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