summaryrefslogtreecommitdiff
path: root/bcacheadm-format.c
blob: e2bc42516b4187ecb29ed0bd7c80894fc57f51f8 (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
/*
 * Authors: Kent Overstreet <kmo@daterainc.com>
 *	    Gabriel de Perthuis <g2p.code@gmail.com>
 *	    Jacob Malevich <jam@datera.io>
 *
 * GPLv2
 */

#if 0
#include <nih/main.h>
#include <nih/logging.h>
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#include <blkid.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <dirent.h>
#endif

#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

#include <uuid/uuid.h>

#include <nih/command.h>
#include <nih/option.h>

#include "bcache.h"
#include "bcacheadm.h"

static struct cache_opts {
	int		fd;
	const char	*dev;
	unsigned	bucket_size;
	unsigned	tier;
	unsigned	replacement_policy;
	unsigned	replication_set;
	uint64_t	filesystem_size;
} cache_devices[MAX_DEVS];

static struct backingdev_opts {
	int		fd;
	const char	*dev;
	const char	*label;
} backing_devices[MAX_DEVS];

static size_t nr_backing_devices = 0, nr_cache_devices = 0;

static char *label = NULL;

/* All in units of 512 byte sectors */
static unsigned block_size;
static unsigned bucket_size = 2048;
static unsigned btree_node_size;
static uint64_t filesystem_size;
static unsigned tier, replacement_policy;

static uuid_t cache_set_uuid;
static unsigned csum_type = BCH_CSUM_CRC32C;
static unsigned replication_set, meta_replicas = 1, data_replicas = 1;
static unsigned on_error_action;
static int discard;

static uint64_t data_offset = BDEV_DATA_START_DEFAULT;
static unsigned cache_mode = CACHE_MODE_WRITEBACK;

static int set_cache(NihOption *option, const char *arg)
{
	cache_devices[nr_cache_devices++] = (struct cache_opts) {
		.dev			= strdup(arg),
		.bucket_size		= bucket_size,
		.tier			= tier,
		.replacement_policy	= replacement_policy,
		.replication_set	= replication_set,
		.filesystem_size	= filesystem_size,
	};
	return 0;
}

static int set_bdev(NihOption *option, const char *arg)
{
	backing_devices[nr_backing_devices++] = (struct backingdev_opts) {
		.dev			= strdup(arg),
		.label			= strdup(label),
	};
	return 0;
}

static int set_cache_set_uuid(NihOption *option, const char *arg)
{
	if (uuid_parse(arg, cache_set_uuid))
		die("Bad uuid");
	return 0;
}

static int set_block_size(NihOption *option, const char *arg)
{
	block_size = hatoi_validate(arg, "block size");
	return 0;
}

static int set_bucket_sizes(NihOption *option, const char *arg)
{
	bucket_size = hatoi_validate(arg, "bucket size");
	return 0;
}

static int set_btree_node_size(NihOption *option, const char *arg)
{
	btree_node_size = hatoi_validate(arg, "btree node size");
	return 0;
}

static int set_filesystem_size(NihOption *option, const char *arg)
{
	filesystem_size = hatoi(arg) >> 9;
	return 0;
}

static int set_replacement_policy(NihOption *option, const char *arg)
{
	replacement_policy = read_string_list_or_die(arg, replacement_policies,
						     "replacement policy");
	return 0;
}

static int set_csum_type(NihOption *option, const char *arg)
{
	csum_type = read_string_list_or_die(arg, csum_types, "checksum type");
	return 0;
}

static int set_on_error_action(NihOption *option, const char *arg)
{
	on_error_action = read_string_list_or_die(arg, error_actions,
						  "error action");
	return 0;
}

static int set_tier(NihOption *option, const char *arg)
{
	tier = strtoul_or_die(arg, CACHE_TIERS, "tier");
	return 0;
}

static int set_replication_set(NihOption *option, const char *arg)
{
	replication_set = strtoul_or_die(arg, CACHE_REPLICATION_SET_MAX,
					 "replication set");
	return 0;
}

static int set_meta_replicas(NihOption *option, const char *arg)
{
	meta_replicas = strtoul_or_die(arg, CACHE_SET_META_REPLICAS_WANT_MAX,
				       "meta_replicas");
	return 0;
}

static int set_data_replicas(NihOption *option, const char *arg)
{
	data_replicas = strtoul_or_die(arg, CACHE_SET_DATA_REPLICAS_WANT_MAX,
				       "data_replicas");
	return 0;
}

static int set_cache_mode(NihOption *option, const char *arg)
{
	cache_mode = read_string_list_or_die(arg, bdev_cache_mode,
					     "cache mode");
	return 0;
}

NihOption bcacheadm_format_options[] = {
//	{ int shortoption, char *longoption, char *help, NihOptionGroup, char *argname, void *value, NihOptionSetter}

	{ 'C',	"cache",		N_("Format a cache device"),
		NULL, "dev",	NULL,	set_cache },
	{ 'B',	"bdev",			N_("Format a backing device"),
		NULL, "dev",	NULL,	set_bdev },

	{ 'l',	"label",		N_("label"),
		NULL, "label",	&label, NULL},
	{ 0,	"cset_uuid",		N_("UUID for the cache set"),
		NULL, "uuid",	NULL,	set_cache_set_uuid },

	{ 'w',	"block",		N_("block size (hard sector size of SSD, often 2k"),
		NULL, "size",	NULL,	set_block_size },
	{ 'b',	"bucket",		N_("bucket size"),
		NULL, "size",	NULL,	set_bucket_sizes },
	{ 'n',	"btree-node",		N_("Btree node size, default 256k"),
		NULL, "size",	NULL,	set_btree_node_size },
	{ 0,	"fs-size",		N_("Size of filesystem on device" ),
		NULL, "size",	NULL,	set_filesystem_size },

	{ 'p',	"cache_replacement_policy", NULL,
		NULL, "(lru|fifo|random)", NULL, set_replacement_policy },

	{ 0,	"csum-type",		N_("Checksum type"),
		NULL, "(none|crc32c|crc64)", NULL, set_csum_type },

	{ 0,	"on-error",		N_("Action to take on filesystem error"),
		NULL, "(continue|readonly|panic)", NULL, set_on_error_action },

	{ 0,	"discard",		N_("Enable discards"),
		NULL, NULL,	&discard,		NULL },

	{ 't',	"tier",			N_("tier of subsequent devices"),
		NULL, "#",	NULL,	set_tier },

	{ 0,	"replication_set",	N_("replication set of subsequent devices"),
		NULL, "#",	NULL,	set_replication_set },

	{ 0,	"meta-replicas",	N_("number of metadata replicas"),
		NULL, "#",	NULL,	set_meta_replicas },

	{ 0,	"data-replicas",	N_("number of data replicas"),
		NULL, "#",	NULL,	set_data_replicas },

	{ 0,	"cache_mode",		N_("Cache mode (for backing devices)"),
		NULL, "(writethrough|writeback|writearound", NULL, set_cache_mode },

	{ 'o',	"data_offset",		N_("data offset in sectors"),
		NULL, "offset",	&data_offset, NULL},

	NIH_OPTION_LAST
};

int bcacheadm_format(NihCommand *command, char *const *args)
{
	struct cache_sb *cache_set_sb;

	if (!nr_cache_devices && !nr_backing_devices)
		die("Please supply a device");

	for (struct cache_opts *i = cache_devices;
	     i < cache_devices + nr_cache_devices;
	     i++)
		i->fd = dev_open(i->dev);

	for (struct backingdev_opts *i = backing_devices;
	     i < backing_devices + nr_backing_devices;
	     i++)
		i->fd = dev_open(i->dev);

	if (!block_size) {
		for (struct cache_opts *i = cache_devices;
		     i < cache_devices + nr_cache_devices;
		     i++)
			block_size = max(block_size, get_blocksize(i->dev, i->fd));

		for (struct backingdev_opts *i = backing_devices;
		     i < backing_devices + nr_backing_devices;
		     i++)
			block_size = max(block_size, get_blocksize(i->dev, i->fd));
	}

	if (!btree_node_size) {
		btree_node_size = 512;

		for (struct cache_opts *i = cache_devices;
		     i < cache_devices + nr_cache_devices;
		     i++)
			btree_node_size = min(btree_node_size, i->bucket_size);
	}

	cache_set_sb = calloc(1, sizeof(*cache_set_sb) +
			      sizeof(struct cache_member) * nr_cache_devices);

	cache_set_sb->offset		= SB_SECTOR;
	cache_set_sb->version		= BCACHE_SB_VERSION_CDEV_V3;
	cache_set_sb->magic		= BCACHE_MAGIC;
	cache_set_sb->block_size	= block_size;
	uuid_generate(cache_set_sb->set_uuid.b);

	if (uuid_is_null(cache_set_uuid))
		uuid_generate(cache_set_sb->user_uuid.b);
	else
		memcpy(cache_set_sb->user_uuid.b, cache_set_uuid,
		       sizeof(cache_set_sb->user_uuid));

	if (label)
		memcpy(cache_set_sb->label, label, sizeof(cache_set_sb->label));

	/*
	 * don't have a userspace crc32c implementation handy, just always use
	 * crc64
	 */
	SET_CACHE_SB_CSUM_TYPE(cache_set_sb,		BCH_CSUM_CRC64);
	SET_CACHE_PREFERRED_CSUM_TYPE(cache_set_sb,	csum_type);

	SET_CACHE_BTREE_NODE_SIZE(cache_set_sb,		btree_node_size);
	SET_CACHE_SET_META_REPLICAS_WANT(cache_set_sb,	meta_replicas);
	SET_CACHE_SET_META_REPLICAS_HAVE(cache_set_sb,	meta_replicas);
	SET_CACHE_SET_DATA_REPLICAS_WANT(cache_set_sb,	data_replicas);
	SET_CACHE_SET_DATA_REPLICAS_HAVE(cache_set_sb,	data_replicas);
	SET_CACHE_ERROR_ACTION(cache_set_sb,		on_error_action);

	for (struct cache_opts *i = cache_devices;
	     i < cache_devices + nr_cache_devices;
	     i++) {
		if (i->bucket_size < block_size)
			die("Bucket size cannot be smaller than block size");

		struct cache_member *m = cache_set_sb->members + cache_set_sb->nr_in_set++;

		uuid_generate(m->uuid.b);
		m->nbuckets	= (i->filesystem_size ?:
				   getblocks(i->fd)) / i->bucket_size;
		m->first_bucket	= (23 / i->bucket_size) + 3;
		m->bucket_size	= i->bucket_size;

		if (m->nbuckets < 1 << 7)
			die("Not enough buckets: %llu, need %u",
			    m->nbuckets, 1 << 7);

		SET_CACHE_TIER(m,		i->tier);
		SET_CACHE_REPLICATION_SET(m,	i->replication_set);
		SET_CACHE_REPLACEMENT(m,	i->replacement_policy);
		SET_CACHE_DISCARD(m,		discard);
	}

	cache_set_sb->u64s = bch_journal_buckets_offset(cache_set_sb);

	for (unsigned i = 0; i < cache_set_sb->nr_in_set; i++) {
		char uuid_str[40], set_uuid_str[40];
		struct cache_member *m = cache_set_sb->members + i;

		cache_set_sb->disk_uuid		= m->uuid;
		cache_set_sb->nr_this_dev	= i;
		cache_set_sb->csum		= csum_set(cache_set_sb,
						CACHE_SB_CSUM_TYPE(cache_set_sb));

		uuid_unparse(cache_set_sb->disk_uuid.b, uuid_str);
		uuid_unparse(cache_set_sb->user_uuid.b, set_uuid_str);
		printf("UUID:			%s\n"
		       "Set UUID:		%s\n"
		       "version:		%u\n"
		       "nbuckets:		%llu\n"
		       "block_size:		%u\n"
		       "bucket_size:		%u\n"
		       "nr_in_set:		%u\n"
		       "nr_this_dev:		%u\n"
		       "first_bucket:		%u\n",
		       uuid_str, set_uuid_str,
		       (unsigned) cache_set_sb->version,
		       m->nbuckets,
		       cache_set_sb->block_size,
		       m->bucket_size,
		       cache_set_sb->nr_in_set,
		       cache_set_sb->nr_this_dev,
		       m->first_bucket);

		do_write_sb(cache_devices[i].fd, cache_set_sb);
	}

	for (struct backingdev_opts *i = backing_devices;
	     i < backing_devices + nr_backing_devices;
	     i++)
		write_backingdev_sb(i->fd, block_size, cache_mode,
				    data_offset, i->label,
				    cache_set_sb->user_uuid,
				    cache_set_sb->set_uuid);


	return 0;
}