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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/ext3/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 <linux/fs.h> | |
11 | #include <linux/jbd.h> | |
16f7e0fe | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/ext3_fs.h> |
14 | #include <linux/ext3_jbd.h> | |
15 | #include <linux/time.h> | |
52a700c5 DH |
16 | #include <linux/compat.h> |
17 | #include <linux/smp_lock.h> | |
1da177e4 LT |
18 | #include <asm/uaccess.h> |
19 | ||
1da177e4 LT |
20 | int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, |
21 | unsigned long arg) | |
22 | { | |
23 | struct ext3_inode_info *ei = EXT3_I(inode); | |
24 | unsigned int flags; | |
25 | unsigned short rsv_window_size; | |
26 | ||
27 | ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg); | |
28 | ||
29 | switch (cmd) { | |
30 | case EXT3_IOC_GETFLAGS: | |
28be5abb | 31 | ext3_get_inode_flags(ei); |
1da177e4 LT |
32 | flags = ei->i_flags & EXT3_FL_USER_VISIBLE; |
33 | return put_user(flags, (int __user *) arg); | |
34 | case EXT3_IOC_SETFLAGS: { | |
35 | handle_t *handle = NULL; | |
36 | int err; | |
37 | struct ext3_iloc iloc; | |
38 | unsigned int oldflags; | |
39 | unsigned int jflag; | |
40 | ||
41 | if (IS_RDONLY(inode)) | |
42 | return -EROFS; | |
43 | ||
3bd858ab | 44 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
45 | return -EACCES; |
46 | ||
47 | if (get_user(flags, (int __user *) arg)) | |
48 | return -EFAULT; | |
49 | ||
50 | if (!S_ISDIR(inode->i_mode)) | |
51 | flags &= ~EXT3_DIRSYNC_FL; | |
52 | ||
a090d913 | 53 | mutex_lock(&inode->i_mutex); |
e47776a0 JK |
54 | /* Is it quota file? Do not allow user to mess with it */ |
55 | if (IS_NOQUOTA(inode)) { | |
56 | mutex_unlock(&inode->i_mutex); | |
57 | return -EPERM; | |
58 | } | |
1da177e4 LT |
59 | oldflags = ei->i_flags; |
60 | ||
61 | /* The JOURNAL_DATA flag is modifiable only by root */ | |
62 | jflag = flags & EXT3_JOURNAL_DATA_FL; | |
63 | ||
64 | /* | |
65 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
66 | * the relevant capability. | |
67 | * | |
68 | * This test looks nicer. Thanks to Pauline Middelink | |
69 | */ | |
70 | if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) { | |
a090d913 AV |
71 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
72 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 73 | return -EPERM; |
a090d913 | 74 | } |
1da177e4 LT |
75 | } |
76 | ||
77 | /* | |
78 | * The JOURNAL_DATA flag can only be changed by | |
79 | * the relevant capability. | |
80 | */ | |
81 | if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) { | |
a090d913 AV |
82 | if (!capable(CAP_SYS_RESOURCE)) { |
83 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 84 | return -EPERM; |
a090d913 | 85 | } |
1da177e4 LT |
86 | } |
87 | ||
88 | ||
89 | handle = ext3_journal_start(inode, 1); | |
a090d913 AV |
90 | if (IS_ERR(handle)) { |
91 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 92 | return PTR_ERR(handle); |
a090d913 | 93 | } |
1da177e4 LT |
94 | if (IS_SYNC(inode)) |
95 | handle->h_sync = 1; | |
96 | err = ext3_reserve_inode_write(handle, inode, &iloc); | |
97 | if (err) | |
98 | goto flags_err; | |
99 | ||
100 | flags = flags & EXT3_FL_USER_MODIFIABLE; | |
101 | flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE; | |
102 | ei->i_flags = flags; | |
103 | ||
104 | ext3_set_inode_flags(inode); | |
105 | inode->i_ctime = CURRENT_TIME_SEC; | |
106 | ||
107 | err = ext3_mark_iloc_dirty(handle, inode, &iloc); | |
108 | flags_err: | |
109 | ext3_journal_stop(handle); | |
a090d913 AV |
110 | if (err) { |
111 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 112 | return err; |
a090d913 | 113 | } |
1da177e4 LT |
114 | |
115 | if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) | |
116 | err = ext3_change_inode_journal_flag(inode, jflag); | |
a090d913 | 117 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
118 | return err; |
119 | } | |
120 | case EXT3_IOC_GETVERSION: | |
121 | case EXT3_IOC_GETVERSION_OLD: | |
122 | return put_user(inode->i_generation, (int __user *) arg); | |
123 | case EXT3_IOC_SETVERSION: | |
124 | case EXT3_IOC_SETVERSION_OLD: { | |
125 | handle_t *handle; | |
126 | struct ext3_iloc iloc; | |
127 | __u32 generation; | |
128 | int err; | |
129 | ||
3bd858ab | 130 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
131 | return -EPERM; |
132 | if (IS_RDONLY(inode)) | |
133 | return -EROFS; | |
134 | if (get_user(generation, (int __user *) arg)) | |
135 | return -EFAULT; | |
136 | ||
137 | handle = ext3_journal_start(inode, 1); | |
138 | if (IS_ERR(handle)) | |
139 | return PTR_ERR(handle); | |
140 | err = ext3_reserve_inode_write(handle, inode, &iloc); | |
141 | if (err == 0) { | |
142 | inode->i_ctime = CURRENT_TIME_SEC; | |
143 | inode->i_generation = generation; | |
144 | err = ext3_mark_iloc_dirty(handle, inode, &iloc); | |
145 | } | |
146 | ext3_journal_stop(handle); | |
147 | return err; | |
148 | } | |
149 | #ifdef CONFIG_JBD_DEBUG | |
150 | case EXT3_IOC_WAIT_FOR_READONLY: | |
151 | /* | |
152 | * This is racy - by the time we're woken up and running, | |
153 | * the superblock could be released. And the module could | |
154 | * have been unloaded. So sue me. | |
155 | * | |
156 | * Returns 1 if it slept, else zero. | |
157 | */ | |
158 | { | |
159 | struct super_block *sb = inode->i_sb; | |
160 | DECLARE_WAITQUEUE(wait, current); | |
161 | int ret = 0; | |
162 | ||
163 | set_current_state(TASK_INTERRUPTIBLE); | |
164 | add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait); | |
165 | if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) { | |
166 | schedule(); | |
167 | ret = 1; | |
168 | } | |
169 | remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait); | |
170 | return ret; | |
171 | } | |
172 | #endif | |
173 | case EXT3_IOC_GETRSVSZ: | |
174 | if (test_opt(inode->i_sb, RESERVATION) | |
175 | && S_ISREG(inode->i_mode) | |
176 | && ei->i_block_alloc_info) { | |
177 | rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; | |
178 | return put_user(rsv_window_size, (int __user *)arg); | |
179 | } | |
180 | return -ENOTTY; | |
181 | case EXT3_IOC_SETRSVSZ: { | |
182 | ||
183 | if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) | |
184 | return -ENOTTY; | |
185 | ||
186 | if (IS_RDONLY(inode)) | |
187 | return -EROFS; | |
188 | ||
3bd858ab | 189 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
190 | return -EACCES; |
191 | ||
192 | if (get_user(rsv_window_size, (int __user *)arg)) | |
193 | return -EFAULT; | |
194 | ||
195 | if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS) | |
196 | rsv_window_size = EXT3_MAX_RESERVE_BLOCKS; | |
197 | ||
198 | /* | |
199 | * need to allocate reservation structure for this inode | |
200 | * before set the window size | |
201 | */ | |
97461518 | 202 | mutex_lock(&ei->truncate_mutex); |
1da177e4 LT |
203 | if (!ei->i_block_alloc_info) |
204 | ext3_init_block_alloc_info(inode); | |
205 | ||
206 | if (ei->i_block_alloc_info){ | |
207 | struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; | |
208 | rsv->rsv_goal_size = rsv_window_size; | |
209 | } | |
97461518 | 210 | mutex_unlock(&ei->truncate_mutex); |
1da177e4 LT |
211 | return 0; |
212 | } | |
213 | case EXT3_IOC_GROUP_EXTEND: { | |
43d23f90 | 214 | ext3_fsblk_t n_blocks_count; |
1da177e4 LT |
215 | struct super_block *sb = inode->i_sb; |
216 | int err; | |
217 | ||
218 | if (!capable(CAP_SYS_RESOURCE)) | |
219 | return -EPERM; | |
220 | ||
221 | if (IS_RDONLY(inode)) | |
222 | return -EROFS; | |
223 | ||
224 | if (get_user(n_blocks_count, (__u32 __user *)arg)) | |
225 | return -EFAULT; | |
226 | ||
227 | err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count); | |
228 | journal_lock_updates(EXT3_SB(sb)->s_journal); | |
229 | journal_flush(EXT3_SB(sb)->s_journal); | |
230 | journal_unlock_updates(EXT3_SB(sb)->s_journal); | |
231 | ||
232 | return err; | |
233 | } | |
234 | case EXT3_IOC_GROUP_ADD: { | |
235 | struct ext3_new_group_data input; | |
236 | struct super_block *sb = inode->i_sb; | |
237 | int err; | |
238 | ||
239 | if (!capable(CAP_SYS_RESOURCE)) | |
240 | return -EPERM; | |
241 | ||
242 | if (IS_RDONLY(inode)) | |
243 | return -EROFS; | |
244 | ||
245 | if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg, | |
246 | sizeof(input))) | |
247 | return -EFAULT; | |
248 | ||
249 | err = ext3_group_add(sb, &input); | |
250 | journal_lock_updates(EXT3_SB(sb)->s_journal); | |
251 | journal_flush(EXT3_SB(sb)->s_journal); | |
252 | journal_unlock_updates(EXT3_SB(sb)->s_journal); | |
253 | ||
254 | return err; | |
255 | } | |
256 | ||
257 | ||
258 | default: | |
259 | return -ENOTTY; | |
260 | } | |
261 | } | |
52a700c5 DH |
262 | |
263 | #ifdef CONFIG_COMPAT | |
264 | long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
265 | { | |
fe21a693 | 266 | struct inode *inode = file->f_path.dentry->d_inode; |
52a700c5 DH |
267 | int ret; |
268 | ||
269 | /* These are just misnamed, they actually get/put from/to user an int */ | |
270 | switch (cmd) { | |
271 | case EXT3_IOC32_GETFLAGS: | |
272 | cmd = EXT3_IOC_GETFLAGS; | |
273 | break; | |
274 | case EXT3_IOC32_SETFLAGS: | |
275 | cmd = EXT3_IOC_SETFLAGS; | |
276 | break; | |
277 | case EXT3_IOC32_GETVERSION: | |
278 | cmd = EXT3_IOC_GETVERSION; | |
279 | break; | |
280 | case EXT3_IOC32_SETVERSION: | |
281 | cmd = EXT3_IOC_SETVERSION; | |
282 | break; | |
283 | case EXT3_IOC32_GROUP_EXTEND: | |
284 | cmd = EXT3_IOC_GROUP_EXTEND; | |
285 | break; | |
286 | case EXT3_IOC32_GETVERSION_OLD: | |
287 | cmd = EXT3_IOC_GETVERSION_OLD; | |
288 | break; | |
289 | case EXT3_IOC32_SETVERSION_OLD: | |
290 | cmd = EXT3_IOC_SETVERSION_OLD; | |
291 | break; | |
292 | #ifdef CONFIG_JBD_DEBUG | |
293 | case EXT3_IOC32_WAIT_FOR_READONLY: | |
294 | cmd = EXT3_IOC_WAIT_FOR_READONLY; | |
295 | break; | |
296 | #endif | |
297 | case EXT3_IOC32_GETRSVSZ: | |
298 | cmd = EXT3_IOC_GETRSVSZ; | |
299 | break; | |
300 | case EXT3_IOC32_SETRSVSZ: | |
301 | cmd = EXT3_IOC_SETRSVSZ; | |
302 | break; | |
303 | case EXT3_IOC_GROUP_ADD: | |
304 | break; | |
305 | default: | |
306 | return -ENOIOCTLCMD; | |
307 | } | |
308 | lock_kernel(); | |
309 | ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); | |
310 | unlock_kernel(); | |
311 | return ret; | |
312 | } | |
313 | #endif |