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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
31
32
33
34
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
52
53
54
55
56
57
58
59
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
106
107
108
109
110
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
130
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
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
170 ext4_double_down_write_data_sem(inode, inode_bl);
171
172 if (inode_bl->i_nlink == 0) {
173
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);
206
207 err = ext4_mark_inode_dirty(handle, inode);
208 if (err < 0) {
209
210 ext4_warning(inode->i_sb,
211 "couldn't mark inode #%lu dirty (err %d)",
212 inode->i_ino, err);
213
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
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
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
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
274
275
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 int ext4_ioctl_setflags(struct inode *inode,
296 unsigned int flags)
297{
298 struct ext4_inode_info *ei = EXT4_I(inode);
299 handle_t *handle = NULL;
300 int err = -EPERM, migrate = 0;
301 struct ext4_iloc iloc;
302 unsigned int oldflags, mask, i;
303 unsigned int jflag;
304 struct super_block *sb = inode->i_sb;
305
306
307 if (ext4_is_quota_file(inode))
308 goto flags_out;
309
310 oldflags = ei->i_flags;
311
312
313 jflag = flags & EXT4_JOURNAL_DATA_FL;
314
315 err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
316 if (err)
317 goto flags_out;
318
319
320
321
322
323 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
324 if (!capable(CAP_SYS_RESOURCE))
325 goto flags_out;
326 }
327 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
328 migrate = 1;
329
330 if (flags & EXT4_EOFBLOCKS_FL) {
331
332 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
333 err = -EOPNOTSUPP;
334 goto flags_out;
335 }
336 } else if (oldflags & EXT4_EOFBLOCKS_FL) {
337 err = ext4_truncate(inode);
338 if (err)
339 goto flags_out;
340 }
341
342 if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
343 if (!ext4_has_feature_casefold(sb)) {
344 err = -EOPNOTSUPP;
345 goto flags_out;
346 }
347
348 if (!S_ISDIR(inode->i_mode)) {
349 err = -ENOTDIR;
350 goto flags_out;
351 }
352
353 if (!ext4_empty_dir(inode)) {
354 err = -ENOTEMPTY;
355 goto flags_out;
356 }
357 }
358
359
360
361
362
363
364
365 if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
366 (flags & EXT4_IMMUTABLE_FL)) {
367 inode_dio_wait(inode);
368 err = filemap_write_and_wait(inode->i_mapping);
369 if (err)
370 goto flags_out;
371 }
372
373 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
374 if (IS_ERR(handle)) {
375 err = PTR_ERR(handle);
376 goto flags_out;
377 }
378 if (IS_SYNC(inode))
379 ext4_handle_sync(handle);
380 err = ext4_reserve_inode_write(handle, inode, &iloc);
381 if (err)
382 goto flags_err;
383
384 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
385 if (!(mask & EXT4_FL_USER_MODIFIABLE))
386 continue;
387
388 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
389 continue;
390 if (mask & flags)
391 ext4_set_inode_flag(inode, i);
392 else
393 ext4_clear_inode_flag(inode, i);
394 }
395
396 ext4_set_inode_flags(inode);
397 inode->i_ctime = current_time(inode);
398
399 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
400flags_err:
401 ext4_journal_stop(handle);
402 if (err)
403 goto flags_out;
404
405 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
406
407
408
409
410 if (test_opt(inode->i_sb, DAX)) {
411 err = -EBUSY;
412 goto flags_out;
413 }
414
415 err = ext4_change_inode_journal_flag(inode, jflag);
416 if (err)
417 goto flags_out;
418 }
419 if (migrate) {
420 if (flags & EXT4_EXTENTS_FL)
421 err = ext4_ext_migrate(inode);
422 else
423 err = ext4_ind_migrate(inode);
424 }
425
426flags_out:
427 return err;
428}
429
430#ifdef CONFIG_QUOTA
431static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
432{
433 struct inode *inode = file_inode(filp);
434 struct super_block *sb = inode->i_sb;
435 struct ext4_inode_info *ei = EXT4_I(inode);
436 int err, rc;
437 handle_t *handle;
438 kprojid_t kprojid;
439 struct ext4_iloc iloc;
440 struct ext4_inode *raw_inode;
441 struct dquot *transfer_to[MAXQUOTAS] = { };
442
443 if (!ext4_has_feature_project(sb)) {
444 if (projid != EXT4_DEF_PROJID)
445 return -EOPNOTSUPP;
446 else
447 return 0;
448 }
449
450 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
451 return -EOPNOTSUPP;
452
453 kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
454
455 if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
456 return 0;
457
458 err = -EPERM;
459
460 if (ext4_is_quota_file(inode))
461 return err;
462
463 err = ext4_get_inode_loc(inode, &iloc);
464 if (err)
465 return err;
466
467 raw_inode = ext4_raw_inode(&iloc);
468 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
469 err = ext4_expand_extra_isize(inode,
470 EXT4_SB(sb)->s_want_extra_isize,
471 &iloc);
472 if (err)
473 return err;
474 } else {
475 brelse(iloc.bh);
476 }
477
478 err = dquot_initialize(inode);
479 if (err)
480 return err;
481
482 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
483 EXT4_QUOTA_INIT_BLOCKS(sb) +
484 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
485 if (IS_ERR(handle))
486 return PTR_ERR(handle);
487
488 err = ext4_reserve_inode_write(handle, inode, &iloc);
489 if (err)
490 goto out_stop;
491
492 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
493 if (!IS_ERR(transfer_to[PRJQUOTA])) {
494
495
496
497
498 down_read(&EXT4_I(inode)->xattr_sem);
499 err = __dquot_transfer(inode, transfer_to);
500 up_read(&EXT4_I(inode)->xattr_sem);
501 dqput(transfer_to[PRJQUOTA]);
502 if (err)
503 goto out_dirty;
504 }
505
506 EXT4_I(inode)->i_projid = kprojid;
507 inode->i_ctime = current_time(inode);
508out_dirty:
509 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
510 if (!err)
511 err = rc;
512out_stop:
513 ext4_journal_stop(handle);
514 return err;
515}
516#else
517static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
518{
519 if (projid != EXT4_DEF_PROJID)
520 return -EOPNOTSUPP;
521 return 0;
522}
523#endif
524
525
526static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
527{
528 __u32 xflags = 0;
529
530 if (iflags & EXT4_SYNC_FL)
531 xflags |= FS_XFLAG_SYNC;
532 if (iflags & EXT4_IMMUTABLE_FL)
533 xflags |= FS_XFLAG_IMMUTABLE;
534 if (iflags & EXT4_APPEND_FL)
535 xflags |= FS_XFLAG_APPEND;
536 if (iflags & EXT4_NODUMP_FL)
537 xflags |= FS_XFLAG_NODUMP;
538 if (iflags & EXT4_NOATIME_FL)
539 xflags |= FS_XFLAG_NOATIME;
540 if (iflags & EXT4_PROJINHERIT_FL)
541 xflags |= FS_XFLAG_PROJINHERIT;
542 return xflags;
543}
544
545#define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
546 FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
547 FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
548
549
550static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
551{
552 unsigned long iflags = 0;
553
554 if (xflags & FS_XFLAG_SYNC)
555 iflags |= EXT4_SYNC_FL;
556 if (xflags & FS_XFLAG_IMMUTABLE)
557 iflags |= EXT4_IMMUTABLE_FL;
558 if (xflags & FS_XFLAG_APPEND)
559 iflags |= EXT4_APPEND_FL;
560 if (xflags & FS_XFLAG_NODUMP)
561 iflags |= EXT4_NODUMP_FL;
562 if (xflags & FS_XFLAG_NOATIME)
563 iflags |= EXT4_NOATIME_FL;
564 if (xflags & FS_XFLAG_PROJINHERIT)
565 iflags |= EXT4_PROJINHERIT_FL;
566
567 return iflags;
568}
569
570static int ext4_shutdown(struct super_block *sb, unsigned long arg)
571{
572 struct ext4_sb_info *sbi = EXT4_SB(sb);
573 __u32 flags;
574
575 if (!capable(CAP_SYS_ADMIN))
576 return -EPERM;
577
578 if (get_user(flags, (__u32 __user *)arg))
579 return -EFAULT;
580
581 if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
582 return -EINVAL;
583
584 if (ext4_forced_shutdown(sbi))
585 return 0;
586
587 ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
588 trace_ext4_shutdown(sb, flags);
589
590 switch (flags) {
591 case EXT4_GOING_FLAGS_DEFAULT:
592 freeze_bdev(sb->s_bdev);
593 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
594 thaw_bdev(sb->s_bdev, sb);
595 break;
596 case EXT4_GOING_FLAGS_LOGFLUSH:
597 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
598 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
599 (void) ext4_force_commit(sb);
600 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
601 }
602 break;
603 case EXT4_GOING_FLAGS_NOLOGFLUSH:
604 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
605 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
606 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
607 break;
608 default:
609 return -EINVAL;
610 }
611 clear_opt(sb, DISCARD);
612 return 0;
613}
614
615struct getfsmap_info {
616 struct super_block *gi_sb;
617 struct fsmap_head __user *gi_data;
618 unsigned int gi_idx;
619 __u32 gi_last_flags;
620};
621
622static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
623{
624 struct getfsmap_info *info = priv;
625 struct fsmap fm;
626
627 trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
628
629 info->gi_last_flags = xfm->fmr_flags;
630 ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
631 if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
632 sizeof(struct fsmap)))
633 return -EFAULT;
634
635 return 0;
636}
637
638static int ext4_ioc_getfsmap(struct super_block *sb,
639 struct fsmap_head __user *arg)
640{
641 struct getfsmap_info info = { NULL };
642 struct ext4_fsmap_head xhead = {0};
643 struct fsmap_head head;
644 bool aborted = false;
645 int error;
646
647 if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
648 return -EFAULT;
649 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
650 memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
651 sizeof(head.fmh_keys[0].fmr_reserved)) ||
652 memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
653 sizeof(head.fmh_keys[1].fmr_reserved)))
654 return -EINVAL;
655
656
657
658
659 if (head.fmh_keys[0].fmr_offset ||
660 (head.fmh_keys[1].fmr_offset != 0 &&
661 head.fmh_keys[1].fmr_offset != -1ULL))
662 return -EINVAL;
663
664 xhead.fmh_iflags = head.fmh_iflags;
665 xhead.fmh_count = head.fmh_count;
666 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
667 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
668
669 trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
670 trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
671
672 info.gi_sb = sb;
673 info.gi_data = arg;
674 error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
675 if (error == EXT4_QUERY_RANGE_ABORT) {
676 error = 0;
677 aborted = true;
678 } else if (error)
679 return error;
680
681
682 if (!aborted && info.gi_idx) {
683 info.gi_last_flags |= FMR_OF_LAST;
684 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
685 &info.gi_last_flags,
686 sizeof(info.gi_last_flags)))
687 return -EFAULT;
688 }
689
690
691 head.fmh_entries = xhead.fmh_entries;
692 head.fmh_oflags = xhead.fmh_oflags;
693 if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
694 return -EFAULT;
695
696 return 0;
697}
698
699static long ext4_ioctl_group_add(struct file *file,
700 struct ext4_new_group_data *input)
701{
702 struct super_block *sb = file_inode(file)->i_sb;
703 int err, err2=0;
704
705 err = ext4_resize_begin(sb);
706 if (err)
707 return err;
708
709 if (ext4_has_feature_bigalloc(sb)) {
710 ext4_msg(sb, KERN_ERR,
711 "Online resizing not supported with bigalloc");
712 err = -EOPNOTSUPP;
713 goto group_add_out;
714 }
715
716 err = mnt_want_write_file(file);
717 if (err)
718 goto group_add_out;
719
720 err = ext4_group_add(sb, input);
721 if (EXT4_SB(sb)->s_journal) {
722 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
723 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
724 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
725 }
726 if (err == 0)
727 err = err2;
728 mnt_drop_write_file(file);
729 if (!err && ext4_has_group_desc_csum(sb) &&
730 test_opt(sb, INIT_INODE_TABLE))
731 err = ext4_register_li_request(sb, input->group);
732group_add_out:
733 ext4_resize_end(sb);
734 return err;
735}
736
737static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
738{
739 struct ext4_inode_info *ei = EXT4_I(inode);
740
741 simple_fill_fsxattr(fa, ext4_iflags_to_xflags(ei->i_flags &
742 EXT4_FL_USER_VISIBLE));
743
744 if (ext4_has_feature_project(inode->i_sb))
745 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
746}
747
748long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
749{
750 struct inode *inode = file_inode(filp);
751 struct super_block *sb = inode->i_sb;
752 struct ext4_inode_info *ei = EXT4_I(inode);
753 unsigned int flags;
754
755 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
756
757 switch (cmd) {
758 case FS_IOC_GETFSMAP:
759 return ext4_ioc_getfsmap(sb, (void __user *)arg);
760 case EXT4_IOC_GETFLAGS:
761 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
762 if (S_ISREG(inode->i_mode))
763 flags &= ~EXT4_PROJINHERIT_FL;
764 return put_user(flags, (int __user *) arg);
765 case EXT4_IOC_SETFLAGS: {
766 int err;
767
768 if (!inode_owner_or_capable(inode))
769 return -EACCES;
770
771 if (get_user(flags, (int __user *) arg))
772 return -EFAULT;
773
774 if (flags & ~EXT4_FL_USER_VISIBLE)
775 return -EOPNOTSUPP;
776
777
778
779
780
781
782 flags &= EXT4_FL_USER_MODIFIABLE;
783 if (ext4_mask_flags(inode->i_mode, flags) != flags)
784 return -EOPNOTSUPP;
785
786 err = mnt_want_write_file(filp);
787 if (err)
788 return err;
789
790 inode_lock(inode);
791 err = ext4_ioctl_check_immutable(inode,
792 from_kprojid(&init_user_ns, ei->i_projid),
793 flags);
794 if (!err)
795 err = ext4_ioctl_setflags(inode, flags);
796 inode_unlock(inode);
797 mnt_drop_write_file(filp);
798 return err;
799 }
800 case EXT4_IOC_GETVERSION:
801 case EXT4_IOC_GETVERSION_OLD:
802 return put_user(inode->i_generation, (int __user *) arg);
803 case EXT4_IOC_SETVERSION:
804 case EXT4_IOC_SETVERSION_OLD: {
805 handle_t *handle;
806 struct ext4_iloc iloc;
807 __u32 generation;
808 int err;
809
810 if (!inode_owner_or_capable(inode))
811 return -EPERM;
812
813 if (ext4_has_metadata_csum(inode->i_sb)) {
814 ext4_warning(sb, "Setting inode version is not "
815 "supported with metadata_csum enabled.");
816 return -ENOTTY;
817 }
818
819 err = mnt_want_write_file(filp);
820 if (err)
821 return err;
822 if (get_user(generation, (int __user *) arg)) {
823 err = -EFAULT;
824 goto setversion_out;
825 }
826
827 inode_lock(inode);
828 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
829 if (IS_ERR(handle)) {
830 err = PTR_ERR(handle);
831 goto unlock_out;
832 }
833 err = ext4_reserve_inode_write(handle, inode, &iloc);
834 if (err == 0) {
835 inode->i_ctime = current_time(inode);
836 inode->i_generation = generation;
837 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
838 }
839 ext4_journal_stop(handle);
840
841unlock_out:
842 inode_unlock(inode);
843setversion_out:
844 mnt_drop_write_file(filp);
845 return err;
846 }
847 case EXT4_IOC_GROUP_EXTEND: {
848 ext4_fsblk_t n_blocks_count;
849 int err, err2=0;
850
851 err = ext4_resize_begin(sb);
852 if (err)
853 return err;
854
855 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
856 err = -EFAULT;
857 goto group_extend_out;
858 }
859
860 if (ext4_has_feature_bigalloc(sb)) {
861 ext4_msg(sb, KERN_ERR,
862 "Online resizing not supported with bigalloc");
863 err = -EOPNOTSUPP;
864 goto group_extend_out;
865 }
866
867 err = mnt_want_write_file(filp);
868 if (err)
869 goto group_extend_out;
870
871 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
872 if (EXT4_SB(sb)->s_journal) {
873 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
874 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
875 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
876 }
877 if (err == 0)
878 err = err2;
879 mnt_drop_write_file(filp);
880group_extend_out:
881 ext4_resize_end(sb);
882 return err;
883 }
884
885 case EXT4_IOC_MOVE_EXT: {
886 struct move_extent me;
887 struct fd donor;
888 int err;
889
890 if (!(filp->f_mode & FMODE_READ) ||
891 !(filp->f_mode & FMODE_WRITE))
892 return -EBADF;
893
894 if (copy_from_user(&me,
895 (struct move_extent __user *)arg, sizeof(me)))
896 return -EFAULT;
897 me.moved_len = 0;
898
899 donor = fdget(me.donor_fd);
900 if (!donor.file)
901 return -EBADF;
902
903 if (!(donor.file->f_mode & FMODE_WRITE)) {
904 err = -EBADF;
905 goto mext_out;
906 }
907
908 if (ext4_has_feature_bigalloc(sb)) {
909 ext4_msg(sb, KERN_ERR,
910 "Online defrag not supported with bigalloc");
911 err = -EOPNOTSUPP;
912 goto mext_out;
913 } else if (IS_DAX(inode)) {
914 ext4_msg(sb, KERN_ERR,
915 "Online defrag not supported with DAX");
916 err = -EOPNOTSUPP;
917 goto mext_out;
918 }
919
920 err = mnt_want_write_file(filp);
921 if (err)
922 goto mext_out;
923
924 err = ext4_move_extents(filp, donor.file, me.orig_start,
925 me.donor_start, me.len, &me.moved_len);
926 mnt_drop_write_file(filp);
927
928 if (copy_to_user((struct move_extent __user *)arg,
929 &me, sizeof(me)))
930 err = -EFAULT;
931mext_out:
932 fdput(donor);
933 return err;
934 }
935
936 case EXT4_IOC_GROUP_ADD: {
937 struct ext4_new_group_data input;
938
939 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
940 sizeof(input)))
941 return -EFAULT;
942
943 return ext4_ioctl_group_add(filp, &input);
944 }
945
946 case EXT4_IOC_MIGRATE:
947 {
948 int err;
949 if (!inode_owner_or_capable(inode))
950 return -EACCES;
951
952 err = mnt_want_write_file(filp);
953 if (err)
954 return err;
955
956
957
958
959
960
961 inode_lock((inode));
962 err = ext4_ext_migrate(inode);
963 inode_unlock((inode));
964 mnt_drop_write_file(filp);
965 return err;
966 }
967
968 case EXT4_IOC_ALLOC_DA_BLKS:
969 {
970 int err;
971 if (!inode_owner_or_capable(inode))
972 return -EACCES;
973
974 err = mnt_want_write_file(filp);
975 if (err)
976 return err;
977 err = ext4_alloc_da_blocks(inode);
978 mnt_drop_write_file(filp);
979 return err;
980 }
981
982 case EXT4_IOC_SWAP_BOOT:
983 {
984 int err;
985 if (!(filp->f_mode & FMODE_WRITE))
986 return -EBADF;
987 err = mnt_want_write_file(filp);
988 if (err)
989 return err;
990 err = swap_inode_boot_loader(sb, inode);
991 mnt_drop_write_file(filp);
992 return err;
993 }
994
995 case EXT4_IOC_RESIZE_FS: {
996 ext4_fsblk_t n_blocks_count;
997 int err = 0, err2 = 0;
998 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
999
1000 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1001 sizeof(__u64))) {
1002 return -EFAULT;
1003 }
1004
1005 err = ext4_resize_begin(sb);
1006 if (err)
1007 return err;
1008
1009 err = mnt_want_write_file(filp);
1010 if (err)
1011 goto resizefs_out;
1012
1013 err = ext4_resize_fs(sb, n_blocks_count);
1014 if (EXT4_SB(sb)->s_journal) {
1015 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1016 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
1017 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1018 }
1019 if (err == 0)
1020 err = err2;
1021 mnt_drop_write_file(filp);
1022 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1023 ext4_has_group_desc_csum(sb) &&
1024 test_opt(sb, INIT_INODE_TABLE))
1025 err = ext4_register_li_request(sb, o_group);
1026
1027resizefs_out:
1028 ext4_resize_end(sb);
1029 return err;
1030 }
1031
1032 case FITRIM:
1033 {
1034 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1035 struct fstrim_range range;
1036 int ret = 0;
1037
1038 if (!capable(CAP_SYS_ADMIN))
1039 return -EPERM;
1040
1041 if (!blk_queue_discard(q))
1042 return -EOPNOTSUPP;
1043
1044
1045
1046
1047
1048 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1049 return -EROFS;
1050
1051 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1052 sizeof(range)))
1053 return -EFAULT;
1054
1055 range.minlen = max((unsigned int)range.minlen,
1056 q->limits.discard_granularity);
1057 ret = ext4_trim_fs(sb, &range);
1058 if (ret < 0)
1059 return ret;
1060
1061 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1062 sizeof(range)))
1063 return -EFAULT;
1064
1065 return 0;
1066 }
1067 case EXT4_IOC_PRECACHE_EXTENTS:
1068 return ext4_ext_precache(inode);
1069
1070 case EXT4_IOC_SET_ENCRYPTION_POLICY:
1071 if (!ext4_has_feature_encrypt(sb))
1072 return -EOPNOTSUPP;
1073 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1074
1075 case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
1076#ifdef CONFIG_FS_ENCRYPTION
1077 int err, err2;
1078 struct ext4_sb_info *sbi = EXT4_SB(sb);
1079 handle_t *handle;
1080
1081 if (!ext4_has_feature_encrypt(sb))
1082 return -EOPNOTSUPP;
1083 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1084 err = mnt_want_write_file(filp);
1085 if (err)
1086 return err;
1087 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1088 if (IS_ERR(handle)) {
1089 err = PTR_ERR(handle);
1090 goto pwsalt_err_exit;
1091 }
1092 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1093 if (err)
1094 goto pwsalt_err_journal;
1095 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1096 err = ext4_handle_dirty_metadata(handle, NULL,
1097 sbi->s_sbh);
1098 pwsalt_err_journal:
1099 err2 = ext4_journal_stop(handle);
1100 if (err2 && !err)
1101 err = err2;
1102 pwsalt_err_exit:
1103 mnt_drop_write_file(filp);
1104 if (err)
1105 return err;
1106 }
1107 if (copy_to_user((void __user *) arg,
1108 sbi->s_es->s_encrypt_pw_salt, 16))
1109 return -EFAULT;
1110 return 0;
1111#else
1112 return -EOPNOTSUPP;
1113#endif
1114 }
1115 case EXT4_IOC_GET_ENCRYPTION_POLICY:
1116 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1117
1118 case EXT4_IOC_FSGETXATTR:
1119 {
1120 struct fsxattr fa;
1121
1122 ext4_fill_fsxattr(inode, &fa);
1123
1124 if (copy_to_user((struct fsxattr __user *)arg,
1125 &fa, sizeof(fa)))
1126 return -EFAULT;
1127 return 0;
1128 }
1129 case EXT4_IOC_FSSETXATTR:
1130 {
1131 struct fsxattr fa, old_fa;
1132 int err;
1133
1134 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1135 sizeof(fa)))
1136 return -EFAULT;
1137
1138
1139 if (!inode_owner_or_capable(inode))
1140 return -EACCES;
1141
1142 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1143 return -EOPNOTSUPP;
1144
1145 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1146 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1147 return -EOPNOTSUPP;
1148
1149 err = mnt_want_write_file(filp);
1150 if (err)
1151 return err;
1152
1153 inode_lock(inode);
1154 ext4_fill_fsxattr(inode, &old_fa);
1155 err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
1156 if (err)
1157 goto out;
1158 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1159 (flags & EXT4_FL_XFLAG_VISIBLE);
1160 err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
1161 if (err)
1162 goto out;
1163 err = ext4_ioctl_setflags(inode, flags);
1164 if (err)
1165 goto out;
1166 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1167out:
1168 inode_unlock(inode);
1169 mnt_drop_write_file(filp);
1170 return err;
1171 }
1172 case EXT4_IOC_SHUTDOWN:
1173 return ext4_shutdown(sb, arg);
1174 default:
1175 return -ENOTTY;
1176 }
1177}
1178
1179#ifdef CONFIG_COMPAT
1180long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1181{
1182
1183 switch (cmd) {
1184 case EXT4_IOC32_GETFLAGS:
1185 cmd = EXT4_IOC_GETFLAGS;
1186 break;
1187 case EXT4_IOC32_SETFLAGS:
1188 cmd = EXT4_IOC_SETFLAGS;
1189 break;
1190 case EXT4_IOC32_GETVERSION:
1191 cmd = EXT4_IOC_GETVERSION;
1192 break;
1193 case EXT4_IOC32_SETVERSION:
1194 cmd = EXT4_IOC_SETVERSION;
1195 break;
1196 case EXT4_IOC32_GROUP_EXTEND:
1197 cmd = EXT4_IOC_GROUP_EXTEND;
1198 break;
1199 case EXT4_IOC32_GETVERSION_OLD:
1200 cmd = EXT4_IOC_GETVERSION_OLD;
1201 break;
1202 case EXT4_IOC32_SETVERSION_OLD:
1203 cmd = EXT4_IOC_SETVERSION_OLD;
1204 break;
1205 case EXT4_IOC32_GETRSVSZ:
1206 cmd = EXT4_IOC_GETRSVSZ;
1207 break;
1208 case EXT4_IOC32_SETRSVSZ:
1209 cmd = EXT4_IOC_SETRSVSZ;
1210 break;
1211 case EXT4_IOC32_GROUP_ADD: {
1212 struct compat_ext4_new_group_input __user *uinput;
1213 struct ext4_new_group_data input;
1214 int err;
1215
1216 uinput = compat_ptr(arg);
1217 err = get_user(input.group, &uinput->group);
1218 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1219 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1220 err |= get_user(input.inode_table, &uinput->inode_table);
1221 err |= get_user(input.blocks_count, &uinput->blocks_count);
1222 err |= get_user(input.reserved_blocks,
1223 &uinput->reserved_blocks);
1224 if (err)
1225 return -EFAULT;
1226 return ext4_ioctl_group_add(file, &input);
1227 }
1228 case EXT4_IOC_MOVE_EXT:
1229 case EXT4_IOC_RESIZE_FS:
1230 case EXT4_IOC_PRECACHE_EXTENTS:
1231 case EXT4_IOC_SET_ENCRYPTION_POLICY:
1232 case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1233 case EXT4_IOC_GET_ENCRYPTION_POLICY:
1234 case EXT4_IOC_SHUTDOWN:
1235 case FS_IOC_GETFSMAP:
1236 break;
1237 default:
1238 return -ENOIOCTLCMD;
1239 }
1240 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1241}
1242#endif
1243
