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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 <asm/uaccess.h>
19
20long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
21{
22 struct inode *inode = filp->f_dentry->d_inode;
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:
31 ext3_get_inode_flags(ei);
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 (!inode_owner_or_capable(inode))
42 return -EACCES;
43
44 if (get_user(flags, (int __user *) arg))
45 return -EFAULT;
46
47 err = mnt_want_write(filp->f_path.mnt);
48 if (err)
49 return err;
50
51 flags = ext3_mask_flags(inode->i_mode, flags);
52
53 mutex_lock(&inode->i_mutex);
54
55 /* Is it quota file? Do not allow user to mess with it */
56 err = -EPERM;
57 if (IS_NOQUOTA(inode))
58 goto flags_out;
59
60 oldflags = ei->i_flags;
61
62 /* The JOURNAL_DATA flag is modifiable only by root */
63 jflag = flags & EXT3_JOURNAL_DATA_FL;
64
65 /*
66 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
67 * the relevant capability.
68 *
69 * This test looks nicer. Thanks to Pauline Middelink
70 */
71 if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
72 if (!capable(CAP_LINUX_IMMUTABLE))
73 goto flags_out;
74 }
75
76 /*
77 * The JOURNAL_DATA flag can only be changed by
78 * the relevant capability.
79 */
80 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
81 if (!capable(CAP_SYS_RESOURCE))
82 goto flags_out;
83 }
84
85 handle = ext3_journal_start(inode, 1);
86 if (IS_ERR(handle)) {
87 err = PTR_ERR(handle);
88 goto flags_out;
89 }
90 if (IS_SYNC(inode))
91 handle->h_sync = 1;
92 err = ext3_reserve_inode_write(handle, inode, &iloc);
93 if (err)
94 goto flags_err;
95
96 flags = flags & EXT3_FL_USER_MODIFIABLE;
97 flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
98 ei->i_flags = flags;
99
100 ext3_set_inode_flags(inode);
101 inode->i_ctime = CURRENT_TIME_SEC;
102
103 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
104flags_err:
105 ext3_journal_stop(handle);
106 if (err)
107 goto flags_out;
108
109 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
110 err = ext3_change_inode_journal_flag(inode, jflag);
111flags_out:
112 mutex_unlock(&inode->i_mutex);
113 mnt_drop_write(filp->f_path.mnt);
114 return err;
115 }
116 case EXT3_IOC_GETVERSION:
117 case EXT3_IOC_GETVERSION_OLD:
118 return put_user(inode->i_generation, (int __user *) arg);
119 case EXT3_IOC_SETVERSION:
120 case EXT3_IOC_SETVERSION_OLD: {
121 handle_t *handle;
122 struct ext3_iloc iloc;
123 __u32 generation;
124 int err;
125
126 if (!inode_owner_or_capable(inode))
127 return -EPERM;
128
129 err = mnt_want_write(filp->f_path.mnt);
130 if (err)
131 return err;
132 if (get_user(generation, (int __user *) arg)) {
133 err = -EFAULT;
134 goto setversion_out;
135 }
136
137 handle = ext3_journal_start(inode, 1);
138 if (IS_ERR(handle)) {
139 err = PTR_ERR(handle);
140 goto setversion_out;
141 }
142 err = ext3_reserve_inode_write(handle, inode, &iloc);
143 if (err == 0) {
144 inode->i_ctime = CURRENT_TIME_SEC;
145 inode->i_generation = generation;
146 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
147 }
148 ext3_journal_stop(handle);
149setversion_out:
150 mnt_drop_write(filp->f_path.mnt);
151 return err;
152 }
153#ifdef CONFIG_JBD_DEBUG
154 case EXT3_IOC_WAIT_FOR_READONLY:
155 /*
156 * This is racy - by the time we're woken up and running,
157 * the superblock could be released. And the module could
158 * have been unloaded. So sue me.
159 *
160 * Returns 1 if it slept, else zero.
161 */
162 {
163 struct super_block *sb = inode->i_sb;
164 DECLARE_WAITQUEUE(wait, current);
165 int ret = 0;
166
167 set_current_state(TASK_INTERRUPTIBLE);
168 add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
169 if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
170 schedule();
171 ret = 1;
172 }
173 remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
174 return ret;
175 }
176#endif
177 case EXT3_IOC_GETRSVSZ:
178 if (test_opt(inode->i_sb, RESERVATION)
179 && S_ISREG(inode->i_mode)
180 && ei->i_block_alloc_info) {
181 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
182 return put_user(rsv_window_size, (int __user *)arg);
183 }
184 return -ENOTTY;
185 case EXT3_IOC_SETRSVSZ: {
186 int err;
187
188 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
189 return -ENOTTY;
190
191 err = mnt_want_write(filp->f_path.mnt);
192 if (err)
193 return err;
194
195 if (!inode_owner_or_capable(inode)) {
196 err = -EACCES;
197 goto setrsvsz_out;
198 }
199
200 if (get_user(rsv_window_size, (int __user *)arg)) {
201 err = -EFAULT;
202 goto setrsvsz_out;
203 }
204
205 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
206 rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
207
208 /*
209 * need to allocate reservation structure for this inode
210 * before set the window size
211 */
212 mutex_lock(&ei->truncate_mutex);
213 if (!ei->i_block_alloc_info)
214 ext3_init_block_alloc_info(inode);
215
216 if (ei->i_block_alloc_info){
217 struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
218 rsv->rsv_goal_size = rsv_window_size;
219 }
220 mutex_unlock(&ei->truncate_mutex);
221setrsvsz_out:
222 mnt_drop_write(filp->f_path.mnt);
223 return err;
224 }
225 case EXT3_IOC_GROUP_EXTEND: {
226 ext3_fsblk_t n_blocks_count;
227 struct super_block *sb = inode->i_sb;
228 int err, err2;
229
230 if (!capable(CAP_SYS_RESOURCE))
231 return -EPERM;
232
233 err = mnt_want_write(filp->f_path.mnt);
234 if (err)
235 return err;
236
237 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
238 err = -EFAULT;
239 goto group_extend_out;
240 }
241 err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
242 journal_lock_updates(EXT3_SB(sb)->s_journal);
243 err2 = journal_flush(EXT3_SB(sb)->s_journal);
244 journal_unlock_updates(EXT3_SB(sb)->s_journal);
245 if (err == 0)
246 err = err2;
247group_extend_out:
248 mnt_drop_write(filp->f_path.mnt);
249 return err;
250 }
251 case EXT3_IOC_GROUP_ADD: {
252 struct ext3_new_group_data input;
253 struct super_block *sb = inode->i_sb;
254 int err, err2;
255
256 if (!capable(CAP_SYS_RESOURCE))
257 return -EPERM;
258
259 err = mnt_want_write(filp->f_path.mnt);
260 if (err)
261 return err;
262
263 if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
264 sizeof(input))) {
265 err = -EFAULT;
266 goto group_add_out;
267 }
268
269 err = ext3_group_add(sb, &input);
270 journal_lock_updates(EXT3_SB(sb)->s_journal);
271 err2 = journal_flush(EXT3_SB(sb)->s_journal);
272 journal_unlock_updates(EXT3_SB(sb)->s_journal);
273 if (err == 0)
274 err = err2;
275group_add_out:
276 mnt_drop_write(filp->f_path.mnt);
277 return err;
278 }
279 case FITRIM: {
280
281 struct super_block *sb = inode->i_sb;
282 struct fstrim_range range;
283 int ret = 0;
284
285 if (!capable(CAP_SYS_ADMIN))
286 return -EPERM;
287
288 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
289 sizeof(range)))
290 return -EFAULT;
291
292 ret = ext3_trim_fs(sb, &range);
293 if (ret < 0)
294 return ret;
295
296 if (copy_to_user((struct fstrim_range __user *)arg, &range,
297 sizeof(range)))
298 return -EFAULT;
299
300 return 0;
301 }
302
303 default:
304 return -ENOTTY;
305 }
306}
307
308#ifdef CONFIG_COMPAT
309long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
310{
311 /* These are just misnamed, they actually get/put from/to user an int */
312 switch (cmd) {
313 case EXT3_IOC32_GETFLAGS:
314 cmd = EXT3_IOC_GETFLAGS;
315 break;
316 case EXT3_IOC32_SETFLAGS:
317 cmd = EXT3_IOC_SETFLAGS;
318 break;
319 case EXT3_IOC32_GETVERSION:
320 cmd = EXT3_IOC_GETVERSION;
321 break;
322 case EXT3_IOC32_SETVERSION:
323 cmd = EXT3_IOC_SETVERSION;
324 break;
325 case EXT3_IOC32_GROUP_EXTEND:
326 cmd = EXT3_IOC_GROUP_EXTEND;
327 break;
328 case EXT3_IOC32_GETVERSION_OLD:
329 cmd = EXT3_IOC_GETVERSION_OLD;
330 break;
331 case EXT3_IOC32_SETVERSION_OLD:
332 cmd = EXT3_IOC_SETVERSION_OLD;
333 break;
334#ifdef CONFIG_JBD_DEBUG
335 case EXT3_IOC32_WAIT_FOR_READONLY:
336 cmd = EXT3_IOC_WAIT_FOR_READONLY;
337 break;
338#endif
339 case EXT3_IOC32_GETRSVSZ:
340 cmd = EXT3_IOC_GETRSVSZ;
341 break;
342 case EXT3_IOC32_SETRSVSZ:
343 cmd = EXT3_IOC_SETRSVSZ;
344 break;
345 case EXT3_IOC_GROUP_ADD:
346 break;
347 default:
348 return -ENOIOCTLCMD;
349 }
350 return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
351}
352#endif