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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 unsigned long tmp;
67
68 ei1 = EXT4_I(inode1);
69 ei2 = EXT4_I(inode2);
70
71 swap(inode1->i_version, inode2->i_version);
72 swap(inode1->i_atime, inode2->i_atime);
73 swap(inode1->i_mtime, inode2->i_mtime);
74
75 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
76 tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
77 ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
78 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
79 ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
80 swap(ei1->i_disksize, ei2->i_disksize);
81 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
82 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
83
84 isize = i_size_read(inode1);
85 i_size_write(inode1, i_size_read(inode2));
86 i_size_write(inode2, isize);
87}
88
89static void reset_inode_seed(struct inode *inode)
90{
91 struct ext4_inode_info *ei = EXT4_I(inode);
92 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
93 __le32 inum = cpu_to_le32(inode->i_ino);
94 __le32 gen = cpu_to_le32(inode->i_generation);
95 __u32 csum;
96
97 if (!ext4_has_metadata_csum(inode->i_sb))
98 return;
99
100 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
101 ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
102}
103
104/**
105 * Swap the information from the given @inode and the inode
106 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
107 * important fields of the inodes.
108 *
109 * @sb: the super block of the filesystem
110 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
111 *
112 */
113static long swap_inode_boot_loader(struct super_block *sb,
114 struct inode *inode)
115{
116 handle_t *handle;
117 int err;
118 struct inode *inode_bl;
119 struct ext4_inode_info *ei_bl;
120 qsize_t size, size_bl, diff;
121 blkcnt_t blocks;
122 unsigned short bytes;
123
124 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
125 if (IS_ERR(inode_bl))
126 return PTR_ERR(inode_bl);
127 ei_bl = EXT4_I(inode_bl);
128
129 /* Protect orig inodes against a truncate and make sure,
130 * that only 1 swap_inode_boot_loader is running. */
131 lock_two_nondirectories(inode, inode_bl);
132
133 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
134 IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
135 (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
136 ext4_has_inline_data(inode)) {
137 err = -EINVAL;
138 goto journal_err_out;
139 }
140
141 if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
142 !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
143 err = -EPERM;
144 goto journal_err_out;
145 }
146
147 down_write(&EXT4_I(inode)->i_mmap_sem);
148 err = filemap_write_and_wait(inode->i_mapping);
149 if (err)
150 goto err_out;
151
152 err = filemap_write_and_wait(inode_bl->i_mapping);
153 if (err)
154 goto err_out;
155
156 /* Wait for all existing dio workers */
157 inode_dio_wait(inode);
158 inode_dio_wait(inode_bl);
159
160 truncate_inode_pages(&inode->i_data, 0);
161 truncate_inode_pages(&inode_bl->i_data, 0);
162
163 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
164 if (IS_ERR(handle)) {
165 err = -EINVAL;
166 goto err_out;
167 }
168
169 /* Protect extent tree against block allocations via delalloc */
170 ext4_double_down_write_data_sem(inode, inode_bl);
171
172 if (inode_bl->i_nlink == 0) {
173 /* this inode has never been used as a BOOT_LOADER */
174 set_nlink(inode_bl, 1);
175 i_uid_write(inode_bl, 0);
176 i_gid_write(inode_bl, 0);
177 inode_bl->i_flags = 0;
178 ei_bl->i_flags = 0;
179 inode_set_iversion(inode_bl, 1);
180 i_size_write(inode_bl, 0);
181 inode_bl->i_mode = S_IFREG;
182 if (ext4_has_feature_extents(sb)) {
183 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
184 ext4_ext_tree_init(handle, inode_bl);
185 } else
186 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
187 }
188
189 err = dquot_initialize(inode);
190 if (err)
191 goto err_out1;
192
193 size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
194 size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
195 diff = size - size_bl;
196 swap_inode_data(inode, inode_bl);
197
198 inode->i_ctime = inode_bl->i_ctime = current_time(inode);
199
200 inode->i_generation = prandom_u32();
201 inode_bl->i_generation = prandom_u32();
202 reset_inode_seed(inode);
203 reset_inode_seed(inode_bl);
204
205 ext4_discard_preallocations(inode, 0);
206
207 err = ext4_mark_inode_dirty(handle, inode);
208 if (err < 0) {
209 /* No need to update quota information. */
210 ext4_warning(inode->i_sb,
211 "couldn't mark inode #%lu dirty (err %d)",
212 inode->i_ino, err);
213 /* Revert all changes: */
214 swap_inode_data(inode, inode_bl);
215 ext4_mark_inode_dirty(handle, inode);
216 goto err_out1;
217 }
218
219 blocks = inode_bl->i_blocks;
220 bytes = inode_bl->i_bytes;
221 inode_bl->i_blocks = inode->i_blocks;
222 inode_bl->i_bytes = inode->i_bytes;
223 err = ext4_mark_inode_dirty(handle, inode_bl);
224 if (err < 0) {
225 /* No need to update quota information. */
226 ext4_warning(inode_bl->i_sb,
227 "couldn't mark inode #%lu dirty (err %d)",
228 inode_bl->i_ino, err);
229 goto revert;
230 }
231
232 /* Bootloader inode should not be counted into quota information. */
233 if (diff > 0)
234 dquot_free_space(inode, diff);
235 else
236 err = dquot_alloc_space(inode, -1 * diff);
237
238 if (err < 0) {
239revert:
240 /* Revert all changes: */
241 inode_bl->i_blocks = blocks;
242 inode_bl->i_bytes = bytes;
243 swap_inode_data(inode, inode_bl);
244 ext4_mark_inode_dirty(handle, inode);
245 ext4_mark_inode_dirty(handle, inode_bl);
246 }
247
248err_out1:
249 ext4_journal_stop(handle);
250 ext4_double_up_write_data_sem(inode, inode_bl);
251
252err_out:
253 up_write(&EXT4_I(inode)->i_mmap_sem);
254journal_err_out:
255 unlock_two_nondirectories(inode, inode_bl);
256 iput(inode_bl);
257 return err;
258}
259
260#ifdef CONFIG_FS_ENCRYPTION
261static int uuid_is_zero(__u8 u[16])
262{
263 int i;
264
265 for (i = 0; i < 16; i++)
266 if (u[i])
267 return 0;
268 return 1;
269}
270#endif
271
272/*
273 * If immutable is set and we are not clearing it, we're not allowed to change
274 * anything else in the inode. Don't error out if we're only trying to set
275 * immutable on an immutable file.
276 */
277static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
278 unsigned int flags)
279{
280 struct ext4_inode_info *ei = EXT4_I(inode);
281 unsigned int oldflags = ei->i_flags;
282
283 if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
284 return 0;
285
286 if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
287 return -EPERM;
288 if (ext4_has_feature_project(inode->i_sb) &&
289 __kprojid_val(ei->i_projid) != new_projid)
290 return -EPERM;
291
292 return 0;
293}
294
295static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
296{
297 struct ext4_inode_info *ei = EXT4_I(inode);
298
299 if (S_ISDIR(inode->i_mode))
300 return;
301
302 if (test_opt2(inode->i_sb, DAX_NEVER) ||
303 test_opt(inode->i_sb, DAX_ALWAYS))
304 return;
305
306 if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
307 d_mark_dontcache(inode);
308}
309
310static bool dax_compatible(struct inode *inode, unsigned int oldflags,
311 unsigned int flags)
312{
313 if (flags & EXT4_DAX_FL) {
314 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
315 ext4_test_inode_state(inode,
316 EXT4_STATE_VERITY_IN_PROGRESS)) {
317 return false;
318 }
319 }
320
321 if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
322 return false;
323
324 return true;
325}
326
327static int ext4_ioctl_setflags(struct inode *inode,
328 unsigned int flags)
329{
330 struct ext4_inode_info *ei = EXT4_I(inode);
331 handle_t *handle = NULL;
332 int err = -EPERM, migrate = 0;
333 struct ext4_iloc iloc;
334 unsigned int oldflags, mask, i;
335 struct super_block *sb = inode->i_sb;
336
337 /* Is it quota file? Do not allow user to mess with it */
338 if (ext4_is_quota_file(inode))
339 goto flags_out;
340
341 oldflags = ei->i_flags;
342
343 err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
344 if (err)
345 goto flags_out;
346
347 /*
348 * The JOURNAL_DATA flag can only be changed by
349 * the relevant capability.
350 */
351 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
352 if (!capable(CAP_SYS_RESOURCE))
353 goto flags_out;
354 }
355
356 if (!dax_compatible(inode, oldflags, flags)) {
357 err = -EOPNOTSUPP;
358 goto flags_out;
359 }
360
361 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
362 migrate = 1;
363
364 if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
365 if (!ext4_has_feature_casefold(sb)) {
366 err = -EOPNOTSUPP;
367 goto flags_out;
368 }
369
370 if (!S_ISDIR(inode->i_mode)) {
371 err = -ENOTDIR;
372 goto flags_out;
373 }
374
375 if (!ext4_empty_dir(inode)) {
376 err = -ENOTEMPTY;
377 goto flags_out;
378 }
379 }
380
381 /*
382 * Wait for all pending directio and then flush all the dirty pages
383 * for this file. The flush marks all the pages readonly, so any
384 * subsequent attempt to write to the file (particularly mmap pages)
385 * will come through the filesystem and fail.
386 */
387 if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
388 (flags & EXT4_IMMUTABLE_FL)) {
389 inode_dio_wait(inode);
390 err = filemap_write_and_wait(inode->i_mapping);
391 if (err)
392 goto flags_out;
393 }
394
395 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
396 if (IS_ERR(handle)) {
397 err = PTR_ERR(handle);
398 goto flags_out;
399 }
400 if (IS_SYNC(inode))
401 ext4_handle_sync(handle);
402 err = ext4_reserve_inode_write(handle, inode, &iloc);
403 if (err)
404 goto flags_err;
405
406 ext4_dax_dontcache(inode, flags);
407
408 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
409 if (!(mask & EXT4_FL_USER_MODIFIABLE))
410 continue;
411 /* These flags get special treatment later */
412 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
413 continue;
414 if (mask & flags)
415 ext4_set_inode_flag(inode, i);
416 else
417 ext4_clear_inode_flag(inode, i);
418 }
419
420 ext4_set_inode_flags(inode, false);
421
422 inode->i_ctime = current_time(inode);
423
424 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
425flags_err:
426 ext4_journal_stop(handle);
427 if (err)
428 goto flags_out;
429
430 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
431 /*
432 * Changes to the journaling mode can cause unsafe changes to
433 * S_DAX if the inode is DAX
434 */
435 if (IS_DAX(inode)) {
436 err = -EBUSY;
437 goto flags_out;
438 }
439
440 err = ext4_change_inode_journal_flag(inode,
441 flags & EXT4_JOURNAL_DATA_FL);
442 if (err)
443 goto flags_out;
444 }
445 if (migrate) {
446 if (flags & EXT4_EXTENTS_FL)
447 err = ext4_ext_migrate(inode);
448 else
449 err = ext4_ind_migrate(inode);
450 }
451
452flags_out:
453 return err;
454}
455
456#ifdef CONFIG_QUOTA
457static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
458{
459 struct inode *inode = file_inode(filp);
460 struct super_block *sb = inode->i_sb;
461 struct ext4_inode_info *ei = EXT4_I(inode);
462 int err, rc;
463 handle_t *handle;
464 kprojid_t kprojid;
465 struct ext4_iloc iloc;
466 struct ext4_inode *raw_inode;
467 struct dquot *transfer_to[MAXQUOTAS] = { };
468
469 if (!ext4_has_feature_project(sb)) {
470 if (projid != EXT4_DEF_PROJID)
471 return -EOPNOTSUPP;
472 else
473 return 0;
474 }
475
476 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
477 return -EOPNOTSUPP;
478
479 kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
480
481 if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
482 return 0;
483
484 err = -EPERM;
485 /* Is it quota file? Do not allow user to mess with it */
486 if (ext4_is_quota_file(inode))
487 return err;
488
489 err = ext4_get_inode_loc(inode, &iloc);
490 if (err)
491 return err;
492
493 raw_inode = ext4_raw_inode(&iloc);
494 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
495 err = ext4_expand_extra_isize(inode,
496 EXT4_SB(sb)->s_want_extra_isize,
497 &iloc);
498 if (err)
499 return err;
500 } else {
501 brelse(iloc.bh);
502 }
503
504 err = dquot_initialize(inode);
505 if (err)
506 return err;
507
508 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
509 EXT4_QUOTA_INIT_BLOCKS(sb) +
510 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
511 if (IS_ERR(handle))
512 return PTR_ERR(handle);
513
514 err = ext4_reserve_inode_write(handle, inode, &iloc);
515 if (err)
516 goto out_stop;
517
518 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
519 if (!IS_ERR(transfer_to[PRJQUOTA])) {
520
521 /* __dquot_transfer() calls back ext4_get_inode_usage() which
522 * counts xattr inode references.
523 */
524 down_read(&EXT4_I(inode)->xattr_sem);
525 err = __dquot_transfer(inode, transfer_to);
526 up_read(&EXT4_I(inode)->xattr_sem);
527 dqput(transfer_to[PRJQUOTA]);
528 if (err)
529 goto out_dirty;
530 }
531
532 EXT4_I(inode)->i_projid = kprojid;
533 inode->i_ctime = current_time(inode);
534out_dirty:
535 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
536 if (!err)
537 err = rc;
538out_stop:
539 ext4_journal_stop(handle);
540 return err;
541}
542#else
543static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
544{
545 if (projid != EXT4_DEF_PROJID)
546 return -EOPNOTSUPP;
547 return 0;
548}
549#endif
550
551/* Transfer internal flags to xflags */
552static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
553{
554 __u32 xflags = 0;
555
556 if (iflags & EXT4_SYNC_FL)
557 xflags |= FS_XFLAG_SYNC;
558 if (iflags & EXT4_IMMUTABLE_FL)
559 xflags |= FS_XFLAG_IMMUTABLE;
560 if (iflags & EXT4_APPEND_FL)
561 xflags |= FS_XFLAG_APPEND;
562 if (iflags & EXT4_NODUMP_FL)
563 xflags |= FS_XFLAG_NODUMP;
564 if (iflags & EXT4_NOATIME_FL)
565 xflags |= FS_XFLAG_NOATIME;
566 if (iflags & EXT4_PROJINHERIT_FL)
567 xflags |= FS_XFLAG_PROJINHERIT;
568 if (iflags & EXT4_DAX_FL)
569 xflags |= FS_XFLAG_DAX;
570 return xflags;
571}
572
573#define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
574 FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
575 FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT | \
576 FS_XFLAG_DAX)
577
578/* Transfer xflags flags to internal */
579static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
580{
581 unsigned long iflags = 0;
582
583 if (xflags & FS_XFLAG_SYNC)
584 iflags |= EXT4_SYNC_FL;
585 if (xflags & FS_XFLAG_IMMUTABLE)
586 iflags |= EXT4_IMMUTABLE_FL;
587 if (xflags & FS_XFLAG_APPEND)
588 iflags |= EXT4_APPEND_FL;
589 if (xflags & FS_XFLAG_NODUMP)
590 iflags |= EXT4_NODUMP_FL;
591 if (xflags & FS_XFLAG_NOATIME)
592 iflags |= EXT4_NOATIME_FL;
593 if (xflags & FS_XFLAG_PROJINHERIT)
594 iflags |= EXT4_PROJINHERIT_FL;
595 if (xflags & FS_XFLAG_DAX)
596 iflags |= EXT4_DAX_FL;
597
598 return iflags;
599}
600
601static int ext4_shutdown(struct super_block *sb, unsigned long arg)
602{
603 struct ext4_sb_info *sbi = EXT4_SB(sb);
604 __u32 flags;
605
606 if (!capable(CAP_SYS_ADMIN))
607 return -EPERM;
608
609 if (get_user(flags, (__u32 __user *)arg))
610 return -EFAULT;
611
612 if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
613 return -EINVAL;
614
615 if (ext4_forced_shutdown(sbi))
616 return 0;
617
618 ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
619 trace_ext4_shutdown(sb, flags);
620
621 switch (flags) {
622 case EXT4_GOING_FLAGS_DEFAULT:
623 freeze_bdev(sb->s_bdev);
624 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
625 thaw_bdev(sb->s_bdev, sb);
626 break;
627 case EXT4_GOING_FLAGS_LOGFLUSH:
628 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
629 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
630 (void) ext4_force_commit(sb);
631 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
632 }
633 break;
634 case EXT4_GOING_FLAGS_NOLOGFLUSH:
635 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
636 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
637 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
638 break;
639 default:
640 return -EINVAL;
641 }
642 clear_opt(sb, DISCARD);
643 return 0;
644}
645
646struct getfsmap_info {
647 struct super_block *gi_sb;
648 struct fsmap_head __user *gi_data;
649 unsigned int gi_idx;
650 __u32 gi_last_flags;
651};
652
653static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
654{
655 struct getfsmap_info *info = priv;
656 struct fsmap fm;
657
658 trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
659
660 info->gi_last_flags = xfm->fmr_flags;
661 ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
662 if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
663 sizeof(struct fsmap)))
664 return -EFAULT;
665
666 return 0;
667}
668
669static int ext4_ioc_getfsmap(struct super_block *sb,
670 struct fsmap_head __user *arg)
671{
672 struct getfsmap_info info = { NULL };
673 struct ext4_fsmap_head xhead = {0};
674 struct fsmap_head head;
675 bool aborted = false;
676 int error;
677
678 if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
679 return -EFAULT;
680 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
681 memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
682 sizeof(head.fmh_keys[0].fmr_reserved)) ||
683 memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
684 sizeof(head.fmh_keys[1].fmr_reserved)))
685 return -EINVAL;
686 /*
687 * ext4 doesn't report file extents at all, so the only valid
688 * file offsets are the magic ones (all zeroes or all ones).
689 */
690 if (head.fmh_keys[0].fmr_offset ||
691 (head.fmh_keys[1].fmr_offset != 0 &&
692 head.fmh_keys[1].fmr_offset != -1ULL))
693 return -EINVAL;
694
695 xhead.fmh_iflags = head.fmh_iflags;
696 xhead.fmh_count = head.fmh_count;
697 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
698 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
699
700 trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
701 trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
702
703 info.gi_sb = sb;
704 info.gi_data = arg;
705 error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
706 if (error == EXT4_QUERY_RANGE_ABORT) {
707 error = 0;
708 aborted = true;
709 } else if (error)
710 return error;
711
712 /* If we didn't abort, set the "last" flag in the last fmx */
713 if (!aborted && info.gi_idx) {
714 info.gi_last_flags |= FMR_OF_LAST;
715 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
716 &info.gi_last_flags,
717 sizeof(info.gi_last_flags)))
718 return -EFAULT;
719 }
720
721 /* copy back header */
722 head.fmh_entries = xhead.fmh_entries;
723 head.fmh_oflags = xhead.fmh_oflags;
724 if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
725 return -EFAULT;
726
727 return 0;
728}
729
730static long ext4_ioctl_group_add(struct file *file,
731 struct ext4_new_group_data *input)
732{
733 struct super_block *sb = file_inode(file)->i_sb;
734 int err, err2=0;
735
736 err = ext4_resize_begin(sb);
737 if (err)
738 return err;
739
740 if (ext4_has_feature_bigalloc(sb)) {
741 ext4_msg(sb, KERN_ERR,
742 "Online resizing not supported with bigalloc");
743 err = -EOPNOTSUPP;
744 goto group_add_out;
745 }
746
747 err = mnt_want_write_file(file);
748 if (err)
749 goto group_add_out;
750
751 err = ext4_group_add(sb, input);
752 if (EXT4_SB(sb)->s_journal) {
753 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
754 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
755 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
756 }
757 if (err == 0)
758 err = err2;
759 mnt_drop_write_file(file);
760 if (!err && ext4_has_group_desc_csum(sb) &&
761 test_opt(sb, INIT_INODE_TABLE))
762 err = ext4_register_li_request(sb, input->group);
763group_add_out:
764 ext4_resize_end(sb);
765 return err;
766}
767
768static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
769{
770 struct ext4_inode_info *ei = EXT4_I(inode);
771
772 simple_fill_fsxattr(fa, ext4_iflags_to_xflags(ei->i_flags &
773 EXT4_FL_USER_VISIBLE));
774
775 if (ext4_has_feature_project(inode->i_sb))
776 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
777}
778
779/* So that the fiemap access checks can't overflow on 32 bit machines. */
780#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
781
782static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
783{
784 struct fiemap fiemap;
785 struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
786 struct fiemap_extent_info fieinfo = { 0, };
787 struct inode *inode = file_inode(filp);
788 int error;
789
790 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
791 return -EFAULT;
792
793 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
794 return -EINVAL;
795
796 fieinfo.fi_flags = fiemap.fm_flags;
797 fieinfo.fi_extents_max = fiemap.fm_extent_count;
798 fieinfo.fi_extents_start = ufiemap->fm_extents;
799
800 error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
801 fiemap.fm_length);
802 fiemap.fm_flags = fieinfo.fi_flags;
803 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
804 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
805 error = -EFAULT;
806
807 return error;
808}
809
810long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
811{
812 struct inode *inode = file_inode(filp);
813 struct super_block *sb = inode->i_sb;
814 struct ext4_inode_info *ei = EXT4_I(inode);
815 unsigned int flags;
816
817 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
818
819 switch (cmd) {
820 case FS_IOC_GETFSMAP:
821 return ext4_ioc_getfsmap(sb, (void __user *)arg);
822 case FS_IOC_GETFLAGS:
823 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
824 if (S_ISREG(inode->i_mode))
825 flags &= ~EXT4_PROJINHERIT_FL;
826 return put_user(flags, (int __user *) arg);
827 case FS_IOC_SETFLAGS: {
828 int err;
829
830 if (!inode_owner_or_capable(inode))
831 return -EACCES;
832
833 if (get_user(flags, (int __user *) arg))
834 return -EFAULT;
835
836 if (flags & ~EXT4_FL_USER_VISIBLE)
837 return -EOPNOTSUPP;
838 /*
839 * chattr(1) grabs flags via GETFLAGS, modifies the result and
840 * passes that to SETFLAGS. So we cannot easily make SETFLAGS
841 * more restrictive than just silently masking off visible but
842 * not settable flags as we always did.
843 */
844 flags &= EXT4_FL_USER_MODIFIABLE;
845 if (ext4_mask_flags(inode->i_mode, flags) != flags)
846 return -EOPNOTSUPP;
847
848 err = mnt_want_write_file(filp);
849 if (err)
850 return err;
851
852 inode_lock(inode);
853 err = ext4_ioctl_check_immutable(inode,
854 from_kprojid(&init_user_ns, ei->i_projid),
855 flags);
856 if (!err)
857 err = ext4_ioctl_setflags(inode, flags);
858 inode_unlock(inode);
859 mnt_drop_write_file(filp);
860 return err;
861 }
862 case EXT4_IOC_GETVERSION:
863 case EXT4_IOC_GETVERSION_OLD:
864 return put_user(inode->i_generation, (int __user *) arg);
865 case EXT4_IOC_SETVERSION:
866 case EXT4_IOC_SETVERSION_OLD: {
867 handle_t *handle;
868 struct ext4_iloc iloc;
869 __u32 generation;
870 int err;
871
872 if (!inode_owner_or_capable(inode))
873 return -EPERM;
874
875 if (ext4_has_metadata_csum(inode->i_sb)) {
876 ext4_warning(sb, "Setting inode version is not "
877 "supported with metadata_csum enabled.");
878 return -ENOTTY;
879 }
880
881 err = mnt_want_write_file(filp);
882 if (err)
883 return err;
884 if (get_user(generation, (int __user *) arg)) {
885 err = -EFAULT;
886 goto setversion_out;
887 }
888
889 inode_lock(inode);
890 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
891 if (IS_ERR(handle)) {
892 err = PTR_ERR(handle);
893 goto unlock_out;
894 }
895 err = ext4_reserve_inode_write(handle, inode, &iloc);
896 if (err == 0) {
897 inode->i_ctime = current_time(inode);
898 inode->i_generation = generation;
899 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
900 }
901 ext4_journal_stop(handle);
902
903unlock_out:
904 inode_unlock(inode);
905setversion_out:
906 mnt_drop_write_file(filp);
907 return err;
908 }
909 case EXT4_IOC_GROUP_EXTEND: {
910 ext4_fsblk_t n_blocks_count;
911 int err, err2=0;
912
913 err = ext4_resize_begin(sb);
914 if (err)
915 return err;
916
917 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
918 err = -EFAULT;
919 goto group_extend_out;
920 }
921
922 if (ext4_has_feature_bigalloc(sb)) {
923 ext4_msg(sb, KERN_ERR,
924 "Online resizing not supported with bigalloc");
925 err = -EOPNOTSUPP;
926 goto group_extend_out;
927 }
928
929 err = mnt_want_write_file(filp);
930 if (err)
931 goto group_extend_out;
932
933 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
934 if (EXT4_SB(sb)->s_journal) {
935 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
936 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
937 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
938 }
939 if (err == 0)
940 err = err2;
941 mnt_drop_write_file(filp);
942group_extend_out:
943 ext4_resize_end(sb);
944 return err;
945 }
946
947 case EXT4_IOC_MOVE_EXT: {
948 struct move_extent me;
949 struct fd donor;
950 int err;
951
952 if (!(filp->f_mode & FMODE_READ) ||
953 !(filp->f_mode & FMODE_WRITE))
954 return -EBADF;
955
956 if (copy_from_user(&me,
957 (struct move_extent __user *)arg, sizeof(me)))
958 return -EFAULT;
959 me.moved_len = 0;
960
961 donor = fdget(me.donor_fd);
962 if (!donor.file)
963 return -EBADF;
964
965 if (!(donor.file->f_mode & FMODE_WRITE)) {
966 err = -EBADF;
967 goto mext_out;
968 }
969
970 if (ext4_has_feature_bigalloc(sb)) {
971 ext4_msg(sb, KERN_ERR,
972 "Online defrag not supported with bigalloc");
973 err = -EOPNOTSUPP;
974 goto mext_out;
975 } else if (IS_DAX(inode)) {
976 ext4_msg(sb, KERN_ERR,
977 "Online defrag not supported with DAX");
978 err = -EOPNOTSUPP;
979 goto mext_out;
980 }
981
982 err = mnt_want_write_file(filp);
983 if (err)
984 goto mext_out;
985
986 err = ext4_move_extents(filp, donor.file, me.orig_start,
987 me.donor_start, me.len, &me.moved_len);
988 mnt_drop_write_file(filp);
989
990 if (copy_to_user((struct move_extent __user *)arg,
991 &me, sizeof(me)))
992 err = -EFAULT;
993mext_out:
994 fdput(donor);
995 return err;
996 }
997
998 case EXT4_IOC_GROUP_ADD: {
999 struct ext4_new_group_data input;
1000
1001 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1002 sizeof(input)))
1003 return -EFAULT;
1004
1005 return ext4_ioctl_group_add(filp, &input);
1006 }
1007
1008 case EXT4_IOC_MIGRATE:
1009 {
1010 int err;
1011 if (!inode_owner_or_capable(inode))
1012 return -EACCES;
1013
1014 err = mnt_want_write_file(filp);
1015 if (err)
1016 return err;
1017 /*
1018 * inode_mutex prevent write and truncate on the file.
1019 * Read still goes through. We take i_data_sem in
1020 * ext4_ext_swap_inode_data before we switch the
1021 * inode format to prevent read.
1022 */
1023 inode_lock((inode));
1024 err = ext4_ext_migrate(inode);
1025 inode_unlock((inode));
1026 mnt_drop_write_file(filp);
1027 return err;
1028 }
1029
1030 case EXT4_IOC_ALLOC_DA_BLKS:
1031 {
1032 int err;
1033 if (!inode_owner_or_capable(inode))
1034 return -EACCES;
1035
1036 err = mnt_want_write_file(filp);
1037 if (err)
1038 return err;
1039 err = ext4_alloc_da_blocks(inode);
1040 mnt_drop_write_file(filp);
1041 return err;
1042 }
1043
1044 case EXT4_IOC_SWAP_BOOT:
1045 {
1046 int err;
1047 if (!(filp->f_mode & FMODE_WRITE))
1048 return -EBADF;
1049 err = mnt_want_write_file(filp);
1050 if (err)
1051 return err;
1052 err = swap_inode_boot_loader(sb, inode);
1053 mnt_drop_write_file(filp);
1054 return err;
1055 }
1056
1057 case EXT4_IOC_RESIZE_FS: {
1058 ext4_fsblk_t n_blocks_count;
1059 int err = 0, err2 = 0;
1060 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1061
1062 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1063 sizeof(__u64))) {
1064 return -EFAULT;
1065 }
1066
1067 err = ext4_resize_begin(sb);
1068 if (err)
1069 return err;
1070
1071 err = mnt_want_write_file(filp);
1072 if (err)
1073 goto resizefs_out;
1074
1075 err = ext4_resize_fs(sb, n_blocks_count);
1076 if (EXT4_SB(sb)->s_journal) {
1077 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1078 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
1079 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1080 }
1081 if (err == 0)
1082 err = err2;
1083 mnt_drop_write_file(filp);
1084 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1085 ext4_has_group_desc_csum(sb) &&
1086 test_opt(sb, INIT_INODE_TABLE))
1087 err = ext4_register_li_request(sb, o_group);
1088
1089resizefs_out:
1090 ext4_resize_end(sb);
1091 return err;
1092 }
1093
1094 case FITRIM:
1095 {
1096 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1097 struct fstrim_range range;
1098 int ret = 0;
1099
1100 if (!capable(CAP_SYS_ADMIN))
1101 return -EPERM;
1102
1103 if (!blk_queue_discard(q))
1104 return -EOPNOTSUPP;
1105
1106 /*
1107 * We haven't replayed the journal, so we cannot use our
1108 * block-bitmap-guided storage zapping commands.
1109 */
1110 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1111 return -EROFS;
1112
1113 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1114 sizeof(range)))
1115 return -EFAULT;
1116
1117 range.minlen = max((unsigned int)range.minlen,
1118 q->limits.discard_granularity);
1119 ret = ext4_trim_fs(sb, &range);
1120 if (ret < 0)
1121 return ret;
1122
1123 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1124 sizeof(range)))
1125 return -EFAULT;
1126
1127 return 0;
1128 }
1129 case EXT4_IOC_PRECACHE_EXTENTS:
1130 return ext4_ext_precache(inode);
1131
1132 case FS_IOC_SET_ENCRYPTION_POLICY:
1133 if (!ext4_has_feature_encrypt(sb))
1134 return -EOPNOTSUPP;
1135 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1136
1137 case FS_IOC_GET_ENCRYPTION_PWSALT: {
1138#ifdef CONFIG_FS_ENCRYPTION
1139 int err, err2;
1140 struct ext4_sb_info *sbi = EXT4_SB(sb);
1141 handle_t *handle;
1142
1143 if (!ext4_has_feature_encrypt(sb))
1144 return -EOPNOTSUPP;
1145 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1146 err = mnt_want_write_file(filp);
1147 if (err)
1148 return err;
1149 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1150 if (IS_ERR(handle)) {
1151 err = PTR_ERR(handle);
1152 goto pwsalt_err_exit;
1153 }
1154 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1155 if (err)
1156 goto pwsalt_err_journal;
1157 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1158 err = ext4_handle_dirty_metadata(handle, NULL,
1159 sbi->s_sbh);
1160 pwsalt_err_journal:
1161 err2 = ext4_journal_stop(handle);
1162 if (err2 && !err)
1163 err = err2;
1164 pwsalt_err_exit:
1165 mnt_drop_write_file(filp);
1166 if (err)
1167 return err;
1168 }
1169 if (copy_to_user((void __user *) arg,
1170 sbi->s_es->s_encrypt_pw_salt, 16))
1171 return -EFAULT;
1172 return 0;
1173#else
1174 return -EOPNOTSUPP;
1175#endif
1176 }
1177 case FS_IOC_GET_ENCRYPTION_POLICY:
1178 if (!ext4_has_feature_encrypt(sb))
1179 return -EOPNOTSUPP;
1180 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1181
1182 case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1183 if (!ext4_has_feature_encrypt(sb))
1184 return -EOPNOTSUPP;
1185 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1186
1187 case FS_IOC_ADD_ENCRYPTION_KEY:
1188 if (!ext4_has_feature_encrypt(sb))
1189 return -EOPNOTSUPP;
1190 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1191
1192 case FS_IOC_REMOVE_ENCRYPTION_KEY:
1193 if (!ext4_has_feature_encrypt(sb))
1194 return -EOPNOTSUPP;
1195 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1196
1197 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1198 if (!ext4_has_feature_encrypt(sb))
1199 return -EOPNOTSUPP;
1200 return fscrypt_ioctl_remove_key_all_users(filp,
1201 (void __user *)arg);
1202 case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1203 if (!ext4_has_feature_encrypt(sb))
1204 return -EOPNOTSUPP;
1205 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1206
1207 case FS_IOC_GET_ENCRYPTION_NONCE:
1208 if (!ext4_has_feature_encrypt(sb))
1209 return -EOPNOTSUPP;
1210 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1211
1212 case EXT4_IOC_CLEAR_ES_CACHE:
1213 {
1214 if (!inode_owner_or_capable(inode))
1215 return -EACCES;
1216 ext4_clear_inode_es(inode);
1217 return 0;
1218 }
1219
1220 case EXT4_IOC_GETSTATE:
1221 {
1222 __u32 state = 0;
1223
1224 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1225 state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1226 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1227 state |= EXT4_STATE_FLAG_NEW;
1228 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1229 state |= EXT4_STATE_FLAG_NEWENTRY;
1230 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1231 state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1232
1233 return put_user(state, (__u32 __user *) arg);
1234 }
1235
1236 case EXT4_IOC_GET_ES_CACHE:
1237 return ext4_ioctl_get_es_cache(filp, arg);
1238
1239 case FS_IOC_FSGETXATTR:
1240 {
1241 struct fsxattr fa;
1242
1243 ext4_fill_fsxattr(inode, &fa);
1244
1245 if (copy_to_user((struct fsxattr __user *)arg,
1246 &fa, sizeof(fa)))
1247 return -EFAULT;
1248 return 0;
1249 }
1250 case FS_IOC_FSSETXATTR:
1251 {
1252 struct fsxattr fa, old_fa;
1253 int err;
1254
1255 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1256 sizeof(fa)))
1257 return -EFAULT;
1258
1259 /* Make sure caller has proper permission */
1260 if (!inode_owner_or_capable(inode))
1261 return -EACCES;
1262
1263 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1264 return -EOPNOTSUPP;
1265
1266 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1267 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1268 return -EOPNOTSUPP;
1269
1270 err = mnt_want_write_file(filp);
1271 if (err)
1272 return err;
1273
1274 inode_lock(inode);
1275 ext4_fill_fsxattr(inode, &old_fa);
1276 err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
1277 if (err)
1278 goto out;
1279 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1280 (flags & EXT4_FL_XFLAG_VISIBLE);
1281 err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
1282 if (err)
1283 goto out;
1284 err = ext4_ioctl_setflags(inode, flags);
1285 if (err)
1286 goto out;
1287 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1288out:
1289 inode_unlock(inode);
1290 mnt_drop_write_file(filp);
1291 return err;
1292 }
1293 case EXT4_IOC_SHUTDOWN:
1294 return ext4_shutdown(sb, arg);
1295
1296 case FS_IOC_ENABLE_VERITY:
1297 if (!ext4_has_feature_verity(sb))
1298 return -EOPNOTSUPP;
1299 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1300
1301 case FS_IOC_MEASURE_VERITY:
1302 if (!ext4_has_feature_verity(sb))
1303 return -EOPNOTSUPP;
1304 return fsverity_ioctl_measure(filp, (void __user *)arg);
1305
1306 default:
1307 return -ENOTTY;
1308 }
1309}
1310
1311#ifdef CONFIG_COMPAT
1312long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1313{
1314 /* These are just misnamed, they actually get/put from/to user an int */
1315 switch (cmd) {
1316 case FS_IOC32_GETFLAGS:
1317 cmd = FS_IOC_GETFLAGS;
1318 break;
1319 case FS_IOC32_SETFLAGS:
1320 cmd = FS_IOC_SETFLAGS;
1321 break;
1322 case EXT4_IOC32_GETVERSION:
1323 cmd = EXT4_IOC_GETVERSION;
1324 break;
1325 case EXT4_IOC32_SETVERSION:
1326 cmd = EXT4_IOC_SETVERSION;
1327 break;
1328 case EXT4_IOC32_GROUP_EXTEND:
1329 cmd = EXT4_IOC_GROUP_EXTEND;
1330 break;
1331 case EXT4_IOC32_GETVERSION_OLD:
1332 cmd = EXT4_IOC_GETVERSION_OLD;
1333 break;
1334 case EXT4_IOC32_SETVERSION_OLD:
1335 cmd = EXT4_IOC_SETVERSION_OLD;
1336 break;
1337 case EXT4_IOC32_GETRSVSZ:
1338 cmd = EXT4_IOC_GETRSVSZ;
1339 break;
1340 case EXT4_IOC32_SETRSVSZ:
1341 cmd = EXT4_IOC_SETRSVSZ;
1342 break;
1343 case EXT4_IOC32_GROUP_ADD: {
1344 struct compat_ext4_new_group_input __user *uinput;
1345 struct ext4_new_group_data input;
1346 int err;
1347
1348 uinput = compat_ptr(arg);
1349 err = get_user(input.group, &uinput->group);
1350 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1351 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1352 err |= get_user(input.inode_table, &uinput->inode_table);
1353 err |= get_user(input.blocks_count, &uinput->blocks_count);
1354 err |= get_user(input.reserved_blocks,
1355 &uinput->reserved_blocks);
1356 if (err)
1357 return -EFAULT;
1358 return ext4_ioctl_group_add(file, &input);
1359 }
1360 case EXT4_IOC_MOVE_EXT:
1361 case EXT4_IOC_RESIZE_FS:
1362 case FITRIM:
1363 case EXT4_IOC_PRECACHE_EXTENTS:
1364 case FS_IOC_SET_ENCRYPTION_POLICY:
1365 case FS_IOC_GET_ENCRYPTION_PWSALT:
1366 case FS_IOC_GET_ENCRYPTION_POLICY:
1367 case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1368 case FS_IOC_ADD_ENCRYPTION_KEY:
1369 case FS_IOC_REMOVE_ENCRYPTION_KEY:
1370 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1371 case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1372 case FS_IOC_GET_ENCRYPTION_NONCE:
1373 case EXT4_IOC_SHUTDOWN:
1374 case FS_IOC_GETFSMAP:
1375 case FS_IOC_ENABLE_VERITY:
1376 case FS_IOC_MEASURE_VERITY:
1377 case EXT4_IOC_CLEAR_ES_CACHE:
1378 case EXT4_IOC_GETSTATE:
1379 case EXT4_IOC_GET_ES_CACHE:
1380 case FS_IOC_FSGETXATTR:
1381 case FS_IOC_FSSETXATTR:
1382 break;
1383 default:
1384 return -ENOIOCTLCMD;
1385 }
1386 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1387}
1388#endif