]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
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" | |
16f7e0fe | 11 | #include <linux/capability.h> |
1da177e4 LT |
12 | #include <linux/time.h> |
13 | #include <linux/sched.h> | |
e322ff07 DH |
14 | #include <linux/compat.h> |
15 | #include <linux/smp_lock.h> | |
1da177e4 LT |
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; | |
a686cd89 | 25 | unsigned short rsv_window_size; |
1da177e4 LT |
26 | |
27 | ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); | |
28 | ||
29 | switch (cmd) { | |
30 | case EXT2_IOC_GETFLAGS: | |
4f99ed67 | 31 | ext2_get_inode_flags(ei); |
1da177e4 LT |
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 | ||
3bd858ab | 40 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
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 | ||
93f210dd | 49 | mutex_lock(&inode->i_mutex); |
e47776a0 JK |
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 | } | |
1da177e4 LT |
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)) { | |
93f210dd AM |
64 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
65 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 66 | return -EPERM; |
93f210dd | 67 | } |
1da177e4 LT |
68 | } |
69 | ||
70 | flags = flags & EXT2_FL_USER_MODIFIABLE; | |
71 | flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; | |
72 | ei->i_flags = flags; | |
93f210dd | 73 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
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: | |
3bd858ab | 83 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
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; | |
a686cd89 MB |
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 | } | |
1da177e4 LT |
136 | default: |
137 | return -ENOTTY; | |
138 | } | |
139 | } | |
e322ff07 DH |
140 | |
141 | #ifdef CONFIG_COMPAT | |
142 | long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
143 | { | |
c29c6934 | 144 | struct inode *inode = file->f_path.dentry->d_inode; |
e322ff07 DH |
145 | int ret; |
146 | ||
147 | /* These are just misnamed, they actually get/put from/to user an int */ | |
148 | switch (cmd) { | |
149 | case EXT2_IOC32_GETFLAGS: | |
150 | cmd = EXT2_IOC_GETFLAGS; | |
151 | break; | |
152 | case EXT2_IOC32_SETFLAGS: | |
153 | cmd = EXT2_IOC_SETFLAGS; | |
154 | break; | |
155 | case EXT2_IOC32_GETVERSION: | |
156 | cmd = EXT2_IOC_GETVERSION; | |
157 | break; | |
158 | case EXT2_IOC32_SETVERSION: | |
159 | cmd = EXT2_IOC_SETVERSION; | |
160 | break; | |
161 | default: | |
162 | return -ENOIOCTLCMD; | |
163 | } | |
164 | lock_kernel(); | |
165 | ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); | |
166 | unlock_kernel(); | |
167 | return ret; | |
168 | } | |
169 | #endif |