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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 <linux/quotaops.h>
18#include <asm/uaccess.h>
19#include "ext4_jbd2.h"
20#include "ext4.h"
21
22#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
23
24/**
25 * Swap memory between @a and @b for @len bytes.
26 *
27 * @a: pointer to first memory area
28 * @b: pointer to second memory area
29 * @len: number of bytes to swap
30 *
31 */
32static void memswap(void *a, void *b, size_t len)
33{
34 unsigned char *ap, *bp;
35
36 ap = (unsigned char *)a;
37 bp = (unsigned char *)b;
38 while (len-- > 0) {
39 swap(*ap, *bp);
40 ap++;
41 bp++;
42 }
43}
44
45/**
46 * Swap i_data and associated attributes between @inode1 and @inode2.
47 * This function is used for the primary swap between inode1 and inode2
48 * and also to revert this primary swap in case of errors.
49 *
50 * Therefore you have to make sure, that calling this method twice
51 * will revert all changes.
52 *
53 * @inode1: pointer to first inode
54 * @inode2: pointer to second inode
55 */
56static void swap_inode_data(struct inode *inode1, struct inode *inode2)
57{
58 loff_t isize;
59 struct ext4_inode_info *ei1;
60 struct ext4_inode_info *ei2;
61
62 ei1 = EXT4_I(inode1);
63 ei2 = EXT4_I(inode2);
64
65 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
66 memswap(&inode1->i_version, &inode2->i_version,
67 sizeof(inode1->i_version));
68 memswap(&inode1->i_blocks, &inode2->i_blocks,
69 sizeof(inode1->i_blocks));
70 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
71 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
72 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
73
74 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
75 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
76 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
77 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
78 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
79
80 isize = i_size_read(inode1);
81 i_size_write(inode1, i_size_read(inode2));
82 i_size_write(inode2, isize);
83}
84
85/**
86 * Swap the information from the given @inode and the inode
87 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
88 * important fields of the inodes.
89 *
90 * @sb: the super block of the filesystem
91 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
92 *
93 */
94static long swap_inode_boot_loader(struct super_block *sb,
95 struct inode *inode)
96{
97 handle_t *handle;
98 int err;
99 struct inode *inode_bl;
100 struct ext4_inode_info *ei_bl;
101 struct ext4_sb_info *sbi = EXT4_SB(sb);
102
103 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
104 return -EINVAL;
105
106 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
107 return -EPERM;
108
109 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
110 if (IS_ERR(inode_bl))
111 return PTR_ERR(inode_bl);
112 ei_bl = EXT4_I(inode_bl);
113
114 filemap_flush(inode->i_mapping);
115 filemap_flush(inode_bl->i_mapping);
116
117 /* Protect orig inodes against a truncate and make sure,
118 * that only 1 swap_inode_boot_loader is running. */
119 lock_two_nondirectories(inode, inode_bl);
120
121 truncate_inode_pages(&inode->i_data, 0);
122 truncate_inode_pages(&inode_bl->i_data, 0);
123
124 /* Wait for all existing dio workers */
125 ext4_inode_block_unlocked_dio(inode);
126 ext4_inode_block_unlocked_dio(inode_bl);
127 inode_dio_wait(inode);
128 inode_dio_wait(inode_bl);
129
130 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
131 if (IS_ERR(handle)) {
132 err = -EINVAL;
133 goto journal_err_out;
134 }
135
136 /* Protect extent tree against block allocations via delalloc */
137 ext4_double_down_write_data_sem(inode, inode_bl);
138
139 if (inode_bl->i_nlink == 0) {
140 /* this inode has never been used as a BOOT_LOADER */
141 set_nlink(inode_bl, 1);
142 i_uid_write(inode_bl, 0);
143 i_gid_write(inode_bl, 0);
144 inode_bl->i_flags = 0;
145 ei_bl->i_flags = 0;
146 inode_bl->i_version = 1;
147 i_size_write(inode_bl, 0);
148 inode_bl->i_mode = S_IFREG;
149 if (ext4_has_feature_extents(sb)) {
150 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
151 ext4_ext_tree_init(handle, inode_bl);
152 } else
153 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
154 }
155
156 swap_inode_data(inode, inode_bl);
157
158 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
159
160 spin_lock(&sbi->s_next_gen_lock);
161 inode->i_generation = sbi->s_next_generation++;
162 inode_bl->i_generation = sbi->s_next_generation++;
163 spin_unlock(&sbi->s_next_gen_lock);
164
165 ext4_discard_preallocations(inode);
166
167 err = ext4_mark_inode_dirty(handle, inode);
168 if (err < 0) {
169 ext4_warning(inode->i_sb,
170 "couldn't mark inode #%lu dirty (err %d)",
171 inode->i_ino, err);
172 /* Revert all changes: */
173 swap_inode_data(inode, inode_bl);
174 } else {
175 err = ext4_mark_inode_dirty(handle, inode_bl);
176 if (err < 0) {
177 ext4_warning(inode_bl->i_sb,
178 "couldn't mark inode #%lu dirty (err %d)",
179 inode_bl->i_ino, err);
180 /* Revert all changes: */
181 swap_inode_data(inode, inode_bl);
182 ext4_mark_inode_dirty(handle, inode);
183 }
184 }
185 ext4_journal_stop(handle);
186 ext4_double_up_write_data_sem(inode, inode_bl);
187
188journal_err_out:
189 ext4_inode_resume_unlocked_dio(inode);
190 ext4_inode_resume_unlocked_dio(inode_bl);
191 unlock_two_nondirectories(inode, inode_bl);
192 iput(inode_bl);
193 return err;
194}
195
196static int uuid_is_zero(__u8 u[16])
197{
198 int i;
199
200 for (i = 0; i < 16; i++)
201 if (u[i])
202 return 0;
203 return 1;
204}
205
206static int ext4_ioctl_setflags(struct inode *inode,
207 unsigned int flags)
208{
209 struct ext4_inode_info *ei = EXT4_I(inode);
210 handle_t *handle = NULL;
211 int err = -EPERM, migrate = 0;
212 struct ext4_iloc iloc;
213 unsigned int oldflags, mask, i;
214 unsigned int jflag;
215
216 /* Is it quota file? Do not allow user to mess with it */
217 if (IS_NOQUOTA(inode))
218 goto flags_out;
219
220 oldflags = ei->i_flags;
221
222 /* The JOURNAL_DATA flag is modifiable only by root */
223 jflag = flags & EXT4_JOURNAL_DATA_FL;
224
225 /*
226 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
227 * the relevant capability.
228 *
229 * This test looks nicer. Thanks to Pauline Middelink
230 */
231 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
232 if (!capable(CAP_LINUX_IMMUTABLE))
233 goto flags_out;
234 }
235
236 /*
237 * The JOURNAL_DATA flag can only be changed by
238 * the relevant capability.
239 */
240 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
241 if (!capable(CAP_SYS_RESOURCE))
242 goto flags_out;
243 }
244 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
245 migrate = 1;
246
247 if (flags & EXT4_EOFBLOCKS_FL) {
248 /* we don't support adding EOFBLOCKS flag */
249 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
250 err = -EOPNOTSUPP;
251 goto flags_out;
252 }
253 } else if (oldflags & EXT4_EOFBLOCKS_FL)
254 ext4_truncate(inode);
255
256 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
257 if (IS_ERR(handle)) {
258 err = PTR_ERR(handle);
259 goto flags_out;
260 }
261 if (IS_SYNC(inode))
262 ext4_handle_sync(handle);
263 err = ext4_reserve_inode_write(handle, inode, &iloc);
264 if (err)
265 goto flags_err;
266
267 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
268 if (!(mask & EXT4_FL_USER_MODIFIABLE))
269 continue;
270 if (mask & flags)
271 ext4_set_inode_flag(inode, i);
272 else
273 ext4_clear_inode_flag(inode, i);
274 }
275
276 ext4_set_inode_flags(inode);
277 inode->i_ctime = ext4_current_time(inode);
278
279 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
280flags_err:
281 ext4_journal_stop(handle);
282 if (err)
283 goto flags_out;
284
285 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
286 err = ext4_change_inode_journal_flag(inode, jflag);
287 if (err)
288 goto flags_out;
289 if (migrate) {
290 if (flags & EXT4_EXTENTS_FL)
291 err = ext4_ext_migrate(inode);
292 else
293 err = ext4_ind_migrate(inode);
294 }
295
296flags_out:
297 return err;
298}
299
300#ifdef CONFIG_QUOTA
301static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
302{
303 struct inode *inode = file_inode(filp);
304 struct super_block *sb = inode->i_sb;
305 struct ext4_inode_info *ei = EXT4_I(inode);
306 int err, rc;
307 handle_t *handle;
308 kprojid_t kprojid;
309 struct ext4_iloc iloc;
310 struct ext4_inode *raw_inode;
311
312 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
313 EXT4_FEATURE_RO_COMPAT_PROJECT)) {
314 if (projid != EXT4_DEF_PROJID)
315 return -EOPNOTSUPP;
316 else
317 return 0;
318 }
319
320 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
321 return -EOPNOTSUPP;
322
323 kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
324
325 if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
326 return 0;
327
328 err = mnt_want_write_file(filp);
329 if (err)
330 return err;
331
332 err = -EPERM;
333 inode_lock(inode);
334 /* Is it quota file? Do not allow user to mess with it */
335 if (IS_NOQUOTA(inode))
336 goto out_unlock;
337
338 err = ext4_get_inode_loc(inode, &iloc);
339 if (err)
340 goto out_unlock;
341
342 raw_inode = ext4_raw_inode(&iloc);
343 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
344 err = -EOVERFLOW;
345 brelse(iloc.bh);
346 goto out_unlock;
347 }
348 brelse(iloc.bh);
349
350 dquot_initialize(inode);
351
352 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
353 EXT4_QUOTA_INIT_BLOCKS(sb) +
354 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
355 if (IS_ERR(handle)) {
356 err = PTR_ERR(handle);
357 goto out_unlock;
358 }
359
360 err = ext4_reserve_inode_write(handle, inode, &iloc);
361 if (err)
362 goto out_stop;
363
364 if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
365 struct dquot *transfer_to[MAXQUOTAS] = { };
366
367 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
368 if (transfer_to[PRJQUOTA]) {
369 err = __dquot_transfer(inode, transfer_to);
370 dqput(transfer_to[PRJQUOTA]);
371 if (err)
372 goto out_dirty;
373 }
374 }
375 EXT4_I(inode)->i_projid = kprojid;
376 inode->i_ctime = ext4_current_time(inode);
377out_dirty:
378 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
379 if (!err)
380 err = rc;
381out_stop:
382 ext4_journal_stop(handle);
383out_unlock:
384 inode_unlock(inode);
385 mnt_drop_write_file(filp);
386 return err;
387}
388#else
389static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
390{
391 if (projid != EXT4_DEF_PROJID)
392 return -EOPNOTSUPP;
393 return 0;
394}
395#endif
396
397/* Transfer internal flags to xflags */
398static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
399{
400 __u32 xflags = 0;
401
402 if (iflags & EXT4_SYNC_FL)
403 xflags |= FS_XFLAG_SYNC;
404 if (iflags & EXT4_IMMUTABLE_FL)
405 xflags |= FS_XFLAG_IMMUTABLE;
406 if (iflags & EXT4_APPEND_FL)
407 xflags |= FS_XFLAG_APPEND;
408 if (iflags & EXT4_NODUMP_FL)
409 xflags |= FS_XFLAG_NODUMP;
410 if (iflags & EXT4_NOATIME_FL)
411 xflags |= FS_XFLAG_NOATIME;
412 if (iflags & EXT4_PROJINHERIT_FL)
413 xflags |= FS_XFLAG_PROJINHERIT;
414 return xflags;
415}
416
417/* Transfer xflags flags to internal */
418static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
419{
420 unsigned long iflags = 0;
421
422 if (xflags & FS_XFLAG_SYNC)
423 iflags |= EXT4_SYNC_FL;
424 if (xflags & FS_XFLAG_IMMUTABLE)
425 iflags |= EXT4_IMMUTABLE_FL;
426 if (xflags & FS_XFLAG_APPEND)
427 iflags |= EXT4_APPEND_FL;
428 if (xflags & FS_XFLAG_NODUMP)
429 iflags |= EXT4_NODUMP_FL;
430 if (xflags & FS_XFLAG_NOATIME)
431 iflags |= EXT4_NOATIME_FL;
432 if (xflags & FS_XFLAG_PROJINHERIT)
433 iflags |= EXT4_PROJINHERIT_FL;
434
435 return iflags;
436}
437
438long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
439{
440 struct inode *inode = file_inode(filp);
441 struct super_block *sb = inode->i_sb;
442 struct ext4_inode_info *ei = EXT4_I(inode);
443 unsigned int flags;
444
445 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
446
447 switch (cmd) {
448 case EXT4_IOC_GETFLAGS:
449 ext4_get_inode_flags(ei);
450 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
451 return put_user(flags, (int __user *) arg);
452 case EXT4_IOC_SETFLAGS: {
453 int err;
454
455 if (!inode_owner_or_capable(inode))
456 return -EACCES;
457
458 if (get_user(flags, (int __user *) arg))
459 return -EFAULT;
460
461 err = mnt_want_write_file(filp);
462 if (err)
463 return err;
464
465 flags = ext4_mask_flags(inode->i_mode, flags);
466
467 inode_lock(inode);
468 err = ext4_ioctl_setflags(inode, flags);
469 inode_unlock(inode);
470 mnt_drop_write_file(filp);
471 return err;
472 }
473 case EXT4_IOC_GETVERSION:
474 case EXT4_IOC_GETVERSION_OLD:
475 return put_user(inode->i_generation, (int __user *) arg);
476 case EXT4_IOC_SETVERSION:
477 case EXT4_IOC_SETVERSION_OLD: {
478 handle_t *handle;
479 struct ext4_iloc iloc;
480 __u32 generation;
481 int err;
482
483 if (!inode_owner_or_capable(inode))
484 return -EPERM;
485
486 if (ext4_has_metadata_csum(inode->i_sb)) {
487 ext4_warning(sb, "Setting inode version is not "
488 "supported with metadata_csum enabled.");
489 return -ENOTTY;
490 }
491
492 err = mnt_want_write_file(filp);
493 if (err)
494 return err;
495 if (get_user(generation, (int __user *) arg)) {
496 err = -EFAULT;
497 goto setversion_out;
498 }
499
500 inode_lock(inode);
501 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
502 if (IS_ERR(handle)) {
503 err = PTR_ERR(handle);
504 goto unlock_out;
505 }
506 err = ext4_reserve_inode_write(handle, inode, &iloc);
507 if (err == 0) {
508 inode->i_ctime = ext4_current_time(inode);
509 inode->i_generation = generation;
510 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
511 }
512 ext4_journal_stop(handle);
513
514unlock_out:
515 inode_unlock(inode);
516setversion_out:
517 mnt_drop_write_file(filp);
518 return err;
519 }
520 case EXT4_IOC_GROUP_EXTEND: {
521 ext4_fsblk_t n_blocks_count;
522 int err, err2=0;
523
524 err = ext4_resize_begin(sb);
525 if (err)
526 return err;
527
528 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
529 err = -EFAULT;
530 goto group_extend_out;
531 }
532
533 if (ext4_has_feature_bigalloc(sb)) {
534 ext4_msg(sb, KERN_ERR,
535 "Online resizing not supported with bigalloc");
536 err = -EOPNOTSUPP;
537 goto group_extend_out;
538 }
539
540 err = mnt_want_write_file(filp);
541 if (err)
542 goto group_extend_out;
543
544 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
545 if (EXT4_SB(sb)->s_journal) {
546 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
547 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
548 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
549 }
550 if (err == 0)
551 err = err2;
552 mnt_drop_write_file(filp);
553group_extend_out:
554 ext4_resize_end(sb);
555 return err;
556 }
557
558 case EXT4_IOC_MOVE_EXT: {
559 struct move_extent me;
560 struct fd donor;
561 int err;
562
563 if (!(filp->f_mode & FMODE_READ) ||
564 !(filp->f_mode & FMODE_WRITE))
565 return -EBADF;
566
567 if (copy_from_user(&me,
568 (struct move_extent __user *)arg, sizeof(me)))
569 return -EFAULT;
570 me.moved_len = 0;
571
572 donor = fdget(me.donor_fd);
573 if (!donor.file)
574 return -EBADF;
575
576 if (!(donor.file->f_mode & FMODE_WRITE)) {
577 err = -EBADF;
578 goto mext_out;
579 }
580
581 if (ext4_has_feature_bigalloc(sb)) {
582 ext4_msg(sb, KERN_ERR,
583 "Online defrag not supported with bigalloc");
584 err = -EOPNOTSUPP;
585 goto mext_out;
586 } else if (IS_DAX(inode)) {
587 ext4_msg(sb, KERN_ERR,
588 "Online defrag not supported with DAX");
589 err = -EOPNOTSUPP;
590 goto mext_out;
591 }
592
593 err = mnt_want_write_file(filp);
594 if (err)
595 goto mext_out;
596
597 err = ext4_move_extents(filp, donor.file, me.orig_start,
598 me.donor_start, me.len, &me.moved_len);
599 mnt_drop_write_file(filp);
600
601 if (copy_to_user((struct move_extent __user *)arg,
602 &me, sizeof(me)))
603 err = -EFAULT;
604mext_out:
605 fdput(donor);
606 return err;
607 }
608
609 case EXT4_IOC_GROUP_ADD: {
610 struct ext4_new_group_data input;
611 int err, err2=0;
612
613 err = ext4_resize_begin(sb);
614 if (err)
615 return err;
616
617 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
618 sizeof(input))) {
619 err = -EFAULT;
620 goto group_add_out;
621 }
622
623 if (ext4_has_feature_bigalloc(sb)) {
624 ext4_msg(sb, KERN_ERR,
625 "Online resizing not supported with bigalloc");
626 err = -EOPNOTSUPP;
627 goto group_add_out;
628 }
629
630 err = mnt_want_write_file(filp);
631 if (err)
632 goto group_add_out;
633
634 err = ext4_group_add(sb, &input);
635 if (EXT4_SB(sb)->s_journal) {
636 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
637 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
638 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
639 }
640 if (err == 0)
641 err = err2;
642 mnt_drop_write_file(filp);
643 if (!err && ext4_has_group_desc_csum(sb) &&
644 test_opt(sb, INIT_INODE_TABLE))
645 err = ext4_register_li_request(sb, input.group);
646group_add_out:
647 ext4_resize_end(sb);
648 return err;
649 }
650
651 case EXT4_IOC_MIGRATE:
652 {
653 int err;
654 if (!inode_owner_or_capable(inode))
655 return -EACCES;
656
657 err = mnt_want_write_file(filp);
658 if (err)
659 return err;
660 /*
661 * inode_mutex prevent write and truncate on the file.
662 * Read still goes through. We take i_data_sem in
663 * ext4_ext_swap_inode_data before we switch the
664 * inode format to prevent read.
665 */
666 inode_lock((inode));
667 err = ext4_ext_migrate(inode);
668 inode_unlock((inode));
669 mnt_drop_write_file(filp);
670 return err;
671 }
672
673 case EXT4_IOC_ALLOC_DA_BLKS:
674 {
675 int err;
676 if (!inode_owner_or_capable(inode))
677 return -EACCES;
678
679 err = mnt_want_write_file(filp);
680 if (err)
681 return err;
682 err = ext4_alloc_da_blocks(inode);
683 mnt_drop_write_file(filp);
684 return err;
685 }
686
687 case EXT4_IOC_SWAP_BOOT:
688 {
689 int err;
690 if (!(filp->f_mode & FMODE_WRITE))
691 return -EBADF;
692 err = mnt_want_write_file(filp);
693 if (err)
694 return err;
695 err = swap_inode_boot_loader(sb, inode);
696 mnt_drop_write_file(filp);
697 return err;
698 }
699
700 case EXT4_IOC_RESIZE_FS: {
701 ext4_fsblk_t n_blocks_count;
702 int err = 0, err2 = 0;
703 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
704
705 if (ext4_has_feature_bigalloc(sb)) {
706 ext4_msg(sb, KERN_ERR,
707 "Online resizing not (yet) supported with bigalloc");
708 return -EOPNOTSUPP;
709 }
710
711 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
712 sizeof(__u64))) {
713 return -EFAULT;
714 }
715
716 err = ext4_resize_begin(sb);
717 if (err)
718 return err;
719
720 err = mnt_want_write_file(filp);
721 if (err)
722 goto resizefs_out;
723
724 err = ext4_resize_fs(sb, n_blocks_count);
725 if (EXT4_SB(sb)->s_journal) {
726 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
727 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
728 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
729 }
730 if (err == 0)
731 err = err2;
732 mnt_drop_write_file(filp);
733 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
734 ext4_has_group_desc_csum(sb) &&
735 test_opt(sb, INIT_INODE_TABLE))
736 err = ext4_register_li_request(sb, o_group);
737
738resizefs_out:
739 ext4_resize_end(sb);
740 return err;
741 }
742
743 case FITRIM:
744 {
745 struct request_queue *q = bdev_get_queue(sb->s_bdev);
746 struct fstrim_range range;
747 int ret = 0;
748
749 if (!capable(CAP_SYS_ADMIN))
750 return -EPERM;
751
752 if (!blk_queue_discard(q))
753 return -EOPNOTSUPP;
754
755 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
756 sizeof(range)))
757 return -EFAULT;
758
759 range.minlen = max((unsigned int)range.minlen,
760 q->limits.discard_granularity);
761 ret = ext4_trim_fs(sb, &range);
762 if (ret < 0)
763 return ret;
764
765 if (copy_to_user((struct fstrim_range __user *)arg, &range,
766 sizeof(range)))
767 return -EFAULT;
768
769 return 0;
770 }
771 case EXT4_IOC_PRECACHE_EXTENTS:
772 return ext4_ext_precache(inode);
773 case EXT4_IOC_SET_ENCRYPTION_POLICY: {
774#ifdef CONFIG_EXT4_FS_ENCRYPTION
775 struct ext4_encryption_policy policy;
776 int err = 0;
777
778 if (copy_from_user(&policy,
779 (struct ext4_encryption_policy __user *)arg,
780 sizeof(policy))) {
781 err = -EFAULT;
782 goto encryption_policy_out;
783 }
784
785 err = ext4_process_policy(&policy, inode);
786encryption_policy_out:
787 return err;
788#else
789 return -EOPNOTSUPP;
790#endif
791 }
792 case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
793 int err, err2;
794 struct ext4_sb_info *sbi = EXT4_SB(sb);
795 handle_t *handle;
796
797 if (!ext4_sb_has_crypto(sb))
798 return -EOPNOTSUPP;
799 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
800 err = mnt_want_write_file(filp);
801 if (err)
802 return err;
803 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
804 if (IS_ERR(handle)) {
805 err = PTR_ERR(handle);
806 goto pwsalt_err_exit;
807 }
808 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
809 if (err)
810 goto pwsalt_err_journal;
811 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
812 err = ext4_handle_dirty_metadata(handle, NULL,
813 sbi->s_sbh);
814 pwsalt_err_journal:
815 err2 = ext4_journal_stop(handle);
816 if (err2 && !err)
817 err = err2;
818 pwsalt_err_exit:
819 mnt_drop_write_file(filp);
820 if (err)
821 return err;
822 }
823 if (copy_to_user((void __user *) arg,
824 sbi->s_es->s_encrypt_pw_salt, 16))
825 return -EFAULT;
826 return 0;
827 }
828 case EXT4_IOC_GET_ENCRYPTION_POLICY: {
829#ifdef CONFIG_EXT4_FS_ENCRYPTION
830 struct ext4_encryption_policy policy;
831 int err = 0;
832
833 if (!ext4_encrypted_inode(inode))
834 return -ENOENT;
835 err = ext4_get_policy(inode, &policy);
836 if (err)
837 return err;
838 if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))
839 return -EFAULT;
840 return 0;
841#else
842 return -EOPNOTSUPP;
843#endif
844 }
845 case EXT4_IOC_FSGETXATTR:
846 {
847 struct fsxattr fa;
848
849 memset(&fa, 0, sizeof(struct fsxattr));
850 ext4_get_inode_flags(ei);
851 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
852
853 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
854 EXT4_FEATURE_RO_COMPAT_PROJECT)) {
855 fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
856 EXT4_I(inode)->i_projid);
857 }
858
859 if (copy_to_user((struct fsxattr __user *)arg,
860 &fa, sizeof(fa)))
861 return -EFAULT;
862 return 0;
863 }
864 case EXT4_IOC_FSSETXATTR:
865 {
866 struct fsxattr fa;
867 int err;
868
869 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
870 sizeof(fa)))
871 return -EFAULT;
872
873 /* Make sure caller has proper permission */
874 if (!inode_owner_or_capable(inode))
875 return -EACCES;
876
877 err = mnt_want_write_file(filp);
878 if (err)
879 return err;
880
881 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
882 flags = ext4_mask_flags(inode->i_mode, flags);
883
884 inode_lock(inode);
885 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
886 (flags & EXT4_FL_XFLAG_VISIBLE);
887 err = ext4_ioctl_setflags(inode, flags);
888 inode_unlock(inode);
889 mnt_drop_write_file(filp);
890 if (err)
891 return err;
892
893 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
894 if (err)
895 return err;
896
897 return 0;
898 }
899 default:
900 return -ENOTTY;
901 }
902}
903
904#ifdef CONFIG_COMPAT
905long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
906{
907 /* These are just misnamed, they actually get/put from/to user an int */
908 switch (cmd) {
909 case EXT4_IOC32_GETFLAGS:
910 cmd = EXT4_IOC_GETFLAGS;
911 break;
912 case EXT4_IOC32_SETFLAGS:
913 cmd = EXT4_IOC_SETFLAGS;
914 break;
915 case EXT4_IOC32_GETVERSION:
916 cmd = EXT4_IOC_GETVERSION;
917 break;
918 case EXT4_IOC32_SETVERSION:
919 cmd = EXT4_IOC_SETVERSION;
920 break;
921 case EXT4_IOC32_GROUP_EXTEND:
922 cmd = EXT4_IOC_GROUP_EXTEND;
923 break;
924 case EXT4_IOC32_GETVERSION_OLD:
925 cmd = EXT4_IOC_GETVERSION_OLD;
926 break;
927 case EXT4_IOC32_SETVERSION_OLD:
928 cmd = EXT4_IOC_SETVERSION_OLD;
929 break;
930 case EXT4_IOC32_GETRSVSZ:
931 cmd = EXT4_IOC_GETRSVSZ;
932 break;
933 case EXT4_IOC32_SETRSVSZ:
934 cmd = EXT4_IOC_SETRSVSZ;
935 break;
936 case EXT4_IOC32_GROUP_ADD: {
937 struct compat_ext4_new_group_input __user *uinput;
938 struct ext4_new_group_input input;
939 mm_segment_t old_fs;
940 int err;
941
942 uinput = compat_ptr(arg);
943 err = get_user(input.group, &uinput->group);
944 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
945 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
946 err |= get_user(input.inode_table, &uinput->inode_table);
947 err |= get_user(input.blocks_count, &uinput->blocks_count);
948 err |= get_user(input.reserved_blocks,
949 &uinput->reserved_blocks);
950 if (err)
951 return -EFAULT;
952 old_fs = get_fs();
953 set_fs(KERNEL_DS);
954 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
955 (unsigned long) &input);
956 set_fs(old_fs);
957 return err;
958 }
959 case EXT4_IOC_MOVE_EXT:
960 case EXT4_IOC_RESIZE_FS:
961 case EXT4_IOC_PRECACHE_EXTENTS:
962 case EXT4_IOC_SET_ENCRYPTION_POLICY:
963 case EXT4_IOC_GET_ENCRYPTION_PWSALT:
964 case EXT4_IOC_GET_ENCRYPTION_POLICY:
965 break;
966 default:
967 return -ENOIOCTLCMD;
968 }
969 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
970}
971#endif
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
21long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
22{
23 struct inode *inode = filp->f_dentry->d_inode;
24 struct ext4_inode_info *ei = EXT4_I(inode);
25 unsigned int flags;
26
27 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
28
29 switch (cmd) {
30 case EXT4_IOC_GETFLAGS:
31 ext4_get_inode_flags(ei);
32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
33 return put_user(flags, (int __user *) arg);
34 case EXT4_IOC_SETFLAGS: {
35 handle_t *handle = NULL;
36 int err, migrate = 0;
37 struct ext4_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 = ext4_mask_flags(inode->i_mode, flags);
52
53 err = -EPERM;
54 mutex_lock(&inode->i_mutex);
55 /* Is it quota file? Do not allow user to mess with it */
56 if (IS_NOQUOTA(inode))
57 goto flags_out;
58
59 oldflags = ei->i_flags;
60
61 /* The JOURNAL_DATA flag is modifiable only by root */
62 jflag = flags & EXT4_JOURNAL_DATA_FL;
63
64 /*
65 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
66 * the relevant capability.
67 *
68 * This test looks nicer. Thanks to Pauline Middelink
69 */
70 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
71 if (!capable(CAP_LINUX_IMMUTABLE))
72 goto flags_out;
73 }
74
75 /*
76 * The JOURNAL_DATA flag can only be changed by
77 * the relevant capability.
78 */
79 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
80 if (!capable(CAP_SYS_RESOURCE))
81 goto flags_out;
82 }
83 if (oldflags & EXT4_EXTENTS_FL) {
84 /* We don't support clearning extent flags */
85 if (!(flags & EXT4_EXTENTS_FL)) {
86 err = -EOPNOTSUPP;
87 goto flags_out;
88 }
89 } else if (flags & EXT4_EXTENTS_FL) {
90 /* migrate the file */
91 migrate = 1;
92 flags &= ~EXT4_EXTENTS_FL;
93 }
94
95 if (flags & EXT4_EOFBLOCKS_FL) {
96 /* we don't support adding EOFBLOCKS flag */
97 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
98 err = -EOPNOTSUPP;
99 goto flags_out;
100 }
101 } else if (oldflags & EXT4_EOFBLOCKS_FL)
102 ext4_truncate(inode);
103
104 handle = ext4_journal_start(inode, 1);
105 if (IS_ERR(handle)) {
106 err = PTR_ERR(handle);
107 goto flags_out;
108 }
109 if (IS_SYNC(inode))
110 ext4_handle_sync(handle);
111 err = ext4_reserve_inode_write(handle, inode, &iloc);
112 if (err)
113 goto flags_err;
114
115 flags = flags & EXT4_FL_USER_MODIFIABLE;
116 flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE;
117 ei->i_flags = flags;
118
119 ext4_set_inode_flags(inode);
120 inode->i_ctime = ext4_current_time(inode);
121
122 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
123flags_err:
124 ext4_journal_stop(handle);
125 if (err)
126 goto flags_out;
127
128 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
129 err = ext4_change_inode_journal_flag(inode, jflag);
130 if (err)
131 goto flags_out;
132 if (migrate)
133 err = ext4_ext_migrate(inode);
134flags_out:
135 mutex_unlock(&inode->i_mutex);
136 mnt_drop_write(filp->f_path.mnt);
137 return err;
138 }
139 case EXT4_IOC_GETVERSION:
140 case EXT4_IOC_GETVERSION_OLD:
141 return put_user(inode->i_generation, (int __user *) arg);
142 case EXT4_IOC_SETVERSION:
143 case EXT4_IOC_SETVERSION_OLD: {
144 handle_t *handle;
145 struct ext4_iloc iloc;
146 __u32 generation;
147 int err;
148
149 if (!inode_owner_or_capable(inode))
150 return -EPERM;
151
152 err = mnt_want_write(filp->f_path.mnt);
153 if (err)
154 return err;
155 if (get_user(generation, (int __user *) arg)) {
156 err = -EFAULT;
157 goto setversion_out;
158 }
159
160 handle = ext4_journal_start(inode, 1);
161 if (IS_ERR(handle)) {
162 err = PTR_ERR(handle);
163 goto setversion_out;
164 }
165 err = ext4_reserve_inode_write(handle, inode, &iloc);
166 if (err == 0) {
167 inode->i_ctime = ext4_current_time(inode);
168 inode->i_generation = generation;
169 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
170 }
171 ext4_journal_stop(handle);
172setversion_out:
173 mnt_drop_write(filp->f_path.mnt);
174 return err;
175 }
176#ifdef CONFIG_JBD2_DEBUG
177 case EXT4_IOC_WAIT_FOR_READONLY:
178 /*
179 * This is racy - by the time we're woken up and running,
180 * the superblock could be released. And the module could
181 * have been unloaded. So sue me.
182 *
183 * Returns 1 if it slept, else zero.
184 */
185 {
186 struct super_block *sb = inode->i_sb;
187 DECLARE_WAITQUEUE(wait, current);
188 int ret = 0;
189
190 set_current_state(TASK_INTERRUPTIBLE);
191 add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
192 if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) {
193 schedule();
194 ret = 1;
195 }
196 remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
197 return ret;
198 }
199#endif
200 case EXT4_IOC_GROUP_EXTEND: {
201 ext4_fsblk_t n_blocks_count;
202 struct super_block *sb = inode->i_sb;
203 int err, err2=0;
204
205 err = ext4_resize_begin(sb);
206 if (err)
207 return err;
208
209 if (get_user(n_blocks_count, (__u32 __user *)arg))
210 return -EFAULT;
211
212 err = mnt_want_write(filp->f_path.mnt);
213 if (err)
214 return err;
215
216 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
217 if (EXT4_SB(sb)->s_journal) {
218 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
219 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
220 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
221 }
222 if (err == 0)
223 err = err2;
224 mnt_drop_write(filp->f_path.mnt);
225 ext4_resize_end(sb);
226
227 return err;
228 }
229
230 case EXT4_IOC_MOVE_EXT: {
231 struct move_extent me;
232 struct file *donor_filp;
233 int err;
234
235 if (!(filp->f_mode & FMODE_READ) ||
236 !(filp->f_mode & FMODE_WRITE))
237 return -EBADF;
238
239 if (copy_from_user(&me,
240 (struct move_extent __user *)arg, sizeof(me)))
241 return -EFAULT;
242 me.moved_len = 0;
243
244 donor_filp = fget(me.donor_fd);
245 if (!donor_filp)
246 return -EBADF;
247
248 if (!(donor_filp->f_mode & FMODE_WRITE)) {
249 err = -EBADF;
250 goto mext_out;
251 }
252
253 err = mnt_want_write(filp->f_path.mnt);
254 if (err)
255 goto mext_out;
256
257 err = ext4_move_extents(filp, donor_filp, me.orig_start,
258 me.donor_start, me.len, &me.moved_len);
259 mnt_drop_write(filp->f_path.mnt);
260 if (me.moved_len > 0)
261 file_remove_suid(donor_filp);
262
263 if (copy_to_user((struct move_extent __user *)arg,
264 &me, sizeof(me)))
265 err = -EFAULT;
266mext_out:
267 fput(donor_filp);
268 return err;
269 }
270
271 case EXT4_IOC_GROUP_ADD: {
272 struct ext4_new_group_data input;
273 struct super_block *sb = inode->i_sb;
274 int err, err2=0;
275
276 err = ext4_resize_begin(sb);
277 if (err)
278 return err;
279
280 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
281 sizeof(input)))
282 return -EFAULT;
283
284 err = mnt_want_write(filp->f_path.mnt);
285 if (err)
286 return err;
287
288 err = ext4_group_add(sb, &input);
289 if (EXT4_SB(sb)->s_journal) {
290 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
291 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
292 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
293 }
294 if (err == 0)
295 err = err2;
296 mnt_drop_write(filp->f_path.mnt);
297 ext4_resize_end(sb);
298
299 return err;
300 }
301
302 case EXT4_IOC_MIGRATE:
303 {
304 int err;
305 if (!inode_owner_or_capable(inode))
306 return -EACCES;
307
308 err = mnt_want_write(filp->f_path.mnt);
309 if (err)
310 return err;
311 /*
312 * inode_mutex prevent write and truncate on the file.
313 * Read still goes through. We take i_data_sem in
314 * ext4_ext_swap_inode_data before we switch the
315 * inode format to prevent read.
316 */
317 mutex_lock(&(inode->i_mutex));
318 err = ext4_ext_migrate(inode);
319 mutex_unlock(&(inode->i_mutex));
320 mnt_drop_write(filp->f_path.mnt);
321 return err;
322 }
323
324 case EXT4_IOC_ALLOC_DA_BLKS:
325 {
326 int err;
327 if (!inode_owner_or_capable(inode))
328 return -EACCES;
329
330 err = mnt_want_write(filp->f_path.mnt);
331 if (err)
332 return err;
333 err = ext4_alloc_da_blocks(inode);
334 mnt_drop_write(filp->f_path.mnt);
335 return err;
336 }
337
338 case FITRIM:
339 {
340 struct super_block *sb = inode->i_sb;
341 struct request_queue *q = bdev_get_queue(sb->s_bdev);
342 struct fstrim_range range;
343 int ret = 0;
344
345 if (!capable(CAP_SYS_ADMIN))
346 return -EPERM;
347
348 if (!blk_queue_discard(q))
349 return -EOPNOTSUPP;
350
351 if (copy_from_user(&range, (struct fstrim_range *)arg,
352 sizeof(range)))
353 return -EFAULT;
354
355 range.minlen = max((unsigned int)range.minlen,
356 q->limits.discard_granularity);
357 ret = ext4_trim_fs(sb, &range);
358 if (ret < 0)
359 return ret;
360
361 if (copy_to_user((struct fstrim_range *)arg, &range,
362 sizeof(range)))
363 return -EFAULT;
364
365 return 0;
366 }
367
368 default:
369 return -ENOTTY;
370 }
371}
372
373#ifdef CONFIG_COMPAT
374long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
375{
376 /* These are just misnamed, they actually get/put from/to user an int */
377 switch (cmd) {
378 case EXT4_IOC32_GETFLAGS:
379 cmd = EXT4_IOC_GETFLAGS;
380 break;
381 case EXT4_IOC32_SETFLAGS:
382 cmd = EXT4_IOC_SETFLAGS;
383 break;
384 case EXT4_IOC32_GETVERSION:
385 cmd = EXT4_IOC_GETVERSION;
386 break;
387 case EXT4_IOC32_SETVERSION:
388 cmd = EXT4_IOC_SETVERSION;
389 break;
390 case EXT4_IOC32_GROUP_EXTEND:
391 cmd = EXT4_IOC_GROUP_EXTEND;
392 break;
393 case EXT4_IOC32_GETVERSION_OLD:
394 cmd = EXT4_IOC_GETVERSION_OLD;
395 break;
396 case EXT4_IOC32_SETVERSION_OLD:
397 cmd = EXT4_IOC_SETVERSION_OLD;
398 break;
399#ifdef CONFIG_JBD2_DEBUG
400 case EXT4_IOC32_WAIT_FOR_READONLY:
401 cmd = EXT4_IOC_WAIT_FOR_READONLY;
402 break;
403#endif
404 case EXT4_IOC32_GETRSVSZ:
405 cmd = EXT4_IOC_GETRSVSZ;
406 break;
407 case EXT4_IOC32_SETRSVSZ:
408 cmd = EXT4_IOC_SETRSVSZ;
409 break;
410 case EXT4_IOC32_GROUP_ADD: {
411 struct compat_ext4_new_group_input __user *uinput;
412 struct ext4_new_group_input input;
413 mm_segment_t old_fs;
414 int err;
415
416 uinput = compat_ptr(arg);
417 err = get_user(input.group, &uinput->group);
418 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
419 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
420 err |= get_user(input.inode_table, &uinput->inode_table);
421 err |= get_user(input.blocks_count, &uinput->blocks_count);
422 err |= get_user(input.reserved_blocks,
423 &uinput->reserved_blocks);
424 if (err)
425 return -EFAULT;
426 old_fs = get_fs();
427 set_fs(KERNEL_DS);
428 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
429 (unsigned long) &input);
430 set_fs(old_fs);
431 return err;
432 }
433 case EXT4_IOC_MOVE_EXT:
434 case FITRIM:
435 break;
436 default:
437 return -ENOIOCTLCMD;
438 }
439 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
440}
441#endif