summaryrefslogtreecommitdiffstats
path: root/fs/ocfs2/ioctl.c
blob: 50c9b30ee9f6f02466f1ec28c5cb3011e3a92287 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/ocfs2/ioctl.c
 *
 * Copyright (C) 2006 Herbert Poetzl
 * adapted from Remy Card's ext2/ioctl.c
 */

#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/blkdev.h>
#include <linux/compat.h>

#include <cluster/masklog.h>

#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
#include "journal.h"

#include "ocfs2_fs.h"
#include "ioctl.h"
#include "resize.h"
#include "refcounttree.h"
#include "sysfile.h"
#include "dir.h"
#include "buffer_head_io.h"
#include "suballoc.h"
#include "move_extents.h"

#define o2info_from_user(a, b)	\
		copy_from_user(&(a), (b), sizeof(a))
#define o2info_to_user(a, b)	\
		copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))

/*
 * This is just a best-effort to tell userspace that this request
 * caused the error.
 */
static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
					struct ocfs2_info_request __user *req)
{
	kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
	(void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
}

static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
{
	req->ir_flags |= OCFS2_INFO_FL_FILLED;
}

static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
{
	req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
}

static inline int o2info_coherent(struct ocfs2_info_request *req)
{
	return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
}

static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
{
	int status;

	status = ocfs2_inode_lock(inode, NULL, 0);
	if (status < 0) {
		mlog_errno(status);
		return status;
	}
	ocfs2_get_inode_flags(OCFS2_I(inode));
	*flags = OCFS2_I(inode)->ip_attr;
	ocfs2_inode_unlock(inode, 0);

	return status;
}

static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
				unsigned mask)
{
	struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	handle_t *handle = NULL;
	struct buffer_head *bh = NULL;
	unsigned oldflags;
	int status;

	inode_lock(inode);

	status = ocfs2_inode_lock(inode, &bh, 1);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	status = -EACCES;
	if (!inode_owner_or_capable(&init_user_ns, inode))
		goto bail_unlock;

	if (!S_ISDIR(inode->i_mode))
		flags &= ~OCFS2_DIRSYNC_FL;

	oldflags = ocfs2_inode->ip_attr;
	flags = flags & mask;
	flags |= oldflags & ~mask;

	status = vfs_ioc_setflags_prepare(inode, oldflags, flags);
	if (status)
		goto bail_unlock;

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		goto bail_unlock;
	}

	ocfs2_inode->ip_attr = flags;
	ocfs2_set_inode_flags(inode);

	status = ocfs2_mark_inode_dirty(handle, inode, bh);
	if (status < 0)
		mlog_errno(status);

	ocfs2_commit_trans(osb, handle);

bail_unlock:
	ocfs2_inode_unlock(inode, 1);
bail:
	inode_unlock(inode);

	brelse(bh);

	return status;
}

static int ocfs2_info_handle_blocksize(struct inode *inode,
				       struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_blocksize oib;

	if (o2info_from_user(oib, req))
		return -EFAULT;

	oib.ib_blocksize = inode->i_sb->s_blocksize;

	o2info_set_request_filled(&oib.ib_req);

	if (o2info_to_user(oib, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_clustersize(struct inode *inode,
					 struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_clustersize oic;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oic, req))
		return -EFAULT;

	oic.ic_clustersize = osb->s_clustersize;

	o2info_set_request_filled(&oic.ic_req);

	if (o2info_to_user(oic, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_maxslots(struct inode *inode,
				      struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_maxslots oim;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oim, req))
		return -EFAULT;

	oim.im_max_slots = osb->max_slots;

	o2info_set_request_filled(&oim.im_req);

	if (o2info_to_user(oim, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_label(struct inode *inode,
				   struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_label oil;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oil, req))
		return -EFAULT;

	memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);

	o2info_set_request_filled(&oil.il_req);

	if (o2info_to_user(oil, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_uuid(struct inode *inode,
				  struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_uuid oiu;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oiu, req))
		return -EFAULT;

	memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);

	o2info_set_request_filled(&oiu.iu_req);

	if (o2info_to_user(oiu, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_fs_features(struct inode *inode,
					 struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_fs_features oif;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oif, req))
		return -EFAULT;

	oif.if_compat_features = osb->s_feature_compat;
	oif.if_incompat_features = osb->s_feature_incompat;
	oif.if_ro_compat_features = osb->s_feature_ro_compat;

	o2info_set_request_filled(&oif.if_req);

	if (o2info_to_user(oif, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_journal_size(struct inode *inode,
					  struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_journal_size oij;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oij, req))
		return -EFAULT;

	oij.ij_journal_size = i_size_read(osb->journal->j_inode);

	o2info_set_request_filled(&oij.ij_req);

	if (o2info_to_user(oij, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
				       struct inode *inode_alloc, u64 blkno,
				       struct ocfs2_info_freeinode *fi,
				       u32 slot)
{
	int status = 0, unlock = 0;

	struct buffer_head *bh = NULL;
	struct ocfs2_dinode *dinode_alloc = NULL;

	if (inode_alloc)
		inode_lock(inode_alloc);

	if (inode_alloc && o2info_coherent(&fi->ifi_req)) {
		status = ocfs2_inode_lock(inode_alloc, &bh, 0);
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}
		unlock = 1;
	} else {
		status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}
	}

	dinode_alloc = (struct ocfs2_dinode *)bh->b_data;

	fi->ifi_stat[slot].lfi_total =
		le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
	fi->ifi_stat[slot].lfi_free =
		le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
		le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);

bail:
	if (unlock)
		ocfs2_inode_unlock(inode_alloc, 0);

	if (inode_alloc)
		inode_unlock(inode_alloc);

	brelse(bh);

	return status;
}

static int ocfs2_info_handle_freeinode(struct inode *inode,
				       struct ocfs2_info_request __user *req)
{
	u32 i;
	u64 blkno = -1;
	char namebuf[40];
	int status, type = INODE_ALLOC_SYSTEM_INODE;
	struct ocfs2_info_freeinode *oifi = NULL;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct inode *inode_alloc = NULL;

	oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
	if (!oifi) {
		status = -ENOMEM;
		mlog_errno(status);
		goto out_err;
	}

	if (o2info_from_user(*oifi, req)) {
		status = -EFAULT;
		goto out_free;
	}

	oifi->ifi_slotnum = osb->max_slots;

	for (i = 0; i < oifi->ifi_slotnum; i++) {
		if (o2info_coherent(&oifi->ifi_req)) {
			inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
			if (!inode_alloc) {
				mlog(ML_ERROR, "unable to get alloc inode in "
				    "slot %u\n", i);
				status = -EIO;
				goto bail;
			}
		} else {
			ocfs2_sprintf_system_inode_name(namebuf,
							sizeof(namebuf),
							type, i);
			status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
							    namebuf,
							    strlen(namebuf),
							    &blkno);
			if (status < 0) {
				status = -ENOENT;
				goto bail;
			}
		}

		status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);

		iput(inode_alloc);
		inode_alloc = NULL;

		if (status < 0)
			goto bail;
	}

	o2info_set_request_filled(&oifi->ifi_req);

	if (o2info_to_user(*oifi, req)) {
		status = -EFAULT;
		goto out_free;
	}

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oifi->ifi_req, req);
out_free:
	kfree(oifi);
out_err:
	return status;
}

static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
				   unsigned int chunksize)
{
	u32 index;

	index = __ilog2_u32(chunksize);
	if (index >= OCFS2_INFO_MAX_HIST)
		index = OCFS2_INFO_MAX_HIST - 1;

	hist->fc_chunks[index]++;
	hist->fc_clusters[index] += chunksize;
}

static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
			       unsigned int chunksize)
{
	if (chunksize > stats->ffs_max)
		stats->ffs_max = chunksize;

	if (chunksize < stats->ffs_min)
		stats->ffs_min = chunksize;

	stats->ffs_avg += chunksize;
	stats->ffs_free_chunks_real++;
}

static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
				  unsigned int chunksize)
{
	o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
	o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
}

static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
					  struct inode *gb_inode,
					  struct ocfs2_dinode *gb_dinode,
					  struct ocfs2_chain_rec *rec,
					  struct ocfs2_info_freefrag *ffg,
					  u32 chunks_in_group)
{
	int status = 0, used;
	u64 blkno;

	struct buffer_head *bh = NULL;
	struct ocfs2_group_desc *bg = NULL;

	unsigned int max_bits, num_clusters;
	unsigned int offset = 0, cluster, chunk;
	unsigned int chunk_free, last_chunksize = 0;

	if (!le32_to_cpu(rec->c_free))
		goto bail;

	do {
		if (!bg)
			blkno = le64_to_cpu(rec->c_blkno);
		else
			blkno = le64_to_cpu(bg->bg_next_group);

		if (bh) {
			brelse(bh);
			bh = NULL;
		}

		if (o2info_coherent(&ffg->iff_req))
			status = ocfs2_read_group_descriptor(gb_inode,
							     gb_dinode,
							     blkno, &bh);
		else
			status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);

		if (status < 0) {
			mlog(ML_ERROR, "Can't read the group descriptor # "
			     "%llu from device.", (unsigned long long)blkno);
			status = -EIO;
			goto bail;
		}

		bg = (struct ocfs2_group_desc *)bh->b_data;

		if (!le16_to_cpu(bg->bg_free_bits_count))
			continue;

		max_bits = le16_to_cpu(bg->bg_bits);
		offset = 0;

		for (chunk = 0; chunk < chunks_in_group; chunk++) {
			/*
			 * last chunk may be not an entire one.
			 */
			if ((offset + ffg->iff_chunksize) > max_bits)
				num_clusters = max_bits - offset;
			else
				num_clusters = ffg->iff_chunksize;

			chunk_free = 0;
			for (cluster = 0; cluster < num_clusters; cluster++) {
				used = ocfs2_test_bit(offset,
						(unsigned long *)bg->bg_bitmap);
				/*
				 * - chunk_free counts free clusters in #N chunk.
				 * - last_chunksize records the size(in) clusters
				 *   for the last real free chunk being counted.
				 */
				if (!used) {
					last_chunksize++;
					chunk_free++;
				}

				if (used && last_chunksize) {
					ocfs2_info_update_ffg(ffg,
							      last_chunksize);
					last_chunksize = 0;
				}

				offset++;
			}

			if (chunk_free == ffg->iff_chunksize)
				ffg->iff_ffs.ffs_free_chunks++;
		}

		/*
		 * need to update the info for last free chunk.
		 */
		if (last_chunksize)
			ocfs2_info_update_ffg(ffg, last_chunksize);

	} while (le64_to_cpu(bg->bg_next_group));

bail:
	brelse(bh);

	return status;
}

static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
					   struct inode *gb_inode, u64 blkno,
					   struct ocfs2_info_freefrag *ffg)
{
	u32 chunks_in_group;
	int status = 0, unlock = 0, i;

	struct buffer_head *bh = NULL;
	struct ocfs2_chain_list *cl = NULL;
	struct ocfs2_chain_rec *rec = NULL;
	struct ocfs2_dinode *gb_dinode = NULL;

	if (gb_inode)
		inode_lock(gb_inode);

	if (o2info_coherent(&ffg->iff_req)) {
		status = ocfs2_inode_lock(gb_inode, &bh, 0);
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}
		unlock = 1;
	} else {
		status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}
	}

	gb_dinode = (struct ocfs2_dinode *)bh->b_data;
	cl = &(gb_dinode->id2.i_chain);

	/*
	 * Chunksize(in) clusters from userspace should be
	 * less than clusters in a group.
	 */
	if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
		status = -EINVAL;
		goto bail;
	}

	memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));

	ffg->iff_ffs.ffs_min = ~0U;
	ffg->iff_ffs.ffs_clusters =
			le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
	ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
			le32_to_cpu(gb_dinode->id1.bitmap1.i_used);

	chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;

	for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
		rec = &(cl->cl_recs[i]);
		status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
							gb_dinode,
							rec, ffg,
							chunks_in_group);
		if (status)
			goto bail;
	}

	if (ffg->iff_ffs.ffs_free_chunks_real)
		ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
					ffg->iff_ffs.ffs_free_chunks_real);
bail:
	if (unlock)
		ocfs2_inode_unlock(gb_inode, 0);

	if (gb_inode)
		inode_unlock(gb_inode);

	iput(gb_inode);
	brelse(bh);

	return status;
}

static int ocfs2_info_handle_freefrag(struct inode *inode,
				      struct ocfs2_info_request __user *req)
{
	u64 blkno = -1;
	char namebuf[40];
	int status, type = GLOBAL_BITMAP_SYSTEM_INODE;

	struct ocfs2_info_freefrag *oiff;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct inode *gb_inode = NULL;

	oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
	if (!oiff) {
		status = -ENOMEM;
		mlog_errno(status);
		goto out_err;
	}

	if (o2info_from_user(*oiff, req)) {
		status = -EFAULT;
		goto out_free;
	}
	/*
	 * chunksize from userspace should be power of 2.
	 */
	if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
	    (!oiff->iff_chunksize)) {
		status = -EINVAL;
		goto bail;
	}

	if (o2info_coherent(&oiff->iff_req)) {
		gb_inode = ocfs2_get_system_file_inode(osb, type,
						       OCFS2_INVALID_SLOT);
		if (!gb_inode) {
			mlog(ML_ERROR, "unable to get global_bitmap inode\n");
			status = -EIO;
			goto bail;
		}
	} else {
		ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
						OCFS2_INVALID_SLOT);
		status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
						    namebuf,
						    strlen(namebuf),
						    &blkno);
		if (status < 0) {
			status = -ENOENT;
			goto bail;
		}
	}

	status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
	if (status < 0)
		goto bail;

	o2info_set_request_filled(&oiff->iff_req);

	if (o2info_to_user(*oiff, req)) {
		status = -EFAULT;
		goto out_free;
	}

	status = 0;
bail:
	if (status)
		o2info_set_request_error(&oiff->iff_req, req);
out_free:
	kfree(oiff);
out_err:
	return status;
}

static int ocfs2_info_handle_unknown(struct inode *inode,
				     struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_request oir;

	if (o2info_from_user(oir, req))
		return -EFAULT;

	o2info_clear_request_filled(&oir);

	if (o2info_to_user(oir, req))
		return -EFAULT;

	return 0;
}

/*
 * Validate and distinguish OCFS2_IOC_INFO requests.
 *
 * - validate the magic number.
 * - distinguish different requests.
 * - validate size of different requests.
 */
static int ocfs2_info_handle_request(struct inode *inode,
				     struct ocfs2_info_request __user *req)
{
	int status = -EFAULT;
	struct ocfs2_info_request oir;

	if (o2info_from_user(oir, req))
		goto bail;

	status = -EINVAL;
	if (oir.ir_magic != OCFS2_INFO_MAGIC)
		goto bail;

	switch (oir.ir_code) {
	case OCFS2_INFO_BLOCKSIZE:
		if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
			status = ocfs2_info_handle_blocksize(inode, req);
		break;
	case OCFS2_INFO_CLUSTERSIZE:
		if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
			status = ocfs2_info_handle_clustersize(inode, req);
		break;
	case OCFS2_INFO_MAXSLOTS:
		if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
			status = ocfs2_info_handle_maxslots(inode, req);
		break;
	case OCFS2_INFO_LABEL:
		if (oir.ir_size == sizeof(struct ocfs2_info_label))
			status = ocfs2_info_handle_label(inode, req);
		break;
	case OCFS2_INFO_UUID:
		if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
			status = ocfs2_info_handle_uuid(inode, req);
		break;
	case OCFS2_INFO_FS_FEATURES:
		if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
			status = ocfs2_info_handle_fs_features(inode, req);
		break;
	case OCFS2_INFO_JOURNAL_SIZE:
		if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
			status = ocfs2_info_handle_journal_size(inode, req);
		break;
	case OCFS2_INFO_FREEINODE:
		if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
			status = ocfs2_info_handle_freeinode(inode, req);
		break;
	case OCFS2_INFO_FREEFRAG:
		if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
			status = ocfs2_info_handle_freefrag(inode, req);
		break;
	default:
		status = ocfs2_info_handle_unknown(inode, req);
		break;
	}

bail:
	return status;
}

static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
				 u64 *req_addr, int compat_flag)
{
	int status = -EFAULT;
	u64 __user *bp = NULL;

	if (compat_flag) {
#ifdef CONFIG_COMPAT
		/*
		 * pointer bp stores the base address of a pointers array,
		 * which collects all addresses of separate request.
		 */
		bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
#else
		BUG();
#endif
	} else
		bp = (u64 __user *)(unsigned long)(info->oi_requests);

	if (o2info_from_user(*req_addr, bp + idx))
		goto bail;

	status = 0;
bail:
	return status;
}

/*
 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
 *
 * ocfs2_info_handle() recevies a large info aggregation, grab and
 * validate the request count from header, then break it into small
 * pieces, later specific handlers can handle them one by one.
 *
 * Idea here is to make each separate request small enough to ensure
 * a better backward&forward compatibility, since a small piece of
 * request will be less likely to be broken if disk layout get changed.
 */
static int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
			     int compat_flag)
{
	int i, status = 0;
	u64 req_addr;
	struct ocfs2_info_request __user *reqp;

	if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
	    (!info->oi_requests)) {
		status = -EINVAL;
		goto bail;
	}

	for (i = 0; i < info->oi_count; i++) {

		status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
		if (status)
			break;

		reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
		if (!reqp) {
			status = -EINVAL;
			goto bail;
		}

		status = ocfs2_info_handle_request(inode, reqp);
		if (status)
			break;
	}

bail:
	return status;
}

long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	unsigned int flags;
	int new_clusters;
	int status;
	struct ocfs2_space_resv sr;
	struct ocfs2_new_group_input input;
	struct reflink_arguments args;
	const char __user *old_path;
	const char __user *new_path;
	bool preserve;
	struct ocfs2_info info;
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	case OCFS2_IOC_GETFLAGS:
		status = ocfs2_get_inode_attr(inode, &flags);
		if (status < 0)
			return status;

		flags &= OCFS2_FL_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case OCFS2_IOC_SETFLAGS:
		if (get_user(flags, (int __user *) arg))
			return -EFAULT;

		status = mnt_want_write_file(filp);
		if (status)
			return status;
		status = ocfs2_set_inode_attr(inode, flags,
			OCFS2_FL_MODIFIABLE);
		mnt_drop_write_file(filp);
		return status;
	case OCFS2_IOC_RESVSP:
	case OCFS2_IOC_RESVSP64:
	case OCFS2_IOC_UNRESVSP:
	case OCFS2_IOC_UNRESVSP64:
		if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
			return -EFAULT;

		return ocfs2_change_file_space(filp, cmd, &sr);
	case OCFS2_IOC_GROUP_EXTEND:
		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (get_user(new_clusters, (int __user *)arg))
			return -EFAULT;

		status = mnt_want_write_file(filp);
		if (status)
			return status;
		status = ocfs2_group_extend(inode, new_clusters);
		mnt_drop_write_file(filp);
		return status;
	case OCFS2_IOC_GROUP_ADD:
	case OCFS2_IOC_GROUP_ADD64:
		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
			return -EFAULT;

		status = mnt_want_write_file(filp);
		if (status)
			return status;
		status = ocfs2_group_add(inode, &input);
		mnt_drop_write_file(filp);
		return status;
	case OCFS2_IOC_REFLINK:
		if (copy_from_user(&args, argp, sizeof(args)))
			return -EFAULT;
		old_path = (const char __user *)(unsigned long)args.old_path;
		new_path = (const char __user *)(unsigned long)args.new_path;
		preserve = (args.preserve != 0);

		return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
	case OCFS2_IOC_INFO:
		if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
			return -EFAULT;

		return ocfs2_info_handle(inode, &info, 0);
	case FITRIM:
	{
		struct super_block *sb = inode->i_sb;
		struct request_queue *q = bdev_get_queue(sb->s_bdev);
		struct fstrim_range range;
		int ret = 0;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (!blk_queue_discard(q))
			return -EOPNOTSUPP;

		if (copy_from_user(&range, argp, sizeof(range)))
			return -EFAULT;

		range.minlen = max_t(u64, q->limits.discard_granularity,
				     range.minlen);
		ret = ocfs2_trim_fs(sb, &range);
		if (ret < 0)
			return ret;

		if (copy_to_user(argp, &range, sizeof(range)))
			return -EFAULT;

		return 0;
	}
	case OCFS2_IOC_MOVE_EXT:
		return ocfs2_ioctl_move_extents(filp, argp);
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
	bool preserve;
	struct reflink_arguments args;
	struct inode *inode = file_inode(file);
	struct ocfs2_info info;
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	case OCFS2_IOC32_GETFLAGS:
		cmd = OCFS2_IOC_GETFLAGS;
		break;
	case OCFS2_IOC32_SETFLAGS:
		cmd = OCFS2_IOC_SETFLAGS;
		break;
	case OCFS2_IOC_RESVSP:
	case OCFS2_IOC_RESVSP64:
	case OCFS2_IOC_UNRESVSP:
	case OCFS2_IOC_UNRESVSP64:
	case OCFS2_IOC_GROUP_EXTEND:
	case OCFS2_IOC_GROUP_ADD:
	case OCFS2_IOC_GROUP_ADD64:
		break;
	case OCFS2_IOC_REFLINK:
		if (copy_from_user(&args, argp, sizeof(args)))
			return -EFAULT;
		preserve = (args.preserve != 0);

		return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
					   compat_ptr(args.new_path), preserve);
	case OCFS2_IOC_INFO:
		if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
			return -EFAULT;

		return ocfs2_info_handle(inode, &info, 1);
	case FITRIM:
	case OCFS2_IOC_MOVE_EXT:
		break;
	default:
		return -ENOIOCTLCMD;
	}

	return ocfs2_ioctl(file, cmd, arg);
}
#endif