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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext4/ioctl.c
4 *
5 * Copyright (C) 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 */
10
11#include <linux/fs.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 <linux/quotaops.h>
18#include <linux/random.h>
19#include <linux/uaccess.h>
20#include <linux/delay.h>
21#include <linux/iversion.h>
22#include <linux/fileattr.h>
23#include <linux/uuid.h>
24#include "ext4_jbd2.h"
25#include "ext4.h"
26#include <linux/fsmap.h>
27#include "fsmap.h"
28#include <trace/events/ext4.h>
29
30typedef void ext4_update_sb_callback(struct ext4_super_block *es,
31 const void *arg);
32
33/*
34 * Superblock modification callback function for changing file system
35 * label
36 */
37static void ext4_sb_setlabel(struct ext4_super_block *es, const void *arg)
38{
39 /* Sanity check, this should never happen */
40 BUILD_BUG_ON(sizeof(es->s_volume_name) < EXT4_LABEL_MAX);
41
42 memcpy(es->s_volume_name, (char *)arg, EXT4_LABEL_MAX);
43}
44
45/*
46 * Superblock modification callback function for changing file system
47 * UUID.
48 */
49static void ext4_sb_setuuid(struct ext4_super_block *es, const void *arg)
50{
51 memcpy(es->s_uuid, (__u8 *)arg, UUID_SIZE);
52}
53
54static
55int ext4_update_primary_sb(struct super_block *sb, handle_t *handle,
56 ext4_update_sb_callback func,
57 const void *arg)
58{
59 int err = 0;
60 struct ext4_sb_info *sbi = EXT4_SB(sb);
61 struct buffer_head *bh = sbi->s_sbh;
62 struct ext4_super_block *es = sbi->s_es;
63
64 trace_ext4_update_sb(sb, bh->b_blocknr, 1);
65
66 BUFFER_TRACE(bh, "get_write_access");
67 err = ext4_journal_get_write_access(handle, sb,
68 bh,
69 EXT4_JTR_NONE);
70 if (err)
71 goto out_err;
72
73 lock_buffer(bh);
74 func(es, arg);
75 ext4_superblock_csum_set(sb);
76 unlock_buffer(bh);
77
78 if (buffer_write_io_error(bh) || !buffer_uptodate(bh)) {
79 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
80 "superblock detected");
81 clear_buffer_write_io_error(bh);
82 set_buffer_uptodate(bh);
83 }
84
85 err = ext4_handle_dirty_metadata(handle, NULL, bh);
86 if (err)
87 goto out_err;
88 err = sync_dirty_buffer(bh);
89out_err:
90 ext4_std_error(sb, err);
91 return err;
92}
93
94/*
95 * Update one backup superblock in the group 'grp' using the callback
96 * function 'func' and argument 'arg'. If the handle is NULL the
97 * modification is not journalled.
98 *
99 * Returns: 0 when no modification was done (no superblock in the group)
100 * 1 when the modification was successful
101 * <0 on error
102 */
103static int ext4_update_backup_sb(struct super_block *sb,
104 handle_t *handle, ext4_group_t grp,
105 ext4_update_sb_callback func, const void *arg)
106{
107 int err = 0;
108 ext4_fsblk_t sb_block;
109 struct buffer_head *bh;
110 unsigned long offset = 0;
111 struct ext4_super_block *es;
112
113 if (!ext4_bg_has_super(sb, grp))
114 return 0;
115
116 /*
117 * For the group 0 there is always 1k padding, so we have
118 * either adjust offset, or sb_block depending on blocksize
119 */
120 if (grp == 0) {
121 sb_block = 1 * EXT4_MIN_BLOCK_SIZE;
122 offset = do_div(sb_block, sb->s_blocksize);
123 } else {
124 sb_block = ext4_group_first_block_no(sb, grp);
125 offset = 0;
126 }
127
128 trace_ext4_update_sb(sb, sb_block, handle ? 1 : 0);
129
130 bh = ext4_sb_bread(sb, sb_block, 0);
131 if (IS_ERR(bh))
132 return PTR_ERR(bh);
133
134 if (handle) {
135 BUFFER_TRACE(bh, "get_write_access");
136 err = ext4_journal_get_write_access(handle, sb,
137 bh,
138 EXT4_JTR_NONE);
139 if (err)
140 goto out_bh;
141 }
142
143 es = (struct ext4_super_block *) (bh->b_data + offset);
144 lock_buffer(bh);
145 if (ext4_has_metadata_csum(sb) &&
146 es->s_checksum != ext4_superblock_csum(sb, es)) {
147 ext4_msg(sb, KERN_ERR, "Invalid checksum for backup "
148 "superblock %llu", sb_block);
149 unlock_buffer(bh);
150 goto out_bh;
151 }
152 func(es, arg);
153 if (ext4_has_metadata_csum(sb))
154 es->s_checksum = ext4_superblock_csum(sb, es);
155 set_buffer_uptodate(bh);
156 unlock_buffer(bh);
157
158 if (err)
159 goto out_bh;
160
161 if (handle) {
162 err = ext4_handle_dirty_metadata(handle, NULL, bh);
163 if (err)
164 goto out_bh;
165 } else {
166 BUFFER_TRACE(bh, "marking dirty");
167 mark_buffer_dirty(bh);
168 }
169 err = sync_dirty_buffer(bh);
170
171out_bh:
172 brelse(bh);
173 ext4_std_error(sb, err);
174 return (err) ? err : 1;
175}
176
177/*
178 * Update primary and backup superblocks using the provided function
179 * func and argument arg.
180 *
181 * Only the primary superblock and at most two backup superblock
182 * modifications are journalled; the rest is modified without journal.
183 * This is safe because e2fsck will re-write them if there is a problem,
184 * and we're very unlikely to ever need more than two backups.
185 */
186static
187int ext4_update_superblocks_fn(struct super_block *sb,
188 ext4_update_sb_callback func,
189 const void *arg)
190{
191 handle_t *handle;
192 ext4_group_t ngroups;
193 unsigned int three = 1;
194 unsigned int five = 5;
195 unsigned int seven = 7;
196 int err = 0, ret, i;
197 ext4_group_t grp, primary_grp;
198 struct ext4_sb_info *sbi = EXT4_SB(sb);
199
200 /*
201 * We can't update superblocks while the online resize is running
202 */
203 if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
204 &sbi->s_ext4_flags)) {
205 ext4_msg(sb, KERN_ERR, "Can't modify superblock while"
206 "performing online resize");
207 return -EBUSY;
208 }
209
210 /*
211 * We're only going to update primary superblock and two
212 * backup superblocks in this transaction.
213 */
214 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3);
215 if (IS_ERR(handle)) {
216 err = PTR_ERR(handle);
217 goto out;
218 }
219
220 /* Update primary superblock */
221 err = ext4_update_primary_sb(sb, handle, func, arg);
222 if (err) {
223 ext4_msg(sb, KERN_ERR, "Failed to update primary "
224 "superblock");
225 goto out_journal;
226 }
227
228 primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr);
229 ngroups = ext4_get_groups_count(sb);
230
231 /*
232 * Update backup superblocks. We have to start from group 0
233 * because it might not be where the primary superblock is
234 * if the fs is mounted with -o sb=<backup_sb_block>
235 */
236 i = 0;
237 grp = 0;
238 while (grp < ngroups) {
239 /* Skip primary superblock */
240 if (grp == primary_grp)
241 goto next_grp;
242
243 ret = ext4_update_backup_sb(sb, handle, grp, func, arg);
244 if (ret < 0) {
245 /* Ignore bad checksum; try to update next sb */
246 if (ret == -EFSBADCRC)
247 goto next_grp;
248 err = ret;
249 goto out_journal;
250 }
251
252 i += ret;
253 if (handle && i > 1) {
254 /*
255 * We're only journalling primary superblock and
256 * two backup superblocks; the rest is not
257 * journalled.
258 */
259 err = ext4_journal_stop(handle);
260 if (err)
261 goto out;
262 handle = NULL;
263 }
264next_grp:
265 grp = ext4_list_backups(sb, &three, &five, &seven);
266 }
267
268out_journal:
269 if (handle) {
270 ret = ext4_journal_stop(handle);
271 if (ret && !err)
272 err = ret;
273 }
274out:
275 clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags);
276 smp_mb__after_atomic();
277 return err ? err : 0;
278}
279
280/*
281 * Swap memory between @a and @b for @len bytes.
282 *
283 * @a: pointer to first memory area
284 * @b: pointer to second memory area
285 * @len: number of bytes to swap
286 *
287 */
288static void memswap(void *a, void *b, size_t len)
289{
290 unsigned char *ap, *bp;
291
292 ap = (unsigned char *)a;
293 bp = (unsigned char *)b;
294 while (len-- > 0) {
295 swap(*ap, *bp);
296 ap++;
297 bp++;
298 }
299}
300
301/*
302 * Swap i_data and associated attributes between @inode1 and @inode2.
303 * This function is used for the primary swap between inode1 and inode2
304 * and also to revert this primary swap in case of errors.
305 *
306 * Therefore you have to make sure, that calling this method twice
307 * will revert all changes.
308 *
309 * @inode1: pointer to first inode
310 * @inode2: pointer to second inode
311 */
312static void swap_inode_data(struct inode *inode1, struct inode *inode2)
313{
314 loff_t isize;
315 struct ext4_inode_info *ei1;
316 struct ext4_inode_info *ei2;
317 unsigned long tmp;
318
319 ei1 = EXT4_I(inode1);
320 ei2 = EXT4_I(inode2);
321
322 swap(inode1->i_version, inode2->i_version);
323 swap(inode1->i_atime, inode2->i_atime);
324 swap(inode1->i_mtime, inode2->i_mtime);
325
326 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
327 tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
328 ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
329 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
330 ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
331 swap(ei1->i_disksize, ei2->i_disksize);
332 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
333 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
334
335 isize = i_size_read(inode1);
336 i_size_write(inode1, i_size_read(inode2));
337 i_size_write(inode2, isize);
338}
339
340void ext4_reset_inode_seed(struct inode *inode)
341{
342 struct ext4_inode_info *ei = EXT4_I(inode);
343 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
344 __le32 inum = cpu_to_le32(inode->i_ino);
345 __le32 gen = cpu_to_le32(inode->i_generation);
346 __u32 csum;
347
348 if (!ext4_has_metadata_csum(inode->i_sb))
349 return;
350
351 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
352 ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
353}
354
355/*
356 * Swap the information from the given @inode and the inode
357 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
358 * important fields of the inodes.
359 *
360 * @sb: the super block of the filesystem
361 * @mnt_userns: user namespace of the mount the inode was found from
362 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
363 *
364 */
365static long swap_inode_boot_loader(struct super_block *sb,
366 struct user_namespace *mnt_userns,
367 struct inode *inode)
368{
369 handle_t *handle;
370 int err;
371 struct inode *inode_bl;
372 struct ext4_inode_info *ei_bl;
373 qsize_t size, size_bl, diff;
374 blkcnt_t blocks;
375 unsigned short bytes;
376
377 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO,
378 EXT4_IGET_SPECIAL | EXT4_IGET_BAD);
379 if (IS_ERR(inode_bl))
380 return PTR_ERR(inode_bl);
381 ei_bl = EXT4_I(inode_bl);
382
383 /* Protect orig inodes against a truncate and make sure,
384 * that only 1 swap_inode_boot_loader is running. */
385 lock_two_nondirectories(inode, inode_bl);
386
387 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
388 IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
389 (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
390 ext4_has_inline_data(inode)) {
391 err = -EINVAL;
392 goto journal_err_out;
393 }
394
395 if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
396 !inode_owner_or_capable(mnt_userns, inode) ||
397 !capable(CAP_SYS_ADMIN)) {
398 err = -EPERM;
399 goto journal_err_out;
400 }
401
402 filemap_invalidate_lock(inode->i_mapping);
403 err = filemap_write_and_wait(inode->i_mapping);
404 if (err)
405 goto err_out;
406
407 err = filemap_write_and_wait(inode_bl->i_mapping);
408 if (err)
409 goto err_out;
410
411 /* Wait for all existing dio workers */
412 inode_dio_wait(inode);
413 inode_dio_wait(inode_bl);
414
415 truncate_inode_pages(&inode->i_data, 0);
416 truncate_inode_pages(&inode_bl->i_data, 0);
417
418 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
419 if (IS_ERR(handle)) {
420 err = -EINVAL;
421 goto err_out;
422 }
423 ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle);
424
425 /* Protect extent tree against block allocations via delalloc */
426 ext4_double_down_write_data_sem(inode, inode_bl);
427
428 if (is_bad_inode(inode_bl) || !S_ISREG(inode_bl->i_mode)) {
429 /* this inode has never been used as a BOOT_LOADER */
430 set_nlink(inode_bl, 1);
431 i_uid_write(inode_bl, 0);
432 i_gid_write(inode_bl, 0);
433 inode_bl->i_flags = 0;
434 ei_bl->i_flags = 0;
435 inode_set_iversion(inode_bl, 1);
436 i_size_write(inode_bl, 0);
437 inode_bl->i_mode = S_IFREG;
438 if (ext4_has_feature_extents(sb)) {
439 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
440 ext4_ext_tree_init(handle, inode_bl);
441 } else
442 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
443 }
444
445 err = dquot_initialize(inode);
446 if (err)
447 goto err_out1;
448
449 size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
450 size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
451 diff = size - size_bl;
452 swap_inode_data(inode, inode_bl);
453
454 inode->i_ctime = inode_bl->i_ctime = current_time(inode);
455 inode_inc_iversion(inode);
456
457 inode->i_generation = get_random_u32();
458 inode_bl->i_generation = get_random_u32();
459 ext4_reset_inode_seed(inode);
460 ext4_reset_inode_seed(inode_bl);
461
462 ext4_discard_preallocations(inode, 0);
463
464 err = ext4_mark_inode_dirty(handle, inode);
465 if (err < 0) {
466 /* No need to update quota information. */
467 ext4_warning(inode->i_sb,
468 "couldn't mark inode #%lu dirty (err %d)",
469 inode->i_ino, err);
470 /* Revert all changes: */
471 swap_inode_data(inode, inode_bl);
472 ext4_mark_inode_dirty(handle, inode);
473 goto err_out1;
474 }
475
476 blocks = inode_bl->i_blocks;
477 bytes = inode_bl->i_bytes;
478 inode_bl->i_blocks = inode->i_blocks;
479 inode_bl->i_bytes = inode->i_bytes;
480 err = ext4_mark_inode_dirty(handle, inode_bl);
481 if (err < 0) {
482 /* No need to update quota information. */
483 ext4_warning(inode_bl->i_sb,
484 "couldn't mark inode #%lu dirty (err %d)",
485 inode_bl->i_ino, err);
486 goto revert;
487 }
488
489 /* Bootloader inode should not be counted into quota information. */
490 if (diff > 0)
491 dquot_free_space(inode, diff);
492 else
493 err = dquot_alloc_space(inode, -1 * diff);
494
495 if (err < 0) {
496revert:
497 /* Revert all changes: */
498 inode_bl->i_blocks = blocks;
499 inode_bl->i_bytes = bytes;
500 swap_inode_data(inode, inode_bl);
501 ext4_mark_inode_dirty(handle, inode);
502 ext4_mark_inode_dirty(handle, inode_bl);
503 }
504
505err_out1:
506 ext4_journal_stop(handle);
507 ext4_double_up_write_data_sem(inode, inode_bl);
508
509err_out:
510 filemap_invalidate_unlock(inode->i_mapping);
511journal_err_out:
512 unlock_two_nondirectories(inode, inode_bl);
513 iput(inode_bl);
514 return err;
515}
516
517/*
518 * If immutable is set and we are not clearing it, we're not allowed to change
519 * anything else in the inode. Don't error out if we're only trying to set
520 * immutable on an immutable file.
521 */
522static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
523 unsigned int flags)
524{
525 struct ext4_inode_info *ei = EXT4_I(inode);
526 unsigned int oldflags = ei->i_flags;
527
528 if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
529 return 0;
530
531 if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
532 return -EPERM;
533 if (ext4_has_feature_project(inode->i_sb) &&
534 __kprojid_val(ei->i_projid) != new_projid)
535 return -EPERM;
536
537 return 0;
538}
539
540static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
541{
542 struct ext4_inode_info *ei = EXT4_I(inode);
543
544 if (S_ISDIR(inode->i_mode))
545 return;
546
547 if (test_opt2(inode->i_sb, DAX_NEVER) ||
548 test_opt(inode->i_sb, DAX_ALWAYS))
549 return;
550
551 if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
552 d_mark_dontcache(inode);
553}
554
555static bool dax_compatible(struct inode *inode, unsigned int oldflags,
556 unsigned int flags)
557{
558 /* Allow the DAX flag to be changed on inline directories */
559 if (S_ISDIR(inode->i_mode)) {
560 flags &= ~EXT4_INLINE_DATA_FL;
561 oldflags &= ~EXT4_INLINE_DATA_FL;
562 }
563
564 if (flags & EXT4_DAX_FL) {
565 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
566 ext4_test_inode_state(inode,
567 EXT4_STATE_VERITY_IN_PROGRESS)) {
568 return false;
569 }
570 }
571
572 if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
573 return false;
574
575 return true;
576}
577
578static int ext4_ioctl_setflags(struct inode *inode,
579 unsigned int flags)
580{
581 struct ext4_inode_info *ei = EXT4_I(inode);
582 handle_t *handle = NULL;
583 int err = -EPERM, migrate = 0;
584 struct ext4_iloc iloc;
585 unsigned int oldflags, mask, i;
586 struct super_block *sb = inode->i_sb;
587
588 /* Is it quota file? Do not allow user to mess with it */
589 if (ext4_is_quota_file(inode))
590 goto flags_out;
591
592 oldflags = ei->i_flags;
593 /*
594 * The JOURNAL_DATA flag can only be changed by
595 * the relevant capability.
596 */
597 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
598 if (!capable(CAP_SYS_RESOURCE))
599 goto flags_out;
600 }
601
602 if (!dax_compatible(inode, oldflags, flags)) {
603 err = -EOPNOTSUPP;
604 goto flags_out;
605 }
606
607 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
608 migrate = 1;
609
610 if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
611 if (!ext4_has_feature_casefold(sb)) {
612 err = -EOPNOTSUPP;
613 goto flags_out;
614 }
615
616 if (!S_ISDIR(inode->i_mode)) {
617 err = -ENOTDIR;
618 goto flags_out;
619 }
620
621 if (!ext4_empty_dir(inode)) {
622 err = -ENOTEMPTY;
623 goto flags_out;
624 }
625 }
626
627 /*
628 * Wait for all pending directio and then flush all the dirty pages
629 * for this file. The flush marks all the pages readonly, so any
630 * subsequent attempt to write to the file (particularly mmap pages)
631 * will come through the filesystem and fail.
632 */
633 if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
634 (flags & EXT4_IMMUTABLE_FL)) {
635 inode_dio_wait(inode);
636 err = filemap_write_and_wait(inode->i_mapping);
637 if (err)
638 goto flags_out;
639 }
640
641 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
642 if (IS_ERR(handle)) {
643 err = PTR_ERR(handle);
644 goto flags_out;
645 }
646 if (IS_SYNC(inode))
647 ext4_handle_sync(handle);
648 err = ext4_reserve_inode_write(handle, inode, &iloc);
649 if (err)
650 goto flags_err;
651
652 ext4_dax_dontcache(inode, flags);
653
654 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
655 if (!(mask & EXT4_FL_USER_MODIFIABLE))
656 continue;
657 /* These flags get special treatment later */
658 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
659 continue;
660 if (mask & flags)
661 ext4_set_inode_flag(inode, i);
662 else
663 ext4_clear_inode_flag(inode, i);
664 }
665
666 ext4_set_inode_flags(inode, false);
667
668 inode->i_ctime = current_time(inode);
669 inode_inc_iversion(inode);
670
671 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
672flags_err:
673 ext4_journal_stop(handle);
674 if (err)
675 goto flags_out;
676
677 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
678 /*
679 * Changes to the journaling mode can cause unsafe changes to
680 * S_DAX if the inode is DAX
681 */
682 if (IS_DAX(inode)) {
683 err = -EBUSY;
684 goto flags_out;
685 }
686
687 err = ext4_change_inode_journal_flag(inode,
688 flags & EXT4_JOURNAL_DATA_FL);
689 if (err)
690 goto flags_out;
691 }
692 if (migrate) {
693 if (flags & EXT4_EXTENTS_FL)
694 err = ext4_ext_migrate(inode);
695 else
696 err = ext4_ind_migrate(inode);
697 }
698
699flags_out:
700 return err;
701}
702
703#ifdef CONFIG_QUOTA
704static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
705{
706 struct super_block *sb = inode->i_sb;
707 struct ext4_inode_info *ei = EXT4_I(inode);
708 int err, rc;
709 handle_t *handle;
710 kprojid_t kprojid;
711 struct ext4_iloc iloc;
712 struct ext4_inode *raw_inode;
713 struct dquot *transfer_to[MAXQUOTAS] = { };
714
715 if (!ext4_has_feature_project(sb)) {
716 if (projid != EXT4_DEF_PROJID)
717 return -EOPNOTSUPP;
718 else
719 return 0;
720 }
721
722 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
723 return -EOPNOTSUPP;
724
725 kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
726
727 if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
728 return 0;
729
730 err = -EPERM;
731 /* Is it quota file? Do not allow user to mess with it */
732 if (ext4_is_quota_file(inode))
733 return err;
734
735 err = dquot_initialize(inode);
736 if (err)
737 return err;
738
739 err = ext4_get_inode_loc(inode, &iloc);
740 if (err)
741 return err;
742
743 raw_inode = ext4_raw_inode(&iloc);
744 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
745 err = ext4_expand_extra_isize(inode,
746 EXT4_SB(sb)->s_want_extra_isize,
747 &iloc);
748 if (err)
749 return err;
750 } else {
751 brelse(iloc.bh);
752 }
753
754 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
755 EXT4_QUOTA_INIT_BLOCKS(sb) +
756 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
757 if (IS_ERR(handle))
758 return PTR_ERR(handle);
759
760 err = ext4_reserve_inode_write(handle, inode, &iloc);
761 if (err)
762 goto out_stop;
763
764 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
765 if (!IS_ERR(transfer_to[PRJQUOTA])) {
766
767 /* __dquot_transfer() calls back ext4_get_inode_usage() which
768 * counts xattr inode references.
769 */
770 down_read(&EXT4_I(inode)->xattr_sem);
771 err = __dquot_transfer(inode, transfer_to);
772 up_read(&EXT4_I(inode)->xattr_sem);
773 dqput(transfer_to[PRJQUOTA]);
774 if (err)
775 goto out_dirty;
776 }
777
778 EXT4_I(inode)->i_projid = kprojid;
779 inode->i_ctime = current_time(inode);
780 inode_inc_iversion(inode);
781out_dirty:
782 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
783 if (!err)
784 err = rc;
785out_stop:
786 ext4_journal_stop(handle);
787 return err;
788}
789#else
790static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
791{
792 if (projid != EXT4_DEF_PROJID)
793 return -EOPNOTSUPP;
794 return 0;
795}
796#endif
797
798static int ext4_shutdown(struct super_block *sb, unsigned long arg)
799{
800 struct ext4_sb_info *sbi = EXT4_SB(sb);
801 __u32 flags;
802
803 if (!capable(CAP_SYS_ADMIN))
804 return -EPERM;
805
806 if (get_user(flags, (__u32 __user *)arg))
807 return -EFAULT;
808
809 if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
810 return -EINVAL;
811
812 if (ext4_forced_shutdown(sbi))
813 return 0;
814
815 ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
816 trace_ext4_shutdown(sb, flags);
817
818 switch (flags) {
819 case EXT4_GOING_FLAGS_DEFAULT:
820 freeze_bdev(sb->s_bdev);
821 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
822 thaw_bdev(sb->s_bdev);
823 break;
824 case EXT4_GOING_FLAGS_LOGFLUSH:
825 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
826 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
827 (void) ext4_force_commit(sb);
828 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
829 }
830 break;
831 case EXT4_GOING_FLAGS_NOLOGFLUSH:
832 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
833 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
834 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
835 break;
836 default:
837 return -EINVAL;
838 }
839 clear_opt(sb, DISCARD);
840 return 0;
841}
842
843struct getfsmap_info {
844 struct super_block *gi_sb;
845 struct fsmap_head __user *gi_data;
846 unsigned int gi_idx;
847 __u32 gi_last_flags;
848};
849
850static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
851{
852 struct getfsmap_info *info = priv;
853 struct fsmap fm;
854
855 trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
856
857 info->gi_last_flags = xfm->fmr_flags;
858 ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
859 if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
860 sizeof(struct fsmap)))
861 return -EFAULT;
862
863 return 0;
864}
865
866static int ext4_ioc_getfsmap(struct super_block *sb,
867 struct fsmap_head __user *arg)
868{
869 struct getfsmap_info info = { NULL };
870 struct ext4_fsmap_head xhead = {0};
871 struct fsmap_head head;
872 bool aborted = false;
873 int error;
874
875 if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
876 return -EFAULT;
877 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
878 memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
879 sizeof(head.fmh_keys[0].fmr_reserved)) ||
880 memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
881 sizeof(head.fmh_keys[1].fmr_reserved)))
882 return -EINVAL;
883 /*
884 * ext4 doesn't report file extents at all, so the only valid
885 * file offsets are the magic ones (all zeroes or all ones).
886 */
887 if (head.fmh_keys[0].fmr_offset ||
888 (head.fmh_keys[1].fmr_offset != 0 &&
889 head.fmh_keys[1].fmr_offset != -1ULL))
890 return -EINVAL;
891
892 xhead.fmh_iflags = head.fmh_iflags;
893 xhead.fmh_count = head.fmh_count;
894 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
895 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
896
897 trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
898 trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
899
900 info.gi_sb = sb;
901 info.gi_data = arg;
902 error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
903 if (error == EXT4_QUERY_RANGE_ABORT)
904 aborted = true;
905 else if (error)
906 return error;
907
908 /* If we didn't abort, set the "last" flag in the last fmx */
909 if (!aborted && info.gi_idx) {
910 info.gi_last_flags |= FMR_OF_LAST;
911 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
912 &info.gi_last_flags,
913 sizeof(info.gi_last_flags)))
914 return -EFAULT;
915 }
916
917 /* copy back header */
918 head.fmh_entries = xhead.fmh_entries;
919 head.fmh_oflags = xhead.fmh_oflags;
920 if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
921 return -EFAULT;
922
923 return 0;
924}
925
926static long ext4_ioctl_group_add(struct file *file,
927 struct ext4_new_group_data *input)
928{
929 struct super_block *sb = file_inode(file)->i_sb;
930 int err, err2=0;
931
932 err = ext4_resize_begin(sb);
933 if (err)
934 return err;
935
936 if (ext4_has_feature_bigalloc(sb)) {
937 ext4_msg(sb, KERN_ERR,
938 "Online resizing not supported with bigalloc");
939 err = -EOPNOTSUPP;
940 goto group_add_out;
941 }
942
943 err = mnt_want_write_file(file);
944 if (err)
945 goto group_add_out;
946
947 err = ext4_group_add(sb, input);
948 if (EXT4_SB(sb)->s_journal) {
949 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
950 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
951 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
952 }
953 if (err == 0)
954 err = err2;
955 mnt_drop_write_file(file);
956 if (!err && ext4_has_group_desc_csum(sb) &&
957 test_opt(sb, INIT_INODE_TABLE))
958 err = ext4_register_li_request(sb, input->group);
959group_add_out:
960 err2 = ext4_resize_end(sb, false);
961 if (err == 0)
962 err = err2;
963 return err;
964}
965
966int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
967{
968 struct inode *inode = d_inode(dentry);
969 struct ext4_inode_info *ei = EXT4_I(inode);
970 u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
971
972 if (S_ISREG(inode->i_mode))
973 flags &= ~FS_PROJINHERIT_FL;
974
975 fileattr_fill_flags(fa, flags);
976 if (ext4_has_feature_project(inode->i_sb))
977 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
978
979 return 0;
980}
981
982int ext4_fileattr_set(struct user_namespace *mnt_userns,
983 struct dentry *dentry, struct fileattr *fa)
984{
985 struct inode *inode = d_inode(dentry);
986 u32 flags = fa->flags;
987 int err = -EOPNOTSUPP;
988
989 if (flags & ~EXT4_FL_USER_VISIBLE)
990 goto out;
991
992 /*
993 * chattr(1) grabs flags via GETFLAGS, modifies the result and
994 * passes that to SETFLAGS. So we cannot easily make SETFLAGS
995 * more restrictive than just silently masking off visible but
996 * not settable flags as we always did.
997 */
998 flags &= EXT4_FL_USER_MODIFIABLE;
999 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1000 goto out;
1001 err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
1002 if (err)
1003 goto out;
1004 err = ext4_ioctl_setflags(inode, flags);
1005 if (err)
1006 goto out;
1007 err = ext4_ioctl_setproject(inode, fa->fsx_projid);
1008out:
1009 return err;
1010}
1011
1012/* So that the fiemap access checks can't overflow on 32 bit machines. */
1013#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
1014
1015static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
1016{
1017 struct fiemap fiemap;
1018 struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
1019 struct fiemap_extent_info fieinfo = { 0, };
1020 struct inode *inode = file_inode(filp);
1021 int error;
1022
1023 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
1024 return -EFAULT;
1025
1026 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
1027 return -EINVAL;
1028
1029 fieinfo.fi_flags = fiemap.fm_flags;
1030 fieinfo.fi_extents_max = fiemap.fm_extent_count;
1031 fieinfo.fi_extents_start = ufiemap->fm_extents;
1032
1033 error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
1034 fiemap.fm_length);
1035 fiemap.fm_flags = fieinfo.fi_flags;
1036 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
1037 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
1038 error = -EFAULT;
1039
1040 return error;
1041}
1042
1043static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
1044{
1045 int err = 0;
1046 __u32 flags = 0;
1047 unsigned int flush_flags = 0;
1048 struct super_block *sb = file_inode(filp)->i_sb;
1049
1050 if (copy_from_user(&flags, (__u32 __user *)arg,
1051 sizeof(__u32)))
1052 return -EFAULT;
1053
1054 if (!capable(CAP_SYS_ADMIN))
1055 return -EPERM;
1056
1057 /* check for invalid bits set */
1058 if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
1059 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1060 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
1061 return -EINVAL;
1062
1063 if (!EXT4_SB(sb)->s_journal)
1064 return -ENODEV;
1065
1066 if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1067 !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
1068 return -EOPNOTSUPP;
1069
1070 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
1071 return 0;
1072
1073 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD)
1074 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD;
1075
1076 if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) {
1077 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT;
1078 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow");
1079 }
1080
1081 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1082 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags);
1083 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1084
1085 return err;
1086}
1087
1088static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label)
1089{
1090 size_t len;
1091 int ret = 0;
1092 char new_label[EXT4_LABEL_MAX + 1];
1093 struct super_block *sb = file_inode(filp)->i_sb;
1094
1095 if (!capable(CAP_SYS_ADMIN))
1096 return -EPERM;
1097
1098 /*
1099 * Copy the maximum length allowed for ext4 label with one more to
1100 * find the required terminating null byte in order to test the
1101 * label length. The on disk label doesn't need to be null terminated.
1102 */
1103 if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1))
1104 return -EFAULT;
1105
1106 len = strnlen(new_label, EXT4_LABEL_MAX + 1);
1107 if (len > EXT4_LABEL_MAX)
1108 return -EINVAL;
1109
1110 /*
1111 * Clear the buffer after the new label
1112 */
1113 memset(new_label + len, 0, EXT4_LABEL_MAX - len);
1114
1115 ret = mnt_want_write_file(filp);
1116 if (ret)
1117 return ret;
1118
1119 ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label);
1120
1121 mnt_drop_write_file(filp);
1122 return ret;
1123}
1124
1125static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label)
1126{
1127 char label[EXT4_LABEL_MAX + 1];
1128
1129 /*
1130 * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because
1131 * FSLABEL_MAX must include terminating null byte, while s_volume_name
1132 * does not have to.
1133 */
1134 BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX);
1135
1136 memset(label, 0, sizeof(label));
1137 lock_buffer(sbi->s_sbh);
1138 strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX);
1139 unlock_buffer(sbi->s_sbh);
1140
1141 if (copy_to_user(user_label, label, sizeof(label)))
1142 return -EFAULT;
1143 return 0;
1144}
1145
1146static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi,
1147 struct fsuuid __user *ufsuuid)
1148{
1149 struct fsuuid fsuuid;
1150 __u8 uuid[UUID_SIZE];
1151
1152 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1153 return -EFAULT;
1154
1155 if (fsuuid.fsu_len == 0) {
1156 fsuuid.fsu_len = UUID_SIZE;
1157 if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len,
1158 sizeof(fsuuid.fsu_len)))
1159 return -EFAULT;
1160 return 0;
1161 }
1162
1163 if (fsuuid.fsu_len < UUID_SIZE || fsuuid.fsu_flags != 0)
1164 return -EINVAL;
1165
1166 lock_buffer(sbi->s_sbh);
1167 memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE);
1168 unlock_buffer(sbi->s_sbh);
1169
1170 fsuuid.fsu_len = UUID_SIZE;
1171 if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid)) ||
1172 copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE))
1173 return -EFAULT;
1174 return 0;
1175}
1176
1177static int ext4_ioctl_setuuid(struct file *filp,
1178 const struct fsuuid __user *ufsuuid)
1179{
1180 int ret = 0;
1181 struct super_block *sb = file_inode(filp)->i_sb;
1182 struct fsuuid fsuuid;
1183 __u8 uuid[UUID_SIZE];
1184
1185 if (!capable(CAP_SYS_ADMIN))
1186 return -EPERM;
1187
1188 /*
1189 * If any checksums (group descriptors or metadata) are being used
1190 * then the checksum seed feature is required to change the UUID.
1191 */
1192 if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb))
1193 && !ext4_has_feature_csum_seed(sb))
1194 || ext4_has_feature_stable_inodes(sb))
1195 return -EOPNOTSUPP;
1196
1197 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1198 return -EFAULT;
1199
1200 if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
1201 return -EINVAL;
1202
1203 if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE))
1204 return -EFAULT;
1205
1206 ret = mnt_want_write_file(filp);
1207 if (ret)
1208 return ret;
1209
1210 ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid);
1211 mnt_drop_write_file(filp);
1212
1213 return ret;
1214}
1215
1216static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1217{
1218 struct inode *inode = file_inode(filp);
1219 struct super_block *sb = inode->i_sb;
1220 struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
1221
1222 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
1223
1224 switch (cmd) {
1225 case FS_IOC_GETFSMAP:
1226 return ext4_ioc_getfsmap(sb, (void __user *)arg);
1227 case EXT4_IOC_GETVERSION:
1228 case EXT4_IOC_GETVERSION_OLD:
1229 return put_user(inode->i_generation, (int __user *) arg);
1230 case EXT4_IOC_SETVERSION:
1231 case EXT4_IOC_SETVERSION_OLD: {
1232 handle_t *handle;
1233 struct ext4_iloc iloc;
1234 __u32 generation;
1235 int err;
1236
1237 if (!inode_owner_or_capable(mnt_userns, inode))
1238 return -EPERM;
1239
1240 if (ext4_has_metadata_csum(inode->i_sb)) {
1241 ext4_warning(sb, "Setting inode version is not "
1242 "supported with metadata_csum enabled.");
1243 return -ENOTTY;
1244 }
1245
1246 err = mnt_want_write_file(filp);
1247 if (err)
1248 return err;
1249 if (get_user(generation, (int __user *) arg)) {
1250 err = -EFAULT;
1251 goto setversion_out;
1252 }
1253
1254 inode_lock(inode);
1255 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
1256 if (IS_ERR(handle)) {
1257 err = PTR_ERR(handle);
1258 goto unlock_out;
1259 }
1260 err = ext4_reserve_inode_write(handle, inode, &iloc);
1261 if (err == 0) {
1262 inode->i_ctime = current_time(inode);
1263 inode_inc_iversion(inode);
1264 inode->i_generation = generation;
1265 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
1266 }
1267 ext4_journal_stop(handle);
1268
1269unlock_out:
1270 inode_unlock(inode);
1271setversion_out:
1272 mnt_drop_write_file(filp);
1273 return err;
1274 }
1275 case EXT4_IOC_GROUP_EXTEND: {
1276 ext4_fsblk_t n_blocks_count;
1277 int err, err2=0;
1278
1279 err = ext4_resize_begin(sb);
1280 if (err)
1281 return err;
1282
1283 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
1284 err = -EFAULT;
1285 goto group_extend_out;
1286 }
1287
1288 if (ext4_has_feature_bigalloc(sb)) {
1289 ext4_msg(sb, KERN_ERR,
1290 "Online resizing not supported with bigalloc");
1291 err = -EOPNOTSUPP;
1292 goto group_extend_out;
1293 }
1294
1295 err = mnt_want_write_file(filp);
1296 if (err)
1297 goto group_extend_out;
1298
1299 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
1300 if (EXT4_SB(sb)->s_journal) {
1301 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1302 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1303 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1304 }
1305 if (err == 0)
1306 err = err2;
1307 mnt_drop_write_file(filp);
1308group_extend_out:
1309 err2 = ext4_resize_end(sb, false);
1310 if (err == 0)
1311 err = err2;
1312 return err;
1313 }
1314
1315 case EXT4_IOC_MOVE_EXT: {
1316 struct move_extent me;
1317 struct fd donor;
1318 int err;
1319
1320 if (!(filp->f_mode & FMODE_READ) ||
1321 !(filp->f_mode & FMODE_WRITE))
1322 return -EBADF;
1323
1324 if (copy_from_user(&me,
1325 (struct move_extent __user *)arg, sizeof(me)))
1326 return -EFAULT;
1327 me.moved_len = 0;
1328
1329 donor = fdget(me.donor_fd);
1330 if (!donor.file)
1331 return -EBADF;
1332
1333 if (!(donor.file->f_mode & FMODE_WRITE)) {
1334 err = -EBADF;
1335 goto mext_out;
1336 }
1337
1338 if (ext4_has_feature_bigalloc(sb)) {
1339 ext4_msg(sb, KERN_ERR,
1340 "Online defrag not supported with bigalloc");
1341 err = -EOPNOTSUPP;
1342 goto mext_out;
1343 } else if (IS_DAX(inode)) {
1344 ext4_msg(sb, KERN_ERR,
1345 "Online defrag not supported with DAX");
1346 err = -EOPNOTSUPP;
1347 goto mext_out;
1348 }
1349
1350 err = mnt_want_write_file(filp);
1351 if (err)
1352 goto mext_out;
1353
1354 err = ext4_move_extents(filp, donor.file, me.orig_start,
1355 me.donor_start, me.len, &me.moved_len);
1356 mnt_drop_write_file(filp);
1357
1358 if (copy_to_user((struct move_extent __user *)arg,
1359 &me, sizeof(me)))
1360 err = -EFAULT;
1361mext_out:
1362 fdput(donor);
1363 return err;
1364 }
1365
1366 case EXT4_IOC_GROUP_ADD: {
1367 struct ext4_new_group_data input;
1368
1369 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1370 sizeof(input)))
1371 return -EFAULT;
1372
1373 return ext4_ioctl_group_add(filp, &input);
1374 }
1375
1376 case EXT4_IOC_MIGRATE:
1377 {
1378 int err;
1379 if (!inode_owner_or_capable(mnt_userns, inode))
1380 return -EACCES;
1381
1382 err = mnt_want_write_file(filp);
1383 if (err)
1384 return err;
1385 /*
1386 * inode_mutex prevent write and truncate on the file.
1387 * Read still goes through. We take i_data_sem in
1388 * ext4_ext_swap_inode_data before we switch the
1389 * inode format to prevent read.
1390 */
1391 inode_lock((inode));
1392 err = ext4_ext_migrate(inode);
1393 inode_unlock((inode));
1394 mnt_drop_write_file(filp);
1395 return err;
1396 }
1397
1398 case EXT4_IOC_ALLOC_DA_BLKS:
1399 {
1400 int err;
1401 if (!inode_owner_or_capable(mnt_userns, inode))
1402 return -EACCES;
1403
1404 err = mnt_want_write_file(filp);
1405 if (err)
1406 return err;
1407 err = ext4_alloc_da_blocks(inode);
1408 mnt_drop_write_file(filp);
1409 return err;
1410 }
1411
1412 case EXT4_IOC_SWAP_BOOT:
1413 {
1414 int err;
1415 if (!(filp->f_mode & FMODE_WRITE))
1416 return -EBADF;
1417 err = mnt_want_write_file(filp);
1418 if (err)
1419 return err;
1420 err = swap_inode_boot_loader(sb, mnt_userns, inode);
1421 mnt_drop_write_file(filp);
1422 return err;
1423 }
1424
1425 case EXT4_IOC_RESIZE_FS: {
1426 ext4_fsblk_t n_blocks_count;
1427 int err = 0, err2 = 0;
1428 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1429
1430 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1431 sizeof(__u64))) {
1432 return -EFAULT;
1433 }
1434
1435 err = ext4_resize_begin(sb);
1436 if (err)
1437 return err;
1438
1439 err = mnt_want_write_file(filp);
1440 if (err)
1441 goto resizefs_out;
1442
1443 err = ext4_resize_fs(sb, n_blocks_count);
1444 if (EXT4_SB(sb)->s_journal) {
1445 ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL);
1446 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1447 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1448 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1449 }
1450 if (err == 0)
1451 err = err2;
1452 mnt_drop_write_file(filp);
1453 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1454 ext4_has_group_desc_csum(sb) &&
1455 test_opt(sb, INIT_INODE_TABLE))
1456 err = ext4_register_li_request(sb, o_group);
1457
1458resizefs_out:
1459 err2 = ext4_resize_end(sb, true);
1460 if (err == 0)
1461 err = err2;
1462 return err;
1463 }
1464
1465 case FITRIM:
1466 {
1467 struct fstrim_range range;
1468 int ret = 0;
1469
1470 if (!capable(CAP_SYS_ADMIN))
1471 return -EPERM;
1472
1473 if (!bdev_max_discard_sectors(sb->s_bdev))
1474 return -EOPNOTSUPP;
1475
1476 /*
1477 * We haven't replayed the journal, so we cannot use our
1478 * block-bitmap-guided storage zapping commands.
1479 */
1480 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1481 return -EROFS;
1482
1483 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1484 sizeof(range)))
1485 return -EFAULT;
1486
1487 ret = ext4_trim_fs(sb, &range);
1488 if (ret < 0)
1489 return ret;
1490
1491 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1492 sizeof(range)))
1493 return -EFAULT;
1494
1495 return 0;
1496 }
1497 case EXT4_IOC_PRECACHE_EXTENTS:
1498 return ext4_ext_precache(inode);
1499
1500 case FS_IOC_SET_ENCRYPTION_POLICY:
1501 if (!ext4_has_feature_encrypt(sb))
1502 return -EOPNOTSUPP;
1503 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1504
1505 case FS_IOC_GET_ENCRYPTION_PWSALT:
1506 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg);
1507
1508 case FS_IOC_GET_ENCRYPTION_POLICY:
1509 if (!ext4_has_feature_encrypt(sb))
1510 return -EOPNOTSUPP;
1511 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1512
1513 case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1514 if (!ext4_has_feature_encrypt(sb))
1515 return -EOPNOTSUPP;
1516 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1517
1518 case FS_IOC_ADD_ENCRYPTION_KEY:
1519 if (!ext4_has_feature_encrypt(sb))
1520 return -EOPNOTSUPP;
1521 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1522
1523 case FS_IOC_REMOVE_ENCRYPTION_KEY:
1524 if (!ext4_has_feature_encrypt(sb))
1525 return -EOPNOTSUPP;
1526 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1527
1528 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1529 if (!ext4_has_feature_encrypt(sb))
1530 return -EOPNOTSUPP;
1531 return fscrypt_ioctl_remove_key_all_users(filp,
1532 (void __user *)arg);
1533 case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1534 if (!ext4_has_feature_encrypt(sb))
1535 return -EOPNOTSUPP;
1536 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1537
1538 case FS_IOC_GET_ENCRYPTION_NONCE:
1539 if (!ext4_has_feature_encrypt(sb))
1540 return -EOPNOTSUPP;
1541 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1542
1543 case EXT4_IOC_CLEAR_ES_CACHE:
1544 {
1545 if (!inode_owner_or_capable(mnt_userns, inode))
1546 return -EACCES;
1547 ext4_clear_inode_es(inode);
1548 return 0;
1549 }
1550
1551 case EXT4_IOC_GETSTATE:
1552 {
1553 __u32 state = 0;
1554
1555 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1556 state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1557 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1558 state |= EXT4_STATE_FLAG_NEW;
1559 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1560 state |= EXT4_STATE_FLAG_NEWENTRY;
1561 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1562 state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1563
1564 return put_user(state, (__u32 __user *) arg);
1565 }
1566
1567 case EXT4_IOC_GET_ES_CACHE:
1568 return ext4_ioctl_get_es_cache(filp, arg);
1569
1570 case EXT4_IOC_SHUTDOWN:
1571 return ext4_shutdown(sb, arg);
1572
1573 case FS_IOC_ENABLE_VERITY:
1574 if (!ext4_has_feature_verity(sb))
1575 return -EOPNOTSUPP;
1576 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1577
1578 case FS_IOC_MEASURE_VERITY:
1579 if (!ext4_has_feature_verity(sb))
1580 return -EOPNOTSUPP;
1581 return fsverity_ioctl_measure(filp, (void __user *)arg);
1582
1583 case FS_IOC_READ_VERITY_METADATA:
1584 if (!ext4_has_feature_verity(sb))
1585 return -EOPNOTSUPP;
1586 return fsverity_ioctl_read_metadata(filp,
1587 (const void __user *)arg);
1588
1589 case EXT4_IOC_CHECKPOINT:
1590 return ext4_ioctl_checkpoint(filp, arg);
1591
1592 case FS_IOC_GETFSLABEL:
1593 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg);
1594
1595 case FS_IOC_SETFSLABEL:
1596 return ext4_ioctl_setlabel(filp,
1597 (const void __user *)arg);
1598
1599 case EXT4_IOC_GETFSUUID:
1600 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg);
1601 case EXT4_IOC_SETFSUUID:
1602 return ext4_ioctl_setuuid(filp, (const void __user *)arg);
1603 default:
1604 return -ENOTTY;
1605 }
1606}
1607
1608long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1609{
1610 return __ext4_ioctl(filp, cmd, arg);
1611}
1612
1613#ifdef CONFIG_COMPAT
1614long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1615{
1616 /* These are just misnamed, they actually get/put from/to user an int */
1617 switch (cmd) {
1618 case EXT4_IOC32_GETVERSION:
1619 cmd = EXT4_IOC_GETVERSION;
1620 break;
1621 case EXT4_IOC32_SETVERSION:
1622 cmd = EXT4_IOC_SETVERSION;
1623 break;
1624 case EXT4_IOC32_GROUP_EXTEND:
1625 cmd = EXT4_IOC_GROUP_EXTEND;
1626 break;
1627 case EXT4_IOC32_GETVERSION_OLD:
1628 cmd = EXT4_IOC_GETVERSION_OLD;
1629 break;
1630 case EXT4_IOC32_SETVERSION_OLD:
1631 cmd = EXT4_IOC_SETVERSION_OLD;
1632 break;
1633 case EXT4_IOC32_GETRSVSZ:
1634 cmd = EXT4_IOC_GETRSVSZ;
1635 break;
1636 case EXT4_IOC32_SETRSVSZ:
1637 cmd = EXT4_IOC_SETRSVSZ;
1638 break;
1639 case EXT4_IOC32_GROUP_ADD: {
1640 struct compat_ext4_new_group_input __user *uinput;
1641 struct ext4_new_group_data input;
1642 int err;
1643
1644 uinput = compat_ptr(arg);
1645 err = get_user(input.group, &uinput->group);
1646 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1647 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1648 err |= get_user(input.inode_table, &uinput->inode_table);
1649 err |= get_user(input.blocks_count, &uinput->blocks_count);
1650 err |= get_user(input.reserved_blocks,
1651 &uinput->reserved_blocks);
1652 if (err)
1653 return -EFAULT;
1654 return ext4_ioctl_group_add(file, &input);
1655 }
1656 case EXT4_IOC_MOVE_EXT:
1657 case EXT4_IOC_RESIZE_FS:
1658 case FITRIM:
1659 case EXT4_IOC_PRECACHE_EXTENTS:
1660 case FS_IOC_SET_ENCRYPTION_POLICY:
1661 case FS_IOC_GET_ENCRYPTION_PWSALT:
1662 case FS_IOC_GET_ENCRYPTION_POLICY:
1663 case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1664 case FS_IOC_ADD_ENCRYPTION_KEY:
1665 case FS_IOC_REMOVE_ENCRYPTION_KEY:
1666 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1667 case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1668 case FS_IOC_GET_ENCRYPTION_NONCE:
1669 case EXT4_IOC_SHUTDOWN:
1670 case FS_IOC_GETFSMAP:
1671 case FS_IOC_ENABLE_VERITY:
1672 case FS_IOC_MEASURE_VERITY:
1673 case FS_IOC_READ_VERITY_METADATA:
1674 case EXT4_IOC_CLEAR_ES_CACHE:
1675 case EXT4_IOC_GETSTATE:
1676 case EXT4_IOC_GET_ES_CACHE:
1677 case EXT4_IOC_CHECKPOINT:
1678 case FS_IOC_GETFSLABEL:
1679 case FS_IOC_SETFSLABEL:
1680 case EXT4_IOC_GETFSUUID:
1681 case EXT4_IOC_SETFSUUID:
1682 break;
1683 default:
1684 return -ENOIOCTLCMD;
1685 }
1686 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1687}
1688#endif
1689
1690static void set_overhead(struct ext4_super_block *es, const void *arg)
1691{
1692 es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg));
1693}
1694
1695int ext4_update_overhead(struct super_block *sb, bool force)
1696{
1697 struct ext4_sb_info *sbi = EXT4_SB(sb);
1698
1699 if (sb_rdonly(sb))
1700 return 0;
1701 if (!force &&
1702 (sbi->s_overhead == 0 ||
1703 sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters)))
1704 return 0;
1705 return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead);
1706}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext4/ioctl.c
4 *
5 * Copyright (C) 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 */
10
11#include <linux/fs.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 <linux/quotaops.h>
18#include <linux/random.h>
19#include <linux/uuid.h>
20#include <linux/uaccess.h>
21#include <linux/delay.h>
22#include <linux/iversion.h>
23#include "ext4_jbd2.h"
24#include "ext4.h"
25#include <linux/fsmap.h>
26#include "fsmap.h"
27#include <trace/events/ext4.h>
28
29/**
30 * Swap memory between @a and @b for @len bytes.
31 *
32 * @a: pointer to first memory area
33 * @b: pointer to second memory area
34 * @len: number of bytes to swap
35 *
36 */
37static void memswap(void *a, void *b, size_t len)
38{
39 unsigned char *ap, *bp;
40
41 ap = (unsigned char *)a;
42 bp = (unsigned char *)b;
43 while (len-- > 0) {
44 swap(*ap, *bp);
45 ap++;
46 bp++;
47 }
48}
49
50/**
51 * Swap i_data and associated attributes between @inode1 and @inode2.
52 * This function is used for the primary swap between inode1 and inode2
53 * and also to revert this primary swap in case of errors.
54 *
55 * Therefore you have to make sure, that calling this method twice
56 * will revert all changes.
57 *
58 * @inode1: pointer to first inode
59 * @inode2: pointer to second inode
60 */
61static void swap_inode_data(struct inode *inode1, struct inode *inode2)
62{
63 loff_t isize;
64 struct ext4_inode_info *ei1;
65 struct ext4_inode_info *ei2;
66
67 ei1 = EXT4_I(inode1);
68 ei2 = EXT4_I(inode2);
69
70 swap(inode1->i_flags, inode2->i_flags);
71 swap(inode1->i_version, inode2->i_version);
72 swap(inode1->i_blocks, inode2->i_blocks);
73 swap(inode1->i_bytes, inode2->i_bytes);
74 swap(inode1->i_atime, inode2->i_atime);
75 swap(inode1->i_mtime, inode2->i_mtime);
76
77 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
78 swap(ei1->i_flags, ei2->i_flags);
79 swap(ei1->i_disksize, ei2->i_disksize);
80 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
81 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
82
83 isize = i_size_read(inode1);
84 i_size_write(inode1, i_size_read(inode2));
85 i_size_write(inode2, isize);
86}
87
88/**
89 * Swap the information from the given @inode and the inode
90 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
91 * important fields of the inodes.
92 *
93 * @sb: the super block of the filesystem
94 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
95 *
96 */
97static long swap_inode_boot_loader(struct super_block *sb,
98 struct inode *inode)
99{
100 handle_t *handle;
101 int err;
102 struct inode *inode_bl;
103 struct ext4_inode_info *ei_bl;
104
105 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
106 return -EINVAL;
107
108 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
109 return -EPERM;
110
111 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
112 if (IS_ERR(inode_bl))
113 return PTR_ERR(inode_bl);
114 ei_bl = EXT4_I(inode_bl);
115
116 filemap_flush(inode->i_mapping);
117 filemap_flush(inode_bl->i_mapping);
118
119 /* Protect orig inodes against a truncate and make sure,
120 * that only 1 swap_inode_boot_loader is running. */
121 lock_two_nondirectories(inode, inode_bl);
122
123 truncate_inode_pages(&inode->i_data, 0);
124 truncate_inode_pages(&inode_bl->i_data, 0);
125
126 /* Wait for all existing dio workers */
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_set_iversion(inode_bl, 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 = current_time(inode);
159
160 inode->i_generation = prandom_u32();
161 inode_bl->i_generation = prandom_u32();
162
163 ext4_discard_preallocations(inode);
164
165 err = ext4_mark_inode_dirty(handle, inode);
166 if (err < 0) {
167 ext4_warning(inode->i_sb,
168 "couldn't mark inode #%lu dirty (err %d)",
169 inode->i_ino, err);
170 /* Revert all changes: */
171 swap_inode_data(inode, inode_bl);
172 } else {
173 err = ext4_mark_inode_dirty(handle, inode_bl);
174 if (err < 0) {
175 ext4_warning(inode_bl->i_sb,
176 "couldn't mark inode #%lu dirty (err %d)",
177 inode_bl->i_ino, err);
178 /* Revert all changes: */
179 swap_inode_data(inode, inode_bl);
180 ext4_mark_inode_dirty(handle, inode);
181 }
182 }
183 ext4_journal_stop(handle);
184 ext4_double_up_write_data_sem(inode, inode_bl);
185
186journal_err_out:
187 unlock_two_nondirectories(inode, inode_bl);
188 iput(inode_bl);
189 return err;
190}
191
192#ifdef CONFIG_EXT4_FS_ENCRYPTION
193static int uuid_is_zero(__u8 u[16])
194{
195 int i;
196
197 for (i = 0; i < 16; i++)
198 if (u[i])
199 return 0;
200 return 1;
201}
202#endif
203
204static int ext4_ioctl_setflags(struct inode *inode,
205 unsigned int flags)
206{
207 struct ext4_inode_info *ei = EXT4_I(inode);
208 handle_t *handle = NULL;
209 int err = -EPERM, migrate = 0;
210 struct ext4_iloc iloc;
211 unsigned int oldflags, mask, i;
212 unsigned int jflag;
213
214 /* Is it quota file? Do not allow user to mess with it */
215 if (ext4_is_quota_file(inode))
216 goto flags_out;
217
218 oldflags = ei->i_flags;
219
220 /* The JOURNAL_DATA flag is modifiable only by root */
221 jflag = flags & EXT4_JOURNAL_DATA_FL;
222
223 /*
224 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
225 * the relevant capability.
226 *
227 * This test looks nicer. Thanks to Pauline Middelink
228 */
229 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
230 if (!capable(CAP_LINUX_IMMUTABLE))
231 goto flags_out;
232 }
233
234 /*
235 * The JOURNAL_DATA flag can only be changed by
236 * the relevant capability.
237 */
238 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
239 if (!capable(CAP_SYS_RESOURCE))
240 goto flags_out;
241 }
242 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
243 migrate = 1;
244
245 if (flags & EXT4_EOFBLOCKS_FL) {
246 /* we don't support adding EOFBLOCKS flag */
247 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
248 err = -EOPNOTSUPP;
249 goto flags_out;
250 }
251 } else if (oldflags & EXT4_EOFBLOCKS_FL) {
252 err = ext4_truncate(inode);
253 if (err)
254 goto flags_out;
255 }
256
257 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
258 if (IS_ERR(handle)) {
259 err = PTR_ERR(handle);
260 goto flags_out;
261 }
262 if (IS_SYNC(inode))
263 ext4_handle_sync(handle);
264 err = ext4_reserve_inode_write(handle, inode, &iloc);
265 if (err)
266 goto flags_err;
267
268 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
269 if (!(mask & EXT4_FL_USER_MODIFIABLE))
270 continue;
271 /* These flags get special treatment later */
272 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
273 continue;
274 if (mask & flags)
275 ext4_set_inode_flag(inode, i);
276 else
277 ext4_clear_inode_flag(inode, i);
278 }
279
280 ext4_set_inode_flags(inode);
281 inode->i_ctime = current_time(inode);
282
283 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
284flags_err:
285 ext4_journal_stop(handle);
286 if (err)
287 goto flags_out;
288
289 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
290 /*
291 * Changes to the journaling mode can cause unsafe changes to
292 * S_DAX if we are using the DAX mount option.
293 */
294 if (test_opt(inode->i_sb, DAX)) {
295 err = -EBUSY;
296 goto flags_out;
297 }
298
299 err = ext4_change_inode_journal_flag(inode, jflag);
300 if (err)
301 goto flags_out;
302 }
303 if (migrate) {
304 if (flags & EXT4_EXTENTS_FL)
305 err = ext4_ext_migrate(inode);
306 else
307 err = ext4_ind_migrate(inode);
308 }
309
310flags_out:
311 return err;
312}
313
314#ifdef CONFIG_QUOTA
315static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
316{
317 struct inode *inode = file_inode(filp);
318 struct super_block *sb = inode->i_sb;
319 struct ext4_inode_info *ei = EXT4_I(inode);
320 int err, rc;
321 handle_t *handle;
322 kprojid_t kprojid;
323 struct ext4_iloc iloc;
324 struct ext4_inode *raw_inode;
325 struct dquot *transfer_to[MAXQUOTAS] = { };
326
327 if (!ext4_has_feature_project(sb)) {
328 if (projid != EXT4_DEF_PROJID)
329 return -EOPNOTSUPP;
330 else
331 return 0;
332 }
333
334 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
335 return -EOPNOTSUPP;
336
337 kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
338
339 if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
340 return 0;
341
342 err = mnt_want_write_file(filp);
343 if (err)
344 return err;
345
346 err = -EPERM;
347 inode_lock(inode);
348 /* Is it quota file? Do not allow user to mess with it */
349 if (ext4_is_quota_file(inode))
350 goto out_unlock;
351
352 err = ext4_get_inode_loc(inode, &iloc);
353 if (err)
354 goto out_unlock;
355
356 raw_inode = ext4_raw_inode(&iloc);
357 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
358 err = ext4_expand_extra_isize(inode,
359 EXT4_SB(sb)->s_want_extra_isize,
360 &iloc);
361 if (err)
362 goto out_unlock;
363 } else {
364 brelse(iloc.bh);
365 }
366
367 dquot_initialize(inode);
368
369 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
370 EXT4_QUOTA_INIT_BLOCKS(sb) +
371 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
372 if (IS_ERR(handle)) {
373 err = PTR_ERR(handle);
374 goto out_unlock;
375 }
376
377 err = ext4_reserve_inode_write(handle, inode, &iloc);
378 if (err)
379 goto out_stop;
380
381 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
382 if (!IS_ERR(transfer_to[PRJQUOTA])) {
383
384 /* __dquot_transfer() calls back ext4_get_inode_usage() which
385 * counts xattr inode references.
386 */
387 down_read(&EXT4_I(inode)->xattr_sem);
388 err = __dquot_transfer(inode, transfer_to);
389 up_read(&EXT4_I(inode)->xattr_sem);
390 dqput(transfer_to[PRJQUOTA]);
391 if (err)
392 goto out_dirty;
393 }
394
395 EXT4_I(inode)->i_projid = kprojid;
396 inode->i_ctime = current_time(inode);
397out_dirty:
398 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
399 if (!err)
400 err = rc;
401out_stop:
402 ext4_journal_stop(handle);
403out_unlock:
404 inode_unlock(inode);
405 mnt_drop_write_file(filp);
406 return err;
407}
408#else
409static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
410{
411 if (projid != EXT4_DEF_PROJID)
412 return -EOPNOTSUPP;
413 return 0;
414}
415#endif
416
417/* Transfer internal flags to xflags */
418static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
419{
420 __u32 xflags = 0;
421
422 if (iflags & EXT4_SYNC_FL)
423 xflags |= FS_XFLAG_SYNC;
424 if (iflags & EXT4_IMMUTABLE_FL)
425 xflags |= FS_XFLAG_IMMUTABLE;
426 if (iflags & EXT4_APPEND_FL)
427 xflags |= FS_XFLAG_APPEND;
428 if (iflags & EXT4_NODUMP_FL)
429 xflags |= FS_XFLAG_NODUMP;
430 if (iflags & EXT4_NOATIME_FL)
431 xflags |= FS_XFLAG_NOATIME;
432 if (iflags & EXT4_PROJINHERIT_FL)
433 xflags |= FS_XFLAG_PROJINHERIT;
434 return xflags;
435}
436
437#define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
438 FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
439 FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
440
441/* Transfer xflags flags to internal */
442static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
443{
444 unsigned long iflags = 0;
445
446 if (xflags & FS_XFLAG_SYNC)
447 iflags |= EXT4_SYNC_FL;
448 if (xflags & FS_XFLAG_IMMUTABLE)
449 iflags |= EXT4_IMMUTABLE_FL;
450 if (xflags & FS_XFLAG_APPEND)
451 iflags |= EXT4_APPEND_FL;
452 if (xflags & FS_XFLAG_NODUMP)
453 iflags |= EXT4_NODUMP_FL;
454 if (xflags & FS_XFLAG_NOATIME)
455 iflags |= EXT4_NOATIME_FL;
456 if (xflags & FS_XFLAG_PROJINHERIT)
457 iflags |= EXT4_PROJINHERIT_FL;
458
459 return iflags;
460}
461
462static int ext4_shutdown(struct super_block *sb, unsigned long arg)
463{
464 struct ext4_sb_info *sbi = EXT4_SB(sb);
465 __u32 flags;
466
467 if (!capable(CAP_SYS_ADMIN))
468 return -EPERM;
469
470 if (get_user(flags, (__u32 __user *)arg))
471 return -EFAULT;
472
473 if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
474 return -EINVAL;
475
476 if (ext4_forced_shutdown(sbi))
477 return 0;
478
479 ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
480 trace_ext4_shutdown(sb, flags);
481
482 switch (flags) {
483 case EXT4_GOING_FLAGS_DEFAULT:
484 freeze_bdev(sb->s_bdev);
485 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
486 thaw_bdev(sb->s_bdev, sb);
487 break;
488 case EXT4_GOING_FLAGS_LOGFLUSH:
489 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
490 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
491 (void) ext4_force_commit(sb);
492 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
493 }
494 break;
495 case EXT4_GOING_FLAGS_NOLOGFLUSH:
496 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
497 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
498 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
499 break;
500 default:
501 return -EINVAL;
502 }
503 clear_opt(sb, DISCARD);
504 return 0;
505}
506
507struct getfsmap_info {
508 struct super_block *gi_sb;
509 struct fsmap_head __user *gi_data;
510 unsigned int gi_idx;
511 __u32 gi_last_flags;
512};
513
514static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
515{
516 struct getfsmap_info *info = priv;
517 struct fsmap fm;
518
519 trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
520
521 info->gi_last_flags = xfm->fmr_flags;
522 ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
523 if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
524 sizeof(struct fsmap)))
525 return -EFAULT;
526
527 return 0;
528}
529
530static int ext4_ioc_getfsmap(struct super_block *sb,
531 struct fsmap_head __user *arg)
532{
533 struct getfsmap_info info = {0};
534 struct ext4_fsmap_head xhead = {0};
535 struct fsmap_head head;
536 bool aborted = false;
537 int error;
538
539 if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
540 return -EFAULT;
541 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
542 memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
543 sizeof(head.fmh_keys[0].fmr_reserved)) ||
544 memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
545 sizeof(head.fmh_keys[1].fmr_reserved)))
546 return -EINVAL;
547 /*
548 * ext4 doesn't report file extents at all, so the only valid
549 * file offsets are the magic ones (all zeroes or all ones).
550 */
551 if (head.fmh_keys[0].fmr_offset ||
552 (head.fmh_keys[1].fmr_offset != 0 &&
553 head.fmh_keys[1].fmr_offset != -1ULL))
554 return -EINVAL;
555
556 xhead.fmh_iflags = head.fmh_iflags;
557 xhead.fmh_count = head.fmh_count;
558 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
559 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
560
561 trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
562 trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
563
564 info.gi_sb = sb;
565 info.gi_data = arg;
566 error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
567 if (error == EXT4_QUERY_RANGE_ABORT) {
568 error = 0;
569 aborted = true;
570 } else if (error)
571 return error;
572
573 /* If we didn't abort, set the "last" flag in the last fmx */
574 if (!aborted && info.gi_idx) {
575 info.gi_last_flags |= FMR_OF_LAST;
576 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
577 &info.gi_last_flags,
578 sizeof(info.gi_last_flags)))
579 return -EFAULT;
580 }
581
582 /* copy back header */
583 head.fmh_entries = xhead.fmh_entries;
584 head.fmh_oflags = xhead.fmh_oflags;
585 if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
586 return -EFAULT;
587
588 return 0;
589}
590
591static long ext4_ioctl_group_add(struct file *file,
592 struct ext4_new_group_data *input)
593{
594 struct super_block *sb = file_inode(file)->i_sb;
595 int err, err2=0;
596
597 err = ext4_resize_begin(sb);
598 if (err)
599 return err;
600
601 if (ext4_has_feature_bigalloc(sb)) {
602 ext4_msg(sb, KERN_ERR,
603 "Online resizing not supported with bigalloc");
604 err = -EOPNOTSUPP;
605 goto group_add_out;
606 }
607
608 err = mnt_want_write_file(file);
609 if (err)
610 goto group_add_out;
611
612 err = ext4_group_add(sb, input);
613 if (EXT4_SB(sb)->s_journal) {
614 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
615 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
616 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
617 }
618 if (err == 0)
619 err = err2;
620 mnt_drop_write_file(file);
621 if (!err && ext4_has_group_desc_csum(sb) &&
622 test_opt(sb, INIT_INODE_TABLE))
623 err = ext4_register_li_request(sb, input->group);
624group_add_out:
625 ext4_resize_end(sb);
626 return err;
627}
628
629long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
630{
631 struct inode *inode = file_inode(filp);
632 struct super_block *sb = inode->i_sb;
633 struct ext4_inode_info *ei = EXT4_I(inode);
634 unsigned int flags;
635
636 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
637
638 switch (cmd) {
639 case FS_IOC_GETFSMAP:
640 return ext4_ioc_getfsmap(sb, (void __user *)arg);
641 case EXT4_IOC_GETFLAGS:
642 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
643 return put_user(flags, (int __user *) arg);
644 case EXT4_IOC_SETFLAGS: {
645 int err;
646
647 if (!inode_owner_or_capable(inode))
648 return -EACCES;
649
650 if (get_user(flags, (int __user *) arg))
651 return -EFAULT;
652
653 if (flags & ~EXT4_FL_USER_VISIBLE)
654 return -EOPNOTSUPP;
655 /*
656 * chattr(1) grabs flags via GETFLAGS, modifies the result and
657 * passes that to SETFLAGS. So we cannot easily make SETFLAGS
658 * more restrictive than just silently masking off visible but
659 * not settable flags as we always did.
660 */
661 flags &= EXT4_FL_USER_MODIFIABLE;
662 if (ext4_mask_flags(inode->i_mode, flags) != flags)
663 return -EOPNOTSUPP;
664
665 err = mnt_want_write_file(filp);
666 if (err)
667 return err;
668
669 inode_lock(inode);
670 err = ext4_ioctl_setflags(inode, flags);
671 inode_unlock(inode);
672 mnt_drop_write_file(filp);
673 return err;
674 }
675 case EXT4_IOC_GETVERSION:
676 case EXT4_IOC_GETVERSION_OLD:
677 return put_user(inode->i_generation, (int __user *) arg);
678 case EXT4_IOC_SETVERSION:
679 case EXT4_IOC_SETVERSION_OLD: {
680 handle_t *handle;
681 struct ext4_iloc iloc;
682 __u32 generation;
683 int err;
684
685 if (!inode_owner_or_capable(inode))
686 return -EPERM;
687
688 if (ext4_has_metadata_csum(inode->i_sb)) {
689 ext4_warning(sb, "Setting inode version is not "
690 "supported with metadata_csum enabled.");
691 return -ENOTTY;
692 }
693
694 err = mnt_want_write_file(filp);
695 if (err)
696 return err;
697 if (get_user(generation, (int __user *) arg)) {
698 err = -EFAULT;
699 goto setversion_out;
700 }
701
702 inode_lock(inode);
703 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
704 if (IS_ERR(handle)) {
705 err = PTR_ERR(handle);
706 goto unlock_out;
707 }
708 err = ext4_reserve_inode_write(handle, inode, &iloc);
709 if (err == 0) {
710 inode->i_ctime = current_time(inode);
711 inode->i_generation = generation;
712 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
713 }
714 ext4_journal_stop(handle);
715
716unlock_out:
717 inode_unlock(inode);
718setversion_out:
719 mnt_drop_write_file(filp);
720 return err;
721 }
722 case EXT4_IOC_GROUP_EXTEND: {
723 ext4_fsblk_t n_blocks_count;
724 int err, err2=0;
725
726 err = ext4_resize_begin(sb);
727 if (err)
728 return err;
729
730 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
731 err = -EFAULT;
732 goto group_extend_out;
733 }
734
735 if (ext4_has_feature_bigalloc(sb)) {
736 ext4_msg(sb, KERN_ERR,
737 "Online resizing not supported with bigalloc");
738 err = -EOPNOTSUPP;
739 goto group_extend_out;
740 }
741
742 err = mnt_want_write_file(filp);
743 if (err)
744 goto group_extend_out;
745
746 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
747 if (EXT4_SB(sb)->s_journal) {
748 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
749 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
750 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
751 }
752 if (err == 0)
753 err = err2;
754 mnt_drop_write_file(filp);
755group_extend_out:
756 ext4_resize_end(sb);
757 return err;
758 }
759
760 case EXT4_IOC_MOVE_EXT: {
761 struct move_extent me;
762 struct fd donor;
763 int err;
764
765 if (!(filp->f_mode & FMODE_READ) ||
766 !(filp->f_mode & FMODE_WRITE))
767 return -EBADF;
768
769 if (copy_from_user(&me,
770 (struct move_extent __user *)arg, sizeof(me)))
771 return -EFAULT;
772 me.moved_len = 0;
773
774 donor = fdget(me.donor_fd);
775 if (!donor.file)
776 return -EBADF;
777
778 if (!(donor.file->f_mode & FMODE_WRITE)) {
779 err = -EBADF;
780 goto mext_out;
781 }
782
783 if (ext4_has_feature_bigalloc(sb)) {
784 ext4_msg(sb, KERN_ERR,
785 "Online defrag not supported with bigalloc");
786 err = -EOPNOTSUPP;
787 goto mext_out;
788 } else if (IS_DAX(inode)) {
789 ext4_msg(sb, KERN_ERR,
790 "Online defrag not supported with DAX");
791 err = -EOPNOTSUPP;
792 goto mext_out;
793 }
794
795 err = mnt_want_write_file(filp);
796 if (err)
797 goto mext_out;
798
799 err = ext4_move_extents(filp, donor.file, me.orig_start,
800 me.donor_start, me.len, &me.moved_len);
801 mnt_drop_write_file(filp);
802
803 if (copy_to_user((struct move_extent __user *)arg,
804 &me, sizeof(me)))
805 err = -EFAULT;
806mext_out:
807 fdput(donor);
808 return err;
809 }
810
811 case EXT4_IOC_GROUP_ADD: {
812 struct ext4_new_group_data input;
813
814 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
815 sizeof(input)))
816 return -EFAULT;
817
818 return ext4_ioctl_group_add(filp, &input);
819 }
820
821 case EXT4_IOC_MIGRATE:
822 {
823 int err;
824 if (!inode_owner_or_capable(inode))
825 return -EACCES;
826
827 err = mnt_want_write_file(filp);
828 if (err)
829 return err;
830 /*
831 * inode_mutex prevent write and truncate on the file.
832 * Read still goes through. We take i_data_sem in
833 * ext4_ext_swap_inode_data before we switch the
834 * inode format to prevent read.
835 */
836 inode_lock((inode));
837 err = ext4_ext_migrate(inode);
838 inode_unlock((inode));
839 mnt_drop_write_file(filp);
840 return err;
841 }
842
843 case EXT4_IOC_ALLOC_DA_BLKS:
844 {
845 int err;
846 if (!inode_owner_or_capable(inode))
847 return -EACCES;
848
849 err = mnt_want_write_file(filp);
850 if (err)
851 return err;
852 err = ext4_alloc_da_blocks(inode);
853 mnt_drop_write_file(filp);
854 return err;
855 }
856
857 case EXT4_IOC_SWAP_BOOT:
858 {
859 int err;
860 if (!(filp->f_mode & FMODE_WRITE))
861 return -EBADF;
862 err = mnt_want_write_file(filp);
863 if (err)
864 return err;
865 err = swap_inode_boot_loader(sb, inode);
866 mnt_drop_write_file(filp);
867 return err;
868 }
869
870 case EXT4_IOC_RESIZE_FS: {
871 ext4_fsblk_t n_blocks_count;
872 int err = 0, err2 = 0;
873 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
874
875 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
876 sizeof(__u64))) {
877 return -EFAULT;
878 }
879
880 err = ext4_resize_begin(sb);
881 if (err)
882 return err;
883
884 err = mnt_want_write_file(filp);
885 if (err)
886 goto resizefs_out;
887
888 err = ext4_resize_fs(sb, n_blocks_count);
889 if (EXT4_SB(sb)->s_journal) {
890 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
891 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
892 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
893 }
894 if (err == 0)
895 err = err2;
896 mnt_drop_write_file(filp);
897 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
898 ext4_has_group_desc_csum(sb) &&
899 test_opt(sb, INIT_INODE_TABLE))
900 err = ext4_register_li_request(sb, o_group);
901
902resizefs_out:
903 ext4_resize_end(sb);
904 return err;
905 }
906
907 case FITRIM:
908 {
909 struct request_queue *q = bdev_get_queue(sb->s_bdev);
910 struct fstrim_range range;
911 int ret = 0;
912
913 if (!capable(CAP_SYS_ADMIN))
914 return -EPERM;
915
916 if (!blk_queue_discard(q))
917 return -EOPNOTSUPP;
918
919 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
920 sizeof(range)))
921 return -EFAULT;
922
923 range.minlen = max((unsigned int)range.minlen,
924 q->limits.discard_granularity);
925 ret = ext4_trim_fs(sb, &range);
926 if (ret < 0)
927 return ret;
928
929 if (copy_to_user((struct fstrim_range __user *)arg, &range,
930 sizeof(range)))
931 return -EFAULT;
932
933 return 0;
934 }
935 case EXT4_IOC_PRECACHE_EXTENTS:
936 return ext4_ext_precache(inode);
937
938 case EXT4_IOC_SET_ENCRYPTION_POLICY:
939 if (!ext4_has_feature_encrypt(sb))
940 return -EOPNOTSUPP;
941 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
942
943 case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
944#ifdef CONFIG_EXT4_FS_ENCRYPTION
945 int err, err2;
946 struct ext4_sb_info *sbi = EXT4_SB(sb);
947 handle_t *handle;
948
949 if (!ext4_has_feature_encrypt(sb))
950 return -EOPNOTSUPP;
951 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
952 err = mnt_want_write_file(filp);
953 if (err)
954 return err;
955 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
956 if (IS_ERR(handle)) {
957 err = PTR_ERR(handle);
958 goto pwsalt_err_exit;
959 }
960 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
961 if (err)
962 goto pwsalt_err_journal;
963 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
964 err = ext4_handle_dirty_metadata(handle, NULL,
965 sbi->s_sbh);
966 pwsalt_err_journal:
967 err2 = ext4_journal_stop(handle);
968 if (err2 && !err)
969 err = err2;
970 pwsalt_err_exit:
971 mnt_drop_write_file(filp);
972 if (err)
973 return err;
974 }
975 if (copy_to_user((void __user *) arg,
976 sbi->s_es->s_encrypt_pw_salt, 16))
977 return -EFAULT;
978 return 0;
979#else
980 return -EOPNOTSUPP;
981#endif
982 }
983 case EXT4_IOC_GET_ENCRYPTION_POLICY:
984 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
985
986 case EXT4_IOC_FSGETXATTR:
987 {
988 struct fsxattr fa;
989
990 memset(&fa, 0, sizeof(struct fsxattr));
991 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
992
993 if (ext4_has_feature_project(inode->i_sb)) {
994 fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
995 EXT4_I(inode)->i_projid);
996 }
997
998 if (copy_to_user((struct fsxattr __user *)arg,
999 &fa, sizeof(fa)))
1000 return -EFAULT;
1001 return 0;
1002 }
1003 case EXT4_IOC_FSSETXATTR:
1004 {
1005 struct fsxattr fa;
1006 int err;
1007
1008 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1009 sizeof(fa)))
1010 return -EFAULT;
1011
1012 /* Make sure caller has proper permission */
1013 if (!inode_owner_or_capable(inode))
1014 return -EACCES;
1015
1016 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1017 return -EOPNOTSUPP;
1018
1019 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1020 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1021 return -EOPNOTSUPP;
1022
1023 err = mnt_want_write_file(filp);
1024 if (err)
1025 return err;
1026
1027 inode_lock(inode);
1028 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1029 (flags & EXT4_FL_XFLAG_VISIBLE);
1030 err = ext4_ioctl_setflags(inode, flags);
1031 inode_unlock(inode);
1032 mnt_drop_write_file(filp);
1033 if (err)
1034 return err;
1035
1036 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1037 if (err)
1038 return err;
1039
1040 return 0;
1041 }
1042 case EXT4_IOC_SHUTDOWN:
1043 return ext4_shutdown(sb, arg);
1044 default:
1045 return -ENOTTY;
1046 }
1047}
1048
1049#ifdef CONFIG_COMPAT
1050long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1051{
1052 /* These are just misnamed, they actually get/put from/to user an int */
1053 switch (cmd) {
1054 case EXT4_IOC32_GETFLAGS:
1055 cmd = EXT4_IOC_GETFLAGS;
1056 break;
1057 case EXT4_IOC32_SETFLAGS:
1058 cmd = EXT4_IOC_SETFLAGS;
1059 break;
1060 case EXT4_IOC32_GETVERSION:
1061 cmd = EXT4_IOC_GETVERSION;
1062 break;
1063 case EXT4_IOC32_SETVERSION:
1064 cmd = EXT4_IOC_SETVERSION;
1065 break;
1066 case EXT4_IOC32_GROUP_EXTEND:
1067 cmd = EXT4_IOC_GROUP_EXTEND;
1068 break;
1069 case EXT4_IOC32_GETVERSION_OLD:
1070 cmd = EXT4_IOC_GETVERSION_OLD;
1071 break;
1072 case EXT4_IOC32_SETVERSION_OLD:
1073 cmd = EXT4_IOC_SETVERSION_OLD;
1074 break;
1075 case EXT4_IOC32_GETRSVSZ:
1076 cmd = EXT4_IOC_GETRSVSZ;
1077 break;
1078 case EXT4_IOC32_SETRSVSZ:
1079 cmd = EXT4_IOC_SETRSVSZ;
1080 break;
1081 case EXT4_IOC32_GROUP_ADD: {
1082 struct compat_ext4_new_group_input __user *uinput;
1083 struct ext4_new_group_data input;
1084 int err;
1085
1086 uinput = compat_ptr(arg);
1087 err = get_user(input.group, &uinput->group);
1088 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1089 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1090 err |= get_user(input.inode_table, &uinput->inode_table);
1091 err |= get_user(input.blocks_count, &uinput->blocks_count);
1092 err |= get_user(input.reserved_blocks,
1093 &uinput->reserved_blocks);
1094 if (err)
1095 return -EFAULT;
1096 return ext4_ioctl_group_add(file, &input);
1097 }
1098 case EXT4_IOC_MOVE_EXT:
1099 case EXT4_IOC_RESIZE_FS:
1100 case EXT4_IOC_PRECACHE_EXTENTS:
1101 case EXT4_IOC_SET_ENCRYPTION_POLICY:
1102 case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1103 case EXT4_IOC_GET_ENCRYPTION_POLICY:
1104 case EXT4_IOC_SHUTDOWN:
1105 case FS_IOC_GETFSMAP:
1106 break;
1107 default:
1108 return -ENOIOCTLCMD;
1109 }
1110 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1111}
1112#endif