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10#include <linux/fs.h>
11#include <linux/jbd.h>
12#include <linux/capability.h>
13#include <linux/ext3_fs.h>
14#include <linux/ext3_jbd.h>
15#include <linux/mount.h>
16#include <linux/time.h>
17#include <linux/compat.h>
18#include <linux/smp_lock.h>
19#include <asm/uaccess.h>
20
21int 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:
32 ext3_get_inode_flags(ei);
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
42 err = mnt_want_write(filp->f_path.mnt);
43 if (err)
44 return err;
45
46 if (!is_owner_or_cap(inode)) {
47 err = -EACCES;
48 goto flags_out;
49 }
50
51 if (get_user(flags, (int __user *) arg)) {
52 err = -EFAULT;
53 goto flags_out;
54 }
55
56 if (!S_ISDIR(inode->i_mode))
57 flags &= ~EXT3_DIRSYNC_FL;
58
59 mutex_lock(&inode->i_mutex);
60
61 if (IS_NOQUOTA(inode)) {
62 mutex_unlock(&inode->i_mutex);
63 err = -EPERM;
64 goto flags_out;
65 }
66 oldflags = ei->i_flags;
67
68
69 jflag = flags & EXT3_JOURNAL_DATA_FL;
70
71
72
73
74
75
76
77 if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
78 if (!capable(CAP_LINUX_IMMUTABLE)) {
79 mutex_unlock(&inode->i_mutex);
80 err = -EPERM;
81 goto flags_out;
82 }
83 }
84
85
86
87
88
89 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
90 if (!capable(CAP_SYS_RESOURCE)) {
91 mutex_unlock(&inode->i_mutex);
92 err = -EPERM;
93 goto flags_out;
94 }
95 }
96
97
98 handle = ext3_journal_start(inode, 1);
99 if (IS_ERR(handle)) {
100 mutex_unlock(&inode->i_mutex);
101 err = PTR_ERR(handle);
102 goto flags_out;
103 }
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);
118flags_err:
119 ext3_journal_stop(handle);
120 if (err) {
121 mutex_unlock(&inode->i_mutex);
122 return err;
123 }
124
125 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
126 err = ext3_change_inode_journal_flag(inode, jflag);
127 mutex_unlock(&inode->i_mutex);
128flags_out:
129 mnt_drop_write(filp->f_path.mnt);
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
142 if (!is_owner_or_cap(inode))
143 return -EPERM;
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 }
151 handle = ext3_journal_start(inode, 1);
152 if (IS_ERR(handle)) {
153 err = PTR_ERR(handle);
154 goto setversion_out;
155 }
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);
163setversion_out:
164 mnt_drop_write(filp->f_path.mnt);
165 return err;
166 }
167#ifdef CONFIG_JBD_DEBUG
168 case EXT3_IOC_WAIT_FOR_READONLY:
169
170
171
172
173
174
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: {
200 int err;
201
202 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
203 return -ENOTTY;
204
205 err = mnt_want_write(filp->f_path.mnt);
206 if (err)
207 return err;
208
209 if (!is_owner_or_cap(inode)) {
210 err = -EACCES;
211 goto setrsvsz_out;
212 }
213
214 if (get_user(rsv_window_size, (int __user *)arg)) {
215 err = -EFAULT;
216 goto setrsvsz_out;
217 }
218
219 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
220 rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
221
222
223
224
225
226 mutex_lock(&ei->truncate_mutex);
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 }
234 mutex_unlock(&ei->truncate_mutex);
235setrsvsz_out:
236 mnt_drop_write(filp->f_path.mnt);
237 return err;
238 }
239 case EXT3_IOC_GROUP_EXTEND: {
240 ext3_fsblk_t n_blocks_count;
241 struct super_block *sb = inode->i_sb;
242 int err;
243
244 if (!capable(CAP_SYS_RESOURCE))
245 return -EPERM;
246
247 err = mnt_want_write(filp->f_path.mnt);
248 if (err)
249 return err;
250
251 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
252 err = -EFAULT;
253 goto group_extend_out;
254 }
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);
259group_extend_out:
260 mnt_drop_write(filp->f_path.mnt);
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
271 err = mnt_want_write(filp->f_path.mnt);
272 if (err)
273 return err;
274
275 if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
276 sizeof(input))) {
277 err = -EFAULT;
278 goto group_add_out;
279 }
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);
285group_add_out:
286 mnt_drop_write(filp->f_path.mnt);
287 return err;
288 }
289
290
291 default:
292 return -ENOTTY;
293 }
294}
295
296#ifdef CONFIG_COMPAT
297long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
298{
299 struct inode *inode = file->f_path.dentry->d_inode;
300 int ret;
301
302
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
347
