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428870ff BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. | |
24 | */ | |
25 | ||
26 | #include <sys/zfs_context.h> | |
27 | #include <sys/spa.h> | |
28 | #include <sys/spa_impl.h> | |
29 | #include <sys/zio.h> | |
30 | #include <sys/ddt.h> | |
31 | #include <sys/zap.h> | |
32 | #include <sys/dmu_tx.h> | |
33 | #include <sys/arc.h> | |
34 | #include <sys/dsl_pool.h> | |
35 | #include <sys/zio_checksum.h> | |
36 | #include <sys/zio_compress.h> | |
37 | #include <sys/dsl_scan.h> | |
38 | ||
572e2857 BB |
39 | /* |
40 | * Enable/disable prefetching of dedup-ed blocks which are going to be freed. | |
41 | */ | |
42 | int zfs_dedup_prefetch = 1; | |
43 | ||
428870ff BB |
44 | static const ddt_ops_t *ddt_ops[DDT_TYPES] = { |
45 | &ddt_zap_ops, | |
46 | }; | |
47 | ||
48 | static const char *ddt_class_name[DDT_CLASSES] = { | |
49 | "ditto", | |
50 | "duplicate", | |
51 | "unique", | |
52 | }; | |
53 | ||
54 | static void | |
55 | ddt_object_create(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
56 | dmu_tx_t *tx) | |
57 | { | |
58 | spa_t *spa = ddt->ddt_spa; | |
59 | objset_t *os = ddt->ddt_os; | |
60 | uint64_t *objectp = &ddt->ddt_object[type][class]; | |
61 | boolean_t prehash = zio_checksum_table[ddt->ddt_checksum].ci_dedup; | |
62 | char name[DDT_NAMELEN]; | |
63 | ||
64 | ddt_object_name(ddt, type, class, name); | |
65 | ||
66 | ASSERT(*objectp == 0); | |
67 | VERIFY(ddt_ops[type]->ddt_op_create(os, objectp, tx, prehash) == 0); | |
68 | ASSERT(*objectp != 0); | |
69 | ||
70 | VERIFY(zap_add(os, DMU_POOL_DIRECTORY_OBJECT, name, | |
71 | sizeof (uint64_t), 1, objectp, tx) == 0); | |
72 | ||
73 | VERIFY(zap_add(os, spa->spa_ddt_stat_object, name, | |
74 | sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t), | |
75 | &ddt->ddt_histogram[type][class], tx) == 0); | |
76 | } | |
77 | ||
78 | static void | |
79 | ddt_object_destroy(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
80 | dmu_tx_t *tx) | |
81 | { | |
82 | spa_t *spa = ddt->ddt_spa; | |
83 | objset_t *os = ddt->ddt_os; | |
84 | uint64_t *objectp = &ddt->ddt_object[type][class]; | |
85 | char name[DDT_NAMELEN]; | |
86 | ||
87 | ddt_object_name(ddt, type, class, name); | |
88 | ||
89 | ASSERT(*objectp != 0); | |
90 | ASSERT(ddt_object_count(ddt, type, class) == 0); | |
91 | ASSERT(ddt_histogram_empty(&ddt->ddt_histogram[type][class])); | |
92 | VERIFY(zap_remove(os, DMU_POOL_DIRECTORY_OBJECT, name, tx) == 0); | |
93 | VERIFY(zap_remove(os, spa->spa_ddt_stat_object, name, tx) == 0); | |
94 | VERIFY(ddt_ops[type]->ddt_op_destroy(os, *objectp, tx) == 0); | |
95 | bzero(&ddt->ddt_object_stats[type][class], sizeof (ddt_object_t)); | |
96 | ||
97 | *objectp = 0; | |
98 | } | |
99 | ||
100 | static int | |
101 | ddt_object_load(ddt_t *ddt, enum ddt_type type, enum ddt_class class) | |
102 | { | |
103 | ddt_object_t *ddo = &ddt->ddt_object_stats[type][class]; | |
104 | dmu_object_info_t doi; | |
105 | char name[DDT_NAMELEN]; | |
106 | int error; | |
107 | ||
108 | ddt_object_name(ddt, type, class, name); | |
109 | ||
110 | error = zap_lookup(ddt->ddt_os, DMU_POOL_DIRECTORY_OBJECT, name, | |
111 | sizeof (uint64_t), 1, &ddt->ddt_object[type][class]); | |
112 | ||
113 | if (error) | |
114 | return (error); | |
115 | ||
116 | error = zap_lookup(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name, | |
117 | sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t), | |
118 | &ddt->ddt_histogram[type][class]); | |
119 | ||
120 | /* | |
121 | * Seed the cached statistics. | |
122 | */ | |
2a4a9dc2 BB |
123 | error = ddt_object_info(ddt, type, class, &doi); |
124 | if (error) | |
125 | return (error); | |
428870ff BB |
126 | |
127 | ddo->ddo_count = ddt_object_count(ddt, type, class); | |
128 | ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9; | |
129 | ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size; | |
130 | ||
131 | ASSERT(error == 0); | |
132 | return (error); | |
133 | } | |
134 | ||
135 | static void | |
136 | ddt_object_sync(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
137 | dmu_tx_t *tx) | |
138 | { | |
139 | ddt_object_t *ddo = &ddt->ddt_object_stats[type][class]; | |
140 | dmu_object_info_t doi; | |
141 | char name[DDT_NAMELEN]; | |
142 | ||
143 | ddt_object_name(ddt, type, class, name); | |
144 | ||
145 | VERIFY(zap_update(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name, | |
146 | sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t), | |
147 | &ddt->ddt_histogram[type][class], tx) == 0); | |
148 | ||
149 | /* | |
150 | * Cache DDT statistics; this is the only time they'll change. | |
151 | */ | |
152 | VERIFY(ddt_object_info(ddt, type, class, &doi) == 0); | |
153 | ||
154 | ddo->ddo_count = ddt_object_count(ddt, type, class); | |
155 | ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9; | |
156 | ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size; | |
157 | } | |
158 | ||
159 | static int | |
160 | ddt_object_lookup(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
161 | ddt_entry_t *dde) | |
162 | { | |
163 | if (!ddt_object_exists(ddt, type, class)) | |
164 | return (ENOENT); | |
165 | ||
166 | return (ddt_ops[type]->ddt_op_lookup(ddt->ddt_os, | |
167 | ddt->ddt_object[type][class], dde)); | |
168 | } | |
169 | ||
170 | static void | |
171 | ddt_object_prefetch(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
172 | ddt_entry_t *dde) | |
173 | { | |
174 | if (!ddt_object_exists(ddt, type, class)) | |
175 | return; | |
176 | ||
177 | ddt_ops[type]->ddt_op_prefetch(ddt->ddt_os, | |
178 | ddt->ddt_object[type][class], dde); | |
179 | } | |
180 | ||
181 | int | |
182 | ddt_object_update(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
183 | ddt_entry_t *dde, dmu_tx_t *tx) | |
184 | { | |
185 | ASSERT(ddt_object_exists(ddt, type, class)); | |
186 | ||
187 | return (ddt_ops[type]->ddt_op_update(ddt->ddt_os, | |
188 | ddt->ddt_object[type][class], dde, tx)); | |
189 | } | |
190 | ||
191 | static int | |
192 | ddt_object_remove(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
193 | ddt_entry_t *dde, dmu_tx_t *tx) | |
194 | { | |
195 | ASSERT(ddt_object_exists(ddt, type, class)); | |
196 | ||
197 | return (ddt_ops[type]->ddt_op_remove(ddt->ddt_os, | |
198 | ddt->ddt_object[type][class], dde, tx)); | |
199 | } | |
200 | ||
201 | int | |
202 | ddt_object_walk(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
203 | uint64_t *walk, ddt_entry_t *dde) | |
204 | { | |
205 | ASSERT(ddt_object_exists(ddt, type, class)); | |
206 | ||
207 | return (ddt_ops[type]->ddt_op_walk(ddt->ddt_os, | |
208 | ddt->ddt_object[type][class], dde, walk)); | |
209 | } | |
210 | ||
211 | uint64_t | |
212 | ddt_object_count(ddt_t *ddt, enum ddt_type type, enum ddt_class class) | |
213 | { | |
214 | ASSERT(ddt_object_exists(ddt, type, class)); | |
215 | ||
216 | return (ddt_ops[type]->ddt_op_count(ddt->ddt_os, | |
217 | ddt->ddt_object[type][class])); | |
218 | } | |
219 | ||
220 | int | |
221 | ddt_object_info(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
222 | dmu_object_info_t *doi) | |
223 | { | |
224 | if (!ddt_object_exists(ddt, type, class)) | |
225 | return (ENOENT); | |
226 | ||
227 | return (dmu_object_info(ddt->ddt_os, ddt->ddt_object[type][class], | |
228 | doi)); | |
229 | } | |
230 | ||
231 | boolean_t | |
232 | ddt_object_exists(ddt_t *ddt, enum ddt_type type, enum ddt_class class) | |
233 | { | |
234 | return (!!ddt->ddt_object[type][class]); | |
235 | } | |
236 | ||
237 | void | |
238 | ddt_object_name(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
239 | char *name) | |
240 | { | |
241 | (void) sprintf(name, DMU_POOL_DDT, | |
242 | zio_checksum_table[ddt->ddt_checksum].ci_name, | |
243 | ddt_ops[type]->ddt_op_name, ddt_class_name[class]); | |
244 | } | |
245 | ||
246 | void | |
247 | ddt_bp_fill(const ddt_phys_t *ddp, blkptr_t *bp, uint64_t txg) | |
248 | { | |
d6320ddb | 249 | int d; |
428870ff BB |
250 | ASSERT(txg != 0); |
251 | ||
d6320ddb | 252 | for (d = 0; d < SPA_DVAS_PER_BP; d++) |
428870ff BB |
253 | bp->blk_dva[d] = ddp->ddp_dva[d]; |
254 | BP_SET_BIRTH(bp, txg, ddp->ddp_phys_birth); | |
255 | } | |
256 | ||
257 | void | |
258 | ddt_bp_create(enum zio_checksum checksum, | |
259 | const ddt_key_t *ddk, const ddt_phys_t *ddp, blkptr_t *bp) | |
260 | { | |
261 | BP_ZERO(bp); | |
262 | ||
263 | if (ddp != NULL) | |
264 | ddt_bp_fill(ddp, bp, ddp->ddp_phys_birth); | |
265 | ||
266 | bp->blk_cksum = ddk->ddk_cksum; | |
267 | bp->blk_fill = 1; | |
268 | ||
269 | BP_SET_LSIZE(bp, DDK_GET_LSIZE(ddk)); | |
270 | BP_SET_PSIZE(bp, DDK_GET_PSIZE(ddk)); | |
271 | BP_SET_COMPRESS(bp, DDK_GET_COMPRESS(ddk)); | |
272 | BP_SET_CHECKSUM(bp, checksum); | |
273 | BP_SET_TYPE(bp, DMU_OT_DEDUP); | |
274 | BP_SET_LEVEL(bp, 0); | |
275 | BP_SET_DEDUP(bp, 0); | |
276 | BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); | |
277 | } | |
278 | ||
279 | void | |
280 | ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp) | |
281 | { | |
282 | ddk->ddk_cksum = bp->blk_cksum; | |
283 | ddk->ddk_prop = 0; | |
284 | ||
285 | DDK_SET_LSIZE(ddk, BP_GET_LSIZE(bp)); | |
286 | DDK_SET_PSIZE(ddk, BP_GET_PSIZE(bp)); | |
287 | DDK_SET_COMPRESS(ddk, BP_GET_COMPRESS(bp)); | |
288 | } | |
289 | ||
290 | void | |
291 | ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp) | |
292 | { | |
d6320ddb | 293 | int d; |
428870ff BB |
294 | ASSERT(ddp->ddp_phys_birth == 0); |
295 | ||
d6320ddb | 296 | for (d = 0; d < SPA_DVAS_PER_BP; d++) |
428870ff BB |
297 | ddp->ddp_dva[d] = bp->blk_dva[d]; |
298 | ddp->ddp_phys_birth = BP_PHYSICAL_BIRTH(bp); | |
299 | } | |
300 | ||
301 | void | |
302 | ddt_phys_clear(ddt_phys_t *ddp) | |
303 | { | |
304 | bzero(ddp, sizeof (*ddp)); | |
305 | } | |
306 | ||
307 | void | |
308 | ddt_phys_addref(ddt_phys_t *ddp) | |
309 | { | |
310 | ddp->ddp_refcnt++; | |
311 | } | |
312 | ||
313 | void | |
314 | ddt_phys_decref(ddt_phys_t *ddp) | |
315 | { | |
316 | ASSERT((int64_t)ddp->ddp_refcnt > 0); | |
317 | ddp->ddp_refcnt--; | |
318 | } | |
319 | ||
320 | void | |
321 | ddt_phys_free(ddt_t *ddt, ddt_key_t *ddk, ddt_phys_t *ddp, uint64_t txg) | |
322 | { | |
323 | blkptr_t blk; | |
324 | ||
325 | ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk); | |
326 | ddt_phys_clear(ddp); | |
327 | zio_free(ddt->ddt_spa, txg, &blk); | |
328 | } | |
329 | ||
330 | ddt_phys_t * | |
331 | ddt_phys_select(const ddt_entry_t *dde, const blkptr_t *bp) | |
332 | { | |
333 | ddt_phys_t *ddp = (ddt_phys_t *)dde->dde_phys; | |
d6320ddb | 334 | int p; |
428870ff | 335 | |
d6320ddb | 336 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
337 | if (DVA_EQUAL(BP_IDENTITY(bp), &ddp->ddp_dva[0]) && |
338 | BP_PHYSICAL_BIRTH(bp) == ddp->ddp_phys_birth) | |
339 | return (ddp); | |
340 | } | |
341 | return (NULL); | |
342 | } | |
343 | ||
344 | uint64_t | |
345 | ddt_phys_total_refcnt(const ddt_entry_t *dde) | |
346 | { | |
347 | uint64_t refcnt = 0; | |
d6320ddb | 348 | int p; |
428870ff | 349 | |
d6320ddb | 350 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) |
428870ff BB |
351 | refcnt += dde->dde_phys[p].ddp_refcnt; |
352 | ||
353 | return (refcnt); | |
354 | } | |
355 | ||
356 | static void | |
357 | ddt_stat_generate(ddt_t *ddt, ddt_entry_t *dde, ddt_stat_t *dds) | |
358 | { | |
359 | spa_t *spa = ddt->ddt_spa; | |
360 | ddt_phys_t *ddp = dde->dde_phys; | |
361 | ddt_key_t *ddk = &dde->dde_key; | |
362 | uint64_t lsize = DDK_GET_LSIZE(ddk); | |
363 | uint64_t psize = DDK_GET_PSIZE(ddk); | |
d6320ddb | 364 | int p, d; |
428870ff BB |
365 | |
366 | bzero(dds, sizeof (*dds)); | |
367 | ||
d6320ddb | 368 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
369 | uint64_t dsize = 0; |
370 | uint64_t refcnt = ddp->ddp_refcnt; | |
371 | ||
372 | if (ddp->ddp_phys_birth == 0) | |
373 | continue; | |
374 | ||
d6320ddb | 375 | for (d = 0; d < SPA_DVAS_PER_BP; d++) |
428870ff BB |
376 | dsize += dva_get_dsize_sync(spa, &ddp->ddp_dva[d]); |
377 | ||
378 | dds->dds_blocks += 1; | |
379 | dds->dds_lsize += lsize; | |
380 | dds->dds_psize += psize; | |
381 | dds->dds_dsize += dsize; | |
382 | ||
383 | dds->dds_ref_blocks += refcnt; | |
384 | dds->dds_ref_lsize += lsize * refcnt; | |
385 | dds->dds_ref_psize += psize * refcnt; | |
386 | dds->dds_ref_dsize += dsize * refcnt; | |
387 | } | |
388 | } | |
389 | ||
390 | void | |
391 | ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg) | |
392 | { | |
393 | const uint64_t *s = (const uint64_t *)src; | |
394 | uint64_t *d = (uint64_t *)dst; | |
395 | uint64_t *d_end = (uint64_t *)(dst + 1); | |
396 | ||
397 | ASSERT(neg == 0 || neg == -1ULL); /* add or subtract */ | |
398 | ||
399 | while (d < d_end) | |
400 | *d++ += (*s++ ^ neg) - neg; | |
401 | } | |
402 | ||
403 | static void | |
404 | ddt_stat_update(ddt_t *ddt, ddt_entry_t *dde, uint64_t neg) | |
405 | { | |
406 | ddt_stat_t dds; | |
407 | ddt_histogram_t *ddh; | |
408 | int bucket; | |
409 | ||
410 | ddt_stat_generate(ddt, dde, &dds); | |
411 | ||
412 | bucket = highbit(dds.dds_ref_blocks) - 1; | |
413 | ASSERT(bucket >= 0); | |
414 | ||
415 | ddh = &ddt->ddt_histogram[dde->dde_type][dde->dde_class]; | |
416 | ||
417 | ddt_stat_add(&ddh->ddh_stat[bucket], &dds, neg); | |
418 | } | |
419 | ||
420 | void | |
421 | ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src) | |
422 | { | |
d6320ddb BB |
423 | int h; |
424 | ||
425 | for (h = 0; h < 64; h++) | |
428870ff BB |
426 | ddt_stat_add(&dst->ddh_stat[h], &src->ddh_stat[h], 0); |
427 | } | |
428 | ||
429 | void | |
430 | ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh) | |
431 | { | |
d6320ddb BB |
432 | int h; |
433 | ||
428870ff BB |
434 | bzero(dds, sizeof (*dds)); |
435 | ||
d6320ddb | 436 | for (h = 0; h < 64; h++) |
428870ff BB |
437 | ddt_stat_add(dds, &ddh->ddh_stat[h], 0); |
438 | } | |
439 | ||
440 | boolean_t | |
441 | ddt_histogram_empty(const ddt_histogram_t *ddh) | |
442 | { | |
443 | const uint64_t *s = (const uint64_t *)ddh; | |
444 | const uint64_t *s_end = (const uint64_t *)(ddh + 1); | |
445 | ||
446 | while (s < s_end) | |
447 | if (*s++ != 0) | |
448 | return (B_FALSE); | |
449 | ||
450 | return (B_TRUE); | |
451 | } | |
452 | ||
453 | void | |
454 | ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo_total) | |
455 | { | |
d6320ddb BB |
456 | enum zio_checksum c; |
457 | enum ddt_type type; | |
458 | enum ddt_class class; | |
459 | ||
428870ff | 460 | /* Sum the statistics we cached in ddt_object_sync(). */ |
d6320ddb | 461 | for (c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff | 462 | ddt_t *ddt = spa->spa_ddt[c]; |
d6320ddb BB |
463 | for (type = 0; type < DDT_TYPES; type++) { |
464 | for (class = 0; class < DDT_CLASSES; | |
428870ff BB |
465 | class++) { |
466 | ddt_object_t *ddo = | |
467 | &ddt->ddt_object_stats[type][class]; | |
468 | ddo_total->ddo_count += ddo->ddo_count; | |
469 | ddo_total->ddo_dspace += ddo->ddo_dspace; | |
470 | ddo_total->ddo_mspace += ddo->ddo_mspace; | |
471 | } | |
472 | } | |
473 | } | |
474 | ||
475 | /* ... and compute the averages. */ | |
476 | if (ddo_total->ddo_count != 0) { | |
477 | ddo_total->ddo_dspace /= ddo_total->ddo_count; | |
478 | ddo_total->ddo_mspace /= ddo_total->ddo_count; | |
428870ff BB |
479 | } |
480 | } | |
481 | ||
482 | void | |
483 | ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh) | |
484 | { | |
d6320ddb BB |
485 | enum zio_checksum c; |
486 | enum ddt_type type; | |
487 | enum ddt_class class; | |
488 | ||
489 | for (c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { | |
428870ff | 490 | ddt_t *ddt = spa->spa_ddt[c]; |
d6320ddb BB |
491 | for (type = 0; type < DDT_TYPES; type++) { |
492 | for (class = 0; class < DDT_CLASSES; | |
428870ff BB |
493 | class++) { |
494 | ddt_histogram_add(ddh, | |
495 | &ddt->ddt_histogram_cache[type][class]); | |
496 | } | |
497 | } | |
498 | } | |
499 | } | |
500 | ||
501 | void | |
502 | ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total) | |
503 | { | |
504 | ddt_histogram_t *ddh_total; | |
505 | ||
00b46022 | 506 | /* XXX: Move to a slab */ |
428870ff BB |
507 | ddh_total = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP); |
508 | ddt_get_dedup_histogram(spa, ddh_total); | |
509 | ddt_histogram_stat(dds_total, ddh_total); | |
510 | kmem_free(ddh_total, sizeof (ddt_histogram_t)); | |
511 | } | |
512 | ||
513 | uint64_t | |
514 | ddt_get_dedup_dspace(spa_t *spa) | |
515 | { | |
516 | ddt_stat_t dds_total = { 0 }; | |
517 | ||
518 | ddt_get_dedup_stats(spa, &dds_total); | |
519 | return (dds_total.dds_ref_dsize - dds_total.dds_dsize); | |
520 | } | |
521 | ||
522 | uint64_t | |
523 | ddt_get_pool_dedup_ratio(spa_t *spa) | |
524 | { | |
525 | ddt_stat_t dds_total = { 0 }; | |
526 | ||
527 | ddt_get_dedup_stats(spa, &dds_total); | |
528 | if (dds_total.dds_dsize == 0) | |
529 | return (100); | |
530 | ||
531 | return (dds_total.dds_ref_dsize * 100 / dds_total.dds_dsize); | |
532 | } | |
533 | ||
534 | int | |
535 | ddt_ditto_copies_needed(ddt_t *ddt, ddt_entry_t *dde, ddt_phys_t *ddp_willref) | |
536 | { | |
537 | spa_t *spa = ddt->ddt_spa; | |
538 | uint64_t total_refcnt = 0; | |
539 | uint64_t ditto = spa->spa_dedup_ditto; | |
540 | int total_copies = 0; | |
541 | int desired_copies = 0; | |
d6320ddb | 542 | int p; |
428870ff | 543 | |
d6320ddb | 544 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
545 | ddt_phys_t *ddp = &dde->dde_phys[p]; |
546 | zio_t *zio = dde->dde_lead_zio[p]; | |
547 | uint64_t refcnt = ddp->ddp_refcnt; /* committed refs */ | |
548 | if (zio != NULL) | |
549 | refcnt += zio->io_parent_count; /* pending refs */ | |
550 | if (ddp == ddp_willref) | |
551 | refcnt++; /* caller's ref */ | |
552 | if (refcnt != 0) { | |
553 | total_refcnt += refcnt; | |
554 | total_copies += p; | |
555 | } | |
556 | } | |
557 | ||
558 | if (ditto == 0 || ditto > UINT32_MAX) | |
559 | ditto = UINT32_MAX; | |
560 | ||
561 | if (total_refcnt >= 1) | |
562 | desired_copies++; | |
563 | if (total_refcnt >= ditto) | |
564 | desired_copies++; | |
565 | if (total_refcnt >= ditto * ditto) | |
566 | desired_copies++; | |
567 | ||
568 | return (MAX(desired_copies, total_copies) - total_copies); | |
569 | } | |
570 | ||
571 | int | |
572 | ddt_ditto_copies_present(ddt_entry_t *dde) | |
573 | { | |
574 | ddt_phys_t *ddp = &dde->dde_phys[DDT_PHYS_DITTO]; | |
575 | dva_t *dva = ddp->ddp_dva; | |
576 | int copies = 0 - DVA_GET_GANG(dva); | |
d6320ddb | 577 | int d; |
428870ff | 578 | |
d6320ddb | 579 | for (d = 0; d < SPA_DVAS_PER_BP; d++, dva++) |
428870ff BB |
580 | if (DVA_IS_VALID(dva)) |
581 | copies++; | |
582 | ||
583 | ASSERT(copies >= 0 && copies < SPA_DVAS_PER_BP); | |
584 | ||
585 | return (copies); | |
586 | } | |
587 | ||
588 | size_t | |
589 | ddt_compress(void *src, uchar_t *dst, size_t s_len, size_t d_len) | |
590 | { | |
591 | uchar_t *version = dst++; | |
592 | int cpfunc = ZIO_COMPRESS_ZLE; | |
593 | zio_compress_info_t *ci = &zio_compress_table[cpfunc]; | |
594 | size_t c_len; | |
595 | ||
596 | ASSERT(d_len >= s_len + 1); /* no compression plus version byte */ | |
597 | ||
598 | c_len = ci->ci_compress(src, dst, s_len, d_len - 1, ci->ci_level); | |
599 | ||
600 | if (c_len == s_len) { | |
601 | cpfunc = ZIO_COMPRESS_OFF; | |
602 | bcopy(src, dst, s_len); | |
603 | } | |
604 | ||
605 | *version = (ZFS_HOST_BYTEORDER & DDT_COMPRESS_BYTEORDER_MASK) | cpfunc; | |
606 | ||
607 | return (c_len + 1); | |
608 | } | |
609 | ||
610 | void | |
611 | ddt_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len) | |
612 | { | |
613 | uchar_t version = *src++; | |
614 | int cpfunc = version & DDT_COMPRESS_FUNCTION_MASK; | |
615 | zio_compress_info_t *ci = &zio_compress_table[cpfunc]; | |
616 | ||
617 | if (ci->ci_decompress != NULL) | |
618 | (void) ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level); | |
619 | else | |
620 | bcopy(src, dst, d_len); | |
621 | ||
622 | if ((version ^ ZFS_HOST_BYTEORDER) & DDT_COMPRESS_BYTEORDER_MASK) | |
623 | byteswap_uint64_array(dst, d_len); | |
624 | } | |
625 | ||
626 | ddt_t * | |
627 | ddt_select_by_checksum(spa_t *spa, enum zio_checksum c) | |
628 | { | |
629 | return (spa->spa_ddt[c]); | |
630 | } | |
631 | ||
632 | ddt_t * | |
633 | ddt_select(spa_t *spa, const blkptr_t *bp) | |
634 | { | |
635 | return (spa->spa_ddt[BP_GET_CHECKSUM(bp)]); | |
636 | } | |
637 | ||
638 | void | |
639 | ddt_enter(ddt_t *ddt) | |
640 | { | |
641 | mutex_enter(&ddt->ddt_lock); | |
642 | } | |
643 | ||
644 | void | |
645 | ddt_exit(ddt_t *ddt) | |
646 | { | |
647 | mutex_exit(&ddt->ddt_lock); | |
648 | } | |
649 | ||
650 | static ddt_entry_t * | |
651 | ddt_alloc(const ddt_key_t *ddk) | |
652 | { | |
653 | ddt_entry_t *dde; | |
654 | ||
00b46022 | 655 | /* XXX: Move to a slab */ |
428870ff BB |
656 | dde = kmem_zalloc(sizeof (ddt_entry_t), KM_SLEEP); |
657 | cv_init(&dde->dde_cv, NULL, CV_DEFAULT, NULL); | |
658 | ||
659 | dde->dde_key = *ddk; | |
660 | ||
661 | return (dde); | |
662 | } | |
663 | ||
664 | static void | |
665 | ddt_free(ddt_entry_t *dde) | |
666 | { | |
d6320ddb BB |
667 | int p; |
668 | ||
428870ff BB |
669 | ASSERT(!dde->dde_loading); |
670 | ||
d6320ddb | 671 | for (p = 0; p < DDT_PHYS_TYPES; p++) |
428870ff BB |
672 | ASSERT(dde->dde_lead_zio[p] == NULL); |
673 | ||
674 | if (dde->dde_repair_data != NULL) | |
675 | zio_buf_free(dde->dde_repair_data, | |
676 | DDK_GET_PSIZE(&dde->dde_key)); | |
677 | ||
678 | cv_destroy(&dde->dde_cv); | |
679 | kmem_free(dde, sizeof (*dde)); | |
680 | } | |
681 | ||
682 | void | |
683 | ddt_remove(ddt_t *ddt, ddt_entry_t *dde) | |
684 | { | |
685 | ASSERT(MUTEX_HELD(&ddt->ddt_lock)); | |
686 | ||
687 | avl_remove(&ddt->ddt_tree, dde); | |
688 | ddt_free(dde); | |
689 | } | |
690 | ||
691 | ddt_entry_t * | |
692 | ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add) | |
693 | { | |
694 | ddt_entry_t *dde, dde_search; | |
695 | enum ddt_type type; | |
696 | enum ddt_class class; | |
697 | avl_index_t where; | |
698 | int error; | |
699 | ||
700 | ASSERT(MUTEX_HELD(&ddt->ddt_lock)); | |
701 | ||
702 | ddt_key_fill(&dde_search.dde_key, bp); | |
703 | ||
704 | dde = avl_find(&ddt->ddt_tree, &dde_search, &where); | |
705 | if (dde == NULL) { | |
706 | if (!add) | |
707 | return (NULL); | |
708 | dde = ddt_alloc(&dde_search.dde_key); | |
709 | avl_insert(&ddt->ddt_tree, dde, where); | |
710 | } | |
711 | ||
712 | while (dde->dde_loading) | |
713 | cv_wait(&dde->dde_cv, &ddt->ddt_lock); | |
714 | ||
715 | if (dde->dde_loaded) | |
716 | return (dde); | |
717 | ||
718 | dde->dde_loading = B_TRUE; | |
719 | ||
720 | ddt_exit(ddt); | |
721 | ||
722 | error = ENOENT; | |
723 | ||
724 | for (type = 0; type < DDT_TYPES; type++) { | |
725 | for (class = 0; class < DDT_CLASSES; class++) { | |
726 | error = ddt_object_lookup(ddt, type, class, dde); | |
727 | if (error != ENOENT) | |
728 | break; | |
729 | } | |
730 | if (error != ENOENT) | |
731 | break; | |
732 | } | |
733 | ||
734 | ASSERT(error == 0 || error == ENOENT); | |
735 | ||
736 | ddt_enter(ddt); | |
737 | ||
738 | ASSERT(dde->dde_loaded == B_FALSE); | |
739 | ASSERT(dde->dde_loading == B_TRUE); | |
740 | ||
741 | dde->dde_type = type; /* will be DDT_TYPES if no entry found */ | |
742 | dde->dde_class = class; /* will be DDT_CLASSES if no entry found */ | |
743 | dde->dde_loaded = B_TRUE; | |
744 | dde->dde_loading = B_FALSE; | |
745 | ||
746 | if (error == 0) | |
747 | ddt_stat_update(ddt, dde, -1ULL); | |
748 | ||
749 | cv_broadcast(&dde->dde_cv); | |
750 | ||
751 | return (dde); | |
752 | } | |
753 | ||
754 | void | |
755 | ddt_prefetch(spa_t *spa, const blkptr_t *bp) | |
756 | { | |
757 | ddt_t *ddt; | |
758 | ddt_entry_t dde; | |
d6320ddb BB |
759 | enum ddt_type type; |
760 | enum ddt_class class; | |
428870ff | 761 | |
572e2857 | 762 | if (!zfs_dedup_prefetch || bp == NULL || !BP_GET_DEDUP(bp)) |
428870ff BB |
763 | return; |
764 | ||
765 | /* | |
572e2857 BB |
766 | * We only remove the DDT once all tables are empty and only |
767 | * prefetch dedup blocks when there are entries in the DDT. | |
768 | * Thus no locking is required as the DDT can't disappear on us. | |
428870ff BB |
769 | */ |
770 | ddt = ddt_select(spa, bp); | |
771 | ddt_key_fill(&dde.dde_key, bp); | |
772 | ||
d6320ddb BB |
773 | for (type = 0; type < DDT_TYPES; type++) { |
774 | for (class = 0; class < DDT_CLASSES; class++) { | |
428870ff BB |
775 | ddt_object_prefetch(ddt, type, class, &dde); |
776 | } | |
777 | } | |
778 | } | |
779 | ||
780 | int | |
781 | ddt_entry_compare(const void *x1, const void *x2) | |
782 | { | |
783 | const ddt_entry_t *dde1 = x1; | |
784 | const ddt_entry_t *dde2 = x2; | |
785 | const uint64_t *u1 = (const uint64_t *)&dde1->dde_key; | |
786 | const uint64_t *u2 = (const uint64_t *)&dde2->dde_key; | |
d6320ddb | 787 | int i; |
428870ff | 788 | |
d6320ddb | 789 | for (i = 0; i < DDT_KEY_WORDS; i++) { |
428870ff BB |
790 | if (u1[i] < u2[i]) |
791 | return (-1); | |
792 | if (u1[i] > u2[i]) | |
793 | return (1); | |
794 | } | |
795 | ||
796 | return (0); | |
797 | } | |
798 | ||
799 | static ddt_t * | |
800 | ddt_table_alloc(spa_t *spa, enum zio_checksum c) | |
801 | { | |
802 | ddt_t *ddt; | |
803 | ||
00b46022 BB |
804 | /* XXX: Move to a slab */ |
805 | ddt = kmem_zalloc(sizeof (*ddt), KM_SLEEP | KM_NODEBUG); | |
428870ff BB |
806 | |
807 | mutex_init(&ddt->ddt_lock, NULL, MUTEX_DEFAULT, NULL); | |
808 | avl_create(&ddt->ddt_tree, ddt_entry_compare, | |
809 | sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node)); | |
810 | avl_create(&ddt->ddt_repair_tree, ddt_entry_compare, | |
811 | sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node)); | |
812 | ddt->ddt_checksum = c; | |
813 | ddt->ddt_spa = spa; | |
814 | ddt->ddt_os = spa->spa_meta_objset; | |
815 | ||
816 | return (ddt); | |
817 | } | |
818 | ||
819 | static void | |
820 | ddt_table_free(ddt_t *ddt) | |
821 | { | |
822 | ASSERT(avl_numnodes(&ddt->ddt_tree) == 0); | |
823 | ASSERT(avl_numnodes(&ddt->ddt_repair_tree) == 0); | |
824 | avl_destroy(&ddt->ddt_tree); | |
825 | avl_destroy(&ddt->ddt_repair_tree); | |
826 | mutex_destroy(&ddt->ddt_lock); | |
827 | kmem_free(ddt, sizeof (*ddt)); | |
828 | } | |
829 | ||
830 | void | |
831 | ddt_create(spa_t *spa) | |
832 | { | |
d6320ddb BB |
833 | enum zio_checksum c; |
834 | ||
428870ff BB |
835 | spa->spa_dedup_checksum = ZIO_DEDUPCHECKSUM; |
836 | ||
d6320ddb | 837 | for (c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) |
428870ff BB |
838 | spa->spa_ddt[c] = ddt_table_alloc(spa, c); |
839 | } | |
840 | ||
841 | int | |
842 | ddt_load(spa_t *spa) | |
843 | { | |
d6320ddb BB |
844 | enum zio_checksum c; |
845 | enum ddt_type type; | |
846 | enum ddt_class class; | |
428870ff BB |
847 | int error; |
848 | ||
849 | ddt_create(spa); | |
850 | ||
851 | error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
852 | DMU_POOL_DDT_STATS, sizeof (uint64_t), 1, | |
853 | &spa->spa_ddt_stat_object); | |
854 | ||
855 | if (error) | |
856 | return (error == ENOENT ? 0 : error); | |
857 | ||
d6320ddb | 858 | for (c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff | 859 | ddt_t *ddt = spa->spa_ddt[c]; |
d6320ddb BB |
860 | for (type = 0; type < DDT_TYPES; type++) { |
861 | for (class = 0; class < DDT_CLASSES; | |
428870ff BB |
862 | class++) { |
863 | error = ddt_object_load(ddt, type, class); | |
864 | if (error != 0 && error != ENOENT) | |
865 | return (error); | |
866 | } | |
867 | } | |
868 | ||
869 | /* | |
870 | * Seed the cached histograms. | |
871 | */ | |
872 | bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache, | |
873 | sizeof (ddt->ddt_histogram)); | |
874 | } | |
875 | ||
876 | return (0); | |
877 | } | |
878 | ||
879 | void | |
880 | ddt_unload(spa_t *spa) | |
881 | { | |
d6320ddb BB |
882 | enum zio_checksum c; |
883 | ||
884 | for (c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { | |
428870ff BB |
885 | if (spa->spa_ddt[c]) { |
886 | ddt_table_free(spa->spa_ddt[c]); | |
887 | spa->spa_ddt[c] = NULL; | |
888 | } | |
889 | } | |
890 | } | |
891 | ||
892 | boolean_t | |
893 | ddt_class_contains(spa_t *spa, enum ddt_class max_class, const blkptr_t *bp) | |
894 | { | |
895 | ddt_t *ddt; | |
e95b3bdc | 896 | ddt_entry_t *dde; |
d6320ddb BB |
897 | enum ddt_type type; |
898 | enum ddt_class class; | |
428870ff BB |
899 | |
900 | if (!BP_GET_DEDUP(bp)) | |
901 | return (B_FALSE); | |
902 | ||
903 | if (max_class == DDT_CLASS_UNIQUE) | |
904 | return (B_TRUE); | |
905 | ||
906 | ddt = spa->spa_ddt[BP_GET_CHECKSUM(bp)]; | |
e95b3bdc | 907 | dde = kmem_alloc(sizeof(ddt_entry_t), KM_SLEEP); |
428870ff | 908 | |
e95b3bdc | 909 | ddt_key_fill(&(dde->dde_key), bp); |
428870ff | 910 | |
e95b3bdc BB |
911 | for (type = 0; type < DDT_TYPES; type++) { |
912 | for (class = 0; class <= max_class; class++) { | |
913 | if (ddt_object_lookup(ddt, type, class, dde) == 0) { | |
914 | kmem_free(dde, sizeof(ddt_entry_t)); | |
428870ff | 915 | return (B_TRUE); |
e95b3bdc BB |
916 | } |
917 | } | |
918 | } | |
428870ff | 919 | |
e95b3bdc | 920 | kmem_free(dde, sizeof(ddt_entry_t)); |
428870ff BB |
921 | return (B_FALSE); |
922 | } | |
923 | ||
924 | ddt_entry_t * | |
925 | ddt_repair_start(ddt_t *ddt, const blkptr_t *bp) | |
926 | { | |
927 | ddt_key_t ddk; | |
928 | ddt_entry_t *dde; | |
d6320ddb BB |
929 | enum ddt_type type; |
930 | enum ddt_class class; | |
428870ff BB |
931 | |
932 | ddt_key_fill(&ddk, bp); | |
933 | ||
934 | dde = ddt_alloc(&ddk); | |
935 | ||
d6320ddb BB |
936 | for (type = 0; type < DDT_TYPES; type++) { |
937 | for (class = 0; class < DDT_CLASSES; class++) { | |
428870ff BB |
938 | /* |
939 | * We can only do repair if there are multiple copies | |
940 | * of the block. For anything in the UNIQUE class, | |
941 | * there's definitely only one copy, so don't even try. | |
942 | */ | |
943 | if (class != DDT_CLASS_UNIQUE && | |
944 | ddt_object_lookup(ddt, type, class, dde) == 0) | |
945 | return (dde); | |
946 | } | |
947 | } | |
948 | ||
949 | bzero(dde->dde_phys, sizeof (dde->dde_phys)); | |
950 | ||
951 | return (dde); | |
952 | } | |
953 | ||
954 | void | |
955 | ddt_repair_done(ddt_t *ddt, ddt_entry_t *dde) | |
956 | { | |
957 | avl_index_t where; | |
958 | ||
959 | ddt_enter(ddt); | |
960 | ||
961 | if (dde->dde_repair_data != NULL && spa_writeable(ddt->ddt_spa) && | |
962 | avl_find(&ddt->ddt_repair_tree, dde, &where) == NULL) | |
963 | avl_insert(&ddt->ddt_repair_tree, dde, where); | |
964 | else | |
965 | ddt_free(dde); | |
966 | ||
967 | ddt_exit(ddt); | |
968 | } | |
969 | ||
970 | static void | |
971 | ddt_repair_entry_done(zio_t *zio) | |
972 | { | |
973 | ddt_entry_t *rdde = zio->io_private; | |
974 | ||
975 | ddt_free(rdde); | |
976 | } | |
977 | ||
978 | static void | |
979 | ddt_repair_entry(ddt_t *ddt, ddt_entry_t *dde, ddt_entry_t *rdde, zio_t *rio) | |
980 | { | |
981 | ddt_phys_t *ddp = dde->dde_phys; | |
982 | ddt_phys_t *rddp = rdde->dde_phys; | |
983 | ddt_key_t *ddk = &dde->dde_key; | |
984 | ddt_key_t *rddk = &rdde->dde_key; | |
985 | zio_t *zio; | |
986 | blkptr_t blk; | |
d6320ddb | 987 | int p; |
428870ff BB |
988 | |
989 | zio = zio_null(rio, rio->io_spa, NULL, | |
990 | ddt_repair_entry_done, rdde, rio->io_flags); | |
991 | ||
d6320ddb | 992 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++, rddp++) { |
428870ff BB |
993 | if (ddp->ddp_phys_birth == 0 || |
994 | ddp->ddp_phys_birth != rddp->ddp_phys_birth || | |
995 | bcmp(ddp->ddp_dva, rddp->ddp_dva, sizeof (ddp->ddp_dva))) | |
996 | continue; | |
997 | ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk); | |
998 | zio_nowait(zio_rewrite(zio, zio->io_spa, 0, &blk, | |
999 | rdde->dde_repair_data, DDK_GET_PSIZE(rddk), NULL, NULL, | |
1000 | ZIO_PRIORITY_SYNC_WRITE, ZIO_DDT_CHILD_FLAGS(zio), NULL)); | |
1001 | } | |
1002 | ||
1003 | zio_nowait(zio); | |
1004 | } | |
1005 | ||
1006 | static void | |
1007 | ddt_repair_table(ddt_t *ddt, zio_t *rio) | |
1008 | { | |
1009 | spa_t *spa = ddt->ddt_spa; | |
1010 | ddt_entry_t *dde, *rdde_next, *rdde; | |
1011 | avl_tree_t *t = &ddt->ddt_repair_tree; | |
1012 | blkptr_t blk; | |
1013 | ||
1014 | if (spa_sync_pass(spa) > 1) | |
1015 | return; | |
1016 | ||
1017 | ddt_enter(ddt); | |
1018 | for (rdde = avl_first(t); rdde != NULL; rdde = rdde_next) { | |
1019 | rdde_next = AVL_NEXT(t, rdde); | |
1020 | avl_remove(&ddt->ddt_repair_tree, rdde); | |
1021 | ddt_exit(ddt); | |
1022 | ddt_bp_create(ddt->ddt_checksum, &rdde->dde_key, NULL, &blk); | |
1023 | dde = ddt_repair_start(ddt, &blk); | |
1024 | ddt_repair_entry(ddt, dde, rdde, rio); | |
1025 | ddt_repair_done(ddt, dde); | |
1026 | ddt_enter(ddt); | |
1027 | } | |
1028 | ddt_exit(ddt); | |
1029 | } | |
1030 | ||
1031 | static void | |
1032 | ddt_sync_entry(ddt_t *ddt, ddt_entry_t *dde, dmu_tx_t *tx, uint64_t txg) | |
1033 | { | |
1034 | dsl_pool_t *dp = ddt->ddt_spa->spa_dsl_pool; | |
1035 | ddt_phys_t *ddp = dde->dde_phys; | |
1036 | ddt_key_t *ddk = &dde->dde_key; | |
1037 | enum ddt_type otype = dde->dde_type; | |
1038 | enum ddt_type ntype = DDT_TYPE_CURRENT; | |
1039 | enum ddt_class oclass = dde->dde_class; | |
1040 | enum ddt_class nclass; | |
1041 | uint64_t total_refcnt = 0; | |
d6320ddb | 1042 | int p; |
428870ff BB |
1043 | |
1044 | ASSERT(dde->dde_loaded); | |
1045 | ASSERT(!dde->dde_loading); | |
1046 | ||
d6320ddb | 1047 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
1048 | ASSERT(dde->dde_lead_zio[p] == NULL); |
1049 | ASSERT((int64_t)ddp->ddp_refcnt >= 0); | |
1050 | if (ddp->ddp_phys_birth == 0) { | |
1051 | ASSERT(ddp->ddp_refcnt == 0); | |
1052 | continue; | |
1053 | } | |
1054 | if (p == DDT_PHYS_DITTO) { | |
1055 | if (ddt_ditto_copies_needed(ddt, dde, NULL) == 0) | |
1056 | ddt_phys_free(ddt, ddk, ddp, txg); | |
1057 | continue; | |
1058 | } | |
1059 | if (ddp->ddp_refcnt == 0) | |
1060 | ddt_phys_free(ddt, ddk, ddp, txg); | |
1061 | total_refcnt += ddp->ddp_refcnt; | |
1062 | } | |
1063 | ||
1064 | if (dde->dde_phys[DDT_PHYS_DITTO].ddp_phys_birth != 0) | |
1065 | nclass = DDT_CLASS_DITTO; | |
1066 | else if (total_refcnt > 1) | |
1067 | nclass = DDT_CLASS_DUPLICATE; | |
1068 | else | |
1069 | nclass = DDT_CLASS_UNIQUE; | |
1070 | ||
1071 | if (otype != DDT_TYPES && | |
1072 | (otype != ntype || oclass != nclass || total_refcnt == 0)) { | |
1073 | VERIFY(ddt_object_remove(ddt, otype, oclass, dde, tx) == 0); | |
1074 | ASSERT(ddt_object_lookup(ddt, otype, oclass, dde) == ENOENT); | |
1075 | } | |
1076 | ||
1077 | if (total_refcnt != 0) { | |
1078 | dde->dde_type = ntype; | |
1079 | dde->dde_class = nclass; | |
1080 | ddt_stat_update(ddt, dde, 0); | |
1081 | if (!ddt_object_exists(ddt, ntype, nclass)) | |
1082 | ddt_object_create(ddt, ntype, nclass, tx); | |
1083 | VERIFY(ddt_object_update(ddt, ntype, nclass, dde, tx) == 0); | |
1084 | ||
1085 | /* | |
1086 | * If the class changes, the order that we scan this bp | |
1087 | * changes. If it decreases, we could miss it, so | |
1088 | * scan it right now. (This covers both class changing | |
1089 | * while we are doing ddt_walk(), and when we are | |
1090 | * traversing.) | |
1091 | */ | |
1092 | if (nclass < oclass) { | |
1093 | dsl_scan_ddt_entry(dp->dp_scan, | |
1094 | ddt->ddt_checksum, dde, tx); | |
1095 | } | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | static void | |
1100 | ddt_sync_table(ddt_t *ddt, dmu_tx_t *tx, uint64_t txg) | |
1101 | { | |
1102 | spa_t *spa = ddt->ddt_spa; | |
1103 | ddt_entry_t *dde; | |
1104 | void *cookie = NULL; | |
d6320ddb BB |
1105 | enum ddt_type type; |
1106 | enum ddt_class class; | |
428870ff BB |
1107 | |
1108 | if (avl_numnodes(&ddt->ddt_tree) == 0) | |
1109 | return; | |
1110 | ||
1111 | ASSERT(spa->spa_uberblock.ub_version >= SPA_VERSION_DEDUP); | |
1112 | ||
1113 | if (spa->spa_ddt_stat_object == 0) { | |
1114 | spa->spa_ddt_stat_object = zap_create(ddt->ddt_os, | |
1115 | DMU_OT_DDT_STATS, DMU_OT_NONE, 0, tx); | |
1116 | VERIFY(zap_add(ddt->ddt_os, DMU_POOL_DIRECTORY_OBJECT, | |
1117 | DMU_POOL_DDT_STATS, sizeof (uint64_t), 1, | |
1118 | &spa->spa_ddt_stat_object, tx) == 0); | |
1119 | } | |
1120 | ||
1121 | while ((dde = avl_destroy_nodes(&ddt->ddt_tree, &cookie)) != NULL) { | |
1122 | ddt_sync_entry(ddt, dde, tx, txg); | |
1123 | ddt_free(dde); | |
1124 | } | |
1125 | ||
d6320ddb | 1126 | for (type = 0; type < DDT_TYPES; type++) { |
572e2857 | 1127 | uint64_t count = 0; |
d6320ddb | 1128 | for (class = 0; class < DDT_CLASSES; class++) { |
572e2857 BB |
1129 | if (ddt_object_exists(ddt, type, class)) { |
1130 | ddt_object_sync(ddt, type, class, tx); | |
1131 | count += ddt_object_count(ddt, type, class); | |
1132 | } | |
1133 | } | |
d6320ddb | 1134 | for (class = 0; class < DDT_CLASSES; class++) { |
572e2857 | 1135 | if (count == 0 && ddt_object_exists(ddt, type, class)) |
428870ff BB |
1136 | ddt_object_destroy(ddt, type, class, tx); |
1137 | } | |
1138 | } | |
1139 | ||
1140 | bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache, | |
1141 | sizeof (ddt->ddt_histogram)); | |
1142 | } | |
1143 | ||
1144 | void | |
1145 | ddt_sync(spa_t *spa, uint64_t txg) | |
1146 | { | |
1147 | dmu_tx_t *tx; | |
1148 | zio_t *rio = zio_root(spa, NULL, NULL, | |
1149 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE); | |
d6320ddb | 1150 | enum zio_checksum c; |
428870ff BB |
1151 | |
1152 | ASSERT(spa_syncing_txg(spa) == txg); | |
1153 | ||
1154 | tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); | |
1155 | ||
d6320ddb | 1156 | for (c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff BB |
1157 | ddt_t *ddt = spa->spa_ddt[c]; |
1158 | if (ddt == NULL) | |
1159 | continue; | |
1160 | ddt_sync_table(ddt, tx, txg); | |
1161 | ddt_repair_table(ddt, rio); | |
1162 | } | |
1163 | ||
1164 | (void) zio_wait(rio); | |
1165 | ||
1166 | dmu_tx_commit(tx); | |
1167 | } | |
1168 | ||
1169 | int | |
1170 | ddt_walk(spa_t *spa, ddt_bookmark_t *ddb, ddt_entry_t *dde) | |
1171 | { | |
1172 | do { | |
1173 | do { | |
1174 | do { | |
1175 | ddt_t *ddt = spa->spa_ddt[ddb->ddb_checksum]; | |
1176 | int error = ENOENT; | |
1177 | if (ddt_object_exists(ddt, ddb->ddb_type, | |
1178 | ddb->ddb_class)) { | |
1179 | error = ddt_object_walk(ddt, | |
1180 | ddb->ddb_type, ddb->ddb_class, | |
1181 | &ddb->ddb_cursor, dde); | |
1182 | } | |
1183 | dde->dde_type = ddb->ddb_type; | |
1184 | dde->dde_class = ddb->ddb_class; | |
1185 | if (error == 0) | |
1186 | return (0); | |
1187 | if (error != ENOENT) | |
1188 | return (error); | |
1189 | ddb->ddb_cursor = 0; | |
1190 | } while (++ddb->ddb_checksum < ZIO_CHECKSUM_FUNCTIONS); | |
1191 | ddb->ddb_checksum = 0; | |
1192 | } while (++ddb->ddb_type < DDT_TYPES); | |
1193 | ddb->ddb_type = 0; | |
1194 | } while (++ddb->ddb_class < DDT_CLASSES); | |
1195 | ||
1196 | return (ENOENT); | |
1197 | } | |
c409e464 BB |
1198 | |
1199 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
1200 | module_param(zfs_dedup_prefetch, int, 0644); | |
1201 | MODULE_PARM_DESC(zfs_dedup_prefetch,"Enable prefetching dedup-ed blks"); | |
1202 | #endif |