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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> |
1da177e4 LT |
16 | #include <asm/current.h> |
17 | #include <asm/uaccess.h> | |
18 | ||
19 | ||
14f9f7b2 | 20 | long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 21 | { |
14f9f7b2 | 22 | struct inode *inode = filp->f_dentry->d_inode; |
1da177e4 LT |
23 | struct ext2_inode_info *ei = EXT2_I(inode); |
24 | unsigned int flags; | |
a686cd89 | 25 | unsigned short rsv_window_size; |
42a74f20 | 26 | int ret; |
1da177e4 LT |
27 | |
28 | ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); | |
29 | ||
30 | switch (cmd) { | |
31 | case EXT2_IOC_GETFLAGS: | |
4f99ed67 | 32 | ext2_get_inode_flags(ei); |
1da177e4 LT |
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 | ||
42a74f20 DH |
38 | ret = mnt_want_write(filp->f_path.mnt); |
39 | if (ret) | |
40 | return ret; | |
1da177e4 | 41 | |
42a74f20 DH |
42 | if (!is_owner_or_cap(inode)) { |
43 | ret = -EACCES; | |
44 | goto setflags_out; | |
45 | } | |
1da177e4 | 46 | |
42a74f20 DH |
47 | if (get_user(flags, (int __user *) arg)) { |
48 | ret = -EFAULT; | |
49 | goto setflags_out; | |
50 | } | |
1da177e4 | 51 | |
ef8b6461 | 52 | flags = ext2_mask_flags(inode->i_mode, flags); |
1da177e4 | 53 | |
93f210dd | 54 | mutex_lock(&inode->i_mutex); |
e47776a0 JK |
55 | /* Is it quota file? Do not allow user to mess with it */ |
56 | if (IS_NOQUOTA(inode)) { | |
57 | mutex_unlock(&inode->i_mutex); | |
42a74f20 DH |
58 | ret = -EPERM; |
59 | goto setflags_out; | |
e47776a0 | 60 | } |
1da177e4 LT |
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)) { | |
93f210dd AM |
70 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
71 | mutex_unlock(&inode->i_mutex); | |
42a74f20 DH |
72 | ret = -EPERM; |
73 | goto setflags_out; | |
93f210dd | 74 | } |
1da177e4 LT |
75 | } |
76 | ||
77 | flags = flags & EXT2_FL_USER_MODIFIABLE; | |
78 | flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; | |
79 | ei->i_flags = flags; | |
93f210dd | 80 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
81 | |
82 | ext2_set_inode_flags(inode); | |
83 | inode->i_ctime = CURRENT_TIME_SEC; | |
84 | mark_inode_dirty(inode); | |
42a74f20 DH |
85 | setflags_out: |
86 | mnt_drop_write(filp->f_path.mnt); | |
87 | return ret; | |
1da177e4 LT |
88 | } |
89 | case EXT2_IOC_GETVERSION: | |
90 | return put_user(inode->i_generation, (int __user *) arg); | |
91 | case EXT2_IOC_SETVERSION: | |
3bd858ab | 92 | if (!is_owner_or_cap(inode)) |
1da177e4 | 93 | return -EPERM; |
42a74f20 DH |
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; | |
a686cd89 MB |
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 | ||
42a74f20 | 118 | if (!is_owner_or_cap(inode)) |
a686cd89 MB |
119 | return -EACCES; |
120 | ||
121 | if (get_user(rsv_window_size, (int __user *)arg)) | |
122 | return -EFAULT; | |
123 | ||
42a74f20 DH |
124 | ret = mnt_want_write(filp->f_path.mnt); |
125 | if (ret) | |
126 | return ret; | |
127 | ||
a686cd89 MB |
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); | |
42a74f20 | 148 | mnt_drop_write(filp->f_path.mnt); |
a686cd89 MB |
149 | return 0; |
150 | } | |
1da177e4 LT |
151 | default: |
152 | return -ENOTTY; | |
153 | } | |
154 | } | |
e322ff07 DH |
155 | |
156 | #ifdef CONFIG_COMPAT | |
157 | long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
158 | { | |
e322ff07 DH |
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 | } | |
14f9f7b2 | 176 | return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
e322ff07 DH |
177 | } |
178 | #endif |