 return -ENOTTY;
104
105 if (IS_RDONLY(inode))
106 return -EROFS;
107
108 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
109 return -EACCES;
110
111 if (get_user(rsv_window_size, (int __user *)arg))
112 return -EFAULT;
113
114 if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
115 rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
116
117 /*
118 * need to allocate reservation structure for this inode
119 * before set the window size
120 */
121 /*
122 * XXX What lock should protect the rsv_goal_size?
123 * Accessed in ext2_get_block only. ext3 uses i_truncate.
124 */
125 mutex_lock(&ei->truncate_mutex);
126 if (!ei->i_block_alloc_info)
127 ext2_init_block_alloc_info(inode);
128
129 if (ei->i_block_alloc_info){
130 struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
131 rsv->rsv_goal_size = rsv_window_size;
132 }
133 mutex_unlock(&ei->truncate_mutex);
134 return 0;
135 }
136 default:
137 return -ENOTTY;
138 }
139 }
140
141 #ifdef CONFIG_COMPAT
142 long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
143 {
144 /* These are just misnamed, they actually get/put from/to user an int */
145 switch (cmd) {
146 case EXT2_IOC32_GETFLAGS:
147 cmd = EXT2_IOC_GETFLAGS;
148 break;
149 case EXT2_IOC32_SETFLAGS:
150 cmd = EXT2_IOC_SETFLAGS;
151 break;
152 case EXT2_IOC32_GETVERSION:
153 cmd = EXT2_IOC_GETVERSION;
154 break;
155 case EXT2_IOC32_SETVERSION:
156 cmd = EXT2_IOC_SETVERSION;
157 break;
158 default:
159 return -ENOIOCTLCMD;
160 }
161 return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
162 }
163 #endif
164
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