Merge branch 'devicetree/merge' of git://git.secretlab.ca/git/linux-2.6
[pandora-kernel.git] / fs / ext4 / ioctl.c
1 /*
2  * linux/fs/ext4/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/jbd2.h>
12 #include <linux/capability.h>
13 #include <linux/time.h>
14 #include <linux/compat.h>
15 #include <linux/mount.h>
16 #include <linux/file.h>
17 #include <asm/uaccess.h>
18 #include "ext4_jbd2.h"
19 #include "ext4.h"
20
21 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
22 {
23         struct inode *inode = filp->f_dentry->d_inode;
24         struct super_block *sb = inode->i_sb;
25         struct ext4_inode_info *ei = EXT4_I(inode);
26         unsigned int flags;
27
28         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
29
30         switch (cmd) {
31         case EXT4_IOC_GETFLAGS:
32                 ext4_get_inode_flags(ei);
33                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
34                 return put_user(flags, (int __user *) arg);
35         case EXT4_IOC_SETFLAGS: {
36                 handle_t *handle = NULL;
37                 int err, migrate = 0;
38                 struct ext4_iloc iloc;
39                 unsigned int oldflags;
40                 unsigned int jflag;
41
42                 if (!inode_owner_or_capable(inode))
43                         return -EACCES;
44
45                 if (get_user(flags, (int __user *) arg))
46                         return -EFAULT;
47
48                 err = mnt_want_write(filp->f_path.mnt);
49                 if (err)
50                         return err;
51
52                 flags = ext4_mask_flags(inode->i_mode, flags);
53
54                 err = -EPERM;
55                 mutex_lock(&inode->i_mutex);
56                 /* Is it quota file? Do not allow user to mess with it */
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 & EXT4_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) & (EXT4_APPEND_FL | EXT4_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) & (EXT4_JOURNAL_DATA_FL)) {
81                         if (!capable(CAP_SYS_RESOURCE))
82                                 goto flags_out;
83                 }
84                 if (oldflags & EXT4_EXTENTS_FL) {
85                         /* We don't support clearning extent flags */
86                         if (!(flags & EXT4_EXTENTS_FL)) {
87                                 err = -EOPNOTSUPP;
88                                 goto flags_out;
89                         }
90                 } else if (flags & EXT4_EXTENTS_FL) {
91                         /* migrate the file */
92                         migrate = 1;
93                         flags &= ~EXT4_EXTENTS_FL;
94                 }
95
96                 if (flags & EXT4_EOFBLOCKS_FL) {
97                         /* we don't support adding EOFBLOCKS flag */
98                         if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
99                                 err = -EOPNOTSUPP;
100                                 goto flags_out;
101                         }
102                 } else if (oldflags & EXT4_EOFBLOCKS_FL)
103                         ext4_truncate(inode);
104
105                 handle = ext4_journal_start(inode, 1);
106                 if (IS_ERR(handle)) {
107                         err = PTR_ERR(handle);
108                         goto flags_out;
109                 }
110                 if (IS_SYNC(inode))
111                         ext4_handle_sync(handle);
112                 err = ext4_reserve_inode_write(handle, inode, &iloc);
113                 if (err)
114                         goto flags_err;
115
116                 flags = flags & EXT4_FL_USER_MODIFIABLE;
117                 flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE;
118                 ei->i_flags = flags;
119
120                 ext4_set_inode_flags(inode);
121                 inode->i_ctime = ext4_current_time(inode);
122
123                 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
124 flags_err:
125                 ext4_journal_stop(handle);
126                 if (err)
127                         goto flags_out;
128
129                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
130                         err = ext4_change_inode_journal_flag(inode, jflag);
131                 if (err)
132                         goto flags_out;
133                 if (migrate)
134                         err = ext4_ext_migrate(inode);
135 flags_out:
136                 mutex_unlock(&inode->i_mutex);
137                 mnt_drop_write(filp->f_path.mnt);
138                 return err;
139         }
140         case EXT4_IOC_GETVERSION:
141         case EXT4_IOC_GETVERSION_OLD:
142                 return put_user(inode->i_generation, (int __user *) arg);
143         case EXT4_IOC_SETVERSION:
144         case EXT4_IOC_SETVERSION_OLD: {
145                 handle_t *handle;
146                 struct ext4_iloc iloc;
147                 __u32 generation;
148                 int err;
149
150                 if (!inode_owner_or_capable(inode))
151                         return -EPERM;
152
153                 err = mnt_want_write(filp->f_path.mnt);
154                 if (err)
155                         return err;
156                 if (get_user(generation, (int __user *) arg)) {
157                         err = -EFAULT;
158                         goto setversion_out;
159                 }
160
161                 handle = ext4_journal_start(inode, 1);
162                 if (IS_ERR(handle)) {
163                         err = PTR_ERR(handle);
164                         goto setversion_out;
165                 }
166                 err = ext4_reserve_inode_write(handle, inode, &iloc);
167                 if (err == 0) {
168                         inode->i_ctime = ext4_current_time(inode);
169                         inode->i_generation = generation;
170                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
171                 }
172                 ext4_journal_stop(handle);
173 setversion_out:
174                 mnt_drop_write(filp->f_path.mnt);
175                 return err;
176         }
177         case EXT4_IOC_GROUP_EXTEND: {
178                 ext4_fsblk_t n_blocks_count;
179                 int err, err2=0;
180
181                 err = ext4_resize_begin(sb);
182                 if (err)
183                         return err;
184
185                 if (get_user(n_blocks_count, (__u32 __user *)arg))
186                         return -EFAULT;
187
188                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
189                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
190                         ext4_msg(sb, KERN_ERR,
191                                  "Online resizing not supported with bigalloc");
192                         return -EOPNOTSUPP;
193                 }
194
195                 err = mnt_want_write(filp->f_path.mnt);
196                 if (err)
197                         return err;
198
199                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
200                 if (EXT4_SB(sb)->s_journal) {
201                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
202                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
203                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
204                 }
205                 if (err == 0)
206                         err = err2;
207                 mnt_drop_write(filp->f_path.mnt);
208                 ext4_resize_end(sb);
209
210                 return err;
211         }
212
213         case EXT4_IOC_MOVE_EXT: {
214                 struct move_extent me;
215                 struct file *donor_filp;
216                 int err;
217
218                 if (!(filp->f_mode & FMODE_READ) ||
219                     !(filp->f_mode & FMODE_WRITE))
220                         return -EBADF;
221
222                 if (copy_from_user(&me,
223                         (struct move_extent __user *)arg, sizeof(me)))
224                         return -EFAULT;
225                 me.moved_len = 0;
226
227                 donor_filp = fget(me.donor_fd);
228                 if (!donor_filp)
229                         return -EBADF;
230
231                 if (!(donor_filp->f_mode & FMODE_WRITE)) {
232                         err = -EBADF;
233                         goto mext_out;
234                 }
235
236                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
237                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
238                         ext4_msg(sb, KERN_ERR,
239                                  "Online defrag not supported with bigalloc");
240                         return -EOPNOTSUPP;
241                 }
242
243                 err = mnt_want_write(filp->f_path.mnt);
244                 if (err)
245                         goto mext_out;
246
247                 err = ext4_move_extents(filp, donor_filp, me.orig_start,
248                                         me.donor_start, me.len, &me.moved_len);
249                 mnt_drop_write(filp->f_path.mnt);
250                 if (me.moved_len > 0)
251                         file_remove_suid(donor_filp);
252
253                 if (copy_to_user((struct move_extent __user *)arg,
254                                  &me, sizeof(me)))
255                         err = -EFAULT;
256 mext_out:
257                 fput(donor_filp);
258                 return err;
259         }
260
261         case EXT4_IOC_GROUP_ADD: {
262                 struct ext4_new_group_data input;
263                 int err, err2=0;
264
265                 err = ext4_resize_begin(sb);
266                 if (err)
267                         return err;
268
269                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
270                                 sizeof(input)))
271                         return -EFAULT;
272
273                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
274                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
275                         ext4_msg(sb, KERN_ERR,
276                                  "Online resizing not supported with bigalloc");
277                         return -EOPNOTSUPP;
278                 }
279
280                 err = mnt_want_write(filp->f_path.mnt);
281                 if (err)
282                         return err;
283
284                 err = ext4_group_add(sb, &input);
285                 if (EXT4_SB(sb)->s_journal) {
286                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
287                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
288                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
289                 }
290                 if (err == 0)
291                         err = err2;
292                 mnt_drop_write(filp->f_path.mnt);
293                 ext4_resize_end(sb);
294
295                 return err;
296         }
297
298         case EXT4_IOC_MIGRATE:
299         {
300                 int err;
301                 if (!inode_owner_or_capable(inode))
302                         return -EACCES;
303
304                 err = mnt_want_write(filp->f_path.mnt);
305                 if (err)
306                         return err;
307                 /*
308                  * inode_mutex prevent write and truncate on the file.
309                  * Read still goes through. We take i_data_sem in
310                  * ext4_ext_swap_inode_data before we switch the
311                  * inode format to prevent read.
312                  */
313                 mutex_lock(&(inode->i_mutex));
314                 err = ext4_ext_migrate(inode);
315                 mutex_unlock(&(inode->i_mutex));
316                 mnt_drop_write(filp->f_path.mnt);
317                 return err;
318         }
319
320         case EXT4_IOC_ALLOC_DA_BLKS:
321         {
322                 int err;
323                 if (!inode_owner_or_capable(inode))
324                         return -EACCES;
325
326                 err = mnt_want_write(filp->f_path.mnt);
327                 if (err)
328                         return err;
329                 err = ext4_alloc_da_blocks(inode);
330                 mnt_drop_write(filp->f_path.mnt);
331                 return err;
332         }
333
334         case FITRIM:
335         {
336                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
337                 struct fstrim_range range;
338                 int ret = 0;
339
340                 if (!capable(CAP_SYS_ADMIN))
341                         return -EPERM;
342
343                 if (!blk_queue_discard(q))
344                         return -EOPNOTSUPP;
345
346                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
347                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
348                         ext4_msg(sb, KERN_ERR,
349                                  "FITRIM not supported with bigalloc");
350                         return -EOPNOTSUPP;
351                 }
352
353                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
354                     sizeof(range)))
355                         return -EFAULT;
356
357                 range.minlen = max((unsigned int)range.minlen,
358                                    q->limits.discard_granularity);
359                 ret = ext4_trim_fs(sb, &range);
360                 if (ret < 0)
361                         return ret;
362
363                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
364                     sizeof(range)))
365                         return -EFAULT;
366
367                 return 0;
368         }
369
370         default:
371                 return -ENOTTY;
372         }
373 }
374
375 #ifdef CONFIG_COMPAT
376 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
377 {
378         /* These are just misnamed, they actually get/put from/to user an int */
379         switch (cmd) {
380         case EXT4_IOC32_GETFLAGS:
381                 cmd = EXT4_IOC_GETFLAGS;
382                 break;
383         case EXT4_IOC32_SETFLAGS:
384                 cmd = EXT4_IOC_SETFLAGS;
385                 break;
386         case EXT4_IOC32_GETVERSION:
387                 cmd = EXT4_IOC_GETVERSION;
388                 break;
389         case EXT4_IOC32_SETVERSION:
390                 cmd = EXT4_IOC_SETVERSION;
391                 break;
392         case EXT4_IOC32_GROUP_EXTEND:
393                 cmd = EXT4_IOC_GROUP_EXTEND;
394                 break;
395         case EXT4_IOC32_GETVERSION_OLD:
396                 cmd = EXT4_IOC_GETVERSION_OLD;
397                 break;
398         case EXT4_IOC32_SETVERSION_OLD:
399                 cmd = EXT4_IOC_SETVERSION_OLD;
400                 break;
401         case EXT4_IOC32_GETRSVSZ:
402                 cmd = EXT4_IOC_GETRSVSZ;
403                 break;
404         case EXT4_IOC32_SETRSVSZ:
405                 cmd = EXT4_IOC_SETRSVSZ;
406                 break;
407         case EXT4_IOC32_GROUP_ADD: {
408                 struct compat_ext4_new_group_input __user *uinput;
409                 struct ext4_new_group_input input;
410                 mm_segment_t old_fs;
411                 int err;
412
413                 uinput = compat_ptr(arg);
414                 err = get_user(input.group, &uinput->group);
415                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
416                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
417                 err |= get_user(input.inode_table, &uinput->inode_table);
418                 err |= get_user(input.blocks_count, &uinput->blocks_count);
419                 err |= get_user(input.reserved_blocks,
420                                 &uinput->reserved_blocks);
421                 if (err)
422                         return -EFAULT;
423                 old_fs = get_fs();
424                 set_fs(KERNEL_DS);
425                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
426                                  (unsigned long) &input);
427                 set_fs(old_fs);
428                 return err;
429         }
430         case EXT4_IOC_MOVE_EXT:
431         case FITRIM:
432                 break;
433         default:
434                 return -ENOIOCTLCMD;
435         }
436         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
437 }
438 #endif