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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2013 Fusion IO. All rights reserved.
4 */
5
6#include <linux/pagemap.h>
7#include <linux/pagevec.h>
8#include <linux/sched.h>
9#include <linux/slab.h>
10#include <linux/sizes.h>
11#include "btrfs-tests.h"
12#include "../ctree.h"
13#include "../extent_io.h"
14#include "../btrfs_inode.h"
15
16#define PROCESS_UNLOCK (1 << 0)
17#define PROCESS_RELEASE (1 << 1)
18#define PROCESS_TEST_LOCKED (1 << 2)
19
20static noinline int process_page_range(struct inode *inode, u64 start, u64 end,
21 unsigned long flags)
22{
23 int ret;
24 struct folio_batch fbatch;
25 unsigned long index = start >> PAGE_SHIFT;
26 unsigned long end_index = end >> PAGE_SHIFT;
27 int i;
28 int count = 0;
29 int loops = 0;
30
31 folio_batch_init(&fbatch);
32
33 while (index <= end_index) {
34 ret = filemap_get_folios_contig(inode->i_mapping, &index,
35 end_index, &fbatch);
36 for (i = 0; i < ret; i++) {
37 struct folio *folio = fbatch.folios[i];
38
39 if (flags & PROCESS_TEST_LOCKED &&
40 !folio_test_locked(folio))
41 count++;
42 if (flags & PROCESS_UNLOCK && folio_test_locked(folio))
43 folio_unlock(folio);
44 if (flags & PROCESS_RELEASE)
45 folio_put(folio);
46 }
47 folio_batch_release(&fbatch);
48 cond_resched();
49 loops++;
50 if (loops > 100000) {
51 printk(KERN_ERR
52 "stuck in a loop, start %llu, end %llu, ret %d\n",
53 start, end, ret);
54 break;
55 }
56 }
57
58 return count;
59}
60
61#define STATE_FLAG_STR_LEN 256
62
63#define PRINT_ONE_FLAG(state, dest, cur, name) \
64({ \
65 if (state->state & EXTENT_##name) \
66 cur += scnprintf(dest + cur, STATE_FLAG_STR_LEN - cur, \
67 "%s" #name, cur == 0 ? "" : "|"); \
68})
69
70static void extent_flag_to_str(const struct extent_state *state, char *dest)
71{
72 int cur = 0;
73
74 dest[0] = 0;
75 PRINT_ONE_FLAG(state, dest, cur, DIRTY);
76 PRINT_ONE_FLAG(state, dest, cur, UPTODATE);
77 PRINT_ONE_FLAG(state, dest, cur, LOCKED);
78 PRINT_ONE_FLAG(state, dest, cur, NEW);
79 PRINT_ONE_FLAG(state, dest, cur, DELALLOC);
80 PRINT_ONE_FLAG(state, dest, cur, DEFRAG);
81 PRINT_ONE_FLAG(state, dest, cur, BOUNDARY);
82 PRINT_ONE_FLAG(state, dest, cur, NODATASUM);
83 PRINT_ONE_FLAG(state, dest, cur, CLEAR_META_RESV);
84 PRINT_ONE_FLAG(state, dest, cur, NEED_WAIT);
85 PRINT_ONE_FLAG(state, dest, cur, NORESERVE);
86 PRINT_ONE_FLAG(state, dest, cur, QGROUP_RESERVED);
87 PRINT_ONE_FLAG(state, dest, cur, CLEAR_DATA_RESV);
88}
89
90static void dump_extent_io_tree(const struct extent_io_tree *tree)
91{
92 struct rb_node *node;
93 char flags_str[STATE_FLAG_STR_LEN];
94
95 node = rb_first(&tree->state);
96 test_msg("io tree content:");
97 while (node) {
98 struct extent_state *state;
99
100 state = rb_entry(node, struct extent_state, rb_node);
101 extent_flag_to_str(state, flags_str);
102 test_msg(" start=%llu len=%llu flags=%s", state->start,
103 state->end + 1 - state->start, flags_str);
104 node = rb_next(node);
105 }
106}
107
108static int test_find_delalloc(u32 sectorsize)
109{
110 struct inode *inode;
111 struct extent_io_tree *tmp;
112 struct page *page;
113 struct page *locked_page = NULL;
114 unsigned long index = 0;
115 /* In this test we need at least 2 file extents at its maximum size */
116 u64 max_bytes = BTRFS_MAX_EXTENT_SIZE;
117 u64 total_dirty = 2 * max_bytes;
118 u64 start, end, test_start;
119 bool found;
120 int ret = -EINVAL;
121
122 test_msg("running find delalloc tests");
123
124 inode = btrfs_new_test_inode();
125 if (!inode) {
126 test_std_err(TEST_ALLOC_INODE);
127 return -ENOMEM;
128 }
129 tmp = &BTRFS_I(inode)->io_tree;
130
131 /*
132 * Passing NULL as we don't have fs_info but tracepoints are not used
133 * at this point
134 */
135 extent_io_tree_init(NULL, tmp, IO_TREE_SELFTEST);
136
137 /*
138 * First go through and create and mark all of our pages dirty, we pin
139 * everything to make sure our pages don't get evicted and screw up our
140 * test.
141 */
142 for (index = 0; index < (total_dirty >> PAGE_SHIFT); index++) {
143 page = find_or_create_page(inode->i_mapping, index, GFP_KERNEL);
144 if (!page) {
145 test_err("failed to allocate test page");
146 ret = -ENOMEM;
147 goto out;
148 }
149 SetPageDirty(page);
150 if (index) {
151 unlock_page(page);
152 } else {
153 get_page(page);
154 locked_page = page;
155 }
156 }
157
158 /* Test this scenario
159 * |--- delalloc ---|
160 * |--- search ---|
161 */
162 set_extent_bit(tmp, 0, sectorsize - 1, EXTENT_DELALLOC, NULL);
163 start = 0;
164 end = start + PAGE_SIZE - 1;
165 found = find_lock_delalloc_range(inode, locked_page, &start,
166 &end);
167 if (!found) {
168 test_err("should have found at least one delalloc");
169 goto out_bits;
170 }
171 if (start != 0 || end != (sectorsize - 1)) {
172 test_err("expected start 0 end %u, got start %llu end %llu",
173 sectorsize - 1, start, end);
174 goto out_bits;
175 }
176 unlock_extent(tmp, start, end, NULL);
177 unlock_page(locked_page);
178 put_page(locked_page);
179
180 /*
181 * Test this scenario
182 *
183 * |--- delalloc ---|
184 * |--- search ---|
185 */
186 test_start = SZ_64M;
187 locked_page = find_lock_page(inode->i_mapping,
188 test_start >> PAGE_SHIFT);
189 if (!locked_page) {
190 test_err("couldn't find the locked page");
191 goto out_bits;
192 }
193 set_extent_bit(tmp, sectorsize, max_bytes - 1, EXTENT_DELALLOC, NULL);
194 start = test_start;
195 end = start + PAGE_SIZE - 1;
196 found = find_lock_delalloc_range(inode, locked_page, &start,
197 &end);
198 if (!found) {
199 test_err("couldn't find delalloc in our range");
200 goto out_bits;
201 }
202 if (start != test_start || end != max_bytes - 1) {
203 test_err("expected start %llu end %llu, got start %llu, end %llu",
204 test_start, max_bytes - 1, start, end);
205 goto out_bits;
206 }
207 if (process_page_range(inode, start, end,
208 PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
209 test_err("there were unlocked pages in the range");
210 goto out_bits;
211 }
212 unlock_extent(tmp, start, end, NULL);
213 /* locked_page was unlocked above */
214 put_page(locked_page);
215
216 /*
217 * Test this scenario
218 * |--- delalloc ---|
219 * |--- search ---|
220 */
221 test_start = max_bytes + sectorsize;
222 locked_page = find_lock_page(inode->i_mapping, test_start >>
223 PAGE_SHIFT);
224 if (!locked_page) {
225 test_err("couldn't find the locked page");
226 goto out_bits;
227 }
228 start = test_start;
229 end = start + PAGE_SIZE - 1;
230 found = find_lock_delalloc_range(inode, locked_page, &start,
231 &end);
232 if (found) {
233 test_err("found range when we shouldn't have");
234 goto out_bits;
235 }
236 if (end != test_start + PAGE_SIZE - 1) {
237 test_err("did not return the proper end offset");
238 goto out_bits;
239 }
240
241 /*
242 * Test this scenario
243 * [------- delalloc -------|
244 * [max_bytes]|-- search--|
245 *
246 * We are re-using our test_start from above since it works out well.
247 */
248 set_extent_bit(tmp, max_bytes, total_dirty - 1, EXTENT_DELALLOC, NULL);
249 start = test_start;
250 end = start + PAGE_SIZE - 1;
251 found = find_lock_delalloc_range(inode, locked_page, &start,
252 &end);
253 if (!found) {
254 test_err("didn't find our range");
255 goto out_bits;
256 }
257 if (start != test_start || end != total_dirty - 1) {
258 test_err("expected start %llu end %llu, got start %llu end %llu",
259 test_start, total_dirty - 1, start, end);
260 goto out_bits;
261 }
262 if (process_page_range(inode, start, end,
263 PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
264 test_err("pages in range were not all locked");
265 goto out_bits;
266 }
267 unlock_extent(tmp, start, end, NULL);
268
269 /*
270 * Now to test where we run into a page that is no longer dirty in the
271 * range we want to find.
272 */
273 page = find_get_page(inode->i_mapping,
274 (max_bytes + SZ_1M) >> PAGE_SHIFT);
275 if (!page) {
276 test_err("couldn't find our page");
277 goto out_bits;
278 }
279 ClearPageDirty(page);
280 put_page(page);
281
282 /* We unlocked it in the previous test */
283 lock_page(locked_page);
284 start = test_start;
285 end = start + PAGE_SIZE - 1;
286 /*
287 * Currently if we fail to find dirty pages in the delalloc range we
288 * will adjust max_bytes down to PAGE_SIZE and then re-search. If
289 * this changes at any point in the future we will need to fix this
290 * tests expected behavior.
291 */
292 found = find_lock_delalloc_range(inode, locked_page, &start,
293 &end);
294 if (!found) {
295 test_err("didn't find our range");
296 goto out_bits;
297 }
298 if (start != test_start && end != test_start + PAGE_SIZE - 1) {
299 test_err("expected start %llu end %llu, got start %llu end %llu",
300 test_start, test_start + PAGE_SIZE - 1, start, end);
301 goto out_bits;
302 }
303 if (process_page_range(inode, start, end, PROCESS_TEST_LOCKED |
304 PROCESS_UNLOCK)) {
305 test_err("pages in range were not all locked");
306 goto out_bits;
307 }
308 ret = 0;
309out_bits:
310 if (ret)
311 dump_extent_io_tree(tmp);
312 clear_extent_bits(tmp, 0, total_dirty - 1, (unsigned)-1);
313out:
314 if (locked_page)
315 put_page(locked_page);
316 process_page_range(inode, 0, total_dirty - 1,
317 PROCESS_UNLOCK | PROCESS_RELEASE);
318 iput(inode);
319 return ret;
320}
321
322static int check_eb_bitmap(unsigned long *bitmap, struct extent_buffer *eb)
323{
324 unsigned long i;
325
326 for (i = 0; i < eb->len * BITS_PER_BYTE; i++) {
327 int bit, bit1;
328
329 bit = !!test_bit(i, bitmap);
330 bit1 = !!extent_buffer_test_bit(eb, 0, i);
331 if (bit1 != bit) {
332 u8 has;
333 u8 expect;
334
335 read_extent_buffer(eb, &has, i / BITS_PER_BYTE, 1);
336 expect = bitmap_get_value8(bitmap, ALIGN(i, BITS_PER_BYTE));
337
338 test_err(
339 "bits do not match, start byte 0 bit %lu, byte %lu has 0x%02x expect 0x%02x",
340 i, i / BITS_PER_BYTE, has, expect);
341 return -EINVAL;
342 }
343
344 bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
345 i % BITS_PER_BYTE);
346 if (bit1 != bit) {
347 u8 has;
348 u8 expect;
349
350 read_extent_buffer(eb, &has, i / BITS_PER_BYTE, 1);
351 expect = bitmap_get_value8(bitmap, ALIGN(i, BITS_PER_BYTE));
352
353 test_err(
354 "bits do not match, start byte %lu bit %lu, byte %lu has 0x%02x expect 0x%02x",
355 i / BITS_PER_BYTE, i % BITS_PER_BYTE,
356 i / BITS_PER_BYTE, has, expect);
357 return -EINVAL;
358 }
359 }
360 return 0;
361}
362
363static int test_bitmap_set(const char *name, unsigned long *bitmap,
364 struct extent_buffer *eb,
365 unsigned long byte_start, unsigned long bit_start,
366 unsigned long bit_len)
367{
368 int ret;
369
370 bitmap_set(bitmap, byte_start * BITS_PER_BYTE + bit_start, bit_len);
371 extent_buffer_bitmap_set(eb, byte_start, bit_start, bit_len);
372 ret = check_eb_bitmap(bitmap, eb);
373 if (ret < 0)
374 test_err("%s test failed", name);
375 return ret;
376}
377
378static int test_bitmap_clear(const char *name, unsigned long *bitmap,
379 struct extent_buffer *eb,
380 unsigned long byte_start, unsigned long bit_start,
381 unsigned long bit_len)
382{
383 int ret;
384
385 bitmap_clear(bitmap, byte_start * BITS_PER_BYTE + bit_start, bit_len);
386 extent_buffer_bitmap_clear(eb, byte_start, bit_start, bit_len);
387 ret = check_eb_bitmap(bitmap, eb);
388 if (ret < 0)
389 test_err("%s test failed", name);
390 return ret;
391}
392static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb)
393{
394 unsigned long i, j;
395 unsigned long byte_len = eb->len;
396 u32 x;
397 int ret;
398
399 ret = test_bitmap_clear("clear all run 1", bitmap, eb, 0, 0,
400 byte_len * BITS_PER_BYTE);
401 if (ret < 0)
402 return ret;
403
404 ret = test_bitmap_set("set all", bitmap, eb, 0, 0, byte_len * BITS_PER_BYTE);
405 if (ret < 0)
406 return ret;
407
408 ret = test_bitmap_clear("clear all run 2", bitmap, eb, 0, 0,
409 byte_len * BITS_PER_BYTE);
410 if (ret < 0)
411 return ret;
412
413 ret = test_bitmap_set("same byte set", bitmap, eb, 0, 2, 4);
414 if (ret < 0)
415 return ret;
416
417 ret = test_bitmap_clear("same byte partial clear", bitmap, eb, 0, 4, 1);
418 if (ret < 0)
419 return ret;
420
421 ret = test_bitmap_set("cross byte set", bitmap, eb, 2, 4, 8);
422 if (ret < 0)
423 return ret;
424
425 ret = test_bitmap_set("cross multi byte set", bitmap, eb, 4, 4, 24);
426 if (ret < 0)
427 return ret;
428
429 ret = test_bitmap_clear("cross byte clear", bitmap, eb, 2, 6, 4);
430 if (ret < 0)
431 return ret;
432
433 ret = test_bitmap_clear("cross multi byte clear", bitmap, eb, 4, 6, 20);
434 if (ret < 0)
435 return ret;
436
437 /* Straddling pages test */
438 if (byte_len > PAGE_SIZE) {
439 ret = test_bitmap_set("cross page set", bitmap, eb,
440 PAGE_SIZE - sizeof(long) / 2, 0,
441 sizeof(long) * BITS_PER_BYTE);
442 if (ret < 0)
443 return ret;
444
445 ret = test_bitmap_set("cross page set all", bitmap, eb, 0, 0,
446 byte_len * BITS_PER_BYTE);
447 if (ret < 0)
448 return ret;
449
450 ret = test_bitmap_clear("cross page clear", bitmap, eb,
451 PAGE_SIZE - sizeof(long) / 2, 0,
452 sizeof(long) * BITS_PER_BYTE);
453 if (ret < 0)
454 return ret;
455 }
456
457 /*
458 * Generate a wonky pseudo-random bit pattern for the sake of not using
459 * something repetitive that could miss some hypothetical off-by-n bug.
460 */
461 x = 0;
462 ret = test_bitmap_clear("clear all run 3", bitmap, eb, 0, 0,
463 byte_len * BITS_PER_BYTE);
464 if (ret < 0)
465 return ret;
466
467 for (i = 0; i < byte_len * BITS_PER_BYTE / 32; i++) {
468 x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffU;
469 for (j = 0; j < 32; j++) {
470 if (x & (1U << j)) {
471 bitmap_set(bitmap, i * 32 + j, 1);
472 extent_buffer_bitmap_set(eb, 0, i * 32 + j, 1);
473 }
474 }
475 }
476
477 ret = check_eb_bitmap(bitmap, eb);
478 if (ret) {
479 test_err("random bit pattern failed");
480 return ret;
481 }
482
483 return 0;
484}
485
486static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
487{
488 struct btrfs_fs_info *fs_info;
489 unsigned long *bitmap = NULL;
490 struct extent_buffer *eb = NULL;
491 int ret;
492
493 test_msg("running extent buffer bitmap tests");
494
495 fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
496 if (!fs_info) {
497 test_std_err(TEST_ALLOC_FS_INFO);
498 return -ENOMEM;
499 }
500
501 bitmap = kmalloc(nodesize, GFP_KERNEL);
502 if (!bitmap) {
503 test_err("couldn't allocate test bitmap");
504 ret = -ENOMEM;
505 goto out;
506 }
507
508 eb = __alloc_dummy_extent_buffer(fs_info, 0, nodesize);
509 if (!eb) {
510 test_std_err(TEST_ALLOC_ROOT);
511 ret = -ENOMEM;
512 goto out;
513 }
514
515 ret = __test_eb_bitmaps(bitmap, eb);
516 if (ret)
517 goto out;
518
519 free_extent_buffer(eb);
520
521 /*
522 * Test again for case where the tree block is sectorsize aligned but
523 * not nodesize aligned.
524 */
525 eb = __alloc_dummy_extent_buffer(fs_info, sectorsize, nodesize);
526 if (!eb) {
527 test_std_err(TEST_ALLOC_ROOT);
528 ret = -ENOMEM;
529 goto out;
530 }
531
532 ret = __test_eb_bitmaps(bitmap, eb);
533out:
534 free_extent_buffer(eb);
535 kfree(bitmap);
536 btrfs_free_dummy_fs_info(fs_info);
537 return ret;
538}
539
540static int test_find_first_clear_extent_bit(void)
541{
542 struct extent_io_tree tree;
543 u64 start, end;
544 int ret = -EINVAL;
545
546 test_msg("running find_first_clear_extent_bit test");
547
548 extent_io_tree_init(NULL, &tree, IO_TREE_SELFTEST);
549
550 /* Test correct handling of empty tree */
551 find_first_clear_extent_bit(&tree, 0, &start, &end, CHUNK_TRIMMED);
552 if (start != 0 || end != -1) {
553 test_err(
554 "error getting a range from completely empty tree: start %llu end %llu",
555 start, end);
556 goto out;
557 }
558 /*
559 * Set 1M-4M alloc/discard and 32M-64M thus leaving a hole between
560 * 4M-32M
561 */
562 set_extent_bit(&tree, SZ_1M, SZ_4M - 1,
563 CHUNK_TRIMMED | CHUNK_ALLOCATED, NULL);
564
565 find_first_clear_extent_bit(&tree, SZ_512K, &start, &end,
566 CHUNK_TRIMMED | CHUNK_ALLOCATED);
567
568 if (start != 0 || end != SZ_1M - 1) {
569 test_err("error finding beginning range: start %llu end %llu",
570 start, end);
571 goto out;
572 }
573
574 /* Now add 32M-64M so that we have a hole between 4M-32M */
575 set_extent_bit(&tree, SZ_32M, SZ_64M - 1,
576 CHUNK_TRIMMED | CHUNK_ALLOCATED, NULL);
577
578 /*
579 * Request first hole starting at 12M, we should get 4M-32M
580 */
581 find_first_clear_extent_bit(&tree, 12 * SZ_1M, &start, &end,
582 CHUNK_TRIMMED | CHUNK_ALLOCATED);
583
584 if (start != SZ_4M || end != SZ_32M - 1) {
585 test_err("error finding trimmed range: start %llu end %llu",
586 start, end);
587 goto out;
588 }
589
590 /*
591 * Search in the middle of allocated range, should get the next one
592 * available, which happens to be unallocated -> 4M-32M
593 */
594 find_first_clear_extent_bit(&tree, SZ_2M, &start, &end,
595 CHUNK_TRIMMED | CHUNK_ALLOCATED);
596
597 if (start != SZ_4M || end != SZ_32M - 1) {
598 test_err("error finding next unalloc range: start %llu end %llu",
599 start, end);
600 goto out;
601 }
602
603 /*
604 * Set 64M-72M with CHUNK_ALLOC flag, then search for CHUNK_TRIMMED flag
605 * being unset in this range, we should get the entry in range 64M-72M
606 */
607 set_extent_bit(&tree, SZ_64M, SZ_64M + SZ_8M - 1, CHUNK_ALLOCATED, NULL);
608 find_first_clear_extent_bit(&tree, SZ_64M + SZ_1M, &start, &end,
609 CHUNK_TRIMMED);
610
611 if (start != SZ_64M || end != SZ_64M + SZ_8M - 1) {
612 test_err("error finding exact range: start %llu end %llu",
613 start, end);
614 goto out;
615 }
616
617 find_first_clear_extent_bit(&tree, SZ_64M - SZ_8M, &start, &end,
618 CHUNK_TRIMMED);
619
620 /*
621 * Search in the middle of set range whose immediate neighbour doesn't
622 * have the bits set so it must be returned
623 */
624 if (start != SZ_64M || end != SZ_64M + SZ_8M - 1) {
625 test_err("error finding next alloc range: start %llu end %llu",
626 start, end);
627 goto out;
628 }
629
630 /*
631 * Search beyond any known range, shall return after last known range
632 * and end should be -1
633 */
634 find_first_clear_extent_bit(&tree, -1, &start, &end, CHUNK_TRIMMED);
635 if (start != SZ_64M + SZ_8M || end != -1) {
636 test_err(
637 "error handling beyond end of range search: start %llu end %llu",
638 start, end);
639 goto out;
640 }
641
642 ret = 0;
643out:
644 if (ret)
645 dump_extent_io_tree(&tree);
646 clear_extent_bits(&tree, 0, (u64)-1, CHUNK_TRIMMED | CHUNK_ALLOCATED);
647
648 return ret;
649}
650
651static void dump_eb_and_memory_contents(struct extent_buffer *eb, void *memory,
652 const char *test_name)
653{
654 for (int i = 0; i < eb->len; i++) {
655 struct page *page = folio_page(eb->folios[i >> PAGE_SHIFT], 0);
656 void *addr = page_address(page) + offset_in_page(i);
657
658 if (memcmp(addr, memory + i, 1) != 0) {
659 test_err("%s failed", test_name);
660 test_err("eb and memory diffs at byte %u, eb has 0x%02x memory has 0x%02x",
661 i, *(u8 *)addr, *(u8 *)(memory + i));
662 return;
663 }
664 }
665}
666
667static int verify_eb_and_memory(struct extent_buffer *eb, void *memory,
668 const char *test_name)
669{
670 for (int i = 0; i < (eb->len >> PAGE_SHIFT); i++) {
671 void *eb_addr = folio_address(eb->folios[i]);
672
673 if (memcmp(memory + (i << PAGE_SHIFT), eb_addr, PAGE_SIZE) != 0) {
674 dump_eb_and_memory_contents(eb, memory, test_name);
675 return -EUCLEAN;
676 }
677 }
678 return 0;
679}
680
681/*
682 * Init both memory and extent buffer contents to the same randomly generated
683 * contents.
684 */
685static void init_eb_and_memory(struct extent_buffer *eb, void *memory)
686{
687 get_random_bytes(memory, eb->len);
688 write_extent_buffer(eb, memory, 0, eb->len);
689}
690
691static int test_eb_mem_ops(u32 sectorsize, u32 nodesize)
692{
693 struct btrfs_fs_info *fs_info;
694 struct extent_buffer *eb = NULL;
695 void *memory = NULL;
696 int ret;
697
698 test_msg("running extent buffer memory operation tests");
699
700 fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
701 if (!fs_info) {
702 test_std_err(TEST_ALLOC_FS_INFO);
703 return -ENOMEM;
704 }
705
706 memory = kvzalloc(nodesize, GFP_KERNEL);
707 if (!memory) {
708 test_err("failed to allocate memory");
709 ret = -ENOMEM;
710 goto out;
711 }
712
713 eb = __alloc_dummy_extent_buffer(fs_info, SZ_1M, nodesize);
714 if (!eb) {
715 test_std_err(TEST_ALLOC_EXTENT_BUFFER);
716 ret = -ENOMEM;
717 goto out;
718 }
719
720 init_eb_and_memory(eb, memory);
721 ret = verify_eb_and_memory(eb, memory, "full eb write");
722 if (ret < 0)
723 goto out;
724
725 memcpy(memory, memory + 16, 16);
726 memcpy_extent_buffer(eb, 0, 16, 16);
727 ret = verify_eb_and_memory(eb, memory, "same page non-overlapping memcpy 1");
728 if (ret < 0)
729 goto out;
730
731 memcpy(memory, memory + 2048, 16);
732 memcpy_extent_buffer(eb, 0, 2048, 16);
733 ret = verify_eb_and_memory(eb, memory, "same page non-overlapping memcpy 2");
734 if (ret < 0)
735 goto out;
736 memcpy(memory, memory + 2048, 2048);
737 memcpy_extent_buffer(eb, 0, 2048, 2048);
738 ret = verify_eb_and_memory(eb, memory, "same page non-overlapping memcpy 3");
739 if (ret < 0)
740 goto out;
741
742 memmove(memory + 512, memory + 256, 512);
743 memmove_extent_buffer(eb, 512, 256, 512);
744 ret = verify_eb_and_memory(eb, memory, "same page overlapping memcpy 1");
745 if (ret < 0)
746 goto out;
747
748 memmove(memory + 2048, memory + 512, 2048);
749 memmove_extent_buffer(eb, 2048, 512, 2048);
750 ret = verify_eb_and_memory(eb, memory, "same page overlapping memcpy 2");
751 if (ret < 0)
752 goto out;
753 memmove(memory + 512, memory + 2048, 2048);
754 memmove_extent_buffer(eb, 512, 2048, 2048);
755 ret = verify_eb_and_memory(eb, memory, "same page overlapping memcpy 3");
756 if (ret < 0)
757 goto out;
758
759 if (nodesize > PAGE_SIZE) {
760 memcpy(memory, memory + 4096 - 128, 256);
761 memcpy_extent_buffer(eb, 0, 4096 - 128, 256);
762 ret = verify_eb_and_memory(eb, memory, "cross page non-overlapping memcpy 1");
763 if (ret < 0)
764 goto out;
765
766 memcpy(memory + 4096 - 128, memory + 4096 + 128, 256);
767 memcpy_extent_buffer(eb, 4096 - 128, 4096 + 128, 256);
768 ret = verify_eb_and_memory(eb, memory, "cross page non-overlapping memcpy 2");
769 if (ret < 0)
770 goto out;
771
772 memmove(memory + 4096 - 128, memory + 4096 - 64, 256);
773 memmove_extent_buffer(eb, 4096 - 128, 4096 - 64, 256);
774 ret = verify_eb_and_memory(eb, memory, "cross page overlapping memcpy 1");
775 if (ret < 0)
776 goto out;
777
778 memmove(memory + 4096 - 64, memory + 4096 - 128, 256);
779 memmove_extent_buffer(eb, 4096 - 64, 4096 - 128, 256);
780 ret = verify_eb_and_memory(eb, memory, "cross page overlapping memcpy 2");
781 if (ret < 0)
782 goto out;
783 }
784out:
785 free_extent_buffer(eb);
786 kvfree(memory);
787 btrfs_free_dummy_fs_info(fs_info);
788 return ret;
789}
790
791int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
792{
793 int ret;
794
795 test_msg("running extent I/O tests");
796
797 ret = test_find_delalloc(sectorsize);
798 if (ret)
799 goto out;
800
801 ret = test_find_first_clear_extent_bit();
802 if (ret)
803 goto out;
804
805 ret = test_eb_bitmaps(sectorsize, nodesize);
806 if (ret)
807 goto out;
808
809 ret = test_eb_mem_ops(sectorsize, nodesize);
810out:
811 return ret;
812}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2013 Fusion IO. All rights reserved.
4 */
5
6#include <linux/pagemap.h>
7#include <linux/sched.h>
8#include <linux/slab.h>
9#include <linux/sizes.h>
10#include "btrfs-tests.h"
11#include "../ctree.h"
12#include "../extent_io.h"
13
14#define PROCESS_UNLOCK (1 << 0)
15#define PROCESS_RELEASE (1 << 1)
16#define PROCESS_TEST_LOCKED (1 << 2)
17
18static noinline int process_page_range(struct inode *inode, u64 start, u64 end,
19 unsigned long flags)
20{
21 int ret;
22 struct page *pages[16];
23 unsigned long index = start >> PAGE_SHIFT;
24 unsigned long end_index = end >> PAGE_SHIFT;
25 unsigned long nr_pages = end_index - index + 1;
26 int i;
27 int count = 0;
28 int loops = 0;
29
30 while (nr_pages > 0) {
31 ret = find_get_pages_contig(inode->i_mapping, index,
32 min_t(unsigned long, nr_pages,
33 ARRAY_SIZE(pages)), pages);
34 for (i = 0; i < ret; i++) {
35 if (flags & PROCESS_TEST_LOCKED &&
36 !PageLocked(pages[i]))
37 count++;
38 if (flags & PROCESS_UNLOCK && PageLocked(pages[i]))
39 unlock_page(pages[i]);
40 put_page(pages[i]);
41 if (flags & PROCESS_RELEASE)
42 put_page(pages[i]);
43 }
44 nr_pages -= ret;
45 index += ret;
46 cond_resched();
47 loops++;
48 if (loops > 100000) {
49 printk(KERN_ERR "stuck in a loop, start %Lu, end %Lu, nr_pages %lu, ret %d\n", start, end, nr_pages, ret);
50 break;
51 }
52 }
53 return count;
54}
55
56static int test_find_delalloc(u32 sectorsize)
57{
58 struct inode *inode;
59 struct extent_io_tree tmp;
60 struct page *page;
61 struct page *locked_page = NULL;
62 unsigned long index = 0;
63 u64 total_dirty = SZ_256M;
64 u64 max_bytes = SZ_128M;
65 u64 start, end, test_start;
66 u64 found;
67 int ret = -EINVAL;
68
69 test_msg("Running find delalloc tests\n");
70
71 inode = btrfs_new_test_inode();
72 if (!inode) {
73 test_msg("Failed to allocate test inode\n");
74 return -ENOMEM;
75 }
76
77 extent_io_tree_init(&tmp, inode);
78
79 /*
80 * First go through and create and mark all of our pages dirty, we pin
81 * everything to make sure our pages don't get evicted and screw up our
82 * test.
83 */
84 for (index = 0; index < (total_dirty >> PAGE_SHIFT); index++) {
85 page = find_or_create_page(inode->i_mapping, index, GFP_KERNEL);
86 if (!page) {
87 test_msg("Failed to allocate test page\n");
88 ret = -ENOMEM;
89 goto out;
90 }
91 SetPageDirty(page);
92 if (index) {
93 unlock_page(page);
94 } else {
95 get_page(page);
96 locked_page = page;
97 }
98 }
99
100 /* Test this scenario
101 * |--- delalloc ---|
102 * |--- search ---|
103 */
104 set_extent_delalloc(&tmp, 0, sectorsize - 1, 0, NULL);
105 start = 0;
106 end = 0;
107 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
108 &end, max_bytes);
109 if (!found) {
110 test_msg("Should have found at least one delalloc\n");
111 goto out_bits;
112 }
113 if (start != 0 || end != (sectorsize - 1)) {
114 test_msg("Expected start 0 end %u, got start %llu end %llu\n",
115 sectorsize - 1, start, end);
116 goto out_bits;
117 }
118 unlock_extent(&tmp, start, end);
119 unlock_page(locked_page);
120 put_page(locked_page);
121
122 /*
123 * Test this scenario
124 *
125 * |--- delalloc ---|
126 * |--- search ---|
127 */
128 test_start = SZ_64M;
129 locked_page = find_lock_page(inode->i_mapping,
130 test_start >> PAGE_SHIFT);
131 if (!locked_page) {
132 test_msg("Couldn't find the locked page\n");
133 goto out_bits;
134 }
135 set_extent_delalloc(&tmp, sectorsize, max_bytes - 1, 0, NULL);
136 start = test_start;
137 end = 0;
138 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
139 &end, max_bytes);
140 if (!found) {
141 test_msg("Couldn't find delalloc in our range\n");
142 goto out_bits;
143 }
144 if (start != test_start || end != max_bytes - 1) {
145 test_msg("Expected start %Lu end %Lu, got start %Lu, end "
146 "%Lu\n", test_start, max_bytes - 1, start, end);
147 goto out_bits;
148 }
149 if (process_page_range(inode, start, end,
150 PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
151 test_msg("There were unlocked pages in the range\n");
152 goto out_bits;
153 }
154 unlock_extent(&tmp, start, end);
155 /* locked_page was unlocked above */
156 put_page(locked_page);
157
158 /*
159 * Test this scenario
160 * |--- delalloc ---|
161 * |--- search ---|
162 */
163 test_start = max_bytes + sectorsize;
164 locked_page = find_lock_page(inode->i_mapping, test_start >>
165 PAGE_SHIFT);
166 if (!locked_page) {
167 test_msg("Couldn't find the locked page\n");
168 goto out_bits;
169 }
170 start = test_start;
171 end = 0;
172 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
173 &end, max_bytes);
174 if (found) {
175 test_msg("Found range when we shouldn't have\n");
176 goto out_bits;
177 }
178 if (end != (u64)-1) {
179 test_msg("Did not return the proper end offset\n");
180 goto out_bits;
181 }
182
183 /*
184 * Test this scenario
185 * [------- delalloc -------|
186 * [max_bytes]|-- search--|
187 *
188 * We are re-using our test_start from above since it works out well.
189 */
190 set_extent_delalloc(&tmp, max_bytes, total_dirty - 1, 0, NULL);
191 start = test_start;
192 end = 0;
193 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
194 &end, max_bytes);
195 if (!found) {
196 test_msg("Didn't find our range\n");
197 goto out_bits;
198 }
199 if (start != test_start || end != total_dirty - 1) {
200 test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
201 test_start, total_dirty - 1, start, end);
202 goto out_bits;
203 }
204 if (process_page_range(inode, start, end,
205 PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
206 test_msg("Pages in range were not all locked\n");
207 goto out_bits;
208 }
209 unlock_extent(&tmp, start, end);
210
211 /*
212 * Now to test where we run into a page that is no longer dirty in the
213 * range we want to find.
214 */
215 page = find_get_page(inode->i_mapping,
216 (max_bytes + SZ_1M) >> PAGE_SHIFT);
217 if (!page) {
218 test_msg("Couldn't find our page\n");
219 goto out_bits;
220 }
221 ClearPageDirty(page);
222 put_page(page);
223
224 /* We unlocked it in the previous test */
225 lock_page(locked_page);
226 start = test_start;
227 end = 0;
228 /*
229 * Currently if we fail to find dirty pages in the delalloc range we
230 * will adjust max_bytes down to PAGE_SIZE and then re-search. If
231 * this changes at any point in the future we will need to fix this
232 * tests expected behavior.
233 */
234 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
235 &end, max_bytes);
236 if (!found) {
237 test_msg("Didn't find our range\n");
238 goto out_bits;
239 }
240 if (start != test_start && end != test_start + PAGE_SIZE - 1) {
241 test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
242 test_start, test_start + PAGE_SIZE - 1, start,
243 end);
244 goto out_bits;
245 }
246 if (process_page_range(inode, start, end, PROCESS_TEST_LOCKED |
247 PROCESS_UNLOCK)) {
248 test_msg("Pages in range were not all locked\n");
249 goto out_bits;
250 }
251 ret = 0;
252out_bits:
253 clear_extent_bits(&tmp, 0, total_dirty - 1, (unsigned)-1);
254out:
255 if (locked_page)
256 put_page(locked_page);
257 process_page_range(inode, 0, total_dirty - 1,
258 PROCESS_UNLOCK | PROCESS_RELEASE);
259 iput(inode);
260 return ret;
261}
262
263static int check_eb_bitmap(unsigned long *bitmap, struct extent_buffer *eb,
264 unsigned long len)
265{
266 unsigned long i;
267
268 for (i = 0; i < len * BITS_PER_BYTE; i++) {
269 int bit, bit1;
270
271 bit = !!test_bit(i, bitmap);
272 bit1 = !!extent_buffer_test_bit(eb, 0, i);
273 if (bit1 != bit) {
274 test_msg("Bits do not match\n");
275 return -EINVAL;
276 }
277
278 bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
279 i % BITS_PER_BYTE);
280 if (bit1 != bit) {
281 test_msg("Offset bits do not match\n");
282 return -EINVAL;
283 }
284 }
285 return 0;
286}
287
288static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
289 unsigned long len)
290{
291 unsigned long i, j;
292 u32 x;
293 int ret;
294
295 memset(bitmap, 0, len);
296 memzero_extent_buffer(eb, 0, len);
297 if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
298 test_msg("Bitmap was not zeroed\n");
299 return -EINVAL;
300 }
301
302 bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
303 extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
304 ret = check_eb_bitmap(bitmap, eb, len);
305 if (ret) {
306 test_msg("Setting all bits failed\n");
307 return ret;
308 }
309
310 bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
311 extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
312 ret = check_eb_bitmap(bitmap, eb, len);
313 if (ret) {
314 test_msg("Clearing all bits failed\n");
315 return ret;
316 }
317
318 /* Straddling pages test */
319 if (len > PAGE_SIZE) {
320 bitmap_set(bitmap,
321 (PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
322 sizeof(long) * BITS_PER_BYTE);
323 extent_buffer_bitmap_set(eb, PAGE_SIZE - sizeof(long) / 2, 0,
324 sizeof(long) * BITS_PER_BYTE);
325 ret = check_eb_bitmap(bitmap, eb, len);
326 if (ret) {
327 test_msg("Setting straddling pages failed\n");
328 return ret;
329 }
330
331 bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
332 bitmap_clear(bitmap,
333 (PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
334 sizeof(long) * BITS_PER_BYTE);
335 extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
336 extent_buffer_bitmap_clear(eb, PAGE_SIZE - sizeof(long) / 2, 0,
337 sizeof(long) * BITS_PER_BYTE);
338 ret = check_eb_bitmap(bitmap, eb, len);
339 if (ret) {
340 test_msg("Clearing straddling pages failed\n");
341 return ret;
342 }
343 }
344
345 /*
346 * Generate a wonky pseudo-random bit pattern for the sake of not using
347 * something repetitive that could miss some hypothetical off-by-n bug.
348 */
349 x = 0;
350 bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
351 extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
352 for (i = 0; i < len * BITS_PER_BYTE / 32; i++) {
353 x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffU;
354 for (j = 0; j < 32; j++) {
355 if (x & (1U << j)) {
356 bitmap_set(bitmap, i * 32 + j, 1);
357 extent_buffer_bitmap_set(eb, 0, i * 32 + j, 1);
358 }
359 }
360 }
361
362 ret = check_eb_bitmap(bitmap, eb, len);
363 if (ret) {
364 test_msg("Random bit pattern failed\n");
365 return ret;
366 }
367
368 return 0;
369}
370
371static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
372{
373 struct btrfs_fs_info *fs_info;
374 unsigned long len;
375 unsigned long *bitmap;
376 struct extent_buffer *eb;
377 int ret;
378
379 test_msg("Running extent buffer bitmap tests\n");
380
381 /*
382 * In ppc64, sectorsize can be 64K, thus 4 * 64K will be larger than
383 * BTRFS_MAX_METADATA_BLOCKSIZE.
384 */
385 len = (sectorsize < BTRFS_MAX_METADATA_BLOCKSIZE)
386 ? sectorsize * 4 : sectorsize;
387
388 fs_info = btrfs_alloc_dummy_fs_info(len, len);
389
390 bitmap = kmalloc(len, GFP_KERNEL);
391 if (!bitmap) {
392 test_msg("Couldn't allocate test bitmap\n");
393 return -ENOMEM;
394 }
395
396 eb = __alloc_dummy_extent_buffer(fs_info, 0, len);
397 if (!eb) {
398 test_msg("Couldn't allocate test extent buffer\n");
399 kfree(bitmap);
400 return -ENOMEM;
401 }
402
403 ret = __test_eb_bitmaps(bitmap, eb, len);
404 if (ret)
405 goto out;
406
407 /* Do it over again with an extent buffer which isn't page-aligned. */
408 free_extent_buffer(eb);
409 eb = __alloc_dummy_extent_buffer(NULL, nodesize / 2, len);
410 if (!eb) {
411 test_msg("Couldn't allocate test extent buffer\n");
412 kfree(bitmap);
413 return -ENOMEM;
414 }
415
416 ret = __test_eb_bitmaps(bitmap, eb, len);
417out:
418 free_extent_buffer(eb);
419 kfree(bitmap);
420 return ret;
421}
422
423int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
424{
425 int ret;
426
427 test_msg("Running extent I/O tests\n");
428
429 ret = test_find_delalloc(sectorsize);
430 if (ret)
431 goto out;
432
433 ret = test_eb_bitmaps(sectorsize, nodesize);
434out:
435 test_msg("Extent I/O tests finished\n");
436 return ret;
437}