summaryrefslogtreecommitdiff
path: root/cmds-qgroup.c
blob: 95aca9b8eae92ef73066fb273550fcff435e30cf (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
/*
 * Copyright (C) 2012 STRATO.  All rights reserved.
 *
 * 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 <sys/ioctl.h>
#include <unistd.h>
#include <getopt.h>

#include "ctree.h"
#include "ioctl.h"

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

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

static int qgroup_assign(int assign, int argc, char **argv)
{
	int ret = 0;
	int fd;
	int e;
	char *path = argv[3];
	struct btrfs_ioctl_qgroup_assign_args args;

	if (check_argc_exact(argc, 4))
		return -1;

	memset(&args, 0, sizeof(args));
	args.assign = assign;
	args.src = parse_qgroupid(argv[1]);
	args.dst = parse_qgroupid(argv[2]);

	/*
	 * FIXME src should accept subvol path
	 */
	if ((args.src >> 48) >= (args.dst >> 48)) {
		fprintf(stderr, "ERROR: bad relation requested '%s'\n", path);
		return 12;
	}
	fd = open_file_or_dir(path);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access '%s'\n", path);
		return 12;
	}

	ret = ioctl(fd, BTRFS_IOC_QGROUP_ASSIGN, &args);
	e = errno;
	close(fd);
	if (ret < 0) {
		fprintf(stderr, "ERROR: unable to assign quota group: %s\n",
			strerror(e));
		return 30;
	}
	return 0;
}

static int qgroup_create(int create, int argc, char **argv)
{
	int ret = 0;
	int fd;
	int e;
	char *path = argv[2];
	struct btrfs_ioctl_qgroup_create_args args;

	if (check_argc_exact(argc, 3))
		return -1;

	memset(&args, 0, sizeof(args));
	args.create = create;
	args.qgroupid = parse_qgroupid(argv[1]);

	fd = open_file_or_dir(path);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access '%s'\n", path);
		return 12;
	}

	ret = ioctl(fd, BTRFS_IOC_QGROUP_CREATE, &args);
	e = errno;
	close(fd);
	if (ret < 0) {
		fprintf(stderr, "ERROR: unable to create quota group: %s\n",
			strerror(e));
		return 30;
	}
	return 0;
}

void print_qgroup_info(u64 objectid, struct btrfs_qgroup_info_item *info)
{
	printf("%llu/%llu %lld %lld\n", objectid >> 48,
		objectid & ((1ll << 48) - 1),
		btrfs_stack_qgroup_info_referenced(info),
		btrfs_stack_qgroup_info_exclusive(info));
}

int list_qgroups(int fd)
{
	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;
	unsigned int i;
	struct btrfs_qgroup_info_item *info;

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

	/* search in the quota tree */
	sk->tree_id = BTRFS_QUOTA_TREE_OBJECTID;

	/*
	 * set the min and max to backref keys.  The search will
	 * only send back this type of key now.
	 */
	sk->max_type = BTRFS_QGROUP_INFO_KEY;
	sk->min_type = BTRFS_QGROUP_INFO_KEY;
	sk->max_objectid = 0;
	sk->max_offset = (u64)-1;
	sk->max_transid = (u64)-1;

	/* just a big number, doesn't matter much */
	sk->nr_items = 4096;

	while (1) {
		ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
		if (ret < 0)
			return ret;

		/* the ioctl returns the number of item it found in nr_items */
		if (sk->nr_items == 0)
			break;

		off = 0;

		/*
		 * for each item, pull the key out of the header and then
		 * read the root_ref item it contains
		 */
		for (i = 0; i < sk->nr_items; i++) {
			sh = (struct btrfs_ioctl_search_header *)(args.buf +
								  off);
			off += sizeof(*sh);

			if (sh->objectid != 0)
				goto done;

			if (sh->type != BTRFS_QGROUP_INFO_KEY)
				goto done;

			info = (struct btrfs_qgroup_info_item *)
					(args.buf + off);
			print_qgroup_info(sh->offset, info);

			off += sh->len;

			/*
			 * record the mins in sk so we can make sure the
			 * next search doesn't repeat this root
			 */
			sk->min_offset = sh->offset;
		}
		sk->nr_items = 4096;
		/*
		 * this iteration is done, step forward one qgroup for the next
		 * ioctl
		 */
		if (sk->min_offset < (u64)-1)
			sk->min_offset++;
		else
			break;
	}

done:
	return ret;
}

static int parse_limit(const char *p, unsigned long long *s)
{
	char *endptr;
	unsigned long long size;

	if (strcasecmp(p, "none") == 0) {
		*s = 0;
		return 1;
	}
	size = strtoull(p, &endptr, 10);
	switch (*endptr) {
	case 'T':
	case 't':
		size *= 1024;
	case 'G':
	case 'g':
		size *= 1024;
	case 'M':
	case 'm':
		size *= 1024;
	case 'K':
	case 'k':
		size *= 1024;
		++endptr;
		break;
	case 0:
		break;
	default:
		return 0;
	}

	if (*endptr)
		return 0;

	*s = size;

	return 1;
}

static const char * const cmd_qgroup_assign_usage[] = {
	"btrfs qgroup assign <src> <dst> <path>",
	"Enable subvolume qgroup support for a filesystem.",
	NULL
};

static int cmd_qgroup_assign(int argc, char **argv)
{
	int ret = qgroup_assign(1, argc, argv);
	if (ret < 0)
		usage(cmd_qgroup_assign_usage);
	return ret;
}

static const char * const cmd_qgroup_remove_usage[] = {
	"btrfs qgroup remove <src> <dst> <path>",
	"Remove a subvol from a quota group.",
	NULL
};

static int cmd_qgroup_remove(int argc, char **argv)
{
	int ret = qgroup_assign(0, argc, argv);
	if (ret < 0)
		usage(cmd_qgroup_remove_usage);
	return ret;
}

static const char * const cmd_qgroup_create_usage[] = {
	"btrfs qgroup create <qgroupid> <path>",
	"Create a subvolume quota group.",
	NULL
};

static int cmd_qgroup_create(int argc, char **argv)
{
	int ret = qgroup_create(1, argc, argv);
	if (ret < 0)
		usage(cmd_qgroup_create_usage);
	return ret;
}

static const char * const cmd_qgroup_destroy_usage[] = {
	"btrfs qgroup destroy <qgroupid> <path>",
	"Destroy a subvolume quota group.",
	NULL
};

static int cmd_qgroup_destroy(int argc, char **argv)
{
	int ret = qgroup_create(0, argc, argv);
	if (ret < 0)
		usage(cmd_qgroup_destroy_usage);
	return ret;
}

static const char * const cmd_qgroup_show_usage[] = {
	"btrfs qgroup show <path>",
	"Show all subvolume quota groups.",
	NULL
};

static int cmd_qgroup_show(int argc, char **argv)
{
	int ret = 0;
	int fd;
	int e;
	char *path = argv[1];

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

	fd = open_file_or_dir(path);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access '%s'\n", path);
		return 12;
	}

	ret = list_qgroups(fd);
	e = errno;
	close(fd);
	if (ret < 0) {
		fprintf(stderr, "ERROR: can't list qgroups: %s\n",
				strerror(e));
		return 30;
	}

	return ret;
}

static const char * const cmd_qgroup_limit_usage[] = {
	"btrfs qgroup limit [options] <size>|none [<qgroupid>] <path>",
	"Limit the size of a subvolume quota group.",
	"",
	"-c   limit amount of data after compression. This is the default,",
	"     it is currently not possible to turn off this option.",
	"-e   limit space exclusively assigned to this qgroup",
	NULL
};

static int cmd_qgroup_limit(int argc, char **argv)
{
	int ret = 0;
	int fd;
	int e;
	char *path = NULL;
	struct btrfs_ioctl_qgroup_limit_args args;
	unsigned long long size;
	int compressed = 0;
	int exclusive = 0;

	optind = 1;
	while (1) {
		int c = getopt(argc, argv, "ce");
		if (c < 0)
			break;
		switch (c) {
		case 'c':
			compressed = 1;
			break;
		case 'e':
			exclusive = 1;
			break;
		default:
			usage(cmd_qgroup_limit_usage);
		}
	}

	if (check_argc_min(argc - optind, 2))
		usage(cmd_qgroup_limit_usage);

	if (!parse_limit(argv[optind], &size)) {
		fprintf(stderr, "Invalid size argument given\n");
		return 1;
	}

	memset(&args, 0, sizeof(args));
	if (size) {
		if (compressed)
			args.lim.flags |= BTRFS_QGROUP_LIMIT_RFER_CMPR |
					  BTRFS_QGROUP_LIMIT_EXCL_CMPR;
		if (exclusive) {
			args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_EXCL;
			args.lim.max_exclusive = size;
		} else {
			args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_RFER;
			args.lim.max_referenced = size;
		}
	}

	if (argc - optind == 2) {
		args.qgroupid = 0;
		path = argv[optind + 1];
		ret = test_issubvolume(path);
		if (ret < 0) {
			fprintf(stderr, "ERROR: error accessing '%s'\n", path);
			return 12;
		}
		if (!ret) {
			fprintf(stderr, "ERROR: '%s' is not a subvolume\n",
				path);
			return 13;
		}
		/*
		 * keep qgroupid at 0, this indicates that the subvolume the
		 * fd refers to is to be limited
		 */
	} else if (argc - optind == 3) {
		args.qgroupid = parse_qgroupid(argv[optind + 1]);
		path = argv[optind + 2];
	} else
		usage(cmd_qgroup_limit_usage);

	fd = open_file_or_dir(path);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access '%s'\n", path);
		return 12;
	}

	ret = ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args);
	e = errno;
	close(fd);
	if (ret < 0) {
		fprintf(stderr, "ERROR: unable to limit requested quota group: "
			"%s\n", strerror(e));
		return 30;
	}
	return 0;
}

const struct cmd_group qgroup_cmd_group = {
	qgroup_cmd_group_usage, NULL, {
		{ "assign", cmd_qgroup_assign, cmd_qgroup_assign_usage, 0, 0 },
		{ "remove", cmd_qgroup_remove, cmd_qgroup_remove_usage, 0, 0 },
		{ "create", cmd_qgroup_create, cmd_qgroup_create_usage, 0, 0 },
		{ "destroy", cmd_qgroup_destroy,
		  cmd_qgroup_destroy_usage, 0, 0 },
		{ "show", cmd_qgroup_show, cmd_qgroup_show_usage, 0, 0 },
		{ "limit", cmd_qgroup_limit, cmd_qgroup_limit_usage, 0, 0 },
		{ 0, 0, 0, 0, 0 }
	}
};

int cmd_qgroup(int argc, char **argv)
{
	return handle_command_group(&qgroup_cmd_group, argc, argv);
}