Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2017 Oracle. All rights reserved.
4 */
5
6#include <linux/types.h>
7#include "btrfs-tests.h"
8#include "../ctree.h"
9#include "../btrfs_inode.h"
10#include "../volumes.h"
11#include "../disk-io.h"
12#include "../block-group.h"
13
14static void free_extent_map_tree(struct extent_map_tree *em_tree)
15{
16 struct extent_map *em;
17 struct rb_node *node;
18
19 write_lock(&em_tree->lock);
20 while (!RB_EMPTY_ROOT(&em_tree->map.rb_root)) {
21 node = rb_first_cached(&em_tree->map);
22 em = rb_entry(node, struct extent_map, rb_node);
23 remove_extent_mapping(em_tree, em);
24
25#ifdef CONFIG_BTRFS_DEBUG
26 if (refcount_read(&em->refs) != 1) {
27 test_err(
28"em leak: em (start %llu len %llu block_start %llu block_len %llu) refs %d",
29 em->start, em->len, em->block_start,
30 em->block_len, refcount_read(&em->refs));
31
32 refcount_set(&em->refs, 1);
33 }
34#endif
35 free_extent_map(em);
36 }
37 write_unlock(&em_tree->lock);
38}
39
40/*
41 * Test scenario:
42 *
43 * Suppose that no extent map has been loaded into memory yet, there is a file
44 * extent [0, 16K), followed by another file extent [16K, 20K), two dio reads
45 * are entering btrfs_get_extent() concurrently, t1 is reading [8K, 16K), t2 is
46 * reading [0, 8K)
47 *
48 * t1 t2
49 * btrfs_get_extent() btrfs_get_extent()
50 * -> lookup_extent_mapping() ->lookup_extent_mapping()
51 * -> add_extent_mapping(0, 16K)
52 * -> return em
53 * ->add_extent_mapping(0, 16K)
54 * -> #handle -EEXIST
55 */
56static int test_case_1(struct btrfs_fs_info *fs_info,
57 struct extent_map_tree *em_tree)
58{
59 struct extent_map *em;
60 u64 start = 0;
61 u64 len = SZ_8K;
62 int ret;
63
64 em = alloc_extent_map();
65 if (!em) {
66 test_std_err(TEST_ALLOC_EXTENT_MAP);
67 return -ENOMEM;
68 }
69
70 /* Add [0, 16K) */
71 em->start = 0;
72 em->len = SZ_16K;
73 em->block_start = 0;
74 em->block_len = SZ_16K;
75 write_lock(&em_tree->lock);
76 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
77 write_unlock(&em_tree->lock);
78 if (ret < 0) {
79 test_err("cannot add extent range [0, 16K)");
80 goto out;
81 }
82 free_extent_map(em);
83
84 /* Add [16K, 20K) following [0, 16K) */
85 em = alloc_extent_map();
86 if (!em) {
87 test_std_err(TEST_ALLOC_EXTENT_MAP);
88 ret = -ENOMEM;
89 goto out;
90 }
91
92 em->start = SZ_16K;
93 em->len = SZ_4K;
94 em->block_start = SZ_32K; /* avoid merging */
95 em->block_len = SZ_4K;
96 write_lock(&em_tree->lock);
97 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
98 write_unlock(&em_tree->lock);
99 if (ret < 0) {
100 test_err("cannot add extent range [16K, 20K)");
101 goto out;
102 }
103 free_extent_map(em);
104
105 em = alloc_extent_map();
106 if (!em) {
107 test_std_err(TEST_ALLOC_EXTENT_MAP);
108 ret = -ENOMEM;
109 goto out;
110 }
111
112 /* Add [0, 8K), should return [0, 16K) instead. */
113 em->start = start;
114 em->len = len;
115 em->block_start = start;
116 em->block_len = len;
117 write_lock(&em_tree->lock);
118 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
119 write_unlock(&em_tree->lock);
120 if (ret) {
121 test_err("case1 [%llu %llu]: ret %d", start, start + len, ret);
122 goto out;
123 }
124 if (!em) {
125 test_err("case1 [%llu %llu]: no extent map returned",
126 start, start + len);
127 ret = -ENOENT;
128 goto out;
129 }
130 if (em->start != 0 || extent_map_end(em) != SZ_16K ||
131 em->block_start != 0 || em->block_len != SZ_16K) {
132 test_err(
133"case1 [%llu %llu]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
134 start, start + len, ret, em->start, em->len,
135 em->block_start, em->block_len);
136 ret = -EINVAL;
137 }
138 free_extent_map(em);
139out:
140 free_extent_map_tree(em_tree);
141
142 return ret;
143}
144
145/*
146 * Test scenario:
147 *
148 * Reading the inline ending up with EEXIST, ie. read an inline
149 * extent and discard page cache and read it again.
150 */
151static int test_case_2(struct btrfs_fs_info *fs_info,
152 struct extent_map_tree *em_tree)
153{
154 struct extent_map *em;
155 int ret;
156
157 em = alloc_extent_map();
158 if (!em) {
159 test_std_err(TEST_ALLOC_EXTENT_MAP);
160 return -ENOMEM;
161 }
162
163 /* Add [0, 1K) */
164 em->start = 0;
165 em->len = SZ_1K;
166 em->block_start = EXTENT_MAP_INLINE;
167 em->block_len = (u64)-1;
168 write_lock(&em_tree->lock);
169 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
170 write_unlock(&em_tree->lock);
171 if (ret < 0) {
172 test_err("cannot add extent range [0, 1K)");
173 goto out;
174 }
175 free_extent_map(em);
176
177 /* Add [4K, 8K) following [0, 1K) */
178 em = alloc_extent_map();
179 if (!em) {
180 test_std_err(TEST_ALLOC_EXTENT_MAP);
181 ret = -ENOMEM;
182 goto out;
183 }
184
185 em->start = SZ_4K;
186 em->len = SZ_4K;
187 em->block_start = SZ_4K;
188 em->block_len = SZ_4K;
189 write_lock(&em_tree->lock);
190 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
191 write_unlock(&em_tree->lock);
192 if (ret < 0) {
193 test_err("cannot add extent range [4K, 8K)");
194 goto out;
195 }
196 free_extent_map(em);
197
198 em = alloc_extent_map();
199 if (!em) {
200 test_std_err(TEST_ALLOC_EXTENT_MAP);
201 ret = -ENOMEM;
202 goto out;
203 }
204
205 /* Add [0, 1K) */
206 em->start = 0;
207 em->len = SZ_1K;
208 em->block_start = EXTENT_MAP_INLINE;
209 em->block_len = (u64)-1;
210 write_lock(&em_tree->lock);
211 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
212 write_unlock(&em_tree->lock);
213 if (ret) {
214 test_err("case2 [0 1K]: ret %d", ret);
215 goto out;
216 }
217 if (!em) {
218 test_err("case2 [0 1K]: no extent map returned");
219 ret = -ENOENT;
220 goto out;
221 }
222 if (em->start != 0 || extent_map_end(em) != SZ_1K ||
223 em->block_start != EXTENT_MAP_INLINE || em->block_len != (u64)-1) {
224 test_err(
225"case2 [0 1K]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
226 ret, em->start, em->len, em->block_start,
227 em->block_len);
228 ret = -EINVAL;
229 }
230 free_extent_map(em);
231out:
232 free_extent_map_tree(em_tree);
233
234 return ret;
235}
236
237static int __test_case_3(struct btrfs_fs_info *fs_info,
238 struct extent_map_tree *em_tree, u64 start)
239{
240 struct extent_map *em;
241 u64 len = SZ_4K;
242 int ret;
243
244 em = alloc_extent_map();
245 if (!em) {
246 test_std_err(TEST_ALLOC_EXTENT_MAP);
247 return -ENOMEM;
248 }
249
250 /* Add [4K, 8K) */
251 em->start = SZ_4K;
252 em->len = SZ_4K;
253 em->block_start = SZ_4K;
254 em->block_len = SZ_4K;
255 write_lock(&em_tree->lock);
256 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
257 write_unlock(&em_tree->lock);
258 if (ret < 0) {
259 test_err("cannot add extent range [4K, 8K)");
260 goto out;
261 }
262 free_extent_map(em);
263
264 em = alloc_extent_map();
265 if (!em) {
266 test_std_err(TEST_ALLOC_EXTENT_MAP);
267 ret = -ENOMEM;
268 goto out;
269 }
270
271 /* Add [0, 16K) */
272 em->start = 0;
273 em->len = SZ_16K;
274 em->block_start = 0;
275 em->block_len = SZ_16K;
276 write_lock(&em_tree->lock);
277 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
278 write_unlock(&em_tree->lock);
279 if (ret) {
280 test_err("case3 [%llu %llu): ret %d",
281 start, start + len, ret);
282 goto out;
283 }
284 if (!em) {
285 test_err("case3 [%llu %llu): no extent map returned",
286 start, start + len);
287 ret = -ENOENT;
288 goto out;
289 }
290 /*
291 * Since bytes within em are contiguous, em->block_start is identical to
292 * em->start.
293 */
294 if (start < em->start || start + len > extent_map_end(em) ||
295 em->start != em->block_start || em->len != em->block_len) {
296 test_err(
297"case3 [%llu %llu): ret %d em (start %llu len %llu block_start %llu block_len %llu)",
298 start, start + len, ret, em->start, em->len,
299 em->block_start, em->block_len);
300 ret = -EINVAL;
301 }
302 free_extent_map(em);
303out:
304 free_extent_map_tree(em_tree);
305
306 return ret;
307}
308
309/*
310 * Test scenario:
311 *
312 * Suppose that no extent map has been loaded into memory yet.
313 * There is a file extent [0, 16K), two jobs are running concurrently
314 * against it, t1 is buffered writing to [4K, 8K) and t2 is doing dio
315 * read from [0, 4K) or [8K, 12K) or [12K, 16K).
316 *
317 * t1 goes ahead of t2 and adds em [4K, 8K) into tree.
318 *
319 * t1 t2
320 * cow_file_range() btrfs_get_extent()
321 * -> lookup_extent_mapping()
322 * -> add_extent_mapping()
323 * -> add_extent_mapping()
324 */
325static int test_case_3(struct btrfs_fs_info *fs_info,
326 struct extent_map_tree *em_tree)
327{
328 int ret;
329
330 ret = __test_case_3(fs_info, em_tree, 0);
331 if (ret)
332 return ret;
333 ret = __test_case_3(fs_info, em_tree, SZ_8K);
334 if (ret)
335 return ret;
336 ret = __test_case_3(fs_info, em_tree, (12 * SZ_1K));
337
338 return ret;
339}
340
341static int __test_case_4(struct btrfs_fs_info *fs_info,
342 struct extent_map_tree *em_tree, u64 start)
343{
344 struct extent_map *em;
345 u64 len = SZ_4K;
346 int ret;
347
348 em = alloc_extent_map();
349 if (!em) {
350 test_std_err(TEST_ALLOC_EXTENT_MAP);
351 return -ENOMEM;
352 }
353
354 /* Add [0K, 8K) */
355 em->start = 0;
356 em->len = SZ_8K;
357 em->block_start = 0;
358 em->block_len = SZ_8K;
359 write_lock(&em_tree->lock);
360 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
361 write_unlock(&em_tree->lock);
362 if (ret < 0) {
363 test_err("cannot add extent range [0, 8K)");
364 goto out;
365 }
366 free_extent_map(em);
367
368 em = alloc_extent_map();
369 if (!em) {
370 test_std_err(TEST_ALLOC_EXTENT_MAP);
371 ret = -ENOMEM;
372 goto out;
373 }
374
375 /* Add [8K, 32K) */
376 em->start = SZ_8K;
377 em->len = 24 * SZ_1K;
378 em->block_start = SZ_16K; /* avoid merging */
379 em->block_len = 24 * SZ_1K;
380 write_lock(&em_tree->lock);
381 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
382 write_unlock(&em_tree->lock);
383 if (ret < 0) {
384 test_err("cannot add extent range [8K, 32K)");
385 goto out;
386 }
387 free_extent_map(em);
388
389 em = alloc_extent_map();
390 if (!em) {
391 test_std_err(TEST_ALLOC_EXTENT_MAP);
392 ret = -ENOMEM;
393 goto out;
394 }
395 /* Add [0K, 32K) */
396 em->start = 0;
397 em->len = SZ_32K;
398 em->block_start = 0;
399 em->block_len = SZ_32K;
400 write_lock(&em_tree->lock);
401 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
402 write_unlock(&em_tree->lock);
403 if (ret) {
404 test_err("case4 [%llu %llu): ret %d",
405 start, start + len, ret);
406 goto out;
407 }
408 if (!em) {
409 test_err("case4 [%llu %llu): no extent map returned",
410 start, start + len);
411 ret = -ENOENT;
412 goto out;
413 }
414 if (start < em->start || start + len > extent_map_end(em)) {
415 test_err(
416"case4 [%llu %llu): ret %d, added wrong em (start %llu len %llu block_start %llu block_len %llu)",
417 start, start + len, ret, em->start, em->len, em->block_start,
418 em->block_len);
419 ret = -EINVAL;
420 }
421 free_extent_map(em);
422out:
423 free_extent_map_tree(em_tree);
424
425 return ret;
426}
427
428/*
429 * Test scenario:
430 *
431 * Suppose that no extent map has been loaded into memory yet.
432 * There is a file extent [0, 32K), two jobs are running concurrently
433 * against it, t1 is doing dio write to [8K, 32K) and t2 is doing dio
434 * read from [0, 4K) or [4K, 8K).
435 *
436 * t1 goes ahead of t2 and splits em [0, 32K) to em [0K, 8K) and [8K 32K).
437 *
438 * t1 t2
439 * btrfs_get_blocks_direct() btrfs_get_blocks_direct()
440 * -> btrfs_get_extent() -> btrfs_get_extent()
441 * -> lookup_extent_mapping()
442 * -> add_extent_mapping() -> lookup_extent_mapping()
443 * # load [0, 32K)
444 * -> btrfs_new_extent_direct()
445 * -> btrfs_drop_extent_cache()
446 * # split [0, 32K)
447 * -> add_extent_mapping()
448 * # add [8K, 32K)
449 * -> add_extent_mapping()
450 * # handle -EEXIST when adding
451 * # [0, 32K)
452 */
453static int test_case_4(struct btrfs_fs_info *fs_info,
454 struct extent_map_tree *em_tree)
455{
456 int ret;
457
458 ret = __test_case_4(fs_info, em_tree, 0);
459 if (ret)
460 return ret;
461 ret = __test_case_4(fs_info, em_tree, SZ_4K);
462
463 return ret;
464}
465
466static int add_compressed_extent(struct btrfs_fs_info *fs_info,
467 struct extent_map_tree *em_tree,
468 u64 start, u64 len, u64 block_start)
469{
470 struct extent_map *em;
471 int ret;
472
473 em = alloc_extent_map();
474 if (!em) {
475 test_std_err(TEST_ALLOC_EXTENT_MAP);
476 return -ENOMEM;
477 }
478
479 em->start = start;
480 em->len = len;
481 em->block_start = block_start;
482 em->block_len = SZ_4K;
483 em->flags |= EXTENT_FLAG_COMPRESS_ZLIB;
484 write_lock(&em_tree->lock);
485 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
486 write_unlock(&em_tree->lock);
487 free_extent_map(em);
488 if (ret < 0) {
489 test_err("cannot add extent map [%llu, %llu)", start, start + len);
490 return ret;
491 }
492
493 return 0;
494}
495
496struct extent_range {
497 u64 start;
498 u64 len;
499};
500
501/* The valid states of the tree after every drop, as described below. */
502struct extent_range valid_ranges[][7] = {
503 {
504 { .start = 0, .len = SZ_8K }, /* [0, 8K) */
505 { .start = SZ_4K * 3, .len = SZ_4K * 3}, /* [12k, 24k) */
506 { .start = SZ_4K * 6, .len = SZ_4K * 3}, /* [24k, 36k) */
507 { .start = SZ_32K + SZ_4K, .len = SZ_4K}, /* [36k, 40k) */
508 { .start = SZ_4K * 10, .len = SZ_4K * 6}, /* [40k, 64k) */
509 },
510 {
511 { .start = 0, .len = SZ_8K }, /* [0, 8K) */
512 { .start = SZ_4K * 5, .len = SZ_4K}, /* [20k, 24k) */
513 { .start = SZ_4K * 6, .len = SZ_4K * 3}, /* [24k, 36k) */
514 { .start = SZ_32K + SZ_4K, .len = SZ_4K}, /* [36k, 40k) */
515 { .start = SZ_4K * 10, .len = SZ_4K * 6}, /* [40k, 64k) */
516 },
517 {
518 { .start = 0, .len = SZ_8K }, /* [0, 8K) */
519 { .start = SZ_4K * 5, .len = SZ_4K}, /* [20k, 24k) */
520 { .start = SZ_4K * 6, .len = SZ_4K}, /* [24k, 28k) */
521 { .start = SZ_32K, .len = SZ_4K}, /* [32k, 36k) */
522 { .start = SZ_32K + SZ_4K, .len = SZ_4K}, /* [36k, 40k) */
523 { .start = SZ_4K * 10, .len = SZ_4K * 6}, /* [40k, 64k) */
524 },
525 {
526 { .start = 0, .len = SZ_8K}, /* [0, 8K) */
527 { .start = SZ_4K * 5, .len = SZ_4K}, /* [20k, 24k) */
528 { .start = SZ_4K * 6, .len = SZ_4K}, /* [24k, 28k) */
529 }
530};
531
532static int validate_range(struct extent_map_tree *em_tree, int index)
533{
534 struct rb_node *n;
535 int i;
536
537 for (i = 0, n = rb_first_cached(&em_tree->map);
538 valid_ranges[index][i].len && n;
539 i++, n = rb_next(n)) {
540 struct extent_map *entry = rb_entry(n, struct extent_map, rb_node);
541
542 if (entry->start != valid_ranges[index][i].start) {
543 test_err("mapping has start %llu expected %llu",
544 entry->start, valid_ranges[index][i].start);
545 return -EINVAL;
546 }
547
548 if (entry->len != valid_ranges[index][i].len) {
549 test_err("mapping has len %llu expected %llu",
550 entry->len, valid_ranges[index][i].len);
551 return -EINVAL;
552 }
553 }
554
555 /*
556 * We exited because we don't have any more entries in the extent_map
557 * but we still expect more valid entries.
558 */
559 if (valid_ranges[index][i].len) {
560 test_err("missing an entry");
561 return -EINVAL;
562 }
563
564 /* We exited the loop but still have entries in the extent map. */
565 if (n) {
566 test_err("we have a left over entry in the extent map we didn't expect");
567 return -EINVAL;
568 }
569
570 return 0;
571}
572
573/*
574 * Test scenario:
575 *
576 * Test the various edge cases of btrfs_drop_extent_map_range, create the
577 * following ranges
578 *
579 * [0, 12k)[12k, 24k)[24k, 36k)[36k, 40k)[40k,64k)
580 *
581 * And then we'll drop:
582 *
583 * [8k, 12k) - test the single front split
584 * [12k, 20k) - test the single back split
585 * [28k, 32k) - test the double split
586 * [32k, 64k) - test whole em dropping
587 *
588 * They'll have the EXTENT_FLAG_COMPRESSED flag set to keep the em tree from
589 * merging the em's.
590 */
591static int test_case_5(struct btrfs_fs_info *fs_info)
592{
593 struct extent_map_tree *em_tree;
594 struct inode *inode;
595 u64 start, end;
596 int ret;
597
598 test_msg("Running btrfs_drop_extent_map_range tests");
599
600 inode = btrfs_new_test_inode();
601 if (!inode) {
602 test_std_err(TEST_ALLOC_INODE);
603 return -ENOMEM;
604 }
605
606 em_tree = &BTRFS_I(inode)->extent_tree;
607
608 /* [0, 12k) */
609 ret = add_compressed_extent(fs_info, em_tree, 0, SZ_4K * 3, 0);
610 if (ret) {
611 test_err("cannot add extent range [0, 12K)");
612 goto out;
613 }
614
615 /* [12k, 24k) */
616 ret = add_compressed_extent(fs_info, em_tree, SZ_4K * 3, SZ_4K * 3, SZ_4K);
617 if (ret) {
618 test_err("cannot add extent range [12k, 24k)");
619 goto out;
620 }
621
622 /* [24k, 36k) */
623 ret = add_compressed_extent(fs_info, em_tree, SZ_4K * 6, SZ_4K * 3, SZ_8K);
624 if (ret) {
625 test_err("cannot add extent range [12k, 24k)");
626 goto out;
627 }
628
629 /* [36k, 40k) */
630 ret = add_compressed_extent(fs_info, em_tree, SZ_32K + SZ_4K, SZ_4K, SZ_4K * 3);
631 if (ret) {
632 test_err("cannot add extent range [12k, 24k)");
633 goto out;
634 }
635
636 /* [40k, 64k) */
637 ret = add_compressed_extent(fs_info, em_tree, SZ_4K * 10, SZ_4K * 6, SZ_16K);
638 if (ret) {
639 test_err("cannot add extent range [12k, 24k)");
640 goto out;
641 }
642
643 /* Drop [8k, 12k) */
644 start = SZ_8K;
645 end = (3 * SZ_4K) - 1;
646 btrfs_drop_extent_map_range(BTRFS_I(inode), start, end, false);
647 ret = validate_range(&BTRFS_I(inode)->extent_tree, 0);
648 if (ret)
649 goto out;
650
651 /* Drop [12k, 20k) */
652 start = SZ_4K * 3;
653 end = SZ_16K + SZ_4K - 1;
654 btrfs_drop_extent_map_range(BTRFS_I(inode), start, end, false);
655 ret = validate_range(&BTRFS_I(inode)->extent_tree, 1);
656 if (ret)
657 goto out;
658
659 /* Drop [28k, 32k) */
660 start = SZ_32K - SZ_4K;
661 end = SZ_32K - 1;
662 btrfs_drop_extent_map_range(BTRFS_I(inode), start, end, false);
663 ret = validate_range(&BTRFS_I(inode)->extent_tree, 2);
664 if (ret)
665 goto out;
666
667 /* Drop [32k, 64k) */
668 start = SZ_32K;
669 end = SZ_64K - 1;
670 btrfs_drop_extent_map_range(BTRFS_I(inode), start, end, false);
671 ret = validate_range(&BTRFS_I(inode)->extent_tree, 3);
672 if (ret)
673 goto out;
674out:
675 iput(inode);
676 return ret;
677}
678
679/*
680 * Test the btrfs_add_extent_mapping helper which will attempt to create an em
681 * for areas between two existing ems. Validate it doesn't do this when there
682 * are two unmerged em's side by side.
683 */
684static int test_case_6(struct btrfs_fs_info *fs_info, struct extent_map_tree *em_tree)
685{
686 struct extent_map *em = NULL;
687 int ret;
688
689 ret = add_compressed_extent(fs_info, em_tree, 0, SZ_4K, 0);
690 if (ret)
691 goto out;
692
693 ret = add_compressed_extent(fs_info, em_tree, SZ_4K, SZ_4K, 0);
694 if (ret)
695 goto out;
696
697 em = alloc_extent_map();
698 if (!em) {
699 test_std_err(TEST_ALLOC_EXTENT_MAP);
700 return -ENOMEM;
701 }
702
703 em->start = SZ_4K;
704 em->len = SZ_4K;
705 em->block_start = SZ_16K;
706 em->block_len = SZ_16K;
707 write_lock(&em_tree->lock);
708 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, 0, SZ_8K);
709 write_unlock(&em_tree->lock);
710
711 if (ret != 0) {
712 test_err("got an error when adding our em: %d", ret);
713 goto out;
714 }
715
716 ret = -EINVAL;
717 if (em->start != 0) {
718 test_err("unexpected em->start at %llu, wanted 0", em->start);
719 goto out;
720 }
721 if (em->len != SZ_4K) {
722 test_err("unexpected em->len %llu, expected 4K", em->len);
723 goto out;
724 }
725 ret = 0;
726out:
727 free_extent_map(em);
728 free_extent_map_tree(em_tree);
729 return ret;
730}
731
732/*
733 * Regression test for btrfs_drop_extent_map_range. Calling with skip_pinned ==
734 * true would mess up the start/end calculations and subsequent splits would be
735 * incorrect.
736 */
737static int test_case_7(struct btrfs_fs_info *fs_info)
738{
739 struct extent_map_tree *em_tree;
740 struct extent_map *em;
741 struct inode *inode;
742 int ret;
743
744 test_msg("Running btrfs_drop_extent_cache with pinned");
745
746 inode = btrfs_new_test_inode();
747 if (!inode) {
748 test_std_err(TEST_ALLOC_INODE);
749 return -ENOMEM;
750 }
751
752 em_tree = &BTRFS_I(inode)->extent_tree;
753
754 em = alloc_extent_map();
755 if (!em) {
756 test_std_err(TEST_ALLOC_EXTENT_MAP);
757 ret = -ENOMEM;
758 goto out;
759 }
760
761 /* [0, 16K), pinned */
762 em->start = 0;
763 em->len = SZ_16K;
764 em->block_start = 0;
765 em->block_len = SZ_4K;
766 em->flags |= EXTENT_FLAG_PINNED;
767 write_lock(&em_tree->lock);
768 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
769 write_unlock(&em_tree->lock);
770 if (ret < 0) {
771 test_err("couldn't add extent map");
772 goto out;
773 }
774 free_extent_map(em);
775
776 em = alloc_extent_map();
777 if (!em) {
778 test_std_err(TEST_ALLOC_EXTENT_MAP);
779 ret = -ENOMEM;
780 goto out;
781 }
782
783 /* [32K, 48K), not pinned */
784 em->start = SZ_32K;
785 em->len = SZ_16K;
786 em->block_start = SZ_32K;
787 em->block_len = SZ_16K;
788 write_lock(&em_tree->lock);
789 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
790 write_unlock(&em_tree->lock);
791 if (ret < 0) {
792 test_err("couldn't add extent map");
793 goto out;
794 }
795 free_extent_map(em);
796
797 /*
798 * Drop [0, 36K) This should skip the [0, 4K) extent and then split the
799 * [32K, 48K) extent.
800 */
801 btrfs_drop_extent_map_range(BTRFS_I(inode), 0, (36 * SZ_1K) - 1, true);
802
803 /* Make sure our extent maps look sane. */
804 ret = -EINVAL;
805
806 em = lookup_extent_mapping(em_tree, 0, SZ_16K);
807 if (!em) {
808 test_err("didn't find an em at 0 as expected");
809 goto out;
810 }
811
812 if (em->start != 0) {
813 test_err("em->start is %llu, expected 0", em->start);
814 goto out;
815 }
816
817 if (em->len != SZ_16K) {
818 test_err("em->len is %llu, expected 16K", em->len);
819 goto out;
820 }
821
822 free_extent_map(em);
823
824 read_lock(&em_tree->lock);
825 em = lookup_extent_mapping(em_tree, SZ_16K, SZ_16K);
826 read_unlock(&em_tree->lock);
827 if (em) {
828 test_err("found an em when we weren't expecting one");
829 goto out;
830 }
831
832 read_lock(&em_tree->lock);
833 em = lookup_extent_mapping(em_tree, SZ_32K, SZ_16K);
834 read_unlock(&em_tree->lock);
835 if (!em) {
836 test_err("didn't find an em at 32K as expected");
837 goto out;
838 }
839
840 if (em->start != (36 * SZ_1K)) {
841 test_err("em->start is %llu, expected 36K", em->start);
842 goto out;
843 }
844
845 if (em->len != (12 * SZ_1K)) {
846 test_err("em->len is %llu, expected 12K", em->len);
847 goto out;
848 }
849
850 free_extent_map(em);
851
852 read_lock(&em_tree->lock);
853 em = lookup_extent_mapping(em_tree, 48 * SZ_1K, (u64)-1);
854 read_unlock(&em_tree->lock);
855 if (em) {
856 test_err("found an unexpected em above 48K");
857 goto out;
858 }
859
860 ret = 0;
861out:
862 free_extent_map(em);
863 iput(inode);
864 return ret;
865}
866
867struct rmap_test_vector {
868 u64 raid_type;
869 u64 physical_start;
870 u64 data_stripe_size;
871 u64 num_data_stripes;
872 u64 num_stripes;
873 /* Assume we won't have more than 5 physical stripes */
874 u64 data_stripe_phys_start[5];
875 bool expected_mapped_addr;
876 /* Physical to logical addresses */
877 u64 mapped_logical[5];
878};
879
880static int test_rmap_block(struct btrfs_fs_info *fs_info,
881 struct rmap_test_vector *test)
882{
883 struct btrfs_chunk_map *map;
884 u64 *logical = NULL;
885 int i, out_ndaddrs, out_stripe_len;
886 int ret;
887
888 map = btrfs_alloc_chunk_map(test->num_stripes, GFP_KERNEL);
889 if (!map) {
890 test_std_err(TEST_ALLOC_CHUNK_MAP);
891 return -ENOMEM;
892 }
893
894 /* Start at 4GiB logical address */
895 map->start = SZ_4G;
896 map->chunk_len = test->data_stripe_size * test->num_data_stripes;
897 map->stripe_size = test->data_stripe_size;
898 map->num_stripes = test->num_stripes;
899 map->type = test->raid_type;
900
901 for (i = 0; i < map->num_stripes; i++) {
902 struct btrfs_device *dev = btrfs_alloc_dummy_device(fs_info);
903
904 if (IS_ERR(dev)) {
905 test_err("cannot allocate device");
906 ret = PTR_ERR(dev);
907 goto out;
908 }
909 map->stripes[i].dev = dev;
910 map->stripes[i].physical = test->data_stripe_phys_start[i];
911 }
912
913 ret = btrfs_add_chunk_map(fs_info, map);
914 if (ret) {
915 test_err("error adding chunk map to mapping tree");
916 goto out_free;
917 }
918
919 ret = btrfs_rmap_block(fs_info, map->start, btrfs_sb_offset(1),
920 &logical, &out_ndaddrs, &out_stripe_len);
921 if (ret || (out_ndaddrs == 0 && test->expected_mapped_addr)) {
922 test_err("didn't rmap anything but expected %d",
923 test->expected_mapped_addr);
924 goto out;
925 }
926
927 if (out_stripe_len != BTRFS_STRIPE_LEN) {
928 test_err("calculated stripe length doesn't match");
929 goto out;
930 }
931
932 if (out_ndaddrs != test->expected_mapped_addr) {
933 for (i = 0; i < out_ndaddrs; i++)
934 test_msg("mapped %llu", logical[i]);
935 test_err("unexpected number of mapped addresses: %d", out_ndaddrs);
936 goto out;
937 }
938
939 for (i = 0; i < out_ndaddrs; i++) {
940 if (logical[i] != test->mapped_logical[i]) {
941 test_err("unexpected logical address mapped");
942 goto out;
943 }
944 }
945
946 ret = 0;
947out:
948 btrfs_remove_chunk_map(fs_info, map);
949out_free:
950 kfree(logical);
951 return ret;
952}
953
954int btrfs_test_extent_map(void)
955{
956 struct btrfs_fs_info *fs_info = NULL;
957 struct extent_map_tree *em_tree;
958 int ret = 0, i;
959 struct rmap_test_vector rmap_tests[] = {
960 {
961 /*
962 * Test a chunk with 2 data stripes one of which
963 * intersects the physical address of the super block
964 * is correctly recognised.
965 */
966 .raid_type = BTRFS_BLOCK_GROUP_RAID1,
967 .physical_start = SZ_64M - SZ_4M,
968 .data_stripe_size = SZ_256M,
969 .num_data_stripes = 2,
970 .num_stripes = 2,
971 .data_stripe_phys_start =
972 {SZ_64M - SZ_4M, SZ_64M - SZ_4M + SZ_256M},
973 .expected_mapped_addr = true,
974 .mapped_logical= {SZ_4G + SZ_4M}
975 },
976 {
977 /*
978 * Test that out-of-range physical addresses are
979 * ignored
980 */
981
982 /* SINGLE chunk type */
983 .raid_type = 0,
984 .physical_start = SZ_4G,
985 .data_stripe_size = SZ_256M,
986 .num_data_stripes = 1,
987 .num_stripes = 1,
988 .data_stripe_phys_start = {SZ_256M},
989 .expected_mapped_addr = false,
990 .mapped_logical = {0}
991 }
992 };
993
994 test_msg("running extent_map tests");
995
996 /*
997 * Note: the fs_info is not set up completely, we only need
998 * fs_info::fsid for the tracepoint.
999 */
1000 fs_info = btrfs_alloc_dummy_fs_info(PAGE_SIZE, PAGE_SIZE);
1001 if (!fs_info) {
1002 test_std_err(TEST_ALLOC_FS_INFO);
1003 return -ENOMEM;
1004 }
1005
1006 em_tree = kzalloc(sizeof(*em_tree), GFP_KERNEL);
1007 if (!em_tree) {
1008 ret = -ENOMEM;
1009 goto out;
1010 }
1011
1012 extent_map_tree_init(em_tree);
1013
1014 ret = test_case_1(fs_info, em_tree);
1015 if (ret)
1016 goto out;
1017 ret = test_case_2(fs_info, em_tree);
1018 if (ret)
1019 goto out;
1020 ret = test_case_3(fs_info, em_tree);
1021 if (ret)
1022 goto out;
1023 ret = test_case_4(fs_info, em_tree);
1024 if (ret)
1025 goto out;
1026 ret = test_case_5(fs_info);
1027 if (ret)
1028 goto out;
1029 ret = test_case_6(fs_info, em_tree);
1030 if (ret)
1031 goto out;
1032 ret = test_case_7(fs_info);
1033 if (ret)
1034 goto out;
1035
1036 test_msg("running rmap tests");
1037 for (i = 0; i < ARRAY_SIZE(rmap_tests); i++) {
1038 ret = test_rmap_block(fs_info, &rmap_tests[i]);
1039 if (ret)
1040 goto out;
1041 }
1042
1043out:
1044 kfree(em_tree);
1045 btrfs_free_dummy_fs_info(fs_info);
1046
1047 return ret;
1048}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2017 Oracle. All rights reserved.
4 */
5
6#include <linux/types.h>
7#include "btrfs-tests.h"
8#include "../ctree.h"
9#include "../volumes.h"
10#include "../disk-io.h"
11#include "../block-group.h"
12
13static void free_extent_map_tree(struct extent_map_tree *em_tree)
14{
15 struct extent_map *em;
16 struct rb_node *node;
17
18 write_lock(&em_tree->lock);
19 while (!RB_EMPTY_ROOT(&em_tree->map.rb_root)) {
20 node = rb_first_cached(&em_tree->map);
21 em = rb_entry(node, struct extent_map, rb_node);
22 remove_extent_mapping(em_tree, em);
23
24#ifdef CONFIG_BTRFS_DEBUG
25 if (refcount_read(&em->refs) != 1) {
26 test_err(
27"em leak: em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx) refs %d",
28 em->start, em->len, em->block_start,
29 em->block_len, refcount_read(&em->refs));
30
31 refcount_set(&em->refs, 1);
32 }
33#endif
34 free_extent_map(em);
35 }
36 write_unlock(&em_tree->lock);
37}
38
39/*
40 * Test scenario:
41 *
42 * Suppose that no extent map has been loaded into memory yet, there is a file
43 * extent [0, 16K), followed by another file extent [16K, 20K), two dio reads
44 * are entering btrfs_get_extent() concurrently, t1 is reading [8K, 16K), t2 is
45 * reading [0, 8K)
46 *
47 * t1 t2
48 * btrfs_get_extent() btrfs_get_extent()
49 * -> lookup_extent_mapping() ->lookup_extent_mapping()
50 * -> add_extent_mapping(0, 16K)
51 * -> return em
52 * ->add_extent_mapping(0, 16K)
53 * -> #handle -EEXIST
54 */
55static int test_case_1(struct btrfs_fs_info *fs_info,
56 struct extent_map_tree *em_tree)
57{
58 struct extent_map *em;
59 u64 start = 0;
60 u64 len = SZ_8K;
61 int ret;
62
63 em = alloc_extent_map();
64 if (!em) {
65 test_std_err(TEST_ALLOC_EXTENT_MAP);
66 return -ENOMEM;
67 }
68
69 /* Add [0, 16K) */
70 em->start = 0;
71 em->len = SZ_16K;
72 em->block_start = 0;
73 em->block_len = SZ_16K;
74 write_lock(&em_tree->lock);
75 ret = add_extent_mapping(em_tree, em, 0);
76 write_unlock(&em_tree->lock);
77 if (ret < 0) {
78 test_err("cannot add extent range [0, 16K)");
79 goto out;
80 }
81 free_extent_map(em);
82
83 /* Add [16K, 20K) following [0, 16K) */
84 em = alloc_extent_map();
85 if (!em) {
86 test_std_err(TEST_ALLOC_EXTENT_MAP);
87 ret = -ENOMEM;
88 goto out;
89 }
90
91 em->start = SZ_16K;
92 em->len = SZ_4K;
93 em->block_start = SZ_32K; /* avoid merging */
94 em->block_len = SZ_4K;
95 write_lock(&em_tree->lock);
96 ret = add_extent_mapping(em_tree, em, 0);
97 write_unlock(&em_tree->lock);
98 if (ret < 0) {
99 test_err("cannot add extent range [16K, 20K)");
100 goto out;
101 }
102 free_extent_map(em);
103
104 em = alloc_extent_map();
105 if (!em) {
106 test_std_err(TEST_ALLOC_EXTENT_MAP);
107 ret = -ENOMEM;
108 goto out;
109 }
110
111 /* Add [0, 8K), should return [0, 16K) instead. */
112 em->start = start;
113 em->len = len;
114 em->block_start = start;
115 em->block_len = len;
116 write_lock(&em_tree->lock);
117 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
118 write_unlock(&em_tree->lock);
119 if (ret) {
120 test_err("case1 [%llu %llu]: ret %d", start, start + len, ret);
121 goto out;
122 }
123 if (em &&
124 (em->start != 0 || extent_map_end(em) != SZ_16K ||
125 em->block_start != 0 || em->block_len != SZ_16K)) {
126 test_err(
127"case1 [%llu %llu]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
128 start, start + len, ret, em->start, em->len,
129 em->block_start, em->block_len);
130 ret = -EINVAL;
131 }
132 free_extent_map(em);
133out:
134 free_extent_map_tree(em_tree);
135
136 return ret;
137}
138
139/*
140 * Test scenario:
141 *
142 * Reading the inline ending up with EEXIST, ie. read an inline
143 * extent and discard page cache and read it again.
144 */
145static int test_case_2(struct btrfs_fs_info *fs_info,
146 struct extent_map_tree *em_tree)
147{
148 struct extent_map *em;
149 int ret;
150
151 em = alloc_extent_map();
152 if (!em) {
153 test_std_err(TEST_ALLOC_EXTENT_MAP);
154 return -ENOMEM;
155 }
156
157 /* Add [0, 1K) */
158 em->start = 0;
159 em->len = SZ_1K;
160 em->block_start = EXTENT_MAP_INLINE;
161 em->block_len = (u64)-1;
162 write_lock(&em_tree->lock);
163 ret = add_extent_mapping(em_tree, em, 0);
164 write_unlock(&em_tree->lock);
165 if (ret < 0) {
166 test_err("cannot add extent range [0, 1K)");
167 goto out;
168 }
169 free_extent_map(em);
170
171 /* Add [4K, 8K) following [0, 1K) */
172 em = alloc_extent_map();
173 if (!em) {
174 test_std_err(TEST_ALLOC_EXTENT_MAP);
175 ret = -ENOMEM;
176 goto out;
177 }
178
179 em->start = SZ_4K;
180 em->len = SZ_4K;
181 em->block_start = SZ_4K;
182 em->block_len = SZ_4K;
183 write_lock(&em_tree->lock);
184 ret = add_extent_mapping(em_tree, em, 0);
185 write_unlock(&em_tree->lock);
186 if (ret < 0) {
187 test_err("cannot add extent range [4K, 8K)");
188 goto out;
189 }
190 free_extent_map(em);
191
192 em = alloc_extent_map();
193 if (!em) {
194 test_std_err(TEST_ALLOC_EXTENT_MAP);
195 ret = -ENOMEM;
196 goto out;
197 }
198
199 /* Add [0, 1K) */
200 em->start = 0;
201 em->len = SZ_1K;
202 em->block_start = EXTENT_MAP_INLINE;
203 em->block_len = (u64)-1;
204 write_lock(&em_tree->lock);
205 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
206 write_unlock(&em_tree->lock);
207 if (ret) {
208 test_err("case2 [0 1K]: ret %d", ret);
209 goto out;
210 }
211 if (em &&
212 (em->start != 0 || extent_map_end(em) != SZ_1K ||
213 em->block_start != EXTENT_MAP_INLINE || em->block_len != (u64)-1)) {
214 test_err(
215"case2 [0 1K]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
216 ret, em->start, em->len, em->block_start,
217 em->block_len);
218 ret = -EINVAL;
219 }
220 free_extent_map(em);
221out:
222 free_extent_map_tree(em_tree);
223
224 return ret;
225}
226
227static int __test_case_3(struct btrfs_fs_info *fs_info,
228 struct extent_map_tree *em_tree, u64 start)
229{
230 struct extent_map *em;
231 u64 len = SZ_4K;
232 int ret;
233
234 em = alloc_extent_map();
235 if (!em) {
236 test_std_err(TEST_ALLOC_EXTENT_MAP);
237 return -ENOMEM;
238 }
239
240 /* Add [4K, 8K) */
241 em->start = SZ_4K;
242 em->len = SZ_4K;
243 em->block_start = SZ_4K;
244 em->block_len = SZ_4K;
245 write_lock(&em_tree->lock);
246 ret = add_extent_mapping(em_tree, em, 0);
247 write_unlock(&em_tree->lock);
248 if (ret < 0) {
249 test_err("cannot add extent range [4K, 8K)");
250 goto out;
251 }
252 free_extent_map(em);
253
254 em = alloc_extent_map();
255 if (!em) {
256 test_std_err(TEST_ALLOC_EXTENT_MAP);
257 ret = -ENOMEM;
258 goto out;
259 }
260
261 /* Add [0, 16K) */
262 em->start = 0;
263 em->len = SZ_16K;
264 em->block_start = 0;
265 em->block_len = SZ_16K;
266 write_lock(&em_tree->lock);
267 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
268 write_unlock(&em_tree->lock);
269 if (ret) {
270 test_err("case3 [0x%llx 0x%llx): ret %d",
271 start, start + len, ret);
272 goto out;
273 }
274 /*
275 * Since bytes within em are contiguous, em->block_start is identical to
276 * em->start.
277 */
278 if (em &&
279 (start < em->start || start + len > extent_map_end(em) ||
280 em->start != em->block_start || em->len != em->block_len)) {
281 test_err(
282"case3 [0x%llx 0x%llx): ret %d em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx)",
283 start, start + len, ret, em->start, em->len,
284 em->block_start, em->block_len);
285 ret = -EINVAL;
286 }
287 free_extent_map(em);
288out:
289 free_extent_map_tree(em_tree);
290
291 return ret;
292}
293
294/*
295 * Test scenario:
296 *
297 * Suppose that no extent map has been loaded into memory yet.
298 * There is a file extent [0, 16K), two jobs are running concurrently
299 * against it, t1 is buffered writing to [4K, 8K) and t2 is doing dio
300 * read from [0, 4K) or [8K, 12K) or [12K, 16K).
301 *
302 * t1 goes ahead of t2 and adds em [4K, 8K) into tree.
303 *
304 * t1 t2
305 * cow_file_range() btrfs_get_extent()
306 * -> lookup_extent_mapping()
307 * -> add_extent_mapping()
308 * -> add_extent_mapping()
309 */
310static int test_case_3(struct btrfs_fs_info *fs_info,
311 struct extent_map_tree *em_tree)
312{
313 int ret;
314
315 ret = __test_case_3(fs_info, em_tree, 0);
316 if (ret)
317 return ret;
318 ret = __test_case_3(fs_info, em_tree, SZ_8K);
319 if (ret)
320 return ret;
321 ret = __test_case_3(fs_info, em_tree, (12 * SZ_1K));
322
323 return ret;
324}
325
326static int __test_case_4(struct btrfs_fs_info *fs_info,
327 struct extent_map_tree *em_tree, u64 start)
328{
329 struct extent_map *em;
330 u64 len = SZ_4K;
331 int ret;
332
333 em = alloc_extent_map();
334 if (!em) {
335 test_std_err(TEST_ALLOC_EXTENT_MAP);
336 return -ENOMEM;
337 }
338
339 /* Add [0K, 8K) */
340 em->start = 0;
341 em->len = SZ_8K;
342 em->block_start = 0;
343 em->block_len = SZ_8K;
344 write_lock(&em_tree->lock);
345 ret = add_extent_mapping(em_tree, em, 0);
346 write_unlock(&em_tree->lock);
347 if (ret < 0) {
348 test_err("cannot add extent range [0, 8K)");
349 goto out;
350 }
351 free_extent_map(em);
352
353 em = alloc_extent_map();
354 if (!em) {
355 test_std_err(TEST_ALLOC_EXTENT_MAP);
356 ret = -ENOMEM;
357 goto out;
358 }
359
360 /* Add [8K, 32K) */
361 em->start = SZ_8K;
362 em->len = 24 * SZ_1K;
363 em->block_start = SZ_16K; /* avoid merging */
364 em->block_len = 24 * SZ_1K;
365 write_lock(&em_tree->lock);
366 ret = add_extent_mapping(em_tree, em, 0);
367 write_unlock(&em_tree->lock);
368 if (ret < 0) {
369 test_err("cannot add extent range [8K, 32K)");
370 goto out;
371 }
372 free_extent_map(em);
373
374 em = alloc_extent_map();
375 if (!em) {
376 test_std_err(TEST_ALLOC_EXTENT_MAP);
377 ret = -ENOMEM;
378 goto out;
379 }
380 /* Add [0K, 32K) */
381 em->start = 0;
382 em->len = SZ_32K;
383 em->block_start = 0;
384 em->block_len = SZ_32K;
385 write_lock(&em_tree->lock);
386 ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
387 write_unlock(&em_tree->lock);
388 if (ret) {
389 test_err("case4 [0x%llx 0x%llx): ret %d",
390 start, len, ret);
391 goto out;
392 }
393 if (em && (start < em->start || start + len > extent_map_end(em))) {
394 test_err(
395"case4 [0x%llx 0x%llx): ret %d, added wrong em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx)",
396 start, len, ret, em->start, em->len, em->block_start,
397 em->block_len);
398 ret = -EINVAL;
399 }
400 free_extent_map(em);
401out:
402 free_extent_map_tree(em_tree);
403
404 return ret;
405}
406
407/*
408 * Test scenario:
409 *
410 * Suppose that no extent map has been loaded into memory yet.
411 * There is a file extent [0, 32K), two jobs are running concurrently
412 * against it, t1 is doing dio write to [8K, 32K) and t2 is doing dio
413 * read from [0, 4K) or [4K, 8K).
414 *
415 * t1 goes ahead of t2 and splits em [0, 32K) to em [0K, 8K) and [8K 32K).
416 *
417 * t1 t2
418 * btrfs_get_blocks_direct() btrfs_get_blocks_direct()
419 * -> btrfs_get_extent() -> btrfs_get_extent()
420 * -> lookup_extent_mapping()
421 * -> add_extent_mapping() -> lookup_extent_mapping()
422 * # load [0, 32K)
423 * -> btrfs_new_extent_direct()
424 * -> btrfs_drop_extent_cache()
425 * # split [0, 32K)
426 * -> add_extent_mapping()
427 * # add [8K, 32K)
428 * -> add_extent_mapping()
429 * # handle -EEXIST when adding
430 * # [0, 32K)
431 */
432static int test_case_4(struct btrfs_fs_info *fs_info,
433 struct extent_map_tree *em_tree)
434{
435 int ret;
436
437 ret = __test_case_4(fs_info, em_tree, 0);
438 if (ret)
439 return ret;
440 ret = __test_case_4(fs_info, em_tree, SZ_4K);
441
442 return ret;
443}
444
445struct rmap_test_vector {
446 u64 raid_type;
447 u64 physical_start;
448 u64 data_stripe_size;
449 u64 num_data_stripes;
450 u64 num_stripes;
451 /* Assume we won't have more than 5 physical stripes */
452 u64 data_stripe_phys_start[5];
453 bool expected_mapped_addr;
454 /* Physical to logical addresses */
455 u64 mapped_logical[5];
456};
457
458static int test_rmap_block(struct btrfs_fs_info *fs_info,
459 struct rmap_test_vector *test)
460{
461 struct extent_map *em;
462 struct map_lookup *map = NULL;
463 u64 *logical = NULL;
464 int i, out_ndaddrs, out_stripe_len;
465 int ret;
466
467 em = alloc_extent_map();
468 if (!em) {
469 test_std_err(TEST_ALLOC_EXTENT_MAP);
470 return -ENOMEM;
471 }
472
473 map = kmalloc(map_lookup_size(test->num_stripes), GFP_KERNEL);
474 if (!map) {
475 kfree(em);
476 test_std_err(TEST_ALLOC_EXTENT_MAP);
477 return -ENOMEM;
478 }
479
480 set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
481 /* Start at 4GiB logical address */
482 em->start = SZ_4G;
483 em->len = test->data_stripe_size * test->num_data_stripes;
484 em->block_len = em->len;
485 em->orig_block_len = test->data_stripe_size;
486 em->map_lookup = map;
487
488 map->num_stripes = test->num_stripes;
489 map->stripe_len = BTRFS_STRIPE_LEN;
490 map->type = test->raid_type;
491
492 for (i = 0; i < map->num_stripes; i++) {
493 struct btrfs_device *dev = btrfs_alloc_dummy_device(fs_info);
494
495 if (IS_ERR(dev)) {
496 test_err("cannot allocate device");
497 ret = PTR_ERR(dev);
498 goto out;
499 }
500 map->stripes[i].dev = dev;
501 map->stripes[i].physical = test->data_stripe_phys_start[i];
502 }
503
504 write_lock(&fs_info->mapping_tree.lock);
505 ret = add_extent_mapping(&fs_info->mapping_tree, em, 0);
506 write_unlock(&fs_info->mapping_tree.lock);
507 if (ret) {
508 test_err("error adding block group mapping to mapping tree");
509 goto out_free;
510 }
511
512 ret = btrfs_rmap_block(fs_info, em->start, NULL, btrfs_sb_offset(1),
513 &logical, &out_ndaddrs, &out_stripe_len);
514 if (ret || (out_ndaddrs == 0 && test->expected_mapped_addr)) {
515 test_err("didn't rmap anything but expected %d",
516 test->expected_mapped_addr);
517 goto out;
518 }
519
520 if (out_stripe_len != BTRFS_STRIPE_LEN) {
521 test_err("calculated stripe length doesn't match");
522 goto out;
523 }
524
525 if (out_ndaddrs != test->expected_mapped_addr) {
526 for (i = 0; i < out_ndaddrs; i++)
527 test_msg("mapped %llu", logical[i]);
528 test_err("unexpected number of mapped addresses: %d", out_ndaddrs);
529 goto out;
530 }
531
532 for (i = 0; i < out_ndaddrs; i++) {
533 if (logical[i] != test->mapped_logical[i]) {
534 test_err("unexpected logical address mapped");
535 goto out;
536 }
537 }
538
539 ret = 0;
540out:
541 write_lock(&fs_info->mapping_tree.lock);
542 remove_extent_mapping(&fs_info->mapping_tree, em);
543 write_unlock(&fs_info->mapping_tree.lock);
544 /* For us */
545 free_extent_map(em);
546out_free:
547 /* For the tree */
548 free_extent_map(em);
549 kfree(logical);
550 return ret;
551}
552
553int btrfs_test_extent_map(void)
554{
555 struct btrfs_fs_info *fs_info = NULL;
556 struct extent_map_tree *em_tree;
557 int ret = 0, i;
558 struct rmap_test_vector rmap_tests[] = {
559 {
560 /*
561 * Test a chunk with 2 data stripes one of which
562 * intersects the physical address of the super block
563 * is correctly recognised.
564 */
565 .raid_type = BTRFS_BLOCK_GROUP_RAID1,
566 .physical_start = SZ_64M - SZ_4M,
567 .data_stripe_size = SZ_256M,
568 .num_data_stripes = 2,
569 .num_stripes = 2,
570 .data_stripe_phys_start =
571 {SZ_64M - SZ_4M, SZ_64M - SZ_4M + SZ_256M},
572 .expected_mapped_addr = true,
573 .mapped_logical= {SZ_4G + SZ_4M}
574 },
575 {
576 /*
577 * Test that out-of-range physical addresses are
578 * ignored
579 */
580
581 /* SINGLE chunk type */
582 .raid_type = 0,
583 .physical_start = SZ_4G,
584 .data_stripe_size = SZ_256M,
585 .num_data_stripes = 1,
586 .num_stripes = 1,
587 .data_stripe_phys_start = {SZ_256M},
588 .expected_mapped_addr = false,
589 .mapped_logical = {0}
590 }
591 };
592
593 test_msg("running extent_map tests");
594
595 /*
596 * Note: the fs_info is not set up completely, we only need
597 * fs_info::fsid for the tracepoint.
598 */
599 fs_info = btrfs_alloc_dummy_fs_info(PAGE_SIZE, PAGE_SIZE);
600 if (!fs_info) {
601 test_std_err(TEST_ALLOC_FS_INFO);
602 return -ENOMEM;
603 }
604
605 em_tree = kzalloc(sizeof(*em_tree), GFP_KERNEL);
606 if (!em_tree) {
607 ret = -ENOMEM;
608 goto out;
609 }
610
611 extent_map_tree_init(em_tree);
612
613 ret = test_case_1(fs_info, em_tree);
614 if (ret)
615 goto out;
616 ret = test_case_2(fs_info, em_tree);
617 if (ret)
618 goto out;
619 ret = test_case_3(fs_info, em_tree);
620 if (ret)
621 goto out;
622 ret = test_case_4(fs_info, em_tree);
623
624 test_msg("running rmap tests");
625 for (i = 0; i < ARRAY_SIZE(rmap_tests); i++) {
626 ret = test_rmap_block(fs_info, &rmap_tests[i]);
627 if (ret)
628 goto out;
629 }
630
631out:
632 kfree(em_tree);
633 btrfs_free_dummy_fs_info(fs_info);
634
635 return ret;
636}