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