aboutsummaryrefslogtreecommitdiffstats
path: root/cmds-fi-usage.c
blob: 04d68b18ce11db660c849df57b6b3c07bfc03242 (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
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <stdarg.h>
#include <getopt.h>

#include "utils.h"
#include "kerncompat.h"
#include "ctree.h"
#include "string-table.h"
#include "cmds-fi-usage.h"
#include "commands.h"

#include "version.h"

/*
 * Add the chunk info to the chunk_info list
 */
static int add_info_to_list(struct chunk_info **info_ptr,
			int *info_count,
			struct btrfs_chunk *chunk)
{

	u64 type = btrfs_stack_chunk_type(chunk);
	u64 size = btrfs_stack_chunk_length(chunk);
	int num_stripes = btrfs_stack_chunk_num_stripes(chunk);
	int j;

	for (j = 0 ; j < num_stripes ; j++) {
		int i;
		struct chunk_info *p = NULL;
		struct btrfs_stripe *stripe;
		u64    devid;

		stripe = btrfs_stripe_nr(chunk, j);
		devid = btrfs_stack_stripe_devid(stripe);

		for (i = 0 ; i < *info_count ; i++)
			if ((*info_ptr)[i].type == type &&
			    (*info_ptr)[i].devid == devid &&
			    (*info_ptr)[i].num_stripes == num_stripes ) {
				p = (*info_ptr) + i;
				break;
			}

		if (!p) {
			int tmp = sizeof(struct btrfs_chunk) * (*info_count + 1);
			struct chunk_info *res = realloc(*info_ptr, tmp);

			if (!res) {
				free(*info_ptr);
				error("not enough memory");
				return -ENOMEM;
			}

			*info_ptr = res;
			p = res + *info_count;
			(*info_count)++;

			p->devid = devid;
			p->type = type;
			p->size = 0;
			p->num_stripes = num_stripes;
		}

		p->size += size;

	}

	return 0;

}

/*
 *  Helper to sort the chunk type
 */
static int cmp_chunk_block_group(u64 f1, u64 f2)
{

	u64 mask;

	if ((f1 & BTRFS_BLOCK_GROUP_TYPE_MASK) ==
		(f2 & BTRFS_BLOCK_GROUP_TYPE_MASK))
			mask = BTRFS_BLOCK_GROUP_PROFILE_MASK;
	else if (f2 & BTRFS_BLOCK_GROUP_SYSTEM)
			return -1;
	else if (f1 & BTRFS_BLOCK_GROUP_SYSTEM)
			return +1;
	else
			mask = BTRFS_BLOCK_GROUP_TYPE_MASK;

	if ((f1 & mask) > (f2 & mask))
		return +1;
	else if ((f1 & mask) < (f2 & mask))
		return -1;
	else
		return 0;
}

/*
 * Helper to sort the chunk
 */
static int cmp_chunk_info(const void *a, const void *b)
{
	return cmp_chunk_block_group(
		((struct chunk_info *)a)->type,
		((struct chunk_info *)b)->type);
}

static int load_chunk_info(int fd, struct chunk_info **info_ptr, int *info_count)
{
	int ret;
	struct btrfs_ioctl_search_args args;
	struct btrfs_ioctl_search_key *sk = &args.key;
	struct btrfs_ioctl_search_header *sh;
	unsigned long off = 0;
	int i, e;

	memset(&args, 0, sizeof(args));

	/*
	 * there may be more than one ROOT_ITEM key if there are
	 * snapshots pending deletion, we have to loop through
	 * them.
	 */
	sk->tree_id = BTRFS_CHUNK_TREE_OBJECTID;

	sk->min_objectid = 0;
	sk->max_objectid = (u64)-1;
	sk->max_type = 0;
	sk->min_type = (u8)-1;
	sk->min_offset = 0;
	sk->max_offset = (u64)-1;
	sk->min_transid = 0;
	sk->max_transid = (u64)-1;
	sk->nr_items = 4096;

	while (1) {
		ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
		e = errno;
		if (e == EPERM)
			return -e;

		if (ret < 0) {
			error("cannot look up chunk tree info: %s",
				strerror(e));
			return 1;
		}
		/* the ioctl returns the number of item it found in nr_items */

		if (sk->nr_items == 0)
			break;

		off = 0;
		for (i = 0; i < sk->nr_items; i++) {
			struct btrfs_chunk *item;
			sh = (struct btrfs_ioctl_search_header *)(args.buf +
								  off);

			off += sizeof(*sh);
			item = (struct btrfs_chunk *)(args.buf + off);

			ret = add_info_to_list(info_ptr, info_count, item);
			if (ret) {
				*info_ptr = NULL;
				return 1;
			}

			off += btrfs_search_header_len(sh);

			sk->min_objectid = btrfs_search_header_objectid(sh);
			sk->min_type = btrfs_search_header_type(sh);
			sk->min_offset = btrfs_search_header_offset(sh)+1;

		}
		if (!sk->min_offset)	/* overflow */
			sk->min_type++;
		else
			continue;

		if (!sk->min_type)
			sk->min_objectid++;
		 else
			continue;

		if (!sk->min_objectid)
			break;
	}

	qsort(*info_ptr, *info_count, sizeof(struct chunk_info),
		cmp_chunk_info);

	return 0;
}

/*
 * Helper to sort the struct btrfs_ioctl_space_info
 */
static int cmp_btrfs_ioctl_space_info(const void *a, const void *b)
{
	return cmp_chunk_block_group(
		((struct btrfs_ioctl_space_info *)a)->flags,
		((struct btrfs_ioctl_space_info *)b)->flags);
}

/*
 * This function load all the information about the space usage
 */
static struct btrfs_ioctl_space_args *load_space_info(int fd, char *path)
{
	struct btrfs_ioctl_space_args *sargs = NULL, *sargs_orig = NULL;
	int ret, count;

	sargs_orig = sargs = calloc(1, sizeof(struct btrfs_ioctl_space_args));
	if (!sargs) {
		error("not enough memory");
		return NULL;
	}

	sargs->space_slots = 0;
	sargs->total_spaces = 0;

	ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
	if (ret < 0) {
		error("cannot get space info on '%s': %s", path,
			strerror(errno));
		free(sargs);
		return NULL;
	}
	if (!sargs->total_spaces) {
		free(sargs);
		printf("No chunks found\n");
		return NULL;
	}

	count = sargs->total_spaces;

	sargs = realloc(sargs, sizeof(struct btrfs_ioctl_space_args) +
			(count * sizeof(struct btrfs_ioctl_space_info)));
	if (!sargs) {
		free(sargs_orig);
		error("not enough memory");
		return NULL;
	}

	sargs->space_slots = count;
	sargs->total_spaces = 0;

	ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
	if (ret < 0) {
		error("cannot get space info with %u slots: %s",
			count, strerror(errno));
		free(sargs);
		return NULL;
	}

	qsort(&(sargs->spaces), count, sizeof(struct btrfs_ioctl_space_info),
		cmp_btrfs_ioctl_space_info);

	return sargs;
}

/*
 * This function computes the space occupied by a *single* RAID5/RAID6 chunk.
 * The computation is performed on the basis of the number of stripes
 * which compose the chunk, which could be different from the number of devices
 * if a disk is added later.
 */
static void get_raid56_used(int fd, struct chunk_info *chunks, int chunkcount,
		u64 *raid5_used, u64 *raid6_used)
{
	struct chunk_info *info_ptr = chunks;
	*raid5_used = 0;
	*raid6_used = 0;

	while (chunkcount-- > 0) {
		if (info_ptr->type & BTRFS_BLOCK_GROUP_RAID5)
			(*raid5_used) += info_ptr->size / (info_ptr->num_stripes - 1);
		if (info_ptr->type & BTRFS_BLOCK_GROUP_RAID6)
			(*raid6_used) += info_ptr->size / (info_ptr->num_stripes - 2);
		info_ptr++;
	}
}

#define	MIN_UNALOCATED_THRESH	(16 * 1024 * 1024)
static int print_filesystem_usage_overall(int fd, struct chunk_info *chunkinfo,
		int chunkcount, struct device_info *devinfo, int devcount,
		char *path, unsigned unit_mode)
{
	struct btrfs_ioctl_space_args *sargs = NULL;
	int i;
	int ret = 0;
	int width = 10;		/* default 10 for human units */
	/*
	 * r_* prefix is for raw data
	 * l_* is for logical
	 */
	u64 r_total_size = 0;	/* filesystem size, sum of device sizes */
	u64 r_total_chunks = 0;	/* sum of chunks sizes on disk(s) */
	u64 r_total_used = 0;
	u64 r_total_unused = 0;
	u64 r_total_missing = 0;	/* sum of missing devices size */
	u64 r_data_used = 0;
	u64 r_data_chunks = 0;
	u64 l_data_chunks = 0;
	u64 r_metadata_used = 0;
	u64 r_metadata_chunks = 0;
	u64 l_metadata_chunks = 0;
	u64 r_system_used = 0;
	u64 r_system_chunks = 0;
	double data_ratio;
	double metadata_ratio;
	/* logical */
	u64 raid5_used = 0;
	u64 raid6_used = 0;
	u64 l_global_reserve = 0;
	u64 l_global_reserve_used = 0;
	u64 free_estimated = 0;
	u64 free_min = 0;
	int max_data_ratio = 1;
	int mixed = 0;

	sargs = load_space_info(fd, path);
	if (!sargs) {
		ret = 1;
		goto exit;
	}

	r_total_size = 0;
	for (i = 0; i < devcount; i++) {
		r_total_size += devinfo[i].size;
		if (!devinfo[i].device_size)
			r_total_missing += devinfo[i].size;
	}

	if (r_total_size == 0) {
		error("cannot get space info on '%s': %s",
			path, strerror(errno));

		ret = 1;
		goto exit;
	}
	get_raid56_used(fd, chunkinfo, chunkcount, &raid5_used, &raid6_used);

	for (i = 0; i < sargs->total_spaces; i++) {
		int ratio;
		u64 flags = sargs->spaces[i].flags;

		/*
		 * The raid5/raid6 ratio depends by the stripes number
		 * used by every chunk. It is computed separately
		 */
		if (flags & BTRFS_BLOCK_GROUP_RAID0)
			ratio = 1;
		else if (flags & BTRFS_BLOCK_GROUP_RAID1)
			ratio = 2;
		else if (flags & BTRFS_BLOCK_GROUP_RAID5)
			ratio = 0;
		else if (flags & BTRFS_BLOCK_GROUP_RAID6)
			ratio = 0;
		else if (flags & BTRFS_BLOCK_GROUP_DUP)
			ratio = 2;
		else if (flags & BTRFS_BLOCK_GROUP_RAID10)
			ratio = 2;
		else
			ratio = 1;

		if (!ratio)
			warning("RAID56 detected, not implemented");

		if (ratio > max_data_ratio)
			max_data_ratio = ratio;

		if (flags & BTRFS_SPACE_INFO_GLOBAL_RSV) {
			l_global_reserve = sargs->spaces[i].total_bytes;
			l_global_reserve_used = sargs->spaces[i].used_bytes;
		}
		if ((flags & (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA))
		    == (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA)) {
			mixed = 1;
		}
		if (flags & BTRFS_BLOCK_GROUP_DATA) {
			r_data_used += sargs->spaces[i].used_bytes * ratio;
			r_data_chunks += sargs->spaces[i].total_bytes * ratio;
			l_data_chunks += sargs->spaces[i].total_bytes;
		}
		if (flags & BTRFS_BLOCK_GROUP_METADATA) {
			r_metadata_used += sargs->spaces[i].used_bytes * ratio;
			r_metadata_chunks += sargs->spaces[i].total_bytes * ratio;
			l_metadata_chunks += sargs->spaces[i].total_bytes;
		}
		if (flags & BTRFS_BLOCK_GROUP_SYSTEM) {
			r_system_used += sargs->spaces[i].used_bytes * ratio;
			r_system_chunks += sargs->spaces[i].total_bytes * ratio;
		}
	}

	r_total_chunks = r_data_chunks + r_system_chunks;
	r_total_used = r_data_used + r_system_used;
	if (!mixed) {
		r_total_chunks += r_metadata_chunks;
		r_total_used += r_metadata_used;
	}
	r_total_unused = r_total_size - r_total_chunks;

	/* Raw / Logical = raid factor, >= 1 */
	data_ratio = (double)r_data_chunks / l_data_chunks;
	if (mixed)
		metadata_ratio = data_ratio;
	else
		metadata_ratio = (double)r_metadata_chunks / l_metadata_chunks;

#if 0
	/* add the raid5/6 allocated space */
	total_chunks += raid5_used + raid6_used;
#endif

	/*
	 * We're able to fill at least DATA for the unused space
	 *
	 * With mixed raid levels, this gives a rough estimate but more
	 * accurate than just counting the logical free space
	 * (l_data_chunks - l_data_used)
	 *
	 * In non-mixed case there's no difference.
	 */
	free_estimated = (r_data_chunks - r_data_used) / data_ratio;
	/*
	 * For mixed-bg the metadata are left out in calculations thus global
	 * reserve would be lost. Part of it could be permanently allocated,
	 * we have to subtract the used bytes so we don't go under zero free.
	 */
	if (mixed)
		free_estimated -= l_global_reserve - l_global_reserve_used;
	free_min = free_estimated;

	/* Chop unallocatable space */
	/* FIXME: must be applied per device */
	if (r_total_unused >= MIN_UNALOCATED_THRESH) {
		free_estimated += r_total_unused / data_ratio;
		/* Match the calculation of 'df', use the highest raid ratio */
		free_min += r_total_unused / max_data_ratio;
	}

	if (unit_mode != UNITS_HUMAN)
		width = 18;

	printf("Overall:\n");

	printf("    Device size:\t\t%*s\n", width,
		pretty_size_mode(r_total_size, unit_mode));
	printf("    Device allocated:\t\t%*s\n", width,
		pretty_size_mode(r_total_chunks, unit_mode));
	printf("    Device unallocated:\t\t%*s\n", width,
		pretty_size_mode(r_total_unused, unit_mode));
	printf("    Device missing:\t\t%*s\n", width,
		pretty_size_mode(r_total_missing, unit_mode));
	printf("    Used:\t\t\t%*s\n", width,
		pretty_size_mode(r_total_used, unit_mode));
	printf("    Free (estimated):\t\t%*s\t(",
		width,
		pretty_size_mode(free_estimated, unit_mode));
	printf("min: %s)\n", pretty_size_mode(free_min, unit_mode));
	printf("    Data ratio:\t\t\t%*.2f\n",
		width, data_ratio);
	printf("    Metadata ratio:\t\t%*.2f\n",
		width, metadata_ratio);
	printf("    Global reserve:\t\t%*s\t(used: %s)\n", width,
		pretty_size_mode(l_global_reserve, unit_mode),
		pretty_size_mode(l_global_reserve_used, unit_mode));

exit:

	if (sargs)
		free(sargs);

	return ret;
}

/*
 *  Helper to sort the device_info structure
 */
static int cmp_device_info(const void *a, const void *b)
{
	return strcmp(((struct device_info *)a)->path,
			((struct device_info *)b)->path);
}

/*
 *  This function loads the device_info structure and put them in an array
 */
static int load_device_info(int fd, struct device_info **device_info_ptr,
			   int *device_info_count)
{
	int ret, i, ndevs;
	struct btrfs_ioctl_fs_info_args fi_args;
	struct btrfs_ioctl_dev_info_args dev_info;
	struct device_info *info;

	*device_info_count = 0;
	*device_info_ptr = NULL;

	ret = ioctl(fd, BTRFS_IOC_FS_INFO, &fi_args);
	if (ret < 0) {
		if (errno == EPERM)
			return -errno;
		error("cannot get filesystem info: %s",
				strerror(errno));
		return 1;
	}

	info = calloc(fi_args.num_devices, sizeof(struct device_info));
	if (!info) {
		error("not enough memory");
		return 1;
	}

	for (i = 0, ndevs = 0 ; i <= fi_args.max_id ; i++) {
		BUG_ON(ndevs >= fi_args.num_devices);
		memset(&dev_info, 0, sizeof(dev_info));
		ret = get_device_info(fd, i, &dev_info);

		if (ret == -ENODEV)
			continue;
		if (ret) {
			error("cannot get info about device devid=%d", i);
			free(info);
			return ret;
		}

		info[ndevs].devid = dev_info.devid;
		if (!dev_info.path[0]) {
			strcpy(info[ndevs].path, "missing");
		} else {
			strcpy(info[ndevs].path, (char *)dev_info.path);
			info[ndevs].device_size =
				get_partition_size((char *)dev_info.path);
		}
		info[ndevs].size = dev_info.total_bytes;
		++ndevs;
	}

	BUG_ON(ndevs != fi_args.num_devices);
	qsort(info, fi_args.num_devices,
		sizeof(struct device_info), cmp_device_info);

	*device_info_count = fi_args.num_devices;
	*device_info_ptr = info;

	return 0;
}

int load_chunk_and_device_info(int fd, struct chunk_info **chunkinfo,
		int *chunkcount, struct device_info **devinfo, int *devcount)
{
	int ret;

	ret = load_chunk_info(fd, chunkinfo, chunkcount);
	if (ret == -EPERM) {
		warning(
"cannot read detailed chunk info, RAID5/6 numbers will be incorrect, run as root");
	} else if (ret) {
		return ret;
	}

	ret = load_device_info(fd, devinfo, devcount);
	if (ret == -EPERM) {
		warning(
		"cannot get filesystem info from ioctl(FS_INFO), run as root");
		ret = 0;
	}

	return ret;
}

/*
 *  This function computes the size of a chunk in a disk
 */
static u64 calc_chunk_size(struct chunk_info *ci)
{
	if (ci->type & BTRFS_BLOCK_GROUP_RAID0)
		return ci->size / ci->num_stripes;
	else if (ci->type & BTRFS_BLOCK_GROUP_RAID1)
		return ci->size ;
	else if (ci->type & BTRFS_BLOCK_GROUP_DUP)
		return ci->size ;
	else if (ci->type & BTRFS_BLOCK_GROUP_RAID5)
		return ci->size / (ci->num_stripes -1);
	else if (ci->type & BTRFS_BLOCK_GROUP_RAID6)
		return ci->size / (ci->num_stripes -2);
	else if (ci->type & BTRFS_BLOCK_GROUP_RAID10)
		return ci->size / ci->num_stripes;
	return ci->size;
}

/*
 *  This function print the results of the command "btrfs fi usage"
 *  in tabular format
 */
static void _cmd_filesystem_usage_tabular(unsigned unit_mode,
					struct btrfs_ioctl_space_args *sargs,
					struct chunk_info *chunks_info_ptr,
					int chunks_info_count,
					struct device_info *device_info_ptr,
					int device_info_count)
{
	int i;
	u64 total_unused = 0;
	struct string_table *matrix = NULL;
	int  ncols, nrows;
	int col;
	int unallocated_col;
	int spaceinfos_col;
	const int vhdr_skip = 3;	/* amount of vertical header space */

	/* id, path, unallocated */
	ncols = 3;
	spaceinfos_col = 2;
	/* Properly count the real space infos */
	for (i = 0; i < sargs->total_spaces; i++) {
		if (sargs->spaces[i].flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
			continue;
		ncols++;
	}

	/* 2 for header, empty line, devices, ===, total, used */
	nrows = vhdr_skip + device_info_count + 1 + 2;

	matrix = table_create(ncols, nrows);
	if (!matrix) {
		error("not enough memory");
		return;
	}

	/*
	 * We have to skip the global block reserve everywhere as it's an
	 * artificial blockgroup
	 */

	/* header */
	for (i = 0, col = spaceinfos_col; i < sargs->total_spaces; i++) {
		u64 flags = sargs->spaces[i].flags;

		if (flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
			continue;

		table_printf(matrix, col, 0, "<%s",
				btrfs_group_type_str(flags));
		table_printf(matrix, col, 1, "<%s",
				btrfs_group_profile_str(flags));
		col++;
	}
	unallocated_col = col;

	table_printf(matrix, 0, 1, "<Id");
	table_printf(matrix, 1, 1, "<Path");
	table_printf(matrix, unallocated_col, 1, "<Unallocated");

	/* body */
	for (i = 0; i < device_info_count; i++) {
		int k;
		char *p;

		u64  total_allocated = 0, unused;

		p = strrchr(device_info_ptr[i].path, '/');
		if (!p)
			p = device_info_ptr[i].path;
		else
			p++;

		table_printf(matrix, 0, vhdr_skip + i, ">%llu",
				device_info_ptr[i].devid);
		table_printf(matrix, 1, vhdr_skip + i, "<%s",
				device_info_ptr[i].path);

		for (col = spaceinfos_col, k = 0; k < sargs->total_spaces; k++) {
			u64	flags = sargs->spaces[k].flags;
			u64 devid = device_info_ptr[i].devid;
			int	j;
			u64 size = 0;

			if (flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
				continue;

			for (j = 0 ; j < chunks_info_count ; j++) {
				if (chunks_info_ptr[j].type != flags )
						continue;
				if (chunks_info_ptr[j].devid != devid)
						continue;

				size += calc_chunk_size(chunks_info_ptr+j);
			}

			if (size)
				table_printf(matrix, col, vhdr_skip+ i,
					">%s", pretty_size_mode(size, unit_mode));
			else
				table_printf(matrix, col, vhdr_skip + i, ">-");

			total_allocated += size;
			col++;
		}

		unused = get_partition_size(device_info_ptr[i].path)
				- total_allocated;

		table_printf(matrix, unallocated_col, vhdr_skip + i,
			       ">%s", pretty_size_mode(unused, unit_mode));
		total_unused += unused;

	}

	for (i = 0; i < spaceinfos_col; i++) {
		table_printf(matrix, i, vhdr_skip - 1, "*-");
		table_printf(matrix, i, vhdr_skip + device_info_count, "*-");
	}

	for (i = 0, col = spaceinfos_col; i < sargs->total_spaces; i++) {
		if (sargs->spaces[i].flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
			continue;

		table_printf(matrix, col, vhdr_skip - 1, "*-");
		table_printf(matrix, col, vhdr_skip + device_info_count, "*-");
		col++;
	}
	/* One for Unallocated */
	table_printf(matrix, col, vhdr_skip - 1, "*-");
	table_printf(matrix, col, vhdr_skip + device_info_count, "*-");

	/* footer */
	table_printf(matrix, 1, vhdr_skip + device_info_count + 1, "<Total");
	for (i = 0, col = spaceinfos_col; i < sargs->total_spaces; i++) {
		if (sargs->spaces[i].flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
			continue;

		table_printf(matrix, col++, vhdr_skip + device_info_count + 1,
			">%s",
			pretty_size_mode(sargs->spaces[i].total_bytes, unit_mode));
	}

	table_printf(matrix, unallocated_col, vhdr_skip + device_info_count + 1,
			">%s", pretty_size_mode(total_unused, unit_mode));

	table_printf(matrix, 1, vhdr_skip + device_info_count + 2, "<Used");
	for (i = 0, col = spaceinfos_col; i < sargs->total_spaces; i++) {
		if (sargs->spaces[i].flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
			continue;

		table_printf(matrix, col++, vhdr_skip + device_info_count + 2,
			">%s",
			pretty_size_mode(sargs->spaces[i].used_bytes, unit_mode));
	}

	table_dump(matrix);
	table_free(matrix);
}

/*
 *  This function prints the unused space per every disk
 */
static void print_unused(struct chunk_info *info_ptr,
			  int info_count,
			  struct device_info *device_info_ptr,
			  int device_info_count,
			  unsigned unit_mode)
{
	int i;
	for (i = 0; i < device_info_count; i++) {
		int	j;
		u64	total = 0;

		for (j = 0; j < info_count; j++)
			if (info_ptr[j].devid == device_info_ptr[i].devid)
				total += calc_chunk_size(info_ptr+j);

		printf("   %s\t%10s\n",
			device_info_ptr[i].path,
			pretty_size_mode(device_info_ptr[i].size - total,
				unit_mode));
	}
}

/*
 *  This function prints the allocated chunk per every disk
 */
static void print_chunk_device(u64 chunk_type,
				struct chunk_info *chunks_info_ptr,
				int chunks_info_count,
				struct device_info *device_info_ptr,
				int device_info_count,
				unsigned unit_mode)
{
	int i;

	for (i = 0; i < device_info_count; i++) {
		int	j;
		u64	total = 0;

		for (j = 0; j < chunks_info_count; j++) {

			if (chunks_info_ptr[j].type != chunk_type)
				continue;
			if (chunks_info_ptr[j].devid != device_info_ptr[i].devid)
				continue;

			total += calc_chunk_size(&(chunks_info_ptr[j]));
			//total += chunks_info_ptr[j].size;
		}

		if (total > 0)
			printf("   %s\t%10s\n",
				device_info_ptr[i].path,
				pretty_size_mode(total, unit_mode));
	}
}

/*
 *  This function print the results of the command "btrfs fi usage"
 *  in linear format
 */
static void _cmd_filesystem_usage_linear(unsigned unit_mode,
					struct btrfs_ioctl_space_args *sargs,
					struct chunk_info *info_ptr,
					int info_count,
					struct device_info *device_info_ptr,
					int device_info_count)
{
	int i;

	for (i = 0; i < sargs->total_spaces; i++) {
		const char *description;
		const char *r_mode;
		u64 flags = sargs->spaces[i].flags;

		if (flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
			continue;

		description = btrfs_group_type_str(flags);
		r_mode = btrfs_group_profile_str(flags);

		printf("%s,%s: Size:%s, ",
			description,
			r_mode,
			pretty_size_mode(sargs->spaces[i].total_bytes,
				unit_mode));
		printf("Used:%s\n",
			pretty_size_mode(sargs->spaces[i].used_bytes, unit_mode));
		print_chunk_device(flags, info_ptr, info_count,
				device_info_ptr, device_info_count, unit_mode);
		printf("\n");
	}

	printf("Unallocated:\n");
	print_unused(info_ptr, info_count, device_info_ptr, device_info_count,
			unit_mode);
}

static int print_filesystem_usage_by_chunk(int fd,
		struct chunk_info *chunkinfo, int chunkcount,
		struct device_info *devinfo, int devcount,
		char *path, unsigned unit_mode, int tabular)
{
	struct btrfs_ioctl_space_args *sargs;
	int ret = 0;

	if (!chunkinfo)
		return 0;

	sargs = load_space_info(fd, path);
	if (!sargs) {
		ret = 1;
		goto out;
	}

	if (tabular)
		_cmd_filesystem_usage_tabular(unit_mode, sargs, chunkinfo,
				chunkcount, devinfo, devcount);
	else
		_cmd_filesystem_usage_linear(unit_mode, sargs, chunkinfo,
				chunkcount, devinfo, devcount);

	free(sargs);
out:
	return ret;
}

const char * const cmd_filesystem_usage_usage[] = {
	"btrfs filesystem usage [options] <path> [<path>..]",
	"Show detailed information about internal filesystem usage .",
	HELPINFO_UNITS_SHORT_LONG,
	"-T                 show data in tabular format",
	NULL
};

int cmd_filesystem_usage(int argc, char **argv)
{
	int ret = 0;
	unsigned unit_mode;
	int i;
	int more_than_one = 0;
	int tabular = 0;

	unit_mode = get_unit_mode_from_arg(&argc, argv, 1);

	while (1) {
		int c;

		c = getopt(argc, argv, "T");
		if (c < 0)
			break;

		switch (c) {
		case 'T':
			tabular = 1;
			break;
		default:
			usage(cmd_filesystem_usage_usage);
		}
	}

	if (check_argc_min(argc - optind, 1))
		usage(cmd_filesystem_usage_usage);

	for (i = optind; i < argc; i++) {
		int fd;
		DIR *dirstream = NULL;
		struct chunk_info *chunkinfo = NULL;
		struct device_info *devinfo = NULL;
		int chunkcount = 0;
		int devcount = 0;

		fd = btrfs_open_dir(argv[i], &dirstream, 1);
		if (fd < 0) {
			ret = 1;
			goto out;
		}
		if (more_than_one)
			printf("\n");

		ret = load_chunk_and_device_info(fd, &chunkinfo, &chunkcount,
				&devinfo, &devcount);
		if (ret)
			goto cleanup;

		ret = print_filesystem_usage_overall(fd, chunkinfo, chunkcount,
				devinfo, devcount, argv[i], unit_mode);
		if (ret)
			goto cleanup;
		printf("\n");
		ret = print_filesystem_usage_by_chunk(fd, chunkinfo, chunkcount,
				devinfo, devcount, argv[i], unit_mode, tabular);
cleanup:
		close_file_or_dir(fd, dirstream);
		free(chunkinfo);
		free(devinfo);

		if (ret)
			goto out;
		more_than_one = 1;
	}

out:
	return !!ret;
}

void print_device_chunks(int fd, struct device_info *devinfo,
		struct chunk_info *chunks_info_ptr,
		int chunks_info_count, unsigned unit_mode)
{
	int i;
	u64 allocated = 0;

	for (i = 0 ; i < chunks_info_count ; i++) {
		const char *description;
		const char *r_mode;
		u64 flags;
		u64 size;

		if (chunks_info_ptr[i].devid != devinfo->devid)
			continue;

		flags = chunks_info_ptr[i].type;

		description = btrfs_group_type_str(flags);
		r_mode = btrfs_group_profile_str(flags);
		size = calc_chunk_size(chunks_info_ptr+i);
		printf("   %s,%s:%*s%10s\n",
			description,
			r_mode,
			(int)(20 - strlen(description) - strlen(r_mode)), "",
			pretty_size_mode(size, unit_mode));

		allocated += size;

	}
	printf("   Unallocated: %*s%10s\n",
		(int)(20 - strlen("Unallocated")), "",
		pretty_size_mode(devinfo->size - allocated, unit_mode));
}

void print_device_sizes(int fd, struct device_info *devinfo, unsigned unit_mode)
{
	printf("   Device size: %*s%10s\n",
		(int)(20 - strlen("Device size")), "",
		pretty_size_mode(devinfo->device_size, unit_mode));
	printf("   Device slack: %*s%10s\n",
		(int)(20 - strlen("Device slack")), "",
		pretty_size_mode(devinfo->device_size - devinfo->size,
			unit_mode));
}