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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/*
2 * Copyright (C) 2013 Fusion IO. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#include <linux/pagemap.h>
20#include <linux/sched.h>
21#include <linux/slab.h>
22#include <linux/sizes.h>
23#include "btrfs-tests.h"
24#include "../extent_io.h"
25
26#define PROCESS_UNLOCK (1 << 0)
27#define PROCESS_RELEASE (1 << 1)
28#define PROCESS_TEST_LOCKED (1 << 2)
29
30static noinline int process_page_range(struct inode *inode, u64 start, u64 end,
31 unsigned long flags)
32{
33 int ret;
34 struct page *pages[16];
35 unsigned long index = start >> PAGE_SHIFT;
36 unsigned long end_index = end >> PAGE_SHIFT;
37 unsigned long nr_pages = end_index - index + 1;
38 int i;
39 int count = 0;
40 int loops = 0;
41
42 while (nr_pages > 0) {
43 ret = find_get_pages_contig(inode->i_mapping, index,
44 min_t(unsigned long, nr_pages,
45 ARRAY_SIZE(pages)), pages);
46 for (i = 0; i < ret; i++) {
47 if (flags & PROCESS_TEST_LOCKED &&
48 !PageLocked(pages[i]))
49 count++;
50 if (flags & PROCESS_UNLOCK && PageLocked(pages[i]))
51 unlock_page(pages[i]);
52 put_page(pages[i]);
53 if (flags & PROCESS_RELEASE)
54 put_page(pages[i]);
55 }
56 nr_pages -= ret;
57 index += ret;
58 cond_resched();
59 loops++;
60 if (loops > 100000) {
61 printk(KERN_ERR "stuck in a loop, start %Lu, end %Lu, nr_pages %lu, ret %d\n", start, end, nr_pages, ret);
62 break;
63 }
64 }
65 return count;
66}
67
68static int test_find_delalloc(void)
69{
70 struct inode *inode;
71 struct extent_io_tree tmp;
72 struct page *page;
73 struct page *locked_page = NULL;
74 unsigned long index = 0;
75 u64 total_dirty = SZ_256M;
76 u64 max_bytes = SZ_128M;
77 u64 start, end, test_start;
78 u64 found;
79 int ret = -EINVAL;
80
81 test_msg("Running find delalloc tests\n");
82
83 inode = btrfs_new_test_inode();
84 if (!inode) {
85 test_msg("Failed to allocate test inode\n");
86 return -ENOMEM;
87 }
88
89 extent_io_tree_init(&tmp, &inode->i_data);
90
91 /*
92 * First go through and create and mark all of our pages dirty, we pin
93 * everything to make sure our pages don't get evicted and screw up our
94 * test.
95 */
96 for (index = 0; index < (total_dirty >> PAGE_SHIFT); index++) {
97 page = find_or_create_page(inode->i_mapping, index, GFP_KERNEL);
98 if (!page) {
99 test_msg("Failed to allocate test page\n");
100 ret = -ENOMEM;
101 goto out;
102 }
103 SetPageDirty(page);
104 if (index) {
105 unlock_page(page);
106 } else {
107 get_page(page);
108 locked_page = page;
109 }
110 }
111
112 /* Test this scenario
113 * |--- delalloc ---|
114 * |--- search ---|
115 */
116 set_extent_delalloc(&tmp, 0, 4095, NULL, GFP_KERNEL);
117 start = 0;
118 end = 0;
119 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
120 &end, max_bytes);
121 if (!found) {
122 test_msg("Should have found at least one delalloc\n");
123 goto out_bits;
124 }
125 if (start != 0 || end != 4095) {
126 test_msg("Expected start 0 end 4095, got start %Lu end %Lu\n",
127 start, end);
128 goto out_bits;
129 }
130 unlock_extent(&tmp, start, end);
131 unlock_page(locked_page);
132 put_page(locked_page);
133
134 /*
135 * Test this scenario
136 *
137 * |--- delalloc ---|
138 * |--- search ---|
139 */
140 test_start = SZ_64M;
141 locked_page = find_lock_page(inode->i_mapping,
142 test_start >> PAGE_SHIFT);
143 if (!locked_page) {
144 test_msg("Couldn't find the locked page\n");
145 goto out_bits;
146 }
147 set_extent_delalloc(&tmp, 4096, max_bytes - 1, NULL, GFP_KERNEL);
148 start = test_start;
149 end = 0;
150 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
151 &end, max_bytes);
152 if (!found) {
153 test_msg("Couldn't find delalloc in our range\n");
154 goto out_bits;
155 }
156 if (start != test_start || end != max_bytes - 1) {
157 test_msg("Expected start %Lu end %Lu, got start %Lu, end "
158 "%Lu\n", test_start, max_bytes - 1, start, end);
159 goto out_bits;
160 }
161 if (process_page_range(inode, start, end,
162 PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
163 test_msg("There were unlocked pages in the range\n");
164 goto out_bits;
165 }
166 unlock_extent(&tmp, start, end);
167 /* locked_page was unlocked above */
168 put_page(locked_page);
169
170 /*
171 * Test this scenario
172 * |--- delalloc ---|
173 * |--- search ---|
174 */
175 test_start = max_bytes + 4096;
176 locked_page = find_lock_page(inode->i_mapping, test_start >>
177 PAGE_SHIFT);
178 if (!locked_page) {
179 test_msg("Could'nt find the locked page\n");
180 goto out_bits;
181 }
182 start = test_start;
183 end = 0;
184 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
185 &end, max_bytes);
186 if (found) {
187 test_msg("Found range when we shouldn't have\n");
188 goto out_bits;
189 }
190 if (end != (u64)-1) {
191 test_msg("Did not return the proper end offset\n");
192 goto out_bits;
193 }
194
195 /*
196 * Test this scenario
197 * [------- delalloc -------|
198 * [max_bytes]|-- search--|
199 *
200 * We are re-using our test_start from above since it works out well.
201 */
202 set_extent_delalloc(&tmp, max_bytes, total_dirty - 1, NULL, GFP_KERNEL);
203 start = test_start;
204 end = 0;
205 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
206 &end, max_bytes);
207 if (!found) {
208 test_msg("Didn't find our range\n");
209 goto out_bits;
210 }
211 if (start != test_start || end != total_dirty - 1) {
212 test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
213 test_start, total_dirty - 1, start, end);
214 goto out_bits;
215 }
216 if (process_page_range(inode, start, end,
217 PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
218 test_msg("Pages in range were not all locked\n");
219 goto out_bits;
220 }
221 unlock_extent(&tmp, start, end);
222
223 /*
224 * Now to test where we run into a page that is no longer dirty in the
225 * range we want to find.
226 */
227 page = find_get_page(inode->i_mapping,
228 (max_bytes + SZ_1M) >> PAGE_SHIFT);
229 if (!page) {
230 test_msg("Couldn't find our page\n");
231 goto out_bits;
232 }
233 ClearPageDirty(page);
234 put_page(page);
235
236 /* We unlocked it in the previous test */
237 lock_page(locked_page);
238 start = test_start;
239 end = 0;
240 /*
241 * Currently if we fail to find dirty pages in the delalloc range we
242 * will adjust max_bytes down to PAGE_SIZE and then re-search. If
243 * this changes at any point in the future we will need to fix this
244 * tests expected behavior.
245 */
246 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
247 &end, max_bytes);
248 if (!found) {
249 test_msg("Didn't find our range\n");
250 goto out_bits;
251 }
252 if (start != test_start && end != test_start + PAGE_SIZE - 1) {
253 test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
254 test_start, test_start + PAGE_SIZE - 1, start,
255 end);
256 goto out_bits;
257 }
258 if (process_page_range(inode, start, end, PROCESS_TEST_LOCKED |
259 PROCESS_UNLOCK)) {
260 test_msg("Pages in range were not all locked\n");
261 goto out_bits;
262 }
263 ret = 0;
264out_bits:
265 clear_extent_bits(&tmp, 0, total_dirty - 1, (unsigned)-1, GFP_KERNEL);
266out:
267 if (locked_page)
268 put_page(locked_page);
269 process_page_range(inode, 0, total_dirty - 1,
270 PROCESS_UNLOCK | PROCESS_RELEASE);
271 iput(inode);
272 return ret;
273}
274
275static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
276 unsigned long len)
277{
278 unsigned long i, x;
279
280 memset(bitmap, 0, len);
281 memset_extent_buffer(eb, 0, 0, len);
282 if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
283 test_msg("Bitmap was not zeroed\n");
284 return -EINVAL;
285 }
286
287 bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
288 extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
289 if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
290 test_msg("Setting all bits failed\n");
291 return -EINVAL;
292 }
293
294 bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
295 extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
296 if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
297 test_msg("Clearing all bits failed\n");
298 return -EINVAL;
299 }
300
301 bitmap_set(bitmap, (PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
302 sizeof(long) * BITS_PER_BYTE);
303 extent_buffer_bitmap_set(eb, PAGE_SIZE - sizeof(long) / 2, 0,
304 sizeof(long) * BITS_PER_BYTE);
305 if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
306 test_msg("Setting straddling pages failed\n");
307 return -EINVAL;
308 }
309
310 bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
311 bitmap_clear(bitmap,
312 (PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
313 sizeof(long) * BITS_PER_BYTE);
314 extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
315 extent_buffer_bitmap_clear(eb, PAGE_SIZE - sizeof(long) / 2, 0,
316 sizeof(long) * BITS_PER_BYTE);
317 if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
318 test_msg("Clearing straddling pages failed\n");
319 return -EINVAL;
320 }
321
322 /*
323 * Generate a wonky pseudo-random bit pattern for the sake of not using
324 * something repetitive that could miss some hypothetical off-by-n bug.
325 */
326 x = 0;
327 for (i = 0; i < len / sizeof(long); i++) {
328 x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffUL;
329 bitmap[i] = x;
330 }
331 write_extent_buffer(eb, bitmap, 0, len);
332
333 for (i = 0; i < len * BITS_PER_BYTE; i++) {
334 int bit, bit1;
335
336 bit = !!test_bit(i, bitmap);
337 bit1 = !!extent_buffer_test_bit(eb, 0, i);
338 if (bit1 != bit) {
339 test_msg("Testing bit pattern failed\n");
340 return -EINVAL;
341 }
342
343 bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
344 i % BITS_PER_BYTE);
345 if (bit1 != bit) {
346 test_msg("Testing bit pattern with offset failed\n");
347 return -EINVAL;
348 }
349 }
350
351 return 0;
352}
353
354static int test_eb_bitmaps(void)
355{
356 unsigned long len = PAGE_SIZE * 4;
357 unsigned long *bitmap;
358 struct extent_buffer *eb;
359 int ret;
360
361 test_msg("Running extent buffer bitmap tests\n");
362
363 bitmap = kmalloc(len, GFP_KERNEL);
364 if (!bitmap) {
365 test_msg("Couldn't allocate test bitmap\n");
366 return -ENOMEM;
367 }
368
369 eb = __alloc_dummy_extent_buffer(NULL, 0, len);
370 if (!eb) {
371 test_msg("Couldn't allocate test extent buffer\n");
372 kfree(bitmap);
373 return -ENOMEM;
374 }
375
376 ret = __test_eb_bitmaps(bitmap, eb, len);
377 if (ret)
378 goto out;
379
380 /* Do it over again with an extent buffer which isn't page-aligned. */
381 free_extent_buffer(eb);
382 eb = __alloc_dummy_extent_buffer(NULL, PAGE_SIZE / 2, len);
383 if (!eb) {
384 test_msg("Couldn't allocate test extent buffer\n");
385 kfree(bitmap);
386 return -ENOMEM;
387 }
388
389 ret = __test_eb_bitmaps(bitmap, eb, len);
390out:
391 free_extent_buffer(eb);
392 kfree(bitmap);
393 return ret;
394}
395
396int btrfs_test_extent_io(void)
397{
398 int ret;
399
400 test_msg("Running extent I/O tests\n");
401
402 ret = test_find_delalloc();
403 if (ret)
404 goto out;
405
406 ret = test_eb_bitmaps();
407out:
408 test_msg("Extent I/O tests finished\n");
409 return ret;
410}