blob: 646fe85261c17bcfb43ff89b54586838a00c39e7 [file] [log] [blame]
Kent Overstreetcafe5632013-03-23 16:11:31 -07001/*
2 * Code for working with individual keys, and sorted sets of keys with in a
3 * btree node
4 *
5 * Copyright 2012 Google, Inc.
6 */
7
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08008#define pr_fmt(fmt) "bcache: %s() " fmt "\n", __func__
9
10#include "util.h"
11#include "bset.h"
Kent Overstreetcafe5632013-03-23 16:11:31 -070012
Kent Overstreetdc9d98d2013-12-17 23:47:33 -080013#include <linux/console.h>
Kent Overstreetcafe5632013-03-23 16:11:31 -070014#include <linux/random.h>
Geert Uytterhoevencd953ed2013-03-27 18:56:28 +010015#include <linux/prefetch.h>
Kent Overstreetcafe5632013-03-23 16:11:31 -070016
Kent Overstreetdc9d98d2013-12-17 23:47:33 -080017#ifdef CONFIG_BCACHE_DEBUG
18
19void bch_dump_bset(struct btree_keys *b, struct bset *i, unsigned set)
20{
21 struct bkey *k, *next;
22
23 for (k = i->start; k < bset_bkey_last(i); k = next) {
24 next = bkey_next(k);
25
Kent Overstreet85cbe1f2014-02-17 13:44:06 -080026 printk(KERN_ERR "block %u key %u/%u: ", set,
27 (unsigned) ((u64 *) k - i->d), i->keys);
Kent Overstreetdc9d98d2013-12-17 23:47:33 -080028
29 if (b->ops->key_dump)
30 b->ops->key_dump(b, k);
31 else
32 printk("%llu:%llu\n", KEY_INODE(k), KEY_OFFSET(k));
33
34 if (next < bset_bkey_last(i) &&
35 bkey_cmp(k, b->ops->is_extents ?
36 &START_KEY(next) : next) > 0)
37 printk(KERN_ERR "Key skipped backwards\n");
38 }
39}
40
41void bch_dump_bucket(struct btree_keys *b)
42{
43 unsigned i;
44
45 console_lock();
46 for (i = 0; i <= b->nsets; i++)
47 bch_dump_bset(b, b->set[i].data,
48 bset_sector_offset(b, b->set[i].data));
49 console_unlock();
50}
51
52int __bch_count_data(struct btree_keys *b)
53{
54 unsigned ret = 0;
55 struct btree_iter iter;
56 struct bkey *k;
57
58 if (b->ops->is_extents)
59 for_each_key(b, k, &iter)
60 ret += KEY_SIZE(k);
61 return ret;
62}
63
64void __bch_check_keys(struct btree_keys *b, const char *fmt, ...)
65{
66 va_list args;
67 struct bkey *k, *p = NULL;
68 struct btree_iter iter;
69 const char *err;
70
71 for_each_key(b, k, &iter) {
72 if (b->ops->is_extents) {
73 err = "Keys out of order";
74 if (p && bkey_cmp(&START_KEY(p), &START_KEY(k)) > 0)
75 goto bug;
76
77 if (bch_ptr_invalid(b, k))
78 continue;
79
80 err = "Overlapping keys";
81 if (p && bkey_cmp(p, &START_KEY(k)) > 0)
82 goto bug;
83 } else {
84 if (bch_ptr_bad(b, k))
85 continue;
86
87 err = "Duplicate keys";
88 if (p && !bkey_cmp(p, k))
89 goto bug;
90 }
91 p = k;
92 }
93#if 0
94 err = "Key larger than btree node key";
95 if (p && bkey_cmp(p, &b->key) > 0)
96 goto bug;
97#endif
98 return;
99bug:
100 bch_dump_bucket(b);
101
102 va_start(args, fmt);
103 vprintk(fmt, args);
104 va_end(args);
105
106 panic("bch_check_keys error: %s:\n", err);
107}
108
109static void bch_btree_iter_next_check(struct btree_iter *iter)
110{
111 struct bkey *k = iter->data->k, *next = bkey_next(k);
112
113 if (next < iter->data->end &&
114 bkey_cmp(k, iter->b->ops->is_extents ?
115 &START_KEY(next) : next) > 0) {
116 bch_dump_bucket(iter->b);
117 panic("Key skipped backwards\n");
118 }
119}
120
121#else
122
123static inline void bch_btree_iter_next_check(struct btree_iter *iter) {}
124
125#endif
126
Kent Overstreetcafe5632013-03-23 16:11:31 -0700127/* Keylists */
128
Kent Overstreet085d2a32013-11-11 18:20:51 -0800129int __bch_keylist_realloc(struct keylist *l, unsigned u64s)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700130{
Kent Overstreetc2f95ae2013-07-24 17:24:25 -0700131 size_t oldsize = bch_keylist_nkeys(l);
Kent Overstreet085d2a32013-11-11 18:20:51 -0800132 size_t newsize = oldsize + u64s;
Kent Overstreetc2f95ae2013-07-24 17:24:25 -0700133 uint64_t *old_keys = l->keys_p == l->inline_keys ? NULL : l->keys_p;
134 uint64_t *new_keys;
Kent Overstreetcafe5632013-03-23 16:11:31 -0700135
Kent Overstreetcafe5632013-03-23 16:11:31 -0700136 newsize = roundup_pow_of_two(newsize);
137
138 if (newsize <= KEYLIST_INLINE ||
139 roundup_pow_of_two(oldsize) == newsize)
140 return 0;
141
Kent Overstreetc2f95ae2013-07-24 17:24:25 -0700142 new_keys = krealloc(old_keys, sizeof(uint64_t) * newsize, GFP_NOIO);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700143
Kent Overstreetc2f95ae2013-07-24 17:24:25 -0700144 if (!new_keys)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700145 return -ENOMEM;
146
Kent Overstreetc2f95ae2013-07-24 17:24:25 -0700147 if (!old_keys)
148 memcpy(new_keys, l->inline_keys, sizeof(uint64_t) * oldsize);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700149
Kent Overstreetc2f95ae2013-07-24 17:24:25 -0700150 l->keys_p = new_keys;
151 l->top_p = new_keys + oldsize;
Kent Overstreetcafe5632013-03-23 16:11:31 -0700152
153 return 0;
154}
155
156struct bkey *bch_keylist_pop(struct keylist *l)
157{
Kent Overstreetc2f95ae2013-07-24 17:24:25 -0700158 struct bkey *k = l->keys;
Kent Overstreetcafe5632013-03-23 16:11:31 -0700159
160 if (k == l->top)
161 return NULL;
162
163 while (bkey_next(k) != l->top)
164 k = bkey_next(k);
165
166 return l->top = k;
167}
168
Kent Overstreet26c949f2013-09-10 18:41:15 -0700169void bch_keylist_pop_front(struct keylist *l)
170{
Kent Overstreetc2f95ae2013-07-24 17:24:25 -0700171 l->top_p -= bkey_u64s(l->keys);
Kent Overstreet26c949f2013-09-10 18:41:15 -0700172
Kent Overstreetc2f95ae2013-07-24 17:24:25 -0700173 memmove(l->keys,
174 bkey_next(l->keys),
175 bch_keylist_bytes(l));
Kent Overstreet26c949f2013-09-10 18:41:15 -0700176}
177
Kent Overstreetcafe5632013-03-23 16:11:31 -0700178/* Key/pointer manipulation */
179
180void bch_bkey_copy_single_ptr(struct bkey *dest, const struct bkey *src,
181 unsigned i)
182{
183 BUG_ON(i > KEY_PTRS(src));
184
185 /* Only copy the header, key, and one pointer. */
186 memcpy(dest, src, 2 * sizeof(uint64_t));
187 dest->ptr[0] = src->ptr[i];
188 SET_KEY_PTRS(dest, 1);
189 /* We didn't copy the checksum so clear that bit. */
190 SET_KEY_CSUM(dest, 0);
191}
192
193bool __bch_cut_front(const struct bkey *where, struct bkey *k)
194{
195 unsigned i, len = 0;
196
197 if (bkey_cmp(where, &START_KEY(k)) <= 0)
198 return false;
199
200 if (bkey_cmp(where, k) < 0)
201 len = KEY_OFFSET(k) - KEY_OFFSET(where);
202 else
203 bkey_copy_key(k, where);
204
205 for (i = 0; i < KEY_PTRS(k); i++)
206 SET_PTR_OFFSET(k, i, PTR_OFFSET(k, i) + KEY_SIZE(k) - len);
207
208 BUG_ON(len > KEY_SIZE(k));
209 SET_KEY_SIZE(k, len);
210 return true;
211}
212
213bool __bch_cut_back(const struct bkey *where, struct bkey *k)
214{
215 unsigned len = 0;
216
217 if (bkey_cmp(where, k) >= 0)
218 return false;
219
220 BUG_ON(KEY_INODE(where) != KEY_INODE(k));
221
222 if (bkey_cmp(where, &START_KEY(k)) > 0)
223 len = KEY_OFFSET(where) - KEY_START(k);
224
225 bkey_copy_key(k, where);
226
227 BUG_ON(len > KEY_SIZE(k));
228 SET_KEY_SIZE(k, len);
229 return true;
230}
231
Kent Overstreetee811282013-12-17 23:49:49 -0800232/* Auxiliary search trees */
233
234/* 32 bits total: */
235#define BKEY_MID_BITS 3
236#define BKEY_EXPONENT_BITS 7
237#define BKEY_MANTISSA_BITS (32 - BKEY_MID_BITS - BKEY_EXPONENT_BITS)
238#define BKEY_MANTISSA_MASK ((1 << BKEY_MANTISSA_BITS) - 1)
239
240struct bkey_float {
241 unsigned exponent:BKEY_EXPONENT_BITS;
242 unsigned m:BKEY_MID_BITS;
243 unsigned mantissa:BKEY_MANTISSA_BITS;
244} __packed;
245
246/*
247 * BSET_CACHELINE was originally intended to match the hardware cacheline size -
248 * it used to be 64, but I realized the lookup code would touch slightly less
249 * memory if it was 128.
250 *
251 * It definites the number of bytes (in struct bset) per struct bkey_float in
252 * the auxiliar search tree - when we're done searching the bset_float tree we
253 * have this many bytes left that we do a linear search over.
254 *
255 * Since (after level 5) every level of the bset_tree is on a new cacheline,
256 * we're touching one fewer cacheline in the bset tree in exchange for one more
257 * cacheline in the linear search - but the linear search might stop before it
258 * gets to the second cacheline.
259 */
260
261#define BSET_CACHELINE 128
262
263/* Space required for the btree node keys */
Kent Overstreeta85e9682013-12-20 17:28:16 -0800264static inline size_t btree_keys_bytes(struct btree_keys *b)
Kent Overstreetee811282013-12-17 23:49:49 -0800265{
266 return PAGE_SIZE << b->page_order;
267}
268
Kent Overstreeta85e9682013-12-20 17:28:16 -0800269static inline size_t btree_keys_cachelines(struct btree_keys *b)
Kent Overstreetee811282013-12-17 23:49:49 -0800270{
271 return btree_keys_bytes(b) / BSET_CACHELINE;
272}
273
274/* Space required for the auxiliary search trees */
Kent Overstreeta85e9682013-12-20 17:28:16 -0800275static inline size_t bset_tree_bytes(struct btree_keys *b)
Kent Overstreetee811282013-12-17 23:49:49 -0800276{
277 return btree_keys_cachelines(b) * sizeof(struct bkey_float);
278}
279
280/* Space required for the prev pointers */
Kent Overstreeta85e9682013-12-20 17:28:16 -0800281static inline size_t bset_prev_bytes(struct btree_keys *b)
Kent Overstreetee811282013-12-17 23:49:49 -0800282{
283 return btree_keys_cachelines(b) * sizeof(uint8_t);
284}
285
286/* Memory allocation */
287
Kent Overstreeta85e9682013-12-20 17:28:16 -0800288void bch_btree_keys_free(struct btree_keys *b)
Kent Overstreetee811282013-12-17 23:49:49 -0800289{
Kent Overstreeta85e9682013-12-20 17:28:16 -0800290 struct bset_tree *t = b->set;
Kent Overstreetee811282013-12-17 23:49:49 -0800291
292 if (bset_prev_bytes(b) < PAGE_SIZE)
293 kfree(t->prev);
294 else
295 free_pages((unsigned long) t->prev,
296 get_order(bset_prev_bytes(b)));
297
298 if (bset_tree_bytes(b) < PAGE_SIZE)
299 kfree(t->tree);
300 else
301 free_pages((unsigned long) t->tree,
302 get_order(bset_tree_bytes(b)));
303
304 free_pages((unsigned long) t->data, b->page_order);
305
306 t->prev = NULL;
307 t->tree = NULL;
308 t->data = NULL;
309}
Kent Overstreeta85e9682013-12-20 17:28:16 -0800310EXPORT_SYMBOL(bch_btree_keys_free);
Kent Overstreetee811282013-12-17 23:49:49 -0800311
Kent Overstreeta85e9682013-12-20 17:28:16 -0800312int bch_btree_keys_alloc(struct btree_keys *b, unsigned page_order, gfp_t gfp)
Kent Overstreetee811282013-12-17 23:49:49 -0800313{
Kent Overstreeta85e9682013-12-20 17:28:16 -0800314 struct bset_tree *t = b->set;
Kent Overstreetee811282013-12-17 23:49:49 -0800315
316 BUG_ON(t->data);
317
318 b->page_order = page_order;
319
320 t->data = (void *) __get_free_pages(gfp, b->page_order);
321 if (!t->data)
322 goto err;
323
324 t->tree = bset_tree_bytes(b) < PAGE_SIZE
325 ? kmalloc(bset_tree_bytes(b), gfp)
326 : (void *) __get_free_pages(gfp, get_order(bset_tree_bytes(b)));
327 if (!t->tree)
328 goto err;
329
330 t->prev = bset_prev_bytes(b) < PAGE_SIZE
331 ? kmalloc(bset_prev_bytes(b), gfp)
332 : (void *) __get_free_pages(gfp, get_order(bset_prev_bytes(b)));
333 if (!t->prev)
334 goto err;
335
336 return 0;
337err:
338 bch_btree_keys_free(b);
339 return -ENOMEM;
340}
Kent Overstreeta85e9682013-12-20 17:28:16 -0800341EXPORT_SYMBOL(bch_btree_keys_alloc);
342
343void bch_btree_keys_init(struct btree_keys *b, const struct btree_keys_ops *ops,
344 bool *expensive_debug_checks)
345{
346 unsigned i;
347
348 b->ops = ops;
349 b->expensive_debug_checks = expensive_debug_checks;
350 b->nsets = 0;
351 b->last_set_unwritten = 0;
352
353 /* XXX: shouldn't be needed */
354 for (i = 0; i < MAX_BSETS; i++)
355 b->set[i].size = 0;
356 /*
357 * Second loop starts at 1 because b->keys[0]->data is the memory we
358 * allocated
359 */
360 for (i = 1; i < MAX_BSETS; i++)
361 b->set[i].data = NULL;
362}
363EXPORT_SYMBOL(bch_btree_keys_init);
Kent Overstreetee811282013-12-17 23:49:49 -0800364
Kent Overstreetcafe5632013-03-23 16:11:31 -0700365/* Binary tree stuff for auxiliary search trees */
366
367static unsigned inorder_next(unsigned j, unsigned size)
368{
369 if (j * 2 + 1 < size) {
370 j = j * 2 + 1;
371
372 while (j * 2 < size)
373 j *= 2;
374 } else
375 j >>= ffz(j) + 1;
376
377 return j;
378}
379
380static unsigned inorder_prev(unsigned j, unsigned size)
381{
382 if (j * 2 < size) {
383 j = j * 2;
384
385 while (j * 2 + 1 < size)
386 j = j * 2 + 1;
387 } else
388 j >>= ffs(j);
389
390 return j;
391}
392
393/* I have no idea why this code works... and I'm the one who wrote it
394 *
395 * However, I do know what it does:
396 * Given a binary tree constructed in an array (i.e. how you normally implement
397 * a heap), it converts a node in the tree - referenced by array index - to the
398 * index it would have if you did an inorder traversal.
399 *
400 * Also tested for every j, size up to size somewhere around 6 million.
401 *
402 * The binary tree starts at array index 1, not 0
403 * extra is a function of size:
404 * extra = (size - rounddown_pow_of_two(size - 1)) << 1;
405 */
406static unsigned __to_inorder(unsigned j, unsigned size, unsigned extra)
407{
408 unsigned b = fls(j);
409 unsigned shift = fls(size - 1) - b;
410
411 j ^= 1U << (b - 1);
412 j <<= 1;
413 j |= 1;
414 j <<= shift;
415
416 if (j > extra)
417 j -= (j - extra) >> 1;
418
419 return j;
420}
421
422static unsigned to_inorder(unsigned j, struct bset_tree *t)
423{
424 return __to_inorder(j, t->size, t->extra);
425}
426
427static unsigned __inorder_to_tree(unsigned j, unsigned size, unsigned extra)
428{
429 unsigned shift;
430
431 if (j > extra)
432 j += j - extra;
433
434 shift = ffs(j);
435
436 j >>= shift;
437 j |= roundup_pow_of_two(size) >> shift;
438
439 return j;
440}
441
442static unsigned inorder_to_tree(unsigned j, struct bset_tree *t)
443{
444 return __inorder_to_tree(j, t->size, t->extra);
445}
446
447#if 0
448void inorder_test(void)
449{
450 unsigned long done = 0;
451 ktime_t start = ktime_get();
452
453 for (unsigned size = 2;
454 size < 65536000;
455 size++) {
456 unsigned extra = (size - rounddown_pow_of_two(size - 1)) << 1;
457 unsigned i = 1, j = rounddown_pow_of_two(size - 1);
458
459 if (!(size % 4096))
460 printk(KERN_NOTICE "loop %u, %llu per us\n", size,
461 done / ktime_us_delta(ktime_get(), start));
462
463 while (1) {
464 if (__inorder_to_tree(i, size, extra) != j)
465 panic("size %10u j %10u i %10u", size, j, i);
466
467 if (__to_inorder(j, size, extra) != i)
468 panic("size %10u j %10u i %10u", size, j, i);
469
470 if (j == rounddown_pow_of_two(size) - 1)
471 break;
472
473 BUG_ON(inorder_prev(inorder_next(j, size), size) != j);
474
475 j = inorder_next(j, size);
476 i++;
477 }
478
479 done += size - 1;
480 }
481}
482#endif
483
484/*
Phil Viana48a73022013-06-03 09:51:42 -0300485 * Cacheline/offset <-> bkey pointer arithmetic:
Kent Overstreetcafe5632013-03-23 16:11:31 -0700486 *
487 * t->tree is a binary search tree in an array; each node corresponds to a key
488 * in one cacheline in t->set (BSET_CACHELINE bytes).
489 *
490 * This means we don't have to store the full index of the key that a node in
491 * the binary tree points to; to_inorder() gives us the cacheline, and then
492 * bkey_float->m gives us the offset within that cacheline, in units of 8 bytes.
493 *
Phil Viana48a73022013-06-03 09:51:42 -0300494 * cacheline_to_bkey() and friends abstract out all the pointer arithmetic to
Kent Overstreetcafe5632013-03-23 16:11:31 -0700495 * make this work.
496 *
497 * To construct the bfloat for an arbitrary key we need to know what the key
498 * immediately preceding it is: we have to check if the two keys differ in the
499 * bits we're going to store in bkey_float->mantissa. t->prev[j] stores the size
500 * of the previous key so we can walk backwards to it from t->tree[j]'s key.
501 */
502
503static struct bkey *cacheline_to_bkey(struct bset_tree *t, unsigned cacheline,
504 unsigned offset)
505{
506 return ((void *) t->data) + cacheline * BSET_CACHELINE + offset * 8;
507}
508
509static unsigned bkey_to_cacheline(struct bset_tree *t, struct bkey *k)
510{
511 return ((void *) k - (void *) t->data) / BSET_CACHELINE;
512}
513
Kent Overstreet9dd63582013-12-17 03:11:06 -0800514static unsigned bkey_to_cacheline_offset(struct bset_tree *t,
515 unsigned cacheline,
516 struct bkey *k)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700517{
Kent Overstreet9dd63582013-12-17 03:11:06 -0800518 return (u64 *) k - (u64 *) cacheline_to_bkey(t, cacheline, 0);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700519}
520
521static struct bkey *tree_to_bkey(struct bset_tree *t, unsigned j)
522{
523 return cacheline_to_bkey(t, to_inorder(j, t), t->tree[j].m);
524}
525
526static struct bkey *tree_to_prev_bkey(struct bset_tree *t, unsigned j)
527{
528 return (void *) (((uint64_t *) tree_to_bkey(t, j)) - t->prev[j]);
529}
530
531/*
532 * For the write set - the one we're currently inserting keys into - we don't
533 * maintain a full search tree, we just keep a simple lookup table in t->prev.
534 */
535static struct bkey *table_to_bkey(struct bset_tree *t, unsigned cacheline)
536{
537 return cacheline_to_bkey(t, cacheline, t->prev[cacheline]);
538}
539
540static inline uint64_t shrd128(uint64_t high, uint64_t low, uint8_t shift)
541{
Kent Overstreetcafe5632013-03-23 16:11:31 -0700542 low >>= shift;
543 low |= (high << 1) << (63U - shift);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700544 return low;
545}
546
547static inline unsigned bfloat_mantissa(const struct bkey *k,
548 struct bkey_float *f)
549{
550 const uint64_t *p = &k->low - (f->exponent >> 6);
551 return shrd128(p[-1], p[0], f->exponent & 63) & BKEY_MANTISSA_MASK;
552}
553
554static void make_bfloat(struct bset_tree *t, unsigned j)
555{
556 struct bkey_float *f = &t->tree[j];
557 struct bkey *m = tree_to_bkey(t, j);
558 struct bkey *p = tree_to_prev_bkey(t, j);
559
560 struct bkey *l = is_power_of_2(j)
561 ? t->data->start
562 : tree_to_prev_bkey(t, j >> ffs(j));
563
564 struct bkey *r = is_power_of_2(j + 1)
Kent Overstreetfafff812013-12-17 21:56:21 -0800565 ? bset_bkey_idx(t->data, t->data->keys - bkey_u64s(&t->end))
Kent Overstreetcafe5632013-03-23 16:11:31 -0700566 : tree_to_bkey(t, j >> (ffz(j) + 1));
567
568 BUG_ON(m < l || m > r);
569 BUG_ON(bkey_next(p) != m);
570
571 if (KEY_INODE(l) != KEY_INODE(r))
572 f->exponent = fls64(KEY_INODE(r) ^ KEY_INODE(l)) + 64;
573 else
574 f->exponent = fls64(r->low ^ l->low);
575
576 f->exponent = max_t(int, f->exponent - BKEY_MANTISSA_BITS, 0);
577
578 /*
579 * Setting f->exponent = 127 flags this node as failed, and causes the
580 * lookup code to fall back to comparing against the original key.
581 */
582
583 if (bfloat_mantissa(m, f) != bfloat_mantissa(p, f))
584 f->mantissa = bfloat_mantissa(m, f) - 1;
585 else
586 f->exponent = 127;
587}
588
Kent Overstreeta85e9682013-12-20 17:28:16 -0800589static void bset_alloc_tree(struct btree_keys *b, struct bset_tree *t)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700590{
Kent Overstreeta85e9682013-12-20 17:28:16 -0800591 if (t != b->set) {
Kent Overstreetcafe5632013-03-23 16:11:31 -0700592 unsigned j = roundup(t[-1].size,
593 64 / sizeof(struct bkey_float));
594
595 t->tree = t[-1].tree + j;
596 t->prev = t[-1].prev + j;
597 }
598
Kent Overstreeta85e9682013-12-20 17:28:16 -0800599 while (t < b->set + MAX_BSETS)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700600 t++->size = 0;
601}
602
Kent Overstreeta85e9682013-12-20 17:28:16 -0800603static void bch_bset_build_unwritten_tree(struct btree_keys *b)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700604{
Kent Overstreetee811282013-12-17 23:49:49 -0800605 struct bset_tree *t = bset_tree_last(b);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700606
Kent Overstreeta85e9682013-12-20 17:28:16 -0800607 BUG_ON(b->last_set_unwritten);
608 b->last_set_unwritten = 1;
609
Kent Overstreetcafe5632013-03-23 16:11:31 -0700610 bset_alloc_tree(b, t);
611
Kent Overstreeta85e9682013-12-20 17:28:16 -0800612 if (t->tree != b->set->tree + btree_keys_cachelines(b)) {
Kent Overstreet9dd63582013-12-17 03:11:06 -0800613 t->prev[0] = bkey_to_cacheline_offset(t, 0, t->data->start);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700614 t->size = 1;
615 }
616}
617
Kent Overstreeta85e9682013-12-20 17:28:16 -0800618void bch_bset_init_next(struct btree_keys *b, struct bset *i, uint64_t magic)
Kent Overstreetee811282013-12-17 23:49:49 -0800619{
Kent Overstreeta85e9682013-12-20 17:28:16 -0800620 if (i != b->set->data) {
621 b->set[++b->nsets].data = i;
622 i->seq = b->set->data->seq;
Kent Overstreetee811282013-12-17 23:49:49 -0800623 } else
624 get_random_bytes(&i->seq, sizeof(uint64_t));
625
626 i->magic = magic;
627 i->version = 0;
628 i->keys = 0;
629
630 bch_bset_build_unwritten_tree(b);
631}
Kent Overstreeta85e9682013-12-20 17:28:16 -0800632EXPORT_SYMBOL(bch_bset_init_next);
Kent Overstreetee811282013-12-17 23:49:49 -0800633
Kent Overstreeta85e9682013-12-20 17:28:16 -0800634void bch_bset_build_written_tree(struct btree_keys *b)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700635{
Kent Overstreetee811282013-12-17 23:49:49 -0800636 struct bset_tree *t = bset_tree_last(b);
Kent Overstreet9dd63582013-12-17 03:11:06 -0800637 struct bkey *prev = NULL, *k = t->data->start;
Kent Overstreetcafe5632013-03-23 16:11:31 -0700638 unsigned j, cacheline = 1;
639
Kent Overstreeta85e9682013-12-20 17:28:16 -0800640 b->last_set_unwritten = 0;
641
Kent Overstreetcafe5632013-03-23 16:11:31 -0700642 bset_alloc_tree(b, t);
643
644 t->size = min_t(unsigned,
Kent Overstreetfafff812013-12-17 21:56:21 -0800645 bkey_to_cacheline(t, bset_bkey_last(t->data)),
Kent Overstreeta85e9682013-12-20 17:28:16 -0800646 b->set->tree + btree_keys_cachelines(b) - t->tree);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700647
648 if (t->size < 2) {
649 t->size = 0;
650 return;
651 }
652
653 t->extra = (t->size - rounddown_pow_of_two(t->size - 1)) << 1;
654
655 /* First we figure out where the first key in each cacheline is */
656 for (j = inorder_next(0, t->size);
657 j;
658 j = inorder_next(j, t->size)) {
Kent Overstreet9dd63582013-12-17 03:11:06 -0800659 while (bkey_to_cacheline(t, k) < cacheline)
660 prev = k, k = bkey_next(k);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700661
Kent Overstreet9dd63582013-12-17 03:11:06 -0800662 t->prev[j] = bkey_u64s(prev);
663 t->tree[j].m = bkey_to_cacheline_offset(t, cacheline++, k);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700664 }
665
Kent Overstreetfafff812013-12-17 21:56:21 -0800666 while (bkey_next(k) != bset_bkey_last(t->data))
Kent Overstreetcafe5632013-03-23 16:11:31 -0700667 k = bkey_next(k);
668
669 t->end = *k;
670
671 /* Then we build the tree */
672 for (j = inorder_next(0, t->size);
673 j;
674 j = inorder_next(j, t->size))
675 make_bfloat(t, j);
676}
Kent Overstreeta85e9682013-12-20 17:28:16 -0800677EXPORT_SYMBOL(bch_bset_build_written_tree);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700678
Kent Overstreet829a60b2013-11-11 17:02:31 -0800679/* Insert */
680
Kent Overstreeta85e9682013-12-20 17:28:16 -0800681void bch_bset_fix_invalidated_key(struct btree_keys *b, struct bkey *k)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700682{
683 struct bset_tree *t;
684 unsigned inorder, j = 1;
685
Kent Overstreeta85e9682013-12-20 17:28:16 -0800686 for (t = b->set; t <= bset_tree_last(b); t++)
Kent Overstreetfafff812013-12-17 21:56:21 -0800687 if (k < bset_bkey_last(t->data))
Kent Overstreetcafe5632013-03-23 16:11:31 -0700688 goto found_set;
689
690 BUG();
691found_set:
692 if (!t->size || !bset_written(b, t))
693 return;
694
695 inorder = bkey_to_cacheline(t, k);
696
697 if (k == t->data->start)
698 goto fix_left;
699
Kent Overstreetfafff812013-12-17 21:56:21 -0800700 if (bkey_next(k) == bset_bkey_last(t->data)) {
Kent Overstreetcafe5632013-03-23 16:11:31 -0700701 t->end = *k;
702 goto fix_right;
703 }
704
705 j = inorder_to_tree(inorder, t);
706
707 if (j &&
708 j < t->size &&
709 k == tree_to_bkey(t, j))
710fix_left: do {
711 make_bfloat(t, j);
712 j = j * 2;
713 } while (j < t->size);
714
715 j = inorder_to_tree(inorder + 1, t);
716
717 if (j &&
718 j < t->size &&
719 k == tree_to_prev_bkey(t, j))
720fix_right: do {
721 make_bfloat(t, j);
722 j = j * 2 + 1;
723 } while (j < t->size);
724}
Kent Overstreeta85e9682013-12-20 17:28:16 -0800725EXPORT_SYMBOL(bch_bset_fix_invalidated_key);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700726
Kent Overstreeta85e9682013-12-20 17:28:16 -0800727static void bch_bset_fix_lookup_table(struct btree_keys *b,
Kent Overstreetee811282013-12-17 23:49:49 -0800728 struct bset_tree *t,
729 struct bkey *k)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700730{
Kent Overstreetcafe5632013-03-23 16:11:31 -0700731 unsigned shift = bkey_u64s(k);
732 unsigned j = bkey_to_cacheline(t, k);
733
734 /* We're getting called from btree_split() or btree_gc, just bail out */
735 if (!t->size)
736 return;
737
738 /* k is the key we just inserted; we need to find the entry in the
739 * lookup table for the first key that is strictly greater than k:
740 * it's either k's cacheline or the next one
741 */
Kent Overstreet9dd63582013-12-17 03:11:06 -0800742 while (j < t->size &&
743 table_to_bkey(t, j) <= k)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700744 j++;
745
746 /* Adjust all the lookup table entries, and find a new key for any that
747 * have gotten too big
748 */
749 for (; j < t->size; j++) {
750 t->prev[j] += shift;
751
752 if (t->prev[j] > 7) {
753 k = table_to_bkey(t, j - 1);
754
755 while (k < cacheline_to_bkey(t, j, 0))
756 k = bkey_next(k);
757
Kent Overstreet9dd63582013-12-17 03:11:06 -0800758 t->prev[j] = bkey_to_cacheline_offset(t, j, k);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700759 }
760 }
761
Kent Overstreeta85e9682013-12-20 17:28:16 -0800762 if (t->size == b->set->tree + btree_keys_cachelines(b) - t->tree)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700763 return;
764
765 /* Possibly add a new entry to the end of the lookup table */
766
767 for (k = table_to_bkey(t, t->size - 1);
Kent Overstreetfafff812013-12-17 21:56:21 -0800768 k != bset_bkey_last(t->data);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700769 k = bkey_next(k))
770 if (t->size == bkey_to_cacheline(t, k)) {
Kent Overstreet9dd63582013-12-17 03:11:06 -0800771 t->prev[t->size] = bkey_to_cacheline_offset(t, t->size, k);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700772 t->size++;
773 }
774}
775
Nicholas Swenson0f49cf32013-10-14 18:53:16 -0700776/*
777 * Tries to merge l and r: l should be lower than r
778 * Returns true if we were able to merge. If we did merge, l will be the merged
779 * key, r will be untouched.
780 */
781bool bch_bkey_try_merge(struct btree_keys *b, struct bkey *l, struct bkey *r)
782{
783 if (!b->ops->key_merge)
784 return false;
785
786 /*
787 * Generic header checks
788 * Assumes left and right are in order
789 * Left and right must be exactly aligned
790 */
Nicholas Swenson3bdad1e2013-11-11 19:36:25 -0800791 if (!bch_bkey_equal_header(l, r) ||
792 bkey_cmp(l, &START_KEY(r)))
Nicholas Swenson0f49cf32013-10-14 18:53:16 -0700793 return false;
794
795 return b->ops->key_merge(b, l, r);
796}
797EXPORT_SYMBOL(bch_bkey_try_merge);
798
Kent Overstreeta85e9682013-12-20 17:28:16 -0800799void bch_bset_insert(struct btree_keys *b, struct bkey *where,
Kent Overstreetee811282013-12-17 23:49:49 -0800800 struct bkey *insert)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700801{
Kent Overstreetee811282013-12-17 23:49:49 -0800802 struct bset_tree *t = bset_tree_last(b);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700803
Kent Overstreeta85e9682013-12-20 17:28:16 -0800804 BUG_ON(!b->last_set_unwritten);
Kent Overstreetee811282013-12-17 23:49:49 -0800805 BUG_ON(bset_byte_offset(b, t->data) +
806 __set_bytes(t->data, t->data->keys + bkey_u64s(insert)) >
807 PAGE_SIZE << b->page_order);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700808
Kent Overstreetee811282013-12-17 23:49:49 -0800809 memmove((uint64_t *) where + bkey_u64s(insert),
810 where,
811 (void *) bset_bkey_last(t->data) - (void *) where);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700812
Kent Overstreetee811282013-12-17 23:49:49 -0800813 t->data->keys += bkey_u64s(insert);
814 bkey_copy(where, insert);
815 bch_bset_fix_lookup_table(b, t, where);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700816}
Kent Overstreeta85e9682013-12-20 17:28:16 -0800817EXPORT_SYMBOL(bch_bset_insert);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700818
Kent Overstreet829a60b2013-11-11 17:02:31 -0800819unsigned bch_btree_insert_key(struct btree_keys *b, struct bkey *k,
820 struct bkey *replace_key)
821{
822 unsigned status = BTREE_INSERT_STATUS_NO_INSERT;
823 struct bset *i = bset_tree_last(b)->data;
824 struct bkey *m, *prev = NULL;
825 struct btree_iter iter;
826
827 BUG_ON(b->ops->is_extents && !KEY_SIZE(k));
828
829 m = bch_btree_iter_init(b, &iter, b->ops->is_extents
830 ? PRECEDING_KEY(&START_KEY(k))
831 : PRECEDING_KEY(k));
832
833 if (b->ops->insert_fixup(b, k, &iter, replace_key))
834 return status;
835
836 status = BTREE_INSERT_STATUS_INSERT;
837
838 while (m != bset_bkey_last(i) &&
839 bkey_cmp(k, b->ops->is_extents ? &START_KEY(m) : m) > 0)
840 prev = m, m = bkey_next(m);
841
842 /* prev is in the tree, if we merge we're done */
843 status = BTREE_INSERT_STATUS_BACK_MERGE;
844 if (prev &&
845 bch_bkey_try_merge(b, prev, k))
846 goto merged;
847#if 0
848 status = BTREE_INSERT_STATUS_OVERWROTE;
849 if (m != bset_bkey_last(i) &&
850 KEY_PTRS(m) == KEY_PTRS(k) && !KEY_SIZE(m))
851 goto copy;
852#endif
853 status = BTREE_INSERT_STATUS_FRONT_MERGE;
854 if (m != bset_bkey_last(i) &&
855 bch_bkey_try_merge(b, k, m))
856 goto copy;
857
858 bch_bset_insert(b, m, k);
859copy: bkey_copy(m, k);
860merged:
861 return status;
862}
863EXPORT_SYMBOL(bch_btree_insert_key);
864
865/* Lookup */
866
Kent Overstreetcafe5632013-03-23 16:11:31 -0700867struct bset_search_iter {
868 struct bkey *l, *r;
869};
870
Kent Overstreeta85e9682013-12-20 17:28:16 -0800871static struct bset_search_iter bset_search_write_set(struct bset_tree *t,
Kent Overstreetcafe5632013-03-23 16:11:31 -0700872 const struct bkey *search)
873{
874 unsigned li = 0, ri = t->size;
875
Kent Overstreetcafe5632013-03-23 16:11:31 -0700876 while (li + 1 != ri) {
877 unsigned m = (li + ri) >> 1;
878
879 if (bkey_cmp(table_to_bkey(t, m), search) > 0)
880 ri = m;
881 else
882 li = m;
883 }
884
885 return (struct bset_search_iter) {
886 table_to_bkey(t, li),
Kent Overstreetfafff812013-12-17 21:56:21 -0800887 ri < t->size ? table_to_bkey(t, ri) : bset_bkey_last(t->data)
Kent Overstreetcafe5632013-03-23 16:11:31 -0700888 };
889}
890
Kent Overstreeta85e9682013-12-20 17:28:16 -0800891static struct bset_search_iter bset_search_tree(struct bset_tree *t,
Kent Overstreetcafe5632013-03-23 16:11:31 -0700892 const struct bkey *search)
893{
894 struct bkey *l, *r;
895 struct bkey_float *f;
896 unsigned inorder, j, n = 1;
897
898 do {
899 unsigned p = n << 4;
900 p &= ((int) (p - t->size)) >> 31;
901
902 prefetch(&t->tree[p]);
903
904 j = n;
905 f = &t->tree[j];
906
907 /*
908 * n = (f->mantissa > bfloat_mantissa())
909 * ? j * 2
910 * : j * 2 + 1;
911 *
912 * We need to subtract 1 from f->mantissa for the sign bit trick
913 * to work - that's done in make_bfloat()
914 */
915 if (likely(f->exponent != 127))
916 n = j * 2 + (((unsigned)
917 (f->mantissa -
918 bfloat_mantissa(search, f))) >> 31);
919 else
920 n = (bkey_cmp(tree_to_bkey(t, j), search) > 0)
921 ? j * 2
922 : j * 2 + 1;
923 } while (n < t->size);
924
925 inorder = to_inorder(j, t);
926
927 /*
928 * n would have been the node we recursed to - the low bit tells us if
929 * we recursed left or recursed right.
930 */
931 if (n & 1) {
932 l = cacheline_to_bkey(t, inorder, f->m);
933
934 if (++inorder != t->size) {
935 f = &t->tree[inorder_next(j, t->size)];
936 r = cacheline_to_bkey(t, inorder, f->m);
937 } else
Kent Overstreetfafff812013-12-17 21:56:21 -0800938 r = bset_bkey_last(t->data);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700939 } else {
940 r = cacheline_to_bkey(t, inorder, f->m);
941
942 if (--inorder) {
943 f = &t->tree[inorder_prev(j, t->size)];
944 l = cacheline_to_bkey(t, inorder, f->m);
945 } else
946 l = t->data->start;
947 }
948
949 return (struct bset_search_iter) {l, r};
950}
951
Kent Overstreetc052dd92013-11-11 17:35:24 -0800952struct bkey *__bch_bset_search(struct btree_keys *b, struct bset_tree *t,
Kent Overstreetcafe5632013-03-23 16:11:31 -0700953 const struct bkey *search)
954{
955 struct bset_search_iter i;
956
957 /*
958 * First, we search for a cacheline, then lastly we do a linear search
959 * within that cacheline.
960 *
961 * To search for the cacheline, there's three different possibilities:
962 * * The set is too small to have a search tree, so we just do a linear
963 * search over the whole set.
964 * * The set is the one we're currently inserting into; keeping a full
965 * auxiliary search tree up to date would be too expensive, so we
966 * use a much simpler lookup table to do a binary search -
967 * bset_search_write_set().
968 * * Or we use the auxiliary search tree we constructed earlier -
969 * bset_search_tree()
970 */
971
972 if (unlikely(!t->size)) {
973 i.l = t->data->start;
Kent Overstreetfafff812013-12-17 21:56:21 -0800974 i.r = bset_bkey_last(t->data);
Kent Overstreetc052dd92013-11-11 17:35:24 -0800975 } else if (bset_written(b, t)) {
Kent Overstreetcafe5632013-03-23 16:11:31 -0700976 /*
977 * Each node in the auxiliary search tree covers a certain range
978 * of bits, and keys above and below the set it covers might
979 * differ outside those bits - so we have to special case the
980 * start and end - handle that here:
981 */
982
983 if (unlikely(bkey_cmp(search, &t->end) >= 0))
Kent Overstreetfafff812013-12-17 21:56:21 -0800984 return bset_bkey_last(t->data);
Kent Overstreetcafe5632013-03-23 16:11:31 -0700985
986 if (unlikely(bkey_cmp(search, t->data->start) < 0))
987 return t->data->start;
988
Kent Overstreeta85e9682013-12-20 17:28:16 -0800989 i = bset_search_tree(t, search);
990 } else {
Kent Overstreetc052dd92013-11-11 17:35:24 -0800991 BUG_ON(!b->nsets &&
Kent Overstreeta85e9682013-12-20 17:28:16 -0800992 t->size < bkey_to_cacheline(t, bset_bkey_last(t->data)));
993
994 i = bset_search_write_set(t, search);
995 }
Kent Overstreetcafe5632013-03-23 16:11:31 -0700996
Kent Overstreetc052dd92013-11-11 17:35:24 -0800997 if (btree_keys_expensive_checks(b)) {
998 BUG_ON(bset_written(b, t) &&
Kent Overstreet280481d2013-10-24 16:36:03 -0700999 i.l != t->data->start &&
1000 bkey_cmp(tree_to_prev_bkey(t,
1001 inorder_to_tree(bkey_to_cacheline(t, i.l), t)),
1002 search) > 0);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001003
Kent Overstreetfafff812013-12-17 21:56:21 -08001004 BUG_ON(i.r != bset_bkey_last(t->data) &&
Kent Overstreet280481d2013-10-24 16:36:03 -07001005 bkey_cmp(i.r, search) <= 0);
1006 }
Kent Overstreetcafe5632013-03-23 16:11:31 -07001007
1008 while (likely(i.l != i.r) &&
1009 bkey_cmp(i.l, search) <= 0)
1010 i.l = bkey_next(i.l);
1011
1012 return i.l;
1013}
Kent Overstreeta85e9682013-12-20 17:28:16 -08001014EXPORT_SYMBOL(__bch_bset_search);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001015
1016/* Btree iterator */
1017
Kent Overstreet911c9612013-07-28 18:35:09 -07001018typedef bool (btree_iter_cmp_fn)(struct btree_iter_set,
1019 struct btree_iter_set);
1020
Kent Overstreetcafe5632013-03-23 16:11:31 -07001021static inline bool btree_iter_cmp(struct btree_iter_set l,
1022 struct btree_iter_set r)
1023{
Kent Overstreet911c9612013-07-28 18:35:09 -07001024 return bkey_cmp(l.k, r.k) > 0;
Kent Overstreetcafe5632013-03-23 16:11:31 -07001025}
1026
1027static inline bool btree_iter_end(struct btree_iter *iter)
1028{
1029 return !iter->used;
1030}
1031
1032void bch_btree_iter_push(struct btree_iter *iter, struct bkey *k,
1033 struct bkey *end)
1034{
1035 if (k != end)
1036 BUG_ON(!heap_add(iter,
1037 ((struct btree_iter_set) { k, end }),
1038 btree_iter_cmp));
1039}
1040
Kent Overstreetc052dd92013-11-11 17:35:24 -08001041static struct bkey *__bch_btree_iter_init(struct btree_keys *b,
Kent Overstreet911c9612013-07-28 18:35:09 -07001042 struct btree_iter *iter,
1043 struct bkey *search,
1044 struct bset_tree *start)
Kent Overstreetcafe5632013-03-23 16:11:31 -07001045{
1046 struct bkey *ret = NULL;
1047 iter->size = ARRAY_SIZE(iter->data);
1048 iter->used = 0;
1049
Kent Overstreet280481d2013-10-24 16:36:03 -07001050#ifdef CONFIG_BCACHE_DEBUG
1051 iter->b = b;
1052#endif
1053
Kent Overstreetc052dd92013-11-11 17:35:24 -08001054 for (; start <= bset_tree_last(b); start++) {
Kent Overstreetcafe5632013-03-23 16:11:31 -07001055 ret = bch_bset_search(b, start, search);
Kent Overstreetfafff812013-12-17 21:56:21 -08001056 bch_btree_iter_push(iter, ret, bset_bkey_last(start->data));
Kent Overstreetcafe5632013-03-23 16:11:31 -07001057 }
1058
1059 return ret;
1060}
1061
Kent Overstreetc052dd92013-11-11 17:35:24 -08001062struct bkey *bch_btree_iter_init(struct btree_keys *b,
Kent Overstreet911c9612013-07-28 18:35:09 -07001063 struct btree_iter *iter,
1064 struct bkey *search)
1065{
Kent Overstreetc052dd92013-11-11 17:35:24 -08001066 return __bch_btree_iter_init(b, iter, search, b->set);
Kent Overstreet911c9612013-07-28 18:35:09 -07001067}
Kent Overstreeta85e9682013-12-20 17:28:16 -08001068EXPORT_SYMBOL(bch_btree_iter_init);
Kent Overstreet911c9612013-07-28 18:35:09 -07001069
1070static inline struct bkey *__bch_btree_iter_next(struct btree_iter *iter,
1071 btree_iter_cmp_fn *cmp)
Kent Overstreetcafe5632013-03-23 16:11:31 -07001072{
1073 struct btree_iter_set unused;
1074 struct bkey *ret = NULL;
1075
1076 if (!btree_iter_end(iter)) {
Kent Overstreet280481d2013-10-24 16:36:03 -07001077 bch_btree_iter_next_check(iter);
1078
Kent Overstreetcafe5632013-03-23 16:11:31 -07001079 ret = iter->data->k;
1080 iter->data->k = bkey_next(iter->data->k);
1081
1082 if (iter->data->k > iter->data->end) {
Kent Overstreetcc0f4ea2013-03-27 12:47:45 -07001083 WARN_ONCE(1, "bset was corrupt!\n");
Kent Overstreetcafe5632013-03-23 16:11:31 -07001084 iter->data->k = iter->data->end;
1085 }
1086
1087 if (iter->data->k == iter->data->end)
Kent Overstreet911c9612013-07-28 18:35:09 -07001088 heap_pop(iter, unused, cmp);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001089 else
Kent Overstreet911c9612013-07-28 18:35:09 -07001090 heap_sift(iter, 0, cmp);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001091 }
1092
1093 return ret;
1094}
1095
Kent Overstreet911c9612013-07-28 18:35:09 -07001096struct bkey *bch_btree_iter_next(struct btree_iter *iter)
1097{
1098 return __bch_btree_iter_next(iter, btree_iter_cmp);
1099
1100}
Kent Overstreeta85e9682013-12-20 17:28:16 -08001101EXPORT_SYMBOL(bch_btree_iter_next);
Kent Overstreet911c9612013-07-28 18:35:09 -07001102
Kent Overstreetcafe5632013-03-23 16:11:31 -07001103struct bkey *bch_btree_iter_next_filter(struct btree_iter *iter,
Kent Overstreeta85e9682013-12-20 17:28:16 -08001104 struct btree_keys *b, ptr_filter_fn fn)
Kent Overstreetcafe5632013-03-23 16:11:31 -07001105{
1106 struct bkey *ret;
1107
1108 do {
1109 ret = bch_btree_iter_next(iter);
1110 } while (ret && fn(b, ret));
1111
1112 return ret;
1113}
1114
Kent Overstreetcafe5632013-03-23 16:11:31 -07001115/* Mergesort */
1116
Kent Overstreet67539e82013-09-10 22:53:34 -07001117void bch_bset_sort_state_free(struct bset_sort_state *state)
1118{
1119 if (state->pool)
1120 mempool_destroy(state->pool);
1121}
1122
1123int bch_bset_sort_state_init(struct bset_sort_state *state, unsigned page_order)
1124{
1125 spin_lock_init(&state->time.lock);
1126
1127 state->page_order = page_order;
1128 state->crit_factor = int_sqrt(1 << page_order);
1129
1130 state->pool = mempool_create_page_pool(1, page_order);
1131 if (!state->pool)
1132 return -ENOMEM;
1133
1134 return 0;
1135}
Kent Overstreeta85e9682013-12-20 17:28:16 -08001136EXPORT_SYMBOL(bch_bset_sort_state_init);
Kent Overstreet67539e82013-09-10 22:53:34 -07001137
Kent Overstreeta85e9682013-12-20 17:28:16 -08001138static void btree_mergesort(struct btree_keys *b, struct bset *out,
Kent Overstreetcafe5632013-03-23 16:11:31 -07001139 struct btree_iter *iter,
1140 bool fixup, bool remove_stale)
1141{
Kent Overstreet911c9612013-07-28 18:35:09 -07001142 int i;
Kent Overstreetcafe5632013-03-23 16:11:31 -07001143 struct bkey *k, *last = NULL;
Kent Overstreetef71ec02013-12-17 17:51:02 -08001144 BKEY_PADDED(k) tmp;
Kent Overstreeta85e9682013-12-20 17:28:16 -08001145 bool (*bad)(struct btree_keys *, const struct bkey *) = remove_stale
Kent Overstreetcafe5632013-03-23 16:11:31 -07001146 ? bch_ptr_bad
1147 : bch_ptr_invalid;
1148
Kent Overstreet911c9612013-07-28 18:35:09 -07001149 /* Heapify the iterator, using our comparison function */
1150 for (i = iter->used / 2 - 1; i >= 0; --i)
Kent Overstreet65d45232013-12-20 17:22:05 -08001151 heap_sift(iter, i, b->ops->sort_cmp);
Kent Overstreet911c9612013-07-28 18:35:09 -07001152
Kent Overstreetcafe5632013-03-23 16:11:31 -07001153 while (!btree_iter_end(iter)) {
Kent Overstreet65d45232013-12-20 17:22:05 -08001154 if (b->ops->sort_fixup && fixup)
1155 k = b->ops->sort_fixup(iter, &tmp.k);
Kent Overstreetef71ec02013-12-17 17:51:02 -08001156 else
1157 k = NULL;
Kent Overstreetcafe5632013-03-23 16:11:31 -07001158
Kent Overstreetef71ec02013-12-17 17:51:02 -08001159 if (!k)
Kent Overstreet65d45232013-12-20 17:22:05 -08001160 k = __bch_btree_iter_next(iter, b->ops->sort_cmp);
Kent Overstreetef71ec02013-12-17 17:51:02 -08001161
Kent Overstreetcafe5632013-03-23 16:11:31 -07001162 if (bad(b, k))
1163 continue;
1164
1165 if (!last) {
1166 last = out->start;
1167 bkey_copy(last, k);
Kent Overstreet65d45232013-12-20 17:22:05 -08001168 } else if (!bch_bkey_try_merge(b, last, k)) {
Kent Overstreetcafe5632013-03-23 16:11:31 -07001169 last = bkey_next(last);
1170 bkey_copy(last, k);
1171 }
1172 }
1173
1174 out->keys = last ? (uint64_t *) bkey_next(last) - out->d : 0;
1175
1176 pr_debug("sorted %i keys", out->keys);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001177}
1178
Kent Overstreeta85e9682013-12-20 17:28:16 -08001179static void __btree_sort(struct btree_keys *b, struct btree_iter *iter,
Kent Overstreet67539e82013-09-10 22:53:34 -07001180 unsigned start, unsigned order, bool fixup,
1181 struct bset_sort_state *state)
Kent Overstreetcafe5632013-03-23 16:11:31 -07001182{
1183 uint64_t start_time;
Kent Overstreet0a451142013-12-18 00:01:06 -08001184 bool used_mempool = false;
Kent Overstreet501d52a2014-05-19 08:55:40 -07001185 struct bset *out = (void *) __get_free_pages(__GFP_NOWARN|GFP_NOWAIT,
Kent Overstreetcafe5632013-03-23 16:11:31 -07001186 order);
1187 if (!out) {
Kent Overstreet35723242014-01-10 18:53:02 -08001188 struct page *outp;
1189
Kent Overstreet67539e82013-09-10 22:53:34 -07001190 BUG_ON(order > state->page_order);
1191
Kent Overstreet35723242014-01-10 18:53:02 -08001192 outp = mempool_alloc(state->pool, GFP_NOIO);
1193 out = page_address(outp);
Kent Overstreet0a451142013-12-18 00:01:06 -08001194 used_mempool = true;
Kent Overstreeta85e9682013-12-20 17:28:16 -08001195 order = state->page_order;
Kent Overstreetcafe5632013-03-23 16:11:31 -07001196 }
1197
1198 start_time = local_clock();
1199
Kent Overstreet67539e82013-09-10 22:53:34 -07001200 btree_mergesort(b, out, iter, fixup, false);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001201 b->nsets = start;
1202
Kent Overstreetcafe5632013-03-23 16:11:31 -07001203 if (!start && order == b->page_order) {
1204 /*
1205 * Our temporary buffer is the same size as the btree node's
1206 * buffer, we can just swap buffers instead of doing a big
1207 * memcpy()
1208 */
1209
Kent Overstreeta85e9682013-12-20 17:28:16 -08001210 out->magic = b->set->data->magic;
1211 out->seq = b->set->data->seq;
1212 out->version = b->set->data->version;
1213 swap(out, b->set->data);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001214 } else {
Kent Overstreeta85e9682013-12-20 17:28:16 -08001215 b->set[start].data->keys = out->keys;
1216 memcpy(b->set[start].data->start, out->start,
Kent Overstreetfafff812013-12-17 21:56:21 -08001217 (void *) bset_bkey_last(out) - (void *) out->start);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001218 }
1219
Kent Overstreet0a451142013-12-18 00:01:06 -08001220 if (used_mempool)
Kent Overstreet67539e82013-09-10 22:53:34 -07001221 mempool_free(virt_to_page(out), state->pool);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001222 else
1223 free_pages((unsigned long) out, order);
1224
Kent Overstreeta85e9682013-12-20 17:28:16 -08001225 bch_bset_build_written_tree(b);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001226
Kent Overstreet65d22e92013-07-31 00:03:54 -07001227 if (!start)
Kent Overstreet67539e82013-09-10 22:53:34 -07001228 bch_time_stats_update(&state->time, start_time);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001229}
1230
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001231void bch_btree_sort_partial(struct btree_keys *b, unsigned start,
Kent Overstreet67539e82013-09-10 22:53:34 -07001232 struct bset_sort_state *state)
Kent Overstreetcafe5632013-03-23 16:11:31 -07001233{
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001234 size_t order = b->page_order, keys = 0;
Kent Overstreetcafe5632013-03-23 16:11:31 -07001235 struct btree_iter iter;
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001236 int oldsize = bch_count_data(b);
Kent Overstreet280481d2013-10-24 16:36:03 -07001237
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001238 __bch_btree_iter_init(b, &iter, NULL, &b->set[start]);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001239
1240 if (start) {
1241 unsigned i;
1242
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001243 for (i = start; i <= b->nsets; i++)
1244 keys += b->set[i].data->keys;
Kent Overstreetcafe5632013-03-23 16:11:31 -07001245
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001246 order = get_order(__set_bytes(b->set->data, keys));
Kent Overstreetcafe5632013-03-23 16:11:31 -07001247 }
1248
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001249 __btree_sort(b, &iter, start, order, false, state);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001250
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001251 EBUG_ON(oldsize >= 0 && bch_count_data(b) != oldsize);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001252}
Kent Overstreet65d45232013-12-20 17:22:05 -08001253EXPORT_SYMBOL(bch_btree_sort_partial);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001254
Kent Overstreeta85e9682013-12-20 17:28:16 -08001255void bch_btree_sort_and_fix_extents(struct btree_keys *b,
1256 struct btree_iter *iter,
Kent Overstreet67539e82013-09-10 22:53:34 -07001257 struct bset_sort_state *state)
Kent Overstreetcafe5632013-03-23 16:11:31 -07001258{
Kent Overstreet67539e82013-09-10 22:53:34 -07001259 __btree_sort(b, iter, 0, b->page_order, true, state);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001260}
1261
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001262void bch_btree_sort_into(struct btree_keys *b, struct btree_keys *new,
Kent Overstreet67539e82013-09-10 22:53:34 -07001263 struct bset_sort_state *state)
Kent Overstreetcafe5632013-03-23 16:11:31 -07001264{
1265 uint64_t start_time = local_clock();
1266
1267 struct btree_iter iter;
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001268 bch_btree_iter_init(b, &iter, NULL);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001269
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001270 btree_mergesort(b, new->set->data, &iter, false, true);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001271
Kent Overstreet67539e82013-09-10 22:53:34 -07001272 bch_time_stats_update(&state->time, start_time);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001273
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001274 new->set->size = 0; // XXX: why?
Kent Overstreetcafe5632013-03-23 16:11:31 -07001275}
1276
Kent Overstreet6ded34d2013-05-11 15:59:37 -07001277#define SORT_CRIT (4096 / sizeof(uint64_t))
1278
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001279void bch_btree_sort_lazy(struct btree_keys *b, struct bset_sort_state *state)
Kent Overstreetcafe5632013-03-23 16:11:31 -07001280{
Kent Overstreet6ded34d2013-05-11 15:59:37 -07001281 unsigned crit = SORT_CRIT;
1282 int i;
Kent Overstreetcafe5632013-03-23 16:11:31 -07001283
Kent Overstreet6ded34d2013-05-11 15:59:37 -07001284 /* Don't sort if nothing to do */
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001285 if (!b->nsets)
Kent Overstreet6ded34d2013-05-11 15:59:37 -07001286 goto out;
Kent Overstreetcafe5632013-03-23 16:11:31 -07001287
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001288 for (i = b->nsets - 1; i >= 0; --i) {
Kent Overstreet67539e82013-09-10 22:53:34 -07001289 crit *= state->crit_factor;
Kent Overstreetcafe5632013-03-23 16:11:31 -07001290
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001291 if (b->set[i].data->keys < crit) {
Kent Overstreet67539e82013-09-10 22:53:34 -07001292 bch_btree_sort_partial(b, i, state);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001293 return;
1294 }
1295 }
1296
Kent Overstreet6ded34d2013-05-11 15:59:37 -07001297 /* Sort if we'd overflow */
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001298 if (b->nsets + 1 == MAX_BSETS) {
Kent Overstreet67539e82013-09-10 22:53:34 -07001299 bch_btree_sort(b, state);
Kent Overstreet6ded34d2013-05-11 15:59:37 -07001300 return;
1301 }
1302
1303out:
Kent Overstreet89ebb4a2013-11-11 18:38:51 -08001304 bch_bset_build_written_tree(b);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001305}
Kent Overstreeta85e9682013-12-20 17:28:16 -08001306EXPORT_SYMBOL(bch_btree_sort_lazy);
Kent Overstreetcafe5632013-03-23 16:11:31 -07001307
Kent Overstreetf67342d2013-11-11 19:25:55 -08001308void bch_btree_keys_stats(struct btree_keys *b, struct bset_stats *stats)
Kent Overstreetcafe5632013-03-23 16:11:31 -07001309{
Kent Overstreetcafe5632013-03-23 16:11:31 -07001310 unsigned i;
1311
Kent Overstreetf67342d2013-11-11 19:25:55 -08001312 for (i = 0; i <= b->nsets; i++) {
1313 struct bset_tree *t = &b->set[i];
Kent Overstreetcafe5632013-03-23 16:11:31 -07001314 size_t bytes = t->data->keys * sizeof(uint64_t);
1315 size_t j;
1316
Kent Overstreetf67342d2013-11-11 19:25:55 -08001317 if (bset_written(b, t)) {
Kent Overstreetcafe5632013-03-23 16:11:31 -07001318 stats->sets_written++;
1319 stats->bytes_written += bytes;
1320
1321 stats->floats += t->size - 1;
1322
1323 for (j = 1; j < t->size; j++)
1324 if (t->tree[j].exponent == 127)
1325 stats->failed++;
1326 } else {
1327 stats->sets_unwritten++;
1328 stats->bytes_unwritten += bytes;
1329 }
1330 }
Kent Overstreetcafe5632013-03-23 16:11:31 -07001331}