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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext4/ioctl.c
4 *
5 * Copyright (C) 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 */
10
11#include <linux/fs.h>
12#include <linux/capability.h>
13#include <linux/time.h>
14#include <linux/compat.h>
15#include <linux/mount.h>
16#include <linux/file.h>
17#include <linux/quotaops.h>
18#include <linux/random.h>
19#include <linux/uuid.h>
20#include <linux/uaccess.h>
21#include <linux/delay.h>
22#include <linux/iversion.h>
23#include "ext4_jbd2.h"
24#include "ext4.h"
25#include <linux/fsmap.h>
26#include "fsmap.h"
27#include <trace/events/ext4.h>
28
29/**
30 * Swap memory between @a and @b for @len bytes.
31 *
32 * @a: pointer to first memory area
33 * @b: pointer to second memory area
34 * @len: number of bytes to swap
35 *
36 */
37static void memswap(void *a, void *b, size_t len)
38{
39 unsigned char *ap, *bp;
40
41 ap = (unsigned char *)a;
42 bp = (unsigned char *)b;
43 while (len-- > 0) {
44 swap(*ap, *bp);
45 ap++;
46 bp++;
47 }
48}
49
50/**
51 * Swap i_data and associated attributes between @inode1 and @inode2.
52 * This function is used for the primary swap between inode1 and inode2
53 * and also to revert this primary swap in case of errors.
54 *
55 * Therefore you have to make sure, that calling this method twice
56 * will revert all changes.
57 *
58 * @inode1: pointer to first inode
59 * @inode2: pointer to second inode
60 */
61static void swap_inode_data(struct inode *inode1, struct inode *inode2)
62{
63 loff_t isize;
64 struct ext4_inode_info *ei1;
65 struct ext4_inode_info *ei2;
66
67 ei1 = EXT4_I(inode1);
68 ei2 = EXT4_I(inode2);
69
70 swap(inode1->i_flags, inode2->i_flags);
71 swap(inode1->i_version, inode2->i_version);
72 swap(inode1->i_blocks, inode2->i_blocks);
73 swap(inode1->i_bytes, inode2->i_bytes);
74 swap(inode1->i_atime, inode2->i_atime);
75 swap(inode1->i_mtime, inode2->i_mtime);
76
77 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
78 swap(ei1->i_flags, ei2->i_flags);
79 swap(ei1->i_disksize, ei2->i_disksize);
80 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
81 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
82
83 isize = i_size_read(inode1);
84 i_size_write(inode1, i_size_read(inode2));
85 i_size_write(inode2, isize);
86}
87
88/**
89 * Swap the information from the given @inode and the inode
90 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
91 * important fields of the inodes.
92 *
93 * @sb: the super block of the filesystem
94 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
95 *
96 */
97static long swap_inode_boot_loader(struct super_block *sb,
98 struct inode *inode)
99{
100 handle_t *handle;
101 int err;
102 struct inode *inode_bl;
103 struct ext4_inode_info *ei_bl;
104
105 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
106 return -EINVAL;
107
108 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
109 return -EPERM;
110
111 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
112 if (IS_ERR(inode_bl))
113 return PTR_ERR(inode_bl);
114 ei_bl = EXT4_I(inode_bl);
115
116 filemap_flush(inode->i_mapping);
117 filemap_flush(inode_bl->i_mapping);
118
119 /* Protect orig inodes against a truncate and make sure,
120 * that only 1 swap_inode_boot_loader is running. */
121 lock_two_nondirectories(inode, inode_bl);
122
123 truncate_inode_pages(&inode->i_data, 0);
124 truncate_inode_pages(&inode_bl->i_data, 0);
125
126 /* Wait for all existing dio workers */
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_set_iversion(inode_bl, 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 = current_time(inode);
159
160 inode->i_generation = prandom_u32();
161 inode_bl->i_generation = prandom_u32();
162
163 ext4_discard_preallocations(inode);
164
165 err = ext4_mark_inode_dirty(handle, inode);
166 if (err < 0) {
167 ext4_warning(inode->i_sb,
168 "couldn't mark inode #%lu dirty (err %d)",
169 inode->i_ino, err);
170 /* Revert all changes: */
171 swap_inode_data(inode, inode_bl);
172 } else {
173 err = ext4_mark_inode_dirty(handle, inode_bl);
174 if (err < 0) {
175 ext4_warning(inode_bl->i_sb,
176 "couldn't mark inode #%lu dirty (err %d)",
177 inode_bl->i_ino, err);
178 /* Revert all changes: */
179 swap_inode_data(inode, inode_bl);
180 ext4_mark_inode_dirty(handle, inode);
181 }
182 }
183 ext4_journal_stop(handle);
184 ext4_double_up_write_data_sem(inode, inode_bl);
185
186journal_err_out:
187 unlock_two_nondirectories(inode, inode_bl);
188 iput(inode_bl);
189 return err;
190}
191
192#ifdef CONFIG_EXT4_FS_ENCRYPTION
193static int uuid_is_zero(__u8 u[16])
194{
195 int i;
196
197 for (i = 0; i < 16; i++)
198 if (u[i])
199 return 0;
200 return 1;
201}
202#endif
203
204static int ext4_ioctl_setflags(struct inode *inode,
205 unsigned int flags)
206{
207 struct ext4_inode_info *ei = EXT4_I(inode);
208 handle_t *handle = NULL;
209 int err = -EPERM, migrate = 0;
210 struct ext4_iloc iloc;
211 unsigned int oldflags, mask, i;
212 unsigned int jflag;
213
214 /* Is it quota file? Do not allow user to mess with it */
215 if (ext4_is_quota_file(inode))
216 goto flags_out;
217
218 oldflags = ei->i_flags;
219
220 /* The JOURNAL_DATA flag is modifiable only by root */
221 jflag = flags & EXT4_JOURNAL_DATA_FL;
222
223 /*
224 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
225 * the relevant capability.
226 *
227 * This test looks nicer. Thanks to Pauline Middelink
228 */
229 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
230 if (!capable(CAP_LINUX_IMMUTABLE))
231 goto flags_out;
232 }
233
234 /*
235 * The JOURNAL_DATA flag can only be changed by
236 * the relevant capability.
237 */
238 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
239 if (!capable(CAP_SYS_RESOURCE))
240 goto flags_out;
241 }
242 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
243 migrate = 1;
244
245 if (flags & EXT4_EOFBLOCKS_FL) {
246 /* we don't support adding EOFBLOCKS flag */
247 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
248 err = -EOPNOTSUPP;
249 goto flags_out;
250 }
251 } else if (oldflags & EXT4_EOFBLOCKS_FL) {
252 err = ext4_truncate(inode);
253 if (err)
254 goto flags_out;
255 }
256
257 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
258 if (IS_ERR(handle)) {
259 err = PTR_ERR(handle);
260 goto flags_out;
261 }
262 if (IS_SYNC(inode))
263 ext4_handle_sync(handle);
264 err = ext4_reserve_inode_write(handle, inode, &iloc);
265 if (err)
266 goto flags_err;
267
268 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
269 if (!(mask & EXT4_FL_USER_MODIFIABLE))
270 continue;
271 /* These flags get special treatment later */
272 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
273 continue;
274 if (mask & flags)
275 ext4_set_inode_flag(inode, i);
276 else
277 ext4_clear_inode_flag(inode, i);
278 }
279
280 ext4_set_inode_flags(inode);
281 inode->i_ctime = current_time(inode);
282
283 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
284flags_err:
285 ext4_journal_stop(handle);
286 if (err)
287 goto flags_out;
288
289 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
290 /*
291 * Changes to the journaling mode can cause unsafe changes to
292 * S_DAX if we are using the DAX mount option.
293 */
294 if (test_opt(inode->i_sb, DAX)) {
295 err = -EBUSY;
296 goto flags_out;
297 }
298
299 err = ext4_change_inode_journal_flag(inode, jflag);
300 if (err)
301 goto flags_out;
302 }
303 if (migrate) {
304 if (flags & EXT4_EXTENTS_FL)
305 err = ext4_ext_migrate(inode);
306 else
307 err = ext4_ind_migrate(inode);
308 }
309
310flags_out:
311 return err;
312}
313
314#ifdef CONFIG_QUOTA
315static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
316{
317 struct inode *inode = file_inode(filp);
318 struct super_block *sb = inode->i_sb;
319 struct ext4_inode_info *ei = EXT4_I(inode);
320 int err, rc;
321 handle_t *handle;
322 kprojid_t kprojid;
323 struct ext4_iloc iloc;
324 struct ext4_inode *raw_inode;
325 struct dquot *transfer_to[MAXQUOTAS] = { };
326
327 if (!ext4_has_feature_project(sb)) {
328 if (projid != EXT4_DEF_PROJID)
329 return -EOPNOTSUPP;
330 else
331 return 0;
332 }
333
334 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
335 return -EOPNOTSUPP;
336
337 kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
338
339 if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
340 return 0;
341
342 err = mnt_want_write_file(filp);
343 if (err)
344 return err;
345
346 err = -EPERM;
347 inode_lock(inode);
348 /* Is it quota file? Do not allow user to mess with it */
349 if (ext4_is_quota_file(inode))
350 goto out_unlock;
351
352 err = ext4_get_inode_loc(inode, &iloc);
353 if (err)
354 goto out_unlock;
355
356 raw_inode = ext4_raw_inode(&iloc);
357 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
358 err = ext4_expand_extra_isize(inode,
359 EXT4_SB(sb)->s_want_extra_isize,
360 &iloc);
361 if (err)
362 goto out_unlock;
363 } else {
364 brelse(iloc.bh);
365 }
366
367 dquot_initialize(inode);
368
369 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
370 EXT4_QUOTA_INIT_BLOCKS(sb) +
371 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
372 if (IS_ERR(handle)) {
373 err = PTR_ERR(handle);
374 goto out_unlock;
375 }
376
377 err = ext4_reserve_inode_write(handle, inode, &iloc);
378 if (err)
379 goto out_stop;
380
381 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
382 if (!IS_ERR(transfer_to[PRJQUOTA])) {
383
384 /* __dquot_transfer() calls back ext4_get_inode_usage() which
385 * counts xattr inode references.
386 */
387 down_read(&EXT4_I(inode)->xattr_sem);
388 err = __dquot_transfer(inode, transfer_to);
389 up_read(&EXT4_I(inode)->xattr_sem);
390 dqput(transfer_to[PRJQUOTA]);
391 if (err)
392 goto out_dirty;
393 }
394
395 EXT4_I(inode)->i_projid = kprojid;
396 inode->i_ctime = current_time(inode);
397out_dirty:
398 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
399 if (!err)
400 err = rc;
401out_stop:
402 ext4_journal_stop(handle);
403out_unlock:
404 inode_unlock(inode);
405 mnt_drop_write_file(filp);
406 return err;
407}
408#else
409static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
410{
411 if (projid != EXT4_DEF_PROJID)
412 return -EOPNOTSUPP;
413 return 0;
414}
415#endif
416
417/* Transfer internal flags to xflags */
418static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
419{
420 __u32 xflags = 0;
421
422 if (iflags & EXT4_SYNC_FL)
423 xflags |= FS_XFLAG_SYNC;
424 if (iflags & EXT4_IMMUTABLE_FL)
425 xflags |= FS_XFLAG_IMMUTABLE;
426 if (iflags & EXT4_APPEND_FL)
427 xflags |= FS_XFLAG_APPEND;
428 if (iflags & EXT4_NODUMP_FL)
429 xflags |= FS_XFLAG_NODUMP;
430 if (iflags & EXT4_NOATIME_FL)
431 xflags |= FS_XFLAG_NOATIME;
432 if (iflags & EXT4_PROJINHERIT_FL)
433 xflags |= FS_XFLAG_PROJINHERIT;
434 return xflags;
435}
436
437#define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
438 FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
439 FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
440
441/* Transfer xflags flags to internal */
442static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
443{
444 unsigned long iflags = 0;
445
446 if (xflags & FS_XFLAG_SYNC)
447 iflags |= EXT4_SYNC_FL;
448 if (xflags & FS_XFLAG_IMMUTABLE)
449 iflags |= EXT4_IMMUTABLE_FL;
450 if (xflags & FS_XFLAG_APPEND)
451 iflags |= EXT4_APPEND_FL;
452 if (xflags & FS_XFLAG_NODUMP)
453 iflags |= EXT4_NODUMP_FL;
454 if (xflags & FS_XFLAG_NOATIME)
455 iflags |= EXT4_NOATIME_FL;
456 if (xflags & FS_XFLAG_PROJINHERIT)
457 iflags |= EXT4_PROJINHERIT_FL;
458
459 return iflags;
460}
461
462static int ext4_shutdown(struct super_block *sb, unsigned long arg)
463{
464 struct ext4_sb_info *sbi = EXT4_SB(sb);
465 __u32 flags;
466
467 if (!capable(CAP_SYS_ADMIN))
468 return -EPERM;
469
470 if (get_user(flags, (__u32 __user *)arg))
471 return -EFAULT;
472
473 if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
474 return -EINVAL;
475
476 if (ext4_forced_shutdown(sbi))
477 return 0;
478
479 ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
480 trace_ext4_shutdown(sb, flags);
481
482 switch (flags) {
483 case EXT4_GOING_FLAGS_DEFAULT:
484 freeze_bdev(sb->s_bdev);
485 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
486 thaw_bdev(sb->s_bdev, sb);
487 break;
488 case EXT4_GOING_FLAGS_LOGFLUSH:
489 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
490 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
491 (void) ext4_force_commit(sb);
492 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
493 }
494 break;
495 case EXT4_GOING_FLAGS_NOLOGFLUSH:
496 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
497 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
498 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
499 break;
500 default:
501 return -EINVAL;
502 }
503 clear_opt(sb, DISCARD);
504 return 0;
505}
506
507struct getfsmap_info {
508 struct super_block *gi_sb;
509 struct fsmap_head __user *gi_data;
510 unsigned int gi_idx;
511 __u32 gi_last_flags;
512};
513
514static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
515{
516 struct getfsmap_info *info = priv;
517 struct fsmap fm;
518
519 trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
520
521 info->gi_last_flags = xfm->fmr_flags;
522 ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
523 if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
524 sizeof(struct fsmap)))
525 return -EFAULT;
526
527 return 0;
528}
529
530static int ext4_ioc_getfsmap(struct super_block *sb,
531 struct fsmap_head __user *arg)
532{
533 struct getfsmap_info info = {0};
534 struct ext4_fsmap_head xhead = {0};
535 struct fsmap_head head;
536 bool aborted = false;
537 int error;
538
539 if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
540 return -EFAULT;
541 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
542 memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
543 sizeof(head.fmh_keys[0].fmr_reserved)) ||
544 memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
545 sizeof(head.fmh_keys[1].fmr_reserved)))
546 return -EINVAL;
547 /*
548 * ext4 doesn't report file extents at all, so the only valid
549 * file offsets are the magic ones (all zeroes or all ones).
550 */
551 if (head.fmh_keys[0].fmr_offset ||
552 (head.fmh_keys[1].fmr_offset != 0 &&
553 head.fmh_keys[1].fmr_offset != -1ULL))
554 return -EINVAL;
555
556 xhead.fmh_iflags = head.fmh_iflags;
557 xhead.fmh_count = head.fmh_count;
558 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
559 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
560
561 trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
562 trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
563
564 info.gi_sb = sb;
565 info.gi_data = arg;
566 error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
567 if (error == EXT4_QUERY_RANGE_ABORT) {
568 error = 0;
569 aborted = true;
570 } else if (error)
571 return error;
572
573 /* If we didn't abort, set the "last" flag in the last fmx */
574 if (!aborted && info.gi_idx) {
575 info.gi_last_flags |= FMR_OF_LAST;
576 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
577 &info.gi_last_flags,
578 sizeof(info.gi_last_flags)))
579 return -EFAULT;
580 }
581
582 /* copy back header */
583 head.fmh_entries = xhead.fmh_entries;
584 head.fmh_oflags = xhead.fmh_oflags;
585 if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
586 return -EFAULT;
587
588 return 0;
589}
590
591static long ext4_ioctl_group_add(struct file *file,
592 struct ext4_new_group_data *input)
593{
594 struct super_block *sb = file_inode(file)->i_sb;
595 int err, err2=0;
596
597 err = ext4_resize_begin(sb);
598 if (err)
599 return err;
600
601 if (ext4_has_feature_bigalloc(sb)) {
602 ext4_msg(sb, KERN_ERR,
603 "Online resizing not supported with bigalloc");
604 err = -EOPNOTSUPP;
605 goto group_add_out;
606 }
607
608 err = mnt_want_write_file(file);
609 if (err)
610 goto group_add_out;
611
612 err = ext4_group_add(sb, input);
613 if (EXT4_SB(sb)->s_journal) {
614 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
615 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
616 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
617 }
618 if (err == 0)
619 err = err2;
620 mnt_drop_write_file(file);
621 if (!err && ext4_has_group_desc_csum(sb) &&
622 test_opt(sb, INIT_INODE_TABLE))
623 err = ext4_register_li_request(sb, input->group);
624group_add_out:
625 ext4_resize_end(sb);
626 return err;
627}
628
629long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
630{
631 struct inode *inode = file_inode(filp);
632 struct super_block *sb = inode->i_sb;
633 struct ext4_inode_info *ei = EXT4_I(inode);
634 unsigned int flags;
635
636 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
637
638 switch (cmd) {
639 case FS_IOC_GETFSMAP:
640 return ext4_ioc_getfsmap(sb, (void __user *)arg);
641 case EXT4_IOC_GETFLAGS:
642 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
643 return put_user(flags, (int __user *) arg);
644 case EXT4_IOC_SETFLAGS: {
645 int err;
646
647 if (!inode_owner_or_capable(inode))
648 return -EACCES;
649
650 if (get_user(flags, (int __user *) arg))
651 return -EFAULT;
652
653 if (flags & ~EXT4_FL_USER_VISIBLE)
654 return -EOPNOTSUPP;
655 /*
656 * chattr(1) grabs flags via GETFLAGS, modifies the result and
657 * passes that to SETFLAGS. So we cannot easily make SETFLAGS
658 * more restrictive than just silently masking off visible but
659 * not settable flags as we always did.
660 */
661 flags &= EXT4_FL_USER_MODIFIABLE;
662 if (ext4_mask_flags(inode->i_mode, flags) != flags)
663 return -EOPNOTSUPP;
664
665 err = mnt_want_write_file(filp);
666 if (err)
667 return err;
668
669 inode_lock(inode);
670 err = ext4_ioctl_setflags(inode, flags);
671 inode_unlock(inode);
672 mnt_drop_write_file(filp);
673 return err;
674 }
675 case EXT4_IOC_GETVERSION:
676 case EXT4_IOC_GETVERSION_OLD:
677 return put_user(inode->i_generation, (int __user *) arg);
678 case EXT4_IOC_SETVERSION:
679 case EXT4_IOC_SETVERSION_OLD: {
680 handle_t *handle;
681 struct ext4_iloc iloc;
682 __u32 generation;
683 int err;
684
685 if (!inode_owner_or_capable(inode))
686 return -EPERM;
687
688 if (ext4_has_metadata_csum(inode->i_sb)) {
689 ext4_warning(sb, "Setting inode version is not "
690 "supported with metadata_csum enabled.");
691 return -ENOTTY;
692 }
693
694 err = mnt_want_write_file(filp);
695 if (err)
696 return err;
697 if (get_user(generation, (int __user *) arg)) {
698 err = -EFAULT;
699 goto setversion_out;
700 }
701
702 inode_lock(inode);
703 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
704 if (IS_ERR(handle)) {
705 err = PTR_ERR(handle);
706 goto unlock_out;
707 }
708 err = ext4_reserve_inode_write(handle, inode, &iloc);
709 if (err == 0) {
710 inode->i_ctime = current_time(inode);
711 inode->i_generation = generation;
712 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
713 }
714 ext4_journal_stop(handle);
715
716unlock_out:
717 inode_unlock(inode);
718setversion_out:
719 mnt_drop_write_file(filp);
720 return err;
721 }
722 case EXT4_IOC_GROUP_EXTEND: {
723 ext4_fsblk_t n_blocks_count;
724 int err, err2=0;
725
726 err = ext4_resize_begin(sb);
727 if (err)
728 return err;
729
730 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
731 err = -EFAULT;
732 goto group_extend_out;
733 }
734
735 if (ext4_has_feature_bigalloc(sb)) {
736 ext4_msg(sb, KERN_ERR,
737 "Online resizing not supported with bigalloc");
738 err = -EOPNOTSUPP;
739 goto group_extend_out;
740 }
741
742 err = mnt_want_write_file(filp);
743 if (err)
744 goto group_extend_out;
745
746 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
747 if (EXT4_SB(sb)->s_journal) {
748 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
749 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
750 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
751 }
752 if (err == 0)
753 err = err2;
754 mnt_drop_write_file(filp);
755group_extend_out:
756 ext4_resize_end(sb);
757 return err;
758 }
759
760 case EXT4_IOC_MOVE_EXT: {
761 struct move_extent me;
762 struct fd donor;
763 int err;
764
765 if (!(filp->f_mode & FMODE_READ) ||
766 !(filp->f_mode & FMODE_WRITE))
767 return -EBADF;
768
769 if (copy_from_user(&me,
770 (struct move_extent __user *)arg, sizeof(me)))
771 return -EFAULT;
772 me.moved_len = 0;
773
774 donor = fdget(me.donor_fd);
775 if (!donor.file)
776 return -EBADF;
777
778 if (!(donor.file->f_mode & FMODE_WRITE)) {
779 err = -EBADF;
780 goto mext_out;
781 }
782
783 if (ext4_has_feature_bigalloc(sb)) {
784 ext4_msg(sb, KERN_ERR,
785 "Online defrag not supported with bigalloc");
786 err = -EOPNOTSUPP;
787 goto mext_out;
788 } else if (IS_DAX(inode)) {
789 ext4_msg(sb, KERN_ERR,
790 "Online defrag not supported with DAX");
791 err = -EOPNOTSUPP;
792 goto mext_out;
793 }
794
795 err = mnt_want_write_file(filp);
796 if (err)
797 goto mext_out;
798
799 err = ext4_move_extents(filp, donor.file, me.orig_start,
800 me.donor_start, me.len, &me.moved_len);
801 mnt_drop_write_file(filp);
802
803 if (copy_to_user((struct move_extent __user *)arg,
804 &me, sizeof(me)))
805 err = -EFAULT;
806mext_out:
807 fdput(donor);
808 return err;
809 }
810
811 case EXT4_IOC_GROUP_ADD: {
812 struct ext4_new_group_data input;
813
814 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
815 sizeof(input)))
816 return -EFAULT;
817
818 return ext4_ioctl_group_add(filp, &input);
819 }
820
821 case EXT4_IOC_MIGRATE:
822 {
823 int err;
824 if (!inode_owner_or_capable(inode))
825 return -EACCES;
826
827 err = mnt_want_write_file(filp);
828 if (err)
829 return err;
830 /*
831 * inode_mutex prevent write and truncate on the file.
832 * Read still goes through. We take i_data_sem in
833 * ext4_ext_swap_inode_data before we switch the
834 * inode format to prevent read.
835 */
836 inode_lock((inode));
837 err = ext4_ext_migrate(inode);
838 inode_unlock((inode));
839 mnt_drop_write_file(filp);
840 return err;
841 }
842
843 case EXT4_IOC_ALLOC_DA_BLKS:
844 {
845 int err;
846 if (!inode_owner_or_capable(inode))
847 return -EACCES;
848
849 err = mnt_want_write_file(filp);
850 if (err)
851 return err;
852 err = ext4_alloc_da_blocks(inode);
853 mnt_drop_write_file(filp);
854 return err;
855 }
856
857 case EXT4_IOC_SWAP_BOOT:
858 {
859 int err;
860 if (!(filp->f_mode & FMODE_WRITE))
861 return -EBADF;
862 err = mnt_want_write_file(filp);
863 if (err)
864 return err;
865 err = swap_inode_boot_loader(sb, inode);
866 mnt_drop_write_file(filp);
867 return err;
868 }
869
870 case EXT4_IOC_RESIZE_FS: {
871 ext4_fsblk_t n_blocks_count;
872 int err = 0, err2 = 0;
873 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
874
875 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
876 sizeof(__u64))) {
877 return -EFAULT;
878 }
879
880 err = ext4_resize_begin(sb);
881 if (err)
882 return err;
883
884 err = mnt_want_write_file(filp);
885 if (err)
886 goto resizefs_out;
887
888 err = ext4_resize_fs(sb, n_blocks_count);
889 if (EXT4_SB(sb)->s_journal) {
890 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
891 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
892 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
893 }
894 if (err == 0)
895 err = err2;
896 mnt_drop_write_file(filp);
897 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
898 ext4_has_group_desc_csum(sb) &&
899 test_opt(sb, INIT_INODE_TABLE))
900 err = ext4_register_li_request(sb, o_group);
901
902resizefs_out:
903 ext4_resize_end(sb);
904 return err;
905 }
906
907 case FITRIM:
908 {
909 struct request_queue *q = bdev_get_queue(sb->s_bdev);
910 struct fstrim_range range;
911 int ret = 0;
912
913 if (!capable(CAP_SYS_ADMIN))
914 return -EPERM;
915
916 if (!blk_queue_discard(q))
917 return -EOPNOTSUPP;
918
919 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
920 sizeof(range)))
921 return -EFAULT;
922
923 range.minlen = max((unsigned int)range.minlen,
924 q->limits.discard_granularity);
925 ret = ext4_trim_fs(sb, &range);
926 if (ret < 0)
927 return ret;
928
929 if (copy_to_user((struct fstrim_range __user *)arg, &range,
930 sizeof(range)))
931 return -EFAULT;
932
933 return 0;
934 }
935 case EXT4_IOC_PRECACHE_EXTENTS:
936 return ext4_ext_precache(inode);
937
938 case EXT4_IOC_SET_ENCRYPTION_POLICY:
939 if (!ext4_has_feature_encrypt(sb))
940 return -EOPNOTSUPP;
941 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
942
943 case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
944#ifdef CONFIG_EXT4_FS_ENCRYPTION
945 int err, err2;
946 struct ext4_sb_info *sbi = EXT4_SB(sb);
947 handle_t *handle;
948
949 if (!ext4_has_feature_encrypt(sb))
950 return -EOPNOTSUPP;
951 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
952 err = mnt_want_write_file(filp);
953 if (err)
954 return err;
955 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
956 if (IS_ERR(handle)) {
957 err = PTR_ERR(handle);
958 goto pwsalt_err_exit;
959 }
960 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
961 if (err)
962 goto pwsalt_err_journal;
963 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
964 err = ext4_handle_dirty_metadata(handle, NULL,
965 sbi->s_sbh);
966 pwsalt_err_journal:
967 err2 = ext4_journal_stop(handle);
968 if (err2 && !err)
969 err = err2;
970 pwsalt_err_exit:
971 mnt_drop_write_file(filp);
972 if (err)
973 return err;
974 }
975 if (copy_to_user((void __user *) arg,
976 sbi->s_es->s_encrypt_pw_salt, 16))
977 return -EFAULT;
978 return 0;
979#else
980 return -EOPNOTSUPP;
981#endif
982 }
983 case EXT4_IOC_GET_ENCRYPTION_POLICY:
984 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
985
986 case EXT4_IOC_FSGETXATTR:
987 {
988 struct fsxattr fa;
989
990 memset(&fa, 0, sizeof(struct fsxattr));
991 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
992
993 if (ext4_has_feature_project(inode->i_sb)) {
994 fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
995 EXT4_I(inode)->i_projid);
996 }
997
998 if (copy_to_user((struct fsxattr __user *)arg,
999 &fa, sizeof(fa)))
1000 return -EFAULT;
1001 return 0;
1002 }
1003 case EXT4_IOC_FSSETXATTR:
1004 {
1005 struct fsxattr fa;
1006 int err;
1007
1008 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1009 sizeof(fa)))
1010 return -EFAULT;
1011
1012 /* Make sure caller has proper permission */
1013 if (!inode_owner_or_capable(inode))
1014 return -EACCES;
1015
1016 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1017 return -EOPNOTSUPP;
1018
1019 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1020 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1021 return -EOPNOTSUPP;
1022
1023 err = mnt_want_write_file(filp);
1024 if (err)
1025 return err;
1026
1027 inode_lock(inode);
1028 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1029 (flags & EXT4_FL_XFLAG_VISIBLE);
1030 err = ext4_ioctl_setflags(inode, flags);
1031 inode_unlock(inode);
1032 mnt_drop_write_file(filp);
1033 if (err)
1034 return err;
1035
1036 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1037 if (err)
1038 return err;
1039
1040 return 0;
1041 }
1042 case EXT4_IOC_SHUTDOWN:
1043 return ext4_shutdown(sb, arg);
1044 default:
1045 return -ENOTTY;
1046 }
1047}
1048
1049#ifdef CONFIG_COMPAT
1050long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1051{
1052 /* These are just misnamed, they actually get/put from/to user an int */
1053 switch (cmd) {
1054 case EXT4_IOC32_GETFLAGS:
1055 cmd = EXT4_IOC_GETFLAGS;
1056 break;
1057 case EXT4_IOC32_SETFLAGS:
1058 cmd = EXT4_IOC_SETFLAGS;
1059 break;
1060 case EXT4_IOC32_GETVERSION:
1061 cmd = EXT4_IOC_GETVERSION;
1062 break;
1063 case EXT4_IOC32_SETVERSION:
1064 cmd = EXT4_IOC_SETVERSION;
1065 break;
1066 case EXT4_IOC32_GROUP_EXTEND:
1067 cmd = EXT4_IOC_GROUP_EXTEND;
1068 break;
1069 case EXT4_IOC32_GETVERSION_OLD:
1070 cmd = EXT4_IOC_GETVERSION_OLD;
1071 break;
1072 case EXT4_IOC32_SETVERSION_OLD:
1073 cmd = EXT4_IOC_SETVERSION_OLD;
1074 break;
1075 case EXT4_IOC32_GETRSVSZ:
1076 cmd = EXT4_IOC_GETRSVSZ;
1077 break;
1078 case EXT4_IOC32_SETRSVSZ:
1079 cmd = EXT4_IOC_SETRSVSZ;
1080 break;
1081 case EXT4_IOC32_GROUP_ADD: {
1082 struct compat_ext4_new_group_input __user *uinput;
1083 struct ext4_new_group_data input;
1084 int err;
1085
1086 uinput = compat_ptr(arg);
1087 err = get_user(input.group, &uinput->group);
1088 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1089 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1090 err |= get_user(input.inode_table, &uinput->inode_table);
1091 err |= get_user(input.blocks_count, &uinput->blocks_count);
1092 err |= get_user(input.reserved_blocks,
1093 &uinput->reserved_blocks);
1094 if (err)
1095 return -EFAULT;
1096 return ext4_ioctl_group_add(file, &input);
1097 }
1098 case EXT4_IOC_MOVE_EXT:
1099 case EXT4_IOC_RESIZE_FS:
1100 case EXT4_IOC_PRECACHE_EXTENTS:
1101 case EXT4_IOC_SET_ENCRYPTION_POLICY:
1102 case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1103 case EXT4_IOC_GET_ENCRYPTION_POLICY:
1104 case EXT4_IOC_SHUTDOWN:
1105 case FS_IOC_GETFSMAP:
1106 break;
1107 default:
1108 return -ENOIOCTLCMD;
1109 }
1110 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1111}
1112#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/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