Merge tag 'hyperv-next-signed-20240320' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / fs / ext4 / ioctl.c
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
30 typedef 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  */
37 static 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  */
49 static void ext4_sb_setuuid(struct ext4_super_block *es, const void *arg)
50 {
51         memcpy(es->s_uuid, (__u8 *)arg, UUID_SIZE);
52 }
53
54 static
55 int 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);
89 out_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  */
103 static 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 (handle) {
159                 err = ext4_handle_dirty_metadata(handle, NULL, bh);
160                 if (err)
161                         goto out_bh;
162         } else {
163                 BUFFER_TRACE(bh, "marking dirty");
164                 mark_buffer_dirty(bh);
165         }
166         err = sync_dirty_buffer(bh);
167
168 out_bh:
169         brelse(bh);
170         ext4_std_error(sb, err);
171         return (err) ? err : 1;
172 }
173
174 /*
175  * Update primary and backup superblocks using the provided function
176  * func and argument arg.
177  *
178  * Only the primary superblock and at most two backup superblock
179  * modifications are journalled; the rest is modified without journal.
180  * This is safe because e2fsck will re-write them if there is a problem,
181  * and we're very unlikely to ever need more than two backups.
182  */
183 static
184 int ext4_update_superblocks_fn(struct super_block *sb,
185                                ext4_update_sb_callback func,
186                                const void *arg)
187 {
188         handle_t *handle;
189         ext4_group_t ngroups;
190         unsigned int three = 1;
191         unsigned int five = 5;
192         unsigned int seven = 7;
193         int err = 0, ret, i;
194         ext4_group_t grp, primary_grp;
195         struct ext4_sb_info *sbi = EXT4_SB(sb);
196
197         /*
198          * We can't update superblocks while the online resize is running
199          */
200         if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
201                                   &sbi->s_ext4_flags)) {
202                 ext4_msg(sb, KERN_ERR, "Can't modify superblock while"
203                          "performing online resize");
204                 return -EBUSY;
205         }
206
207         /*
208          * We're only going to update primary superblock and two
209          * backup superblocks in this transaction.
210          */
211         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3);
212         if (IS_ERR(handle)) {
213                 err = PTR_ERR(handle);
214                 goto out;
215         }
216
217         /* Update primary superblock */
218         err = ext4_update_primary_sb(sb, handle, func, arg);
219         if (err) {
220                 ext4_msg(sb, KERN_ERR, "Failed to update primary "
221                          "superblock");
222                 goto out_journal;
223         }
224
225         primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr);
226         ngroups = ext4_get_groups_count(sb);
227
228         /*
229          * Update backup superblocks. We have to start from group 0
230          * because it might not be where the primary superblock is
231          * if the fs is mounted with -o sb=<backup_sb_block>
232          */
233         i = 0;
234         grp = 0;
235         while (grp < ngroups) {
236                 /* Skip primary superblock */
237                 if (grp == primary_grp)
238                         goto next_grp;
239
240                 ret = ext4_update_backup_sb(sb, handle, grp, func, arg);
241                 if (ret < 0) {
242                         /* Ignore bad checksum; try to update next sb */
243                         if (ret == -EFSBADCRC)
244                                 goto next_grp;
245                         err = ret;
246                         goto out_journal;
247                 }
248
249                 i += ret;
250                 if (handle && i > 1) {
251                         /*
252                          * We're only journalling primary superblock and
253                          * two backup superblocks; the rest is not
254                          * journalled.
255                          */
256                         err = ext4_journal_stop(handle);
257                         if (err)
258                                 goto out;
259                         handle = NULL;
260                 }
261 next_grp:
262                 grp = ext4_list_backups(sb, &three, &five, &seven);
263         }
264
265 out_journal:
266         if (handle) {
267                 ret = ext4_journal_stop(handle);
268                 if (ret && !err)
269                         err = ret;
270         }
271 out:
272         clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags);
273         smp_mb__after_atomic();
274         return err ? err : 0;
275 }
276
277 /*
278  * Swap memory between @a and @b for @len bytes.
279  *
280  * @a:          pointer to first memory area
281  * @b:          pointer to second memory area
282  * @len:        number of bytes to swap
283  *
284  */
285 static void memswap(void *a, void *b, size_t len)
286 {
287         unsigned char *ap, *bp;
288
289         ap = (unsigned char *)a;
290         bp = (unsigned char *)b;
291         while (len-- > 0) {
292                 swap(*ap, *bp);
293                 ap++;
294                 bp++;
295         }
296 }
297
298 /*
299  * Swap i_data and associated attributes between @inode1 and @inode2.
300  * This function is used for the primary swap between inode1 and inode2
301  * and also to revert this primary swap in case of errors.
302  *
303  * Therefore you have to make sure, that calling this method twice
304  * will revert all changes.
305  *
306  * @inode1:     pointer to first inode
307  * @inode2:     pointer to second inode
308  */
309 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
310 {
311         loff_t isize;
312         struct ext4_inode_info *ei1;
313         struct ext4_inode_info *ei2;
314         unsigned long tmp;
315         struct timespec64 ts1, ts2;
316
317         ei1 = EXT4_I(inode1);
318         ei2 = EXT4_I(inode2);
319
320         swap(inode1->i_version, inode2->i_version);
321
322         ts1 = inode_get_atime(inode1);
323         ts2 = inode_get_atime(inode2);
324         inode_set_atime_to_ts(inode1, ts2);
325         inode_set_atime_to_ts(inode2, ts1);
326
327         ts1 = inode_get_mtime(inode1);
328         ts2 = inode_get_mtime(inode2);
329         inode_set_mtime_to_ts(inode1, ts2);
330         inode_set_mtime_to_ts(inode2, ts1);
331
332         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
333         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
334         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
335                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
336         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
337         swap(ei1->i_disksize, ei2->i_disksize);
338         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
339         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
340
341         isize = i_size_read(inode1);
342         i_size_write(inode1, i_size_read(inode2));
343         i_size_write(inode2, isize);
344 }
345
346 void ext4_reset_inode_seed(struct inode *inode)
347 {
348         struct ext4_inode_info *ei = EXT4_I(inode);
349         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
350         __le32 inum = cpu_to_le32(inode->i_ino);
351         __le32 gen = cpu_to_le32(inode->i_generation);
352         __u32 csum;
353
354         if (!ext4_has_metadata_csum(inode->i_sb))
355                 return;
356
357         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
358         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
359 }
360
361 /*
362  * Swap the information from the given @inode and the inode
363  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
364  * important fields of the inodes.
365  *
366  * @sb:         the super block of the filesystem
367  * @idmap:      idmap of the mount the inode was found from
368  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
369  *
370  */
371 static long swap_inode_boot_loader(struct super_block *sb,
372                                 struct mnt_idmap *idmap,
373                                 struct inode *inode)
374 {
375         handle_t *handle;
376         int err;
377         struct inode *inode_bl;
378         struct ext4_inode_info *ei_bl;
379         qsize_t size, size_bl, diff;
380         blkcnt_t blocks;
381         unsigned short bytes;
382
383         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO,
384                         EXT4_IGET_SPECIAL | EXT4_IGET_BAD);
385         if (IS_ERR(inode_bl))
386                 return PTR_ERR(inode_bl);
387         ei_bl = EXT4_I(inode_bl);
388
389         /* Protect orig inodes against a truncate and make sure,
390          * that only 1 swap_inode_boot_loader is running. */
391         lock_two_nondirectories(inode, inode_bl);
392
393         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
394             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
395             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
396             ext4_has_inline_data(inode)) {
397                 err = -EINVAL;
398                 goto journal_err_out;
399         }
400
401         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
402             !inode_owner_or_capable(idmap, inode) ||
403             !capable(CAP_SYS_ADMIN)) {
404                 err = -EPERM;
405                 goto journal_err_out;
406         }
407
408         filemap_invalidate_lock(inode->i_mapping);
409         err = filemap_write_and_wait(inode->i_mapping);
410         if (err)
411                 goto err_out;
412
413         err = filemap_write_and_wait(inode_bl->i_mapping);
414         if (err)
415                 goto err_out;
416
417         /* Wait for all existing dio workers */
418         inode_dio_wait(inode);
419         inode_dio_wait(inode_bl);
420
421         truncate_inode_pages(&inode->i_data, 0);
422         truncate_inode_pages(&inode_bl->i_data, 0);
423
424         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
425         if (IS_ERR(handle)) {
426                 err = -EINVAL;
427                 goto err_out;
428         }
429         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle);
430
431         /* Protect extent tree against block allocations via delalloc */
432         ext4_double_down_write_data_sem(inode, inode_bl);
433
434         if (is_bad_inode(inode_bl) || !S_ISREG(inode_bl->i_mode)) {
435                 /* this inode has never been used as a BOOT_LOADER */
436                 set_nlink(inode_bl, 1);
437                 i_uid_write(inode_bl, 0);
438                 i_gid_write(inode_bl, 0);
439                 inode_bl->i_flags = 0;
440                 ei_bl->i_flags = 0;
441                 inode_set_iversion(inode_bl, 1);
442                 i_size_write(inode_bl, 0);
443                 EXT4_I(inode_bl)->i_disksize = inode_bl->i_size;
444                 inode_bl->i_mode = S_IFREG;
445                 if (ext4_has_feature_extents(sb)) {
446                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
447                         ext4_ext_tree_init(handle, inode_bl);
448                 } else
449                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
450         }
451
452         err = dquot_initialize(inode);
453         if (err)
454                 goto err_out1;
455
456         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
457         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
458         diff = size - size_bl;
459         swap_inode_data(inode, inode_bl);
460
461         inode_set_ctime_current(inode);
462         inode_set_ctime_current(inode_bl);
463         inode_inc_iversion(inode);
464
465         inode->i_generation = get_random_u32();
466         inode_bl->i_generation = get_random_u32();
467         ext4_reset_inode_seed(inode);
468         ext4_reset_inode_seed(inode_bl);
469
470         ext4_discard_preallocations(inode);
471
472         err = ext4_mark_inode_dirty(handle, inode);
473         if (err < 0) {
474                 /* No need to update quota information. */
475                 ext4_warning(inode->i_sb,
476                         "couldn't mark inode #%lu dirty (err %d)",
477                         inode->i_ino, err);
478                 /* Revert all changes: */
479                 swap_inode_data(inode, inode_bl);
480                 ext4_mark_inode_dirty(handle, inode);
481                 goto err_out1;
482         }
483
484         blocks = inode_bl->i_blocks;
485         bytes = inode_bl->i_bytes;
486         inode_bl->i_blocks = inode->i_blocks;
487         inode_bl->i_bytes = inode->i_bytes;
488         err = ext4_mark_inode_dirty(handle, inode_bl);
489         if (err < 0) {
490                 /* No need to update quota information. */
491                 ext4_warning(inode_bl->i_sb,
492                         "couldn't mark inode #%lu dirty (err %d)",
493                         inode_bl->i_ino, err);
494                 goto revert;
495         }
496
497         /* Bootloader inode should not be counted into quota information. */
498         if (diff > 0)
499                 dquot_free_space(inode, diff);
500         else
501                 err = dquot_alloc_space(inode, -1 * diff);
502
503         if (err < 0) {
504 revert:
505                 /* Revert all changes: */
506                 inode_bl->i_blocks = blocks;
507                 inode_bl->i_bytes = bytes;
508                 swap_inode_data(inode, inode_bl);
509                 ext4_mark_inode_dirty(handle, inode);
510                 ext4_mark_inode_dirty(handle, inode_bl);
511         }
512
513 err_out1:
514         ext4_journal_stop(handle);
515         ext4_double_up_write_data_sem(inode, inode_bl);
516
517 err_out:
518         filemap_invalidate_unlock(inode->i_mapping);
519 journal_err_out:
520         unlock_two_nondirectories(inode, inode_bl);
521         iput(inode_bl);
522         return err;
523 }
524
525 /*
526  * If immutable is set and we are not clearing it, we're not allowed to change
527  * anything else in the inode.  Don't error out if we're only trying to set
528  * immutable on an immutable file.
529  */
530 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
531                                       unsigned int flags)
532 {
533         struct ext4_inode_info *ei = EXT4_I(inode);
534         unsigned int oldflags = ei->i_flags;
535
536         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
537                 return 0;
538
539         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
540                 return -EPERM;
541         if (ext4_has_feature_project(inode->i_sb) &&
542             __kprojid_val(ei->i_projid) != new_projid)
543                 return -EPERM;
544
545         return 0;
546 }
547
548 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
549 {
550         struct ext4_inode_info *ei = EXT4_I(inode);
551
552         if (S_ISDIR(inode->i_mode))
553                 return;
554
555         if (test_opt2(inode->i_sb, DAX_NEVER) ||
556             test_opt(inode->i_sb, DAX_ALWAYS))
557                 return;
558
559         if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
560                 d_mark_dontcache(inode);
561 }
562
563 static bool dax_compatible(struct inode *inode, unsigned int oldflags,
564                            unsigned int flags)
565 {
566         /* Allow the DAX flag to be changed on inline directories */
567         if (S_ISDIR(inode->i_mode)) {
568                 flags &= ~EXT4_INLINE_DATA_FL;
569                 oldflags &= ~EXT4_INLINE_DATA_FL;
570         }
571
572         if (flags & EXT4_DAX_FL) {
573                 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
574                      ext4_test_inode_state(inode,
575                                           EXT4_STATE_VERITY_IN_PROGRESS)) {
576                         return false;
577                 }
578         }
579
580         if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
581                         return false;
582
583         return true;
584 }
585
586 static int ext4_ioctl_setflags(struct inode *inode,
587                                unsigned int flags)
588 {
589         struct ext4_inode_info *ei = EXT4_I(inode);
590         handle_t *handle = NULL;
591         int err = -EPERM, migrate = 0;
592         struct ext4_iloc iloc;
593         unsigned int oldflags, mask, i;
594         struct super_block *sb = inode->i_sb;
595
596         /* Is it quota file? Do not allow user to mess with it */
597         if (ext4_is_quota_file(inode))
598                 goto flags_out;
599
600         oldflags = ei->i_flags;
601         /*
602          * The JOURNAL_DATA flag can only be changed by
603          * the relevant capability.
604          */
605         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
606                 if (!capable(CAP_SYS_RESOURCE))
607                         goto flags_out;
608         }
609
610         if (!dax_compatible(inode, oldflags, flags)) {
611                 err = -EOPNOTSUPP;
612                 goto flags_out;
613         }
614
615         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
616                 migrate = 1;
617
618         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
619                 if (!ext4_has_feature_casefold(sb)) {
620                         err = -EOPNOTSUPP;
621                         goto flags_out;
622                 }
623
624                 if (!S_ISDIR(inode->i_mode)) {
625                         err = -ENOTDIR;
626                         goto flags_out;
627                 }
628
629                 if (!ext4_empty_dir(inode)) {
630                         err = -ENOTEMPTY;
631                         goto flags_out;
632                 }
633         }
634
635         /*
636          * Wait for all pending directio and then flush all the dirty pages
637          * for this file.  The flush marks all the pages readonly, so any
638          * subsequent attempt to write to the file (particularly mmap pages)
639          * will come through the filesystem and fail.
640          */
641         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
642             (flags & EXT4_IMMUTABLE_FL)) {
643                 inode_dio_wait(inode);
644                 err = filemap_write_and_wait(inode->i_mapping);
645                 if (err)
646                         goto flags_out;
647         }
648
649         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
650         if (IS_ERR(handle)) {
651                 err = PTR_ERR(handle);
652                 goto flags_out;
653         }
654         if (IS_SYNC(inode))
655                 ext4_handle_sync(handle);
656         err = ext4_reserve_inode_write(handle, inode, &iloc);
657         if (err)
658                 goto flags_err;
659
660         ext4_dax_dontcache(inode, flags);
661
662         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
663                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
664                         continue;
665                 /* These flags get special treatment later */
666                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
667                         continue;
668                 if (mask & flags)
669                         ext4_set_inode_flag(inode, i);
670                 else
671                         ext4_clear_inode_flag(inode, i);
672         }
673
674         ext4_set_inode_flags(inode, false);
675
676         inode_set_ctime_current(inode);
677         inode_inc_iversion(inode);
678
679         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
680 flags_err:
681         ext4_journal_stop(handle);
682         if (err)
683                 goto flags_out;
684
685         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
686                 /*
687                  * Changes to the journaling mode can cause unsafe changes to
688                  * S_DAX if the inode is DAX
689                  */
690                 if (IS_DAX(inode)) {
691                         err = -EBUSY;
692                         goto flags_out;
693                 }
694
695                 err = ext4_change_inode_journal_flag(inode,
696                                                      flags & EXT4_JOURNAL_DATA_FL);
697                 if (err)
698                         goto flags_out;
699         }
700         if (migrate) {
701                 if (flags & EXT4_EXTENTS_FL)
702                         err = ext4_ext_migrate(inode);
703                 else
704                         err = ext4_ind_migrate(inode);
705         }
706
707 flags_out:
708         return err;
709 }
710
711 #ifdef CONFIG_QUOTA
712 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
713 {
714         struct super_block *sb = inode->i_sb;
715         struct ext4_inode_info *ei = EXT4_I(inode);
716         int err, rc;
717         handle_t *handle;
718         kprojid_t kprojid;
719         struct ext4_iloc iloc;
720         struct ext4_inode *raw_inode;
721         struct dquot *transfer_to[MAXQUOTAS] = { };
722
723         if (!ext4_has_feature_project(sb)) {
724                 if (projid != EXT4_DEF_PROJID)
725                         return -EOPNOTSUPP;
726                 else
727                         return 0;
728         }
729
730         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
731                 return -EOPNOTSUPP;
732
733         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
734
735         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
736                 return 0;
737
738         err = -EPERM;
739         /* Is it quota file? Do not allow user to mess with it */
740         if (ext4_is_quota_file(inode))
741                 return err;
742
743         err = dquot_initialize(inode);
744         if (err)
745                 return err;
746
747         err = ext4_get_inode_loc(inode, &iloc);
748         if (err)
749                 return err;
750
751         raw_inode = ext4_raw_inode(&iloc);
752         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
753                 err = ext4_expand_extra_isize(inode,
754                                               EXT4_SB(sb)->s_want_extra_isize,
755                                               &iloc);
756                 if (err)
757                         return err;
758         } else {
759                 brelse(iloc.bh);
760         }
761
762         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
763                 EXT4_QUOTA_INIT_BLOCKS(sb) +
764                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
765         if (IS_ERR(handle))
766                 return PTR_ERR(handle);
767
768         err = ext4_reserve_inode_write(handle, inode, &iloc);
769         if (err)
770                 goto out_stop;
771
772         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
773         if (!IS_ERR(transfer_to[PRJQUOTA])) {
774
775                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
776                  * counts xattr inode references.
777                  */
778                 down_read(&EXT4_I(inode)->xattr_sem);
779                 err = __dquot_transfer(inode, transfer_to);
780                 up_read(&EXT4_I(inode)->xattr_sem);
781                 dqput(transfer_to[PRJQUOTA]);
782                 if (err)
783                         goto out_dirty;
784         }
785
786         EXT4_I(inode)->i_projid = kprojid;
787         inode_set_ctime_current(inode);
788         inode_inc_iversion(inode);
789 out_dirty:
790         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
791         if (!err)
792                 err = rc;
793 out_stop:
794         ext4_journal_stop(handle);
795         return err;
796 }
797 #else
798 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
799 {
800         if (projid != EXT4_DEF_PROJID)
801                 return -EOPNOTSUPP;
802         return 0;
803 }
804 #endif
805
806 int ext4_force_shutdown(struct super_block *sb, u32 flags)
807 {
808         struct ext4_sb_info *sbi = EXT4_SB(sb);
809         int ret;
810
811         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
812                 return -EINVAL;
813
814         if (ext4_forced_shutdown(sb))
815                 return 0;
816
817         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
818         trace_ext4_shutdown(sb, flags);
819
820         switch (flags) {
821         case EXT4_GOING_FLAGS_DEFAULT:
822                 ret = bdev_freeze(sb->s_bdev);
823                 if (ret)
824                         return ret;
825                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
826                 bdev_thaw(sb->s_bdev);
827                 break;
828         case EXT4_GOING_FLAGS_LOGFLUSH:
829                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
830                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
831                         (void) ext4_force_commit(sb);
832                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
833                 }
834                 break;
835         case EXT4_GOING_FLAGS_NOLOGFLUSH:
836                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
837                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
838                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
839                 break;
840         default:
841                 return -EINVAL;
842         }
843         clear_opt(sb, DISCARD);
844         return 0;
845 }
846
847 static int ext4_ioctl_shutdown(struct super_block *sb, unsigned long arg)
848 {
849         u32 flags;
850
851         if (!capable(CAP_SYS_ADMIN))
852                 return -EPERM;
853
854         if (get_user(flags, (__u32 __user *)arg))
855                 return -EFAULT;
856
857         return ext4_force_shutdown(sb, flags);
858 }
859
860 struct getfsmap_info {
861         struct super_block      *gi_sb;
862         struct fsmap_head __user *gi_data;
863         unsigned int            gi_idx;
864         __u32                   gi_last_flags;
865 };
866
867 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
868 {
869         struct getfsmap_info *info = priv;
870         struct fsmap fm;
871
872         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
873
874         info->gi_last_flags = xfm->fmr_flags;
875         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
876         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
877                         sizeof(struct fsmap)))
878                 return -EFAULT;
879
880         return 0;
881 }
882
883 static int ext4_ioc_getfsmap(struct super_block *sb,
884                              struct fsmap_head __user *arg)
885 {
886         struct getfsmap_info info = { NULL };
887         struct ext4_fsmap_head xhead = {0};
888         struct fsmap_head head;
889         bool aborted = false;
890         int error;
891
892         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
893                 return -EFAULT;
894         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
895             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
896                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
897             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
898                        sizeof(head.fmh_keys[1].fmr_reserved)))
899                 return -EINVAL;
900         /*
901          * ext4 doesn't report file extents at all, so the only valid
902          * file offsets are the magic ones (all zeroes or all ones).
903          */
904         if (head.fmh_keys[0].fmr_offset ||
905             (head.fmh_keys[1].fmr_offset != 0 &&
906              head.fmh_keys[1].fmr_offset != -1ULL))
907                 return -EINVAL;
908
909         xhead.fmh_iflags = head.fmh_iflags;
910         xhead.fmh_count = head.fmh_count;
911         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
912         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
913
914         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
915         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
916
917         info.gi_sb = sb;
918         info.gi_data = arg;
919         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
920         if (error == EXT4_QUERY_RANGE_ABORT)
921                 aborted = true;
922         else if (error)
923                 return error;
924
925         /* If we didn't abort, set the "last" flag in the last fmx */
926         if (!aborted && info.gi_idx) {
927                 info.gi_last_flags |= FMR_OF_LAST;
928                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
929                                  &info.gi_last_flags,
930                                  sizeof(info.gi_last_flags)))
931                         return -EFAULT;
932         }
933
934         /* copy back header */
935         head.fmh_entries = xhead.fmh_entries;
936         head.fmh_oflags = xhead.fmh_oflags;
937         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
938                 return -EFAULT;
939
940         return 0;
941 }
942
943 static long ext4_ioctl_group_add(struct file *file,
944                                  struct ext4_new_group_data *input)
945 {
946         struct super_block *sb = file_inode(file)->i_sb;
947         int err, err2=0;
948
949         err = ext4_resize_begin(sb);
950         if (err)
951                 return err;
952
953         if (ext4_has_feature_bigalloc(sb)) {
954                 ext4_msg(sb, KERN_ERR,
955                          "Online resizing not supported with bigalloc");
956                 err = -EOPNOTSUPP;
957                 goto group_add_out;
958         }
959
960         err = mnt_want_write_file(file);
961         if (err)
962                 goto group_add_out;
963
964         err = ext4_group_add(sb, input);
965         if (EXT4_SB(sb)->s_journal) {
966                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
967                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
968                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
969         }
970         if (err == 0)
971                 err = err2;
972         mnt_drop_write_file(file);
973         if (!err && ext4_has_group_desc_csum(sb) &&
974             test_opt(sb, INIT_INODE_TABLE))
975                 err = ext4_register_li_request(sb, input->group);
976 group_add_out:
977         err2 = ext4_resize_end(sb, false);
978         if (err == 0)
979                 err = err2;
980         return err;
981 }
982
983 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
984 {
985         struct inode *inode = d_inode(dentry);
986         struct ext4_inode_info *ei = EXT4_I(inode);
987         u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
988
989         if (S_ISREG(inode->i_mode))
990                 flags &= ~FS_PROJINHERIT_FL;
991
992         fileattr_fill_flags(fa, flags);
993         if (ext4_has_feature_project(inode->i_sb))
994                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
995
996         return 0;
997 }
998
999 int ext4_fileattr_set(struct mnt_idmap *idmap,
1000                       struct dentry *dentry, struct fileattr *fa)
1001 {
1002         struct inode *inode = d_inode(dentry);
1003         u32 flags = fa->flags;
1004         int err = -EOPNOTSUPP;
1005
1006         if (flags & ~EXT4_FL_USER_VISIBLE)
1007                 goto out;
1008
1009         /*
1010          * chattr(1) grabs flags via GETFLAGS, modifies the result and
1011          * passes that to SETFLAGS. So we cannot easily make SETFLAGS
1012          * more restrictive than just silently masking off visible but
1013          * not settable flags as we always did.
1014          */
1015         flags &= EXT4_FL_USER_MODIFIABLE;
1016         if (ext4_mask_flags(inode->i_mode, flags) != flags)
1017                 goto out;
1018         err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
1019         if (err)
1020                 goto out;
1021         err = ext4_ioctl_setflags(inode, flags);
1022         if (err)
1023                 goto out;
1024         err = ext4_ioctl_setproject(inode, fa->fsx_projid);
1025 out:
1026         return err;
1027 }
1028
1029 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1030 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
1031
1032 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
1033 {
1034         struct fiemap fiemap;
1035         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
1036         struct fiemap_extent_info fieinfo = { 0, };
1037         struct inode *inode = file_inode(filp);
1038         int error;
1039
1040         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
1041                 return -EFAULT;
1042
1043         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
1044                 return -EINVAL;
1045
1046         fieinfo.fi_flags = fiemap.fm_flags;
1047         fieinfo.fi_extents_max = fiemap.fm_extent_count;
1048         fieinfo.fi_extents_start = ufiemap->fm_extents;
1049
1050         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
1051                         fiemap.fm_length);
1052         fiemap.fm_flags = fieinfo.fi_flags;
1053         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
1054         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
1055                 error = -EFAULT;
1056
1057         return error;
1058 }
1059
1060 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
1061 {
1062         int err = 0;
1063         __u32 flags = 0;
1064         unsigned int flush_flags = 0;
1065         struct super_block *sb = file_inode(filp)->i_sb;
1066
1067         if (copy_from_user(&flags, (__u32 __user *)arg,
1068                                 sizeof(__u32)))
1069                 return -EFAULT;
1070
1071         if (!capable(CAP_SYS_ADMIN))
1072                 return -EPERM;
1073
1074         /* check for invalid bits set */
1075         if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
1076                                 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1077                                 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
1078                 return -EINVAL;
1079
1080         if (!EXT4_SB(sb)->s_journal)
1081                 return -ENODEV;
1082
1083         if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1084             !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
1085                 return -EOPNOTSUPP;
1086
1087         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
1088                 return 0;
1089
1090         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD)
1091                 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD;
1092
1093         if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) {
1094                 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT;
1095                 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow");
1096         }
1097
1098         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1099         err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags);
1100         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1101
1102         return err;
1103 }
1104
1105 static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label)
1106 {
1107         size_t len;
1108         int ret = 0;
1109         char new_label[EXT4_LABEL_MAX + 1];
1110         struct super_block *sb = file_inode(filp)->i_sb;
1111
1112         if (!capable(CAP_SYS_ADMIN))
1113                 return -EPERM;
1114
1115         /*
1116          * Copy the maximum length allowed for ext4 label with one more to
1117          * find the required terminating null byte in order to test the
1118          * label length. The on disk label doesn't need to be null terminated.
1119          */
1120         if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1))
1121                 return -EFAULT;
1122
1123         len = strnlen(new_label, EXT4_LABEL_MAX + 1);
1124         if (len > EXT4_LABEL_MAX)
1125                 return -EINVAL;
1126
1127         /*
1128          * Clear the buffer after the new label
1129          */
1130         memset(new_label + len, 0, EXT4_LABEL_MAX - len);
1131
1132         ret = mnt_want_write_file(filp);
1133         if (ret)
1134                 return ret;
1135
1136         ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label);
1137
1138         mnt_drop_write_file(filp);
1139         return ret;
1140 }
1141
1142 static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label)
1143 {
1144         char label[EXT4_LABEL_MAX + 1];
1145
1146         /*
1147          * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because
1148          * FSLABEL_MAX must include terminating null byte, while s_volume_name
1149          * does not have to.
1150          */
1151         BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX);
1152
1153         memset(label, 0, sizeof(label));
1154         lock_buffer(sbi->s_sbh);
1155         strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX);
1156         unlock_buffer(sbi->s_sbh);
1157
1158         if (copy_to_user(user_label, label, sizeof(label)))
1159                 return -EFAULT;
1160         return 0;
1161 }
1162
1163 static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi,
1164                         struct fsuuid __user *ufsuuid)
1165 {
1166         struct fsuuid fsuuid;
1167         __u8 uuid[UUID_SIZE];
1168
1169         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1170                 return -EFAULT;
1171
1172         if (fsuuid.fsu_len == 0) {
1173                 fsuuid.fsu_len = UUID_SIZE;
1174                 if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len,
1175                                         sizeof(fsuuid.fsu_len)))
1176                         return -EFAULT;
1177                 return 0;
1178         }
1179
1180         if (fsuuid.fsu_len < UUID_SIZE || fsuuid.fsu_flags != 0)
1181                 return -EINVAL;
1182
1183         lock_buffer(sbi->s_sbh);
1184         memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE);
1185         unlock_buffer(sbi->s_sbh);
1186
1187         fsuuid.fsu_len = UUID_SIZE;
1188         if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid)) ||
1189             copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE))
1190                 return -EFAULT;
1191         return 0;
1192 }
1193
1194 static int ext4_ioctl_setuuid(struct file *filp,
1195                         const struct fsuuid __user *ufsuuid)
1196 {
1197         int ret = 0;
1198         struct super_block *sb = file_inode(filp)->i_sb;
1199         struct fsuuid fsuuid;
1200         __u8 uuid[UUID_SIZE];
1201
1202         if (!capable(CAP_SYS_ADMIN))
1203                 return -EPERM;
1204
1205         /*
1206          * If any checksums (group descriptors or metadata) are being used
1207          * then the checksum seed feature is required to change the UUID.
1208          */
1209         if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb))
1210                         && !ext4_has_feature_csum_seed(sb))
1211                 || ext4_has_feature_stable_inodes(sb))
1212                 return -EOPNOTSUPP;
1213
1214         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1215                 return -EFAULT;
1216
1217         if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
1218                 return -EINVAL;
1219
1220         if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE))
1221                 return -EFAULT;
1222
1223         ret = mnt_want_write_file(filp);
1224         if (ret)
1225                 return ret;
1226
1227         ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid);
1228         mnt_drop_write_file(filp);
1229
1230         return ret;
1231 }
1232
1233 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1234 {
1235         struct inode *inode = file_inode(filp);
1236         struct super_block *sb = inode->i_sb;
1237         struct mnt_idmap *idmap = file_mnt_idmap(filp);
1238
1239         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
1240
1241         switch (cmd) {
1242         case FS_IOC_GETFSMAP:
1243                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
1244         case EXT4_IOC_GETVERSION:
1245         case EXT4_IOC_GETVERSION_OLD:
1246                 return put_user(inode->i_generation, (int __user *) arg);
1247         case EXT4_IOC_SETVERSION:
1248         case EXT4_IOC_SETVERSION_OLD: {
1249                 handle_t *handle;
1250                 struct ext4_iloc iloc;
1251                 __u32 generation;
1252                 int err;
1253
1254                 if (!inode_owner_or_capable(idmap, inode))
1255                         return -EPERM;
1256
1257                 if (ext4_has_metadata_csum(inode->i_sb)) {
1258                         ext4_warning(sb, "Setting inode version is not "
1259                                      "supported with metadata_csum enabled.");
1260                         return -ENOTTY;
1261                 }
1262
1263                 err = mnt_want_write_file(filp);
1264                 if (err)
1265                         return err;
1266                 if (get_user(generation, (int __user *) arg)) {
1267                         err = -EFAULT;
1268                         goto setversion_out;
1269                 }
1270
1271                 inode_lock(inode);
1272                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
1273                 if (IS_ERR(handle)) {
1274                         err = PTR_ERR(handle);
1275                         goto unlock_out;
1276                 }
1277                 err = ext4_reserve_inode_write(handle, inode, &iloc);
1278                 if (err == 0) {
1279                         inode_set_ctime_current(inode);
1280                         inode_inc_iversion(inode);
1281                         inode->i_generation = generation;
1282                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
1283                 }
1284                 ext4_journal_stop(handle);
1285
1286 unlock_out:
1287                 inode_unlock(inode);
1288 setversion_out:
1289                 mnt_drop_write_file(filp);
1290                 return err;
1291         }
1292         case EXT4_IOC_GROUP_EXTEND: {
1293                 ext4_fsblk_t n_blocks_count;
1294                 int err, err2=0;
1295
1296                 err = ext4_resize_begin(sb);
1297                 if (err)
1298                         return err;
1299
1300                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
1301                         err = -EFAULT;
1302                         goto group_extend_out;
1303                 }
1304
1305                 if (ext4_has_feature_bigalloc(sb)) {
1306                         ext4_msg(sb, KERN_ERR,
1307                                  "Online resizing not supported with bigalloc");
1308                         err = -EOPNOTSUPP;
1309                         goto group_extend_out;
1310                 }
1311
1312                 err = mnt_want_write_file(filp);
1313                 if (err)
1314                         goto group_extend_out;
1315
1316                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
1317                 if (EXT4_SB(sb)->s_journal) {
1318                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1319                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1320                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1321                 }
1322                 if (err == 0)
1323                         err = err2;
1324                 mnt_drop_write_file(filp);
1325 group_extend_out:
1326                 err2 = ext4_resize_end(sb, false);
1327                 if (err == 0)
1328                         err = err2;
1329                 return err;
1330         }
1331
1332         case EXT4_IOC_MOVE_EXT: {
1333                 struct move_extent me;
1334                 struct fd donor;
1335                 int err;
1336
1337                 if (!(filp->f_mode & FMODE_READ) ||
1338                     !(filp->f_mode & FMODE_WRITE))
1339                         return -EBADF;
1340
1341                 if (copy_from_user(&me,
1342                         (struct move_extent __user *)arg, sizeof(me)))
1343                         return -EFAULT;
1344                 me.moved_len = 0;
1345
1346                 donor = fdget(me.donor_fd);
1347                 if (!donor.file)
1348                         return -EBADF;
1349
1350                 if (!(donor.file->f_mode & FMODE_WRITE)) {
1351                         err = -EBADF;
1352                         goto mext_out;
1353                 }
1354
1355                 if (ext4_has_feature_bigalloc(sb)) {
1356                         ext4_msg(sb, KERN_ERR,
1357                                  "Online defrag not supported with bigalloc");
1358                         err = -EOPNOTSUPP;
1359                         goto mext_out;
1360                 } else if (IS_DAX(inode)) {
1361                         ext4_msg(sb, KERN_ERR,
1362                                  "Online defrag not supported with DAX");
1363                         err = -EOPNOTSUPP;
1364                         goto mext_out;
1365                 }
1366
1367                 err = mnt_want_write_file(filp);
1368                 if (err)
1369                         goto mext_out;
1370
1371                 err = ext4_move_extents(filp, donor.file, me.orig_start,
1372                                         me.donor_start, me.len, &me.moved_len);
1373                 mnt_drop_write_file(filp);
1374
1375                 if (copy_to_user((struct move_extent __user *)arg,
1376                                  &me, sizeof(me)))
1377                         err = -EFAULT;
1378 mext_out:
1379                 fdput(donor);
1380                 return err;
1381         }
1382
1383         case EXT4_IOC_GROUP_ADD: {
1384                 struct ext4_new_group_data input;
1385
1386                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1387                                 sizeof(input)))
1388                         return -EFAULT;
1389
1390                 return ext4_ioctl_group_add(filp, &input);
1391         }
1392
1393         case EXT4_IOC_MIGRATE:
1394         {
1395                 int err;
1396                 if (!inode_owner_or_capable(idmap, inode))
1397                         return -EACCES;
1398
1399                 err = mnt_want_write_file(filp);
1400                 if (err)
1401                         return err;
1402                 /*
1403                  * inode_mutex prevent write and truncate on the file.
1404                  * Read still goes through. We take i_data_sem in
1405                  * ext4_ext_swap_inode_data before we switch the
1406                  * inode format to prevent read.
1407                  */
1408                 inode_lock((inode));
1409                 err = ext4_ext_migrate(inode);
1410                 inode_unlock((inode));
1411                 mnt_drop_write_file(filp);
1412                 return err;
1413         }
1414
1415         case EXT4_IOC_ALLOC_DA_BLKS:
1416         {
1417                 int err;
1418                 if (!inode_owner_or_capable(idmap, inode))
1419                         return -EACCES;
1420
1421                 err = mnt_want_write_file(filp);
1422                 if (err)
1423                         return err;
1424                 err = ext4_alloc_da_blocks(inode);
1425                 mnt_drop_write_file(filp);
1426                 return err;
1427         }
1428
1429         case EXT4_IOC_SWAP_BOOT:
1430         {
1431                 int err;
1432                 if (!(filp->f_mode & FMODE_WRITE))
1433                         return -EBADF;
1434                 err = mnt_want_write_file(filp);
1435                 if (err)
1436                         return err;
1437                 err = swap_inode_boot_loader(sb, idmap, inode);
1438                 mnt_drop_write_file(filp);
1439                 return err;
1440         }
1441
1442         case EXT4_IOC_RESIZE_FS: {
1443                 ext4_fsblk_t n_blocks_count;
1444                 int err = 0, err2 = 0;
1445                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1446
1447                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1448                                    sizeof(__u64))) {
1449                         return -EFAULT;
1450                 }
1451
1452                 err = ext4_resize_begin(sb);
1453                 if (err)
1454                         return err;
1455
1456                 err = mnt_want_write_file(filp);
1457                 if (err)
1458                         goto resizefs_out;
1459
1460                 err = ext4_resize_fs(sb, n_blocks_count);
1461                 if (EXT4_SB(sb)->s_journal) {
1462                         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL);
1463                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1464                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1465                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1466                 }
1467                 if (err == 0)
1468                         err = err2;
1469                 mnt_drop_write_file(filp);
1470                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1471                     ext4_has_group_desc_csum(sb) &&
1472                     test_opt(sb, INIT_INODE_TABLE))
1473                         err = ext4_register_li_request(sb, o_group);
1474
1475 resizefs_out:
1476                 err2 = ext4_resize_end(sb, true);
1477                 if (err == 0)
1478                         err = err2;
1479                 return err;
1480         }
1481
1482         case FITRIM:
1483         {
1484                 struct fstrim_range range;
1485                 int ret = 0;
1486
1487                 if (!capable(CAP_SYS_ADMIN))
1488                         return -EPERM;
1489
1490                 if (!bdev_max_discard_sectors(sb->s_bdev))
1491                         return -EOPNOTSUPP;
1492
1493                 /*
1494                  * We haven't replayed the journal, so we cannot use our
1495                  * block-bitmap-guided storage zapping commands.
1496                  */
1497                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1498                         return -EROFS;
1499
1500                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1501                     sizeof(range)))
1502                         return -EFAULT;
1503
1504                 ret = ext4_trim_fs(sb, &range);
1505                 if (ret < 0)
1506                         return ret;
1507
1508                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1509                     sizeof(range)))
1510                         return -EFAULT;
1511
1512                 return 0;
1513         }
1514         case EXT4_IOC_PRECACHE_EXTENTS:
1515                 return ext4_ext_precache(inode);
1516
1517         case FS_IOC_SET_ENCRYPTION_POLICY:
1518                 if (!ext4_has_feature_encrypt(sb))
1519                         return -EOPNOTSUPP;
1520                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1521
1522         case FS_IOC_GET_ENCRYPTION_PWSALT:
1523                 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg);
1524
1525         case FS_IOC_GET_ENCRYPTION_POLICY:
1526                 if (!ext4_has_feature_encrypt(sb))
1527                         return -EOPNOTSUPP;
1528                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1529
1530         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1531                 if (!ext4_has_feature_encrypt(sb))
1532                         return -EOPNOTSUPP;
1533                 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1534
1535         case FS_IOC_ADD_ENCRYPTION_KEY:
1536                 if (!ext4_has_feature_encrypt(sb))
1537                         return -EOPNOTSUPP;
1538                 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1539
1540         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1541                 if (!ext4_has_feature_encrypt(sb))
1542                         return -EOPNOTSUPP;
1543                 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1544
1545         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1546                 if (!ext4_has_feature_encrypt(sb))
1547                         return -EOPNOTSUPP;
1548                 return fscrypt_ioctl_remove_key_all_users(filp,
1549                                                           (void __user *)arg);
1550         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1551                 if (!ext4_has_feature_encrypt(sb))
1552                         return -EOPNOTSUPP;
1553                 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1554
1555         case FS_IOC_GET_ENCRYPTION_NONCE:
1556                 if (!ext4_has_feature_encrypt(sb))
1557                         return -EOPNOTSUPP;
1558                 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1559
1560         case EXT4_IOC_CLEAR_ES_CACHE:
1561         {
1562                 if (!inode_owner_or_capable(idmap, inode))
1563                         return -EACCES;
1564                 ext4_clear_inode_es(inode);
1565                 return 0;
1566         }
1567
1568         case EXT4_IOC_GETSTATE:
1569         {
1570                 __u32   state = 0;
1571
1572                 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1573                         state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1574                 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1575                         state |= EXT4_STATE_FLAG_NEW;
1576                 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1577                         state |= EXT4_STATE_FLAG_NEWENTRY;
1578                 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1579                         state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1580
1581                 return put_user(state, (__u32 __user *) arg);
1582         }
1583
1584         case EXT4_IOC_GET_ES_CACHE:
1585                 return ext4_ioctl_get_es_cache(filp, arg);
1586
1587         case EXT4_IOC_SHUTDOWN:
1588                 return ext4_ioctl_shutdown(sb, arg);
1589
1590         case FS_IOC_ENABLE_VERITY:
1591                 if (!ext4_has_feature_verity(sb))
1592                         return -EOPNOTSUPP;
1593                 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1594
1595         case FS_IOC_MEASURE_VERITY:
1596                 if (!ext4_has_feature_verity(sb))
1597                         return -EOPNOTSUPP;
1598                 return fsverity_ioctl_measure(filp, (void __user *)arg);
1599
1600         case FS_IOC_READ_VERITY_METADATA:
1601                 if (!ext4_has_feature_verity(sb))
1602                         return -EOPNOTSUPP;
1603                 return fsverity_ioctl_read_metadata(filp,
1604                                                     (const void __user *)arg);
1605
1606         case EXT4_IOC_CHECKPOINT:
1607                 return ext4_ioctl_checkpoint(filp, arg);
1608
1609         case FS_IOC_GETFSLABEL:
1610                 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg);
1611
1612         case FS_IOC_SETFSLABEL:
1613                 return ext4_ioctl_setlabel(filp,
1614                                            (const void __user *)arg);
1615
1616         case EXT4_IOC_GETFSUUID:
1617                 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg);
1618         case EXT4_IOC_SETFSUUID:
1619                 return ext4_ioctl_setuuid(filp, (const void __user *)arg);
1620         default:
1621                 return -ENOTTY;
1622         }
1623 }
1624
1625 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1626 {
1627         return __ext4_ioctl(filp, cmd, arg);
1628 }
1629
1630 #ifdef CONFIG_COMPAT
1631 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1632 {
1633         /* These are just misnamed, they actually get/put from/to user an int */
1634         switch (cmd) {
1635         case EXT4_IOC32_GETVERSION:
1636                 cmd = EXT4_IOC_GETVERSION;
1637                 break;
1638         case EXT4_IOC32_SETVERSION:
1639                 cmd = EXT4_IOC_SETVERSION;
1640                 break;
1641         case EXT4_IOC32_GROUP_EXTEND:
1642                 cmd = EXT4_IOC_GROUP_EXTEND;
1643                 break;
1644         case EXT4_IOC32_GETVERSION_OLD:
1645                 cmd = EXT4_IOC_GETVERSION_OLD;
1646                 break;
1647         case EXT4_IOC32_SETVERSION_OLD:
1648                 cmd = EXT4_IOC_SETVERSION_OLD;
1649                 break;
1650         case EXT4_IOC32_GETRSVSZ:
1651                 cmd = EXT4_IOC_GETRSVSZ;
1652                 break;
1653         case EXT4_IOC32_SETRSVSZ:
1654                 cmd = EXT4_IOC_SETRSVSZ;
1655                 break;
1656         case EXT4_IOC32_GROUP_ADD: {
1657                 struct compat_ext4_new_group_input __user *uinput;
1658                 struct ext4_new_group_data input;
1659                 int err;
1660
1661                 uinput = compat_ptr(arg);
1662                 err = get_user(input.group, &uinput->group);
1663                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1664                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1665                 err |= get_user(input.inode_table, &uinput->inode_table);
1666                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1667                 err |= get_user(input.reserved_blocks,
1668                                 &uinput->reserved_blocks);
1669                 if (err)
1670                         return -EFAULT;
1671                 return ext4_ioctl_group_add(file, &input);
1672         }
1673         case EXT4_IOC_MOVE_EXT:
1674         case EXT4_IOC_RESIZE_FS:
1675         case FITRIM:
1676         case EXT4_IOC_PRECACHE_EXTENTS:
1677         case FS_IOC_SET_ENCRYPTION_POLICY:
1678         case FS_IOC_GET_ENCRYPTION_PWSALT:
1679         case FS_IOC_GET_ENCRYPTION_POLICY:
1680         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1681         case FS_IOC_ADD_ENCRYPTION_KEY:
1682         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1683         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1684         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1685         case FS_IOC_GET_ENCRYPTION_NONCE:
1686         case EXT4_IOC_SHUTDOWN:
1687         case FS_IOC_GETFSMAP:
1688         case FS_IOC_ENABLE_VERITY:
1689         case FS_IOC_MEASURE_VERITY:
1690         case FS_IOC_READ_VERITY_METADATA:
1691         case EXT4_IOC_CLEAR_ES_CACHE:
1692         case EXT4_IOC_GETSTATE:
1693         case EXT4_IOC_GET_ES_CACHE:
1694         case EXT4_IOC_CHECKPOINT:
1695         case FS_IOC_GETFSLABEL:
1696         case FS_IOC_SETFSLABEL:
1697         case EXT4_IOC_GETFSUUID:
1698         case EXT4_IOC_SETFSUUID:
1699                 break;
1700         default:
1701                 return -ENOIOCTLCMD;
1702         }
1703         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1704 }
1705 #endif
1706
1707 static void set_overhead(struct ext4_super_block *es, const void *arg)
1708 {
1709         es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg));
1710 }
1711
1712 int ext4_update_overhead(struct super_block *sb, bool force)
1713 {
1714         struct ext4_sb_info *sbi = EXT4_SB(sb);
1715
1716         if (sb_rdonly(sb))
1717                 return 0;
1718         if (!force &&
1719             (sbi->s_overhead == 0 ||
1720              sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters)))
1721                 return 0;
1722         return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead);
1723 }