summaryrefslogtreecommitdiffstats
path: root/xlators/cluster/dht/src/dht-layout.c
blob: a45625876bd4cb43942095a032592bdba5603b7b (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
/*
   Copyright (c) 2008-2009 Z RESEARCH, Inc. <http://www.zresearch.com>
   This file is part of GlusterFS.

   GlusterFS 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 3 of the License,
   or (at your option) any later version.

   GlusterFS 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, see
   <http://www.gnu.org/licenses/>.
*/

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif


#include "glusterfs.h"
#include "xlator.h"
#include "dht-common.h"
#include "byte-order.h"

#define layout_base_size (sizeof (dht_layout_t))

#define layout_entry_size (sizeof ((dht_layout_t *)NULL)->list[0])

#define layout_size(cnt) (layout_base_size + (cnt * layout_entry_size))


dht_layout_t *
dht_layout_new (xlator_t *this, int cnt)
{
	dht_layout_t *layout = NULL;


	layout = CALLOC (1, layout_size (cnt));
	if (!layout) {
		gf_log (this->name, GF_LOG_ERROR,
			"memory allocation failed :(");
		goto out;
	}

	layout->cnt = cnt;

out:
	return layout;
}


dht_layout_t *
dht_layout_get (xlator_t *this, inode_t *inode)
{
        uint64_t layout = 0;
        int      ret    = -1;

        ret = inode_ctx_get (inode, this, &layout);

        return (dht_layout_t *)(long)layout;
}


xlator_t *
dht_layout_search (xlator_t *this, dht_layout_t *layout, const char *name)
{
	uint32_t   hash = 0;
        xlator_t  *subvol = NULL;
	int        i = 0;
	int        ret = 0;


	ret = dht_hash_compute (layout->type, name, &hash);
	if (ret != 0) {
		gf_log (this->name, GF_LOG_ERROR,
			"hash computation failed for type=%d name=%s",
			layout->type, name);
		goto out;
	}

	for (i = 0; i < layout->cnt; i++) {
		if (layout->list[i].start <= hash
		    && layout->list[i].stop >= hash) {
			subvol = layout->list[i].xlator;
			break;
		}
	}

	if (!subvol) {
		gf_log (this->name, GF_LOG_DEBUG,
			"no subvolume for hash (value) = %u", hash);
	}

out:
	return subvol;
}


dht_layout_t *
dht_layout_for_subvol (xlator_t *this, xlator_t *subvol)
{
	dht_conf_t   *conf = NULL;
	dht_layout_t *layout = NULL;
	int           i = 0;


	conf = this->private;

	for (i = 0; i < conf->subvolume_cnt; i++) {
		if (conf->subvolumes[i] == subvol) {
			layout = conf->file_layouts[i];
			break;
		}
	}

	return layout;
}


int
dht_layouts_init (xlator_t *this, dht_conf_t *conf)
{
	dht_layout_t *layout = NULL;
	int           i = 0;
	int           ret = -1;
	

	conf->file_layouts = CALLOC (conf->subvolume_cnt,
				     sizeof (dht_layout_t *));
	if (!conf->file_layouts) {
		gf_log (this->name, GF_LOG_ERROR,
			"memory allocation failed :(");
		goto out;
	}

	for (i = 0; i < conf->subvolume_cnt; i++) {
		layout = dht_layout_new (this, 1);

		if (!layout) {
			goto out;
		}

		layout->preset = 1;

		layout->list[0].xlator = conf->subvolumes[i];

		conf->file_layouts[i] = layout;
	}

	ret = 0;
out:
	return ret;
}


int
dht_disk_layout_extract (xlator_t *this, dht_layout_t *layout,
			 int pos, int32_t **disk_layout_p)
{
	int      ret = -1;
	int32_t *disk_layout = NULL;

	disk_layout = CALLOC (5, sizeof (int));
	if (!disk_layout) {
		gf_log (this->name, GF_LOG_ERROR,
			"memory allocation failed :(");
		goto out;
	}

	disk_layout[0] = hton32 (1);
	disk_layout[1] = hton32 (layout->type);
	disk_layout[2] = hton32 (layout->list[pos].start);
	disk_layout[3] = hton32 (layout->list[pos].stop);

	if (disk_layout_p)
		*disk_layout_p = disk_layout;
	ret = 0;

out:
	return ret;
}


int
dht_disk_layout_merge (xlator_t *this, dht_layout_t *layout,
		       int pos, int32_t *disk_layout)
{
	int      cnt = 0;
	int      type = 0;
	int      start_off = 0;
	int      stop_off = 0;

	/* TODO: assert disk_layout_ptr is of required length */

	cnt  = ntoh32 (disk_layout[0]);
	if (cnt != 1) {
		gf_log (this->name, GF_LOG_ERROR,
			"disk layout has invalid count %d", cnt);
		return -1;
	}

	/* TODO: assert type is compatible */
	type      = ntoh32 (disk_layout[1]);
	start_off = ntoh32 (disk_layout[2]);
	stop_off  = ntoh32 (disk_layout[3]);

	layout->list[pos].start = start_off;
	layout->list[pos].stop  = stop_off;

	gf_log (this->name, GF_LOG_DEBUG,
		"merged to layout: %u - %u (type %d) from %s",
		start_off, stop_off, type,
		layout->list[pos].xlator->name);

	return 0;
}


int
dht_layout_merge (xlator_t *this, dht_layout_t *layout, xlator_t *subvol,
		  int op_ret, int op_errno, dict_t *xattr)
{
	int      i     = 0;
	int      ret   = -1;
	int      err   = -1;
	int32_t *disk_layout = NULL;


	if (op_ret != 0) {
		err = op_errno;
	}

	for (i = 0; i < layout->cnt; i++) {
		if (layout->list[i].xlator == NULL) {
			layout->list[i].err    = err;
			layout->list[i].xlator = subvol;
			break;
		}
	}

	if (op_ret != 0) {
		ret = 0;
		goto out;
	}

	if (xattr) {
		/* during lookup and not mkdir */
		ret = dict_get_ptr (xattr, "trusted.glusterfs.dht",
				    VOID(&disk_layout));
	}

	if (ret != 0) {
		layout->list[i].err = -1;
		gf_log (this->name, GF_LOG_DEBUG,
			"missing disk layout on %s. err = %d",
			subvol->name, err);
		ret = 0;
		goto out;
	}

	ret = dht_disk_layout_merge (this, layout, i, disk_layout);
	if (ret != 0) {
		gf_log (this->name, GF_LOG_ERROR,
			"layout merge from subvolume %s failed",
			subvol->name);
		goto out;
	}
	layout->list[i].err = 0;

out:
	return ret;
}


void
dht_layout_entry_swap (dht_layout_t *layout, int i, int j)
{
	uint32_t  start_swap = 0;
	uint32_t  stop_swap = 0;
	xlator_t *xlator_swap = 0;
	int       err_swap = 0;


	start_swap  = layout->list[i].start;
	stop_swap   = layout->list[i].stop;
	xlator_swap = layout->list[i].xlator;
	err_swap    = layout->list[i].err;

	layout->list[i].start  = layout->list[j].start;
	layout->list[i].stop   = layout->list[j].stop;
	layout->list[i].xlator = layout->list[j].xlator;
	layout->list[i].err    = layout->list[j].err;

	layout->list[j].start  = start_swap;
	layout->list[j].stop   = stop_swap;
	layout->list[j].xlator = xlator_swap;
	layout->list[j].err    = err_swap;
}

int64_t
dht_layout_entry_cmp_volname (dht_layout_t *layout, int i, int j)
{
	return (strcmp (layout->list[i].xlator->name, 
			layout->list[j].xlator->name));
}

int64_t
dht_layout_entry_cmp (dht_layout_t *layout, int i, int j)
{
	int64_t diff = 0;

	if (layout->list[i].err || layout->list[j].err)
		diff = layout->list[i].err - layout->list[j].err;
	else
		diff = (int64_t) layout->list[i].start
			- (int64_t) layout->list[j].start;

	return diff;
}


int
dht_layout_sort (dht_layout_t *layout)
{
	int       i = 0;
	int       j = 0;
	int64_t   ret = 0;

	/* TODO: O(n^2) -- bad bad */

	for (i = 0; i < layout->cnt - 1; i++) {
		for (j = i + 1; j < layout->cnt; j++) {
			ret = dht_layout_entry_cmp (layout, i, j);
			if (ret > 0)
				dht_layout_entry_swap (layout, i, j);
		}
	}

	return 0;
}

int
dht_layout_sort_volname (dht_layout_t *layout)
{
	int       i = 0;
	int       j = 0;
	int64_t   ret = 0;

	/* TODO: O(n^2) -- bad bad */

	for (i = 0; i < layout->cnt - 1; i++) {
		for (j = i + 1; j < layout->cnt; j++) {
			ret = dht_layout_entry_cmp_volname (layout, i, j);
			if (ret > 0)
				dht_layout_entry_swap (layout, i, j);
		}
	}

	return 0;
}


int
dht_layout_anomalies (xlator_t *this, loc_t *loc, dht_layout_t *layout,
		      uint32_t *holes_p, uint32_t *overlaps_p,
		      uint32_t *missing_p, uint32_t *down_p, uint32_t *misc_p)
{
	dht_conf_t *conf = NULL;
	uint32_t    holes    = 0;
	uint32_t    overlaps = 0;
	uint32_t    missing  = 0;
	uint32_t    down     = 0;
	uint32_t    misc     = 0;
	uint32_t    hole_cnt = 0;
	uint32_t    overlap_cnt = 0;
	int         i = 0;
	int         ret = 0;
	uint32_t    prev_stop = 0;
	uint32_t    last_stop = 0;
	char        is_virgin = 1;


	conf = this->private;

	/* TODO: explain WTF is happening */

	last_stop = layout->list[0].start - 1;
	prev_stop = last_stop;

	for (i = 0; i < layout->cnt; i++) {
		if (layout->list[i].err) {
			switch (layout->list[i].err) {
			case -1:
			case ENOENT:
				missing++;
				break;
			case ENOTCONN:
				down++;
				break;
			default:
				misc++;
			}
			continue;
		}

		is_virgin = 0;

		if ((prev_stop + 1) < layout->list[i].start) {
			hole_cnt++;
			holes += (layout->list[i].start - (prev_stop + 1));
		}

		if ((prev_stop + 1) > layout->list[i].start) {
			overlap_cnt++;
			overlaps += ((prev_stop + 1) - layout->list[i].start);
		}
		prev_stop = layout->list[i].stop;
	}

	if ((last_stop - prev_stop) || is_virgin)
	    hole_cnt++;
	holes += (last_stop - prev_stop);

	if (holes_p)
		*holes_p = hole_cnt;

	if (overlaps_p)
		*overlaps_p = overlap_cnt;

	if (missing_p)
		*missing_p = missing;

	if (down_p)
		*down_p = down;

	if (misc_p)
		*misc_p = misc;

	return ret;
}


int
dht_layout_normalize (xlator_t *this, loc_t *loc, dht_layout_t *layout)
{
	int          ret   = 0;
	int          i = 0;
	uint32_t     holes = 0;
	uint32_t     overlaps = 0;
	uint32_t     missing = 0;
	uint32_t     down = 0;
	uint32_t     misc = 0;


	ret = dht_layout_sort (layout);
	if (ret == -1) {
		gf_log (this->name, GF_LOG_ERROR,
			"sort failed?! how the ....");
		goto out;
	}

	ret = dht_layout_anomalies (this, loc, layout,
				    &holes, &overlaps,
				    &missing, &down, &misc);
	if (ret == -1) {
		gf_log (this->name, GF_LOG_ERROR,
			"error while finding anomalies in %s -- not good news",
			loc->path);
		goto out;
	}

	if (holes || overlaps) {
		if (missing == layout->cnt) {
			gf_log (this->name, GF_LOG_WARNING,
				"directory %s looked up first time",
				loc->path);
		} else {
			gf_log (this->name, GF_LOG_ERROR,
				"found anomalies in %s. holes=%d overlaps=%d",
				loc->path, holes, overlaps);
		}
		ret = 1;
	}

	for (i = 0; i < layout->cnt; i++) {
	/* TODO During DHT selfheal rewrite (almost) find a better place to 
	 * detect this - probably in dht_layout_anomalies() 
	 */
		if (layout->list[i].err == ENOENT) {
			gf_log (this->name, GF_LOG_WARNING,
				"path=%s ENOENT - directory entry"
				" should be created in selfheal", loc->path);
			ret = 1;
			break;
		}
	}

out:
	return ret;
}


int
dht_layout_dir_mismatch (xlator_t *this, dht_layout_t *layout, xlator_t *subvol,
			 loc_t *loc, dict_t *xattr)
{
	int       idx = 0;
	int       pos = -1;
	int       ret = 0;
        int       err = 0;
	int32_t  *disk_layout = NULL;
	int32_t   count = -1;
	uint32_t  start_off = -1;
	uint32_t  stop_off = -1;


	for (idx = 0; idx < layout->cnt; idx++) {
		if (layout->list[idx].xlator == subvol) {
			pos = idx;
			break;
		}
	}
	
	if (pos == -1) {
		gf_log (this->name, GF_LOG_DEBUG,
			"%s - no layout info for subvolume %s",
			loc->path, subvol->name);
		ret = 1;
		goto out;
	}

        err = layout->list[pos].err;

	if (!xattr) {
                if (err == 0) {
                        gf_log (this->name, GF_LOG_ERROR,
                                "%s - xattr dictionary is NULL",
                                loc->path);
                        ret = -1;
                }
		goto out;
	}

	ret = dict_get_ptr (xattr, "trusted.glusterfs.dht",
			    VOID(&disk_layout));
	
	if (ret < 0) {
                if (err == 0) {
                        gf_log (this->name, GF_LOG_ERROR,
                                "%s - disk layout missing", loc->path);
                        ret = -1;
                }
		goto out;
	} 

	count  = ntoh32 (disk_layout[0]);
	if (count != 1) {
		gf_log (this->name, GF_LOG_ERROR,
			"%s - disk layout has invalid count %d",
			loc->path, count);
		ret = -1;
		goto out;
	}

	start_off = ntoh32 (disk_layout[2]);
	stop_off  = ntoh32 (disk_layout[3]);
	
	if ((layout->list[pos].start != start_off)
	    || (layout->list[pos].stop != stop_off)) {
		gf_log (this->name, GF_LOG_WARNING,
			"subvol: %s; inode layout - %"PRId32" - %"PRId32"; "
			"disk layout - %"PRId32" - %"PRId32,
			layout->list[pos].xlator->name,
			layout->list[pos].start, layout->list[pos].stop,
			start_off, stop_off);
		ret = 1;
	} else {
		ret = 0;
	}
out:
	return ret;
}