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/mount.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 int ret;
27
28 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
29
30 switch (cmd) {
31 case EXT2_IOC_GETFLAGS:
32 ext2_get_inode_flags(ei);
33 flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
34 return put_user(flags, (int __user *) arg);
35 case EXT2_IOC_SETFLAGS: {
36 unsigned int oldflags;
37
38 ret = mnt_want_write(filp->f_path.mnt);
39 if (ret)
40 return ret;
41
42 if (!is_owner_or_cap(inode)) {
43 ret = -EACCES;
44 goto setflags_out;
45 }
46
47 if (get_user(flags, (int __user *) arg)) {
48 ret = -EFAULT;
49 goto setflags_out;
50 }
51
52 flags = ext2_mask_flags(inode->i_mode, flags);
53
54 mutex_lock(&inode->i_mutex);
55 /* Is it quota file? Do not allow user to mess with it */
56 if (IS_NOQUOTA(inode)) {
57 mutex_unlock(&inode->i_mutex);
58 ret = -EPERM;
59 goto setflags_out;
60 }
61 oldflags = ei->i_flags;
62
63 /*
64 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
65 * the relevant capability.
66 *
67 * This test looks nicer. Thanks to Pauline Middelink
68 */
69 if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
70 if (!capable(CAP_LINUX_IMMUTABLE)) {
71 mutex_unlock(&inode->i_mutex);
72 ret = -EPERM;
73 goto setflags_out;
74 }
75 }
76
77 flags = flags & EXT2_FL_USER_MODIFIABLE;
78 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
79 ei->i_flags = flags;
80 mutex_unlock(&inode->i_mutex);
81
82 ext2_set_inode_flags(inode);
83 inode->i_ctime = CURRENT_TIME_SEC;
84 mark_inode_dirty(inode);
85 setflags_out:
86 mnt_drop_write(filp->f_path.mnt);
87 return ret;
88 }
89 case EXT2_IOC_GETVERSION:
90 return put_user(inode->i_generation, (int __user *) arg);
91 case EXT2_IOC_SETVERSION:
92 if (!is_owner_or_cap(inode))
93 return -EPERM;
94 ret = mnt_want_write(filp->f_path.mnt);
95 if (ret)
96 return ret;
97 if (get_user(inode->i_generation, (int __user *) arg)) {
98 ret = -EFAULT;
99 } else {
100 inode->i_ctime = CURRENT_TIME_SEC;
101 mark_inode_dirty(inode);
102 }
103 mnt_drop_write(filp->f_path.mnt);
104 return ret;
105 case EXT2_IOC_GETRSVSZ:
106 if (test_opt(inode->i_sb, RESERVATION)
107 && S_ISREG(inode->i_mode)
108 && ei->i_block_alloc_info) {
109 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
110 return put_user(rsv_window_size, (int __user *)arg);
111 }
112 return -ENOTTY;
113 case EXT2_IOC_SETRSVSZ: {
114
115 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
116 return -ENOTTY;
117
118 if (!is_owner_or_cap(inode))
119 return -EACCES;
120
121 if (get_user(rsv_window_size, (int __user *)arg))
122 return -EFAULT;
123
124 ret = mnt_want_write(filp->f_path.mnt);
125 if (ret)
126 return ret;
127
128 if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
129 rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
130
131 /*
132 * need to allocate reservation structure for this inode
133 * before set the window size
134 */
135 /*
136 * XXX What lock should protect the rsv_goal_size?
137 * Accessed in ext2_get_block only. ext3 uses i_truncate.
138 */
139 mutex_lock(&ei->truncate_mutex);
140 if (!ei->i_block_alloc_info)
141 ext2_init_block_alloc_info(inode);
142
143 if (ei->i_block_alloc_info){
144 struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
145 rsv->rsv_goal_size = rsv_window_size;
146 }
147 mutex_unlock(&ei->truncate_mutex);
148 mnt_drop_write(filp->f_path.mnt);
149 return 0;
150 }
151 default:
152 return -ENOTTY;
153 }
154 }
155
156 #ifdef CONFIG_COMPAT
157 long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
158 {
159 /* These are just misnamed, they actually get/put from/to user an int */
160 switch (cmd) {
161 case EXT2_IOC32_GETFLAGS:
162 cmd = EXT2_IOC_GETFLAGS;
163 break;
164 case EXT2_IOC32_SETFLAGS:
165 cmd = EXT2_IOC_SETFLAGS;
166 break;
167 case EXT2_IOC32_GETVERSION:
168 cmd = EXT2_IOC_GETVERSION;
169 break;
170 case EXT2_IOC32_SETVERSION:
171 cmd = EXT2_IOC_SETVERSION;
172 break;
173 default:
174 return -ENOIOCTLCMD;
175 }
176 return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
177 }
178 #endif
179
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