Kent Overstreet | cafe563 | 2013-03-23 16:11:31 -0700 | [diff] [blame] | 1 | /* |
| 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 | |
| 8 | #include "bcache.h" |
| 9 | #include "btree.h" |
| 10 | #include "debug.h" |
| 11 | |
| 12 | #include <linux/random.h> |
Geert Uytterhoeven | cd953ed | 2013-03-27 18:56:28 +0100 | [diff] [blame] | 13 | #include <linux/prefetch.h> |
Kent Overstreet | cafe563 | 2013-03-23 16:11:31 -0700 | [diff] [blame] | 14 | |
| 15 | /* Keylists */ |
| 16 | |
| 17 | void bch_keylist_copy(struct keylist *dest, struct keylist *src) |
| 18 | { |
| 19 | *dest = *src; |
| 20 | |
| 21 | if (src->list == src->d) { |
| 22 | size_t n = (uint64_t *) src->top - src->d; |
| 23 | dest->top = (struct bkey *) &dest->d[n]; |
| 24 | dest->list = dest->d; |
| 25 | } |
| 26 | } |
| 27 | |
| 28 | int bch_keylist_realloc(struct keylist *l, int nptrs, struct cache_set *c) |
| 29 | { |
| 30 | unsigned oldsize = (uint64_t *) l->top - l->list; |
| 31 | unsigned newsize = oldsize + 2 + nptrs; |
| 32 | uint64_t *new; |
| 33 | |
| 34 | /* The journalling code doesn't handle the case where the keys to insert |
| 35 | * is bigger than an empty write: If we just return -ENOMEM here, |
| 36 | * bio_insert() and bio_invalidate() will insert the keys created so far |
| 37 | * and finish the rest when the keylist is empty. |
| 38 | */ |
| 39 | if (newsize * sizeof(uint64_t) > block_bytes(c) - sizeof(struct jset)) |
| 40 | return -ENOMEM; |
| 41 | |
| 42 | newsize = roundup_pow_of_two(newsize); |
| 43 | |
| 44 | if (newsize <= KEYLIST_INLINE || |
| 45 | roundup_pow_of_two(oldsize) == newsize) |
| 46 | return 0; |
| 47 | |
| 48 | new = krealloc(l->list == l->d ? NULL : l->list, |
| 49 | sizeof(uint64_t) * newsize, GFP_NOIO); |
| 50 | |
| 51 | if (!new) |
| 52 | return -ENOMEM; |
| 53 | |
| 54 | if (l->list == l->d) |
| 55 | memcpy(new, l->list, sizeof(uint64_t) * KEYLIST_INLINE); |
| 56 | |
| 57 | l->list = new; |
| 58 | l->top = (struct bkey *) (&l->list[oldsize]); |
| 59 | |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | struct bkey *bch_keylist_pop(struct keylist *l) |
| 64 | { |
| 65 | struct bkey *k = l->bottom; |
| 66 | |
| 67 | if (k == l->top) |
| 68 | return NULL; |
| 69 | |
| 70 | while (bkey_next(k) != l->top) |
| 71 | k = bkey_next(k); |
| 72 | |
| 73 | return l->top = k; |
| 74 | } |
| 75 | |
| 76 | /* Pointer validation */ |
| 77 | |
| 78 | bool __bch_ptr_invalid(struct cache_set *c, int level, const struct bkey *k) |
| 79 | { |
| 80 | unsigned i; |
| 81 | |
| 82 | if (level && (!KEY_PTRS(k) || !KEY_SIZE(k) || KEY_DIRTY(k))) |
| 83 | goto bad; |
| 84 | |
| 85 | if (!level && KEY_SIZE(k) > KEY_OFFSET(k)) |
| 86 | goto bad; |
| 87 | |
| 88 | if (!KEY_SIZE(k)) |
| 89 | return true; |
| 90 | |
| 91 | for (i = 0; i < KEY_PTRS(k); i++) |
| 92 | if (ptr_available(c, k, i)) { |
| 93 | struct cache *ca = PTR_CACHE(c, k, i); |
| 94 | size_t bucket = PTR_BUCKET_NR(c, k, i); |
| 95 | size_t r = bucket_remainder(c, PTR_OFFSET(k, i)); |
| 96 | |
| 97 | if (KEY_SIZE(k) + r > c->sb.bucket_size || |
| 98 | bucket < ca->sb.first_bucket || |
| 99 | bucket >= ca->sb.nbuckets) |
| 100 | goto bad; |
| 101 | } |
| 102 | |
| 103 | return false; |
| 104 | bad: |
| 105 | cache_bug(c, "spotted bad key %s: %s", pkey(k), bch_ptr_status(c, k)); |
| 106 | return true; |
| 107 | } |
| 108 | |
| 109 | bool bch_ptr_bad(struct btree *b, const struct bkey *k) |
| 110 | { |
| 111 | struct bucket *g; |
| 112 | unsigned i, stale; |
| 113 | |
| 114 | if (!bkey_cmp(k, &ZERO_KEY) || |
| 115 | !KEY_PTRS(k) || |
| 116 | bch_ptr_invalid(b, k)) |
| 117 | return true; |
| 118 | |
| 119 | if (KEY_PTRS(k) && PTR_DEV(k, 0) == PTR_CHECK_DEV) |
| 120 | return true; |
| 121 | |
| 122 | for (i = 0; i < KEY_PTRS(k); i++) |
| 123 | if (ptr_available(b->c, k, i)) { |
| 124 | g = PTR_BUCKET(b->c, k, i); |
| 125 | stale = ptr_stale(b->c, k, i); |
| 126 | |
| 127 | btree_bug_on(stale > 96, b, |
| 128 | "key too stale: %i, need_gc %u", |
| 129 | stale, b->c->need_gc); |
| 130 | |
| 131 | btree_bug_on(stale && KEY_DIRTY(k) && KEY_SIZE(k), |
| 132 | b, "stale dirty pointer"); |
| 133 | |
| 134 | if (stale) |
| 135 | return true; |
| 136 | |
| 137 | #ifdef CONFIG_BCACHE_EDEBUG |
| 138 | if (!mutex_trylock(&b->c->bucket_lock)) |
| 139 | continue; |
| 140 | |
| 141 | if (b->level) { |
| 142 | if (KEY_DIRTY(k) || |
| 143 | g->prio != BTREE_PRIO || |
| 144 | (b->c->gc_mark_valid && |
| 145 | GC_MARK(g) != GC_MARK_METADATA)) |
| 146 | goto bug; |
| 147 | |
| 148 | } else { |
| 149 | if (g->prio == BTREE_PRIO) |
| 150 | goto bug; |
| 151 | |
| 152 | if (KEY_DIRTY(k) && |
| 153 | b->c->gc_mark_valid && |
| 154 | GC_MARK(g) != GC_MARK_DIRTY) |
| 155 | goto bug; |
| 156 | } |
| 157 | mutex_unlock(&b->c->bucket_lock); |
| 158 | #endif |
| 159 | } |
| 160 | |
| 161 | return false; |
| 162 | #ifdef CONFIG_BCACHE_EDEBUG |
| 163 | bug: |
| 164 | mutex_unlock(&b->c->bucket_lock); |
Kent Overstreet | b1a67b0 | 2013-03-25 11:46:44 -0700 | [diff] [blame] | 165 | btree_bug(b, |
| 166 | "inconsistent pointer %s: bucket %zu pin %i prio %i gen %i last_gc %i mark %llu gc_gen %i", |
| 167 | pkey(k), PTR_BUCKET_NR(b->c, k, i), atomic_read(&g->pin), |
Kent Overstreet | cafe563 | 2013-03-23 16:11:31 -0700 | [diff] [blame] | 168 | g->prio, g->gen, g->last_gc, GC_MARK(g), g->gc_gen); |
| 169 | return true; |
| 170 | #endif |
| 171 | } |
| 172 | |
| 173 | /* Key/pointer manipulation */ |
| 174 | |
| 175 | void bch_bkey_copy_single_ptr(struct bkey *dest, const struct bkey *src, |
| 176 | unsigned i) |
| 177 | { |
| 178 | BUG_ON(i > KEY_PTRS(src)); |
| 179 | |
| 180 | /* Only copy the header, key, and one pointer. */ |
| 181 | memcpy(dest, src, 2 * sizeof(uint64_t)); |
| 182 | dest->ptr[0] = src->ptr[i]; |
| 183 | SET_KEY_PTRS(dest, 1); |
| 184 | /* We didn't copy the checksum so clear that bit. */ |
| 185 | SET_KEY_CSUM(dest, 0); |
| 186 | } |
| 187 | |
| 188 | bool __bch_cut_front(const struct bkey *where, struct bkey *k) |
| 189 | { |
| 190 | unsigned i, len = 0; |
| 191 | |
| 192 | if (bkey_cmp(where, &START_KEY(k)) <= 0) |
| 193 | return false; |
| 194 | |
| 195 | if (bkey_cmp(where, k) < 0) |
| 196 | len = KEY_OFFSET(k) - KEY_OFFSET(where); |
| 197 | else |
| 198 | bkey_copy_key(k, where); |
| 199 | |
| 200 | for (i = 0; i < KEY_PTRS(k); i++) |
| 201 | SET_PTR_OFFSET(k, i, PTR_OFFSET(k, i) + KEY_SIZE(k) - len); |
| 202 | |
| 203 | BUG_ON(len > KEY_SIZE(k)); |
| 204 | SET_KEY_SIZE(k, len); |
| 205 | return true; |
| 206 | } |
| 207 | |
| 208 | bool __bch_cut_back(const struct bkey *where, struct bkey *k) |
| 209 | { |
| 210 | unsigned len = 0; |
| 211 | |
| 212 | if (bkey_cmp(where, k) >= 0) |
| 213 | return false; |
| 214 | |
| 215 | BUG_ON(KEY_INODE(where) != KEY_INODE(k)); |
| 216 | |
| 217 | if (bkey_cmp(where, &START_KEY(k)) > 0) |
| 218 | len = KEY_OFFSET(where) - KEY_START(k); |
| 219 | |
| 220 | bkey_copy_key(k, where); |
| 221 | |
| 222 | BUG_ON(len > KEY_SIZE(k)); |
| 223 | SET_KEY_SIZE(k, len); |
| 224 | return true; |
| 225 | } |
| 226 | |
| 227 | static uint64_t merge_chksums(struct bkey *l, struct bkey *r) |
| 228 | { |
| 229 | return (l->ptr[KEY_PTRS(l)] + r->ptr[KEY_PTRS(r)]) & |
| 230 | ~((uint64_t)1 << 63); |
| 231 | } |
| 232 | |
| 233 | /* Tries to merge l and r: l should be lower than r |
| 234 | * Returns true if we were able to merge. If we did merge, l will be the merged |
| 235 | * key, r will be untouched. |
| 236 | */ |
| 237 | bool bch_bkey_try_merge(struct btree *b, struct bkey *l, struct bkey *r) |
| 238 | { |
| 239 | unsigned i; |
| 240 | |
| 241 | if (key_merging_disabled(b->c)) |
| 242 | return false; |
| 243 | |
| 244 | if (KEY_PTRS(l) != KEY_PTRS(r) || |
| 245 | KEY_DIRTY(l) != KEY_DIRTY(r) || |
| 246 | bkey_cmp(l, &START_KEY(r))) |
| 247 | return false; |
| 248 | |
| 249 | for (i = 0; i < KEY_PTRS(l); i++) |
| 250 | if (l->ptr[i] + PTR(0, KEY_SIZE(l), 0) != r->ptr[i] || |
| 251 | PTR_BUCKET_NR(b->c, l, i) != PTR_BUCKET_NR(b->c, r, i)) |
| 252 | return false; |
| 253 | |
| 254 | /* Keys with no pointers aren't restricted to one bucket and could |
| 255 | * overflow KEY_SIZE |
| 256 | */ |
| 257 | if (KEY_SIZE(l) + KEY_SIZE(r) > USHRT_MAX) { |
| 258 | SET_KEY_OFFSET(l, KEY_OFFSET(l) + USHRT_MAX - KEY_SIZE(l)); |
| 259 | SET_KEY_SIZE(l, USHRT_MAX); |
| 260 | |
| 261 | bch_cut_front(l, r); |
| 262 | return false; |
| 263 | } |
| 264 | |
| 265 | if (KEY_CSUM(l)) { |
| 266 | if (KEY_CSUM(r)) |
| 267 | l->ptr[KEY_PTRS(l)] = merge_chksums(l, r); |
| 268 | else |
| 269 | SET_KEY_CSUM(l, 0); |
| 270 | } |
| 271 | |
| 272 | SET_KEY_OFFSET(l, KEY_OFFSET(l) + KEY_SIZE(r)); |
| 273 | SET_KEY_SIZE(l, KEY_SIZE(l) + KEY_SIZE(r)); |
| 274 | |
| 275 | return true; |
| 276 | } |
| 277 | |
| 278 | /* Binary tree stuff for auxiliary search trees */ |
| 279 | |
| 280 | static unsigned inorder_next(unsigned j, unsigned size) |
| 281 | { |
| 282 | if (j * 2 + 1 < size) { |
| 283 | j = j * 2 + 1; |
| 284 | |
| 285 | while (j * 2 < size) |
| 286 | j *= 2; |
| 287 | } else |
| 288 | j >>= ffz(j) + 1; |
| 289 | |
| 290 | return j; |
| 291 | } |
| 292 | |
| 293 | static unsigned inorder_prev(unsigned j, unsigned size) |
| 294 | { |
| 295 | if (j * 2 < size) { |
| 296 | j = j * 2; |
| 297 | |
| 298 | while (j * 2 + 1 < size) |
| 299 | j = j * 2 + 1; |
| 300 | } else |
| 301 | j >>= ffs(j); |
| 302 | |
| 303 | return j; |
| 304 | } |
| 305 | |
| 306 | /* I have no idea why this code works... and I'm the one who wrote it |
| 307 | * |
| 308 | * However, I do know what it does: |
| 309 | * Given a binary tree constructed in an array (i.e. how you normally implement |
| 310 | * a heap), it converts a node in the tree - referenced by array index - to the |
| 311 | * index it would have if you did an inorder traversal. |
| 312 | * |
| 313 | * Also tested for every j, size up to size somewhere around 6 million. |
| 314 | * |
| 315 | * The binary tree starts at array index 1, not 0 |
| 316 | * extra is a function of size: |
| 317 | * extra = (size - rounddown_pow_of_two(size - 1)) << 1; |
| 318 | */ |
| 319 | static unsigned __to_inorder(unsigned j, unsigned size, unsigned extra) |
| 320 | { |
| 321 | unsigned b = fls(j); |
| 322 | unsigned shift = fls(size - 1) - b; |
| 323 | |
| 324 | j ^= 1U << (b - 1); |
| 325 | j <<= 1; |
| 326 | j |= 1; |
| 327 | j <<= shift; |
| 328 | |
| 329 | if (j > extra) |
| 330 | j -= (j - extra) >> 1; |
| 331 | |
| 332 | return j; |
| 333 | } |
| 334 | |
| 335 | static unsigned to_inorder(unsigned j, struct bset_tree *t) |
| 336 | { |
| 337 | return __to_inorder(j, t->size, t->extra); |
| 338 | } |
| 339 | |
| 340 | static unsigned __inorder_to_tree(unsigned j, unsigned size, unsigned extra) |
| 341 | { |
| 342 | unsigned shift; |
| 343 | |
| 344 | if (j > extra) |
| 345 | j += j - extra; |
| 346 | |
| 347 | shift = ffs(j); |
| 348 | |
| 349 | j >>= shift; |
| 350 | j |= roundup_pow_of_two(size) >> shift; |
| 351 | |
| 352 | return j; |
| 353 | } |
| 354 | |
| 355 | static unsigned inorder_to_tree(unsigned j, struct bset_tree *t) |
| 356 | { |
| 357 | return __inorder_to_tree(j, t->size, t->extra); |
| 358 | } |
| 359 | |
| 360 | #if 0 |
| 361 | void inorder_test(void) |
| 362 | { |
| 363 | unsigned long done = 0; |
| 364 | ktime_t start = ktime_get(); |
| 365 | |
| 366 | for (unsigned size = 2; |
| 367 | size < 65536000; |
| 368 | size++) { |
| 369 | unsigned extra = (size - rounddown_pow_of_two(size - 1)) << 1; |
| 370 | unsigned i = 1, j = rounddown_pow_of_two(size - 1); |
| 371 | |
| 372 | if (!(size % 4096)) |
| 373 | printk(KERN_NOTICE "loop %u, %llu per us\n", size, |
| 374 | done / ktime_us_delta(ktime_get(), start)); |
| 375 | |
| 376 | while (1) { |
| 377 | if (__inorder_to_tree(i, size, extra) != j) |
| 378 | panic("size %10u j %10u i %10u", size, j, i); |
| 379 | |
| 380 | if (__to_inorder(j, size, extra) != i) |
| 381 | panic("size %10u j %10u i %10u", size, j, i); |
| 382 | |
| 383 | if (j == rounddown_pow_of_two(size) - 1) |
| 384 | break; |
| 385 | |
| 386 | BUG_ON(inorder_prev(inorder_next(j, size), size) != j); |
| 387 | |
| 388 | j = inorder_next(j, size); |
| 389 | i++; |
| 390 | } |
| 391 | |
| 392 | done += size - 1; |
| 393 | } |
| 394 | } |
| 395 | #endif |
| 396 | |
| 397 | /* |
Phil Viana | 48a7302 | 2013-06-03 09:51:42 -0300 | [diff] [blame^] | 398 | * Cacheline/offset <-> bkey pointer arithmetic: |
Kent Overstreet | cafe563 | 2013-03-23 16:11:31 -0700 | [diff] [blame] | 399 | * |
| 400 | * t->tree is a binary search tree in an array; each node corresponds to a key |
| 401 | * in one cacheline in t->set (BSET_CACHELINE bytes). |
| 402 | * |
| 403 | * This means we don't have to store the full index of the key that a node in |
| 404 | * the binary tree points to; to_inorder() gives us the cacheline, and then |
| 405 | * bkey_float->m gives us the offset within that cacheline, in units of 8 bytes. |
| 406 | * |
Phil Viana | 48a7302 | 2013-06-03 09:51:42 -0300 | [diff] [blame^] | 407 | * cacheline_to_bkey() and friends abstract out all the pointer arithmetic to |
Kent Overstreet | cafe563 | 2013-03-23 16:11:31 -0700 | [diff] [blame] | 408 | * make this work. |
| 409 | * |
| 410 | * To construct the bfloat for an arbitrary key we need to know what the key |
| 411 | * immediately preceding it is: we have to check if the two keys differ in the |
| 412 | * bits we're going to store in bkey_float->mantissa. t->prev[j] stores the size |
| 413 | * of the previous key so we can walk backwards to it from t->tree[j]'s key. |
| 414 | */ |
| 415 | |
| 416 | static struct bkey *cacheline_to_bkey(struct bset_tree *t, unsigned cacheline, |
| 417 | unsigned offset) |
| 418 | { |
| 419 | return ((void *) t->data) + cacheline * BSET_CACHELINE + offset * 8; |
| 420 | } |
| 421 | |
| 422 | static unsigned bkey_to_cacheline(struct bset_tree *t, struct bkey *k) |
| 423 | { |
| 424 | return ((void *) k - (void *) t->data) / BSET_CACHELINE; |
| 425 | } |
| 426 | |
| 427 | static unsigned bkey_to_cacheline_offset(struct bkey *k) |
| 428 | { |
| 429 | return ((size_t) k & (BSET_CACHELINE - 1)) / sizeof(uint64_t); |
| 430 | } |
| 431 | |
| 432 | static struct bkey *tree_to_bkey(struct bset_tree *t, unsigned j) |
| 433 | { |
| 434 | return cacheline_to_bkey(t, to_inorder(j, t), t->tree[j].m); |
| 435 | } |
| 436 | |
| 437 | static struct bkey *tree_to_prev_bkey(struct bset_tree *t, unsigned j) |
| 438 | { |
| 439 | return (void *) (((uint64_t *) tree_to_bkey(t, j)) - t->prev[j]); |
| 440 | } |
| 441 | |
| 442 | /* |
| 443 | * For the write set - the one we're currently inserting keys into - we don't |
| 444 | * maintain a full search tree, we just keep a simple lookup table in t->prev. |
| 445 | */ |
| 446 | static struct bkey *table_to_bkey(struct bset_tree *t, unsigned cacheline) |
| 447 | { |
| 448 | return cacheline_to_bkey(t, cacheline, t->prev[cacheline]); |
| 449 | } |
| 450 | |
| 451 | static inline uint64_t shrd128(uint64_t high, uint64_t low, uint8_t shift) |
| 452 | { |
| 453 | #ifdef CONFIG_X86_64 |
| 454 | asm("shrd %[shift],%[high],%[low]" |
| 455 | : [low] "+Rm" (low) |
| 456 | : [high] "R" (high), |
| 457 | [shift] "ci" (shift) |
| 458 | : "cc"); |
| 459 | #else |
| 460 | low >>= shift; |
| 461 | low |= (high << 1) << (63U - shift); |
| 462 | #endif |
| 463 | return low; |
| 464 | } |
| 465 | |
| 466 | static inline unsigned bfloat_mantissa(const struct bkey *k, |
| 467 | struct bkey_float *f) |
| 468 | { |
| 469 | const uint64_t *p = &k->low - (f->exponent >> 6); |
| 470 | return shrd128(p[-1], p[0], f->exponent & 63) & BKEY_MANTISSA_MASK; |
| 471 | } |
| 472 | |
| 473 | static void make_bfloat(struct bset_tree *t, unsigned j) |
| 474 | { |
| 475 | struct bkey_float *f = &t->tree[j]; |
| 476 | struct bkey *m = tree_to_bkey(t, j); |
| 477 | struct bkey *p = tree_to_prev_bkey(t, j); |
| 478 | |
| 479 | struct bkey *l = is_power_of_2(j) |
| 480 | ? t->data->start |
| 481 | : tree_to_prev_bkey(t, j >> ffs(j)); |
| 482 | |
| 483 | struct bkey *r = is_power_of_2(j + 1) |
| 484 | ? node(t->data, t->data->keys - bkey_u64s(&t->end)) |
| 485 | : tree_to_bkey(t, j >> (ffz(j) + 1)); |
| 486 | |
| 487 | BUG_ON(m < l || m > r); |
| 488 | BUG_ON(bkey_next(p) != m); |
| 489 | |
| 490 | if (KEY_INODE(l) != KEY_INODE(r)) |
| 491 | f->exponent = fls64(KEY_INODE(r) ^ KEY_INODE(l)) + 64; |
| 492 | else |
| 493 | f->exponent = fls64(r->low ^ l->low); |
| 494 | |
| 495 | f->exponent = max_t(int, f->exponent - BKEY_MANTISSA_BITS, 0); |
| 496 | |
| 497 | /* |
| 498 | * Setting f->exponent = 127 flags this node as failed, and causes the |
| 499 | * lookup code to fall back to comparing against the original key. |
| 500 | */ |
| 501 | |
| 502 | if (bfloat_mantissa(m, f) != bfloat_mantissa(p, f)) |
| 503 | f->mantissa = bfloat_mantissa(m, f) - 1; |
| 504 | else |
| 505 | f->exponent = 127; |
| 506 | } |
| 507 | |
| 508 | static void bset_alloc_tree(struct btree *b, struct bset_tree *t) |
| 509 | { |
| 510 | if (t != b->sets) { |
| 511 | unsigned j = roundup(t[-1].size, |
| 512 | 64 / sizeof(struct bkey_float)); |
| 513 | |
| 514 | t->tree = t[-1].tree + j; |
| 515 | t->prev = t[-1].prev + j; |
| 516 | } |
| 517 | |
| 518 | while (t < b->sets + MAX_BSETS) |
| 519 | t++->size = 0; |
| 520 | } |
| 521 | |
| 522 | static void bset_build_unwritten_tree(struct btree *b) |
| 523 | { |
| 524 | struct bset_tree *t = b->sets + b->nsets; |
| 525 | |
| 526 | bset_alloc_tree(b, t); |
| 527 | |
| 528 | if (t->tree != b->sets->tree + bset_tree_space(b)) { |
| 529 | t->prev[0] = bkey_to_cacheline_offset(t->data->start); |
| 530 | t->size = 1; |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | static void bset_build_written_tree(struct btree *b) |
| 535 | { |
| 536 | struct bset_tree *t = b->sets + b->nsets; |
| 537 | struct bkey *k = t->data->start; |
| 538 | unsigned j, cacheline = 1; |
| 539 | |
| 540 | bset_alloc_tree(b, t); |
| 541 | |
| 542 | t->size = min_t(unsigned, |
| 543 | bkey_to_cacheline(t, end(t->data)), |
| 544 | b->sets->tree + bset_tree_space(b) - t->tree); |
| 545 | |
| 546 | if (t->size < 2) { |
| 547 | t->size = 0; |
| 548 | return; |
| 549 | } |
| 550 | |
| 551 | t->extra = (t->size - rounddown_pow_of_two(t->size - 1)) << 1; |
| 552 | |
| 553 | /* First we figure out where the first key in each cacheline is */ |
| 554 | for (j = inorder_next(0, t->size); |
| 555 | j; |
| 556 | j = inorder_next(j, t->size)) { |
| 557 | while (bkey_to_cacheline(t, k) != cacheline) |
| 558 | k = bkey_next(k); |
| 559 | |
| 560 | t->prev[j] = bkey_u64s(k); |
| 561 | k = bkey_next(k); |
| 562 | cacheline++; |
| 563 | t->tree[j].m = bkey_to_cacheline_offset(k); |
| 564 | } |
| 565 | |
| 566 | while (bkey_next(k) != end(t->data)) |
| 567 | k = bkey_next(k); |
| 568 | |
| 569 | t->end = *k; |
| 570 | |
| 571 | /* Then we build the tree */ |
| 572 | for (j = inorder_next(0, t->size); |
| 573 | j; |
| 574 | j = inorder_next(j, t->size)) |
| 575 | make_bfloat(t, j); |
| 576 | } |
| 577 | |
| 578 | void bch_bset_fix_invalidated_key(struct btree *b, struct bkey *k) |
| 579 | { |
| 580 | struct bset_tree *t; |
| 581 | unsigned inorder, j = 1; |
| 582 | |
| 583 | for (t = b->sets; t <= &b->sets[b->nsets]; t++) |
| 584 | if (k < end(t->data)) |
| 585 | goto found_set; |
| 586 | |
| 587 | BUG(); |
| 588 | found_set: |
| 589 | if (!t->size || !bset_written(b, t)) |
| 590 | return; |
| 591 | |
| 592 | inorder = bkey_to_cacheline(t, k); |
| 593 | |
| 594 | if (k == t->data->start) |
| 595 | goto fix_left; |
| 596 | |
| 597 | if (bkey_next(k) == end(t->data)) { |
| 598 | t->end = *k; |
| 599 | goto fix_right; |
| 600 | } |
| 601 | |
| 602 | j = inorder_to_tree(inorder, t); |
| 603 | |
| 604 | if (j && |
| 605 | j < t->size && |
| 606 | k == tree_to_bkey(t, j)) |
| 607 | fix_left: do { |
| 608 | make_bfloat(t, j); |
| 609 | j = j * 2; |
| 610 | } while (j < t->size); |
| 611 | |
| 612 | j = inorder_to_tree(inorder + 1, t); |
| 613 | |
| 614 | if (j && |
| 615 | j < t->size && |
| 616 | k == tree_to_prev_bkey(t, j)) |
| 617 | fix_right: do { |
| 618 | make_bfloat(t, j); |
| 619 | j = j * 2 + 1; |
| 620 | } while (j < t->size); |
| 621 | } |
| 622 | |
| 623 | void bch_bset_fix_lookup_table(struct btree *b, struct bkey *k) |
| 624 | { |
| 625 | struct bset_tree *t = &b->sets[b->nsets]; |
| 626 | unsigned shift = bkey_u64s(k); |
| 627 | unsigned j = bkey_to_cacheline(t, k); |
| 628 | |
| 629 | /* We're getting called from btree_split() or btree_gc, just bail out */ |
| 630 | if (!t->size) |
| 631 | return; |
| 632 | |
| 633 | /* k is the key we just inserted; we need to find the entry in the |
| 634 | * lookup table for the first key that is strictly greater than k: |
| 635 | * it's either k's cacheline or the next one |
| 636 | */ |
| 637 | if (j < t->size && |
| 638 | table_to_bkey(t, j) <= k) |
| 639 | j++; |
| 640 | |
| 641 | /* Adjust all the lookup table entries, and find a new key for any that |
| 642 | * have gotten too big |
| 643 | */ |
| 644 | for (; j < t->size; j++) { |
| 645 | t->prev[j] += shift; |
| 646 | |
| 647 | if (t->prev[j] > 7) { |
| 648 | k = table_to_bkey(t, j - 1); |
| 649 | |
| 650 | while (k < cacheline_to_bkey(t, j, 0)) |
| 651 | k = bkey_next(k); |
| 652 | |
| 653 | t->prev[j] = bkey_to_cacheline_offset(k); |
| 654 | } |
| 655 | } |
| 656 | |
| 657 | if (t->size == b->sets->tree + bset_tree_space(b) - t->tree) |
| 658 | return; |
| 659 | |
| 660 | /* Possibly add a new entry to the end of the lookup table */ |
| 661 | |
| 662 | for (k = table_to_bkey(t, t->size - 1); |
| 663 | k != end(t->data); |
| 664 | k = bkey_next(k)) |
| 665 | if (t->size == bkey_to_cacheline(t, k)) { |
| 666 | t->prev[t->size] = bkey_to_cacheline_offset(k); |
| 667 | t->size++; |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | void bch_bset_init_next(struct btree *b) |
| 672 | { |
| 673 | struct bset *i = write_block(b); |
| 674 | |
| 675 | if (i != b->sets[0].data) { |
| 676 | b->sets[++b->nsets].data = i; |
| 677 | i->seq = b->sets[0].data->seq; |
| 678 | } else |
| 679 | get_random_bytes(&i->seq, sizeof(uint64_t)); |
| 680 | |
| 681 | i->magic = bset_magic(b->c); |
| 682 | i->version = 0; |
| 683 | i->keys = 0; |
| 684 | |
| 685 | bset_build_unwritten_tree(b); |
| 686 | } |
| 687 | |
| 688 | struct bset_search_iter { |
| 689 | struct bkey *l, *r; |
| 690 | }; |
| 691 | |
| 692 | static struct bset_search_iter bset_search_write_set(struct btree *b, |
| 693 | struct bset_tree *t, |
| 694 | const struct bkey *search) |
| 695 | { |
| 696 | unsigned li = 0, ri = t->size; |
| 697 | |
| 698 | BUG_ON(!b->nsets && |
| 699 | t->size < bkey_to_cacheline(t, end(t->data))); |
| 700 | |
| 701 | while (li + 1 != ri) { |
| 702 | unsigned m = (li + ri) >> 1; |
| 703 | |
| 704 | if (bkey_cmp(table_to_bkey(t, m), search) > 0) |
| 705 | ri = m; |
| 706 | else |
| 707 | li = m; |
| 708 | } |
| 709 | |
| 710 | return (struct bset_search_iter) { |
| 711 | table_to_bkey(t, li), |
| 712 | ri < t->size ? table_to_bkey(t, ri) : end(t->data) |
| 713 | }; |
| 714 | } |
| 715 | |
| 716 | static struct bset_search_iter bset_search_tree(struct btree *b, |
| 717 | struct bset_tree *t, |
| 718 | const struct bkey *search) |
| 719 | { |
| 720 | struct bkey *l, *r; |
| 721 | struct bkey_float *f; |
| 722 | unsigned inorder, j, n = 1; |
| 723 | |
| 724 | do { |
| 725 | unsigned p = n << 4; |
| 726 | p &= ((int) (p - t->size)) >> 31; |
| 727 | |
| 728 | prefetch(&t->tree[p]); |
| 729 | |
| 730 | j = n; |
| 731 | f = &t->tree[j]; |
| 732 | |
| 733 | /* |
| 734 | * n = (f->mantissa > bfloat_mantissa()) |
| 735 | * ? j * 2 |
| 736 | * : j * 2 + 1; |
| 737 | * |
| 738 | * We need to subtract 1 from f->mantissa for the sign bit trick |
| 739 | * to work - that's done in make_bfloat() |
| 740 | */ |
| 741 | if (likely(f->exponent != 127)) |
| 742 | n = j * 2 + (((unsigned) |
| 743 | (f->mantissa - |
| 744 | bfloat_mantissa(search, f))) >> 31); |
| 745 | else |
| 746 | n = (bkey_cmp(tree_to_bkey(t, j), search) > 0) |
| 747 | ? j * 2 |
| 748 | : j * 2 + 1; |
| 749 | } while (n < t->size); |
| 750 | |
| 751 | inorder = to_inorder(j, t); |
| 752 | |
| 753 | /* |
| 754 | * n would have been the node we recursed to - the low bit tells us if |
| 755 | * we recursed left or recursed right. |
| 756 | */ |
| 757 | if (n & 1) { |
| 758 | l = cacheline_to_bkey(t, inorder, f->m); |
| 759 | |
| 760 | if (++inorder != t->size) { |
| 761 | f = &t->tree[inorder_next(j, t->size)]; |
| 762 | r = cacheline_to_bkey(t, inorder, f->m); |
| 763 | } else |
| 764 | r = end(t->data); |
| 765 | } else { |
| 766 | r = cacheline_to_bkey(t, inorder, f->m); |
| 767 | |
| 768 | if (--inorder) { |
| 769 | f = &t->tree[inorder_prev(j, t->size)]; |
| 770 | l = cacheline_to_bkey(t, inorder, f->m); |
| 771 | } else |
| 772 | l = t->data->start; |
| 773 | } |
| 774 | |
| 775 | return (struct bset_search_iter) {l, r}; |
| 776 | } |
| 777 | |
| 778 | struct bkey *__bch_bset_search(struct btree *b, struct bset_tree *t, |
| 779 | const struct bkey *search) |
| 780 | { |
| 781 | struct bset_search_iter i; |
| 782 | |
| 783 | /* |
| 784 | * First, we search for a cacheline, then lastly we do a linear search |
| 785 | * within that cacheline. |
| 786 | * |
| 787 | * To search for the cacheline, there's three different possibilities: |
| 788 | * * The set is too small to have a search tree, so we just do a linear |
| 789 | * search over the whole set. |
| 790 | * * The set is the one we're currently inserting into; keeping a full |
| 791 | * auxiliary search tree up to date would be too expensive, so we |
| 792 | * use a much simpler lookup table to do a binary search - |
| 793 | * bset_search_write_set(). |
| 794 | * * Or we use the auxiliary search tree we constructed earlier - |
| 795 | * bset_search_tree() |
| 796 | */ |
| 797 | |
| 798 | if (unlikely(!t->size)) { |
| 799 | i.l = t->data->start; |
| 800 | i.r = end(t->data); |
| 801 | } else if (bset_written(b, t)) { |
| 802 | /* |
| 803 | * Each node in the auxiliary search tree covers a certain range |
| 804 | * of bits, and keys above and below the set it covers might |
| 805 | * differ outside those bits - so we have to special case the |
| 806 | * start and end - handle that here: |
| 807 | */ |
| 808 | |
| 809 | if (unlikely(bkey_cmp(search, &t->end) >= 0)) |
| 810 | return end(t->data); |
| 811 | |
| 812 | if (unlikely(bkey_cmp(search, t->data->start) < 0)) |
| 813 | return t->data->start; |
| 814 | |
| 815 | i = bset_search_tree(b, t, search); |
| 816 | } else |
| 817 | i = bset_search_write_set(b, t, search); |
| 818 | |
| 819 | #ifdef CONFIG_BCACHE_EDEBUG |
| 820 | BUG_ON(bset_written(b, t) && |
| 821 | i.l != t->data->start && |
| 822 | bkey_cmp(tree_to_prev_bkey(t, |
| 823 | inorder_to_tree(bkey_to_cacheline(t, i.l), t)), |
| 824 | search) > 0); |
| 825 | |
| 826 | BUG_ON(i.r != end(t->data) && |
| 827 | bkey_cmp(i.r, search) <= 0); |
| 828 | #endif |
| 829 | |
| 830 | while (likely(i.l != i.r) && |
| 831 | bkey_cmp(i.l, search) <= 0) |
| 832 | i.l = bkey_next(i.l); |
| 833 | |
| 834 | return i.l; |
| 835 | } |
| 836 | |
| 837 | /* Btree iterator */ |
| 838 | |
| 839 | static inline bool btree_iter_cmp(struct btree_iter_set l, |
| 840 | struct btree_iter_set r) |
| 841 | { |
| 842 | int64_t c = bkey_cmp(&START_KEY(l.k), &START_KEY(r.k)); |
| 843 | |
| 844 | return c ? c > 0 : l.k < r.k; |
| 845 | } |
| 846 | |
| 847 | static inline bool btree_iter_end(struct btree_iter *iter) |
| 848 | { |
| 849 | return !iter->used; |
| 850 | } |
| 851 | |
| 852 | void bch_btree_iter_push(struct btree_iter *iter, struct bkey *k, |
| 853 | struct bkey *end) |
| 854 | { |
| 855 | if (k != end) |
| 856 | BUG_ON(!heap_add(iter, |
| 857 | ((struct btree_iter_set) { k, end }), |
| 858 | btree_iter_cmp)); |
| 859 | } |
| 860 | |
| 861 | struct bkey *__bch_btree_iter_init(struct btree *b, struct btree_iter *iter, |
| 862 | struct bkey *search, struct bset_tree *start) |
| 863 | { |
| 864 | struct bkey *ret = NULL; |
| 865 | iter->size = ARRAY_SIZE(iter->data); |
| 866 | iter->used = 0; |
| 867 | |
| 868 | for (; start <= &b->sets[b->nsets]; start++) { |
| 869 | ret = bch_bset_search(b, start, search); |
| 870 | bch_btree_iter_push(iter, ret, end(start->data)); |
| 871 | } |
| 872 | |
| 873 | return ret; |
| 874 | } |
| 875 | |
| 876 | struct bkey *bch_btree_iter_next(struct btree_iter *iter) |
| 877 | { |
| 878 | struct btree_iter_set unused; |
| 879 | struct bkey *ret = NULL; |
| 880 | |
| 881 | if (!btree_iter_end(iter)) { |
| 882 | ret = iter->data->k; |
| 883 | iter->data->k = bkey_next(iter->data->k); |
| 884 | |
| 885 | if (iter->data->k > iter->data->end) { |
Kent Overstreet | cc0f4ea | 2013-03-27 12:47:45 -0700 | [diff] [blame] | 886 | WARN_ONCE(1, "bset was corrupt!\n"); |
Kent Overstreet | cafe563 | 2013-03-23 16:11:31 -0700 | [diff] [blame] | 887 | iter->data->k = iter->data->end; |
| 888 | } |
| 889 | |
| 890 | if (iter->data->k == iter->data->end) |
| 891 | heap_pop(iter, unused, btree_iter_cmp); |
| 892 | else |
| 893 | heap_sift(iter, 0, btree_iter_cmp); |
| 894 | } |
| 895 | |
| 896 | return ret; |
| 897 | } |
| 898 | |
| 899 | struct bkey *bch_btree_iter_next_filter(struct btree_iter *iter, |
| 900 | struct btree *b, ptr_filter_fn fn) |
| 901 | { |
| 902 | struct bkey *ret; |
| 903 | |
| 904 | do { |
| 905 | ret = bch_btree_iter_next(iter); |
| 906 | } while (ret && fn(b, ret)); |
| 907 | |
| 908 | return ret; |
| 909 | } |
| 910 | |
| 911 | struct bkey *bch_next_recurse_key(struct btree *b, struct bkey *search) |
| 912 | { |
| 913 | struct btree_iter iter; |
| 914 | |
| 915 | bch_btree_iter_init(b, &iter, search); |
| 916 | return bch_btree_iter_next_filter(&iter, b, bch_ptr_bad); |
| 917 | } |
| 918 | |
| 919 | /* Mergesort */ |
| 920 | |
| 921 | static void btree_sort_fixup(struct btree_iter *iter) |
| 922 | { |
| 923 | while (iter->used > 1) { |
| 924 | struct btree_iter_set *top = iter->data, *i = top + 1; |
| 925 | struct bkey *k; |
| 926 | |
| 927 | if (iter->used > 2 && |
| 928 | btree_iter_cmp(i[0], i[1])) |
| 929 | i++; |
| 930 | |
| 931 | for (k = i->k; |
| 932 | k != i->end && bkey_cmp(top->k, &START_KEY(k)) > 0; |
| 933 | k = bkey_next(k)) |
| 934 | if (top->k > i->k) |
| 935 | __bch_cut_front(top->k, k); |
| 936 | else if (KEY_SIZE(k)) |
| 937 | bch_cut_back(&START_KEY(k), top->k); |
| 938 | |
| 939 | if (top->k < i->k || k == i->k) |
| 940 | break; |
| 941 | |
| 942 | heap_sift(iter, i - top, btree_iter_cmp); |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | static void btree_mergesort(struct btree *b, struct bset *out, |
| 947 | struct btree_iter *iter, |
| 948 | bool fixup, bool remove_stale) |
| 949 | { |
| 950 | struct bkey *k, *last = NULL; |
| 951 | bool (*bad)(struct btree *, const struct bkey *) = remove_stale |
| 952 | ? bch_ptr_bad |
| 953 | : bch_ptr_invalid; |
| 954 | |
| 955 | while (!btree_iter_end(iter)) { |
| 956 | if (fixup && !b->level) |
| 957 | btree_sort_fixup(iter); |
| 958 | |
| 959 | k = bch_btree_iter_next(iter); |
| 960 | if (bad(b, k)) |
| 961 | continue; |
| 962 | |
| 963 | if (!last) { |
| 964 | last = out->start; |
| 965 | bkey_copy(last, k); |
| 966 | } else if (b->level || |
| 967 | !bch_bkey_try_merge(b, last, k)) { |
| 968 | last = bkey_next(last); |
| 969 | bkey_copy(last, k); |
| 970 | } |
| 971 | } |
| 972 | |
| 973 | out->keys = last ? (uint64_t *) bkey_next(last) - out->d : 0; |
| 974 | |
| 975 | pr_debug("sorted %i keys", out->keys); |
| 976 | bch_check_key_order(b, out); |
| 977 | } |
| 978 | |
| 979 | static void __btree_sort(struct btree *b, struct btree_iter *iter, |
| 980 | unsigned start, unsigned order, bool fixup) |
| 981 | { |
| 982 | uint64_t start_time; |
| 983 | bool remove_stale = !b->written; |
| 984 | struct bset *out = (void *) __get_free_pages(__GFP_NOWARN|GFP_NOIO, |
| 985 | order); |
| 986 | if (!out) { |
| 987 | mutex_lock(&b->c->sort_lock); |
| 988 | out = b->c->sort; |
| 989 | order = ilog2(bucket_pages(b->c)); |
| 990 | } |
| 991 | |
| 992 | start_time = local_clock(); |
| 993 | |
| 994 | btree_mergesort(b, out, iter, fixup, remove_stale); |
| 995 | b->nsets = start; |
| 996 | |
| 997 | if (!fixup && !start && b->written) |
| 998 | bch_btree_verify(b, out); |
| 999 | |
| 1000 | if (!start && order == b->page_order) { |
| 1001 | /* |
| 1002 | * Our temporary buffer is the same size as the btree node's |
| 1003 | * buffer, we can just swap buffers instead of doing a big |
| 1004 | * memcpy() |
| 1005 | */ |
| 1006 | |
| 1007 | out->magic = bset_magic(b->c); |
| 1008 | out->seq = b->sets[0].data->seq; |
| 1009 | out->version = b->sets[0].data->version; |
| 1010 | swap(out, b->sets[0].data); |
| 1011 | |
| 1012 | if (b->c->sort == b->sets[0].data) |
| 1013 | b->c->sort = out; |
| 1014 | } else { |
| 1015 | b->sets[start].data->keys = out->keys; |
| 1016 | memcpy(b->sets[start].data->start, out->start, |
| 1017 | (void *) end(out) - (void *) out->start); |
| 1018 | } |
| 1019 | |
| 1020 | if (out == b->c->sort) |
| 1021 | mutex_unlock(&b->c->sort_lock); |
| 1022 | else |
| 1023 | free_pages((unsigned long) out, order); |
| 1024 | |
| 1025 | if (b->written) |
| 1026 | bset_build_written_tree(b); |
| 1027 | |
| 1028 | if (!start) { |
| 1029 | spin_lock(&b->c->sort_time_lock); |
Kent Overstreet | 169ef1c | 2013-03-28 12:50:55 -0600 | [diff] [blame] | 1030 | bch_time_stats_update(&b->c->sort_time, start_time); |
Kent Overstreet | cafe563 | 2013-03-23 16:11:31 -0700 | [diff] [blame] | 1031 | spin_unlock(&b->c->sort_time_lock); |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | void bch_btree_sort_partial(struct btree *b, unsigned start) |
| 1036 | { |
| 1037 | size_t oldsize = 0, order = b->page_order, keys = 0; |
| 1038 | struct btree_iter iter; |
| 1039 | __bch_btree_iter_init(b, &iter, NULL, &b->sets[start]); |
| 1040 | |
| 1041 | BUG_ON(b->sets[b->nsets].data == write_block(b) && |
| 1042 | (b->sets[b->nsets].size || b->nsets)); |
| 1043 | |
| 1044 | if (b->written) |
| 1045 | oldsize = bch_count_data(b); |
| 1046 | |
| 1047 | if (start) { |
| 1048 | unsigned i; |
| 1049 | |
| 1050 | for (i = start; i <= b->nsets; i++) |
| 1051 | keys += b->sets[i].data->keys; |
| 1052 | |
Kent Overstreet | b1a67b0 | 2013-03-25 11:46:44 -0700 | [diff] [blame] | 1053 | order = roundup_pow_of_two(__set_bytes(b->sets->data, |
| 1054 | keys)) / PAGE_SIZE; |
Kent Overstreet | cafe563 | 2013-03-23 16:11:31 -0700 | [diff] [blame] | 1055 | if (order) |
| 1056 | order = ilog2(order); |
| 1057 | } |
| 1058 | |
| 1059 | __btree_sort(b, &iter, start, order, false); |
| 1060 | |
| 1061 | EBUG_ON(b->written && bch_count_data(b) != oldsize); |
| 1062 | } |
| 1063 | |
| 1064 | void bch_btree_sort_and_fix_extents(struct btree *b, struct btree_iter *iter) |
| 1065 | { |
| 1066 | BUG_ON(!b->written); |
| 1067 | __btree_sort(b, iter, 0, b->page_order, true); |
| 1068 | } |
| 1069 | |
| 1070 | void bch_btree_sort_into(struct btree *b, struct btree *new) |
| 1071 | { |
| 1072 | uint64_t start_time = local_clock(); |
| 1073 | |
| 1074 | struct btree_iter iter; |
| 1075 | bch_btree_iter_init(b, &iter, NULL); |
| 1076 | |
| 1077 | btree_mergesort(b, new->sets->data, &iter, false, true); |
| 1078 | |
| 1079 | spin_lock(&b->c->sort_time_lock); |
Kent Overstreet | 169ef1c | 2013-03-28 12:50:55 -0600 | [diff] [blame] | 1080 | bch_time_stats_update(&b->c->sort_time, start_time); |
Kent Overstreet | cafe563 | 2013-03-23 16:11:31 -0700 | [diff] [blame] | 1081 | spin_unlock(&b->c->sort_time_lock); |
| 1082 | |
| 1083 | bkey_copy_key(&new->key, &b->key); |
| 1084 | new->sets->size = 0; |
| 1085 | } |
| 1086 | |
| 1087 | void bch_btree_sort_lazy(struct btree *b) |
| 1088 | { |
| 1089 | if (b->nsets) { |
| 1090 | unsigned i, j, keys = 0, total; |
| 1091 | |
| 1092 | for (i = 0; i <= b->nsets; i++) |
| 1093 | keys += b->sets[i].data->keys; |
| 1094 | |
| 1095 | total = keys; |
| 1096 | |
| 1097 | for (j = 0; j < b->nsets; j++) { |
| 1098 | if (keys * 2 < total || |
| 1099 | keys < 1000) { |
| 1100 | bch_btree_sort_partial(b, j); |
| 1101 | return; |
| 1102 | } |
| 1103 | |
| 1104 | keys -= b->sets[j].data->keys; |
| 1105 | } |
| 1106 | |
| 1107 | /* Must sort if b->nsets == 3 or we'll overflow */ |
| 1108 | if (b->nsets >= (MAX_BSETS - 1) - b->level) { |
| 1109 | bch_btree_sort(b); |
| 1110 | return; |
| 1111 | } |
| 1112 | } |
| 1113 | |
| 1114 | bset_build_written_tree(b); |
| 1115 | } |
| 1116 | |
| 1117 | /* Sysfs stuff */ |
| 1118 | |
| 1119 | struct bset_stats { |
| 1120 | size_t nodes; |
| 1121 | size_t sets_written, sets_unwritten; |
| 1122 | size_t bytes_written, bytes_unwritten; |
| 1123 | size_t floats, failed; |
| 1124 | }; |
| 1125 | |
| 1126 | static int bch_btree_bset_stats(struct btree *b, struct btree_op *op, |
| 1127 | struct bset_stats *stats) |
| 1128 | { |
| 1129 | struct bkey *k; |
| 1130 | unsigned i; |
| 1131 | |
| 1132 | stats->nodes++; |
| 1133 | |
| 1134 | for (i = 0; i <= b->nsets; i++) { |
| 1135 | struct bset_tree *t = &b->sets[i]; |
| 1136 | size_t bytes = t->data->keys * sizeof(uint64_t); |
| 1137 | size_t j; |
| 1138 | |
| 1139 | if (bset_written(b, t)) { |
| 1140 | stats->sets_written++; |
| 1141 | stats->bytes_written += bytes; |
| 1142 | |
| 1143 | stats->floats += t->size - 1; |
| 1144 | |
| 1145 | for (j = 1; j < t->size; j++) |
| 1146 | if (t->tree[j].exponent == 127) |
| 1147 | stats->failed++; |
| 1148 | } else { |
| 1149 | stats->sets_unwritten++; |
| 1150 | stats->bytes_unwritten += bytes; |
| 1151 | } |
| 1152 | } |
| 1153 | |
| 1154 | if (b->level) { |
| 1155 | struct btree_iter iter; |
| 1156 | |
| 1157 | for_each_key_filter(b, k, &iter, bch_ptr_bad) { |
| 1158 | int ret = btree(bset_stats, k, b, op, stats); |
| 1159 | if (ret) |
| 1160 | return ret; |
| 1161 | } |
| 1162 | } |
| 1163 | |
| 1164 | return 0; |
| 1165 | } |
| 1166 | |
| 1167 | int bch_bset_print_stats(struct cache_set *c, char *buf) |
| 1168 | { |
| 1169 | struct btree_op op; |
| 1170 | struct bset_stats t; |
| 1171 | int ret; |
| 1172 | |
| 1173 | bch_btree_op_init_stack(&op); |
| 1174 | memset(&t, 0, sizeof(struct bset_stats)); |
| 1175 | |
| 1176 | ret = btree_root(bset_stats, c, &op, &t); |
| 1177 | if (ret) |
| 1178 | return ret; |
| 1179 | |
| 1180 | return snprintf(buf, PAGE_SIZE, |
| 1181 | "btree nodes: %zu\n" |
| 1182 | "written sets: %zu\n" |
| 1183 | "unwritten sets: %zu\n" |
| 1184 | "written key bytes: %zu\n" |
| 1185 | "unwritten key bytes: %zu\n" |
| 1186 | "floats: %zu\n" |
| 1187 | "failed: %zu\n", |
| 1188 | t.nodes, |
| 1189 | t.sets_written, t.sets_unwritten, |
| 1190 | t.bytes_written, t.bytes_unwritten, |
| 1191 | t.floats, t.failed); |
| 1192 | } |