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1/*
2 * linux/fs/ext4/ioctl.c
3 *
4 * Copyright (C) 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 */
9
10#include <linux/fs.h>
11#include <linux/jbd2.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 <asm/uaccess.h>
18#include "ext4_jbd2.h"
19#include "ext4.h"
20
21#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
22
23/**
24 * Swap memory between @a and @b for @len bytes.
25 *
26 * @a: pointer to first memory area
27 * @b: pointer to second memory area
28 * @len: number of bytes to swap
29 *
30 */
31static void memswap(void *a, void *b, size_t len)
32{
33 unsigned char *ap, *bp;
34 unsigned char tmp;
35
36 ap = (unsigned char *)a;
37 bp = (unsigned char *)b;
38 while (len-- > 0) {
39 tmp = *ap;
40 *ap = *bp;
41 *bp = tmp;
42 ap++;
43 bp++;
44 }
45}
46
47/**
48 * Swap i_data and associated attributes between @inode1 and @inode2.
49 * This function is used for the primary swap between inode1 and inode2
50 * and also to revert this primary swap in case of errors.
51 *
52 * Therefore you have to make sure, that calling this method twice
53 * will revert all changes.
54 *
55 * @inode1: pointer to first inode
56 * @inode2: pointer to second inode
57 */
58static void swap_inode_data(struct inode *inode1, struct inode *inode2)
59{
60 loff_t isize;
61 struct ext4_inode_info *ei1;
62 struct ext4_inode_info *ei2;
63
64 ei1 = EXT4_I(inode1);
65 ei2 = EXT4_I(inode2);
66
67 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
68 memswap(&inode1->i_version, &inode2->i_version,
69 sizeof(inode1->i_version));
70 memswap(&inode1->i_blocks, &inode2->i_blocks,
71 sizeof(inode1->i_blocks));
72 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
73 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
74 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
75
76 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
77 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
78 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
79 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
80 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
81 ext4_es_lru_del(inode1);
82 ext4_es_lru_del(inode2);
83
84 isize = i_size_read(inode1);
85 i_size_write(inode1, i_size_read(inode2));
86 i_size_write(inode2, isize);
87}
88
89/**
90 * Swap the information from the given @inode and the inode
91 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
92 * important fields of the inodes.
93 *
94 * @sb: the super block of the filesystem
95 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
96 *
97 */
98static long swap_inode_boot_loader(struct super_block *sb,
99 struct inode *inode)
100{
101 handle_t *handle;
102 int err;
103 struct inode *inode_bl;
104 struct ext4_inode_info *ei_bl;
105 struct ext4_sb_info *sbi = EXT4_SB(sb);
106
107 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
108 return -EINVAL;
109
110 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
111 return -EPERM;
112
113 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
114 if (IS_ERR(inode_bl))
115 return PTR_ERR(inode_bl);
116 ei_bl = EXT4_I(inode_bl);
117
118 filemap_flush(inode->i_mapping);
119 filemap_flush(inode_bl->i_mapping);
120
121 /* Protect orig inodes against a truncate and make sure,
122 * that only 1 swap_inode_boot_loader is running. */
123 lock_two_nondirectories(inode, inode_bl);
124
125 truncate_inode_pages(&inode->i_data, 0);
126 truncate_inode_pages(&inode_bl->i_data, 0);
127
128 /* Wait for all existing dio workers */
129 ext4_inode_block_unlocked_dio(inode);
130 ext4_inode_block_unlocked_dio(inode_bl);
131 inode_dio_wait(inode);
132 inode_dio_wait(inode_bl);
133
134 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
135 if (IS_ERR(handle)) {
136 err = -EINVAL;
137 goto journal_err_out;
138 }
139
140 /* Protect extent tree against block allocations via delalloc */
141 ext4_double_down_write_data_sem(inode, inode_bl);
142
143 if (inode_bl->i_nlink == 0) {
144 /* this inode has never been used as a BOOT_LOADER */
145 set_nlink(inode_bl, 1);
146 i_uid_write(inode_bl, 0);
147 i_gid_write(inode_bl, 0);
148 inode_bl->i_flags = 0;
149 ei_bl->i_flags = 0;
150 inode_bl->i_version = 1;
151 i_size_write(inode_bl, 0);
152 inode_bl->i_mode = S_IFREG;
153 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
154 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
155 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
156 ext4_ext_tree_init(handle, inode_bl);
157 } else
158 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
159 }
160
161 swap_inode_data(inode, inode_bl);
162
163 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
164
165 spin_lock(&sbi->s_next_gen_lock);
166 inode->i_generation = sbi->s_next_generation++;
167 inode_bl->i_generation = sbi->s_next_generation++;
168 spin_unlock(&sbi->s_next_gen_lock);
169
170 ext4_discard_preallocations(inode);
171
172 err = ext4_mark_inode_dirty(handle, inode);
173 if (err < 0) {
174 ext4_warning(inode->i_sb,
175 "couldn't mark inode #%lu dirty (err %d)",
176 inode->i_ino, err);
177 /* Revert all changes: */
178 swap_inode_data(inode, inode_bl);
179 } else {
180 err = ext4_mark_inode_dirty(handle, inode_bl);
181 if (err < 0) {
182 ext4_warning(inode_bl->i_sb,
183 "couldn't mark inode #%lu dirty (err %d)",
184 inode_bl->i_ino, err);
185 /* Revert all changes: */
186 swap_inode_data(inode, inode_bl);
187 ext4_mark_inode_dirty(handle, inode);
188 }
189 }
190 ext4_journal_stop(handle);
191 ext4_double_up_write_data_sem(inode, inode_bl);
192
193journal_err_out:
194 ext4_inode_resume_unlocked_dio(inode);
195 ext4_inode_resume_unlocked_dio(inode_bl);
196 unlock_two_nondirectories(inode, inode_bl);
197 iput(inode_bl);
198 return err;
199}
200
201long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
202{
203 struct inode *inode = file_inode(filp);
204 struct super_block *sb = inode->i_sb;
205 struct ext4_inode_info *ei = EXT4_I(inode);
206 unsigned int flags;
207
208 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
209
210 switch (cmd) {
211 case EXT4_IOC_GETFLAGS:
212 ext4_get_inode_flags(ei);
213 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
214 return put_user(flags, (int __user *) arg);
215 case EXT4_IOC_SETFLAGS: {
216 handle_t *handle = NULL;
217 int err, migrate = 0;
218 struct ext4_iloc iloc;
219 unsigned int oldflags, mask, i;
220 unsigned int jflag;
221
222 if (!inode_owner_or_capable(inode))
223 return -EACCES;
224
225 if (get_user(flags, (int __user *) arg))
226 return -EFAULT;
227
228 err = mnt_want_write_file(filp);
229 if (err)
230 return err;
231
232 flags = ext4_mask_flags(inode->i_mode, flags);
233
234 err = -EPERM;
235 mutex_lock(&inode->i_mutex);
236 /* Is it quota file? Do not allow user to mess with it */
237 if (IS_NOQUOTA(inode))
238 goto flags_out;
239
240 oldflags = ei->i_flags;
241
242 /* The JOURNAL_DATA flag is modifiable only by root */
243 jflag = flags & EXT4_JOURNAL_DATA_FL;
244
245 /*
246 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
247 * the relevant capability.
248 *
249 * This test looks nicer. Thanks to Pauline Middelink
250 */
251 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
252 if (!capable(CAP_LINUX_IMMUTABLE))
253 goto flags_out;
254 }
255
256 /*
257 * The JOURNAL_DATA flag can only be changed by
258 * the relevant capability.
259 */
260 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
261 if (!capable(CAP_SYS_RESOURCE))
262 goto flags_out;
263 }
264 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
265 migrate = 1;
266
267 if (flags & EXT4_EOFBLOCKS_FL) {
268 /* we don't support adding EOFBLOCKS flag */
269 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
270 err = -EOPNOTSUPP;
271 goto flags_out;
272 }
273 } else if (oldflags & EXT4_EOFBLOCKS_FL)
274 ext4_truncate(inode);
275
276 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
277 if (IS_ERR(handle)) {
278 err = PTR_ERR(handle);
279 goto flags_out;
280 }
281 if (IS_SYNC(inode))
282 ext4_handle_sync(handle);
283 err = ext4_reserve_inode_write(handle, inode, &iloc);
284 if (err)
285 goto flags_err;
286
287 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
288 if (!(mask & EXT4_FL_USER_MODIFIABLE))
289 continue;
290 if (mask & flags)
291 ext4_set_inode_flag(inode, i);
292 else
293 ext4_clear_inode_flag(inode, i);
294 }
295
296 ext4_set_inode_flags(inode);
297 inode->i_ctime = ext4_current_time(inode);
298
299 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
300flags_err:
301 ext4_journal_stop(handle);
302 if (err)
303 goto flags_out;
304
305 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
306 err = ext4_change_inode_journal_flag(inode, jflag);
307 if (err)
308 goto flags_out;
309 if (migrate) {
310 if (flags & EXT4_EXTENTS_FL)
311 err = ext4_ext_migrate(inode);
312 else
313 err = ext4_ind_migrate(inode);
314 }
315
316flags_out:
317 mutex_unlock(&inode->i_mutex);
318 mnt_drop_write_file(filp);
319 return err;
320 }
321 case EXT4_IOC_GETVERSION:
322 case EXT4_IOC_GETVERSION_OLD:
323 return put_user(inode->i_generation, (int __user *) arg);
324 case EXT4_IOC_SETVERSION:
325 case EXT4_IOC_SETVERSION_OLD: {
326 handle_t *handle;
327 struct ext4_iloc iloc;
328 __u32 generation;
329 int err;
330
331 if (!inode_owner_or_capable(inode))
332 return -EPERM;
333
334 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
335 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
336 ext4_warning(sb, "Setting inode version is not "
337 "supported with metadata_csum enabled.");
338 return -ENOTTY;
339 }
340
341 err = mnt_want_write_file(filp);
342 if (err)
343 return err;
344 if (get_user(generation, (int __user *) arg)) {
345 err = -EFAULT;
346 goto setversion_out;
347 }
348
349 mutex_lock(&inode->i_mutex);
350 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
351 if (IS_ERR(handle)) {
352 err = PTR_ERR(handle);
353 goto unlock_out;
354 }
355 err = ext4_reserve_inode_write(handle, inode, &iloc);
356 if (err == 0) {
357 inode->i_ctime = ext4_current_time(inode);
358 inode->i_generation = generation;
359 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
360 }
361 ext4_journal_stop(handle);
362
363unlock_out:
364 mutex_unlock(&inode->i_mutex);
365setversion_out:
366 mnt_drop_write_file(filp);
367 return err;
368 }
369 case EXT4_IOC_GROUP_EXTEND: {
370 ext4_fsblk_t n_blocks_count;
371 int err, err2=0;
372
373 err = ext4_resize_begin(sb);
374 if (err)
375 return err;
376
377 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
378 err = -EFAULT;
379 goto group_extend_out;
380 }
381
382 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
383 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
384 ext4_msg(sb, KERN_ERR,
385 "Online resizing not supported with bigalloc");
386 err = -EOPNOTSUPP;
387 goto group_extend_out;
388 }
389
390 err = mnt_want_write_file(filp);
391 if (err)
392 goto group_extend_out;
393
394 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
395 if (EXT4_SB(sb)->s_journal) {
396 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
397 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
398 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
399 }
400 if (err == 0)
401 err = err2;
402 mnt_drop_write_file(filp);
403group_extend_out:
404 ext4_resize_end(sb);
405 return err;
406 }
407
408 case EXT4_IOC_MOVE_EXT: {
409 struct move_extent me;
410 struct fd donor;
411 int err;
412
413 if (!(filp->f_mode & FMODE_READ) ||
414 !(filp->f_mode & FMODE_WRITE))
415 return -EBADF;
416
417 if (copy_from_user(&me,
418 (struct move_extent __user *)arg, sizeof(me)))
419 return -EFAULT;
420 me.moved_len = 0;
421
422 donor = fdget(me.donor_fd);
423 if (!donor.file)
424 return -EBADF;
425
426 if (!(donor.file->f_mode & FMODE_WRITE)) {
427 err = -EBADF;
428 goto mext_out;
429 }
430
431 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
432 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
433 ext4_msg(sb, KERN_ERR,
434 "Online defrag not supported with bigalloc");
435 err = -EOPNOTSUPP;
436 goto mext_out;
437 }
438
439 err = mnt_want_write_file(filp);
440 if (err)
441 goto mext_out;
442
443 err = ext4_move_extents(filp, donor.file, me.orig_start,
444 me.donor_start, me.len, &me.moved_len);
445 mnt_drop_write_file(filp);
446
447 if (copy_to_user((struct move_extent __user *)arg,
448 &me, sizeof(me)))
449 err = -EFAULT;
450mext_out:
451 fdput(donor);
452 return err;
453 }
454
455 case EXT4_IOC_GROUP_ADD: {
456 struct ext4_new_group_data input;
457 int err, err2=0;
458
459 err = ext4_resize_begin(sb);
460 if (err)
461 return err;
462
463 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
464 sizeof(input))) {
465 err = -EFAULT;
466 goto group_add_out;
467 }
468
469 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
470 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
471 ext4_msg(sb, KERN_ERR,
472 "Online resizing not supported with bigalloc");
473 err = -EOPNOTSUPP;
474 goto group_add_out;
475 }
476
477 err = mnt_want_write_file(filp);
478 if (err)
479 goto group_add_out;
480
481 err = ext4_group_add(sb, &input);
482 if (EXT4_SB(sb)->s_journal) {
483 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
484 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
485 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
486 }
487 if (err == 0)
488 err = err2;
489 mnt_drop_write_file(filp);
490 if (!err && ext4_has_group_desc_csum(sb) &&
491 test_opt(sb, INIT_INODE_TABLE))
492 err = ext4_register_li_request(sb, input.group);
493group_add_out:
494 ext4_resize_end(sb);
495 return err;
496 }
497
498 case EXT4_IOC_MIGRATE:
499 {
500 int err;
501 if (!inode_owner_or_capable(inode))
502 return -EACCES;
503
504 err = mnt_want_write_file(filp);
505 if (err)
506 return err;
507 /*
508 * inode_mutex prevent write and truncate on the file.
509 * Read still goes through. We take i_data_sem in
510 * ext4_ext_swap_inode_data before we switch the
511 * inode format to prevent read.
512 */
513 mutex_lock(&(inode->i_mutex));
514 err = ext4_ext_migrate(inode);
515 mutex_unlock(&(inode->i_mutex));
516 mnt_drop_write_file(filp);
517 return err;
518 }
519
520 case EXT4_IOC_ALLOC_DA_BLKS:
521 {
522 int err;
523 if (!inode_owner_or_capable(inode))
524 return -EACCES;
525
526 err = mnt_want_write_file(filp);
527 if (err)
528 return err;
529 err = ext4_alloc_da_blocks(inode);
530 mnt_drop_write_file(filp);
531 return err;
532 }
533
534 case EXT4_IOC_SWAP_BOOT:
535 if (!(filp->f_mode & FMODE_WRITE))
536 return -EBADF;
537 return swap_inode_boot_loader(sb, inode);
538
539 case EXT4_IOC_RESIZE_FS: {
540 ext4_fsblk_t n_blocks_count;
541 int err = 0, err2 = 0;
542 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
543
544 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
545 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
546 ext4_msg(sb, KERN_ERR,
547 "Online resizing not (yet) supported with bigalloc");
548 return -EOPNOTSUPP;
549 }
550
551 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
552 sizeof(__u64))) {
553 return -EFAULT;
554 }
555
556 err = ext4_resize_begin(sb);
557 if (err)
558 return err;
559
560 err = mnt_want_write_file(filp);
561 if (err)
562 goto resizefs_out;
563
564 err = ext4_resize_fs(sb, n_blocks_count);
565 if (EXT4_SB(sb)->s_journal) {
566 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
567 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
568 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
569 }
570 if (err == 0)
571 err = err2;
572 mnt_drop_write_file(filp);
573 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
574 ext4_has_group_desc_csum(sb) &&
575 test_opt(sb, INIT_INODE_TABLE))
576 err = ext4_register_li_request(sb, o_group);
577
578resizefs_out:
579 ext4_resize_end(sb);
580 return err;
581 }
582
583 case FITRIM:
584 {
585 struct request_queue *q = bdev_get_queue(sb->s_bdev);
586 struct fstrim_range range;
587 int ret = 0;
588
589 if (!capable(CAP_SYS_ADMIN))
590 return -EPERM;
591
592 if (!blk_queue_discard(q))
593 return -EOPNOTSUPP;
594
595 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
596 sizeof(range)))
597 return -EFAULT;
598
599 range.minlen = max((unsigned int)range.minlen,
600 q->limits.discard_granularity);
601 ret = ext4_trim_fs(sb, &range);
602 if (ret < 0)
603 return ret;
604
605 if (copy_to_user((struct fstrim_range __user *)arg, &range,
606 sizeof(range)))
607 return -EFAULT;
608
609 return 0;
610 }
611 case EXT4_IOC_PRECACHE_EXTENTS:
612 return ext4_ext_precache(inode);
613
614 default:
615 return -ENOTTY;
616 }
617}
618
619#ifdef CONFIG_COMPAT
620long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
621{
622 /* These are just misnamed, they actually get/put from/to user an int */
623 switch (cmd) {
624 case EXT4_IOC32_GETFLAGS:
625 cmd = EXT4_IOC_GETFLAGS;
626 break;
627 case EXT4_IOC32_SETFLAGS:
628 cmd = EXT4_IOC_SETFLAGS;
629 break;
630 case EXT4_IOC32_GETVERSION:
631 cmd = EXT4_IOC_GETVERSION;
632 break;
633 case EXT4_IOC32_SETVERSION:
634 cmd = EXT4_IOC_SETVERSION;
635 break;
636 case EXT4_IOC32_GROUP_EXTEND:
637 cmd = EXT4_IOC_GROUP_EXTEND;
638 break;
639 case EXT4_IOC32_GETVERSION_OLD:
640 cmd = EXT4_IOC_GETVERSION_OLD;
641 break;
642 case EXT4_IOC32_SETVERSION_OLD:
643 cmd = EXT4_IOC_SETVERSION_OLD;
644 break;
645 case EXT4_IOC32_GETRSVSZ:
646 cmd = EXT4_IOC_GETRSVSZ;
647 break;
648 case EXT4_IOC32_SETRSVSZ:
649 cmd = EXT4_IOC_SETRSVSZ;
650 break;
651 case EXT4_IOC32_GROUP_ADD: {
652 struct compat_ext4_new_group_input __user *uinput;
653 struct ext4_new_group_input input;
654 mm_segment_t old_fs;
655 int err;
656
657 uinput = compat_ptr(arg);
658 err = get_user(input.group, &uinput->group);
659 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
660 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
661 err |= get_user(input.inode_table, &uinput->inode_table);
662 err |= get_user(input.blocks_count, &uinput->blocks_count);
663 err |= get_user(input.reserved_blocks,
664 &uinput->reserved_blocks);
665 if (err)
666 return -EFAULT;
667 old_fs = get_fs();
668 set_fs(KERNEL_DS);
669 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
670 (unsigned long) &input);
671 set_fs(old_fs);
672 return err;
673 }
674 case EXT4_IOC_MOVE_EXT:
675 case FITRIM:
676 case EXT4_IOC_RESIZE_FS:
677 case EXT4_IOC_PRECACHE_EXTENTS:
678 break;
679 default:
680 return -ENOIOCTLCMD;
681 }
682 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
683}
684#endif
1/*
2 * linux/fs/ext4/ioctl.c
3 *
4 * Copyright (C) 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 */
9
10#include <linux/fs.h>
11#include <linux/capability.h>
12#include <linux/time.h>
13#include <linux/compat.h>
14#include <linux/mount.h>
15#include <linux/file.h>
16#include <linux/random.h>
17#include <linux/quotaops.h>
18#include <asm/uaccess.h>
19#include "ext4_jbd2.h"
20#include "ext4.h"
21
22#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
23
24/**
25 * Swap memory between @a and @b for @len bytes.
26 *
27 * @a: pointer to first memory area
28 * @b: pointer to second memory area
29 * @len: number of bytes to swap
30 *
31 */
32static void memswap(void *a, void *b, size_t len)
33{
34 unsigned char *ap, *bp;
35
36 ap = (unsigned char *)a;
37 bp = (unsigned char *)b;
38 while (len-- > 0) {
39 swap(*ap, *bp);
40 ap++;
41 bp++;
42 }
43}
44
45/**
46 * Swap i_data and associated attributes between @inode1 and @inode2.
47 * This function is used for the primary swap between inode1 and inode2
48 * and also to revert this primary swap in case of errors.
49 *
50 * Therefore you have to make sure, that calling this method twice
51 * will revert all changes.
52 *
53 * @inode1: pointer to first inode
54 * @inode2: pointer to second inode
55 */
56static void swap_inode_data(struct inode *inode1, struct inode *inode2)
57{
58 loff_t isize;
59 struct ext4_inode_info *ei1;
60 struct ext4_inode_info *ei2;
61
62 ei1 = EXT4_I(inode1);
63 ei2 = EXT4_I(inode2);
64
65 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
66 memswap(&inode1->i_version, &inode2->i_version,
67 sizeof(inode1->i_version));
68 memswap(&inode1->i_blocks, &inode2->i_blocks,
69 sizeof(inode1->i_blocks));
70 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
71 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
72 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
73
74 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
75 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
76 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
77 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
78 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
79
80 isize = i_size_read(inode1);
81 i_size_write(inode1, i_size_read(inode2));
82 i_size_write(inode2, isize);
83}
84
85/**
86 * Swap the information from the given @inode and the inode
87 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
88 * important fields of the inodes.
89 *
90 * @sb: the super block of the filesystem
91 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
92 *
93 */
94static long swap_inode_boot_loader(struct super_block *sb,
95 struct inode *inode)
96{
97 handle_t *handle;
98 int err;
99 struct inode *inode_bl;
100 struct ext4_inode_info *ei_bl;
101 struct ext4_sb_info *sbi = EXT4_SB(sb);
102
103 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
104 return -EINVAL;
105
106 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
107 return -EPERM;
108
109 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
110 if (IS_ERR(inode_bl))
111 return PTR_ERR(inode_bl);
112 ei_bl = EXT4_I(inode_bl);
113
114 filemap_flush(inode->i_mapping);
115 filemap_flush(inode_bl->i_mapping);
116
117 /* Protect orig inodes against a truncate and make sure,
118 * that only 1 swap_inode_boot_loader is running. */
119 lock_two_nondirectories(inode, inode_bl);
120
121 truncate_inode_pages(&inode->i_data, 0);
122 truncate_inode_pages(&inode_bl->i_data, 0);
123
124 /* Wait for all existing dio workers */
125 ext4_inode_block_unlocked_dio(inode);
126 ext4_inode_block_unlocked_dio(inode_bl);
127 inode_dio_wait(inode);
128 inode_dio_wait(inode_bl);
129
130 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
131 if (IS_ERR(handle)) {
132 err = -EINVAL;
133 goto journal_err_out;
134 }
135
136 /* Protect extent tree against block allocations via delalloc */
137 ext4_double_down_write_data_sem(inode, inode_bl);
138
139 if (inode_bl->i_nlink == 0) {
140 /* this inode has never been used as a BOOT_LOADER */
141 set_nlink(inode_bl, 1);
142 i_uid_write(inode_bl, 0);
143 i_gid_write(inode_bl, 0);
144 inode_bl->i_flags = 0;
145 ei_bl->i_flags = 0;
146 inode_bl->i_version = 1;
147 i_size_write(inode_bl, 0);
148 inode_bl->i_mode = S_IFREG;
149 if (ext4_has_feature_extents(sb)) {
150 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
151 ext4_ext_tree_init(handle, inode_bl);
152 } else
153 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
154 }
155
156 swap_inode_data(inode, inode_bl);
157
158 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
159
160 spin_lock(&sbi->s_next_gen_lock);
161 inode->i_generation = sbi->s_next_generation++;
162 inode_bl->i_generation = sbi->s_next_generation++;
163 spin_unlock(&sbi->s_next_gen_lock);
164
165 ext4_discard_preallocations(inode);
166
167 err = ext4_mark_inode_dirty(handle, inode);
168 if (err < 0) {
169 ext4_warning(inode->i_sb,
170 "couldn't mark inode #%lu dirty (err %d)",
171 inode->i_ino, err);
172 /* Revert all changes: */
173 swap_inode_data(inode, inode_bl);
174 } else {
175 err = ext4_mark_inode_dirty(handle, inode_bl);
176 if (err < 0) {
177 ext4_warning(inode_bl->i_sb,
178 "couldn't mark inode #%lu dirty (err %d)",
179 inode_bl->i_ino, err);
180 /* Revert all changes: */
181 swap_inode_data(inode, inode_bl);
182 ext4_mark_inode_dirty(handle, inode);
183 }
184 }
185 ext4_journal_stop(handle);
186 ext4_double_up_write_data_sem(inode, inode_bl);
187
188journal_err_out:
189 ext4_inode_resume_unlocked_dio(inode);
190 ext4_inode_resume_unlocked_dio(inode_bl);
191 unlock_two_nondirectories(inode, inode_bl);
192 iput(inode_bl);
193 return err;
194}
195
196static int uuid_is_zero(__u8 u[16])
197{
198 int i;
199
200 for (i = 0; i < 16; i++)
201 if (u[i])
202 return 0;
203 return 1;
204}
205
206static int ext4_ioctl_setflags(struct inode *inode,
207 unsigned int flags)
208{
209 struct ext4_inode_info *ei = EXT4_I(inode);
210 handle_t *handle = NULL;
211 int err = -EPERM, migrate = 0;
212 struct ext4_iloc iloc;
213 unsigned int oldflags, mask, i;
214 unsigned int jflag;
215
216 /* Is it quota file? Do not allow user to mess with it */
217 if (IS_NOQUOTA(inode))
218 goto flags_out;
219
220 oldflags = ei->i_flags;
221
222 /* The JOURNAL_DATA flag is modifiable only by root */
223 jflag = flags & EXT4_JOURNAL_DATA_FL;
224
225 /*
226 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
227 * the relevant capability.
228 *
229 * This test looks nicer. Thanks to Pauline Middelink
230 */
231 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
232 if (!capable(CAP_LINUX_IMMUTABLE))
233 goto flags_out;
234 }
235
236 /*
237 * The JOURNAL_DATA flag can only be changed by
238 * the relevant capability.
239 */
240 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
241 if (!capable(CAP_SYS_RESOURCE))
242 goto flags_out;
243 }
244 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
245 migrate = 1;
246
247 if (flags & EXT4_EOFBLOCKS_FL) {
248 /* we don't support adding EOFBLOCKS flag */
249 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
250 err = -EOPNOTSUPP;
251 goto flags_out;
252 }
253 } else if (oldflags & EXT4_EOFBLOCKS_FL)
254 ext4_truncate(inode);
255
256 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
257 if (IS_ERR(handle)) {
258 err = PTR_ERR(handle);
259 goto flags_out;
260 }
261 if (IS_SYNC(inode))
262 ext4_handle_sync(handle);
263 err = ext4_reserve_inode_write(handle, inode, &iloc);
264 if (err)
265 goto flags_err;
266
267 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
268 if (!(mask & EXT4_FL_USER_MODIFIABLE))
269 continue;
270 if (mask & flags)
271 ext4_set_inode_flag(inode, i);
272 else
273 ext4_clear_inode_flag(inode, i);
274 }
275
276 ext4_set_inode_flags(inode);
277 inode->i_ctime = ext4_current_time(inode);
278
279 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
280flags_err:
281 ext4_journal_stop(handle);
282 if (err)
283 goto flags_out;
284
285 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
286 err = ext4_change_inode_journal_flag(inode, jflag);
287 if (err)
288 goto flags_out;
289 if (migrate) {
290 if (flags & EXT4_EXTENTS_FL)
291 err = ext4_ext_migrate(inode);
292 else
293 err = ext4_ind_migrate(inode);
294 }
295
296flags_out:
297 return err;
298}
299
300#ifdef CONFIG_QUOTA
301static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
302{
303 struct inode *inode = file_inode(filp);
304 struct super_block *sb = inode->i_sb;
305 struct ext4_inode_info *ei = EXT4_I(inode);
306 int err, rc;
307 handle_t *handle;
308 kprojid_t kprojid;
309 struct ext4_iloc iloc;
310 struct ext4_inode *raw_inode;
311
312 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
313 EXT4_FEATURE_RO_COMPAT_PROJECT)) {
314 if (projid != EXT4_DEF_PROJID)
315 return -EOPNOTSUPP;
316 else
317 return 0;
318 }
319
320 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
321 return -EOPNOTSUPP;
322
323 kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
324
325 if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
326 return 0;
327
328 err = mnt_want_write_file(filp);
329 if (err)
330 return err;
331
332 err = -EPERM;
333 inode_lock(inode);
334 /* Is it quota file? Do not allow user to mess with it */
335 if (IS_NOQUOTA(inode))
336 goto out_unlock;
337
338 err = ext4_get_inode_loc(inode, &iloc);
339 if (err)
340 goto out_unlock;
341
342 raw_inode = ext4_raw_inode(&iloc);
343 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
344 err = -EOVERFLOW;
345 brelse(iloc.bh);
346 goto out_unlock;
347 }
348 brelse(iloc.bh);
349
350 dquot_initialize(inode);
351
352 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
353 EXT4_QUOTA_INIT_BLOCKS(sb) +
354 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
355 if (IS_ERR(handle)) {
356 err = PTR_ERR(handle);
357 goto out_unlock;
358 }
359
360 err = ext4_reserve_inode_write(handle, inode, &iloc);
361 if (err)
362 goto out_stop;
363
364 if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
365 struct dquot *transfer_to[MAXQUOTAS] = { };
366
367 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
368 if (transfer_to[PRJQUOTA]) {
369 err = __dquot_transfer(inode, transfer_to);
370 dqput(transfer_to[PRJQUOTA]);
371 if (err)
372 goto out_dirty;
373 }
374 }
375 EXT4_I(inode)->i_projid = kprojid;
376 inode->i_ctime = ext4_current_time(inode);
377out_dirty:
378 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
379 if (!err)
380 err = rc;
381out_stop:
382 ext4_journal_stop(handle);
383out_unlock:
384 inode_unlock(inode);
385 mnt_drop_write_file(filp);
386 return err;
387}
388#else
389static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
390{
391 if (projid != EXT4_DEF_PROJID)
392 return -EOPNOTSUPP;
393 return 0;
394}
395#endif
396
397/* Transfer internal flags to xflags */
398static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
399{
400 __u32 xflags = 0;
401
402 if (iflags & EXT4_SYNC_FL)
403 xflags |= FS_XFLAG_SYNC;
404 if (iflags & EXT4_IMMUTABLE_FL)
405 xflags |= FS_XFLAG_IMMUTABLE;
406 if (iflags & EXT4_APPEND_FL)
407 xflags |= FS_XFLAG_APPEND;
408 if (iflags & EXT4_NODUMP_FL)
409 xflags |= FS_XFLAG_NODUMP;
410 if (iflags & EXT4_NOATIME_FL)
411 xflags |= FS_XFLAG_NOATIME;
412 if (iflags & EXT4_PROJINHERIT_FL)
413 xflags |= FS_XFLAG_PROJINHERIT;
414 return xflags;
415}
416
417/* Transfer xflags flags to internal */
418static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
419{
420 unsigned long iflags = 0;
421
422 if (xflags & FS_XFLAG_SYNC)
423 iflags |= EXT4_SYNC_FL;
424 if (xflags & FS_XFLAG_IMMUTABLE)
425 iflags |= EXT4_IMMUTABLE_FL;
426 if (xflags & FS_XFLAG_APPEND)
427 iflags |= EXT4_APPEND_FL;
428 if (xflags & FS_XFLAG_NODUMP)
429 iflags |= EXT4_NODUMP_FL;
430 if (xflags & FS_XFLAG_NOATIME)
431 iflags |= EXT4_NOATIME_FL;
432 if (xflags & FS_XFLAG_PROJINHERIT)
433 iflags |= EXT4_PROJINHERIT_FL;
434
435 return iflags;
436}
437
438long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
439{
440 struct inode *inode = file_inode(filp);
441 struct super_block *sb = inode->i_sb;
442 struct ext4_inode_info *ei = EXT4_I(inode);
443 unsigned int flags;
444
445 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
446
447 switch (cmd) {
448 case EXT4_IOC_GETFLAGS:
449 ext4_get_inode_flags(ei);
450 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
451 return put_user(flags, (int __user *) arg);
452 case EXT4_IOC_SETFLAGS: {
453 int err;
454
455 if (!inode_owner_or_capable(inode))
456 return -EACCES;
457
458 if (get_user(flags, (int __user *) arg))
459 return -EFAULT;
460
461 err = mnt_want_write_file(filp);
462 if (err)
463 return err;
464
465 flags = ext4_mask_flags(inode->i_mode, flags);
466
467 inode_lock(inode);
468 err = ext4_ioctl_setflags(inode, flags);
469 inode_unlock(inode);
470 mnt_drop_write_file(filp);
471 return err;
472 }
473 case EXT4_IOC_GETVERSION:
474 case EXT4_IOC_GETVERSION_OLD:
475 return put_user(inode->i_generation, (int __user *) arg);
476 case EXT4_IOC_SETVERSION:
477 case EXT4_IOC_SETVERSION_OLD: {
478 handle_t *handle;
479 struct ext4_iloc iloc;
480 __u32 generation;
481 int err;
482
483 if (!inode_owner_or_capable(inode))
484 return -EPERM;
485
486 if (ext4_has_metadata_csum(inode->i_sb)) {
487 ext4_warning(sb, "Setting inode version is not "
488 "supported with metadata_csum enabled.");
489 return -ENOTTY;
490 }
491
492 err = mnt_want_write_file(filp);
493 if (err)
494 return err;
495 if (get_user(generation, (int __user *) arg)) {
496 err = -EFAULT;
497 goto setversion_out;
498 }
499
500 inode_lock(inode);
501 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
502 if (IS_ERR(handle)) {
503 err = PTR_ERR(handle);
504 goto unlock_out;
505 }
506 err = ext4_reserve_inode_write(handle, inode, &iloc);
507 if (err == 0) {
508 inode->i_ctime = ext4_current_time(inode);
509 inode->i_generation = generation;
510 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
511 }
512 ext4_journal_stop(handle);
513
514unlock_out:
515 inode_unlock(inode);
516setversion_out:
517 mnt_drop_write_file(filp);
518 return err;
519 }
520 case EXT4_IOC_GROUP_EXTEND: {
521 ext4_fsblk_t n_blocks_count;
522 int err, err2=0;
523
524 err = ext4_resize_begin(sb);
525 if (err)
526 return err;
527
528 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
529 err = -EFAULT;
530 goto group_extend_out;
531 }
532
533 if (ext4_has_feature_bigalloc(sb)) {
534 ext4_msg(sb, KERN_ERR,
535 "Online resizing not supported with bigalloc");
536 err = -EOPNOTSUPP;
537 goto group_extend_out;
538 }
539
540 err = mnt_want_write_file(filp);
541 if (err)
542 goto group_extend_out;
543
544 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
545 if (EXT4_SB(sb)->s_journal) {
546 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
547 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
548 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
549 }
550 if (err == 0)
551 err = err2;
552 mnt_drop_write_file(filp);
553group_extend_out:
554 ext4_resize_end(sb);
555 return err;
556 }
557
558 case EXT4_IOC_MOVE_EXT: {
559 struct move_extent me;
560 struct fd donor;
561 int err;
562
563 if (!(filp->f_mode & FMODE_READ) ||
564 !(filp->f_mode & FMODE_WRITE))
565 return -EBADF;
566
567 if (copy_from_user(&me,
568 (struct move_extent __user *)arg, sizeof(me)))
569 return -EFAULT;
570 me.moved_len = 0;
571
572 donor = fdget(me.donor_fd);
573 if (!donor.file)
574 return -EBADF;
575
576 if (!(donor.file->f_mode & FMODE_WRITE)) {
577 err = -EBADF;
578 goto mext_out;
579 }
580
581 if (ext4_has_feature_bigalloc(sb)) {
582 ext4_msg(sb, KERN_ERR,
583 "Online defrag not supported with bigalloc");
584 err = -EOPNOTSUPP;
585 goto mext_out;
586 } else if (IS_DAX(inode)) {
587 ext4_msg(sb, KERN_ERR,
588 "Online defrag not supported with DAX");
589 err = -EOPNOTSUPP;
590 goto mext_out;
591 }
592
593 err = mnt_want_write_file(filp);
594 if (err)
595 goto mext_out;
596
597 err = ext4_move_extents(filp, donor.file, me.orig_start,
598 me.donor_start, me.len, &me.moved_len);
599 mnt_drop_write_file(filp);
600
601 if (copy_to_user((struct move_extent __user *)arg,
602 &me, sizeof(me)))
603 err = -EFAULT;
604mext_out:
605 fdput(donor);
606 return err;
607 }
608
609 case EXT4_IOC_GROUP_ADD: {
610 struct ext4_new_group_data input;
611 int err, err2=0;
612
613 err = ext4_resize_begin(sb);
614 if (err)
615 return err;
616
617 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
618 sizeof(input))) {
619 err = -EFAULT;
620 goto group_add_out;
621 }
622
623 if (ext4_has_feature_bigalloc(sb)) {
624 ext4_msg(sb, KERN_ERR,
625 "Online resizing not supported with bigalloc");
626 err = -EOPNOTSUPP;
627 goto group_add_out;
628 }
629
630 err = mnt_want_write_file(filp);
631 if (err)
632 goto group_add_out;
633
634 err = ext4_group_add(sb, &input);
635 if (EXT4_SB(sb)->s_journal) {
636 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
637 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
638 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
639 }
640 if (err == 0)
641 err = err2;
642 mnt_drop_write_file(filp);
643 if (!err && ext4_has_group_desc_csum(sb) &&
644 test_opt(sb, INIT_INODE_TABLE))
645 err = ext4_register_li_request(sb, input.group);
646group_add_out:
647 ext4_resize_end(sb);
648 return err;
649 }
650
651 case EXT4_IOC_MIGRATE:
652 {
653 int err;
654 if (!inode_owner_or_capable(inode))
655 return -EACCES;
656
657 err = mnt_want_write_file(filp);
658 if (err)
659 return err;
660 /*
661 * inode_mutex prevent write and truncate on the file.
662 * Read still goes through. We take i_data_sem in
663 * ext4_ext_swap_inode_data before we switch the
664 * inode format to prevent read.
665 */
666 inode_lock((inode));
667 err = ext4_ext_migrate(inode);
668 inode_unlock((inode));
669 mnt_drop_write_file(filp);
670 return err;
671 }
672
673 case EXT4_IOC_ALLOC_DA_BLKS:
674 {
675 int err;
676 if (!inode_owner_or_capable(inode))
677 return -EACCES;
678
679 err = mnt_want_write_file(filp);
680 if (err)
681 return err;
682 err = ext4_alloc_da_blocks(inode);
683 mnt_drop_write_file(filp);
684 return err;
685 }
686
687 case EXT4_IOC_SWAP_BOOT:
688 {
689 int err;
690 if (!(filp->f_mode & FMODE_WRITE))
691 return -EBADF;
692 err = mnt_want_write_file(filp);
693 if (err)
694 return err;
695 err = swap_inode_boot_loader(sb, inode);
696 mnt_drop_write_file(filp);
697 return err;
698 }
699
700 case EXT4_IOC_RESIZE_FS: {
701 ext4_fsblk_t n_blocks_count;
702 int err = 0, err2 = 0;
703 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
704
705 if (ext4_has_feature_bigalloc(sb)) {
706 ext4_msg(sb, KERN_ERR,
707 "Online resizing not (yet) supported with bigalloc");
708 return -EOPNOTSUPP;
709 }
710
711 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
712 sizeof(__u64))) {
713 return -EFAULT;
714 }
715
716 err = ext4_resize_begin(sb);
717 if (err)
718 return err;
719
720 err = mnt_want_write_file(filp);
721 if (err)
722 goto resizefs_out;
723
724 err = ext4_resize_fs(sb, n_blocks_count);
725 if (EXT4_SB(sb)->s_journal) {
726 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
727 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
728 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
729 }
730 if (err == 0)
731 err = err2;
732 mnt_drop_write_file(filp);
733 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
734 ext4_has_group_desc_csum(sb) &&
735 test_opt(sb, INIT_INODE_TABLE))
736 err = ext4_register_li_request(sb, o_group);
737
738resizefs_out:
739 ext4_resize_end(sb);
740 return err;
741 }
742
743 case FITRIM:
744 {
745 struct request_queue *q = bdev_get_queue(sb->s_bdev);
746 struct fstrim_range range;
747 int ret = 0;
748
749 if (!capable(CAP_SYS_ADMIN))
750 return -EPERM;
751
752 if (!blk_queue_discard(q))
753 return -EOPNOTSUPP;
754
755 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
756 sizeof(range)))
757 return -EFAULT;
758
759 range.minlen = max((unsigned int)range.minlen,
760 q->limits.discard_granularity);
761 ret = ext4_trim_fs(sb, &range);
762 if (ret < 0)
763 return ret;
764
765 if (copy_to_user((struct fstrim_range __user *)arg, &range,
766 sizeof(range)))
767 return -EFAULT;
768
769 return 0;
770 }
771 case EXT4_IOC_PRECACHE_EXTENTS:
772 return ext4_ext_precache(inode);
773 case EXT4_IOC_SET_ENCRYPTION_POLICY: {
774#ifdef CONFIG_EXT4_FS_ENCRYPTION
775 struct ext4_encryption_policy policy;
776 int err = 0;
777
778 if (copy_from_user(&policy,
779 (struct ext4_encryption_policy __user *)arg,
780 sizeof(policy))) {
781 err = -EFAULT;
782 goto encryption_policy_out;
783 }
784
785 err = ext4_process_policy(&policy, inode);
786encryption_policy_out:
787 return err;
788#else
789 return -EOPNOTSUPP;
790#endif
791 }
792 case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
793 int err, err2;
794 struct ext4_sb_info *sbi = EXT4_SB(sb);
795 handle_t *handle;
796
797 if (!ext4_sb_has_crypto(sb))
798 return -EOPNOTSUPP;
799 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
800 err = mnt_want_write_file(filp);
801 if (err)
802 return err;
803 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
804 if (IS_ERR(handle)) {
805 err = PTR_ERR(handle);
806 goto pwsalt_err_exit;
807 }
808 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
809 if (err)
810 goto pwsalt_err_journal;
811 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
812 err = ext4_handle_dirty_metadata(handle, NULL,
813 sbi->s_sbh);
814 pwsalt_err_journal:
815 err2 = ext4_journal_stop(handle);
816 if (err2 && !err)
817 err = err2;
818 pwsalt_err_exit:
819 mnt_drop_write_file(filp);
820 if (err)
821 return err;
822 }
823 if (copy_to_user((void __user *) arg,
824 sbi->s_es->s_encrypt_pw_salt, 16))
825 return -EFAULT;
826 return 0;
827 }
828 case EXT4_IOC_GET_ENCRYPTION_POLICY: {
829#ifdef CONFIG_EXT4_FS_ENCRYPTION
830 struct ext4_encryption_policy policy;
831 int err = 0;
832
833 if (!ext4_encrypted_inode(inode))
834 return -ENOENT;
835 err = ext4_get_policy(inode, &policy);
836 if (err)
837 return err;
838 if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))
839 return -EFAULT;
840 return 0;
841#else
842 return -EOPNOTSUPP;
843#endif
844 }
845 case EXT4_IOC_FSGETXATTR:
846 {
847 struct fsxattr fa;
848
849 memset(&fa, 0, sizeof(struct fsxattr));
850 ext4_get_inode_flags(ei);
851 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
852
853 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
854 EXT4_FEATURE_RO_COMPAT_PROJECT)) {
855 fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
856 EXT4_I(inode)->i_projid);
857 }
858
859 if (copy_to_user((struct fsxattr __user *)arg,
860 &fa, sizeof(fa)))
861 return -EFAULT;
862 return 0;
863 }
864 case EXT4_IOC_FSSETXATTR:
865 {
866 struct fsxattr fa;
867 int err;
868
869 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
870 sizeof(fa)))
871 return -EFAULT;
872
873 /* Make sure caller has proper permission */
874 if (!inode_owner_or_capable(inode))
875 return -EACCES;
876
877 err = mnt_want_write_file(filp);
878 if (err)
879 return err;
880
881 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
882 flags = ext4_mask_flags(inode->i_mode, flags);
883
884 inode_lock(inode);
885 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
886 (flags & EXT4_FL_XFLAG_VISIBLE);
887 err = ext4_ioctl_setflags(inode, flags);
888 inode_unlock(inode);
889 mnt_drop_write_file(filp);
890 if (err)
891 return err;
892
893 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
894 if (err)
895 return err;
896
897 return 0;
898 }
899 default:
900 return -ENOTTY;
901 }
902}
903
904#ifdef CONFIG_COMPAT
905long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
906{
907 /* These are just misnamed, they actually get/put from/to user an int */
908 switch (cmd) {
909 case EXT4_IOC32_GETFLAGS:
910 cmd = EXT4_IOC_GETFLAGS;
911 break;
912 case EXT4_IOC32_SETFLAGS:
913 cmd = EXT4_IOC_SETFLAGS;
914 break;
915 case EXT4_IOC32_GETVERSION:
916 cmd = EXT4_IOC_GETVERSION;
917 break;
918 case EXT4_IOC32_SETVERSION:
919 cmd = EXT4_IOC_SETVERSION;
920 break;
921 case EXT4_IOC32_GROUP_EXTEND:
922 cmd = EXT4_IOC_GROUP_EXTEND;
923 break;
924 case EXT4_IOC32_GETVERSION_OLD:
925 cmd = EXT4_IOC_GETVERSION_OLD;
926 break;
927 case EXT4_IOC32_SETVERSION_OLD:
928 cmd = EXT4_IOC_SETVERSION_OLD;
929 break;
930 case EXT4_IOC32_GETRSVSZ:
931 cmd = EXT4_IOC_GETRSVSZ;
932 break;
933 case EXT4_IOC32_SETRSVSZ:
934 cmd = EXT4_IOC_SETRSVSZ;
935 break;
936 case EXT4_IOC32_GROUP_ADD: {
937 struct compat_ext4_new_group_input __user *uinput;
938 struct ext4_new_group_input input;
939 mm_segment_t old_fs;
940 int err;
941
942 uinput = compat_ptr(arg);
943 err = get_user(input.group, &uinput->group);
944 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
945 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
946 err |= get_user(input.inode_table, &uinput->inode_table);
947 err |= get_user(input.blocks_count, &uinput->blocks_count);
948 err |= get_user(input.reserved_blocks,
949 &uinput->reserved_blocks);
950 if (err)
951 return -EFAULT;
952 old_fs = get_fs();
953 set_fs(KERNEL_DS);
954 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
955 (unsigned long) &input);
956 set_fs(old_fs);
957 return err;
958 }
959 case EXT4_IOC_MOVE_EXT:
960 case EXT4_IOC_RESIZE_FS:
961 case EXT4_IOC_PRECACHE_EXTENTS:
962 case EXT4_IOC_SET_ENCRYPTION_POLICY:
963 case EXT4_IOC_GET_ENCRYPTION_PWSALT:
964 case EXT4_IOC_GET_ENCRYPTION_POLICY:
965 break;
966 default:
967 return -ENOIOCTLCMD;
968 }
969 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
970}
971#endif