Merge branch 'for_linus' into for_linus_merged
[linux-2.6.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 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
22
23 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
24 {
25         struct inode *inode = filp->f_dentry->d_inode;
26         struct super_block *sb = inode->i_sb;
27         struct ext4_inode_info *ei = EXT4_I(inode);
28         unsigned int flags;
29
30         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
31
32         switch (cmd) {
33         case EXT4_IOC_GETFLAGS:
34                 ext4_get_inode_flags(ei);
35                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
36                 return put_user(flags, (int __user *) arg);
37         case EXT4_IOC_SETFLAGS: {
38                 handle_t *handle = NULL;
39                 int err, migrate = 0;
40                 struct ext4_iloc iloc;
41                 unsigned int oldflags;
42                 unsigned int jflag;
43
44                 if (!inode_owner_or_capable(inode))
45                         return -EACCES;
46
47                 if (get_user(flags, (int __user *) arg))
48                         return -EFAULT;
49
50                 err = mnt_want_write_file(filp);
51                 if (err)
52                         return err;
53
54                 flags = ext4_mask_flags(inode->i_mode, flags);
55
56                 err = -EPERM;
57                 mutex_lock(&inode->i_mutex);
58                 /* Is it quota file? Do not allow user to mess with it */
59                 if (IS_NOQUOTA(inode))
60                         goto flags_out;
61
62                 oldflags = ei->i_flags;
63
64                 /* The JOURNAL_DATA flag is modifiable only by root */
65                 jflag = flags & EXT4_JOURNAL_DATA_FL;
66
67                 /*
68                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
69                  * the relevant capability.
70                  *
71                  * This test looks nicer. Thanks to Pauline Middelink
72                  */
73                 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
74                         if (!capable(CAP_LINUX_IMMUTABLE))
75                                 goto flags_out;
76                 }
77
78                 /*
79                  * The JOURNAL_DATA flag can only be changed by
80                  * the relevant capability.
81                  */
82                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
83                         if (!capable(CAP_SYS_RESOURCE))
84                                 goto flags_out;
85                 }
86                 if (oldflags & EXT4_EXTENTS_FL) {
87                         /* We don't support clearning extent flags */
88                         if (!(flags & EXT4_EXTENTS_FL)) {
89                                 err = -EOPNOTSUPP;
90                                 goto flags_out;
91                         }
92                 } else if (flags & EXT4_EXTENTS_FL) {
93                         /* migrate the file */
94                         migrate = 1;
95                         flags &= ~EXT4_EXTENTS_FL;
96                 }
97
98                 if (flags & EXT4_EOFBLOCKS_FL) {
99                         /* we don't support adding EOFBLOCKS flag */
100                         if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
101                                 err = -EOPNOTSUPP;
102                                 goto flags_out;
103                         }
104                 } else if (oldflags & EXT4_EOFBLOCKS_FL)
105                         ext4_truncate(inode);
106
107                 handle = ext4_journal_start(inode, 1);
108                 if (IS_ERR(handle)) {
109                         err = PTR_ERR(handle);
110                         goto flags_out;
111                 }
112                 if (IS_SYNC(inode))
113                         ext4_handle_sync(handle);
114                 err = ext4_reserve_inode_write(handle, inode, &iloc);
115                 if (err)
116                         goto flags_err;
117
118                 flags = flags & EXT4_FL_USER_MODIFIABLE;
119                 flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE;
120                 ei->i_flags = flags;
121
122                 ext4_set_inode_flags(inode);
123                 inode->i_ctime = ext4_current_time(inode);
124
125                 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
126 flags_err:
127                 ext4_journal_stop(handle);
128                 if (err)
129                         goto flags_out;
130
131                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
132                         err = ext4_change_inode_journal_flag(inode, jflag);
133                 if (err)
134                         goto flags_out;
135                 if (migrate)
136                         err = ext4_ext_migrate(inode);
137 flags_out:
138                 mutex_unlock(&inode->i_mutex);
139                 mnt_drop_write_file(filp);
140                 return err;
141         }
142         case EXT4_IOC_GETVERSION:
143         case EXT4_IOC_GETVERSION_OLD:
144                 return put_user(inode->i_generation, (int __user *) arg);
145         case EXT4_IOC_SETVERSION:
146         case EXT4_IOC_SETVERSION_OLD: {
147                 handle_t *handle;
148                 struct ext4_iloc iloc;
149                 __u32 generation;
150                 int err;
151
152                 if (!inode_owner_or_capable(inode))
153                         return -EPERM;
154
155                 err = mnt_want_write_file(filp);
156                 if (err)
157                         return err;
158                 if (get_user(generation, (int __user *) arg)) {
159                         err = -EFAULT;
160                         goto setversion_out;
161                 }
162
163                 mutex_lock(&inode->i_mutex);
164                 handle = ext4_journal_start(inode, 1);
165                 if (IS_ERR(handle)) {
166                         err = PTR_ERR(handle);
167                         goto unlock_out;
168                 }
169                 err = ext4_reserve_inode_write(handle, inode, &iloc);
170                 if (err == 0) {
171                         inode->i_ctime = ext4_current_time(inode);
172                         inode->i_generation = generation;
173                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
174                 }
175                 ext4_journal_stop(handle);
176
177 unlock_out:
178                 mutex_unlock(&inode->i_mutex);
179 setversion_out:
180                 mnt_drop_write_file(filp);
181                 return err;
182         }
183         case EXT4_IOC_GROUP_EXTEND: {
184                 ext4_fsblk_t n_blocks_count;
185                 int err, err2=0;
186
187                 err = ext4_resize_begin(sb);
188                 if (err)
189                         return err;
190
191                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
192                         err = -EFAULT;
193                         goto group_extend_out;
194                 }
195
196                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
197                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
198                         ext4_msg(sb, KERN_ERR,
199                                  "Online resizing not supported with bigalloc");
200                         err = -EOPNOTSUPP;
201                         goto group_extend_out;
202                 }
203
204                 err = mnt_want_write_file(filp);
205                 if (err)
206                         goto group_extend_out;
207
208                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
209                 if (EXT4_SB(sb)->s_journal) {
210                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
211                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
212                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
213                 }
214                 if (err == 0)
215                         err = err2;
216                 mnt_drop_write_file(filp);
217 group_extend_out:
218                 ext4_resize_end(sb);
219                 return err;
220         }
221
222         case EXT4_IOC_MOVE_EXT: {
223                 struct move_extent me;
224                 struct file *donor_filp;
225                 int err;
226
227                 if (!(filp->f_mode & FMODE_READ) ||
228                     !(filp->f_mode & FMODE_WRITE))
229                         return -EBADF;
230
231                 if (copy_from_user(&me,
232                         (struct move_extent __user *)arg, sizeof(me)))
233                         return -EFAULT;
234                 me.moved_len = 0;
235
236                 donor_filp = fget(me.donor_fd);
237                 if (!donor_filp)
238                         return -EBADF;
239
240                 if (!(donor_filp->f_mode & FMODE_WRITE)) {
241                         err = -EBADF;
242                         goto mext_out;
243                 }
244
245                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
246                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
247                         ext4_msg(sb, KERN_ERR,
248                                  "Online defrag not supported with bigalloc");
249                         return -EOPNOTSUPP;
250                 }
251
252                 err = mnt_want_write_file(filp);
253                 if (err)
254                         goto mext_out;
255
256                 err = ext4_move_extents(filp, donor_filp, me.orig_start,
257                                         me.donor_start, me.len, &me.moved_len);
258                 mnt_drop_write_file(filp);
259                 mnt_drop_write(filp->f_path.mnt);
260
261                 if (copy_to_user((struct move_extent __user *)arg,
262                                  &me, sizeof(me)))
263                         err = -EFAULT;
264 mext_out:
265                 fput(donor_filp);
266                 return err;
267         }
268
269         case EXT4_IOC_GROUP_ADD: {
270                 struct ext4_new_group_data input;
271                 int err, err2=0;
272
273                 err = ext4_resize_begin(sb);
274                 if (err)
275                         return err;
276
277                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
278                                 sizeof(input))) {
279                         err = -EFAULT;
280                         goto group_add_out;
281                 }
282
283                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
284                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
285                         ext4_msg(sb, KERN_ERR,
286                                  "Online resizing not supported with bigalloc");
287                         err = -EOPNOTSUPP;
288                         goto group_add_out;
289                 }
290
291                 err = mnt_want_write_file(filp);
292                 if (err)
293                         goto group_add_out;
294
295                 err = ext4_group_add(sb, &input);
296                 if (EXT4_SB(sb)->s_journal) {
297                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
298                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
299                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
300                 }
301                 if (err == 0)
302                         err = err2;
303                 mnt_drop_write_file(filp);
304 group_add_out:
305                 ext4_resize_end(sb);
306                 return err;
307         }
308
309         case EXT4_IOC_MIGRATE:
310         {
311                 int err;
312                 if (!inode_owner_or_capable(inode))
313                         return -EACCES;
314
315                 err = mnt_want_write_file(filp);
316                 if (err)
317                         return err;
318                 /*
319                  * inode_mutex prevent write and truncate on the file.
320                  * Read still goes through. We take i_data_sem in
321                  * ext4_ext_swap_inode_data before we switch the
322                  * inode format to prevent read.
323                  */
324                 mutex_lock(&(inode->i_mutex));
325                 err = ext4_ext_migrate(inode);
326                 mutex_unlock(&(inode->i_mutex));
327                 mnt_drop_write_file(filp);
328                 return err;
329         }
330
331         case EXT4_IOC_ALLOC_DA_BLKS:
332         {
333                 int err;
334                 if (!inode_owner_or_capable(inode))
335                         return -EACCES;
336
337                 err = mnt_want_write_file(filp);
338                 if (err)
339                         return err;
340                 err = ext4_alloc_da_blocks(inode);
341                 mnt_drop_write_file(filp);
342                 return err;
343         }
344
345         case EXT4_IOC_RESIZE_FS: {
346                 ext4_fsblk_t n_blocks_count;
347                 struct super_block *sb = inode->i_sb;
348                 int err = 0, err2 = 0;
349
350                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
351                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
352                         ext4_msg(sb, KERN_ERR,
353                                  "Online resizing not (yet) supported with bigalloc");
354                         return -EOPNOTSUPP;
355                 }
356
357                 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
358                                EXT4_FEATURE_INCOMPAT_META_BG)) {
359                         ext4_msg(sb, KERN_ERR,
360                                  "Online resizing not (yet) supported with meta_bg");
361                         return -EOPNOTSUPP;
362                 }
363
364                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
365                                    sizeof(__u64))) {
366                         return -EFAULT;
367                 }
368
369                 if (n_blocks_count > MAX_32_NUM &&
370                     !EXT4_HAS_INCOMPAT_FEATURE(sb,
371                                                EXT4_FEATURE_INCOMPAT_64BIT)) {
372                         ext4_msg(sb, KERN_ERR,
373                                  "File system only supports 32-bit block numbers");
374                         return -EOPNOTSUPP;
375                 }
376
377                 err = ext4_resize_begin(sb);
378                 if (err)
379                         return err;
380
381                 err = mnt_want_write(filp->f_path.mnt);
382                 if (err)
383                         goto resizefs_out;
384
385                 err = ext4_resize_fs(sb, n_blocks_count);
386                 if (EXT4_SB(sb)->s_journal) {
387                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
388                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
389                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
390                 }
391                 if (err == 0)
392                         err = err2;
393                 mnt_drop_write(filp->f_path.mnt);
394 resizefs_out:
395                 ext4_resize_end(sb);
396                 return err;
397         }
398
399         case FITRIM:
400         {
401                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
402                 struct fstrim_range range;
403                 int ret = 0;
404
405                 if (!capable(CAP_SYS_ADMIN))
406                         return -EPERM;
407
408                 if (!blk_queue_discard(q))
409                         return -EOPNOTSUPP;
410
411                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
412                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
413                         ext4_msg(sb, KERN_ERR,
414                                  "FITRIM not supported with bigalloc");
415                         return -EOPNOTSUPP;
416                 }
417
418                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
419                     sizeof(range)))
420                         return -EFAULT;
421
422                 range.minlen = max((unsigned int)range.minlen,
423                                    q->limits.discard_granularity);
424                 ret = ext4_trim_fs(sb, &range);
425                 if (ret < 0)
426                         return ret;
427
428                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
429                     sizeof(range)))
430                         return -EFAULT;
431
432                 return 0;
433         }
434
435         default:
436                 return -ENOTTY;
437         }
438 }
439
440 #ifdef CONFIG_COMPAT
441 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
442 {
443         /* These are just misnamed, they actually get/put from/to user an int */
444         switch (cmd) {
445         case EXT4_IOC32_GETFLAGS:
446                 cmd = EXT4_IOC_GETFLAGS;
447                 break;
448         case EXT4_IOC32_SETFLAGS:
449                 cmd = EXT4_IOC_SETFLAGS;
450                 break;
451         case EXT4_IOC32_GETVERSION:
452                 cmd = EXT4_IOC_GETVERSION;
453                 break;
454         case EXT4_IOC32_SETVERSION:
455                 cmd = EXT4_IOC_SETVERSION;
456                 break;
457         case EXT4_IOC32_GROUP_EXTEND:
458                 cmd = EXT4_IOC_GROUP_EXTEND;
459                 break;
460         case EXT4_IOC32_GETVERSION_OLD:
461                 cmd = EXT4_IOC_GETVERSION_OLD;
462                 break;
463         case EXT4_IOC32_SETVERSION_OLD:
464                 cmd = EXT4_IOC_SETVERSION_OLD;
465                 break;
466         case EXT4_IOC32_GETRSVSZ:
467                 cmd = EXT4_IOC_GETRSVSZ;
468                 break;
469         case EXT4_IOC32_SETRSVSZ:
470                 cmd = EXT4_IOC_SETRSVSZ;
471                 break;
472         case EXT4_IOC32_GROUP_ADD: {
473                 struct compat_ext4_new_group_input __user *uinput;
474                 struct ext4_new_group_input input;
475                 mm_segment_t old_fs;
476                 int err;
477
478                 uinput = compat_ptr(arg);
479                 err = get_user(input.group, &uinput->group);
480                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
481                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
482                 err |= get_user(input.inode_table, &uinput->inode_table);
483                 err |= get_user(input.blocks_count, &uinput->blocks_count);
484                 err |= get_user(input.reserved_blocks,
485                                 &uinput->reserved_blocks);
486                 if (err)
487                         return -EFAULT;
488                 old_fs = get_fs();
489                 set_fs(KERNEL_DS);
490                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
491                                  (unsigned long) &input);
492                 set_fs(old_fs);
493                 return err;
494         }
495         case EXT4_IOC_MOVE_EXT:
496         case FITRIM:
497         case EXT4_IOC_RESIZE_FS:
498                 break;
499         default:
500                 return -ENOIOCTLCMD;
501         }
502         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
503 }
504 #endif