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Commit | Line | Data |
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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 | 14 | #include <linux/compat.h> |
42a74f20 | 15 | #include <linux/mount.h> |
e322ff07 | 16 | #include <linux/smp_lock.h> |
1da177e4 LT |
17 | #include <asm/current.h> |
18 | #include <asm/uaccess.h> | |
19 | ||
20 | ||
14f9f7b2 | 21 | long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 22 | { |
14f9f7b2 | 23 | struct inode *inode = filp->f_dentry->d_inode; |
1da177e4 LT |
24 | struct ext2_inode_info *ei = EXT2_I(inode); |
25 | unsigned int flags; | |
a686cd89 | 26 | unsigned short rsv_window_size; |
42a74f20 | 27 | int ret; |
1da177e4 LT |
28 | |
29 | ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); | |
30 | ||
31 | switch (cmd) { | |
32 | case EXT2_IOC_GETFLAGS: | |
4f99ed67 | 33 | ext2_get_inode_flags(ei); |
1da177e4 LT |
34 | flags = ei->i_flags & EXT2_FL_USER_VISIBLE; |
35 | return put_user(flags, (int __user *) arg); | |
36 | case EXT2_IOC_SETFLAGS: { | |
37 | unsigned int oldflags; | |
38 | ||
42a74f20 DH |
39 | ret = mnt_want_write(filp->f_path.mnt); |
40 | if (ret) | |
41 | return ret; | |
1da177e4 | 42 | |
42a74f20 DH |
43 | if (!is_owner_or_cap(inode)) { |
44 | ret = -EACCES; | |
45 | goto setflags_out; | |
46 | } | |
1da177e4 | 47 | |
42a74f20 DH |
48 | if (get_user(flags, (int __user *) arg)) { |
49 | ret = -EFAULT; | |
50 | goto setflags_out; | |
51 | } | |
1da177e4 LT |
52 | |
53 | if (!S_ISDIR(inode->i_mode)) | |
54 | flags &= ~EXT2_DIRSYNC_FL; | |
55 | ||
93f210dd | 56 | mutex_lock(&inode->i_mutex); |
e47776a0 JK |
57 | /* Is it quota file? Do not allow user to mess with it */ |
58 | if (IS_NOQUOTA(inode)) { | |
59 | mutex_unlock(&inode->i_mutex); | |
42a74f20 DH |
60 | ret = -EPERM; |
61 | goto setflags_out; | |
e47776a0 | 62 | } |
1da177e4 LT |
63 | oldflags = ei->i_flags; |
64 | ||
65 | /* | |
66 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
67 | * the relevant capability. | |
68 | * | |
69 | * This test looks nicer. Thanks to Pauline Middelink | |
70 | */ | |
71 | if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { | |
93f210dd AM |
72 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
73 | mutex_unlock(&inode->i_mutex); | |
42a74f20 DH |
74 | ret = -EPERM; |
75 | goto setflags_out; | |
93f210dd | 76 | } |
1da177e4 LT |
77 | } |
78 | ||
79 | flags = flags & EXT2_FL_USER_MODIFIABLE; | |
80 | flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; | |
81 | ei->i_flags = flags; | |
93f210dd | 82 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
83 | |
84 | ext2_set_inode_flags(inode); | |
85 | inode->i_ctime = CURRENT_TIME_SEC; | |
86 | mark_inode_dirty(inode); | |
42a74f20 DH |
87 | setflags_out: |
88 | mnt_drop_write(filp->f_path.mnt); | |
89 | return ret; | |
1da177e4 LT |
90 | } |
91 | case EXT2_IOC_GETVERSION: | |
92 | return put_user(inode->i_generation, (int __user *) arg); | |
93 | case EXT2_IOC_SETVERSION: | |
3bd858ab | 94 | if (!is_owner_or_cap(inode)) |
1da177e4 | 95 | return -EPERM; |
42a74f20 DH |
96 | ret = mnt_want_write(filp->f_path.mnt); |
97 | if (ret) | |
98 | return ret; | |
99 | if (get_user(inode->i_generation, (int __user *) arg)) { | |
100 | ret = -EFAULT; | |
101 | } else { | |
102 | inode->i_ctime = CURRENT_TIME_SEC; | |
103 | mark_inode_dirty(inode); | |
104 | } | |
105 | mnt_drop_write(filp->f_path.mnt); | |
106 | return ret; | |
a686cd89 MB |
107 | case EXT2_IOC_GETRSVSZ: |
108 | if (test_opt(inode->i_sb, RESERVATION) | |
109 | && S_ISREG(inode->i_mode) | |
110 | && ei->i_block_alloc_info) { | |
111 | rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; | |
112 | return put_user(rsv_window_size, (int __user *)arg); | |
113 | } | |
114 | return -ENOTTY; | |
115 | case EXT2_IOC_SETRSVSZ: { | |
116 | ||
117 | if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) | |
118 | return -ENOTTY; | |
119 | ||
42a74f20 | 120 | if (!is_owner_or_cap(inode)) |
a686cd89 MB |
121 | return -EACCES; |
122 | ||
123 | if (get_user(rsv_window_size, (int __user *)arg)) | |
124 | return -EFAULT; | |
125 | ||
42a74f20 DH |
126 | ret = mnt_want_write(filp->f_path.mnt); |
127 | if (ret) | |
128 | return ret; | |
129 | ||
a686cd89 MB |
130 | if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS) |
131 | rsv_window_size = EXT2_MAX_RESERVE_BLOCKS; | |
132 | ||
133 | /* | |
134 | * need to allocate reservation structure for this inode | |
135 | * before set the window size | |
136 | */ | |
137 | /* | |
138 | * XXX What lock should protect the rsv_goal_size? | |
139 | * Accessed in ext2_get_block only. ext3 uses i_truncate. | |
140 | */ | |
141 | mutex_lock(&ei->truncate_mutex); | |
142 | if (!ei->i_block_alloc_info) | |
143 | ext2_init_block_alloc_info(inode); | |
144 | ||
145 | if (ei->i_block_alloc_info){ | |
146 | struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; | |
147 | rsv->rsv_goal_size = rsv_window_size; | |
148 | } | |
149 | mutex_unlock(&ei->truncate_mutex); | |
42a74f20 | 150 | mnt_drop_write(filp->f_path.mnt); |
a686cd89 MB |
151 | return 0; |
152 | } | |
1da177e4 LT |
153 | default: |
154 | return -ENOTTY; | |
155 | } | |
156 | } | |
e322ff07 DH |
157 | |
158 | #ifdef CONFIG_COMPAT | |
159 | long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
160 | { | |
e322ff07 DH |
161 | /* These are just misnamed, they actually get/put from/to user an int */ |
162 | switch (cmd) { | |
163 | case EXT2_IOC32_GETFLAGS: | |
164 | cmd = EXT2_IOC_GETFLAGS; | |
165 | break; | |
166 | case EXT2_IOC32_SETFLAGS: | |
167 | cmd = EXT2_IOC_SETFLAGS; | |
168 | break; | |
169 | case EXT2_IOC32_GETVERSION: | |
170 | cmd = EXT2_IOC_GETVERSION; | |
171 | break; | |
172 | case EXT2_IOC32_SETVERSION: | |
173 | cmd = EXT2_IOC_SETVERSION; | |
174 | break; | |
175 | default: | |
176 | return -ENOIOCTLCMD; | |
177 | } | |
14f9f7b2 | 178 | return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
e322ff07 DH |
179 | } |
180 | #endif |