summaryrefslogtreecommitdiffstats
path: root/xlators/cluster/afr/src/afr-self-heal-entry.c
blob: df6dfaaf396f7defd04444b95bd0249921da894a (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
/*
  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
  This file is part of GlusterFS.

  This file is licensed to you under your choice of the GNU Lesser
  General Public License, version 3 or any later version (LGPLv3 or
  later), or the GNU General Public License, version 2 (GPLv2), in all
  cases as published by the Free Software Foundation.
*/


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

#include "afr.h"
#include "afr-self-heal.h"
#include "byte-order.h"
#include "afr-transaction.h"


static int
afr_selfheal_entry_delete (xlator_t *this, inode_t *dir, const char *name,
                           inode_t *inode, int child, struct afr_reply *replies)
{
	afr_private_t *priv = NULL;
	xlator_t *subvol = NULL;
	int ret = 0;
	loc_t loc = {0, };
	char g[64];

	priv = this->private;

	subvol = priv->children[child];

	loc.parent = inode_ref (dir);
	uuid_copy (loc.pargfid, dir->gfid);
	loc.name = name;
	loc.inode = inode_ref (inode);

	if (replies[child].valid && replies[child].op_ret == 0) {
		switch (replies[child].poststat.ia_type) {
		case IA_IFDIR:
			gf_log (this->name, GF_LOG_WARNING,
				"expunging dir %s/%s (%s) on %s",
				uuid_utoa (dir->gfid), name,
				uuid_utoa_r (replies[child].poststat.ia_gfid, g),
				subvol->name);
			ret = syncop_rmdir (subvol, &loc, 1);
			break;
		default:
			gf_log (this->name, GF_LOG_WARNING,
				"expunging file %s/%s (%s) on %s",
				uuid_utoa (dir->gfid), name,
				uuid_utoa_r (replies[child].poststat.ia_gfid, g),
				subvol->name);
			ret = syncop_unlink (subvol, &loc);
			break;
		}
	}

	loc_wipe (&loc);

	return ret;
}


int
afr_selfheal_recreate_entry (xlator_t *this, int dst, int source, inode_t *dir,
                             const char *name, inode_t *inode,
                             struct afr_reply *replies,
                             unsigned char *newentry)
{
	int ret = 0;
	loc_t loc = {0,};
	loc_t srcloc = {0,};
	afr_private_t *priv = NULL;
	dict_t *xdata = NULL;
	struct iatt *iatt = NULL;
	char *linkname = NULL;
	mode_t mode = 0;
	struct iatt newent = {0,};
	priv = this->private;

	xdata = dict_new();
	if (!xdata)
		return -ENOMEM;

	loc.parent = inode_ref (dir);
	uuid_copy (loc.pargfid, dir->gfid);
	loc.name = name;
	loc.inode = inode_ref (inode);

	ret = afr_selfheal_entry_delete (this, dir, name, inode, dst, replies);
	if (ret)
		goto out;

	ret = dict_set_static_bin (xdata, "gfid-req",
				   replies[source].poststat.ia_gfid, 16);
	if (ret)
		goto out;

	iatt = &replies[source].poststat;

	srcloc.inode = inode_ref (inode);
	uuid_copy (srcloc.gfid, iatt->ia_gfid);

	mode = st_mode_from_ia (iatt->ia_prot, iatt->ia_type);

	switch (iatt->ia_type) {
	case IA_IFDIR:
		ret = syncop_mkdir (priv->children[dst], &loc, mode, xdata, 0);
                if (ret == 0)
                        newentry[dst] = 1;
		break;
	case IA_IFLNK:
		ret = syncop_lookup (priv->children[dst], &srcloc, 0, 0, 0, 0);
		if (ret == 0) {
			ret = syncop_link (priv->children[dst], &srcloc, &loc);
		} else {
			ret = syncop_readlink (priv->children[source], &srcloc,
					       &linkname, 4096);
			if (ret <= 0)
				goto out;
			ret = syncop_symlink (priv->children[dst], &loc, linkname,
					      xdata, NULL);
                        if (ret == 0)
                                newentry[dst] = 1;
                }
		break;
	default:
		ret = dict_set_int32 (xdata, GLUSTERFS_INTERNAL_FOP_KEY, 1);
		if (ret)
			goto out;
		ret = syncop_mknod (priv->children[dst], &loc, mode,
				    iatt->ia_rdev, xdata, &newent);
		if (ret == 0 && newent.ia_nlink == 1) {
			/* New entry created. Mark @dst pending on all sources */
                        newentry[dst] = 1;
		}
		break;
	}

out:
	if (xdata)
		dict_unref (xdata);
	loc_wipe (&loc);
	loc_wipe (&srcloc);
	return ret;
}


static int
__afr_selfheal_heal_dirent (call_frame_t *frame, xlator_t *this, fd_t *fd,
			    char *name, inode_t *inode, int source,
			    unsigned char *sources, unsigned char *healed_sinks,
			    unsigned char *locked_on, struct afr_reply *replies)
{
	int ret = 0;
	afr_private_t *priv = NULL;
	int i = 0;
	unsigned char *newentry = NULL;

	priv = this->private;

	newentry = alloca0 (priv->child_count);

	if (!replies[source].valid)
		return -EIO;

	for (i = 0; i < priv->child_count; i++) {
		if (!healed_sinks[i])
			continue;
		if (replies[source].op_ret == -1 &&
		    replies[source].op_errno == ENOENT) {
			ret = afr_selfheal_entry_delete (this, fd->inode, name,
                                                         inode, i, replies);
		} else {
			if (!uuid_compare (replies[i].poststat.ia_gfid,
					   replies[source].poststat.ia_gfid))
				continue;

			ret = afr_selfheal_recreate_entry (this, i, source,
							   fd->inode, name, inode,
							   replies, newentry);
		}
		if (ret < 0)
			break;
	}

	if (AFR_COUNT (newentry, priv->child_count))
		afr_selfheal_newentry_mark (frame, this, inode, source, replies,
					    sources, newentry);
	return ret;
}

static int
afr_selfheal_detect_gfid_and_type_mismatch (xlator_t *this,
                                            struct afr_reply *replies,
                                            uuid_t pargfid, char *bname,
                                            int src_idx)
{
        int             i      = 0;
        char            g1[64] = {0,};
        char            g2[64] = {0,};
        afr_private_t  *priv   = NULL;

        priv = this->private;

        for (i = 0; i < priv->child_count; i++) {
                if (i == src_idx)
                        continue;

                if (!replies[i].valid)
                        continue;

                if (replies[i].op_ret != 0)
                        continue;

                if (uuid_compare (replies[src_idx].poststat.ia_gfid,
                                  replies[i].poststat.ia_gfid)) {
                        gf_log (this->name, GF_LOG_ERROR, "Gfid mismatch "
                                "detected for <%s/%s>, %s on %s and %s on %s. "
                                "Skipping conservative merge on the file.",
                                uuid_utoa (pargfid), bname,
                                uuid_utoa_r (replies[i].poststat.ia_gfid, g1),
                                priv->children[i]->name,
                                uuid_utoa_r (replies[src_idx].poststat.ia_gfid,
                                g2), priv->children[src_idx]->name);
                        return -1;
                }

                if ((replies[src_idx].poststat.ia_type) !=
                    (replies[i].poststat.ia_type)) {
                        gf_log (this->name, GF_LOG_ERROR, "Type mismatch "
                                "detected for <%s/%s>, %d on %s and %d on %s. "
                                "Skipping conservative merge on the file.",
                                uuid_utoa (pargfid), bname,
                                replies[i].poststat.ia_type,
                                priv->children[i]->name,
                                replies[src_idx].poststat.ia_type,
                                priv->children[src_idx]->name);
                        return -1;
                }
        }

        return 0;
}

static int
__afr_selfheal_merge_dirent (call_frame_t *frame, xlator_t *this, fd_t *fd,
			     char *name, inode_t *inode, unsigned char *sources,
			     unsigned char *healed_sinks, unsigned char *locked_on,
			     struct afr_reply *replies)
{
        int             ret       = 0;
        int             i         = 0;
        int             source    = -1;
        unsigned char  *newentry  = NULL;
        afr_private_t  *priv      = NULL;

	priv = this->private;

	newentry = alloca0 (priv->child_count);

	for (i = 0; i < priv->child_count; i++) {
		if (replies[i].valid && replies[i].op_ret == 0) {
			source = i;
			break;
		}
	}

	if (source == -1) {
		/* entry got deleted in the mean time? */
		return 0;
	}

        /* In case of a gfid or type mismatch on the entry, return -1.*/
        ret = afr_selfheal_detect_gfid_and_type_mismatch (this, replies,
                                                          fd->inode->gfid,
                                                          name, source);

        if (ret < 0)
                return ret;

	for (i = 0; i < priv->child_count; i++) {
		if (i == source || !healed_sinks[i])
			continue;

		if (replies[i].op_errno != ENOENT)
			continue;

		ret = afr_selfheal_recreate_entry (this, i, source, fd->inode,
                                                   name, inode, replies,
                                                   newentry);
	}

	if (AFR_COUNT (newentry, priv->child_count))
		afr_selfheal_newentry_mark (frame, this, inode, source, replies,
					    sources, newentry);
	return ret;
}


static int
__afr_selfheal_entry_dirent (call_frame_t *frame, xlator_t *this, fd_t *fd,
                             char *name, inode_t *inode, int source,
                             unsigned char *sources, unsigned char *healed_sinks,
                             unsigned char *locked_on,
                             struct afr_reply *replies)
{
	int ret = -1;

	if (source < 0)
		ret = __afr_selfheal_merge_dirent (frame, this, fd, name, inode,
						   sources, healed_sinks,
						   locked_on, replies);
	else
		ret = __afr_selfheal_heal_dirent (frame, this, fd, name, inode,
						  source, sources, healed_sinks,
						  locked_on, replies);
	return ret;
}

static int
__afr_selfheal_entry_finalize_source (xlator_t *this, unsigned char *sources,
				      unsigned char *healed_sinks,
				      unsigned char *locked_on)
{
	int i = 0;
	afr_private_t *priv = NULL;
	int source = -1;
	int sources_count = 0;

	priv = this->private;

	sources_count = AFR_COUNT (sources, priv->child_count);

	if ((AFR_CMP (locked_on, healed_sinks, priv->child_count) == 0)
            || !sources_count) {
		return -1;
	}

	for (i = 0; i < priv->child_count; i++) {
		if (sources[i]) {
			source = i;
			break;
		}
	}

	return source;
}


static int
__afr_selfheal_entry_prepare (call_frame_t *frame, xlator_t *this, fd_t *fd,
			      unsigned char *locked_on, unsigned char *sources,
			      unsigned char *sinks, unsigned char *healed_sinks,
			      struct afr_reply *replies, int *source_p)
{
	int ret = -1;
	int source = -1;
	afr_private_t *priv = NULL;

	priv = this->private;

	ret = afr_selfheal_unlocked_discover (frame, fd->inode, fd->inode->gfid,
					      replies);
	if (ret)
		return ret;

	ret = afr_selfheal_find_direction (this, replies, AFR_ENTRY_TRANSACTION,
					   locked_on, sources, sinks);
	if (ret)
		return ret;

        /* Initialize the healed_sinks[] array optimistically to
           the intersection of to-be-healed (i.e sinks[]) and
           the list of servers which are up (i.e locked_on[]).

           As we encounter failures in the healing process, we
           will unmark the respective servers in the healed_sinks[]
           array.
        */
        AFR_INTERSECT (healed_sinks, sinks, locked_on, priv->child_count);

	source = __afr_selfheal_entry_finalize_source (this, sources,
                                                       healed_sinks, locked_on);
	if (source < 0) {
		/* If source is < 0 (typically split-brain), we perform a
		   conservative merge of entries rather than erroring out */
	}
	*source_p = source;

	return ret;
}


static int
afr_selfheal_entry_dirent (call_frame_t *frame, xlator_t *this,
                           fd_t *fd, char *name)
{
        int                ret          = 0;
        int                source       = -1;
        unsigned char     *locked_on    = NULL;
        unsigned char     *sources      = NULL;
        unsigned char     *sinks        = NULL;
        unsigned char     *healed_sinks = NULL;
        inode_t           *inode        = NULL;
        struct afr_reply  *replies      = NULL;
        struct afr_reply  *par_replies  = NULL;
        afr_private_t     *priv         = NULL;

	priv = this->private;

        sources = alloca0 (priv->child_count);
        sinks   = alloca0 (priv->child_count);
        healed_sinks = alloca0 (priv->child_count);
	locked_on = alloca0 (priv->child_count);

	replies = alloca0 (priv->child_count * sizeof(*replies));
	par_replies = alloca0 (priv->child_count * sizeof(*par_replies));

        ret = afr_selfheal_entrylk (frame, this, fd->inode, this->name, NULL,
                                    locked_on);
	{
		if (ret < AFR_SH_MIN_PARTICIPANTS) {
                        gf_log (this->name, GF_LOG_DEBUG, "%s: Skipping "
                                "entry self-heal as only %d sub-volumes could "
                                "be locked in %s domain",
                                uuid_utoa (fd->inode->gfid), ret, this->name);
			ret = -ENOTCONN;
			goto unlock;
		}

                ret = __afr_selfheal_entry_prepare (frame, this, fd, locked_on,
                                                    sources, sinks,
                                                    healed_sinks, par_replies,
                                                    &source);
                if (ret < 0)
                        goto unlock;

		inode = afr_selfheal_unlocked_lookup_on (frame, fd->inode, name,
							 replies, locked_on,
                                                         NULL);
		if (!inode) {
			ret = -ENOMEM;
			goto unlock;
		}

		ret = __afr_selfheal_entry_dirent (frame, this, fd, name, inode,
						   source, sources, healed_sinks,
						   locked_on, replies);
	}
unlock:
        afr_selfheal_unentrylk (frame, this, fd->inode, this->name, NULL,
                                locked_on);
	if (inode)
		inode_unref (inode);
        if (replies)
                afr_replies_wipe (replies, priv->child_count);
        if (par_replies)
                afr_replies_wipe (par_replies, priv->child_count);

	return ret;
}


static int
afr_selfheal_entry_do_subvol (call_frame_t *frame, xlator_t *this,
                              fd_t *fd, int child)
{
	int ret = 0;
	gf_dirent_t entries;
	gf_dirent_t *entry = NULL;
	off_t offset = 0;
	call_frame_t *iter_frame = NULL;
	xlator_t *subvol = NULL;
	afr_private_t *priv = NULL;

	priv = this->private;
	subvol = priv->children[child];

	INIT_LIST_HEAD (&entries.list);

	iter_frame = afr_copy_frame (frame);
	if (!iter_frame)
		return -ENOMEM;

	while ((ret = syncop_readdir (subvol, fd, 131072, offset, &entries))) {
		if (ret > 0)
			ret = 0;
		list_for_each_entry (entry, &entries.list, list) {
			offset = entry->d_off;

			if (!strcmp (entry->d_name, ".") ||
			    !strcmp (entry->d_name, ".."))
				continue;

			if (__is_root_gfid (fd->inode->gfid) &&
			    !strcmp (entry->d_name, GF_REPLICATE_TRASH_DIR))
				continue;

			ret = afr_selfheal_entry_dirent (iter_frame, this, fd,
                                                         entry->d_name);
			AFR_STACK_RESET (iter_frame);

			if (ret)
				break;
		}

		gf_dirent_free (&entries);
		if (ret)
			break;
	}

	AFR_STACK_DESTROY (iter_frame);
	return ret;
}

static int
afr_selfheal_entry_do (call_frame_t *frame, xlator_t *this, fd_t *fd,
		       int source, unsigned char *sources,
		       unsigned char *healed_sinks)
{
	int i = 0;
	afr_private_t *priv = NULL;
	int ret = 0;

	priv = this->private;

	gf_log (this->name, GF_LOG_INFO, "performing entry selfheal on %s",
		uuid_utoa (fd->inode->gfid));

	for (i = 0; i < priv->child_count; i++) {
		if (i != source && !healed_sinks[i])
			continue;
		ret = afr_selfheal_entry_do_subvol (frame, this, fd, i);
		if (ret)
			break;
	}
	return ret;
}



static int
__afr_selfheal_entry (call_frame_t *frame, xlator_t *this, fd_t *fd,
		      unsigned char *locked_on)
{
	int                     ret                   = -1;
	int                     source                = -1;
	unsigned char          *sources               = NULL;
	unsigned char          *sinks                 = NULL;
	unsigned char          *data_lock             = NULL;
	unsigned char          *healed_sinks          = NULL;
	struct afr_reply       *locked_replies        = NULL;
	afr_private_t          *priv                  = NULL;

	priv = this->private;

	sources = alloca0 (priv->child_count);
	sinks = alloca0 (priv->child_count);
	healed_sinks = alloca0 (priv->child_count);
	data_lock = alloca0 (priv->child_count);

	locked_replies = alloca0 (sizeof (*locked_replies) * priv->child_count);

	ret = afr_selfheal_entrylk (frame, this, fd->inode, this->name, NULL,
				    data_lock);
	{
		if (ret < AFR_SH_MIN_PARTICIPANTS) {
                        gf_log (this->name, GF_LOG_DEBUG, "%s: Skipping "
                                "entry self-heal as only %d sub-volumes could "
                                "be locked in %s domain",
                                uuid_utoa (fd->inode->gfid), ret,
                                this->name);
			ret = -ENOTCONN;
			goto unlock;
		}

		ret = __afr_selfheal_entry_prepare (frame, this, fd, data_lock,
						    sources, sinks, healed_sinks,
						    locked_replies, &source);
	}
unlock:
	afr_selfheal_unentrylk (frame, this, fd->inode, this->name, NULL,
				data_lock);
	if (ret < 0)
		goto out;

	ret = afr_selfheal_entry_do (frame, this, fd, source, sources,
                                     healed_sinks);
	if (ret)
		goto out;

	ret = afr_selfheal_undo_pending (frame, this, fd->inode, sources, sinks,
					 healed_sinks, AFR_ENTRY_TRANSACTION,
                                         locked_replies, data_lock);
out:
        afr_log_selfheal (fd->inode->gfid, this, ret, "entry", source,
                          healed_sinks);

        if (locked_replies)
                afr_replies_wipe (locked_replies, priv->child_count);
	return ret;
}


static fd_t *
afr_selfheal_data_opendir (xlator_t *this, inode_t *inode)
{
	loc_t loc = {0,};
	int ret = 0;
	fd_t *fd = NULL;

	fd = fd_create (inode, 0);
	if (!fd)
		return NULL;

	loc.inode = inode_ref (inode);
	uuid_copy (loc.gfid, inode->gfid);

	ret = syncop_opendir (this, &loc, fd);
	if (ret) {
		fd_unref (fd);
		fd = NULL;
	} else {
		fd_bind (fd);
	}

	loc_wipe (&loc);
        return fd;
}


int
afr_selfheal_entry (call_frame_t *frame, xlator_t *this, inode_t *inode)
{
	afr_private_t *priv = NULL;
	unsigned char *locked_on = NULL;
	fd_t *fd = NULL;
	int ret = 0;

	priv = this->private;

	fd = afr_selfheal_data_opendir (this, inode);
	if (!fd)
		return -EIO;

	locked_on = alloca0 (priv->child_count);

	ret = afr_selfheal_tryentrylk (frame, this, inode, priv->sh_domain, NULL,
				       locked_on);
	{
		if (ret < AFR_SH_MIN_PARTICIPANTS) {
                        gf_log (this->name, GF_LOG_DEBUG, "%s: Skipping "
                                "entry self-heal as only %d sub-volumes could "
                                "be locked in %s domain",
                                uuid_utoa (fd->inode->gfid), ret,
                                priv->sh_domain);
			/* Either less than two subvols available, or another
			   selfheal (from another server) is in progress. Skip
			   for now in any case there isn't anything to do.
			*/
			ret = -ENOTCONN;
			goto unlock;
		}

		ret = __afr_selfheal_entry (frame, this, fd, locked_on);
	}
unlock:
	afr_selfheal_unentrylk (frame, this, inode, priv->sh_domain, NULL, locked_on);

	if (fd)
		fd_unref (fd);

	return ret;
}