summaryrefslogtreecommitdiffstats
path: root/fs/nilfs2/ioctl.c
blob: 7fbd9fe1d035e8545086f44c9c852658a27ad5fc (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
/*
 * ioctl.c - NILFS ioctl operations.
 *
 * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Written by Koji Sato <koji@osrg.net>.
 */

#include <linux/fs.h>
#include <linux/wait.h>
#include <linux/smp_lock.h>	/* lock_kernel(), unlock_kernel() */
#include <linux/capability.h>	/* capable() */
#include <linux/uaccess.h>	/* copy_from_user(), copy_to_user() */
#include <linux/nilfs2_fs.h>
#include "nilfs.h"
#include "segment.h"
#include "bmap.h"
#include "cpfile.h"
#include "sufile.h"
#include "dat.h"


static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
				 struct nilfs_argv *argv, int dir,
				 ssize_t (*dofunc)(struct the_nilfs *,
						   __u64 *, int,
						   void *, size_t, size_t))
{
	void *buf;
	void __user *base = (void __user *)(unsigned long)argv->v_base;
	size_t maxmembs, total, n;
	ssize_t nr;
	int ret, i;
	__u64 pos, ppos;

	if (argv->v_nmembs == 0)
		return 0;

	if (argv->v_size > PAGE_SIZE)
		return -EINVAL;

	buf = (void *)__get_free_pages(GFP_NOFS, 0);
	if (unlikely(!buf))
		return -ENOMEM;
	maxmembs = PAGE_SIZE / argv->v_size;

	ret = 0;
	total = 0;
	pos = argv->v_index;
	for (i = 0; i < argv->v_nmembs; i += n) {
		n = (argv->v_nmembs - i < maxmembs) ?
			argv->v_nmembs - i : maxmembs;
		if ((dir & _IOC_WRITE) &&
		    copy_from_user(buf, base + argv->v_size * i,
				   argv->v_size * n)) {
			ret = -EFAULT;
			break;
		}
		ppos = pos;
		nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
			       n);
		if (nr < 0) {
			ret = nr;
			break;
		}
		if ((dir & _IOC_READ) &&
		    copy_to_user(base + argv->v_size * i, buf,
				 argv->v_size * nr)) {
			ret = -EFAULT;
			break;
		}
		total += nr;
		if ((size_t)nr < n)
			break;
		if (pos == ppos)
			pos += n;
	}
	argv->v_nmembs = total;

	free_pages((unsigned long)buf, 0);
	return ret;
}

static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
				     unsigned int cmd, void __user *argp)
{
	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	struct nilfs_transaction_info ti;
	struct nilfs_cpmode cpmode;
	int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
		return -EFAULT;

	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	ret = nilfs_cpfile_change_cpmode(
		cpfile, cpmode.cm_cno, cpmode.cm_mode);
	if (unlikely(ret < 0)) {
		nilfs_transaction_abort(inode->i_sb);
		return ret;
	}
	nilfs_transaction_commit(inode->i_sb); /* never fails */
	return ret;
}

static int
nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
			      unsigned int cmd, void __user *argp)
{
	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	struct nilfs_transaction_info ti;
	__u64 cno;
	int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (copy_from_user(&cno, argp, sizeof(cno)))
		return -EFAULT;

	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
	if (unlikely(ret < 0)) {
		nilfs_transaction_abort(inode->i_sb);
		return ret;
	}
	nilfs_transaction_commit(inode->i_sb); /* never fails */
	return ret;
}

static ssize_t
nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
			  void *buf, size_t size, size_t nmembs)
{
	return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
				       nmembs);
}

static int nilfs_ioctl_get_cpinfo(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_argv argv;
	int ret;

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

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
				    nilfs_ioctl_do_get_cpinfo);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &argv, sizeof(argv)))
		ret = -EFAULT;
	return ret;
}

static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_cpstat cpstat;
	int ret;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
		ret = -EFAULT;
	return ret;
}

static ssize_t
nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
			  void *buf, size_t size, size_t nmembs)
{
	return nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
}

static int nilfs_ioctl_get_suinfo(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_argv argv;
	int ret;

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

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
				    nilfs_ioctl_do_get_suinfo);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &argv, sizeof(argv)))
		ret = -EFAULT;
	return ret;
}

static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_sustat sustat;
	int ret;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &sustat, sizeof(sustat)))
		ret = -EFAULT;
	return ret;
}

static ssize_t
nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
			 void *buf, size_t size, size_t nmembs)
{
	return nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
}

static int nilfs_ioctl_get_vinfo(struct inode *inode, struct file *filp,
				 unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_argv argv;
	int ret;

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

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
				    nilfs_ioctl_do_get_vinfo);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &argv, sizeof(argv)))
		ret = -EFAULT;
	return ret;
}

static ssize_t
nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
			  void *buf, size_t size, size_t nmembs)
{
	struct inode *dat = nilfs_dat_inode(nilfs);
	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	struct nilfs_bdesc *bdescs = buf;
	int ret, i;

	for (i = 0; i < nmembs; i++) {
		ret = nilfs_bmap_lookup_at_level(bmap,
						 bdescs[i].bd_offset,
						 bdescs[i].bd_level + 1,
						 &bdescs[i].bd_blocknr);
		if (ret < 0) {
			if (ret != -ENOENT)
				return ret;
			bdescs[i].bd_blocknr = 0;
		}
	}
	return nmembs;
}

static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_argv argv;
	int ret;

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

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
				    nilfs_ioctl_do_get_bdescs);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &argv, sizeof(argv)))
		ret = -EFAULT;
	return ret;
}

static int nilfs_ioctl_move_inode_block(struct inode *inode,
					struct nilfs_vdesc *vdesc,
					struct list_head *buffers)
{
	struct buffer_head *bh;
	int ret;

	if (vdesc->vd_flags == 0)
		ret = nilfs_gccache_submit_read_data(
			inode, vdesc->vd_offset, vdesc->vd_blocknr,
			vdesc->vd_vblocknr, &bh);
	else
		ret = nilfs_gccache_submit_read_node(
			inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);

	if (unlikely(ret < 0)) {
		if (ret == -ENOENT)
			printk(KERN_CRIT
			       "%s: invalid virtual block address (%s): "
			       "ino=%llu, cno=%llu, offset=%llu, "
			       "blocknr=%llu, vblocknr=%llu\n",
			       __func__, vdesc->vd_flags ? "node" : "data",
			       (unsigned long long)vdesc->vd_ino,
			       (unsigned long long)vdesc->vd_cno,
			       (unsigned long long)vdesc->vd_offset,
			       (unsigned long long)vdesc->vd_blocknr,
			       (unsigned long long)vdesc->vd_vblocknr);
		return ret;
	}
	bh->b_private = vdesc;
	list_add_tail(&bh->b_assoc_buffers, buffers);
	return 0;
}

static ssize_t
nilfs_ioctl_do_move_blocks(struct the_nilfs *nilfs, __u64 *posp, int flags,
			   void *buf, size_t size, size_t nmembs)
{
	struct inode *inode;
	struct nilfs_vdesc *vdesc;
	struct buffer_head *bh, *n;
	LIST_HEAD(buffers);
	ino_t ino;
	__u64 cno;
	int i, ret;

	for (i = 0, vdesc = buf; i < nmembs; ) {
		ino = vdesc->vd_ino;
		cno = vdesc->vd_cno;
		inode = nilfs_gc_iget(nilfs, ino, cno);
		if (unlikely(inode == NULL)) {
			ret = -ENOMEM;
			goto failed;
		}
		do {
			ret = nilfs_ioctl_move_inode_block(inode, vdesc,
							   &buffers);
			if (unlikely(ret < 0))
				goto failed;
			vdesc++;
		} while (++i < nmembs &&
			 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
	}

	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
		ret = nilfs_gccache_wait_and_mark_dirty(bh);
		if (unlikely(ret < 0)) {
			if (ret == -EEXIST) {
				vdesc = bh->b_private;
				printk(KERN_CRIT
				       "%s: conflicting %s buffer: "
				       "ino=%llu, cno=%llu, offset=%llu, "
				       "blocknr=%llu, vblocknr=%llu\n",
				       __func__,
				       vdesc->vd_flags ? "node" : "data",
				       (unsigned long long)vdesc->vd_ino,
				       (unsigned long long)vdesc->vd_cno,
				       (unsigned long long)vdesc->vd_offset,
				       (unsigned long long)vdesc->vd_blocknr,
				       (unsigned long long)vdesc->vd_vblocknr);
			}
			goto failed;
		}
		list_del_init(&bh->b_assoc_buffers);
		bh->b_private = NULL;
		brelse(bh);
	}
	return nmembs;

 failed:
	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
		list_del_init(&bh->b_assoc_buffers);
		bh->b_private = NULL;
		brelse(bh);
	}
	return ret;
}

static inline int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
					  struct nilfs_argv *argv,
					  int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_move_blocks);
}

static ssize_t
nilfs_ioctl_do_delete_checkpoints(struct the_nilfs *nilfs, __u64 *posp,
				  int flags, void *buf, size_t size,
				  size_t nmembs)
{
	struct inode *cpfile = nilfs->ns_cpfile;
	struct nilfs_period *periods = buf;
	int ret, i;

	for (i = 0; i < nmembs; i++) {
		ret = nilfs_cpfile_delete_checkpoints(
			cpfile, periods[i].p_start, periods[i].p_end);
		if (ret < 0)
			return ret;
	}
	return nmembs;
}

static inline int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
						 struct nilfs_argv *argv,
						 int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_delete_checkpoints);
}

static ssize_t
nilfs_ioctl_do_free_vblocknrs(struct the_nilfs *nilfs, __u64 *posp, int flags,
			      void *buf, size_t size, size_t nmembs)
{
	int ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);

	return (ret < 0) ? ret : nmembs;
}

static inline int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
					     struct nilfs_argv *argv,
					     int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_free_vblocknrs);
}

static ssize_t
nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, __u64 *posp,
				 int flags, void *buf, size_t size,
				 size_t nmembs)
{
	struct inode *dat = nilfs_dat_inode(nilfs);
	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	struct nilfs_bdesc *bdescs = buf;
	int ret, i;

	for (i = 0; i < nmembs; i++) {
		/* XXX: use macro or inline func to check liveness */
		ret = nilfs_bmap_lookup_at_level(bmap,
						 bdescs[i].bd_offset,
						 bdescs[i].bd_level + 1,
						 &bdescs[i].bd_blocknr);
		if (ret < 0) {
			if (ret != -ENOENT)
				return ret;
			bdescs[i].bd_blocknr = 0;
		}
		if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
			/* skip dead block */
			continue;
		if (bdescs[i].bd_level == 0) {
			ret = nilfs_mdt_mark_block_dirty(dat,
							 bdescs[i].bd_offset);
			if (ret < 0) {
				BUG_ON(ret == -ENOENT);
				return ret;
			}
		} else {
			ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
					      bdescs[i].bd_level);
			if (ret < 0) {
				BUG_ON(ret == -ENOENT);
				return ret;
			}
		}
	}
	return nmembs;
}

static inline int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
						struct nilfs_argv *argv,
						int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_mark_blocks_dirty);
}

static ssize_t
nilfs_ioctl_do_free_segments(struct the_nilfs *nilfs, __u64 *posp, int flags,
			     void *buf, size_t size, size_t nmembs)
{
	struct nilfs_sb_info *sbi = nilfs_get_writer(nilfs);
	int ret;

	BUG_ON(!sbi);
	ret = nilfs_segctor_add_segments_to_be_freed(
		NILFS_SC(sbi), buf, nmembs);
	nilfs_put_writer(nilfs);

	return (ret < 0) ? ret : nmembs;
}

static inline int nilfs_ioctl_free_segments(struct the_nilfs *nilfs,
					     struct nilfs_argv *argv,
					     int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_free_segments);
}

int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
				       void __user *argp)
{
	struct nilfs_argv argv[5];
	int dir, ret;

	if (copy_from_user(argv, argp, sizeof(argv)))
		return -EFAULT;

	dir = _IOC_WRITE;
	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], dir);
	if (ret < 0)
		goto out_move_blks;
	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], dir);
	if (ret < 0)
		goto out_del_cps;
	ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], dir);
	if (ret < 0)
		goto out_free_vbns;
	ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], dir);
	if (ret < 0)
		goto out_free_vbns;
	ret = nilfs_ioctl_free_segments(nilfs, &argv[4], dir);
	if (ret < 0)
		goto out_free_segs;

	return 0;

 out_free_segs:
	BUG(); /* XXX: not implemented yet */
 out_free_vbns:
	BUG();/* XXX: not implemented yet */
 out_del_cps:
	BUG();/* XXX: not implemented yet */
 out_move_blks:
	nilfs_remove_all_gcinode(nilfs);
	return ret;
}

static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
				      unsigned int cmd, void __user *argp)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	return nilfs_clean_segments(inode->i_sb, argp);
}

static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
			    unsigned int cmd, void __user *argp)
{
	__u64 cno;
	int ret;

	ret = nilfs_construct_segment(inode->i_sb);
	if (ret < 0)
		return ret;

	if (argp != NULL) {
		cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
		if (copy_to_user(argp, &cno, sizeof(cno)))
			return -EFAULT;
	}
	return 0;
}

int nilfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
		unsigned long arg)
{
	void __user *argp = (void * __user *)arg;

	switch (cmd) {
	case NILFS_IOCTL_CHANGE_CPMODE:
		return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
	case NILFS_IOCTL_DELETE_CHECKPOINT:
		return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_CPINFO:
		return nilfs_ioctl_get_cpinfo(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_CPSTAT:
		return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_SUINFO:
		return nilfs_ioctl_get_suinfo(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_SUSTAT:
		return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_VINFO:
		/* XXX: rename to ??? */
		return nilfs_ioctl_get_vinfo(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_BDESCS:
		return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
	case NILFS_IOCTL_CLEAN_SEGMENTS:
		return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
	case NILFS_IOCTL_SYNC:
		return nilfs_ioctl_sync(inode, filp, cmd, argp);
	default:
		return -ENOTTY;
	}
}

/* compat_ioctl */
#ifdef CONFIG_COMPAT
#include <linux/compat.h>

static int nilfs_compat_locked_ioctl(struct inode *inode, struct file *filp,
				     unsigned int cmd, unsigned long arg)
{
	int ret;

	lock_kernel();
	ret = nilfs_ioctl(inode, filp, cmd, arg);
	unlock_kernel();
	return ret;
}

static int
nilfs_compat_ioctl_uargv32_to_uargv(struct nilfs_argv32 __user *uargv32,
				    struct nilfs_argv __user *uargv)
{
	compat_uptr_t base;
	compat_size_t nmembs, size;
	compat_int_t index, flags;

	if (get_user(base, &uargv32->v_base) ||
	    put_user(compat_ptr(base), &uargv->v_base) ||
	    get_user(nmembs, &uargv32->v_nmembs) ||
	    put_user(nmembs, &uargv->v_nmembs) ||
	    get_user(size, &uargv32->v_size) ||
	    put_user(size, &uargv->v_size) ||
	    get_user(index, &uargv32->v_index) ||
	    put_user(index, &uargv->v_index) ||
	    get_user(flags, &uargv32->v_flags) ||
	    put_user(flags, &uargv->v_flags))
		return -EFAULT;
	return 0;
}

static int
nilfs_compat_ioctl_uargv_to_uargv32(struct nilfs_argv __user *uargv,
				    struct nilfs_argv32 __user *uargv32)
{
	size_t nmembs;

	if (get_user(nmembs, &uargv->v_nmembs) ||
	    put_user(nmembs, &uargv32->v_nmembs))
		return -EFAULT;
	return 0;
}

static int
nilfs_compat_ioctl_get_by_argv(struct inode *inode, struct file *filp,
			       unsigned int cmd, unsigned long arg)
{
	struct nilfs_argv __user *uargv;
	struct nilfs_argv32 __user *uargv32;
	int ret;

	uargv = compat_alloc_user_space(sizeof(struct nilfs_argv));
	uargv32 = compat_ptr(arg);
	ret = nilfs_compat_ioctl_uargv32_to_uargv(uargv32, uargv);
	if (ret < 0)
		return ret;

	ret = nilfs_compat_locked_ioctl(inode, filp, cmd, (unsigned long)uargv);
	if (ret < 0)
		return ret;

	return nilfs_compat_ioctl_uargv_to_uargv32(uargv, uargv32);
}

static int
nilfs_compat_ioctl_change_cpmode(struct inode *inode, struct file *filp,
				 unsigned int cmd, unsigned long arg)
{
	struct nilfs_cpmode __user *ucpmode;
	struct nilfs_cpmode32 __user *ucpmode32;
	int mode;

	ucpmode = compat_alloc_user_space(sizeof(struct nilfs_cpmode));
	ucpmode32 = compat_ptr(arg);
	if (copy_in_user(&ucpmode->cm_cno, &ucpmode32->cm_cno,
			 sizeof(__u64)) ||
	    get_user(mode, &ucpmode32->cm_mode) ||
	    put_user(mode, &ucpmode->cm_mode))
		return -EFAULT;

	return nilfs_compat_locked_ioctl(
		inode, filp, cmd, (unsigned long)ucpmode);
}


static inline int
nilfs_compat_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
				     unsigned int cmd, unsigned long arg)
{
	return nilfs_compat_locked_ioctl(inode, filp, cmd, arg);
}

static inline int
nilfs_compat_ioctl_get_cpinfo(struct inode *inode, struct file *filp,
			      unsigned int cmd, unsigned long arg)
{
	return nilfs_compat_ioctl_get_by_argv(inode, filp, cmd, arg);
}

static inline int
nilfs_compat_ioctl_get_cpstat(struct inode *inode, struct file *filp,
			      unsigned int cmd, unsigned long arg)
{
	return nilfs_compat_locked_ioctl(inode, filp, cmd, arg);
}

static inline int
nilfs_compat_ioctl_get_suinfo(struct inode *inode, struct file *filp,
			      unsigned int cmd, unsigned long arg)
{
	return nilfs_compat_ioctl_get_by_argv(inode, filp, cmd, arg);
}

static int
nilfs_compat_ioctl_get_sustat(struct inode *inode, struct file *filp,
			      unsigned int cmd, unsigned long arg)
{
	struct nilfs_sustat __user *usustat;
	struct nilfs_sustat32 __user *usustat32;
	time_t ctime, nongc_ctime;
	int ret;

	usustat = compat_alloc_user_space(sizeof(struct nilfs_sustat));
	ret = nilfs_compat_locked_ioctl(inode, filp, cmd,
					(unsigned long)usustat);
	if (ret < 0)
		return ret;

	usustat32 = compat_ptr(arg);
	if (copy_in_user(&usustat32->ss_nsegs, &usustat->ss_nsegs,
			 sizeof(__u64)) ||
	    copy_in_user(&usustat32->ss_ncleansegs, &usustat->ss_ncleansegs,
			 sizeof(__u64)) ||
	    copy_in_user(&usustat32->ss_ndirtysegs, &usustat->ss_ndirtysegs,
			 sizeof(__u64)) ||
	    get_user(ctime, &usustat->ss_ctime) ||
	    put_user(ctime, &usustat32->ss_ctime) ||
	    get_user(nongc_ctime, &usustat->ss_nongc_ctime) ||
	    put_user(nongc_ctime, &usustat32->ss_nongc_ctime))
		return -EFAULT;
	return 0;
}

static inline int
nilfs_compat_ioctl_get_vinfo(struct inode *inode, struct file *filp,
			      unsigned int cmd, unsigned long arg)
{
	return nilfs_compat_ioctl_get_by_argv(inode, filp, cmd, arg);
}

static inline int
nilfs_compat_ioctl_get_bdescs(struct inode *inode, struct file *filp,
			     unsigned int cmd, unsigned long arg)
{
	return nilfs_compat_ioctl_get_by_argv(inode, filp, cmd, arg);
}

static int
nilfs_compat_ioctl_clean_segments(struct inode *inode, struct file *filp,
				  unsigned int cmd, unsigned long arg)
{
	struct nilfs_argv __user *uargv;
	struct nilfs_argv32 __user *uargv32;
	int i, ret;

	uargv = compat_alloc_user_space(sizeof(struct nilfs_argv) * 5);
	uargv32 = compat_ptr(arg);
	for (i = 0; i < 5; i++) {
		ret = nilfs_compat_ioctl_uargv32_to_uargv(&uargv32[i],
							  &uargv[i]);
		if (ret < 0)
			return ret;
	}
	return nilfs_compat_locked_ioctl(
		inode, filp, cmd, (unsigned long)uargv);
}

static int nilfs_compat_ioctl_sync(struct inode *inode, struct file *filp,
				   unsigned int cmd, unsigned long arg)
{
	return nilfs_compat_locked_ioctl(inode, filp, cmd, arg);
}

long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = filp->f_dentry->d_inode;

	switch (cmd) {
	case NILFS_IOCTL32_CHANGE_CPMODE:
		return nilfs_compat_ioctl_change_cpmode(
			inode, filp, NILFS_IOCTL_CHANGE_CPMODE, arg);
	case NILFS_IOCTL_DELETE_CHECKPOINT:
		return nilfs_compat_ioctl_delete_checkpoint(
			inode, filp, cmd, arg);
	case NILFS_IOCTL32_GET_CPINFO:
		return nilfs_compat_ioctl_get_cpinfo(
			inode, filp, NILFS_IOCTL_GET_CPINFO, arg);
	case NILFS_IOCTL_GET_CPSTAT:
		return nilfs_compat_ioctl_get_cpstat(inode, filp, cmd, arg);
	case NILFS_IOCTL32_GET_SUINFO:
		return nilfs_compat_ioctl_get_suinfo(
			inode, filp, NILFS_IOCTL_GET_SUINFO, arg);
	case NILFS_IOCTL32_GET_SUSTAT:
		return nilfs_compat_ioctl_get_sustat(
			inode, filp, NILFS_IOCTL_GET_SUSTAT, arg);
	case NILFS_IOCTL32_GET_VINFO:
		return nilfs_compat_ioctl_get_vinfo(
			inode, filp, NILFS_IOCTL_GET_VINFO, arg);
	case NILFS_IOCTL32_GET_BDESCS:
		return nilfs_compat_ioctl_get_bdescs(
			inode, filp, NILFS_IOCTL_GET_BDESCS, arg);
	case NILFS_IOCTL32_CLEAN_SEGMENTS:
		return nilfs_compat_ioctl_clean_segments(
			inode, filp, NILFS_IOCTL_CLEAN_SEGMENTS, arg);
	case NILFS_IOCTL_SYNC:
		return nilfs_compat_ioctl_sync(inode, filp, cmd, arg);
	default:
		return -ENOIOCTLCMD;
	}
}
#endif