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19#include <linux/pagemap.h>
20#include <linux/sched.h>
21#include <linux/slab.h>
22#include <linux/sizes.h>
23#include "btrfs-tests.h"
24#include "../ctree.h"
25#include "../extent_io.h"
26
27#define PROCESS_UNLOCK (1 << 0)
28#define PROCESS_RELEASE (1 << 1)
29#define PROCESS_TEST_LOCKED (1 << 2)
30
31static noinline int process_page_range(struct inode *inode, u64 start, u64 end,
32 unsigned long flags)
33{
34 int ret;
35 struct page *pages[16];
36 unsigned long index = start >> PAGE_SHIFT;
37 unsigned long end_index = end >> PAGE_SHIFT;
38 unsigned long nr_pages = end_index - index + 1;
39 int i;
40 int count = 0;
41 int loops = 0;
42
43 while (nr_pages > 0) {
44 ret = find_get_pages_contig(inode->i_mapping, index,
45 min_t(unsigned long, nr_pages,
46 ARRAY_SIZE(pages)), pages);
47 for (i = 0; i < ret; i++) {
48 if (flags & PROCESS_TEST_LOCKED &&
49 !PageLocked(pages[i]))
50 count++;
51 if (flags & PROCESS_UNLOCK && PageLocked(pages[i]))
52 unlock_page(pages[i]);
53 put_page(pages[i]);
54 if (flags & PROCESS_RELEASE)
55 put_page(pages[i]);
56 }
57 nr_pages -= ret;
58 index += ret;
59 cond_resched();
60 loops++;
61 if (loops > 100000) {
62 printk(KERN_ERR "stuck in a loop, start %Lu, end %Lu, nr_pages %lu, ret %d\n", start, end, nr_pages, ret);
63 break;
64 }
65 }
66 return count;
67}
68
69static int test_find_delalloc(u32 sectorsize)
70{
71 struct inode *inode;
72 struct extent_io_tree tmp;
73 struct page *page;
74 struct page *locked_page = NULL;
75 unsigned long index = 0;
76 u64 total_dirty = SZ_256M;
77 u64 max_bytes = SZ_128M;
78 u64 start, end, test_start;
79 u64 found;
80 int ret = -EINVAL;
81
82 test_msg("Running find delalloc tests\n");
83
84 inode = btrfs_new_test_inode();
85 if (!inode) {
86 test_msg("Failed to allocate test inode\n");
87 return -ENOMEM;
88 }
89
90 extent_io_tree_init(&tmp, &inode->i_data);
91
92
93
94
95
96
97 for (index = 0; index < (total_dirty >> PAGE_SHIFT); index++) {
98 page = find_or_create_page(inode->i_mapping, index, GFP_KERNEL);
99 if (!page) {
100 test_msg("Failed to allocate test page\n");
101 ret = -ENOMEM;
102 goto out;
103 }
104 SetPageDirty(page);
105 if (index) {
106 unlock_page(page);
107 } else {
108 get_page(page);
109 locked_page = page;
110 }
111 }
112
113
114
115
116
117 set_extent_delalloc(&tmp, 0, sectorsize - 1, NULL);
118 start = 0;
119 end = 0;
120 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
121 &end, max_bytes);
122 if (!found) {
123 test_msg("Should have found at least one delalloc\n");
124 goto out_bits;
125 }
126 if (start != 0 || end != (sectorsize - 1)) {
127 test_msg("Expected start 0 end %u, got start %llu end %llu\n",
128 sectorsize - 1, start, end);
129 goto out_bits;
130 }
131 unlock_extent(&tmp, start, end);
132 unlock_page(locked_page);
133 put_page(locked_page);
134
135
136
137
138
139
140
141 test_start = SZ_64M;
142 locked_page = find_lock_page(inode->i_mapping,
143 test_start >> PAGE_SHIFT);
144 if (!locked_page) {
145 test_msg("Couldn't find the locked page\n");
146 goto out_bits;
147 }
148 set_extent_delalloc(&tmp, sectorsize, max_bytes - 1, NULL);
149 start = test_start;
150 end = 0;
151 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
152 &end, max_bytes);
153 if (!found) {
154 test_msg("Couldn't find delalloc in our range\n");
155 goto out_bits;
156 }
157 if (start != test_start || end != max_bytes - 1) {
158 test_msg("Expected start %Lu end %Lu, got start %Lu, end "
159 "%Lu\n", test_start, max_bytes - 1, start, end);
160 goto out_bits;
161 }
162 if (process_page_range(inode, start, end,
163 PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
164 test_msg("There were unlocked pages in the range\n");
165 goto out_bits;
166 }
167 unlock_extent(&tmp, start, end);
168
169 put_page(locked_page);
170
171
172
173
174
175
176 test_start = max_bytes + sectorsize;
177 locked_page = find_lock_page(inode->i_mapping, test_start >>
178 PAGE_SHIFT);
179 if (!locked_page) {
180 test_msg("Couldn't find the locked page\n");
181 goto out_bits;
182 }
183 start = test_start;
184 end = 0;
185 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
186 &end, max_bytes);
187 if (found) {
188 test_msg("Found range when we shouldn't have\n");
189 goto out_bits;
190 }
191 if (end != (u64)-1) {
192 test_msg("Did not return the proper end offset\n");
193 goto out_bits;
194 }
195
196
197
198
199
200
201
202
203 set_extent_delalloc(&tmp, max_bytes, total_dirty - 1, NULL);
204 start = test_start;
205 end = 0;
206 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
207 &end, max_bytes);
208 if (!found) {
209 test_msg("Didn't find our range\n");
210 goto out_bits;
211 }
212 if (start != test_start || end != total_dirty - 1) {
213 test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
214 test_start, total_dirty - 1, start, end);
215 goto out_bits;
216 }
217 if (process_page_range(inode, start, end,
218 PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
219 test_msg("Pages in range were not all locked\n");
220 goto out_bits;
221 }
222 unlock_extent(&tmp, start, end);
223
224
225
226
227
228 page = find_get_page(inode->i_mapping,
229 (max_bytes + SZ_1M) >> PAGE_SHIFT);
230 if (!page) {
231 test_msg("Couldn't find our page\n");
232 goto out_bits;
233 }
234 ClearPageDirty(page);
235 put_page(page);
236
237
238 lock_page(locked_page);
239 start = test_start;
240 end = 0;
241
242
243
244
245
246
247 found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
248 &end, max_bytes);
249 if (!found) {
250 test_msg("Didn't find our range\n");
251 goto out_bits;
252 }
253 if (start != test_start && end != test_start + PAGE_SIZE - 1) {
254 test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
255 test_start, test_start + PAGE_SIZE - 1, start,
256 end);
257 goto out_bits;
258 }
259 if (process_page_range(inode, start, end, PROCESS_TEST_LOCKED |
260 PROCESS_UNLOCK)) {
261 test_msg("Pages in range were not all locked\n");
262 goto out_bits;
263 }
264 ret = 0;
265out_bits:
266 clear_extent_bits(&tmp, 0, total_dirty - 1, (unsigned)-1);
267out:
268 if (locked_page)
269 put_page(locked_page);
270 process_page_range(inode, 0, total_dirty - 1,
271 PROCESS_UNLOCK | PROCESS_RELEASE);
272 iput(inode);
273 return ret;
274}
275
276static int check_eb_bitmap(unsigned long *bitmap, struct extent_buffer *eb,
277 unsigned long len)
278{
279 unsigned long i;
280
281 for (i = 0; i < len * BITS_PER_BYTE; i++) {
282 int bit, bit1;
283
284 bit = !!test_bit(i, bitmap);
285 bit1 = !!extent_buffer_test_bit(eb, 0, i);
286 if (bit1 != bit) {
287 test_msg("Bits do not match\n");
288 return -EINVAL;
289 }
290
291 bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
292 i % BITS_PER_BYTE);
293 if (bit1 != bit) {
294 test_msg("Offset bits do not match\n");
295 return -EINVAL;
296 }
297 }
298 return 0;
299}
300
301static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
302 unsigned long len)
303{
304 unsigned long i, j;
305 u32 x;
306 int ret;
307
308 memset(bitmap, 0, len);
309 memset_extent_buffer(eb, 0, 0, len);
310 if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
311 test_msg("Bitmap was not zeroed\n");
312 return -EINVAL;
313 }
314
315 bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
316 extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
317 ret = check_eb_bitmap(bitmap, eb, len);
318 if (ret) {
319 test_msg("Setting all bits failed\n");
320 return ret;
321 }
322
323 bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
324 extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
325 ret = check_eb_bitmap(bitmap, eb, len);
326 if (ret) {
327 test_msg("Clearing all bits failed\n");
328 return ret;
329 }
330
331
332 if (len > PAGE_SIZE) {
333 bitmap_set(bitmap,
334 (PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
335 sizeof(long) * BITS_PER_BYTE);
336 extent_buffer_bitmap_set(eb, PAGE_SIZE - sizeof(long) / 2, 0,
337 sizeof(long) * BITS_PER_BYTE);
338 ret = check_eb_bitmap(bitmap, eb, len);
339 if (ret) {
340 test_msg("Setting straddling pages failed\n");
341 return ret;
342 }
343
344 bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
345 bitmap_clear(bitmap,
346 (PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
347 sizeof(long) * BITS_PER_BYTE);
348 extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
349 extent_buffer_bitmap_clear(eb, PAGE_SIZE - sizeof(long) / 2, 0,
350 sizeof(long) * BITS_PER_BYTE);
351 ret = check_eb_bitmap(bitmap, eb, len);
352 if (ret) {
353 test_msg("Clearing straddling pages failed\n");
354 return ret;
355 }
356 }
357
358
359
360
361
362 x = 0;
363 bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
364 extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
365 for (i = 0; i < len * BITS_PER_BYTE / 32; i++) {
366 x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffU;
367 for (j = 0; j < 32; j++) {
368 if (x & (1U << j)) {
369 bitmap_set(bitmap, i * 32 + j, 1);
370 extent_buffer_bitmap_set(eb, 0, i * 32 + j, 1);
371 }
372 }
373 }
374
375 ret = check_eb_bitmap(bitmap, eb, len);
376 if (ret) {
377 test_msg("Random bit pattern failed\n");
378 return ret;
379 }
380
381 return 0;
382}
383
384static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
385{
386 unsigned long len;
387 unsigned long *bitmap;
388 struct extent_buffer *eb;
389 int ret;
390
391 test_msg("Running extent buffer bitmap tests\n");
392
393
394
395
396
397 len = (sectorsize < BTRFS_MAX_METADATA_BLOCKSIZE)
398 ? sectorsize * 4 : sectorsize;
399
400 bitmap = kmalloc(len, GFP_KERNEL);
401 if (!bitmap) {
402 test_msg("Couldn't allocate test bitmap\n");
403 return -ENOMEM;
404 }
405
406 eb = __alloc_dummy_extent_buffer(NULL, 0, len);
407 if (!eb) {
408 test_msg("Couldn't allocate test extent buffer\n");
409 kfree(bitmap);
410 return -ENOMEM;
411 }
412
413 ret = __test_eb_bitmaps(bitmap, eb, len);
414 if (ret)
415 goto out;
416
417
418 free_extent_buffer(eb);
419 eb = __alloc_dummy_extent_buffer(NULL, nodesize / 2, len);
420 if (!eb) {
421 test_msg("Couldn't allocate test extent buffer\n");
422 kfree(bitmap);
423 return -ENOMEM;
424 }
425
426 ret = __test_eb_bitmaps(bitmap, eb, len);
427out:
428 free_extent_buffer(eb);
429 kfree(bitmap);
430 return ret;
431}
432
433int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
434{
435 int ret;
436
437 test_msg("Running extent I/O tests\n");
438
439 ret = test_find_delalloc(sectorsize);
440 if (ret)
441 goto out;
442
443 ret = test_eb_bitmaps(sectorsize, nodesize);
444out:
445 test_msg("Extent I/O tests finished\n");
446 return ret;
447}
448
