summaryrefslogtreecommitdiff
path: root/cmds-balance.c
blob: d7f81482be2d18b58a35d05c1415996a0a69719e (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
/*
 * 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 <getopt.h>
#include <sys/ioctl.h>
#include <errno.h>

#include "kerncompat.h"
#include "ctree.h"
#include "ioctl.h"
#include "volumes.h"

#include "commands.h"
#include "utils.h"

static const char * const balance_cmd_group_usage[] = {
	"btrfs balance <command> [options] <path>",
	"btrfs balance <path>",
	NULL
};

static int parse_one_profile(const char *profile, u64 *flags)
{
	if (!strcmp(profile, "raid0")) {
		*flags |= BTRFS_BLOCK_GROUP_RAID0;
	} else if (!strcmp(profile, "raid1")) {
		*flags |= BTRFS_BLOCK_GROUP_RAID1;
	} else if (!strcmp(profile, "raid10")) {
		*flags |= BTRFS_BLOCK_GROUP_RAID10;
	} else if (!strcmp(profile, "raid5")) {
		*flags |= BTRFS_BLOCK_GROUP_RAID5;
	} else if (!strcmp(profile, "raid6")) {
		*flags |= BTRFS_BLOCK_GROUP_RAID6;
	} else if (!strcmp(profile, "dup")) {
		*flags |= BTRFS_BLOCK_GROUP_DUP;
	} else if (!strcmp(profile, "single")) {
		*flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
	} else {
		fprintf(stderr, "Unknown profile '%s'\n", profile);
		return 1;
	}

	return 0;
}

static int parse_profiles(char *profiles, u64 *flags)
{
	char *this_char;
	char *save_ptr = NULL; /* Satisfy static checkers */

	for (this_char = strtok_r(profiles, "|", &save_ptr);
	     this_char != NULL;
	     this_char = strtok_r(NULL, "|", &save_ptr)) {
		if (parse_one_profile(this_char, flags))
			return 1;
	}

	return 0;
}

static int parse_u64(const char *str, u64 *result)
{
	char *endptr;
	u64 val;

	val = strtoull(str, &endptr, 10);
	if (*endptr)
		return 1;

	*result = val;
	return 0;
}

/*
 * Parse range that's missing some part that can be implicit:
 * a..b	- exact range, a can be equal to b
 * a..	- implicitly unbounded maximum (end == (u64)-1)
 * ..b	- implicitly starting at 0
 * a	- invalid; unclear semantics, use parse_u64 instead
 *
 * Returned values are u64, value validation and interpretation should be done
 * by the caller.
 */
static int parse_range(const char *range, u64 *start, u64 *end)
{
	char *dots;
	char *endptr;
	const char *rest;
	int skipped = 0;

	dots = strstr(range, "..");
	if (!dots)
		return 1;

	rest = dots + 2;

	if (!*rest) {
		*end = (u64)-1;
		skipped++;
	} else {
		*end = strtoull(rest, &endptr, 10);
		if (*endptr)
			return 1;
	}
	if (dots == range) {
		*start = 0;
		skipped++;
	} else {
		*end = strtoull(range, &endptr, 10);
		if (*endptr != 0 && *endptr != '.')
			return 1;
	}

	if (*start >= *end) {
		fprintf(stderr, "Range %llu..%llu doesn't make "
			"sense\n", (unsigned long long)*start,
			(unsigned long long)*end);
		return 1;
	}

	if (skipped <= 1)
		return 0;

	return 1;
}

static int parse_filters(char *filters, struct btrfs_balance_args *args)
{
	char *this_char;
	char *value;
	char *save_ptr = NULL; /* Satisfy static checkers */

	if (!filters)
		return 0;

	for (this_char = strtok_r(filters, ",", &save_ptr);
	     this_char != NULL;
	     this_char = strtok_r(NULL, ",", &save_ptr)) {
		if ((value = strchr(this_char, '=')) != NULL)
			*value++ = 0;
		if (!strcmp(this_char, "profiles")) {
			if (!value || !*value) {
				fprintf(stderr, "the profiles filter requires "
				       "an argument\n");
				return 1;
			}
			if (parse_profiles(value, &args->profiles)) {
				fprintf(stderr, "Invalid profiles argument\n");
				return 1;
			}
			args->flags |= BTRFS_BALANCE_ARGS_PROFILES;
		} else if (!strcmp(this_char, "usage")) {
			if (!value || !*value) {
				fprintf(stderr, "the usage filter requires "
				       "an argument\n");
				return 1;
			}
			if (parse_u64(value, &args->usage) ||
			    args->usage > 100) {
				fprintf(stderr, "Invalid usage argument: %s\n",
				       value);
				return 1;
			}
			args->flags |= BTRFS_BALANCE_ARGS_USAGE;
		} else if (!strcmp(this_char, "devid")) {
			if (!value || !*value) {
				fprintf(stderr, "the devid filter requires "
				       "an argument\n");
				return 1;
			}
			if (parse_u64(value, &args->devid) ||
			    args->devid == 0) {
				fprintf(stderr, "Invalid devid argument: %s\n",
				       value);
				return 1;
			}
			args->flags |= BTRFS_BALANCE_ARGS_DEVID;
		} else if (!strcmp(this_char, "drange")) {
			if (!value || !*value) {
				fprintf(stderr, "the drange filter requires "
				       "an argument\n");
				return 1;
			}
			if (parse_range(value, &args->pstart, &args->pend)) {
				fprintf(stderr, "Invalid drange argument\n");
				return 1;
			}
			args->flags |= BTRFS_BALANCE_ARGS_DRANGE;
		} else if (!strcmp(this_char, "vrange")) {
			if (!value || !*value) {
				fprintf(stderr, "the vrange filter requires "
				       "an argument\n");
				return 1;
			}
			if (parse_range(value, &args->vstart, &args->vend)) {
				fprintf(stderr, "Invalid vrange argument\n");
				return 1;
			}
			args->flags |= BTRFS_BALANCE_ARGS_VRANGE;
		} else if (!strcmp(this_char, "convert")) {
			if (!value || !*value) {
				fprintf(stderr, "the convert option requires "
				       "an argument\n");
				return 1;
			}
			if (parse_one_profile(value, &args->target)) {
				fprintf(stderr, "Invalid convert argument\n");
				return 1;
			}
			args->flags |= BTRFS_BALANCE_ARGS_CONVERT;
		} else if (!strcmp(this_char, "soft")) {
			args->flags |= BTRFS_BALANCE_ARGS_SOFT;
		} else if (!strcmp(this_char, "limit")) {
			if (!value || !*value) {
				fprintf(stderr,
					"the limit filter requires an argument\n");
				return 1;
			}
			if (parse_u64(value, &args->limit)) {
				fprintf(stderr, "Invalid limit argument: %s\n",
				       value);
				return 1;
			}
			args->flags |= BTRFS_BALANCE_ARGS_LIMIT;
		} else {
			fprintf(stderr, "Unrecognized balance option '%s'\n",
				this_char);
			return 1;
		}
	}

	return 0;
}

static void dump_balance_args(struct btrfs_balance_args *args)
{
	if (args->flags & BTRFS_BALANCE_ARGS_CONVERT) {
		printf("converting, target=%llu, soft is %s",
		       (unsigned long long)args->target,
		       (args->flags & BTRFS_BALANCE_ARGS_SOFT) ? "on" : "off");
	} else {
		printf("balancing");
	}

	if (args->flags & BTRFS_BALANCE_ARGS_PROFILES)
		printf(", profiles=%llu", (unsigned long long)args->profiles);
	if (args->flags & BTRFS_BALANCE_ARGS_USAGE)
		printf(", usage=%llu", (unsigned long long)args->usage);
	if (args->flags & BTRFS_BALANCE_ARGS_DEVID)
		printf(", devid=%llu", (unsigned long long)args->devid);
	if (args->flags & BTRFS_BALANCE_ARGS_DRANGE)
		printf(", drange=%llu..%llu",
		       (unsigned long long)args->pstart,
		       (unsigned long long)args->pend);
	if (args->flags & BTRFS_BALANCE_ARGS_VRANGE)
		printf(", vrange=%llu..%llu",
		       (unsigned long long)args->vstart,
		       (unsigned long long)args->vend);
	if (args->flags & BTRFS_BALANCE_ARGS_LIMIT)
		printf(", limit=%llu", (unsigned long long)args->limit);

	printf("\n");
}

static void dump_ioctl_balance_args(struct btrfs_ioctl_balance_args *args)
{
	printf("Dumping filters: flags 0x%llx, state 0x%llx, force is %s\n",
	       (unsigned long long)args->flags, (unsigned long long)args->state,
	       (args->flags & BTRFS_BALANCE_FORCE) ? "on" : "off");
	if (args->flags & BTRFS_BALANCE_DATA) {
		printf("  DATA (flags 0x%llx): ",
		       (unsigned long long)args->data.flags);
		dump_balance_args(&args->data);
	}
	if (args->flags & BTRFS_BALANCE_METADATA) {
		printf("  METADATA (flags 0x%llx): ",
		       (unsigned long long)args->meta.flags);
		dump_balance_args(&args->meta);
	}
	if (args->flags & BTRFS_BALANCE_SYSTEM) {
		printf("  SYSTEM (flags 0x%llx): ",
		       (unsigned long long)args->sys.flags);
		dump_balance_args(&args->sys);
	}
}

static int do_balance_v1(int fd)
{
	struct btrfs_ioctl_vol_args args;
	int ret;

	memset(&args, 0, sizeof(args));
	ret = ioctl(fd, BTRFS_IOC_BALANCE, &args);
	return ret;
}

static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
		      int nofilters)
{
	int fd;
	int ret;
	int e;
	DIR *dirstream = NULL;

	fd = btrfs_open_dir(path, &dirstream, 1);
	if (fd < 0)
		return 1;

	ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, args);
	e = errno;

	if (ret < 0) {
		/*
		 * older kernels don't have the new balance ioctl, try the
		 * old one.  But, the old one doesn't know any filters, so
		 * don't fall back if they tried to use the fancy new things
		 */
		if (e == ENOTTY && nofilters) {
			ret = do_balance_v1(fd);
			if (ret == 0)
				goto out;
			e = errno;
		}

		if (e == ECANCELED) {
			if (args->state & BTRFS_BALANCE_STATE_PAUSE_REQ)
				fprintf(stderr, "balance paused by user\n");
			if (args->state & BTRFS_BALANCE_STATE_CANCEL_REQ)
				fprintf(stderr, "balance canceled by user\n");
			ret = 0;
		} else {
			fprintf(stderr, "ERROR: error during balancing '%s' "
				"- %s\n", path, strerror(e));
			if (e != EINPROGRESS)
				fprintf(stderr, "There may be more info in "
					"syslog - try dmesg | tail\n");
			ret = 1;
		}
	} else {
		printf("Done, had to relocate %llu out of %llu chunks\n",
		       (unsigned long long)args->stat.completed,
		       (unsigned long long)args->stat.considered);
		ret = 0;
	}

out:
	close_file_or_dir(fd, dirstream);
	return ret;
}

static const char * const cmd_balance_start_usage[] = {
	"btrfs balance start [options] <path>",
	"Balance chunks across the devices",
	"Balance and/or convert (change allocation profile of) chunks that",
	"passed all filters in a comma-separated list of filters for a",
	"particular chunk type.  If filter list is not given balance all",
	"chunks of that type.  In case none of the -d, -m or -s options is",
	"given balance all chunks in a filesystem.",
	"",
	"-d[filters]    act on data chunks",
	"-m[filters]    act on metadata chunks",
	"-s[filters]    act on system chunks (only under -f)",
	"-v             be verbose",
	"-f             force reducing of metadata integrity",
	NULL
};

static int cmd_balance_start(int argc, char **argv)
{
	struct btrfs_ioctl_balance_args args;
	struct btrfs_balance_args *ptrs[] = { &args.data, &args.sys,
						&args.meta, NULL };
	int force = 0;
	int verbose = 0;
	int nofilters = 1;
	int i;

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

	optind = 1;
	while (1) {
		static const struct option longopts[] = {
			{ "data", optional_argument, NULL, 'd'},
			{ "metadata", optional_argument, NULL, 'm' },
			{ "system", optional_argument, NULL, 's' },
			{ "force", no_argument, NULL, 'f' },
			{ "verbose", no_argument, NULL, 'v' },
			{ NULL, 0, NULL, 0 }
		};

		int opt = getopt_long(argc, argv, "d::s::m::fv", longopts, NULL);
		if (opt < 0)
			break;

		switch (opt) {
		case 'd':
			nofilters = 0;
			args.flags |= BTRFS_BALANCE_DATA;

			if (parse_filters(optarg, &args.data))
				return 1;
			break;
		case 's':
			nofilters = 0;
			args.flags |= BTRFS_BALANCE_SYSTEM;

			if (parse_filters(optarg, &args.sys))
				return 1;
			break;
		case 'm':
			nofilters = 0;
			args.flags |= BTRFS_BALANCE_METADATA;

			if (parse_filters(optarg, &args.meta))
				return 1;
			break;
		case 'f':
			force = 1;
			break;
		case 'v':
			verbose = 1;
			break;
		default:
			usage(cmd_balance_start_usage);
		}
	}

	if (check_argc_exact(argc - optind, 1))
		usage(cmd_balance_start_usage);

	/*
	 * allow -s only under --force, otherwise do with system chunks
	 * the same thing we were ordered to do with meta chunks
	 */
	if (args.flags & BTRFS_BALANCE_SYSTEM) {
		if (!force) {
			fprintf(stderr,
"Refusing to explicitly operate on system chunks.\n"
"Pass --force if you really want to do that.\n");
			return 1;
		}
	} else if (args.flags & BTRFS_BALANCE_METADATA) {
		args.flags |= BTRFS_BALANCE_SYSTEM;
		memcpy(&args.sys, &args.meta,
			sizeof(struct btrfs_balance_args));
	}

	if (nofilters) {
		/* relocate everything - no filters */
		args.flags |= BTRFS_BALANCE_TYPE_MASK;
	}

	/* drange makes sense only when devid is set */
	for (i = 0; ptrs[i]; i++) {
		if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
		    !(ptrs[i]->flags & BTRFS_BALANCE_ARGS_DEVID)) {
			fprintf(stderr, "drange filter can be used only if "
				"devid filter is used\n");
			return 1;
		}
	}

	/* soft makes sense only when convert for corresponding type is set */
	for (i = 0; ptrs[i]; i++) {
		if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_SOFT) &&
		    !(ptrs[i]->flags & BTRFS_BALANCE_ARGS_CONVERT)) {
			fprintf(stderr, "'soft' option can be used only if "
				"changing profiles\n");
			return 1;
		}
	}

	if (force)
		args.flags |= BTRFS_BALANCE_FORCE;
	if (verbose)
		dump_ioctl_balance_args(&args);

	return do_balance(argv[optind], &args, nofilters);
}

static const char * const cmd_balance_pause_usage[] = {
	"btrfs balance pause <path>",
	"Pause running balance",
	NULL
};

static int cmd_balance_pause(int argc, char **argv)
{
	const char *path;
	int fd;
	int ret;
	int e;
	DIR *dirstream = NULL;

	if (check_argc_exact(argc, 2))
		usage(cmd_balance_pause_usage);

	path = argv[1];

	fd = btrfs_open_dir(path, &dirstream, 1);
	if (fd < 0)
		return 1;

	ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_PAUSE);
	e = errno;
	close_file_or_dir(fd, dirstream);

	if (ret < 0) {
		fprintf(stderr, "ERROR: balance pause on '%s' failed - %s\n",
			path, (e == ENOTCONN) ? "Not running" : strerror(e));
		if (e == ENOTCONN)
			return 2;
		else
			return 1;
	}

	return 0;
}

static const char * const cmd_balance_cancel_usage[] = {
	"btrfs balance cancel <path>",
	"Cancel running or paused balance",
	NULL
};

static int cmd_balance_cancel(int argc, char **argv)
{
	const char *path;
	int fd;
	int ret;
	int e;
	DIR *dirstream = NULL;

	if (check_argc_exact(argc, 2))
		usage(cmd_balance_cancel_usage);

	path = argv[1];

	fd = btrfs_open_dir(path, &dirstream, 1);
	if (fd < 0)
		return 1;

	ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_CANCEL);
	e = errno;
	close_file_or_dir(fd, dirstream);

	if (ret < 0) {
		fprintf(stderr, "ERROR: balance cancel on '%s' failed - %s\n",
			path, (e == ENOTCONN) ? "Not in progress" : strerror(e));
		if (e == ENOTCONN)
			return 2;
		else
			return 1;
	}

	return 0;
}

static const char * const cmd_balance_resume_usage[] = {
	"btrfs balance resume <path>",
	"Resume interrupted balance",
	NULL
};

static int cmd_balance_resume(int argc, char **argv)
{
	struct btrfs_ioctl_balance_args args;
	const char *path;
	DIR *dirstream = NULL;
	int fd;
	int ret;
	int e;

	if (check_argc_exact(argc, 2))
		usage(cmd_balance_resume_usage);

	path = argv[1];

	fd = btrfs_open_dir(path, &dirstream, 1);
	if (fd < 0)
		return 1;

	memset(&args, 0, sizeof(args));
	args.flags |= BTRFS_BALANCE_RESUME;

	ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, &args);
	e = errno;
	close_file_or_dir(fd, dirstream);

	if (ret < 0) {
		if (e == ECANCELED) {
			if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
				fprintf(stderr, "balance paused by user\n");
			if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
				fprintf(stderr, "balance canceled by user\n");
		} else if (e == ENOTCONN || e == EINPROGRESS) {
			fprintf(stderr, "ERROR: balance resume on '%s' "
				"failed - %s\n", path,
				(e == ENOTCONN) ? "Not in progress" :
						  "Already running");
			if (e == ENOTCONN)
				return 2;
			else
				return 1;
		} else {
			fprintf(stderr,
"ERROR: error during balancing '%s' - %s\n"
"There may be more info in syslog - try dmesg | tail\n", path, strerror(e));
			return 1;
		}
	} else {
		printf("Done, had to relocate %llu out of %llu chunks\n",
		       (unsigned long long)args.stat.completed,
		       (unsigned long long)args.stat.considered);
	}

	return 0;
}

static const char * const cmd_balance_status_usage[] = {
	"btrfs balance status [-v] <path>",
	"Show status of running or paused balance",
	"",
	"-v     be verbose",
	NULL
};

/* Checks the status of the balance if any
 * return codes:
 *   2 : Error failed to know if there is any pending balance
 *   1 : Successful to know status of a pending balance
 *   0 : When there is no pending balance or completed
 */
static int cmd_balance_status(int argc, char **argv)
{
	struct btrfs_ioctl_balance_args args;
	const char *path;
	DIR *dirstream = NULL;
	int fd;
	int verbose = 0;
	int ret;
	int e;

	optind = 1;
	while (1) {
		int opt;
		static const struct option longopts[] = {
			{ "verbose", no_argument, NULL, 'v' },
			{ NULL, 0, NULL, 0 }
		};

		opt = getopt_long(argc, argv, "v", longopts, NULL);
		if (opt < 0)
			break;

		switch (opt) {
		case 'v':
			verbose = 1;
			break;
		default:
			usage(cmd_balance_status_usage);
		}
	}

	if (check_argc_exact(argc - optind, 1))
		usage(cmd_balance_status_usage);

	path = argv[optind];

	fd = btrfs_open_dir(path, &dirstream, 1);
	if (fd < 0)
		return 2;

	ret = ioctl(fd, BTRFS_IOC_BALANCE_PROGRESS, &args);
	e = errno;
	close_file_or_dir(fd, dirstream);

	if (ret < 0) {
		if (e == ENOTCONN) {
			printf("No balance found on '%s'\n", path);
			return 0;
		}
		fprintf(stderr, "ERROR: balance status on '%s' failed - %s\n",
			path, strerror(e));
		return 2;
	}

	if (args.state & BTRFS_BALANCE_STATE_RUNNING) {
		printf("Balance on '%s' is running", path);
		if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
			printf(", cancel requested\n");
		else if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
			printf(", pause requested\n");
		else
			printf("\n");
	} else {
		printf("Balance on '%s' is paused\n", path);
	}

	printf("%llu out of about %llu chunks balanced (%llu considered), "
	       "%3.f%% left\n", (unsigned long long)args.stat.completed,
	       (unsigned long long)args.stat.expected,
	       (unsigned long long)args.stat.considered,
	       100 * (1 - (float)args.stat.completed/args.stat.expected));

	if (verbose)
		dump_ioctl_balance_args(&args);

	return 1;
}

static const char balance_cmd_group_info[] =
"balance data accross devices, or change block groups using filters";

const struct cmd_group balance_cmd_group = {
	balance_cmd_group_usage, balance_cmd_group_info, {
		{ "start", cmd_balance_start, cmd_balance_start_usage, NULL, 0 },
		{ "pause", cmd_balance_pause, cmd_balance_pause_usage, NULL, 0 },
		{ "cancel", cmd_balance_cancel, cmd_balance_cancel_usage, NULL, 0 },
		{ "resume", cmd_balance_resume, cmd_balance_resume_usage, NULL, 0 },
		{ "status", cmd_balance_status, cmd_balance_status_usage, NULL, 0 },
		NULL_CMD_STRUCT
	}
};

int cmd_balance(int argc, char **argv)
{
	if (argc == 2) {
		/* old 'btrfs filesystem balance <path>' syntax */
		struct btrfs_ioctl_balance_args args;

		memset(&args, 0, sizeof(args));
		args.flags |= BTRFS_BALANCE_TYPE_MASK;

		return do_balance(argv[1], &args, 1);
	}

	return handle_command_group(&balance_cmd_group, argc, argv);
}