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>
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 :
21 : int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
22 : unsigned long arg)
23 39617 : {
24 39617 : 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 39617 : switch (cmd) {
31 : case EXT3_IOC_GETFLAGS:
32 240 : ext3_get_inode_flags(ei);
33 240 : flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
34 240 : return put_user(flags, (int __user *) arg);
35 : case EXT3_IOC_SETFLAGS: {
36 141 : handle_t *handle = NULL;
37 : int err;
38 : struct ext3_iloc iloc;
39 : unsigned int oldflags;
40 : unsigned int jflag;
41 :
42 141 : err = mnt_want_write(filp->f_path.mnt);
43 141 : if (err)
44 0 : return err;
45 :
46 141 : if (!is_owner_or_cap(inode)) {
47 0 : err = -EACCES;
48 0 : goto flags_out;
49 : }
50 :
51 141 : if (get_user(flags, (int __user *) arg)) {
52 0 : err = -EFAULT;
53 0 : goto flags_out;
54 : }
55 :
56 141 : if (!S_ISDIR(inode->i_mode))
57 141 : flags &= ~EXT3_DIRSYNC_FL;
58 :
59 141 : mutex_lock(&inode->i_mutex);
60 : /* Is it quota file? Do not allow user to mess with it */
61 141 : if (IS_NOQUOTA(inode)) {
62 0 : mutex_unlock(&inode->i_mutex);
63 0 : err = -EPERM;
64 0 : goto flags_out;
65 : }
66 141 : oldflags = ei->i_flags;
67 :
68 : /* The JOURNAL_DATA flag is modifiable only by root */
69 141 : 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 : */
77 141 : if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
78 84 : if (!capable(CAP_LINUX_IMMUTABLE)) {
79 0 : mutex_unlock(&inode->i_mutex);
80 0 : err = -EPERM;
81 0 : goto flags_out;
82 : }
83 : }
84 :
85 : /*
86 : * The JOURNAL_DATA flag can only be changed by
87 : * the relevant capability.
88 : */
89 141 : if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
90 0 : if (!capable(CAP_SYS_RESOURCE)) {
91 0 : mutex_unlock(&inode->i_mutex);
92 0 : err = -EPERM;
93 0 : goto flags_out;
94 : }
95 : }
96 :
97 :
98 141 : handle = ext3_journal_start(inode, 1);
99 141 : if (IS_ERR(handle)) {
100 0 : mutex_unlock(&inode->i_mutex);
101 0 : err = PTR_ERR(handle);
102 0 : goto flags_out;
103 : }
104 141 : if (IS_SYNC(inode))
105 0 : handle->h_sync = 1;
106 141 : err = ext3_reserve_inode_write(handle, inode, &iloc);
107 141 : if (err)
108 0 : goto flags_err;
109 :
110 141 : flags = flags & EXT3_FL_USER_MODIFIABLE;
111 141 : flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
112 141 : ei->i_flags = flags;
113 :
114 141 : ext3_set_inode_flags(inode);
115 141 : inode->i_ctime = CURRENT_TIME_SEC;
116 :
117 141 : err = ext3_mark_iloc_dirty(handle, inode, &iloc);
118 141 : flags_err:
119 141 : ext3_journal_stop(handle);
120 141 : if (err) {
121 0 : mutex_unlock(&inode->i_mutex);
122 0 : return err;
123 : }
124 :
125 141 : if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
126 0 : err = ext3_change_inode_journal_flag(inode, jflag);
127 141 : mutex_unlock(&inode->i_mutex);
128 141 : flags_out:
129 141 : mnt_drop_write(filp->f_path.mnt);
130 141 : return err;
131 : }
132 : case EXT3_IOC_GETVERSION:
133 : case EXT3_IOC_GETVERSION_OLD:
134 0 : 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 0 : if (!is_owner_or_cap(inode))
143 0 : return -EPERM;
144 0 : err = mnt_want_write(filp->f_path.mnt);
145 0 : if (err)
146 0 : return err;
147 0 : if (get_user(generation, (int __user *) arg)) {
148 0 : err = -EFAULT;
149 0 : goto setversion_out;
150 : }
151 0 : handle = ext3_journal_start(inode, 1);
152 0 : if (IS_ERR(handle)) {
153 0 : err = PTR_ERR(handle);
154 0 : goto setversion_out;
155 : }
156 0 : err = ext3_reserve_inode_write(handle, inode, &iloc);
157 0 : if (err == 0) {
158 0 : inode->i_ctime = CURRENT_TIME_SEC;
159 0 : inode->i_generation = generation;
160 0 : err = ext3_mark_iloc_dirty(handle, inode, &iloc);
161 : }
162 0 : ext3_journal_stop(handle);
163 0 : setversion_out:
164 0 : mnt_drop_write(filp->f_path.mnt);
165 0 : 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 0 : if (test_opt(inode->i_sb, RESERVATION)
193 : && S_ISREG(inode->i_mode)
194 : && ei->i_block_alloc_info) {
195 0 : rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
196 0 : return put_user(rsv_window_size, (int __user *)arg);
197 : }
198 0 : return -ENOTTY;
199 : case EXT3_IOC_SETRSVSZ: {
200 : int err;
201 :
202 0 : if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
203 0 : return -ENOTTY;
204 :
205 0 : err = mnt_want_write(filp->f_path.mnt);
206 0 : if (err)
207 0 : return err;
208 :
209 0 : if (!is_owner_or_cap(inode)) {
210 0 : err = -EACCES;
211 0 : goto setrsvsz_out;
212 : }
213 :
214 0 : if (get_user(rsv_window_size, (int __user *)arg)) {
215 0 : err = -EFAULT;
216 0 : goto setrsvsz_out;
217 : }
218 :
219 0 : if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
220 0 : 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 : */
226 0 : mutex_lock(&ei->truncate_mutex);
227 0 : if (!ei->i_block_alloc_info)
228 0 : ext3_init_block_alloc_info(inode);
229 :
230 0 : if (ei->i_block_alloc_info){
231 0 : struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
232 0 : rsv->rsv_goal_size = rsv_window_size;
233 : }
234 0 : mutex_unlock(&ei->truncate_mutex);
235 0 : setrsvsz_out:
236 0 : mnt_drop_write(filp->f_path.mnt);
237 0 : return err;
238 : }
239 : case EXT3_IOC_GROUP_EXTEND: {
240 : ext3_fsblk_t n_blocks_count;
241 0 : struct super_block *sb = inode->i_sb;
242 : int err;
243 :
244 0 : if (!capable(CAP_SYS_RESOURCE))
245 0 : return -EPERM;
246 :
247 0 : err = mnt_want_write(filp->f_path.mnt);
248 0 : if (err)
249 0 : return err;
250 :
251 0 : if (get_user(n_blocks_count, (__u32 __user *)arg)) {
252 0 : err = -EFAULT;
253 0 : goto group_extend_out;
254 : }
255 0 : err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
256 0 : journal_lock_updates(EXT3_SB(sb)->s_journal);
257 0 : journal_flush(EXT3_SB(sb)->s_journal);
258 0 : journal_unlock_updates(EXT3_SB(sb)->s_journal);
259 0 : group_extend_out:
260 0 : mnt_drop_write(filp->f_path.mnt);
261 0 : return err;
262 : }
263 : case EXT3_IOC_GROUP_ADD: {
264 : struct ext3_new_group_data input;
265 0 : struct super_block *sb = inode->i_sb;
266 : int err;
267 :
268 0 : if (!capable(CAP_SYS_RESOURCE))
269 0 : return -EPERM;
270 :
271 0 : err = mnt_want_write(filp->f_path.mnt);
272 0 : if (err)
273 0 : return err;
274 :
275 0 : if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
276 : sizeof(input))) {
277 0 : err = -EFAULT;
278 0 : goto group_add_out;
279 : }
280 :
281 0 : err = ext3_group_add(sb, &input);
282 0 : journal_lock_updates(EXT3_SB(sb)->s_journal);
283 0 : journal_flush(EXT3_SB(sb)->s_journal);
284 0 : journal_unlock_updates(EXT3_SB(sb)->s_journal);
285 0 : group_add_out:
286 0 : mnt_drop_write(filp->f_path.mnt);
287 0 : return err;
288 : }
289 :
290 :
291 : default:
292 39236 : return -ENOTTY;
293 : }
294 : }
295 :
296 : #ifdef CONFIG_COMPAT
297 : long 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 : /* 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
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