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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 "btrfs-tests.h"
20#include "../ctree.h"
21#include "../btrfs_inode.h"
22#include "../disk-io.h"
23#include "../extent_io.h"
24#include "../volumes.h"
25#include "../compression.h"
26
27static void insert_extent(struct btrfs_root *root, u64 start, u64 len,
28 u64 ram_bytes, u64 offset, u64 disk_bytenr,
29 u64 disk_len, u32 type, u8 compression, int slot)
30{
31 struct btrfs_path path;
32 struct btrfs_file_extent_item *fi;
33 struct extent_buffer *leaf = root->node;
34 struct btrfs_key key;
35 u32 value_len = sizeof(struct btrfs_file_extent_item);
36
37 if (type == BTRFS_FILE_EXTENT_INLINE)
38 value_len += len;
39 memset(&path, 0, sizeof(path));
40
41 path.nodes[0] = leaf;
42 path.slots[0] = slot;
43
44 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
45 key.type = BTRFS_EXTENT_DATA_KEY;
46 key.offset = start;
47
48 setup_items_for_insert(root, &path, &key, &value_len, value_len,
49 value_len + sizeof(struct btrfs_item), 1);
50 fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
51 btrfs_set_file_extent_generation(leaf, fi, 1);
52 btrfs_set_file_extent_type(leaf, fi, type);
53 btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
54 btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_len);
55 btrfs_set_file_extent_offset(leaf, fi, offset);
56 btrfs_set_file_extent_num_bytes(leaf, fi, len);
57 btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes);
58 btrfs_set_file_extent_compression(leaf, fi, compression);
59 btrfs_set_file_extent_encryption(leaf, fi, 0);
60 btrfs_set_file_extent_other_encoding(leaf, fi, 0);
61}
62
63static void insert_inode_item_key(struct btrfs_root *root)
64{
65 struct btrfs_path path;
66 struct extent_buffer *leaf = root->node;
67 struct btrfs_key key;
68 u32 value_len = 0;
69
70 memset(&path, 0, sizeof(path));
71
72 path.nodes[0] = leaf;
73 path.slots[0] = 0;
74
75 key.objectid = BTRFS_INODE_ITEM_KEY;
76 key.type = BTRFS_INODE_ITEM_KEY;
77 key.offset = 0;
78
79 setup_items_for_insert(root, &path, &key, &value_len, value_len,
80 value_len + sizeof(struct btrfs_item), 1);
81}
82
83/*
84 * Build the most complicated map of extents the earth has ever seen. We want
85 * this so we can test all of the corner cases of btrfs_get_extent. Here is a
86 * diagram of how the extents will look though this may not be possible we still
87 * want to make sure everything acts normally (the last number is not inclusive)
88 *
89 * [0 - 5][5 - 6][6 - 10][10 - 4096][ 4096 - 8192 ][8192 - 12288]
90 * [hole ][inline][ hole ][ regular ][regular1 split][ hole ]
91 *
92 * [ 12288 - 20480][20480 - 24576][ 24576 - 28672 ][28672 - 36864][36864 - 45056]
93 * [regular1 split][ prealloc1 ][prealloc1 written][ prealloc1 ][ compressed ]
94 *
95 * [45056 - 49152][49152-53248][53248-61440][61440-65536][ 65536+81920 ]
96 * [ compressed1 ][ regular ][compressed1][ regular ][ hole but no extent]
97 *
98 * [81920-86016]
99 * [ regular ]
100 */
101static void setup_file_extents(struct btrfs_root *root)
102{
103 int slot = 0;
104 u64 disk_bytenr = SZ_1M;
105 u64 offset = 0;
106
107 /* First we want a hole */
108 insert_extent(root, offset, 5, 5, 0, 0, 0, BTRFS_FILE_EXTENT_REG, 0,
109 slot);
110 slot++;
111 offset += 5;
112
113 /*
114 * Now we want an inline extent, I don't think this is possible but hey
115 * why not? Also keep in mind if we have an inline extent it counts as
116 * the whole first page. If we were to expand it we would have to cow
117 * and we wouldn't have an inline extent anymore.
118 */
119 insert_extent(root, offset, 1, 1, 0, 0, 0, BTRFS_FILE_EXTENT_INLINE, 0,
120 slot);
121 slot++;
122 offset = 4096;
123
124 /* Now another hole */
125 insert_extent(root, offset, 4, 4, 0, 0, 0, BTRFS_FILE_EXTENT_REG, 0,
126 slot);
127 slot++;
128 offset += 4;
129
130 /* Now for a regular extent */
131 insert_extent(root, offset, 4095, 4095, 0, disk_bytenr, 4096,
132 BTRFS_FILE_EXTENT_REG, 0, slot);
133 slot++;
134 disk_bytenr += 4096;
135 offset += 4095;
136
137 /*
138 * Now for 3 extents that were split from a hole punch so we test
139 * offsets properly.
140 */
141 insert_extent(root, offset, 4096, 16384, 0, disk_bytenr, 16384,
142 BTRFS_FILE_EXTENT_REG, 0, slot);
143 slot++;
144 offset += 4096;
145 insert_extent(root, offset, 4096, 4096, 0, 0, 0, BTRFS_FILE_EXTENT_REG,
146 0, slot);
147 slot++;
148 offset += 4096;
149 insert_extent(root, offset, 8192, 16384, 8192, disk_bytenr, 16384,
150 BTRFS_FILE_EXTENT_REG, 0, slot);
151 slot++;
152 offset += 8192;
153 disk_bytenr += 16384;
154
155 /* Now for a unwritten prealloc extent */
156 insert_extent(root, offset, 4096, 4096, 0, disk_bytenr, 4096,
157 BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
158 slot++;
159 offset += 4096;
160
161 /*
162 * We want to jack up disk_bytenr a little more so the em stuff doesn't
163 * merge our records.
164 */
165 disk_bytenr += 8192;
166
167 /*
168 * Now for a partially written prealloc extent, basically the same as
169 * the hole punch example above. Ram_bytes never changes when you mark
170 * extents written btw.
171 */
172 insert_extent(root, offset, 4096, 16384, 0, disk_bytenr, 16384,
173 BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
174 slot++;
175 offset += 4096;
176 insert_extent(root, offset, 4096, 16384, 4096, disk_bytenr, 16384,
177 BTRFS_FILE_EXTENT_REG, 0, slot);
178 slot++;
179 offset += 4096;
180 insert_extent(root, offset, 8192, 16384, 8192, disk_bytenr, 16384,
181 BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
182 slot++;
183 offset += 8192;
184 disk_bytenr += 16384;
185
186 /* Now a normal compressed extent */
187 insert_extent(root, offset, 8192, 8192, 0, disk_bytenr, 4096,
188 BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
189 slot++;
190 offset += 8192;
191 /* No merges */
192 disk_bytenr += 8192;
193
194 /* Now a split compressed extent */
195 insert_extent(root, offset, 4096, 16384, 0, disk_bytenr, 4096,
196 BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
197 slot++;
198 offset += 4096;
199 insert_extent(root, offset, 4096, 4096, 0, disk_bytenr + 4096, 4096,
200 BTRFS_FILE_EXTENT_REG, 0, slot);
201 slot++;
202 offset += 4096;
203 insert_extent(root, offset, 8192, 16384, 8192, disk_bytenr, 4096,
204 BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
205 slot++;
206 offset += 8192;
207 disk_bytenr += 8192;
208
209 /* Now extents that have a hole but no hole extent */
210 insert_extent(root, offset, 4096, 4096, 0, disk_bytenr, 4096,
211 BTRFS_FILE_EXTENT_REG, 0, slot);
212 slot++;
213 offset += 16384;
214 disk_bytenr += 4096;
215 insert_extent(root, offset, 4096, 4096, 0, disk_bytenr, 4096,
216 BTRFS_FILE_EXTENT_REG, 0, slot);
217}
218
219static unsigned long prealloc_only = 0;
220static unsigned long compressed_only = 0;
221static unsigned long vacancy_only = 0;
222
223static noinline int test_btrfs_get_extent(void)
224{
225 struct inode *inode = NULL;
226 struct btrfs_root *root = NULL;
227 struct extent_map *em = NULL;
228 u64 orig_start;
229 u64 disk_bytenr;
230 u64 offset;
231 int ret = -ENOMEM;
232
233 inode = btrfs_new_test_inode();
234 if (!inode) {
235 test_msg("Couldn't allocate inode\n");
236 return ret;
237 }
238
239 BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
240 BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
241 BTRFS_I(inode)->location.offset = 0;
242
243 root = btrfs_alloc_dummy_root();
244 if (IS_ERR(root)) {
245 test_msg("Couldn't allocate root\n");
246 goto out;
247 }
248
249 /*
250 * We do this since btrfs_get_extent wants to assign em->bdev to
251 * root->fs_info->fs_devices->latest_bdev.
252 */
253 root->fs_info = btrfs_alloc_dummy_fs_info();
254 if (!root->fs_info) {
255 test_msg("Couldn't allocate dummy fs info\n");
256 goto out;
257 }
258
259 root->node = alloc_dummy_extent_buffer(NULL, 4096);
260 if (!root->node) {
261 test_msg("Couldn't allocate dummy buffer\n");
262 goto out;
263 }
264
265 /*
266 * We will just free a dummy node if it's ref count is 2 so we need an
267 * extra ref so our searches don't accidently release our page.
268 */
269 extent_buffer_get(root->node);
270 btrfs_set_header_nritems(root->node, 0);
271 btrfs_set_header_level(root->node, 0);
272 ret = -EINVAL;
273
274 /* First with no extents */
275 BTRFS_I(inode)->root = root;
276 em = btrfs_get_extent(inode, NULL, 0, 0, 4096, 0);
277 if (IS_ERR(em)) {
278 em = NULL;
279 test_msg("Got an error when we shouldn't have\n");
280 goto out;
281 }
282 if (em->block_start != EXTENT_MAP_HOLE) {
283 test_msg("Expected a hole, got %llu\n", em->block_start);
284 goto out;
285 }
286 if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags)) {
287 test_msg("Vacancy flag wasn't set properly\n");
288 goto out;
289 }
290 free_extent_map(em);
291 btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
292
293 /*
294 * All of the magic numbers are based on the mapping setup in
295 * setup_file_extents, so if you change anything there you need to
296 * update the comment and update the expected values below.
297 */
298 setup_file_extents(root);
299
300 em = btrfs_get_extent(inode, NULL, 0, 0, (u64)-1, 0);
301 if (IS_ERR(em)) {
302 test_msg("Got an error when we shouldn't have\n");
303 goto out;
304 }
305 if (em->block_start != EXTENT_MAP_HOLE) {
306 test_msg("Expected a hole, got %llu\n", em->block_start);
307 goto out;
308 }
309 if (em->start != 0 || em->len != 5) {
310 test_msg("Unexpected extent wanted start 0 len 5, got start "
311 "%llu len %llu\n", em->start, em->len);
312 goto out;
313 }
314 if (em->flags != 0) {
315 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
316 goto out;
317 }
318 offset = em->start + em->len;
319 free_extent_map(em);
320
321 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
322 if (IS_ERR(em)) {
323 test_msg("Got an error when we shouldn't have\n");
324 goto out;
325 }
326 if (em->block_start != EXTENT_MAP_INLINE) {
327 test_msg("Expected an inline, got %llu\n", em->block_start);
328 goto out;
329 }
330 if (em->start != offset || em->len != 4091) {
331 test_msg("Unexpected extent wanted start %llu len 1, got start "
332 "%llu len %llu\n", offset, em->start, em->len);
333 goto out;
334 }
335 if (em->flags != 0) {
336 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
337 goto out;
338 }
339 /*
340 * We don't test anything else for inline since it doesn't get set
341 * unless we have a page for it to write into. Maybe we should change
342 * this?
343 */
344 offset = em->start + em->len;
345 free_extent_map(em);
346
347 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
348 if (IS_ERR(em)) {
349 test_msg("Got an error when we shouldn't have\n");
350 goto out;
351 }
352 if (em->block_start != EXTENT_MAP_HOLE) {
353 test_msg("Expected a hole, got %llu\n", em->block_start);
354 goto out;
355 }
356 if (em->start != offset || em->len != 4) {
357 test_msg("Unexpected extent wanted start %llu len 4, got start "
358 "%llu len %llu\n", offset, em->start, em->len);
359 goto out;
360 }
361 if (em->flags != 0) {
362 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
363 goto out;
364 }
365 offset = em->start + em->len;
366 free_extent_map(em);
367
368 /* Regular extent */
369 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
370 if (IS_ERR(em)) {
371 test_msg("Got an error when we shouldn't have\n");
372 goto out;
373 }
374 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
375 test_msg("Expected a real extent, got %llu\n", em->block_start);
376 goto out;
377 }
378 if (em->start != offset || em->len != 4095) {
379 test_msg("Unexpected extent wanted start %llu len 4095, got "
380 "start %llu len %llu\n", offset, em->start, em->len);
381 goto out;
382 }
383 if (em->flags != 0) {
384 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
385 goto out;
386 }
387 if (em->orig_start != em->start) {
388 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
389 em->orig_start);
390 goto out;
391 }
392 offset = em->start + em->len;
393 free_extent_map(em);
394
395 /* The next 3 are split extents */
396 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
397 if (IS_ERR(em)) {
398 test_msg("Got an error when we shouldn't have\n");
399 goto out;
400 }
401 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
402 test_msg("Expected a real extent, got %llu\n", em->block_start);
403 goto out;
404 }
405 if (em->start != offset || em->len != 4096) {
406 test_msg("Unexpected extent wanted start %llu len 4096, got "
407 "start %llu len %llu\n", offset, em->start, em->len);
408 goto out;
409 }
410 if (em->flags != 0) {
411 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
412 goto out;
413 }
414 if (em->orig_start != em->start) {
415 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
416 em->orig_start);
417 goto out;
418 }
419 disk_bytenr = em->block_start;
420 orig_start = em->start;
421 offset = em->start + em->len;
422 free_extent_map(em);
423
424 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
425 if (IS_ERR(em)) {
426 test_msg("Got an error when we shouldn't have\n");
427 goto out;
428 }
429 if (em->block_start != EXTENT_MAP_HOLE) {
430 test_msg("Expected a hole, got %llu\n", em->block_start);
431 goto out;
432 }
433 if (em->start != offset || em->len != 4096) {
434 test_msg("Unexpected extent wanted start %llu len 4096, got "
435 "start %llu len %llu\n", offset, em->start, em->len);
436 goto out;
437 }
438 if (em->flags != 0) {
439 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
440 goto out;
441 }
442 offset = em->start + em->len;
443 free_extent_map(em);
444
445 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
446 if (IS_ERR(em)) {
447 test_msg("Got an error when we shouldn't have\n");
448 goto out;
449 }
450 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
451 test_msg("Expected a real extent, got %llu\n", em->block_start);
452 goto out;
453 }
454 if (em->start != offset || em->len != 8192) {
455 test_msg("Unexpected extent wanted start %llu len 8192, got "
456 "start %llu len %llu\n", offset, em->start, em->len);
457 goto out;
458 }
459 if (em->flags != 0) {
460 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
461 goto out;
462 }
463 if (em->orig_start != orig_start) {
464 test_msg("Wrong orig offset, want %llu, have %llu\n",
465 orig_start, em->orig_start);
466 goto out;
467 }
468 disk_bytenr += (em->start - orig_start);
469 if (em->block_start != disk_bytenr) {
470 test_msg("Wrong block start, want %llu, have %llu\n",
471 disk_bytenr, em->block_start);
472 goto out;
473 }
474 offset = em->start + em->len;
475 free_extent_map(em);
476
477 /* Prealloc extent */
478 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
479 if (IS_ERR(em)) {
480 test_msg("Got an error when we shouldn't have\n");
481 goto out;
482 }
483 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
484 test_msg("Expected a real extent, got %llu\n", em->block_start);
485 goto out;
486 }
487 if (em->start != offset || em->len != 4096) {
488 test_msg("Unexpected extent wanted start %llu len 4096, got "
489 "start %llu len %llu\n", offset, em->start, em->len);
490 goto out;
491 }
492 if (em->flags != prealloc_only) {
493 test_msg("Unexpected flags set, want %lu have %lu\n",
494 prealloc_only, em->flags);
495 goto out;
496 }
497 if (em->orig_start != em->start) {
498 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
499 em->orig_start);
500 goto out;
501 }
502 offset = em->start + em->len;
503 free_extent_map(em);
504
505 /* The next 3 are a half written prealloc extent */
506 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
507 if (IS_ERR(em)) {
508 test_msg("Got an error when we shouldn't have\n");
509 goto out;
510 }
511 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
512 test_msg("Expected a real extent, got %llu\n", em->block_start);
513 goto out;
514 }
515 if (em->start != offset || em->len != 4096) {
516 test_msg("Unexpected extent wanted start %llu len 4096, got "
517 "start %llu len %llu\n", offset, em->start, em->len);
518 goto out;
519 }
520 if (em->flags != prealloc_only) {
521 test_msg("Unexpected flags set, want %lu have %lu\n",
522 prealloc_only, em->flags);
523 goto out;
524 }
525 if (em->orig_start != em->start) {
526 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
527 em->orig_start);
528 goto out;
529 }
530 disk_bytenr = em->block_start;
531 orig_start = em->start;
532 offset = em->start + em->len;
533 free_extent_map(em);
534
535 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
536 if (IS_ERR(em)) {
537 test_msg("Got an error when we shouldn't have\n");
538 goto out;
539 }
540 if (em->block_start >= EXTENT_MAP_HOLE) {
541 test_msg("Expected a real extent, got %llu\n", em->block_start);
542 goto out;
543 }
544 if (em->start != offset || em->len != 4096) {
545 test_msg("Unexpected extent wanted start %llu len 4096, got "
546 "start %llu len %llu\n", offset, em->start, em->len);
547 goto out;
548 }
549 if (em->flags != 0) {
550 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
551 goto out;
552 }
553 if (em->orig_start != orig_start) {
554 test_msg("Unexpected orig offset, wanted %llu, have %llu\n",
555 orig_start, em->orig_start);
556 goto out;
557 }
558 if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
559 test_msg("Unexpected block start, wanted %llu, have %llu\n",
560 disk_bytenr + (em->start - em->orig_start),
561 em->block_start);
562 goto out;
563 }
564 offset = em->start + em->len;
565 free_extent_map(em);
566
567 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
568 if (IS_ERR(em)) {
569 test_msg("Got an error when we shouldn't have\n");
570 goto out;
571 }
572 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
573 test_msg("Expected a real extent, got %llu\n", em->block_start);
574 goto out;
575 }
576 if (em->start != offset || em->len != 8192) {
577 test_msg("Unexpected extent wanted start %llu len 8192, got "
578 "start %llu len %llu\n", offset, em->start, em->len);
579 goto out;
580 }
581 if (em->flags != prealloc_only) {
582 test_msg("Unexpected flags set, want %lu have %lu\n",
583 prealloc_only, em->flags);
584 goto out;
585 }
586 if (em->orig_start != orig_start) {
587 test_msg("Wrong orig offset, want %llu, have %llu\n", orig_start,
588 em->orig_start);
589 goto out;
590 }
591 if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
592 test_msg("Unexpected block start, wanted %llu, have %llu\n",
593 disk_bytenr + (em->start - em->orig_start),
594 em->block_start);
595 goto out;
596 }
597 offset = em->start + em->len;
598 free_extent_map(em);
599
600 /* Now for the compressed extent */
601 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
602 if (IS_ERR(em)) {
603 test_msg("Got an error when we shouldn't have\n");
604 goto out;
605 }
606 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
607 test_msg("Expected a real extent, got %llu\n", em->block_start);
608 goto out;
609 }
610 if (em->start != offset || em->len != 8192) {
611 test_msg("Unexpected extent wanted start %llu len 8192, got "
612 "start %llu len %llu\n", offset, em->start, em->len);
613 goto out;
614 }
615 if (em->flags != compressed_only) {
616 test_msg("Unexpected flags set, want %lu have %lu\n",
617 compressed_only, em->flags);
618 goto out;
619 }
620 if (em->orig_start != em->start) {
621 test_msg("Wrong orig offset, want %llu, have %llu\n",
622 em->start, em->orig_start);
623 goto out;
624 }
625 if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
626 test_msg("Unexpected compress type, wanted %d, got %d\n",
627 BTRFS_COMPRESS_ZLIB, em->compress_type);
628 goto out;
629 }
630 offset = em->start + em->len;
631 free_extent_map(em);
632
633 /* Split compressed extent */
634 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
635 if (IS_ERR(em)) {
636 test_msg("Got an error when we shouldn't have\n");
637 goto out;
638 }
639 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
640 test_msg("Expected a real extent, got %llu\n", em->block_start);
641 goto out;
642 }
643 if (em->start != offset || em->len != 4096) {
644 test_msg("Unexpected extent wanted start %llu len 4096, got "
645 "start %llu len %llu\n", offset, em->start, em->len);
646 goto out;
647 }
648 if (em->flags != compressed_only) {
649 test_msg("Unexpected flags set, want %lu have %lu\n",
650 compressed_only, em->flags);
651 goto out;
652 }
653 if (em->orig_start != em->start) {
654 test_msg("Wrong orig offset, want %llu, have %llu\n",
655 em->start, em->orig_start);
656 goto out;
657 }
658 if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
659 test_msg("Unexpected compress type, wanted %d, got %d\n",
660 BTRFS_COMPRESS_ZLIB, em->compress_type);
661 goto out;
662 }
663 disk_bytenr = em->block_start;
664 orig_start = em->start;
665 offset = em->start + em->len;
666 free_extent_map(em);
667
668 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
669 if (IS_ERR(em)) {
670 test_msg("Got an error when we shouldn't have\n");
671 goto out;
672 }
673 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
674 test_msg("Expected a real extent, got %llu\n", em->block_start);
675 goto out;
676 }
677 if (em->start != offset || em->len != 4096) {
678 test_msg("Unexpected extent wanted start %llu len 4096, got "
679 "start %llu len %llu\n", offset, em->start, em->len);
680 goto out;
681 }
682 if (em->flags != 0) {
683 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
684 goto out;
685 }
686 if (em->orig_start != em->start) {
687 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
688 em->orig_start);
689 goto out;
690 }
691 offset = em->start + em->len;
692 free_extent_map(em);
693
694 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
695 if (IS_ERR(em)) {
696 test_msg("Got an error when we shouldn't have\n");
697 goto out;
698 }
699 if (em->block_start != disk_bytenr) {
700 test_msg("Block start does not match, want %llu got %llu\n",
701 disk_bytenr, em->block_start);
702 goto out;
703 }
704 if (em->start != offset || em->len != 8192) {
705 test_msg("Unexpected extent wanted start %llu len 8192, got "
706 "start %llu len %llu\n", offset, em->start, em->len);
707 goto out;
708 }
709 if (em->flags != compressed_only) {
710 test_msg("Unexpected flags set, want %lu have %lu\n",
711 compressed_only, em->flags);
712 goto out;
713 }
714 if (em->orig_start != orig_start) {
715 test_msg("Wrong orig offset, want %llu, have %llu\n",
716 em->start, orig_start);
717 goto out;
718 }
719 if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
720 test_msg("Unexpected compress type, wanted %d, got %d\n",
721 BTRFS_COMPRESS_ZLIB, em->compress_type);
722 goto out;
723 }
724 offset = em->start + em->len;
725 free_extent_map(em);
726
727 /* A hole between regular extents but no hole extent */
728 em = btrfs_get_extent(inode, NULL, 0, offset + 6, 4096, 0);
729 if (IS_ERR(em)) {
730 test_msg("Got an error when we shouldn't have\n");
731 goto out;
732 }
733 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
734 test_msg("Expected a real extent, got %llu\n", em->block_start);
735 goto out;
736 }
737 if (em->start != offset || em->len != 4096) {
738 test_msg("Unexpected extent wanted start %llu len 4096, got "
739 "start %llu len %llu\n", offset, em->start, em->len);
740 goto out;
741 }
742 if (em->flags != 0) {
743 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
744 goto out;
745 }
746 if (em->orig_start != em->start) {
747 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
748 em->orig_start);
749 goto out;
750 }
751 offset = em->start + em->len;
752 free_extent_map(em);
753
754 em = btrfs_get_extent(inode, NULL, 0, offset, 4096 * 1024, 0);
755 if (IS_ERR(em)) {
756 test_msg("Got an error when we shouldn't have\n");
757 goto out;
758 }
759 if (em->block_start != EXTENT_MAP_HOLE) {
760 test_msg("Expected a hole extent, got %llu\n", em->block_start);
761 goto out;
762 }
763 /*
764 * Currently we just return a length that we requested rather than the
765 * length of the actual hole, if this changes we'll have to change this
766 * test.
767 */
768 if (em->start != offset || em->len != 12288) {
769 test_msg("Unexpected extent wanted start %llu len 12288, got "
770 "start %llu len %llu\n", offset, em->start, em->len);
771 goto out;
772 }
773 if (em->flags != vacancy_only) {
774 test_msg("Unexpected flags set, want %lu have %lu\n",
775 vacancy_only, em->flags);
776 goto out;
777 }
778 if (em->orig_start != em->start) {
779 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
780 em->orig_start);
781 goto out;
782 }
783 offset = em->start + em->len;
784 free_extent_map(em);
785
786 em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
787 if (IS_ERR(em)) {
788 test_msg("Got an error when we shouldn't have\n");
789 goto out;
790 }
791 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
792 test_msg("Expected a real extent, got %llu\n", em->block_start);
793 goto out;
794 }
795 if (em->start != offset || em->len != 4096) {
796 test_msg("Unexpected extent wanted start %llu len 4096, got "
797 "start %llu len %llu\n", offset, em->start, em->len);
798 goto out;
799 }
800 if (em->flags != 0) {
801 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
802 goto out;
803 }
804 if (em->orig_start != em->start) {
805 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
806 em->orig_start);
807 goto out;
808 }
809 ret = 0;
810out:
811 if (!IS_ERR(em))
812 free_extent_map(em);
813 iput(inode);
814 btrfs_free_dummy_root(root);
815 return ret;
816}
817
818static int test_hole_first(void)
819{
820 struct inode *inode = NULL;
821 struct btrfs_root *root = NULL;
822 struct extent_map *em = NULL;
823 int ret = -ENOMEM;
824
825 inode = btrfs_new_test_inode();
826 if (!inode) {
827 test_msg("Couldn't allocate inode\n");
828 return ret;
829 }
830
831 BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
832 BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
833 BTRFS_I(inode)->location.offset = 0;
834
835 root = btrfs_alloc_dummy_root();
836 if (IS_ERR(root)) {
837 test_msg("Couldn't allocate root\n");
838 goto out;
839 }
840
841 root->fs_info = btrfs_alloc_dummy_fs_info();
842 if (!root->fs_info) {
843 test_msg("Couldn't allocate dummy fs info\n");
844 goto out;
845 }
846
847 root->node = alloc_dummy_extent_buffer(NULL, 4096);
848 if (!root->node) {
849 test_msg("Couldn't allocate dummy buffer\n");
850 goto out;
851 }
852
853 extent_buffer_get(root->node);
854 btrfs_set_header_nritems(root->node, 0);
855 btrfs_set_header_level(root->node, 0);
856 BTRFS_I(inode)->root = root;
857 ret = -EINVAL;
858
859 /*
860 * Need a blank inode item here just so we don't confuse
861 * btrfs_get_extent.
862 */
863 insert_inode_item_key(root);
864 insert_extent(root, 4096, 4096, 4096, 0, 4096, 4096,
865 BTRFS_FILE_EXTENT_REG, 0, 1);
866 em = btrfs_get_extent(inode, NULL, 0, 0, 8192, 0);
867 if (IS_ERR(em)) {
868 test_msg("Got an error when we shouldn't have\n");
869 goto out;
870 }
871 if (em->block_start != EXTENT_MAP_HOLE) {
872 test_msg("Expected a hole, got %llu\n", em->block_start);
873 goto out;
874 }
875 if (em->start != 0 || em->len != 4096) {
876 test_msg("Unexpected extent wanted start 0 len 4096, got start "
877 "%llu len %llu\n", em->start, em->len);
878 goto out;
879 }
880 if (em->flags != vacancy_only) {
881 test_msg("Wrong flags, wanted %lu, have %lu\n", vacancy_only,
882 em->flags);
883 goto out;
884 }
885 free_extent_map(em);
886
887 em = btrfs_get_extent(inode, NULL, 0, 4096, 8192, 0);
888 if (IS_ERR(em)) {
889 test_msg("Got an error when we shouldn't have\n");
890 goto out;
891 }
892 if (em->block_start != 4096) {
893 test_msg("Expected a real extent, got %llu\n", em->block_start);
894 goto out;
895 }
896 if (em->start != 4096 || em->len != 4096) {
897 test_msg("Unexpected extent wanted start 4096 len 4096, got "
898 "start %llu len %llu\n", em->start, em->len);
899 goto out;
900 }
901 if (em->flags != 0) {
902 test_msg("Unexpected flags set, wanted 0 got %lu\n",
903 em->flags);
904 goto out;
905 }
906 ret = 0;
907out:
908 if (!IS_ERR(em))
909 free_extent_map(em);
910 iput(inode);
911 btrfs_free_dummy_root(root);
912 return ret;
913}
914
915static int test_extent_accounting(void)
916{
917 struct inode *inode = NULL;
918 struct btrfs_root *root = NULL;
919 int ret = -ENOMEM;
920
921 inode = btrfs_new_test_inode();
922 if (!inode) {
923 test_msg("Couldn't allocate inode\n");
924 return ret;
925 }
926
927 root = btrfs_alloc_dummy_root();
928 if (IS_ERR(root)) {
929 test_msg("Couldn't allocate root\n");
930 goto out;
931 }
932
933 root->fs_info = btrfs_alloc_dummy_fs_info();
934 if (!root->fs_info) {
935 test_msg("Couldn't allocate dummy fs info\n");
936 goto out;
937 }
938
939 BTRFS_I(inode)->root = root;
940 btrfs_test_inode_set_ops(inode);
941
942 /* [BTRFS_MAX_EXTENT_SIZE] */
943 BTRFS_I(inode)->outstanding_extents++;
944 ret = btrfs_set_extent_delalloc(inode, 0, BTRFS_MAX_EXTENT_SIZE - 1,
945 NULL);
946 if (ret) {
947 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
948 goto out;
949 }
950 if (BTRFS_I(inode)->outstanding_extents != 1) {
951 ret = -EINVAL;
952 test_msg("Miscount, wanted 1, got %u\n",
953 BTRFS_I(inode)->outstanding_extents);
954 goto out;
955 }
956
957 /* [BTRFS_MAX_EXTENT_SIZE][4k] */
958 BTRFS_I(inode)->outstanding_extents++;
959 ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE,
960 BTRFS_MAX_EXTENT_SIZE + 4095, NULL);
961 if (ret) {
962 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
963 goto out;
964 }
965 if (BTRFS_I(inode)->outstanding_extents != 2) {
966 ret = -EINVAL;
967 test_msg("Miscount, wanted 2, got %u\n",
968 BTRFS_I(inode)->outstanding_extents);
969 goto out;
970 }
971
972 /* [BTRFS_MAX_EXTENT_SIZE/2][4K HOLE][the rest] */
973 ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
974 BTRFS_MAX_EXTENT_SIZE >> 1,
975 (BTRFS_MAX_EXTENT_SIZE >> 1) + 4095,
976 EXTENT_DELALLOC | EXTENT_DIRTY |
977 EXTENT_UPTODATE | EXTENT_DO_ACCOUNTING, 0, 0,
978 NULL, GFP_KERNEL);
979 if (ret) {
980 test_msg("clear_extent_bit returned %d\n", ret);
981 goto out;
982 }
983 if (BTRFS_I(inode)->outstanding_extents != 2) {
984 ret = -EINVAL;
985 test_msg("Miscount, wanted 2, got %u\n",
986 BTRFS_I(inode)->outstanding_extents);
987 goto out;
988 }
989
990 /* [BTRFS_MAX_EXTENT_SIZE][4K] */
991 BTRFS_I(inode)->outstanding_extents++;
992 ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE >> 1,
993 (BTRFS_MAX_EXTENT_SIZE >> 1) + 4095,
994 NULL);
995 if (ret) {
996 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
997 goto out;
998 }
999 if (BTRFS_I(inode)->outstanding_extents != 2) {
1000 ret = -EINVAL;
1001 test_msg("Miscount, wanted 2, got %u\n",
1002 BTRFS_I(inode)->outstanding_extents);
1003 goto out;
1004 }
1005
1006 /*
1007 * [BTRFS_MAX_EXTENT_SIZE+4K][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4K]
1008 *
1009 * I'm artificially adding 2 to outstanding_extents because in the
1010 * buffered IO case we'd add things up as we go, but I don't feel like
1011 * doing that here, this isn't the interesting case we want to test.
1012 */
1013 BTRFS_I(inode)->outstanding_extents += 2;
1014 ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE + 8192,
1015 (BTRFS_MAX_EXTENT_SIZE << 1) + 12287,
1016 NULL);
1017 if (ret) {
1018 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
1019 goto out;
1020 }
1021 if (BTRFS_I(inode)->outstanding_extents != 4) {
1022 ret = -EINVAL;
1023 test_msg("Miscount, wanted 4, got %u\n",
1024 BTRFS_I(inode)->outstanding_extents);
1025 goto out;
1026 }
1027
1028 /* [BTRFS_MAX_EXTENT_SIZE+4k][4k][BTRFS_MAX_EXTENT_SIZE+4k] */
1029 BTRFS_I(inode)->outstanding_extents++;
1030 ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE+4096,
1031 BTRFS_MAX_EXTENT_SIZE+8191, NULL);
1032 if (ret) {
1033 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
1034 goto out;
1035 }
1036 if (BTRFS_I(inode)->outstanding_extents != 3) {
1037 ret = -EINVAL;
1038 test_msg("Miscount, wanted 3, got %u\n",
1039 BTRFS_I(inode)->outstanding_extents);
1040 goto out;
1041 }
1042
1043 /* [BTRFS_MAX_EXTENT_SIZE+4k][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4k] */
1044 ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
1045 BTRFS_MAX_EXTENT_SIZE+4096,
1046 BTRFS_MAX_EXTENT_SIZE+8191,
1047 EXTENT_DIRTY | EXTENT_DELALLOC |
1048 EXTENT_DO_ACCOUNTING | EXTENT_UPTODATE, 0, 0,
1049 NULL, GFP_KERNEL);
1050 if (ret) {
1051 test_msg("clear_extent_bit returned %d\n", ret);
1052 goto out;
1053 }
1054 if (BTRFS_I(inode)->outstanding_extents != 4) {
1055 ret = -EINVAL;
1056 test_msg("Miscount, wanted 4, got %u\n",
1057 BTRFS_I(inode)->outstanding_extents);
1058 goto out;
1059 }
1060
1061 /*
1062 * Refill the hole again just for good measure, because I thought it
1063 * might fail and I'd rather satisfy my paranoia at this point.
1064 */
1065 BTRFS_I(inode)->outstanding_extents++;
1066 ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE+4096,
1067 BTRFS_MAX_EXTENT_SIZE+8191, NULL);
1068 if (ret) {
1069 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
1070 goto out;
1071 }
1072 if (BTRFS_I(inode)->outstanding_extents != 3) {
1073 ret = -EINVAL;
1074 test_msg("Miscount, wanted 3, got %u\n",
1075 BTRFS_I(inode)->outstanding_extents);
1076 goto out;
1077 }
1078
1079 /* Empty */
1080 ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
1081 EXTENT_DIRTY | EXTENT_DELALLOC |
1082 EXTENT_DO_ACCOUNTING | EXTENT_UPTODATE, 0, 0,
1083 NULL, GFP_KERNEL);
1084 if (ret) {
1085 test_msg("clear_extent_bit returned %d\n", ret);
1086 goto out;
1087 }
1088 if (BTRFS_I(inode)->outstanding_extents) {
1089 ret = -EINVAL;
1090 test_msg("Miscount, wanted 0, got %u\n",
1091 BTRFS_I(inode)->outstanding_extents);
1092 goto out;
1093 }
1094 ret = 0;
1095out:
1096 if (ret)
1097 clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
1098 EXTENT_DIRTY | EXTENT_DELALLOC |
1099 EXTENT_DO_ACCOUNTING | EXTENT_UPTODATE, 0, 0,
1100 NULL, GFP_KERNEL);
1101 iput(inode);
1102 btrfs_free_dummy_root(root);
1103 return ret;
1104}
1105
1106int btrfs_test_inodes(void)
1107{
1108 int ret;
1109
1110 set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
1111 set_bit(EXTENT_FLAG_VACANCY, &vacancy_only);
1112 set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
1113
1114 test_msg("Running btrfs_get_extent tests\n");
1115 ret = test_btrfs_get_extent();
1116 if (ret)
1117 return ret;
1118 test_msg("Running hole first btrfs_get_extent test\n");
1119 ret = test_hole_first();
1120 if (ret)
1121 return ret;
1122 test_msg("Running outstanding_extents tests\n");
1123 return test_extent_accounting();
1124}