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/capability.h>
12 #include <linux/time.h>
13 #include <linux/compat.h>
14 #include <linux/mount.h>
15 #include <linux/file.h>
16 #include <linux/random.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 /**
24 * Swap memory between @a and @b for @len bytes.
25 *
26 * @a: pointer to first memory area
27 * @b: pointer to second memory area
28 * @len: number of bytes to swap
29 *
30 */
memswap(void * a,void * b,size_t len)31 static void memswap(void *a, void *b, size_t len)
32 {
33 unsigned char *ap, *bp;
34
35 ap = (unsigned char *)a;
36 bp = (unsigned char *)b;
37 while (len-- > 0) {
38 swap(*ap, *bp);
39 ap++;
40 bp++;
41 }
42 }
43
44 /**
45 * Swap i_data and associated attributes between @inode1 and @inode2.
46 * This function is used for the primary swap between inode1 and inode2
47 * and also to revert this primary swap in case of errors.
48 *
49 * Therefore you have to make sure, that calling this method twice
50 * will revert all changes.
51 *
52 * @inode1: pointer to first inode
53 * @inode2: pointer to second inode
54 */
swap_inode_data(struct inode * inode1,struct inode * inode2)55 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
56 {
57 loff_t isize;
58 struct ext4_inode_info *ei1;
59 struct ext4_inode_info *ei2;
60
61 ei1 = EXT4_I(inode1);
62 ei2 = EXT4_I(inode2);
63
64 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
65 memswap(&inode1->i_version, &inode2->i_version,
66 sizeof(inode1->i_version));
67 memswap(&inode1->i_blocks, &inode2->i_blocks,
68 sizeof(inode1->i_blocks));
69 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
70 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
71 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
72
73 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
74 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
75 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
76 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
77 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
78
79 isize = i_size_read(inode1);
80 i_size_write(inode1, i_size_read(inode2));
81 i_size_write(inode2, isize);
82 }
83
84 /**
85 * Swap the information from the given @inode and the inode
86 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
87 * important fields of the inodes.
88 *
89 * @sb: the super block of the filesystem
90 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
91 *
92 */
swap_inode_boot_loader(struct super_block * sb,struct inode * inode)93 static long swap_inode_boot_loader(struct super_block *sb,
94 struct inode *inode)
95 {
96 handle_t *handle;
97 int err;
98 struct inode *inode_bl;
99 struct ext4_inode_info *ei_bl;
100 struct ext4_sb_info *sbi = EXT4_SB(sb);
101
102 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
103 return -EINVAL;
104
105 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
106 return -EPERM;
107
108 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
109 if (IS_ERR(inode_bl))
110 return PTR_ERR(inode_bl);
111 ei_bl = EXT4_I(inode_bl);
112
113 filemap_flush(inode->i_mapping);
114 filemap_flush(inode_bl->i_mapping);
115
116 /* Protect orig inodes against a truncate and make sure,
117 * that only 1 swap_inode_boot_loader is running. */
118 lock_two_nondirectories(inode, inode_bl);
119
120 truncate_inode_pages(&inode->i_data, 0);
121 truncate_inode_pages(&inode_bl->i_data, 0);
122
123 /* Wait for all existing dio workers */
124 ext4_inode_block_unlocked_dio(inode);
125 ext4_inode_block_unlocked_dio(inode_bl);
126 inode_dio_wait(inode);
127 inode_dio_wait(inode_bl);
128
129 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
130 if (IS_ERR(handle)) {
131 err = -EINVAL;
132 goto journal_err_out;
133 }
134
135 /* Protect extent tree against block allocations via delalloc */
136 ext4_double_down_write_data_sem(inode, inode_bl);
137
138 if (inode_bl->i_nlink == 0) {
139 /* this inode has never been used as a BOOT_LOADER */
140 set_nlink(inode_bl, 1);
141 i_uid_write(inode_bl, 0);
142 i_gid_write(inode_bl, 0);
143 inode_bl->i_flags = 0;
144 ei_bl->i_flags = 0;
145 inode_bl->i_version = 1;
146 i_size_write(inode_bl, 0);
147 inode_bl->i_mode = S_IFREG;
148 if (ext4_has_feature_extents(sb)) {
149 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
150 ext4_ext_tree_init(handle, inode_bl);
151 } else
152 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
153 }
154
155 swap_inode_data(inode, inode_bl);
156
157 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
158
159 spin_lock(&sbi->s_next_gen_lock);
160 inode->i_generation = sbi->s_next_generation++;
161 inode_bl->i_generation = sbi->s_next_generation++;
162 spin_unlock(&sbi->s_next_gen_lock);
163
164 ext4_discard_preallocations(inode);
165
166 err = ext4_mark_inode_dirty(handle, inode);
167 if (err < 0) {
168 ext4_warning(inode->i_sb,
169 "couldn't mark inode #%lu dirty (err %d)",
170 inode->i_ino, err);
171 /* Revert all changes: */
172 swap_inode_data(inode, inode_bl);
173 } else {
174 err = ext4_mark_inode_dirty(handle, inode_bl);
175 if (err < 0) {
176 ext4_warning(inode_bl->i_sb,
177 "couldn't mark inode #%lu dirty (err %d)",
178 inode_bl->i_ino, err);
179 /* Revert all changes: */
180 swap_inode_data(inode, inode_bl);
181 ext4_mark_inode_dirty(handle, inode);
182 }
183 }
184 ext4_journal_stop(handle);
185 ext4_double_up_write_data_sem(inode, inode_bl);
186
187 journal_err_out:
188 ext4_inode_resume_unlocked_dio(inode);
189 ext4_inode_resume_unlocked_dio(inode_bl);
190 unlock_two_nondirectories(inode, inode_bl);
191 iput(inode_bl);
192 return err;
193 }
194
uuid_is_zero(__u8 u[16])195 static int uuid_is_zero(__u8 u[16])
196 {
197 int i;
198
199 for (i = 0; i < 16; i++)
200 if (u[i])
201 return 0;
202 return 1;
203 }
204
ext4_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)205 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
206 {
207 struct inode *inode = file_inode(filp);
208 struct super_block *sb = inode->i_sb;
209 struct ext4_inode_info *ei = EXT4_I(inode);
210 unsigned int flags;
211
212 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
213
214 switch (cmd) {
215 case EXT4_IOC_GETFLAGS:
216 ext4_get_inode_flags(ei);
217 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
218 return put_user(flags, (int __user *) arg);
219 case EXT4_IOC_SETFLAGS: {
220 handle_t *handle = NULL;
221 int err, migrate = 0;
222 struct ext4_iloc iloc;
223 unsigned int oldflags, mask, i;
224 unsigned int jflag;
225
226 if (!inode_owner_or_capable(inode))
227 return -EACCES;
228
229 if (get_user(flags, (int __user *) arg))
230 return -EFAULT;
231
232 err = mnt_want_write_file(filp);
233 if (err)
234 return err;
235
236 flags = ext4_mask_flags(inode->i_mode, flags);
237
238 err = -EPERM;
239 mutex_lock(&inode->i_mutex);
240 /* Is it quota file? Do not allow user to mess with it */
241 if (IS_NOQUOTA(inode))
242 goto flags_out;
243
244 oldflags = ei->i_flags;
245
246 /* The JOURNAL_DATA flag is modifiable only by root */
247 jflag = flags & EXT4_JOURNAL_DATA_FL;
248
249 /*
250 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
251 * the relevant capability.
252 *
253 * This test looks nicer. Thanks to Pauline Middelink
254 */
255 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
256 if (!capable(CAP_LINUX_IMMUTABLE))
257 goto flags_out;
258 }
259
260 /*
261 * The JOURNAL_DATA flag can only be changed by
262 * the relevant capability.
263 */
264 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
265 if (!capable(CAP_SYS_RESOURCE))
266 goto flags_out;
267 }
268 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
269 migrate = 1;
270
271 if (flags & EXT4_EOFBLOCKS_FL) {
272 /* we don't support adding EOFBLOCKS flag */
273 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
274 err = -EOPNOTSUPP;
275 goto flags_out;
276 }
277 } else if (oldflags & EXT4_EOFBLOCKS_FL)
278 ext4_truncate(inode);
279
280 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
281 if (IS_ERR(handle)) {
282 err = PTR_ERR(handle);
283 goto flags_out;
284 }
285 if (IS_SYNC(inode))
286 ext4_handle_sync(handle);
287 err = ext4_reserve_inode_write(handle, inode, &iloc);
288 if (err)
289 goto flags_err;
290
291 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
292 if (!(mask & EXT4_FL_USER_MODIFIABLE))
293 continue;
294 if (mask & flags)
295 ext4_set_inode_flag(inode, i);
296 else
297 ext4_clear_inode_flag(inode, i);
298 }
299
300 ext4_set_inode_flags(inode);
301 inode->i_ctime = ext4_current_time(inode);
302
303 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
304 flags_err:
305 ext4_journal_stop(handle);
306 if (err)
307 goto flags_out;
308
309 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
310 err = ext4_change_inode_journal_flag(inode, jflag);
311 if (err)
312 goto flags_out;
313 if (migrate) {
314 if (flags & EXT4_EXTENTS_FL)
315 err = ext4_ext_migrate(inode);
316 else
317 err = ext4_ind_migrate(inode);
318 }
319
320 flags_out:
321 mutex_unlock(&inode->i_mutex);
322 mnt_drop_write_file(filp);
323 return err;
324 }
325 case EXT4_IOC_GETVERSION:
326 case EXT4_IOC_GETVERSION_OLD:
327 return put_user(inode->i_generation, (int __user *) arg);
328 case EXT4_IOC_SETVERSION:
329 case EXT4_IOC_SETVERSION_OLD: {
330 handle_t *handle;
331 struct ext4_iloc iloc;
332 __u32 generation;
333 int err;
334
335 if (!inode_owner_or_capable(inode))
336 return -EPERM;
337
338 if (ext4_has_metadata_csum(inode->i_sb)) {
339 ext4_warning(sb, "Setting inode version is not "
340 "supported with metadata_csum enabled.");
341 return -ENOTTY;
342 }
343
344 err = mnt_want_write_file(filp);
345 if (err)
346 return err;
347 if (get_user(generation, (int __user *) arg)) {
348 err = -EFAULT;
349 goto setversion_out;
350 }
351
352 mutex_lock(&inode->i_mutex);
353 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
354 if (IS_ERR(handle)) {
355 err = PTR_ERR(handle);
356 goto unlock_out;
357 }
358 err = ext4_reserve_inode_write(handle, inode, &iloc);
359 if (err == 0) {
360 inode->i_ctime = ext4_current_time(inode);
361 inode->i_generation = generation;
362 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
363 }
364 ext4_journal_stop(handle);
365
366 unlock_out:
367 mutex_unlock(&inode->i_mutex);
368 setversion_out:
369 mnt_drop_write_file(filp);
370 return err;
371 }
372 case EXT4_IOC_GROUP_EXTEND: {
373 ext4_fsblk_t n_blocks_count;
374 int err, err2=0;
375
376 err = ext4_resize_begin(sb);
377 if (err)
378 return err;
379
380 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
381 err = -EFAULT;
382 goto group_extend_out;
383 }
384
385 if (ext4_has_feature_bigalloc(sb)) {
386 ext4_msg(sb, KERN_ERR,
387 "Online resizing not supported with bigalloc");
388 err = -EOPNOTSUPP;
389 goto group_extend_out;
390 }
391
392 err = mnt_want_write_file(filp);
393 if (err)
394 goto group_extend_out;
395
396 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
397 if (EXT4_SB(sb)->s_journal) {
398 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
399 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
400 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
401 }
402 if (err == 0)
403 err = err2;
404 mnt_drop_write_file(filp);
405 group_extend_out:
406 ext4_resize_end(sb);
407 return err;
408 }
409
410 case EXT4_IOC_MOVE_EXT: {
411 struct move_extent me;
412 struct fd donor;
413 int err;
414
415 if (!(filp->f_mode & FMODE_READ) ||
416 !(filp->f_mode & FMODE_WRITE))
417 return -EBADF;
418
419 if (copy_from_user(&me,
420 (struct move_extent __user *)arg, sizeof(me)))
421 return -EFAULT;
422 me.moved_len = 0;
423
424 donor = fdget(me.donor_fd);
425 if (!donor.file)
426 return -EBADF;
427
428 if (!(donor.file->f_mode & FMODE_WRITE)) {
429 err = -EBADF;
430 goto mext_out;
431 }
432
433 if (ext4_has_feature_bigalloc(sb)) {
434 ext4_msg(sb, KERN_ERR,
435 "Online defrag not supported with bigalloc");
436 err = -EOPNOTSUPP;
437 goto mext_out;
438 }
439
440 err = mnt_want_write_file(filp);
441 if (err)
442 goto mext_out;
443
444 err = ext4_move_extents(filp, donor.file, me.orig_start,
445 me.donor_start, me.len, &me.moved_len);
446 mnt_drop_write_file(filp);
447
448 if (copy_to_user((struct move_extent __user *)arg,
449 &me, sizeof(me)))
450 err = -EFAULT;
451 mext_out:
452 fdput(donor);
453 return err;
454 }
455
456 case EXT4_IOC_GROUP_ADD: {
457 struct ext4_new_group_data input;
458 int err, err2=0;
459
460 err = ext4_resize_begin(sb);
461 if (err)
462 return err;
463
464 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
465 sizeof(input))) {
466 err = -EFAULT;
467 goto group_add_out;
468 }
469
470 if (ext4_has_feature_bigalloc(sb)) {
471 ext4_msg(sb, KERN_ERR,
472 "Online resizing not supported with bigalloc");
473 err = -EOPNOTSUPP;
474 goto group_add_out;
475 }
476
477 err = mnt_want_write_file(filp);
478 if (err)
479 goto group_add_out;
480
481 err = ext4_group_add(sb, &input);
482 if (EXT4_SB(sb)->s_journal) {
483 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
484 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
485 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
486 }
487 if (err == 0)
488 err = err2;
489 mnt_drop_write_file(filp);
490 if (!err && ext4_has_group_desc_csum(sb) &&
491 test_opt(sb, INIT_INODE_TABLE))
492 err = ext4_register_li_request(sb, input.group);
493 group_add_out:
494 ext4_resize_end(sb);
495 return err;
496 }
497
498 case EXT4_IOC_MIGRATE:
499 {
500 int err;
501 if (!inode_owner_or_capable(inode))
502 return -EACCES;
503
504 err = mnt_want_write_file(filp);
505 if (err)
506 return err;
507 /*
508 * inode_mutex prevent write and truncate on the file.
509 * Read still goes through. We take i_data_sem in
510 * ext4_ext_swap_inode_data before we switch the
511 * inode format to prevent read.
512 */
513 mutex_lock(&(inode->i_mutex));
514 err = ext4_ext_migrate(inode);
515 mutex_unlock(&(inode->i_mutex));
516 mnt_drop_write_file(filp);
517 return err;
518 }
519
520 case EXT4_IOC_ALLOC_DA_BLKS:
521 {
522 int err;
523 if (!inode_owner_or_capable(inode))
524 return -EACCES;
525
526 err = mnt_want_write_file(filp);
527 if (err)
528 return err;
529 err = ext4_alloc_da_blocks(inode);
530 mnt_drop_write_file(filp);
531 return err;
532 }
533
534 case EXT4_IOC_SWAP_BOOT:
535 {
536 int err;
537 if (!(filp->f_mode & FMODE_WRITE))
538 return -EBADF;
539 err = mnt_want_write_file(filp);
540 if (err)
541 return err;
542 err = swap_inode_boot_loader(sb, inode);
543 mnt_drop_write_file(filp);
544 return err;
545 }
546
547 case EXT4_IOC_RESIZE_FS: {
548 ext4_fsblk_t n_blocks_count;
549 int err = 0, err2 = 0;
550 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
551
552 if (ext4_has_feature_bigalloc(sb)) {
553 ext4_msg(sb, KERN_ERR,
554 "Online resizing not (yet) supported with bigalloc");
555 return -EOPNOTSUPP;
556 }
557
558 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
559 sizeof(__u64))) {
560 return -EFAULT;
561 }
562
563 err = ext4_resize_begin(sb);
564 if (err)
565 return err;
566
567 err = mnt_want_write_file(filp);
568 if (err)
569 goto resizefs_out;
570
571 err = ext4_resize_fs(sb, n_blocks_count);
572 if (EXT4_SB(sb)->s_journal) {
573 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
574 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
575 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
576 }
577 if (err == 0)
578 err = err2;
579 mnt_drop_write_file(filp);
580 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
581 ext4_has_group_desc_csum(sb) &&
582 test_opt(sb, INIT_INODE_TABLE))
583 err = ext4_register_li_request(sb, o_group);
584
585 resizefs_out:
586 ext4_resize_end(sb);
587 return err;
588 }
589
590 case FIDTRIM:
591 case FITRIM:
592 {
593 struct request_queue *q = bdev_get_queue(sb->s_bdev);
594 struct fstrim_range range;
595 int ret = 0;
596 int flags = cmd == FIDTRIM ? BLKDEV_DISCARD_SECURE : 0;
597
598 if (!capable(CAP_SYS_ADMIN))
599 return -EPERM;
600
601 if (!blk_queue_discard(q))
602 return -EOPNOTSUPP;
603
604 if ((flags & BLKDEV_DISCARD_SECURE) && !blk_queue_secdiscard(q))
605 return -EOPNOTSUPP;
606
607 /*
608 * We haven't replayed the journal, so we cannot use our
609 * block-bitmap-guided storage zapping commands.
610 */
611 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
612 return -EROFS;
613
614 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
615 sizeof(range)))
616 return -EFAULT;
617
618 ret = ext4_trim_fs(sb, &range, flags);
619 if (ret < 0)
620 return ret;
621
622 if (copy_to_user((struct fstrim_range __user *)arg, &range,
623 sizeof(range)))
624 return -EFAULT;
625
626 return 0;
627 }
628 case EXT4_IOC_PRECACHE_EXTENTS:
629 return ext4_ext_precache(inode);
630 case EXT4_IOC_SET_ENCRYPTION_POLICY: {
631 #ifdef CONFIG_EXT4_FS_ENCRYPTION
632 struct ext4_encryption_policy policy;
633 int err = 0;
634
635 if (copy_from_user(&policy,
636 (struct ext4_encryption_policy __user *)arg,
637 sizeof(policy))) {
638 err = -EFAULT;
639 goto encryption_policy_out;
640 }
641
642 err = mnt_want_write_file(filp);
643 if (err)
644 goto encryption_policy_out;
645
646 mutex_lock(&inode->i_mutex);
647
648 err = ext4_process_policy(&policy, inode);
649
650 mutex_unlock(&inode->i_mutex);
651
652 mnt_drop_write_file(filp);
653 encryption_policy_out:
654 return err;
655 #else
656 return -EOPNOTSUPP;
657 #endif
658 }
659 case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
660 int err, err2;
661 struct ext4_sb_info *sbi = EXT4_SB(sb);
662 handle_t *handle;
663
664 if (!ext4_sb_has_crypto(sb))
665 return -EOPNOTSUPP;
666 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
667 err = mnt_want_write_file(filp);
668 if (err)
669 return err;
670 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
671 if (IS_ERR(handle)) {
672 err = PTR_ERR(handle);
673 goto pwsalt_err_exit;
674 }
675 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
676 if (err)
677 goto pwsalt_err_journal;
678 lock_buffer(sbi->s_sbh);
679 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
680 ext4_superblock_csum_set(sb);
681 unlock_buffer(sbi->s_sbh);
682 err = ext4_handle_dirty_metadata(handle, NULL,
683 sbi->s_sbh);
684 pwsalt_err_journal:
685 err2 = ext4_journal_stop(handle);
686 if (err2 && !err)
687 err = err2;
688 pwsalt_err_exit:
689 mnt_drop_write_file(filp);
690 if (err)
691 return err;
692 }
693 if (copy_to_user((void __user *) arg,
694 sbi->s_es->s_encrypt_pw_salt, 16))
695 return -EFAULT;
696 return 0;
697 }
698 case EXT4_IOC_GET_ENCRYPTION_POLICY: {
699 #ifdef CONFIG_EXT4_FS_ENCRYPTION
700 struct ext4_encryption_policy policy;
701 int err = 0;
702
703 if (!ext4_encrypted_inode(inode))
704 return -ENOENT;
705 err = ext4_get_policy(inode, &policy);
706 if (err)
707 return err;
708 if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))
709 return -EFAULT;
710 return 0;
711 #else
712 return -EOPNOTSUPP;
713 #endif
714 }
715 default:
716 return -ENOTTY;
717 }
718 }
719
720 #ifdef CONFIG_COMPAT
ext4_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)721 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
722 {
723 /* These are just misnamed, they actually get/put from/to user an int */
724 switch (cmd) {
725 case EXT4_IOC32_GETFLAGS:
726 cmd = EXT4_IOC_GETFLAGS;
727 break;
728 case EXT4_IOC32_SETFLAGS:
729 cmd = EXT4_IOC_SETFLAGS;
730 break;
731 case EXT4_IOC32_GETVERSION:
732 cmd = EXT4_IOC_GETVERSION;
733 break;
734 case EXT4_IOC32_SETVERSION:
735 cmd = EXT4_IOC_SETVERSION;
736 break;
737 case EXT4_IOC32_GROUP_EXTEND:
738 cmd = EXT4_IOC_GROUP_EXTEND;
739 break;
740 case EXT4_IOC32_GETVERSION_OLD:
741 cmd = EXT4_IOC_GETVERSION_OLD;
742 break;
743 case EXT4_IOC32_SETVERSION_OLD:
744 cmd = EXT4_IOC_SETVERSION_OLD;
745 break;
746 case EXT4_IOC32_GETRSVSZ:
747 cmd = EXT4_IOC_GETRSVSZ;
748 break;
749 case EXT4_IOC32_SETRSVSZ:
750 cmd = EXT4_IOC_SETRSVSZ;
751 break;
752 case EXT4_IOC32_GROUP_ADD: {
753 struct compat_ext4_new_group_input __user *uinput;
754 struct ext4_new_group_input input;
755 mm_segment_t old_fs;
756 int err;
757
758 uinput = compat_ptr(arg);
759 err = get_user(input.group, &uinput->group);
760 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
761 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
762 err |= get_user(input.inode_table, &uinput->inode_table);
763 err |= get_user(input.blocks_count, &uinput->blocks_count);
764 err |= get_user(input.reserved_blocks,
765 &uinput->reserved_blocks);
766 if (err)
767 return -EFAULT;
768 old_fs = get_fs();
769 set_fs(KERNEL_DS);
770 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
771 (unsigned long) &input);
772 set_fs(old_fs);
773 return err;
774 }
775 case EXT4_IOC_MOVE_EXT:
776 case EXT4_IOC_RESIZE_FS:
777 case EXT4_IOC_PRECACHE_EXTENTS:
778 case EXT4_IOC_SET_ENCRYPTION_POLICY:
779 case EXT4_IOC_GET_ENCRYPTION_PWSALT:
780 case EXT4_IOC_GET_ENCRYPTION_POLICY:
781 break;
782 default:
783 return -ENOIOCTLCMD;
784 }
785 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
786 }
787 #endif
788