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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> | |
42a74f20 | 15 | #include <linux/mount.h> |
1da177e4 | 16 | #include <linux/time.h> |
52a700c5 DH |
17 | #include <linux/compat.h> |
18 | #include <linux/smp_lock.h> | |
1da177e4 LT |
19 | #include <asm/uaccess.h> |
20 | ||
1da177e4 LT |
21 | int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, |
22 | unsigned long arg) | |
23 | { | |
24 | struct ext3_inode_info *ei = EXT3_I(inode); | |
25 | unsigned int flags; | |
26 | unsigned short rsv_window_size; | |
27 | ||
28 | ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg); | |
29 | ||
30 | switch (cmd) { | |
31 | case EXT3_IOC_GETFLAGS: | |
28be5abb | 32 | ext3_get_inode_flags(ei); |
1da177e4 LT |
33 | flags = ei->i_flags & EXT3_FL_USER_VISIBLE; |
34 | return put_user(flags, (int __user *) arg); | |
35 | case EXT3_IOC_SETFLAGS: { | |
36 | handle_t *handle = NULL; | |
37 | int err; | |
38 | struct ext3_iloc iloc; | |
39 | unsigned int oldflags; | |
40 | unsigned int jflag; | |
41 | ||
42a74f20 DH |
42 | err = mnt_want_write(filp->f_path.mnt); |
43 | if (err) | |
44 | return err; | |
1da177e4 | 45 | |
42a74f20 DH |
46 | if (!is_owner_or_cap(inode)) { |
47 | err = -EACCES; | |
48 | goto flags_out; | |
49 | } | |
1da177e4 | 50 | |
42a74f20 DH |
51 | if (get_user(flags, (int __user *) arg)) { |
52 | err = -EFAULT; | |
53 | goto flags_out; | |
54 | } | |
1da177e4 LT |
55 | |
56 | if (!S_ISDIR(inode->i_mode)) | |
57 | flags &= ~EXT3_DIRSYNC_FL; | |
58 | ||
a090d913 | 59 | mutex_lock(&inode->i_mutex); |
e47776a0 JK |
60 | /* Is it quota file? Do not allow user to mess with it */ |
61 | if (IS_NOQUOTA(inode)) { | |
62 | mutex_unlock(&inode->i_mutex); | |
42a74f20 DH |
63 | err = -EPERM; |
64 | goto flags_out; | |
e47776a0 | 65 | } |
1da177e4 LT |
66 | oldflags = ei->i_flags; |
67 | ||
68 | /* The JOURNAL_DATA flag is modifiable only by root */ | |
69 | jflag = flags & EXT3_JOURNAL_DATA_FL; | |
70 | ||
71 | /* | |
72 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
73 | * the relevant capability. | |
74 | * | |
75 | * This test looks nicer. Thanks to Pauline Middelink | |
76 | */ | |
77 | if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) { | |
a090d913 AV |
78 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
79 | mutex_unlock(&inode->i_mutex); | |
42a74f20 DH |
80 | err = -EPERM; |
81 | goto flags_out; | |
a090d913 | 82 | } |
1da177e4 LT |
83 | } |
84 | ||
85 | /* | |
86 | * The JOURNAL_DATA flag can only be changed by | |
87 | * the relevant capability. | |
88 | */ | |
89 | if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) { | |
a090d913 AV |
90 | if (!capable(CAP_SYS_RESOURCE)) { |
91 | mutex_unlock(&inode->i_mutex); | |
42a74f20 DH |
92 | err = -EPERM; |
93 | goto flags_out; | |
a090d913 | 94 | } |
1da177e4 LT |
95 | } |
96 | ||
97 | ||
98 | handle = ext3_journal_start(inode, 1); | |
a090d913 AV |
99 | if (IS_ERR(handle)) { |
100 | mutex_unlock(&inode->i_mutex); | |
42a74f20 DH |
101 | err = PTR_ERR(handle); |
102 | goto flags_out; | |
a090d913 | 103 | } |
1da177e4 LT |
104 | if (IS_SYNC(inode)) |
105 | handle->h_sync = 1; | |
106 | err = ext3_reserve_inode_write(handle, inode, &iloc); | |
107 | if (err) | |
108 | goto flags_err; | |
109 | ||
110 | flags = flags & EXT3_FL_USER_MODIFIABLE; | |
111 | flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE; | |
112 | ei->i_flags = flags; | |
113 | ||
114 | ext3_set_inode_flags(inode); | |
115 | inode->i_ctime = CURRENT_TIME_SEC; | |
116 | ||
117 | err = ext3_mark_iloc_dirty(handle, inode, &iloc); | |
118 | flags_err: | |
119 | ext3_journal_stop(handle); | |
a090d913 AV |
120 | if (err) { |
121 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 122 | return err; |
a090d913 | 123 | } |
1da177e4 LT |
124 | |
125 | if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) | |
126 | err = ext3_change_inode_journal_flag(inode, jflag); | |
a090d913 | 127 | mutex_unlock(&inode->i_mutex); |
42a74f20 DH |
128 | flags_out: |
129 | mnt_drop_write(filp->f_path.mnt); | |
1da177e4 LT |
130 | return err; |
131 | } | |
132 | case EXT3_IOC_GETVERSION: | |
133 | case EXT3_IOC_GETVERSION_OLD: | |
134 | return put_user(inode->i_generation, (int __user *) arg); | |
135 | case EXT3_IOC_SETVERSION: | |
136 | case EXT3_IOC_SETVERSION_OLD: { | |
137 | handle_t *handle; | |
138 | struct ext3_iloc iloc; | |
139 | __u32 generation; | |
140 | int err; | |
141 | ||
3bd858ab | 142 | if (!is_owner_or_cap(inode)) |
1da177e4 | 143 | return -EPERM; |
42a74f20 DH |
144 | err = mnt_want_write(filp->f_path.mnt); |
145 | if (err) | |
146 | return err; | |
147 | if (get_user(generation, (int __user *) arg)) { | |
148 | err = -EFAULT; | |
149 | goto setversion_out; | |
150 | } | |
1da177e4 | 151 | handle = ext3_journal_start(inode, 1); |
42a74f20 DH |
152 | if (IS_ERR(handle)) { |
153 | err = PTR_ERR(handle); | |
154 | goto setversion_out; | |
155 | } | |
1da177e4 LT |
156 | err = ext3_reserve_inode_write(handle, inode, &iloc); |
157 | if (err == 0) { | |
158 | inode->i_ctime = CURRENT_TIME_SEC; | |
159 | inode->i_generation = generation; | |
160 | err = ext3_mark_iloc_dirty(handle, inode, &iloc); | |
161 | } | |
162 | ext3_journal_stop(handle); | |
42a74f20 DH |
163 | setversion_out: |
164 | mnt_drop_write(filp->f_path.mnt); | |
1da177e4 LT |
165 | return err; |
166 | } | |
167 | #ifdef CONFIG_JBD_DEBUG | |
168 | case EXT3_IOC_WAIT_FOR_READONLY: | |
169 | /* | |
170 | * This is racy - by the time we're woken up and running, | |
171 | * the superblock could be released. And the module could | |
172 | * have been unloaded. So sue me. | |
173 | * | |
174 | * Returns 1 if it slept, else zero. | |
175 | */ | |
176 | { | |
177 | struct super_block *sb = inode->i_sb; | |
178 | DECLARE_WAITQUEUE(wait, current); | |
179 | int ret = 0; | |
180 | ||
181 | set_current_state(TASK_INTERRUPTIBLE); | |
182 | add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait); | |
183 | if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) { | |
184 | schedule(); | |
185 | ret = 1; | |
186 | } | |
187 | remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait); | |
188 | return ret; | |
189 | } | |
190 | #endif | |
191 | case EXT3_IOC_GETRSVSZ: | |
192 | if (test_opt(inode->i_sb, RESERVATION) | |
193 | && S_ISREG(inode->i_mode) | |
194 | && ei->i_block_alloc_info) { | |
195 | rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; | |
196 | return put_user(rsv_window_size, (int __user *)arg); | |
197 | } | |
198 | return -ENOTTY; | |
199 | case EXT3_IOC_SETRSVSZ: { | |
42a74f20 | 200 | int err; |
1da177e4 LT |
201 | |
202 | if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) | |
203 | return -ENOTTY; | |
204 | ||
42a74f20 DH |
205 | err = mnt_want_write(filp->f_path.mnt); |
206 | if (err) | |
207 | return err; | |
1da177e4 | 208 | |
42a74f20 DH |
209 | if (!is_owner_or_cap(inode)) { |
210 | err = -EACCES; | |
211 | goto setrsvsz_out; | |
212 | } | |
1da177e4 | 213 | |
42a74f20 DH |
214 | if (get_user(rsv_window_size, (int __user *)arg)) { |
215 | err = -EFAULT; | |
216 | goto setrsvsz_out; | |
217 | } | |
1da177e4 LT |
218 | |
219 | if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS) | |
220 | rsv_window_size = EXT3_MAX_RESERVE_BLOCKS; | |
221 | ||
222 | /* | |
223 | * need to allocate reservation structure for this inode | |
224 | * before set the window size | |
225 | */ | |
97461518 | 226 | mutex_lock(&ei->truncate_mutex); |
1da177e4 LT |
227 | if (!ei->i_block_alloc_info) |
228 | ext3_init_block_alloc_info(inode); | |
229 | ||
230 | if (ei->i_block_alloc_info){ | |
231 | struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; | |
232 | rsv->rsv_goal_size = rsv_window_size; | |
233 | } | |
97461518 | 234 | mutex_unlock(&ei->truncate_mutex); |
42a74f20 DH |
235 | setrsvsz_out: |
236 | mnt_drop_write(filp->f_path.mnt); | |
237 | return err; | |
1da177e4 LT |
238 | } |
239 | case EXT3_IOC_GROUP_EXTEND: { | |
43d23f90 | 240 | ext3_fsblk_t n_blocks_count; |
1da177e4 LT |
241 | struct super_block *sb = inode->i_sb; |
242 | int err; | |
243 | ||
244 | if (!capable(CAP_SYS_RESOURCE)) | |
245 | return -EPERM; | |
246 | ||
42a74f20 DH |
247 | err = mnt_want_write(filp->f_path.mnt); |
248 | if (err) | |
249 | return err; | |
1da177e4 | 250 | |
42a74f20 DH |
251 | if (get_user(n_blocks_count, (__u32 __user *)arg)) { |
252 | err = -EFAULT; | |
253 | goto group_extend_out; | |
254 | } | |
1da177e4 LT |
255 | err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count); |
256 | journal_lock_updates(EXT3_SB(sb)->s_journal); | |
257 | journal_flush(EXT3_SB(sb)->s_journal); | |
258 | journal_unlock_updates(EXT3_SB(sb)->s_journal); | |
42a74f20 DH |
259 | group_extend_out: |
260 | mnt_drop_write(filp->f_path.mnt); | |
1da177e4 LT |
261 | return err; |
262 | } | |
263 | case EXT3_IOC_GROUP_ADD: { | |
264 | struct ext3_new_group_data input; | |
265 | struct super_block *sb = inode->i_sb; | |
266 | int err; | |
267 | ||
268 | if (!capable(CAP_SYS_RESOURCE)) | |
269 | return -EPERM; | |
270 | ||
42a74f20 DH |
271 | err = mnt_want_write(filp->f_path.mnt); |
272 | if (err) | |
273 | return err; | |
1da177e4 LT |
274 | |
275 | if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg, | |
42a74f20 DH |
276 | sizeof(input))) { |
277 | err = -EFAULT; | |
278 | goto group_add_out; | |
279 | } | |
1da177e4 LT |
280 | |
281 | err = ext3_group_add(sb, &input); | |
282 | journal_lock_updates(EXT3_SB(sb)->s_journal); | |
283 | journal_flush(EXT3_SB(sb)->s_journal); | |
284 | journal_unlock_updates(EXT3_SB(sb)->s_journal); | |
42a74f20 DH |
285 | group_add_out: |
286 | mnt_drop_write(filp->f_path.mnt); | |
1da177e4 LT |
287 | return err; |
288 | } | |
289 | ||
290 | ||
291 | default: | |
292 | return -ENOTTY; | |
293 | } | |
294 | } | |
52a700c5 DH |
295 | |
296 | #ifdef CONFIG_COMPAT | |
297 | long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
298 | { | |
fe21a693 | 299 | struct inode *inode = file->f_path.dentry->d_inode; |
52a700c5 DH |
300 | int ret; |
301 | ||
302 | /* These are just misnamed, they actually get/put from/to user an int */ | |
303 | switch (cmd) { | |
304 | case EXT3_IOC32_GETFLAGS: | |
305 | cmd = EXT3_IOC_GETFLAGS; | |
306 | break; | |
307 | case EXT3_IOC32_SETFLAGS: | |
308 | cmd = EXT3_IOC_SETFLAGS; | |
309 | break; | |
310 | case EXT3_IOC32_GETVERSION: | |
311 | cmd = EXT3_IOC_GETVERSION; | |
312 | break; | |
313 | case EXT3_IOC32_SETVERSION: | |
314 | cmd = EXT3_IOC_SETVERSION; | |
315 | break; | |
316 | case EXT3_IOC32_GROUP_EXTEND: | |
317 | cmd = EXT3_IOC_GROUP_EXTEND; | |
318 | break; | |
319 | case EXT3_IOC32_GETVERSION_OLD: | |
320 | cmd = EXT3_IOC_GETVERSION_OLD; | |
321 | break; | |
322 | case EXT3_IOC32_SETVERSION_OLD: | |
323 | cmd = EXT3_IOC_SETVERSION_OLD; | |
324 | break; | |
325 | #ifdef CONFIG_JBD_DEBUG | |
326 | case EXT3_IOC32_WAIT_FOR_READONLY: | |
327 | cmd = EXT3_IOC_WAIT_FOR_READONLY; | |
328 | break; | |
329 | #endif | |
330 | case EXT3_IOC32_GETRSVSZ: | |
331 | cmd = EXT3_IOC_GETRSVSZ; | |
332 | break; | |
333 | case EXT3_IOC32_SETRSVSZ: | |
334 | cmd = EXT3_IOC_SETRSVSZ; | |
335 | break; | |
336 | case EXT3_IOC_GROUP_ADD: | |
337 | break; | |
338 | default: | |
339 | return -ENOIOCTLCMD; | |
340 | } | |
341 | lock_kernel(); | |
342 | ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); | |
343 | unlock_kernel(); | |
344 | return ret; | |
345 | } | |
346 | #endif |