summaryrefslogtreecommitdiff
path: root/fs/btrfs/tests/extent-map-tests.c
blob: 319fed82d741fa846164fbfce0ba165364b532ad (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2017 Oracle.  All rights reserved.
 */

#include <linux/types.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../volumes.h"
#include "../disk-io.h"
#include "../block-group.h"

static void free_extent_map_tree(struct extent_map_tree *em_tree)
{
	struct extent_map *em;
	struct rb_node *node;

	while (!RB_EMPTY_ROOT(&em_tree->map.rb_root)) {
		node = rb_first_cached(&em_tree->map);
		em = rb_entry(node, struct extent_map, rb_node);
		remove_extent_mapping(em_tree, em);

#ifdef CONFIG_BTRFS_DEBUG
		if (refcount_read(&em->refs) != 1) {
			test_err(
"em leak: em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx) refs %d",
				 em->start, em->len, em->block_start,
				 em->block_len, refcount_read(&em->refs));

			refcount_set(&em->refs, 1);
		}
#endif
		free_extent_map(em);
	}
}

/*
 * Test scenario:
 *
 * Suppose that no extent map has been loaded into memory yet, there is a file
 * extent [0, 16K), followed by another file extent [16K, 20K), two dio reads
 * are entering btrfs_get_extent() concurrently, t1 is reading [8K, 16K), t2 is
 * reading [0, 8K)
 *
 *     t1                            t2
 *  btrfs_get_extent()              btrfs_get_extent()
 *    -> lookup_extent_mapping()      ->lookup_extent_mapping()
 *    -> add_extent_mapping(0, 16K)
 *    -> return em
 *                                    ->add_extent_mapping(0, 16K)
 *                                    -> #handle -EEXIST
 */
static int test_case_1(struct btrfs_fs_info *fs_info,
		struct extent_map_tree *em_tree)
{
	struct extent_map *em;
	u64 start = 0;
	u64 len = SZ_8K;
	int ret;

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		return -ENOMEM;
	}

	/* Add [0, 16K) */
	em->start = 0;
	em->len = SZ_16K;
	em->block_start = 0;
	em->block_len = SZ_16K;
	write_lock(&em_tree->lock);
	ret = add_extent_mapping(em_tree, em, 0);
	write_unlock(&em_tree->lock);
	if (ret < 0) {
		test_err("cannot add extent range [0, 16K)");
		goto out;
	}
	free_extent_map(em);

	/* Add [16K, 20K) following [0, 16K)  */
	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		ret = -ENOMEM;
		goto out;
	}

	em->start = SZ_16K;
	em->len = SZ_4K;
	em->block_start = SZ_32K; /* avoid merging */
	em->block_len = SZ_4K;
	write_lock(&em_tree->lock);
	ret = add_extent_mapping(em_tree, em, 0);
	write_unlock(&em_tree->lock);
	if (ret < 0) {
		test_err("cannot add extent range [16K, 20K)");
		goto out;
	}
	free_extent_map(em);

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		ret = -ENOMEM;
		goto out;
	}

	/* Add [0, 8K), should return [0, 16K) instead. */
	em->start = start;
	em->len = len;
	em->block_start = start;
	em->block_len = len;
	write_lock(&em_tree->lock);
	ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
	write_unlock(&em_tree->lock);
	if (ret) {
		test_err("case1 [%llu %llu]: ret %d", start, start + len, ret);
		goto out;
	}
	if (em &&
	    (em->start != 0 || extent_map_end(em) != SZ_16K ||
	     em->block_start != 0 || em->block_len != SZ_16K)) {
		test_err(
"case1 [%llu %llu]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
			 start, start + len, ret, em->start, em->len,
			 em->block_start, em->block_len);
		ret = -EINVAL;
	}
	free_extent_map(em);
out:
	free_extent_map_tree(em_tree);

	return ret;
}

/*
 * Test scenario:
 *
 * Reading the inline ending up with EEXIST, ie. read an inline
 * extent and discard page cache and read it again.
 */
static int test_case_2(struct btrfs_fs_info *fs_info,
		struct extent_map_tree *em_tree)
{
	struct extent_map *em;
	int ret;

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		return -ENOMEM;
	}

	/* Add [0, 1K) */
	em->start = 0;
	em->len = SZ_1K;
	em->block_start = EXTENT_MAP_INLINE;
	em->block_len = (u64)-1;
	write_lock(&em_tree->lock);
	ret = add_extent_mapping(em_tree, em, 0);
	write_unlock(&em_tree->lock);
	if (ret < 0) {
		test_err("cannot add extent range [0, 1K)");
		goto out;
	}
	free_extent_map(em);

	/* Add [4K, 8K) following [0, 1K)  */
	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		ret = -ENOMEM;
		goto out;
	}

	em->start = SZ_4K;
	em->len = SZ_4K;
	em->block_start = SZ_4K;
	em->block_len = SZ_4K;
	write_lock(&em_tree->lock);
	ret = add_extent_mapping(em_tree, em, 0);
	write_unlock(&em_tree->lock);
	if (ret < 0) {
		test_err("cannot add extent range [4K, 8K)");
		goto out;
	}
	free_extent_map(em);

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		ret = -ENOMEM;
		goto out;
	}

	/* Add [0, 1K) */
	em->start = 0;
	em->len = SZ_1K;
	em->block_start = EXTENT_MAP_INLINE;
	em->block_len = (u64)-1;
	write_lock(&em_tree->lock);
	ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
	write_unlock(&em_tree->lock);
	if (ret) {
		test_err("case2 [0 1K]: ret %d", ret);
		goto out;
	}
	if (em &&
	    (em->start != 0 || extent_map_end(em) != SZ_1K ||
	     em->block_start != EXTENT_MAP_INLINE || em->block_len != (u64)-1)) {
		test_err(
"case2 [0 1K]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
			 ret, em->start, em->len, em->block_start,
			 em->block_len);
		ret = -EINVAL;
	}
	free_extent_map(em);
out:
	free_extent_map_tree(em_tree);

	return ret;
}

static int __test_case_3(struct btrfs_fs_info *fs_info,
		struct extent_map_tree *em_tree, u64 start)
{
	struct extent_map *em;
	u64 len = SZ_4K;
	int ret;

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		return -ENOMEM;
	}

	/* Add [4K, 8K) */
	em->start = SZ_4K;
	em->len = SZ_4K;
	em->block_start = SZ_4K;
	em->block_len = SZ_4K;
	write_lock(&em_tree->lock);
	ret = add_extent_mapping(em_tree, em, 0);
	write_unlock(&em_tree->lock);
	if (ret < 0) {
		test_err("cannot add extent range [4K, 8K)");
		goto out;
	}
	free_extent_map(em);

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		ret = -ENOMEM;
		goto out;
	}

	/* Add [0, 16K) */
	em->start = 0;
	em->len = SZ_16K;
	em->block_start = 0;
	em->block_len = SZ_16K;
	write_lock(&em_tree->lock);
	ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
	write_unlock(&em_tree->lock);
	if (ret) {
		test_err("case3 [0x%llx 0x%llx): ret %d",
			 start, start + len, ret);
		goto out;
	}
	/*
	 * Since bytes within em are contiguous, em->block_start is identical to
	 * em->start.
	 */
	if (em &&
	    (start < em->start || start + len > extent_map_end(em) ||
	     em->start != em->block_start || em->len != em->block_len)) {
		test_err(
"case3 [0x%llx 0x%llx): ret %d em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx)",
			 start, start + len, ret, em->start, em->len,
			 em->block_start, em->block_len);
		ret = -EINVAL;
	}
	free_extent_map(em);
out:
	free_extent_map_tree(em_tree);

	return ret;
}

/*
 * Test scenario:
 *
 * Suppose that no extent map has been loaded into memory yet.
 * There is a file extent [0, 16K), two jobs are running concurrently
 * against it, t1 is buffered writing to [4K, 8K) and t2 is doing dio
 * read from [0, 4K) or [8K, 12K) or [12K, 16K).
 *
 * t1 goes ahead of t2 and adds em [4K, 8K) into tree.
 *
 *         t1                       t2
 *  cow_file_range()	     btrfs_get_extent()
 *                            -> lookup_extent_mapping()
 *   -> add_extent_mapping()
 *                            -> add_extent_mapping()
 */
static int test_case_3(struct btrfs_fs_info *fs_info,
		struct extent_map_tree *em_tree)
{
	int ret;

	ret = __test_case_3(fs_info, em_tree, 0);
	if (ret)
		return ret;
	ret = __test_case_3(fs_info, em_tree, SZ_8K);
	if (ret)
		return ret;
	ret = __test_case_3(fs_info, em_tree, (12 * SZ_1K));

	return ret;
}

static int __test_case_4(struct btrfs_fs_info *fs_info,
		struct extent_map_tree *em_tree, u64 start)
{
	struct extent_map *em;
	u64 len = SZ_4K;
	int ret;

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		return -ENOMEM;
	}

	/* Add [0K, 8K) */
	em->start = 0;
	em->len = SZ_8K;
	em->block_start = 0;
	em->block_len = SZ_8K;
	write_lock(&em_tree->lock);
	ret = add_extent_mapping(em_tree, em, 0);
	write_unlock(&em_tree->lock);
	if (ret < 0) {
		test_err("cannot add extent range [0, 8K)");
		goto out;
	}
	free_extent_map(em);

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		ret = -ENOMEM;
		goto out;
	}

	/* Add [8K, 32K) */
	em->start = SZ_8K;
	em->len = 24 * SZ_1K;
	em->block_start = SZ_16K; /* avoid merging */
	em->block_len = 24 * SZ_1K;
	write_lock(&em_tree->lock);
	ret = add_extent_mapping(em_tree, em, 0);
	write_unlock(&em_tree->lock);
	if (ret < 0) {
		test_err("cannot add extent range [8K, 32K)");
		goto out;
	}
	free_extent_map(em);

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		ret = -ENOMEM;
		goto out;
	}
	/* Add [0K, 32K) */
	em->start = 0;
	em->len = SZ_32K;
	em->block_start = 0;
	em->block_len = SZ_32K;
	write_lock(&em_tree->lock);
	ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
	write_unlock(&em_tree->lock);
	if (ret) {
		test_err("case4 [0x%llx 0x%llx): ret %d",
			 start, len, ret);
		goto out;
	}
	if (em && (start < em->start || start + len > extent_map_end(em))) {
		test_err(
"case4 [0x%llx 0x%llx): ret %d, added wrong em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx)",
			 start, len, ret, em->start, em->len, em->block_start,
			 em->block_len);
		ret = -EINVAL;
	}
	free_extent_map(em);
out:
	free_extent_map_tree(em_tree);

	return ret;
}

/*
 * Test scenario:
 *
 * Suppose that no extent map has been loaded into memory yet.
 * There is a file extent [0, 32K), two jobs are running concurrently
 * against it, t1 is doing dio write to [8K, 32K) and t2 is doing dio
 * read from [0, 4K) or [4K, 8K).
 *
 * t1 goes ahead of t2 and splits em [0, 32K) to em [0K, 8K) and [8K 32K).
 *
 *         t1                                t2
 *  btrfs_get_blocks_direct()	       btrfs_get_blocks_direct()
 *   -> btrfs_get_extent()              -> btrfs_get_extent()
 *       -> lookup_extent_mapping()
 *       -> add_extent_mapping()            -> lookup_extent_mapping()
 *          # load [0, 32K)
 *   -> btrfs_new_extent_direct()
 *       -> btrfs_drop_extent_cache()
 *          # split [0, 32K)
 *       -> add_extent_mapping()
 *          # add [8K, 32K)
 *                                          -> add_extent_mapping()
 *                                             # handle -EEXIST when adding
 *                                             # [0, 32K)
 */
static int test_case_4(struct btrfs_fs_info *fs_info,
		struct extent_map_tree *em_tree)
{
	int ret;

	ret = __test_case_4(fs_info, em_tree, 0);
	if (ret)
		return ret;
	ret = __test_case_4(fs_info, em_tree, SZ_4K);

	return ret;
}

struct rmap_test_vector {
	u64 raid_type;
	u64 physical_start;
	u64 data_stripe_size;
	u64 num_data_stripes;
	u64 num_stripes;
	/* Assume we won't have more than 5 physical stripes */
	u64 data_stripe_phys_start[5];
	bool expected_mapped_addr;
	/* Physical to logical addresses */
	u64 mapped_logical[5];
};

static int test_rmap_block(struct btrfs_fs_info *fs_info,
			   struct rmap_test_vector *test)
{
	struct extent_map *em;
	struct map_lookup *map = NULL;
	u64 *logical = NULL;
	int i, out_ndaddrs, out_stripe_len;
	int ret;

	em = alloc_extent_map();
	if (!em) {
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		return -ENOMEM;
	}

	map = kmalloc(map_lookup_size(test->num_stripes), GFP_KERNEL);
	if (!map) {
		kfree(em);
		test_std_err(TEST_ALLOC_EXTENT_MAP);
		return -ENOMEM;
	}

	set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
	/* Start at 4GiB logical address */
	em->start = SZ_4G;
	em->len = test->data_stripe_size * test->num_data_stripes;
	em->block_len = em->len;
	em->orig_block_len = test->data_stripe_size;
	em->map_lookup = map;

	map->num_stripes = test->num_stripes;
	map->stripe_len = BTRFS_STRIPE_LEN;
	map->type = test->raid_type;

	for (i = 0; i < map->num_stripes; i++) {
		struct btrfs_device *dev = btrfs_alloc_dummy_device(fs_info);

		if (IS_ERR(dev)) {
			test_err("cannot allocate device");
			ret = PTR_ERR(dev);
			goto out;
		}
		map->stripes[i].dev = dev;
		map->stripes[i].physical = test->data_stripe_phys_start[i];
	}

	write_lock(&fs_info->mapping_tree.lock);
	ret = add_extent_mapping(&fs_info->mapping_tree, em, 0);
	write_unlock(&fs_info->mapping_tree.lock);
	if (ret) {
		test_err("error adding block group mapping to mapping tree");
		goto out_free;
	}

	ret = btrfs_rmap_block(fs_info, em->start, NULL, btrfs_sb_offset(1),
			       &logical, &out_ndaddrs, &out_stripe_len);
	if (ret || (out_ndaddrs == 0 && test->expected_mapped_addr)) {
		test_err("didn't rmap anything but expected %d",
			 test->expected_mapped_addr);
		goto out;
	}

	if (out_stripe_len != BTRFS_STRIPE_LEN) {
		test_err("calculated stripe length doesn't match");
		goto out;
	}

	if (out_ndaddrs != test->expected_mapped_addr) {
		for (i = 0; i < out_ndaddrs; i++)
			test_msg("mapped %llu", logical[i]);
		test_err("unexpected number of mapped addresses: %d", out_ndaddrs);
		goto out;
	}

	for (i = 0; i < out_ndaddrs; i++) {
		if (logical[i] != test->mapped_logical[i]) {
			test_err("unexpected logical address mapped");
			goto out;
		}
	}

	ret = 0;
out:
	write_lock(&fs_info->mapping_tree.lock);
	remove_extent_mapping(&fs_info->mapping_tree, em);
	write_unlock(&fs_info->mapping_tree.lock);
	/* For us */
	free_extent_map(em);
out_free:
	/* For the tree */
	free_extent_map(em);
	kfree(logical);
	return ret;
}

int btrfs_test_extent_map(void)
{
	struct btrfs_fs_info *fs_info = NULL;
	struct extent_map_tree *em_tree;
	int ret = 0, i;
	struct rmap_test_vector rmap_tests[] = {
		{
			/*
			 * Test a chunk with 2 data stripes one of which
			 * intersects the physical address of the super block
			 * is correctly recognised.
			 */
			.raid_type = BTRFS_BLOCK_GROUP_RAID1,
			.physical_start = SZ_64M - SZ_4M,
			.data_stripe_size = SZ_256M,
			.num_data_stripes = 2,
			.num_stripes = 2,
			.data_stripe_phys_start =
				{SZ_64M - SZ_4M, SZ_64M - SZ_4M + SZ_256M},
			.expected_mapped_addr = true,
			.mapped_logical= {SZ_4G + SZ_4M}
		},
		{
			/*
			 * Test that out-of-range physical addresses are
			 * ignored
			 */

			 /* SINGLE chunk type */
			.raid_type = 0,
			.physical_start = SZ_4G,
			.data_stripe_size = SZ_256M,
			.num_data_stripes = 1,
			.num_stripes = 1,
			.data_stripe_phys_start = {SZ_256M},
			.expected_mapped_addr = false,
			.mapped_logical = {0}
		}
	};

	test_msg("running extent_map tests");

	/*
	 * Note: the fs_info is not set up completely, we only need
	 * fs_info::fsid for the tracepoint.
	 */
	fs_info = btrfs_alloc_dummy_fs_info(PAGE_SIZE, PAGE_SIZE);
	if (!fs_info) {
		test_std_err(TEST_ALLOC_FS_INFO);
		return -ENOMEM;
	}

	em_tree = kzalloc(sizeof(*em_tree), GFP_KERNEL);
	if (!em_tree) {
		ret = -ENOMEM;
		goto out;
	}

	extent_map_tree_init(em_tree);

	ret = test_case_1(fs_info, em_tree);
	if (ret)
		goto out;
	ret = test_case_2(fs_info, em_tree);
	if (ret)
		goto out;
	ret = test_case_3(fs_info, em_tree);
	if (ret)
		goto out;
	ret = test_case_4(fs_info, em_tree);

	test_msg("running rmap tests");
	for (i = 0; i < ARRAY_SIZE(rmap_tests); i++) {
		ret = test_rmap_block(fs_info, &rmap_tests[i]);
		if (ret)
			goto out;
	}

out:
	kfree(em_tree);
	btrfs_free_dummy_fs_info(fs_info);

	return ret;
}